Installation method of side cold battery pack and battery pack

Abstract

The invention belongs to the technical field of energy storage equipment, and particularly relates to a side cold battery pack mounting method which comprises the following steps: S1, placing a plurality of battery modules and cooling pipes on a bottom plate, and enabling the cooling pipes to sequentially bypass two sides of each battery module; s2, synchronously and inwards extruding the cooling pipe and the battery module from the two sides of the bottom plate through an extrusion mechanism, so that the side wall of the cooling pipe is in contact with the side wall of the battery module; s3, the upper cover penetrates through the two ends of the cooling pipe and is installed on the bottom plate, and the two switching structures are installed on the outer side of the upper cover and connected with the two ends of the cooling pipe; the invention further relates to a side cold battery pack. By adopting the battery pack and the mounting method, the battery pack has the advantages of high assembly efficiency, good heat dissipation effect, low liquid leakage risk and low possibility of condensation.

Description

Technical Field

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

[0002] Existing side-cooled battery packs, by setting multiple cold plates on the side of the battery module (the battery module is composed of multiple battery cells), are closer to the heating area of ​​the battery module (the chemical reaction inside the battery cell and the current in and out of the tabs make the middle and upper parts of the battery module generate more heat), compared to the solution of setting the cold plate at the bottom of the battery module, thereby improving the heat dissipation effect.

[0003] However, when installing an existing side-cooled battery pack, the following steps are required: placing multiple battery modules on a base plate and positioning them through 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 branches at the liquid inlet and outlet ends of the battery pack, and welding the branches to the adapters.

[0004] During the above installation process, the connections of the cold plate, joints, and branch pipes all need to be welded. A large number of welding points will not only lead to a longer assembly time, but also make the welding positions prone to leakage, thereby increasing the risk of leakage in 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 more cumbersome. 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 installing a side-cooled battery pack. The method is used to assemble the battery pack, which has high assembly efficiency and low risk of battery pack leakage.

[0006] The technical solution adopted by the present invention is as follows: A method for installing a side-cooled battery pack, using an integrally formed cooling tube, comprises the following steps: S1: placing multiple battery modules and cooling pipes on a bottom plate so that the cooling pipes pass around two sides of each battery module in turn; S2: The cooling tube and the battery module are squeezed inward from both sides of the bottom plate by the extrusion mechanism, so that the side wall of the cooling tube contacts the side wall of the battery module; S3: Pass the upper cover through the two ends of the cooling pipe and install it on the bottom plate. Install the two transfer structures on the outside of the upper cover and connect them to the two ends of the cooling pipe.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. Since the cooling tube is integrally formed, the part inside the battery pack does not require welding or joints, and is not prone to leakage, thus reducing the risk of leakage and preventing short circuit of the battery cell due to coolant leakage; 2. When installing the battery pack, only the cooling pipe and the transfer structure need to be assembled. After the cooling pipe is placed on the bottom plate, the connection between the two transfer structures and the cooling pipe can be welded, with only two welding points. The connection between the transfer structure and the upper cover can be bolted. Compared with the parallel side cooling structure, the number of welding points is greatly reduced, the assembly is more convenient, and it is easier to disassemble during maintenance; 3. In step S2, due to the synchronous extrusion on both sides, even if the lateral placement of the battery module is misaligned during each installation, it will not affect the position after extrusion, thus saving the positioning time of the battery module before extrusion.

[0008] 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; the cooling tube is staggered with multiple side tubes and end tubes, and the connection between the side tubes and the end tubes is rounded, the side tubes correspond to the sides of each battery module, and the end tubes correspond to the ends of each battery module.

[0009] Beneficial effects: 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 equipment 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.

[0010] As a preferred embodiment of the present invention, a support frame is fixedly connected to the bottom plate. In step S1, First, multiple battery modules are placed on the bottom plate, and the same ends of the multiple battery modules are in contact with the inner side of the support frame. Then, cooling pipes are placed between the multiple battery modules, and the end pipes are limited in height by the support frame.

