Highly efficient cooling battery pack case with high sealing property and manufacturing method

Abstract

The application discloses a battery pack box with high cooling efficiency and high sealing performance and a manufacturing method thereof. The battery pack box comprises a frame and a liquid cooling plate. The liquid cooling plate is arranged on the inner side of the frame. The outer periphery contour of the upper surface of the liquid cooling plate extends upwards and forms a lateral enclosure. The lateral enclosure and the liquid cooling plate form a battery cavity for accommodating a battery. The lateral enclosure is in thermal conduction with the liquid cooling plate and the battery cavity. The lateral enclosure extends to the top of the frame and is connected to the frame. A heat insulation piece is arranged between the lateral enclosure and the frame to insulate the heat transfer between the lateral enclosure and the frame. The lateral enclosure which extends integrally can increase the air tightness of the battery cavity. The lateral enclosure increases the heat exchange area and improves the cooling effect. The heat insulation piece can reduce the heat transfer between the battery cavity and the frame and reduce the energy loss.

Description

Technical Field

[0001] This invention belongs to the field of new energy battery boxes, and specifically relates to a battery pack box with high efficiency cooling and high sealing performance and its manufacturing method. Background Technology

[0002] With the rapid expansion of the market share of new energy vehicles, there have been numerous incidents of electric vehicles catching fire during charging or driving. A significant portion of these incidents are due to: fast charging causing a rapid rise in battery cell temperature, exceeding the battery's safe operating temperature and leading to fire; minor impacts or scrapes on the bottom during driving causing welding cracks that lead to airtight failure of the battery pack; and driving through water in rainy weather causing water to enter the pack, resulting in short circuits and potentially causing fires.

[0003] It is evident that the main causes of safety accidents involving new energy vehicles are, on the one hand, the ineffective loss of cooling energy from the battery cavity to the outside through the frame, resulting in poor cooling effect inside the battery cavity; on the other hand, the cracking of the weld between the liquid cooling plate and the frame causes the airtightness of the battery cavity to fail.

[0004] Therefore, in order to solve the above-mentioned technical problems, the present invention provides a battery pack housing with high efficiency cooling and high sealing performance, and a manufacturing method thereof. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a battery pack housing with high efficiency cooling and high sealing performance and a manufacturing method thereof. The airtightness of the battery cavity can be increased by the integrally extended lateral enclosure, and the lateral enclosure increases the heat exchange area to improve the cooling effect. Furthermore, the heat insulation component can reduce the heat transfer between the battery cavity and the frame, thereby reducing energy loss.

[0006] Technical solution: To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A high-efficiency cooling and highly sealed battery pack housing includes a frame and a liquid cooling plate. The liquid cooling plate is disposed inside the frame, and the outer periphery of the upper surface of the liquid cooling plate extends upward to form a lateral enclosure. The lateral enclosure and the liquid cooling plate form a battery cavity for accommodating the battery. The lateral enclosure conducts heat with both the liquid cooling plate and the battery cavity. The lateral enclosure extends to the top of the frame and is connected to the frame. A heat insulation element is disposed between the lateral enclosure and the frame to isolate heat transfer between the lateral enclosure and the frame.

[0008] Furthermore, a bottom protective plate is provided at the bottom of the frame, and a heat-insulating buffer pad is provided between the liquid cooling plate and the bottom protective plate. The heat-insulating buffer pad isolates the heat transfer between the liquid cooling plate and the bottom protective plate.

[0009] Furthermore, the heat insulation component and the heat insulation buffer pad together form a heat insulation cavity, and the liquid cooling plate is correspondingly disposed inside the heat insulation cavity.

[0010] Furthermore, the liquid cooling plate is a blown plate, the liquid cooling plate includes a lower plate and an upper plate, the lower plate and the upper plate contain a cooling channel for the flow of cooling medium, and the lateral enclosure is integrally formed by the outer periphery of the upper plate extending upward.

[0011] Furthermore, the lateral enclosure includes a heat-conducting side plate located inside the battery cavity and a fixed end plate located outside the battery cavity. The mounting end plate is located on the upper surface of the frame, and the heat-conducting side plate and the heat insulation component are spaced apart to form a heat insulation cavity.

[0012] Furthermore, the heat insulation cavity is an annular cavity structure. In the lateral direction of the battery box, the heat insulation cavity simultaneously forms a compensation space for heat insulation and deformation buffer between the heat-conducting side plate and the frame, and a filler is provided inside the heat insulation cavity.

