A new energy vehicle battery heat exchange system

Abstract

The present invention provides a new energy vehicle battery heat exchange system, comprising: a battery module, comprising a plurality of battery cells; a heat exchange device, comprising a bottom plate, a frame, and a top plate with a hollow interior, a liquid inlet being provided on one side of the bottom plate, a liquid outlet being provided on one side of the top plate, a plurality of connecting parts being evenly distributed on the top plate and the bottom plate, the interiors of the bottom plate, the frame, and the top plate being connected via the plurality of connecting parts, a plurality of accommodating spaces being provided in the frame, and a plurality of battery cells being respectively plugged into the plurality of accommodating spaces; a protective box, for carrying the heat exchange device, an air cooling channel being provided between the top wall and two side walls in the longitudinal direction of the protective box and the outer wall of the heat exchange device, and an air inlet and an exhaust port being provided on opposite sides of the protective box. The present invention provides multiple accommodating spaces to uniformly dissipate heat from each battery cell. When an individual battery cell exhibits an abnormality, the accommodating spaces are used to isolate the heat exchanger from damage to other battery cells. The air cooling channels are provided to improve the heat exchange effect of the heat exchange device on each battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of battery heat dissipation, and in particular to a battery heat exchange system for a new energy vehicle. Background Art

[0002] As people's environmental awareness gradually increases, the popularity of electric vehicles is increasing. During the use of batteries, a large amount of heat is generated, which needs to be cooled. At this time, the heat emitted by the battery needs to be transferred to the outside through heat exchange to protect the battery and ensure the normal and stable operation of the equipment. Currently, coolant is usually used to remove the heat generated by the battery to achieve the purpose of dissipating heat for the battery. However, most of them only exchange heat on the bottom and side walls of the battery pack, and the heat exchange effect is poor. In addition, the cooling effect of the coolant on the battery swap at different positions on its flow path is different, which affects the service life of the battery swap. Summary of the Invention

[0003] The main purpose of the present invention is to provide a new energy vehicle battery heat exchange system to solve the problems in the prior art such as poor battery heat exchange effect and different cooling effects of the coolant on the battery replacement batteries at different positions on its flow path, which affects the service life of the battery replacement batteries.

[0004] In order to solve the above problems, the present invention adopts the following technical solution: a new energy vehicle battery heat exchange system, comprising: a battery module, comprising a plurality of battery cells; a heat exchange device, comprising an internally hollow bottom plate, a frame and a top plate, a liquid inlet being provided on one side of the bottom plate, a liquid outlet being provided on one side of the top plate, a plurality of connecting parts being respectively distributed on the top plate and the bottom plate, the interiors of the bottom plate, the frame and the top plate being connected through the plurality of connecting parts, a plurality of accommodating spaces being provided in the frame, and the plurality of battery cells being respectively plugged into the plurality of accommodating spaces; a protective box, for carrying the heat exchange device, an air cooling channel being provided between the top wall and the two side walls in the longitudinal direction of the protective box and the outer wall of the heat exchange device, and an air inlet and an exhaust port being respectively provided on opposite sides of the protective box.

[0005] Furthermore, the frame body includes a rectangular frame that passes through from top to bottom, and a plurality of transverse partitions and a plurality of longitudinal partitions fixed in the rectangular frame. The plurality of transverse partitions and the plurality of longitudinal partitions divide the interior of the rectangular frame into a plurality of accommodating spaces. The plurality of transverse partitions, the plurality of longitudinal partitions and the interior of the rectangular frame are all hollow structures and are interconnected. The top and bottom ends of the frame body are respectively provided with a plurality of through holes connected to the interior thereof for receiving a plurality of connecting parts.

[0006] Furthermore, the connecting portion includes a sleeve, one end of the sleeve is located inside the bottom plate or the top plate, the other end of the sleeve extends to the inside of the frame, and a non-return assembly is provided at one end of the sleeve close to the frame.

