Battery cell and battery

Abstract

The utility model discloses a battery cell and battery, the battery cell comprises a first electrode and an insulating coating, the first electrode comprises a first current collector and a first active coating, and the first active coating is coated on the first current collector. The insulating coating is arranged on the side, away from the first current collector, of the first active coating, and the insulating coating is configured to have electrical insulation performance. A first groove is formed in the side, away from the first current collector, of the first active coating, so that when the first active coating is coated with the insulating coating, at least part of the insulating coating can be filled in the first groove. The arrangement of the insulating coating makes the utilization rate of the internal space of the battery higher, so that the capacity of the battery is improved. And when the internal circulation of the battery cell generates expansion and causes the volume change of the first active coating, the probability that the insulating coating is separated from the first active coating is reduced, so that the safety performance of the battery is improved, and the probability that the performance of the battery is deteriorated is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core and a battery. Background Art

[0002] The existing battery structure consists of a positive electrode, a separator, a negative electrode, and a separator wound or stacked in sequence. The assembly process requires the positive electrode, negative electrode, and separator to have a specific alignment structure, and high processing consistency requirements are placed on the electrodes and separator. As the demand for battery energy density increases, existing technologies have reduced the number of battery cells in the battery pack by increasing battery capacity, thereby reducing the amount of battery casing required. However, increasing battery capacity easily increases the size of the individual cells, which in turn increases the corresponding internal cyclic expansion stress, resulting in significant safety risks for the battery. Therefore, there is an urgent need to provide a battery that can increase battery capacity while ensuring battery safety. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery cell and a battery, aiming to solve the technical problem of how to ensure battery safety while increasing battery capacity.

[0004] To achieve the above objectives, the present invention provides a battery cell comprising:

[0005] A first electrode includes a first current collector and a first active coating, wherein the first current collector includes a first region and a second region adjacently distributed along a first direction, the first active coating is applied to the first region, and the second region is suitable for electrically connecting to a tab;

[0006] an insulating coating layer, disposed on a side of the first active coating layer facing away from the first current collector, the insulating coating layer being configured to have electrical insulation properties;

[0007] A first groove is provided on a side of the first active coating layer facing away from the first current collector, so that the insulating coating layer fills the first groove.

[0008] In some embodiments, a dimension D1 of the insulating coating in the first direction and a dimension L1 of the first active coating in the first direction satisfy 0 mm ≤ D1 - L1 ≤ 5 mm.

[0009] In some embodiments, a side of the first active coating layer facing away from the second region is aligned with a side of the first region facing away from the second region.

[0010] In some embodiments, a dimension D2 of the insulating coating in the second direction and a dimension L2 of the first active coating in the second direction satisfy 0mm≤D2-L2≤5mm, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the direction of the first active coating pointing to the first current collector.

[0011] In some embodiments, the battery cell further includes a second electrode, the second electrode including a second current collector and a second active coating coated on the second current collector, and the second electrode is located on a side of the insulating coating facing away from the first electrode.

[0012] In some embodiments, the first electrode is configured as a negative electrode sheet, the second electrode is configured as a positive electrode sheet, a second groove is provided on the side of the second active coating facing away from the second current collector, and when the first electrode is combined with the second electrode, the insulating coating is configured to be able to be applied to the second groove so that the insulating coating is fixed to the second electrode.

[0013] In some embodiments, a dimension M1 of the second active coating in the first direction and a dimension L1 of the first active coating in the first direction satisfy: 2 mm ≤ L1 − M1 ≤ 5 mm.

[0014] In some embodiments, the first current collector is provided with the first active coating on both sides opposite to each other along a third direction, the third direction is parallel to the direction of the first active coating pointing to the first current collector, and the second current collector is provided with the second active coating on both sides opposite to each other along the third direction.

[0015] In some embodiments, the battery cell further includes a functional component, and the functional component is configured to be able to fill the first groove and adhere to the insulating coating and the first active coating.

[0016] A second aspect of the present invention further provides a battery, comprising:

[0017] The battery cell described in any one of the above embodiments; and

[0018] The housing has a housing space configured to accommodate the battery cell.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In the technical solution of the present invention, the battery cell includes a first electrode and an insulating coating, wherein the first electrode includes a first current collector and a first active coating, and the first active coating is applied to the first current collector. The insulating coating is arranged on the side of the first active coating facing away from the first current collector, and the insulating coating is configured to have electrical insulation properties. A first groove is provided on the side of the first active coating facing away from the first current collector, so that when the insulating coating is applied to the first active coating, at least part of the insulating coating can be filled in the first groove. When the battery cell circulates internally and expands, causing the volume of the first active coating to change, the insulating coating can always cover the first active coating due to the provision of the first groove, reducing the probability of the insulating coating detaching from the first active coating, thereby improving the safety performance of the battery and reducing the probability of deterioration of the battery performance.

