Battery cover plate and battery

Abstract

In order to solve the problem that the twisting resistance is obviously insufficient after the existing pole and the cover plate are mounted and matched, the utility model provides a battery cover plate, which comprises a cover plate assembly, a pole and a sealing element, the pole comprises a pole piece and a pole body, the pole body is connected to the pole piece and extends in the direction perpendicular to the plane where the pole piece is located, a first through hole is formed in the cover plate assembly, a second through hole is formed in the position, corresponding to the first through hole, of the sealing piece, the sealing piece is embedded into the first through hole, and the pole body is inserted into the second through hole. A first limiting part is arranged on the pole piece, a second limiting part is arranged on the cover plate assembly, and the first limiting part and the second limiting part form a first bonding structure; according to the application, the first bonding structure is formed by the second limiting part and the first limiting part, so that circumferential rotation of the cover plate assembly and the pole is avoided, a gap is not easy to appear between the pole and the cover plate assembly, the sealing performance of the pole is improved, and electrolyte is prevented from permeating through the gap.

Description

Technical Field

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

[0002] As the practical application of secondary batteries progresses, the requirements for improving various characteristics corresponding to their uses are further increased. For example, since the vertical part where the pole is connected to the cover plate is a cylindrical structure, this structure has obvious deficiencies in anti-torsion ability after being installed with the cover plate. If the anti-torsion ability of the pole is insufficient, it will cause safety problems such as the sealing of the connection between the pole and the cover plate to be destroyed, and the electrolyte in the battery housing will leak along the connection; secondly, the bottom end of the pole must be welded to the busbar of the battery cell, and the top end of the pole needs to be welded to the external connection bar. If the pole is movable, especially when used as a power battery, the vibration of the vehicle causes the pole to rotate through the connection bar, and long-term vibration will affect the stability of the electrical connection; therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Utility Model Content

[0003] Aiming at the problem that the anti-twisting ability of the current pole and the cover plate is obviously insufficient after being installed and matched, the utility model provides a battery cover plate and a battery.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] On the one hand, the utility model provides a battery cover, which is used to close a battery shell to form a battery, and the battery cover includes a cover assembly, a pole and a seal; the pole includes a pole sheet and a pole body, the pole body is connected to the pole sheet and extends in a direction perpendicular to the plane where the pole sheet is located, the cover assembly is provided with a first through hole, the seal is provided with a second through hole at a position corresponding to the first through hole, the seal is embedded in the first through hole, the pole body is inserted into the second through hole, the pole sheet is provided with a first limiting component, and the cover assembly is provided with a second limiting component on a side close to the pole sheet, the first limiting component and the second limiting component form a first bonding structure, and the first bonding structure prevents the cover assembly and the pole from circumferential rotation.

[0006] Optionally, the cover plate assembly includes a stacked lower plastic plate and a metal cover plate, the metal cover plate is provided with a third through hole, the lower plastic plate is provided with a fourth through hole at a position corresponding to the third through hole, the third through hole and the fourth through hole are interconnected to form the first through hole, a first groove is provided in the middle of the lower plastic plate, the opening of the first groove is closed by the metal cover plate, and a plurality of air-permeable liquid holes are provided at the bottom of the first groove.

[0007] Optionally, the first limiting component is provided on the outer periphery of the pole piece, a second groove is provided on the side of the lower plastic plate close to the pole piece, the second limiting component is provided in the second groove, the pole piece is embedded in the second groove, and the first limiting component and the second limiting component form the first bonding structure.

[0008] Optionally, a boss is provided on the side of the lower plastic plate close to the metal cover plate, a third limiting component is provided on the outer periphery of the boss, a third groove is provided on the side of the metal cover plate close to the lower plastic plate, a fourth limiting component is provided in the third groove, the boss is embedded in the third groove, and the third limiting component and the fourth limiting component form a second bonding structure.

