Battery pack assembly of new energy automobile and new energy automobile

Abstract

The utility model discloses a new energy automobile battery pack assembly and a new energy automobile, the battery pack assembly comprises a battery pack lower box body, a battery pack box cover and a battery cell, the battery cell is arranged in the battery pack lower box body, and the battery pack assembly also comprises a support cooling assembly and a liquid cooling pipe assembly. The supporting and cooling assembly is arranged between a battery pack lower box body and a battery pack box cover and comprises a bottom protection plate, a vertical liquid cooling plate and a top liquid cooling plate which are integrated, and the bottom protection plate and the top liquid cooling plate are fixed to the two sides of the vertical liquid cooling plate respectively in the thickness direction of the battery pack. A mounting cavity is formed among the top liquid cooling plate, the vertical liquid cooling plate and the bottom protection plate, and the battery cell is positioned in the mounting cavity. The liquid cooling pipe assembly is located on one side of the supporting cooling assembly and comprises a water inlet pipe and a water return pipe, and the water inlet pipe and the water return pipe are in fluid communication with the vertical liquid cooling plate and the top liquid cooling plate correspondingly. The battery pack assembly has the advantages of being low in cost, high in strength and supporting performance and high in heat management efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle batteries, and in particular to a battery pack assembly of a new energy vehicle and a new energy vehicle. Background Art

[0002] As one of the core components of new energy vehicles, the battery pack determines important aspects such as the vehicle's range, cost, lifespan, and safety. Generally speaking, the battery pack system needs to comprehensively consider collision safety, thermal management, structural strength, lightweight design, and other aspects during the design and development process. With the increasing development of new energy vehicle technology, automakers and battery pack suppliers are no longer purely pursuing the safety of the battery pack itself, but are more based on safety, with cost and weight optimization as the main development line for battery pack design and development, in order to achieve the current urgent pursuit of cost reduction and efficiency improvement, thereby improving their own product strength. Based on this, how to maximize the reduction in the number of battery pack components, reduce the weight and cost of the battery pack, and at the same time ensure the mechanical safety, electrical safety, and thermal management performance of the battery pack system is gradually being put on the agenda.

[0003] For example, a Chinese patent with publication number CN218632328U discloses a battery pack and a vehicle, which protect the safety of the battery by improving the accommodation space inside the battery pack, but does not improve the heat dissipation management inside the battery pack and the structural strength of the battery pack. Therefore, the prior art has problems of poor heat dissipation management performance inside the battery pack and poor structural strength of the battery pack. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of poor heat dissipation management performance inside the battery pack and poor structural strength of the battery pack in the prior art.

[0005] In order to solve the above technical problems, an embodiment of the utility model discloses a battery pack assembly for a new energy vehicle, including a battery pack lower box, a battery pack cover and a battery cell, the battery cell is arranged in the battery pack lower box, and also includes a supporting cooling assembly and a liquid cooling pipe assembly.

[0006] The support cooling assembly is arranged between the lower box body of the battery pack and the battery pack cover. The support cooling assembly includes an integrated bottom guard plate, a vertical liquid cooling plate and a top liquid cooling plate. The bottom guard plate and the top liquid cooling plate are respectively fixed to the two sides of the vertical liquid cooling plate along the thickness direction of the battery pack. An installation cavity is formed between the top liquid cooling plate, the vertical liquid cooling plate and the bottom guard plate, and the battery cell is located in the installation cavity. The liquid cooling pipe assembly is located on one side of the support cooling assembly. The liquid cooling pipe assembly includes a water inlet pipe and a water return pipe. The water inlet pipe and the water return pipe are respectively connected to the vertical liquid cooling plate and the top liquid cooling plate fluid.

[0007] By adopting the above technical solution, the number of parts is greatly reduced by integrating multiple parts such as the bottom guard plate, vertical liquid cooling plate and top liquid cooling plate into an integrated component, which effectively reduces the cost and weight of the battery pack while improving the overall bending and torsional stiffness of the battery pack; on the other hand, the integrated structure composed of the bottom guard plate, vertical liquid cooling plate and top liquid cooling plate can provide cooling for multiple surfaces of the battery cell, and can achieve at least three-dimensional cooling, which is conducive to maintaining the uniform temperature inside the battery cell and meeting the requirements of thermal management development. Therefore, the battery pack assembly disclosed in this application has the advantages of low cost, high strength and support performance, and high thermal management efficiency.