[0011] Beneficial effects: During assembly, the support frame can position the battery module and the cooling pipe. When the cooling pipe is made of aluminum pipe, it can be extruded and shaped by an extrusion device (hydraulic cylinder or air cylinder). The support frame limits the height direction of the cooling pipe and the end of the battery module. The extrusion devices on both sides of the bottom plate can ensure the relative position of the cooling pipe and the battery module when extruding the cooling pipe and the battery module, so that the cooling pipe is close to the middle and upper part of the battery module (the area where the battery module generates more heat).

[0012] As 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 is used to pre-position the cooling pipe.

[0013] Beneficial effects: 1. By setting the thermal conductive insulating glue, 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 the thermal conductive insulating glue is not used, the cooling pipe may rebound after extrusion; 2. During installation, first adhere thermally conductive insulating glue to the side wall of each battery module, and then place the cooling tube. After extrusion by the extrusion device, the cooling tube is extruded on the side wall of the battery module and adhered to the thermally conductive insulating glue. Since the side of the battery module is not a complete plane (the side wall of the battery cell has a chamfer, and there may be a certain misalignment between the battery cells), the gap between the cooling tube and the side wall of the battery module can be filled with thermally conductive insulating glue (the air in the gap will affect the heat exchange efficiency between the battery cell and the cooling tube), thereby ensuring the heat dissipation effect.

[0014] As a preferred embodiment of the present invention, in step S2, After the extrusion is completed, side plates are installed on both sides of the bottom plate to perform secondary positioning on both sides of the extruded cooling pipe.

[0015] Beneficial effect: By setting the side plate to limit the cooling pipe, it is prevented from rebounding and causing the cooling pipe to detach from the side wall of the battery module.

[0016] 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 through fasteners; the upper cover is buckled on the bottom plate, and the sealing plate and the fixing plate are connected through fasteners.

[0017] Beneficial effect: Since the risk of leakage is highest at the connection between the connector and the cooling tube (leakage occurs 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. 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.

[0018] As a preferred embodiment of the present invention, the fastener is a sealing screw.

[0019] Beneficial effects: 1. The sealing screw can ensure the sealing of the battery pack; 2. The cooling pipe in the scheme is made of aluminum tube, which can undergo plastic deformation under the action of a certain external force. When tightening the screws between the sealing plate and the receiving groove, the slight deviation of the sealing plate and the cooling pipe (due to processing errors caused by processing and extrusion) can be corrected due to the continuous tightening of the screws.

[0020] The second object of the present invention is to provide a battery pack, which is installed by the above-mentioned side-cooled battery pack installation method, including a base plate, an upper cover and multiple battery modules, the multiple battery modules are installed on the base plate, and also includes a side cooling structure, the side cooling structure includes a transfer structure and an integrally formed cooling pipe, the cooling pipe is wound along each battery module one by one, and contacts with both sides of each battery module; the two transfer structures are respectively installed at the two ends of the cooling pipe, and both extend out of the side wall of the upper cover, 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 through the corresponding transfer structures.

[0021] Compared with the prior art, the beneficial effects of the present invention are 1. The liquid inlet pipe, cooling pipe, and liquid outlet pipe form a series structure. The coolant in the cooling pipe no longer needs to be diverted, ensuring uniform flow through each battery module and uniform temperature in the battery pack. The welding points of the transfer structure are located on the outside of the battery pack, which reduces the risk of leakage in the cooling pipe in the battery pack.

[0022] 2. The cooling pipe is close to the side of the battery module and closer to the main heating area of ​​the battery module. Therefore, compared with the bottom cooling solution, when the battery module has the same heat generation, the temperature of the coolant in the cooling pipe can be higher when it enters, achieving the same cooling effect, reducing the power of the compressor and reducing energy consumption; 3. Since the condensation phenomenon is related to the ambient temperature and humidity, when the refrigeration equipment is working, the overall temperature of the coolant in the liquid inlet pipe, liquid outlet pipe and cooling pipe increases, which can reduce the risk of condensation and avoid battery cell short circuit and shell corrosion caused by condensed water.

