Battery cover plate, battery, battery pack and electric equipment

Abstract

The utility model provides a battery cover plate, a battery pack and electric equipment. The battery cover plate is used for being mounted on a battery shell of a battery and comprises an insulating ring and a cover plate, wherein the insulating ring is used for being connected with a battery shell; the cover plate is arranged on the insulating ring, a buffer groove is formed in the cover plate, the buffer groove is located in the surface of at least one side, close to the battery shell or away from the battery shell, of the cover plate, and the buffer groove is used for accommodating deformation generated when the insulating ring extrudes the cover plate towards one side of the cover plate. The utility model aims to solve the problems that the yield of a battery is low and the service life of the battery is shortened due to the fact that the insulating ring is easy to be subjected to brittle fracture under the condition of high and low temperature impact.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of batteries, and in particular, to a battery cover plate, a battery, a battery pack, and an electrical device. Background Art

[0002] A battery is a power source that provides power for tools, and mostly refers to a storage battery or a rechargeable battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0003] Currently, a battery generally consists of structural components such as a cover plate and an aluminum shell; an insulating ring is arranged between the cover plate and the aluminum shell, and the insulating ring is used to isolate the electrical connection between the cover plate and the aluminum shell and can provide safety protection for the inside of the aluminum shell.

[0004] In related technologies, under high and low temperature impacts, the insulating ring is prone to brittle fracture, resulting in a low yield rate of the battery and a short service life of the battery. Summary of the Utility Model

[0005] Embodiments of the present application provide a battery cover plate, a battery, a battery pack, and an electrical device, which can solve the problem that the insulating ring is prone to brittle fracture under high and low temperature impacts, resulting in a low yield rate of the battery and a short service life of the battery.

[0006] Embodiments of the present application provide the following technical solutions:

[0007] In a first aspect of embodiments of the present application, a battery cover plate is provided for being installed on a battery housing of a battery. The battery cover plate includes:

[0008] An insulating ring for connecting with the battery housing;

[0009] A cover plate arranged on the insulating ring;

[0010] Wherein, a buffer groove is formed on the cover plate, and the buffer groove is located on at least one side surface of the cover plate close to or away from the battery housing.

[0011] For the battery cover plate with this structure, the insulating ring is used for insulating connection between the battery housing and the cover plate, the cover plate is used for forming the positive or negative electrode of the battery, and the buffer groove on the cover plate can accommodate the deformation generated when the insulating ring presses the cover plate on one side facing the cover plate under high and low temperature impacts and release the stress on the insulating ring, so as to reduce the occurrence of cracking of the insulating ring, thereby playing a role in improving the yield rate of the battery and improving the service life of the battery.

[0012] Thus, the battery cover plate provided by the embodiments of the present application can solve the problem that the insulating ring is prone to brittle fracture under high and low temperature impacts, resulting in a low yield rate of the battery and a short service life of the battery.

[0013] In a feasible implementation manner, the cover plate includes a first portion and a second portion, the second portion is connected to the circumference of the first portion, and a portion of the first portion is located in the inner ring of the insulating ring.

[0014] The battery cover of this structure has a second part for supporting the cover, and the second part can be fixedly connected to the insulating ring to limit the offset between the cover and the insulating ring, thereby improving the operating stability of the battery and extending the service life of the battery; the first part located on the inner circle of the insulating ring is used to connect with the battery core through the battery ear to form the positive or negative electrode of the battery.

[0015] In a possible implementation manner, the second portion has a first surface facing the insulating ring, and the first surface is connected to the insulating ring.

[0016] The first surface of the battery cover plate of this structure is connected to the insulating ring to achieve connection between the cover plate and the insulating ring, so that the insulating ring can support the cover plate.

[0017] In a feasible implementation manner, the buffer groove is located on a side of the second portion facing away from the first surface.

[0018] The battery cover of this structure has a first surface connected to an insulating ring. The deformation of the insulating ring will squeeze the first surface and cause the first surface to move toward the side away from the insulating ring. The buffer groove can accommodate the deformation of the first surface moving toward the side away from the insulating ring. By deforming the cover toward the opening of the buffer groove, the stress from the insulating ring squeezing the cover can be released, thereby reducing the occurrence of cracking of the insulating ring and providing safety protection for the insulating ring.

[0019] In a feasible implementation manner, at least one side wall surface of the buffer groove is coplanar with the surface at the connection point between the first part and the second part.

[0020] The battery cover of this structure releases the stress from the insulating ring squeezing the cover by deforming toward the opening direction of the buffer groove. The side surface of one side of the buffer groove is coplanar with the surface at the connection between the first part and the second part, which can reduce the difficulty of the cover deforming toward the opening direction of the buffer groove, thereby making it easier for the cover to deform, thereby shortening the time for the cover to deform, thereby reducing the occurrence of cracking of the insulating ring and providing safe protection for the insulating ring.

