Top cover assembly and battery cell

Abstract

The present application discloses a top cover assembly and a battery cell. The top cover assembly comprises: a top cover; multiple first poles, arranged on the top cover at intervals in a first direction; and multiple second poles, arranged on the top cover at intervals in the first direction, wherein at least one first pole and at least one second pole are disposed adjacent to each other in the first direction. The multiple first poles are arranged on the top cover at intervals in the first direction and the multiple second poles are arranged on the top cover at intervals in the first direction, the multiple first poles and the multiple second poles are disposed at the same end of the top cover, or the multiple first poles are disposed close to one end of the top cover and the multiple second poles are disposed close to the other end of the top cover.

Description

Top cover assembly and battery cells

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on December 6, 2023, with application numbers 202323334052.6 and 202311679845.3, and the entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery cell technology, and in particular to a top cover assembly and a battery cell. Background Art

[0003] As the capacity of energy storage cells increases, the requirements for the current-carrying capacity of the cell components are becoming increasingly stringent. Conventional structures, due to their limited current-carrying capacity and high internal resistance, increase the cell capacity. During the charge and discharge process, the temperature of the internal components of the cell rises, causing heat to accumulate inside the cell. Excessive heat accumulation can lead to electrolyte instability and diaphragm shrinkage, reducing the safety of the cell. SUMMARY OF THE INVENTION

[0004] The present application provides a top cover assembly and a battery cell to solve the above technical problems.

[0005] The present application provides a top cover assembly, which includes: a top cover; a plurality of first poles, which are arranged on the top cover at intervals along a first direction; a plurality of second poles, which are arranged on the top cover at intervals along the first direction, at least one first pole and at least one second pole are arranged adjacent to each other along the first direction, the plurality of first poles are arranged on the top cover at intervals along the first direction, and the plurality of second poles are arranged on the top cover at intervals along the first direction, the plurality of first poles and the plurality of second poles are arranged at the same end of the top cover, or the plurality of first poles are arranged near one end of the top cover, and the plurality of second poles are arranged near the other end of the top cover.

[0006] The present application also provides a battery cell, which includes: the above-mentioned top cover assembly, a core pack, and a plurality of pole tabs spaced apart along a first direction, wherein the top cover assembly is arranged on the core pack and connected to the pole tabs through a connecting piece. Beneficial effects

[0007] The beneficial effects of the present application are as follows: the top cover assembly provided by the present application is provided with multiple first poles and multiple second poles on the top cover, and the multiple first poles are arranged at intervals on the top cover, and the multiple second poles are also arranged at intervals on the top cover. Such an arrangement can not only meet the output requirements of the top cover assembly, but also improve the overcurrent capacity of the battery cell, ensure the temperature stability of the battery cell during use, so as to improve the safety performance of the battery cell, and at least one first pole and at least one second pole are arranged adjacent to each other along the first direction, or multiple first poles are arranged near one end of the top cover, and multiple second poles are arranged near the other end of the top cover. In this way, the diversity of the top cover assembly can be improved to meet the usage requirements in different environments, thereby improving the applicability and scope of application of the device.

[0008] The battery cell provided in the present application has two core packs, which are arranged sequentially along the second direction. This can improve the current output capacity of the battery cell to meet the user's usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic top view of a top cover assembly provided in a first embodiment of the present application;

[0010] FIG2 is a schematic top view of a top cover assembly provided in a second embodiment of the present application;

[0011] FIG3 is a schematic top view of a top cover assembly provided in a third embodiment of the present application;

[0012] FIG4 is a schematic top view of a top cover assembly provided in a fourth embodiment of the present application;

[0013] FIG5 is a schematic structural diagram of a connector according to one embodiment of the present application;

[0014] FIG6 is a schematic structural diagram of a connector according to another embodiment of the present application;

[0015] FIG7 is a schematic structural diagram of a top cover assembly according to a second embodiment of the present application;

[0016] FIG8 is a schematic structural diagram of a top cover assembly according to a fourth embodiment of the present application;

[0017] FIG9 is a schematic structural diagram of a core package according to one embodiment of the present application;

[0018] FIG10 is a schematic structural diagram of a core package according to another embodiment of the present application.

