Battery cover plate structure and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate structure and a battery. The battery cover plate structure comprises a cover plate and an elastic assembly part, a connecting part is arranged on the cover plate; a liquid injection hole is formed in the connecting part in a penetrating manner; the elastic assembly part comprises an inner assembly part and a limiting assembly part; the inner assembling part is connected to the interior of the liquid injection hole in a sealed mode and penetrates through the bottom of the liquid injection hole to be connected with the limiting assembling part. A first groove is formed between the limiting assembly part and the inner assembly part; and the bottom of the connecting part is arranged in the first groove in a limiting manner. According to the utility model, the laser welding process can be reduced, and the sealing performance of the liquid injection hole after liquid injection is completed is ensured; and the use safety and stability can also be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate structure and a battery. Background Art

[0002] For the cover plate assembly of a battery, a liquid injection hole and an explosion-proof valve hole are usually arranged on the cover plate. The liquid injection hole is used for injecting electrolyte into the battery, and the explosion-proof valve hole is used for discharging the gas generated inside the battery to prevent the battery from exploding.

[0003] At present, the liquid injection hole and the explosion-proof valve of the cover plate are respectively and simultaneously arranged on the top cover. Therefore, the following problems will exist: 1. It not only affects the strength of the top cover but also requires a laser welding process in the battery cell assembly section to ensure the sealing performance of the liquid injection hole; 2. When the internal pressure of the battery cell increases, the rubber plug fixed in the liquid injection hole only by friction is prone to loosen, causing the battery cell to leak liquid; Therefore, the stability and safety of the existing battery cover plate structure in use are poor. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery cover plate structure aiming at the deficiencies of the prior art, which can solve the technical problems of poor stability and safety in the existing use.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A battery cover plate structure includes a cover plate and an elastic fitting; a connecting portion is provided on the cover plate; a liquid injection hole penetrates through the connecting portion; the elastic fitting includes an inner fitting portion and a limiting fitting portion; the inner fitting portion is hermetically connected to the inside of the liquid injection hole and passes through the bottom of the liquid injection hole to be connected to the limiting fitting portion; and a first groove is provided between the limiting fitting portion and the inner fitting portion; the bottom of the connecting portion is limitedly arranged inside the first groove.

[0007] Preferably: the projection of the inner fitting portion towards the liquid injection hole covers the liquid injection hole.

[0008] Preferably: the connecting portion includes a limiting section and an abutting section which are sequentially connected along the thickness direction of the cover plate; the inner fitting portion is limitedly connected inside the limiting section; the limiting fitting portion abuts against the bottom of the abutting section.

[0009] Preferably: the relationship between the length L4 of the cross-section of the limiting section and the length L5 of the cross-section of the abutting section satisfies: L5 > L4;

[0010] And / or, the relationship between the diameter L1 of the liquid injection hole located in the abutting section and the length L2 of the limiting fitting portion satisfies: L1 ≥ L2.

[0011] Preferably, at least one second groove is provided inside the connecting portion; the second groove is communicated with the liquid injection hole; and the inner assembly portion is hermetically connected to the inner wall of the second groove.

[0012] Preferably, the inner assembly portion includes at least one first connecting section and at least one second connecting section which are stacked in sequence; the first connecting section and the second connecting section are respectively connected to the inside of the second groove; and the second connecting section is connected to the limit assembly portion; the first connecting section is disposed at the entrance of the liquid injection hole.

[0013] Preferably, the relational expression between the length of the first connecting section and the length L7 of the second connecting section satisfies: L6 > L7.

[0014] Preferably, the cross-section of the limit assembly portion is an arc structure.

[0015] Preferably, the elastic fitting is selected from one of natural rubber, cis-butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber and silicone rubber.

[0016] The present utility model also discloses a battery, including a cover body, a housing and a battery cell body. The cover body is disposed on the housing; and an installation cavity is provided between the cover body and the housing; the battery cell body is disposed inside the installation cavity; and the cover body is the battery cover plate structure described above.

