Battery module and end plate thereof

Abstract

The utility model provides a battery module and an end plate thereof, and relates to the technical field of batteries, the end plate of the battery module comprises an end plate main body, the end plate main body is provided with a first large surface, a second large surface and side surfaces located at two sides of the first large surface and the second large surface, the first large surface and the second large surface have the same shape, the area of the first large surface is larger than that of the second large surface, the first large surface is close to the battery cell group, the second large surface is far away from the battery cell group, and two sides of the two side surfaces are respectively connected with the first large surface and the second large surface; the side face comprises a first connecting face and a second connecting face connected with the first connecting face, the first connecting face is an inclined face, and the second connecting face is a plane; a plurality of first grooves are formed in the first connecting surface; the whole size of the end plate body is reduced, more space is provided for installation and layout of other components through the design of the inclined planes and the first grooves, the structure of the whole battery module is more compact, and the energy density of a battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery module and an end plate thereof. BACKGROUND

[0002] The new energy power battery industry will develop towards high energy density, so assembling battery cells into a battery module will become the future development trend of power batteries, and lightweight battery module structure will become an inevitable trend. As an important part of the battery pack, the technology of the battery module is particularly critical. A lightweight, high structural strength, high insulation protection, high flame retardant protection, and long service life battery module helps to improve the safety performance of the battery pack.

[0003] In the prior art, the standard battery module generally uses an aluminum hollow extrusion formed end plate. This end plate has high structural strength and light weight, but the space utilization rate is insufficient, which directly affects the maximum size of the battery cell available inside the module and indirectly affects the energy density.

[0004] Therefore, there is an urgent need to provide a battery module and an end plate thereof that can meet the strength requirements, have light weight, and also improve the space utilization rate, thereby improving the energy density of the battery pack. Practical new type content

[0005] The present application provides a battery module and an end plate thereof, which solves the problem of heavy weight and low space utilization rate of the current battery pack, so that the battery pack can meet the strength and quality requirements while improving the space utilization rate of the battery pack.

[0006] In a first aspect, the present application provides an end plate of a battery module, which is used in a battery module. The end plate comprises an end plate body, the end plate body has a first large face and a second large face and side faces located on both sides of the first large face and the second large face, the first large face and the second large face have the same shape and the area of the first large face is greater than the area of the second large face, the first large face is close to a battery cell group, the second large face is away from the battery cell group, and the two sides of the two side faces are connected with the first large face and the second large face respectively; the side face comprises a first connecting face and a second connecting face connected with the first connecting face, the first connecting face is an inclined face, and the second connecting face is a plane; a plurality of first grooves are arranged on the first connecting face.

[0007] By the above scheme, the first large face and the second large face have the same shape, and the area of the first large face is larger than that of the second large face, so that the first connecting face is provided on the two side faces of the end plate body, the first connecting face reduces the entire volume of the end plate body, thereby reducing the weight, which not only helps to improve the space utilization rate of the battery module, but also provides more space for the installation and layout of other components, so that the structure of the entire battery module is more compact and reasonable, and the energy density of the battery pack is improved. Moreover, the side face not only includes the first connecting face, but also includes a second connecting face connected with the first connecting face, so that the overall firmness of the end plate is ensured, and the second connecting face part can also serve as a basis for installing and fixing other components such as heat dissipation side cold plates, fixing supports, etc., so that the internal space layout of the battery module is further optimized, and the space utilization rate is improved. The design of the first connecting face also increases the surface area of the end plate, thereby improving the heat dissipation performance of the end plate, which helps to keep the temperature of the battery module within a reasonable range and prolong the service life of the battery. Further, the first recess is provided on the first connecting face, so that the material usage of the end plate is reduced, thereby effectively reducing the weight of the end plate, and the design of the first recess provides more space for the installation and layout of other components, so that the structure of the entire battery module is more compact and reasonable, thereby greatly improving the energy density of the battery pack.

[0008] In a possible design, the thickness of the end plate body is the straight-line distance from the first large face to the second large face, and the width of the second connecting face is greater than one-half of the thickness of the end plate body.

[0009] By the above scheme, the width of the second connecting face is greater than one-half of the thickness of the end plate body, which means that the second connecting face has a larger area and can better withstand the pressure and impact force from the battery cell group. This design makes the end plate have stronger compression resistance in the vertical direction, preventing the end plate from bending or deforming, thereby improving the structural strength and stability of the end plate. At the same time, the wider second connecting face also helps to disperse and transmit the pressure from the battery cell group, so that these forces are more evenly distributed in the main part of the end plate, further enhancing the load-bearing capacity of the end plate. The reasonable proportion and combination of the second connecting face and the first connecting face make the end plate have reduced volume and weight while ensuring stability and firmness.

