Cover body of battery cell and battery cell
By designing a current-limiting groove on the battery cell cover, the risk of short circuit caused by electrolyte overflow is solved, improving the production qualification rate and efficiency of battery cells, and enhancing safety and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZEEKR INTELLIGENT TECH CO LTD
- Filing Date
- 2025-02-06
- Publication Date
- 2026-05-01
AI Technical Summary
During the production of lithium-ion battery cells, electrolyte may overflow and enter the gap between the electrode post and the cover body, leading to short circuit risk and affecting production efficiency and yield.
Design a battery cell cover including a current-limiting groove located between the electrode post and the liquid injection hole, extending to the edge of the cover body, to prevent electrolyte from flowing into the gap between the electrode post and the cover body, thus avoiding short circuit.
It effectively prevents electrolyte from flowing into the gap between the electrode post and the cover body, improving the yield and efficiency of battery cell production, and enhancing safety and reliability.
Smart Images
Figure CN224191041U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a cover for a battery cell and a battery cell having the cover. Background Technology
[0002] In related technologies, during the production of lithium-ion battery cells, from the completion of the first electrolyte injection to the welding of the injection hole sealing pin, the injection hole is not sealed. The battery cell is subjected to restraint forces and negative pressure suction in some processes, such as the formation process and the negative pressure plugging process. This may cause electrolyte to overflow. The overflowing electrolyte may flow to the electrode post and enter the gap between the electrode post and the cover body. Since the electrolyte has weak conductivity, it will create an electronic path between the electrode post and the cover body, causing a short circuit risk in the battery cell. Therefore, it is necessary to clean the electrolyte or downgrade the battery cell to a defective product, which affects production efficiency and yield. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cover for a battery cell that prevents electrolyte from flowing into the gap between the electrode post and the cover body, thus avoiding electrolyte contamination of the electrode post and the risk of short circuits in the battery cell. This, in turn, helps to improve the production qualification rate and efficiency of battery cells.
[0004] This utility model also proposes a battery cell using the above-mentioned cover.
[0005] A cover for a battery cell according to a first aspect of the present invention includes: a cover body and an electrode post, the electrode post being disposed through the cover body, the cover body having an injection hole, the electrode post and the injection hole being spaced apart, and a current-limiting groove being formed on the outer surface of the cover body and recessed into the cover body, the current-limiting groove being located between the electrode post and the injection hole, and the current-limiting groove extending to the edge of the cover body.
[0006] The cover of the battery cell according to the embodiments of this application can prevent electrolyte from flowing into the gap between the electrode post and the cover body, avoid electrolyte contamination of the electrode post and the risk of short circuit in the battery cell, and help improve the production qualification rate and production efficiency of the battery cell.
[0007] According to some embodiments of the present invention, along the extending direction of the flow-limiting groove, both ends of the flow-limiting groove extend to the edge of the cover body.
[0008] According to some embodiments of the present invention, the flow limiting groove has a bent groove section, which protrudes toward the injection hole along the arrangement direction of the electrode post and the injection hole.
[0009] According to some embodiments of the present invention, the bending groove segment is formed at the middle position of the flow limiting groove along the extension direction of the flow limiting groove.
[0010] According to some embodiments of this utility model, along the arrangement direction of the electrode post and the injection hole, the bent groove section is opposite to the injection hole.
[0011] According to some embodiments of the present invention, the flow-limiting groove is an arc-shaped structure to form the bent groove section.
[0012] According to some embodiments of the present invention, the flow-limiting groove includes: a first inclined groove segment and a second inclined groove segment, the first inclined groove segment and the second inclined groove segment are arranged in a direction perpendicular to the arrangement direction of the electrode post and the injection hole, the first inclined groove segment and the second inclined groove segment are bent and connected to form the bent groove segment, from the first inclined groove segment to the second inclined groove segment, the first inclined groove segment is inclined in the direction away from the electrode post, and the second inclined groove segment is inclined in the direction away from the injection hole.