[0017] The beneficial effect of the present utility model is that, by hermetically assembling the inner assembly portion to the liquid injection hole and then combining the connecting portion to be limitedly disposed in the first groove between the limit assembly portion and the inner assembly portion, the elastic fitting can be hermetically assembled into the liquid injection hole, thereby reducing the laser welding process and ensuring the sealing performance after the liquid injection hole is filled with liquid; it can also achieve that when the pressure is too high, the gas rushes out of the liquid injection hole under the elastic action of the elastic fitting to achieve a pressure relief effect; thereby improving the safety and stability of use, as well as improving the convenience and efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will refer to the attached Figures 1 to 4 to describe the features, advantages and technical effects of the exemplary embodiments of the present utility model.

[0019] Figure 1 is a schematic structural diagram of a battery cover plate structure according to an embodiment of the present utility model;

[0020] Figure 2 is a schematic structural diagram of a battery cover plate structure according to an embodiment of the present utility model;

[0021] Figure 3 is a schematic structural diagram of a battery cover plate structure according to an embodiment of the present utility model;

[0022] Figure 4 The structural schematic diagram of a battery according to an embodiment of the present utility model.

[0023] In the figure: 1 - cover plate; 11 - connecting part; 111 - limiting section; 112 - abutting section; 12 - liquid injection hole; 13 - second groove; 2 - elastic fitting; 201 - first groove; 21 - inner fitting part; 211 - guiding arc surface; 212 - mounting block; 22 - limiting fitting part; 23 - connecting block; 24 - first connecting section; 25 - second connecting section; 200 - cover body; 300 - housing; 301 - mounting cavity; 400 - battery cell body. Detailed implementation manners

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0026] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or various situations exist alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0029] The following will be further described in detail with reference to the attached Figures 1 to 4 This utility model is further described in detail below, but it is not a limitation to this utility model.

[0030] As Figure 1 and 2 shown, in an embodiment of this utility model, the battery cover structure includes a cover 1 and an elastic fitting 2; a connection part 11 is provided on the cover 1; a liquid injection hole 12 penetrates through the connection part 11; the elastic fitting 2 includes an inner fitting part 21 and a limit fitting part 22; the inner fitting part 21 is hermetically connected to the inside of the liquid injection hole 12 and passes through the bottom of the liquid injection hole 12 to be connected to the limit fitting part 22; and a first groove 201 is provided between the limit fitting part 22 and the inner fitting part 21; the bottom of the connection part 11 is limitedly arranged inside the first groove 201.

[0031] The technical solution of this utility model can improve the hermetic assembly of the elastic fitting to the liquid injection hole by hermetically assembling the inner fitting part to the liquid injection hole and then combining the connection part being limitedly arranged in the first groove between the limit fitting part and the inner fitting part, thereby reducing the laser welding process and ensuring the sealing performance after the liquid injection hole is filled with liquid; it can also achieve that when the pressure is too high, the gas rushes out of the liquid injection hole under the elastic action of the elastic fitting to achieve a pressure relief effect; furthermore, it improves the safety and stability of use, as well as the convenience and efficiency of assembly.

[0032] Specifically, in some embodiments, the inner fitting part 21 and the limit fitting part 22 are integrally fixed and formed; and the elastic fitting 2 is selected from one of natural rubber, cis-butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber, and silicone rubber. That is to say, selecting one of natural rubber, cis-butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber, and silicone rubber with relatively higher elastic properties can effectively ensure the sealing performance, and can also achieve that when the internal pressure is too high, the gas is discharged out of the liquid injection hole 12 through the highly elastic elastic fitting 2.

[0033] Specifically, in some embodiments, as Figure 1 and 2As shown, the projection of the inner assembly part 21 towards the liquid injection hole 12 covers the liquid injection hole 12. That is to say, through the inner assembly part 21 with a relatively large covering area, the sealing performance of the battery cover plate structure can be effectively improved, and laser welding assembly is not required.

[0034] Specifically, in some embodiments, as Figure 1 and 2 shown, the connecting part 11 includes a limiting section 111 and an abutting section 112 that are sequentially connected along the thickness direction of the cover plate 1; the inner assembly part 21 is limited and connected inside the limiting section 111; the limiting assembly part 22 abuts against the bottom of the abutting section 112. Among them, as Figure 2 and 3 shown, the limiting section 111 is formed by laminating and connecting at least two L-shaped limiting blocks into one body; and the inner assembly part 21 is arranged between two adjacent L-shaped limiting blocks; the abutting section 112 is a straight abutting block; the bottom of the limiting section 111 protrudes towards the inside of the cover plate 1; the top of the limiting section 111 protrudes towards the outside of the cover plate 1. Among them, the thickness direction of the cover plate 1 is the height direction or the up and down direction. This structure can ensure the stability of the clamping installation of the inner assembly part 21 through the limiting effect of the L-shaped limiting blocks, thereby improving the overall stability in use and ensuring its sealing performance.

