A battery assembly and battery heat management system

Abstract

The application discloses a battery assembly, which comprises a battery shell and a blade battery pack, the blade battery pack is arranged in the battery shell, further comprises a heat exchange module and a cooling liquid, the heat exchange module comprises a first heat exchange part and a second heat exchange part which are connected with each other, the first heat exchange part is in sealed contact with the battery pole of the blade battery pack, and the second heat exchange part covers the blade battery pack; the cooling liquid contacts the blade battery pack and the second heat exchange part; the application also discloses a battery heat management system, which further comprises: a sensor group, the sensor group is arranged in the battery shell and is close to the position of the blade battery pack, the sensor group comprises a plurality of liquid level sensors and a plurality of temperature sensors; and a control module, the control module receives signals of the sensor group and sends control instructions. The beneficial effects are that the cooling liquid and the heat exchange module based on the phase change material are arranged in the battery, heat dissipation of the battery is absorbed and managed, battery thermal runaway is avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

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

[0002] It is an important trend for new energy vehicles and other devices to use blade batteries. Blade batteries are a new type of battery technology, named for their shape like a blade, and are designed to improve energy density. The use of blade batteries involves battery heat dissipation and battery heat preservation problems, because blade batteries only have optimal energy density and capacity within a specific temperature range.

[0003] Based on the above conditions and the summary of the prior art in actual use, the current blade battery heat management has the following characteristics, defects and risks:

[0004] 1. Poor blade battery heat management, which leads to delayed heat dissipation, resulting in thermal runaway and self-ignition risk, posing a great threat to life and property safety;

[0005] 2. The structure of the blade battery tab on both sides is an important factor causing uneven temperature of the entire battery pack, which leads to local overheating of the battery and damages the battery life, 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 disposal of the coolant cause environmental pollution;

[0007] 4. During the battery heating process, the heat dissipated causes energy loss, resulting in energy waste;

[0008] 5. In severe cold environments, when the battery needs to be warmed up for use, external heating is required, which additionally increases the structure configuration and heat supplement, resulting in a complicated structure and increased energy cost.

[0009] Therefore, it is necessary to efficiently and stably manage the heat of the blade power battery.

[0010] The mainstream power battery cooling methods on the market include direct cooling, forced air cooling and liquid cooling plates. These cooling methods all have problems such as poor battery temperature uniformity and low cooling efficiency. The existing semi-submerged battery pack liquid cooling technology immerses the battery in a special coolant as the main form of direct liquid cooling, which absorbs the heat generated by the battery through the coolant.

[0011] Compared with the above, the semi-submerged liquid cooling directly contacts the battery with the cooling liquid, which not only greatly reduces the complexity of the system, but also eliminates the contact thermal resistance between the battery and the coolant. The existing special coolant has good antifreeze and heat dissipation performance, but it still cannot well solve the problems of poor battery self-heating, non-environmental cooling medium, etc.

[0012] Phase Change Microcapsules is a widely used technology in material science and engineering, mainly used to enhance the thermal management performance of materials, its core concept is to encapsulate phase change materials (PCM) in tiny capsules, which can undergo physical state changes at specific temperatures, such as from solid to liquid (or vice versa), this phase change process can absorb or release a large amount of heat, can absorb heat when the temperature reaches or exceeds a certain threshold, prevent overheating; and release heat when the temperature decreases, thereby alleviating the impact of temperature drop, using this feature to accurately and effectively regulate the temperature of the surrounding environment, it is considered to be a technology with wide application potential in the field of electronic product thermal management, such as in battery, circuit board and other components, to help control overheating, prolong product life and improve product performance. SUMMARY

[0013] One of the purposes of the present application is to address the above-mentioned poor thermal management of the blade battery, and further to cause the heat to be not timely, to cause the thermal runaway, and further to cause the risk of combustion, to cause great threat to the safety of life and property, and the structure of the tab on both sides of the blade battery is an important factor causing the temperature of the entire battery pack to be uneven, which also leads to local overheating of the battery, and further damages the service life of the battery, causing harm. The problem, a battery assembly is provided.

[0014] In order to achieve one of the above purposes, the technical scheme adopted by the present application is:

[0015] A battery assembly, comprising a battery shell and a blade battery pack, the blade battery pack is arranged in the battery shell, characterized in that it further comprises a heat exchange module and a cooling liquid, the heat exchange module comprises a first heat exchange part and a second heat exchange part connected to each other, the first heat exchange part is in sealing contact with the 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 pack 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 heat-conducting material, and the phase change material core is arranged in the material shell;

[0018] The second heat exchange part comprises 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 capillary structures to absorb the cooling liquid;

[0019] The material shell is in contact with the phase change material capsule unit to achieve heat exchange.

[0020] In some preferred embodiments, the film layer has the characteristics of a hydrophobic and air-permeable material;

[0021] The battery shell comprises a first shell plate, which is close to and positionally corresponding to the second heat exchange part;

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

[0023] In some preferred embodiments, the air outlet channel is connected with a negative pressure function mechanism to accelerate the outflow of gas from the battery shell.