[0013] According to some embodiments of the present invention, both the first inclined groove segment and the second inclined groove segment are constructed as straight segments.
[0014] According to some embodiments of the present invention, the first inclined groove segment and the second inclined groove segment form an included angle β, which satisfies the relationship: 45°≤β≤135°.
[0015] The battery cell according to the second aspect of the present invention includes the cover of the battery cell described in the above embodiments.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0018] Figure 1 This is a schematic diagram of the cover of a battery cell according to the first embodiment of this application;
[0019] Figure 2 This is a top view of the cover of a battery cell according to the second embodiment of this application;
[0020] Figure 3 yes Figure 2 Schematic diagram of cross-section at point AA.
[0021] Figure label:
[0022] Cover 1,
[0023] The cover body 10 includes an injection hole 11, a first hole section 111, a second hole section 112, a first side surface 12, and a second side surface 13.
[0024] Electrode post 20,
[0025] The flow-limiting channel 30, the first inclined channel section 31, and the second inclined channel section 32. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0027] The following is for reference. Figures 1-3 The present invention describes a cover 1 for a battery cell according to an embodiment of the present invention. The cover 1 can be installed on the battery cell.
[0028] According to the first aspect embodiment of the present invention, the cover 1 of the battery cell is as follows: Figures 1-3 As shown, the cover 1 of the battery cell may include: a cover body 10 and an electrode post 20. The electrode post 20 passes through the cover body 10. The cover body 10 has an injection hole 11. The electrode post 20 and the injection hole 11 are spaced apart. A flow limiting groove 30 is formed on the outer surface of the cover body 10 and is recessed into the cover body 10. The flow limiting groove 30 is located between the electrode post 20 and the injection hole 11 and extends to the edge of the cover body 10.
[0029] It should be noted that in the relevant technologies, during the production of lithium-ion battery cells, from the completion of the first electrolyte injection to the welding of the electrolyte injection hole sealing pin, the electrolyte injection hole is not sealed. The battery cell is subjected to restraint force and negative pressure suction in some processes, such as the formation process and the negative pressure plugging process, which may cause electrolyte to overflow. The overflowing electrolyte may flow to the electrode post and enter the gap between the electrode post and the cover body. Since the electrolyte has weak conductivity, it will create an electronic path between the electrode post and the cover body, causing a short circuit risk in the battery cell. Therefore, it is necessary to clean the electrolyte or downgrade the battery cell to a defective product, which affects production efficiency and yield.
[0030] Based on this, this application proposes a cover 1 for a battery cell, wherein an electrode post 20 can be inserted into the cover body 10 along the thickness direction of the cover body 10, and the electrode post 20 can be connected to the cover body 10 by means of screwing, riveting, etc. When the cover 1 of the battery cell is as follows... Figure 1 When setting the orientation, the thickness direction of the cover body 10 can be... Figure 1 The electrode post 20 can protrude from the outer surface of the cover body 10, and a gap is formed between the electrode post 20 and the cover body 10. As an example, the electrode post 20 can be fitted with an upper plastic, which can be disposed between the electrode post 20 and the cover body 10 to separate the electrode post 20 and the cover body 10. The cover body 10 can be formed with an injection hole 11, which can penetrate the cover body 10 along the thickness direction, and the electrolyte can enter the battery cell through the injection hole 11. The electrode post 20 and the injection hole 11 can be spaced apart. As an example, the electrode post 20 and the injection hole 11 can be arranged along a first direction. When the cover 10 of the battery cell is... Figure 1 When setting the direction, the first direction can be... Figure 1 The X-direction in the middle.
