Battery composite end plate

Abstract

The utility model belongs to the technical field of new energy batteries, and particularly relates to a battery composite end plate. The utility model provides a battery composite end plate which comprises a first plate body and a second plate body, and the second plate body is embedded in the first plate body; the first plate body comprises a first main body part and mounting parts located at the two ends of the first main body part, and the second plate body comprises a second main body part embedded in the first main body part and C-shaped parts located at the two ends of the second main body part; the C-shaped part comprises a welding plate exposed out of the side surface of the mounting part and can be used for being welded with a side plate of the battery module; the first plate body can be made of aluminum alloy materials, the second plate body can be made of stainless steel materials, on the basis that the heat dissipation capacity is met, the mechanical strength of the end plate can be further improved, and meanwhile the end plate and side plate steel can be fixed in a welding mode. And the safety performance and the service life of the battery module are improved.

Description

Technical Field

[0001] This utility model belongs to the field of new energy battery technology, and specifically relates to a battery composite end plate. Background Technology

[0002] The power battery of new energy vehicles consists of multiple battery modules. Each battery module includes multiple individual cells and end plates and side plates for fixing these cells. The end plates and side plates are fixed together by welding. The function of the end plates is to protect the battery module from external impacts or vibrations, preventing the individual cells from squeezing or being damaged. At the same time, the end plates must also dissipate the heat generated by the battery during operation to prevent performance degradation and safety issues. Therefore, the end plates require high mechanical strength and heat dissipation capabilities.

[0003] Currently, end plates in the industry are typically made of aluminum alloy using a die-casting process, which offers better heat dissipation than stainless steel; side plates are generally made of steel. End plates produced by die casting have the following disadvantages: 1. The mechanical properties of die-cast end plates are relatively low, requiring a T6 heat treatment process to improve their mechanical strength. However, due to the high temperature of T6 heat treatment, the end plates are prone to defects such as bubbles and deformation, affecting the product yield; 2. Due to the limitations of aluminum alloy, the mechanical strength improvement of die-cast end plates after T6 heat treatment is limited, making them unsuitable for vehicles operating in complex road conditions; 3. Due to the characteristics of welding processes, aluminum alloy end plates can only be fixed to other aluminum alloy materials through welding, and cannot be welded to high-strength materials such as steel. Therefore, it is necessary to design an end plate with high mechanical strength that is easy to weld to side plates. Utility Model Content

[0004] The purpose of this invention is to provide a composite end plate for batteries, so as to solve the technical problems of poor mechanical properties of aluminum alloy end plates and difficulty in welding them with steel side plates in the prior art.

[0005] This application provides a battery composite end plate, comprising: a first plate body and a second plate body, wherein the second plate body is fitted into the first plate body; wherein

[0006] The first plate includes a first main body and mounting portions located at both ends of the first main body;

[0007] The second plate includes a second main body portion fitted within the first main body portion, and C-shaped portions located at both ends of the second main body portion;

[0008] The C-shaped portion includes a positioning plate exposed on the side of the mounting portion facing the battery, a welding plate exposed on the side of the mounting portion, and a fixing plate fitted into the mounting portion.

[0009] The positioning plate is provided with several through holes, and the mounting part is provided with a protrusion for embedding into the corresponding through holes.

[0010] In one embodiment of this application, the second main body is provided with a plurality of first positioning holes for cooperating with mold pins;

[0011] The first main body is provided with a first clearance hole that corresponds one-to-one with the first positioning hole.

[0012] In one embodiment of this application, the fixing plate is provided with a plurality of second positioning holes for cooperating with mold pins;

[0013] The mounting part is provided with a second clearance hole that corresponds one-to-one with the second positioning hole.

[0014] In one embodiment of this application, the first plate is provided with a plurality of ejector pin clearance holes.

[0015] In one embodiment of this application, the first plate is provided with a plurality of weight-reducing holes.

[0016] In one embodiment of this application, the mounting portion is provided with mounting fixing holes.

[0017] In one embodiment of this application, the second main body includes: a first fitting plate located in the middle, and second fitting plates located at both ends of the first fitting plate;

[0018] The first fitting plate is located on a first plane, the second fitting plate is located on a second plane, and the positioning plate is located on a third plane; wherein...