[0009] Optionally, the first bonding structure and the second bonding structure each include a slot and a block, respectively, and the first limiting component and the second limiting component can interchangeably select any one of the slot and the block; the third limiting component and the fourth limiting component can interchangeably select any one of the slot and the block.

[0010] Optionally, the sealing member comprises a first sealing ring and a second sealing ring which are stacked, the first sealing ring being provided with a fifth through hole, the second sealing ring being provided with a sixth through hole at a position corresponding to the fifth through hole, the fifth through hole and the sixth through hole being interconnected to form the second through hole, the first sealing ring being located in the fourth through hole, and the second sealing ring being located in the third through hole.

[0011] Optionally, the cover plate assembly also includes an upper plastic plate and a pressure plate, the upper plastic plate has a seventh through hole at a position corresponding to the first through hole, the pressure plate has an eighth through hole at a position corresponding to the first through hole, and the pole is sequentially inserted into the second through hole, the seventh through hole and the eighth through hole.

[0012] Optionally, the upper plastic plate includes an abutment plate and a connector, the abutment plate is provided with a seventh through hole corresponding to the first through hole, the connector is connected to the outer periphery of the abutment plate, the connector extends in a direction perpendicular to the plane where the abutment plate is located, and the pressure plate is located between the abutment plate and the pole body.

[0013] Optionally, a liquid injection port and / or an explosion-proof valve is provided on the cover plate assembly.

[0014] Another aspect of the present invention provides a battery, which includes a battery housing and the battery cover as described above.

[0015] According to the battery cover provided by the utility model, a first bonding structure is formed by a second limiting component and a first limiting component arranged on the pole piece, thereby preventing the cover assembly and the pole from circumferential rotation, making it difficult for a gap to appear between the pole and the cover assembly, thereby improving the sealing of the pole and preventing the electrolyte from penetrating through the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a battery cover provided by an embodiment of the utility model;

[0017] Figure 2 It is a partial exploded schematic diagram of a battery cover provided by an embodiment of the utility model;

[0018] Figure 3 This is an exploded schematic diagram of a battery cover provided by an embodiment of the utility model;

[0019] Figure 4 It is a cross-sectional schematic diagram of a battery cover provided by an embodiment of the utility model;

[0020] Figure 5 This is a bottom view structural diagram of a metal cover provided by an embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the top view of the metal cover provided by one embodiment of the utility model;

[0022] Figure 7 This is a structural schematic diagram of a lower plastic plate provided by an embodiment of the utility model;

[0023] Figure 8 It is a schematic diagram of the structure of a pole provided by an embodiment of the utility model;

[0024] Fig. 9 It is a structural schematic diagram of a sealing member provided by an embodiment of the utility model;

[0025] Fig.10 This is a schematic diagram of the structure of an upper plastic plate provided by an embodiment of the utility model;

[0026] The reference numerals in the drawings of the specification are as follows:

[0027] 1-cover assembly; 11-first through hole; 12-metal cover; 121-third through hole; 122-third groove; 123-fourth limiting component; 124-liquid injection port; 125-explosion-proof valve; 13-lower plastic plate; 131-second limiting component; 132-fourth through hole; 133-second groove; 134-boss; 135-third limiting component; 136-first groove; 137-air-permeable liquid hole; 2-pole; 21-pole sheet; 22-pole body; 23-first limiting component; 3-seal; 31-second through hole; 32-first sealing ring; 321-fifth through hole; 33-second sealing ring; 331-sixth through hole; 4-upper plastic plate; 41-seventh through hole; 42-abutment plate; 43-connector; 5-pressing plate; 51-eighth through hole. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the present invention, it should be understood that the terms "side", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] On one hand, the utility model provides a battery cover, which is used to close a battery shell to form a battery, and the battery cover comprises a cover assembly 1, a pole 2 and a seal 3; the pole 2 comprises a pole sheet 21 and a pole body 22, the pole body 22 is connected to the pole sheet 21 and extends in a direction perpendicular to the plane where the pole sheet 21 is located, the cover assembly 1 is provided with a first through hole 11, the seal 3 is provided with a second through hole 31 at a position corresponding to the first through hole 11, the seal 3 is embedded in the first through hole 11, the pole body 22 is inserted into the second through hole 31, a first limiting component 23 is provided on the pole sheet 21, and a second limiting component 131 is provided on the side of the cover assembly 1 close to the pole sheet 21, the first limiting component 23 and the second limiting component 131 form a first bonding structure, and the first bonding structure prevents the cover assembly 1 and the pole 2 from circumferential rotation.