[0010] In a possible design, the second large face is provided with a second recess, the first reinforcing rib and the second reinforcing rib are arranged in the second recess, and the first reinforcing rib and the second reinforcing rib are arranged alternately.

[0011] By the above scheme, by setting the second groove on the second large face, the material usage of the end plate is reduced, thereby effectively reducing the weight of the end plate. The design of the reinforcing ribs in the second groove can effectively enhance the local stiffness and deformation resistance of the end plate. The staggered arrangement of the first reinforcing ribs and the second reinforcing ribs can form a stable support structure, so that the end plate can better disperse and absorb the forces when subjected to external pressure or impact, preventing the end plate from bending or breaking, thereby significantly improving the structural strength of the end plate. The design of the second groove increases the surface area of the end plate, thereby increasing the contact area of the end plate with air and enhancing the heat dissipation performance of the end plate. The presence of the first reinforcing ribs and the second reinforcing ribs can also promote heat conduction and dissipation, so that heat can be more effectively transferred from the end plate to the surrounding environment, helping to keep the temperature of the battery module within a reasonable range and prolong the service life of the battery. The staggered arrangement of the first reinforcing ribs and the second reinforcing ribs can also form certain air flow channels to promote air flow and further improve heat dissipation efficiency.

[0012] In one possible design, the first reinforcing ribs and the second reinforcing ribs are perpendicular to each other, and the thickness of the first reinforcing ribs and the second reinforcing ribs is greater than or equal to 1mm.

[0013] By the above scheme, the first reinforcing ribs and the second reinforcing ribs are perpendicular to each other, which can change the stress distribution of the end plate, so that the stress is more evenly distributed in each part of the end plate, avoiding the occurrence of stress concentration phenomenon. This optimized stress distribution helps to improve the fatigue life of the end plate and reduce the risk of cracks and damage caused by stress concentration. The thickness of the first reinforcing ribs and the second reinforcing ribs is greater than or equal to 1mm, which ensures that they have sufficient stiffness and strength. Such thickness can effectively resist bending and deformation, so that the reinforcing ribs can remain stable when subjected to large loads, further enhancing the overall structural strength of the end plate.

[0014] In one possible design, a limiting boss is arranged on the end plate body, the limiting boss protrudes from the second large face, and the limiting boss is arranged on both sides of the binding belt.

[0015] By the above scheme, the limiting boss can effectively limit the position of the binding strap on the end plate, preventing the binding strap from shifting horizontally or vertically when subjected to external forces. This limiting effect ensures that the binding strap can always be tightly secured on the end plate, improving the fixing stability of the battery module and preventing the battery cell group from loosening or shifting during transportation or use. The presence of the limiting boss provides a clear positioning reference for the installation of the binding strap, allowing assembly personnel to quickly and accurately place the binding strap in the correct position. This convenient positioning method simplifies the assembly process, improves assembly efficiency, and reduces assembly time and labor intensity. Since the limiting boss can accurately limit the position of the binding strap, the installation position error of the binding strap during the assembly process can be effectively controlled. This helps to improve the assembly quality of the battery module and ensure its structural consistency and stability. The setting of the limiting boss can ensure that the installation position and method of the binding strap in different battery modules remain consistent, enhancing the standardization of the product.

[0016] In a possible design, the side surface further comprises a first transition surface and a second transition surface, the first transition surface being connected between the second large surface and the first connecting surface, and the second transition surface being connected between the first connecting surface and the second connecting surface, and the first transition surface and the second transition surface are curved surfaces.

[0017] By the above scheme, in the design of the end plate side surface, the first transition surface and the second transition surface are curved surfaces, respectively connected between the second large surface and the first connecting surface, and between the first connecting surface and the second connecting surface. This design helps to disperse the stress of the end plate acting on the binding strap. The curved transition makes the stress distribution more uniform in the contact area between the end plate and the binding strap, avoiding stress concentration. When the binding strap exerts pressure on the end plate, the curved surface can guide the stress to be smoothly transmitted and dispersed to a larger area along its arc shape, thereby reducing the local stress peak and reducing the risk of damage caused by stress concentration. Uniformly distributed stress helps to enhance the connection stability between the end plate and the binding strap. The binding strap has a more reliable fixing effect on the battery cell group, which can better resist external forces such as vibration and impact that may occur during transportation or use, ensuring the stability and safety of the battery cell group.

