Liquid injection hole cover, end cover, cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a liquid injection hole cover, an end cover, a cover plate assembly, a battery, a battery pack and electric equipment, the liquid injection hole cover is used for the cover plate assembly of the battery, the liquid injection hole cover comprises a cover body and a first matching part, the first matching part is convexly arranged on the surface of the cover body, and the first matching part is suitable for being connected with the end cover of the cover plate assembly. The liquid injection hole cover can be conveniently connected with an end cover.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a liquid injection hole cover, an end cover, a cover plate assembly, a battery, a battery pack and an electrical equipment. Background Art

[0002] Generally, a battery includes a battery cell, a battery housing, an end cover, and an electrolyte filled in the battery housing. The outer shell of a square lithium-ion battery is usually a steel shell or an aluminum shell, and the bare battery cell is encapsulated in the shell through the end cover. A liquid injection hole is provided on the end cover. After the battery is filled with liquid, the liquid injection hole cover and a seal are welded to the liquid injection hole on the cell cover to seal the end cover.

[0003] The existing liquid injection hole cover is inconvenient to install with the end cover. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a liquid injection hole cover, an end cover, a cover plate assembly, a battery, a battery pack and an electrical equipment, so as to solve the problem that the liquid injection hole cover is inconvenient to install with the end cover.

[0005] To achieve the purpose of the utility model, the following technical solutions are provided:

[0006] In the first aspect, the utility model provides a liquid injection hole cover for a cover plate assembly of a battery, which includes a cover body and a first matching part. The first matching part protrudes from the surface of the cover body, and the first matching part is adapted to be connected with the end cover of the cover plate assembly.

[0007] In one embodiment, the first matching part is in the shape of a ring connected end to end.

[0008] In one embodiment, the first matching part is in the shape of an annular ring rotationally symmetric about a first axis.

[0009] In one embodiment, the dimension of the first matching part in the extending direction of the first axis is H1, satisfying: 0.05 mm ≤ H1 ≤ 2.0 mm.

[0010] In one embodiment, the thickness of the first matching part in a first direction is D1, satisfying: 0.05 mm ≤ D1 ≤ 2.0 mm, and the first direction is the radial direction of the first matching part.

[0011] In one embodiment, the shape of the cross-section of the first matching part in its own circumferential direction is any one of an arc-shaped, semi-circular, trapezoidal, and triangular shape protruding from the surface facing away from the cover body, and the second direction is perpendicular to the circumferential direction of the first matching part.

[0012] In one embodiment, the first mating portion includes a first surface, a second surface, and a third surface. The first surface is connected to the cover body. One end of the second surface is connected to the inner peripheral edge of the first surface, and one end of the third surface is connected to the outer peripheral edge of the first surface. The other end of the second surface is connected to the other end of the third surface. In the cross-section of the first mating portion in its own circumferential direction, the shape of the second surface is a straight line or a curve, and the shape of the third surface is a straight line or a curve.

[0013] In one embodiment, the cover body is plate-shaped;

[0014] Alternatively, the cover body includes a first sub-cover and a second sub-cover connected to each other. The cover body is provided with a receiving groove that penetrates the first sub-cover. The outer side wall of the first sub-cover protrudes from the outer side wall of the second sub-cover. The first mating portion is disposed at one end of the first sub-cover away from the second sub-cover.

[0015] In a second aspect, the present utility model provides an end cap. The end cap is provided with a liquid injection hole and is adapted to be connected to the first mating portion of the liquid injection hole cover according to any one of the various embodiments of the first aspect. The liquid injection hole cover is adapted to close the liquid injection hole.

[0016] In one embodiment, the end cap is provided with a first receiving groove that surrounds the outer periphery of the liquid injection hole. The first receiving groove is adapted to receive a molten material.

[0017] In one embodiment, the end cap is further provided with a second receiving groove that surrounds the outer periphery of the liquid injection hole. The second receiving groove is communicated with the first receiving groove, and the first mating portion is connected to the inner wall of the second receiving groove.

[0018] In one embodiment, the end cap is further provided with a third receiving groove that surrounds the outer periphery of the second receiving groove. The third receiving groove is spaced apart from the second receiving groove and is adapted to receive a molten material.

