End plate assembly and battery module

Abstract

The present invention provides an end plate assembly and a battery module. The end plate assembly includes an injection-molded structural member and a metal structural member. The first side of the injection-molded structural member has a belt groove for accommodating a packing belt. The metal structural member includes a support plate and a mounting member provided on one side of the support plate. The support plate is disposed on the second side of the injection-molded structural member, and the mounting member passes through an avoidance hole of the injection-molded structural member and protrudes from the first side of the injection-molded structural member. With the above arrangement, when assembling the battery module, the packing belt can be wound into the belt groove of the injection-molded structural member. In this way, on the one hand, the structural strength of the end plate assembly and the battery module can be ensured by the metal structural member, and on the other hand, the contact area between the packing belt and the end plate assembly is large, so that the force on the end plate assembly and the packing belt is relatively uniform, avoiding stress concentration, thereby improving the stability and reliability of the battery module. And adopting this solution simplifies the structure and assembly process of the battery module, reduces the weight and cost of the battery module.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy, and more particularly, to an end plate assembly and a battery module. Background Art

[0002] As a core component of electric vehicles, the structural stability and reliability of lithium-ion power battery modules directly affect the performance and lifespan of the entire battery system. In the new energy electric vehicle industry, battery modules are usually formed by connecting multiple single cells in series / parallel and placing them between a cover plate and a bottom plate. Side plates and end plates are provided around the multiple single cells, and the bottom plate, side plates, end plates, and cover plate are fixed with bolts. Such battery modules are not only heavy but also costly.

[0003] In the prior art, a battery module is provided, which includes a packing strap, two end plates, an integrated cover plate, and multiple single cells. The multiple single cells are arranged between the two end plates, and the integrated cover plate is disposed above the multiple single cells, and the multiple single cells and the end plates are bundled with the packing strap to form an integral structure. This solution simplifies the structure of the battery module and reduces the weight and cost of the battery module.

[0004] However, the end plates in the existing battery modules are all plate-shaped metal structures. After being bundled with the packing strap, there is a problem of uneven force, and stress concentration occurs at local positions, affecting the stability and reliability of the battery module. Summary of the Invention

[0005] The present invention provides an end plate assembly and a battery module to improve the stability and reliability of the battery module in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, an end plate assembly is provided, including: an injection-molded structural member having opposite first and second sides, the first side of the injection-molded structural member having a strap groove for accommodating a packing strap, and the injection-molded structural member having an avoidance hole; a metal structural member including a support plate and a mounting member provided on one side of the support plate, the support plate being disposed on the second side of the injection-molded structural member, and the mounting member passing through the avoidance hole and protruding from the first side of the injection-molded structural member.

[0007] Further, along the extending direction of the strap groove, there is a strap passing opening for passing the packing strap at each of the two ends of the strap groove, the two strap passing openings are respectively located at two edges of the injection-molded structural member, and the strap passing opening has an arc-shaped transition surface for matching with the bending position of the packing strap.

[0008] Further, two oppositely arranged guiding arc surfaces are further provided inside the tape threading opening. The guiding arc surfaces are used to guide the packing tape. The two guiding arc surfaces are respectively the ends of two opposite side walls of the tape groove, and the arc-shaped transition surface is located between the two guiding arc surfaces. The arc-shaped transition surface is the end of the bottom wall of the tape groove.

[0009] Further, there are a plurality of tape grooves, and the plurality of tape grooves are arranged side by side on the first side of the injection-molded structural member. The mounting member is located between two adjacent tape grooves.

[0010] Further, the injection-molded structural member has process holes, and there are a plurality of the mounting members. The process holes are located between two adjacent mounting members.

[0011] Further, the injection-molded structural member has multiple groups of process holes, and each group of process holes has a plurality of process holes. The mounting member is located between two adjacent groups of process holes.

[0012] Further, the second side of the injection-molded structural member has a mounting groove, at least a part of the support plate is located in the mounting groove, and the side wall of the mounting groove matches the periphery of the support plate located in the mounting groove.

