End plate, battery, vehicle and electric equipment

Abstract

The utility model discloses an end plate, a battery, a vehicle and electric equipment, and belongs to the technical field of batteries. The end plate is applied to the battery and is used for being mounted at the end part of a battery monomer group, the end plate comprises an end plate body, the end plate body is provided with a first surface facing the battery monomer group and a second surface opposite to the first surface, the second surface is provided with a thinning groove, and the opening of the thinning groove faces the direction opposite to the first surface. In the breathing repeated expansion process of the battery monomer group, the end plate body can enlarge the expansion space of the battery monomer group during breathing through deformation, so that the extrusion damage of stress concentration to the battery monomer group is reduced, the lithium precipitation problem of the battery monomer group close to the end plate is relieved or eliminated, meanwhile, the stress uniformity of the battery monomer group can be improved, and the service life of the battery monomer group is prolonged. And the extrusion damage of stress concentration to the battery monomer group is reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to an end plate, a battery, a vehicle, and an electrical device. Background Art

[0002] The emergence of new energy vehicles has significantly boosted both social development and environmental protection. Power batteries, rechargeable batteries, are the power source for new energy vehicles and are widely used in this sector. With the continuous advancement of battery technology, the requirements for battery safety and stability are becoming increasingly stringent. As a crucial component of the battery pack, the structure and performance of the battery end plate significantly impact the overall performance of the battery. Traditional battery end plates suffer from structural issues and are unable to meet the demands of modern battery technology. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes an end plate, battery, vehicle, and electrical equipment that can mitigate or eliminate the problem of lithium plating in the battery cell group near the end plate, while also improving the uniformity of stress on the battery cell group and reducing stress concentration and extrusion damage to the battery cell group.

[0004] In the first aspect, the present application provides an end plate for use in a battery, wherein the end plate is used to be installed at the end of a battery cell group, and the end plate comprises: an end plate body, wherein the end plate body has a first surface facing the battery cell group and a second surface arranged opposite to the first surface, wherein the second surface is provided with a thinning groove, and the notch of the thinning groove faces in a direction away from the first surface.

[0005] According to the end plate of the present application, by setting a thinning groove on the second side of the end plate away from the battery cell group, and the notch of the thinning groove is facing the direction away from the first side, on the one hand, the stiffness of the end plate body can be reduced to increase the deformation of the end plate body, and during the repeated expansion of the battery cell group, the end plate body can increase the expansion space of the battery cell group during breathing by deforming, reduce the extrusion damage of the battery cell group caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group close to the end plate, and reduce the cost at the same time; on the other hand, by facing the first side without the thinning groove towards the battery cell group, the first side can be in contact with the battery cell group during the repeated expansion of the battery cell group, and the plane setting can improve the uniformity of the force on the battery cell group and reduce the extrusion damage of the battery cell group caused by stress concentration.

[0006] According to one embodiment of the present application, the bottom of the thinning groove includes a first segment and two second segments distributed on both sides of the first segment along the height direction, the thickness of the first segment is less than the thickness of the second segment, and the thickness of the second segment monotonically decreases from away from the first segment to close to the first segment.

[0007] According to one embodiment of the present application, the second surface and / or the first surface is provided with reinforcing ribs, and the reinforcing ribs are arranged at intervals along the height direction.

[0008] According to one embodiment of the present application, a limiting protrusion is provided at the bottom of the thinning groove.

[0009] According to one embodiment of the present application, it satisfies: L1<L2;

[0010] Wherein, L1 is the height of the limiting protrusion protruding from the bottom of the thinning groove, and L2 is the depth of the thinning groove.

[0011] According to one embodiment of the present application, the second surface is provided with a reinforcement structure, and the reinforcement structure is located in an area of ​​the second surface close to the top.

[0012] According to one embodiment of the present application, the reinforcement structure includes a frame and support ribs arranged in the frame, and the support ribs are connected to opposite side walls of the frame.

