{"id":49588,"date":"2022-08-14T14:02:56","date_gmt":"2022-08-14T14:02:56","guid":{"rendered":"https:\/\/www.takomabattery.com\/?p=49588"},"modified":"2023-11-17T09:30:28","modified_gmt":"2023-11-17T09:30:28","slug":"cause-analysis-of-undercapacity-of-battery-cell","status":"publish","type":"post","link":"https:\/\/www.takomabattery.com\/fr\/cause-analysis-of-undercapacity-of-battery-cell\/","title":{"rendered":"Analyse des causes de la sous-capacit\u00e9 des cellules de batterie"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"49588\" class=\"elementor elementor-49588\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-46bcce6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"46bcce6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4c5dd0d\" data-id=\"4c5dd0d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-000e54c elementor-widget elementor-widget-woocommerce-breadcrumb\" data-id=\"000e54c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"woocommerce-breadcrumb.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<nav class=\"woocommerce-breadcrumb\" aria-label=\"Breadcrumb\">Accueil<\/nav>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d51e45 elementor-widget elementor-widget-heading\" data-id=\"5d51e45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Cause analysis of undercapacity of battery cell<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f576337 elementor-widget elementor-widget-text-editor\" data-id=\"f576337\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"line-height: 40px\">Capacity is the first attribute of batteries, and undercapacity of battery cell is also a problem often encountered in samples and mass production. This paper mainly analyzes the problem of uncapacity of cells.<\/div><div>\u00a0<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3070ace elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"3070ace\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;exclude_headings_by_selector&quot;:&quot;.paichu_post&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<div class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__3070ace\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__3070ace\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__3070ace\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7838c62 uael-aspect-ratio-16_9 uael-youtube-subscribe-no elementor-widget elementor-widget-uael-video\" data-id=\"7838c62\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"uael-video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"uael-video__outer-wrap  uael-video-type-youtube\" data-device=\"false\" data-vsticky=\"no\" data-hidedesktop=\"\" data-hidetablet=\"\" data-hidemobile=\"\" data-vsticky-viewport=\"0\" data-autoplay=\"0\">\n\t\t\t\t\t\t<div class=\"uael-video-inner-wrap\">\n\t\t\t\t<div class=\"uael-video__play\" data-src=\"https:\/\/www.youtube.com\/embed\/4AQp3WqKtsc?rel=0&amp;start&amp;end&amp;controls=1&amp;mute=0&amp;modestbranding=0&amp;autoplay=1\">\n\t\t\t\t\t<img decoding=\"async\" class=\"uael-video__thumb\" src=\"https:\/\/i.ytimg.com\/vi\/4AQp3WqKtsc\/hqdefault.jpg\" alt=\"\"><\/img>\n\t\t\t\t\t<div class=\"uael-video__play-icon uael-animation-\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2023\/07\/YouTube_play_button_icon_2013\u20132017.svg-21.webp\" alt=\"youtube play button\" \/>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-548aa6d elementor-widget elementor-widget-text-editor\" data-id=\"548aa6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"line-height: 40px\"><h2 id=\"What_causes_undercapacity_of_battery_cell?\">What causes undercapacity of battery cell?<\/h2><p>Hearing of undercapacity of battery cell, the first reaction should be to confirm whether the undercapacity problem is true. Simply, first to confirm whether the capacitor process is set wrong, such as the discharge current is large, the charging time with <span style=\"text-decoration: underline;color: #333399\"><a style=\"color: #333399;text-decoration: underline\" href=\"https:\/\/www.takomabattery.com\/best-guide-for-choosing-a-perfect-lithium-battery-charger\/\" target=\"_blank\" rel=\"noopener\">battery charger<\/a><\/span> is short. If the capacitor step setting is no problem, it is necessary to divide the cell after replacing the test point. Of course, for mass production and even samples, the probability of undercapacity caused by the capacity separation cabinet error is very low, and generally the cell really has a problem.<\/p><p>If the low capacity is still low after the retest, it can confirm that the undercapacity problem really exists. After confirming the existence of undercapacity of battery cell, it is necessary to further confirm the frequency and severity of undercapacity, and grasp the actual situation of undercapacity on the whole. Samples are often a batch, but the production model is &#8220;the model has been undercapacity&#8221; and &#8220;the model occasionally undercapacity&#8221; these two situations. For the former, the analysis should take the design, material selection perspective and mass production as the entry point and priority direction.