[0019] In one embodiment, the end cap is provided with a fourth receiving groove that surrounds the outer periphery of the liquid injection hole. The opening of the fourth receiving groove faces the liquid injection hole cover, and the fourth receiving groove is adapted to receive an electrolyte.

[0020] In a third aspect, the present utility model provides a cover plate assembly for a battery, including the liquid injection hole cover according to any one of the various embodiments of the first aspect and the end cap according to any one of the various embodiments of the second aspect. The end cap is connected to the liquid injection hole cover.

[0021] In one embodiment, the liquid injection hole cover and the end cap are pressure fusion welded.

[0022] In a fourth aspect, the present utility model provides a battery, comprising a housing, an electric core, and a cover plate assembly according to any one of the embodiments of the third aspect. The electric core is received in the housing, and the cover plate assembly is connected to the housing.

[0023] In a fifth aspect, the present utility model provides a battery pack, comprising a battery according to any one of the embodiments of the fourth aspect.

[0024] In a sixth aspect, the present utility model provides an electrical device, comprising an electrical device and a battery according to any one of the embodiments of the fourth aspect or a battery pack according to any one of the embodiments of the fifth aspect. The battery or the battery pack supplies power to the electrical device.

[0025] The liquid injection hole cover of the present utility model is provided with a first mating part protruding from the surface of the cover body. During the connection process between the end cover and the liquid injection hole cover, the first mating part can play a positioning role. The setting of the first mating part is beneficial to the mating installation of the liquid injection hole cover and the end cover. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is an exploded view of a cover plate assembly of an embodiment;

[0028] Figure 2 is a cross-sectional view of a cover plate assembly of an embodiment;

[0029] Figure 3 is a cross-sectional view of a liquid injection hole cover of an embodiment;

[0030] Figure 4 is a cross-sectional view of an end cover of an embodiment.

[0031] Description of the Reference Numerals:

[0032] 100 - cover plate assembly, 10 - liquid injection hole cover, 11 - cover body, 12 - first mating part, 121 - second surface, 122 - third surface, 13 - first axis, 14 - first sub-cover, 15 - second sub-cover, 16 - receiving groove, 20 - end cover, 21 - liquid injection hole, 22 - fourth receiving groove, 23 - first receiving groove, 24 - second receiving groove, 25 - third receiving groove, 30 - seal. Detailed Embodiments

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the present utility model in the specification are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "and / or" used in the present utility model includes any and all combinations of one or more of the related listed items.

[0036] The following will describe in detail some embodiments of the present utility model in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] Reference may be made to Figure 1 and Figure 2 , the present utility model provides a liquid injection hole cover 10 for a cover plate assembly 100 of a battery. The liquid injection hole cover 10 includes a cover body 11 and a first fitting portion 12. The first fitting portion 12 is connected to the surface of the cover body 11, and the first fitting portion 12 is adapted to be connected to an end cover 20 of the cover plate assembly 100.

[0038] The material of the liquid injection hole cover 10 can be metal or the like. Specifically, the metal material can be aluminum alloy, stainless steel or the like.

[0039] The first fitting portion 12 and the cover body 11 can be an integral structure, that is, the first fitting portion 12 and the cover body 11 are an integral structure made by an integral molding process. The integral molding process can specifically be stamping, casting, etc., without limitation. The liquid injection hole cover 10 can also be a split structure, that is, the first fitting portion 12 and the cover body 11 can be connected and fixed by welding, bonding, snap connection, screw connection, etc.

[0040] The liquid injection hole cover 10 of the present utility model is provided with a first mating part 12 protruding from the surface of the cover body 11. During the connection process between the end cover 20 and the liquid injection hole cover 10, the first mating part 12 can play a positioning role, and the setting of the first mating part 12 is beneficial to the mating installation of the liquid injection hole cover 10 and the end cover 20.

[0041] In one embodiment, the first mating part 12 is in the form of an annular ring connected end to end, so that a linear contact zone is formed between the first mating part 12 and the end cover 20 during the connection process. The linear contact zone can provide a uniform force distribution at the connection between the first mating part 12 and the end cover 20. Compared with point contact, line contact also increases the contact area during the connection process, avoids stress concentration during the connection process, and can use a smaller force to ensure the connection strength at the connection between the first mating part 12 and the end cover 20 during the connection process.

