Battery cover plate structural member and battery

Abstract

The utility model discloses a battery cover plate structural member and a battery, the battery cover plate structural member comprises a pole, the pole is provided with an end part and a bottom part, the bottom part is a conductive structure, and a sealing structure is arranged at the joint of the end part and the bottom part; the sealing ring has a shape matched with that of the sealing structure and is sleeved on the sealing structure; the base plate is provided with a pole hole for the end part of the pole to penetrate out, the end part penetrates out of the pole hole, one side, close to the bottom, of the base plate is provided with a groove for the sealing ring to be embedded, and the base plate is also provided with an explosion-proof structure; and the plastic sealing piece is arranged between the end part and the pole hole and is used for sealing a space between the end part and the substrate. According to the battery cover plate structural member disclosed by the invention, the positions of the pole and the substrate are not easy to deviate relatively, and the battery cover plate structural member can bear the expansion and temperature difference change of the battery cell in the charging and discharging process, so that the lasting sealing performance can be ensured; and an explosion-proof structure is arranged, so that the use safety is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover plate structure and a battery. Background Art

[0002] At present, it is very necessary to develop energy storage power stations that can store green energy. As the core subunit of energy storage power stations, large aluminum shell energy storage batteries must meet the requirements of long-term operation under harsh conditions for more than ten or even twenty years. As a conductive and sealed structure, the battery cover must have a certain strength and rigidity to withstand the expansion changes of the battery cell during the charging and discharging process and the temperature changes caused by heat; at the same time, it needs to maintain a high sealing performance and meet the safety explosion relief function during long-term charging and discharging. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the present application provides a battery cover structure with high sealing performance and explosion-proof performance.

[0004] The present application provides a battery cover structure, comprising:

[0005] The pole has an end and a bottom, the bottom is a conductive structure, and a sealing structure is provided at the junction of the end and the bottom;

[0006] A sealing ring, having a shape adapted to the sealing structure, and sleeved on the sealing structure;

[0007] A base plate is provided with a pole hole for the end of the pole to pass through, the end passes through the pole hole, the base plate is provided with a groove for the sealing ring to be embedded on one side close to the bottom, and the base plate is also provided with an explosion-proof structure;

[0008] A plastic seal is disposed between the end portion and the pole hole and is used to seal the space between the end portion and the substrate.

[0009] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0010] Optionally, the sealing structure is a conical boss whose width gradually decreases from the end to the bottom, and the cone angle of the conical boss is 85 to 88°; the sealing ring wraps the conical boss, and the sealing ring has a conical structure consistent with the sealing structure; the groove has a structure with a gradually decreasing width that cooperates with the sealing ring.

[0011] Optionally, a spacer is also provided, which is arranged below the substrate and has a mounting hole for the sealing structure to pass through; the side of the conductive structure close to the end has an end structure whose width gradually increases from the end to the bottom, and the end structure is inserted into the mounting hole.

[0012] Optionally, a side of the pole hole close to the end has a boss structure extending outward, and the plastic seal covers the entire boss structure.

[0013] Optionally, the boss structure has an outward folded structure bent toward the outer periphery of the pole hole.

[0014] Optionally, a protruding structure is provided on the periphery of a portion of the end of the pole that passes through the pole hole, and the plastic seal covers the protruding structure.

[0015] The explosion-proof structure comprises:

[0016] An explosion-proof hole is provided on the substrate;

[0017] The reinforcement structure is a boss with an L-shaped cross section, having a top side and a bottom side; the bottom side is welded to one side of the base plate close to the end, and is enclosed at the edge of the explosion-proof hole;

[0018] An explosion-proof membrane covers the explosion-proof hole and is welded to the bottom side of the reinforcement structure.

[0019] Optionally, the surface of the explosion-proof membrane is provided with a convex rib structure, and the shape of the convex rib structure is two symmetrically arranged three-section arcs connected end to end, wherein the middle sections of two arcs overlap each other; or the shape of the convex rib structure is two symmetrically arranged two-section arcs connected end to end.

[0020] Optionally, a protective film is provided on the top side of the reinforcement structure.

[0021] The present application also provides a battery having the battery cover structure as described above.

[0022] The battery cover plate structure provided by the present application has a sealing structure on the pole, a sealing ring is sleeved on the sealing structure, the end of the pole passes through the pole hole opened in the substrate, the sealing ring is embedded in the groove, and the plastic seal seals the space between the end and the substrate; such an arrangement of the position of the pole and the substrate is not prone to relative displacement, and can withstand the expansion and temperature difference changes of the battery cell during the charging and discharging process, so that the battery cover plate structure has long-lasting sealing; and an explosion-proof structure is arranged on the cover plate to take safety into account while ensuring sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded schematic diagram of a battery cover structure in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of the cross-sectional structure of a substrate in an embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the battery cover structure in the embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of the explosion-proof structure in the embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the convex rib structure in one embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the rib structure in another embodiment of the present application.

