Battery cell and battery pack

Abstract

Disclosed in the present application are a battery cell and a battery pack. The battery cell comprises an electrode assembly. The electrode assembly comprises a main body portion, a positive tab, a negative tab and an isolation strip, wherein the main body portion has a first end surface; the positive tab and the negative tab are both electrically connected to the main body portion; the projection of a first bent portion of the positive tab on the first end surface is a first isolation region, and the projection of a second bent portion of the negative tab on the first end surface is a second isolation region, the second isolation region being spaced apart from the first isolation region; and the isolation strip covers at least a part of the first isolation region and at least a part of the second isolation region. The isolation strip provides insulation and isolation effects, and also serves as a buffer component to prevent the tabs from being reversely inserted into the main body portion and causing a short circuit.

Description

Individual cells and battery packs

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202520551268.8, filed on March 6, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0004] In existing battery structures, the electrode assembly includes a main body and tabs on the main body. The electrode assembly is welded to the terminals on the top cover via the tabs. During assembly, the tabs of the electrode assembly are first welded to the terminals on the top cover, and then the top cover is placed on the housing and sealed. However, when the top cover is connected to the housing and sealed, the top cover presses down on the tabs via the terminals. This may cause the tabs to bend during the pressing process and eventually insert upside down into the main body. This not only easily results in defective products but also poses safety hazards for subsequent testing and use.

[0005] Application content

[0006] The purpose of this application is to provide a single cell and a battery pack to solve the problem in the prior art where the tabs are inserted upside down after the top cover is pressed down, which can easily lead to safety hazards.

[0007] To achieve the above objectives, this application provides a technical solution for a single-cell battery:

[0008] A single cell, having intersecting first, second, and third directions, includes an electrode assembly comprising:

[0009] The main body has a first end face in the direction of the third party;

[0010] Both a positive electrode tab and a negative electrode tab are disposed on the first end face and electrically connected to the main body; the positive electrode tab has a first bending portion, and the projection of the first bending portion along the third direction on the first end face forms a first isolation area; the negative electrode tab has a second bending portion, and the projection of the second bending portion along the third direction on the first end face forms a second isolation area; the second isolation area is spaced apart from the first isolation area.

[0011] An isolation strip is disposed on the main body; the isolation strip is insulated from the positive electrode tab, the negative electrode tab and the main body, and the isolation strip covers at least a portion of the first isolation area and at least a portion of the second isolation area.

[0012] In one embodiment, two positive electrode tabs are provided, the two positive electrode tabs are spaced apart and aligned in the second direction, and the two first bending portions are bent away from each other along the second direction;

[0013] The negative electrode tabs are provided in two ways, and the two negative electrode tabs are spaced apart and aligned in the second direction. The two second bending portions are bent away from each other in the second direction, and the two negative electrode tabs and the two positive electrode tabs are spaced apart in the first direction.

[0014] The isolation zone is provided in multiple ways, and each of the first isolation zone and each of the second isolation zones is covered by the isolation zone.

[0015] In one embodiment, the first end face has a central region located between the first isolation zone and the second isolation zone in the first direction; at least two isolation strips intersect in the central region, and each of the at least two isolation strips covers one of the first isolation zones and one of the second isolation zones.

[0016] In one embodiment, the first end face further has a side region located on the side of the first isolation area away from the second isolation area in the first direction, and the side region is provided with the isolation strip, the isolation strip located in the side region covering the first isolation area.

[0017] In one embodiment, the first end face further has a side region located on the side of the second isolation region away from the first isolation region in the first direction, and the side region is provided with the isolation strip, the isolation strip located in the side region covering the second isolation region.

[0018] In one embodiment, the side area is provided with at least two isolation strips, and the at least two isolation strips intersect in the side area.

[0019] In one embodiment, the main body has a first side and a second side disposed opposite to each other in the second direction;

[0020] The isolation strip includes an adhesive portion, which is adhered to the first side and / or the second side, and at least a portion of the isolation strip is not adhered to the first end face.

[0021] In one embodiment, the main body has a first side and a second side disposed opposite to each other in the second direction;

[0022] The isolation strip includes an adhesive portion that is bonded to the first side and / or the second side, and at least a portion of the isolation strip is not bonded to the first end face, wherein the isolation strip is bonded to the first end face.

[0023] In one embodiment, the isolation strip is adhesive tape.