[0021] In a feasible implementation manner, the buffer groove is located on a side wall of the first portion facing away from the first surface.

[0022] For the battery cover plate of this structure, the first surface is connected to the insulating ring. The deformation generated by the insulating ring will squeeze the first surface and cause the first surface to move toward the side away from the insulating ring. The buffer groove can accommodate the deformation generated by the movement of the first surface toward the side away from the insulating ring. By causing the cover plate to deform in the opening direction of the buffer groove, the stress generated by the insulating ring squeezing the cover plate can be released, thereby reducing the occurrence of cracking of the insulating ring and providing safety protection for the insulating ring.

[0023] In a feasible implementation manner, the first part has a second surface facing the insulating ring, and the circumferential side of the second surface is connected to the insulating ring.

[0024] For the battery cover plate of this structure, the second surface is connected to the insulating ring to achieve the connection between the cover plate and the insulating ring, thereby enhancing the connection strength between the insulating ring and the cover plate.

[0025] In a feasible implementation manner, the buffer groove is located on the end surface of the second part away from the first surface.

[0026] For the battery cover plate of this structure, the second surface is connected to the insulating ring. The deformation generated by the insulating ring will squeeze the second surface and cause the second surface to move toward the side away from the insulating ring. The buffer groove can accommodate the deformation generated by the movement of the first surface toward the side away from the insulating ring. By causing the cover plate to deform in the opening direction of the buffer groove, the stress generated by the insulating ring squeezing the cover plate can be released, thereby reducing the occurrence of cracking of the insulating ring and providing safety protection for the insulating ring.

[0027] In a feasible implementation manner, the buffer groove is formed with a first wall surface, a second wall surface, and a third wall surface connected in sequence; the first wall surface and the third wall surface are arranged opposite to each other.

[0028] For the battery cover plate of this structure, one of the first wall surface and the third wall surface can deflect toward the other one of the first wall surface and the third wall surface with one end of the second wall surface as the rotation center, so that one of them deforms relative to the other one. The deformation can release the stress generated by the deformation of the insulating ring squeezing the cover plate, thereby reducing the occurrence of cracking of the insulating ring and providing safety protection for the insulating ring.

[0029] In a feasible implementation manner, the third wall surface is located on the side of the first wall surface away from the first part, and the plane where the first wall surface is located and the plane where the second surface is located are arranged coplanarly.

[0030] The battery cover of this structure releases the stress from the insulating ring squeezing the cover by deforming one of the first wall and the third wall relative to the other. The plane where the first wall is located is coplanar with the plane where the outer surface of the second part is located, which can reduce the difficulty of one of the first wall and the third wall being deformed relative to the other, thereby making the deformation process of the cover easier, thereby shortening the time for the cover deformation to occur, thereby reducing the occurrence of cracking of the insulating ring and safely protecting the insulating ring.

[0031] In a feasible implementation manner, the first wall surface and the third wall surface are spaced apart, and a maximum first interval D1 between the first wall surface and the third wall surface satisfies:

[0032] 0.2mm≤D1≤1.5mm.

[0033] In the battery cover of this structure, the spacing between the first wall and the third wall can accommodate the deformation of one of the first wall and the third wall relative to the other. If the maximum gap between the first wall and the third wall is less than 0.2 mm, the effect of accommodating the deformation due to the maximum gap will be poor; if the maximum gap between the first wall and the third wall is greater than 1.5 mm, the strength of the cover will be reduced.

[0034] In a feasible implementation manner, the second wall surface and the first surface are spaced apart, and a second interval D2 between the second wall surface and the first surface satisfies: D2 ≥ 0.3 mm.

[0035] In the battery cover of this structure, one of the first wall and the third wall can deflect toward the other of the first wall and the third wall with one side end of the second wall as the rotation center, so that one of the two is deformed relative to the other, and the deformation can release the stress generated by the deformation of the insulating ring and the extrusion of the cover. If the interval between the second wall and the first wall is less than 0.3 mm, when one of the first wall and the third wall deflects relative to the other, fatigue damage will occur on the side of the third wall on the cover facing away from the first wall, resulting in the occurrence of cover fracture.

[0036] In a feasible implementation manner, it further includes: a buffer portion, one end of the buffer portion is connected to the cover plate, and the other end of the buffer portion is connected to at least one of the first wall surface and an end of the third wall surface facing away from the second wall surface.

[0037] The arrangement of the buffer portion of the battery cover plate of this structure can reduce the occurrence of stress concentration on the cover plate, thereby improving the strength of the cover plate and extending the service life of the cover plate.