[0019] Description of reference numerals:

[0020] 10. Top cover;

[0021] 20. First pole;

[0022] 30. Second pole;

[0023] 40. Connecting piece; 41. First connecting piece; 42. Second connecting piece;

[0024] 50. Explosion-proof valve;

[0025] 60. Aluminum sheet;

[0026] 70. Lower plastic plate; 71. Insulation baffle;

[0027] 80, core package;

[0028] 91, first electrode tab; 92, second electrode tab; X, first direction; Y, second direction. Modes for Carrying Out the Invention

[0029] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0032] As shown in Figures 1 to 4, 7 and 8, in a first aspect, an embodiment of the present application provides a top cover assembly, which includes a top cover 10, a plurality of first poles 20 and a plurality of second poles 30. The plurality of first poles 20 are arranged on the top cover 10 at intervals along a first direction, the plurality of second poles 30 are arranged on the top cover 10 at intervals along the first direction, at least one first pole 20 and at least one second pole 30 are arranged adjacent to each other along the first direction, the plurality of first poles 20 are arranged on the top cover 10 at intervals along the first direction and the plurality of second poles 30 are arranged on the top cover 10 at intervals along the first direction, the plurality of first poles 20 and the plurality of second poles 30 are arranged at the same end of the top cover 10, or the plurality of first poles 20 are arranged near one end of the top cover 10, and the plurality of second poles 30 are arranged near the other end of the top cover 10.

[0033] By applying the technical solution of the present application, a plurality of first poles 20 and a plurality of second poles 30 are arranged on the top cover 10, and the plurality of first poles 20 are arranged at intervals on the top cover 10, and the plurality of second poles 30 are also arranged at intervals on the top cover 10. Such an arrangement can not only meet the output requirements of the top cover assembly, but also improve the overcurrent capacity of the battery cell, ensure the temperature stability of the battery cell during use, so as to improve the safety performance of the battery cell, and at least one first pole 20 and at least one second pole 30 are arranged adjacent to each other along the first direction, or a plurality of first poles 20 are arranged near one end of the top cover 10, and a plurality of second poles 30 are arranged near the other end of the top cover 10. In this way, the diversity of the top cover assembly can be improved to meet the usage requirements in different environments, thereby improving the applicability and scope of application of the device.

[0034] In the present application, when at least one first pole 20 and at least one second pole 30 are adjacently arranged along the first direction, the remaining plurality of first poles 20 and the remaining plurality of second poles 30 may be arranged in parallel along the second direction.

[0035] Furthermore, multiple first poles 20 and multiple second poles 30 are arranged at intervals along the same straight line. This arrangement not only makes the overall top cover assembly more beautiful and neat, but also facilitates connection with external components. Optionally, multiple first poles 20 and multiple second poles 30 can also be arranged to be spaced apart in other directions, as long as the use requirements of the device can be met. In this application, the spaced arrangement specifically refers to the multiple first poles 20 and multiple second poles 30 being located on the same straight line. The polarity of the two adjacent poles is not limited here, and the specific setting should be selected according to the use environment of the device.

[0036] Specifically, the plurality of first poles 20 and the plurality of second poles 30 are alternately arranged in the first direction. This arrangement allows the first poles 20 and the second poles 30 to be evenly distributed on the top cover 10, which can make the current density during charging and discharging of the battery cell more uniform, thereby reducing the heating of the battery cell and maintaining stable operation of the battery cell.

[0037] Furthermore, the number of the first poles 20 is equal to the number of the second poles 30. This arrangement can ensure the stability of the battery cell output to maintain the normal operation of the battery cell.

[0038] The first pole 20 is a positive pole, and the second pole 30 is a negative pole.

[0039] In an embodiment of the present application, when the number of the first pole 20 and the second pole 30 are both 2, they can be arranged and combined according to positive-positive-negative-negative, positive-negative-positive, positive-negative-positive-negative, etc., as long as the use requirements of the device can be met; when the number of the first pole 20 and the second pole 30 are both 3, they can be arranged and combined according to positive-positive-positive-negative-negative, positive-positive-negative-positive-negative, positive-positive-negative-positive, positive-positive-negative-positive, positive-positive-negative-positive, positive-positive-negative-positive, positive-positive-negative-positive, etc., which can maximize the applicability and scope of application of the battery cell.

[0040] At the same time, the spacing between multiple poles can be set to the same distance. Through this uniformly distributed design, the current density of the pole pieces is more evenly distributed when the battery cell is charging and discharging, and the multiple poles can evenly distribute the current to improve the stable operation of the battery cell.

[0041] Of course, in other embodiments of the present application, the number of the first pole 20 and the second pole 30 is not limited, and the specific setting should be selected according to the use requirements of the device, so as to meet the use requirements in different environments.

[0042] As shown in Figures 5 and 6, the top cover assembly also includes multiple connectors 40. The connectors 40 are arranged on the side of the top cover 10 away from the first pole 20. The connectors 40 are connected to the first pole 20 or the second pole 30 respectively. In this arrangement, the first pole 20 and the second pole 30 can be connected to the core package 80 through the connectors 40 to ensure internal conduction of the battery cell. When the polarity of two adjacent poles is the same, they can be connected in parallel through the connecting piece in the figure to facilitate the connection of multiple poles in the battery cell.