[0031] As an example, such as Figure 3 As shown, the injection hole 11 may include a first hole segment 111 and a second hole segment 112. The first hole segment 111 and the second hole segment 112 may be arranged sequentially along the thickness direction of the cap body 10, and the first hole segment 111 may be connected to the second hole segment 112. The first hole segment 111 and the second hole segment 112 may be coaxially arranged, and the diameter of the first hole segment 111 may be larger than the diameter of the second hole segment 112. The first hole segment 111 is adjacent to the outer surface of the cap body 10, and the second hole segment 112 may be located on the side of the first hole segment 111 that is away from the outer surface of the cap body 10.
[0032] The cover body 10 forms a flow-limiting groove 30, which can be located on the outer surface of the cover body 10. Along the thickness direction of the cover body 10, the flow-limiting groove 30 is recessed towards the inside of the cover body 10, and can also be open towards the outer surface of the cover body 10. Along the arrangement direction of the electrode posts 20 and the injection holes 11, the flow-limiting groove 30 can be spaced apart from both the electrode posts 20 and the injection holes 11, and can be located between the electrode posts 20 and the injection holes 11. The flow-limiting groove 30 can extend to the edge of the cover body 10, meaning at least one end of the flow-limiting groove 30 can be connected to the edge of the cover body 10. As an example, the liquid in the flow-limiting groove 30 can flow to both sides of the cover body 10 along the arrangement direction perpendicular to the electrode post 20 and the injection hole 11, thereby allowing the liquid in the flow-limiting groove 30 to flow to the edge of the cover body 10. This helps to reduce the probability of the liquid in the flow-limiting groove 30 flowing on the outer surface of the cover body 10 and reduces the probability of the liquid in the flow-limiting groove 30 flowing to the electrode post 20.
[0033] As an example, the current-limiting groove 30 can extend along the second direction, and the current-limiting groove 30 can extend to the edge of the cover body 10 along the second direction, when the cover 1 of the battery cell is as follows: Figure 1 When setting the direction, the second direction can be... Figure 1 The Y-direction, the first direction, the second direction, and the thickness direction of the cover body 10 are perpendicular to each other. The flow-limiting groove 30 can extend straight along the second direction, that is, the flow-limiting groove 30 can be parallel to the second direction, or the flow-limiting groove 30 can extend obliquely along the second direction, that is, the flow-limiting groove 30 and the second direction form an angle, or the flow-limiting groove 30 can be arc-shaped and extend along the second direction.
[0034] In the prior art, during the production process where the electrolyte injection hole of the battery cell is not sealed, the electrolyte may overflow due to the restraining force and negative pressure suction. If the overflowing electrolyte flows into the gap between the electrode post and the cover body, due to the weak conductivity of the electrolyte, an electronic path will be formed between the electrode post and the cover body, causing a short circuit in the battery cell.
[0035] When the electrolyte inside the battery cell overflows through the injection hole 11, the overflowing electrolyte can flow into the current-limiting groove 30. The electrolyte can flow along the extension direction of the current-limiting groove 30 to the edge of the cover body 10. The current-limiting groove 30 can change the direction of electrolyte flow, reducing the probability of overflowing electrolyte flowing to the electrode post 20. The current-limiting groove 30 can effectively block the electrolyte from flowing to the electrode post 20, preventing electrolyte from flowing into the gap between the electrode post 20 and the cover body 10, avoiding electrolyte contamination of the electrode post 20 and the risk of short circuit in the battery cell, which is beneficial to improving the production qualification rate and production efficiency of the battery cell.
[0036] In some embodiments of this utility model, along the extending direction of the flow limiting groove 30, both ends of the flow limiting groove 30 extend to the edge of the cover body 10.
[0037] Along the extension direction of the flow limiting groove 30, both ends of the flow limiting groove 30 can extend to the edge of the cover body 10, and both ends of the flow limiting groove 30 can be connected to the edge of the cover body 10, so that the electrolyte in the flow limiting groove 30 can flow to the edge of the cover body 10 through both ends of the flow limiting groove 30, which is beneficial to improving the flow efficiency of the electrolyte.
