A battery pack suitable for use in an electric vehicle

Abstract

This invention discloses a battery pack suitable for electric vehicles, belonging to the field of electric vehicle technology. It includes a first module, a second module, a liquid cooling plate, a cover plate, an electrical fixing plate, a sealing plate, fastening screws, and long bolts. The first and second modules are stacked vertically, with the liquid cooling plate positioned between them. A cover plate is disposed on the upper and lower surfaces of the battery pack, respectively. The cover plates are fixed to the first and second modules by fastening screws. The electrical fixing plate is fixed to the side walls of the liquid cooling plate and the two cover plates by fastening screws. The sealing plate is jointly fixed to the side walls of the first module, the second module, and the two cover plates by fastening screws. This invention integrates the battery pack's outer casing into the modules, and integrates the modules' electrical connections and data acquisition functions into the stack, achieving dimensional compression of the battery pack's sides and top and bottom, reducing the battery pack's volume while maintaining high structural strength.

Description

Technical Field

[0001] This invention relates to a battery pack suitable for electric vehicles, belonging to the field of electric vehicle technology. Background Technology

[0002] A typical battery pack consists of modules and a casing. This configuration is advantageous for high-capacity battery packs and is widely used. However, for low-capacity battery packs, the number of modules is small (e.g., only 1 to 2 modules), which significantly increases the volume occupied by the casing. Forcibly reducing the volume occupied by the casing would lead to design difficulties and inconvenient installation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a battery pack suitable for electric vehicles, which aims to solve the problems of large volume occupied by the outer shell of the box when the number of modules is small and the inconvenience of installation caused by forcibly reducing the volume occupied by the outer shell of the box.

[0004] The technical problem to be solved by this invention is achieved by the following technical solution:

[0005] A battery pack suitable for electric vehicles includes a first module, a second module, a liquid cooling plate, a cover plate, an electrical fixing plate, a sealing plate, fastening screws, and long bolts. The first module and the second module are stacked together. The liquid cooling plate is disposed between the first module and the second module. A cover plate is disposed on the upper surface and the lower surface of the battery pack, respectively. The cover plate is fixed to the first module and the second module by fastening screws. The electrical fixing plate is fixed to the side wall of the liquid cooling plate and the side wall of the two cover plates by fastening screws. The sealing plate is fixed to the side wall of the first module, the side wall of the second module, and the side wall of the two cover plates by fastening screws. The long bolts are threaded through the cover plate, the first module, the liquid cooling plate, the second module, and the cover plate from bottom to top. A gap is provided between the sealing plate and the electrical fixing plate for arranging electrical components, connectors, and wiring harnesses.

[0006] The first module is provided with a first stack and a second stack, and the second module is also provided with a first stack and a second stack, which are used to integrate the electrical connection of the first module and the second module, as well as the acquisition function, into the first stack on the first module, the first stack on the second module, the second stack on the first module, and the second stack on the second module, so as to achieve the size compression of the battery pack around the sides and the top and bottom sides, and reduce the volume of the battery pack.

[0007] As a preferred embodiment, a first thermal pad is provided between the lower surface of the liquid cooling plate and the first module, and a first thermal pad is also provided between the upper surface of the liquid cooling plate and the second module. A second thermal pad is also provided between the first thermal pad and the first module, and a second thermal pad is also provided between the first thermal pad and the second module.

[0008] As a preferred example, the first module further includes a battery cell, side plates, fastening screws, and fastening rivets. The first stack and the second stack are respectively installed on the top and bottom of the battery cell. There are three side plates, one of which is installed on one end of the battery cell, and the other two side plates are respectively installed on the two side walls of the battery cell. The two side plates form notches at the ends of the first stack and the second stack. The cover plates are fixed to the side plates of the first module and the second module by fastening screws. The sealing plates are jointly fixed to the notches formed at the ends of the two side plates on the first module, the notches formed at the ends of the two side plates on the second module, and the side walls of the two cover plates by fastening screws.

[0009] As a preferred embodiment, the battery cells in the first module are arranged in multiple rows, with adjacent cells arranged in a staggered or non-staggered manner on the first module; the battery cells are located between the first stack and the second stack, and both the first stack and the second stack are provided with conductive bars. The positive and negative terminals of the battery cells are respectively fitted with the apertures of the conductive bars and laser welded. Each of the first stack and the second stack corresponding to the position of each battery cell terminal is provided with a groove, and the bottom of the groove leaves a gap with the outer surface of the first stack or the second stack; the battery cells are welded to the first stack and the second stack and fixed to the side plate by fastening rivets, so as to realize the sequential transmission of force to the side plate.