[0024] In one embodiment, the positive electrode tab and the negative electrode tab are spaced apart and aligned in the first direction, the first bend and the second bend are bent in the same direction in the second direction, and the insulating strip extends along the first direction and covers the first insulating area and the second insulating area.

[0025] In one embodiment, the positive electrode tab and the negative electrode tab are spaced apart and staggered in the first direction, the isolation strip is disposed on the first end face, and the isolation strip covers a portion of the first isolation area and a portion of the second isolation area.

[0026] In one embodiment, the single-cell battery further includes:

[0027] A housing having a receiving cavity, wherein the electrode assembly is disposed in the receiving cavity;

[0028] A top cover assembly includes a top cover, a positive terminal, and a negative terminal. The top cover is connected to the housing and seals the receiving cavity. The positive terminal and the negative terminal are both disposed on the top cover, and at least one of the positive terminal and the negative terminal is insulated from the top cover. The positive terminal is electrically connected to the positive electrode tab, and the negative terminal is electrically connected to the negative electrode tab.

[0029] In one embodiment, the single battery cell further includes a first connecting piece and a second connecting piece, the first connecting piece electrically connecting the positive terminal and the positive electrode tab, and the second connecting piece electrically connecting the negative terminal and the negative electrode tab.

[0030] To achieve the above objectives, this application also provides a technical solution for a battery pack:

[0031] The battery pack includes the individual battery cells described in any of the above technical solutions.

[0032] Compared with the prior art, the single cell and battery pack provided in this application have the following advantages: the single cell includes an electrode assembly, which includes a main body, a positive electrode tab, a negative electrode tab, and a separator. The main body has a first end face in a third direction. The positive electrode tab and the negative electrode tab are both disposed on the first end face and electrically connected to the main body. The electrode assembly conducts current through the positive electrode tab and the negative electrode tab.

[0033] The positive electrode tab has a first bend, and the negative electrode tab has a second bend. The first and second bends are projected onto the first end face along a third direction, forming a first isolation area and a second isolation area, respectively. Both the positive and negative electrode tabs are bent structures, forming a buffer space to cope with the pressure generated when the top cover is pressed down. When pressure is applied by the top cover, the deformation direction of the bends is well controllable, preventing the tabs from being freely bent and inverted into the main body due to pressure. The second isolation area is spaced apart from the first isolation area, spatially reducing the possibility of contact between the positive and negative electrode tabs due to deformation under pressure, ensuring a safe distance.

[0034] In addition, an insulating strip is provided on the main body. The insulating strip is insulated from the positive electrode tab, the negative electrode tab, and the main body, and covers at least a portion of the first isolation area and at least a portion of the second isolation area. Because the insulating strip provides insulation, when the electrode tab is bent and deformed under pressure, the insulating strip blocks the direct contact between the main body and the positive and negative electrode tabs, preventing the electrode tabs from being inserted backwards and causing a short circuit. At the same time, the insulating strip can also reduce the possibility of the bent and deformed electrode tabs causing further compression damage to the main body. Attached Figure Description

[0035] Figure 1 is a schematic diagram of the electrode assembly of a single cell in an embodiment of this application;

[0036] Figure 2 is a structural schematic diagram showing the correspondence between the bent portion and the isolation area in an embodiment of this application;

[0037] Figure 3 is a top view of the electrode assembly of a single cell in an embodiment of this application;

[0038] Figure 4 is a schematic diagram of the left side of the electrode assembly of a single cell in an embodiment of this application;

[0039] Figure 5 is a front view schematic diagram of the electrode assembly of a single cell in an embodiment of this application;

[0040] Figure 6 is an exploded view of the casing and top cover assembly of a single battery cell in an embodiment of this application;

[0041] Figure 7 is a schematic diagram of the assembly of the electrode assembly, housing and top cover assembly of a single cell in an embodiment of this application;

[0042] Figure 8 is a schematic diagram of the electrode assembly of a single cell in another embodiment of this application;

[0043] Figure 9 is a schematic diagram of the electrode assembly of a single cell in another embodiment of this application.