[0018] In a possible design, a third groove is provided on the second transition surface.

[0019] By the above scheme, by providing a groove on the second transition surface, the material usage of the end plate is reduced, thereby further reducing the overall weight of the end plate.

[0020] In a possible design, a first through hole is provided, which is located on the first connecting surface on both sides of the end plate body and communicates with the third groove.

[0021] By the above scheme, by setting the first through hole on the first connecting surface and communicating to the third groove, the space avoided by the first connecting surface is fully utilized, so that the cable tie can be set in the first through hole without occupying additional space, and the transition space between the first connecting surface and the second connecting surface of the end plate is utilized, avoiding additional holes or fixed structures in other parts of the end plate body. This can maintain the integrity and compactness of the end plate body, providing more space for the installation and layout of the battery cell group and other components, improving the overall space utilization of the battery module. By setting the first through hole on the first connecting surface, the fixing position of the cable tie is more coordinated with the structure layout of the end plate. This layout not only facilitates the installation and fixation of the cable tie, but also better disperses and transmits the pressure and stress from the cable tie, avoiding adverse effects on the end plate body structure, ensuring the structural stability and reliability of the battery module. Since the first through hole communicates with the third groove, the cable tie can conveniently pass through the first through hole and be fixed in the third groove, hiding the cable tie in the first through hole or the third groove, making the appearance of the end plate more neat and beautiful. The cable tie can provide uniform binding force, making the connection between the end plate and other components more tight and stable. This stable connection helps to resist vibrations and impacts that may occur during transportation or use, ensuring the long-term reliability of the battery module. Since the cable tie has a small volume, its setting in the first through hole does not occupy too much space, making the design of the end plate more compact. This also helps to improve the space utilization of the battery module, providing more space for the installation and layout of other components.

[0022] In one possible design, a second through hole is provided in the end plate body, which penetrates the upper top surface and the lower top surface of the end plate body.

[0023] By the above scheme, the second through hole provides flexible positioning and adjustment space for the installation of the long screw. Assemblers can choose appropriate screw length and installation position according to actual needs to adapt to battery modules of different sizes and structures. When the battery module needs to be lifted, transported or installed, the long screw can be used as a lifting point to lift the entire battery module by lifting equipment. This design simplifies the lifting process, reduces the dependence on other lifting tools, improves lifting efficiency and safety. At the same time, it also makes the transportation and installation of the battery module more convenient, reducing labor intensity and cost. The design of the second through hole fully utilizes the internal space of the end plate body, avoiding additional fixing or lifting structures on the surface of the end plate. This can maintain the neatness and beauty of the end plate surface, while also providing more space for the installation and layout of other components, improving the overall space utilization of the battery module.

[0024] In a second aspect, the present application provides a battery module, comprising a battery cell group and any of the above-mentioned end plates, the end plate being arranged at both ends of the battery cell group.

[0025] The battery module provided by the second aspect and possible designs of the second aspect has the advantages of the first aspect and possible designs of the first aspect, which will not be repeated here.

[0026] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 A top view schematic diagram of a end plate structure provided in the prior art.

[0029] Figure 2 A schematic diagram of a battery module provided by an embodiment of the present application.

[0030] Figure 3 A schematic diagram of a battery module provided by an embodiment of the present application from another perspective.

[0031] Figure 4 A disassembly schematic diagram of a battery module provided by an embodiment of the present application.

[0032] Figure 5 A structure schematic diagram of an end plate in a battery module provided by an embodiment of the present application.

[0033] Figure 6 A structure schematic diagram of an end plate in a battery module provided by an embodiment of the present application from another perspective.

[0034] Legend of the drawings: 10, cell group; 20, binding belt; 200, end plate main body; 201, first large surface; 202, second large surface; 203, second groove; 204, limiting boss; 205, first reinforcing rib; 206, second reinforcing rib; 207, second through hole; 210, first connecting surface; 211, first groove; 212, first through hole; 220, second connecting surface; 230, first transition surface; 231, third groove; 240, second transition surface. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," "having" and "with" and variations thereof in the specification and claims herein is intended to be open, and mean that there are equivalents.