[0013] Furthermore, an annular sealing membrane is provided inside the heat insulation cavity. The inner end of the sealing membrane is sealed and connected to the heat-conducting side plate, and the outer end of the sealing membrane is sealed and connected to the heat insulation component. The sealing membrane is sealed and tucked at the bottom of the heat insulation cavity, and the filler is placed above the sealing membrane.

[0014] Furthermore, the filler comprises an elastic enclosure and a fire-extinguishing and flame-retardant filler. The elastic enclosure is a closed body with an internal cavity structure. The inner cavity of the elastic enclosure is filled with the fire-extinguishing and flame-retardant filler. In the event of a fire, the elastic enclosure is flammable or cracks due to heat, causing the fire-extinguishing and flame-retardant filler to escape. An ignition port is provided on the heat-conducting side plate. In the event of a fire, the flame in the battery cavity can enter the heat insulation cavity and release the fire-extinguishing and flame-retardant filler. The released fire-extinguishing and flame-retardant filler enters the battery cavity through the ignition port to extinguish the fire.

[0015] Furthermore, the fixed end plate is fixedly disposed on the upper surface of the frame; the heat insulation component includes a lateral heat insulation plate parallel to and spaced apart from the heat-conducting side plate and a bottom heat insulation plate corresponding to the bottom of the liquid cooling plate, and the liquid cooling plate is movably contacted with the bottom heat insulation plate in the lateral direction;

[0016] The liquid cooling plate and the heat-conducting side plate have degrees of freedom in the lateral direction of the battery box, and can be elastically displaced in the lateral direction of the battery box relative to the fixed end plate.

[0017] A method for manufacturing a battery pack housing with high efficiency cooling and high sealing performance includes:

[0018] S1: Liquid cooling plates are blown and processed using a blow molding process according to requirements;

[0019] S2: The outer edge of the upper plate of the liquid cooling plate is drawn into a deep-drawn shape to obtain a lateral enclosure in the form of a enclosure. The lateral enclosure and the liquid cooling plate body form a battery cavity for accommodating the battery.

[0020] S3: Based on the load-bearing capacity requirements, set the cross-sectional shape of each edge beam of the frame, and open the mold to extrude the profile to obtain the edge beam;

[0021] S4: Connect the end-to-end beams of each side beam in series and fix them together to form a ring-shaped frame;

[0022] S5: Place heat-insulating components on the inner and upper side walls of the frame;

[0023] S6: The liquid cooling plate is placed inside the heat insulation component, and the top of the lateral enclosure is directly or indirectly fixed to the side wall of the frame. The heat-conducting side plate of the lateral enclosure is located in the battery cavity and the distance between it and the heat insulation component forms a heat insulation cavity.

[0024] S7: A bottom protective plate is provided at the bottom of the frame, and a thermal insulation buffer pad is placed between the bottom protective plate and the liquid cooling plate.

[0025] Beneficial effects: The outer periphery of the liquid cooling plate of the present invention extends upward in an integral manner to form a lateral surround, which is used to surround the outside of the battery pack. The integrally extended lateral surround can avoid welding, prevent deformation of the liquid cooling plate caused by welding and subsequent cracking, and the integral structure can increase the airtightness of the battery cavity.

[0026] The side surround is located on the outside of the battery pack and is integrated with the liquid cooling plate for heat transfer. During the cooling process, the side surround can also transfer heat with the battery pack, which can increase the heat exchange area and improve the cooling effect.

[0027] Furthermore, a heat insulation component is installed between the side enclosure and the frame. This component reduces heat transfer between the battery compartment and the frame, minimizing energy loss. Compared to the traditional structure where the liquid cooling plate and frame are in direct contact, this design effectively reduces heat exchange that occurs between the liquid cooling plate and the frame, and then to the outside environment, significantly improving heat dissipation efficiency. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0029] Appendix Figure 2 This is a schematic diagram of the frame assembly according to the first embodiment of the present invention;

[0030] Appendix Figure 3 This is an exploded view of the overall structure of the first embodiment of the present invention;

[0031] Appendix Figure 4 This is an exploded view of the overall structure of the second embodiment of the present invention;

[0032] Appendix Figure 5 This is a half-sectional schematic diagram of the second embodiment of the present invention;

