WO2019128641A1

WO2019128641A1 - Composite end plate and battery module

Info

Publication number: WO2019128641A1
Application number: PCT/CN2018/119128
Authority: WO
Inventors: 游书兵
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2017-12-29
Filing date: 2018-12-04
Publication date: 2019-07-04
Also published as: CN109994696A; CN109994696B

Abstract

A composite end plate (1) and a battery module, the composite end plate (1) comprising: an end plate main body (11), having a first surface (11a) and a second surface (11b) which are opposite to each other in a thickness direction thereof, the first surface (11a) being disposed facing a battery cell (2) of the battery module; and a composite adapter (12) arranged on the end plate main body (11), the composite adapter (12) comprising a first plate (120) and a second plate (121) which are mutually laminated and made of different materials, wherein the composite adapter (12) is connected and fixed to the end plate main body (11) by means of the first plate (120), while the second plate (121) is located on the second surface (11b) and may be connected and fixed to an external structural member. When the composite end plate (1) is applied to the battery module, the composite end plate (1) may be securely connected to a side plate (3), so as to effectively offset an expansion deformation force of the battery cell (2), prevent increase in overall size of the battery module, and improve safety and reliability of using the battery module.

Description

Composite end plate and battery module

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

Technical field

The present application relates to the field of battery technologies, and in particular, to a composite end plate and a battery module.

Background technique

With the development of technology, power battery applications are becoming more and more extensive, involving production or life. The power battery is also called a secondary battery and is a rechargeable battery. Power batteries are widely used. Low-capacity power batteries can be used in small electric vehicles, and high-capacity power batteries can be used in large electric vehicles such as hybrid or electric vehicles. When power batteries are used in groups, it is necessary to use a bus bar to connect each power battery in series or in parallel. Usually, the bus bar is soldered to the positive and negative terminals of the power battery. Each power battery includes a plurality of battery modules. Each battery module includes a plurality of unit cells and end plates and side plates for fixing a plurality of unit cells. The end plates and side plates are placed around all of the cells. In the prior art, the end plate is a unitary structure. The end plate and the side plate are fixedly mounted by welding. As the capacity of the battery module continues to increase, the single battery will expand itself in some cases, thereby applying an expansion force to the end plate and the side plate, which causes the end plate and the side plate to be easily deformed and displaced, thereby causing the side. The weld between the plate and the end plate fails. Therefore, the conventional battery module has a problem of low structural strength.

Summary of the invention

The embodiment of the present application provides a composite end plate and a battery module. When the composite end plate is applied to the battery module, it can be firmly connected with the side plate, effectively counteracting the expansion deformation force of the single battery, preventing the overall size of the battery module from becoming large, and improving the safe and reliable use of the battery module.

In one aspect, the embodiment of the present application provides a composite end plate for a battery module, comprising: an end plate body having a first surface and a second surface opposite to each other in a thickness direction thereof, the first surface facing the battery module The unitary battery arrangement; the composite adapter is disposed on the end plate body, and the composite adapter comprises a first plate member and a second plate member which are stacked on each other, and the first plate member and the second plate member are made of different materials. The composite adapter is fixedly connected to the end plate main body through the first plate member, and the second plate member is located on the second surface and can be fixedly coupled to the outer structural member.

A composite end plate according to an embodiment of the present application includes an end plate body and a composite adapter. The composite adapter includes a first panel fixedly coupled to the end panel body and a second panel laminated to the first panel. The second plate is for attachment to the outer structural member. The composite adapter implements the transfer of the end plate body and the outer structural member. When the composite end plate is applied to the battery module, the side plate can be connected and fixed by the second plate member of the composite adapter, which is beneficial to selecting the side plate and the second plate member of different materials according to the actual application requirements, and the end plate main body is The material can also be flexibly selected, so that the overall weight reduction of the composite end plate can be realized, thereby achieving the overall weight reduction of the battery module. The composite adapter and the side panels can be made of the same material and can be joined to each other by soldering. In this way, the composite adapter and the side plates can be connected and fixed by welding, and the welded seam formed by the two has high strength and strong tensile strength, so that the composite end plate can withstand larger expansion deformation force of the single battery and improve the battery. The structural reliability of the module as a whole.