[0023] As a preferred embodiment of the present invention, 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 connected to the end of the cooling pipe; The upper cover side wall is fixedly connected with a fixing plate, a second through hole is opened on the fixing plate, the sealing plate is pressed tightly 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 with the joint, so that the joint is located outside the fixing plate.

[0024] Beneficial effect: Since the risk of leakage is highest at the connection between the connector and the cooling pipe (leakage occurs during welding), the sealing plate is close to the fixed plate, blocking the second via hole, ensuring the sealing inside the battery pack, and placing the connector on the outside of the sealing plate, that is, the outside of the battery pack, reducing the risk of leakage inside the battery pack.

[0025] 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.

[0026] 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.

[0027] As a preferred embodiment of the present invention, a glue injection groove is provided on the inner side of the connection block around the cooling pipe, and the glue injection groove is filled with sealant.

[0028] Beneficial effect: By setting the glue injection groove and injecting the sealant, the sealant can bond the sealing plate, the connecting block and the cooling pipe to make the connection more stable, and can also block the gap between the cooling pipe and the connecting block to ensure the sealing performance.

[0029] As a preferred embodiment of the present invention, the fixing plate includes a circular plate and a receiving groove, the circular plate is mounted 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 circular plate and is 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.

[0030] Beneficial effects: 1. 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. If the connection block and the connector are directly arranged outside the side wall of the upper cover, the cabinet door cannot be closed. In this solution, the connection block is located in the receiving groove, so that the transfer structure does not have many protruding parts relative to the upper cover, occupies less external space, and is more beautiful; 2. The cooling pipe in the scheme is made of aluminum tube, which can undergo plastic deformation under the action of a certain external force. When tightening the screws between the sealing plate and the receiving groove, the slight deviation of the sealing plate and the cooling pipe (due to the processing error caused by processing and extrusion) can be corrected due to the continuous tightening of the screws; 3. The upper cover, the fixing plate, the receiving groove and the sealing plate form a sealed shell, so that the connecting block is located on the outside of the sealed 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 shell, thereby reducing the risk of leakage in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the structure of a cooling tube in an embodiment of a battery pack of the present invention; Figure 2 is a schematic diagram of the internal structure of a battery pack embodiment of the present invention; Figure 3 is a schematic structural diagram of a battery pack embodiment of the present invention; Figure 4 is a schematic structural diagram of a fixing plate in an embodiment of a battery pack of the present invention; Figure 5 is a schematic structural diagram of a switching structure in an embodiment of a battery pack of the present invention; Figure 6 It is a flowchart of the steps of a method for installing a side-cooled battery pack of the present invention.

[0032] 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, 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Among them, see Figure 4 , Figure 5The 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.

[0039] Among them, see Figure 1 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.

[0040] 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.

[0041] See also Figure 6 The second object of the present invention is to provide a method for installing a side-cooled battery pack, which is applied to the battery pack described above and includes the following steps: S1: placing a plurality of battery modules 23 and cooling tubes 1 on the bottom plate 21, so that the cooling tubes 1 pass through both sides of each battery module 23 in sequence; S2: The cooling tube 1 and the battery module 23 are simultaneously squeezed inward from both sides of the bottom plate 21 by the squeezing mechanism, so that the side wall of the cooling tube 1 contacts the side wall of the battery module 23; S3: Pass the upper cover 22 through the two ends of the cooling tube 1 and install it on the bottom plate 21, install the adapter structure on the outside of the upper cover, and complete the assembly of the battery pack.

