Battery box

Abstract

The invention provides a battery box. The battery box is used for accommodating a battery cell group and comprises a shell, at least one extrusion assembly and a pressure cylinder unit, the shell is used for accommodating the battery cell group; the at least one extrusion assembly comprises an extrusion plate and a pushed plate, the extrusion plate is used for being stacked on one side of the battery cell group, and the pushed plate is used for being stacked on one side, away from the battery cell group, of the extrusion plate. The pushed plate comprises a frame and a plurality of supports, and the supports are connected to the frame and surrounded by the frame. The pressing cylinder unit is arranged in the shell and used for pushing and abutting against the pushed plate.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present invention claims priority to Taiwan Patent Application No. 112143986 filed on November 15, 2023, which is incorporated herein by reference for all purposes as if fully set forth herein. Technical Field

[0003] The invention relates to an electric energy storage device, and in particular to a battery box. Background Art

[0004] Due to its high capacitance, some manufacturers will use lithium metal batteries to replace lithium ion batteries as power modules for vehicles such as electric motorcycles. In order for lithium metal batteries to have good electrical properties, a certain amount of pressure needs to be applied to them during charging and discharging so that the lithium metal deposited on the negative electrode surface can have a dense and smooth surface.

[0005] However, the pressure applying means of the prior art often cannot apply pressure to the lithium metal battery uniformly, so that part of the lithium metal deposited on the negative electrode surface still has a non-dense and smooth surface, thereby deteriorating the electrical properties of the lithium metal battery. Alternatively, in the housing containing the lithium metal battery, the existing pressure applying means will greatly occupy the internal space for the lithium metal battery, so that the number of lithium metal batteries is limited. Summary of the invention

[0006] The present invention provides a battery box which can evenly apply pressure to a battery cell group or increase the number of battery cells.

[0007] One embodiment of the present invention provides a battery box for accommodating a battery cell group and includes a shell, at least one extrusion assembly and a pressure cylinder unit. The shell is used to accommodate the battery cell group. The at least one extrusion assembly includes a pressing plate and a push plate. The pressing plate is used to be stacked on one side of the battery cell group. The push plate is used to be stacked on the side of the pressing plate away from the battery cell group. The push plate includes a frame and a plurality of brackets. The brackets are connected to the frame and surrounded by the frame. The pressure cylinder unit is arranged in the shell and is used to push against the push plate.

[0008] Another embodiment of the present invention provides a battery box for accommodating a battery cell group. The battery cell group includes a plurality of battery cells stacked along a stacking direction. The battery box includes a shell, at least one pressure cylinder unit and at least one transmission assembly. The at least one pressure cylinder unit includes a cylinder body and a movable rod. The cylinder body is disposed in the shell. The movable rod is movably disposed in the cylinder body along a movable direction. The at least one transmission assembly is used to connect the movable rod of the at least one pressure cylinder unit and the battery cell group. The movable rod is used to apply a driving force to the at least one transmission assembly, so that the movable rod can be pushed against the battery cell group through the at least one transmission assembly. The movable direction is not parallel to the stacking direction.

[0009] According to the battery box disclosed in the above embodiment, in the extrusion assembly, the bracket is connected to the frame and surrounded by the frame. Therefore, the pressure cylinder unit can evenly transmit force to the battery cell group through the extrusion assembly, so that the battery cell group has good electrical characteristics. Alternatively, since the movable direction of the movable rod is not parallel to the stacking direction of the battery cells, the space occupied by the pressure cylinder unit in the stacking direction is reduced, so that more battery cells can be arranged in the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a three-dimensional exploded view of a battery module according to Embodiment 1 of the present invention;

[0011] Figure 2 for Figure 1 A side cross-sectional schematic diagram of a battery module in FIG.

[0012] Figure 3 for Figure 1 A three-dimensional view of the battery module omitting the housing and circuit board assembly;

[0013] Figure 4 for Figure 1 A three-dimensional exploded view of the battery module omitting the housing and circuit board assembly;

[0014] Figure 5 is a three-dimensional exploded view of a battery module according to Embodiment 2 of the present invention;

[0015] Figure 6 for Figure 5 A side cross-sectional schematic diagram of a battery module in FIG.