In another aspect, a battery module according to an embodiment of the present application includes: a plurality of single cells, a plurality of single cells are arranged side by side; a fixing frame is sleeved on the outer circumference of all the single cells, and the fixed frame includes two The composite end plate and the two side plates are as described above, and the composite end plate and the side plate are alternately arranged around the plurality of single cells, and the side plates and the second plate are made of the same material and are fixedly connected to the second plate.

DRAWINGS

Features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

1 is a schematic view showing the overall structure of a battery module according to an embodiment of the present application;

2 is a schematic exploded view of a composite end plate according to an embodiment of the present application;

3 is a schematic view showing the overall structure of a composite end plate according to an embodiment of the present application;

Figure 4 is a partial enlarged view of A in Figure 3;

5 is a schematic overall structural view of a composite end plate according to another embodiment of the present application;

6 is a partial structural schematic view of an end plate main body according to another embodiment of the present application;

FIG. 7 is a schematic structural view of a composite adapter 12 according to an embodiment of the present application.

In the drawings, the drawings are not drawn to scale.

Marking instructions:

1. Composite end plate;

11. The end plate body; 11a, the first surface; 11b, the second surface; 110, the central axis; 111, the first connecting end; 112, the intermediate transition portion; 113, the second connecting end; 114, the mounting hole; Through hole; 116, positioning groove; 116a, first groove body; 116b, second groove body; X, width direction; Y, thickness direction; Z, height direction;

12, a composite adapter; 120, a first plate; 120a, a limiting portion; 120b, a body portion; 121, a second plate;

2, single battery;

3, side panels.

Detailed ways

The embodiments of the present application are further described in detail below with reference to the accompanying drawings and embodiments. The detailed description of the embodiments and the accompanying drawings are intended to illustrate the principles of the present application, but are not intended to limit the scope of the application.

In the description of the present application, it should be noted that, unless otherwise stated, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inside" The orientation or positional relationship of the indications, "outside" and the like is merely for the convenience of the description of the present application and the simplified description, and is not intended to indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot It is understood to be a limitation on the present application. Moreover, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, a fixed connection or a Disassemble the connections, or connect them integrally; they can be connected directly or indirectly via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood as the case may be.

For a better understanding of the present application, a composite end plate 1 according to an embodiment of the present application will be described in detail below with reference to FIGS. 1 through 7.

Fig. 1 schematically shows the overall structure of a battery module of an embodiment. Fig. 2 schematically shows the exploded structure of the composite end plate 1 of an embodiment. Fig. 3 schematically shows the overall structure of a composite end plate 1 of an embodiment. Figure 4 is a partial enlarged view of a portion A in Figure 3. Fig. 5 schematically shows the overall structure of a composite end plate 1 of another embodiment. Fig. 6 schematically shows a partial structure of an end plate main body 11 of another embodiment. Fig. 7 schematically shows the structure of a composite adapter 12 of an embodiment.

As shown in FIG. 1, the composite end plate 1 of the embodiment of the present application is used for a battery module. The battery module of this embodiment includes a plurality of single cells 2 arranged in one direction, two composite end plates 1 of the present embodiment, and two side plates 3. A plurality of unit cells 2 form an assembly. The two composite end plates 1 are respectively disposed on opposite sides of the assembly along the arrangement direction of the unit cells 2. The two side plates 3 are respectively disposed at intervals in a direction perpendicular to the direction in which the unit cells 2 are arranged, and are respectively connected to the two composite end plates 1. The two composite end plates 1 and the two side plates 3 together form a fixed frame for fixing a plurality of unit cells 2. A plurality of holes may be provided in the side plate 3 to reduce the weight thereof and to facilitate the heat dissipation of the unit cells 2.