[0013] According to one embodiment of the present application, the reinforcement structure includes a plurality of reinforcement structures, and the plurality of reinforcement structures are arranged at intervals along the extension direction of the second surface.

[0014] According to one embodiment of the present application, the end plate further comprises a raised rib, the raised rib extending along the extension direction of the end plate, and the raised rib is arranged near the lower end of the end plate;

[0015] The raised ribs are arranged on the first surface and / or the second surface.

[0016] In a second aspect, the present application provides a battery comprising the end plate described in any of the above embodiments.

[0017] According to the battery provided in the embodiment of the present application, by setting the above-mentioned end plate, a thinning groove is set on the second side of the end plate away from the battery cell group, and the notch of the thinning groove is facing the direction away from the first side. On the one hand, the stiffness of the end plate body can be reduced to increase the deformation of the end plate body. During the repeated expansion of the battery cell group, the end plate body can increase the expansion space of the battery cell group during breathing by deforming, reduce the extrusion damage of the battery cell group caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group close to the end plate, and reduce costs at the same time. On the other hand, by facing the first side without the thinning groove towards the battery cell group, the first side can be in contact with the battery cell group during the repeated expansion of the battery cell group. Due to the setting of the plane, the uniformity of the force on the battery cell group can be improved, and the extrusion damage of the battery cell group caused by stress concentration can be reduced.

[0018] In a third aspect, the present application provides a vehicle comprising the end plate described in any one of the above embodiments.

[0019] According to the vehicle provided in the embodiment of the present application, the reliability of the battery can be improved by setting the end plate of the battery mentioned above. Specifically, a thinning groove is set on the second side of the end plate away from the battery cell group, and the notch of the thinning groove is facing the direction away from the first side. On the one hand, the stiffness of the end plate body can be reduced to increase the deformation of the end plate body. During the repeated expansion of the battery cell group, the end plate body can increase the expansion space of the battery cell group during breathing by deforming, reduce the extrusion damage of the battery cell group caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group close to the end plate, and reduce the cost at the same time. On the other hand, by facing the first side without the thinning groove towards the battery cell group, the first side can be in contact with the battery cell group during the repeated expansion of the battery cell group. Due to the setting of the plane, the uniformity of the force on the battery cell group can be improved, and the extrusion damage of the battery cell group caused by stress concentration can be reduced.

[0020] In a fourth aspect, the present application provides an electrical device comprising the end plate described in any of the above embodiments.

[0021] According to the electrical equipment provided in the embodiment of the present application, the reliability of the battery can be improved by setting the end plate of the above-mentioned battery. Specifically, a thinning groove is set on the second side of the end plate away from the battery cell group, and the notch of the thinning groove is facing the direction away from the first side. On the one hand, the stiffness of the end plate body can be reduced to increase the deformation of the end plate body. During the repeated expansion of the battery cell group, the end plate body can increase the expansion space of the battery cell group during breathing by deforming, reduce the extrusion damage of the battery cell group caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group close to the end plate, and reduce the cost at the same time. On the other hand, by facing the first side without the thinning groove towards the battery cell group, the first side can be in contact with the battery cell group during the repeated expansion of the battery cell group. Due to the setting of the plane, the uniformity of the force on the battery cell group can be improved, and the extrusion damage of the battery cell group caused by stress concentration can be reduced.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of the structure of the battery provided in the embodiment of the present application;

[0025] Figure 2 yes Figure 1 Cross-section at AA;

[0026] Figure 3 This is one of the structural diagrams of the end plate body provided in the embodiment of the present application;

[0027] Figure 4 yes Figure 3 Cross-section at BB;

[0028] Figure 5 This is the second structural diagram of the end plate body provided in the embodiment of the present application;

[0029] Figure 6 This is the third structural schematic diagram of the end plate body provided in the embodiment of the present application.