[0008] An embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, in which a bottom guard plate, a vertical liquid cooling plate and a top liquid cooling plate are integrally formed and are in the shape of an "I" character as a whole; wherein the vertical liquid cooling plate extends along the length direction of the bottom guard plate, and two installation cavities are formed on both sides of the vertical liquid cooling plate, and a battery cell is arranged in each installation cavity; and the battery cell in each installation cavity includes a plurality of battery cell units arranged at intervals.

[0009] By adopting the above technical solution, the "I"-shaped support cooling assembly can provide better support performance and improve the bending and torsional stiffness of the battery pack as a whole. The installation cavities on both sides facilitate the installation of multiple battery cell units.

[0010] An embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, wherein a heat-insulating fixing component is arranged between any two adjacent battery cell units, and the heat-insulating fixing component is respectively perpendicularly and fixedly connected to the vertical liquid cooling plate and the top liquid cooling plate, and the heat-insulating fixing component includes heat-insulating glue and / or a liquid cooling plate.

[0011] By adopting the above technical solution, the heat-insulating fixing component can not only provide support between two adjacent battery cells, but also perform heat insulation, or dissipate heat through a liquid cooling plate, so that the heat dissipation effect of the battery cells inside the battery pack is better.

[0012] The embodiment of the utility model also discloses a battery pack assembly of a new energy vehicle, wherein the water inlet pipe includes a water inlet main pipe and a plurality of water inlet branches connected to the water inlet main pipe, the water inlet main pipe is connected to the water outlet of the liquid cooling system, and the plurality of water inlet branches are respectively connected to the water inlet of the vertical liquid cooling plate and the top liquid cooling plate. The return water pipe includes a return water main pipe and a plurality of return water branches connected to the return water main pipe, the return water main pipe is connected to the return water end of the liquid cooling system, and the plurality of return water branches are respectively connected to the return water end of the vertical liquid cooling plate and the top liquid cooling plate.

[0013] By adopting the above technical solution, the water inlet pipe provides coolant to the vertical liquid cooling plate and the top liquid cooling plate. The coolant circulates in the vertical liquid cooling plate and the top liquid cooling plate and cools down the heat of the battery cells before flowing back to the liquid cooling system through the return pipe. Arranging multiple water inlet branches and multiple water return branches can make the distribution of the coolant more uniform and the cooling effect better.

[0014] The embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, wherein a plurality of cooling channels arranged side by side are arranged inside the vertical liquid cooling plate and the top liquid cooling plate. The cooling channels of the vertical liquid cooling plate extend along the thickness direction of the battery pack, and the cooling channels of the top liquid cooling plate extend along the length direction of the bottom guard plate.

[0015] By adopting the above technical solution, a plurality of cooling channels arranged side by side are provided inside the vertical liquid cooling plate and the top liquid cooling plate, which can evenly distribute the coolant and cool the battery cells.

[0016] The embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, wherein the bottom guard plate includes a plurality of deformation support tubes and a plurality of pressure relief tubes which are sequentially nested and arranged along the width direction of the bottom guard plate. In the cross-sectional view of the bottom guard plate, the plurality of deformation support tubes are evenly and spaced apart and arranged side by side along the width direction of the bottom guard plate, and the pressure relief tube is spaced apart and arranged between two adjacent deformation support tubes.

[0017] By adopting the above technical scheme, the deformation support tube and the pressure relief tube are integrated together in the bottom guard plate disclosed in the present application, which can achieve thermal and electrical separation, that is, thermal runaway of a single battery cell will not cause thermal runaway of other battery cells due to arcing, short circuit, insulation failure and the like.

[0018] The embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, wherein the cross-sectional shape of each deformation support tube is circular, and along the width direction of the bottom guard plate, two adjacent deformation support tubes are distributed in an 8-shaped shape. The cross-sectional shape of each pressure relief tube is triangular, and two pressure relief tubes arranged along the height direction of the bottom guard plate are arranged between two adjacent deformation support tubes, and the two pressure relief tubes are arranged opposite to each other and also distributed in an 8-shaped shape. The outside of each deformation support tube also has a diamond-shaped support portion formed by the outer wall of the pressure relief tube, and a deformation hole is provided between the support portion and the deformation support tube.

