Battery module and vehicle

Abstract

The embodiment of the present application discloses a battery module and a vehicle, which relates to the field of vehicle engineering. A heat dissipation component is arranged at the pole, and the heat dissipation component and the pole exchange heat, directly cooling or heating the pole of the battery, improving the thermal management efficiency, and being applicable to the universal and modular design of the battery module, and applicable to battery packs of different series-parallel structures, and the arrangement is simple, flexible and reliable. The battery module includes a battery and a heat dissipation component, wherein the battery includes a pole; the heat dissipation component is arranged on the pole, and is used to dissipate heat from the battery. The battery module is used to provide electrical energy.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of vehicle engineering, and in particular to a battery module and a vehicle. Background Art

[0002] Currently, most electric vehicles are equipped with lithium-ion power batteries, which are very sensitive to temperature. Based on the characteristics of ternary materials, the temperature directly affects the basic performance and service life. Too high temperature will accelerate the attenuation rate of lithium batteries, while too low temperature will significantly reduce the charging and discharging performance. Therefore, it is particularly important to achieve reliable and efficient thermal management of lithium batteries.

[0003] Most of the battery liquid cooling plates in the prior art are arranged separately inside the battery pack or integrated with the lower base plate. The battery is heated or cooled by exchanging heat between the thermal pad and the heat dissipation surface of the battery module. The battery is generally arranged vertically inside the battery module. The heating part is near the single pole, and due to the internal structure of the battery single, the thermal conductivity in the vertical direction is poor. Therefore, the cooling or heating efficiency of the battery single at the bottom of the module is low, and the upper cover of the battery module generally adopts a plastic cover without additional protection. When the battery single thermal runaway occurs, such a structure will quickly spread to other single cells, modules and even the entire battery pack, and the high-temperature and high-pressure gas or flame ejected from the battery cell explosion-proof valve will break through the upper cover of the battery pack and then spread to the entire vehicle, leaving a relatively short safety time for the passengers. Summary of the invention

[0004] The embodiment of the present application provides a battery module and a vehicle, in which a heat dissipation component is arranged at the pole, and the heat dissipation component exchanges heat with the pole to directly cool or heat the pole part of the battery, thereby improving the thermal management efficiency. It is also suitable for the universal and modular design of the battery module and is suitable for battery packs with different series-parallel structures. The layout is simple, flexible and reliable.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, the present application provides a battery module, including a battery and a heat dissipation assembly, wherein the battery includes a pole; the heat dissipation assembly is arranged on the pole to dissipate heat from the battery.

[0007] The battery module provided in the embodiment of the present application has a heat dissipation component arranged on the pole column, because most of the heat generating parts of the battery are located near the pole lug and the pole column, and the pole column and the pole lug are located on the same side. Therefore, the heat dissipation component is arranged on the pole column, which is used to directly transfer the heat on the pole lug and the pole column to the heat dissipation component, thereby reducing the heat transfer distance and shortening the heat transfer time. Compared with the related art in which the heat dissipation component is placed at the bottom of the battery, the thermal conductivity in the vertical direction of the battery is poor, resulting in low efficiency of the heat dissipation component in cooling or heating the bottom of the battery, the present application directly arranges the heat dissipation component at the pole lug and the pole column, which are the main heat generating parts of the battery, so that the heat on the pole lug and the pole can be directly transferred to the heat dissipation component, and then transferred to the outside through the heat dissipation component. When the battery needs to be heated, the heat dissipation unit located at the pole lug and the pole column is equivalent to a heat insulation layer, which blocks the heat exchange between the battery and the outside world, thereby improving the thermal management efficiency. That is, the battery module provided in the present application sets the heat dissipation component at the pole, and the heat dissipation component exchanges heat with the pole, directly cooling or heating the pole part of the battery, thereby improving the thermal management efficiency. It is also suitable for the universal and modular design of the battery module, and is suitable for battery packs with different series-parallel structures. The layout is simple, flexible and reliable.

[0008] In a possible implementation of the present application, the heat dissipation assembly includes a liquid cooling plate, the liquid cooling plate is filled with a coolant, and the liquid cooling plate is arranged on the pole.

