Lightweight battery pack and vehicle

Abstract

The invention provides a light-weight battery pack and a vehicle. The light-weight battery pack further comprises a box body upper cover, a pressure relief heat exchange integrated part and a box body frame, and the box body upper cover, a sampling connection assembly, a battery cell group, the pressure relief heat exchange integrated part, the box body frame and a bottom protective plate are sequentially arranged in the vertical direction; exhaust channels and heat exchange channels are arranged in the pressure relief and heat exchange integrated part, exhaust holes are formed in the tops of the exhaust channels, the exhaust holes correspond to the pressure relief valves of the battery cell bodies, and the heat exchange channels and the exhaust channels are alternately arranged. According to the light-weight battery pack, through cooperation of the box body upper cover, the sampling connection assembly, the battery cell group, the pressure relief heat exchange integrated part, the box body frame and the bottom protection plate, the weight of the battery pack can be reduced in a mode of adjusting the structure and improving the integration level, and finally the purposes of reducing the weight of the whole vehicle, reducing the energy consumption of the whole vehicle, increasing the endurance mileage of the vehicle and reducing the endurance anxiety of a user are achieved; and the use experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a lightweight battery pack and a vehicle. BACKGROUND

[0002] With the rapid development of the new energy vehicle industry, the performance of power batteries, as the core components of electric vehicles, directly affects the vehicle's range, power performance and overall energy efficiency. Currently, mainstream electric vehicles generally use lithium-ion battery technology, which has significantly improved energy density, cycle life and safety, and can meet the basic needs of daily use.

[0003] In the prior art, a power battery is usually composed of multiple battery monomers to form a battery module, and then a complete battery pack is formed by series or parallel connection. To improve energy density, the battery monomers are usually made of high-nickel ternary materials or lithium iron phosphate materials as the positive electrode, and graphite or silicon-carbon composite materials as the negative electrode. At the same time, the battery pack usually needs to be equipped with a complex cooling system, a protection structure and a battery management system (BMS) to ensure the safety and stability of the battery during charging and discharging.

[0004] However, due to the high material density of the existing power battery, and the need for additional structural components and thermal management systems to ensure performance, the overall weight of the battery pack is large. This not only increases the kerb mass of the vehicle, affecting the range performance, but also brings higher load to the suspension system, braking system and other systems of the vehicle.

[0005] Therefore, it is necessary to design a lightweight battery pack to solve the above problems. SUMMARY

[0006] Therefore, in order to overcome the defects of the prior art, the present application provides a lightweight battery pack and a vehicle, which effectively solves the problem of large weight of the existing battery pack.

[0007] According to a first aspect of the present application, a lightweight battery pack is provided, comprising a sampling connection assembly, a cell group and a bottom guard plate, the cell group is composed of a plurality of cell bodies arranged, and a pressure relief valve of the cell body is arranged at the bottom of the cell body. The lightweight battery pack further comprises a box upper cover, a pressure relief heat exchange integrated piece and a box frame, the box upper cover, the sampling connection assembly, the cell group, the pressure relief heat exchange integrated piece, the box frame and the bottom guard plate are sequentially arranged along the vertical direction. The inside of the pressure relief heat exchange integrated piece is provided with an exhaust passage and a heat exchange passage, the top of the exhaust passage is provided with an exhaust hole, the exhaust hole corresponds to the pressure relief valve of the cell body, and the heat exchange passage and the exhaust passage are alternately arranged.

[0008] Preferably, the width of the cross section of the exhaust passage gradually increases along the exhaust direction.

[0009] Preferably, a glue-proof film is arranged between the exhaust hole and the pressure relief valve.

[0010] Preferably, the box frame comprises a frame part and a connecting beam part, the connecting beam part is clamped inside the frame part, and the outer side wall of the frame part is provided with a vehicle body connecting hole.

[0011] Preferably, the frame part is formed by extrusion welding of aluminum profile.