[0033] Appendix Figure 6 This is an enlarged structural diagram of part A in the second embodiment of the present invention;

[0034] Appendix Figure 7 This is a schematic diagram showing the positions of the frame, liquid cooling plate, heat insulation component, and filler in the second embodiment of the present invention;

[0035] Appendix Figure 8 This is a schematic diagram of the structure of the filler of the present invention;

[0036] Appendix Figure 9 This is another embodiment of the method by which the sealing film of the present invention is disposed in the heat insulation cavity. Detailed Implementation

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] As attached Figure 1 To be continued Figure 3 As shown, the first embodiment:

[0039] A high-efficiency cooling and highly airtight battery pack housing includes a frame 1 and a liquid cooling plate 2. The liquid cooling plate 2 is disposed inside the frame, and the outer periphery of the upper surface of the liquid cooling plate 2 extends integrally upward to form a lateral surround 3. This lateral surround surrounds the outside of the battery pack. Compared to the traditional method of welding the liquid cooling plate to the frame, the integrally extended lateral surround avoids welding the liquid cooling plate to the frame, preventing deformation and subsequent cracking of the liquid cooling plate caused by welding. The integral structure increases the airtightness of the battery cavity. It also avoids the cleanliness problems caused by dirt and powder that cannot be cleaned properly due to welding of the housing, reducing safety hazards inside the battery cavity.

[0040] The lateral enclosure 3 has a ring-shaped structure. The lateral enclosure 3 and the liquid cooling plate 2 together form a battery cavity for accommodating the battery. The lateral enclosure 3 conducts heat with the liquid cooling plate 2 and the battery cavity. The lateral enclosure is connected to the liquid cooling plate 2 to conduct heat, and the lateral enclosure can also conduct heat with the side of the battery pack, thereby increasing the heat exchange area and improving the cooling effect.

[0041] The lateral surround 3 extends to the top of the frame 1 and is fixedly connected to the frame 1, so that the liquid cooling plate is fixed to the frame by the lateral surround. A heat insulation component 4 is provided between the lateral surround 3 and the frame 1, and the heat insulation component 4 isolates the heat transfer between the lateral surround 3 and the frame 1. The heat insulation component between the lateral surround and the frame can reduce the heat transfer between the battery cavity and the frame, thereby reducing the ineffective loss of energy. Compared with the traditional structure in which the liquid cooling plate and the frame are in direct contact, this structure can effectively reduce the heat exchange from the liquid cooling plate to the frame and then to the outside, greatly improving the heat dissipation efficiency.

[0042] A bottom protective plate 21 is provided at the bottom of the frame 1, and a heat-insulating buffer pad 22 is provided between the liquid cooling plate 1 and the bottom protective plate 21. The heat-insulating buffer pad isolates the liquid cooling plate from the bottom protective plate, reducing energy loss caused by ineffective heat transfer between the liquid cooling plate and the outside environment. The heat insulation component 4 and the heat-insulating buffer pad 21 together form a heat-insulating cavity, and the liquid cooling plate 2 is correspondingly disposed in the heat-insulating cavity. The heat-insulating cavity is used to isolate the liquid cooling plate from the frame and the bottom plate, reduce the loss of cold energy, and ensure efficient cooling of the battery cavity.

[0043] The liquid cooling plate 2 is a blown plate, which includes a lower plate 23 and an upper plate 24. The outer contour of the lower plate is smaller than that of the upper plate, and the spacing between the lower plates is set at the edge. The lower plate and the upper plate contain a cooling channel for the flow of cooling medium. The lower plate 23 has several flow channels that are shallowly drawn. The upper plate 24 has a smooth transition surface structure and is not drawn, forming a flat upper surface and lateral enclosure of the liquid cooling plate. The lateral enclosure 3 is integrally formed by extending the outer periphery of the upper plate 24 upward.

[0044] As attached Figure 4-9 The following is a second embodiment:

[0045] A high-efficiency cooling and highly sealed battery pack housing includes a frame 1 and a liquid cooling plate 2. The liquid cooling plate 2 is disposed on the inner side of the frame, and the outer periphery of the upper surface of the liquid cooling plate 2 extends upward to form a lateral enclosure 3. The lateral enclosure 3 and the liquid cooling plate 2 form a battery cavity for accommodating the battery. The lateral enclosure 3 conducts heat with both the liquid cooling plate 2 and the battery cavity. The lateral enclosure 3 extends to the top of the frame 1 and is connected to the frame. A heat insulation member 4 is disposed between the lateral enclosure 3 and the frame 1, and the heat insulation member 4 isolates the heat transfer between the lateral enclosure 3 and the frame 1.