[0038] In a feasible implementation manner, the buffer portion is a circular chamfer, and the radius R of the circular chamfer satisfies: R≥1 mm.

[0039] For the battery cover plate of this structure, a circular chamfer is provided at the corner of the buffer groove. The circular chamfer is used to relieve the stress concentration at the corner of the buffer groove. If the radius of the circular chamfer is less than 1 mm, it will cause stress concentration at the corner of the buffer groove, resulting in the occurrence of fracture of the buffer groove.

[0040] In a feasible implementation manner, it further includes:

[0041] A connecting ring, which is used to connect the battery housing and the insulating ring.

[0042] For the battery cover plate of this structure, the setting of the connecting ring can reduce the connection difficulty between the insulating ring and the battery housing, thereby improving the processing efficiency between the battery cover plate and the battery housing.

[0043] The second aspect of the embodiments of the present application provides a battery, including a battery housing and a battery cover plate;

[0044] The battery cover plate is arranged on the battery housing.

[0045] The third aspect of the embodiments of the present application provides a battery pack, including a battery.

[0046] The fourth aspect of the embodiments of the present application provides an electrical device, including an electrical device, a battery or a battery pack, and the battery or the battery pack is used to provide electrical energy for the electrical device.

[0047] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, the other technical problems that can be solved by the battery cover plate, battery, battery pack and electrical device provided by the embodiments of the present application, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 It is a schematic diagram of the main structure of the battery seat provided by the embodiments of the present application;

[0050] Figure 2 It is an exploded structure diagram of the battery seat provided by the embodiments of the present application;

[0051] Figure 3 For Figure 1Schematic cross-sectional structure diagram at A-A in the figure.

[0052] Explanation of reference numerals in the drawings:

[0053] 100 - Insulating ring;

[0054] 200 - Cover plate; 201 - Buffer groove; 2011 - First wall surface; 2012 - Second wall surface; 2013 - Third wall surface; 202 - First part; 2021 - Second surface; 203 - Second part; 2031 - First surface; 204 - Buffer part;

[0055] D1 - First interval;

[0056] D2 - Second interval. Detailed implementation manners

[0057] A battery is a power source that provides power for a tool, and mostly refers to a storage battery or a rechargeable battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0058] Currently, a battery generally consists of structural components such as a cover plate 200 and an aluminum shell; an insulating ring 100 is provided between the cover plate 200 and the aluminum shell, and the insulating ring 100 is used to isolate the electrical connection between the cover plate 200 and the aluminum shell, and can provide safety protection for the inside of the aluminum shell.

[0059] In related technologies, the insulating ring 100 and the cover plate 200 are connected by brazing. The insulating ring 100 is made of a material with relatively high brittleness, and when the thermal expansion coefficient of the material of the cover plate 200 and the material of the insulating ring 100 differs greatly, under the impact of high and low temperatures, the insulating ring 100 is prone to brittle fracture, resulting in a low yield rate of the battery and a short service life of the battery.

[0060] It should be noted that in some aspects, after brazing is completed between the insulating ring 100 and the cover plate 200, when the insulating ring 100 and the cover plate 200 cool from the brazing temperature to room temperature, the insulating ring 100 and the cover plate 200 are prone to brittle fracture when cooling from high temperature to room temperature, thus reducing the yield rate of the battery. In other aspects, heat will be generated when the battery cover plate is working, and the heat will be conducted to the insulating ring 100, resulting in an increase in the temperature of the insulating ring 100. After the battery work is completed, the temperature of the insulating ring 100 drops to room temperature, thus shortening the service life of the battery.

[0061] Such as Figure 1As shown in the figure, for the battery cover plate provided by the embodiment of the present application, the insulating ring 100 is used for insulating connection between the battery housing and the cover plate 200, and the cover plate 200 is used to form the positive or negative electrode of the battery. The buffer groove 201 on the cover plate 200 can accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward one side of the cover plate 200 under high and low temperature impacts, and release the stress on the insulating ring 100, so as to reduce the occurrence of cracking of the insulating ring 100, thereby improving the yield rate of the battery and the service life of the battery.

[0062] As Figure 2 shown in the figure, the battery cover plate provided by the embodiment of the present application is used to be installed on the battery housing of the battery. The battery cover plate includes: an insulating ring 100 and a cover plate 200. The insulating ring 100 is used for connecting with the battery housing; the cover plate 200 is arranged on the insulating ring 100, and a buffer groove 201 is opened on the cover plate 200. The buffer groove 201 is used to accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward one side of the cover plate 200.

[0063] It should be noted that the buffer groove 201 has various different opening positions. The opening positions of the buffer groove 201 will be exemplified below in turn.