[0012] Preferably, the connecting beam part is made of non-metallic material, and a structural adhesive is arranged at the connecting position of the connecting beam part and the frame part.

[0013] Preferably, the top of the pressure relief heat exchange integrated piece is provided with a water inlet, a water outlet and an exhaust port, the heat exchange channel is connected with the water inlet and the water outlet, and the exhaust channel is connected with the exhaust port.

[0014] Preferably, the pressure relief heat exchange integrated piece is provided with a rivet position for interfacing with the connecting beam part.

[0015] Preferably, the box upper cover is made of non-metallic material, and one side of the box upper cover facing the sampling connecting assembly is provided with a support pad.

[0016] According to the second aspect of the present application, a vehicle is provided, wherein the vehicle comprises the lightweight battery pack as described above.

[0017] According to the lightweight battery pack of the present application, by cooperation of the box upper cover, the sampling connecting assembly, the cell group, the pressure relief heat exchange integrated piece, the box frame and the bottom guard plate, the weight of the battery pack can be reduced by structural adjustment and improved integration, so as to ultimately realize weight reduction of the whole vehicle, reduce energy consumption of the whole vehicle, improve vehicle mileage, reduce user range anxiety and improve user experience. By integrating the exhaust channel and the heat exchange channel in the pressure relief heat exchange integrated piece, the battery pack can solve the problem of bottom exhaust and improve the integration of the battery pack, save the original exhaust of the upper part of the cell, and also ensure the heat exchange quality, so that the box upper cover can directly fall on the sampling connecting assembly, thereby improving the integration. By adjusting the structure and material of the box upper cover and the box frame, the battery pack modal can be improved, the protection strength of the battery pack can be ensured, the weight of the battery pack can be further reduced, and the purpose of lightweight of the battery pack is achieved.

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 An exploded view of a lightweight battery pack according to an embodiment of the present application is shown; Figure 2 A structural schematic view of a box frame according to an embodiment of the present application is shown; Figure 3 A structural schematic view of a pressure relief heat exchange integrated piece according to an embodiment of the present application is shown; Figure 4 A side schematic view of a pressure relief heat exchange integrated piece combined with a cell body according to an embodiment of the present application is shown; Figure 5 A structural schematic view of a box upper cover according to an embodiment of the present application is shown.

[0021] Reference signs: 1 - box upper cover; 101 - support pad; 2 - sampling connection assembly; 3 - cell group; 301 - cell body; 302 - pressure relief valve; 303 - glue blocking film; 4 - pressure relief heat exchange integrated piece; 401 - exhaust passage; 402 - heat exchange passage; 403 - exhaust hole; 404 - rivet position; 405 - water inlet; 406 - water outlet; 407 - exhaust port; 408 - bearing surface; 5 - box frame; 501 - frame part; 502 - connecting beam part; 503 - vehicle body connecting hole; 6 - bottom guard plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] According to a first aspect of the present invention, a lightweight battery pack is provided, such as Figures 1 to 5 As shown, this lightweight battery pack is used in vehicles. By adjusting the integration of component structures, assembly methods, and selected materials, the weight of the battery pack is reduced while ensuring usage requirements are met, thereby improving the battery pack's performance. The lightweight battery pack includes a top cover 1, a sampling connection assembly 2, a cell assembly 3, a pressure relief heat exchange integration component 4, a housing frame 5, and a bottom protective plate 6.

[0027] In the following description, reference will be made to Figures 1 to 5 The detailed structure of the lightweight battery pack includes the top cover 1, sampling connection assembly 2, cell group 3, pressure relief heat exchange integration 4, housing frame 5, and bottom protective plate 6.