[0019] By adopting the above technical solution, the deformation support pipes and the pressure relief pipes are distributed in an 8-shape and staggered, which can effectively solve the bottom force transmission problem, reduce the weight of the bottom guard plate and improve the bearing capacity of the bottom guard plate.

[0020] The embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle. In a cross-sectional view of the battery pack assembly taken along the width direction of the bottom guard plate, battery cells are arranged on both sides of the vertical liquid cooling plate. A positive electrode port, a negative electrode port and an explosion-proof valve are arranged at intervals at the bottom of each battery cell unit. The explosion-proof valve is arranged on one side of the pressure relief pipe and is located between the positive electrode port and the negative electrode port.

[0021] For example, if a battery cell experiences thermal runaway, the explosion-proof valve will open, and the generated high-temperature and high-pressure gas will directly enter the front crossbeam cavity through the explosion-proof valve and the pressure relief pipe, and be discharged out of the battery pack through the explosion-proof valve of the battery pack box. At the same time, the thermal runaway of a single battery cell will not cause thermal runaway of other battery cells due to arcing, short circuit, insulation failure, etc., thereby achieving the purpose of thermal and electrical separation.

[0022] The embodiment of the utility model also discloses a battery pack assembly for a new energy vehicle, wherein a structural adhesive layer is provided between the battery pack cover and the top liquid cooling plate. A pipe interface adapted to the water inlet pipe and the water return pipe is provided at one end of the lower box of the battery pack, and a battery pack box explosion-proof valve is also provided on one side of the pipe interface.

[0023] By adopting the above technical solution and setting a structural adhesive layer, the Z-direction stiffness of the battery pack can be improved, while supporting CTB expansion (integrating the battery power unit and the vehicle body), and also supporting side force transmission, which can improve side collisions.

[0024] The embodiment of the utility model further discloses a new energy vehicle, comprising a vehicle body and a battery pack assembly of any one of the above-mentioned new energy vehicles.

[0025] The beneficial effects of the utility model are:

[0026] The utility model discloses a battery pack assembly for a new energy vehicle. By integrating multiple components such as a bottom guard plate, a vertical liquid cooling plate, and a top liquid cooling plate into an integrated "I"-shaped component, the number of components is greatly reduced, the cost and weight of the battery pack are effectively reduced, and the overall bending and torsional stiffness of the battery pack is improved. On the other hand, the integrated structure composed of the bottom guard plate, the vertical liquid cooling plate, and the top liquid cooling plate can provide cooling for multiple surfaces of the battery cell, and can at least achieve three-dimensional cooling, which is conducive to maintaining the internal temperature uniformity of the battery cell and meeting the requirements of thermal management development. In addition, the deformation support tube and the pressure relief tube are integrated together in the bottom guard plate, which can achieve thermal and electrical separation, that is, if a certain battery cell has thermal runaway, the explosion-proof valve will open, and the high-temperature and high-pressure gas generated will directly enter the front crossbeam cavity through the explosion-proof valve and the pressure relief tube, and be discharged from the battery pack through the explosion-proof valve of the battery pack box. At the same time, the thermal runaway of a single battery cell will not cause thermal runaway of other batteries due to arcing, short circuit, insulation failure, etc., thereby achieving the purpose of thermal and electrical separation. Therefore, the battery pack assembly disclosed in the present application has the advantages of low cost, high strength and supporting performance, high thermal management efficiency, and good thermal management energy absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view of a battery pack assembly provided in an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the structure of a battery pack assembly supporting a cooling assembly composed of a bottom guard plate, a vertical liquid cooling plate, and a top liquid cooling plate provided in an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the structure of the supporting cooling assembly in the battery pack assembly provided by the embodiment of the utility model, which is composed of a bottom guard plate, a vertical liquid cooling plate, a top liquid cooling plate and a heat-insulating fixing member;

[0030] Figure 4 A schematic diagram of the structure of the water inlet pipeline of the battery pack assembly provided in an embodiment of the utility model;

[0031] Figure 5 A schematic diagram of the structure of the water return pipeline of the battery pack assembly provided in an embodiment of the utility model;

[0032] Figure 6 A cross-sectional view of a battery pack assembly provided in an embodiment of the present utility model;

[0033] Figure 7 A schematic diagram of the impact force transmission when the battery pack assembly provided by the embodiment of the utility model is subjected to a side impact;

[0034] Figure 8 A schematic diagram of the support and bearing of the bottom guard plate of the battery pack assembly provided in an embodiment of the utility model.

