Battery top cover assembly, battery and power device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery top cover assembly, a battery and a power device. The battery top cover assembly comprises a cover plate and an insulating part, the cover plate is provided with a pole; the insulating part is of a flat plate structure, a first avoiding hole is formed in the position, corresponding to the pole, of the insulating part, one end of the pole penetrates through the first avoiding hole, and the pole is suitable for being conductively connected with a pole lug of a pole group; the peripheral edge of the insulating part is recessed from the peripheral edge of the cover plate to form a step structure. According to the battery top cover assembly provided by the utility model, the insulating part is of a flat plate structure, the structure is simple, the processing is easy, the battery top cover assembly can be quickly obtained only through die cutting, the processing technology is simple, and the cost is low. As the peripheral edge of the insulating part is sunken in the peripheral edge of the cover plate to form a step structure, when the cover plate and the shell of the battery are welded, the insulating part is prevented from being scalded and warped, or welding laser is prevented from leaking into the interior to sweep the insulating part, and the insulating part is prevented from being burnt.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. Therefore, simplifying the battery structure and reducing costs have become development trends.

[0003] As an accessory in lithium-ion batteries, the lithium battery top cover firstly isolates the internal and external environments by welding with the battery shell, thus playing a sealing role. Secondly, it connects the internal and external circuits, and transmits the internal current of the battery to the outside through the top cover pole, thus playing a guiding role.

[0004] The top cover includes a plain aluminum sheet and a lower plastic. In the top cover with a circular pole currently on the market, the lower plastic has a complex structure and a high development cost. When the top cover is welded to the shell, the lower plastic is easily deformed and warped. Utility Model Content

[0005] In view of this, the utility model provides a battery top cover assembly, a battery and a power device to solve the problem of complex lower plastic structure of the existing top cover and complex assembly process with the bare aluminum sheet resulting in high cost.

[0006] In the first aspect, the utility model provides a battery top cover assembly, including a cover plate and an insulating member. The cover plate is provided with a pole; the insulating member is a flat plate structure, and a first avoidance hole is provided on the insulating member at a position corresponding to the pole, one end of the pole passes through the first avoidance hole, and the pole is suitable for conductive connection with the pole lug of the pole group; the four peripheral edges of the insulating member are recessed in the four peripheral edges of the cover plate to form a step structure.

[0007] Beneficial effects: The battery top cover assembly provided by the utility model has an insulating part of a flat plate structure, which is simple in structure and easy to process. It can be quickly obtained by die cutting, and the processing technology is simple and the cost is low. Since the first avoidance hole is provided at the position corresponding to the pole on the insulating part, the pole can be conductively connected to the pole ear of the pole group. Since the four edges of the insulating part are recessed in the four edges of the cover plate to form a step structure, when the cover plate and the battery shell are welded, the insulating part is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating part, causing the insulating part to burn.

[0008] In an optional implementation, the distance between the edge around the insulating member and the edge around the cover plate is L, and L is ≥ 0.5 mm.

[0009] Beneficial effect: By controlling the distance between the edges around the insulating part and the edges around the cover plate to be greater than 0.5 mm, it can be ensured that when the cover plate and the battery shell are welded, the insulating part is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating part, causing burns to the insulating part.

[0010] In an optional implementation, the thickness of the insulating member is h, 0.3 mm≤h≤3 mm.

[0011] Beneficial effect: By controlling the thickness h of the insulating part within the above range, the strength of the insulating part and the ability of the insulating part to withstand voltage can be ensured to prevent voltage breakdown, while preventing the thickness from being too thick and causing difficulties in die cutting.

[0012] In an optional embodiment, the insulating member is adhesively connected to the cover plate.

[0013] Beneficial effect: Since the insulating member and the cover plate are connected by gluing, compared with the traditional method of hot melting or clamping, the gluing connection is more convenient and quicker, and can effectively improve the connection speed between the insulating member and the cover plate.