[0010] As a preferred example, the edges of the first stack and the second stack are simultaneously fixed to the end faces of the three side plates by fastening rivets, and the adjacent side plates are fixed to each other by fastening screws.

[0011] As a preferred example, the first stack also includes a lower PET film, a PCBA board, a middle PET film, a support plate, and an upper PET film, which are arranged sequentially from bottom to top. The PCBA board and the conductive busbar are located on the same layer of the stack. The PCBA board has cutouts for the conductive busbar to be positioned at the cutouts. The inner surfaces of the lower and upper PET films and both sides of the middle PET film are coated with adhesive to solidify all the materials in the stack into one piece during the hot pressing process through heat deformation, stress shrinkage, and adhesive curing. The lower PET film has waist-shaped holes that correspond to the collection points on the conductive busbar and the PCBA board, respectively. The conductive busbar and the collection points on the PCBA board are electrically connected by welding.

[0012] As a preferred embodiment, the side plate of the first module is provided with a groove and a through hole leading to the adjacent end face of the side plate, the side plate of the second module is provided with a threaded hole, and the liquid cooling plate is provided with a clearance hole. The three axes of the through hole, the threaded hole and the clearance hole are collinear. The fastening screw, with the help of the clearance of the groove, passes through the through hole on the upper side plate of the first module and the clearance hole on the liquid cooling plate, and is locked in the threaded hole on the second module; this is used to fasten the first module and the second module together, and at the same time fix the liquid cooling plate.

[0013] As a preferred example, the long bolt passes through the first module, the liquid cooling plate, the second module, and the two cover plates, and fixes the first module and the second module by locking the two side plates.

[0014] As a preferred example, the battery pack includes, in addition to, attached Figure 1 In addition to the formed structure, it also includes an N-layer module assembly, which includes a third module assembly, ..., an Nth module assembly, where N > 3. The Nth module assembly includes an Nth module, a first thermal pad, a second thermal pad, a liquid cooling plate, a first thermal pad, and a second thermal pad. The bottom of the third module is located at the bottom of the attached... Figure 1 Above the second module, and between the third module and the second module, a first thermal pad, a second thermal pad, a liquid cooling plate, a first thermal pad, a second thermal pad, ... are sequentially arranged. The bottom of the Nth module is located above the (N-1)th module, and between the Nth module and the (N-1)th module, a first thermal pad, a second thermal pad, a liquid cooling plate, a first thermal pad, and a second thermal pad are also sequentially arranged.

[0015] A cover plate is provided on the upper and lower surfaces of the battery pack, respectively. The cover plates are fixed to the first module and the Nth module by fastening screws. The electrical fixing plate is fixed to the side wall of the liquid cooling plate and the side wall of the two cover plates by fastening screws. The sealing plate is fixed to the side wall of the first module, the side wall of the second module, ..., the side wall of the Nth module and the side wall of the two cover plates by fastening screws. The long bolts are threaded through the cover plate, the first module, the liquid cooling plate, the second module, the liquid cooling plate, the third module, ..., the liquid cooling plate, the Nth module and the cover plate in sequence from bottom to top. There is a gap between the sealing plate and the electrical fixing plate for arranging electrical components, connectors and wiring harnesses.

[0016] The beneficial effects of this invention are: This invention integrates the outer shell of the battery pack into the module, and integrates the electrical connection and data acquisition functions of the module into the stack, thereby achieving size compression of the battery pack's four sides and top and bottom sides, reducing the volume of the battery pack, while also having high structural strength. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery pack structure in this invention;

[0018] Figure 2 This is an exploded schematic diagram of the battery pack in this invention;

[0019] Figure 3 This is a schematic diagram of the battery pack structure after the sealing plate is removed according to the present invention;

[0020] Figure 4 This is a schematic diagram of the first stacked structure in this invention;

[0021] Figure 5 This is an exploded view of the first stack in this invention;

[0022] Figure 6 This is a partial structural diagram of the first stacked arrangement in this invention;

[0023] Figure 7 This is a schematic diagram of the structure of the first module in this invention;

[0024] Figure 8 This is an exploded view of the first module in this invention;

[0025] Figure 9 This is a partial schematic diagram of the cross-section of the battery pack in this invention;

[0026] Figure 10 This is a partial schematic diagram of the cross-section of the battery pack from another perspective in this invention;

[0027] Figure 11 This is a partial schematic diagram of the cross-section of the liquid cooling plate in this invention;

[0028] Figure 12This is a schematic diagram illustrating the stacking of three-layer modules in this invention.