[0035] Description of reference numerals:

[0036] 100. Battery pack lower box;

[0037] 110. Pipeline interface; 120. Battery pack explosion-proof valve;

[0038] 200, battery pack cover;

[0039] 300, battery cell;

[0040] 400, supporting cooling components;

[0041] 410, bottom guard plate;

[0042] 411, deformation support tube; 412, pressure relief tube; 413, positive electrode port; 414, negative electrode port; 415, explosion-proof valve;

[0043] 420, vertical liquid cooling plate; 430, top liquid cooling plate; 440, installation cavity; 450, heat insulation fixing member; 460, cooling channel;

[0044] 500, liquid cooling pipe assembly;

[0045] 510, water inlet pipe;

[0046] 511, water inlet main pipe; 512, water inlet branch pipe;

[0047] 520, return pipe;

[0048] 521, return water main pipe; 522, return water branch pipe;

[0049] 600. Structural adhesive layer. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] This application discloses a battery pack assembly for a new energy vehicle, see Figure 1 The battery pack assembly includes a battery pack lower box 100, a battery pack box cover 200 and a battery cell 300. The battery cell 300 is arranged in the battery pack lower box 100, and also includes a supporting cooling assembly 400 and a liquid cooling pipe assembly 500.

[0053] The support cooling assembly 400 is disposed between the battery pack lower box 100 and the battery pack box cover 200. Figure 2As shown, the supporting cooling assembly 400 includes an integrated bottom guard plate 410, a vertical liquid cooling plate 420 and a top liquid cooling plate 430. The bottom guard plate 410 and the top liquid cooling plate 430 are respectively fixed to the two sides of the vertical liquid cooling plate 420 along the thickness direction of the battery pack. An installation cavity 440 is formed between the top liquid cooling plate 430, the vertical liquid cooling plate 420 and the bottom guard plate 410, and the battery cell 300 is located in the installation cavity 440. The liquid cooling pipe assembly 500 is located at one side of the supporting cooling assembly 400. The liquid cooling pipe assembly 500 includes a water inlet pipe 510 and a water return pipe 520. The water inlet pipe 510 and the water return pipe 520 are respectively in fluid communication with the vertical liquid cooling plate 420 and the top liquid cooling plate 430.

[0054] Specifically, in this embodiment, the integrated bottom guard plate 410, vertical liquid cooling plate 420 and top liquid cooling plate 430 may be in the shape of an “I”, and the vertical liquid cooling plate 420 and top liquid cooling plate 430 may provide cooling of two surfaces for the battery cell 300. The bottom guard plate 410 supports the battery cell 300, while the vertical liquid cooling plate 420 and top liquid cooling plate 430 may cool the sides of the battery cell 300 and take away the heat of the battery cell 300. At least three-dimensional cooling may be achieved, which is conducive to maintaining the internal temperature uniformity of the battery cell 300 and meeting the requirements of thermal management development.

[0055] More specifically, the bottom guard plate 410, the vertical liquid cooling plate 420 and the top liquid cooling plate 430 are an integrated structure, which integrates multiple components into an integrated component, greatly reducing the number of components, effectively reducing the cost and weight of the battery pack while improving the overall bending and torsional stiffness of the battery pack. Therefore, the battery pack assembly disclosed in the present application has the advantages of low cost, high strength and support performance, and high thermal management efficiency.

[0056] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 2 , the bottom guard plate 410, the vertical liquid cooling plate 420 and the top liquid cooling plate 430 are integrally formed and are in the shape of an "I" as a whole; wherein the vertical liquid cooling plate 420 extends along the length direction of the bottom guard plate 410, and two installation cavities 440 are formed on both sides of the vertical liquid cooling plate 420, and each installation cavity 440 is provided with a battery cell 300. And the battery cell 300 in each installation cavity 440 includes a plurality of battery cell units arranged at intervals. With this design, the support cooling assembly 400 of the "I"-shaped structure can provide better support performance, and improve the bending and torsional stiffness of the battery pack as a whole, the installation cavities 440 on both sides are convenient for installing multiple battery cell units, and the support cooling assembly 400 can be integrally formed by welding, casting, bonding, etc.