<\/p><p>For the latter, the production line operation and process change as the priority object. After the frequency is confirmed, but also to confirm the relatively unimportant severity, which is the proportion of undercapacity of battery cell and the proportion of capacity below the required value. Confirmation of severity is more likely to provide the basis for the possible easing of capacity specifications and determining the shortage of stock, and the analysis of the problem itself is not as important as the frequency of confirmation, but it is still essential.<\/p><p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-49619\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/What-causes-undercapacity-of-battery-cell.jpg\" alt=\"What causes undercapacity of battery cell\" width=\"1000\" height=\"625\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/What-causes-undercapacity-of-battery-cell.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/What-causes-undercapacity-of-battery-cell-300x188.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/What-causes-undercapacity-of-battery-cell-768x480.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/What-causes-undercapacity-of-battery-cell-600x375.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>After grasping the actual situation of undercapacity as a whole, it is necessary to start the analysis. For experts with a high level who have encountered the same problem, removing the 3pcs battery should be able to roughly determine the actual cause of the undercapacity of battery cell. But for the average person, a more systematic approach is required. Before the analysis of the system, you can disassemble the undercapacity of battery cell that was re-measured and fully charged before and look at the interface.<\/p><p>If there is no problem, it is likely because the cathode coating is too light or the design margin is insufficient. If there is a problem with the interface, it may be a problem in the process or in the design. First of all, you need at least 8pcs cells with undercacity + 8pcs cells with qualified capacity. The undercapacity cells are then randomly divided into two groups, the undercapacity group A and the undercapacity group B, and the qualified cells are randomly divided into two groups, the qualified group A and the qualified group B.<\/p><p>Then discharge the two A-group cells to a static voltage of about 3.0V. Then disassemble the undercapacity and qualified cells, vacuum bake the cathode electrode sheet at a temperature above 85\u00b0C for 24 hours, and then weigh the undercapacity cathode electrode sheet and the qualified cathode electrode. If the weight of the undercapacity electrode is significantly lower than the qualified cathode electrode or lower than the process range, it can basically be judged that the undercapacity of battery cell is caused by the light coating of the cathode electrode.<\/p><p>First, although the first irreversible lithium source of the cathode electrode will cause the cathode electrode to lose a little weight, the weight of the total irreversible lithium source only accounts for about 5% of the cathode electrode lithium source and less than 0.5% of the weight of the cathode electrode sheet. The irreversible lithium source caused by the light source of the cathode electrode will not be less than 1% of the total weight of the pole piece.<\/p><p>The electrolyte cannot be completely dried during the baking process, but the weight of the actual residual part is limited relative to the weight of the polar plate. Overall, the weight of the weighing pole plate after baking the cathode electrode is not more than 2% in error compared with the actual weight of the coil front electrode plate. Moreover, there is a capacity of qualified cathode electrode weight and undercapacity electrode sheet weight relative ratio.<\/p><p><img decoding=\"async\" class=\"aligncenter size-full wp-image-49620\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Cells-with-undercacity-VS-Cells-with-qualified-capacity.jpg\" alt=\"Cells with undercacity VS Cells with qualified capacity\" width=\"1000\" height=\"520\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Cells-with-undercacity-VS-Cells-with-qualified-capacity.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Cells-with-undercacity-VS-Cells-with-qualified-capacity-300x156.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Cells-with-undercacity-VS-Cells-with-qualified-capacity-768x399.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Cells-with-undercacity-VS-Cells-with-qualified-capacity-600x312.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>Second, the same method is not suitable for the anode electrode, because the anode electrode will increase a lot of weight, but we can give the anode electrode weight increase ratio after the experiment and then reverse the weight of the anode electrode piece, and judge whether the underapacity of battery cell is caused by the anode electrode excess.