Battery cell and battery

Abstract

The application relates to the technical field of batteries, in particular to a battery cell and a battery. The battery cell comprises a battery cell body, a top seal and a tab. The battery cell body has a length direction and a thickness direction intersecting each other. The top seal is connected to the top surface of the battery cell body in the length direction. Part of the tab is wrapped by the top seal, and one end of the tab extends outward from the top seal. The top seal comprises N stacked layer portions in the length direction and N-1 bending portions. Two layer portions are connected by one bending portion, and N is greater than or equal to 3. The application aims to solve at least one technical problem in the background art and provides a battery cell and a battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell and a battery. Background Technology

[0002] In conventional solutions, when the cell thickness is less than 4.5mm or even thinner, the top seal needs to be bent to the vertical surface of the cell. After bending, the thickness of the head of the cell will exceed the thickness of the cell body. The head of the cell occupies a certain amount of space. As the cell thickness becomes thinner, the thickness of the head after bending the top seal exceeds the thickness of the cell body by a larger and larger amount. Therefore, the large thickness of the cell head makes the problem of cell miniaturization increasingly prominent. Utility Model Content

[0003] The purpose of this application is to provide a battery cell and battery in response to at least one of the technical problems mentioned in the background art.

[0004] To achieve the above objectives, this application adopts the following technical solution: One aspect of this application provides a battery cell, including a battery cell body, a top seal, and tabs. The battery cell body has intersecting length and thickness directions. The top seal is connected to the top surface of the battery cell body in the length direction. A portion of the tabs is wrapped by the top seal, and one end of the tabs extends outward from the top seal. The top seal includes N stacked portions and N-1 bent portions stacked along the length. Each pair of stacked portions is connected by one of the bent portions, and N ≥ 3 in the length direction.

[0005] Optionally, the dimension of each of the stacked portions in the thickness direction is not greater than the dimension of the cell body in the thickness direction, where the thickness direction is the thickness direction of the cell body.

[0006] The beneficial effect of this technical solution is that, after the top seal is bent, the thickness of the battery cell is mainly determined by the thickness of the battery cell body, which further alleviates the problem that the thickness of the battery cell head has an adverse effect on the miniaturization of the battery cell.

[0007] Optionally, in the width direction, the two ends of the top seal are connected to the corresponding sides of the cell body, and the width direction intersects the length direction and the thickness direction respectively.

[0008] Another aspect of this application provides a battery, including the cell provided in this application.

[0009] Optionally, the battery provided in this application further includes an adhesive layer, which is disposed between the stacked portion closest to the cell body and the cell body, and the cell body and the top seal are both fixedly connected to the adhesive layer.

[0010] The beneficial effect of this technical solution is that by setting an adhesive layer to fix the folded top seal to the battery cell body, the top seal can remain in a bent state after bending and is not easy to spring back from the bent state.

[0011] Optionally, the battery provided in this application further includes a protection circuit module, which includes a plate and a nickel sheet fixed to the plate. In the length direction, the nickel sheet and the top seal are both located between the plate and the cell body. The electrode includes a first electrode portion and a second electrode portion that are perpendicularly connected to each other. The first electrode portion is fixed to the top seal and is arranged perpendicular to the thickness direction. The second electrode portion is arranged perpendicular to the length direction. The nickel sheet is fixedly connected to the second electrode portion, or the nickel sheet is disposed on the back of the plate.

[0012] The beneficial effect of this technical solution is that, while bending the top seal, the tabs are also bent to form a first tab portion and a second tab portion that are perpendicular to each other. This reduces the length occupied by the tabs in the length direction, thereby reducing the length of the cell and the battery using the cell.

[0013] Optionally, the nickel sheet is U-shaped, with the opening of the U-shape facing the thickness direction, and the second electrode tab is located on the side of the top seal away from the cell body in the length direction, and the second electrode tab is inserted into the nickel sheet.

[0014] The beneficial effect of this technical solution is that, in other words, the second electrode tab is inserted into the opening of the U-shaped nickel sheet, and the U-shaped nickel sheet clamps the second electrode tab, which can improve the connection strength between the nickel sheet and the electrode tab.