[0030] Reference numerals:

[0031] End plate body 1, first surface 11, second surface 12, thinning groove 121, first section 1211, second section 1212, limiting protrusion 122, reinforcement structure 123, frame 1231, supporting ribs 1232, reinforcement ribs 13, protruding ribs 14; battery cell group 2, battery box 3. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0033] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0034] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0035] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0036] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0037] In recent years, the emergence of new energy vehicles has significantly boosted both social development and environmental protection. Power batteries, rechargeable batteries, are the power source for new energy vehicles and are widely used in this sector. With the continuous advancement of battery technology, the requirements for battery safety and stability are becoming increasingly stringent. As a crucial component of the battery pack, the structure and performance of the battery end plate have a significant impact on the overall performance of the battery.

[0038] In the related art, the battery cells inside the battery cell group are spaced apart, and the end battery cells of the battery cell group are arranged close to the end plate. The applicant has observed that the battery cells inside the battery cell group do not normally deposit lithium after cyclic expansion, indicating that the spacing between the battery cells inside the battery cell group can meet the expansion space required by the battery cells, while the battery cells arranged close to the end plate will deposit lithium after cyclic expansion, indicating that the expansion space required for the battery cells arranged close to the end plate is insufficient.

[0039] Reference below Figures 1-6 An end plate, a battery, a vehicle, and an electric device according to embodiments of the present application are described.

[0040] like Figure 1 、 Figure 2 and Figure 4 As shown, the end plate of the embodiment of the present application is applied to the battery, and the end plate is used to be installed at the end of the battery cell group 2. The end plate includes: an end plate body 1, the end plate body 1 has a first surface 11 facing the battery cell group 2 and a second surface 12 arranged opposite to the first surface 11, and the second surface 12 is provided with a thinning groove 121, and the notch of the thinning groove 121 is facing away from the first surface 11.

[0041] Among them, Figure 4 As shown, the end plate body 1 includes two surfaces: the first surface 11 faces the battery cell group 2 and is used to be in close contact with the battery cell. The first surface 11 can be a plane. The first surface 11 can be in contact with the battery cell group 2 during the repeated expansion of the battery cell group 2. Due to the setting of the plane, the uniformity of the force on the battery cell group 2 can be improved, and the extrusion damage to the battery cell group 2 caused by stress concentration can be reduced.

[0042] The second surface 12 faces away from the battery cell group 2 and is used to connect to an external structure or serve as an installation surface. The second surface 12 is provided with a thinning groove 121. The thickness of the second surface 12 in the area where the thinning groove 121 is provided is thinner than that in other areas, and the structural rigidity is relatively small. The setting of the thinning groove 121 can increase the deformation of the end plate body 1. During the repeated expansion of the battery cell group 2 during breathing, the end plate body 1 can increase the expansion space of the battery cell group 2 during breathing by deforming, reduce the extrusion damage of the battery cell group 2 caused by stress concentration, and slow down or eliminate the lithium plating problem of the battery cell group 2 close to the end plate.

[0043] There can be one or more thinning grooves 121. When there is only one thinning groove 121, the thickness of other areas of the second surface 12 except the thinning groove 121 is greater than the thickness of the bottom of the thinning groove 121, which can make the end plate body 1 have a certain structural strength and improve the rebound ability of the end plate body 1; when there are multiple thinning grooves 121, multiple thinning grooves 121 are distributed at intervals on the second surface 12, and the thickness of the second surface 12 located between the multiple thinning grooves 121 is greater than the thickness of the bottom of the thinning groove 121. In other words, multiple ribs are distributed on the second surface 12, and the ribs can make the end plate body 1 have a certain structural strength and improve the rebound ability of the end plate body 1.

[0044] like Figure 3 As shown, when there is only one thinning groove 121, the thinning groove 121 can extend along the length direction of the end plate body 1. When there are multiple thinning grooves 121, the multiple thinning grooves 121 can be arranged along the length direction of the end plate body 1 to provide expansion space for the multiple battery cells at the end of the battery cell group 2.