As shown in FIG. 2 and FIG. 3, the composite end plate 1 of the embodiment of the present application includes an end plate main body 11. The end plate main body 11 of the present embodiment has a predetermined width, thickness, and height, and the size can be flexibly selected according to actual needs. The end plate main body 11 has a first surface 11a and a second surface 11b which are opposed in the thickness direction Y of the self. When the composite end plate 1 is used in a battery module, the first surface 11a of the end plate main body 11 can be disposed facing the unit cell 2, and generally the first surface 11a is flat to be attached to the entire surface of the unit cell 2 of the square structure. In order to avoid squeezing the housing of the unit cell 2. The second surface 11b of the end plate main body 11 faces away from the unit cell 2 toward the external environment.

The end plate main body 11 of the present embodiment includes a first connection end 111, an intermediate transition portion 112, and a second connection end 113 which are successively distributed in the width direction X. After the unit cell 2, the composite end plate 1 and the side plate 3 are assembled into a battery module, the battery module is integrally connected to the outer structural member through the first connection end 111 and the second connection end 113 on the end plate main body 11. For example, the outer structural member may be a battery case for accommodating the battery module. In one embodiment, the first connecting end 111 and the second connecting end 113 of the end plate main body 11 each have a screw mounting hole 114 extending in the height direction, and the end plate main body 11 is easily attached and fixed to the outer structural member using screws.

The end plate main body 11 of the present embodiment includes a plurality of through holes 115 extending in the height direction Z provided on the intermediate transition portion 112. The end plate main body 11 includes a top and a bottom opposite in the height direction Z. Each of the through holes 115 penetrates the top and bottom of the end plate main body 11. On the one hand, the end plate main body 11 having the through hole 115 is light in weight, which is advantageous for improving the overall weight reduction of the battery module; on the other hand, the end plate main body 11 having the through hole 115 has a good rigidity and enhances its own resistance to deformation. The through hole 115 of the end plate main body 11 can serve as a heat dissipating passage, and can assist the heat dissipation of the unit cell 2 adjacent to the end plate main body 11 to reduce the single unit. The temperature of the battery 2. Alternatively, the cross-sectional shape of the through hole 115 is a circle, a rectangle, or a triangle.

The composite end plate 1 of the embodiment of the present application includes a composite adapter 12 that is fixedly coupled to the end plate main body 11. The composite adapter 12 of the present embodiment extends in the height direction Z of the end plate main body 11. The composite adapter 12 includes a first panel 120 and a second panel 121 that is stacked with the first panel 120. The composite adapter 12 is connected and fixed by the first plate member 120 and the end plate main body 11. The surface of the second plate member 121 facing away from the first surface 11a of the end plate main body 11 is exposed to the external environment and is used for connection with the side plate 3. The first plate member 120 and the second plate member 121 are different in material. Optionally, the first plate member 120 and the second plate member 121 are made of a metal material, or the first plate member 120 is made of a non-metal material, and the second plate member 121 is made of a metal material. The materials of the first plate member 120 and the end plate main body 11 may be the same or different. The second plate member 121 is made of the same material as the side plate 3. The ends of the two side plates 3 can be folded over to the side of the second surface 11b of the end plate main body 11 and connected to the second plate member 121.

When the composite end plate 1 of the embodiment of the present application is applied to a battery module, the first surface 11a of the end plate main body 11 of the present embodiment is disposed adjacent to the unit cell 2, and the second plate member 121 of the composite adapter 12 is used. It is connected and fixed to the side plate 3.

In one embodiment, as shown in FIG. 5, the number of composite adapters 12 disposed on the end plate body 11 is one. The two side plates 3 are respectively fixedly coupled to the second plate member 121 of the composite adapter 12. The two side panels 3 are capable of simultaneously tensioning the composite adapter 12 and transmitting the tensioning force to the unit cells 2 through the composite adapter 12 to counteract the expansion deformation force of the unit cells 2. The composite adapter 12 of the present embodiment is disposed at an intermediate position of the end plate main body 11, and when the two side plates 3 simultaneously apply a force to the composite end plate 1, the overall force balance of the composite end plate 1 is ensured.

In one embodiment, as shown in connection with Figures 3 and 4, the number of composite adapters 12 disposed on the end plate body 11 is two. The two composite adapters 12 are spaced apart in the width direction X of the end plate main body 11. One side panel 3 is fixedly coupled to the second panel member 121 of one of the composite adapter members 12, and the other side panel 3 is coupled to the second panel member 121 of the other composite adapter member 12.