[0038] As an example, the cover body 10 has two opposite sides along a second direction, which can be a first side 12 and a second side 13, respectively. The first side 12 and the second side 13 can be arranged opposite to each other and spaced apart along the second direction. The electrolyte in the flow-limiting groove 30 can flow along the extension direction of the flow-limiting groove 30 to the first side 12 and the second side 13, thereby achieving the effect of diverting the electrolyte and improving the flow efficiency of the electrolyte.
[0039] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the flow limiting groove 30 has a bent groove section that protrudes toward the injection hole 11 along the arrangement direction of the electrode post 20 and the injection hole 11.
[0040] The flow-limiting groove 30 has a bent groove section. As an example, the flow-limiting groove 30 can be constructed as an arc shape, V shape, Z shape, etc. Along the arrangement direction of the electrode post 20 and the injection hole 11, the bent groove section can protrude towards the injection hole 11. When the cover 1 is placed vertically, i.e., the first direction is the height direction of the cover 1, and the injection hole 11 is located above the electrode post 20, the electrolyte overflowing from the injection hole 11 can flow downwards under the action of gravity. The flow-limiting groove 30 can then block the electrolyte flowing towards the electrode post 20. When the cover 1 is placed vertically, i.e., the thickness direction of the cover body 10 is the height direction of the cover 1, the electrolyte in the flow-limiting groove 30 can flow along the extension direction of the flow-limiting groove 30. The electrolyte can flow to the first side 12 and the second side 13, and under the action of gravity, the electrolyte can flow downwards on the first side 12 and the second side 13. The electrolyte can flow into the flow-limiting tank 30 and can flow along the extension direction of the flow-limiting tank 30. The electrolyte can flow to the first side 12 and the second side 13. Under the action of gravity, the electrolyte can flow downward on the first side 12 and the second side 13. Under the action of gravity, the flow rate of the electrolyte in the flow-limiting tank 30 can be increased, and the probability of the electrolyte overflowing the flow-limiting tank 30 and flowing to the electrode post 20 can be reduced, which is beneficial to improving the safety and reliability of the cover 1.
[0041] In some embodiments of this utility model, a bent groove section is formed at the middle position of the flow limiting groove 30 along the extension direction of the flow limiting groove.
[0042] The bent groove section can be located in the middle of the flow-limiting groove 30, and the middle of the flow-limiting groove 30 can protrude towards the injection hole 11. When the electrolyte flows into the bent groove section of the flow-limiting groove 30, the electrolyte can flow from the middle of the flow-limiting groove 30 towards both sides of the flow-limiting groove 30 in the second direction. The electrolyte can be diverted at the middle of the flow-limiting groove 30, and can flow to the first side 12 and the second side 13 respectively. The distance between the middle of the flow-limiting groove 30 and the first side 12 and the second side 13 can be equal, and the time for the electrolyte to flow from the middle of the flow-limiting groove 30 to the first side 12 and the second side 13 can be the same. This is beneficial for the electrolyte to be evenly distributed in the flow-limiting groove 30, which can reduce the probability of turbulence in the electrolyte in the flow-limiting groove 30, reduce the risk of electrolyte overflow from the flow-limiting groove 30, and reduce the probability of electrolyte flowing into the gap between the electrode post 20 and the cover body 10, which is beneficial for improving the safety of the cover 1.
[0043] In some embodiments of this utility model, along the arrangement direction of the electrode post 20 and the injection hole 11, the bent groove section is opposite to the injection hole 11.