[0045] Among them, the number and specifications of the end plate bodies 1 are determined according to the specifications of the battery box 3. For example, taking the battery box 3 as a rectangular parallelepiped, two end plate bodies 1 can be provided, and the two end plate bodies 1 can be arranged opposite to each other along the width direction of the battery box 3.

[0046] In this embodiment, the second surface 12 is a contact surface with the crossbeam. When the middle portion of the battery cell of the battery cell group 2 expands, the second surface 12 can undergo a large deformation due to the thinning groove 121, thereby forming an expansion space for the battery cell group 2.

[0047] The deformation area of ​​the thinning groove 121 may be designed based on the expansion amount of the battery cell group 2 after simulation or actual measurement.

[0048] According to the end plate provided in the embodiment of the present application, by setting a thinning groove 121 on the second side 12 of the end plate away from the battery cell group 2, and the notch of the thinning groove 121 is facing the direction away from the first side 11, on the one hand, the stiffness of the end plate body 1 can be reduced to increase the deformation of the end plate body 1, and during the repeated expansion of the battery cell group 2 during breathing, the end plate body 1 can increase the expansion space of the battery cell group 2 during breathing by deforming, reduce the squeezing damage of the battery cell group 2 caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group 2 close to the end plate, and reduce the cost at the same time; on the other hand, by facing the first side 11 without the thinning groove 121 towards the battery cell group 2, the first side 11 can contact the battery cell group 2 during the repeated expansion of the battery cell group 2 during breathing. Due to the plane setting, the uniformity of the force on the battery cell group 2 can be improved, and the squeezing damage of the battery cell group 2 caused by stress concentration can be reduced.

[0049] In some embodiments, the center thickness of the bottom of the thinning groove 121 is smaller than the thickness around the bottom of the thinning groove 121, the stiffness at the center of the bottom of the thinning groove 121 is smaller than the stiffness around the bottom of the thinning groove 121, and the deformation ability at the center of the bottom of the thinning groove 121 is smaller than the deformation ability around the bottom of the thinning groove 121. This can not only improve the deformation ability of the end plate body 1, but also make the end plate body 1 have a certain stiffness, thereby extending the service life of the end plate body 1.

[0050] In some embodiments, as Figure 3 and Figure 4 As shown, the bottom of the thinning groove 121 includes a first section 1211 and two second sections 1212 distributed on both sides of the first section 1211 along the height direction. The thickness of the first section 1211 is less than the thickness of the second section 1212, and the thickness of the second section 1212 monotonically decreases from far away from the first section 1211 to close to the first section 1211.

[0051] In this embodiment, the center thickness of the bottom of the thinning groove 121 is smaller than the thickness of the upper and lower sides of the bottom of the thinning groove 121, the stiffness of the center of the bottom of the thinning groove 121 is smaller than the stiffness of the upper and lower sides of the bottom of the thinning groove 121, and the deformation ability of the center of the bottom of the thinning groove 121 is smaller than the deformation ability of the upper and lower sides of the bottom of the thinning groove 121. This can not only improve the deformation ability of the end plate body 1, but also make the end plate body 1 have a certain stiffness, thereby extending the service life of the end plate body 1.

[0052] In some embodiments, as Figure 5 As shown, the second surface 12 is provided with reinforcing ribs 13 .

[0053] In this embodiment, the reinforcing ribs 13 are arranged at intervals along the height direction, and the reinforcing ribs 13 extend along the length direction of the end plate body 1 to enhance the bending and torsional resistance of the end plate body 1. Compared with the solution in which the reinforcing ribs 13 are arranged on the first surface 11, the uniformity of the force applied to the battery cell group 2 can be improved, and the extrusion damage to the battery cell group 2 caused by stress concentration can be reduced.

[0054] The number and position of the reinforcing ribs 13 are optimized according to the size and load-bearing requirements of the end plate body 1 to improve the overall structural strength of the end plate body 1 and reduce the deformation of the battery box 3.

[0055] In some embodiments, as Figure 6 As shown, the first surface 11 is provided with reinforcing ribs 13 .

