Module-free end plate, battery module and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a module-free end plate, a battery module and a battery, the end plate is used in the battery module and comprises a first plate and a second plate which is intersected and connected with the first plate; a plurality of first position holes are formed in the first plate in the length direction, and a plurality of extrusion areas are formed in the side face, away from the second plate, of the first plate in the length direction; a plurality of second position holes are formed in the second plate in the length direction. When the end plate is used, the connecting pieces penetrate through the second position holes to mount the end plate to a required position, the connecting pieces penetrate through the first position holes to connect the first plate to a cross beam of the battery module, and the extrusion area of the first plate can provide extrusion pre-tightening force in the stacking direction of the battery monomers; and therefore, the fixing effect of the single batteries in the stacking direction is ensured. Only one end plate needs to be arranged at one end part of the battery module, so that the number of the arranged end plates is reduced, and later assembly is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a module-free end plate, a battery module and a battery. Background Art

[0002] A battery pack is usually composed of several battery modules, and the battery cells in the battery module are often fixed with structures such as end plates.

[0003] The patent with publication number CN217719861U provides an end plate, which is applied to a battery module, and the battery cells in the battery module are fixed through the fixing holes to complete the assembly of the battery module. Since the second direction in which the reinforcement extends intersects with the length direction in which the fixing holes extend, and there is at least a partial intersection between the fixing holes and the reinforcement, the reinforcement can have good resistance to the force on the fixing holes and the shear force in the middle perpendicular to the length direction, thereby improving the bending resistance of the end plate against the expansion force of the battery cells, which is conducive to ensuring a more stable battery module.

[0004] As mentioned above, in the end plate structure, most of the battery module end plates in the current battery pack are first fixed into a single small module by extrusion tooling through welding, riveting or rolling and packaging, and then the small module is assembled into the battery pack. This form has a large number of modules, that is, a large number of end plates, resulting in many assembly steps. In addition, this form of end plate is difficult to provide pre-tightening force to fix the battery cell. Summary of the invention

[0005] The utility model aims to provide a module-free end plate, a battery module and a battery, so as to solve the problem that the end plate in the existing battery module cannot provide pre-tightening force to fix the battery monomer, and multiple end plates need to be arranged at the end of the battery module.

[0006] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0007] In a first aspect, the present application discloses a module-free end plate for use in a battery module, comprising a first plate and a second plate intersecting and connected to the first plate;

[0008] The first plate is provided with a plurality of first holes along the length direction, and a side of the first plate away from the second plate forms a plurality of extrusion areas along the length direction;

[0009] The second plate is provided with a plurality of second holes along the length direction.

[0010] Further, the second plate is vertically connected to the first plate;

[0011] The dimension L of the first plate in the length direction is greater than the dimension H of the first plate in the height direction;

[0012] A dimension L of the second plate in the length direction is greater than a dimension W of the second plate in the width direction.

[0013] In this solution, the first plate is set to have a larger length dimension, which provides a basis for forming multiple extrusion areas on the first plate. The length of the second plate is the same as that of the first plate, ensuring the fixing effect of the end plate and the stable supporting connection to the first plate.

[0014] Furthermore, the ratio of the length to the height of the first plate is in the range of: 1.5≤L / H≤20;

[0015] The ratio of the length direction to the width direction of the second plate is in the range of 10≤L / W≤45.

[0016] Furthermore, the second hole is a waist-shaped hole.

[0017] This solution can compensate for the dimensional tolerance caused by extrusion and fixation in the working direction (battery stacking direction) of the first hole through the design of the waist hole. While providing the appropriate extrusion force for the battery, it has a certain size adjustment function, thereby improving the assembly tolerance.

[0018] Furthermore, a transverse rib along the length direction is provided on one side of the first plate close to the second plate;

[0019] A longitudinal rib perpendicular to the transverse rib is also provided on one side of the first plate close to the second plate.

[0020] In this solution, the setting of transverse and longitudinal ribs can improve the resistance to battery expansion force, vibration and impact, greatly improve its structural strength, and have good bending and shear resistance.

[0021] Furthermore, the width of the transverse rib is t1, t1≥2.0 mm, and the width of the longitudinal rib is t2, t2≥1.5 mm.