[0029] In the diagram: First module 100, battery cell 110, first stack 120, PET film 121, PCBA board 122, conductive busbar 123, middle PET film 124, support plate 125, upper PET film 126, groove 127, sampling point 128, second stack 130, side plate 140, groove 141, fastening rivet 150, second module 200, liquid cooling plate 300, clearance hole 310, first thermal pad 400, second thermal pad 500, cover plate 600, electrical fixing plate 700, sealing plate 800, fastening screw 900, long bolt 1000. Detailed Implementation

[0030] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific illustrations.

[0031] like Figure 1-12 As shown, a battery pack suitable for electric vehicles includes a first module 100, a second module 200, a liquid cooling plate 300, a cover plate 600, an electrical fixing plate 700, a sealing plate 800, fastening screws 900, and long bolts 1000. The first module 100 and the second module 200 are stacked together, and the liquid cooling plate 300 is disposed between the first module 100 and the second module 200. A cover plate 600 is disposed on the upper surface and the lower surface of the battery pack, respectively. The cover plates 600 are fixed to the first module 100 and the second module 200 by fastening screws 900. On the 0, the electrical fixing plate 700 is fixed to the side wall of the liquid cooling plate 300 and the side wall of the two cover plates 600 by fastening screws 900. The sealing plate 800 is fixed to the side wall of the first module 100, the side wall of the second module 200 and the side wall of the two cover plates 600 by fastening screws 900. The long bolt 1000 passes through the cover plate 600, the first module 100, the liquid cooling plate 300, the second module 200 and the cover plate 600 in sequence from bottom to top. There is a gap between the sealing plate 800 and the electrical fixing plate 700 for arranging electrical components, connecting strips and wire harnesses.

[0032] The first module 100 is provided with a first stack 120 and a second stack 130 respectively, and the second module 200 is also provided with a first stack 120 and a second stack 130 respectively. This is used to integrate the electrical connection of the first module 100 and the second module 200, as well as the data acquisition function, onto the first stack 120 on the first module 100, the first stack 120 on the second module 200, the second stack 130 on the first module 100, and the second stack 130 on the second module 200, thereby compressing the size of the battery pack around its sides and on its top and bottom sides, and reducing the volume of the battery pack.

[0033] A first thermal pad 400 is provided between the lower surface of the liquid cooling plate 300 and the first module 100, and a first thermal pad 400 is also provided between the upper surface of the liquid cooling plate 300 and the second module 200. A second thermal pad 500 is also provided between the first thermal pad 400 and the first module 100, and a second thermal pad 500 is also provided between the first thermal pad 400 and the second module 200.

[0034] It should be noted that the purpose of setting up the first thermal pad 400 and the second thermal pad 500 is to enable better heat transfer.

[0035] Furthermore, the battery module has the following two heat transfer routes:

[0036] 1. The outer casing of the battery cell 110 → the terminal post on the battery cell 110 → the conductive bus 123 → the second thermal pad 500 → the first thermal pad 400 → the liquid cooling plate 300 → the coolant;

[0037] 2. Outer casing on cell 110 → Terminal post on cell 110 → Conductive busbar 123 → Middle PET film 124 → Support plate 125 → Upper PET film 126 → First thermal pad 400 → Liquid cooling plate 300 → Coolant.

[0038] It should be noted that the internal structure of the second module 200 is exactly the same as that of the first module 100. Therefore, the internal structure of the first module 100 will be described below, mainly as follows:

[0039] The first module 100 also includes a battery cell 110, a side plate 140, fastening screws 900 and fastening rivets 150150. The first stack 120 and the second stack 130 are respectively installed on the top and bottom of the battery cell 110. There are three side plates 140, one of which is installed on one end of the battery cell 110, and the other two side plates 140 are respectively installed on the two side walls of the battery cell 110. The two side plates 140 form notches at the ends of the first stack 120 and the second stack 130. The cover plate 600 is fixed to the side plate 140 of the first module 100 and the side plate 140 of the second module 200 by fastening screws 900. The sealing plate 800 is fixed together to the notches formed at the ends of the two side plates 140 on the first module 100, the notches formed at the ends of the two side plates 140 on the second module 200, and the side walls of the two cover plates 600 by fastening screws 900.