[0013] Further, the mounting member includes a hook-shaped plate arranged vertically and a mounting plate arranged horizontally. The hook-shaped plate and the mounting plate are both connected to the support plate. The hook-shaped plate is used for hoisting. There are two hook-shaped plates, and the two hook-shaped plates are arranged in parallel. The two ends of the mounting plate are respectively and correspondingly connected to the bottoms of the two hook-shaped plates.

[0014] Further, the support plate includes a plate body and a connecting plate arranged at the upper end of the plate body. The plate body is connected to the injection-molded structural member, and at least a part of the connecting plate protrudes from the top end of the injection-molded structural member.

[0015] According to another aspect of the present invention, a battery module is provided. The battery module includes the end plate assembly provided above.

[0016] Applying the technical solution of the present invention, a end plate assembly is provided. The end plate assembly includes an injection-molded structural member and a metal structural member. Among them, the injection-molded structural member has opposite first and second sides. The first side of the injection-molded structural member has a belt groove for accommodating a packing belt, and the injection-molded structural member has an avoidance hole; the metal structural member includes a support plate and a mounting member provided on one side of the support plate. The support plate is provided on the second side of the injection-molded structural member, and the mounting member passes through the avoidance hole and protrudes from the first side of the injection-molded structural member. With the above arrangement, when assembling the battery module, the packing belt can be wound into the belt groove of the injection-molded structural member. In this way, on the one hand, the structural strength of the end plate assembly and the battery module can be ensured by the metal structural member. On the other hand, the packing belt is in direct contact with the injection-molded structural member with relatively low strength and certain deformation ability, rather than in direct contact with the metal material. In this way, the contact area between the packing belt and the end plate assembly can be large, so that the force on the end plate assembly and the packing belt is relatively uniform, avoiding stress concentration, and thus improving the stability and reliability of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of the end plate assembly provided in Embodiment 1 of the present invention;

[0019] Figure 2 shows Figure 1 a view of the other side of the end plate assembly in

[0020] Figure 3 shows Figure 1 a schematic diagram of the injection-molded structural member in

[0021] Figure 4 shows Figure 1 a schematic diagram of the metal structural member in

[0022] Figure 5 shows a schematic structural diagram of the end plate assembly provided in Embodiment 2 of the present invention;

[0023] Figure 6 shows Figure 5 a view of the other side of the end plate assembly in

[0024] Figure 7 shows Figure 6 a schematic diagram of the injection-molded structural member in

[0025] Figure 8 shows Figure 7 a schematic diagram of the metal structural member in

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 110, injection molded structural member; 111, groove; 112, relief hole; 113, arc transition surface; 114, guiding arc surface; 115, process hole; 116, convex plate; 117, annular rib; 120, metal structural member; 121, support plate; 122, mounting member; 123, hook-shaped plate; 124, mounting plate; 125, plate body; 126, connecting plate; 127, notch; 128, card slot. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way constitutes a limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] As shown in the accompanying drawings, an embodiment of the present invention provides an end plate assembly, including: an injection molded structural member 110, the injection molded structural member 110 having opposite first and second sides, the first side of the injection molded structural member 110 having a groove 111 for accommodating a packing belt, the injection molded structural member 110 having a relief hole 112; a metal structural member 120, the metal structural member 120 including a support plate 121 and a mounting member 122 provided on one side of the support plate 121, the support plate 121 being provided on the second side of the injection molded structural member 110, and the mounting member 122 passing through the relief hole 112 and protruding from the first side of the injection molded structural member 110.