[0057] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, which can be seen in Figure 3A heat-insulating fixing component 450 is also provided between any two adjacent battery cell units. The heat-insulating fixing component 450 is vertically and fixedly connected to the vertical liquid cooling plate 420 and the top liquid cooling plate 430 respectively. The heat-insulating fixing component 450 includes heat-insulating glue and / or a liquid cooling plate.

[0058] In one preferred embodiment, see Figure 3 , a plurality of heat-insulating fixing members 450 are arranged in the installation cavity 440 of the "I"-shaped support cooling assembly 400, that is, there is a heat-insulating fixing member 450 between any two adjacent battery cells. When the heat-insulating fixing member 450 adopts a liquid cooling plate, only one side of each battery cell unit close to the bottom guard plate 410 is a supporting part, and at least four surfaces of the remaining sides are directly cooled by the liquid cooling plate, thereby making the cooling effect of each battery cell unit optimal. In other words, through this setting method, N-dimensional cooling can be achieved, where N≥3. When the heat-insulating fixing member 450 is set as a heat-insulating glue, it can also isolate the heat between two adjacent battery cells, thereby making the safety performance of the battery cell 300 higher. And by adopting the above technical solution, the heat-insulating fixing member 450 can not only provide support between two adjacent battery cells 300, but also perform heat insulation, or dissipate heat through the liquid cooling plate, so that the heat dissipation effect of the battery cell 300 inside the battery pack is better, or it can also be set in a way that the heat-insulating glue and the liquid cooling plate are alternately distributed.

[0059] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 4 and Figure 5 The water inlet pipe 510 includes a water inlet main pipe 511 and a plurality of water inlet branches 512 connected to the water inlet main pipe 511. The water inlet main pipe 511 is connected to the water outlet of the liquid cooling system, and the plurality of water inlet branches 512 are respectively connected to the water inlet of the vertical liquid cooling plate 420 and the top liquid cooling plate 430. The water return pipe 520 includes a water return main pipe 521 and a plurality of water return branches 522 connected to the water return main pipe 521. The water return main pipe 521 is connected to the water return end of the liquid cooling system, and the plurality of water return branches 522 are respectively connected to the water return ends of the vertical liquid cooling plate 420 and the top liquid cooling plate 430.

[0060] Specifically, the water inlet pipe 510 provides cooling liquid to the vertical liquid cooling plate 420 and the top liquid cooling plate 430. The cooling liquid circulates in the vertical liquid cooling plate 420 and the top liquid cooling plate 430, cools and takes away the heat of the battery cell 300, and then flows back to the liquid cooling system through the return pipe 520. The provision of multiple water inlet branches 512 and multiple return branches 522 can make the distribution of the cooling liquid more uniform and the cooling effect better. In addition, the number and setting positions of the water inlet pipe 510 and the return pipe 520 can be flexibly selected according to design requirements, which is also conducive to improving the bending stiffness and torsional stiffness of the battery pack.

[0061] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 6 , a plurality of cooling channels 460 arranged side by side are arranged inside the vertical liquid cooling plate 420 and the top liquid cooling plate 430. The cooling channels 460 of the vertical liquid cooling plate 420 extend along the thickness direction of the battery pack, and the cooling channels 460 of the top liquid cooling plate 430 extend along the length direction of the bottom guard plate 410. A plurality of cooling channels 460 arranged side by side are arranged inside the vertical liquid cooling plate 420 and the top liquid cooling plate 430, which can evenly distribute the coolant and cool the battery cell 300. The coolant in the cooling pipeline circulates in the cooling channel 460 to cool and take away the heat of the battery cell 300.

[0062] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 6 The bottom guard plate 410 includes a plurality of deformation support tubes 411 and a plurality of pressure relief tubes 412 which are sequentially nested along the width direction of the bottom guard plate 410. In the cross-sectional view of the bottom guard plate 410, the plurality of deformation support tubes 411 are evenly and spacedly arranged side by side along the width direction of the bottom guard plate 410, and the pressure relief tube 412 is spacedly arranged between two adjacent deformation support tubes 411.