[0028] like Figure 1As shown, in this embodiment, the lightweight battery pack may include a sampling connection assembly 2, a cell group 3, and a bottom protective plate 6, all existing in the prior art. Multiple cell groups 3 can be arranged inside the battery pack. Each cell group 3 can be composed of multiple cell bodies 301, with a pressure relief valve 302 located at the bottom of each cell body 301. The sampling connection assembly 2 can connect multiple cell groups 3 to achieve current transmission and control. The bottom protective plate 6 is located at the bottom of the lightweight battery pack to protect its bottom. The bottom protective plate 6 can be installed on the bottom surface of the housing frame 5 using conventional threaded connections or welding. Since the sampling connection assembly 2, cell group 3, and bottom protective plate 6 are all existing components, they will not be described in detail in this embodiment. The structural improvements of this lightweight battery pack mainly lie in: the housing cover 1, the pressure relief heat exchange integration component 4, and the housing frame 5.

[0029] Specifically, such as Figure 1 As shown, the top cover 1, sampling connection assembly 2, battery cell assembly 3, pressure relief heat exchange integration 4, housing frame 5, and bottom protective plate 6 are arranged in sequence along the vertical direction. Here, the vertical direction can be understood as the direction perpendicular to the ground.

[0030] Furthermore, the internal structure of the pressure relief heat exchange integration component 4 is provided with an exhaust channel 401 and a heat exchange channel 402. An exhaust hole 403 is provided at the top of the exhaust channel 401. The exhaust hole 403 corresponds to the pressure relief valve 302 of the cell body 301. In order to achieve thermal and electrical separation in the battery pack, the pole direction of the cell body 301 should not be consistent with the pressure relief direction. Preferably, the opposite direction of the cell body 301 is used, that is, the pressure relief valve 302 is located at the bottom of the cell body 301. Correspondingly, in order to meet the bottom pressure relief requirement, a pressure relief channel, namely the exhaust channel 401, needs to be set at the bottom. The liquid cooling plate in the original battery pack is also set at the bottom of the cell group 3. Therefore, the pressure relief heat exchange integration component 4 integrates the exhaust channel 401 and the heat exchange channel 402 at the same time, which not only solves the bottom exhaust problem but also improves the integration of the pack, saves the exhaust at the top of the original cell, and also ensures the heat exchange quality. It also improves the Z-direction space (i.e., the vertical direction) of the battery pack, allowing the use of cell groups 3 with higher energy density. It also allows the top cover 1 of the box to fall directly on the sampling connection assembly 2.

[0031] Furthermore, such as Figure 4 As shown, in order to achieve the simultaneous integration of the exhaust channel 401 and the heat exchange channel 402, the pressure relief heat exchange integrated component 4 can be understood as being composed of three layers of plates stacked together. The top and bottom plates are flat to ensure flatness, and the middle plate, through its design, forms the exhaust channel 401 and the heat exchange channel 402 together with the top and bottom plates, respectively. Figure 3As shown, the exhaust channel 401 is designed to correspond to the pressure relief valve 302 of the cell body 301. Therefore, an exhaust hole 403 is provided at the top of the exhaust channel 401. Since each cell group 3 includes multiple cell bodies 301, the exhaust hole 403 can be formed as an elongated hole to facilitate the correspondence of multiple pressure relief valves 302. Each cell group 3 can correspond to one exhaust hole 403. The exhaust hole 403 is connected to the exhaust channel 401. The exhaust channel 401 does not have a complex loop. Multiple exhaust channels 401 can be straight channels and converge into a pipe. Gas can be discharged through the exhaust port 407 (see below) on this pipe.

[0032] Furthermore, to avoid interference and ensure the quality of heat exchange, the heat exchange channel 402 needs to be filled as completely as possible with the pressure relief heat exchange assembly 4. Therefore, the heat exchange channel 402 and the exhaust channel 401 are arranged alternately, which can also be understood as heat exchange channels 402 being provided on both sides of the exhaust channel 401. The pipe arrangement of the heat exchange channel 402 is relatively complex. It can be composed of multiple pipes with U-shaped ends spliced ​​together, or it can be composed of a single pipe with multiple U-shaped ends. The U-shaped ends can bypass the straight exhaust channel 401 and fill the pressure relief heat exchange assembly 4. However, it is not limited to this. The specific arrangement of the heat exchange channel 402 and the exhaust channel 401 can be appropriately selected according to needs, as long as the heat exchange channel 402 and the exhaust channel 401 are arranged alternately. There are no restrictions here.

