Battery assembly and battery heating management system

Abstract

The battery assembly comprises a battery shell and a blade battery pack, the blade battery pack is arranged in the battery shell, the battery assembly further comprises a heat exchange module and cooling liquid, the heat exchange module comprises a first heat exchange part and a second heat exchange part which are connected with each other, and the first heat exchange part is in sealing contact with a battery pole of the blade battery pack; the second heat exchange part covers the blade battery pack; the cooling liquid is in contact with the blade battery pack and the second heat exchange part; the invention also discloses a battery heating management system, which further comprises a sensor group arranged in the battery shell and close to the blade battery pack, and the sensor group comprises a plurality of liquid level sensors and a plurality of temperature sensors; and the control module is used for receiving a signal of the sensor group and sending out a control instruction. The battery has the beneficial effects that the cooling liquid and the heat exchange module based on the phase-change material are arranged in the battery, so that heat dissipation of the battery is absorbed and managed, thermal runaway of the battery is avoided, and the safety of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery assembly and a battery heat management system. Background Art

[0002] The use of blade batteries in new energy vehicles and other devices is an important development trend. Blade batteries are a new type of battery technology, named because of their blade-like shape, and are designed to increase energy density. The use of blade batteries will involve the problem of battery heat dissipation and battery insulation, because blade batteries only have the best energy density and capacity within a specific temperature range.

[0003] Based on the above conditions and the summary of existing technologies in actual use, the thermal management of blade batteries currently has the following characteristics, defects and risks:

[0004] 1. Blade battery thermal management is poor, resulting in untimely heat dissipation, causing thermal runaway, which in turn brings the risk of spontaneous combustion, posing a great threat to the safety of life and property;

[0005] 2. The structure on both sides of the blade battery tab is an important factor causing uneven temperature of the entire battery pack, which leads to local overheating of the battery, thereby shortening the battery life and causing harm;

[0006] 3. In the battery pack liquid cooling technology, the battery is immersed in a special coolant to absorb the heat generated by the battery. The escape and treatment of the coolant will cause environmental pollution;

[0007] 4. When the battery is heated, the dissipated heat causes energy loss, resulting in energy waste;

[0008] 5. In severe cold environments, when the battery needs to be heated for use, external heating is required, which requires additional structural configuration and heat energy supplement, resulting in a cumbersome structure and increased energy costs.

[0009] Therefore, it is very necessary to carry out efficient and stable thermal management of blade-type power batteries.

[0010] The heat dissipation methods of mainstream power batteries in the market include direct cooling, forced air cooling and liquid cooling plates. All of the above heat dissipation methods have problems such as poor battery temperature uniformity and low heat dissipation efficiency. In the existing semi-immersed battery pack liquid cooling technology, the battery is immersed in a special coolant as the main form of direct liquid cooling, and the heat generated by the battery is absorbed by the coolant.

[0011] In contrast, semi-immersion liquid cooling not only greatly reduces the complexity of the system because the battery is in direct contact with the coolant, but also eliminates the contact thermal resistance between the battery and the coolant. The existing special coolants have good antifreeze and heat dissipation properties, but they still fail to solve the problems of poor thermal uniformity of the battery itself and environmentally unfriendly cooling fluids.

[0012] Phase Change Microcapsules are a widely used technology in materials science and engineering, mainly used to enhance the thermal management performance of materials. The core concept is to encapsulate phase change materials (PCM) in tiny capsules. This material will undergo a change in physical state at a specific temperature, such as from solid to liquid (or vice versa). This phase change process can absorb or release a large amount of heat. It can absorb heat when the temperature reaches or exceeds a certain threshold to prevent overheating; and release heat when the temperature drops, thereby alleviating the impact of temperature drop. This feature is used to accurately and effectively regulate the temperature of the surrounding environment. It is considered to be a technology with broad application potential in the field of thermal management of electronic products. For example, in components such as batteries and circuit boards, it helps control overheating, extend product life and improve product performance. Summary of the invention

[0013] One of the purposes of the present invention is to provide a battery assembly to address the problem that the blade battery has poor thermal management, which leads to untimely heat dissipation, thermal runaway, and the risk of spontaneous combustion, posing a great threat to the safety of life and property, and the structure on both sides of the blade battery ear is an important factor causing uneven temperature of the entire battery pack, which leads to local overheating of the battery, thereby damaging the battery life and causing harm.