[0014] In an optional embodiment, an explosion-proof valve is further included. The explosion-proof valve is arranged on the cover plate, and an exhaust passage suitable for connecting the interior of the battery cell with the explosion-proof valve is arranged at a position of the insulating member corresponding to the explosion-proof valve.

[0015] Beneficial effect: By setting an exhaust channel at a position on the insulating part corresponding to the explosion-proof valve, the interior of the battery cell can be connected to the explosion-proof valve. When thermal runaway occurs inside the battery and high-pressure gas is generated, the high-pressure gas can smoothly reach the explosion-proof valve from the exhaust channel, so that the explosion-proof valve opens to release pressure, thereby ensuring the safety of the battery.

[0016] In an optional embodiment, the exhaust passage includes a plurality of through holes provided in the insulating member.

[0017] Beneficial effect: By setting the through hole, it is easy to process and can form an exhaust channel, so that when high-pressure gas is generated in the battery, the gas can reach the explosion-proof valve through the through hole.

[0018] In an optional embodiment, the through hole is an arc-shaped long strip hole, a plurality of through holes are provided, and the through holes are spaced around the boundary of the explosion-proof valve.

[0019] Beneficial effect: A plurality of long holes arranged at intervals are arranged at intervals around the boundary of the explosion-proof valve to form a circle of discontinuous annular exhaust channels, so that the high-pressure gas in the battery can directly reach the explosion-proof valve.

[0020] In an optional embodiment, the cover plate is provided with a liquid injection hole, and the insulating member is provided with a second avoidance hole at a position corresponding to the liquid injection hole.

[0021] Beneficial effect: A second avoidance hole is arranged on the insulating member at a position corresponding to the injection hole, so that electrolyte can be injected into the battery through the injection hole on the cover plate.

[0022] In a second aspect, the utility model further provides a battery, comprising a shell, a pole group, and a battery top cover assembly of any one of the above technical solutions. The shell comprises an inner cavity with an open end; the pole group is arranged in the inner cavity of the shell; the battery top cover assembly is arranged at the open end of the shell, encapsulating the pole group inside, the insulating member of the battery top cover assembly abuts against the pole group, and one end of the pole column of the battery top cover assembly close to the pole group is conductively connected to the pole ear of the pole group.

[0023] Beneficial effects: The battery provided by the utility model includes the battery top cover assembly of the above-mentioned implementation scheme. Since the insulating member of the battery top cover assembly is a flat plate structure, the structure is simple and easy to process. It can be quickly obtained by die cutting, and the processing technology is simple and the cost is low. Since the first avoidance hole is provided at the position corresponding to the pole on the insulating member, the pole can be conductively connected to the pole ear of the pole group. Since the four edges of the insulating member are recessed in the four edges of the cover plate to form a step structure, when the cover plate and the battery shell are welded, the insulating member is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating member, causing the insulating member to burn.

[0024] In a third aspect, the utility model also provides a power device, comprising the battery in the above technical solution.

[0025] Beneficial effect: Since the power device includes a battery, it has the same effect as the battery and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a battery top cover assembly according to an embodiment of the utility model;

[0028] Figure 2 for Figure 1 A structural exploded view of a cover plate and an insulating member in a battery top cover assembly from a first perspective;

[0029] Figure 3 for Figure 1 A structural exploded view of a cover plate and an insulating member in a battery top cover assembly from a second perspective;

[0030] Figure 4for Figure 1 The structural exploded view of the battery top cover assembly shown;

[0031] Figure 5 This is a schematic diagram of the structure of a battery according to an embodiment of the utility model;

[0032] Figure 6 for Figure 5 A top view of the battery shown;

[0033] Figure 7 For along Figure 6 Sectional view at AA in the middle;

[0034] Figure 8 for Figure 7 A partial enlarged view of point B in the middle.