[0056] In this embodiment, the reinforcing ribs 13 are arranged at intervals along the height direction, and the reinforcing ribs 13 extend along the length direction of the end plate body 1 to enhance the bending and torsional resistance of the end plate body 1 .

[0057] In some embodiments, as Figure 5 and Figure 6 As shown, both the first surface 11 and the second surface 12 are provided with reinforcing ribs 13 .

[0058] In this embodiment, the reinforcing ribs 13 on the first surface 11 and the reinforcing ribs 13 on the second surface 12 can be arranged correspondingly or staggered, both of which can enhance the bending and torsional resistance of the end plate body 1 .

[0059] In some embodiments, as Figure 3 、 Figure 4 and Figure 5 As shown, a limiting protrusion 122 is provided at the bottom of the thinning groove 121 .

[0060] In this embodiment, the limiting protrusion 122 is arranged in the first section 1211 of the bottom of the thinning groove 121. The top surface of the limiting protrusion 122 is used to be subjected to the expansion force when the battery cell group 2 expands to move in the direction away from the battery cell group 2. When the top surface of the limiting protrusion 122 stops against the cross beam of the battery box 3, the bottom of the thinning groove 121 stops deforming, thereby limiting the expansion amount of the battery cell group 2 and preventing further expansion of the battery cell, thereby slowing down or eliminating the problem of lithium plating in the battery cell.

[0061] There may be multiple limiting protrusions 122, and the multiple limiting protrusions 122 may be distributed at the bottom of the thinning groove 121 along the arrangement direction of the battery cell group 2. The positions of the multiple limiting protrusions 122 may be aligned with the multiple battery cells in the battery cell group 2 to limit the expansion amount of the multiple battery cells, prevent further expansion of the battery cells, and slow down or eliminate the problem of lithium plating in the battery cells.

[0062] The limiting protrusions 122 may include multiple rows, and the multiple rows of limiting protrusions 122 may be distributed at the bottom of the thinning groove 121 along the height direction of the battery cell group 2. The position of each column of limiting protrusions 122 may be aligned with the multiple battery cells in the battery cell group 2 to limit the expansion amount of the multiple battery cell groups 2, prevent further expansion of the battery cells, and thus slow down or eliminate the problem of lithium plating in the battery cells.

[0063] In this embodiment, when the battery cell group 2 expands to a certain stage, the top of the limiting protrusion 122 of the thinning groove 121 will contact the crossbeam, which can limit the further expansion of the battery cell group 2 and slow down or eliminate the problem of lithium deposition in the end battery cells of the battery cell group 2.

[0064] In some embodiments, as Figure 4 As shown, it satisfies: L1<L2; wherein L1 is the height of the limiting protrusion 122 protruding from the bottom of the thinning groove 121, and L2 is the depth of the thinning groove 121.

[0065] Among them, the top surface of the limiting protrusion 122 is lower than the second surface 12, and the distance between the top surface of the limiting protrusion 122 and the surface of the second surface 12 is the deformation height of the bottom of the thinning groove 121, which is also the deformation height of the corresponding battery cell. It can not only reserve expansion space for the battery cell group 2, but also limit the expansion amount of the battery cell group 2 to prevent further expansion of the battery cell, so as to slow down or eliminate the problem of lithium plating in the battery cell.

[0066] In some embodiments, as Figure 4 and Figure 5 As shown, the second surface 12 is provided with a reinforcement structure 123 , and the reinforcement structure 123 is located in an area near the top of the second surface 12 .

[0067] In this embodiment, the reinforcing structure 123 is located above the thinning groove 121 and avoids the crossbeam. The setting of the reinforcing structure 123 can reduce the deformation of the upper part of the end plate body 1, and reduce the situation where the battery cell group 2 and the integrated busbar are excessively deformed and broken due to excessive deformation of the upper part of the end plate body 1.

[0068] The reinforcement structure 123 may be a boss, a bump, or raised ribs 14 protruding from the second surface 12 .