[0042] For reference Figure 3 , in one embodiment, the first mating part 12 is in the form of a circular ring that is rotationally symmetric about the first axis 13.

[0043] The first mating part 12 is rotationally symmetric about the first axis 13. Specifically, the cross-sectional shape of the first mating part 12 can be circular.

[0044] The rotational symmetry of the first mating part 12 about the first axis 13 makes the contact strength between any part of the first mating part 12 and the end cover 20 the same, which is beneficial to the structural stability of the cover plate assembly 100 and also facilitates the production of the first mating part 12 and the end cover 20.

[0045] For reference Figure 3 , in one embodiment, the shape of the cross-section of the first mating part 12 in its own circumferential direction is any one of an arcuate shape, a semi-circular shape, a trapezoidal shape, and a triangular shape that protrudes from the surface facing away from the cover body 11.

[0046] Optionally, the area of the surface of the first mating part 12 away from the cover body 11 is smaller than the area of the surface of the first mating part 12 close to the cover body 11, which is convenient for connecting the first mating part 12 and the cover body 11.

[0047] The shape of the cross-section of the first mating part 12 in its own circumferential direction is diverse, which is convenient for adjusting the shape of the first mating part 12, increasing the contact area with the cover body 11, and improving the connection strength between the first mating part 12 and the cover body 11.

[0048] For reference Figure 3, In one embodiment, the first engaging portion 12 includes a first surface, a second surface 121, and a third surface 122. The first surface is connected to the cover body 11. One end of the second surface 121 is connected to the inner peripheral edge of the first surface, and one end of the third surface 122 is connected to the outer peripheral edge of the first surface. The other end of the second surface 121 is connected to the other end of the third surface 122. In the cross-section of the first engaging portion 12 in its own circumferential direction, the shape of the second surface 121 is a straight line or a curve, and the shape of the third surface 122 is a straight line or a curve.

[0049] Optionally, in the cross-section of the first engaging portion 12 in its own circumferential direction, both the second surface 121 and the third surface 122 are straight lines. Correspondingly, the cross-sectional shape of the first engaging portion 12 is a triangle; the second surface 121 is a concave curve outward, and the third surface 122 is a concave curve inward. Correspondingly, the cross-sectional shape of the first engaging portion 12 is an arc; the second surface 121 is a straight line and the third surface 122 is a curve; the second surface 121 is a curve and the third surface 122 is a straight line; both the second surface 121 and the third surface 122 are curves, but the curves are both concave outward or both concave inward.

[0050] By providing the first surface, the second surface 121, and the third surface 122, the first engaging portion 12 realizes line contact with the end cover 20, and by changing the shapes of the first surface and the second surface 121 in the cross-section of the first engaging portion 12 in its own circumferential direction, the shape of the first engaging portion 12 is changed.

[0051] In one embodiment, the dimension of the first engaging portion 12 in the extending direction of the first axis 13 is H1, satisfying: 0.05 mm ≤ H1 ≤ 2.0 mm.

[0052] H1 can be 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2.0 mm, etc., without limitation.

[0053] When H1 < 0.05 mm, the height of the first engaging portion 12 is too small. During welding, there is little metal available for the first engaging portion 12 to connect, and the welding strength with the end cover 20 is low; when H1 > 2.0 mm, the height of the first engaging portion 12 is too high, and the connection strength between the first engaging portion 12 and the end cover 20 after welding is small; when 0.05 mm ≤ H1 ≤ 2.0 mm, the first engaging portion 12 can simultaneously meet the metal required for welding and the connection strength between the first engaging portion 12 and the end cover 20 after welding.

[0054] For reference Figure 3 , In one embodiment, the thickness of the first engaging portion 12 in the first direction is D1, satisfying: 0.05 mm ≤ D1 ≤ 2.0 mm, and the first direction is the radial direction of the first engaging portion 12.

[0055] D1 can be 0.05mm, 0.1mm, 0.5mm, 1mm, 1.5mm, 2.0mm, etc., without limitation.

[0056] Taking welding connection as an example, when D1 < 0.05mm, the thickness of the first fitting part 12 in the first direction is too small. During welding, there is little metal available for the first fitting part 12 to connect, resulting in low welding strength with the end cover 20. When D1 > 2.0mm, the size of the first fitting part 12 in the radial direction is too large, and there is too much remaining part of the first fitting part 12 after welding. The excess part will affect the welding strength. When 0.05mm ≤ D1 ≤ 2.0mm, the welding strength between the first fitting part 12 and the end cover 20 is good.