[0037] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will understand that an embodiment described herein can be combined with another embodiment.

[0038] The term "and / or", merely used as a description of associated objects, means that there are three kinds of relationships, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0039] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a specific order, and can explicitly or implicitly include one or more of the features.

[0041] In the description of the present application, the meaning of "a plurality of" is two or more (including two), and the meaning of "a plurality of groups" is two or more groups (including two groups).

[0042] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of mechanical structure can mean physical connection, such as fixed connection, for example, fixed connection by spacer, such as fixed connection by screw, bolt or other spacer; the physical connection can also be detachable connection, such as mutual clamping or clamping connection; the physical connection can also be integrally connected, such as welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] As known from the background art, the mass of the current battery module is large and the energy density is low.

[0044] The end plate structure in the related art is not reasonable enough, and in order to meet the requirement of firmness, the end plate is usually designed to be thicker. This results in a larger volume and weight of the entire battery pack, so there is still room for optimization of the structure of the end plate. Figure 1 The end plate structure in the prior art is shown in the figure. Please refer to Figure 1 In the prior art, the side surface of the end plate is smooth and rounded, which not only occupies a certain volume of the end plate, but also occupies some space of the battery pack.

[0045] Therefore, the present application provides a battery module or an end plate of a battery module, wherein the end plate main body structure of the end plate is further optimized, so that the end plate main body has a first connecting surface on two side surfaces, and the first connecting surface is a slope. Compared with the outwardly protruding slope in the prior art, the overall volume of the end plate main body can be reduced, and the weight can also be reduced. This not only helps to improve the space utilization rate of the battery module, but also provides more space for the installation and layout of other components, so that the structure of the entire battery module is more compact and reasonable, and the energy density of the battery pack is improved. Further, a first groove is provided on the first connecting surface, so that the amount of material of the end plate is reduced, thereby effectively reducing the weight of the end plate, and the design of the first groove provides more space for the installation and layout of other components, so that the structure of the entire battery module is more compact and reasonable, thereby greatly improving the energy density of the battery pack.

[0046] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings.

[0047] Figure 2 The battery module schematic diagram provided for the embodiment. Figure 3 The battery module schematic diagram provided for the embodiment. Figure 4 The battery module schematic diagram provided for the embodiment. Please refer to Figure 2 、 Figure 3 and Figure 4 The battery module has a battery cell group 10, and an end plate is arranged at both ends of the battery cell group 10. The battery cell group 10 is composed of a plurality of battery cells arranged side by side. The end plate is arranged at both ends of the battery cell group 10.

[0048] Figure 5 The structure schematic diagram of the end plate provided in the embodiment. Please refer to Figure 5 The end plate of the battery module provided in the embodiment includes an end plate body 200, the end plate body 200 has a first large face 201 and a second large face 202 and a side face located on both sides of the first large face 201 and the second large face 202, the shapes of the first large face 201 and the second large face 202 are the same, and the area of the first large face 201 is larger than the area of the second large face 202, the first large face 201 is close to the battery cell group 10, and the second large face 202 is away from the battery cell group 10, and the two sides of the two side faces are connected with the first large face 201 and the second large face 202 respectively. The side face includes a first connecting face 210 and a second connecting face 220 connected with the first connecting face 210, and a plurality of first grooves 211 are further arranged on the first connecting face 210.

[0049] The first large face 201 and the second large face 202 are the faces of the end plate body 200 respectively facing and away from the resistance group. The shapes of the first large face 201 and the second large face 202 in the embodiment are the same, but the area of the first large face 201 is larger than the area of the second large face 202. This makes the two side faces of the end plate body 200 at least partially be inclined faces, and the design of the inclined faces can reduce the volume and weight of the end plate body 200. This not only helps to improve the space utilization rate of the battery module, but also provides more space for the installation and layout of other components, so that the structure of the whole battery module is more compact and reasonable, and the energy density of the battery pack is improved.

[0050] The side face not only includes the first connecting face 210, but also includes the second connecting face 220 connected with the first connecting face 210, which can ensure the firmness of the whole end plate, and the second connecting face 220 part can also be used as the basis for installing and fixing other components such as heat dissipation side cold plates, fixing supports, etc., so as to further optimize the internal space layout of the battery module and improve the space utilization rate. The design of the first connecting face 210 can also increase the surface area of the end plate, thereby improving the heat dissipation performance of the end plate, which helps to keep the temperature of the battery module within a reasonable range and prolong the service life of the battery.

