Side cold battery pack and drying method thereof

Abstract

The invention belongs to the technical field of energy storage equipment, and particularly relates to a side cold battery pack drying method which comprises the following steps: S1, winding and fixing an integrally formed cooling pipe on two sides of a plurality of battery modules on a bottom plate, and mounting an upper cover on the bottom plate to form a closed box body; s2, a vacuum pump communicates with an anti-explosion valve on the box body through a pipeline, air in the box body is pumped out through the vacuum pump, and negative pressure is formed in the box body; s3, the pipeline and the anti-explosion valve are disconnected, the box body with negative pressure inside automatically sucks air outside the box body through the anti-explosion valve, and water vapor in the air is intercepted by the waterproof ventilation valve; the invention further relates to the side cold battery pack, the water inlet temperature is high, the local temperature difference is small, after the box body is assembled, the vacuum pump is communicated with the waterproof ventilation valve, air in the box body is pumped out through the vacuum pump, the interior of the battery pack is dried, the humidity in the battery pack is low, and condensation is not prone to being generated.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to a side-cooled battery pack and a drying method thereof. Background Art

[0002] The battery cabinet is used to store and manage multiple battery packs. The battery pack includes multiple battery modules. The battery modules will generate a lot of heat when working. Overheating of the battery modules will reduce the efficiency of the internal chemical reaction and increase the risk of thermal runaway. Therefore, the battery pack needs to be cooled.

[0003] Traditional battery packs are generally cooled by cold plates, which are located at the bottom of the battery pack. The circulating pipeline transmits the coolant / refrigerant to the flow channel in the cold plate, and exchanges heat with the battery modules in the battery pack through the upper surface of the cold plate. However, there are the following problems: In order to ensure the heat dissipation effect, the inlet temperature of the coolant / refrigerant (the temperature when it just enters the battery pack) is often low, and the lower surface of the cold plate is located on the outside of the battery pack, resulting in a large temperature difference between the inside and outside of the battery pack and between the bottom and top of the battery pack. When the local / inside and outside temperature difference exceeds 10 degrees Celsius and the air humidity is high, condensation is likely to occur, and the condensed water generated can easily cause short circuits in electrical components and corrosion of the casing.

[0004] In order to solve the above problems, desiccant or dehumidifier is generally installed in the battery cabinet. However, the absorption capacity of desiccant is limited and needs to be replaced regularly. Dehumidifier needs to work for a long time in a humid environment and has high electricity cost. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide a method for drying a side-cooled battery pack so that condensation is less likely to occur inside and outside the battery pack.

[0006] The technical solution adopted by the present invention is as follows: A drying method for a side-cooled battery pack comprises the following steps: S1: Winding and fixing the integrally formed cooling pipe on both sides of the plurality of battery modules on the bottom plate, and installing the upper cover on the bottom plate to form a closed box; S2: Connect the vacuum pump to the explosion-proof valve on the box through a pipeline, and use the vacuum pump to extract the air in the box to form a negative pressure in the box; S3: Disconnect the connection between the pipeline and the explosion-proof valve. The box with negative pressure inside automatically inhales the air outside the box through the explosion-proof valve, and the water vapor in the air is intercepted by the waterproof breathable valve.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. The battery module is composed of multiple cells. When working, the chemical reaction inside the cell causes the center area of ​​the cell to generate a large amount of heat. The cell tabs are the main channels for the current to enter and exit. When a large current passes through, a large amount of heat will also be generated. Therefore, the main heating area of ​​the battery pack is located in the middle and upper part of the cell. The cooling pipe is close to the side of the battery module and is closer to the main heating area of ​​the battery module. Therefore, compared with the bottom cold plate solution, the cooling pipe of this solution has a better heat dissipation effect. 2. In the side-cooled battery pack in the prior art, a side cold plate is installed on the side of each battery module, and a water inlet and a water outlet are respectively arranged at both ends of each side cold plate. The liquid cooling pipeline is divided into multiple branch pipes connected to each water inlet to form multiple side cold plates in parallel. However, multiple side cold plates in parallel cause the internal coolant to be diverted, which may cause uneven flow, thereby causing uneven heat inside the battery pack, affecting the heat dissipation effect, and may cause a large local temperature difference in the battery pack. The cooling pipe of this solution is a single channel without branch pipes, so the internal coolant / refrigerant will not be diverted, and the heat dissipation effect is good and the temperature uniformity is better; 3. Since the cooling pipe in this solution has good heat dissipation effect, compared with other refrigeration solutions, the inlet temperature of the coolant / refrigerant in the cooling pipe can be higher, achieving the same refrigeration effect, reducing the power of the compressor and reducing energy consumption; 4. By setting up an explosion-proof valve and taking advantage of its waterproof properties, after the battery pack is assembled, a vacuum pump can be used to connect the waterproof and breathable valve to extract the air in the box, which is in a vacuum state. After the vacuum pump is removed, the negative pressure in the box automatically inhales the outside air, and the water vapor in the air is intercepted in the waterproof and breathable valve, thereby ensuring the dryness of the box; 5. In this solution, the water inlet temperature of the cooling pipe is high, which reduces the temperature difference between the cooling pipe, the liquid inlet pipe, the liquid outlet pipe and the outside, and the temperature uniformity inside the battery pack is good, which reduces the local temperature difference, making it difficult for condensation inside and outside the battery pack.