[0009] The battery module provided in the embodiment of the present application has a liquid cooling plate with high heat dissipation power, which can promptly discharge the excess heat generated during battery operation to avoid excessive temperature rise. The sealing reliability of the liquid cooling plate is high, and the liquid cooling plate is filled with a coolant with high heat exchange efficiency, which can quickly cool or heat the battery pole or lug area.

[0010] In a possible implementation of the present application, a water inlet and a water outlet are provided on the liquid cooling plate, and the water inlet and the water outlet are used to connect a hose.

[0011] The battery module provided in the embodiment of the present application is often used in parallel or in series with multiple battery modules during the use of the battery module. The coolant needs to flow through the liquid cooling plate according to the series pipelines or parallel pipelines between the liquid cooling plates. Therefore, a water inlet and a water outlet are provided on the liquid cooling plate. The water inlet and the water outlet are used to connect the hose. Such a configuration reduces the temperature difference between the liquid cooling plates, resulting in a corresponding reduction in the temperature difference between the battery modules.

[0012] In a possible implementation of the present application, the water inlet and the water outlet are arranged on a side of the liquid cooling plate close to the pole.

[0013] The battery module provided in the embodiment of the present application has a water inlet and a water outlet for connecting a hose. The hose is arranged in series or in parallel according to the relationship between the liquid cooling plates, which requires a certain amount of space. In order to improve the space utilization of the battery module, the water inlet and the water outlet are arranged on the side of the liquid cooling plate close to the pole, so that the water pipe is arranged on the lower side of the liquid cooling plate and does not occupy the overall space height of the battery module.

[0014] In a possible implementation of the present application, a pressure relief area is provided on one side of the battery where the pole is provided, and a fire extinguishing port is provided on the liquid cooling plate, and the positions of the fire extinguishing port and the pressure relief area correspond one to one.

[0015] The battery module provided in the embodiment of the present application has the fire extinguishing port and the pressure relief area positioned correspondingly. When the liquid cooling system works normally, the internal pressure is insufficient to break through the fire extinguishing port, thereby ensuring the normal flow of the coolant. When the battery has thermal runaway, the pressure relief area opens and sprays out high-temperature and high-pressure gas, which can break through the fire extinguishing port, so that the flame-retardant coolant is sprayed through the fire extinguishing port onto the battery having thermal runaway, thereby achieving a certain flame-retardant and cooling effect.

[0016] In a possible implementation of the present application, a box body is included, a receiving cavity is provided in the box body, and the box body is open, folded edges are provided on both sides of the liquid cooling plate, and a buckling part is provided on the box body. The folded edge cooperates with the buckling part to fix the liquid cooling plate on the box body.

[0017] The battery module provided in the embodiment of the present application places the battery in the accommodating cavity of the box, which is conducive to the regular placement of the battery, and folded edges are provided on both sides of the liquid cooling plate. The box is provided with a buckling portion. The folded edges cooperate with the buckling portion to fix the liquid cooling plate on the box. The liquid cooling plate is connected to the box by a buckle, which facilitates the disassembly and replacement of the battery or the liquid cooling plate, thereby improving management efficiency.

[0018] In a possible implementation of the present application, the liquid cooling plate is made of metal material.

[0019] The battery module provided in the embodiment of the present application, when a battery thermal runaway occurs, it will quickly spread to other batteries and parts of the module, and the gas or flame ejected by the high-temperature air pressure will break through the liquid cooling plate. Therefore, the liquid cooling plate is made of metal material, which can withstand the impact for a certain period of time and facilitate the escape of passengers.

[0020] In a possible implementation of the present application, the heat dissipation unit includes a thermal pad made of an insulating material, and the thermal pad is disposed between the pole and the liquid cooling plate to transfer heat from the pole to the liquid cooling plate.

[0021] In the battery module provided in the embodiment of the present application, the liquid cooling plate and the pole are both rigid parts, which are not easy to install and fix. Therefore, a thermal pad is arranged between the pole and the liquid cooling plate. Since the application environment of the thermal pad is relatively special, a thermal pad made of insulating material is selected.

[0022] In a possible implementation of the present application, a heat insulation board is included, and the heat insulation board is arranged on a side of the heat dissipation unit away from the pole.