[0016] Figure 7 for Figure 5 A three-dimensional view of the battery module omitting the housing and circuit board assembly;

[0017] Figure 8 is a three-dimensional exploded view of a battery module according to Embodiment 3 of the present invention;

[0018] Fig. 9 for Figure 8 A three-dimensional exploded view of the battery module omitting the housing and circuit board assembly;

[0019] Fig.10 FIG. 4 is a side cross-sectional diagram of a battery module according to Embodiment 4 of the present invention.

[0020] Wherein, the reference numerals are:

[0021] 10,10a,10b,10c:Battery module

[0022] 100: Shell

[0023] 110: first housing portion

[0024] 120: Second housing portion

[0025] 130: Accommodation space

[0026] 200: Battery pack

[0027] 210: Battery Cell

[0028] 300: Circuit board assembly

[0029] 400,400b: Extrusion components

[0030] 410:Extruded plate

[0031] 420,420b: Push plate

[0032] 421,421b:Framework

[0033] 422,422b: Bracket

[0034] 423: First bracket

[0035] 424: Second bracket

[0036] 425b: Ring bracket

[0037] 426b: Fixed convex part

[0038] 500,550: Transmission plate

[0039] 600: Mounting frame

[0040] 700,700a,700c: Cylinder unit

[0041] 710,710c: Cylinder

[0042] 720,720a:Active rod

[0043] 800: Transmission components

[0044] 810: Steering roller

[0045] 820: First transmission belt

[0046] 821: Fixed segment

[0047] 822: Pushed section

[0048] 823: Set section

[0049] 830: Second transmission belt

[0050] 831: First fixed section

[0051] 832: Second fixed segment

[0052] 833: Winding section

[0053] 834: Pre-roll segment

[0054] 840: Labor-saving roller

[0055] 900c: Pipeline

[0056] 20c: External container

[0057] S: stack direction

[0058] M,Ma: Activity direction

[0059] A: Axial direction

[0060] F: Driving force

[0061] P: extrusion direction. DETAILED DESCRIPTION

[0062] The technical content and detailed description of this application are described below with reference to the accompanying drawings:

[0063] See also Figure 1 and Figure 2 . Figure 1 FIG. 1 is a three-dimensional exploded view of a battery module according to Embodiment 1 of the present invention. Figure 2 for Figure 1 Schematic side view of the battery module.

[0064] In this embodiment, the battery module 10 is, for example, a lithium metal battery module, and includes a housing 100, a battery cell group 200, a circuit board assembly 300, two extrusion assemblies 400, two transmission plates 500, 550, two mounting frames 600, two pressure cylinder units 700, and two transmission assemblies 800. The housing 100, the two extrusion assemblies 400, the two transmission plates 500, 550, the two mounting frames 600, the two pressure cylinder units 700, and the two transmission assemblies 800 can together constitute a battery box. The battery box is used to accommodate the battery cell group 200, and together with the battery cell group 200, form a battery module.

[0065] In this embodiment, the housing 100 may include a first housing portion 110 and a second housing portion 120. The first housing portion 110 is stacked on one side of the second housing portion 120, and the first housing portion 110 and the second housing portion 120 together form a receiving space 130. The present invention is not limited to the form of the housing 100. In other embodiments, the housing may also be an integrated structure rather than including two housing portions stacked on each other.

[0066] The battery pack 200 includes a plurality of battery cells 210, which can be stacked along a stacking direction S and disposed in the accommodation space 130 of the housing 100. The circuit board assembly 300 is, for example, a battery management system (BMS). The circuit board assembly 300 is disposed in the accommodation space 130 of the housing 100 and is electrically connected to the battery cells 210.

[0067] See also Figures 2 to 4 . Figure 3 for Figure 1 A three-dimensional view of the battery module omitting the housing and circuit board assembly. Figure 4 for Figure 1 A three-dimensional exploded view of the battery module omitting the housing and circuit board assembly.

[0068] The two extrusion assemblies 400 are similar in structure, so the following mainly describes the detailed structure of one of the extrusion assemblies 400. The extrusion assembly 400 includes an extrusion plate 410 and a push plate 420. The extrusion plate 410 is stacked on one side of the battery cell group 200. The push plate 420 is stacked on the side of the extrusion plate 410 away from the battery cell group 200. In this embodiment, the push plate 420 includes a frame 421 and a plurality of brackets 422. The bracket 422 is connected to the frame 421 and surrounded by the frame 421. The cross-section of the bracket 422 can be square. In this embodiment, the push plate 420 is fixed to the extrusion plate 410 by bonding, for example, but it is not limited to this. In other embodiments, the push plate and the extrusion plate can also be integrally formed. In addition, in other embodiments, the cross-section of the bracket 422 can also be circular or any other shape that can make the pressure uniform.