[0033] This lightweight battery pack, through the cooperation of the top cover 1, sampling connection assembly 2, cell group 3, pressure relief heat exchange integration component 4, housing frame 5, and bottom guard plate 6, can reduce the weight of the battery pack by adjusting the structure and increasing the integration, ultimately achieving overall vehicle weight reduction, reducing vehicle energy consumption, increasing vehicle range, reducing user range anxiety, and improving the user experience. By integrating the exhaust channel 401 and heat exchange channel 402 into the pressure relief heat exchange integration component 4, the battery pack solves the bottom exhaust problem and improves the internal integration, saving the exhaust originally located on the top of the cells, while also ensuring the quality of heat exchange. This allows the top cover 1 to directly rest on the sampling connection assembly 2, further improving integration. By adjusting the structure and materials of the top cover 1 and housing frame 5, the battery pack mode can be improved, the protection strength of the battery pack can be ensured, and the weight of the battery pack can be further reduced, achieving the goal of lightweight battery pack.

[0034] Preferably, such as Figure 4 As shown, in this embodiment, the width of the cross-section of the exhaust channel 401 gradually increases along the exhaust direction. The exhaust direction can be understood as... Figure 4The cross-section of the exhaust channel 401, from top to bottom, can be trapezoidal. To ensure smooth exhaust while maximizing heat exchange quality and area, a gradient channel design is adopted. The gradient and cross-sectional change reduce airflow resistance and save the surface area occupied at the top, allowing the upper space to provide more heat exchange area for the heat exchange channel 402, thus improving the system's heat dissipation capacity. During processing, the inner wall of the exhaust channel 401 needs to be smooth to reduce frictional resistance and fluid kinetic energy loss, thereby achieving rapid pressure relief while ensuring rapid exhaust without complex loops in the exhaust channel 401.

[0035] Preferably, such as Figure 3 and Figure 4 As shown, in this embodiment, a barrier film 303 is disposed between the vent 403 and the pressure relief valve 302. The barrier film 303 covers the vent 403, preventing the thermally conductive structural adhesive from blocking the channel between the pressure relief valve 302 and the vent 403. The barrier film 303 is a soft, non-metallic material. The material of the barrier film 303 is one of polyethylene terephthalate, polyethylene, or polypropylene. Because polyethylene terephthalate, polyethylene, and polypropylene have good film-forming properties, they are easy to manufacture into the barrier film 303. This allows the barrier film 303 to provide good insulation against the thermally conductive structural adhesive while avoiding interference with the normal venting of the battery cell body 301.

[0036] Preferably, such as Figure 4 As shown, in this embodiment, the thickness of the resist film 303 is 1-3 mm. A resist film 303 with a thickness of 1-3 mm can effectively isolate the thermally conductive structural adhesive, while also allowing the gas emitted from the battery cell body 301 to melt and break through the resist film 303, thus avoiding any impact on the normal venting of the battery cell assembly 3. For example, the thickness of the resist film 303 can be set to 1 mm, 2 mm, or 3 mm. The specific thickness can be selected based on the temperature of the thermally conductive structural adhesive and the temperature of the gas emitted from the battery cell assembly 3, and is not limited here.