[0014] In order to achieve one of the above purposes, the present invention adopts the following technical solution:

[0015] A battery assembly, comprising a battery housing and a blade battery pack, wherein the blade battery pack is arranged in the battery housing, and characterized in that it also comprises a heat exchange module and a coolant, wherein the heat exchange module comprises a first heat exchange part and a second heat exchange part connected to each other, wherein the first heat exchange part is in sealing contact with a battery pole of the blade battery pack, and the second heat exchange part covers the blade battery pack;

[0016] The cooling liquid contacts the blade battery group and the second heat exchange part to achieve heat transfer;

[0017] The first heat exchange part comprises a phase change material core and a material shell, the material shell is made of a heat conductive material, and the phase change material core is arranged in the material shell;

[0018] The second heat exchange part includes a plurality of phase change material capsule units in contact with each other, and gaps are formed between adjacent phase change material capsule units to serve as a capillary structure to absorb the coolant;

[0019] The material shell contacts the phase change material capsule unit to achieve heat exchange.

[0020] In some preferred embodiments, it further comprises a membrane layer having hydrophobic and breathable material properties;

[0021] The battery housing includes a first shell plate, the first shell plate is close to and located corresponding to the second heat exchange portion;

[0022] The membrane layer is arranged between the second heat exchange portion and the first shell plate, and the first shell plate is provided with an air outlet channel.

[0023] In some preferred embodiments, the gas outlet channel is connected to a negative pressure function mechanism to accelerate the flow of gas to the outside of the battery housing.

[0024] In some preferred embodiments, the cooling liquid is water.

[0025] The second object of the present invention is to provide a more accurate, intelligent and multifunctional battery heat management system based on the above-mentioned battery assembly. The specific technical solution is:

[0026] A battery heat management system adopts the above-mentioned battery assembly and further includes:

[0027] A sensor group, the sensor group is arranged in the battery housing and close to the blade battery group, the sensor group includes a plurality of liquid level sensors and a plurality of temperature sensors;

[0028] A control module receives signals from the sensor group and issues control instructions.

[0029] In some preferred embodiments, the air outlet channel includes a main pipe, a first branch pipe, a second branch pipe and an air outlet hole arranged on the first shell plate, the main pipe, the first branch pipe and the second branch pipe form a three-way pipe structure, the main pipe is connected to the battery housing through the air outlet hole, the first branch pipe and the second branch pipe are respectively provided with an electrically controlled valve, and one of the first branch pipe and the second branch pipe is used to connect to the air conditioning system inside the vehicle, and the electrically controlled valve is electrically connected to the control module.

[0030] In some preferred embodiments, a negative pressure function mechanism is provided in the main pipe to extract gas from the battery housing, and the negative pressure function mechanism is electrically connected to the control module.

[0031] In some preferred embodiments, a liquid injection port is provided on the battery housing, and an electric-controlled valve is provided at the liquid injection port, and the electric-controlled valve is electrically connected to the control module.

[0032] In some preferred embodiments, a heating module is further included, wherein the heating module is disposed in the battery housing for heating, and the heating module is electrically connected to the control module.

[0033] The beneficial effects of the present invention are:

[0034] 1. Coolant and heat exchange modules based on phase change materials are installed in the battery to absorb and manage the heat dissipation of the battery, avoid thermal runaway of the battery, and improve the safety of the battery;

[0035] 2. Coolant and heat exchange modules based on phase change materials are installed in the battery, the phase change materials are covered on the battery surface, and the seal is set on the battery pole. The characteristics of the phase change materials are used to achieve uniform heat dissipation of the battery, thereby improving the battery life, avoiding the hazards and risks caused by uneven heating of the battery, and avoiding leakage at the battery pole;

[0036] 3. Using water as the coolant can avoid polluting the environment when the coolant vaporizes and dissipates;

[0037] 4. Water is used as the coolant. After being heated and gasified, it can be connected to the car's air conditioning system for heating and humidification in the car, realizing energy recovery and avoiding waste;

[0038] 5. Set up coolant and heat exchange module based on phase change material in the battery, use phase change material to save energy. When the battery cools down and cannot enter the working state, the phase change material can release heat and heat up the battery, recycling energy with higher energy efficiency. Within the applicable conditions, it avoids the use cost caused by additional heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structural decomposition of a battery assembly in an embodiment of the present invention.

[0040] Figure 2 It is a schematic diagram of the arrangement structure of phase change material capsule units in one embodiment of the present invention.