<\/p><p>If it is confirmed that the reason why the cathode electrode is too light is the undercapacity, it will be lucky, but in fact, the probability of this luck is often just in case. In this case, it depends on the analysis of the undercapacity group B and the qualified group B. Group B cells need to be fully charged, and then disassembled to compare the differences in the anode interface. Low discharge capacity low equivalent to low charging capacity equivalent to the anode electrode full charging interface will be abnormal.<\/p><p>In fact, in most cases, as long as undercapacity occurs, no matter whether the cell is undercapacity or qualified, the interface will have similar abnormalities, but the degree is different. When recording the interface condition of the cell, it is also necessary to record the actual capacity of the corresponding cell at the same time. In the end, it is generally similar to the conclusion that the interface abnormality of the cell with undercapacitance and high degree is more serious.<\/p><h2 id=\"Reasons_for_undercapacity_of_battery_cell:_battery_design\">Reasons for undercapacity of battery cell: battery design<\/h2><p>The reasons for the undercapacity can be divided into two directions: the design and process of a battery. The matching of materials, especially the matching of the anode electrode and the electrolyte, has a particularly significant impact on the capacity of the cell. For a new anode electrode or a new electrolyte, if repeating the test finds that every time the cell will precipitate lithium and have a undercapacity, there is a high possibility that the materials themselves do not match.<\/p><p>The reason for the mismatch may be that the SEI film formed during the formation is not dense enough, too thick or unstable, or it may be that the PC in the electrolyte peels off the graphite layer. It is also not ruled out that the surface density of its own design is too large to cause the battery cell to be unable to adapt to high-rate charge and discharge.<\/p><p>The separator is also a factor that may cause undercapacity. For the use of a single-layer PP low-cost separator, the hand-wound cell separator will be wrinkled in the longitudinal direction of the middle position of each layer, and the negative electrode will not be fully inserted in the wrinkled place and affects the battery capacity.<\/p><p>Insufficient capacity design margin will also cause undercapacity. Due to the cathode and anode coating, the error of the sub-container and the influence of the glue on the capacity, a certain capacity margin must be left in the design. When designing the capacity margin, you can either calculate the capacity of the cells in all processes that are exactly the center line and then leave the margin, or you can calculate the margin after all the factors that affect the capacity have occurred below the limit. For new materials, accurate evaluation of the gram performance of the cathode under this system is important.<\/p><p><img decoding=\"async\" class=\"aligncenter size-full wp-image-49621\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Reasons-for-undercapacity-of-battery-cell-battery-design.jpg\" alt=\"Reasons for undercapacity of battery cell - battery design\" width=\"1000\" height=\"473\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Reasons-for-undercapacity-of-battery-cell-battery-design.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Reasons-for-undercapacity-of-battery-cell-battery-design-300x142.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Reasons-for-undercapacity-of-battery-cell-battery-design-768x363.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Reasons-for-undercapacity-of-battery-cell-battery-design-600x284.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>The capacity ratio, charge cut-off current, charge and discharge rate, and the type of electrolyte will all affect the performance of the cathode electrode. If the design value of the cathode electrode is artificially increased in order to achieve the target capacity, it is equivalent to insufficient design capacity. There is no problem with the interface of the battery, and there is no problem with the entire process data, but the battery is undercapacity. Therefore, new materials must pay attention to evaluating the accurate performance of the cathode electrode.<\/p><p>Not the same cathode electrode has the same performance when matched with any anode electrode and electrolyte. Excessive anode electrode will also affect the performance of the cathode electrode to a certain extent, which in turn affects the capacity of the cell. Continue to increase the excess anode electrode at the lower limit of the excess anode electrode without lithium precipitation, and the performance of the cathode electrode will increase by about 1% to 2%.