[0029] The reference numerals in the figures are described as follows:

[0030] 10. Pole; 11. End; 12. Bottom; 13. Sealing structure; 14. Cone angle of conical boss; 15. End structure; 16. Boss structure; 17. Protruding structure; 20. Sealing ring; 21. Groove; 30. Base plate; 31. Pole hole; 40. Plastic seal; 41. Spacer; 42. Mounting hole; 50. Explosion-proof structure; 51. Explosion-proof hole; 52. Reinforcement structure; 53. Explosion-proof membrane; 54. Rib structure; 55. Protective membrane; 56. Micro-concave notch. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] like Figure 1-2 As shown, a battery cover structure provided by an embodiment of the present application includes a pole 10, a sealing ring 20, a substrate 30 and a plastic seal 40. The pole 10 has an end 11 and a bottom 12, and the bottom 12 is a conductive structure. A sealing structure 13 is provided at the junction of the end 11 and the bottom 12 of the pole 10. The sealing ring 20 has a shape adapted to the sealing structure 13 and is sleeved on the sealing structure 13. The substrate 30 is provided with a pole hole 31 for the end 11 of the pole 10 to pass through, and the end 11 passes through the pole hole 31. The substrate 30 is provided with a groove 21 for the sealing ring 20 to be embedded on one side close to the bottom 12, and the substrate 30 is also provided with an explosion-proof structure 50. The plastic seal 40 is provided between the end 11 and the pole hole 31, and is used to seal the space between the end 11 and the substrate 30.

[0035] The pole 10 is provided with a sealing structure 13 , the sealing ring 20 is sleeved on the sealing structure 13 and then embedded in the groove 21 , and the plastic seal 40 is sealed between the end 11 and the base plate 30 , together forming a battery cover structure with good sealing performance.

[0036] In one embodiment, the sealing structure 13 is a conical boss whose width gradually decreases from the end to the bottom, and the cone angle 14 of the conical boss is any value between 85 and 88 degrees. The pole 10 is circular, the sealing structure 13 is an inverted cone structure that is wide at the top and narrow at the bottom, and the sealing ring 20 wraps the conical boss. The sealing ring 20 has a conical structure consistent with the sealing structure 13, and the shape of the sealing ring 20 is also similar to the inverted cone structure of the sealing structure 13. The groove 21 opened on one side of the substrate 30 has a structure with a gradually decreasing width that matches the sealing ring 20, so that the sealing ring 20 is easy to be embedded in the groove 21. The sealing structure 13, the sealing ring 20 and the groove 21 are set to be cones with inconsistent widths at the top and bottom, which are not easy to produce relative displacement when heated and expanded, which is beneficial to improving the sealing performance of the battery.

[0037] In one embodiment, if Figure 3 As shown, the battery cover plate structure is also provided with a spacer 41, which is arranged below the substrate 30 and has a mounting hole 42 for the sealing structure 13 to pass through. The side of the conductive structure close to the end 11 has a terminal structure 15 whose width gradually increases from the end to the bottom, and the terminal structure 15 is inserted into the mounting hole 42. The terminal structure 15 is also in the shape of a cone with a narrow top and a wide bottom, and the cone angle of the terminal structure 15 is any value between 85 and 88 degrees. The spacer 41 is made of plastic material, and the spacer 41 is provided to fix the bottom 12 of the pole 10. At the same time, the terminal structure 15 is engaged in the mounting hole 42 opened by the spacer 41. The pole 10 as a whole is not easy to be displaced during use, so that the sealing performance is maintained for a longer time. The sealing structure 13 and the terminal structure 15 are a pair of inverted cones, and the pole 10 is fixed by the spacer 41 to reduce the axial displacement caused by thermal expansion.

[0038] In one embodiment, if Figure 2-3 As shown, the side of the pole hole 31 close to the end 11 has a boss structure 16 extending outward, and the plastic seal 40 covers the boss structure 16 as a whole. The plastic seal 40 is injection-molded and bonded between the end 11 and the substrate 30. The boss structure 16 is provided to increase the force between the plastic seal 40 and the substrate 30 to prevent the plastic seal 40 and the substrate 30 from being separated when the plastic seal 40 expands due to heat. The boss structure 16 has an outward folding structure that bends toward the outer periphery of the pole hole 31, and the cross-section of the boss structure 16 is inverted L-shaped. The folding structure of the boss structure 16 further increases the bonding force between the plastic seal 40 and the substrate 30, and maintains the sealing of the battery cover structure.

[0039] In one embodiment, a protruding structure 17 is provided on the periphery of the portion of the end 11 of the pole 10 that passes through the pole hole 31, and the plastic seal 40 covers the protruding structure 17. The protruding structure 17 is provided to increase the force between the plastic seal 40 and the end 11, thereby preventing the plastic seal 40 from being separated from the end 11 when the plastic seal 40 expands due to heat.