[0022] Furthermore, a plurality of liquid cooling avoidance openings are provided between the first plate and the second plate along the length direction;

[0023] The first plate is also provided with a plurality of harness fixing holes along the length direction;

[0024] The first plate is also provided with a plurality of battery output pole base mounting parts along the length direction.

[0025] Furthermore, the end plate is an integrally formed end plate.

[0026] In a second aspect, the present application discloses a battery module, comprising:

[0027] A plurality of battery packs arranged side by side, each of the battery packs comprising a plurality of battery cells arranged in a stack;

[0028] Two end plates as described in any one of the first aspects, the two end plates are respectively arranged on opposite sides of the battery monomer stacking direction; wherein the number of the extruded areas on the first plate is the same as the number of the battery packs;

[0029] The connector is used to penetrate the second hole to install the end plate in the battery module, and is also used to penetrate the first hole to connect the first plate to the crossbeam of the battery module so that the extrusion area on the first plate provides an extrusion preload in the battery cell stacking direction.

[0030] In a third aspect, the present application discloses a battery, comprising the battery module described in the second aspect.

[0031] According to the above technical solution, the beneficial effects of the utility model are:

[0032] When the end plate of the present application is used, the end plate can be installed to a desired position by passing the connecting member through the second hole, and the first plate can be connected to the crossbeam of the battery module by passing the connecting member through the first hole. The extrusion area of ​​the first plate can provide an extrusion pre-tightening force in the stacking direction of the battery cells, thereby ensuring the fixing effect of the battery cells in the stacking direction;

[0033] A plurality of extrusion areas are formed along the length direction of the first plate of the present application, and each extrusion area can act on a battery pack in the battery pack module. The arrangement of the plurality of extrusion areas eliminates the need to arrange a plurality of end plates at the end of the battery module, and only one end plate is required at one end of the battery module, thereby reducing the number of end plates arranged and facilitating later assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the end plate of the utility model;

[0035] Figure 2 for Figure 1 The main view;

[0036] Figure 3 for Figure 1 A top view of

[0037] Figure 4 It is a schematic diagram of the dimensions of the end plate of the utility model;

[0038] Figure 5 It is a partial schematic diagram of the installation of the end plate in the module;

[0039] Figure 6 A top view of the end plate installed in the module.

[0040] Among them: 1. End plate; 11. First plate; 111. First hole; 12. Second plate; 121. Second hole; 13. Horizontal ribs; 14. Longitudinal ribs; 15. Liquid cooling avoidance port; 16. Wire harness hole; 17. Battery output pole base mounting part; 2. Battery pack. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0042] It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0043] like Figures 1 to 6 As shown, the present application discloses a module-free end plate for use in a battery module, comprising a first plate 11 and a second plate 12 intersecting and connected to the first plate 11; the first plate 11 is provided with a plurality of first position holes 111 along the length direction, and a side of the first plate 11 away from the second plate 12 forms a plurality of extrusion areas along the length direction; the second plate 12 is provided with a plurality of second position holes 121 along the length direction.

[0044] In the present application, the extrusion area is an area formed on the surface of the first plate 11. The extrusion area cannot be recessed on the surface of the first plate. It can be flush with the surface of the first plate or convex on the surface of the first plate. After the end plate 1 is installed, the extrusion area needs to contact the battery cell to squeeze the battery cell.

[0045] The first plate 11 is provided with a plurality of first holes 111 along the length direction, and the second plate 12 is provided with a plurality of second holes 121 along the length direction. The first holes 111 can be arranged on the first plate 11 in a uniform or uneven manner, and the intervals thereof are set as required. When a large extrusion preload is required, the interval between two adjacent first holes is set smaller, and on the contrary, the interval between two adjacent first holes 111 is increased. Similarly, the second holes 121 can be arranged in the same manner as the first holes 111.

[0046] When the end plate of the present application is in use, the end plate 1 can be installed to the required position by passing the second position hole 121 through the connecting piece, and the first plate 11 can be connected to the crossbeam of the battery module by passing the first position hole 111 through the connecting piece. The extrusion area of ​​the first plate 11 can provide an extrusion preload in the stacking direction of the battery cells, thereby ensuring the fixing effect of the battery cells in the stacking direction.