[0021] Furthermore, compared to the related art that uses an insulating diaphragm to insulate the positive and negative electrodes of the battery, this application uses an insulating coating to insulate the electrodes. The thickness of the insulating coating is much lower than that of the insulating diaphragm, leaving more space inside the battery for accommodating electrolyte and active materials. This improves internal battery space utilization and thus increases battery capacity. Furthermore, the provision of the first groove strengthens the connection between the insulating coating and the first active coating, effectively reducing the probability of displacement of the insulating diaphragm or even the insulating coating relative to the first active coating due to internal battery cyclic expansion. This effectively reduces the risk of internal battery short circuits and thus improves battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a battery in one embodiment of the present utility model;

[0024] Figure 2 A front view of the first electrode or the second electrode in one embodiment of the present invention;

[0025] Figure 3 A schematic cross-sectional view of a first electrode in an embodiment of the present invention at a first viewing angle;

[0026] Figure 4 2 is a cross-sectional schematic diagram of a first electrode in an embodiment of the present invention at a second viewing angle.

[0027] Description of Figure Numbers:

[0028] Battery 10;

[0029] Battery cell 100;

[0030] a first electrode 110;

[0031] First current collector 111; first region 1111; second region 1112;

[0032] First active coating 112; first groove 1121;

[0033] Insulation coating 120;

[0034] Second electrode 130; second current collector 131; second active coating 132;

[0035] Housing 200; Accommodation space 210;

[0036] First direction X; second direction Y; third direction Z.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] For this reason, see Figures 1 to 4 The utility model provides a battery cell 100, comprising a first electrode 110 and an insulating coating 120. The first electrode 110 comprises a first current collector 111 and a first active coating 112, the first current collector 111 comprising a first region 1111 and a second region 1112 adjacently distributed along a first direction X. The first active coating 112 is applied to the first region 1111, and the second region 1112 is suitable for electrically connecting the tabs. The insulating coating 120 is arranged on the side of the first active coating 112 facing away from the first current collector 111, and the insulating coating 120 has electrical insulation properties. A first groove 1121 is provided on the side of the first active coating 112 facing away from the first current collector 111, and the insulating coating 120 is filled in the first groove 1121 to ensure that the insulating coating 120 can be stably adhered to the first active coating 112.

[0040] It will be appreciated that in some embodiments, by providing a first groove 1121 on the side of the first active coating layer 112 facing away from the first current collector 111 and applying the insulating coating 120 within the first groove 1121, the safety performance of the battery 10 can be significantly improved. Specifically, when the battery cell 100 expands due to internal circulation, the volume of the first active coating layer 112 changes. The provision of the first groove 1121 allows the insulating coating 120 to at least partially fill the first groove 1121 when applied to the first active coating layer 112, thereby strengthening the bonding between the insulating coating 120 and the first active coating layer 112. Even when the battery 10 expands due to internal circulation, the insulating coating 120 is unlikely to shift relative to the first active coating layer 112 and is unlikely to separate from the first active coating layer 112, thus ensuring the insulation performance of the first electrode 110, effectively reducing the risk of short circuits within the battery 10 and thereby improving the safety performance of the battery 10. The insulating coating 120 has electrical insulation properties, effectively preventing short circuits within the battery cell 100. This improves the safety of battery 10. Furthermore, compared to the related art, which uses an insulating diaphragm to insulate the positive and negative electrodes of battery 10, this application uses an insulating coating 120 to insulate the electrodes. Because the thickness of insulating coating 120 is much lower than that of the insulating diaphragm, the internal space of battery 10 can be used to accommodate more electrolyte and active materials, improving the space utilization within battery 10 and thereby increasing the capacity of battery 10.