[0041] Figure 3 It is a schematic diagram of the structural status of the second heat exchange part, the blade battery pack and the coolant in one embodiment of the present invention.

[0042] Figure 4 It is a schematic diagram of the combination structure of the phase change material core and the material shell of the first heat exchange part in one embodiment of the present invention.

[0043] Figure 5 It is a schematic diagram of the arrangement structure of the negative pressure function mechanism in one embodiment of the present invention.

[0044] Figure 6 It is a schematic diagram of the connection structure between the control module, the heating module and the sensor group of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with embodiments, but the present invention is not limited thereto.

[0046] refer to Figure 1-5 As shown, a battery assembly includes a battery housing 100, a blade battery pack 200, a heat exchange module 300 and a coolant 400. The blade battery pack 200 is used to provide electrical energy, and the blade battery pack 200 and the heat exchange module 300 are both arranged in the battery housing 100. The battery housing 100 provides structural support and protection for the blade battery pack 200 and the heat exchange module 300. The coolant 400 is a liquid heat exchange medium, which enters the battery housing 100 by injection, and in the heat exchange process, cooperates with the heat exchange module 300 to jointly manage the heat of the blade battery pack 200.

[0047] refer to Figure 1 As shown, the heat exchange module 300 includes a first heat exchange part 310 and a second heat exchange part 320 connected to each other. The first heat exchange part 310 and the second heat exchange part 320 are connected to each other to achieve heat exchange between each other.

[0048] The first heat exchange part 310 is in sealing contact with the battery pole of the blade battery pack 200, so as to timely disperse the heat energy generated at the battery pole to the outside, thereby cooling the battery pole. At the same time, it avoids heat concentration and achieves the effect of balancing the surface temperature of the blade battery pack 200.

[0049] In specific implementation, the first heat exchange part 310 is connected to the battery pole by a sealed connection, which has the following beneficial effects: 1. It avoids contact between the coolant 400 and the battery pole, thereby preventing the risk of leakage; 2. Since the battery pole is a part where the temperature rises rapidly and high heat is concentrated, the heat can be quickly transferred through the first heat exchange part 310 to reduce the temperature of the battery pole and avoid the generation of open flames.

[0050] refer to Figure 3 As shown, the second heat exchange part 320 covers the blade battery pack 200 to timely perform heat management on the heat generated at various locations on the surface of the blade battery pack 200 .

[0051] refer to Figure 3 As shown, the coolant 400 contacts the blade battery pack 200 and the second heat exchange portion 320 to achieve heat exchange between the blade battery pack 200 and the second heat exchange portion 320 , thereby efficiently achieving thermal management of the blade battery pack 200 .

[0052] In a specific implementation, the coolant 400 includes one or more of water, fluorinated liquid and cooling oil.

[0053] refer to Figure 4As shown, the first heat exchange part 310 includes a phase change material core 311 and a material shell 312. The material shell 312 is made of a heat-conducting material, and the phase change material core 311 is arranged in the material shell 312. The material shell 312 is used to accommodate and store the phase change material core 311. The phase change material core 311 is made of a phase change material. The phase change material has the ability to change its physical state within a certain temperature range. Taking the solid-liquid phase change as an example, when heated to the melting temperature, a phase change from solid to liquid occurs. During the melting process, the phase change material absorbs and stores a large amount of latent heat. When the phase change material cools, the stored heat must be dissipated to the environment within a certain temperature range, and a reverse phase change from liquid to solid is performed. In these two phase change processes, the energy stored or released is called the phase change latent heat. When the physical state changes, the temperature of the material itself remains almost unchanged before the phase change is completed, forming a wide temperature platform. Although the temperature remains unchanged, the latent heat absorbed or released is quite large.

[0054] In a specific implementation, the material shell 312 can be made of metal, such as aluminum alloy and copper, etc. The material shell 312 provides the overall structural characteristics of the first heat exchange part 310. The specific shape of the material shell 312 is adapted to the overall structural design of the battery.

[0055] In some preferred embodiments, the material shell 312 is made into a plurality of heat dissipation fins with heat dissipation effect. The material shell 312 made of metal has a plurality of fin structures, and then heat dissipation is achieved through the fin structures.