[0040] The battery cells 110 in the first module 100 are arranged in multiple rows, with adjacent battery cells 110 arranged in a staggered or non-staggered manner on the first module 100; the battery cells 110 are located between the first stack 120 and the second stack 130, and both the first stack 120 and the second stack 130 are provided with conductive bars 123. The positive and negative terminals of the battery cells 110 are respectively fitted with the aperture of the conductive bars 123 and laser welded. The first stack 120 and the second stack 130 corresponding to the terminal position of each battery cell 110 are provided with a groove 127, and the bottom of the groove 127 leaves a gap with the outer surface of the first stack 120 or the second stack 130;

[0041] The battery cell 110 is welded to the first stack 120 and the second stack 130 and fixed to the side plate 140 by fastening rivets 150, so as to realize the sequential transmission of force to the side plate 140.

[0042] The edges of the first stack 120 and the second stack 130 are simultaneously fixed to the end faces of the three side plates 140 by fastening rivets 150, and the adjacent side plates 140 are fixed to each other by fastening screws 900.

[0043] It should be noted that the internal structure of the second stack 130 is exactly the same as that of the first stack 120. Therefore, the internal structure of the first stack 120 will be described below, mainly as follows:

[0044] The first stack 120 also includes a lower PET film 121, a PCBA board 122, a middle PET film 124, a support plate 125, and an upper PET film 126. The lower PET film 121, the middle PET film 124, the support plate 125, and the upper PET film 126 are arranged sequentially from bottom to top. The PCBA board 122 and the conductive busbar 123 are located on the same layer of the stack 120. The PCBA board 122 has a cutout for the conductive busbar 123 to be cut out and positioned at the cutout. The inner surfaces of the lower PET film 121 and the upper PET film 126 are also included. Both sides of the middle PET film 124 are coated with adhesive. During the hot pressing process, the lower PET film 121, the middle PET film 124 and the upper PET film 126 are solidified into one piece by heat deformation, stress shrinkage and adhesive curing. The lower PET film 121 has waist-shaped holes, which correspond to the collection points 128 on the conductive busbar 123 and the PCBA board 122, respectively. The conductive busbar 123 and the collection points 128 on the PCBA board 122 are electrically connected by welding.

[0045] It should be noted that after the adhesive (using epoxy resin) cures all the materials in the first stack 120 into one piece (and all the materials in the second stack 130 are also cured into one piece by the above method), the PET film has high insulation performance and structural strength, achieving insulation between the conductive busbar 123, PCBA board 122 and support plate 125, external insulation of the conductive busbar 123, PCBA board 122 and support plate 125, and the structural strength of the first stack 200 as a whole.

[0046] It should be noted that the conductive bus 123 is electrically connected to the acquisition point 128 on the PCBA board 122 by welding (e.g., aluminum wire (129) welding or laser welding), see Figure 6 The acquisition function of PCBA board 122 can also be replaced by an acquisition harness.

[0047] The first module 100 has a groove 141 on its side plate 140 and a through hole on the side plate 140 leading to the adjacent end face. The second module 200 has a threaded hole on its side plate 140 and a clearance hole 310 on its liquid cooling plate 300. The three axes of the through hole, the threaded hole, and the clearance hole 310 are collinear. The fastening screw 900 passes through the through hole on the side plate 140 of the first module 100 and the clearance hole 310 on the liquid cooling plate 300 with the help of the clearance in the groove 141, and is locked in the threaded hole on the second module 200. This is used to fasten the first module 100 and the second module 200 together, and also to fix the liquid cooling plate 300.

[0048] Long bolts 1000 pass through the first module 100, liquid cooling plate 300, second module 200 and two cover plates 600, and the first module 100 and second module 200 are fixed by locking the two side plates 140.