[0030] Applying the technical solution of the present invention, a end plate assembly is provided. The end plate assembly includes an injection-molded structural member 110 and a metal structural member 120. Among them, the injection-molded structural member 110 has opposite first and second sides. The first side of the injection-molded structural member 110 has a belt groove 111 for accommodating a packing belt, and the injection-molded structural member 110 has an avoidance hole 112; the metal structural member 120 includes a support plate 121 and a mounting member 122 provided on one side of the support plate 121. The support plate 121 is arranged on the second side of the injection-molded structural member 110, and the mounting member 122 passes through the avoidance hole 112 and protrudes from the first side of the injection-molded structural member 110. With the above arrangement, when assembling the battery module, the packing belt can be wound into the belt groove 111 of the injection-molded structural member 110. In this way, on the one hand, the metal structural member 120 can ensure the structural strength of the end plate assembly and the battery module. On the other hand, the packing belt is in direct contact with the injection-molded structural member 110 with lower strength and certain deformation ability, rather than in direct contact with the metal material. In this way, the contact area between the packing belt and the end plate assembly is large, so that the force on the end plate assembly and the packing belt is relatively uniform, avoiding stress concentration, thereby improving the stability and reliability of the battery module. And, the packing belt can be limited by the belt groove 111, further improving the reliability. The mounting member 122 is used to connect with other structures to facilitate the fixing of the battery module. And, the mounting member 122 can also be used as a lifting point for the lifting equipment to lift the battery module.

[0031] In this embodiment, along the extension direction of the belt groove 111, there is a belt-passing opening for passing the packing belt at each end of the belt groove 111. The two belt-passing openings are respectively located at two edges of the injection-molded structural member 110. The belt-passing opening has an arc-shaped transition surface 113, and the arc-shaped transition surface 113 is used to match the bending position of the packing belt. By providing the belt-passing opening, it is convenient to wind the packing belt. By providing the arc-shaped transition surface 113, the contact surface between the injection-molded structural member 110 and the bending position of the packing belt can be an arc surface, which increases the contact area, avoids stress concentration at the bending position, and makes the packing belt contact the entire bottom wall of the belt groove 111, further increasing the contact area between the packing belt and the end plate assembly, making the force on the end plate assembly uniform, and optimizing the structure of the battery module.

[0032] Furthermore, there are also two oppositely arranged guiding arc surfaces 114 in the belt-passing opening. The guiding arc surfaces 114 are used to guide the packing belt. The two guiding arc surfaces 114 are respectively the ends of two opposite side walls of the belt groove 111. The arc-shaped transition surface 113 is located between the two guiding arc surfaces 114, and the arc-shaped transition surface 113 is the end of the bottom wall of the belt groove 111. With the above arrangement, the width of the belt-passing opening is larger than the width inside the belt groove 111. The packing belt can be guided by the two guiding arc surfaces 114, which is convenient to wind the packing belt into the belt groove 111 and improves the production efficiency.

[0033] Optionally, the bottom of the first side of the injection-molded structural member 110 has a limiting step, through which it can cooperate with other structural members, facilitating the positioning and limiting of the battery module. In this embodiment, the first side of the injection-molded structural member 110 refers to the side facing outside the battery module, and the second side of the injection-molded structural member 110 refers to the side facing inside the battery module.

[0034] Optionally, the mounting member 122 is located in the middle of the injection-molded structural member 110, that is, the top end of the mounting member 122 has a first preset distance from the top end of the injection-molded structural member 110, and the bottom end of the mounting member 122 has a second preset distance from the bottom end of the injection-molded structural member 110. With the above settings, after the battery module is fixed to other structural members through the mounting member 122, for example, fixed to the vehicle chassis, since the mounting member 122 is located in the middle of the battery module, the torque borne by the battery module can be reduced, improving the structural stability.

[0035] In this embodiment, there are multiple grooved slots 111, and the multiple grooved slots 111 are arranged side by side on the first side of the injection-molded structural member 110, and the mounting member 122 is located between two adjacent grooved slots 111. By setting multiple grooved slots 111, multiple packing straps can be correspondingly wound, thereby improving the overall structural strength of the battery module. Optionally, there are two grooved slots 111, and both of the two grooved slots 111 extend in the horizontal direction.