[0015] Optionally, the battery provided in this application further includes a top sealing adhesive tape disposed between the protection circuit module and the top seal in the length direction. The top sealing adhesive tape includes a first adhesive tape portion and a second adhesive tape portion stacked in the length direction, with a gap formed between the first adhesive tape portion and the second adhesive tape portion. The first adhesive tape portion is located between the protection circuit module and the nickel sheet, and the second adhesive tape portion is fixedly connected to the top seal.

[0016] The beneficial effect of this technical solution is that, in this way, insulation between the components on the protection circuit module and the top seal can be achieved through the top sealing adhesive paper.

[0017] Optionally, the battery provided in this application further includes a rubber sleeve that covers the protection circuit module and the top seal.

[0018] The beneficial effect of this technical solution is that the rubber sleeve can tightly cover various components at the battery head.

[0019] Optionally, the battery provided in this application also includes a head adhesive tape, which is a U-shaped piece. The protection circuit module and the top seal are both located inside the U-shaped piece, and the two sides of the opening of the U-shaped piece in the thickness direction are connected to the two side walls of the cell body respectively.

[0020] The beneficial effects of this technical solution are: using adhesive tape at the head facilitates quick and easy wrapping of the electrical components at the battery head, thereby improving production efficiency.

[0021] The technical solution provided in this application can achieve at least one of the following beneficial effects: The battery cell and battery provided in this application have a top seal comprising at least three stacked portions in the length direction, each stacked portion being connected sequentially in the length direction and arranged in a serpentine pattern. The top seal is bent at least three times, which can significantly reduce the size of the top seal in the thickness direction of the battery cell, thereby reducing the size of the corresponding battery cell in the thickness direction and alleviating the problem of the thickness of the battery cell head having an adverse effect on the miniaturization of the battery cell.

[0022] The additional technical features and advantages of this application will become more apparent from the following description or from practical application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a partial structural schematic diagram of one embodiment of the battery cell provided in this application. Figure 2 A three-dimensional structural schematic diagram of one embodiment of the battery provided in this application; Figure 3 A partially enlarged exploded structural diagram of one embodiment of the battery provided in this application; Figure 4 A three-dimensional structural schematic diagram of another embodiment of the battery provided in this application; Figure 5 A partially enlarged exploded structural diagram of another embodiment of the battery provided in this application; Figure 6 This is a partial side-sectional structural diagram of one embodiment of the battery provided in this application.

[0025] Figure label: 01. Rubber sleeve; 02. Battery cell body; 03. Handle; 04. Tail tape; 05. Head adhesive tape; 06. Protection circuit module; 07. Top sealing tape; 08. Adhesive layer; 09. Pole ear; 10. Top seal; 11. Lamination section; 12. Gap; 13. Nickel sheet; 14. First electrode tab; 15. Second pole ear; 16. Plate body. Detailed Implementation

[0026] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] like Figures 1 to 6 As shown, one aspect of this application provides a battery cell, including a battery cell body 02, a top seal 10, and a tab 09. The battery cell body 02 has a length direction and a thickness direction. The top seal 10 is connected to the top surface of the battery cell body 02 in the length direction. A portion of the tab is wrapped by the top seal, and one end of the tab extends outward from the top seal. The top seal 10 includes N stacked portions 11 stacked in the length direction and N-1 bent portions. Each pair of stacked portions 11 is connected by a bent portion, and N≥3.

[0030] Understandably, the length direction is the length direction of the battery cell; the stacked portion 11 is plate-shaped or sheet-shaped. In the embodiments of this application, the top seal 10 preferably includes 3 stacked portions 11, and correspondingly, the top seal 10 is preferably bent 3 times.

[0031] The battery cell provided in this application includes a top seal 10 comprising at least three stacked portions 11 arranged in the length direction. Each stacked portion 11 is connected sequentially in the length direction and arranged in a serpentine pattern. The top seal 10 is bent at least three times, which can significantly reduce the size of the top seal 10 in the thickness direction of the battery cell, thereby reducing the size of the corresponding battery cell in the thickness direction and alleviating the problem that the thickness of the battery cell head has an adverse effect on the miniaturization of the battery cell.