[0057] For reference Figure 3 In one embodiment, the cover body 11 is plate-shaped. Alternatively, the cover body 11 includes a first sub-cover 14 and a second sub-cover 15 connected to each other. The cover body 11 is provided with a receiving groove 16 that penetrates through the first sub-cover 14 and the second sub-cover 15. The outer side wall of the first sub-cover 14 protrudes from the outer side wall of the second sub-cover 15, and the first fitting part 12 is provided at one end of the first sub-cover 14 away from the second sub-cover 15.

[0058] When the cover body 11 is plate-shaped, the end of the cover body 11 away from the battery cell is flush with the surface of the end cover 20. After the cover body 11 and the end cover 20 are welded, the end face of the cover plate assembly 100 away from the cell is jointly formed by the cover body 11 and the end cover 20 and is a plane. The cover body 11 is a flat nail structure.

[0059] The bottom wall of the receiving groove 16 can be rectangular, circular, oval, etc., without limitation. The receiving groove 16 is suitable for receiving the seal 30 of the battery.

[0060] The shape of the cover body 11 can be set according to the specific requirements of the battery.

[0061] For reference Figure 1 、 Figure 2 and Figure 4 The present utility model provides an end cover 20. The end cover 20 is provided with a liquid injection hole 21. The end cover 20 is suitable for connecting with the first fitting part 12 of the liquid injection hole cover 10 in any one of the foregoing embodiments, and the liquid injection hole cover 10 is suitable for closing the liquid injection hole 21.

[0062] The material of the end cover 20 can be metal, etc. The specific metal material can be aluminum alloy, steel, etc.

[0063] The shape of the liquid injection hole 21 can be oval, rectangular, circular, etc., without limitation.

[0064] The cross-section of the end cover 20 can be rectangular, oval, circular, etc., corresponding to the outer shell of the battery. Optionally, both the end cover 20 and the first fitting part 12 are rotationally symmetric about the first axis 13.

[0065] The end cap 20 and the liquid injection hole cap 10 are connected in cooperation through the first engaging portion 12. During the connection process of the end cap 20 and the liquid injection hole cap 10, the first engaging portion 12 can play a positioning role, which is beneficial to the cooperative installation of the liquid injection hole cap 10 and the end cap 20.

[0066] For reference Figure 4 In one embodiment, the end cap 20 is provided with a fourth receiving groove 22, the fourth receiving groove 22 surrounds the outer periphery of the liquid injection hole 21, the opening of the fourth receiving groove 22 faces the liquid injection hole cap 10, and the fourth receiving groove 22 is adapted to receive the electrolyte.

[0067] The bottom wall of the fourth receiving groove 22 can be circular, rectangular, etc., without limitation. The forming method of the fourth receiving groove 22 can be stamping. Setting the fourth receiving groove 22 as an electrolyte overflow storage groove can effectively prevent the electrolyte from contaminating the welding surface of the liquid injection hole cap 10 and the end cap 20, and can improve the product yield.

[0068] For reference Figure 4 In one embodiment, the end cap 20 is provided with a first receiving groove 23, the first receiving groove 23 surrounds the outer periphery of the liquid injection hole 21, and the first receiving groove 23 is adapted to receive the molten material.

[0069] The bottom wall of the first receiving groove 23 can be circular, rectangular, etc., without limitation. The forming method of the first receiving groove 23 can be stamping.

[0070] Optionally, the first receiving groove 23 surrounds the outer periphery of the fourth receiving groove 22.

[0071] The first receiving groove 23 can be one or two. When the first receiving groove 23 is two, they are respectively set as the first sub-groove and the second sub-groove, the first sub-groove and the second sub-groove are arranged at intervals, and the area where the first engaging portion 12 is in line contact with the end cap 20 is located between the first sub-groove and the second sub-groove.

[0072] The first receiving groove 23 serves as a waste storage groove for the first engaging portion 12. The first receiving groove 23 is adapted to receive the excess molten material during the welding process of the liquid injection hole cap 10. After the excess material of the first engaging portion 12 melts, it can enter the first receiving groove 23 to ensure the formation of a beautiful weld seam.