[0008] As a preferred embodiment of the present invention, the explosion-proof valve adopts a one-way waterproof and breathable valve.

[0009] Beneficial effect: By setting a one-way waterproof breathable valve, the waterproof membrane inside the waterproof breathable valve is hydrophilic on the inside and hydrophobic on the outside. When air is pumped out, the internal water vapor can pass through the waterproof membrane, and when the box inhales gas, the water vapor is blocked.

[0010] As a preferred embodiment of the present invention, the connecting block is welded to the sealing plate, and the joint is welded to the connecting block to form a joint structure; the sealing plate in the joint structure is sleeved on the cooling pipe through the first through hole, and then welded and fixed, and the sealant is filled in the glue injection groove in the connecting block; the fixing plate is installed on the inner side of the upper cover by means of sealing screws; the upper cover is buckled on the bottom plate, and the sealing plate and the fixing plate are connected by means of sealing screws.

[0011] Beneficial effect: Since the risk of leakage is highest at the connection between the connector and the cooling tube (leakage points occur during welding), the sealing plate is close to the fixing plate, which blocks the gap between the cooling tube and the fixing plate, ensuring the sealing inside the battery pack. Placing the connector on the outside of the sealing plate, that is, the outside of the battery pack, reduces the risk of leakage inside the battery pack, while ensuring the sealing inside the box.

[0012] A second object of the present invention is to provide a side-cooled battery pack, which is dried by the drying method of the side-cooled battery pack described in the above item, comprising a box body and multiple battery modules, wherein the multiple battery modules are installed in the box body, and further comprising a cooling pipe, wherein the cooling pipe is wound along each battery module one by one and contacts with both sides of each battery module, and the two ends of the cooling pipe are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the refrigeration equipment.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Compared with the bottom cold plate solution, the cooling pipe of this solution is closer to the main heating area, and the heat dissipation effect is better; 2. The cooling pipe of this solution is a single channel without branch pipes, so the internal coolant / refrigerant will not be diverted, the heat dissipation effect is good, and the temperature uniformity is better; 3. Since the cooling pipe in this solution has good heat dissipation effect, compared with other refrigeration solutions, the inlet temperature of the coolant / refrigerant in the cooling pipe can be higher, achieving the same refrigeration effect, reducing the power of the compressor and reducing energy consumption; 4. In this solution, the water inlet temperature of the cooling pipe is high, which reduces the temperature difference between the cooling pipe, the liquid inlet pipe, the liquid outlet pipe and the outside, and the temperature uniformity inside the battery pack is good, which reduces the local temperature difference, making it difficult for condensation inside and outside the battery pack.

[0014] As a preferred embodiment of the present invention, a waterproof breathable valve is provided on the side wall of the box body, and air can only enter the box body through the waterproof breathable valve.

[0015] Beneficial effect: By setting a waterproof breathable valve, after the battery pack is assembled, a vacuum pump can be used to connect to the waterproof breathable valve to extract the air in the box and put it in a vacuum state. After removing the vacuum pump, the negative pressure in the box automatically inhales the outside air, and the water vapor in the air is intercepted in the waterproof breathable valve, thereby ensuring the dryness of the box.