[0043] As shown in Figures 7 and 8, the connector 40 includes a first connecting piece 41 and a second connecting piece 42. The first connecting piece 41 is used to connect multiple first poles 20 in parallel, and the second connecting piece 42 is used to connect multiple second poles 30 in parallel. The first connecting piece 41 and the second connecting piece 42 are insulated from each other. When the polarity of two adjacent poles is different, a single connecting piece is required to connect the poles. This ensures the safety of the pole connection, prevents short circuits in the battery cell, and thus extends the service life of the battery cell.

[0044] In the present application, an insulating baffle 71 is provided between two adjacent first connecting pieces 41 and second connecting pieces 42 , so as to avoid the risk of short circuit of the battery cell during use, thereby further maintaining the stability of the battery cell during operation.

[0045] The connector 40 has a protrusion, and the bottoms of the first pole 20 and the second pole 30 have a groove, and the shapes and sizes of the protrusion and the groove are adapted to each other. In this way, the connector 40 can be snap-fitted with the first pole 20 or the second pole 30 during installation, which not only reduces the difficulty of installation of the two, but also simplifies the structure and can reduce the production cost of the components, thereby realizing mass production of the device.

[0046] Specifically, the top cover assembly also includes an explosion-proof valve 50, which is provided on the top cover 10 and spaced apart from the first and second poles 20 and 30. This arrangement is primarily intended to prevent dangerous events such as explosion or fire from overcharging or overdischarging the battery cell. When the battery cell expands, the explosion-proof valve 50 opens to reduce the pressure inside the cell, thereby preventing the cell from damaging other components and improving the safety of the battery cell during use.

[0047] Of course, in other embodiments of the present application, the number of explosion-proof valves 50 is not limited. For example, 2, 3, or other numbers can be set as long as the use requirements of the device can be met. At the same time, a liquid injection hole is provided on the top cover 10, which makes it convenient for users to add electrolyte to the inside of the battery cell to ensure uniform infiltration of the inside of the battery cell, thereby improving the electrical performance of the battery cell.

[0048] Furthermore, the top cover 10 includes an aluminum sheet 60 and a lower plastic plate 70 arranged sequentially from top to bottom. The first and second poles 20 and 30 are sequentially connected to the aluminum sheet 60 and the lower plastic plate 70. The connector 40 is provided on the side of the lower plastic plate 70 away from the aluminum sheet 60. This simple and easy-to-manufacture structure not only reduces the manufacturing cost of the device, but also meets the operational requirements of the battery cell.

[0049] In the present application, a sealing ring (not shown in the figure) is also provided on the pole. This arrangement can prevent the electrolyte from seeping out of the pole and causing leakage, thereby ensuring the stability of the battery cell during operation and further extending the service life of the battery cell.

[0050] Secondly, embodiments of the present application provide a battery cell, including a battery cell package 80 comprising: the aforementioned top cover assembly, a core package 80, and a plurality of tabs spaced apart along a first direction; the top cover assembly is disposed on the core package 80 and connected to the tabs via a connecting piece. In the present application, there are two core packages 80, arranged sequentially along a second direction, thereby increasing the current output capacity of the battery cell to meet user requirements.

[0051] As shown in Figures 9 and 10, the tabs include a first tab 91 and a second tab 92. The first tab 91 is provided corresponding to the first pole 20, and the second tab 92 is provided corresponding to the second pole 30. In the present application, when the number and arrangement of the first tab 91 and the second tab 92 correspond to the first pole 20 and the second pole 30, the uniformity and integrity of the cell structure can be ensured.

[0052] In the present application, the length of the battery cell extending along the first direction is L, the length extending along the second direction is H, the length of the connector 40 extending along the first direction is L1, the length extending along the second direction is H1, and the length of the tab extending along the second direction is L2, wherein 1 / 4L>L1>1 / 9L, H≥H1>1 / 3H, 1 / 2L>L2>1 / 8L.

[0053] By applying the technical solution of the present application, a plurality of first poles 20 and a plurality of second poles 30 are arranged on the top cover 10, and the plurality of first poles 20 are arranged at intervals on the top cover 10, and the plurality of second poles 30 are also arranged at intervals on the top cover 10. Such an arrangement can not only meet the output requirements of the top cover assembly, but also improve the overcurrent capacity of the battery cell, ensure the temperature stability of the battery cell during use, so as to improve the safety performance of the battery cell, and at least one first pole 20 and at least one second pole 30 are arranged adjacent to each other along the first direction, or a plurality of first poles 20 are arranged near one end of the top cover 10, and a plurality of second poles 30 are arranged near the other end of the top cover 10. In this way, the diversity of the top cover assembly can be improved to meet the usage requirements in different environments, thereby improving the applicability and scope of application of the device.