[0041] See also Figure 3In some embodiments, the dimension D1 of the insulating coating 120 in the first direction X and the dimension L1 of the first active coating 112 in the first direction X satisfy 0mm≤D1-L1≤5mm. This ensures that the insulating coating 120 can closely adhere to the first active coating 112 while neither exceeding too much (occupying too much space and affecting the capacity of the battery 10) nor exceeding too little (incomplete coverage of the first active coating 112 by the insulating coating 120, resulting in insulation failure and an internal short circuit in the battery 10). For example, the dimension difference between the insulating coating 120 and the first active coating 112 in the first direction X can be 0mm, 0.5mm, 1.5mm, 2mm, 3.5mm, 4mm, 5mm, etc. Preferably, 0.2mm≤D1-L1≤2mm. Specifically, by setting the range of D1-L1 between 0 mm and 5 mm, the size of the insulating coating 120 in the first direction X is slightly larger than that of the first active coating 112, thereby ensuring that the insulating coating 120 can completely cover the first active coating 112 and avoiding the situation where the insulating coating 120 cannot completely cover the first active coating 112 due to improper size. In addition, the size of the insulating coating 120 does not exceed the size by too much, avoiding unnecessary gaps caused by excessive size differences, thereby improving the utilization of the internal space of the battery 10.

[0042] The side of the first active coating layer 112 facing away from the second region 1112 is aligned with the side of the first region 1111 facing away from the second region 1112. That is, the edge of the first active coating layer 112 and the edge of the first current collector 111 are aligned on the same side, thereby ensuring consistent alignment between the first active coating layer 112 and the first current collector 111. Specifically, the alignment of the side of the first active coating layer 112 facing away from the second region 1112 with the side of the first region 1111 facing away from the second region 1112 ensures consistent alignment between the first active coating layer 112 and the first current collector 111. During the manufacturing process, this facilitates uniform coating of the first active coating layer 112 on the first current collector 111, avoiding the situation where the coating is locally too thick or too thin due to inconsistent alignment. Furthermore, the alignment of one end of the first active coating layer 112 in the first direction X with one end of the first current collector 111 in the first direction X facilitates consistent alignment between the first active coating layer 112 and the first current collector 111, and also improves the utilization of the internal space of the battery 10.

[0043] See also Figure 4In some embodiments, the dimension D2 of the insulating coating 120 in the second direction Y and the dimension L2 of the first active coating 112 in the second direction Y satisfy 0 mm ≤ D2 - L2 ≤ 5 mm. For example, the difference in the dimensions of the insulating coating 120 and the first active coating 112 in the second direction Y can be 0 mm, 1 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, etc. It should be noted that the second direction Y is perpendicular to the first direction X and is perpendicular to the direction from the first active coating 112 to the first current collector 111. Specifically, the dimension of the insulating coating 120 in the second direction Y is slightly smaller than or equal to the dimension of the insulating coating 120 in the second direction Y. This ensures that the insulating coating 120 can fully cover the first active coating 112, avoiding situations where the insulating coating 120 cannot fully cover the first active coating 112 due to improper dimensions. This improves the insulation performance of the insulating coating 120 relative to the first active coating 112 and reduces the risk of short circuits within the battery 10. In addition, the size of the insulating coating 120 does not exceed the first active coating 112 by too much or too little, thus avoiding unnecessary gaps or overlaps, thereby improving the utilization of the internal space of the battery 10 .

[0044] In some embodiments, the battery cell 100 further includes a second electrode 130. The second electrode 130 includes a second current collector 131 and a second active coating 132 applied to the second current collector 131. The second electrode 130 is located on the side of the insulating coating 120 facing away from the first electrode 110. It will be appreciated that in some embodiments, the provision of the second electrode 130 provides the battery cell 100 with both positive and negative electrodes, thereby forming a complete battery unit 10. Specifically, the design of the second current collector 131 and the second active coating layer 132 is similar to that of the first current collector 111 and the first active coating layer 112 (the specific materials used for the first current collector 111 and the second current collector 131 can be different. The first current collector 111 can be made of copper foil, and the second current collector 131 can be made of aluminum foil. The materials used for the first active coating layer 112 include, but are not limited to, carbon materials, silicon-based materials, titanium-based materials, and alloy materials. The materials used for the second active coating layer 132 include, but are not limited to, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, and other new materials). However, they are located on the side of the insulating coating layer 120 facing away from the first electrode 110, forming the other pole of the battery cell 100. The second electrode 130 is configured as a positive electrode sheet or a negative electrode sheet, and together with the first electrode 110 (configured as a negative electrode sheet or a positive electrode sheet), it constitutes the positive and negative poles of the battery cell 100. A second groove is provided on the side of the second active coating layer 132 facing away from the second current collector 131 to facilitate coating the insulating coating layer 120 in the second groove when the first electrode 110 and the second electrode 130 are combined, thereby fixing the insulating coating layer 120 and the second electrode 130. In some embodiments, the second electrode 130 is the positive electrode of the battery 10. Since the volume change of the positive electrode during circulation within the battery 10 is small, the second active coating layer 132 may not be provided with a second groove.