[0069] In addition, if Figure 4 As shown, the bracket 422 includes a plurality of first brackets 423 and a plurality of second brackets 424. The first brackets 423 and the second brackets 424 are perpendicular to each other and connected to each other. The first brackets 423 and the second brackets 424 are connected to the frame 421 and surrounded by the frame 421. In other embodiments, the bracket may also include a first bracket and a second bracket, so that the first bracket and the second bracket are together in a cross shape.

[0070] In addition, if Figure 2 As shown, the two extrusion plates 410 of the two extrusion assemblies 400 are respectively stacked on opposite sides of the battery cell group 200. The two transmission plates 500, 550 are respectively against the side of the two push plates 420 away from the extrusion plates 410.

[0071] The two mounting frames 600 are located in the accommodating space 130 of the housing 100. The two mounting frames 600 are separated from each other and fixed to the housing 100. The transmission plate 550 abuts against the two mounting frames 600.

[0072] The two pressure cylinder units 700 and the two transmission assemblies 800 are respectively disposed on the two mounting frames 600, and the two pressure cylinder units 700 pull the transmission plates 500 through the two transmission assemblies 800, respectively, so that the two transmission plates 500 and 550 respectively drive the two extrusion assemblies 400 to push against the battery cell group 200. For the sake of simplicity, the following will mainly describe the detailed structure and connection relationship of a corresponding set of pressure cylinder units 700 and transmission assemblies 800.

[0073] The cylinder unit 700 is, for example, a pneumatic cylinder, and includes a cylinder body 710 and a movable rod 720. The cylinder body 710 is fixed to the mounting frame 600 and disposed in the housing 100. The movable rod 720 is movably disposed in the cylinder body 710 along a movable direction M. In this embodiment, the movable direction M is not parallel to the stacking direction S of the battery cells 210. Further, the movable direction M and the stacking direction S of the battery cells 210 are, for example, perpendicular to each other. The present invention is not limited to the form of the cylinder unit 700. In other embodiments, the cylinder unit may also be a hydraulic cylinder.

[0074] Since the activity direction M is not parallel to the stacking direction S of the battery cells 210, the space occupied by the cylinder unit 700 in the stacking direction S is reduced, so that more battery cells 210 can be arranged in the accommodating space 130 of the shell 100, thereby increasing the total power of the battery module 10; or, the volume of the battery box can be reduced without reducing the number of battery cells, thereby increasing the flexibility of using the battery box.

[0075] In addition, in this embodiment, the two cylinder units 700 are staggered with each other to more effectively utilize the accommodation space 130 of the housing 100 .

[0076] In this embodiment, the transmission assembly 800 includes a steering roller 810 , a first transmission belt 820 , a second transmission belt 830 and a labor-saving roller 840 .

[0077] The steering roller 810 is rotatably disposed on the mounting frame 600. The first transmission belt 820 is connected to the movable rod 720 and the steering roller 810. Specifically, the first transmission belt 820 includes a fixed section 821, a pushed section 822 and a sleeve section 823. The pushed section 822 connects the fixed section 821 and the sleeve section 823. The fixed section 821 is fixed to the housing 100. The sleeve section 823 is sleeved on the steering roller 810. The pushed section 822 is connected to the movable rod 720 and is used to be pushed by the movable rod 720. An axial direction A of the steering roller 810 is not parallel to the movable direction M and the stacking direction S. Further, as Figure 2 As shown, the axial direction A, the stacking direction S and the moving direction M are respectively parallel to the X-axis direction, the Y-axis direction and the Z-axis direction. That is, the axial direction A is perpendicular to the moving direction M and the stacking direction S, for example.

[0078] The second transmission belt 830 is separated from the first transmission belt 820 along the axial direction A of the steering roller 810. The second transmission belt 830 includes a first fixed section 831, a second fixed section 832 and a winding section 833. The winding section 833 connects the first fixed section 831 and the second fixed section 832. The first fixed section 831 is fixed to the steering roller 810. Figure 3 As shown, the second fixing section 832 is fixed to the transmission plate 500. Figure 3 In order to clearly present the fixing relationship between the second fixing section 832 and the transmission plate 500 , part of the mounting frame 600 is omitted.

