Battery cover plate and battery
By integrating a composite structure of temperature control spring and heat dissipation component, reversible temperature control protection of battery cover is achieved, solving the problems of lagging over-temperature protection and high maintenance costs of traditional battery cover, and improving safety and thermal management efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional battery covers cannot provide reversible temperature control protection when the battery cell malfunctions, resulting in delayed over-temperature protection and high maintenance costs.
Design a composite structure integrating a temperature control spring and a heat sink. The temperature control spring is made of bimetallic strip or shape memory alloy material. It achieves temperature threshold triggering through the warping action of the deformation end. It is insulated at room temperature, provides short circuit protection at high temperature, and achieves rapid heat conduction and heat dissipation through the heat sink.
It achieves reversible temperature control of the battery cover, avoiding leakage current and accidental short circuits, rapidly cooling down, reducing maintenance costs, and improving safety and thermal management efficiency.
Smart Images
Figure CN224036482U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a battery cover plate and battery. BACKGROUND
[0002] Lithium battery is widely used in various industries, 3C electronic field, new energy automobile field etc., and lithium battery has big safety problem because of its own characteristics, such as fire, explosion etc. Especially in the new energy automobile field, as the core power source of new energy automobile, how to guarantee high safety performance is the problem that relevant technical personnel is always trying to solve. The reliability of battery cover plate as the core component of battery assembly has huge influence on the performance and normal use of battery. The battery cover plate is usually composed of cover plate main body, pole post assembly, explosion-proof device etc., when the temperature of battery cell is abnormal and the internal pressure increases, usually rely on explosion-proof device or SSD structure in pole post assembly to carry out irreversible pressure relief and short circuit processing, to prevent battery cell out of control, because explosion-proof device or SSD structure in pole post assembly triggers self-destruction and is irreversible, leading to battery cover plate unable to continue to use, the replacement cost is higher, causing great waste. SUMMARY
[0003] In view of the above problems, the utility model aims at designing a battery cover plate and battery, the battery cover plate has reversible temperature control function, when the battery cell is abnormal and the temperature rises, the battery cover plate can carry out abnormal protection, after the battery cell is cooled, can restore original function state.
[0004] The utility model discloses the purpose that is realized through the following technical scheme:
[0005] Design a kind of battery cover plate, including the cover plate main body for covering the opening of battery shell one side, and first pole post assembly and second pole post assembly being set on the cover plate main body, the first pole post assembly includes first pole, first pole block, heat dissipation piece and temperature control spring, the heat dissipation piece is arranged between the cover plate main body and first pole block, the temperature control spring includes fixed end and deformation end, the fixed end is connected to the cover plate main body or first pole, in first state, the deformation end is suspended, in second state, the deformation end warps and contacts the first pole or cover plate main body, to make the first pole and the cover plate main body conductive connection.
[0006] The battery cover plate designed in the scheme realizes the coordinated improvement of safety, thermal management efficiency and functional intelligence through the composite structure of integrating the temperature control spring and the heat dissipation part. Specifically, the dynamic temperature control protection mechanism is realized through the temperature control spring, which can adopt bimetallic sheet or memory alloy material, and the temperature threshold triggering is realized through the warping action of the deformation end. In the first state, i.e. normal temperature state, the deformation end is suspended, the first pole and the cover plate body are insulated, and the leakage current or accidental short circuit is avoided. In the second state, i.e. when the temperature of the battery cell abnormally rises to the set threshold high temperature, the temperature control spring deforms due to heat, the deformation end contacts the first pole or the cover plate body, a low-resistance path is formed, the battery cell is short-circuited, and the thermal runaway of the battery cell is prevented. The rapid heat conduction and heat dissipation structure is realized by setting the heat dissipation part, which can adopt heat-conducting plastic or ceramic-based composite material, so as to ensure the insulation between the first pole and the cover plate body, and realize rapid heat conduction and heat dissipation. When the temperature of the battery cell drops to the set threshold low temperature, the temperature control spring restores, and the battery cell is in normal state. Through the above integrated design, the battery cover plate has reversible temperature control function, and the problems of traditional battery cover plate, such as over-temperature protection lag and high maintenance cost, are solved.
[0007] Further, the inner surface of the cover plate body towards the battery cell side is provided with a counterbore, and the temperature control spring is arranged in the counterbore, and the fixed end is connected to the inner wall of the counterbore.