[0016] As a preferred embodiment of the present invention, the cooling tube is an aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling tube.

[0017] 1. The cooling tube obtained by extrusion and bending is not prone to leakage. The side wall of the aluminum square tube is flat, which fits the side wall of the battery module better and has a better cooling effect. 2. The refrigeration system generally used for battery packs is divided into air cooling, liquid cooling and direct cooling. The difference between the liquid cooling unit and the direct cooling unit is that in the liquid cooling unit, the refrigerant is first cooled, and then the refrigerant exchanges heat with the circulating cooling water, and finally the battery module is cooled by the cooling water. In the direct cooling unit, the refrigerant is cooled and then directly dissipated to the battery module. Since the refrigerant will become a gas-liquid mixture after absorbing heat, the internal pressure of the pipeline is relatively high. Therefore, the pipeline of the direct cooling unit generally adopts metal pipelines; in this scheme, the one-piece aluminum square tube has higher strength and better toughness, and can withstand certain extrusion and deformation. Therefore, the pipeline can be applied to the direct cooling unit; The existing parallel side cooling structure adopts the combination of side cooling plate and plastic pipe. Plastic pipe cannot bear the pressure of refrigerant flow. If the plastic pipe is directly replaced with metal pipe to bear greater pressure, it will lead to the inability to dock the side cooling plate and metal pipe when installing (the joints used for docking of the side cooling plate are generally welded on the bottom plate. Due to processing errors, the position of each joint cannot be guaranteed to be accurate. The plastic pipe itself is flexible and can adapt to the error, but the metal pipe cannot adjust the position of the docking port. In order to ensure the sealing, the metal pipe and the joint need to be welded again, which makes the installation process more cumbersome. Welding makes the whole structure difficult to disassemble, which is inconvenient when repairing the battery module. 3. When installing the side cold plate, multiple battery modules can be placed on the bottom plate of the battery pack, and then the cooling pipes can be placed so that the cooling pipes are located on both sides of the multiple battery modules. Then, the cooling pipes and the multiple battery modules are squeezed inwardly and shaped through the extrusion devices (hydraulic cylinders, air cylinders) on both sides. Therefore, the cooling pipes also have a certain limiting effect on the battery modules, making the overall structure more stable. Compared with the parallel side cooling structure in the prior art, multiple welding inside the battery pack is not required, and the installation is more convenient and quick.

[0018] As a preferred embodiment of the present invention, both ends of the cooling tube extend out of the battery pack body and are located on the same side of the battery pack; two adjacent side tubes are located between adjacent battery modules; one of the end tubes is bent outward at the connection between two adjacent side tubes to form a ball head or a square head.

[0019] Beneficial effects: 1. In the parallel side cooling structure, the liquid inlet and outlet are located on the front and rear sides of the battery pack. When the liquid inlet pipe of the liquid cooling unit is located on the front of the battery pack, the liquid outlet pipe needs to go around to the back of the battery pack to connect with the liquid outlet, which makes the pipeline laying more complicated and the required length of the pipeline will also increase. During maintenance, it may be necessary to open the back panel of the battery cabinet. In this solution, when the liquid inlet and outlet of the cooling pipe are located on the same side, it is more convenient to connect with the liquid cooling unit / direct cooling unit, the pipeline length will not increase, and it is more convenient for maintenance.

[0020] 2. Since the number of battery modules is generally an even number, it is necessary to repeat the winding in the gap between adjacent battery modules so that the liquid inlet and the liquid outlet are located on the same side of the battery pack; the two sections of the repeatedly wound side tubes are between two adjacent battery modules. If the end tube between the two sections of the side tubes is an inwardly bent fillet, in order to avoid bending and breakage, it is necessary to ensure that there is a certain distance between the two sections of the side tubes, so that the spacing between the adjacent battery modules at this location is different from the spacing between other adjacent battery modules, and installation is impossible. When the cooling tube is extruded and installed, it is inevitable that the side tubes at both ends are close to each other, and the inwardly bent end tube has a tendency to bend inward, which will cause the end tube to break. Therefore, in order to make the total thickness of the two sections of the side tube thin enough, a round head or a square head is provided at the end of the section of the pipe to meet the bending processing technology. During installation, the side tube is squeezed, and the outwardly bent end tube has a tendency to continue to bend outward, avoiding the end tube bending inward and causing breakage.