[0007] Furthermore, a valve chamber is provided inside the sleeve near one end of the frame, and the diameter of the valve chamber is larger than the inner diameter of the sleeve, so that a step is formed between the valve chamber and the inner wall of the sleeve, and the side wall of the valve chamber is provided with multiple openings connected to the outside world. The non-return assembly includes a sphere slidably arranged in the valve chamber and an elastic part for pushing the sphere to move toward the step, and the diameter of the sphere is larger than the inner diameter of the sleeve.

[0008] Furthermore, the elastic part is a compression spring.

[0009] Furthermore, one end of the sleeve close to the frame is detachably connected to a cover plate, and both ends of the compression spring are respectively in contact with the cover plate and the sphere.

[0010] Furthermore, the top ends of the plurality of battery cells are each provided with a safety valve, the top plate is provided with a plurality of ventilation holes which pass through from top to bottom, and the bottom ends of the plurality of ventilation holes are respectively covered above the plurality of safety valves.

[0011] Furthermore, blocks are fixed at the four corners inside the protective box, and the opposing surfaces of the two blocks on both sides of the length direction of the protective box are inner sides. The two sides of the length direction of the heat exchange device are respectively in contact with the corresponding inner sides of the blocks, so that a cross-shaped air cooling channel is formed between the interior of the protective box and the heat exchange device.

[0012] Furthermore, a plurality of grooves are provided on the top surface of the bottom plate, and the plurality of grooves are adapted to the bottoms of the plurality of battery cells and are used to support and cover the bottoms of the plurality of battery cells.

[0013] Furthermore, a plurality of grooves are provided on the bottom surface of the top plate, and the plurality of grooves are adapted to the tops of the plurality of battery cells and are used to support and cover the tops of the plurality of battery cells.

[0014] The beneficial effects of the present invention are:

[0015] By providing multiple accommodating spaces, heat can be evenly distributed across the battery cells, improving heat dissipation efficiency compared to existing technologies. Furthermore, when an individual battery cell experiences an abnormality, the isolation of the accommodating spaces prevents damage to other cells. By providing air cooling channels, heat can be dissipated from the heat exchange device, improving the heat exchange effect of the heat exchange device on each battery cell. Furthermore, when an individual battery cell experiences an abnormality, the smoke generated by the cell can be quickly discharged through the air cooling channels, preventing it from affecting other cells and causing further damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a three-dimensional diagram of the new energy vehicle battery heat exchange system of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the new energy vehicle battery heat exchange system of the present invention;

[0019] Figure 3 is a perspective view of a heat exchange device according to the present invention;

[0020] Figure 4 This is a schematic diagram of the installation structure of the battery module of the present invention;

[0021] Figure 5 Schematic diagram of the exploded structure of the heat exchange assembly of the present invention;

[0022] Figure 6 This is a schematic diagram of the internal structure of the frame of the present invention;

[0023] Figure 7 Schematic diagram of the bottom structure of the top plate;

[0024] Figure 8 is a cross-sectional view of a heat exchange assembly of the present invention;

[0025] Figure 9 for Figure 8 A magnified view of part A;

[0026] Figure 10 It is a structural schematic diagram of the air cooling channel of the present invention.

[0027] Description of Reference Numerals

[0028] 1. Battery module; 11. Battery cell; 111. Safety valve; 2. Heat exchange device; 21. Bottom plate; 211. Liquid inlet; 212. Groove; 22. Frame; 221. Rectangular frame; 222. Horizontal partition; 223. Vertical partition; 224. Accommodation space; 225. Through hole; 23. Top plate; 231. Liquid outlet; 232. Ventilation port; 24. Connecting part; 241. Sleeve; 2411. Valve chamber; 2412. Step; 2413. Opening; 242. Check assembly; 2421. Sphere; 2422. Elastic part; 243. Cover; 3. Protective box; 31. Air inlet; 32. Exhaust port; 33. Block; 331. Inner side; 4. Air-cooling channel. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] See also Figures 1 to 4 As shown, a new energy vehicle battery heat exchange system includes a battery module 1, a heat exchange device 2 and a protective box 3, wherein the battery module 1 includes multiple battery cells 11 connected in parallel or series to power the electric vehicle. The battery cells 11 are conventional and can be square lithium iron phosphate battery cells 11 with a length between 100 and 200 mm and a width and height between 60 and 100 mm. The details are not repeated here. Figure 4 As shown, the heat exchange device 2 is used to receive multiple battery cells 11, that is, multiple battery cells 11 are arranged inside the heat exchange device 2 so that the heat exchange device 2 can evenly dissipate heat for the multiple battery cells 11. Figure 2 and Figure 10 As shown, the protective box 3 is used to carry the heat exchange device 2, that is, the heat exchange device 2 is placed in the protective box 3, and a gap is provided between the top wall and the two side walls in the longitudinal direction of the protective box 3 and the outer wall of the heat exchange device 2, and the gap forms an air cooling channel 4. The protective box 3 is provided with an air inlet 31 and an exhaust port 32 on opposite sides, respectively, for air cooling and dissipating heat for the heat exchange device 2, thereby further exchanging heat with the battery module 1. In other words, by arranging the protective box 3 outside the heat exchange device 2, the heat exchange device 2 can be protected while also being air cooled and dissipated.