[0079] In this embodiment, the second transmission belt 830 further includes a pre-winding section 834 . The pre-winding section 834 is connected to an end of the first fixing section 831 away from the winding section 833 and is wound around the steering roller 810 .

[0080] The labor-saving roller 840 is rotatably disposed on the mounting frame 600 and separated from the steering roller 810. The winding section 833 is wound around the labor-saving roller 840, so that the winding section 833 and the labor-saving roller 840 form a labor-saving structure similar to a movable pulley.

[0081] like Figure 3 and Figure 4 As shown, the two movable rods 720 of the second pressure cylinder unit 700 are respectively connected to the two first transmission belts 820 of the second transmission assembly 800. The two second fixed sections 832 of the two second transmission belts 830 are respectively fixed to the opposite sides of the transmission plate 500, so that the transmission plate 500 can evenly push against the pushed plate 420.

[0082] like Figures 2 to 4 As shown, the cylinder 710 is used to drive the movable rod 720 to extend from the cylinder 710, so that the movable rod 720 applies a driving force F to the pushed section 822 of the first transmission belt 820. The pushed pushed section 822 causes the sleeve section 823 to drive the steering roller 810 to rotate. The rotation of the steering roller 810 drives the first fixed section 831 of the second transmission belt 830 to move, so that the first fixed section 831 drives the second fixed section 832 to pull the transmission plate 500 along an extrusion direction P through the winding section 833. In this way, the transmission plate 500 pushes against the battery cell group 200 along the extrusion direction P through the extrusion assembly 400, thereby providing pressure to the battery cell group 200. When the battery pack 200 is charged and discharged and expands or contracts along the stacking direction S, the driving force F applied by the movable rod 720 to the pushed section 822 can be adjusted by adjusting the pressure applied by the cylinder 710 to the movable rod 720, so that the battery pack 200 can be subjected to a constant pressure.

[0083] In the pressing assembly 400, the bracket 422 is connected to the frame 421 and surrounded by the frame 421. Therefore, the cylinder unit 700 can evenly transfer the pressure to the battery cell group 200 through the pressing assembly 400, so that the battery cell group 200 has good electrical characteristics.

[0084] In addition, since the first fixed section 831 drives the second fixed section 832 through the winding section 833 wound around the labor-saving roller 840, the winding section 833 can pull the transmission plate 500 along the extrusion direction P through a mechanism similar to a movable pulley. In this way, fewer cylinder units 700 are required to provide the pressure required by the battery cell group 200, which reduces the space occupied by the cylinder unit 700 in the housing 100 and also reduces the overall weight of the battery module 10.

[0085] When the battery cell assembly 200 expands along the stacking direction S, the pre-reeling section 834 is released from the steering roller 810 so that the second transmission belt 830 can move along with the expansion of the battery cell assembly 200 .

[0086] The battery module 10 according to the present invention is not limited to a lithium metal battery module. In other embodiments, the battery module may also be any other type of battery module in which the battery cell group needs to be pressed. In addition, in other embodiments, the battery module may also include an extrusion component, a cylinder unit and a transmission component.

[0087] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. The description of the omitted parts can be referred to the previous embodiments, and the following embodiments will not be repeated.

[0088] The present invention is not limited to the relationship between the movable direction of the movable rod and the stacking direction of the battery cells. Figure 5 and Figure 6 . Figure 5 FIG. 1 is a three-dimensional exploded view of a battery module according to the second embodiment of the present invention. Figure 6 for Figure 5 Schematic side section of the battery module in the embodiment. The main difference between the battery module 10a of the present embodiment and the battery module 10 of the first embodiment lies in the movable direction Ma of the movable rod 720a of the cylinder unit 700a. In the present embodiment, the battery module 10a includes a shell 100, a battery cell group 200, a circuit board assembly 300, two extrusion assemblies 400, two mounting frames 600 and four cylinder units 700a. The shell 100, the two extrusion assemblies 400, the two mounting frames 600 and the two cylinder units 700a can together constitute a battery box. This battery box is used to accommodate the battery cell group 200 and form a battery module together with the battery cell group 200.