[0032] Specifically, the pole body 22 is square, cylindrical, prismatic or other irregular shapes; the second through hole 31 is square, cylindrical, prismatic or other irregular through holes; the shape of the second through hole 31 is the same as that of the pole body 22 .

[0033] Specifically, the first through hole 11 is a square through hole, a cylindrical through hole, a prismatic through hole or other irregular through holes; the external shape of the second through hole 31 is a square through hole, a cylindrical through hole, a prismatic through hole or other irregular through holes; the external shape of the second through hole 31 is the same as that of the first through hole 11.

[0034] The cover plate assembly 1 of the present application forms a first bonding structure with the first limiting component 23 provided on the pole piece 21 through the second limiting component 131, thereby preventing the cover plate assembly 1 and the pole 2 from circumferential rotation, making it difficult for a gap to appear between the pole 2 and the cover plate assembly 1, thereby improving the sealing of the pole 2 and preventing the electrolyte from penetrating through the gap.

[0035] By providing a first limiting component 23 on the pole piece 21 and a second limiting component 131 on the cover plate assembly 1, the first limiting component 23 and the second limiting component 131 form a first bonding structure, thereby avoiding the use of other additional fixing components or limiting components and reducing production costs.

[0036] like Figure 1-2As shown, in one embodiment, the cover plate assembly 1 includes a stacked lower plastic plate 13 and a metal cover plate 12, the metal cover plate 12 is provided with a third through hole 121, and the lower plastic plate 13 is provided with a fourth through hole 132 at a position corresponding to the third through hole 121, and the third through hole 121 and the fourth through hole 132 are interconnected to form the first through hole 11; a first groove 136 is provided in the middle of the lower plastic plate 13, the opening of the first groove 136 is closed by the metal cover plate 12, and a plurality of air-permeable liquid holes 137 are provided at the bottom of the first groove 136.

[0037] By disposing the lower plastic plate 13 below the metal cover plate 12 , a barrier effect is played on the battery cells. Since the metal cover plate 12 is made of metal material, the lower plastic plate 13 can play an insulating role to avoid electrical connection between the metal cover plate 12 and the battery cells.

[0038] Specifically, the material of the metal cover plate 12 can be aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys, or copper and its alloys as required.

[0039] Furthermore, the first groove 136 abuts against the surface of the battery cell to prevent the battery cell from moving. A plurality of air-permeable liquid holes 137 are provided at the bottom of the first groove 136. The first groove 136 has the function of storing a certain amount of electrolyte, thereby increasing the overall liquid retention of the battery. During the battery cycle, the electrolyte will be consumed to a certain extent. At this time, the electrolyte stored in the first groove 136 can be used to supplement the electrolyte loss caused by the battery cycle.

[0040] like Figure 1-2 As shown, in one embodiment, the first limiting component 23 is provided on the outer periphery of the pole piece 21, and the second groove 133 is provided on the side of the lower plastic plate 13 close to the pole piece 21, and the second limiting component 131 is provided in the second groove 133, and the pole piece 21 is embedded in the second groove 133, and the first limiting component 23 and the second limiting component 131 form the first bonding structure.

[0041] Specifically, a plurality of first limiting components 23 are provided, which are evenly distributed on the outer periphery of the pole piece 21; a plurality of second limiting components 131 are provided, which are evenly distributed on the inner side of the second groove 133; the first limiting components 23 provided on the outer periphery of the pole piece 21 and the second limiting components 131 provided in the second groove 133 are engaged one by one and used in combination.