[0063] By adopting the above technical solution, the deformation support tube 411 and the pressure relief tube 412 are integrated together in the bottom guard plate 410 disclosed in the present application, so as to realize thermal and electrical separation, that is, thermal runaway of a single battery cell 300 will not cause thermal runaway of other battery cells 300 due to arcing, short circuit, insulation failure and the like.

[0064] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 6 and Figure 7 The cross-sectional shape of each deformation support tube 411 is circular, and along the width direction of the bottom guard plate 410, two adjacent deformation support tubes 411 are distributed in an 8-shaped shape. The cross-sectional shape of each pressure relief tube 412 is triangular, and two pressure relief tubes 412 arranged along the height direction of the bottom guard plate 410 are arranged between two adjacent deformation support tubes 411. The two pressure relief tubes 412 are arranged opposite to each other and are also distributed in an 8-shaped shape. The outside of each deformation support tube 411 also has a diamond-shaped support portion formed by the outer wall of the pressure relief tube 412, and a deformation hole is provided between the support portion and the deformation support tube 411.

[0065] By adopting the above technical solution, the deformation support tube 411 and the pressure relief tube 412 are distributed in an 8-shape and staggered, which can effectively solve the bottom force transmission problem and disperse and absorb the impact force along the "8"-shaped edge when impacted, thereby reducing the weight of the bottom guard plate 410 and improving the bearing capacity of the bottom guard plate 410, thereby meeting the impact protection requirements of the bottom of the battery pack.

[0066] The implementation method of this embodiment also discloses a battery pack assembly for a new energy vehicle, see Figure 6 In the cross-sectional view of the battery pack assembly taken along the width direction of the bottom guard plate 410, battery cells are arranged on both sides of the vertical liquid cooling plate 420. The bottom of each battery cell is provided with a positive electrode port 413, a negative electrode port 414 and an explosion-proof valve 415 at intervals. The explosion-proof valve 415 is arranged on one side of the pressure relief pipe 412 and between the positive electrode port 413 and the negative electrode port 414.

[0067] For example, if a battery cell 300 experiences thermal runaway, the explosion-proof valve 415 will open, and the generated high-temperature and high-pressure gas will directly enter the front crossbeam cavity through the explosion-proof valve 415 and the pressure relief pipe 412, and be discharged out of the battery pack through the battery pack box explosion-proof valve 120. At the same time, the thermal runaway of a single battery cell 300 will not cause thermal runaway of other battery cells 300 due to arcing, short circuit, insulation failure, etc., thereby achieving the purpose of thermal and electrical separation.

[0068] The implementation of this embodiment also discloses a battery pack assembly for a new energy vehicle, wherein a structural adhesive layer 600 is provided between the battery pack cover 200 and the top liquid cooling plate 430. A pipe interface 110 adapted to the water inlet pipe 510 and the water return pipe 520 is provided at one end of the battery pack lower box 100, and a battery pack box explosion-proof valve 120 is also provided on one side of the pipe interface 110. And see Figure 1 and Figure 7 The support cooling assembly 400 may be symmetrically arranged in two groups in the battery pack.

[0069] By adopting the above technical solution and setting the structural adhesive layer 600, the Z-direction rigidity of the battery pack can be improved, while supporting CTB expansion (integration of the battery power unit and the vehicle body), and supporting side force transmission, which can improve side collision. The battery pack cover 200 and the top liquid cooling plate 430 are bonded as a whole by the structural adhesive layer 600, which can support side force transmission and help improve side collision.