[0037] Preferably, such as Figure 3As shown in the embodiment, the top of the pressure relief heat exchange assembly 4 is provided with an inlet 405, an outlet 406, and an exhaust port 407. The heat exchange channel 402 is connected to the inlet 405 and the outlet 406, and the exhaust channel 401 is connected to the exhaust port 407. To avoid interference between the exhaust and heat exchange pipe arrangements, the inlet 405 and the outlet 406 are located at the same end of the pressure relief heat exchange assembly 4, and the exhaust port 407 is located at the other end of the pressure relief heat exchange assembly 4, which is located at the end with the inlet 405 and the outlet 406. There can be two exhaust ports 407, spaced apart, and each exhaust port 407 can be connected to one of the two exhaust channels 401. The exhaust port 407 is the only part of the lightweight battery pack that allows external ventilation, and pressure relief can be achieved through this point in case of thermal runaway of the battery cells. Preferably, an explosion-proof valve is installed at the exhaust port 407.

[0038] Preferably, such as Figure 3 As shown, in the embodiment, the pressure relief heat exchange integration component 4 is also provided with a bearing surface 408, which is used to support the battery cell assembly 3.

[0039] Preferably, such as Figure 3 As shown, in this embodiment, the pressure relief heat exchange assembly 4 has rivet positions 404 for mating with the connecting beam portion 502. During assembly, the pressure relief heat exchange assembly 4 is positioned on the connecting beam portion 502 via the rivet positions 404 to improve flatness and overall shape.

[0040] Preferably, such as Figure 2 As shown, in this embodiment, the box frame 5 includes a side frame portion 501 and a connecting beam portion 502. The connecting beam portion 502 is snapped into the interior of the side frame portion 501, and the outer side wall of the side frame portion 501 is provided with a vehicle body connection hole 503. The inner wall of the side frame portion 501 is provided with a slot, and the end of the connecting beam portion 502 is provided with a corresponding locking block. The side frame portion 501 and the connecting beam portion 502 are snapped together through the cooperation of the slot and the locking block. Furthermore, in this embodiment, in order to ensure the structural strength of the side frame portion 501, the connecting beam portion 502 is only... Figure 2 The three vertical beams in the middle, Figure 2 One of the crossbeams is the structure of the frame portion 501. The number of body connection holes 503 can be specifically set as needed. In this embodiment, four body connection holes 503 are provided at the front frame of the housing frame 5, three body connection holes 503 are provided at the rear frame, and five body connection holes 503 are provided on each of the left and right sides. Specifically, the housing frame 5 can be formed into an approximately cuboid structure and cooperate with the battery cell assembly 3, which is also formed into an approximately cuboid structure. Multiple receiving positions are formed between the frame portion 501 and the connecting beam portion 502 for receiving the battery cell assembly 3. In addition, a sealing gasket is provided on the upper periphery of the housing frame 5. The housing cover 1 is connected to the housing frame 5 at this point by bolts. After connection, the sealing gasket is pressed tight to complete the sealing of the battery pack.

[0041] Preferably, such as Figure 2 As shown, in this embodiment, the frame portion 501 is formed by extrusion welding of aluminum profile. The extruded aluminum profile constitutes the outer frame of the battery pack, and the outer frame is formed by welding to form the frame portion 501. To ensure the sealing of the frame portion 501, all welds are full welds.

[0042] Preferably, such as Figure 2 As shown, in this embodiment, the connecting beam 502 is made of non-metallic material, and structural adhesive is provided at the connection between the connecting beam 502 and the frame 501. The connecting beam 502, located inside the frame 501, is made of non-metallic material. The non-metallic beam is connected to the frame 501 by structural adhesive and a snap-fit ​​structure. While ensuring the structural strength of the battery, this effectively improves the insulation performance of the entire pack and reduces the weight of the box.

[0043] The frame 501 of the housing frame 5 is made of aluminum profile, while the connecting beam 502 located inside the frame 501 is made of non-metallic material. This design effectively reduces the weight of the housing compared to the original steel housing while maintaining the structural strength of the battery. The non-metallic material used in the connecting beam 502 improves the overall insulation performance and reduces the area of ​​insulation material bonding, thus reducing battery weight and manufacturing costs. The non-metallic longitudinal beams can be connected to the aluminum profile frame 501 via riveting or snap-fitting.