[0064] In a feasible implementation manner, the buffer groove 201 is opened on the side of the cover plate 200 close to the battery housing. The buffer groove 201 is used to accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward the side close to the battery housing, so as to reduce the occurrence of cracking of the insulating ring 100, thereby improving the yield rate of the battery and the service life of the battery.

[0065] As Figure 3 shown in the figure, in another feasible implementation manner, the buffer groove 201 is opened on the side of the cover plate 200 away from the battery housing. The buffer groove 201 is used to accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward the side away from the battery housing, so as to reduce the occurrence of cracking of the insulating ring 100, thereby improving the yield rate of the battery and the service life of the battery.

[0066] In addition, in another feasible implementation manner, two buffer grooves 201 are provided. One of the buffer grooves 201 is opened on the side of the cover plate 200 close to the battery housing. The buffer groove 201 is used to accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward the side close to the battery housing; the other buffer groove 201 is opened on the side of the cover plate 200 away from the battery housing. The buffer groove 201 is used to accommodate the deformation generated when the insulating ring 100 presses the cover plate 200 toward the side away from the battery housing. Thus, the setting of the buffer groove 201 can reduce the occurrence of cracking of the insulating ring 100, thereby improving the yield rate of the battery and the service life of the battery.

[0067] It is understandable that the opening position of the buffer groove 201 is not limited and can be selected according to actual usage requirements, as long as it is ensured that the buffer groove 201 can accommodate the deformation generated by the insulating ring 100 pressing the cover plate 200 on the side facing the cover plate 200.

[0068] Therefore, the battery cover plate provided by the embodiment of the present application can solve the problem that the insulating ring 100 is prone to brittle fracture under high and low temperature impacts, resulting in a low yield rate of the battery and a short service life of the battery.

[0069] The battery cover plate provided by the embodiment of the present application includes a first part 202 and a second part 203. The second part 203 is connected to the peripheral side of the first part 202, and a part of the first part 202 is located inside the inner ring of the insulating ring 100.

[0070] It should be noted that at least a part of the first part 202 is located inside the inner ring of the insulating ring 100. Another part of the first part 202 is connected to the second part 203. The second part 203 is connected to the insulating ring 100. The second part 203 is used to support the cover plate 200. The second part 203 can be fixedly connected to the insulating ring 100 to limit the offset between the cover plate 200 and the insulating ring 100, thereby improving the operating stability of the battery and extending the service life of the battery; the part of the first part 202 passing through the inner ring of the insulating ring 100 is used to connect to the battery core through the battery tab to form the positive or negative electrode of the battery.

[0071] It should be noted that the inner side wall of the second part 203 is connected to the outer peripheral wall of the first part 202. There are various different connection methods between the inner side wall of the second part 203 and the outer peripheral wall of the first part 202. The connection methods between the inner side wall of the second part 203 and the outer peripheral wall of the first part 202 will be exemplified below.

[0072] In a feasible implementation manner, the inner side wall of the second part 203 is welded and fixed on the outer peripheral wall of the first part 202. It is understandable that welding and fixing between the second part 203 and the first part 202 has the advantage of low processing difficulty, thereby improving the processing efficiency of the battery cover plate.

[0073] In another feasible implementation manner, the second part 203 and the first part 202 are processed by an integrated molding process. Along the depth direction of the cover plate 200, the first part 202 is located inside the second part 203; processing the second part 203 and the first part 202 by integrated molding has the advantage of large connection strength.

[0074] It is understandable that the specific connection manner between the inner sidewall of the second part 203 and the outer peripheral wall of the first part 202 is not limited and can be selected according to actual usage requirements, as long as it is ensured that the inner sidewall of the second part 203 is fixedly connected to the outer peripheral wall of the first part 202.

[0075] The second part 203 provided by the embodiment of the present application has a first surface 2031 facing the insulating ring 100, and the first surface 2031 is connected to the insulating ring 100.

[0076] It should be noted that the first surface 2031 is connected to the insulating ring 100 to achieve the connection between the cover plate 200 and the insulating ring 100, so that the insulating ring 100 can support the cover plate 200.

[0077] The buffer groove 201 provided by the embodiment of the present application is located on the side of the second part 203 facing away from the first surface 2031.

[0078] It should be noted that when the first surface 2031 is connected to the insulating ring 100, the deformation generated by the insulating ring 100 will squeeze the first surface 2031 and cause the first surface 2031 to move toward the side away from the insulating ring 100. The buffer groove 201 can accommodate the deformation generated by the movement of the first surface 2031 toward the side away from the insulating ring 100. By causing the cover plate 200 to deform in the opening direction of the buffer groove 201, the stress of the insulating ring 100 squeezing the cover plate 200 can be released, thereby reducing the occurrence of cracking of the insulating ring 100 to provide safety protection for the insulating ring 100.