[0019] The third plane is coplanar with the surface of the first plate facing the battery; both the first plane and the second plane are parallel to the third plane, with the first plane closer to the battery and the second plane farther away from the battery.

[0020] In one embodiment of this application, the first fitting plate is provided with a plurality of first hollow grooves;

[0021] The second fitting plate is provided with a plurality of second hollow slots; and

[0022] The perforation rate of the first interlocking plate is less than that of the second interlocking plate.

[0023] In one embodiment of this application, the first interlocking plate and the second interlocking plate are connected by a first bend;

[0024] The second fitting plate and the positioning plate are connected by a second bend.

[0025] In one embodiment of this application, the first plate is made of aluminum alloy and the second plate is made of stainless steel.

[0026] The beneficial effects of this utility model are:

[0027] Unlike existing technologies, this application provides a battery composite end plate, including a first plate and a second plate, with the second plate fitted into the first plate. The first plate includes a first main body and mounting portions at both ends of the first main body. The second plate includes a second main body fitted into the first main body and C-shaped portions at both ends of the second main body. The C-shaped portions include welding plates exposed on the sides of the mounting portions, which can be used for welding to the side plates of the battery module. The first plate can be made of aluminum alloy, and the second plate can be made of stainless steel. This design not only satisfies heat dissipation requirements but also further enhances the mechanical strength of the end plate, while allowing the end plate to be fixed to the side plate steel through welding. This improves the safety performance and service life of the battery module.

[0028] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a front perspective view of a battery composite end plate according to a preferred embodiment of the present invention;

[0032] Figure 2 This is a perspective view of the back of a battery composite end plate according to a preferred embodiment of the present invention;

[0033] Figure 3 This is an exploded view of a preferred embodiment of the battery composite end plate of this utility model;

[0034] Figure 4 This is a schematic diagram of the second plate body of a preferred embodiment of the present invention;

[0035] Figure 5 This is a cross-sectional view of a battery composite end plate according to a preferred embodiment of the present invention.

[0036] In the picture:

[0037] First plate 1, first main body 11, mounting part 12, protrusion 121, first clearance hole 101, second clearance hole 102, ejector pin clearance hole 103, weight reduction hole 104, fixing hole 105;

[0038] Second plate 2, second main body 21, first fitting plate 211, first hollow groove 2111, second fitting plate 212, second hollow groove 2121, first bending part 213, second bending part 214, C-shaped part 22, positioning plate 221, through hole 2211, welding plate 222, fixing plate 223, first positioning hole 201, second positioning hole 202;

[0039] First plane 100, second plane 200, third plane 300. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] Currently, end plates in the industry are typically made of aluminum alloy using a die-casting process, which offers better heat dissipation than stainless steel; side plates are generally made of steel. End plates produced by die casting have the following disadvantages: 1. The mechanical properties of die-cast end plates are relatively low, requiring a T6 heat treatment process to improve their mechanical strength. However, due to the high temperature of T6 heat treatment, the end plates are prone to defects such as bubbles and deformation, affecting the product yield; 2. Due to the limitations of aluminum alloy, the mechanical strength improvement of die-cast end plates after T6 heat treatment is limited, making them unsuitable for vehicles operating in complex road conditions; 3. Due to the characteristics of welding processes, aluminum alloy end plates can only be fixed to other aluminum alloy materials through welding, and cannot be welded to high-strength materials such as steel. Therefore, it is necessary to design an end plate with high mechanical strength that is easy to weld to side plates.

[0042] This application provides a battery composite end plate, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0043] See Figures 1 to 5In one embodiment, the battery composite end plate includes: a first plate body 1 and a second plate body 2, the second plate body 2 being fitted into the first plate body 1; wherein the first plate body 1 includes a first main body portion 11 and mounting portions 12 located at both ends of the first main body portion 11; the second plate body 2 includes a second main body portion 21 fitted into the first main body portion 11, and C-shaped portions 22 located at both ends of the second main body portion 21; the C-shaped portions 22 include a positioning plate 221 exposed on the side of the mounting portion 12 facing the battery, a welding plate 222 exposed on the side of the mounting portion 12, and a fixing plate 223 fitted into the mounting portion 12; the positioning plate 221 is provided with a plurality of through holes 2211, and the mounting portion 12 is provided with a protrusion 121 for embedding into the corresponding through holes 2211.