[0089] See also Figure 6 and Figure 7 . Figure 7 for Figure 5 The battery module in the embodiment omits the housing and the circuit board assembly. In the present embodiment, the movable direction Ma of the movable rod 720a of the pressure cylinder unit 700a is parallel to the stacking direction S of the battery cell 210. Therefore, in the present embodiment, the movable rod 720a of the pressure cylinder unit 700a directly contacts the push plate 420 of the pressing assembly 400. In this way, compared with the first embodiment, the battery module 10a of the present embodiment does not need to include the transmission plates 500, 550 and the transmission assembly 800, thereby simplifying the structural complexity of the battery module 10a to reduce the manufacturing cost of the battery module 10a.

[0090] The present invention is not limited to the structure of the push plate. Figure 8 and Fig. 9 . Figure 8 FIG. 1 is a three-dimensional exploded view of a battery module according to Embodiment 3 of the present invention. Fig. 9 for Figure 8 The battery module in the embodiment omits the three-dimensional exploded view of the housing and the circuit board assembly. The main difference between the battery module 10b of this embodiment and the battery module 10 of the first embodiment lies in the structure of the push plate 420b of the extrusion assembly 400b. In this embodiment, the push plate 420b includes a frame 421b, a plurality of brackets 422b and a plurality of annular brackets 425b. The cross-section of the brackets 422b and the annular brackets 425b can be square. The brackets 422b are used to connect the annular brackets 425b and the frame 421b. The frame 421b surrounds the brackets 422b and the annular brackets 425b. The annular brackets 425b are separated from each other. In addition, in this embodiment, the two opposite sides of the push plate 420b are respectively provided with two fixed protrusions 426b. The two second fixed sections 832 of the second second transmission belt 830 are respectively fixed to the two fixed protrusions 426b. In other words, this embodiment replaces the transmission plate 500 in the first embodiment with the fixed protrusions 426b as a structure for fixing the second fixed section 832. The housing 100 , the two extrusion assemblies 400 b , the two mounting frames 600 , the two cylinder units 700 and the two transmission assemblies 800 may together form a battery box for accommodating the battery cell group 200 and forming a battery module together with the battery cell group 200 .

[0091] The present invention is not limited to the manner in which the pressure cylinder unit receives pressure. Fig.10 , Fig.10: is a side cross-sectional schematic diagram of a battery module according to Embodiment 4 of the present invention. The main difference between the battery module 10c of this embodiment and the battery module 10 of Embodiment 1 is that the cylinder 710c of the cylinder unit 700c of this embodiment is connected to an external container 20c through a pipe 900c. In this way, since the volume and other configurations of the external container 20c are not restricted by the housing 100, the external container 20c can provide pressure to the cylinder 710c more flexibly and stably. In addition, the battery module 10c includes a housing 100, a battery cell group 200, a circuit board assembly 300, two extrusion assemblies 400, two transmission plates 500, 550, two mounting frames 600, two cylinder units 700c and two transmission assemblies 800. The housing 100, the two extrusion assemblies 400, the two transmission plates 500, 550, the two mounting frames 600, the two cylinder units 700c and the two transmission assemblies 800 can together constitute a battery box. The battery box is used to accommodate the battery cell group 200 and form a battery module together with the battery cell group 200.

[0092] According to the battery box disclosed in the above embodiment, in the extrusion assembly, the bracket is connected to the frame and surrounded by the frame. Therefore, the pressure cylinder unit can evenly transmit force to the battery cell group through the extrusion assembly, so that the battery cell group has good electrical characteristics. Alternatively, since the movable direction of the movable rod is not parallel to the stacking direction of the battery cells, the space occupied by the pressure cylinder unit in the stacking direction is reduced, so that more battery cells can be arranged in the housing.

[0093] The above is only a preferred embodiment of the present application, and should not limit the scope of implementation of the present application. That is, all equivalent changes and modifications made according to the present application should still fall within the scope of the patent coverage of the present application. The present application may also have other embodiments. Without departing from the spirit and essence of the present application, technicians familiar with the field can make various corresponding changes and deformations according to the present application, but these corresponding changes and deformations should fall within the scope of protection of the present application.

