A battery module end plate

Abstract

This utility model relates to the field of battery technology, specifically to a battery module end plate, including a body, with buffer cavities on both sides of the body. The buffer cavities on both sides are used to enhance the contact between the battery cell assembly and the end plate. At the same time, the plane between the buffer cavities can absorb the expansion force of the battery cell assembly to a greater extent. A buffer groove is provided in the middle of the body, and the buffer groove is recessed from the inner side of the battery cell assembly to the side away from the battery cell assembly. The battery module end plate of this utility model has a buffer groove on the body to absorb the expansion force generated by the battery cell assembly during use. The body also has buffer cavities to enhance the contact between battery cells. A huge buffer part is also formed between the fixed buffer cavities on both sides, which can further absorb the expansion force of the battery module on the basis of the buffer groove.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery module end plate. Background Technology

[0002] With the development of various technologies and applications in the new energy field, and the changes in the current international situation, new energy batteries have attracted much attention and have a huge market prospect. In addition to their application in new energy vehicles, lithium-ion batteries are gradually penetrating into industries such as low-speed two-wheeled vehicles and electric motorcycles. Electric motorcycles, due to their requirements for overall vehicle weight, spatial constraints, and high performance, place higher demands on the energy density, rate performance, and safety of the lithium-ion batteries used. Pouch lithium-ion batteries, due to their advantages such as light weight, high energy density, good safety performance, long cycle life, and large battery capacity, are widely used in the electric motorcycle field.

[0003] To achieve overall lightweighting and improve space utilization, electric motorcycle battery packs typically employ a direct assembly method, placing battery modules within the battery housing. Alternatively, they may use flat end plates and side plates connected by welding or screws to form a battery compartment, housing multiple battery cells. However, the expansion force of these cell groups, especially pouch cells, during use is entirely concentrated on the plane of the end plate. Furthermore, the end plate's high rigidity allows it to absorb only a small portion of the expansion force, leaving most of it to act directly on the weld seams of the side plates. When the expansion force exceeds the weld seam's strength, the weld seam tears, leading to battery module failure. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a battery module end plate with a buffer groove on the body to absorb the expansion force generated by the battery cell assembly during use. A buffer cavity is also provided on the body to enhance the contact between battery cells. A huge buffer part is also formed between the fixed buffer cavities on both sides, which can further absorb the expansion force of the battery module on the basis of the buffer groove.

[0005] This utility model is achieved through the following technical solution:

[0006] A battery module end plate includes a body, with buffer cavities on both sides of the body. The buffer cavities on both sides are used to enhance the contact between the battery cell assembly and the end plate. At the same time, the plane between the buffer cavities can absorb the expansion force of the battery cell assembly to a greater extent. A buffer groove is provided in the middle of the body, and the buffer groove is recessed from the inner side of the battery cell assembly to the direction away from the battery cell assembly.

[0007] More preferably, the buffer cavity includes a first bend, a second bend, and a third bend. The first bend, the second bend, and the third bend, together with the body, form a square buffer cavity. The second bend has a plurality of circular through holes evenly distributed on it for stress relief of the body and to reduce the weight of the end plate.

[0008] More preferably, the first bending portion is provided with a connecting hole for connecting with the battery module side plate screw, and the third bending portion is arranged parallel to the first bending portion on both sides of the second bending portion.

[0009] In a further preferred embodiment, a fixing part 1 is provided at the middle position of the top of the main body, and a connecting hole 2 is provided on the fixing part 1 for connecting with the screws of the battery pack cover.

[0010] More preferably, the bottom of the main body is provided with two symmetrical fixing parts, and the fixing parts are provided with waist-shaped holes for connecting with the bracket of the box.

[0011] The beneficial effects of this utility model are:

[0012] 1) The battery module end plate of this utility model is mainly made of aluminum plate and formed by sheet metal processing. The end plate has an "I"-shaped buffer groove inside the plane that contacts the battery module to absorb the expansion force generated by the battery cell during use. The two sides of the end plate are bent three times to form a fixed buffer cavity, which enhances the contact between battery cells. A huge buffer part is also formed between the fixed buffer cavities on both sides, which can further absorb the expansion force of the battery module on the basis of the buffer groove.

[0013] 2) This utility model has a connecting hole on the first bend, which is fixed to the side plate of the battery module by screw connection, fixing the battery cell assembly in the receiving cavity formed by the end plate and the side plate. The outer side of the second bend contacts the inner wall of the battery pack box, improving the overall stability of the battery module. The third bend and the first bend further strengthen the structural strength of the battery module.

[0014] 3) The end plate of this utility model has two fixing parts at the bottom and symmetrically distributed waist-shaped holes. It is fixed to the bracket inside the battery pack box by riveting, so as to avoid damage to the battery cells caused by the movement of the cell modules. The end plate has a fixing part at the top, and the fixing part has a connecting hole. It is fixed to the battery pack box cover by screw connection, which further enhances the firmness and reliability of the battery modules and improves the overall safety of the battery pack.

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a battery module end plate according to the present invention.