[0051] Further, the first recess 211 is arranged on the first connecting surface 210, so that the material usage of the end plate is reduced, thereby effectively reducing the weight of the end plate, and the design of the first recess 211 provides more space for the installation and layout of other components, so that the structure of the entire battery module is more compact and reasonable, thereby greatly improving the energy density of the battery pack.

[0052] In the embodiment, the two side surfaces can be symmetrical.

[0053] In the embodiment, the side surface includes a first connecting surface 210 and a second connecting surface 220, wherein the first connecting surface 210 is a beveled surface, and the second connecting surface 220 is a flat surface. The second connecting surface 220 is a flat surface, which serves to ensure the overall firmness of the end plate. The second connecting surface 220 can also serve as a basis for mounting and fixing other components, such as heat dissipation side cold plates, fixing brackets, etc., thereby further optimizing the internal space layout of the battery module and improving the space utilization rate.

[0054] The design of the first connecting surface 210 as a beveled surface can also increase the surface area of the end plate, thereby improving the heat dissipation performance of the end plate, which helps to keep the temperature of the battery module within a reasonable range and prolong the service life of the battery.

[0055] Please continue to refer to Figure 5 , the side surface further includes a first transition surface 230 and a second transition surface 240, the first transition surface 230 is connected between the second large surface 202 and the first connecting surface 210, and the second transition surface 240 is connected between the first connecting surface 210 and the second connecting surface 220, and the first transition surface 230 and the second transition surface 240 are curved surfaces.

[0056] Through the above scheme, in the design of the side surface of the end plate, the first transition surface 230 and the second transition surface 240 are curved surfaces, which are respectively connected between the second large surface 202 and the first connecting surface 210, and between the first connecting surface 210 and the second connecting surface 220. This design helps to disperse the stress of the end plate on the binding belt 20. The curved transition makes the stress distribution more uniform in the contact area between the end plate and the binding belt 20, avoiding stress concentration. When the binding belt 20 exerts pressure on the end plate, the curved surface can guide the stress to be smoothly transmitted and dispersed along its arc shape to a larger area, thereby reducing the local stress peak and reducing the risk of damage caused by stress concentration. Uniformly distributed stress helps to enhance the connection stability between the end plate and the binding belt 20, and the fixing effect of the binding belt 20 on the battery cell group 10 is more reliable, which can better resist external forces such as vibration and impact that may occur during transportation or use, ensuring the stability and safety of the battery cell group 10.

[0057] In this embodiment, a third groove 231 is arranged on the second transition surface 240. By arranging the groove on the second transition surface 240, the material usage of the end plate is reduced, thereby further reducing the overall weight of the end plate.

[0058] The third groove 231 can be arranged at a position corresponding to a position where the binding belt 20 is not required, so that the firmness of the binding belt 20 is not affected.

[0059] Please continue to refer to Figure 5 , the first through hole 212 is arranged on the first connecting surface 210 on both sides of the end plate body 200 and is communicated to the third groove 231.

[0060] Through the above scheme, by arranging the first through hole 212 on the first connecting surface 210 and communicating to the third groove 231, the space avoided by the first connecting surface 210 is fully utilized, so that the cable tie can be arranged in the first through hole 212 without occupying additional space. The transition space between the first connecting surface 210 and the second connecting surface 220 of the end plate is utilized, and additional holes or fixing structures are avoided in other parts of the end plate body 200. In this way, the integrity and compactness of the end plate body 200 can be maintained, and more space is provided for the installation and layout of the battery cell group 10 and other components, thereby improving the overall space utilization of the battery module. Arranging the first through hole 212 on the first connecting surface 210 makes the fixing position of the cable tie more coordinated with the structural layout of the end plate. This layout not only facilitates the installation and fixation of the cable tie, but also better disperses and transmits the pressure and stress from the cable tie, avoiding adverse effects on the structure of the end plate body 200 and ensuring the structural stability and reliability of the battery module. Since the first through hole 212 is communicated with the third groove 231, the cable tie can conveniently pass through the first through hole 212 and be fixed in the third groove 231, hiding the cable tie in the first through hole 212 or the third groove 231, so that the appearance of the end plate is more neat and beautiful. The cable tie can be used to provide uniform binding force, making the connection between the end plate and other components more tight and stable. This stable connection helps to resist vibrations and impacts that may occur during transportation or use, ensuring the long-term reliability of the battery module. Since the cable tie has a small volume, its arrangement in the first through hole 212 does not occupy too much space, making the design of the end plate more compact. This also helps to improve the space utilization of the battery module, providing more space for the installation and layout of other components.