[0031] Please continue reading Figure 2 and Figure 10 As shown, in this embodiment, blocks 33 are fixed at the four corners of the interior of the protective box 3. The opposing surfaces of the two blocks 33 on both sides of the length direction of the protective box 3 are inner side surfaces 331. The two sides of the length direction of the heat exchange device 2 are respectively in contact with the inner side surfaces 331 of the corresponding blocks 33, so that a cross-shaped air cooling channel 4 is formed between the interior of the protective box 3 and the heat exchange device 2. It should be noted that the air inlet 31 and the exhaust port 32 of the protective box 3 are connected to the outside world, and are used to remove the heat in the protective box 3 through natural wind from the outside, or by using a fan in the existing technology. That is, the natural wind from the outside is blown into the protective box 3 from the air inlet 31 by the fan, and then the heat in the heat exchange device 2 is removed through the exhaust port 32.

[0032] See 3 and Figure 5As shown, in this embodiment, the heat exchange device 2 includes a bottom plate 21, a frame 22, and a top plate 23 fixed in sequence from bottom to top. The interiors of the bottom plate 21, the frame 22, and the top plate 23 are all hollow structures for accommodating coolant. Specifically, a liquid inlet 211 is provided on one side of the bottom plate 21, and a liquid outlet 231 is provided on one side of the top plate 23. A plurality of connecting portions 24 are evenly distributed on the top plate 23 and the bottom plate 21, respectively. The interiors of the bottom plate 21, the frame 22, and the top plate 23 are connected through the plurality of connecting portions 24. In this way, the coolant can enter from the liquid inlet 211 of the bottom plate 21, pass through the interiors of the bottom plate 21, the frame 22, and the top plate 23 in sequence, and then flow out from the liquid outlet 231 to take away the heat of the battery cell 11. It should be noted that the coolant can be liquid water or refrigerant in the existing technology, and can be connected to the vehicle's air-conditioning system. After the coolant exchanges heat with the battery cell 11, the coolant can be cooled by the vehicle's heat dissipation, which will not be elaborated here.

[0033] See also Figure 5 and Figure 6 As shown, in this embodiment, a plurality of accommodating spaces 224 are provided in the frame body 22, and a plurality of battery cells 11 are respectively inserted into the plurality of accommodating spaces 224. Specifically, the frame body 22 includes a rectangular frame 221 that passes through from top to bottom, a plurality of transverse partitions 222 and a plurality of longitudinal partitions 223 fixed in the rectangular frame 221, and the plurality of transverse partitions 222 and the plurality of longitudinal partitions 223 divide the interior of the rectangular frame 221 into a plurality of accommodating spaces 224. The plurality of transverse partitions 222, the plurality of longitudinal partitions 223 and the interior of the rectangular frame 221 are all hollow structures and are interconnected. The top and bottom ends of the frame body 22 are respectively provided with a plurality of through holes 225 connected thereto for receiving a plurality of connecting parts 24, that is, one end of the connecting part 24 is inserted into the corresponding through hole 225 to realize the internal connection of the bottom plate 21, the wide body and the top plate 23.