[0046] A bottom protective plate 21 is provided at the bottom of the frame 1, and a heat insulation buffer pad 22 is provided between the liquid cooling plate 1 and the bottom protective plate 21. The heat insulation buffer pad isolates the heat transfer between the liquid cooling plate and the bottom protective plate.

[0047] The heat insulation component 4 and the heat insulation buffer pad 21 together form a heat insulation cavity, and the liquid cooling plate 2 is correspondingly arranged in the heat insulation cavity.

[0048] The liquid cooling plate 2 is a blown plate, which includes a lower plate 23 and an upper plate 24. The outer contour of the lower plate is smaller than that of the upper plate, and the spacing between the lower plates is set at the edge. The lower plate and the upper plate contain a cooling channel for the flow of cooling medium. The lateral enclosure 3 is integrally formed by extending the outer periphery of the upper plate 24 upward.

[0049] As attached Figure 6 and attached Figure 7 As shown, the lateral enclosure 3 includes a heat-conducting side plate 11 located inside the battery cavity and a fixed end plate 12 located outside the battery cavity. The fixed end plate 12 is disposed on the upper surface of the frame 1. The heat-conducting side plate 11 and the heat insulation component 4 are spaced apart to form a heat insulation cavity 5. The heat insulation cavity is an air cavity or a vacuum cavity. The heat insulation cavity maintains the distance between the heat-conducting side plate 11 and the frame and heat insulation component, and reduces the heat transfer efficiency and degree, thereby isolating the heat-conducting side plate from the frame.

[0050] This design includes front, rear, left, and right side beams 101, with skirts 102 on at least the left and right side beams. The front, rear, left, and right side beams are connected to the profile frame by corner fittings 103 to ensure strength. In terms of airtightness, compared to traditional splicing and welding structures, it avoids the risk of air leakage caused by welding defects such as arc welding porosity, because it is formed by deep drawing of a single plate, resulting in very high airtightness. In terms of strength, it reduces the strength attenuation caused by arc welding thermal stress, resulting in better overall strength. In addition, the skirts on the left and right side beams are designed to support the weight of the battery cells, preventing the weight of the battery cells from being completely applied to the liquid cooling plate, which could lead to the failure of the liquid cooling plate. In terms of size control, because the entire process involves cold connections such as gluing and screwing, there is no thermal deformation during manufacturing, making the size easy to control. The mounting holes of the battery box can be machined during component manufacturing, which simplifies the manufacturing process, saves manufacturing costs, and avoids the cleanliness problems caused by drilling holes after the box frame is assembled, which can result in dirt and aluminum shavings that cannot be cleaned.

[0051] The bottom plate of this structure is made of thin steel plate, which has better resistance to stone impacts compared to aluminum profile bottom plates, and can effectively reduce the risk of airtight failure caused by scratches during vehicle operation.

[0052] The fixed end plate 12 is fixed to the upper surface of the frame 1 by fasteners such as bolts. The heat insulation component 4 includes a lateral heat insulation plate 110 parallel to and spaced from the heat-conducting side plate 11 and a bottom heat insulation plate 111 corresponding to the bottom of the liquid cooling plate 2. The liquid cooling plate 2 is movably in contact with the bottom heat insulation plate 111 in the lateral direction. The liquid cooling plate 2 and the heat-conducting side plate 11 have degrees of freedom in the lateral direction of the battery box and can be elastically displaced in the lateral direction of the battery box relative to the fixed end plate 12. Therefore, after the battery box is subjected to a lateral impact, the heat insulation cavity 5 can also provide deformation compensation space, preventing the impact-deformed frame from intruding into the liquid cooling plate, preventing damage to the liquid cooling plate, and further preventing leakage of the liquid cooling plate, thereby further improving the safety of the battery box.