[0061] In this embodiment, a first groove 211 is also arranged on the first connecting surface 210, so that the material usage of the end plate is reduced, thereby effectively reducing the weight of the end plate, and the design of the first groove 211 provides more space for the installation and layout of other components, making the structure of the entire battery module more compact and reasonable, thereby greatly improving the energy density of the battery pack.

[0062] In some embodiments, the thickness of the end plate body 200 is the straight-line distance from the first major surface 201 to the second major surface 202, and the width of the second connecting surface 220 is greater than one-half of the thickness of the end plate body 200.

[0063] The width of the second connecting surface 220 being greater than one-half of the thickness of the end plate body 200 means that the second connecting surface 220 has a larger area and can better withstand the pressure and impact force from the battery cell group 10. This design makes the end plate have stronger compression resistance in the vertical direction, preventing the end plate from bending or deforming, thereby improving the structural strength and stability of the end plate. At the same time, the wider second connecting surface 220 helps to disperse and transfer the pressure of the battery cell group 10, so that these forces are more evenly distributed in the main body part of the end plate, further enhancing the load-bearing capacity of the end plate. The reasonable proportion and combination of the second connecting surface 220 and the first connecting surface 210 make the end plate reduce in volume and weight while ensuring its stability and firmness.

[0064] In some embodiments, the second major surface 202 is provided with a second groove 203, and the first reinforcing rib 205 and the second reinforcing rib 206 are arranged in the second groove 203, and the first reinforcing rib 205 and the second reinforcing rib 206 are arranged alternately. By arranging the second groove 203 on the second major surface 202, the amount of material of the end plate is reduced, thereby effectively reducing the weight of the end plate.

[0065] The reinforcing rib design in the second groove 203 can effectively enhance the local stiffness and anti-deformation ability of the end plate. The alternately arranged first reinforcing rib 205 and second reinforcing rib 206 form a stable support structure, so that the end plate can better disperse and absorb external pressure or impact when subjected to external pressure or impact, preventing the end plate from bending or breaking, thereby significantly improving the structural strength of the end plate.

[0066] The design of the second groove 203 increases the surface area of the end plate, improves the contact area of the end plate with air, and thereby enhances the heat dissipation performance of the end plate. The presence of the first reinforcing rib 205 and the second reinforcing rib 206 can also promote heat conduction and dissipation, so that heat can be more effectively transferred from the end plate to the surrounding environment, helping to keep the temperature of the battery module within a reasonable range and prolong the service life of the battery. The staggered layout of the first reinforcing rib 205 and the second reinforcing rib 206 can also form certain air flow channels, promoting air flow and further improving heat dissipation efficiency.

[0067] In some embodiments, the shape of the second groove 203 can be square, hexagonal, or octagonal. It can be a shape that can facilitate the arrangement of reinforcing ribs therein to ensure the structural strength of the end plate body 200.

[0068] In some embodiments, the first reinforcing rib 205 and the second reinforcing rib 206 are perpendicular to each other, and the thickness of the first reinforcing rib 205 and the second reinforcing rib 206 is greater than or equal to 1 mm.

[0069] Through the above scheme, the first reinforcing rib 205 and the second reinforcing rib 206 are perpendicular to each other, which can change the stress distribution of the end plate, so that the stress is more evenly distributed in each part of the end plate, avoiding the occurrence of stress concentration phenomenon. This optimized stress distribution helps to improve the fatigue life of the end plate and reduce the risk of cracks and damage caused by stress concentration. The thickness of the first reinforcing rib 205 and the second reinforcing rib 206 is greater than or equal to 1 mm, which ensures that it has sufficient rigidity and strength. Such thickness can effectively resist bending and deformation, so that the reinforcing rib can remain stable when bearing a larger load, further enhancing the overall structural strength of the end plate.

[0070] Please refer to Figure 5 In some embodiments, a limiting boss 204 is provided on the end plate body 200, the limiting boss 204 protrudes from the second large surface 202, and the limiting boss 204 is correspondingly provided on both sides of the binding belt 20.