When the number of the composite adapters 12 disposed on the end plate main body 11 of the embodiment is two, one composite adapter 12 is disposed on the first connection end 111 of the end plate main body 11, and the other composite adapter 12 is provided. The second connecting end 113 is disposed on the end plate main body 11. The two composite adapters 12 are symmetrically disposed relative to the central axis 110 of the end plate body 11. The central axis 110 extends in the height direction Z of the end plate body 11. When the two composite adapters 12 are respectively subjected to the force of the side plate 3, the composite end plate 1 as a whole can be in an equilibrium state, and the rotational moment generated by the first connection end 111 of the end plate main body 11 after the composite end plate 1 is stressed is avoided. It is larger than the rotational moment generated at the second connecting end 113, so that the composite end plate 1 integrally rotates around the central axis 110 of the end plate main body 11, improving the overall positional stability of the composite end plate 1.

Optionally, the side plate 3 and the second plate member 121 of the composite adapter 12 are made of steel, so that the two can be connected and fixed by welding, and the connection mode is simple and easy to operate. The side plates 3 of the steel material and the second plate members 121 of the composite adapter 12 are welded to each other to form a welded portion having a high joint strength. Thus, the weld strength of the side plate 3 and the second plate member 121 of the composite adapter 12 is large, and the tensile strength of the weld is increased, so that the composite end plate 1 can withstand a larger expansion force of the unit cell 2, thereby avoiding The expansion deformation force generated when the unit cell 2 is expanded and deformed easily pulls the welded portion apart, improves the structural reliability of the entire battery module, and prevents the outer shape of the battery module from being changed by the expansion deformation of the unit cell 2 . It can be understood that the side plate 3 and the second plate member 121 of the composite adapter 12 can also be the same metal material that meets the connection strength requirements.

When the composite end plate 1 of the embodiment of the present application is applied to a battery module, the first surface 11a of the end plate main body 11 of the present embodiment is disposed adjacent to the unit cell 2, and the second plate member 121 of the composite adapter 12 is used. It is connected and fixed to the side plate 3. The two side plates 3 are capable of transmitting the tension to the unit cells 2 through the composite adapter 12 and the end plate main body 11 to offset the expansion deformation force of the unit cells 2.

In the embodiment of the present application, since the composite end plate 1 is connected to the side plate 3 through the second plate member 121 of the composite adapter 12, the material of the end plate main body 11 is more flexible. The material of the end plate main body 11 may be a material having a lower density, provided that the connection rigidity between the side plate 3 of the same metal material and the second plate member 121 of the composite adapter 12 is satisfactory. Alternatively, the material of the end plate main body 11 may be engineering plastic, glass steel or carbon fiber, so that the overall weight of the composite end plate 1 can be reduced, and the weight of the battery module can be improved. The first plate member 120 of the composite adapter 12 can be fixedly coupled to the end plate body 11 by fasteners. The fastener can be a screw. Optionally, the material of the end plate main body 11 may also be aluminum or aluminum alloy, which is convenient for processing by extrusion molding and machining. The first plate member 120 and the end plate main body 11 can be connected and fixed by welding.

In one example, the second plate 121 and the side plates 3 of the composite adapter 12 are made of steel. When the side plate 3 of the battery module is made of steel, since the steel material itself has a large yield strength, when the expansion force of the unit cell 2 acts on the side plate 3, the stress generated on the side plate 3 is smaller than the yield strength of the steel material, thereby being effective. It is ensured that the side panel 3 does not undergo a large deformation. Thus, the battery module structure using the steel side plate 3 can effectively prevent the deformation of the battery module, thereby ensuring that the length of the battery module itself meets the design requirements. Preferably, the side plate 3 and the second plate member 121 of the composite adapter 12 are both stainless steel, and have high joint strength and good corrosion resistance.