[0044] In one embodiment, the second plate 2 may be made of stainless steel; the first plate 1 may be made of aluminum alloy.

[0045] Optionally, in one process of preparing a battery composite end plate: a sheet metal part, namely the second plate 2, can be formed first by stamping and bending processes; a die-casting mold is designed and manufactured according to the die-casting process and product structure, and a positioning device for the second plate 2 is designed on the die-casting mold; the second plate 2 is fixedly installed in the die-casting mold, and molten aluminum is injected into the die-casting mold through a die-casting machine. The aluminum flows in the die-casting mold and wraps around the second plate 2 to form the first plate 1. The aluminum-steel composite battery end plate is formed by cooling.

[0046] In this embodiment, by fitting the first plate 1 and the second plate 2 together to form an aluminum-steel composite battery end plate, both the heat dissipation performance of the aluminum alloy and the overall mechanical strength can be improved. Furthermore, the C-shaped portion 22 includes a welding plate 222 exposed on the side of the mounting portion 12, which can be used for welding to the side plate of the battery module. This allows the end plate to be welded to steel components, avoiding the previous limitation that the front end plate could only be welded to aluminum parts, thus improving the safety performance and service life of the battery module.

[0047] Optionally, the second plate 2 may be made of stainless steel, with mechanical properties meeting the requirements of yield strength ≥ 420 MPa and tensile strength ≥ 780 MPa. The first plate 1 may be made of die-cast aluminum alloy AlSi10MnMg, with mechanical properties meeting the requirements of tensile strength ≥ 250 MPa, yield strength ≥ 120 MPa, and elongation after fracture ≥ 5%.

[0048] Furthermore, during die casting, molten aluminum flows into the through hole 2211 to form a protrusion 121. The cooperation between the through hole 2211 and the protrusion 121 can enhance the connection strength between the first plate 1 and the second plate 2, preventing them from separating.

[0049] In this embodiment, the overall strength of the mounting portion 12 can be improved by wrapping or fitting the mounting portion 12 with the C-shaped portion 22.

[0050] In this embodiment, when the second plate 2 is placed into the mold, it needs to be positioned. Optionally, the positioning plate 221 can directly contact the inner wall of the mold cavity for positioning. Further, the second main body 21 is provided with a plurality of first positioning holes 201 for cooperating with mold pins, and positioning can be achieved by inserting positioning pins into the corresponding first positioning holes 201; the first main body 11 is provided with first clearance holes 101 corresponding one-to-one with the first positioning holes 201.

[0051] Furthermore, since the fixing plate 223 is bent, in order to position it, the fixing plate 223 is provided with a plurality of second positioning holes 202 for cooperating with the mold pins; optionally, the mounting part 12 is provided with second clearance holes 102 corresponding one-to-one with the second positioning holes 202.

[0052] In this embodiment, the first clearance hole 101 and the second clearance hole 102 can be process holes formed by mold pins.

[0053] Furthermore, in order to fix the second plate 2 during the die casting process, it is necessary to press the ejector pin against the second plate 2. Therefore, a number of ejector pin clearance holes 103 will be formed on the first plate 1.

[0054] Optionally, in order to save materials, the first plate 1 is provided with a number of weight-reducing holes 104.

[0055] Furthermore, the mounting portion 12 is provided with mounting holes 105, which facilitates the installation of the end plate.

[0056] See Figures 3 to 5 Furthermore, the second main body 21 includes: a first fitting plate 211 located in the middle, and second fitting plates 212 located at both ends of the first fitting plate 211; the first fitting plate 211 is located on a first plane 100, and the second fitting plate 212 is located on a second plane 200; the positioning plate 221 is located on a third plane 300; wherein the third plane 300 is coplanar with the surface of the first plate 1 facing the battery; both the first plane 100 and the second plane 200 are parallel to the third plane 300, and the first plane 100 is closer to the battery, while the second plane 200 is farther away from the battery.