[0070] In summary, the utility model discloses a battery pack assembly for a new energy vehicle. By integrating multiple components such as a bottom guard plate 410, a vertical liquid cooling plate 420, and a top liquid cooling plate 430 into an integrated "I"-shaped component, the number of components is greatly reduced, the cost and weight of the battery pack are effectively reduced, and the overall bending and torsional stiffness of the battery pack is improved. On the other hand, the integrated structure composed of the bottom guard plate 410, the vertical liquid cooling plate 420, and the top liquid cooling plate 430 can provide cooling for multiple surfaces of the battery cell 300, and can achieve at least three-dimensional cooling, which is conducive to maintaining the internal temperature uniformity of the battery cell 300 and meeting the requirements of thermal management development. In addition, the deformation support tube 411 and the pressure relief tube 412 are integrated in the bottom guard plate 410, which can realize thermal and electrical separation, that is, if a battery cell 300 has thermal runaway, the explosion-proof valve 415 will open, and the generated high-temperature and high-pressure gas will directly enter the front crossbeam cavity through the explosion-proof valve 415 and the pressure relief tube 412, and be discharged from the battery pack through the battery pack box explosion-proof valve 120. At the same time, the thermal runaway of a single battery cell 300 will not cause thermal runaway of other battery cells 300 due to arcing, short circuit, insulation failure, etc., thereby achieving the purpose of thermal and electrical separation. Therefore, the battery pack assembly disclosed in the present application has the advantages of low cost, high strength and support performance, high thermal management efficiency, and good thermal management energy absorption.

[0071] Further, see Figure 1 The overall structure of the battery pack assembly is briefly described. The battery pack assembly includes, from bottom to top, the battery pack lower box 100, the bottom guard plate 410, the battery cell 300, the vertical liquid cooling plate 420, the top liquid cooling plate 430, the structural adhesive layer 600 and the battery pack cover 200. The battery pack lower box 100 and the battery pack cover 200 are the outermost frames of the battery pack. The support cooling assembly 400, the battery cell 300, the cooling pipeline, etc. are all located in the space of the battery pack lower box 100 and the battery pack cover 200. The cooling pipeline includes an inlet pipe 510 and a return pipe 520. The coolant flows to the vertical liquid cooling plate 420 and the top liquid cooling plate 430 through the inlet pipe 510, and flows back to the liquid cooling system through the return pipe 520 to achieve circulating cooling after circulating in the cooling channel 460 in the vertical liquid cooling plate 420 and the top liquid cooling plate 430.

[0072] For further information, see Figure 7 When the battery pack is hit or impacted from the side, the impact force is transmitted through the structure of the battery pack lower box 100, the battery pack box cover 200 and the bottom guard plate 410. Figure 7 When the left side of the battery pack receives an impact, the impact force is absorbed and transmitted in the direction of the arrow, thereby ensuring the safety of the internal battery cell 300. Figure 8 The bottom guard plate 410 provides good support for the battery pack. Figure 8As shown by the triangle and arrow below the midsole guard plate 410, this structural design can ensure the mechanical safety of the battery pack.

[0073] Example 2

[0074] The implementation of this embodiment also discloses a new energy vehicle, including a vehicle body, and also includes a battery pack assembly of any one of the new energy vehicles in Embodiment 1. The new energy vehicles disclosed in this utility model include but are not limited to common electric vehicles, plug-in hybrid vehicles, oil-electric hybrid vehicles, etc., and refer to Figure 1 and Figure 7 The support cooling assembly 400 in the battery pack assembly can be two groups symmetrically arranged in the battery pack.

[0075] It should be noted that, in addition to the implementation methods of the utility model described in the above-mentioned specific specific embodiments, those skilled in the art can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. Although the description of the utility model will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation method. On the contrary, the purpose of introducing the utility model in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the utility model. In order to provide an in-depth understanding of the utility model, the above description contains many specific details, and the utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0076] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0077] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0078] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0079] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0080] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack assembly for a new energy vehicle, comprising a battery pack lower box, a battery pack cover and a battery cell, wherein the battery cell is arranged in the battery pack lower box, characterized in that: Also includes: A support cooling assembly, the support cooling assembly is arranged between the lower box body of the battery pack and the box cover of the battery pack, the support cooling assembly includes an integrated bottom guard plate, a vertical liquid cooling plate and a top liquid cooling plate, the bottom guard plate and the top liquid cooling plate are respectively fixed to two sides of the vertical liquid cooling plate along the thickness direction of the battery pack, an installation cavity is formed between the top liquid cooling plate, the vertical liquid cooling plate and the bottom guard plate, and the battery cell is located in the installation cavity; A liquid cooling pipe assembly is located on one side of the supporting cooling assembly, and includes a water inlet pipe and a water return pipe, wherein the water inlet pipe and the water return pipe are respectively connected to the vertical liquid cooling plate and the top liquid cooling plate fluid.