<\/p><p>Of course, even if it is increased, the larger the design capacity output, the better, the excess anode electrode is still as long as guaranteed that lithium can not be precipitated. When the excess of the anode electrode is too high, the gram performance of the cathode electrode will decrease again, because more irreversible lithium is required for formation. Of course, the probability of this happening is almost non-existent.<\/p><p>When the liquid injection volume is low, the corresponding liquid retention volume will also decrease. When the liquid retention volume of the battery cell is too small, the effect of lithium ion intercalation and deintercalation in the cathode and anode electrodes will be affected, resulting in low capacity. Although the cost and process will have less pressure after reducing the liquid injection amount, the premise of reducing the liquid injection amount must be that it does not affect the performance of the cell.<\/p><p>Of course, reducing the liquid injection volume will only increase the probability of undecapacity of battery cell caused by insufficient liquid retention in the battery cell, not an inevitable result. At the same time, the more difficult the model is to absorb liquid, the excess electrolyte should be more, so as to ensure better contact with the pole piece during the electrolyte infiltration.<\/p><p>When the liquid retention capacity of the battery cell is insufficient, the cathode and anode electrode sheets will be relatively dry, and a thin layer of lithium deposition will occur on the anode electrode. This point can be used as a factor for the low capacity caused by the poor liquid retention capacity.<\/p><h2 id=\"Analysis_of_undercapacity_of_battery_cell:_battery_manufacturing_process\">Analysis of undercapacity of battery cell: battery manufacturing process<\/h2><p>If the design experience or past batches have determined that the design will not cause the undercapacity, then the process exception is very questionable. The light coating of the cathode or anode electrode can directly cause the undercapacity of battery cell. When the coating of the cathode electrode is light, the interface of the fully charged cell will not be abnormal. At this time, it is necessary to measure the weight of the cathode electrode sheet by baking to determine the problem.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-49622\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Analysis-of-undercapacity-of-battery-cell-battery-manufacturing-process.jpg\" alt=\"Analysis of undercapacity of battery cell - battery manufacturing process\" width=\"1000\" height=\"749\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Analysis-of-undercapacity-of-battery-cell-battery-manufacturing-process.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Analysis-of-undercapacity-of-battery-cell-battery-manufacturing-process-300x225.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Analysis-of-undercapacity-of-battery-cell-battery-manufacturing-process-768x575.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Analysis-of-undercapacity-of-battery-cell-battery-manufacturing-process-600x449.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>The anode electrode acts as a lithium ion acceptor, and the number of lithium intercalation sites it can provide must be greater than the number of lithium sources provided by the cathode electrode, otherwise excess lithium will be precipitated on the surface of the anode electrode, thereby forming a thin layer of relatively uniform lithium precipitation.<\/p><p>As mentioned above, because the weight of the anode electrode sheet can not directly remove the baking weight of the pole sheet, so one is another experiment can be done to find the anode weight increase ratio to remove the baking weight of the anode plate through the core of the coating weight, the other is that it can compare the undercapacity and qualified battery or <span style=\"text-decoration: underline;color: #333399\"><a style=\"color: #333399;text-decoration: underline\" href=\"https:\/\/www.takomabattery.com\/what-is-ternary-lithium-battery\/\" target=\"_blank\" rel=\"noopener\">ternary lithium battery<\/a><\/span> and not analyze the anode weight of the lithium battery cell.<\/p><p>If the relative weight of the anode electrode of qualified cells is heavy and at the same time, a thin layer of anode electrode precipitation lithium of the anode electrode, the possibility of insufficient anode electrode is very large. In addition, coating the yin and yang sides of the cathode electrode or the anode electrode will also cause undercapacity, and among them, the anode electrode is mainly coated with light on one side, because even if the cathode electrode is coated heavily, although the gram performance will decrease, the total capacity will not decrease.<\/p><p>On the contrary, it may even increase. If the anode electrode process is dislocation coating, directly compare the relative weight ratio of the single and double sides after baking, as long as the data similar to the A side is 6% lighter than the B side coating, the problem can be basically concluded. Of course, if the problem of undercapacity is very serious, and it is necessary to further reverse the actual areal density of the A\/B surface.