[0040] In one embodiment, if Figure 4 As shown, the explosion-proof structure 50 includes an explosion-proof hole 51, a reinforcement structure 52 and an explosion-proof membrane 53. The explosion-proof hole 51 is opened in the substrate 30 and penetrates the substrate 30. The reinforcement structure 52 is a boss with an L cross-section, having a top side and a bottom side. The bottom side of the reinforcement structure 52 is welded to the side of the substrate 30 close to the end 11, and is surrounded at the edge of the explosion-proof hole 51. The reinforcement structure 52 can be welded to the substrate 30 by laser welding, and a micro-concave notch 56 is provided on the reinforcement structure 52. The explosion-proof membrane 53 covers the explosion-proof hole 51 and is welded to the bottom side of the reinforcement structure 52. The reinforcement structure 52 is provided to increase the anti-breathing effect of the explosion-proof membrane 53, and at the same time increase the cavity space of the explosion-proof hole 51. Under thermal runaway conditions, the probability and quantity of the external cooling fire extinguishing agent entering the battery cell from the explosion-proof hole 51 can be increased, thereby improving the safety of the battery cover plate structure disclosed in the embodiment of the present application during use.

[0041] In some embodiments, Figure 5 As shown, the surface of the explosion-proof membrane 53 is provided with a convex rib structure 54, which is formed by a stamping process. The strong structure 52 and the convex rib structure 54 together increase the anti-breathing effect of the explosion-proof membrane 53. The convex rib structure 54 is in the shape of two symmetrically arranged three-section arcs connected end to end, wherein the middle sections of the two arcs overlap each other. Or, as Figure 6 As shown, the rib structure 54 is in the shape of two symmetrically arranged arcs connected end to end.

[0042] In one embodiment, if Figure 3As shown, a protective film 55 is provided on the top side of the reinforcement structure 52 to protect the explosion-proof film 53. The protective film can be made of PET, and the protective film 55 is attached to the top side of the reinforcement structure 52.

[0043] Another embodiment of the present application further provides a battery having a battery cover structure as described above, and other components adopt existing designs and will not be described in detail in this application.

[0044] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0045] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery cover structure, characterized in that: include: The pole has an end and a bottom, the bottom is a conductive structure, and a sealing structure is provided at the junction of the end and the bottom; A sealing ring, having a shape adapted to the sealing structure, and sleeved on the sealing structure; A base plate is provided with a pole hole for the end of the pole to pass through, the end passes through the pole hole, the base plate is provided with a groove for the sealing ring to be embedded on one side close to the bottom, and the base plate is also provided with an explosion-proof structure; A plastic seal is disposed between the end portion and the pole hole and is used to seal the space between the end portion and the substrate.

2. The battery cover structure according to claim 1, characterized in that: The sealing structure is a conical boss whose width gradually decreases from the end to the bottom, and the angle of the conical boss is 85 to 88 degrees; the sealing ring wraps the conical boss, and the sealing ring has a conical structure consistent with the sealing structure; the groove has a structure with a gradually decreasing width that matches the sealing ring.

3. The battery cover structure according to claim 1, characterized in that: A spacer is also provided, which is arranged below the substrate and has a mounting hole for the sealing structure to pass through; the conductive structure has a terminal structure on one side close to the end, the width of which gradually increases from the end to the bottom, and the terminal structure is inserted into the mounting hole.

4. The battery cover structure according to claim 1, characterized in that: A side of the pole hole close to the end portion is provided with a boss structure extending outward, and the plastic seal entirely covers the boss structure.

5. The battery cover structure according to claim 4, characterized in that: The boss structure has an outward folding structure bent toward the outer periphery of the pole hole.

6. The battery cover structure according to claim 1, characterized in that: A protruding structure is arranged on the periphery of a portion of the end of the pole that passes through the pole hole, and the plastic seal covers the protruding structure.

7. The battery cover structure according to claim 1, characterized in that: The explosion-proof structure comprises: An explosion-proof hole is provided on the substrate; The reinforcement structure is a boss with an L-shaped cross section, having a top side and a bottom side; the bottom side is welded to one side of the base plate close to the end, and is enclosed at the edge of the explosion-proof hole; An explosion-proof membrane covers the explosion-proof hole and is welded to the bottom side of the reinforcement structure.

8. The battery cover structure according to claim 7, characterized in that: The surface of the explosion-proof membrane is provided with a convex rib structure, the shape of the convex rib structure is two symmetrically arranged three-section arcs connected end to end, wherein the middle sections of the two arcs overlap each other; or the shape of the convex rib structure is two symmetrically arranged two-section arcs connected end to end.

9. The battery cover structure according to claim 7, characterized in that: A protective film is provided on the top side of the reinforcement structure.

10. A battery, characterized in that: A battery cover plate structure as claimed in any one of claims 1 to 9.

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