[0008] By opening the counterbore on the cover plate body and embedding the temperature control spring therein, compared with the external convex spring layout, the space is saved, the structure of the cover plate body is more compact, and at the same time, the counterbore as an embedded cavity can effectively disperse the mechanical vibration stress by fixing the fixed end of the temperature control spring through the inner wall, so as to avoid displacement or fatigue fracture of the spring due to long-term vibration.
[0009] Further, the first pole includes a connecting block connected with the tab of the battery cell, and the side of the connecting block towards the cover plate body is attached to the inner surface of the cover plate body. In the second state, the deformation end warps to contact the connecting block.
[0010] The connecting block and the tab of the battery cell are connected by laser welding, which is stable and reliable. The projection of the connecting block on the cover plate body covers the position of the counterbore, i.e. when the temperature of the battery cell abnormally rises to the set threshold high temperature, the deformation end warps to contact the connecting block, realizing the conduction between the first pole and the cover plate body.
[0011] Further, the inner surface of the cover plate body is provided with a limiting protrusion which is annularly arranged around the connecting block.
[0012] The limiting protrusion forms a ring-shaped mechanical lock around the connecting block, limiting the radial displacement of the connecting block within a certain range, and at the same time avoiding the rotation of the first pole. When the first pole, the cover plate body and the first pole block are connected and assembled, the assembly precision can be improved, and the assembly failure can be reduced.
[0013] Further, the first pole post further comprises a post body, the cover plate body is provided with a first pole hole, and the post body is connected with the first pole block through the first pole hole.
[0014] The post body is riveted with the first pole block through the first pole hole, so that a stable connection structure is formed between the first pole post assembly and the cover plate body.
[0015] Further, the first pole post assembly further comprises a first sealing member sleeved on the post body.
[0016] The first sealing member is a sealing ring, which comprises an abutting portion and a sleeving portion connected with the abutting portion, the diameter of the abutting portion is greater than that of the first pole hole, and the diameter of the sleeving portion is smaller than that of the first pole hole. When the post body is connected with the first pole block through the first pole hole, the two sides of the abutting portion are tightly abutted with the cover plate body and the connecting block respectively, so that the first pole hole is closed and electrolyte leakage is avoided.
[0017] Further, the first pole post assembly further comprises a first insulator arranged between the first pole block and the cover plate body, and the first insulator insulates and separates the first pole block from the cover plate body.
[0018] By arranging the first insulator between the first pole block and the cover plate body, the insulation and separation between the first pole block and the cover plate body are realized, so that the contact between the first pole block and the cover plate body is avoided, and the internal positive and negative short circuit of the battery is avoided, which can cause heat runaway and even explosion. The first insulator is made of high-resistance material, such as polytetrafluoroethylene and modified rubber, which blocks the current conduction between the first pole block and the cover plate body, and ensures that the current only flows through the pole post-external circuit path.
[0019] Further, one side of the first insulator away from the cover plate body is provided with a groove, and the first pole block is embedded in the groove.
[0020] By arranging the groove, the axial alignment of the first pole block and the insulator is ensured, which is conducive to the riveting of the post body of the first pole post with the first pole block through the through hole at the bottom of the first insulator. At the same time, the first pole block is wrapped in the groove, which improves the insulation between the first pole block and the cover plate body.
[0021] Further, the heat dissipation member comprises a heat dissipation ring arranged around the outer periphery of the first insulator, and a heat conduction block arranged on the side of the heat dissipation ring close to the first insulator, and the heat conduction block is in contact with the first pole block through the first insulator.
[0022] The plurality of heat-conducting blocks are provided, the first insulator is provided with a plurality of accommodating cavities corresponding to the heat-conducting blocks, the heat-conducting blocks are embedded in the accommodating cavities, the lower surface of the heat-conducting blocks is flush with the bottom surface of the first insulator, and the upper surface of the heat-conducting blocks is flush with the bottom surface of the groove of the first insulator, so that the heat-conducting blocks and the bottom surface of the first pole block form good contact, and the heat of the first pole and the first pole block can be partially transmitted to the heat-dissipating ring through the heat-conducting blocks to be quickly released, thereby achieving rapid cooling.
[0023] The battery also includes a battery shell and a battery cell accommodated between the battery shell and the battery cover plate.
[0024] The battery also includes a battery shell and a battery cell accommodated between the battery shell and the battery cover plate.