[0044] In the figure: 1-Main body, 11-First isolation area, 12-Second isolation area, 13-First end face, 131-Middle area, 132-Side area, 14-First side side, 15-Second side side, 2-Positive electrode tab, 21-First bending part, 3-Negative electrode tab, 31-Second bending part, 4-Insulation strip, 40-Adhesive part, 5-Electrode assembly, 6-Housing shell, 60-Receiving cavity, 7-Top cover assembly, 70-Top cover, 71-Positive electrode post, 72-Negative electrode post, 73-First connecting piece, 74-Second connecting piece, X-First direction, Y-Second direction, Z-Third direction. Detailed Implementation

[0045] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0046] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. It should also be understood that the terms "first," "second," etc., are used in this application to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0047] As shown in Figures 1 to 7, this application proposes a single-cell battery with intersecting first directions X, second directions Y, and a third direction Z. The single-cell battery includes an electrode assembly 5. The electrode assembly 5 includes: a main body 1, a positive electrode tab 2, a negative electrode tab 3, and a separator strip 4. The main body 1 has a first end face 13 in the third direction Z; the positive electrode tab 2 and the negative electrode tab 3 are both disposed on the first end face 13 and electrically connected to the main body 1. Wherein:

[0048] The positive electrode tab 2 has a first bending portion 21, and the projection of the first bending portion 21 along the third direction Z on the first end face 13 forms a first isolation area 11; the negative electrode tab 3 has a second bending portion 31, and the projection of the second bending portion 31 along the third direction Z on the first end face 13 forms a second isolation area 12, and the second isolation area 12 is spaced apart from the first isolation area 11; the isolation strip 4 is provided on the main body 1, and the isolation strip 4 is insulated from the positive electrode tab 2, the negative electrode tab 3 and the main body 1, and the isolation strip 4 covers at least a portion of the first isolation area 11 and at least a portion of the second isolation area 12.

[0049] The single battery includes an electrode assembly 5, which includes a main body 1, a positive electrode tab 2, a negative electrode tab 3, and a separator 4. The main body 1 has a first end face 13 in the third direction Z. The positive electrode tab 2 and the negative electrode tab 3 are both disposed on the first end face 13 and electrically connected to the main body 1. The electrode assembly 5 leads out the current through the positive electrode tab 2 and the negative electrode tab 3 and connects to the terminal post of the top cover 70.

[0050] The positive electrode tab 2 has a first bending portion 21, and the negative electrode tab 3 has a second bending portion 31. The projection areas of the first bending portion 21 and the second bending portion 31 on the first end face 13 along the third direction Z are the first isolation area 11 and the second isolation area 12, respectively. Both the positive electrode tab 2 and the negative electrode tab 3 are designed with a bending structure. The first bending portion 21 and the second bending portion 31 form a buffer space for the tabs to cope with the pressure generated by the top cover 70 pressing down. When the top cover 70 applies pressure, the deformation direction of the bending portion is well controllable, avoiding the situation where the positive electrode tab 2 and the negative electrode tab 3 are freely bent and inserted into the main body 1 due to pressure. The second isolation area 12 is set at an interval from the first isolation area 11, which spatially reduces the possibility of the positive electrode tab 2 and the negative electrode tab 3 coming into contact due to deformation under pressure, ensuring a safe distance.

[0051] In addition, an insulating strip 4 is provided on the main body 1. The insulating strip 4 is insulated from the positive electrode tab 2, the negative electrode tab 3, and the main body 1, and the insulating strip 4 covers at least a portion of the first isolation area 11 and at least a portion of the second isolation area 12. Since the insulating strip 4 provides insulation, when the positive electrode tab 2 and the negative electrode tab 3 are bent and deformed under pressure, the insulating strip 4 blocks the direct contact between the main body 1 and the positive electrode tab 2 and the negative electrode tab 3 and the main body 1, preventing the positive electrode tab 2 and the negative electrode tab 3 from being inserted backwards and causing a short circuit. At the same time, the insulating strip 4 can also reduce the possibility of the bent and deformed positive electrode tab 2 and the negative electrode tab 3 causing further crushing damage to the main body 1.

[0052] In one embodiment, as shown in Figures 1 and 2, two positive electrode tabs 2 are provided, spaced apart and aligned in the second direction Y, and two first bending portions 21 are bent away from each other along the second direction Y. Two negative electrode tabs 3 are provided, spaced apart and aligned in the second direction Y, and two second bending portions 31 are bent away from each other along the second direction Y. The negative electrode tabs 3 and positive electrode tabs 2 are spaced apart in the first direction X. Multiple isolation strips 4 are provided, and each first isolation area 11 and each second isolation area 12 is at least partially covered by the isolation strip 4.