[0053] The heat insulation cavity 5 is an annular cavity structure, which can isolate heat transfer and protect the battery cavity from collisions in four directions: front, back, left, and right. In the lateral direction of the battery box, the heat insulation cavity 5 simultaneously forms a compensation space for heat insulation and deformation buffering between the heat-conducting side plate 11 and the frame 1. The heat insulation cavity 5 is provided with a filler 10, which includes one or more of the following: heat insulation filler, buffer filler, or fire-retardant filler, which can increase the heat insulation or fire extinguishing preset within the heat insulation cavity. The filler can enhance the heat insulation effect of the heat insulation cavity and provide a dual effect of buffering and shock absorption in the lateral direction of the liquid cooling plate.

[0054] When the liquid cooling plate is assembled into the inner side of the insulation component, the insulation cavity itself is relatively small, and the top of the liquid cooling plate includes a fixed end plate. When the liquid cooling plate is fully embedded into the inner side of the insulation component, the fixed end plate will close the top opening of the insulation cavity, preventing the filler from being inserted. Therefore, the filler needs to be inserted before the liquid cooling plate is fully embedded into the insulation component. At this time, there is a certain gap between the bottom of the liquid cooling plate and the bottom of the insulation component, as well as the skirt of the frame. If granular or powdered filler is inserted, it will leak out from this bottom gap. Therefore, to solve the above technical problem and ensure the installation of the filler, a sealing membrane needs to be installed between the heat-conducting side plate and the insulation component.

[0055] An annular sealing membrane 6 is provided inside the heat insulation cavity 5. The inner end of the sealing membrane 6 is sealed to the heat-conducting side plate 11, and the outer end of the sealing membrane 6 is sealed to the heat insulation component 4. The sealing membrane is sealed at the bottom of the heat insulation cavity 5, and the filler is placed above the sealing membrane. When the liquid cooling plate and the heat insulation component are assembled, the bottom of the liquid cooling plate is spaced between the edge skirt and the bottom heat insulation plate 111. At this time, the fixed end plate 12 is spaced between the top heat insulation plate 112 on the upper surface of the edge. The top heat insulation plate and the fixed end plate form the filler inlet of the filler. At this time, the sealing membrane 6 forms a seal between the bottom of the heat-conducting side plate 11 and the bottom of the heat insulation component 4. The sealing membrane holds the filler in the heat insulation cavity, preventing granular or powdery filler from entering the gap between the bottom of the liquid cooling plate and the bottom of the heat insulation component. At the same time, it can also prevent air or water from entering the heat insulation cavity from the bottom of the battery box.

[0056] The width of the inner and outer sides of the heat insulation film is greater than the height of the heat insulation cavity. Before the liquid cooling plate is assembled with the heat insulation component, the inner end of the heat insulation film is pre-welded to the heat-conducting side plate 11, and the outer end of the heat insulation film is welded to the lateral heat insulation plate 110.

[0057] As attached Figure 8 As shown, the filling material includes an elastic enclosure 7 and a fire-retardant filler 8. The elastic enclosure 7 is a closed body with an internal cavity structure. The enclosure 7 is made of flammable rubber material and is elastic. When the box is laterally impacted, it can play an elastic buffer role for the liquid cooling plate. The inner cavity of the elastic enclosure 7 is filled with the fire-retardant filler 8. In the event of a fire, the elastic enclosure 7 is flammable or cracks when heated, allowing the fire-retardant filler to escape. The heat-conducting side plate 11 has an ignition port 13. Preferably, the elastic enclosure is a high-temperature igniter with an ignition point above 100°C or around the battery fire temperature, which facilitates the flame to enter the insulation cavity from the ignition port. In the event of a battery fire, the flame in the battery cavity can enter the insulation cavity and release the fire-retardant filler. The fire-retardant filler is ammonium bicarbonate powder, which can generate a large amount of CO2 gas when heated, thus retarding and extinguishing the fire. The released fire-retardant filler enters the battery cavity from the ignition port to extinguish the fire, thereby improving safety.

[0058] As attached Figure 6 and attached Figure 7 In the first embodiment of the sealing membrane arrangement in the heat insulation cavity, the inner end 61 of the sealing membrane is located below the ignition port, and is suitable for granular fillers, and the filler particle size is larger than the ignition port. The outer end 62 of the sealing membrane is connected to the lateral heat insulation plate, preferably in the middle section.