[0025] Compared with the prior art, the battery cover plate has the following beneficial effects:
[0026] The battery cover plate designed in the scheme realizes the synergistic improvement of safety, thermal management efficiency and functional intelligence through the integrated composite structure of the temperature control spring plate and the heat dissipation piece. Specifically, the dynamic temperature control protection mechanism is realized through the temperature control spring plate, the temperature control spring plate can be made of bimetallic sheet or memory alloy material, and the temperature threshold triggering is realized through the warping action of the deformation end. In the first state, i.e. normal temperature state, the deformation end is suspended, the first pole and the cover plate body are insulated, and the leakage current or accidental short circuit is avoided. In the second state, i.e. when the temperature of the battery cell abnormally rises to the set threshold high temperature, the temperature control spring plate is deformed by heat, the deformation end contacts the first pole or the cover plate body, a low-resistance path is formed, the battery cell is short-circuited, and the battery cell is prevented from thermal runaway. The rapid heat conduction and heat dissipation structure is realized by arranging the heat dissipation piece, the heat dissipation piece can be made of heat-conducting plastic or ceramic matrix composite material, which can ensure the insulation between the first pole block and the cover plate body, and realize rapid heat conduction and heat dissipation. When the temperature of the battery cell drops to the set threshold low temperature, the temperature control spring plate restores to the normal state. Through the above integrated design, the battery cover plate has a reversible temperature control function, and the problems of over-temperature protection lag and high maintenance cost of the traditional battery cover plate are solved. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 It is an exploded view of the battery cover plate of an embodiment of the utility model.
[0028] Figure 2 It is a structure view of the bottom perspective of the battery cover plate of an embodiment of the utility model (without the first pole).
[0029] Figure 3 It is a top view of the battery cover plate of an embodiment of the utility model.
[0030] Figure 4 It is Figure 3Cross-sectional view at position A-A (first state).
[0031] Figure 5 For Figure 3 Cross-sectional view at position A-A (second state).
[0032] Illustration: 1, cover plate body; 11, counterbore; 12, limiting protrusion; 13, first pole hole; 2, first pole assembly; 21, first pole; 211, connecting block; 212, column body; 22, first pole block; 23, heat dissipation piece; 231, heat dissipation ring; 232, heat conduction block; 24, temperature control elastic sheet; 241, fixed end; 242, deformation end; 25, first sealing piece; 26, first insulator; 261, groove; 3, second pole assembly. DETAILED DESCRIPTION
[0033] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. Example one:
[0034] As Figure 1 shown, the present embodiment provides a battery cover plate, comprising a cover plate body 1 for covering the opening of the battery shell on one side, and a first pole assembly 2 and a second pole assembly 3 disposed on the cover plate body 1. The cover plate body 1 is composed of an aluminum sheet and a plastic part, specifically, the plastic part is similar in size and structure to the aluminum sheet, and can be fixedly connected together with the aluminum sheet by injection molding process. In the present application, the shape of the cover plate body is not specifically limited, which can be an exemplary regular shape such as a rectangle or a circle, or some possible irregular shape, which can be specifically designed according to the battery to which the cover plate is applied. The cover plate body 1 is provided with an explosion-proof structure at the middle position, and the first pole assembly 2 and the second pole assembly 3 are respectively located on both sides of the explosion-proof structure, the first pole assembly 2 comprises a first pole 21, a first pole block 22, a heat dissipation piece 23, a first insulator 26, and a temperature control elastic sheet 24.
[0035] As Figures 3 to 5As shown, the temperature control spring 24 includes a fixed end 241 and a deformation end 242, the fixed end 241 is connected to the cover plate body 1 or the first pole column 21. In this application, the inner surface of the cover plate body 1 towards the side of the battery cell is provided with a counterbore 11, two temperature control springs 24 are arranged in the counterbore 11, and the fixed end 241 is connected to the inner wall of the counterbore 11. By opening the counterbore 11 on the cover plate body 1, the temperature control spring 24 is embedded therein, compared with the convex spring layout, the space is saved, and the structure of the cover plate body 1 is more compact. At the same time, the counterbore 11 as an embedded cavity can effectively disperse mechanical vibration stress by fixing the fixed end 241 of the temperature control spring 24 on the inner wall, avoiding displacement or fatigue fracture of the spring due to long-term vibration. In other applications of this application, the fixed end 241 can also be fixedly connected to the first pole column 21. In the first state, i.e. normal temperature state, the deformation end 242 is suspended, the first pole column 21 is insulated from the cover plate body 1, avoiding leakage current or accidental short circuit. In the second state, i.e. when the battery cell is abnormal and the temperature rises to a set threshold high temperature, the temperature control spring 24 is deformed by heat, the deformation end 242 contacts the first pole column 21, forming a low resistance path, which short-circuits the battery cell and prevents thermal runaway of the battery cell.
