A method for installing a side cooling battery pack and a battery pack

Abstract

This patent application belongs to the field of energy storage equipment technology, specifically relating to an installation method for a side-cooled battery pack, including the following steps: S1: placing multiple battery modules and cooling pipes on a base plate, such that the cooling pipes sequentially pass around both sides of each battery module; S2: using a pressing mechanism, simultaneously pressing the cooling pipes and battery modules inward from both sides of the base plate, so that the sidewalls of the cooling pipes contact the sidewalls of the battery modules; S3: passing a top cover through both ends of the cooling pipes and installing it on the base plate, installing two adapter structures on the outside of the top cover and connecting them to both ends of the cooling pipes; it also relates to a side-cooled battery pack; using the above-mentioned battery pack and installation method has the advantages of high assembly efficiency, good heat dissipation, low leakage risk, and low condensation.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment technology, specifically to an installation method for a side-cooled battery pack and the battery pack itself. Background Technology

[0002] Existing side-cooled battery packs improve heat dissipation by placing multiple cooling plates on the sides of the battery module (which consists of multiple cells). Compared to designs that place the cooling plates at the bottom of the battery module, side-cooled battery packs are closer to the heat-generating areas of the battery module (chemical reactions inside the cells and current flow through the tabs cause greater heat generation in the upper and middle parts of the battery module).

[0003] However, existing side-cooled battery packs require the following steps during installation: placing multiple battery modules on a base plate and positioning them using connectors; installing multiple cold plates and adapters on the sides of the battery modules and welding them to the base plate; installing two plastic pipes with multiple branch pipes at the inlet and outlet ends of the battery pack and welding the branch pipes to the adapters.

[0004] During the installation process described above, the connection of the cold plate, connectors, and branch pipes all require welding. The large number of welding points not only leads to a longer assembly time but also makes the welding points prone to leakage, thereby increasing the risk of leakage inside the battery pack. In addition, each battery module and cold plate needs to be positioned and fixed one by one during the installation process, making the installation process quite cumbersome. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a method for installing a side-cooled battery pack. Using this method to assemble the battery pack results in high assembly efficiency and low risk of battery pack leakage.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for installing a side-cooled battery pack, using a one-piece molded cooling pipe, includes the following steps:

[0008] S1: Place multiple battery modules and cooling pipes on the base plate so that the cooling pipes pass around both sides of each battery module in sequence;

[0009] S2: Through the extrusion mechanism, the cooling pipe and the battery module are simultaneously extruded inward from both sides of the base plate, so that the side wall of the cooling pipe contacts the side wall of the battery module.

[0010] S3: Pass the top cover through both ends of the cooling pipe and install it on the base plate. Install the two adapter structures on the outside of the top cover and connect them to both ends of the cooling pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. Since the cooling pipe is integrally molded, the part located inside the battery pack does not need to be welded or have joints, which reduces the risk of leakage and prevents the cell from short-circuiting due to coolant leakage.

[0013] 2. When installing the battery pack, only the cooling pipe and the adapter structure need to be assembled. After the cooling pipe is placed on the base plate, the connection between the two adapter structures and the cooling pipe can be welded, with only two weld points. The connection between the adapter structure and the top cover can be bolted. Compared with the parallel side cooling structure, the number of weld points is greatly reduced, making assembly more convenient and disassembly easier during maintenance.

[0014] 3. In step S2, due to the synchronous extrusion from both sides, even if the horizontal placement of the battery module is slightly misaligned during each installation, it will not affect the position after extrusion, thus saving the positioning time of the battery module before extrusion.

[0015] In a preferred embodiment of the present invention, the cooling pipe is made of aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling pipe; the cooling pipe is provided with multiple side pipes and end pipes in an alternating manner, and the connection between the side pipes and end pipes is rounded. The side pipes correspond to the side of each battery module, and the end pipes correspond to the end of each battery module.

[0016] Beneficial effects:

[0017] 1. Cooling pipes obtained by extrusion and bending are less prone to leakage. The sidewalls of aluminum square tubes are flat, which fits the sidewalls of the battery module better, resulting in better cooling performance.