[0049] As another embodiment, such as Figure 12 As shown, in addition to stacking two battery modules together, the battery pack solution can also stack three or more modules together. The liquid cooling plate 300 and the matching first thermal pad 400 and second thermal pad 500 in the battery pack assembly solution are replaced with insulating material (insulating sheet) and cooled naturally (e.g., by airflow), as detailed below:

[0050] The battery pack includes, in addition to, the attached Figure 1 In addition to the formed structure, it also includes N layers of module combinations, which include a third module combination, ..., an Nth module combination, where N > 3. The Nth module combination includes the Nth module, a first thermal pad 400, a second thermal pad 500, a liquid cooling plate 300, a first thermal pad 400, and a second thermal pad 500. The bottom of the third module is located at... Figure 1Above the second module 200, and between the third module and the second module 200, a first thermal pad 400, a second thermal pad 500, a liquid cooling plate 300, a first thermal pad 400, a second thermal pad 500, ... are arranged in sequence. The bottom of the Nth module is located above the (N-1)th module, and between the Nth module and the (N-1)th module, a first thermal pad 400, a second thermal pad 500, a liquid cooling plate 300, a first thermal pad 400, and a second thermal pad 500 are also arranged in sequence.

[0051] A cover plate 600 is provided on the upper and lower surfaces of the battery pack. The cover plate 600 is fixed to the first module 100 and the Nth module by fastening screws 900. The electrical fixing plate 700 is fixed to the side wall of the liquid cooling plate 300 and the side wall of the two cover plates 600 by fastening screws 900. The sealing plate 800 is fixed to the side wall of the first module 100, the side wall of the second module 200, ..., the side wall of the Nth module and the side wall of the two cover plates 600 by fastening screws 900. The long bolt 1000 passes through the cover plate 600, the first module 100, the liquid cooling plate 300, the second module 200, the liquid cooling plate 300, the third module ... the liquid cooling plate 300, the Nth module and the cover plate 600 in sequence from bottom to top. There is a gap between the sealing plate 800 and the electrical fixing plate 700 for arranging electrical components, connectors and wiring harnesses.

[0052] This invention integrates the battery pack's outer casing onto the modules (first module 100 and second module 200), and integrates the electrical connection and data acquisition functions of the modules (first module 100 and second module 200) onto the stacks (first stack 120 and second stack 130), thereby achieving dimensional compression of the battery pack's four sides and top and bottom sides, reducing the battery pack's volume, while also maintaining high structural strength.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention, all of which fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack suitable for electric vehicles, characterized in that: The battery pack includes a first module, a second module, a liquid cooling plate, a cover plate, an electrical fixing plate, a sealing plate, fastening screws, and long bolts. The first module and the second module are stacked together. The liquid cooling plate is disposed between the first module and the second module. A cover plate is disposed on the upper surface and the lower surface of the battery pack, respectively. The cover plates are fixed to the first module and the second module by fastening screws. The electrical fixing plate is fixed to the side wall of the liquid cooling plate and the side wall of the two cover plates by fastening screws. The sealing plate is fixed to the side wall of the first module, the side wall of the second module, and the side wall of the two cover plates by fastening screws. The long bolts are threaded through the cover plate, the first module, the liquid cooling plate, the second module, and the cover plate from bottom to top. There is a gap between the sealing plate and the electrical fixing plate for arranging electrical components, connectors, and wiring harnesses. The first module is provided with a first stack and a second stack, and the second module is also provided with a first stack and a second stack, which are used to integrate the electrical connection of the first module and the second module, as well as the acquisition function, into the first stack on the first module, the first stack on the second module, the second stack on the first module, and the second stack on the second module, so as to achieve the size compression of the battery pack around the sides and the top and bottom sides, and reduce the volume of the battery pack; The first module also includes a battery cell, side plates, fastening screws, and fastening rivets. The first stack and the second stack are respectively installed on the top and bottom of the battery cell. There are three side plates, one of which is installed on one end of the battery cell, and the other two side plates are respectively installed on the two side walls of the battery cell. The two side plates form notches at the ends of the first stack and the second stack. The cover plates are fixed to the side plates of the first module and the second module by fastening screws. The sealing plates are jointly fixed to the notches formed at the ends of the two side plates on the first module, the notches formed at the ends of the two side plates on the second module, and the side walls of the two cover plates by fastening screws.