[0044] Along the arrangement direction of the electrode posts 20 and the injection holes 11, the bent groove protrudes towards the injection holes 11, and the bent groove can be arranged opposite to the injection holes 11. At least a portion of the bent groove is arranged opposite to the injection holes 11 along the arrangement direction of the electrode posts 20 and the injection holes 11. As an example, the plane containing the midline of the bent groove along the arrangement direction of the electrode posts 20 and the injection holes 11 can coincide with the central axis of the injection holes 11 along the arrangement direction of the electrode posts 20 and the injection holes 11. In other words, the line connecting the endpoint of the bent groove closest to the injection hole 11 and the center of the injection hole 11 along the arrangement direction of the electrode posts 20 and the injection holes 11 (i.e., the first direction) can be parallel to the arrangement direction of the electrode posts 20 and the injection holes 11, and the bent groove can be directly opposite to the injection holes 11 along the arrangement direction of the electrode posts 20 and the injection holes 11. As another example, the plane containing the midline of the bending groove segment along the arrangement direction of the electrode post 20 and the injection hole 11 and the central axis of the injection hole 11 can be spaced apart along the second direction. The distance between the midline of the bending groove segment and the central axis of the injection hole 11 along the second direction is less than the radius of the injection hole 11. Part of the structure of the bending groove segment and part of the structure of the injection hole 11 can be staggered along the arrangement direction of the electrode post 20 and the injection hole 11.
[0045] When the bent groove section is aligned with the injection hole 11 along the arrangement direction of the electrode post 20 and the injection hole 11, the distance between the bent groove section and the injection hole 11 can be minimized, which can shorten the time for the electrolyte to enter the flow-limiting tank 30 and improve the probability of the electrolyte flowing into the flow-limiting tank 30. When the electrolyte overflows from the injection hole 11, the electrolyte can enter the flow-limiting tank 30 through the middle position of the flow-limiting tank 30 and flow along the flow-limiting tank 30 to both sides of the cover body 10 along the second direction.
[0046] In some embodiments of this utility model, such as Figure 2 As shown, the flow-limiting groove 30 has an arc-shaped structure to form a bent groove section.
[0047] The flow-limiting groove 30 can be constructed as an arc shape, and the flow-limiting groove 30 constructed as an arc shape can form a bent groove section. The bent groove section protrudes towards the injection hole 11, so that the electrolyte can be diverted within the flow-limiting groove 30. By setting the flow-limiting groove 30 as an arc shape, the structure of the flow-limiting groove 30 is made smooth, and the electrolyte can flow smoothly within the flow-limiting groove 30, reducing the risk of electrolyte accumulation within the flow-limiting groove 30 and reducing the probability of electrolyte overflowing from the flow-limiting groove 30.
[0048] In some embodiments of this utility model, such as Figure 2 As shown, the flow-limiting groove 30 has an arc-shaped structure.
[0049] The arc-shaped current-limiting groove 30 can be symmetrical about its center. Along the second direction, the current-limiting grooves 30 on both sides of the center can have the same shape. This allows the electrolyte to flow uniformly along the arc-shaped current-limiting groove 30, which helps increase the electrolyte flow rate and reduce the electrolyte's flow time within the current-limiting groove 30, thus improving the safety of the battery cell. Furthermore, the arc-shaped current-limiting groove 30 has a simple structure and is easy to manufacture.
[0050] In some embodiments of this utility model, such as Figure 1 As shown, the flow limiting groove 30 may include: a first inclined groove section 31 and a second inclined groove section 32. The first inclined groove section 31 and the second inclined groove section 32 are arranged in a direction perpendicular to the arrangement direction of the electrode post 20 and the injection hole 11. The first inclined groove section 31 and the second inclined groove section 32 are bent and connected to form a bent groove section. From the first inclined groove section 31 to the second inclined groove section 32, the first inclined groove section 31 is inclined in the direction away from the electrode post 20, and the second inclined groove section 32 is inclined in the direction away from the injection hole 11.