[0035] Description of reference numerals:

[0036] 1. Cover plate; 11. First mounting hole; 12. Second mounting hole; 13. Liquid injection hole; 2. Insulator; 21. First avoidance hole; 22. Second avoidance hole; 23. Exhaust channel; 3. Pole; 4. Explosion-proof valve; 5. Explosion-proof valve patch; 6. Pole group; 61. Pole ear; 7. Shell; 8. Sealing ring; 9. Insulating rubber ring; 10. Battery top cover assembly; 100. Battery. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0038] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.

[0039] According to an embodiment of the utility model, in a first aspect, a battery top cover assembly 10 is provided, comprising a cover plate 1 and an insulating member 2. The cover plate 1 is provided with a pole 3; the insulating member 2 is a flat plate structure, and a first avoidance hole 21 is provided on the insulating member 2 at a position corresponding to the pole 3, one end of the pole 3 passes through the first avoidance hole 21, and the pole 3 is suitable for conductive connection with the pole ear 61 of the pole group 6; the four peripheral edges of the insulating member 2 are recessed in the four peripheral edges of the cover plate 1 to form a step structure.

[0040] The battery top cover assembly 10 provided in this embodiment has an insulating member 2 of a flat plate structure, which is simple in structure, easy to process, and highly reliable. It can be quickly obtained by die cutting, and has a simple processing technology and low cost. Since the first avoidance hole 21 is provided at the position corresponding to the pole 3 on the insulating member 2, the pole 3 can be conductively connected to the pole lug 61 of the pole group 6; at the same time, the first avoidance hole 21 can also serve as a connection between the pole 3 and the cover plate 1 and the pole lug 61 to play a positioning role. Since the four edges of the insulating member 2 are recessed in the four edges of the cover plate 1 to form a step structure, when the cover plate 1 and the shell 7 of the battery 100 are welded, the insulating member 2 is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating member 2, causing the insulating member 2 to burn. When the insulating member 2 and the cover plate 1 are connected by gluing, it can also prevent the laser from leaking into the interior and scanning the insulating member 2 to cause the glue to explode.

[0041] Specifically, the cover plate 1 includes a plain aluminum sheet. The insulating member 2 includes a lower plastic, which is die-cut from a plate made of an electrolyte-resistant material such as PP or PI, and is easy to process and has low cost. Among them, the main function of the insulating member 2 is to prevent the pole ear 61 from contacting the cover plate 1, causing the pole group 6 to form a current path with the cover plate 1 and the shell 7. Two pole ears 61 are provided on the end face of the pole group 6 close to the cover plate 1, which are respectively a positive pole ear and a negative pole ear. Correspondingly, two pole posts 3 are provided on the cover plate 1, which are respectively a positive pole post and a negative pole post. When the pole ears 61 on both sides are overlapped with the cover plate 1 at the same time, a short circuit of the battery 100 will be formed. Therefore, the insulating member 2 plays an insulating role between the cover plate 1 and the pole group 6.

[0042] In one embodiment, Figure 8 As shown, the distance between the edge around the insulating member 2 and the edge around the cover plate 1 is L, and L≥0.5 mm.

[0043] By controlling the distance between the edges around the insulating part 2 and the edges around the cover plate 1 to be greater than 0.5 mm, it can be ensured that when the cover plate 1 and the shell 7 of the battery 100 are welded, the insulating part 2 is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating part 2, causing the insulating part 2 to be burned.

[0044] In one embodiment, Figure 8 As shown, the thickness of the insulating member 2 is h, 0.3 mm ≤ h ≤ 3 mm.

[0045] By controlling the thickness h of the insulating member 2 within the above range, the strength of the insulating member 2 and the ability of the insulating member to withstand voltage can be ensured to prevent voltage breakdown, while preventing the insulating member 2 from being too thick and causing difficulties in die-cutting.