[0021] As a preferred embodiment of the present invention, a transition structure is further included, the transition structure includes a sealing plate and a joint, the sealing plate is provided with a first through hole, the cooling pipe passes through the first through hole and is fixedly connected to the sealing plate, and the joint is communicated with an end of the cooling pipe; The box body includes an upper cover and a bottom plate, the upper cover is detachably mounted on the bottom plate, the side wall of the upper cover is fixedly connected to a fixing plate, a second through hole is opened on the fixing plate, the sealing plate is tightly pressed against the inner side of the fixing plate, and the end of the cooling pipe passes through the second through hole and is fixedly connected to the joint, so that the joint is located on the outer side of the fixing plate.

[0022] Since the connection between the connector and the cooling pipe has the highest risk of leakage (leakage points occur during welding), the sealing plate is placed close to the fixed plate to block the second via, ensuring the sealing inside the battery pack. The connector is placed on the outside of the sealing plate, that is, the outside of the battery pack, reducing the risk of leakage inside the battery pack.

[0023] As a preferred embodiment of the present invention, the adapter structure further includes a connecting block, which is fixedly connected to the sealing plate and extends out of the second through hole. A connecting cavity is provided in the connecting block, and the cooling pipe is connected to the joint through the connecting cavity.

[0024] Beneficial effect: The connecting block is used to connect the joint and the cooling pipe, and because the connecting block can pass through the second through hole, during welding and installation, the welding point between the connecting block and the sealing plate is located on the outside of the sealing plate, that is, the outside of the battery pack, thereby avoiding leakage inside the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of an embodiment of a side-cooled battery pack of the present invention; Figure 2 is a schematic diagram of the internal structure of an embodiment of a side-cooled battery pack of the present invention; Figure 3is a schematic diagram of the structure of the cooling tube in the embodiment of the side-cooled battery pack of the present invention; Figure 4 is a schematic structural diagram of a fixing plate in an embodiment of a side-cooled battery pack of the present invention; Figure 5 is a structural schematic diagram of a switching structure in an embodiment of a side-cooled battery pack of the present invention; Figure 6 It is a flow chart of the steps of the drying method of the side-cooled battery pack of the present invention.

[0026] The reference numerals include: cooling tube 1, liquid inlet 11, liquid outlet 12, ball head 13, side tube 14, end tube 15, box body 2, bottom plate 21, upper cover 22, battery module 23, support frame 24, waterproof breathable valve 25, fixing plate 3, circular plate 31, accommodating groove 32, second through hole 33, sealing plate 41, first through hole 42, connecting block 43, connecting cavity 44, joint 45, glue injection groove 46. DETAILED DESCRIPTION

[0027] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0028] In the description of the present application, the terms "first", "second", etc. are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] See also Figure 1 , Figure 2 , Figure 3 This embodiment discloses a battery pack, including a bottom plate 21, an upper cover 22, a plurality of battery modules 23, and a side cooling structure; the side cooling structure includes an integrally formed cooling pipe 1 and two transfer structures.

[0030] Among them, see Figure 2 A support frame 24 is fixedly connected to the bottom plate 21, and the support frame 24 supports the cooling pipe 1. The same end of multiple battery modules 23 is close to the inner side of the support frame 24; the cooling pipe 1 is wound along each battery module 23 one by one, and contacts with both sides of each battery module 23, and a strip of thermal conductive insulating glue is bonded to the side wall of each battery module 23; the two adapter structures are respectively installed at both ends of the cooling pipe 1, and both extend out of the side wall of the upper cover 22, and are detachably connected to the upper cover 22; the two ends of the cooling pipe 1 are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the refrigeration equipment through the corresponding adapter structures.

[0031] Among them, see Figure 4 , Figure 5 The transition structure includes a connecting block 43, a sealing plate 41 and a joint 45. The sealing plate 41 is provided with a first through hole 42. The cooling pipe 1 passes through the first through hole 42 and is fixedly connected to the sealing plate 41. The joint 45 is connected to the end of the cooling pipe 1. The side wall of the upper cover 22 is fixedly connected to a fixing plate 3. The fixing plate 3 is provided with a second through hole 33. The sealing plate 41 is pressed tightly against the inner side of the fixing plate 3. The connecting block 43 is welded on the sealing plate 41 and extends out of the second through hole 33. A connecting cavity 44 is provided in the connecting block 43. The cooling pipe 1 is connected to the joint 45 through the connecting cavity 44. A glue injection groove 46 is provided on the inner side of the connecting block 43 around the cooling pipe 1. The glue injection groove 46 is filled with sealant.