[0018] 2. Cooling equipment for battery packs is generally classified into air-cooled, liquid-cooled, and direct-cooled systems. The difference between liquid-cooled and direct-cooled units lies in the following: In liquid-cooled units, the refrigerant is cooled first, then heat is exchanged between the refrigerant and circulating cooling water, and finally the cooling water dissipates heat from the battery module. In direct-cooled units, the refrigerant is cooled first, and then the refrigerant directly dissipates heat from the battery module. Because the refrigerant becomes a gas-liquid mixture after absorbing heat, the internal pressure of the pipes is relatively high. Therefore, direct-cooled units generally use metal pipes. In this solution, the one-piece molded aluminum square tube has high strength and good toughness, and can withstand a certain amount of extrusion and deformation. Therefore, this pipe can be used in direct-cooled units. The existing parallel side-cooling structure uses a combination of side-cooling plates and plastic pipes. The plastic pipes cannot withstand the pressure of refrigerant flow. If the plastic pipes are directly replaced with metal pipes to withstand greater pressure, it will cause problems when installing the side-cooling plates and metal pipes. (The joints used for the side-cooling plates are usually welded to the base plate. Due to processing errors, the position of each joint cannot be guaranteed to be precise. Plastic pipes are flexible and can adapt to this error, but metal pipes cannot be adjusted to the position of the joints. In addition, in order to ensure the sealing, the metal pipes and joints need to be welded again, making the installation process more complicated. Welding makes the entire structure difficult to disassemble, which is inconvenient when repairing the battery module.)

[0019] 3. When installing the side cooling plate, multiple battery modules can be placed on the bottom plate of the battery pack, and then the cooling pipes can be placed on both sides of the multiple battery modules. The cooling pipes and multiple battery modules are then squeezed inward and shaped by 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 existing technology, it does not require multiple welding inside the battery pack, making the installation more convenient and faster.

[0020] In a preferred embodiment of the present invention, a support frame is fixedly connected to the base plate. In step S1...

[0021] First, place multiple battery modules on the base plate, with the same end of each battery module in contact with the inside of the support frame. Then, place the cooling pipes between the multiple battery modules and limit the height of the end pipes using the support frame.

[0022] Beneficial effects: During assembly, the support frame can position the battery module and cooling pipe. When the cooling pipe is made of aluminum, it can be shaped by extrusion device (hydraulic cylinder or air cylinder). The support frame limits the height of the cooling pipe and the end of the battery module. When the extrusion device on both sides of the base plate extrudes the cooling pipe and the battery module, it can ensure the relative position of the cooling pipe and the battery module, so that the cooling pipe is close to the upper middle part of the battery module (the area of ​​the battery module with greater heat generation).

[0023] In a preferred embodiment of the present invention, in step S1, thermally conductive insulating adhesive is bonded to both sides of each battery module, and the thermally conductive insulating adhesive pre-positions the cooling pipe.

[0024] Beneficial effects:

[0025] 1. By setting thermally conductive insulating adhesive, the insulation performance of the battery module can be increased, and the connection between the battery module and the cooling pipe can be made more stable. If this thermally conductive insulating adhesive is not used, the cooling pipe may spring back after being squeezed.

[0026] 2. During installation, thermally conductive insulating adhesive is first applied to the side wall of each battery module, and then the cooling pipe is placed. After being squeezed by the extrusion device, the cooling pipe is squeezed onto the side wall of the battery module and bonded to the thermally conductive insulating adhesive. Since the side of the battery module is not a complete plane (the side wall of the cell has a chamfer, and there may be some misalignment between the cells), the gap between the cooling pipe and the side wall of the battery module can be filled by setting thermally conductive insulating adhesive (air in the gap will affect the heat exchange efficiency between the cell and the cooling pipe), thus ensuring the heat dissipation effect.

[0027] In a preferred embodiment of the present invention, in step S2...

[0028] After extrusion, side plates are installed on both sides of the base plate to provide secondary positioning for the extruded cooling pipes.