[0056] refer to Figure 2 and 3 As shown, the second heat exchange part 320 includes a plurality of phase change material capsule units 322 in contact with each other, and gaps 321 are formed between adjacent phase change material capsule units 322 to serve as capillary structures to absorb the coolant 400. The phase change material unit 322 is an independent phase change material capsule, which structurally includes a capsule shell and a phase change material disposed in the capsule shell.

[0057] refer to Figure 3 As shown, a gap 321 is formed between two adjacent phase change material capsule units 322 to absorb the coolant 400. The gap 321 provides a capillary structure to absorb the coolant 400 upward and generate sufficient contact with the phase change material capsule unit 322, thereby completely and efficiently generating heat exchange.

[0058] In the specific implementation, the capsule shell uses methyl methacrylate as the shell material. The phase change material capsule unit 322 uses n-nonadecane as the phase change material and is arranged in the capsule shell. The average diameter of a single phase change material capsule unit 322 is about 8.18 μm, of which n-nonadecane accounts for 60.3 wt%.

[0059] During specific implementation, in some embodiments, the overall shape of the capsule shell is spherical.

[0060] The material shell 312 contacts the phase change material capsule unit 322 to achieve heat exchange between the first heat exchange portion 310 and the second heat exchange portion 320 .

[0061] The above scheme utilizes the characteristics of phase change materials and the structural form of the first heat exchange part 310 and the second heat exchange part 320, and cooperates with the effect of the coolant 400, so that the heat of the blade battery pack 200 can be evenly dispersed during the heat dissipation process, achieving stable thermal management, avoiding damage and danger caused by heat concentration, improving battery life, and avoiding property losses caused by spontaneous combustion of the battery due to heat concentration.

[0062] The phase change material of the first heat exchange part 310 and the second heat exchange part 320 can not only absorb heat from the coolant 400 and store the heat energy in itself, but also release heat to the coolant 400 when the temperature of the coolant 400 decreases, and then heat the blade battery pack 200 through the coolant 400. This improves the utilization efficiency of battery energy, and within a certain energy demand range, there is no need for additional heating to supplement heat.

[0063] When the temperature of the blade battery pack 200 drops and is not conducive to operation, the phase change materials in the first heat exchange part 310 and the second heat exchange part 320 will also release heat energy and evenly heat the surface of the blade battery pack 200 to increase its temperature and restore it to a normal operating temperature range.

[0064] In some preferred embodiments, Figure 1 As shown, it also includes a membrane layer 500 having hydrophobic and breathable material properties. The membrane layer 500 cannot allow liquid to pass through according to its own material properties, but can allow gas to pass through. The battery housing 100 includes a first shell plate 110, and the first shell plate 110 is close to and corresponds to the position of the second heat exchange part 320. The membrane layer 500 is arranged between the second heat exchange part 320 and the first shell plate 110, and the first shell plate 110 is provided with an air outlet channel 111. In specific use, its working process and principle are: when the coolant 400 is not heated and exists in liquid form, it cannot pass through the membrane layer 500; when the coolant 400 is heated and converted into a gaseous form, it can pass through the membrane layer 500 and be discharged through the air outlet channel 111 on the first shell plate 110.

[0065] In a specific implementation, the material of the membrane layer 500 may be one or more of a polysulfone (PSF) membrane, a polyimide (PI) membrane, a polydimethoxysilane (PDMS) membrane, and a cellulose acetate (CA) membrane.

[0066] In a specific implementation, the edges of the film layer 500 are bonded and connected to ensure that the coolant 400 does not leak out.

[0067] In some preferred embodiments, reference Figure 5 As shown, the air outlet channel 111 is connected to a negative pressure function mechanism 600 to accelerate the flow of gas to the outside of the battery housing 100. The negative pressure function mechanism 600 can be any existing mechanism and device that can provide air negative pressure, such as a bladed fan and a bladeless fan. The negative pressure function mechanism 600 provides air negative pressure to accelerate the gas formed by the coolant 400 to be discharged from the air outlet channel 111, that is, to accelerate the dissipation of heat energy to the outside of the battery housing 100, thereby making the inside of the battery housing 100 cool more quickly and efficiently.

[0068] In some preferred embodiments, the coolant 400 is water. The beneficial effects of using water as the coolant 400 are: 1. After the water is gasified, it will not cause pollution when discharged into the atmosphere; 2. In extreme cases, such as abnormally high heat, impact and puncture, when the battery burns, since the boiling point of water is 100°C, water can be boiled for heat exchange, and the temperature can be quickly controlled within a reasonable range, and the fire can be controlled in time, thereby achieving protection; 3. After the water is heated, it forms water vapor, which can be introduced into the vehicle for humidification and heating in the vehicle, thereby improving the thermal utilization efficiency of the battery.