[0034] It should be noted that, by providing a frame 22, multiple battery cells 11 are respectively located in multiple accommodating spaces 224, so as to achieve the purpose of uniform heat dissipation of each battery cell 11. At the same time, through the covering of multiple transverse partitions 222, multiple longitudinal partitions 223, the top plate 23, and the bottom plate 21, heat can be exchanged on each side wall of the battery cell 11. Compared with the heat exchange system in the prior art (which only dissipates heat to the bottom and side walls of the battery pack), the heat dissipation effect is greatly improved, thereby reducing the situation where a battery cell 11 in the battery module 1 is overheated, causing damage to the battery cell 11 or affecting the life of the battery module 1.

[0035] See also Figure 5 and Figure 7As shown, preferably, the top surface of the bottom plate 21 and the bottom surface of the top plate 23 are provided with a plurality of grooves 212, which are respectively adapted to the bottom and top of the plurality of battery cells 11, and are used to carry and cover the plurality of battery cells 11, so that each battery cell 11 is fixed in each accommodating space 224, preventing the battery cell 11 from shaking while increasing the closeness between the battery cell 11 and the heat exchange device 2, thereby improving the heat dissipation effect.

[0036] See also Figure 4 and Figure 10 As shown, in this embodiment, a safety valve 111 is provided at the top of each of the multiple battery cells 11. A plurality of vents 232 are provided on the top plate 23, extending vertically therethrough. The bottom ends of the vents 232 are respectively positioned above the safety valves 111, while the top ends of the vents 232 communicate with the top end of the cross-shaped air cooling channel 4. It should be noted that the safety valves 111 of the battery cells 11 are conventional. When the pressure inside the battery rises to a certain level due to various reasons (such as overcharge, over-discharge, short circuit, or external high temperature), the safety valve 111 automatically opens to release the accumulated gas inside the battery, thereby reducing the internal pressure and preventing the battery from expanding, deforming, or even exploding due to excessive pressure. By providing multiple vents 232 positioned above the safety valves 111, when a battery abnormality occurs, the safety valve 111 automatically opens to discharge the internal gas, which is promptly discharged through the air cooling channel 4, preventing the overheated gas from damaging the entire battery module 1 or even causing a fire. In addition, when the battery cell 11 is overheated or about to catch fire, smoke may come out of the safety valve 111. At this time, the smoke is discharged to the outside through the air cooling channel 4 in time to avoid affecting other battery cells 11, and at the same time can remind the driver that there is a battery failure.

[0037] See also Figure 8 and Figure 9As shown, in this embodiment, the connecting portion 24 includes a sleeve 241, one end of which is located inside the bottom plate 21 or the top plate 23. In other words, one end of the sleeve 241 of the connecting portion 24 of the bottom plate 21 is located inside the bottom plate 21, while the sleeve 241 of the connecting portion 24 of the top plate 23 is located inside the top plate 23, and the other end extends to the interior of the frame 22, thereby allowing the interiors of the bottom plate 21, the frame 22 and the top plate 23 to be connected to each other. A non-return assembly 242 is provided at one end of the sleeve 241 close to the frame 22. Specifically, a valve chamber 241 is provided at one end of the interior of the sleeve 241 close to the frame 22. The diameter of the valve chamber 2411 is larger than the inner diameter of the sleeve 241, so that a step 2412 is formed between the valve chamber 2411 and the inner wall of the sleeve 241. The side wall of the valve chamber 2411 is provided with a plurality of openings 2413 communicating with the outside world. The non-return assembly 242 includes a sphere 2421 slidably arranged in the valve chamber 2411 and an elastic part 2422 for pushing the sphere 2421 to move toward the direction close to the step 2412. Preferably, the elastic part 2422 is a compression spring, and the diameter of the sphere 2421 is larger than the inner diameter of the sleeve 241.

[0038] Preferably, see Figure 9 As shown, the end of the sleeve 241 close to the frame 22 is detachably connected to a cover plate 243, and the two ends of the compression spring are respectively in contact with the cover plate 243 and the ball 2421. The cover plate 243 is provided to facilitate the installation of the compression spring and facilitate subsequent maintenance and replacement.