[0053] Both the positive electrode tab 2 and the negative electrode tab 3 are bipolar tabs, which can disperse the flow and reduce the risk of local overheating. The two first bends 21 and the two second bends 31 are bent away from each other to ensure that the pressure generated by the top cover 71 is evenly distributed, and also to make the spatial layout of the area above the first end face 13 more balanced. Multiple isolation strips 4 provide comprehensive isolation protection for the tabs to prevent short circuits that may be caused by bending or deforming any tab.

[0054] It is understandable that:

[0055] Two positive electrode tabs 2 are spaced apart and aligned in the second direction Y; two negative electrode tabs 3 are spaced apart and aligned in the second direction Y. Here, alignment means that the projections of the tabs in the second direction Y at least partially or completely overlap. For example, if the two positive electrode tabs 2 are exactly the same in size and shape, only with opposite bending directions, then this alignment is the optimal solution, making the corresponding edges of the two positive electrode tabs 2 aligned in the first direction X, and completely overlapping when projected in the second direction Y.

[0056] Two first bending portions 21 bend away from each other along the second direction Y; two second bending portions 31 bend away from each other along the second direction Y. Here, "away from each other" means that the two electrodes are spaced apart in the second direction Y, and the bending direction of the bending portion on one electrode is away from the other electrode, while the bending direction of the bending portion on the other electrode is opposite to the bending direction of the aforementioned bending portion.

[0057] In one embodiment, as shown in Figures 2 and 3, the first end face 13 has a central region 131, which is located between the first isolation region 11 and the second isolation region 12 in the first direction X; there are multiple isolation strips 4, at least two isolation strips 4 intersect in the central region 131, and each of the at least two isolation strips 4 covers a first isolation region 11 and a second isolation region 12.

[0058] At least two isolation strips 4 are intersected in the central region 131, and the central region 131 is located between the first isolation region 11 and the second isolation region 12 in the first direction X. It plays a cooperative insulating role between the positive electrode tab 2 and the negative electrode tab 3, effectively blocking the possible contact path between the positive electrode tab 2 and the negative electrode tab 3, and also preventing the tab from being inserted into the main body 1 in the central region 131 when pressed down. At the same time, it prevents the top cover 70 from directly pressing and contacting the central region 131, thereby improving battery safety.

[0059] In one embodiment, as shown in Figures 2 and 3, the first end face 13 further has a side region 132, which is located on the side of the first isolation region 11 away from the second isolation region 12 in the first direction X. The side region 132 is provided with an isolation strip 4, which covers the first isolation region 11.

[0060] In another embodiment, as shown in Figures 2 and 3, the first end face 13 also has a side area 132, which is located on the side of the second isolation area 12 away from the first isolation area 11 in the first direction X. The side area 132 is also provided with an isolation strip 4, which covers the second isolation area 12.

[0061] As shown in Figures 2 and 3, each of the positive electrode tab 2 and the negative electrode tab 3 has a side region 132 on its opposite side. Each side region 132 has an isolation strip 4, and each isolation strip 4 covers a first isolation area 11 or a second isolation area 12. Furthermore, each side region 132 has at least two isolation strips 4, and these at least two isolation strips 4 intersect within the side region 132. The intersecting isolation strips 4 in the side region 132 increase the area covered by the isolation strips 4 in the first and second isolation areas 11, providing more reliable insulation protection for the positive electrode tab 2 and the negative electrode tab 3, while preventing the top cover 70 from directly pressing against the side region 132.

[0062] There may be only one side region 132, which may be provided only on the side of the positive electrode tab 2 that is away from the negative electrode tab 3, or only on the side of the negative electrode tab 3 that is away from the positive electrode tab 2; or there may be two side regions 132 as shown in Figures 2 and 3.

[0063] An isolation strip 4 is also provided in the side area 132, which can reduce or avoid the possibility that the positive electrode tab 2 and the negative electrode tab 3 will be inserted into the main body 1 in the side area 132 when the top cover 70 is pressed down, so as to reduce safety hazards.

[0064] As a further preferred embodiment, the main body 1 has a first side surface 14 and a second side surface 15 disposed opposite to each other in the second direction Y; the isolation strip 4 includes an adhesive portion 40, which is adhered to the first side surface 14 and / or the second side surface 15, and at least a portion of the isolation strip 4 is not adhered to the first end face 13.

[0065] As shown in Figures 1 and 5, each isolation strip 4 is bonded to the first side 14 and the second side 15 of the main body 1 through the adhesive portions 40 at both ends, thereby achieving the purpose of effectively fixing the isolation strip 4.