Claims

1. A battery box, characterized in that: To accommodate a battery pack and include: A housing for accommodating the battery pack; At least one extrusion assembly, comprising an extrusion plate and a push plate, wherein the extrusion plate is used to be stacked on one side of the battery cell group, and the push plate is used to be stacked on a side of the extrusion plate away from the battery cell group, and the push plate comprises a frame and a plurality of brackets, wherein the plurality of brackets are connected to the frame and surrounded by the frame; and A pressure cylinder unit is arranged in the housing and is used to push against the pushed plate.

2. The battery box according to claim 1, characterized in that: The plurality of brackets of the thrust plate include a plurality of first brackets and a plurality of second brackets, the plurality of first brackets and the plurality of second brackets are perpendicular to each other and connected to each other, and the plurality of first brackets and the plurality of second brackets are connected to the frame and surrounded by the frame.

3. The battery box according to claim 1, characterized in that: The push plate further includes a plurality of annular supports, which are separated from each other. The plurality of supports are used to connect the plurality of annular supports and the frame, and the frame surrounds the plurality of annular supports and the plurality of supports.

4. The battery box according to claim 1, characterized in that: The number of the at least one extrusion assembly is two, the two extrusion plates of the two extrusion assemblies are respectively used to be stacked on opposite sides of the battery cell group, and the pressure cylinder unit is used to push against the pushed plate of one of the extrusion assemblies.

5. The battery box according to claim 1, characterized in that: The cross-section of the multiple brackets is square.

6. A battery box for accommodating a battery pack, characterized in that: The battery cell group includes a plurality of battery cells stacked along a stacking direction, and the battery box includes: a housing; At least one cylinder unit, comprising a cylinder body and a movable rod, wherein the cylinder body is disposed in the housing, and the movable rod is movably disposed on the cylinder body along a movable direction; and At least one transmission assembly, used to connect the movable rod of the at least one cylinder unit and the battery cell group, the movable rod is used to apply a driving force to the at least one transmission assembly, so that the movable rod can be pushed against the battery cell group through the at least one transmission assembly; Wherein, the moving direction is not parallel to the stacking direction.

7. The battery case according to claim 6, characterized in that: It further includes an extrusion component, which is used to be stacked on one side of the battery cell group. The at least one transmission component includes a steering roller, a first transmission belt and a second transmission belt. The steering roller is rotatably arranged on the shell. The first transmission belt is connected to the movable rod and the steering roller. An axial direction of the steering roller is not parallel to the movable direction and the stacking direction. The second transmission belt is connected to the steering roller and the extrusion component, and is separated from the first transmission belt along the axial direction of the steering roller.

8. The battery case according to claim 7, characterized in that: The at least one transmission component further includes a labor-saving roller, which is rotatably disposed on the shell and separated from the steering roller. The second transmission belt includes a first fixed section, a second fixed section and a winding section. The winding section connects the first fixed section and the second fixed section. The first fixed section and the second fixed section are respectively connected to the steering roller and the extrusion component, and the winding section is wound around the labor-saving roller.

9. The battery case according to claim 8, characterized in that: The second transmission belt further comprises a pre-winding section, which is connected to an end of the first fixing section away from the winding section and is wound around the steering roller.

10. The battery case according to claim 8, characterized in that: The invention further comprises a transmission plate, wherein the transmission plate is used to abut against a side of the extrusion component away from the battery cell group, and the second fixing section is fixed to the transmission plate.

11. The battery case according to claim 10, characterized in that: The number of the at least one pressure cylinder unit and the at least one transmission assembly is two, the two movable rods of the two pressure cylinder units are respectively connected to the two transmission assemblies, and the two second fixed sections of the two second transmission belts are respectively fixed to the opposite sides of the transmission plate.

12. The battery case according to claim 11, characterized in that: The two cylinder units are offset from each other.

13. The battery case according to claim 8, characterized in that: The extrusion assembly includes an extrusion plate and a push plate, wherein the extrusion plate is used to be stacked on one side of the battery cell group, and the push plate is used to abut against the side of the extrusion plate away from the battery cell group. One side of the push plate has a fixed protrusion, and the second fixed section is fixed to the fixed protrusion.

14. The battery case according to claim 6, characterized in that: The at least one cylinder unit is a pneumatic cylinder.

15. The battery case according to claim 14, characterized in that: The cylinder body of the at least one cylinder unit is connected to an external container through a pipeline.

16. The battery case according to claim 6, characterized in that: The moving direction and the stacking direction are perpendicular to each other.

Images