<\/p><p>Rolling damages the structure of the material, which in turn affects capacity. The reason why a material has properties such as capacity, voltage, etc., its molecular or atomic structure is the fundamental reason. When the rolling density of the cathode electrode exceeds the technical value, the cathode electrode sheet will be very bright after the cell is disassembled.<\/p><p>If the cathode electrode is compacted too much, the cathode electrode piece will be easily broken after winding, which will also cause undercapacity. However, since the cathode electrode crushing will cause the pole piece to break as soon as it is folded, and the cathode electrode rolling itself requires a lot of pressure, the frequency of the cathode electrode crushing will be much lower than that of the anode electrode crushing.<\/p><p>When the anode electrode is crushed to death, strips or blocks of lithium precipitation will form on the surface of the anode electrode, and the liquid retention of the battery cell will be significantly reduced. When the compaction is further increased, the bulk area of lithium precipitation increases, and the amount of lithium precipitation also increases, and the two colors of platinum on the surface of the cell are distinct and dry.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-49623\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Excessive-water-content-in-the-water-electrode-sheet-will-also-cause-undercapacity.jpg\" alt=\"Excessive water content in the water electrode sheet will also cause undercapacity\" width=\"1000\" height=\"625\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Excessive-water-content-in-the-water-electrode-sheet-will-also-cause-undercapacity.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Excessive-water-content-in-the-water-electrode-sheet-will-also-cause-undercapacity-300x188.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Excessive-water-content-in-the-water-electrode-sheet-will-also-cause-undercapacity-768x480.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/08\/Excessive-water-content-in-the-water-electrode-sheet-will-also-cause-undercapacity-600x375.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>Excessive water content can also cause undercapacity of battery cell. When the water content of the water electrode sheet exceeds the standard before the battery is injected, the dew point of the glove box is unqualified, the water content of the electrolyte exceeds the standard, and the second degassing seal introduces moisture, the battery may have a undercapacity.<\/p><p>A trace amount of moisture is required when the cell is formed, but when the moisture exceeds a certain value, the excess moisture will destroy the SEI film and consume the lithium salt in the electrolyte, thereby reducing the capacity of the cell. Battery cells with excessive water content are dark brown in small pieces when they are fully charged and negatively charged.<\/p><h2 id=\"Conclusion\">Conclusion<\/h2><p>Analysis of undercapacity of battery cell, if it is confident can dismantle a few bad appearance cells can basic confirmation problem, if the undercapacity caused volume loss need detailed report, or undercapacity reason is never seen before, you need to steadfast from collecting process data, compare undercapacity and qualified cells, improvement scheme for detailed analysis.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b1308f elementor-widget elementor-widget-heading\" data-id=\"1b1308f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-heading-title elementor-size-large\">Related 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Table des mati\u00e8res https:\/\/www.youtube.com\/watch?v=4AQp3WqKtsc Quelles sont les causes de la sous-capacit\u00e9 des \u00e9l\u00e9ments de batterie ? Audition de la sous-capacit\u00e9 de la batterie<\/p>","protected":false},"author":1,"featured_media":49617,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[210,1,211],"tags":[7,117,130,153],"class_list":["post-49588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-battery-industry","category-battery-materials","category-lithium-battery-technology","tag-battery","tag-battery-cell","tag-lithium-battery","tag-lithium-ion-battery"],"modified_by":"tycorun666","_links":{"self":[{"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/posts\/49588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/comments?post=49588"}],"version-history":[{"count":0,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/posts\/49588\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/media\/49617"}],"wp:attachment":[{"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/media?parent=49588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/categories?post=49588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.takomabattery.com\/fr\/wp-json\/wp\/v2\/tags?post=49588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}