[0035] Specifically, in some embodiments, as Figure 4 shown, the relationship between the length L4 of the cross-section of the limiting section 111 and the length L5 of the cross-section of the abutting section 112 satisfies: L5 > L4. That is to say, by lengthening the abutting section at the bottom and the limiting assembly part 22 to form an inverted "I" structure, the abutting assembly area between the abutting section 112 and the limiting assembly part 22 can be increased and the size of the limiting assembly part 22 can be effectively shortened. On the premise of ensuring that the elastic fitting 2 can punch out the liquid injection hole 12, the assembly stability and sealing performance are improved.

[0036] Specifically, in some embodiments, as Figure 2 shown, the cross-section of the limiting assembly part 22 is an arc structure. Among them, the cross-section of the limiting assembly part 22 is preferably a quarter-circular arc structure. This structure can ensure the smoothness of the limiting assembly part 22 passing through the liquid injection hole 12 and ensure the assembly stability between the limiting assembly part 22 and the abutting section 112.

[0037] Specifically, in some embodiments, as Figure 2 shown, the relationship between the diameter L1 of the liquid injection hole 12 located at the abutting section 112 and the length L2 of the limiting assembly part 22 satisfies: L1 ≥ L2. Preferably, L1 = L2. This structure can better improve the smoothness of the limiting assembly part 22 passing through the liquid injection hole 12 and ensure the assembly stability between the limiting assembly part 22 and the abutting section 112.

[0038] Specifically, in some embodiments, as Figure 1 and 2 shown, at least one second groove 13 is provided inside the connecting portion 11; the second groove 13 is communicated with the liquid injection hole 12; and the inner fitting portion 21 is hermetically connected to the inner wall of the second groove 13. Wherein, the through-hole direction of the second groove 13 is perpendicular to the through-hole direction of the liquid injection hole 12; the outer surface of the inner fitting portion 21 is closely attached to the inner wall of the second groove 13; further, the second groove 13 is provided inside the limiting section 111. This structure can further improve the sealing performance and ensure the stability and safety of its use.

[0039] Specifically, in some embodiments, as Figure 2 and 3 shown, the inner fitting portion 21 includes at least one first connection section 24 and at least one second connection section 25 which are stacked in sequence; the first connection section 24 and the second connection section 25 are respectively connected to the inside of different second grooves 13; and the second connection section 25 is connected to the limiting fitting portion 22; the first connection section 24 is provided at the entrance of the liquid injection hole 12. Wherein, in some embodiments, the number of the first connection sections 24 and the second connection sections 25 is at least two, and all the first connection sections 24 are stacked and connected into one body by the common mounting block 212; one of the first connection sections 24 is connected to one of the second connection sections 25 by the mounting block 212; all the second connection sections 25 are stacked and connected into one body by the common mounting block 212; the second connection section 25 is connected to the limiting fitting portion 22 by the connection block 23. In some other embodiments, as Figure 2 shown, the number of the first connection section 24 and the second connection section 25 is one; and the first connection section 24 is provided above the second connection section 25; and the first connection section 24 is connected to the second connection section 25 by the mounting block 212; the second connection section 25 is connected to the limiting fitting portion 22 by the connection block 23.

[0040] Specifically, in some embodiments, as Figure 3 shown, the relationship between the length L6 of the first connection section 24 and the length L7 of the second connection section 25 satisfies: L6 > L7. By combining the first connection section 24 with a longer length above and the second connection section 25 with a shorter length below, the assembly convenience can be effectively improved, and it is ensured that when the internal pressure is too high, the gas can quickly pass through the highly elastic elastic fitting 2 and be discharged outside the liquid injection hole 12.

[0041] Specifically, in some embodiments, as Figure 4As shown in the figure, a guiding arc surface 211 is provided at one end of the inner assembly part 21 facing the second groove 13; and the guiding arc surface 211 is convexly arranged in an arc shape facing the second groove 13. Among them, the guiding arc surface 211 is a semi-circular arc surface. This structure can facilitate the assembly through the semi-circular arc surface, and ensure that when the internal pressure is too high, the gas can quickly pass through the highly elastic elastic fitting 2 and be discharged outside the liquid injection hole 12.