2. The battery pack assembly for a new energy vehicle as claimed in claim 1, characterized in that: The bottom guard plate, the vertical liquid cooling plate and the top liquid cooling plate are integrally formed and are in an "I" shape as a whole; wherein the vertical liquid cooling plate extends along the length direction of the bottom guard plate, and two installation cavities are formed on both sides of the vertical liquid cooling plate, and the battery cell is arranged in each installation cavity; and The battery cell in each installation cavity includes a plurality of battery cell units arranged at intervals.

3. The battery pack assembly for a new energy vehicle as claimed in claim 2, characterized in that: A heat-insulating fixing member is also provided between any two adjacent battery core units, and the heat-insulating fixing member is respectively perpendicular to and fixedly connected to the vertical liquid cooling plate and the top liquid cooling plate; and The heat-insulating fixing component includes heat-insulating glue and / or a liquid cooling plate.

4. The battery pack assembly for a new energy vehicle as claimed in claim 1, characterized in that: The water inlet pipe includes a water inlet main pipe and a plurality of water inlet branches connected to the water inlet main pipe, the water inlet main pipe is connected to the water outlet of the liquid cooling system, and the plurality of water inlet branches are respectively connected to the water inlet ends of the vertical liquid cooling plate and the top liquid cooling plate; The return water pipe includes a return water main pipe and a plurality of return water branches connected to the return water main pipe. The return water main pipe is connected to the return water end of the liquid cooling system. The plurality of return water branches are respectively connected to the return water ends of the vertical liquid cooling plate and the top liquid cooling plate.

5. The battery pack assembly for a new energy vehicle as claimed in claim 4, characterized in that: The vertical liquid cooling plate and the top liquid cooling plate are both provided with a plurality of cooling channels arranged side by side; The cooling channel of the vertical liquid cooling plate extends along the thickness direction of the battery pack, and the cooling channel of the top liquid cooling plate extends along the length direction of the bottom guard plate.

6. The battery pack assembly for a new energy vehicle according to any one of claims 1 to 5, characterized in that: The bottom guard plate comprises a plurality of deformation support tubes and a plurality of pressure relief tubes which are sequentially nested and arranged along the width direction of the bottom guard plate; in In the cross-sectional view of the bottom guard plate, a plurality of the deformation support tubes are evenly and spaced apart and arranged side by side along the width direction of the bottom guard plate, and the pressure relief tube is spaced apart and arranged between two adjacent deformation support tubes.

7. The battery pack assembly for a new energy vehicle as claimed in claim 6, characterized in that: The cross-section of each of the deformable support tubes is circular, and along the width direction of the bottom guard plate, two adjacent deformable support tubes are distributed in an 8-shape; The cross-section of each of the pressure relief pipes is triangular, and two of the pressure relief pipes arranged along the height direction of the bottom guard plate are arranged between two adjacent deformation support pipes. The two pressure relief pipes are arranged opposite to each other and are also distributed in an 8-shape; and The outside of each of the deformable support tubes is also provided with a diamond-shaped support portion surrounded by the outer wall of the pressure relief tube, and a deformation hole is provided between the support portion and the deformable support tube.

8. The battery pack assembly for a new energy vehicle as claimed in claim 7, characterized in that: In a cross-sectional view of the battery pack assembly taken along the width direction of the bottom guard plate, battery cell units are provided on both sides of the vertical liquid cooling plate; and The bottom of each of the battery cells is provided with a positive electrode port, a negative electrode port and an explosion-proof valve at intervals. The explosion-proof valve is provided on one side of the pressure relief pipe and is located between the positive electrode port and the negative electrode port.

9. The battery pack assembly for a new energy vehicle as claimed in claim 1, characterized in that: A structural adhesive layer is provided between the battery pack cover and the top liquid cooling plate; and One end of one side of the lower box of the battery pack is provided with a pipeline interface respectively adapted to the water inlet pipe and the water return pipe, and a battery pack box explosion-proof valve is also provided on one side of the pipeline interface.

10. A new energy vehicle, characterized in that: It comprises a vehicle body and also comprises a battery pack assembly for a new energy vehicle as claimed in any one of claims 1 to 9.

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