[0023] The battery module provided in the embodiment of the present application has a heat insulation plate arranged on the side of the heat dissipation unit away from the pole, which can effectively isolate the heat dissipation unit from the contact with the outside air, so that the heat exchange of the heat dissipation unit is carried out through one side of the battery, thereby improving the overall heat exchange efficiency, reducing heat loss, and improving the thermal insulation effect of the battery module.

[0024] In a second aspect, the present application provides a vehicle, comprising a power system and the battery module provided in the first aspect, wherein the battery module is electrically connected to the power system for providing electrical energy to the power system.

[0025] The vehicle provided in the embodiment of the present application, since it includes the battery module provided in the first aspect, has the same technical effect, that is, the heat dissipation component is arranged at the pole, the heat dissipation component exchanges heat with the pole, and the pole part of the battery is directly cooled or heated, thereby improving the thermal management efficiency, and is suitable for the universal and modular design of the battery module, and is suitable for battery packs with different series-parallel structures, and the layout is simple, flexible and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An overall schematic diagram of a battery module provided in an embodiment of the present application;

[0027] Figure 2 An exploded view of a battery module provided in an embodiment of the present application;

[0028] Figure 3 One of the schematic diagrams of the positions of the liquid cooling plate and the battery in the battery module provided in the embodiment of the present application;

[0029] Figure 4 The second schematic diagram of the position of the battery module liquid cooling plate and the battery provided in the embodiment of the present application.

[0030] Reference numerals

[0031] 1-battery; 11-pole; 12-pressure relief area; 2-heat dissipation assembly; 21-liquid cooling plate; 211-water inlet; 212-water outlet; 213-fire extinguishing port; 214-folding edge; 22-mica board; 3-box; 31-fastening part; 4-heat insulation board; 5-bus; 6-flexible circuit board. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0034] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0035] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0036] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0037] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0038] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0039] Vehicles are divided into passenger cars and commercial vehicles. Passenger cars are mainly used to carry passengers, their carry-on luggage and temporary items in terms of their design and technical characteristics. Including the driver's seat, a passenger car has no more than 9 seats. Passenger cars are divided into the following 11 types of models, mainly including: ordinary passenger cars, convertible passenger cars, high-end passenger cars, small passenger cars, convertibles, hatchback passenger cars, station wagons, multi-purpose passenger cars, short-head passenger cars, off-road passenger cars, and special passenger cars. Commercial vehicles are used to transport people and goods in terms of design and technical characteristics, and can tow trailers, but passenger cars are not included. They mainly include: buses, semi-trailer tractors, and trucks.

[0040] This application takes electric vehicles as an example. Electric vehicles are divided into fuel cell vehicles (FCEV), hybrid electric vehicles (HEV) and pure electric vehicles (BEV) according to the type of fuel. Fuel cell vehicles use fuel cells as power sources. The chemical reaction process of fuel cells does not produce harmful substances. Therefore, fuel cell vehicles are pollution-free vehicles. The energy conversion efficiency of fuel cells is 2 to 3 times higher than that of internal combustion engines. Therefore, from the perspective of energy utilization and environmental protection, fuel cell vehicles are an ideal vehicle; hybrid electric vehicles are devices that use consumable fuel or rechargeable energy or energy storage. After using hybrid power, the maximum power of the internal combustion engine can be determined according to the average required power. Pure electric vehicles are vehicles driven by electric motors.

[0041] At present, most electric vehicles are equipped with lithium-ion power batteries. Lithium-ion batteries are three times that of nickel-chromium batteries and nickel-metal hydride batteries, and twice that of lead-acid batteries. They have the advantages of high voltage, light weight, long life and wide range, and are pollution-free to use. However, lithium batteries are very sensitive to temperature, and due to the characteristics of ternary materials, ternary materials are materials composed of three chemical components (elements), components (single substances and compounds) or parts (parts), including alloys, inorganic metal materials, organic materials, polymer composite materials, etc., their temperature will directly affect the basic performance and service life of the battery. Too high temperature will accelerate the attenuation rate of lithium batteries, and too low temperature will significantly reduce the charging and discharging performance. Therefore, it is particularly important to achieve reliable and efficient thermal management of lithium batteries.