[0029] Beneficial effect: By setting the side plate to limit the cooling pipe, the cooling pipe is prevented from springing back and causing it to detach from the side wall of the battery module.

[0030] In 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 glue injection groove in the connecting block is filled with sealant; the fixing plate is installed on the inner side of the upper cover by fasteners; the upper cover is fastened to the bottom plate, and the sealing plate and the fixing plate are connected by fasteners.

[0031] Beneficial effects: Since the connection between the connector and the cooling pipe has the highest risk of leakage (leakage points due to welding), the sealing plate is tightly attached to the fixing plate, sealing the gap between the cooling pipe and the fixing plate, ensuring the airtightness of the battery pack. Placing the connector on the outside of the sealing plate, i.e. the outside of the battery pack, reduces the risk of leakage inside the battery pack.

[0032] In a preferred embodiment of the present invention, the fastener is a sealing screw.

[0033] Beneficial effects:

[0034] 1. The sealing screws ensure the battery pack's airtightness;

[0035] 2. The cooling pipe in the design is made of aluminum, which can undergo plastic deformation under a certain external force. When the screws between the sealing plate and the receiving groove are tightened, the slight misalignment of the sealing plate and cooling pipe (due to processing errors caused by processing and extrusion) can be corrected as the screws are continuously tightened.

[0036] The second objective of this invention is to provide a battery pack that is installed using the aforementioned side-cooled battery pack installation method. The pack includes a base plate, a top cover, and multiple battery modules. The multiple battery modules are mounted on the base plate. The pack also includes a side-cooling structure, which comprises a connecting structure and an integrally formed cooling pipe. The cooling pipe is wound around each battery module and contacts both sides of each battery module. Two connecting structures are respectively installed at both ends of the cooling pipe and extend beyond the side wall of the top cover. The two ends of the cooling pipe are respectively connected to the inlet and outlet pipes of a refrigeration device via corresponding connecting structures.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The inlet pipe, cooling pipe, and outlet pipe form a series structure, eliminating the need for coolant diversion within the cooling pipe and ensuring uniform flow through each battery module, thus guaranteeing temperature uniformity within the battery pack. The solder joints of the adapter structure are located on the outside of the battery pack, reducing the risk of coolant leakage from the cooling pipes within the battery pack.

[0039] 2. The cooling pipe is close to the side of the battery module, which is closer to the main heat-generating area of ​​the battery module. Therefore, compared with the bottom cooling solution, when the battery module generates the same amount of heat, the temperature of the coolant entering the cooling pipe can be higher to achieve the same cooling effect, reducing the power of the compressor and reducing energy consumption.

[0040] 3. Since condensation is related to ambient temperature and humidity, when the refrigeration equipment is working, the overall temperature of the coolant in the inlet pipe, outlet pipe and cooling pipe increases, which can reduce the risk of condensation and avoid short circuits in the battery cells and corrosion of the casing caused by condensate.

[0041] In a preferred embodiment of the present invention, the adapter structure includes a sealing plate and a connector. The sealing plate has a first through hole, the cooling pipe passes through the first through hole and is fixedly connected to the sealing plate, and the connector is connected to the end of the cooling pipe.

[0042] A fixing plate is fixedly connected to the side wall of the upper cover. A second through hole is provided on the fixing plate. The sealing plate is pressed against the inner side of the fixing plate. The end of the cooling pipe passes through the second through hole and is fixedly connected to the connector, so that the connector is located on the outer side of the fixing plate.

[0043] Beneficial effects: Since the connection between the connector and the cooling pipe has the highest risk of leakage (leakage points due to welding), the sealing plate is close to the fixing plate, blocking the second through hole and ensuring the airtightness of the battery pack. Placing the connector on the outside of the sealing plate, i.e. the outside of the battery pack, reduces the risk of leakage inside the battery pack.

[0044] In 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. The connecting block has a communicating cavity, through which the cooling pipe communicates with the connector.

[0045] Beneficial effects: The connecting block is used to connect the connector and the cooling pipe. Since the connecting block can pass through the second through hole, during welding installation, the welding point between the connecting block and the sealing plate is located on the outside of the sealing plate, that is, on the outside of the battery pack, which avoids leakage inside the battery pack.