[0059] Appendix Figure 9As shown, this is a second embodiment of the sealing film arrangement in the heat insulation cavity. The inner end 61 of the sealing film is located above the ignition port. When the filler is filled, the sealing film can seal the ignition port in the heat insulation cavity to prevent the powdered filler from entering the battery cavity. The outer end 62 of the sealing film is connected to the lateral heat insulation plate, preferably in the middle section.

[0060] In addition, a heat-insulating seal can be installed in the battery cavity corresponding to the ignition port. It is glued to the heat-conducting side plate to seal the ignition port, providing heat insulation and sealing. It is itself a flammable material. In the event of a fire, the heat-insulating seal can detach from the ignition port, allowing the ignition port to be in the open state, and the heat insulation cavity and the battery cavity to be connected.

[0061] A method for manufacturing a battery pack housing with high efficiency cooling and high sealing performance includes:

[0062] S1: Liquid cooling plates are blown and processed using a blow molding process according to requirements;

[0063] S2: The outer edge of the upper plate of the liquid cooling plate is drawn into a deep-drawn shape to obtain a lateral enclosure in the form of a enclosure. The lateral enclosure and the liquid cooling plate body form a battery cavity for accommodating the battery.

[0064] S3: Based on the load-bearing capacity requirements, set the cross-sectional shape of each edge beam of the frame, and open the mold to extrude the profile to obtain the edge beam;

[0065] S4: Connect the end-to-end beams of each side beam in series and fix them together to form a ring-shaped frame;

[0066] S5: Place heat-insulating components on the inner and upper side walls of the frame;

[0067] S6: The liquid cooling plate is placed inside the heat insulation component, and the top of the lateral enclosure is directly or indirectly fixed to the side wall of the frame. The heat-conducting side plate of the lateral enclosure is located in the battery cavity and the distance between it and the heat insulation component forms a heat insulation cavity.

[0068] S6.1: When assembling the liquid cooling plate and the heat insulation component, the bottom of the liquid cooling plate is spaced between the frame skirt and the bottom heat insulation plate 111. At this time, the fixed end plate 12 is spaced between the top heat insulation plate 112 on the upper surface of the frame. The top heat insulation plate and the fixed end plate form the filler inlet of the filler. The inner end of the heat insulation film is pre-welded to the heat-conducting side plate 11, and the outer end of the heat insulation film is welded to the lateral heat insulation plate 110. At this time, the bottom of the heat-conducting side plate 11 and the bottom of the heat insulation component 4 are sealed by the sealing film 6, and the filler in the heat insulation cavity is held by the sealing film.

[0069] S7: Add fire-extinguishing and flame-retardant filler with fire-extinguishing effect into the heat insulation cavity, and open an ignition hole on the heat-conducting side plate. The elastic package 7 is flammable or cracked by heat in the fire state, causing the fire-extinguishing and flame-retardant filler to escape. The fire-extinguishing and flame-retardant filler enters the battery cavity from the ignition hole to extinguish the battery fire.

[0070] S8: A bottom protective plate 21 is provided at the bottom of the frame, and a heat-insulating buffer pad is placed between the bottom protective plate and the liquid cooling plate.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery pack housing with high efficiency cooling and high sealing performance, characterized in that: Includes a frame (1) and a liquid cooling plate (2). The liquid cooling plate (2) is disposed inside the frame, and the outer periphery of the upper surface of the liquid cooling plate (2) extends upward to form a lateral enclosure (3). The lateral enclosure (3) and the liquid cooling plate (2) form a battery cavity for accommodating the battery. The lateral enclosure (3) conducts heat with both the liquid cooling plate (2) and the battery cavity. The lateral enclosure (3) extends to the top of the frame (1) and is connected to the frame. A heat insulation member (4) is provided between the lateral enclosure (3) and the frame (1). The heat insulation member (4) isolates the heat transfer between the lateral enclosure (3) and the frame (1). The lateral enclosure (3) includes a heat-conducting side plate (11) located inside the battery cavity and a fixed end plate (12) located outside the battery cavity. The fixed end plate (12) is set on the upper surface of the frame (1). The heat-conducting side plate (11) and the heat insulation member (4) are spaced apart and form a heat insulation cavity (5). The heat insulation cavity (5) is an annular cavity structure. In the lateral direction of the battery box, the heat insulation cavity (5) simultaneously forms a compensation space for heat insulation and deformation buffer between the heat-conducting side plate (11) and the frame (1). The heat insulation cavity (5) is provided with a filler (10). The filler (10) includes one or more of heat insulation filler, buffer filler or fire extinguishing and flame retardant filler, which can increase the heat insulation or fire extinguishing preset in the heat insulation cavity. An annular sealing membrane (6) is provided inside the heat insulation cavity (5). The inner end of the sealing membrane (6) is sealed and connected to the heat-conducting side plate (11), and the outer end of the sealing membrane (6) is sealed and connected to the heat insulation component (4). The sealing membrane is sealed and tucked at the bottom of the heat insulation cavity (5), and the filler (10) is placed above the sealing membrane (6). The filler (10) includes an elastic enclosure (7) and a fire-extinguishing and flame-retardant filler (8). The elastic enclosure (7) is a closed body with an internal cavity structure. The inner cavity of the elastic enclosure (7) is filled with fire-extinguishing and flame-retardant filler (8). The elastic enclosure (7) is flammable or cracks when heated in the fire state, allowing the fire-extinguishing and flame-retardant filler to escape. The heat-conducting side plate (11) is provided with an ignition port (13). The elastic enclosure (7) is a high-temperature igniter with an ignition point above 100°C or around the battery fire temperature. In the fire state, the flame in the battery cavity can enter the heat insulation cavity (5) and release the fire-extinguishing and flame-retardant filler (8). The released fire-extinguishing and flame-retardant filler (8) enters the battery cavity from the ignition port to extinguish the fire.