[0071] Through the above scheme, the limiting boss 204 can effectively limit the position of the binding belt 20 on the end plate, preventing the binding belt 20 from moving horizontally or vertically when subjected to external force. This limiting effect ensures that the binding belt 20 can always be fastened on the end plate, improving the fixing stability of the battery module, preventing the battery cell group 10 from loosening or shifting during transportation or use. The presence of the limiting boss 204 provides a clear positioning reference for the installation of the binding belt 20, so that the assembler can quickly and accurately place the binding belt 20 in the correct position. Since the limiting boss 204 can accurately limit the position of the binding belt 20, the installation position error of the binding belt 20 can be effectively controlled during assembly. This helps to improve the assembly quality of the battery module and ensures the consistency and stability of its structure. The setting of the limiting boss 204 can ensure that the installation position and method of the binding belt 20 in different battery modules remain consistent, enhancing the standardization of the product.

[0072] Figure 6 This is a top view of the end plate structure provided in the present embodiment. Please refer to Figure 5 and Figure 6 A second through hole 207 is provided in the end plate body 200, and the second through hole 207 penetrates the upper top surface and the lower top surface of the end plate body 200.

[0073] The second through hole 207 provides flexible positioning and adjustment space for the installation of long screws. Assemblers can select the appropriate screw length and installation position according to actual needs to accommodate battery modules of different sizes and structures. When the battery module needs to be hoisted, transported, or installed, the second through hole 207 can also serve as a hoisting hole, allowing the battery module to be lifted as a whole using hoisting equipment. This design simplifies the hoisting process, reduces reliance on other hoisting tools, and improves hoisting efficiency and safety. At the same time, it also makes the handling and installation of the battery module more convenient, reducing labor intensity and costs. The design of the second through hole 207 makes full use of the internal space of the end plate body 200, avoiding the need for additional fixing or hoisting structures on the end plate surface. This keeps the end plate surface clean and aesthetically pleasing, while also providing more space for the installation and layout of other components, improving the overall space utilization of the battery module.

[0074] Based on the above embodiments, this embodiment also provides a battery module, including a cell group 10 and any of the above-mentioned end plates, with the end plates disposed at both ends of the cell group 10.

[0075] Since the structure and beneficial effects of the battery module's end plate have been described in detail in the previous embodiments, they will not be repeated here.

[0076] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An end plate for a battery module, the end plate being disposed at both ends of a battery cell assembly, characterized in that, The device includes an end plate body, which has a first large surface and a second large surface, as well as side surfaces located on both sides of the first large surface and the second large surface. The first large surface and the second large surface have the same shape, and the area of ​​the first large surface is larger than that of the second large surface. The first large surface is close to the battery cell assembly, and the second large surface is far away from the battery cell assembly. The two side surfaces are respectively connected to the first large surface and the second large surface. The side surface includes a first connecting surface and a second connecting surface connected to the first connecting surface, wherein the first connecting surface is an inclined surface and the second connecting surface is a plane. The first connecting surface is provided with a plurality of first grooves.

2. The end plate according to claim 1, characterized in that, The thickness of the end plate body is the straight-line distance from the first large surface to the second large surface, and the width of the second connecting surface is greater than half the thickness of the end plate body.

3. The end plate according to claim 1, characterized in that, The second large surface is provided with a second groove, and the second groove is provided with a first reinforcing rib and a second reinforcing rib, which are arranged alternately.

4. The end plate according to claim 3, characterized in that, The first reinforcing rib and the second reinforcing rib are perpendicular to each other, and the thickness of the first reinforcing rib and the second reinforcing rib is greater than or equal to 1 mm.

5. The end plate according to claim 4, characterized in that, The end plate body is provided with a limiting boss, which protrudes from the second large surface and is correspondingly provided on both sides of the strap.

6. The end plate according to claim 1, characterized in that, The side surface also includes a first transition surface and a second transition surface. The first transition surface connects the second large surface and the first connecting surface, and the second transition surface connects the first connecting surface and the second connecting surface. The first transition surface and the second transition surface are curved surfaces.

7. The end plate according to claim 6, characterized in that, A third groove is provided on the second transition surface.

8. The end plate according to claim 7, characterized in that, A first through hole is provided, which is located on the first connecting surface on both sides of the end plate body and communicates with the third groove.

9. The end plate according to claim 8, characterized in that, The end plate body is provided with a second through hole, which penetrates the upper and lower top surfaces of the end plate body.

10. A battery module, characterized in that, It includes a battery cell assembly and an end plate as described in any one of claims 1 to 9, wherein the end plate is disposed at both ends of the battery cell assembly.

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