[0042] The basic structure of an electric vehicle includes an engine, chassis, body and tires. The engine is a power device, which consists of two major mechanisms and five major systems, namely, a crank-connecting rod mechanism, a valve mechanism, a cooling system, a fuel supply system, a gear train and a starting system. The function of the chassis is to support and install the automobile engine and its various parts. The body is installed on the frame of the chassis and is used for the driver and passengers to ride or load cargo. In other words, the engine can also be called a power system. Electric vehicles need to run and require a power system to work. Therefore, the present application provides a battery module, which is electrically connected to the power system of the electric vehicle to provide electrical energy to the electric vehicle.

[0043] The present application provides a battery module, referring to Figure 1 and Figure 2 , including a battery 1 and a heat dissipation component 2, wherein the battery 1 includes a pole 11; the heat dissipation component 2 is arranged on the pole 11 and is used to dissipate heat for the battery 1.

[0044] Please refer to Figure 1 and Figure 2 In the battery module provided in the embodiment of the present application, since the heating parts of the battery 1 are mostly located near the pole ears and poles 11, the heat dissipation component 2 is arranged on the poles 11 to directly transfer the heat on the pole ears and poles 11 to the heat dissipation component 2, thereby reducing the heat transfer distance and shortening the heat transfer time. Compared with the related art in which the heat dissipation component is placed at the bottom of the battery, the thermal conductivity in the vertical direction of the battery is poor, resulting in low efficiency of the heat dissipation component in cooling or heating the bottom of the battery, the present application directly arranges the heat dissipation component 2 at the pole ears and poles 11, which are the main heating parts of the battery 1, so that the heat on the pole ears and poles 11 can be directly transferred to the heat dissipation component 2, and then transferred to the outside through the heat dissipation component 2. When the battery 1 needs to be heated, the heat dissipation unit located at the pole ears and poles 11 is equivalent to a heat insulation layer, which blocks the heat exchange between the battery 1 and the outside world, thereby improving the thermal management efficiency. That is, the battery module provided in the present application sets the heat dissipation component 2 at the pole 11, and the heat dissipation component 2 exchanges heat with the pole 11, directly cooling or heating the pole 11 of the battery 1, thereby improving the thermal management efficiency, and being suitable for the universal and modular design of the battery module, and being suitable for battery packs with different series-parallel structures, and the arrangement method is simple, flexible and reliable.

[0045] Reference Figure 1 and Figure 2It should be specifically explained that the number of batteries 1 in the battery module provided in the embodiment of the present application can be one single battery 1, and the heat dissipation component 2 is directly arranged on the pole 11 of the single battery 1 to dissipate heat for the single battery 1; or the number of batteries 1 can be multiple, and multiple single batteries 1 are placed in combination, and the heat dissipation unit is placed on one side of the poles 11 of multiple single batteries. When the number of batteries 1 is multiple, similarly, the number of heat dissipation units can be one, and the heat dissipation unit completely covers the poles 11 of multiple batteries, or the number of heat dissipation units can be multiple, and each battery 1 is covered with a heat dissipation unit. This application does not impose any restrictions on this.

[0046] like Figure 1 and Figure 2 As shown, by way of example, the present application provides a battery module, wherein the number of batteries 1 is four and the number of heat dissipation units is one for introduction, the battery module comprises a box body 3, a receiving cavity is arranged in the box body 3, for receiving the battery 1, the shape of the receiving cavity is the same as the shape of the four batteries 1 after being combined, the box body 3 is open, and the four batteries 1 are connected to a bus 5 on one side close to the pole 11. It should be supplemented that the bus 5 is a connection method for incoming lines, which increases the contact area, reduces energy consumption, and reduces temperature rise. It is a traditional wiring method, and the wiring method using the bus 5 is versatile and practical, has the advantages of safety and reliability, and is made of pure copper, has high conductivity, and low contact resistance, and will not increase the design cost of the battery module.

[0047] Next, refer to Figure 1 and Figure 2 A flexible circuit board 6 is disposed on the upper side of the bus 5. The flexible circuit board 6 is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as a substrate. It has the characteristics of high wiring density, light weight, thin thickness and good bendability, which reduces the weight and space of the battery module.