[0039] During operation, the coolant flows from the liquid inlet 211 into the bottom plate 21, dissipating heat from the bottom surface of the battery module 1. When the bottom plate 21 is filled with coolant, the coolant inside the bottom plate 21 flows into the multiple sleeves 241 on the bottom plate 21 and pushes against the multiple balls 2421. At this time, the elastic portion 2422 is compressed, and the coolant can flow evenly into the frame 22 through the multiple openings 2413. Similarly, when the coolant in the frame 22 is filled, it enters the top plate 23 through the multiple sleeves 241 on the top plate 23 and is then discharged through the liquid outlet 231.

[0040] It should be noted that by providing multiple connecting portions 24, the coolant can flow evenly through the bottom plate 21, the frame 22, and the top plate 23, thereby evenly dissipating heat from each battery cell 11. This prevents uneven coolant flow from causing excessive temperatures in a particular battery cell 11, which could damage the battery cell 11 and shorten the life of the battery module 1. Providing a check assembly 242 can further ensure even coolant flow.

[0041] For example, after the coolant flows into the base plate 21 from the liquid inlet 211, when the coolant enters the partial sleeve 241, due to the obstruction of the corresponding non-return component 242, the coolant will temporarily not flow into the frame 22, but will flow to other parts that are not filled with coolant. Only after the coolant in the base plate 21 is filled, the coolant will flow into the frame 22 due to the external pressure (the coolant can be injected into the base plate 21 through an externally arranged pump body) squeezing the non-return components 242, that is, the flow rate and flow rate of the coolant entering the frame 22 are almost the same, thereby ensuring that the multiple battery cells 11 of the battery module 1 can dissipate heat evenly, avoiding the problem of uneven heat dissipation of the multiple battery cells 11.

[0042] When the present invention is implemented, the multiple battery cells 11 of the battery module 1 are first placed in the multiple accommodating spaces 224 of the heat exchange device 2, and then the bottom plate 21, frame 22 and top plate 23 in the heat exchange device 2 are fixedly connected to each other. At this time, the bottom and side surfaces of each battery cell 11 are respectively adhered to the bottom plate 21 and frame 22, and the safety valve 111 on the top surface of the battery cell 11 is connected to the air cooling channel 4 through the corresponding vent 232. Then, the coolant is injected into the bottom plate 21 from the liquid inlet 211 through an external pump body. When the coolant fills the bottom plate 21, it flows evenly into the frame 22 through multiple connecting parts 24 evenly distributed on the bottom plate 21. At the same time, with the help of multiple check components 242, the coolant entering each connecting part 24 can flow into the frame 22 with almost equal flow rate and flow rate, thereby ensuring that the multiple battery cells 11 of the battery module 1 can dissipate heat evenly. Similarly, the multiple connecting parts 24 on the top plate 23 are also used to allow the coolant in the frame 22 to flow out evenly.

[0043] When the battery cell 11 is overheated or about to catch fire, smoke may come out of the safety valve 111. At this time, the smoke can be discharged to the outside through the air cooling channel 4 in time to avoid affecting other battery cells 11. At the same time, it can remind the driver that there is a battery failure, so that the driver can avoid danger in time.

[0044] The present invention, by providing multiple accommodating spaces 224, can fully and evenly dissipate heat from each battery cell 11, greatly improving heat dissipation efficiency compared to the prior art. Furthermore, when an individual battery cell 11 experiences an abnormality, the accommodating spaces 224 isolate it, thereby preventing damage to other battery cells 11. The provision of an air cooling channel 4 allows heat dissipation from the heat exchange device 2, thereby improving the heat exchange effect of the heat exchange device 2 on each battery cell 11. Furthermore, when an individual battery cell 11 experiences an abnormality (overheating or fire), smoke generated by the battery cell 11 can be quickly discharged through the air cooling channel 4, preventing it from affecting other battery cells 11 and causing further damage.