In one embodiment, the first plate member 120 of the composite adapter 12 is made of aluminum, and the second plate member 121 is made of steel. The first plate member 120 and the second plate member 121 of the composite adapter 12 are compositely joined by a solid phase-solid phase composite method. The solid phase-solid phase composite method includes an explosion composite method or a rolling composite method, and the rolling composite method includes surface treatment of the first plate member 120 and the second plate member 121, a composite connection through a rolling mill, and diffusion annealing. . The first plate member 120 and the second plate member 121 after the composite connection have high connection strength, strong bearing capacity, and are not easily separated from each other by external force, thereby ensuring the first plate member 120 and the end plate main body 11 and the second plate member 121. The connection state with the side plate 3 is stable and firm.

The end plate main body 11 of the embodiment of the present application is provided with a positioning portion that extends in the height direction Z of the end plate main body 11. The composite adapter 12 also extends in the height direction Z of the end plate body 11. The composite adapter 12 is coupled to the positioning portion on the end plate body 11 by the first plate member 120. The first plate member 120 is matedly coupled to the positioning portion to position the composite adapter member 12 at a predetermined position on the end plate main body 11.

In one embodiment, the positioning portion is a ridge that protrudes from the second surface 11b. The first plate member 120 is provided with a groove matching the rib. The recess of the first plate member 120 is inserted into the rib to achieve positioning of the composite adapter 12 and the end plate body 11. Then, the first plate member 120 and the end plate main body 11 are joined and fixed by means of fasteners or welding.

In one embodiment, as shown in FIG. 2 and FIG. 6, the positioning portion is a positioning groove 116. The positioning groove 116 is recessed from the second surface 11b toward the first surface 11a. At least a portion of the first panel 120 sinks into the locating slot 116. After the first plate member 120 is embedded in the positioning groove 116, the first plate member 120 and the end plate main body 11 are connected and fixed by using fasteners or welding. Optionally, the shape and size of the first panel 120 match the shape and size of the positioning slot 116 to facilitate quick and accurate insertion of the first panel 120 into the positioning slot 116. Further, when the first plate member 120 and the end plate main body 11 are joined by welding, it is also convenient to perform a welding operation on the joint portion of the first plate member 120 and the end plate main body 11 using a welder.

The positioning groove 116 of the present embodiment includes a first groove body 116a and a second groove body 116b which are successively distributed in the height direction Z of the end plate main body 11, wherein the width of the first groove body 116a is larger than the width of the second groove body 116b. Thereby, a stepped surface is formed between the first tank body 116a and the second tank body 116b. As shown in FIG. 7, the first plate member 120 includes a limiting portion 120a that matches the first groove body 116a and a body portion 120b that matches the second groove body 116b. The first plate member 120 is engaged with the first groove body 116a of the end plate main body 11 through the limiting portion 120a to achieve accurate positioning, and the first plate member 120 is restrained by the limiting portion 120a after the positioning is completed, and is not easy to change itself. The position facilitates subsequent connection and fixing operations of the first plate member 120 and the end plate main body 11. After the limiting portion 120a of the first plate member 120 is engaged with the first groove body 116a, the limiting portion 120a is pressed against the stepped surface, and the body portion 120b is matched with the second groove body 116b.

Optionally, the end plate body 11 includes a top and a bottom that are opposite in their height direction Z. The first trough body 116a is adjacent to the top of the composite end plate 1 with respect to the second trough body 116b. When the composite adapter 12 is mounted in the upright state, the composite adapter 12 is entirely restricted by the limiting portion 120a disposed on the first panel 120, and the composite adapter 12 can be prevented from being subjected to gravity. The lower end of the end plate main body 11 is slid away from the predetermined mounting position, facilitating the joining operation of the composite adapter 12 and the end plate main body 11.

Optionally, the first groove body 116a and the second groove body 116b are perpendicular to each other, and the step surface formed is a plane, so that the positioning groove 116 has a T-shaped structure as a whole, and the structure is easy to manufacture and reduce the processing cost. Correspondingly, the limiting portion 120a and the body portion 120b are perpendicular to each other such that the first plate member 120 has a T-shaped structure as a whole.