[0057] In this embodiment, by bending the second main body 21 located within the first main body 11 into a "U" shape, the length and structural complexity of the stainless steel sheet metal part within the aluminum alloy can be increased. This improves the integration of the second main body 21 within the first main body 11 during the die-casting process, thereby enhancing the overall mechanical strength of the end plate. The positioning plate 221 is coplanar with the surface of the first plate 1 facing the battery, facilitating the installation of the end plate and protecting the ends and corners of the end plate.

[0058] Optionally, the first fitting plate 211 and the second fitting plate 212 are connected by a first bending portion 213; the second fitting plate 212 and the positioning plate 221 are connected by a second bending portion 214.

[0059] Furthermore, the first interlocking plate 211 is provided with a plurality of first hollow grooves 2111; the second interlocking plate 212 is provided with a plurality of second hollow grooves 2121; and the hollowing ratio of the first interlocking plate 211 is less than that of the second interlocking plate 212.

[0060] In this embodiment, the hollowed-out groove serves two purposes: firstly, it reduces the amount of stainless steel material used, thus lowering the product's weight; secondly, during die casting, the aluminum alloy material passes through the hollowed-out groove, allowing the sheet metal and die-cast parts to be tightly connected, thereby improving the product's performance stability.

[0061] In summary, the aluminum-steel composite battery end plate of this invention not only meets heat dissipation requirements but also further enhances the mechanical strength of the end plate, while allowing it to be fixed to the steel material through welding. This improves the safety performance and service life of the battery module.

[0062] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0063] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0064] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.

Claims

1. A battery composite end plate, characterized in that, include: A first plate (1) and a second plate (2), wherein the second plate (2) is fitted inside the first plate (1); The first plate (1) includes a first main body (11) and mounting portions (12) located at both ends of the first main body (11); The second plate (2) includes a second main body (21) fitted into the first main body (11), and C-shaped portions (22) located at both ends of the second main body (21); The C-shaped portion (22) includes a positioning plate (221) exposed on the side of the mounting portion (12) facing the battery, a welding plate (222) exposed on the side of the mounting portion (12), and a fixing plate (223) fitted into the mounting portion (12); The positioning plate (221) is provided with a plurality of through holes (2211), and the mounting part (12) is provided with a protrusion (121) for embedding into the corresponding through hole (2211).

2. The battery composite end plate according to claim 1, characterized in that, The second main body (21) is provided with a plurality of first positioning holes (201) for cooperating with mold pins; The first main body (11) is provided with a first clearance hole (101) that corresponds one-to-one with the first positioning hole (201).

3. The battery composite end plate according to claim 1, characterized in that, The fixing plate (223) is provided with a plurality of second positioning holes (202) for cooperating with the mold pins; The mounting part (12) is provided with a second clearance hole (102) that corresponds one-to-one with the second positioning hole (202).

4. The battery composite end plate according to claim 1, characterized in that, The first plate (1) is provided with a plurality of ejector pin clearance holes (103).

5. The battery composite end plate according to claim 1, characterized in that, The first plate (1) is provided with a plurality of weight-reducing holes (104).

6. The battery composite end plate according to claim 1, characterized in that, The mounting part (12) is provided with mounting fixing holes (105).

7. The battery composite end plate according to claim 1, characterized in that, The second main body (21) includes: a first fitting plate (211) located in the middle, and second fitting plates (212) located at both ends of the first fitting plate (211); The first fitting plate (211) is located on the first plane (100), the second fitting plate (212) is located on the second plane (200); the positioning plate (221) is located on the third plane (300); wherein The third plane (300) is coplanar with the surface of the first plate (1) facing the battery; the first plane (100) and the second plane (200) are both parallel to the third plane (300), and the first plane (100) is closer to the battery, while the second plane (200) is farther away from the battery.

8. The battery composite end plate according to claim 7, characterized in that, The first interlocking plate (211) is provided with a plurality of first hollow grooves (2111); The second interlocking plate (212) is provided with a plurality of second hollow slots (2121); and The perforation rate of the first interlocking plate (211) is less than that of the second interlocking plate (212).

9. The battery composite end plate according to claim 7, characterized in that, The first fitting plate (211) and the second fitting plate (212) are connected by a first bend (213); The second fitting plate (212) is connected to the positioning plate (221) via a second bend (214).

10. The battery composite end plate according to claim 1, characterized in that, The first plate (1) is made of aluminum alloy, and the second plate (2) is made of stainless steel.

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