[0046] In a preferred embodiment of the present invention, the inner side of the connecting block is provided with a glue injection groove surrounding the cooling pipe, and the glue injection groove is filled with sealant.

[0047] Beneficial effects: By setting up an injection groove and injecting sealant, the sealant can bond the sealing plate, connecting block and cooling pipe, making the connection more stable, and can also seal the gap between the cooling pipe and the connecting block, ensuring the airtightness.

[0048] In a preferred embodiment of the present invention, the fixing plate includes a U-shaped plate and a receiving groove. The U-shaped plate is installed on the inner wall of the upper cover by screws. The receiving groove is located on the inner side of the upper cover and is pressed against the sealing plate. The receiving groove is fixedly connected to the inner wall of the U-shaped plate and connected to the sealing plate by screws. The second through hole is located on the receiving groove. The connecting block passes through the second through hole and is located in the receiving groove.

[0049] Beneficial effects:

[0050] 1. In some battery cabinets, battery packs are stacked inside the cabinet. The space between the front of the battery pack and the cabinet door is relatively small. If the connecting block and the connector are placed directly outside the side wall of the top cover, the cabinet door will not be able to close. In this solution, the connecting block is located in the receiving groove, so that the adapter structure does not have much protrusion relative to the top cover, occupies less external space, and is more aesthetically pleasing.

[0051] 2. The cooling pipe in the design is made of aluminum, which can undergo plastic deformation under a certain external force. When the screws between the sealing plate and the receiving groove are tightened, the slight misalignment of the sealing plate and cooling pipe (due to processing errors caused by processing and extrusion) can be corrected as the screws are continuously tightened.

[0052] 3. The top cover, fixing plate, receiving groove, and sealing plate form a sealed outer shell, with the connecting block located on the outside of the sealed outer shell. The connecting block is welded to the sealing plate, and the joint is welded to the connecting block. Both welding points are located on the outside of the sealed outer shell, thereby reducing the risk of leakage in the battery pack. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the cooling pipe structure in an embodiment of the battery pack of the present invention;

[0054] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the battery pack of the present invention;

[0055] Figure 3 This is a schematic diagram of the structure of an embodiment of the battery pack of the present invention;

[0056] Figure 4 This is a schematic diagram of the structure of the fixing plate in an embodiment of the battery pack of the present invention;

[0057] Figure 5 This is a schematic diagram of the adapter structure in an embodiment of the battery pack of the present invention;

[0058] Figure 6 This is a flowchart illustrating the steps of an installation method for a side-cooled battery pack according to the present invention.

[0059] The attached reference numerals include: cooling pipe 1, liquid inlet 11, liquid outlet 12, ball head 13, side pipe 14, end pipe 15, housing 2, bottom plate 21, top cover 22, battery module 23, support frame 24, fixing plate 3, U-shaped plate 31, receiving groove 32, second through hole 33, sealing plate 41, first through hole 42, connecting block 43, connecting cavity 44, connector 45, and glue injection groove 46. Detailed Implementation

[0060] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0061] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0062] See Figure 1 , Figure 2 , Figure 3This embodiment discloses a battery pack, including a base plate 21, a top cover 22, multiple battery modules 23, and a side cooling structure; the side cooling structure includes an integrally formed cooling pipe 1 and two adapter structures.

[0063] Among them, see Figure 2 A support frame 24 is fixedly connected to the base plate 21. The support frame 24 supports the cooling pipe 1. The same end of multiple battery modules 23 is tightly attached to the inner side of the support frame 24. The cooling pipe 1 is wound around each battery module 23 one by one and contacts both sides of each battery module 23. A strip of thermally conductive insulating adhesive is adhered to the side wall of each battery module 23. Two adapter structures are respectively installed at both ends of the cooling pipe 1 and 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 liquid outlet pipe of the refrigeration equipment through the corresponding adapter structures.