[0069] The reinforcing structure 123 can be provided one continuously, and one reinforcing structure 123 extends along the length direction of the end plate body 1; the reinforcing structure 123 can be provided in plurality, and the plurality of reinforcing structures 123 are arranged along the length direction of the end plate body 1, and each of the plurality of reinforcing structures 123 can be provided at intervals, or several of the plurality of reinforcing structures 123 form a group, and each group is provided at intervals.

[0070] In some embodiments, as Figure 5 As shown, the reinforcement structure 123 includes multiple reinforcement structures 123, which are spaced apart along the extension direction of the second surface 12 to limit the expansion of the multiple battery cell groups 2, reduce the deformation of the upper part of the end plate body 1, and reduce the situation where the battery cell group 2 and the integrated busbar are excessively deformed and broken due to excessive deformation of the upper part of the end plate body 1.

[0071] In some embodiments, as Figure 5 As shown, the reinforcement structure 123 includes a frame body 1231 and support ribs 1232 disposed in the frame body 1231 , and the support ribs 1232 are connected to opposite side walls of the frame body 1231 .

[0072] Among them, the reinforcement structure 123 is set as a combined structure of a hollow frame 1231 and support ribs 1232, which can not only meet the structural strength requirements of the end plate body 1, but also reduce the weight of the end plate body 1 and save material costs.

[0073] The support ribs 1232 may be connected to the upper and lower side walls of the frame 1231 , and / or the support ribs 1232 may be connected to the left and right side walls of the frame 1231 , both of which may achieve a supporting effect and increase the strength of the reinforcing structure 123 .

[0074] The supporting ribs 1232 and the frame 1231 may be connected by integral molding or welding.

[0075] In some embodiments, as Figure 5 As shown, the end plate further includes a raised rib 14 , which extends along the extension direction of the end plate and is arranged near the lower end of the end plate; the raised rib 14 is arranged on the first surface 11 and / or the second surface 12 .

[0076] Among them, a raised rib 14 is provided at the lower end of the end plate, and the raised rib 14 extends along the extension direction of the end plate, which can reduce the bottom glue from crossing over the raised rib 14 to reach the upper part of the raised rib 14, thereby reducing the loss of bottom glue and causing glue shortage at the bottom, thereby improving the reliability of the battery.

[0077] The raised ribs 14 can be provided on the first surface 11 , or on the second surface 12 , or on both the first surface 11 and the second surface 12 , and both can achieve the effect of preventing glue from overflowing.

[0078] An embodiment of the present application further provides a battery, comprising the end plate in any of the above embodiments.

[0079] According to the battery provided in the embodiment of the present application, by setting the above-mentioned end plate, a thinning groove 121 is set on the second side 12 of the end plate away from the battery cell group 2, and the notch of the thinning groove 121 is facing the direction away from the first side 11. On the one hand, the rigidity of the end plate body 1 can be reduced to increase the deformation of the end plate body 1. During the repeated expansion and breathing of the battery cell group 2, the end plate body 1 can increase the expansion space of the battery cell group 2 during breathing by deforming, reduce the squeezing damage to the battery cell group 2 caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group 2 close to the end plate, and reduce costs at the same time; on the other hand, by facing the first side 11 without the thinning groove 121 towards the battery cell group 2, the first side 11 can contact the battery cell group 2 during the repeated expansion and breathing of the battery cell group 2. Due to the plane setting, the uniformity of the force on the battery cell group 2 can be improved, and the squeezing damage to the battery cell group 2 caused by stress concentration can be reduced.

[0080] An embodiment of the present application further provides a vehicle, comprising the end plate in any of the above embodiments.