[0018] 1-Main body, 2-Fixing part one, 21-Connecting hole two, 3-Buffer cavity, 31-First bending part, 311-Connecting hole one, 32-Second bending part, 321-Through hole, 33-Third bending part, 4-Buffer groove, 5-Fixing part two, 51-Oval hole. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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. They 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] A battery module end plate, reference Figure 1 The device includes a main body 1, with buffer cavities 3 of the same size on both sides. The buffer cavities 3 are fixed to the battery module side plates by screws. The cell assembly receiving cavity formed by the buffer cavities and the side plates allows the battery cells to fit tightly together. The top of the main body 1 has a fixing part 2 for fixing to the battery pack cover. The bottom of the main body 1 has two symmetrical fixing parts 5 for connecting to the bracket inside the box. The main body 1 is fixed to the module side plates on both sides of its width, and fixed to the box cover and the bracket inside the box on its top and bottom sides, respectively. By strengthening the fixation of the battery module, the device can absorb the expansion force of the cell assembly to a greater extent, thereby ensuring the firmness and reliability of the entire battery pack and avoiding battery module failure.

[0024] The top of the main body 1 is provided with a fixing part 2 for fixing to the battery pack cover. The fixing part 2 is provided in the middle of the width direction of the main body 1 by sheet metal. The fixing part 2 is provided with a connecting hole 21. After the battery pack is installed, it is fixed to the battery pack cover by screw connection, which enhances the overall structural stability of the battery pack.

[0025] The bottom edge of the main body 1 has two symmetrical fixing parts 2 5 provided by sheet metal. The fixing parts 2 5 are provided with waist-shaped holes 51, which are connected to the bracket inside the box by riveting to fix the battery module inside the battery pack, thereby improving the overall structural strength of the battery pack.

[0026] The body 1 has two square buffer cavities 3 formed by three bends along its width. Each buffer cavity 3 includes a first bend 31, a second bend 32, and a third bend 33. The first bend 31, the second bend 32, and the third bend 33, together with the body 1, form the square buffer cavity 3. The third bend 33 is arranged parallel to the first bend 31 on both sides of the second bend 32. A connecting hole 311 is provided on the first bend 31, which is fixed to the side plate of the battery module by screws to accommodate the battery module. The first bend 32 is assembled into a cavity, which allows the battery cells to fit tightly together. After assembly, the second bend 32 contacts the battery pack housing. The second bend 32 is provided with multiple circular through holes 321 evenly to release stress on the main body 1 and reduce the weight of the end plate, thus achieving a lightweight battery pack. The third bend 33 has the same dimensions as the first bend 31. The buffer cavities 3 on the left and right sides further strengthen the contact between the cell assembly and the end plate. At the same time, the plane between the buffer cavities 3 can absorb the expansion force of the cell assembly to a greater extent, thus preventing the failure of the battery module.

[0027] The body 1 has an "I"-shaped buffer groove 4 in the plane, which is recessed from the inside of the end plate cell group to the direction away from the cell group, with a depth of no more than 3mm. Since the expansion of the cell is the largest at the center of the large surface of the cell and extends to both sides, the buffer groove 4 is set in the middle of the plane of the body 1 to absorb the expansion force of the cell group.

[0028] This utility model discloses a battery module end plate. The body 1 is formed by sheet metal processing and other methods. The plane in contact with the battery module has an "I"-shaped buffer groove 4 to absorb the expansion force generated by the battery cell assembly during use. The two sides of the end plate body 1 are bent three times in the width direction to form a fixed buffer cavity 3, which enhances the contact between battery cells. A huge buffer part is also formed between the fixed buffer cavities 3 on both sides, which can further absorb the expansion force of the battery module on the basis of the buffer groove 4. A connecting hole 311 is provided on the first bending part 31, which is fixed to the side plate of the battery module by screw connection, fixing the battery cell assembly in the receiving cavity formed by the end plate and the side plate. The outer side of the second bending part 32 contacts the inner wall of the battery pack box, which improves the overall stability of the battery module. The third bending part 33 and the first bending part 31 further strengthen the structural strength of the battery module. A fixing part 5 is provided at the bottom and symmetrically distributed waist-shaped holes 51 are provided, which are fixed to the bracket inside the battery pack box by riveting to avoid damage to the battery cells caused by the movement of the battery cell module. The top of the end plate body 1 is provided with a fixing part 2, which is provided with a connecting hole 21. It is fixed to the battery pack cover by screw connection, which further enhances the robustness and reliability of the battery module and improves the overall safety of the battery pack.

[0029] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A battery module end plate, characterized in that: Includes a body (1), with buffer cavities (3) on both sides of the body (1). The buffer cavities (3) on both sides are used to strengthen the contact between the battery cell assembly and the end plate. At the same time, the plane between the two buffer cavities (3) is used to absorb the expansion force of the battery cell assembly. A buffer groove (4) is provided in the middle of the body (1). The buffer groove (4) is recessed from the inner side of the battery cell assembly to the direction away from the battery cell assembly.

2. The battery module end plate according to claim 1, characterized in that: The buffer cavity (3) includes a first bend (31), a second bend (32) and a third bend (33). The first bend (31), the second bend (32) and the third bend (33) together with the body (1) form a square buffer cavity (3). The second bend (32) is provided with a plurality of circular through holes (321) for stress relief of the body (1) and to reduce the weight of the end plate.

3. A battery module end plate according to claim 2, characterized in that: The first bending part (31) is provided with a connecting hole (311) for connecting with the battery module side plate screw. The third bending part (33) is arranged parallel to the first bending part (31) on both sides of the second bending part (32).

4. A battery module end plate according to claim 1, characterized in that: The main body (1) has a fixing part (2) at the top center, and the fixing part (2) has a connecting hole (21) for connecting with the battery pack cover screw.

5. A battery module end plate according to claim 1, characterized in that: The bottom of the main body (1) is provided with two symmetrical fixing parts (5), and the fixing parts (5) are provided with waist-shaped holes (51) for connecting with the bracket of the box.

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