[0047] A plurality of extrusion areas are formed on the first plate 11 of the present application along the length direction, and each extrusion area can act on a battery pack in the battery pack module. The arrangement of the plurality of extrusion areas eliminates the need to arrange a plurality of end plates at the end of the battery module, and only one end plate is required at one end of the battery module, thereby reducing the number of end plates arranged and facilitating later assembly.

[0048] In one embodiment, the second plate is vertically connected to the bottom end of the first plate, and the length dimension L of the first plate is greater than the height dimension H of the first plate; the length dimension L of the second plate is greater than the width dimension W of the second plate.

[0049] In this solution, the first plate 11 is set to have a larger length dimension, which provides a basis for forming multiple extrusion areas on the first plate 11. The length of the second plate is the same as that of the first plate, which ensures the fixing effect of the end plate and the stable support connection to the first plate. When an L-shaped end plate is set, the end plate can be installed through the second plate while the first plate acts on the battery, which facilitates the installation and fixation of the end plate as a whole.

[0050] Furthermore, the ratio of the length to the height of the first plate 11 is in the range of 1.5≤L / H≤20; the ratio of the length to the width of the second plate is in the range of 10≤L / W≤45.

[0051] In a further embodiment, the second hole is a waist-shaped hole. The waist-shaped hole design can compensate for the dimensional tolerance caused by the extrusion fixation in the battery stacking direction (i.e., the X direction in the figure), and has a certain dimensional adjustment function while providing a suitable extrusion force for the battery, thereby improving the assembly error tolerance.

[0052] At present, the battery module end plate in the battery pack has poor structural strength and weak bending resistance to battery expansion. In order to solve this problem, in a further embodiment, a side surface of the first plate 11 close to the second plate 12 is provided with a transverse rib 13 along the length direction; a side surface of the first plate 11 close to the second plate 13 is also provided with a longitudinal rib 14 perpendicular to the transverse rib 13.

[0053] By arranging the transverse ribs 13 and the longitudinal ribs 14 on the first plate 11, the resistance to battery expansion force and vibration and impact is improved, the structural strength is greatly improved, and the bending and shearing resistance are good.

[0054] Furthermore, the longitudinal ribs 14 may be connected to the second plate to increase the overall strength of the end plate 1. The longitudinal ribs 14 may have the same dimensions in the width direction, or the longitudinal ribs may have dimensions that gradually increase from top to bottom in the width direction.

[0055] In a further embodiment, the width of the transverse rib 13 is t1, t1≥2.0 mm, and the width of the longitudinal rib 14 is t2, t2≥1.5 mm. The structural strength, bending resistance and shear resistance of the end plate are ensured by designing the width of the transverse rib 13 and the longitudinal rib 14.

[0056] In one embodiment, a plurality of liquid cooling avoidance openings 15 are provided between the first plate and the second plate along the length direction; a plurality of harness fixing holes 16 are provided on the first plate along the length direction; and a plurality of battery output pole base mounting portions 17 are provided on the first plate along the length direction. This arrangement can meet the installation requirements of the liquid cooling device, harness and battery output pole base.

[0057] In the present application, the material of the end plate can be a metal material, such as aluminum and its alloys, steel, or a plastic material, such as PP, PC, ABS, etc., and its molding process is one-piece molding, such as metal cast aluminum molding, plastic injection molding, etc. The end plate made by the one-piece molding process can ensure the overall strength of the end plate.

[0058] In summary, the end plate of the present application has the following advantages: high integration, streamlined number of end plates of small-module battery packs, and greatly simplified assembly process. Horizontal and vertical ribs are provided to enhance resistance to battery expansion force and vibration and impact performance, greatly improve its structural strength, and have good bending and shear resistance and high structural strength. Fixed points are provided in the battery stacking direction, so that the batteries can be extruded and fixed in the battery pack, and the extrusion assembly of the batteries inside the battery pack is realized, which greatly reduces the process difficulty and production cost. Fixed points are provided in the Z direction of the battery pack, and the Z-direction fixed points are designed as waist holes, which can compensate for the dimensional tolerance caused by the extrusion and fixation in the battery stacking direction, have certain extrusion force and size adjustment functions, and improve the assembly fault tolerance. Output pole base installation and wiring harness fixing points are provided, which have good adaptability.