[0073] For reference Figure 4 In one embodiment, the end cap 20 is provided with a second receiving groove 24, the second receiving groove 24 surrounds the outer periphery of the liquid injection hole 21, the second receiving groove 24 communicates with the first receiving groove 23, and the first engaging portion 12 is connected to the inner wall of the second receiving groove 24.

[0074] Optionally, the second receiving groove 24 surrounds the outer periphery of the fourth receiving groove 22.

[0075] The second receiving groove 24 can be correspondingly arranged with the first mating portion 12. The cross-sectional shape of the first mating portion 12 is triangular, and the cross-sectional shape of the second receiving groove 24 is correspondingly triangular; the cross-sectional shape of the first mating portion 12 is arc-shaped, and the cross-sectional shape of the second receiving groove 24 is correspondingly arc-shaped.

[0076] The second receiving groove 24 may not be correspondingly arranged with the first mating portion 12. For example, when the cross-sectional shape of the first mating portion 12 is triangular, the cross-sectional shape of the second receiving groove 24 is rectangular, so that the bottom wall of the second receiving groove 24 is in line contact with the first mating portion 12.

[0077] Taking welding connection as an example, when the first receiving groove 23 is the first sub-groove and the second sub-groove, optionally, the two side walls of the second receiving groove 24 are respectively communicated with the first sub-groove and the second sub-groove. The molten material during the welding process of the first mating portion 12 and the end cover 20 is extruded out of the second receiving groove 24, ensuring a beautiful weld formation.

[0078] Optionally, when the second receiving groove 24 is correspondingly arranged with the first mating portion 12, the dimension of the second receiving groove 24 in the axial direction is H1, and the thickness of the second receiving groove 24 in the radial direction is D1; the dimension of the first receiving groove 23 in the axial direction is H2, satisfying: H2 ≤ H1, and the thickness of the first receiving groove 23 in the radial direction is D2, satisfying: D2 ≤ D1. Since the first receiving groove 23 is suitable for receiving the molten material during the welding process, and the molten material generated during the welding process is less than the volume of the first mating portion 12, the dimension of the first receiving groove 23 being smaller than that of the first mating portion 12 can still ensure that the molten material does not stay on the surface of the end cover 20.

[0079] During the welding process, the molten material during the welding of the first mating portion 12 and the end cover 20 is extruded from the second receiving groove 24 into the first receiving groove 23 communicated with the second receiving groove 24. The molten material will not flow through the surface of the end cover 20, ensuring a beautiful weld formation and also being beneficial to improving the yield rate of the product.

[0080] For reference Figure 4 In an embodiment, the end cover 20 is further provided with a third receiving groove 25. The third receiving groove 25 surrounds the outer periphery of the second receiving groove 24. The third receiving groove 25 is spaced from the second receiving groove 24, and the third receiving groove 25 is suitable for receiving the molten material.

[0081] The bottom wall of the third receiving groove 25 can be rectangular, circular, etc., without limitation. The third receiving groove 25 and the first receiving groove 23 are both used to receive the molten material generated during welding, playing a dual-insurance role to prevent the molten material received by the first receiving groove 23 from being too much and solidifying on the surface of the end cover 20, ensuring a beautiful weld formation.

[0082] For reference Figure 1, the present utility model provides a cover plate assembly 100 for a battery. The cover plate assembly 100 includes an end cap 20 of any one of the foregoing embodiments and a liquid injection hole cover 10 of any one of the foregoing embodiments, and the end cap 20 is connected to the liquid injection hole cover 10.

[0083] For reference Figure 1 , in one embodiment, the cover plate assembly 100 further includes a seal 30. The seal 30 is adapted to close the liquid injection hole 21 on the end cap 20 of the cover plate assembly 100, and the shape of the seal 30 is correspondingly arranged with the liquid injection hole 21. The material of the seal 30 can be rubber, silica gel, polytetrafluoroethylene (PTEE), metal material, etc. The metal material can specifically be stainless steel, aluminum, etc., without limitation.

[0084] , in one embodiment, the liquid injection hole cover 10 and the end cap 20 are fusion welded by pressure. The fusion welding by pressure presses the upper and lower electrodes against the first mating portion 12, and an electric current flows through the first mating portion 12, generating resistance heat in the material contact surface and the nearby area, so that the welded metal is locally melted to achieve atomic bonding and form a firm welded joint.