[0042] It should be noted that the multiple mentioned in this application means greater than or equal to 2.

[0043] like Figure 1-2As shown, in one embodiment, a boss 134 is provided on one side of the lower plastic plate 13 close to the metal cover plate 12, a third limiting component 135 is provided on the periphery of the boss 134, a third groove 122 is provided on one side of the metal cover plate 12 close to the lower plastic plate 13, a fourth limiting component 123 is provided in the third groove 122, the boss 134 is embedded in the third groove 122, and the third limiting component 135 and the fourth limiting component 123 form a second bonding structure.

[0044] Specifically, a plurality of third limiting components 135 are provided, which are evenly distributed on the periphery of the boss 134; a plurality of fourth limiting components 123 are provided, which are evenly distributed on the inner side of the third groove 122; the third limiting components 135 provided on the periphery of the boss 134 are engaged with the fourth limiting components 123 provided in the third groove 122 one by one and are used in coordination.

[0045] Since a first bonding structure is formed between the pole piece 21 of the pole 2 and the lower plastic plate 13, and a second bonding structure is formed between the lower plastic plate 13 and the metal cover plate 12, relative rotation does not occur between the metal cover plate 12 and the pole 2, thereby avoiding rotation of the pole 2 and improving the stability of the electrical connection; in particular, when the battery is a power battery, the vibration of the vehicle causes the pole 2 to rotate through the connecting row, and long-term vibration will affect the stability of the electrical connection. The bonding structure can prevent relative rotation between the cover plate assembly 1 and the pole 2, thereby ensuring the stability of the battery electrical connection.

[0046] like Figure 1-2 As shown, in one embodiment, the first bonding structure and the second bonding structure both include a slot and a block, and the first limiting component 23 and the second limiting component 131 can interchangeably select any one of the slot and the block; the third limiting component 135 and the fourth limiting component 123 can interchangeably select any one of the slot and the block.

[0047] Specifically, the shapes of the card slot and the card block are adapted to limit the circumferential rotation of the pole 2 and the lower plastic plate 13, and also limit the displacement between the lower plastic plate 13 and the metal cover plate 12, thereby ensuring the stability of the battery electrical connection.

[0048] Specifically, the card block can be cylindrical, quadrangular, pentagonal, etc.; the card slot is a corresponding cylindrical groove, quadrilateral groove, pentagonal groove, etc., and the height of the card block and the depth of the card slot are the same, so that the card block is completely embedded in the card slot; the thickness of the pole piece 21 is the same as the depth of the second groove 133, the boss 134 and the third groove 122 are the same, the height of the card block and the depth of the card slot are less than or equal to the depth of the second groove 133 or the depth of the third groove 122; the card block and the card slot will not protrude from the second groove 133 or the third groove 122, so that the pole piece 21 is completely embedded in the second groove 133, the upper surface of the pole piece 21 is in contact with the lower surface of the lower plastic plate 13, so that the pole 2 and the lower plastic plate 13 will not move relative to each other; and, the upper surface of the lower plastic plate 13 is in contact with the lower surface of the metal cover plate 12, so that the lower plastic plate 13 and the metal cover plate 12 will not move relative to each other.

[0049] like Figure 1-2 As shown, in one embodiment, the sealing member 3 includes a first sealing ring 32 and a second sealing ring 33 which are stacked, the first sealing ring 32 being provided with a fifth through hole 321, the second sealing ring 33 being provided with a sixth through hole 331 at a position corresponding to the fifth through hole 321, the fifth through hole 321 and the sixth through hole 331 being interconnected to form the second through hole 31, the first sealing ring 32 being located in the fourth through hole 132, and the second sealing ring 33 being located in the third through hole 121.