[0046] In the battery 100 of the related art, the lower plastic and the bare aluminum sheet are usually connected by means of clamping, hot melting, etc., which is troublesome to assemble and has a complicated process, resulting in a high cost of top cover assembly in the production line. In order to further solve this problem, in one embodiment of the utility model, the insulating member 2 is connected to the cover plate 1 by adhesive bonding.

[0047] Specifically, the insulating part 2 and the cover plate 1 are bonded with 3M electrolyte-resistant glue. Compared with the traditional hot-melt or clamping method, the cover plate 1 and the insulating part 2 in this embodiment are positioned by the production line, and the adhesive connection is more convenient and quick, which can effectively improve the connection speed between the insulating part 2 and the cover plate 1 and reduce the assembly cost of the battery top cover assembly 10.

[0048] In one embodiment, an explosion-proof valve 4 is further included. The explosion-proof valve 4 is arranged on the cover plate 1 , and an exhaust channel 23 suitable for connecting the inside of the battery cell with the explosion-proof valve 4 is arranged at a position of the insulating member 2 corresponding to the explosion-proof valve 4 .

[0049] By providing an exhaust channel 23 at a position on the insulating member 2 corresponding to the explosion-proof valve 4, the interior of the battery cell can be connected to the explosion-proof valve 4. When thermal runaway occurs inside the battery 100 and high-pressure gas is generated, the exhaust channel 23 can smoothly reach the explosion-proof valve 4, so that the explosion-proof valve 4 opens to release pressure, thereby ensuring the safety of the battery 100.

[0050] In one embodiment, the exhaust passage 23 includes a plurality of through holes disposed in the insulating member 2 .

[0051] The through hole is provided to facilitate processing and form an exhaust channel 23 , so that when high-pressure gas is generated in the battery 100 , the gas can pass through the through hole to reach the explosion-proof valve 4 .

[0052] In one embodiment, the through hole is an arc-shaped long hole, a plurality of through holes are provided, and the through holes are arranged at intervals around the boundary of the explosion-proof valve 4 .

[0053] A plurality of long holes arranged at intervals are arranged at intervals around the boundary of the explosion-proof valve 4 to form a circle of discontinuous annular exhaust passages 23, so that the air pressure in the battery 100 is transmitted to the explosion-proof valve 4 in time, ensuring that the explosion-proof valve 4 explodes and releases pressure normally.

[0054] In one embodiment, the cover plate 1 is provided with a liquid injection hole 13 , and the insulating member 2 is provided with a second avoidance hole 22 at a position corresponding to the liquid injection hole 13 .

[0055] A second avoidance hole 22 is provided on the insulating member 2 at a position corresponding to the injection hole 13 , so that electrolyte can be injected into the battery 100 through the injection hole 13 on the cover plate 1 .

[0056] In one embodiment, the cover plate 1 is provided with a first mounting hole 11, and the pole 3 is provided in the first mounting hole 11. A sealing ring 8 is provided in the first mounting hole 11, and an insulating rubber ring 9 is coated on the outer periphery of the pole 3. The pole 3 and the cover plate 1 are mainly connected in a sealed insulation manner through the insulating rubber ring 9 and the sealing ring 8 of the pole 3.

[0057] In one embodiment, a second mounting hole 12 is provided on the cover plate 1 , and the explosion-proof valve 4 is provided in the second mounting hole 12 .

[0058] In one embodiment, an explosion-proof valve patch 5 is provided on the explosion-proof valve 4 of the cover plate 1 .

[0059] According to an embodiment of the utility model, in a second aspect, a battery 100 is further provided, comprising a housing 7, a pole group 6, and a battery top cover assembly 10 of any one of the above technical solutions. The housing 7 comprises an inner cavity with an open end; the pole group 6 is arranged in the inner cavity of the housing 7; the battery top cover assembly 10 is arranged at the open end of the housing 7, encapsulating the pole group 6 therein, the insulating member 2 of the battery top cover assembly 10 abuts against the pole group 6, and the end of the pole column 3 of the battery top cover assembly 10 close to the pole group 6 is conductively connected to the pole ear 61 of the pole group 6.