[0032] Among them, see Figure 4 , Figure 5 The fixing plate 3 includes a circular plate 31 and a receiving groove 32. The circular plate 31 is installed on the inner wall of the upper cover 22 by screws. The receiving groove 32 is fixedly connected to the inner wall of the circular plate 31 and is located on the inner side of the upper cover 22. It is connected to the sealing plate 41 by screws. The second through hole 33 is located on the receiving groove 32. The connecting block 43 passes through the second through hole 33 and is located in the receiving groove 32.

[0033] In this embodiment, in some battery cabinets, the battery packs are stacked in the cabinet, and the space between the front end of the battery pack and the cabinet door is relatively narrow. Directly setting the connection block 43 and the joint 45 outside the side wall of the upper cover 22 will cause the cabinet door to be unable to close. In this solution, the connection block 43 is located in the receiving groove 32, so that the transition structure does not have more protruding parts relative to the upper cover 22, occupies less external space, and is more beautiful; the cooling pipe 1 in the solution is made of aluminum tube, which can be plastically deformed under the action of a certain external force. When tightening the screws between the sealing plate 41 and the receiving groove 32, the slight offset of the sealing plate 41 and the cooling pipe 1 (due to processing and extrusion) can be corrected due to the continuous tightening of the screws; the upper cover 22, the fixing plate 3, the receiving groove 32, and the sealing plate 41 form a sealed shell, so that the connection block 43 is located outside the sealed shell, the connection block 43 is welded to the sealing plate 41, and the joint 45 is welded to the connection block 43. Both welding points are located outside the sealed shell, thereby reducing the risk of leakage in the battery pack. .

[0034] Among them, see Figure 3 The cooling tube 1 is an aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling tube 1; the cooling tube 1 is staggered with multiple side tubes 14 and end tubes 15, and the connection between the side tubes 14 and the end tubes 15 is rounded, the side tubes 14 correspond to the side of each battery module 23, and the end tubes 15 correspond to the end of each battery module 23.

[0035] The two ends of the cooling tube 1 are located on the same side of the upper cover 22; two adjacent side tubes 14 are located between adjacent battery modules 23; one of the end tubes 15 is bent outward at the connection between two adjacent side tubes 14 to form a ball head 13 or a square head.

[0036] Among them, see Figure 1 The upper cover 22 is provided with a waterproof breathable valve 25 , and air can only enter the box body 2 through the waterproof breathable valve 25 .

[0037] See also Figure 6 The drying method of this embodiment is as follows, comprising the following steps: S1: On the bottom plate 21, an integrally formed cooling pipe 1 is wound around two sides of a plurality of battery modules 23, and an upper cover 22 is installed on the bottom plate 21 to form a closed box body 2; S2: Connect the vacuum pump to the explosion-proof valve on the box 2 through a pipeline, and use the vacuum pump to extract the air in the box 2 so that negative pressure is formed in the box 2; S3: disconnect the connection between the pipeline and the explosion-proof valve, and the box body 2 with negative pressure inside automatically inhales the air outside the box body 2 through the explosion-proof valve, and the water vapor in the air is intercepted by the waterproof breathable valve 25.

[0038] The steps specifically include: positioning by the support frame 24, placing a plurality of battery modules 23 with insulating sealant on the bottom plate 21, and placing the ends of the plurality of battery modules 23 against the inner side of the support frame 24, and placing the cooling pipe 1 from top to bottom so that the cooling pipe 1 is wound around two places of the battery module 23; Through two sets of extrusion mechanisms, the cooling tube 1 and the battery module 23 are extruded inward from both sides of the bottom plate 21 simultaneously, so that the side wall of the cooling tube 1 contacts the side wall of the battery module 23; The sealing plate 41, the connecting block 43 and the joint 45 in the transfer structure have been welded before assembly. The fixing plate 3 is mounted on the inner side of the upper cover 22 by screws. The cooling pipe 1 is inserted into the connecting cavity 44 through the first through hole 42. The sealing plate 41 and the cooling pipe 1 are welded and fixed, and the filling glue is injected into the glue injection groove 46. The upper cover 22 is buckled on the bottom plate 21, and the sealing plate 41 and the fixing plate 3 are connected by screws to complete the assembly. The vacuum pump is connected to the waterproof breathable valve 25; the air in the box body 2 is extracted by the vacuum pump.