[0042] The specific steps of S1 are as follows: The support frame 24 is used for positioning, and multiple battery modules 23 with thermally conductive insulating adhesive are placed on the bottom plate 21, and the ends of the multiple battery modules 23 are pressed against the inner side of the support frame 24, and the cooling pipe 1 is placed from top to bottom, so that the cooling pipe 1 is wound around both sides of the battery module 23; The specific steps of S2 include the following: The extrusion mechanism uses two groups of hydraulic cylinders to simultaneously extrude the cooling tube 1 and the battery module 23 inward. After the extrusion is completed, side plates are installed on both sides of the bottom plate 21 to limit the two sides of the extruded cooling tube.

[0043] The specific steps of S3 are as follows: The sealing plate 41, the connecting block 43 and the joint 45 in the transition structure have been welded before assembly. The fixing plate 3 is installed on the inner side of the upper cover 22 by screws, and 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 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.

[0044] 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 installing a side-cooled battery pack, characterized in that: The one-piece cooling pipe is used, and the following steps are included: S1: placing multiple battery modules and cooling pipes on a bottom plate so that the cooling pipes pass around two sides of each battery module in turn; S2: The cooling tube and the battery module are squeezed inward from both sides of the bottom plate by the extrusion mechanism, so that the side wall of the cooling tube contacts the side wall of the battery module; S3: Pass the upper cover through the two ends of the cooling pipe and install it on the bottom plate. Install the two transfer structures on the outside of the upper cover and connect them to the two ends of the cooling pipe.

2. The method for installing a side-cooled battery pack according to claim 1, characterized in that: The bottom plate is fixedly connected with a support frame. In step S1, 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; the cooling tube is staggered with multiple side tubes and end tubes, and the connection between the side tubes and the end tubes is rounded. The side tubes correspond to the sides of each battery module, and the end tubes correspond to the ends of each battery module.

3. The method for installing a side-cooled battery pack according to claim 2, characterized in that: In step S1, First, multiple battery modules are placed on the bottom plate, and the same ends of the multiple battery modules are in contact with the inner side of the support frame. Then, cooling pipes are placed between the multiple battery modules, and the end pipes are limited in height by the support frame.

4. The method for installing a 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 is used to pre-position the cooling pipe.

5. The method for installing a side-cooled battery pack according to claim 1, characterized in that: In step S2, After the extrusion is completed, side plates are installed on both sides of the bottom plate to perform secondary positioning on both sides of the extruded cooling pipe.

6. The method for installing a side-cooled battery pack according to claim 1, characterized in that: Wherein step S3 specifically comprises: 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 fixed by welding, and the sealing glue is filled in the glue injection groove in the connection block; Install the fixing plate on the inner side of the upper cover by fasteners; The upper cover is buckled onto the bottom plate, and the sealing plate and the fixing plate are connected by fasteners.

7. The method for installing a side-cooled battery pack according to claim 5, characterized in that: The fastener is a sealing screw.

8. A battery pack, characterized in that: The side-cooled battery pack is installed by the installation method according to any one of claims 1 to 7, comprising a bottom plate, an upper cover and a plurality of battery modules, wherein the plurality of battery modules are installed on the bottom plate, and further comprising a side-cooling structure, wherein the side-cooling structure comprises a transfer structure and an integrally formed cooling pipe, wherein the cooling pipe is wound along each battery module one by one and contacts with both sides of each battery module; The two transfer structures are respectively installed at the two ends of the cooling pipe, and both 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 the liquid outlet pipe of the refrigeration equipment through the corresponding transfer structures.

9. The battery pack according to claim 8, characterized in that: The transfer 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 the end of the cooling pipe; The upper cover side wall is fixedly connected with a fixing plate, the fixing plate is provided with a second through hole, the sealing plate is pressed tightly 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 with the joint, so that the joint is located on the outer side of the fixing plate; The transfer structure also 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; a glue injection groove is provided on the inner side of the connecting block around the cooling pipe, and the glue injection groove is filled with sealant.

10. The battery pack according to claim 9, characterized in that: The fixing plate includes a circular plate and a receiving groove, the circular 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 circular plate and is 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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