[0079] At least one side surface of the buffer groove 201 provided by the embodiment of the present application is coplanar with the outer surface of the second part 203.

[0080] It is understandable that the cover plate 200 releases the stress of the insulating ring 100 squeezing the cover plate 200 by deforming in the opening direction of the buffer groove 201. The coplanarity of one side surface of the buffer groove 201 with the outer surface of the second part 203 can reduce the difficulty of the cover plate 200 deforming in the opening direction of the buffer groove 201, so that the deformation of the cover plate 200 occurs simply, thereby shortening the occurrence time of the deformation of the cover plate 200, and thus reducing the occurrence of cracking of the insulating ring 100 to provide safety protection for the insulating ring 100.

[0081] The buffer groove 201 provided by the embodiment of the present application is located on the side wall surface of the first part 202 facing away from the first surface 2031.

[0082] It can be understood that the first surface 2031 is connected to the insulating ring 100, and the deformation of the insulating ring 100 will squeeze the first surface 2031 and cause the first surface 2031 to move toward the side away from the insulating ring 100. The buffer groove 201 can accommodate the deformation of the first surface 2031 moving toward the side away from the insulating ring 100. By causing the cover plate 200 to deform toward the opening direction of the buffer groove 201, the stress from the insulating ring 100 squeezing the cover plate 200 can be released, thereby reducing the occurrence of cracking of the insulating ring 100 and providing safety protection for the insulating ring 100.

[0083] The first portion 202 provided in the embodiment of the present application has a second surface 2021 facing the insulating ring 100 , and the circumference of the second surface 2021 is connected to the insulating ring 100 .

[0084] It can be understood that the second surface 2021 is connected to the insulating ring 100 to achieve the connection between the cover plate 200 and the insulating ring 100 , thereby enhancing the connection strength between the insulating ring 100 and the cover plate 200 .

[0085] The buffer groove 201 provided in the embodiment of the present application is located on an end surface of the second portion 203 that is away from the first surface 2031 .

[0086] It can be understood that the second surface 2021 is connected to the insulating ring 100, and the deformation of the insulating ring 100 will squeeze the second surface 2021 and cause the second surface 2021 to move toward the side away from the insulating ring 100. The buffer groove 201 can accommodate the deformation of the first surface 2031 moving toward the side away from the insulating ring 100. By causing the cover plate 200 to deform toward the opening direction of the buffer groove 201, the stress from the insulating ring 100 squeezing the cover plate 200 can be released, thereby reducing the occurrence of cracking of the insulating ring 100 and providing safety protection for the insulating ring 100.

[0087] The buffer groove 201 provided in the embodiment of the present application is formed with a first wall surface 2011 , a second wall surface 2012 and a third wall surface 2013 which are connected in sequence, and the first wall surface 2011 and the third wall surface 2013 are arranged opposite to each other.

[0088] It should be noted that one end of the second wall 2012 is connected to the first wall 2011 , and the other end of the second wall 2012 is connected to the third wall 2013 . The first wall 2011 , the second wall 2012 and the third wall 2013 together enclose the buffer groove 201 .

[0089] It can be understood that one of the first wall 2011 and the third wall 2013 can be deflected toward the other of the first wall 2011 and the third wall 2013 with one side end of the second wall 2012 as the rotation center, so that one of the two is deformed relative to the other of the two, and the deformation can release the stress generated by the deformation of the insulating ring 100 and the extrusion of the cover plate 200, thereby reducing the occurrence of cracks in the insulating ring 100 and providing safe protection for the insulating ring 100.

[0090] The third wall surface 2013 provided in the embodiment of the present application is located on a side of the first wall surface 2011 away from the first portion 202 , and the plane where the first wall surface 2011 is located and the plane where the second surface 2021 is located are arranged coplanarly.

[0091] It can be understood that the cover plate 200 releases the stress from the insulating ring 100 squeezing the cover plate 200 by deforming one of the first wall 2011 and the third wall 2013 relative to the other. The plane where the first wall 2011 is located is coplanar with the plane where the outer surface of the second part 203 is located, which can reduce the difficulty of one of the first wall 2011 and the third wall 2013 being deformed relative to the other, thereby making the deformation process of the cover plate 200 easier to occur, thereby shortening the time for the deformation of the cover plate 200, thereby reducing the occurrence of cracks in the insulating ring 100 and safely protecting the insulating ring 100.

[0092] It should be noted that the first wall surface 2011 and the third wall surface 2013 are spaced apart, and a maximum first interval D1 between the first wall surface 2011 and the third wall surface 2013 satisfies: 0.2 mm ≤ D1 ≤ 1.5 mm.