[0081] According to the vehicle provided by the embodiment of the present application, by providing the end plate of the battery mentioned above, the reliability of the battery can be improved. Specifically, a thinning groove 121 is provided on the second side 12 of the end plate away from the battery cell group 2, and the notch of the thinning groove 121 is facing the direction away from the first side 11. On the one hand, the rigidity of the end plate body 1 can be reduced to increase the deformation of the end plate body 1. During the repeated expansion and breathing of the battery cell group 2, the end plate body 1 can increase the expansion space of the battery cell group 2 during breathing by deforming, reduce the squeezing damage to the battery cell group 2 caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group 2 close to the end plate, and reduce the cost at the same time. On the other hand, by facing the first side 11 without the thinning groove 121 towards the battery cell group 2, the first side 11 can contact the battery cell group 2 during the repeated expansion and breathing of the battery cell group 2. Due to the plane setting, the uniformity of the force on the battery cell group 2 can be improved, and the squeezing damage to the battery cell group 2 caused by stress concentration can be reduced.

[0082] An embodiment of the present application also provides an electrical device, comprising the end plate in any of the above embodiments.

[0083] According to the electrical equipment provided in the embodiment of the present application, by setting the end plate of the above-mentioned battery, the reliability of the battery can be improved. Specifically, a thinning groove 121 is set on the second side 12 of the end plate away from the battery cell group 2, and the notch of the thinning groove 121 is facing the direction away from the first side 11. On the one hand, the rigidity of the end plate body 1 can be reduced to increase the deformation of the end plate body 1. During the repeated expansion and breathing of the battery cell group 2, the end plate body 1 can increase the expansion space of the battery cell group 2 during breathing by deforming, reduce the squeezing damage to the battery cell group 2 caused by stress concentration, slow down or eliminate the lithium plating problem of the battery cell group 2 close to the end plate, and reduce the cost at the same time; on the other hand, by facing the first side 11 without the thinning groove 121 towards the battery cell group 2, the first side 11 can contact the battery cell group 2 during the repeated expansion and breathing of the battery cell group 2. Due to the plane setting, the uniformity of the force on the battery cell group 2 can be improved, and the squeezing damage to the battery cell group 2 caused by stress concentration can be reduced.

[0084] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0086] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0087] In the description of this application, “plurality” means two or more.

[0088] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0089] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0090] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0091] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An end plate, applied to a battery, wherein the end plate is used to be installed at the end of a battery cell group, characterized in that: include: an end plate body, the end plate body having a first surface facing the battery cell group and a second surface disposed opposite to the first surface, the second surface being provided with a thinning groove, the notch of the thinning groove being oriented away from the first surface; The bottom of the thinning groove includes a first section and two second sections distributed on both sides of the first section along the height direction. The thickness of the first section is smaller than that of the second section. The thickness of the second section decreases monotonically from far away from the first section to close to the first section.

2. The end plate according to claim 1, characterized in that The second surface and / or the first surface are provided with reinforcing ribs, and the reinforcing ribs are arranged at intervals along the height direction.

3. The end plate according to claim 1, wherein: A limiting protrusion is provided at the bottom of the thinning groove.

4. The end plate according to claim 3, characterized in that Satisfy: L1<L2; Wherein, L1 is the height of the limiting protrusion protruding from the bottom of the thinning groove, and L2 is the depth of the thinning groove.

5. The end plate according to claim 1, wherein: The second surface is provided with a reinforcement structure, and the reinforcement structure is located in an area of ​​the second surface close to the top.

6. The end plate according to claim 5, characterized in that The reinforcement structure includes a frame body and support ribs arranged in the frame body, and the support ribs are connected to opposite side walls of the frame body.

7. The end plate according to claim 5, characterized in that The reinforcement structure includes a plurality of reinforcement structures, and the plurality of reinforcement structures are arranged at intervals along the extension direction of the second surface.

8. The end plate according to claim 1, wherein: The end plate further includes a raised rib extending along an extension direction of the end plate, and the raised rib is arranged near a lower end of the end plate; The raised ribs are arranged on the first surface and / or the second surface.

9. A battery, characterized in that: The end plate comprises the end plate according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The end plate comprises the end plate according to any one of claims 1 to 8.

11. An electrical device, characterized in that: The end plate comprises the end plate according to any one of claims 1 to 8.

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