[0048] like Figure 1 and Figure 2 As shown, the box body 3 is open and a receiving cavity is provided inside the box body 3, and the battery 1 can be placed in the receiving cavity. Therefore, the box body 3 can be designed as an integral molding or a split molding. The integral molding design can ensure the firmness of the box body 3, but the production cost is relatively high. The split design can reduce the production cost of the box body 3, but welding is required and the processing time is relatively long. It can be selected according to demand. The present application provides a split design solution, which divides the box body 3 into a box body bottom plate and a box body side plate. After the box body side plate and the box body bottom plate are produced, they are welded to form a receiving cavity for accommodating the battery 1.

[0049] Reference Figure 1 and Figure 2The heat dissipation unit is arranged on one side of the battery pole 11, and is used to cool or heat the battery 1. The heat dissipation unit may be a liquid cooling plate 21, and a coolant is filled in the liquid cooling plate 21, and the liquid cooling plate 21 is arranged on the pole 11. The liquid cooling plate 21 has a large heat dissipation power, and can timely conduct away the excess heat generated by the battery 1 during operation to avoid excessive temperature rise. The sealing reliability of the liquid cooling plate 21 is high, and the liquid cooling plate 21 is filled with a coolant with high heat exchange efficiency, and can quickly cool or heat the pole 11 or the pole ear (the pole and the pole ear are located on the same side) of the battery 1.

[0050] like Figure 1 and Figure 2 As shown, when the heat dissipation unit is a liquid cooling plate 21, the liquid cooling plate 21 is placed on one side of the opening of the box body 3, the accommodating cavity is used to accommodate the battery 1, the liquid cooling plate 21 is arranged on one side of the pole 11 of the battery 1, and the liquid cooling plate 21 needs to be fixed to one side of the opening of the box body 3, and the fixing method can be selected from welding, bolt connection or snap connection, and welding can be selected from ordinary welding or laser welding; for bolt connection, threaded holes can be arranged on the box body 3 and the liquid cooling plate 21, and the bolts cooperate with the threaded holes to fix the box body 3 and the liquid cooling plate 21 together; a snap connection can also be arranged, and folded edges 214 are arranged on both sides of the liquid cooling plate 21, and a snap-fitting portion 31 is arranged on the box body 3, and the folded edges 214 cooperate with the snap-fitting portion 31 to fix the liquid cooling plate 21 on the box body 3, and the liquid cooling plate 21 is snap-fitted to the box body 3, which is convenient for disassembly and replacement of the battery 1 or the liquid cooling plate 21, thereby improving management efficiency. In order to further improve the firmness of the connection between the box body 3 and the liquid cooling plate 21, folded edges 214 are provided on the front and rear sides of the liquid cooling plate 21. While a buckling portion 31 is provided on the box body 3, diamond-shaped protrusions are provided on the left and right sides of the liquid cooling plate 21 along the direction of the pole 11. The liquid cooling plate 21 can be snapped into the position of the box body 3 and the diamond-shaped protrusions. At the same time, the folded edges 214 cooperate with the buckling portion 31 to firmly fix the liquid cooling plate 21 on the box body 3.

[0051] Reference Figure 1 and Figure 2 During use, the battery 1 continues to heat up. When the heat dissipation unit cannot or cannot immediately transfer the heat, the battery 1 will experience thermal runaway, which will quickly spread to other parts of the battery module and the gas or flame ejected by the high-temperature air pressure will break through the liquid cooling plate 21. Therefore, the liquid cooling plate 21 is made of metal material, which can withstand the impact for a certain period of time and facilitate the escape of passengers.

[0052] like Figure 1 and Figure 2As shown, since the liquid cooling plate 21 is made of metal material and the battery 1 is also made of rigid material, although the liquid cooling plate 21 is arranged on one side of the battery pole 11, it is impossible to achieve complete contact, and the contact area largely determines the heat dissipation efficiency. Therefore, the heat dissipation unit includes the liquid cooling plate 21 and also includes a thermal pad 22. The thermal pad 22 is arranged between the pole 11 and the liquid cooling plate 21. The thermal pad 22 is in complete contact with the pole 11 and the liquid cooling plate 21 at the same time, so that the contact area is greatly improved, and the heat dissipation efficiency of the heat dissipation unit is further improved. Since the application environment of the thermal pad 22 is relatively special and needs to be applied to the battery module, the thermal pad 22 made of insulating material is selected.