[0044] Preferably, such as Figure 5 As shown, in this embodiment, the top cover 1 of the battery pack is also made of a non-metallic material, and a support pad 101 is provided on the side of the top cover 1 facing the sampling connection assembly 2. The top cover 1, made of a non-metallic material, significantly reduces the weight of the battery pack, thereby improving the vehicle's range and handling performance.

[0045] Preferably, such as Figure 1 and Figure 5 As shown in the embodiment, a support pad 101 is located below the top cover 1 of the housing. The support pad 101 can be directly mounted on the sampling connection assembly 2, thereby forming a complete Z-axis support (vertical direction), which can provide excellent load-bearing capacity for the upper part of the battery pack and realize a battery pack load-bearing structure that can be directly stepped on by a person. In addition, the housing top cover 1 made of non-metallic material can reduce the risk of fire and explosion of the battery pack. Since metal may cause short circuits or overheating in some cases, non-metallic materials generally have better electrical insulation properties, which can effectively improve the safety of the battery pack. The support pad 101 is made of insulating material, preferably EPP material, which has compressible properties. The housing top cover 1 is connected to the housing frame 5 by bolts.

[0046] Preferably, in this embodiment, the thickness of the top cover 1 is 4-6 mm. The support pad 101 is bonded to the inside of the top cover 1 using acrylic pressure-sensitive adhesive and faces the battery cell body 301. The peel force of the pressure-sensitive adhesive is greater than 4 N / cm to ensure connection strength. Multiple support pads 101 are used, and these pads need to cover the area stepped on by the driver. The inside of the top cover 1 is sprayed with fire-retardant paint to improve its fire-retardant and insulating properties.

[0047] Preferably, in the embodiment, the bottom protective plate 6 is also made of a non-metallic material.

[0048] Preferably, the non-metallic material is resin fiber or carbon fiber.

[0049] The assembly process of this lightweight battery pack is as follows: First, the lower tray of the battery needs to be assembled. The lower tray here refers to the power battery lower housing assembly formed by the pressure relief heat exchange integrated component 4, the housing frame 5, and the bottom protective plate 6.

[0050] Secondly, the housing frame 5 and the pressure relief heat exchanger integration 4 are connected by friction stir welding. Specifically, the housing frame 5 is inverted so that its lower surface faces upwards, and the pressure relief heat exchanger integration 4 is also inverted and placed on top of the housing frame 5. At this time, the outermost edge of the pressure relief heat exchanger integration 4 overlaps with the outermost aluminum profile frame of the housing frame 5, keeping the overlap flat. Then, the two are welded together by friction stir welding, ensuring the airtightness of the connection. The pressure relief heat exchanger integration 4 has three rows of rivet positions 404, which are tightened with the three connecting beams 502 by blind rivets, which can improve the overall modality and improve the performance of the pressure relief heat exchanger integration 4 under load, such as flatness. The bottom guard plate 6 is set at the bottom of the housing frame 5 to enhance the battery pack's ability to withstand bottom impacts.

[0051] Furthermore, the exhaust channel 401 and heat exchange channel 402 of the pressure relief heat exchange integration component 4 are arranged alternately, with the battery cell assembly 3 depressurized downwards and the electrical connection located above, thereby achieving thermoelectric separation and improving the overall safety of the package. The battery cell assembly 3 is located inside the housing frame 5 and is bonded to the bearing surface 408 of the pressure relief heat exchange integration component 4 with structural adhesive.

[0052] Furthermore, the sampling connection assembly 2 is located above the cell group 3. The sampling connection assembly 2 integrates signal sampling and electrical connection functions, and the aluminum busbar connected to it is welded to the pole of each cell body 301 by low internal resistance laser welding.