[0036] As shown in Figure 1 and Figure 2 , the first pole column 21 includes a connecting block 211 connected to the battery cell tab, the connecting block 211 is attached to the inner surface of the cover plate body 1 on one side of the cover plate body 1. In the second state, the deformation end 242 is buckled to contact the connecting block. The connecting block 211 is connected to the battery cell tab by laser welding, the connection is stable and reliable, and the projection of the connecting block 211 on the cover plate body 1 covers the position of the counterbore 11, i.e. when the battery cell is abnormal and the temperature rises to a set threshold high temperature, the deformation end 242 buckles to contact the connecting block 211, realizing the conduction between the first pole column 21 and the cover plate body 1. The inner surface of the cover plate body 1 is provided with a limiting protrusion 12 which is annularly arranged around the connecting block 211. The limiting protrusion 12 forms an annular mechanical lock around the connecting block 211, limiting the radial displacement of the connecting block 211 within a certain range, while avoiding the rotation of the first pole column 21. When the first pole column 21, the cover plate body 1 and the first pole block 22 are connected and assembled, the assembly precision can be improved and assembly defects can be reduced. The first pole column 21 further includes a column body 212, the cover plate body 1 is provided with a first pole hole 13, and the column body 212 is riveted to the first pole block 22 through the first pole hole 13 to form a stable connection structure between the first pole column assembly 2 and the cover plate body 1. A first sealing member 25 is sleeved on the column body 212, the first sealing member 25 is a sealing ring, the sealing ring includes an abutting portion and a sleeving portion connected to the abutting portion, the diameter of the abutting portion is greater than the diameter of the first pole hole 13, and the diameter of the sleeving portion is less than the diameter of the first pole hole 13. When the column body 212 passes through the first pole hole 13 and is connected to the first pole block 22, the two sides of the abutting portion are tightly abutted against the cover plate body 1 and the connecting block 211 respectively, realizing the sealing of the first pole hole 13 and avoiding the leakage of electrolyte.
[0037] As Figure 1 shown, the first insulator 26 is arranged between the cover plate body 1 and the first pole block 22, and the first insulator 26 insulates and separates the first pole block 22 from the cover plate body 1. By arranging the first insulator 26 between the first pole block 22 and the cover plate body 1, the insulation and separation between the first pole block 22 and the cover plate body 1 is achieved, avoiding the contact between the first pole block 22 and the cover plate body 1, which leads to the short circuit of the positive and negative poles inside the battery, and causes thermal runaway or even explosion. The first insulator 26 is made of high-resistance material, such as polytetrafluoroethylene or modified rubber, which blocks the current conduction between the first pole block 22 and the cover plate body 1, and ensures that the current only flows through the pole column-external circuit path. The side of the first insulator 26 away from the cover plate body 1 is provided with a groove 261, and the first pole block 22 is embedded in the groove 261. By arranging the groove 261, the axial alignment of the first pole block 22 and the first insulator 26 is ensured, which is conducive to the riveting of the column body 212 of the first pole column 21 with the first pole block 22 through the through hole at the bottom of the first insulator 26, and at the same time, the first pole block 22 is wrapped in the groove, which improves the insulation between the first pole block 22 and the cover plate body 1.
[0038] As Figure 1 shown, the heat dissipation member 23 is also arranged between the cover plate body 1 and the first pole block 22, and the heat dissipation member 23 includes a heat dissipation ring 231 arranged around the outer periphery of the first insulator 26, and a heat conduction block 232 arranged on the side of the heat dissipation ring 231 close to the first insulator 26, and the heat conduction block 232 penetrates through the first insulator 26 and contacts the first pole block 22. The heat conduction block 232 is provided with a plurality of heat conduction blocks 232, and the first insulator 26 is provided with a plurality of accommodating cavities corresponding to the heat conduction blocks 232, and the heat conduction blocks 232 are embedded in the accommodating cavities, and the lower surface of the heat conduction block 232 is flush with the bottom surface of the first insulator 26, and the upper surface of the heat conduction block 232 is flush with the bottom surface of the groove 261 of the first insulator 26, so that the heat conduction block 232 and the bottom surface of the first pole block 22 form good contact, and part of the heat of the first pole column 21 and the first pole block 22 can be transmitted to the heat dissipation ring 231 through the heat conduction block 232 to be quickly released and dissipated, thereby achieving rapid cooling.
[0039] In addition, the structure of the second pole column assembly 3 can be the same as that of the first pole column assembly 2, or can be different from that of the first pole column assembly 2, i.e. the temperature control spring 24 and the heat dissipation member 23 can not be arranged, and the conduction between the second pole column assembly 3 and the cover plate body 1 can be realized by arranging a conductor. The connection mode between the second pole column assembly 3 and the cover plate body 1 is the same as that between the first pole column assembly 2 and the cover plate body 1, which will not be described here.