Optionally, the second groove body 116b has an arc shape in cross section. The surface cross-sectional profile of the body portion 120b of the first plate member 120 for conforming to the second groove body 116b is also curved so that the body portion 120b can be closely fitted to the second groove body 116b. Since the contact area of the second groove body 116b and the body portion 120b of the first plate member 120 is curved, it is advantageous to disperse the stress after the second groove body 116b and the body portion 120b of the first plate member 120 are welded and connected, avoiding the first The positioning of both the two-slot body 116b and the body portion 120b of the first plate member 120 is inaccurate, resulting in stress concentration at the weld bead formed between the two, reducing the possibility of breakage of the weld bead, and improving the second groove body 116b. The connection stability to the body portion 120b of the first panel 120.

The first plate member 120 and the second plate member 121 of the embodiment of the present application have the same shape. The outlines of the first plate member 120 and the second plate member 121 are aligned in the stacking direction, which facilitates the overall fabrication of the composite adapter member 12. For example, after the first plate member 120 and the second plate member 121 are compositely joined, it is convenient to form the composite adapter member 12 of a suitable shape and size by one-time forming by stamping. The composite adapter 12 may be rectangular in shape as a whole, and correspondingly, the positioning groove 116 of the end plate main body 11 is an equal-width straight groove. The composite adapter 12 may be a T-shaped structure as a whole, and correspondingly, the positioning groove 116 of the end plate main body 11 is a T-shaped groove.

The surface of the second plate member 121 of the embodiment of the present application facing away from the first surface 11a of the end plate main body 11 is flush with the second surface 11b. In this way, the portion of the second plate member 121 protruding from the second surface 11b is prevented from lifting up the side plate 3, and the end portion of the side plate 3 is lifted up to affect the welding work with the second plate member 121, thereby facilitating the opposite side plate. The end of 3 is welded to the second plate 121. In addition, when the end portion of the side plate 3 is fixedly connected to the second plate member 121 of the composite adapter 12, the side plate 3 can be brought into contact with the second surface 11b of the end plate main body 11 to prevent the second plate member 121 from being sideways. The plate 3 is jacked up to cause a gap between the side plate 3 and the second surface 11b, thereby increasing the force receiving area of the side plate 3 and the composite end plate 1, so that the composite end plate 1 is more evenly stressed.

The composite end plate 1 of the embodiment of the present application includes an end plate main body 11 and a composite adapter 12. The composite adapter 12 includes a first plate member 120 that is fixedly coupled to the end plate main body 11 and a second plate member 121 that is laminated with the first plate member 120. The second plate member 121 is for fixing and fixing to an external structural member such as the side plate 3. The composite adapter 12 effects the transfer of the end plate body 11 and the outer structural member. The side plates 3 can be connected and fixed by the second plate member 121 of the composite adapter 12, which is advantageous for selecting the side plates and the second plate members 121 of different materials according to actual application requirements, and the material of the end plate main body 11 can also be flexibly selected. Therefore, the overall weight reduction of the composite end plate 1 can be achieved, thereby achieving overall weight reduction of the battery module. The composite adapter 12 and the side plates 3 may be of the same material and can be joined to each other by welding. In this way, the composite adapter 12 and the side plates 3 can be connected and fixed by welding, and the welds formed by the two have high strength and strong tensile strength, so that the composite end plate 1 can withstand larger expansion deformation of the single cells. Improve the structural reliability of the battery module as a whole.

The embodiment of the present application further provides a battery module including a plurality of unit batteries 2 and a fixing frame. A plurality of unit cells 2 are arranged side by side in one direction. The fixing frame is sleeved on the outer circumference of all the unit cells 2 to fix the plurality of unit cells 2. The fixed frame comprises two side panels 3 and two composite end panels 1 of the above-described embodiment. A plurality of unit cells 2 form an assembly. The composite body 1 is provided with a composite end plate 1 on opposite sides of the unit cell 2 in the direction in which they are arranged. The composite end plate 1 and the side plate 3 are alternately arranged in turn around all of the unit cells 2. The assembly is provided with a side plate 3 on each side perpendicular to the arrangement direction of the unit cells 2. The composite end plate 1 and the side plate 3 are alternately arranged in turn around all of the unit cells 2. The side plate 3 is made of the same material as the second plate member 121 of the composite adapter 12. Two composite end plates 1 disposed on both sides of the plurality of unit cells 2 are connected by the two side plates 3. Optionally, each of the side plates 3 has a U-shaped structure, and the two ends are folded to the side of the second surface 11b of the end plate main body 11 and are fixedly connected to the second plate member 121 of the composite adapter 12.