[0066] In other embodiments, to simplify the design, the isolation strip 4 can be bonded to the first side surface 14 or the second side surface 15 via an adhesive portion at only one end. Alternatively, the adhesive portion 40 at the end of the isolation strip 4 can be omitted, and the isolation strip 4 can be directly bonded to the first end face 13, achieving the same purpose of fixed connection.

[0067] Optionally, the isolation strip 4 is an adhesive tape. The adhesive tape includes a base and an adhesive, and at least one of the base and the adhesive also has a certain buffering effect, which can buffer the downward pressure on the first end face 13 after the electrode tab is bent, and protect the main body 1.

[0068] In one embodiment, as shown in Figures 6 and 7, the single battery cell further includes: a housing 6 and a top cover assembly 7. Wherein:

[0069] The housing 6 has a receiving cavity 60, and the electrode assembly 5 is disposed in the receiving cavity 60.

[0070] The top cover assembly 7 includes a top cover 70, a positive terminal 71, and a negative terminal 72. The top cover 70 is connected to the housing 6 and seals the receiving cavity 60. The positive terminal 71 and the negative terminal 72 are both located on the top cover 70, and at least one of the positive terminal 71 and the negative terminal 72 is insulated from the top cover 70. The positive terminal 71 is electrically connected to the positive terminal tab 2, and the negative terminal 72 is electrically connected to the negative terminal tab 3.

[0071] Positive terminal 71 and negative terminal 72 are the positive and negative terminals of the single cell output to output the battery current.

[0072] In one embodiment, as shown in Figures 6 and 7, the single battery cell further includes a first connecting piece 73 and a second connecting piece 74. The first connecting piece 73 is electrically connected to the positive terminal 71 and all the positive terminal tabs 2, and the second connecting piece 74 is electrically connected to the negative terminal 72 and all the negative terminal tabs 3.

[0073] The housing 6 provides a cavity 60 for the electrode assembly 5 and provides mechanical protection for the internal electrode assembly 5. The top cover 70 is connected to the housing 6 and seals the cavity 60, ensuring effective isolation between the electrode assembly 5, the electrolyte, and the external environment, thereby ensuring the operational stability of the internal components and the electrode solution. Current conduction paths are provided through the positive terminal 71 and the negative terminal 72, ensuring normal charging and discharging operation. At least one of the positive and negative terminals is insulated from the top cover 70 to prevent short circuits that the top cover 70 may cause.

[0074] In other embodiments, the design of the positive electrode tab 2, the negative electrode tab 3, and the insulating strip 4 can be adapted to meet different insulation requirements.

[0075] As shown in Figure 8, the positive electrode tab 2 and the negative electrode tab 3 are spaced apart and aligned in the first direction X. The first bending portion 21 and the second bending portion 31 are bent in the same way along the second direction Y. The insulating strip 4 extends along the first direction X and covers the first insulating area 11 and the second insulating area 12. The structure of one positive electrode tab 2, one negative electrode tab 3 and one insulating strip 4 is simple. The insulating strip 4 can effectively cover the first insulating area 11 and the second insulating area 12, thereby playing the role of reliably insulating and protecting the main body 1.

[0076] As shown in Figure 9, the positive electrode tab 2 and the negative electrode tab 3 are spaced apart and staggered in the first direction X. An isolation strip 4 is provided on the first end face 13, and the isolation strip 4 covers a part of the first isolation area 11 and a part of the second isolation area 12. Similarly, by means of an obliquely extending isolation strip 4, a part of the first isolation area 11 and a part of the second isolation area 12 can be covered to prevent short circuit problems caused by the electrode tabs being inserted backward into the main body 1.

[0077] This application provides a battery pack, which includes individual cells. The individual cells are the same as the specific embodiments of the individual cells in the embodiments of this application, and will not be described again here.

[0078] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A single-cell battery having intersecting first directions (X), second directions (Y), and third directions (Z), wherein, The single cell includes an electrode assembly (5), which comprises: The main body (1) has a first end face (13) in the third direction (Z); A positive electrode tab (2) and a negative electrode tab (3) are both disposed on the first end face (13) and electrically connected to the main body (1); the positive electrode tab (2) has a first bending portion (21), the projection of the first bending portion (21) along the third direction (Z) on the first end face (13) forms a first isolation area (11); the negative electrode tab (3) has a second bending portion (31), the projection of the second bending portion (31) along the third direction (Z) on the first end face (13) forms a second isolation area (12); the second isolation area (12) and the first isolation area (11) are spaced apart. An isolation strip (4) is provided on the main body (1); the isolation strip (4) is insulated from the positive electrode tab (2), the negative electrode tab (3) and the main body (1), and the isolation strip (4) covers at least a portion of the first isolation area (11) and at least a portion of the second isolation area (12).