[0040] The battery cover plate of the embodiment realizes the synergistic promotion of safety, thermal management efficiency and functional intelligence through the composite structure of integrating the temperature control spring 24 and the heat dissipation piece 23. Specifically, the dynamic temperature control protection mechanism is realized through the temperature control spring 24, and the temperature control spring 24 can adopt a bimetallic strip or a memory alloy material, and the temperature threshold triggering is realized through the warping action of the deformation end 242. In the first state, that is, the normal temperature state, the deformation end 242 is suspended, the first pole 21 is insulated from the cover plate body 1, and the leakage current or accidental short circuit is avoided. In the second state, that is, when the battery cell is abnormal and the temperature rises to a set threshold high temperature, the temperature control spring 24 is deformed by heat, the deformation end 242 contacts the first pole or the cover plate body 1, a low-resistance path is formed, the battery cell is short-circuited, and the thermal runaway of the battery cell is prevented. The rapid heat conduction and heat dissipation structure is realized by arranging the heat dissipation piece 23, the heat dissipation piece 23 can adopt a heat-conducting plastic or a ceramic-based composite material, that is, the insulation between the first pole 22 and the cover plate body 1 is ensured, and rapid heat conduction and heat dissipation are realized. After the temperature of the battery cell drops to a set threshold low temperature, the temperature control spring 24 is restored, and the battery cell is in a normal state. Through the above integrated design, the battery cover plate has a reversible temperature control function, and the pain points of the traditional battery cover plate, such as over-temperature protection lag and high maintenance cost, are solved. Embodiment two:
[0041] The embodiment also provides a battery comprising the battery cover plate, a battery shell and a battery cell accommodated between the battery shell and the battery cover plate, the battery cover plate and the battery shell form an integral structure after laser welding, and the battery product can be formed after injecting electrolyte and activation.
[0042] In the description of the utility model, it is understood that the orientation or positional relationship indicated by terms such as 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer' and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0043] In addition, the terms 'first','second', and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by 'first','second' and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of 'a plurality of' is two or more, unless otherwise specifically limited.
[0044] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A battery cover, comprising a cover body for sealing an opening on one side of a battery casing, and a first terminal post assembly and a second terminal post assembly disposed on the cover body, characterized in that, The first electrode assembly includes a first electrode, a first electrode block, a heat sink, and a temperature control spring. The heat sink is disposed between the cover plate body and the first electrode block. The temperature control spring includes a fixed end and a deformable end. The fixed end is connected to the cover plate body or the first electrode. In a first state, the deformable end is suspended. In a second state, the deformable end is warped and contacts the first electrode or the cover plate body, so that the first electrode and the cover plate body are electrically connected.
2. The battery cover according to claim 1, characterized in that, The inner surface of the cover plate body facing the battery cell has a countersunk hole, the temperature control spring is located in the countersunk hole, and the fixed end is connected to the inner wall of the countersunk hole.
3. The battery cover according to claim 2, characterized in that, The first electrode post includes a connecting block that connects to the battery cell tab. The side of the connecting block facing the cover plate body is in contact with the inner surface of the cover plate body. In the second state, the deformed end warps and contacts the connecting block.
4. The battery cover according to claim 3, characterized in that, The inner surface of the cover plate body is provided with a limiting protrusion circumferentially arranged around the connecting block.
5. The battery cover according to claim 3, characterized in that, The first pole post also includes a column body, and the cover plate body is provided with a first pole hole. The column body passes through the first pole hole and is connected to the first pole block.
6. The battery cover according to claim 5, characterized in that, The first pole assembly further includes a first seal, which is sleeved on the pole body.
7. The battery cover according to claim 1, characterized in that, The first pole assembly further includes a first insulator disposed between the first pole block and the cover plate body, the first insulator insulating and isolating the first pole block from the cover plate body.
8. The battery cover according to claim 7, characterized in that, The first insulator has a groove on the side facing away from the cover plate body, and the first electrode block is embedded in the groove.
9. The battery cover according to claim 8, characterized in that, The heat sink includes a heat sink ring surrounding the outer periphery of the first insulator and a heat-conducting block disposed on the side of the heat sink ring near the first insulator, the heat-conducting block passing through the first insulator and contacting the first electrode block.
10. A battery, characterized in that, Includes the battery cover as described in any one of claims 1-9.