2. A battery pack suitable for electric vehicles according to claim 1, characterized in that: A first thermal pad is provided between the lower surface of the liquid cooling plate and the first module, and a first thermal pad is also provided between the upper surface of the liquid cooling plate and the second module. A second thermal pad is also provided between the first thermal pad and the first module, and a second thermal pad is also provided between the first thermal pad and the second module.

3. A battery pack suitable for electric vehicles according to claim 1, characterized in that: The battery cells in the first module are arranged in multiple rows, with adjacent cells arranged in a staggered or non-staggered manner on the first module; the battery cells are located between the first stack and the second stack, and both the first stack and the second stack are provided with conductive bars. The positive and negative terminals of the battery cells are respectively fitted with the apertures of the conductive bars and laser welded. Each battery cell terminal position is provided with a groove in the first stack and the second stack, and the bottom of the groove is left with a gap between the bottom of the groove and the outer surface of the first stack or the second stack. The battery cells are welded to the first and second stacks and fixed to the side plates by fastening rivets, so as to realize the sequential transmission of force to the side plates.

4. A battery pack suitable for electric vehicles according to claim 3, characterized in that: The edges of the first stack and the second stack are simultaneously fixed to the end faces of the three side plates by fastening rivets, and the adjacent side plates are fixed to each other by fastening screws.

5. A battery pack suitable for electric vehicles according to claim 3, characterized in that: The first stack also includes a lower PET film, a PCBA board, a middle PET film, a support plate, and an upper PET film, which are arranged sequentially from bottom to top. The PCBA board and the conductive busbar are located on the same layer of the stack. The PCBA board has cutouts for the conductive busbar to be positioned within the cutouts. The inner surfaces of the lower and upper PET films and both sides of the middle PET film are coated with adhesive. During the thermoforming process, the lower, middle, and upper PET films are deformed by heat, shrinked under stress, and the adhesive is cured to solidify all the materials in the stack into one piece. The lower PET film has waist-shaped holes that correspond to the collection points on the conductive busbar and the PCBA board, respectively. The conductive busbar and the collection points on the PCBA board are electrically connected by welding.

6. A battery pack suitable for electric vehicles according to claim 1, characterized in that: The first module has a groove on its side plate and a through hole on the side plate leading to the adjacent end face. The second module has a threaded hole on its side plate. The liquid cooling plate has a clearance hole. The three axes of the through hole, the threaded hole, and the clearance hole are collinear. The fastening screw passes through the through hole on the upper side plate of the first module and the clearance hole on the liquid cooling plate with the help of the groove clearance, and is locked in the threaded hole on the second module. This is used to fasten the first module and the second module together, and also to fix the liquid cooling plate.

7. A battery pack suitable for electric vehicles according to claim 1, characterized in that: The long bolt passes through the first module, the liquid cooling plate, the second module, and the two cover plates, and fixes the first module and the second module by locking the two side plates.

8. A battery pack suitable for electric vehicles, characterized in that: In addition to the structure of claim 1, the battery pack also includes an N-layer module assembly, which includes a third module assembly, ..., an Nth module assembly, where N > 3. The Nth module assembly includes an Nth module, a first thermal pad, a second thermal pad, a liquid cooling plate, a first thermal pad, and a second thermal pad. The bottom of the third module is located above the second module as described in claim 1, and the first thermal pad, the second thermal pad, the liquid cooling plate, the first thermal pad, and the second thermal pad are sequentially arranged between the third module and the second module. The bottom of the Nth module is located above the (N-1)th module, and the first thermal pad, the second thermal pad, the liquid cooling plate, the first thermal pad, and the second thermal pad are also sequentially arranged between the Nth module and the (N-1)th module. A cover plate is provided on the upper and lower surfaces of the battery pack, respectively. The cover plates are fixed to the first module and the Nth module by fastening screws. The electrical fixing plate is fixed to the side wall of the liquid cooling plate and the side wall of the two cover plates by fastening screws. The sealing plate is fixed to the side wall of the first module, the side wall of the second module, ..., the side wall of the Nth module and the side wall of the two cover plates by fastening screws. The long bolts are threaded through the cover plate, the first module, the liquid cooling plate, the second module, the liquid cooling plate, the third module, ..., the liquid cooling plate, the Nth module and the cover plate in sequence from bottom to top. There is a gap between the sealing plate and the electrical fixing plate for arranging electrical components, connectors and wiring harnesses.

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