[0093] It can be understood that the spacing between the first wall 2011 and the third wall 2013 can accommodate the deformation of one of the first wall 2011 and the third wall 2013 relative to the other. If the maximum gap between the first wall 2011 and the third wall 2013 is less than 0.2 mm, the effect of accommodating the deformation due to the maximum gap will be poor; if the maximum gap between the first wall 2011 and the third wall 2013 is greater than 1.5 mm, the strength of the cover 200 will be reduced.

[0094] It should be noted that there are various specific implementations of the maximum distance between the first wall 2011 and the third wall 2013 . The specific implementations of the maximum distance between the first wall 2011 and the third wall 2013 are described below with examples.

[0095] In a feasible implementation, the maximum distance between the first wall surface 2011 and the third wall surface 2013 is 0.2 millimeters. The maximum distance between the first wall surface 2011 and the third wall surface 2013 can accommodate the offset of one of the first wall surface 2011 and the third wall surface 2013 relative to the other.

[0096] In another feasible implementation, the maximum distance between the first wall surface 2011 and the third wall surface 2013 is 1.5 millimeters. The maximum distance between the first wall surface 2011 and the third wall surface 2013 can accommodate the offset of one of the first wall surface 2011 and the third wall surface 2013 relative to the other.

[0097] It can be understood that there are no restrictions on the specific implementation of the maximum distance between the first wall surface 2011 and the third wall surface 2013, and it can be selected according to actual usage requirements, as long as the maximum distance D1 between the first wall surface 2011 and the third wall surface 2013 satisfies: 0.2mm ≤ D1 ≤ 1.5mm.

[0098] In the embodiment of the present application, the second wall surface 2012 and the first surface 2031 are spaced apart, and the second distance D2 between the second wall surface 2012 and the first surface 2031 satisfies: D2 ≥ 0.3mm.

[0099] It should be noted that one of the first wall surface 2011 and the third wall surface 2013 can rotate around the end of one side of the second wall surface 2012 and deflect towards the other of the first wall surface 2011 and the third wall surface 2013, so that one of them deforms relative to the other. The deformation can release the stress generated by the deformation of the insulating ring 100 pressing on the cover plate 200. If the distance between the second wall surface 2012 and the first surface 2031 is less than 0.3 millimeters, when one of the first wall surface 2011 and the third wall surface 2013 deflects relative to the other, fatigue damage will occur on the side of the third wall surface 2013 of the cover plate 200 facing away from the first wall surface 2011, resulting in the fracture of the cover plate 200.

[0100] It should be noted that there are various specific implementations of the distance between the second wall surface 2012 and the first surface 2031. The specific implementations of the distance between the second wall surface 2012 and the first surface 2031 will be exemplified below.

[0101] In a feasible implementation, the distance between the second wall surface 2012 and the first surface 2031 is 0.3 millimeters. The distance between the second wall surface 2012 and the first surface 2031 is used to connect the cover plates 200 on both sides of the buffer groove 201 to improve the connection strength of the cover plates 200 on both sides of the buffer groove 201.

[0102] In another feasible embodiment, the interval between the second wall 2012 and the first surface 2031 is 0.35 mm, and the interval between the second wall 2012 and the first surface 2031 is used to connect the cover plates 200 on both sides of the buffer groove 201 to improve the connection strength of the cover plates 200 on both sides of the buffer groove 201.

[0103] It is understandable that the specific implementation of the interval between the second wall 2012 and the first surface 2031 is not limited and can be selected according to actual use requirements. It only needs to ensure that the second interval D2 between the second wall 2012 and the first surface 2031 satisfies: D2 ≥ 0.3 mm.

[0104] The battery cover provided in the embodiment of the present application further includes: a buffer portion 204 , one end of the buffer portion 204 is connected to the cover 200 , and the other end of the buffer portion 204 is connected to at least one of the first wall 2011 and the end of the third wall 2013 away from the second wall 2012 .

[0105] It should be noted that the provision of the buffer portion 204 can reduce the occurrence of stress concentration on the cover plate 200 , thereby improving the strength of the cover plate 200 and extending the service life of the cover plate 200 .

[0106] It should be noted that the buffer portion 204 has a variety of different installation positions. The installation positions of the buffer portion 204 are described below with examples one by one.

[0107] In a feasible embodiment, one end of the buffer portion 204 is connected to the cover plate 200, and the other end of the buffer portion 204 is connected to an end of the first wall 2011 away from the second wall 2012; the buffer portion 204 is used to reduce the occurrence of stress concentration between the cover plate 200 and the first wall 2011, thereby improving the connection strength between the cover plate 200 and the first wall 2011, so as to reduce the occurrence of fracture at the connection between the cover plate 200 and the first wall 2011.