[0036] The end plate assembly in this solution can have different forms. For example, as Figures 1 to 4 shown, in the first embodiment, the injection-molded structural member 110 has a process hole 115, and there are multiple mounting members 122, and the process hole 115 is located between two adjacent mounting members 122. Or, as Figures 5 to 8 shown, the injection-molded structural member 110 has multiple groups of process holes 115, and each group of process holes 115 has multiple process holes 115, and the mounting member 122 is located between two adjacent groups of process holes 115. By setting multiple mounting members 122, the connection strength and structural stability between the battery module and other structures can be improved. The process hole 115 can facilitate the injection molding process of the injection-molded structural member 110, and can reduce the material usage, weight and cost.

[0037] Optionally, there is an annular rib 117 on the periphery of the process hole 115. By setting the annular rib 117, the structural strength and load-bearing capacity of the injection-molded structural member 110 can be improved.

[0038] Optionally, the support plate 121 has a notch 127 for avoiding multiple process holes 115. Optionally, multiple reinforcing ribs are provided on the second side of the injection-molded structural member 110, which can further improve the structural strength and load-bearing capacity of the injection-molded structural member 110.

[0039] In the above embodiments, the second side of the injection-molded structural member 110 has a mounting groove, at least a part of the support plate 121 is located in the mounting groove, and the side wall of the mounting groove matches the periphery of the support plate 121 located in the mounting groove. Matching the side wall of the mounting groove with the periphery of the support plate 121 located in the mounting groove can position and limit the support plate 121, facilitate assembly, and can achieve a reliable connection between the injection-molded structural member 110 and the metal structural member 120, thereby improving the structural strength of the end plate assembly.

[0040] In this embodiment, the mounting member 122 includes a hook-shaped plate 123 arranged vertically and a mounting plate 124 arranged horizontally. Both the hook-shaped plate 123 and the mounting plate 124 are connected to the support plate 121. The hook-shaped plate 123 is used for hoisting; there are two hook-shaped plates 123, and the two hook-shaped plates 123 are arranged in parallel. The two ends of the mounting plate 124 are respectively connected to the bottoms of the two hook-shaped plates 123 in a one-to-one correspondence. Since the hook-shaped plate 123 has a hook-shaped structure and is convenient for connecting with hoisting equipment, it is convenient for hoisting the battery module. Through the mounting plate 124, the battery module can be conveniently and fixedly connected to other structures. Moreover, the above arrangement of the hook-shaped plate 123 and the mounting plate 124 can improve the bearing capacity and structural strength of the mounting member 122.

[0041] Optionally, the mounting plate 124 has holes for mounting fasteners, so as to facilitate passing through the fasteners and connecting with other structures.

[0042] Optionally, a convex plate 116 is provided on the upper edge of the avoidance hole 112. The convex plate 116 is located between the two hook-shaped plates 123, and the width of the convex plate 116 is smaller than the width of the avoidance hole 112. The side surface of the convex plate 116 contacts the side surface of the support plate 121. Through the above settings, the strength of the end plate assembly can be improved.

[0043] Further, the support plate 121 includes a plate body 125 and a connecting plate 126 provided at the upper end of the plate body 125. The plate body 125 is connected to the injection-molded structural member 110, and at least a part of the connecting plate 126 protrudes from the top end of the injection-molded structural member 110. The plate body 125 mainly plays a role in support and ensuring strength, and the connecting plate 126 is used to connect with other structures of the battery module to realize the connection between the end plate assembly and other structures, make the battery module a whole, and ensure structural stability.

[0044] Optionally, the connecting plate 126 has through holes for passing through fasteners, so that it is convenient to connect through fasteners. A card slot 128 is provided on each side of the connecting plate 126, so that it is convenient to snap the connecting plate 126 with other structures of the battery module, facilitate assembly, and can improve the stability and reliability of the structure.

[0045] Another embodiment of the present invention provides a battery module, which includes the end plate assembly provided above. With the above arrangement, when assembling the battery module, the packing strap can be wound into the strap groove 111 of the injection-molded structural member 110. In this way, on the one hand, the metal structural member 120 can ensure the structural strength of the end plate assembly and the battery module. On the other hand, the packing strap is in direct contact with the injection-molded structural member 110 with relatively low strength and certain deformation ability, rather than directly contacting the metal material. This can make the contact area between the packing strap and the end plate assembly large, so that the forces on the end plate assembly and the packing strap are relatively uniform, avoiding stress concentration, and thus improving the stability and reliability of the battery module. Moreover, the strap groove 111 can play a role in limiting the packing strap, further improving the reliability. The mounting member 122 is used to connect with other structures to facilitate the fixation of the battery module. In addition, the mounting member 122 can also be used as a lifting point for a lifting device to lift the battery module.