[0064] Among them, see Figure 4 , Figure 5 The adapter structure includes a connecting block 43, a sealing plate 41, and a connector 45. The sealing plate 41 has a first through hole 42 through which the cooling pipe 1 passes and is fixedly connected to the sealing plate 41. The connector 45 is connected to the end of the cooling pipe 1. A fixing plate 3 is fixedly connected to the side wall of the upper cover 22. The fixing plate 3 has a second through hole 33. The sealing plate 41 is pressed against the inner side of the fixing plate 3. The connecting block 43 is welded to the sealing plate 41 and extends out of the second through hole 33. A connecting cavity 44 is provided inside the connecting block 43, through which the cooling pipe 1 is connected to the connector 45. An injection groove 46 is provided around the cooling pipe 1 on the inner side of the connecting block 43, and the injection groove 46 is filled with sealant.

[0065] Among them, see Figure 4 , Figure 5 The fixing plate 3 includes a U-shaped plate 31 and a receiving groove 32. The U-shaped 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 U-shaped plate 31 and is located inside the upper cover 22. It is also 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 inside the receiving groove 32.

[0066] Among them, see Figure 1 The cooling pipe 1 is made of aluminum square tube obtained by extrusion, and the aluminum square tube is bent multiple times to obtain the cooling pipe 1; the cooling pipe 1 is provided with multiple side pipes 14 and end pipes 15 in an alternating manner, and the connection between the side pipes 14 and the end pipes 15 is rounded. The side pipes 14 correspond to the side of each battery module 23, and the end pipes 15 correspond to the end of each battery module 23.

[0067] The cooling pipe 1 has two ends located on the same side of the top cover 22; two adjacent side pipes 14 are located between adjacent battery modules 23; one of the end pipes 15 bends outward at the connection between two adjacent side pipes 14 to form a ball head 13 or a square head.

[0068] See Figure 6 The second objective of this invention is to provide an installation method for a side-cooled battery pack, applicable to the aforementioned battery pack, comprising the following steps:

[0069] S1: Place multiple battery modules 23 and cooling pipes 1 on the base plate 21, so that the cooling pipes 1 pass through both sides of each battery module 23 in sequence.

[0070] S2: Through the extrusion mechanism, the cooling pipe 1 and the battery module 23 are simultaneously extruded inward from both sides of the base plate 21, so that the side wall of the cooling pipe 1 contacts the side wall of the battery module 23.

[0071] S3: Pass the top cover 22 through both ends of the cooling pipe 1 and install it on the base plate 21. Install the adapter structure on the outside of the top cover to complete the assembly of the battery pack.

[0072] The specific steps in S1 include the following:

[0073] Positioned by the support frame 24, multiple battery modules 23 with thermally conductive insulating adhesive are placed on the base plate 21, and the ends of the multiple battery modules 23 are pressed against the inner side of the support frame 24. The cooling pipe 1 is placed from top to bottom, so that the cooling pipe 1 is wrapped around both sides of the battery module 23.

[0074] The specific steps of S2 include the following:

[0075] The extrusion mechanism uses two sets of hydraulic cylinders to simultaneously extrude the cooling pipe 1 and the battery module 23 inward. After extrusion, side plates are installed on both sides of the base plate 21 to limit the extruded cooling pipe on both sides.

[0076] The specific steps of S3 include the following:

[0077] The sealing plate 41, connecting block 43, and connector 45 in the transition structure have been welded before assembly. The fixing plate 3 is installed inside 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 is then welded and fixed to the cooling pipe 1, and filler glue is injected into the glue injection groove 46. The upper cover 22 is fastened onto the base plate 21, and the sealing plate 41 and fixing plate 3 are connected by screws to complete the assembly.