[0042] Assembly method: Insert one side of the arc-shaped limiting assembly part 22 of the elastic fitting 2 into the liquid injection hole 12 towards the right; a part of the inner assembly part 21 of the elastic fitting 2 enters the tenon structure area of the connecting part 11 under the action of an external force due to its high elasticity; then, after rotating the arc-shaped limiting assembly part 22 of the elastic fitting 2 by 180°, the arc-shaped limiting assembly part 22 moves to the limiting assembly part 22 of the connecting part 11 and is fixed.

[0043] When the internal gas pressure increases, a part of the highly elastic inverted "I"-shaped inner assembly part 21 will deform under the action of pressure; thus, the gas can be released, playing the role of an explosion-proof valve.

[0044] The present utility model also proposes a battery, as Figure 4 shown in the figure, the battery includes a cover body 200, a housing 300 and a battery cell body 400, the cover body 200 is arranged on the housing 300; and an installation cavity 301 is provided between the cover body 200 and the housing 300; the battery cell body 400 is arranged inside the installation cavity 301; the cover body 200 is a battery cover plate structure; the specific structure of this battery cover plate structure refers to the above-mentioned embodiments. Since the cover body 200 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.

[0045] Among them, the battery cell body 400 mainly works by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive coating area and a positive tab connected to the positive coating area, the positive coating area is coated with the positive active material layer, and the positive tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative coating area and a negative tab connected to the negative coating area, the negative coating area is coated with the negative active material layer, and the negative tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0046] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0047] According to the disclosure and teaching of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments, and any obvious improvements, substitutions or variations made by those skilled in the art based on the present invention all belong to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A battery cover structure, characterized in that: It includes a cover plate and an elastic assembly part; a connecting part is provided on the cover plate; a liquid injection hole is penetrated in the connecting part; the elastic assembly part includes an inner assembly part and a limit assembly part; the inner assembly part is sealed and connected to the inside of the liquid injection hole, and passes through the bottom of the liquid injection hole to be connected to the limit assembly part; and a first groove is provided between the limit assembly part and the inner assembly part; the bottom limit of the connecting part is set inside the first groove.

2. The battery cover structure according to claim 1, characterized in that: The projection of the inner assembly portion toward the liquid injection hole covers the liquid injection hole.

3. The battery cover structure according to claim 1, characterized in that: The connecting portion comprises a limiting section and an abutting section which are sequentially connected along the thickness direction of the cover plate; the inner assembly portion is limitedly connected to the inside of the limiting section; and the limiting assembly portion abuts against the bottom of the abutting section.

4. The battery cover structure according to claim 3, characterized in that: The relationship between the length L4 of the cross section of the limiting section and the length L5 of the cross section of the abutting section satisfies: L5>L4; And / or, the relationship between the diameter L1 of the injection hole located in the abutting section and the length L2 of the position limiting assembly portion satisfies: L1≥L2.

5. The battery cover structure according to claim 1 or 3, characterized in that: At least one second groove is provided inside the connecting portion; the second groove is communicated with the liquid injection hole; and the inner assembly portion is sealed and connected to the inner wall of the second groove.

6. The battery cover structure according to claim 5, characterized in that: The inner assembly part includes at least one first connecting section and at least one second connecting section which are stacked in sequence; the first connecting section and the second connecting section are respectively connected to the inside of the second groove; and the second connecting section is connected to the limiting assembly part; the first connecting section is arranged at the entrance of the injection hole.

7. The battery cover structure according to claim 6, characterized in that: The relationship between the length of the first connecting segment and the length L7 of the second connecting segment satisfies: L6>L7.

8. The battery cover structure according to claim 1, characterized in that: The cross section of the position limiting assembly portion is an arc-shaped structure.

9. The battery cover structure according to claim 1, characterized in that: The elastic assembly part is selected from one of natural rubber, butadiene rubber, styrene-butadiene rubber, hexamethylene-propylene rubber and silicone rubber.

10. A battery, characterized in that: It includes a cover body, a shell and a battery cell body, wherein the cover body is arranged on the shell; and an installation cavity is provided between the cover body and the shell; the battery cell body is arranged inside the installation cavity; the cover body is the battery cover plate structure as described in any one of claims 1 to 9 above.

Images