2. The single cell according to claim 1, wherein The positive electrode tab (2) is provided in two, and the two positive electrode tabs (2) are spaced apart and aligned in the second direction (Y). The two first bending portions (21) are bent away from each other along the second direction (Y). The negative electrode tab (3) is provided in two, the two negative electrode tabs (3) are spaced apart and aligned in the second direction (Y), the two second bending portions (31) are bent away from each other in the second direction (Y), and the two negative electrode tabs (3) and the two positive electrode tabs (2) are spaced apart in the first direction (X); The isolation zone (4) is provided in multiple ways, and each of the first isolation zone (11) and each of the second isolation zone (12) is covered by the isolation zone (4).

3. The cell according to claim 2, wherein The first end face (13) has a central region (131) located between the first isolation zone (11) and the second isolation zone (12) in the first direction (X); at least two isolation strips (4) intersect in the central region (131), and each of the at least two isolation strips (4) covers one of the first isolation zones (11) and one of the second isolation zones (12).

4. The cell according to claim 3, wherein The first end face (13) also has a side area (132), which is located on the side of the first isolation area (11) away from the second isolation area (12) in the first direction (X). The side area (132) is provided with the isolation strip (4), which covers the first isolation area (11).

5. The single-cell battery according to claim 3, wherein, The first end face (13) also has a side area (132), which is located on the side of the second isolation area (12) away from the first isolation area (11) in the first direction (X). The side area (132) is provided with the isolation strip (4), which covers the second isolation area (12).

6. The single-cell battery according to claim 4 or 5, wherein, The side area (132) is provided with at least two isolation strips (4), and the at least two isolation strips (4) intersect in the side area (132).

7. The single-cell battery according to claim 4 or 5, wherein, The main body (1) has a first side surface (14) and a second side surface (15) disposed opposite to each other in the second direction (Y); The isolation strip (4) includes an adhesive portion (40) which is adhered to the first side surface (14) and / or the second side surface (15), and at least a portion of the isolation strip (4) is not adhered to the first end face (13).

8. The single-cell battery according to claim 4 or 5, wherein, The isolation strip (4) is adhered to the first end face (13).

9. The single-cell battery according to claim 1, wherein, The isolation strip (4) is adhesive tape.

10. The single-cell battery according to claim 1, wherein, The positive electrode tab (2) and the negative electrode tab (3) are spaced apart and aligned in the first direction (X), the first bend (21) and the second bend (31) are both bent toward the same side in the second direction (Y), and the isolation strip (4) extends along the first direction (X) and covers the first isolation area (11) and the second isolation area (12).

11. The single-cell battery according to claim 1, wherein, The positive electrode tab (2) and the negative electrode tab (3) are spaced apart and staggered in the first direction (X). The isolation strip (4) is provided on the first end face (13), and the isolation strip (4) covers a part of the first isolation area (11) and a part of the second isolation area (12).

12. The single-cell battery according to any one of claims 1-11, wherein, The single battery cell also includes: The housing (6) has a receiving cavity (60), and the electrode assembly (5) is disposed in the receiving cavity (60); The top cover assembly (7) includes a top cover (70), a positive terminal (71), and a negative terminal (72). The top cover (70) is connected to the housing (6) and covers the receiving cavity (60). The positive terminal (71) and the negative terminal (72) are both located on the top cover (70), and at least one of the positive terminal (71) and the negative terminal (72) is insulated from the top cover (70). The positive terminal (71) is electrically connected to the positive electrode tab (2), and the negative terminal (72) is electrically connected to the negative electrode tab (3).

13. The single-cell battery according to claim 12, wherein, The single battery also includes a first connecting piece (73) and a second connecting piece (74). The first connecting piece (73) is electrically connected to the positive terminal post (71) and the positive electrode tab (2), and the second connecting piece (74) is electrically connected to the negative terminal post (72) and the negative electrode tab (3).

14. A battery pack, wherein, Including the single-cell battery as described in any one of claims 1-13.

Images