[0051] The first inclined groove segment 31 and the second inclined groove segment 32 are connected, and the first inclined groove segment 31 and the second inclined groove segment 32 can be arranged in a direction perpendicular to the arrangement direction of the electrode post 20 and the liquid injection hole 11. The first inclined groove segment 31 and the second inclined groove segment 32 are respectively connected to the first side surface 12 and the second side surface 13. The first inclined groove segment 31 can extend to one of the first side surface 12 and the second side surface 13, and the second inclined groove segment 32 can extend to the other of the first side surface 12 and the second side surface 13, so that the electrolyte in the first inclined groove segment 31 and the second inclined groove segment 32 can be discharged from the flow limiting groove 30. In this embodiment, the first inclined groove segment 31 extending to the first side surface 12 and the second inclined groove segment 32 extending to the second side surface 13 are used as examples for description.
[0052] The first inclined groove segment 31 and the second inclined groove segment 32 are bent and connected. The first inclined groove segment 31 and the second inclined groove segment 32 have different inclination directions, so that the flow limiting groove 30 can form a bent groove segment. From the first inclined groove segment 31 to the second inclined groove segment 32, the first inclined groove segment 31 is inclined in the direction away from the electrode post 20, and the extension direction of the first inclined groove segment 31 forms an angle with the second direction, which can be an acute angle. The second inclined groove segment 32 is inclined in the direction away from the injection hole 11, and the extension direction of the second inclined groove segment 32 forms an angle with the second direction, which can be an acute angle. The first inclined groove segment 31 and the second inclined groove segment 32 are connected. The first inclined groove segment 31 and the second inclined groove segment 32 can be located on the same side of the first direction along the connection point of the first inclined groove segment 31 and the second inclined groove segment 32, and the first inclined groove segment 31 and the second inclined groove segment 32 are located on the side away from the injection hole 11 at the connection point of the first inclined groove segment 31 and the second inclined groove segment 32. The connection between the first inclined groove section 31 and the second inclined groove section 32 protrudes towards the injection hole 11. The connection between the first inclined groove section 31 and the second inclined groove section 32 can be the middle position of the flow-limiting groove 30, so that the electrolyte overflowing from the injection hole 11 can enter the flow-limiting groove 30 through the connection between the first inclined groove section 31 and the second inclined groove section 32. The electrolyte can flow into the first inclined groove section 31 and the second inclined groove section 32 respectively. The inclined first inclined groove section 31 and the second inclined groove section 32 can improve the flow rate of the electrolyte.
[0053] In some embodiments of this utility model, such as Figure 1 As shown, both the first inclined groove segment 31 and the second inclined groove segment 32 are constructed as straight segments.
[0054] Both the first inclined tank section 31 and the second inclined tank section 32 are constructed as straight sections, which helps to shorten the flow path of the electrolyte in the flow-limiting tank 30, reduce the flow time of the electrolyte in the flow-limiting tank 30, and reduce the risk of the electrolyte overflowing from the flow-limiting tank 30 and flowing between the electrode post 20 and the cover body 10. In addition, the first inclined tank section 31 and the second inclined tank section 32, which are constructed as straight sections, have a simple structure, are easy to process, and help to reduce production costs.
[0055] As an example, the first inclined tank segment 31 and the second inclined tank segment 32 can be symmetrical about the connection point of the first inclined tank segment 31 and the second inclined tank segment 32. The lengths of the first inclined tank segment 31 and the second inclined tank segment 32 can be equal. The angle between the extension direction of the first inclined tank segment 31 and the second direction can be equal to the angle between the extension direction of the second inclined tank segment 32 and the second direction, so that the electrolyte can be evenly distributed in the first inclined tank segment 31 and the second inclined tank segment 32.
[0056] In some embodiments of this utility model, an included angle β is formed between the first inclined groove segment 31 and the second inclined groove segment 32, satisfying the relationship: 45°≤β≤135°.