[0053] Reference Figure 1 and Figure 2 In some embodiments provided in the present application, the battery module further includes a heat insulation plate 4, which is disposed on a side of the heat dissipation unit away from the pole 11. Because the liquid cooling plate 21 can be effectively isolated from contact with the outside air, the heat exchange of the heat dissipation unit is performed through one side of the battery 1, thereby improving the overall heat exchange efficiency, reducing heat loss, and improving the thermal insulation effect of the battery module.

[0054] like Figure 1 and Figure 2 As shown, when the heat insulation board 4 is a mica board (the mica board and the heat insulation board have the same number), the mica board 4 is composed of polysilicon muscovite, quartz, garnet and rutile, etc., and albite, zoisite and hard chlorite, etc. may appear. Garnet is rich in Fe and Mg, and the Si in polysilicon muscovite can reach 3.369, which has insulation and low-loss thermal resistance functions, and is also a good black body. The use of mica board 4 can play two roles. On the one hand, based on the low thermal conductivity of mica board 4, compared with the use of other types of heat insulation boards 4, it can effectively isolate the heat dissipation unit from the contact with the outside air, so that the heat exchange of the liquid cooling plate 21 is carried out through one side of the battery pole 11, which improves the overall heat exchange efficiency, reduces the heat loss, and improves the internal insulation effect of the battery 1. On the other hand, the strength and flame retardancy of the mica board 4 itself are good, which can play a certain protective effect when thermal runaway occurs. This prevents thermal runaway from spreading and diffusing from the top of the battery module to adjacent battery modules in a short period of time, thereby increasing the safety time of the battery pack.

[0055] Reference Figure 1 and Figure 2Specifically, the mica board 4 can be directly connected to the heat dissipation unit by pasting, or threaded holes can be opened on the heat dissipation unit and the mica board 4, and the mica board 4 can be fixed to the heat dissipation unit by bolts and threaded holes. A clamping part can also be provided on the mica board 4, and a buckling part can be provided on the heat dissipation unit. The mica board 4 can be buckled and connected to the heat dissipation unit by the clamping part and the buckling part 31. The mica board 4 can also be connected to the heat dissipation unit in other ways, and this application does not impose any restrictions on this.

[0056] In some other embodiments provided in this application, refer to Figure 1 and Figure 2 The electric energy required by the power system of the car is often not available from one battery module, and multiple battery modules need to be connected in parallel or in series to form a battery pack. However, each battery module is provided with a liquid cooling plate 21, and the liquid cooling plate 21 is filled with coolant. The liquid cooling plate 21 needs to flow through the liquid cooling plate 21 according to the parallel pipeline or series pipeline between the multiple battery modules. During the flow, the heat of the multiple battery modules is not exactly the same, resulting in different temperature differences between the liquid cooling plates 21, and there may be a large temperature difference. For this reason, the present application provides a preferred solution, and the liquid cooling plate 21 is provided with a water inlet 211 and a water outlet 212, and the water inlet 211 and the water outlet 212 are used to connect the hose. The hose can be designed according to the series pipeline or parallel pipeline between the multiple battery modules. In this way, the temperature difference between the liquid cooling plates 21 is reduced, resulting in a reduction in the temperature difference between the battery modules, further improving the thermal management efficiency of the battery module.

[0057] Specifically, Figure 2 and Figure 3 As shown, the water inlet 211 and the water outlet 212 should be arranged in pairs. The water inlet 211 and the water outlet 212 can be arranged in one pair or in multiple pairs. The specific number of settings depends on the series and parallel pipelines between multiple battery modules and the efficiency of heat dissipation required by the battery modules. Although the water inlet 211 and the water outlet 212 are arranged in pairs, the positions of the water inlet 211 and the water outlet 212 can be set at will. In order to facilitate processing and production, the positions of the water inlet 211 and the water outlet 212 are generally set on the same side.