[0078] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for installing a side-cooled battery pack, characterized in that, The method of using a one-piece molded cooling pipe includes the following steps: S1: The cooling pipes are arranged with multiple side pipes and end pipes in an alternating manner. First, multiple battery modules are placed on the base plate, and the same end of multiple battery modules is in contact with the inside of the support frame. Then, the cooling pipes are placed between multiple battery modules, so that the cooling pipes pass around both sides of each battery module in turn, and the end pipes are limited in height by the support frame. Some cooling pipes have two adjacent side pipes located between the same adjacent battery modules. The end pipe between the two adjacent side pipes is bent outward to form a ball head or square head. The two ends of the cooling pipe are located on the same side of the top cover. S2: Through the extrusion mechanism, the cooling pipe and battery module are simultaneously extruded inward from both sides of the base plate, so that the side wall of the cooling pipe contacts the side wall of the battery module. S3: Pass the top cover through both ends of the cooling pipe and install it on the base plate. Install two adapter structures on the outside of the top cover and connect them to both ends of the cooling pipe. Specifically, the adapter structure includes a connecting block, a sealing plate, and a connector. Weld the connecting block to the sealing plate and weld the connector to the connecting block to form the adapter structure. Sleeve the sealing plate in the adapter structure onto the cooling pipe through the first through hole and then weld it in place. Fill the glue injection groove in the connecting block with sealant. Install the U-shaped plate on the inside of the top cover using the first fastener. The receiving groove is located on the inside of the top cover. Fasten the top cover onto the base plate. Connect the sealing plate and the receiving groove using the second fastener. The connecting block is located in the receiving groove.

2. The installation method of the side-cooled battery pack according to claim 1, characterized in that, A support frame is fixedly connected to the base plate in step S1. The cooling pipe is made of extruded aluminum square tube, which is bent multiple times to obtain the cooling pipe; the cooling pipe has multiple side tubes and end tubes arranged alternately, and the connection between the side tubes and end tubes is rounded. The side tubes correspond to the side of each battery module, and the end tubes correspond to the end of each battery module.

3. The installation method of the side-cooled battery pack according to claim 1, characterized in that, In step S1, thermally conductive insulating adhesive is bonded to both sides of each battery module, and the thermally conductive insulating adhesive pre-positions the cooling pipe.

4. The installation method of the side-cooled battery pack according to claim 1, characterized in that, In step S2, after extrusion is completed, side plates are installed on both sides of the base plate to perform secondary limiting on both sides of the extruded cooling pipe.

5. The installation method of the side-cooled battery pack according to claim 1, characterized in that, Both the first and second fasteners are sealing screws.

6. A battery pack, characterized in that, The installation is carried out by the side-cooled battery pack installation method as described in any one of claims 1-5, including a base plate, a top cover and multiple battery modules, the multiple battery modules are mounted on the base plate, and also includes a side-cooling structure, the side-cooling structure including a connecting structure and an integrally formed cooling pipe, the cooling pipe is wound around each battery module one by one and contacts both sides of each battery module; The two adapter structures are respectively installed at both ends of the cooling pipe and extend out of the side wall of the upper cover, and are detachably connected to the upper cover; the two ends of the cooling pipe are respectively connected to the liquid inlet pipe and liquid outlet pipe of the refrigeration equipment through the corresponding adapter structures.

7. The battery pack according to claim 6, characterized in that: The adapter structure includes a sealing plate and a connector. The sealing plate has a first through hole, through which the cooling pipe passes and is fixedly connected to the sealing plate. The connector is connected to the end of the cooling pipe. A fixing plate is fixedly connected to the side wall of the upper cover. A second through hole is provided on the fixing plate. The sealing plate is pressed against the inner side of the fixing plate. The end of the cooling pipe passes through the second through hole and is fixedly connected to the connector, so that the connector is located on the outer side of the fixing plate. The adapter structure also includes a connecting block, which is fixedly connected to the sealing plate and extends out through the second through hole. The connecting block has a communicating cavity, through which the cooling pipe communicates with the connector. The inner side of the connecting block has an injection groove around the cooling pipe, and the injection groove is filled with sealant.

8. The battery pack according to claim 7, characterized in that: The fixing plate includes a U-shaped plate and a receiving groove. The U-shaped plate is installed on the inner wall of the upper cover by screws. The receiving groove is located on the inner side of the upper cover and is pressed against the sealing plate. The receiving groove is fixedly connected to the inner wall of the U-shaped plate and connected to the sealing plate by screws. The second through hole is located on the receiving groove. The connecting block passes through the second through hole and is located in the receiving groove.

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