[0108] In another feasible embodiment, one end of the buffer portion 204 is connected to the cover plate 200, and the other end of the buffer portion 204 is connected to an end of the third wall 2013 away from the second wall 2012; the buffer portion 204 is used to reduce the occurrence of stress concentration between the cover plate 200 and the third wall 2013, thereby improving the connection strength between the cover plate 200 and the third wall 2013, so as to reduce the occurrence of fracture at the connection between the cover plate 200 and the third wall 2013.

[0109] In addition, in other feasible embodiments, there are two buffer portions 204. One end of one buffer portion 204 is connected to the cover plate 200, and the other end of the buffer portion 204 is connected to one end of the first wall surface 2011 facing away from the second wall surface 2012. The buffer portion 204 is used to reduce the occurrence of stress concentration between the cover plate 200 and the first wall surface 2011, thereby improving the connection strength between the cover plate 200 and the first wall surface 2011, so as to reduce the occurrence of fracture at the connection between the cover plate 200 and the first wall surface 2011. One end of the other buffer portion 204 is connected to the cover plate 200, and the other end of the buffer portion 204 is connected to one end of the third wall surface 2013 facing away from the second wall surface 2012. The buffer portion 204 is used to reduce the occurrence of stress concentration between the cover plate 200 and the third wall surface 2013, thereby improving the connection strength between the cover plate 200 and the third wall surface 2013, so as to reduce the occurrence of fracture at the connection between the cover plate 200 and the third wall surface 2013.

[0110] It can be understood that the setting position of the buffer portion 204 is not limited and can be selected according to actual usage requirements.

[0111] The buffer portion 204 provided in the embodiment of the present application is a circular chamfer, and the radius R of the circular chamfer satisfies: R≥1mm.

[0112] It should be noted that the circular chamfer is provided at the corner of the buffer groove 201, and the circular chamfer is used to slow down the stress concentration at the corner of the buffer groove 201. If the radius of the circular chamfer is less than 1 millimeter, it will cause stress concentration at the corner of the buffer groove 201, resulting in the occurrence of fracture of the buffer groove 201.

[0113] It should be noted that there are various setting methods for the radius of the circular chamfer provided in the embodiment of the present application. The setting methods of the radius of the circular chamfer will be exemplified below in turn.

[0114] In a feasible embodiment, the radius of the circular chamfer is 1 millimeter. The setting of the circular chamfer can reduce the occurrence of stress concentration between the cover plate 200 and the buffer groove 201, thereby improving the strength of the cover plate 200 and extending the service life of the battery cover plate.

[0115] In another feasible embodiment, the radius of the circular chamfer is 1.5 millimeters. The setting of the circular chamfer can reduce the occurrence of stress concentration between the cover plate 200 and the buffer groove 201, thereby improving the strength of the cover plate 200 and extending the service life of the battery cover plate.

[0116] It can be understood that the setting method of the radius of the circular chamfer is not limited and can be selected according to actual usage requirements, as long as it is ensured that the radius R of the circular chamfer satisfies: R≥1mm.

[0117] The battery cover plate provided by the embodiment of the present application further includes: a connecting ring, and the connecting ring is used to connect the battery case and the insulating ring.

[0118] It should be noted that there are various different connection methods between the connecting ring and the insulating ring 100. The connection methods between the connecting ring and the insulating ring 100 will be exemplified below in turn.

[0119] In a feasible embodiment, the connecting ring and the insulating ring 100 are fixedly connected by brazing; using brazing connection can reduce the connection thickness between the connecting ring and the insulating ring 100, thereby playing a role in reducing the occupation of external space.

[0120] In another feasible embodiment, the connecting ring and the insulating ring 100 are adhesively bonded with glue. Using glue bonding has the advantage of convenient connection, thereby playing a role in improving the installation efficiency of the connecting ring and the insulating ring 100.

[0121] In addition, in other feasible embodiments, the connecting ring and the insulating ring 100 are connected by hot melting. Using hot melting connection has the advantages of strong connection stability and batch processing, and can improve the processing efficiency between the connecting ring and the insulating ring 100.

[0122] It can be understood that the specific connection method between the connecting ring and the insulating ring 100 is not limited, and can be selected according to actual use requirements, as long as the connecting ring and the insulating ring 100 are fixedly connected.

[0123] It should be noted that the connecting member and the battery case are connected by low-temperature welding. Low-temperature welding can reduce the damage to the electrode core and electrode tab in the battery case caused by high temperature, so as to protect the electrode core and electrode tab in the battery case safely, improve the connection efficiency between the battery case and the connecting member, and thus improve the yield rate of the battery pack.

[0124] It should be noted that the connecting ring is a metal ring. The setting of the metal ring can reduce the connection difficulty between the connecting ring and the battery case, thereby improving the processing efficiency between the battery cover plate and the battery case.