[0085] The cover plate assembly 100 of the battery of the present utility model is fusion welded by pressure through the setting of the first mating portion 12 and the end cap 20. The fusion welding by pressure uses the resistance heat generated by the electric current passing through the end cap 20 and the first mating portion 12 as the heat source, locally heats the end cap 20 and the first mating portion 12 and applies pressure simultaneously for welding. The fusion welding by pressure does not require molten materials, so it has high productivity, small deformation of the welded parts, and is easy to realize automation. Compared with traditional laser welding, the main advantages of the fusion welding by pressure include lower equipment cost, shorter welding cycle, stronger welding ability, higher welding efficiency, lower sensitivity to foreign matters such as electrolyte, improved welding airtightness and welding quality between the liquid injection hole cover 10 and the end cap 20, and improved yield rate of the cover plate assembly 100.

[0086] The present utility model provides a battery, which includes a housing, an electric core, and the cover plate assembly 100 of any one of the foregoing embodiments. The electric core is housed in the housing, and the cover plate assembly 100 is connected to the housing.

[0087] The housing can be an integral structure made by an integral molding process. The integral molding process can specifically be stamping, casting, etc., without limitation. The housing can also be a split structure, that is, the housing can be formed by connecting and fixing multiple side plates by welding, bonding, clamping, screwing, etc. The wall thickness at each part of the housing can be substantially uniform.

[0088] The battery cell of the present utility model can be a square battery, a round battery, a soft-pack battery cell, etc. Optionally, the battery cell is a blade battery cell in the square battery cells. The blade battery cell has high packaging reliability, high volume utilization rate, and good heat dissipation performance, effectively increasing the space utilization rate of the battery and improving the energy density of the battery. The battery cell further includes a negative terminal and an electrolyte fixing plate. The negative terminal is directly connected to the negative electrode of the battery cell to ensure that the current of the negative electrode of the battery cell can be stably and safely output to the required device or system. The negative terminal is usually made of a metal material with good conductivity, such as copper, nickel or alloy, etc. The negative terminal also cooperates with the seal 30 or other sealing structures to ensure the sealing performance of the battery and prevent the leakage of the electrolyte. The connection method between the negative terminal and the negative electrode sheet can be welding, crimping, etc., without limitation. The electrolyte fixing plate is used to ensure good tightness between the positive electrode sheet, the negative electrode sheet and the separator of the battery, so that the electrolyte can fully infiltrate the positive electrode sheet and the negative electrode sheet of the battery, improving the performance and safety of the battery.

[0089] In one embodiment, the seal 30 is also used for sealing and fixing the negative terminal of the battery cell of the battery. The seal 30 forms a sealing effect through cooperation with the negative terminal to prevent the leakage of the electrolyte. At the same time, the seal 30 can also fix components such as the negative terminal and the electrolyte fixing plate, thereby stabilizing the structure of the battery.

[0090] Specifically, the assembly method of the battery in one embodiment of the present utility model is as follows: the battery cell is received in the outer shell; the end cover 20 of the cover assembly 100 is connected and fixed to the outer shell; the electrolyte is injected into the outer shell through the liquid injection hole 21 of the end cover 20; after the injection is completed, the liquid injection hole 21 is sealed with the seal 30; the first mating portion 12 of the liquid injection hole cover 10 is welded to the end cover 20; post-welding inspection, such as helium leak detection and other steps are carried out.

[0091] The present utility model provides a battery pack, including the battery described in any one of the foregoing embodiments. The battery pack may include multiple batteries, and the multiple batteries are connected in series or in parallel. The battery pack further includes multiple components such as a battery management system (BMS), a radiator, a connector, a housing, etc.

[0092] The present utility model provides an electrical equipment, including an electrical device and the battery or battery pack described in any one of the foregoing embodiments. The battery or battery pack supplies power to the electrical device. The electrical equipment can be a washing machine, a television, etc., and the electrical device can be a transformer, a light bulb, etc., without limitation.

[0093] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0094] The above-disclosed is only a preferred embodiment of the present utility model. Of course, it cannot be used to limit the scope of rights of the present utility model. Those of ordinary skill in the art can understand the entire or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the present utility model.