[0060] The battery 100 provided in this embodiment includes the battery top cover assembly 10 of the above embodiment. Since the insulating member 2 of the battery top cover assembly 10 is a flat plate structure, the structure is simple and easy to process. It can be quickly obtained by die cutting, and the processing technology is simple and the cost is low. Since the first avoidance hole 21 is provided at the position corresponding to the pole 3 on the insulating member 2, the pole 3 can be conductively connected to the pole ear 61 of the pole group 6. Since the four edges of the insulating member 2 are recessed in the four edges of the cover plate 1 to form a step structure, when the cover plate 1 and the shell 7 of the battery 100 are welded, the insulating member 2 is prevented from being burned and warped, or the welding laser leaks into the interior and scans the insulating member 2, causing the insulating member 2 to burn.

[0061] During specific assembly, the electrode group 6 is welded to the pole 3 of the cover plate 1 through the pole ear 61 to achieve conductive connection. After the electrode group 6 and the pole 3 of the cover plate 1 are welded and fixed, an insulating tape is wrapped around the outside of the electrode group 6, and then the housing 7 is installed. The housing 7 is welded with the battery top cover assembly 10 to seal the electrode group 6 inside the housing 7.

[0062] According to an embodiment of the present utility model, in a third aspect, a power device is also provided, comprising the battery 100 in the above technical solution.

[0063] Since the power device adopted in this embodiment includes the battery 100 of the above embodiment, it has the same effect as the battery 100 and will not be described in detail here.

[0064] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery top cover assembly, characterized in that: include: A cover plate, wherein the cover plate is provided with a pole; The insulating member is a flat plate structure, a first avoidance hole is provided on the insulating member at a position corresponding to the pole, one end of the pole passes through the first avoidance hole, and the pole is suitable for conductive connection with the pole ear of the pole group; the four peripheral edges of the insulating member are recessed in the four peripheral edges of the cover plate to form a step structure.

2. The battery top cover assembly according to claim 1, characterized in that: The distance between the edge around the insulating member and the edge around the cover plate is L, and L is ≥ 0.5 mm.

3. The battery top cover assembly according to claim 1 or 2, characterized in that: The thickness of the insulating member is h, 0.3 mm ≤ h ≤ 3 mm.

4. The battery top cover assembly according to claim 1 or 2, characterized in that: The insulating member is connected to the cover plate by gluing.

5. The battery top cover assembly according to claim 1 or 2, characterized in that: It also includes an explosion-proof valve, which is arranged on the cover plate, and the insulating member is provided with an exhaust channel suitable for connecting the inside of the battery cell with the explosion-proof valve at a position corresponding to the explosion-proof valve.

6. The battery top cover assembly according to claim 5, characterized in that: The exhaust passage includes a plurality of through holes arranged on the insulating member.

7. The battery top cover assembly according to claim 6, characterized in that: The through hole is an arc-shaped long strip hole, a plurality of the through holes are provided, and the through holes are arranged at intervals around the boundary of the explosion-proof valve.

8. The battery top cover assembly according to claim 1 or 2, characterized in that: The cover plate is provided with a liquid injection hole, and the insulating member is provided with a second avoidance hole at a position corresponding to the liquid injection hole.

9. A battery, characterized in that: include: a housing including an interior cavity having an open end; A pole group, the pole group is arranged in the inner cavity of the shell; The battery top cover assembly according to any one of claims 1 to 8, wherein the battery top cover assembly is arranged at the open end of the shell to encapsulate the electrode group therein, the insulating member of the battery top cover assembly abuts against the electrode group, and one end of the electrode column of the battery top cover assembly close to the electrode group is conductively connected to the electrode ear of the electrode group.

10. A power device, characterized in that: A battery comprising the battery of claim 9.

Images