In one embodiment, the first panel 120 and the end panel body 11 of the composite adapter 12 are both aluminum. The material of the side plate 3 and the second plate member 121 of the composite adapter 12 is steel. Thus, the first plate member 120 of the composite adapter 12 and the end plate body 11 are welded together. The second plate member 121 and the side plate 3 of the composite adapter 12 are connected and fixed by welding. The first plate member 120 and the end plate main body 11 of the composite adapter 12, and the second plate member 121 and the side plate 3 of the composite adapter member 12 are welded to form a weld bead which is strong enough to withstand a larger single sheet. The expansion deformation force generated by the expansion of the body battery 2. The steel side plate 3 has a strong yielding ability and is not easily stressed or deformed, thereby effectively reducing the amount of movement or deformation of the composite end plate 1 in a direction away from the unit cell 2, and improving the overall reliability of the battery module. Sex. Preferably, the material of the side plate 3 and the second plate member 121 of the composite adapter 12 is stainless steel.

Although the present application has been described with reference to the preferred embodiments, various modifications may be made thereto and the components may be replaced with equivalents without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A composite end plate for a battery module, comprising:

The end plate body has a first surface and a second surface opposite to each other in a thickness direction thereof, the first surface facing the unit battery of the battery module;

a composite adapter is disposed on the end plate body, and the composite adapter includes a first plate member and a second plate member which are stacked on each other, and the first plate member and the second plate member are different in material. The composite adapter is fixedly connected to the end plate main body by the first plate member, and the second plate member is located on the second surface and can be fixedly connected with the outer structural member.
The composite end plate of claim 1 wherein:

The first plate member and the second plate member are both made of metal; or

The first plate member is made of a non-metal material, and the second plate member is made of a metal material.
The composite end plate according to claim 1, wherein the end plate main body is provided with a positioning portion extending in a height direction thereof, and the composite adapter extends in the height direction, the first plate member and the first plate member The positioning portions are coupled to be positioned at predetermined positions of the end plate body.
The composite end plate according to claim 3, wherein the positioning portion is a positioning groove, the positioning groove is recessed from the second surface toward the first surface, and at least a portion of the first plate is sunken. The positioning groove is inserted into the positioning groove and fixed to the end plate body.
The composite end plate according to claim 4, wherein the positioning groove comprises a first groove body and a second groove body successively distributed along the height direction, the width of the first groove body being larger than that of the second groove body Width, the first plate member includes a limiting portion matched with the first groove body and a body portion matching the second groove body, the first groove body and the second groove body being perpendicular to each other, Correspondingly, the limiting portion and the body portion are perpendicular to each other.
The composite end plate according to claim 1, wherein the first plate member and the end plate main body are made of the same metal material and are fixedly connected to each other by welding.
The composite end plate according to any one of claims 1 to 6, wherein the first plate and the second plate are identical in shape and aligned with each other in the stacking direction.
The composite end plate according to any one of claims 1 to 6, wherein the end plate main body includes a first connection end, an intermediate transition portion, and a second connection end which are successively distributed in the width direction thereof, the first The connecting end and the second connecting end are respectively provided with the composite adapter.
The composite end plate according to any one of claims 1 to 6, wherein a surface of the second plate facing away from the first surface is flush with the second surface.
A battery module, comprising:

a plurality of single cells, a plurality of the single cells being arranged side by side;

a fixing frame, disposed on an outer circumference of all of the unit cells, the fixing frame comprising two composite end plates according to any one of claims 1 to 9 and two side plates, the composite end plates and The side plates are alternately arranged around the plurality of the single cells, and the side plates are made of the same material as the second plate members and are fixedly connected to the second plate members.