[0045] The above description is only a preferred embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A new energy vehicle battery heat exchange system, characterized in that: include: A battery module (1) comprising a plurality of battery cells (11); A heat exchange device (2) comprises a bottom plate (21) with a hollow interior, a frame (22) and a top plate (23); a liquid inlet (211) is provided on one side of the bottom plate (21); a liquid outlet (231) is provided on one side of the top plate (23); a plurality of connecting portions (24) are uniformly distributed on the top plate (23) and the bottom plate (21); the interiors of the bottom plate (21), the frame (22) and the top plate (23) are connected via the plurality of connecting portions (24); a plurality of accommodating spaces (224) are provided in the frame (22); and a plurality of battery cells (11) are respectively plugged into the plurality of accommodating spaces (224); The communication portion (24) comprises a sleeve (241), one end of the sleeve (241) is located inside the bottom plate (21) or the top plate (23), the other end of the sleeve (241) extends into the interior of the frame (22), and a non-return assembly (242) is provided at one end of the sleeve (241) close to the frame (22); A protective box (3) is used to support the heat exchange device (2), and an air cooling channel (4) is provided between the top wall and two side walls in the longitudinal direction of the protective box (3) and the outer wall of the heat exchange device (2). An air inlet (31) and an air outlet (32) are respectively provided on opposite sides of the protective box (3).

2. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: The frame (22) includes a rectangular frame (221) that passes through from top to bottom, a plurality of transverse partitions (222) and a plurality of longitudinal partitions (223) fixed in the rectangular frame (221), the plurality of transverse partitions (222) and the plurality of longitudinal partitions (223) dividing the interior of the rectangular frame (221) into a plurality of accommodating spaces (224), the plurality of transverse partitions (222), the plurality of longitudinal partitions (223) and the interior of the rectangular frame (221) are all hollow structures and are interconnected, and the top and bottom ends of the frame (22) are respectively provided with a plurality of through holes (225) that are connected to the interior thereof, for receiving a plurality of connecting portions (24).

3. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: A valve chamber (2411) is provided inside the sleeve (241) at one end close to the frame (22). The diameter of the valve chamber (2411) is larger than the inner diameter of the sleeve (241), so that a step (2412) is formed between the valve chamber (2411) and the inner wall of the sleeve (241). The side wall of the valve chamber (2411) is provided with a plurality of openings (2413) communicating with the outside. The non-return assembly (242) includes a sphere (2421) slidably arranged in the valve chamber (2411) and an elastic portion (2422) for pushing the sphere (2421) to move toward the step (2412). The diameter of the sphere (2421) is larger than the inner diameter of the sleeve (241).

4. The new energy vehicle battery heat exchange system according to claim 3, characterized in that: The elastic portion (2422) is a compression spring.

5. The new energy vehicle battery heat exchange system according to claim 4, characterized in that: One end of the sleeve (241) close to the frame (22) is detachably connected to a cover plate (243), and both ends of the compression spring are respectively in contact with the cover plate (243) and the sphere (2421).

6. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: The top ends of the plurality of battery cells (11) are each provided with a safety valve (111), the top plate (23) is provided with a plurality of ventilation holes (232) that pass through from top to bottom, and the bottom ends of the plurality of ventilation holes (232) are respectively covered above the plurality of safety valves (111).

7. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: Blocks (33) are fixed at the four corners of the interior of the protection box (3), and the opposing surfaces of the two blocks (33) on both sides of the length direction of the protection box (3) are inner side surfaces (331). The two sides of the length direction of the heat exchange device (2) are respectively in contact with the corresponding inner side surfaces (331) of the block (33), so that an "X"-shaped air cooling channel (4) is formed between the interior of the protection box (3) and the heat exchange device (2).

8. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: The top surface of the bottom plate (21) is provided with a plurality of grooves (212), and the plurality of grooves (212) are adapted to the bottoms of the plurality of battery cells (11) and are used to support and cover the bottoms of the plurality of battery cells (11).

9. The new energy vehicle battery heat exchange system according to claim 1, characterized in that: The bottom surface of the top plate (23) is provided with a plurality of grooves (212), and the plurality of grooves (212) are adapted to the tops of the plurality of battery cells (11) and are used to support and cover the tops of the plurality of battery cells (11).

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