[0069] refer to Figure 1-6 As shown, a battery heat management system adopts the above-mentioned battery assembly and also includes a sensor group 700 and a control module 800. Among them, the sensor group 700 is arranged in the battery housing 100 and is close to the position of the blade battery pack 200. The sensor group 700 includes a plurality of liquid level sensors 710, and the liquid level sensor 710 is used to detect the depth of the coolant 400 in the battery housing 100; the sensor group 700 also includes a plurality of temperature sensors 720, and the temperature sensor 720 is used to detect the temperature next to the blade battery pack 200. The control module 800 receives signals from the sensor group 700, namely the liquid level sensor 710 and the temperature sensor 720, and generates control operations according to the received signals, and then issues control instructions.

[0070] In the specific implementation process, the process and method are as follows:

[0071] The liquid level sensor 710 obtains a liquid level signal and transmits the liquid level signal to the control module 800. The control module 800 issues a first control instruction according to the obtained liquid level signal. The first control instruction is a liquid level adjustment instruction.

[0072] The temperature sensor 720 obtains a temperature signal and transmits the temperature signal to the control module 800. The control module 800 issues a second control instruction according to the obtained temperature signal. The second control instruction is a temperature adjustment instruction.

[0073] In some preferred embodiments, reference Figure 1As shown, the air outlet channel 111 includes a main pipe 1111, a first branch pipe 1112, a second branch pipe 1113 and an air outlet hole 1114 provided on the first shell plate 110. The main pipe 1111, the first branch pipe 1112 and the second branch pipe 1113 form a three-way pipe structure. The main pipe 1111 is connected to the battery housing 100 through the air outlet hole 1114. The first branch pipe 1112 and the second branch pipe 1113 are each provided with an electric control valve, and one of the first branch pipe 1112 and the second branch pipe 1113 is used to connect the air conditioning system inside the vehicle, and the electric control valve is electrically connected to the control module 800. The water vapor generated by the heat of the blade battery pack 200 in the above-mentioned battery assembly enters the first branch pipe 1112 or / and the second branch pipe 1113 through the air outlet hole 1114 and the main pipe 1111, and then enters other environments. The electric control valve is used to control the opening and closing of the first branch pipe 1112 and the second branch pipe 1113. Taking the second branch pipe 1113 connected to the air conditioning system inside the vehicle as an example, water vapor is introduced into the air conditioning system of the vehicle, and the control method is as follows:

[0074] The control module 800 sends a third control instruction to the electric control valve in the second branch pipe 1113, and the electric control valve opens;

[0075] The control module 800 sends a fourth control instruction to the electric control valve in the first branch pipe 1112, and the electric control valve is closed;

[0076] The moisture in the battery housing 100 enters the air conditioning system inside the vehicle through the vent 1114 , the main pipe 1111 and the second branch pipe 1113 .

[0077] In some preferred embodiments, reference Figure 5 As shown, a negative pressure function mechanism 600 is provided in the main pipe 1111 to extract gas from the battery housing 100, and the negative pressure function mechanism 600 is electrically connected to the control module 800. The negative pressure function mechanism 600 can be any existing mechanism and device that can provide air negative pressure, such as a bladed fan and a bladeless fan. The negative pressure function mechanism 600 provides air negative pressure to accelerate the gas formed by the coolant 400 to be discharged from the air outlet channel 111, that is, to accelerate the dissipation of heat energy outside the battery housing 100, thereby making the battery housing 100 cool down more quickly and efficiently. When the control module 800 controls the operation of the negative pressure function mechanism 600, its method and process are as follows:

[0078] The control module 800 sends a fifth control instruction to the negative pressure function mechanism 600, and the negative pressure function mechanism 600 starts and generates air negative pressure to accelerate the gas generated in the battery housing 100 to be discharged to the gas outlet channel 111;

[0079] The control module 800 sends a sixth control instruction to the negative pressure function mechanism 600, and the negative pressure function mechanism 600 is closed.