[0059] According to some embodiments of the present application, the present application also provides a battery module, such as Figure 5 and Figure 6As shown, the battery module includes a connector, a plurality of battery packs 2 arranged side by side, and two or more end plates 1 in any one of the schemes, each battery pack 2 includes a plurality of stacked battery cells; two end plates 1 are respectively arranged on opposite sides of the battery cell stacking direction; wherein the number of extrusion areas on the first plate is the same as the number of battery packs. The connector is used to penetrate the second position hole 121 to install the end plate 1 in the battery module, and is also used to penetrate the first position hole 111 to connect the first plate to the crossbeam of the battery module, so that the extrusion area on the first plate 11 provides an extrusion preload in the battery cell stacking direction.

[0060] The connecting member may be a bolt or a rivet, and the end plate is connected to the cross beam in the X direction by bolt connection or riveting, providing an X-direction extrusion force to fix the battery, wherein the fixing method is preferably bolt fixing. Similarly, the end plate is connected to the cross beam in the Z direction, providing an Z-direction extrusion force to fix the battery, wherein the fixing method is preferably bolt fixing.

[0061] In this embodiment, the number of the extrusion areas on the first plate is the same as the number of the battery packs. When the end plate 1 is installed, each extrusion area corresponds to a battery pack to ensure that each extrusion area acts on a battery pack 2.

[0062] In one embodiment, the present application further provides a battery, which includes the battery module of any embodiment of the present application.

[0063] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A module-free end plate, used in a battery module, characterized in that: It comprises a first plate and a second plate intersecting and connected with the first plate; The first plate is provided with a plurality of first holes along the length direction, and a side of the first plate away from the second plate forms a plurality of extrusion areas along the length direction; The second plate is provided with a plurality of second holes along the length direction.

2. The module-free end plate according to claim 1, characterized in that: The second plate is vertically connected to the first plate; The dimension L of the first plate in the length direction is greater than the dimension H of the first plate in the height direction; A dimension L of the second plate in the length direction is greater than a dimension W of the second plate in the width direction.

3. The module-free end plate according to claim 2, characterized in that: The ratio of the length to the height of the first plate is in the range of: 1.5≤L / H≤20; The ratio of the length direction to the width direction of the second plate is in the range of 10≤L / W≤45.

4. The module-free end plate according to claim 1, characterized in that: The second hole is a waist-shaped hole.

5. The module-free end plate according to claim 1, characterized in that: A transverse rib along the length direction is provided on one side of the first plate close to the second plate; A longitudinal rib perpendicular to the transverse rib is also provided on one side of the first plate close to the second plate.

6. The module-free end plate according to claim 5, characterized in that: The width of the transverse rib is t1, t1≥2.0mm, and the width of the longitudinal rib is t2, t2≥1.5mm.

7. The module-free end plate according to claim 1, characterized in that: A plurality of liquid cooling avoidance openings are also provided between the first plate and the second plate along the length direction; The first plate is also provided with a plurality of harness fixing holes along the length direction; The first plate is also provided with a plurality of battery output pole base mounting parts along the length direction.

8. The module-free end plate according to claim 1, characterized in that: The end plate is an integrally formed end plate.

9. A battery module, characterized in that: include: A plurality of battery packs arranged side by side, each of the battery packs comprising a plurality of battery cells arranged in a stack; Two end plates according to any one of claims 1 to 8, the two end plates being respectively arranged on opposite sides of the battery cell stacking direction; wherein the number of the extruded areas on the first plate is the same as the number of the battery packs; The connector is used to penetrate the second hole to install the end plate in the battery module, and is also used to penetrate the first hole to connect the first plate to the crossbeam of the battery module so that the extrusion area on the first plate provides an extrusion preload in the battery cell stacking direction.

10. A battery, characterized in that: Comprising the battery module as claimed in claim 9.

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