[0058] For example, the water inlet 211 and the water outlet 212 are used to connect hoses, and the hoses need to be arranged according to the series relationship or parallel relationship between the liquid cooling plates 21. Therefore, the water inlet 211 and the water outlet 212 can be set on the side of the liquid cooling plate 21 away from the pole 11 to facilitate the connection of the hose, or they can be set on the side of the liquid cooling plate 21 close to the pole 11. When they are set on the side of the liquid cooling plate 21 away from the pole 11, the water pipe is arranged on the side of the liquid cooling plate 21 away from the pole 11, which increases the overall spatial height of the battery module and makes it impossible to install the heat insulation plate 4 on the outside. Therefore, the water inlet 211 and the water outlet 212 are set on the side of the liquid cooling plate 21 close to the pole 11, so that the water pipe is arranged on the lower side of the liquid cooling plate 21, which will not occupy the overall spatial height of the battery module, and can improve the space utilization of the battery module.

[0059] It should be noted that, refer to Figure 2 , Figure 3 and Figure 4 In the process of designing the battery 1, a pressure relief area 12 is provided on the battery 1. The thickness or pressure bearing capacity of the pressure relief area 12 is smaller than that of other parts of the battery 1. Of course, the minimum pressure bearing capacity of the pressure relief area 12 can ensure the normal use of the battery 1 and the normal operation of the liquid cooling system. The internal pressure is not enough to break through the fire extinguishing port 213, which can ensure the normal flow of the coolant. In case of thermal runaway of the battery 1, the hydraulic area will first open and spray gas, so that it will spread quickly to other battery modules. Therefore, a fire extinguishing port 213 is provided on the liquid cooling plate 21. The fire extinguishing port 213 corresponds to the position of the hydraulic area one by one. For example, the number of the fire extinguishing ports 213 can be set to one or more. When the battery 1 has a thermal runaway, the pressure relief area 12 opens and sprays high-temperature and high-pressure gas to break through the fire extinguishing port 213, so that the flame-retardant coolant is sprayed on the battery 1 having a thermal runaway through the fire extinguishing port 213, which has a certain flame retardant effect, delays the spread of thermal runaway, and increases the safety time of the battery module.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module, characterized in that: include: A battery, the battery comprising a terminal; A heat dissipation component, which is arranged on the pole and is used to dissipate heat from the battery; The heat dissipation assembly comprises a liquid cooling plate, the liquid cooling plate is filled with cooling liquid, and the liquid cooling plate is arranged on the pole; A pressure relief area is provided on one side of the battery where the pole is provided, for ejecting the gas inside the battery, and a fire extinguishing port is provided on the liquid cooling plate, and the positions of the fire extinguishing port and the pressure relief area correspond one to one, and the pressure relief area is opened to eject high-temperature and high-pressure gas that can break through the fire extinguishing port, so that the flame-retardant coolant is sprayed on the battery that has thermal runaway through the fire extinguishing port; A box body, wherein a receiving cavity is provided in the box body for receiving the battery, the box body is open, folded edges are provided on both sides of the liquid cooling plate, a buckling part is provided on the box body, and the folded edges cooperate with the buckling part to fix the liquid cooling plate on the box body; The liquid cooling plate is provided with a water inlet and a water outlet, and the water inlet and the water outlet are used to connect a hose; the hose is designed according to the series pipeline or parallel pipeline between the plurality of battery modules.

2. The battery module according to claim 1, characterized in that: The water inlet and the water outlet are arranged on a side of the liquid cooling plate close to the pole.

3. The battery module according to any one of claims 1 to 2, characterized in that: The liquid cooling plate is made of metal material.

4. The battery module according to claim 1, characterized in that: The heat dissipation unit comprises a heat conductive pad, which is made of an insulating material and is arranged between the pole and the liquid cooling plate, and is used for transferring the heat of the pole to the liquid cooling plate.

5. The battery module according to claim 1, characterized in that: A heat insulation board is included, and the heat insulation board is arranged on a side of the heat dissipation unit away from the pole.

6. A vehicle, characterized in that: include: Powertrain; The battery module according to any one of claims 1 to 5, wherein the battery module is electrically connected to the power system to provide electrical energy to the power system.

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