[0080] In some preferred embodiments, reference Figure 1 As shown, the battery housing 100 is provided with a liquid injection port 120, and the liquid injection port 120 is provided with an electric control valve, and the electric control valve is electrically connected to the control module 800. The liquid injection port 120 is used to inject the coolant 400. When the control module 800 controls the electric control valve of the liquid injection port 120, its method and process are as follows:

[0081] The control module 800 sends a seventh control instruction to the electronically controlled valve in the liquid injection hole 120, and the electronically controlled valve opens to start injecting the coolant 400 into the battery housing 100 from the outside;

[0082] The control module 800 sends an eighth control instruction to the electrically controlled valve in the injection hole 120, and the electrically controlled valve is closed.

[0083] In some preferred embodiments, reference Figure 6 As shown, a heating module 900 is also included, and the heating module 900 is arranged in the battery housing 100 for heating, and the heating module 900 is electrically connected to the control module 800. The heating module 900 is mainly used to heat the coolant 400, so as to transfer heat to the blade battery pack 200 through the coolant 400, so as to ensure that the blade battery pack 200 can work within the optimal temperature range.

Claims

1. A battery assembly, comprising a battery housing (100) and a blade battery pack (200), wherein the blade battery pack (200) is arranged in the battery housing (100), characterized in that: It also includes a heat exchange module (300) and a coolant (400), wherein the heat exchange module (300) includes a first heat exchange portion (310) and a second heat exchange portion (320) that are connected to each other, wherein the first heat exchange portion (310) is in sealing contact with a battery pole of the blade battery pack (200), and the second heat exchange portion (320) covers the blade battery pack (200); The cooling liquid (400) contacts the blade battery group (200) and the second heat exchange part (320) to achieve heat transfer; The first heat exchange part (310) comprises a phase change material core (311) and a material shell (312); the material shell (312) is made of a heat conductive material, and the phase change material core (311) is arranged in the material shell (312); The second heat exchange portion (320) includes a plurality of phase change material capsule units (322) that are in contact with each other, and gaps (321) are formed between adjacent phase change material capsule units (322) to serve as a capillary structure to absorb the cooling liquid (400); The material shell (312) contacts the phase change material capsule unit (322) to achieve heat exchange.

2. A battery assembly as claimed in claim 1, characterized in that: Also included is a membrane layer (500) having hydrophobic and breathable material properties; The battery housing (100) comprises a first shell plate (110), wherein the first shell plate (110) is close to and located corresponding to the second heat exchange portion (320); The membrane layer (500) is arranged between the second heat exchange portion (320) and the first shell plate (110), and the first shell plate (110) is provided with an air outlet channel (111).

3. A battery assembly as claimed in claim 2, characterized in that: The gas outlet channel (111) is connected to a negative pressure function mechanism (600) to accelerate the flow of gas out of the battery housing (100).

4. A battery assembly as claimed in claim 1, characterized in that: The cooling liquid (400) is water.

5. A battery heat management system, characterized in that: The battery assembly according to claim 2 further comprises: A sensor group (700), the sensor group (700) being arranged in the battery housing (100) and close to the blade battery group (200), the sensor group (700) comprising a plurality of liquid level sensors (710) and a plurality of temperature sensors (720); A control module (800), wherein the control module (800) receives signals from the sensor group (700) and issues control instructions.

6. A battery heat management system as claimed in claim 5, characterized in that: The air outlet channel (111) comprises a main pipe (1111), a first branch pipe (1112), a second branch pipe (1113) and an air outlet hole (1114) arranged on the first shell plate (110); the main pipe (1111), the first branch pipe (1112) and the second branch pipe (1113) form a three-way pipe structure; the main pipe (1111) is connected to the battery housing (100) through the air outlet hole (1114); the first branch pipe (1112) and the second branch pipe (1113) are each provided with an electric control valve, and one of the first branch pipe (1112) and the second branch pipe (1113) is used to connect to the air conditioning system inside the vehicle; the electric control valve is electrically connected to the control module.

7. A battery heat management system as claimed in claim 6, characterized in that: A negative pressure function mechanism (600) is provided in the main pipe (1111) to extract gas from the battery housing (100), and the negative pressure function mechanism (600) is electrically connected to the control module (800).

8. A battery heat management system as claimed in claim 5, characterized in that: The battery housing (100) is provided with a liquid injection port (120), the liquid injection port (120) is provided with an electric control valve, and the electric control valve is electrically connected to the control module (800).

9. A battery thermal management system as claimed in claim 5, characterized in that: It also includes a heating module (900), which is arranged in the battery housing (100) for heating, and the heating module (900) is electrically connected to the control module (800).

Images