[0039] The original air in the box body 2 is extracted by a vacuum pump to form negative pressure, and the vacuum pump and the waterproof breathable valve 25 are separated. The waterproof breathable valve 25 is kept stationary and waits for air to be continuously taken in. The water vapor in the newly-entered air is intercepted by the waterproof breathable valve 25, thereby drying the inside of the battery pack. The humidity inside the battery pack is low, the local temperature difference is small, and condensation water is not easy to be generated.

[0040] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for drying a side-cooled battery pack, characterized in that: The steps include: S1: Winding and fixing the integrally formed cooling pipe on both sides of the plurality of battery modules on the bottom plate, and installing the upper cover on the bottom plate to form a closed box; S2: Connect the vacuum pump to the explosion-proof valve on the box through a pipeline, and use the vacuum pump to extract the air in the box to form a negative pressure in the box; S3: Disconnect the connection between the pipeline and the explosion-proof valve. The box with negative pressure inside automatically inhales the air outside the box through the explosion-proof valve, and the water vapor in the air is intercepted by the waterproof breathable valve.

2. The drying method of a side-cooled battery pack according to claim 1, characterized in that: The explosion-proof valve adopts a one-way waterproof and breathable valve.

3. The drying method of a side-cooled battery pack according to claim 1, characterized in that: In step S1, Weld the connecting block to the sealing plate, and weld the joint to the connecting block to form a joint structure; sleeve the sealing plate in the joint structure on the cooling pipe through the first through hole, and then fix it by welding, and fill the sealant in the injection groove in the connecting block; install the fixing plate on the inner side of the upper cover by sealing screws; buckle the upper cover on the bottom plate, and connect the sealing plate and the fixing plate by sealing screws.

4. A side-cooled battery pack, characterized in that: The drying is performed by the drying method of a side-cooled battery pack as described in any one of claims 1 to 3, comprising a box body and a plurality of battery modules, wherein the plurality of battery modules are installed in the box body, and further comprising a cooling pipe, wherein the cooling pipe is wound along each battery module one by one and contacts with both sides of each battery module, and the two ends of the cooling pipe are respectively connected to a liquid inlet pipe and a liquid outlet pipe of a refrigeration device.

5. The side-cooled battery pack according to claim 4, characterized in that: The side wall of the box is provided with a waterproof and breathable valve, and air can only enter the box through the waterproof and breathable valve.

6. The side-cooled battery pack according to claim 4, characterized in that: The cooling pipe is an aluminum square pipe obtained by extrusion, and the aluminum square pipe is bent multiple times to obtain the cooling pipe.

7. The side-cooled battery pack according to claim 4, characterized in that: Both ends of the cooling tube extend out of the battery pack body and are located on the same side of the battery pack; two adjacent side tubes are located between adjacent battery modules; one of the end tubes is bent outward at the connection between two adjacent side tubes to form a ball head or a square head.

8. The side-cooled battery pack according to claim 4, characterized in that: It also includes a transition structure, the transition structure includes a sealing plate and a joint, the sealing plate is provided with a first through hole, the cooling pipe passes through the first through hole and is fixedly connected to the sealing plate, and the joint is communicated with an end of the cooling pipe; The box body includes an upper cover and a bottom plate, the upper cover is detachably mounted on the bottom plate, the side wall of the upper cover is fixedly connected to a fixing plate, a second through hole is opened on the fixing plate, the sealing plate is tightly pressed against the inner side of the fixing plate, and the end of the cooling pipe passes through the second through hole and is fixedly connected to the joint, so that the joint is located on the outer side of the fixing plate.

9. The side-cooled battery pack according to claim 8, characterized in that: The transfer structure also includes a connection block, which is fixedly connected to the sealing plate and extends out of the second through hole. A connecting cavity is provided in the connection block, and the cooling pipe is connected to the joint through the connecting cavity.

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