[0053] Finally, the top cover 1 of the box is connected to the box frame 5 by bolts. Specifically, the aluminum profiles of the four perimeter beams of the box frame 5 are pre-opened, and then the box frame 5 is connected by rivet nuts. The sealing gasket is made to avoid the position of the rivet nut. When the top cover 1 of the box is connected to the box frame 5 by bolts and rivet nuts, the sealing gasket and the support pad 101 on the top cover 1 of the box will be pressed together at the same time. The former completes the seal between the top cover 1 of the box and the box frame 5, and the latter completes the compression assembly, thereby improving the load-bearing capacity and overall packing mode of the top cover 1 of the box.

[0054] This lightweight battery pack, through the coordination of the top cover, sampling connection assembly, cell pack, pressure relief heat exchange integration component, housing frame, and bottom guard plate, reduces the weight of the battery pack by adjusting the structure and increasing integration. This ultimately achieves overall vehicle weight reduction, lower energy consumption, increased driving range, reduced range anxiety, and improved user experience. By integrating the exhaust and heat exchange channels into the pressure relief heat exchange integration component, the battery pack solves the bottom exhaust problem and improves internal integration, saving the exhaust space previously located above the cells. It also ensures heat exchange quality, allowing the top cover to rest directly on the sampling connection assembly, further enhancing integration. By adjusting the structure and materials of the top cover and housing frame, the battery pack's modal characteristics are improved, its protective strength is maintained, and its weight is further reduced, achieving the goal of lightweight battery pack design.

[0055] Furthermore, according to a second aspect of the present invention, a vehicle is provided that includes the lightweight battery pack described above. This vehicle can effectively improve its driving range during use.

[0056] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A lightweight battery pack, comprising a sampling connection assembly, a cell assembly, and a bottom protection plate, wherein the cell assembly is composed of multiple cell bodies arranged in a row, and a pressure relief valve for each cell body is disposed at the bottom of the cell body, characterized in that, The lightweight battery pack also includes a top cover, a pressure relief heat exchange assembly, and a housing frame. The top cover, the sampling connection assembly, the battery cell group, the pressure relief heat exchange assembly, the housing frame, and the bottom protective plate are arranged sequentially in the vertical direction. The pressure relief heat exchange assembly has an internal exhaust channel and a heat exchange channel. The top of the exhaust channel has an exhaust hole, which corresponds to the pressure relief valve of the battery cell body. The heat exchange channel and the exhaust channel are arranged alternately.

2. The lightweight battery pack according to claim 1, characterized in that, The width of the cross-section of the exhaust channel gradually increases along the exhaust direction.

3. The lightweight battery pack according to claim 2, characterized in that, A barrier membrane is provided between the vent and the pressure relief valve.

4. The lightweight battery pack according to claim 1, characterized in that, The box frame includes a side frame and a connecting beam. The connecting beam is snapped into the inside of the side frame, and the outer side wall of the side frame is provided with a vehicle body connection hole.

5. The lightweight battery pack according to claim 4, characterized in that, The frame is formed by extruding and welding aluminum profiles.

6. The lightweight battery pack according to claim 4, characterized in that, The connecting beam is made of non-metallic material, and structural adhesive is applied at the connection between the connecting beam and the frame.

7. The lightweight battery pack according to claim 1, characterized in that, The pressure relief heat exchange assembly is provided with an inlet, an outlet, and an exhaust port on its top. The heat exchange channel is connected to the inlet and the outlet, and the exhaust channel is connected to the exhaust port.

8. The lightweight battery pack according to claim 4, characterized in that, The pressure relief heat exchange assembly has rivet positions for docking with the connecting beam.

9. The lightweight battery pack according to claim 1, characterized in that, The top cover of the box is made of non-metallic material, and a support pad is provided on the side of the top cover facing the sampling connection assembly.

10. A vehicle, characterized in that, The vehicle includes the lightweight battery pack according to any one of claims 1 to 9.

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