Claims

1. A top cover assembly, wherein: The top cover assembly comprises: Top cover (10); A plurality of first poles (20) arranged at intervals on the top cover (10); A plurality of second poles (30) are arranged at intervals on the top cover (10), and at least one of the first poles (20) and at least one of the second poles (30) are arranged adjacent to each other along a first direction; A plurality of first poles (20) are arranged on the top cover (10) at intervals along the first direction, and a plurality of second poles (30) are arranged on the top cover (10) at intervals along the first direction; the plurality of first poles (20) and the plurality of second poles (30) are arranged at the same end of the top cover (10), or the plurality of first poles (20) are arranged close to one end of the top cover (10), and the plurality of second poles (30) are arranged close to the other end of the top cover (10).

2. The top cover assembly according to claim 1, wherein: A plurality of the first poles (20) and a plurality of the second poles (30) are arranged at intervals along the same straight line.

3. The top cover assembly according to claim 1, wherein: A plurality of the first poles (20) and a plurality of the second poles (30) are arranged alternately in sequence in the first direction.

4. The top cover assembly according to claim 1, wherein: The number of the first poles (20) is equal to the number of the second poles (30).

5. The top cover assembly according to any one of claims 1 to 4, wherein: The top cover assembly further comprises an explosion-proof valve (50), wherein the explosion-proof valve (50) is arranged on the top cover (10) and is spaced apart from the first pole (20) and the second pole (30).

6. The top cover assembly according to claim 1, wherein: The top cover assembly further comprises a plurality of connecting members (40), wherein the connecting members (40) are arranged on a side of the top cover (10) away from the first pole (20), and the connecting members (40) are respectively connected to the first pole (20) or the second pole (30).

7. The top cover assembly according to claim 6, wherein: The connecting member (40) comprises a first connecting piece (41) and a second connecting piece (42); the first connecting piece (41) is used to connect a plurality of the first poles (20) in parallel; the second connecting piece (42) is used to connect a plurality of the second poles (30) in parallel; the first connecting piece (41) and the second connecting piece (42) are insulated from each other.

8. The top cover assembly according to claim 6, wherein: The top cover (10) comprises an aluminum sheet (60) and a lower plastic plate (70) which are arranged in sequence from top to bottom, the first pole (20) and the second pole (30) are connected to the aluminum sheet (60) and the lower plastic plate (70) in sequence, and the connecting piece (40) is arranged on a side of the lower plastic plate (70) away from the aluminum sheet (60).

9. A battery cell, wherein: The battery cell (80) comprises: The top cover assembly according to any one of claims 1-4 or 6-8; A core package (80) having a plurality of pole tabs spaced apart along the first direction, wherein the top cover assembly is disposed on the core package (80) and connected to the pole tabs via a connector (40) of the top cover assembly.

10. The battery cell according to claim 9, wherein: The pole lug comprises a first pole lug (91) and a second pole lug (92); the first pole lug (91) is arranged corresponding to a first pole column (20) of the top cover assembly, and the second pole lug (92) is arranged corresponding to a second pole column (30) of the top cover assembly.

11. The top cover assembly according to any one of claims 1 to 8, wherein: When at least one of the first poles (20) and at least one of the second poles (30) are arranged adjacent to each other along the first direction, the remaining plurality of the first poles (20) and the remaining plurality of the second poles (30) may be arranged in parallel along the second direction.

12. The top cover assembly according to any one of claims 1 to 8, wherein: The distance between any two adjacent first poles (20) and the distance between any two adjacent second poles (30) are equal.

13. The top cover assembly according to claim 5, wherein: The number of the explosion-proof valve (50) is set to one.

14. The top cover assembly according to claim 6, wherein: The connecting piece (40) has a protrusion, and the bottoms of the first pole (20) and the second pole (30) have a groove, and the shape and size of the protrusion and the groove are mutually adapted.

15. The top cover assembly according to claim 7, wherein: An insulating baffle (71) is provided between two adjacent first connecting pieces (41) and second connecting pieces (42).

16. The battery cell according to claim 9, wherein: The number of the core packages (80) is specifically set to two.

17. The battery cell according to claim 10, wherein: The number and arrangement of the first pole lugs (91) and the second pole lugs (92) correspond to those of the first pole column (20) and the second pole column (30).

18. The battery cell according to claim 9, wherein: The length of the battery core extending along the first direction is L, and the length of the connecting member (40) extending along the first direction is L1, wherein 1 / 4L>L1>1 / 9L.

19. The battery cell according to claim 18, wherein: The length of the battery core extending along the second direction is H, the length of the connecting member (40) extending along the second direction is H1, and H≥H1>1 / 3H.

20. The battery cell according to claim 18, wherein: The length of the pole tab extending along the second direction is L2, 1 / 2L>L2>1 / 8L.

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