2. The battery pack housing with high efficiency cooling and high sealing performance according to claim 1, characterized in that: The bottom of the frame (1) is provided with a bottom guard plate (21), and a heat insulation buffer pad (22) is provided between the liquid cooling plate (2) and the bottom guard plate (21). The heat insulation buffer pad isolates the heat transfer between the liquid cooling plate and the bottom guard plate.

3. The battery pack housing with high efficiency cooling and high sealing performance according to claim 2, characterized in that: The heat insulation component (4) and the heat insulation buffer pad (22) together form a heat insulation cavity, and the liquid cooling plate (2) is correspondingly arranged in the heat insulation cavity.

4. The battery pack housing with high efficiency cooling and high sealing performance according to claim 1, characterized in that: The liquid cooling plate (2) is a blown plate. The liquid cooling plate (2) includes a lower plate (23) and an upper plate (24). A cooling channel for the flow of cooling medium is included between the lower plate and the upper plate. The lateral enclosure (3) is integrally formed by extending the outer periphery of the upper plate (24) upward.

5. The battery pack housing with high efficiency cooling and high sealing performance according to claim 1, characterized in that: The fixed end plate (12) is fixedly installed on the upper surface of the frame (1); the heat insulation component (4) includes a lateral heat insulation plate (110) parallel to and spaced from the heat-conducting side plate (11) and a bottom heat insulation plate (111) corresponding to the bottom of the liquid cooling plate (2), and the liquid cooling plate (2) is movably contacted with the bottom heat insulation plate (111) in the lateral direction. The liquid cooling plate (2) and the heat-conducting side plate (11) have degrees of freedom in the lateral direction of the battery box and can be elastically displaced in the lateral direction of the battery box relative to the fixed end plate (12).

6. The method for manufacturing a battery pack housing with high efficiency cooling and high sealing performance according to claim 1, characterized in that: include: S1: Liquid cooling plates are blown and processed using a blow molding process according to requirements; S2: The outer edge of the upper plate of the liquid cooling plate is drawn into a deep-drawn shape to obtain a lateral enclosure in the form of a enclosure. The lateral enclosure and the liquid cooling plate body form a battery cavity for accommodating the battery. S3: Based on the load-bearing capacity requirements, set the cross-sectional shape of each edge beam of the frame, and open the mold to extrude the profile to obtain the edge beam; S4: Connect the end-to-end beams of each side beam in series and fix them together to form a ring-shaped frame; S5: Place heat-insulating components on the inner and upper side walls of the frame; S6: The liquid cooling plate is placed inside the heat insulation component, and the top of the lateral enclosure is directly or indirectly fixed to the side wall of the frame. The heat-conducting side plate of the lateral enclosure is located in the battery cavity and the distance between it and the heat insulation component forms a heat insulation cavity. S7: A bottom protective plate is provided at the bottom of the frame, and a thermal insulation buffer pad is placed between the bottom protective plate and the liquid cooling plate.

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