[0057] An angle can be formed between the first inclined groove segment 31 and the second inclined groove segment 32. For example, the angle between the first inclined groove segment 31 and the second inclined groove segment 32 can be 45°, 60°, 80°, 105°, 135°, etc. The angle between the first inclined groove segment 31 and the second inclined groove segment 32 can be within the range of 45° to 135°, including any value including the endpoint value; any value is an optional angle between the first inclined groove segment 31 and the second inclined groove segment 32 in this invention. If the angle between the first inclined groove segment 31 and the second inclined groove segment 32 is less than 45°, resulting in excessively long lengths of the first inclined groove segment 31 and the second inclined groove segment 32, the electrolyte will flow for a long time within the first inclined groove segment 31 and the second inclined groove segment 32, making it impossible to quickly guide the electrolyte to the first side surface 12 and the second side surface 13 of the cover body 10. If the angle between the first inclined section 31 and the second inclined section 32 is greater than 135°, it will affect the flow guiding effect of the flow-limiting groove 30. When the cover 1 is placed in a vertical position, the electrolyte in the flow-limiting groove 30 may overflow under the action of gravity. Therefore, the angle between the first inclined section 31 and the second inclined section 32 should be between 45° and 135° to ensure that the electrolyte can flow in the flow-limiting groove 30, reduce the probability of the electrolyte flowing between the electrode post 20 and the cover body 10, and improve the safety of the cover 1.
[0058] The battery cell according to the second aspect of the present invention includes the cover 1 of the battery cell in the above embodiment.
[0059] According to the embodiments of this application, the battery cell using the cover 1 of the battery cell in the above embodiments can improve the safety and reliability of the battery cell.
[0060] The cover 1 of the battery cell according to the present invention and other components and operations of the battery cell are known to those skilled in the art and will not be described in detail here.
[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A cover for a battery cell, characterized by include: The cover body (10) and the electrode post (20) are provided. The electrode post (20) passes through the cover body (10). The cover body (10) has a liquid injection hole (11). The electrode post (20) and the liquid injection hole (11) are spaced apart. The outer surface of the cover body (10) has a flow limiting groove (30) that is recessed into the cover body (10). The flow limiting groove (30) is located between the electrode post (20) and the liquid injection hole (11), and the flow limiting groove (30) extends to the edge of the cover body (10).
2. The cover of the battery cell according to claim 1, characterized in that, Along the extension direction of the flow-limiting groove (30), both ends of the flow-limiting groove (30) extend to the edge of the cover body (10).
3. The cover of the battery cell according to claim 1, characterized in that, The flow limiting groove (30) has a bent groove section that protrudes toward the injection hole (11) along the arrangement direction of the electrode post (20) and the injection hole (11).
4. The battery cell cover of claim 3, wherein, Along the extension direction of the flow limiting groove (30), the bending groove section is formed at the middle position of the flow limiting groove (30).
5. The battery cell cover of claim 4, wherein, Along the arrangement direction of the electrode post (20) and the injection hole (11), the bent groove section is opposite to the injection hole (11).
6. The cover of the battery cell according to any one of claims 3-5, characterized in that, The flow-limiting groove (30) has an arc-shaped structure to form the bent groove section.
7. The battery cell cover of any one of claims 3-5, wherein, The flow-limiting groove (30) includes a first inclined groove section (31) and a second inclined groove section (32). The first inclined groove section (31) and the second inclined groove section (32) are arranged in a direction perpendicular to the arrangement direction of the electrode post (20) and the injection hole (11). The first inclined groove section (31) and the second inclined groove section (32) are bent and connected to form the bent groove section. From the first inclined groove section (31) to the second inclined groove section (32), the first inclined groove section (31) is inclined in a direction away from the electrode post (20), and the second inclined groove section (32) is inclined in a direction away from the injection hole (11).
8. The battery cell cover of claim 7, wherein, Both the first inclined groove segment (31) and the second inclined groove segment (32) are constructed as straight segments.
9. The battery cell cover of claim 7, wherein, An included angle β is formed between the first inclined groove segment (31) and the second inclined groove segment (32), satisfying the relationship: 45°≤β≤135°.
10. A battery cell characterized by, Includes the cover (1) of the battery cell according to any one of claims 1-9.