[0125] The embodiment of the present application provides a battery, including a battery case and the battery cover plate provided by the above embodiment, and the battery cover plate is arranged on the battery case.

[0126] The embodiment of the present application provides a battery pack, including the battery provided by the above embodiment.

[0127] The embodiment of the present application further provides an electrical device, including an electrical device, the battery described in any of the above embodiments or the battery pack described in any of the above embodiments, and the battery or the battery pack is used to provide electrical energy for the electrical device.

[0128] The electrical equipment in the embodiments of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0129] In addition, the electrical equipment can also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships, and spacecrafts, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles, or spaceships.

[0130] Since the electrical equipment in this embodiment includes the battery or battery pack described in any of the above embodiments, therefore, the electrical equipment includes the battery or battery pack structure and beneficial effects, which will not be elaborated herein in this embodiment.

[0131] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0132] It should be noted that the embodiments referred to as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. in the specification may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Furthermore, when combining specific features, structures, or characteristics with an embodiment, implementing such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described, is within the knowledge scope of those skilled in the art.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover plate, characterized in that, For installation on the battery housing of a battery, the battery cover plate includes: An insulating ring (100) for connecting to the battery housing; A cover plate (200) disposed on the insulating ring (100); Wherein, a buffer groove (201) is formed on the cover plate (200), and the buffer groove (201) is located on at least one side surface of the cover plate (200) close to or away from the battery housing.

2. The battery cover plate according to claim 1, characterized in that, The cover plate (200) includes a first part (202) and a second part (203), the second part (203) is connected to the peripheral side of the first part (202), and a part of the first part (202) is located inside the inner ring of the insulating ring (100).

3. The battery cover plate according to claim 2, wherein, The second part (203) has a first surface (2031) facing the insulating ring (100), and the first surface (2031) is connected to the insulating ring (100).

4. A battery cover plate according to claim 3, wherein, The buffer groove (201) is located on a side of the second part (203) away from the first surface (2031).

5. A battery cover plate according to claim 2, characterized in that, At least one side wall surface of the buffer groove (201) is coplanar with the surface where the connection between the first part (202) and the second part (203) is located.

6. The battery cover plate according to claim 3, characterized in that, The buffer groove (201) is located on a side wall surface of the first part (202) away from the first surface (2031).

7. A battery cover plate according to claim 3, characterized in that, The first part (202) has a second surface (2021) facing the insulating ring (100), and the peripheral side of the second surface (2021) is connected to the insulating ring (100).

8. A battery cover plate according to claim 7, characterized in that, The buffer groove (201) is located on an end surface of the second part (203) away from the first surface (2031).

9. A battery cover plate according to claim 7, characterized in that, The buffer groove (201) is formed with a first wall surface (2011), a second wall surface (2012) and a third wall surface (2013) connected in sequence; the first wall surface (2011) and the third wall surface (2013) are oppositely arranged.

10. A battery cover plate according to claim 9, characterized in that, The third wall surface (2013) is located on a side of the first wall surface (2011) away from the first part (202), and the plane where the first wall surface (2011) is located and the plane where the second surface (2021) is located are coplanar.

11. A battery cover plate according to claim 9, characterized in that, The first wall surface (2011) and the third wall surface (2013) are spaced apart, and the maximum first interval D1 between the first wall surface (2011) and the third wall surface (2013) satisfies: 0.2mm ≤ D1 ≤ 1.5mm.

12. The battery cover plate according to claim 9, wherein, The second wall surface (2012) and the first surface (2031) are spaced apart, and the second interval D2 between the second wall surface (2012) and the first surface (2031) satisfies: D2 ≥ 0.3mm.

13. A battery cover plate according to claim 9, characterized in that, It further includes: A buffer part (204), one end of the buffer part (204) is connected to the cover plate (200), and the other end of the buffer part (204) is connected to at least one of the ends of the first wall surface (2011) and the third wall surface (2013) away from the second wall surface (2012).

14. A battery cover plate according to claim 13, characterized in that, The buffer part (204) is a circular chamfer, and the radius R of the circular chamfer satisfies: R ≥ 1mm.

15. A battery cover plate according to any one of claims 1-14, characterized in that, It further includes: A connecting ring for connecting the battery housing and the insulating ring (100).

16. A battery, characterized in that, Comprising a battery housing and a battery cover plate according to any one of claims 1-15; The battery cover plate is disposed on the battery housing.

17. A battery pack, characterized in that, Comprising a battery according to claim 16.

18. An electrical device, characterized in that, Comprising an electrical device, a battery according to claim 16 or a battery pack according to claim 17, the battery or the battery pack being used to supply electrical energy to the electrical device.

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