[0050] Specifically, the first sealing ring 32 and the second sealing ring 33 are integrally formed by injection molding, the area of ​​the fourth through hole 132 is larger than the third through hole 121, and the center of the third through hole 121 and the fourth through hole 132 are coaxially arranged, the outer diameter of the first sealing ring 32 is the same as the diameter of the fourth through hole 132, the outer diameter of the second sealing ring 33 is the same as the diameter of the third through hole 121, the fifth through hole 321, the sixth through hole 331 and the pole body 22 have the same diameter, so that the pole body 22 passes through the fifth through hole 321, the sixth through hole 331 and is fixedly connected to the lower plastic plate 13 and the metal cover plate 12.

[0051] Furthermore, the thickness of the first sealing ring 32 is greater than the depth of the fourth through hole 132, the diameter of the first sealing ring 32 is smaller than the diameter of the fourth through hole 132, and the thickness of the second sealing ring 33 is equal to the depth of the third through hole 121. During installation, since the diameter of the first sealing ring 32 is smaller than the diameter of the fourth through hole 132, it is convenient to set the seal 3 in the fourth through hole 132, and then the fourth limiting component 123 of the metal cover plate 12 is fixedly connected to the third limiting component 135 of the lower plastic plate 13. Under the extrusion of the metal cover plate 12, the first sealing ring 32 is deformed, the thickness of the first sealing ring 32 becomes smaller, and the diameter becomes larger, so that it is tightly fitted with the inner wall of the third through hole 121 and the lower surface of the metal cover plate 12, and there is no gap, thereby improving the sealing of the pole 2 and preventing the electrolyte from penetrating through the gap.

[0052] like Figure 1-2 As shown, in one embodiment, the cover plate assembly 1 also includes an upper plastic plate 4 and a pressing plate 5, the upper plastic plate 4 is provided with a seventh through hole 41 at a position corresponding to the first through hole 11, the pressing plate 5 is provided with an eighth through hole 51 at a position corresponding to the first through hole 11, and the pole 2 is sequentially inserted into the second through hole 31, the seventh through hole 41 and the eighth through hole 51.

[0053] Specifically, the pole 2 is inserted into the second through hole 31, the seventh through hole 41 and the eighth through hole 51 in sequence, and the outer wall of the pole 2 and the inner wall of the pressure plate 5 are connected as a whole by welding; thereby, relative rotation does not occur between the cover plate assembly 1 and the pole 2, and a gap is not likely to appear between the pole 2 and the cover plate assembly 1, thereby improving the sealing of the pole 2 and preventing the electrolyte from penetrating through the gap.

[0054] like Figure 1-2 As shown, in one embodiment, the upper plastic plate 4 includes an abutment plate 42 and a connector 43, the abutment plate 42 is provided with a seventh through hole 41 corresponding to the first through hole 11, the connector 43 is connected to the outer periphery of the abutment plate 42, the connector 43 extends in a direction perpendicular to the plane where the abutment plate 42 is located, and the pressure plate 5 is located between the abutment plate 42 and the pole body 22.

[0055] Specifically, the pressing plate 5 is located above the abutting plate 42 and between the abutting plate 42 and the pole body 22 . The upper plastic plate 4 is made of insulating material to insulate the side of the pressing plate 5 .

[0056] like Figure 1-2 As shown, in one embodiment, a liquid injection port 124 and / or an explosion-proof valve 125 is provided on the cover plate assembly 1 .

[0057] Specifically, the injection port 124 is used to inject electrolyte into the battery. The electrolyte enters the inner cavity of the battery shell through the injection port 124. After the injection or formation is completed, the injection port 124 is closed. The closing method can be achieved by welding a cover plate or setting an openable cover plate.

[0058] Furthermore, the explosion-proof valve 125 and the air valve are located at the opening position of the first groove 136, which will generate a large amount of gas, forming a high pressure inside the battery. The gas enters the first groove 136 through the air-permeable liquid hole 137. When the internal pressure of the battery reaches the rated pressure of the explosion-proof valve 125, the explosion-proof valve 125 will rupture and release the pressure. At this time, it has a pressure relief effect on the battery, and ultimately avoids the battery from exploding due to excessive pressure.