[0045] In some embodiments, for ease of description, the first electrode 110 is defined as a negative electrode sheet, and the second electrode 130 is defined as a positive electrode sheet. A second groove is provided on the side of the second active coating layer 132 facing away from the second current collector 131. When the first electrode 110 and the second electrode 130 are combined, the insulating coating layer 120 is configured to be applied to the second groove so that the insulating coating layer 120 is fixed to the second electrode 130. The design of the second groove is similar to the first groove 1121, so that the insulating coating layer 120 can be better filled in the second groove, thereby enhancing the bonding force between the insulating coating layer 120 and the second active coating layer 132. When the first electrode 110 and the second electrode 130 are combined, the insulating coating layer 120 is configured to be applied to the second groove. This allows the insulating coating layer 120 to be fixed in the second groove, thereby enhancing the bonding force between the insulating coating layer 120 and the second active coating layer 132 and reducing the probability of the insulating coating layer 120 detaching from the second active coating layer 132.

[0046] In some embodiments, the dimension M1 of the second active coating layer 132 in the first direction X and the dimension L1 of the first active coating layer 112 in the first direction X satisfy the following relationship: 2 mm ≤ L1 - M1 ≤ 5 mm. For example, the difference in the dimensions of the first active coating layer 112 and the second active coating layer 132 in the first direction X can be 2 mm, 2.5 mm, 3 mm, 4 mm, 4.5 mm, 5 mm, etc. It will be appreciated that in some embodiments, by setting the relationship between the dimension M1 of the second active coating layer 132 in the first direction X and the dimension L1 of the first active coating layer 112 in the first direction X, the difference in dimensions between the second active coating layer 132 and the first active coating layer 112 is kept within the range of 2 mm ≤ L1 - M1 ≤ 5 mm. This ensures consistent alignment between the second active coating layer 132 and the first active coating layer 112, improving the manufacturing precision and consistency of the battery cell 100. Furthermore, because the insulating coating layer 120 has electrical insulation properties, it can effectively prevent short circuits within the battery cell 100. The alignment design improves the alignment consistency between the second active coating layer 132 and the first active coating layer 112, thereby improving the insulation performance of the insulating coating layer 120 and reducing the risk of short circuits within the battery 10. Furthermore, the size difference between the second active coating layer 132 and the first active coating layer 112 is within a reasonable range, thereby improving the utilization of the internal space of the battery 10.

[0047] In some embodiments, the battery cell 100 includes a first electrode 110, a second electrode 130, and an insulating coating 120. The first electrode 110 includes a first current collector 111 and a first active coating 112. The second electrode 130 includes a second current collector 131 and a second active coating 132 applied to the second current collector 131. The second electrode 130 is located on the side of the insulating coating 120 facing away from the first electrode 110. The first active coating 112 is provided on both sides of the first current collector 111 that are opposite to each other along a third direction Z. The third direction Z is parallel to the direction of the first active coating 112 pointing toward the first current collector 111. The second active coating 132 is provided on both sides of the second current collector 131 that are opposite to each other along the third direction Z. In this way, the capacity of the battery 10 is further increased.

[0048] In some embodiments, the battery cell 100 further includes a functional component. The functional component is configured to fill the first groove 1121 and bond the insulating coating 120 and the first active coating 112. It will be appreciated that in some embodiments, by providing the functional component to fill the first groove 1121 and bond the insulating coating 120 and the first active coating 112, the connection between the insulating coating 120 and the first active coating 112 is further strengthened. Specifically, the filling effect of the functional component further strengthens the bond between the insulating coating 120 and the first active coating 112. This design improves the bonding strength between the insulating coating 120 and the first active coating 112, thereby preventing the insulating coating 120 from separating from the first active coating 112 during expansion caused by circulation within the battery cell 100. In some embodiments, the functional component is disposed between the insulating coating 120 and the second electrode 130. This allows the first electrode 110 and the insulating coating 120 to achieve a stronger connection through the first groove 1121, and the second electrode 130 and the insulating coating 120 to achieve a stronger connection through the functional component, thereby ensuring the safety of the battery 10.

[0049] See also Figure 1 The present invention also provides a battery 10, comprising a battery cell 100 as described in any of the above-described embodiments or implementations, and a housing 200. The housing 200 has a housing space 210 configured to accommodate the battery cell 100, allowing the battery cell 100 to be safely placed within the housing 200, thereby protecting the battery cell 100 from the external environment and further improving the safety of the battery 10. It will be appreciated that in some embodiments, the housing 200 is provided to accommodate the battery cell 100, thereby providing the battery 10 with a complete structure. Through the above-described design, the battery 10 of the present application can not only effectively improve the safety performance of the battery 10, but also increase the capacity of the battery 10. Furthermore, by providing the housing 200 to accommodate the battery cell 100, the battery cell 100 can be safely placed within the housing 200, further improving the safety and reliability of the battery 10. This design not only improves the performance of the battery 10 but also makes the battery 10 more reliable in practical applications.