[0032] Optionally, the dimension of each of the stacked portions 11 in the thickness direction is not greater than the dimension of the cell body 02 in the thickness direction, where the thickness direction is the thickness direction of the cell body 02. In this way, after the top seal 10 is bent, the thickness of the cell is mainly determined by the thickness of the cell body 02, further mitigating the problem of the thickness of the cell head having an adverse effect on the miniaturization of the cell.

[0033] Optionally, in the width direction, the two ends of the top seal 10 are connected to the corresponding sides of the cell body 02, and the width direction intersects the length direction and the thickness direction respectively, that is, the length direction, the thickness direction and the width direction intersect each other in pairs. Preferably, the length direction, the thickness direction and the width direction are perpendicular to each other in pairs.

[0034] like Figures 2 to 6 As shown, another aspect of this application provides a battery, including the battery cell provided in the embodiments of this application.

[0035] The battery provided in this application uses the battery cell provided in this application. Since the top seal 10 includes at least three stacked portions 11 stacked in the length direction, and each stacked portion 11 is connected in sequence in the length direction and arranged in a serpentine manner, the top seal 10 needs to be bent at least three times. This can significantly reduce the size of the top seal 10 in the thickness direction of the battery cell, thereby reducing the size of the corresponding battery cell in the thickness direction and alleviating the problem that the thickness of the battery cell head has an adverse effect on the miniaturization of the battery cell.

[0036] Optionally, the battery provided in this application embodiment further includes an adhesive layer 08, which is disposed between the stacked portion 11 closest to the cell body 02 and the cell body 02. Both the cell body 02 and the top seal 10 are fixedly connected to the adhesive layer 08. By providing the adhesive layer 08 to fix the folded top seal 10 to the cell body 02, the bent top seal 10 can remain in a bent state and is not easily springed back from the bent state.

[0037] Optionally, the battery provided in this application embodiment further includes a protection circuit module 06. The protection circuit module 06 includes a plate 16 and a nickel sheet 13 fixed to the plate 16. In the length direction, the nickel sheet 13 and the top seal 10 are both located between the plate 16 and the cell body 02. The cell also includes tabs 09. The tabs 09 include a first tab portion 14 and a second tab portion 15 that are perpendicularly connected to each other. The first tab portion 14 is fixed to the top seal 10 and is arranged perpendicular to the thickness direction. The second tab portion 15 is arranged perpendicular to the length direction. The nickel sheet 13 is fixedly connected to the second tab portion 15. The thickness direction is the thickness direction of the cell body 02, or the nickel sheet 13 is disposed on the back of the plate 16. That is, when the top seal 10 is bent, the tabs 09 are also bent to form the first tab portion 14 and the second tab portion 15 that are perpendicular to each other. In this way, the length occupied by the tabs 09 in the length direction is reduced, thereby reducing the length of the cell and the battery using the cell. Preferably, the nickel sheet 13 is soldered to the battery cell. The protection circuit module 06 is also called a PCM.

[0038] Optionally, the nickel sheet 13 is U-shaped, with the opening of the U-shape facing the thickness direction. In the length direction, the second tab 15 is located on the side of the top seal 10 opposite to the cell body 02, and the second tab 15 is inserted into the nickel sheet 13. That is, the second tab 15 is inserted into the opening of the U-shaped nickel sheet 13, and the U-shaped nickel sheet 13 clamps the second tab 15, which improves the connection strength between the nickel sheet 13 and the tab. Of course, the nickel sheet 13 can also be flat or other shapes.

[0039] Optionally, the battery provided in this application embodiment further includes a top sealing adhesive tape 07 disposed between the protection circuit module 06 and the top seal 10 in the length direction. The top sealing adhesive tape 07 includes a first adhesive tape portion and a second adhesive tape portion stacked in the length direction, with a gap 12 formed between the first adhesive tape portion and the second adhesive tape portion. The first adhesive tape portion is located between the protection circuit module 06 and the nickel sheet 13, and the second adhesive tape portion is fixedly connected to the top seal 10. In this way, the top sealing adhesive tape 07 can achieve insulation between the components on the protection circuit module 06 and the top seal 10.