Claims

1. A liquid filling hole cover, used for a cover plate assembly of a battery, characterized in that: It comprises a cover body and a first matching portion, wherein the first matching portion is protruding from the surface of the cover body and is suitable for connecting with the end cover of the cover plate assembly.

2. The liquid filling hole cover according to claim 1, characterized in that: The first matching portion is in a ring shape connected end to end.

3. The liquid filling hole cover according to claim 2, characterized in that: The first matching portion is in the shape of a circular ring that is rotationally symmetrical about a first axis.

4. The liquid filling hole cover according to claim 3, characterized in that: A dimension of the first matching portion in the extending direction of the first axis is H1, which satisfies: 0.05 mm ≤ H1 ≤ 2.0 mm.

5. The liquid injection hole cover according to claim 3, characterized in that: The thickness of the first matching portion in the first direction is D1, which satisfies: 0.05 mm≤D1≤2.0 mm. The first direction is the radial direction of the first matching portion.

6. The liquid filling hole cover according to claim 2, characterized in that: The cross-section of the first matching portion in its circumferential direction is in any one of an arcuate shape, a semicircular shape, a trapezoidal shape, and a triangular shape that is convex on the surface facing away from the cover body.

7. The liquid filling hole cover according to claim 2, characterized in that: The first matching portion includes a first surface, a second surface and a third surface, the first surface is connected to the cover body, one end of the second surface is connected to the inner peripheral edge of the first surface, one end of the third surface is connected to the outer peripheral edge of the first surface, and the other end of the second surface is connected to the other end of the third surface. In the cross-section of the first matching portion in its own circumferential direction, the shape of the second surface is a straight line or a curve, and the shape of the third surface is a straight line or a curve.

8. The liquid filling hole cover according to any one of claims 1 to 7, characterized in that: The cover body is plate-shaped; Alternatively, the cover body includes a first sub-cover and a second sub-cover connected to each other, the cover body is provided with a receiving groove, the receiving groove passes through the first sub-cover, the outer wall of the first sub-cover protrudes from the outer wall of the second sub-cover, and the first matching portion is arranged at an end of the first sub-cover away from the second sub-cover.

9. An end cap, used for a cover plate assembly of a battery, characterized in that: The end cover is provided with a liquid injection hole, and the end cover is suitable for being connected to the first matching portion of the liquid injection hole cover according to any one of claims 1 to 8, and the liquid injection hole cover is suitable for closing the liquid injection hole.

10. The end cap according to claim 9, characterized in that: The end cover is provided with a first receiving groove, which surrounds the outer circumference of the injection hole and is suitable for receiving molten material.

11. The end cap according to claim 10, characterized in that: The end cover is further provided with a second receiving groove, the second receiving groove surrounds the outer circumference of the injection hole, the second receiving groove is communicated with the first receiving groove, and the first matching portion is connected to the inner wall of the second receiving groove.

12. The end cap according to claim 11, characterized in that: The end cover is further provided with a third receiving groove, the third receiving groove surrounds the outer circumference of the second receiving groove, the third receiving groove is spaced apart from the second receiving groove, and the third receiving groove is suitable for receiving molten material.

13. The end cap according to claim 9, characterized in that: The end cover is further provided with a fourth receiving groove, the fourth receiving groove surrounds the outer circumference of the injection hole, the opening of the fourth receiving groove faces the injection hole cover, and the fourth receiving groove is suitable for accommodating electrolyte.

14. A cover plate assembly for a battery, characterized in that: It comprises the injection hole cover according to any one of claims 1 to 8 and the end cover according to any one of claims 9 to 13, wherein the injection hole cover is connected to the end cover.

15. The cover plate assembly according to claim 14, characterized in that: The injection hole cover is pressure-fused to the end cover.

16. A battery, characterized in that: It comprises a shell, a battery cell and a cover plate assembly as claimed in claim 14 or 15, wherein the battery cell is accommodated in the shell, and the cover plate assembly is connected to the shell.

17. A battery pack, characterized in that: Comprising the battery of claim 16.

18. An electrical equipment, characterized in that: The invention comprises an electric device and a battery as claimed in claim 16 or a battery pack as claimed in claim 17, wherein the battery or the battery pack supplies power to the electric device.

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