[0050] In some embodiments, the accommodating space 210 can be cylindrical, and the outline of the battery 10 can be cylindrical or have other shapes. By using the above-described battery cell 100, the battery 10 can effectively reduce internal expansion stress in the battery 10, thereby improving the cycling stability and safety of the battery 10. The housing 200 can be made of materials such as aluminum-plastic film or a metal shell, with the specific material selected based on the application requirements of the battery 10. The accommodating space 210 of the housing 200 can tightly accommodate the battery cell 100, ensuring the stability and reliability of the battery 10 during use. It should be noted that the first electrode 110 and the second electrode 130 can be stacked together to form the battery cell 100, or the first electrode 110 and the second electrode 130 can be wound together to form the battery cell 100. The first groove 1121 can extend along the first direction X or the second direction Y. A plane perpendicular to the first direction X or the second direction Y is defined as a projection plane. The outlines formed by the first groove 1121 and the second groove on the projection plane include, but are not limited to, rectangular, polygonal, T-shaped, and arc-shaped.

[0051] The design of the shell 200 can also consider the use of high-strength lightweight materials, such as aluminum alloy or carbon fiber composite materials, to reduce the overall weight of the battery 10 while ensuring sufficient strength to protect the battery cell 100 from external impact. A heat dissipation structure, such as a heat sink or a heat pipe, can be provided inside the shell 200 to help the battery 10 dissipate the heat generated during operation, thereby improving the thermal management capability of the battery 10 and further improving the safety and service life of the battery 10. The shell 200 can be integrated with a safety valve to release gas when the internal pressure of the battery 10 is too high to improve safety. The shell 200 can be specially coated or treated to improve its corrosion resistance and wear resistance.

[0052] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A first electrode includes a first current collector and a first active coating, wherein the first current collector includes a first region and a second region adjacently distributed along a first direction, the first active coating is applied to the first region, and the second region is suitable for electrically connecting to a tab; an insulating coating layer, disposed on a side of the first active coating layer facing away from the first current collector, the insulating coating layer being configured to have electrical insulation properties; A first groove is provided on a side of the first active coating layer facing away from the first current collector, so that the insulating coating layer fills the first groove.

2. The battery cell according to claim 1, wherein: A dimension D1 of the insulating coating in the first direction and a dimension L1 of the first active coating in the first direction satisfy 0 mm ≤ D1 - L1 ≤ 5 mm.

3. The battery cell according to claim 2, wherein: A side of the first active coating layer facing away from the second region is aligned with a side of the first region facing away from the second region.

4. The battery cell according to claim 1, wherein: A dimension D2 of the insulating coating in the second direction and a dimension L2 of the first active coating in the second direction satisfy 0mm≤D2-L2≤5mm, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the direction of the first active coating pointing to the first current collector.

5. The battery cell according to claim 1, wherein: The battery cell further includes a second electrode, which includes a second current collector and a second active coating coated on the second current collector. The second electrode is located on a side of the insulating coating facing away from the first electrode.

6. The battery cell according to claim 5, characterized in that The first electrode is configured as a negative electrode sheet, the second electrode is configured as a positive electrode sheet, a second groove is provided on the side of the second active coating facing away from the second current collector, and when the first electrode and the second electrode are combined, the insulating coating is configured to be able to be applied to the second groove so that the insulating coating is fixed to the second electrode.

7. The battery cell according to claim 5, characterized in that A dimension M1 of the second active coating layer in the first direction and a dimension L1 of the first active coating layer in the first direction satisfy the following: 2 mm ≤ L1 − M1 ≤ 5 mm.

8. The battery cell according to claim 5, wherein: The first active coating is provided on both sides of the first current collector relative to each other along a third direction, and the third direction is parallel to the direction of the first active coating pointing to the first current collector, and the second active coating is provided on both sides of the second current collector relative to each other along the third direction.

9. The battery cell according to claim 1, wherein: The battery core further includes a functional component, which is configured to be filled in the first groove and adhere to the insulating coating and the first active coating.

10. A battery, characterized in that: include: The battery cell according to any one of claims 1 to 9; as well as The housing has a housing space configured to accommodate the battery cell.

Images