[0046] Adopting the above solution simplifies the structure of the battery module, simplifies the assembly process, reduces the weight and cost of the battery module, improves the force uniformity at different positions of the battery module, and improves the stability, reliability and service life of the battery module.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An end plate assembly, characterized in that, Including: An injection-molded structural member (110), the injection-molded structural member (110) having opposite first and second sides, a belt groove (111) for accommodating a packing belt on the first side of the injection-molded structural member (110), and the injection-molded structural member (110) having an avoidance hole (112); along the extending direction of the belt groove (111), there is a belt-passing opening for passing through the packing belt at each of the two ends of the belt groove (111), the two belt-passing openings are respectively located at two edges of the injection-molded structural member (110), an arc transition surface (113) is provided in the belt-passing opening, and the arc transition surface (113) is used to match the bending position of the packing belt; two guiding arc surfaces (114) are also provided in the belt-passing opening, the guiding arc surfaces (114) are used to guide the packing belt, the two guiding arc surfaces (114) are respectively the ends of two opposite side walls of the belt groove (111), the arc transition surface (113) is located between the two guiding arc surfaces (114), and the arc transition surface (113) is the end of the bottom wall of the belt groove (111); A metal structural member (120), the metal structural member (120) including a support plate (121) and a mounting member (122) provided on one side of the support plate (121), the support plate (121) being provided on the second side of the injection-molded structural member (110), and the mounting member (122) passing through the avoidance hole (112) and protruding from the first side of the injection-molded structural member (110); The second side of the injection-molded structural member (110) has a mounting groove, at least a part of the support plate (121) is located in the mounting groove, and the side wall of the mounting groove matches the periphery of the support plate (121) located in the mounting groove; The bottom of the first side of the injection-molded structural member (110) has a limiting step, and the limiting step cooperates with other structural members; A convex plate (116) is provided on the upper edge of the avoidance hole (112), and the width of the convex plate (116) is smaller than the width of the avoidance hole (112).

2. The end plate assembly according to claim 1, wherein There are multiple belt grooves (111), and the multiple belt grooves (111) are arranged side by side on the first side of the injection-molded structural member (110), and the mounting member (122) is located between two adjacent belt grooves (111); 3. The end plate assembly according to claim 1, wherein, The injection-molded structural member (110) has a process hole (115), there are multiple mounting members (122), and the process hole (115) is located between two adjacent mounting members (122); 4. The end plate assembly according to claim 1, characterized in that The injection-molded structural member (110) has multiple groups of process holes (115), each group of process holes (115) has multiple process holes (115), and the mounting member (122) is located between two adjacent groups of process holes (115); 5. The end plate assembly according to claim 1, wherein The mounting member (122) includes a vertically arranged hook-shaped plate (123) and a horizontally arranged mounting plate (124). Both the hook-shaped plate (123) and the mounting plate (124) are connected to the support plate (121). The hook-shaped plate (123) is used for hoisting; There are two hook-shaped plates (123), and the two hook-shaped plates (123) are arranged in parallel. The two ends of the mounting plate (124) are respectively connected to the bottoms of the two hook-shaped plates (123) in a one-to-one correspondence.

6. The end plate assembly according to claim 1, characterized in that, The support plate (121) includes a plate body (125) and a connecting plate (126) arranged at the upper end of the plate body (125). The plate body (125) is connected to the injection-molded structural member (110), and at least a part of the connecting plate (126) protrudes from the top end of the injection-molded structural member (110).

7. A battery module, characterized in that, The battery module includes the end plate assembly according to any one of claims 1 to 6.

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