[0040] Optionally, the battery provided in this application embodiment further includes a rubber sleeve 01, which covers the protection circuit module 06 and the top seal 10. In this way, the rubber sleeve 01 can tightly cover various components at the battery head. Preferably, in this application embodiment, the rubber sleeve 01 is manufactured using low-pressure injection molding.

[0041] Optionally, the battery provided in this embodiment further includes a head adhesive tape 05, which is a U-shaped piece. The protection circuit module 06 and the top seal 10 are both located within the U-shaped piece, and the two sides of the opening of the U-shaped piece in the thickness direction are connected to the two side walls of the cell body 02 respectively. Using the head adhesive tape 05 facilitates the quick wrapping of the electrical components at the battery head, improving production efficiency.

[0042] The battery provided in this application embodiment preferably also includes a handle 03, which is fixed to the side wall of the cell body 02 for easy disassembly after sale; preferably, the tail tape 04 is used to insulate the sealing edge of the cell tail.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, The battery cell body (02), top seal (10), and tab (09) are included. The battery cell body (02) has intersecting length and thickness directions. The top seal (10) is connected to the top surface of the battery cell body (02) in the length direction. Part of the tab (09) is wrapped by the top seal (10) and one end of the tab (09) extends outward from the top seal (10). The top seal (10) includes N stacked portions (11) stacked in the length direction and N-1 bent portions, with each pair of stacked portions (11) connected by a bent portion, and N≥3.

2. The battery cell according to claim 1, characterized in that, The dimension of each of the stacked portions (11) in the thickness direction is not greater than the dimension of the cell body (02) in the thickness direction.

3. The battery cell according to claim 1 or 2, characterized in that, In the width direction, the two ends of the top seal (10) are connected to the corresponding sides of the cell body (02), and the width direction intersects the length direction and the thickness direction respectively.

4. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 3.

5. The battery according to claim 4, characterized in that, It also includes an adhesive layer (08), which is disposed between the stacked portion (11) closest to the cell body (02) and the cell body (02), and the cell body (02) and the top seal (10) are both fixedly connected to the adhesive layer (08).

6. The battery according to claim 4 or 5, characterized in that, It also includes a protection circuit module (06), which includes a plate (16) and a nickel sheet (13) fixed to the plate (16). The nickel sheet (13) and the top seal (10) are both located between the plate (16) and the cell body (02) in the length direction. The tab (09) includes a first tab (14) and a second tab (15) that are perpendicularly connected to each other. The first tab (14) is fixed to the top seal (10). The first tab (14) is arranged perpendicular to the thickness direction. The second tab (15) is arranged perpendicular to the length direction. The nickel sheet (13) is fixedly connected to the second tab (15), or the nickel sheet (13) is arranged on the back of the plate (16).

7. The battery according to claim 6, characterized in that, The nickel sheet (13) is U-shaped with the opening of the U-shape facing the thickness direction. The second electrode tab (15) is located on the side of the top seal (10) away from the cell body (02) in the length direction. The second electrode tab (15) is inserted into the nickel sheet (13).

8. The battery according to claim 7, characterized in that, It also includes a top sealing adhesive tape (07) disposed between the protection circuit module (06) and the top seal (10) in the length direction. The top sealing adhesive tape (07) includes a first adhesive tape portion and a second adhesive tape portion stacked in the length direction. A gap (12) is formed between the first adhesive tape portion and the second adhesive tape portion. The first adhesive tape portion is located between the protection circuit module (06) and the nickel sheet (13). The second adhesive tape portion is fixedly connected to the top seal (10).

9. The battery according to claim 7, characterized in that, It also includes a rubber sleeve (01), which covers the protection circuit module (06) and the top seal (10).

10. The battery according to claim 7, characterized in that, It also includes a head adhesive tape (05), which is a U-shaped piece. The protection circuit module (06) and the top seal (10) are both located inside the U-shaped piece. The two sides of the opening of the U-shaped piece in the thickness direction are connected to the two side walls of the battery cell body (02) respectively.

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