[0059] Another aspect of the present invention provides a battery, which includes a battery housing and the battery cover as described above.

[0060] In some embodiments, the battery housing is a square housing, a cylindrical housing, a prismatic housing or other irregular housings.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: The battery cover is used to close the battery shell to form a battery, and the battery cover includes a cover assembly, a pole and a seal; the pole includes a pole sheet and a pole body, the pole body is connected to the pole sheet and extends in a direction perpendicular to the plane where the pole sheet is located, the cover assembly is provided with a first through hole, the seal is provided with a second through hole at a position corresponding to the first through hole, the seal is embedded in the first through hole, the pole body is inserted into the second through hole, the pole sheet is provided with a first limiting component, and the cover assembly is provided with a second limiting component on a side close to the pole sheet, the first limiting component and the second limiting component form a first bonding structure, and the first bonding structure prevents the cover assembly and the pole from circumferential rotation.

2. The battery cover according to claim 1, characterized in that: The cover plate assembly includes a stacked lower plastic plate and a metal cover plate, a third through hole is provided on the metal cover plate, a fourth through hole is provided on the lower plastic plate at a position corresponding to the third through hole, the third through hole and the fourth through hole are interconnected to form the first through hole, a first groove is provided in the middle of the lower plastic plate, an opening of the first groove is closed by the metal cover plate, and a plurality of air-permeable liquid holes are provided at the bottom of the first groove.

3. The battery cover according to claim 2, characterized in that: The first limiting component is arranged on the outer periphery of the pole piece, a second groove is arranged on the side of the lower plastic plate close to the pole piece, the second limiting component is arranged in the second groove, the pole piece is embedded in the second groove, and the first limiting component and the second limiting component form the first bonding structure.

4. The battery cover according to claim 3, characterized in that: A boss is provided on one side of the lower plastic plate close to the metal cover plate, a third limiting component is provided on the outer periphery of the boss, a third groove is provided on one side of the metal cover plate close to the lower plastic plate, a fourth limiting component is provided in the third groove, the boss is embedded in the third groove, and the third limiting component and the fourth limiting component form a second bonding structure.

5. The battery cover according to claim 4, characterized in that: The first bonding structure and the second bonding structure each include a slot and a block, respectively; the first limiting component and the second limiting component can interchangeably select any one of the slot and the block; the third limiting component and the fourth limiting component can interchangeably select any one of the slot and the block.

6. The battery cover according to claim 2, characterized in that: The sealing member includes a first sealing ring and a second sealing ring which are stacked, the first sealing ring being provided with a fifth through hole, the second sealing ring being provided with a sixth through hole at a position corresponding to the fifth through hole, the fifth through hole and the sixth through hole being interconnected to form the second through hole, the first sealing ring being located in the fourth through hole, and the second sealing ring being located in the third through hole.

7. The battery cover according to claim 1, characterized in that: The cover plate assembly also includes an upper plastic plate and a pressure plate. The upper plastic plate has a seventh through hole at a position corresponding to the first through hole. The pressure plate has an eighth through hole at a position corresponding to the first through hole. The pole is sequentially inserted into the second through hole, the seventh through hole and the eighth through hole.

8. The battery cover according to claim 7, characterized in that: The upper plastic plate includes an abutment plate and a connector, the abutment plate is provided with a seventh through hole corresponding to the first through hole, the connector is connected to the outer periphery of the abutment plate, the connector extends in a direction perpendicular to the plane where the abutment plate is located, and the pressure plate is located between the abutment plate and the pole body.

9. The battery cover according to claim 1, characterized in that: The cover plate assembly is provided with a liquid injection port and / or an explosion-proof valve.

10. A battery, characterized in that: The battery comprises a battery housing and a battery cover as described in any one of claims 1-9.

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