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

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

[0026] A battery heat management system adopts the above battery assembly and further comprises:

[0027] A sensor group arranged in the battery shell and close to the position of the blade battery group, the sensor group comprising a plurality of liquid level sensors and a plurality of temperature sensors;

[0028] A control module receiving signals of the sensor group and issuing control instructions.

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

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

[0031] In some preferred embodiments, the battery shell is provided with a liquid injection port, the liquid injection port is provided with an electrically controlled valve, and the electrically controlled valve is electrically connected to the control module.

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

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

[0034] 1. Set the cooling liquid and the heat exchange module based on the phase change material into the battery to absorb and manage the battery heat dissipation, avoid the battery thermal runaway, and improve the safety of the battery;

[0035] 2. Set the cooling liquid and the heat exchange module based on the phase change material into the battery, cover the phase change material to the surface of the battery, and seal to the battery pole, use the characteristics of the phase change material to realize the uniform battery heat dissipation, and further improve the battery life, avoid the harm and risk caused by the uneven battery heating, and avoid the battery pole leakage at the same time;

[0036] 3. Use water as the cooling liquid, which can avoid environmental pollution when the cooling liquid is gasified and dissipated;

[0037] 4. Use water as the cooling liquid, which can be connected to the air conditioning system of the car after being heated and gasified for heating and humidifying in the car, realize energy recycling, and avoid waste;

[0038] 5. Set the cooling liquid and the heat exchange module based on the phase change material into the battery, use the phase change material to save energy, and when the battery cannot enter the working state due to cooling, the phase change material can realize the battery heat release and temperature rise, energy recycling, higher energy efficiency, and avoid the use cost caused by additional heating in the adaptive condition range. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural exploded view of an embodiment of the battery assembly in the present application.

[0040] Figure 2 is a schematic view of the arrangement structure of the phase change material capsule unit in an embodiment of the present application.

[0041] Figure 3 is a schematic view of the structure state of the second heat exchange part, the blade battery pack and the cooling liquid in an embodiment of the present application.

[0042] Figure 4 is a schematic view of the combination of the phase change material core and the material shell structure of the first heat exchange part in an embodiment of the present application.

[0043] Figure 5 is a schematic view of the setting structure of the negative pressure function mechanism in an embodiment of the present application.

[0044] Figure 6 is a schematic view of the connection structure of the control module, the heating module and the sensor group in the present application. DETAILED DESCRIPTION

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

[0046] Referring to Figures 1-5 As shown in the figure, a battery assembly includes a battery shell 100, a blade battery pack 200, a heat exchange module 300 and a cooling liquid 400. The blade battery pack 200 is used to provide electric energy, and the blade battery pack 200 and the heat exchange module 300 are both arranged in the battery shell 100. The battery shell 100 provides structural support and protection for the blade battery pack 200 and the heat exchange module 300. The cooling liquid 400 is a liquid heat exchange medium, which enters the battery shell 100 by injection, and cooperates with the heat exchange module 300 to jointly manage the heat generation of the blade battery pack 200 during heat exchange.

[0047] Referring to Figure 1 As shown in the figure, 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 realize heat exchange between each other through mutual connection.

[0048] The first heat exchange part 310 is sealingly connected to the battery pole of the blade battery pack 200, and timely disperses the heat energy generated at the battery pole outward, thereby cooling the battery pole, and at the same time, avoiding heat concentration, achieving 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 in a sealing connection manner, which has the beneficial effects of: 1. Avoiding the contact between the cooling liquid 400 and the battery pole, thereby avoiding the risk of electric leakage; 2. Based on the fact that the battery pole is a part of rapid temperature rise and high heat concentration, the first heat exchange part 310 can quickly transfer heat to reduce the temperature of the battery pole, thereby avoiding the occurrence of open fire combustion.

[0050] Referring to Figure 3 As shown in the figure, the second heat exchange part 320 covers the blade battery pack 200, and timely manages the heat generation of each part of the surface of the blade battery pack 200.

[0051] Referring to Figure 3 As shown in the figure, the cooling liquid 400 contacts the blade battery pack 200 and the second heat exchange part 320 to realize heat exchange between the blade battery pack 200 and the second heat exchange part 320, and efficiently manages the heat of the blade battery pack 200.

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

[0053] Referring 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 heat conductive material, and the phase change material core 311 is arranged in the material shell 312. The material shell 312 is used to contain and preserve the phase change material core 311. The phase change material core 311 is made of 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, the phase change from solid to liquid occurs, and during the melting process, the phase change material absorbs and stores a large amount of latent heat. When the phase change material cools down, the stored heat is released to the environment within a certain temperature range, and the reverse phase change from liquid to solid occurs. In these two phase change processes, the energy stored or released is called 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 is constant, the latent heat absorbed or released is quite large.

[0054] In 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 shaped as a plurality of fin-shaped heat dissipation structures. The material shell 312 made of metal has a plurality of fin-shaped structures, and then the heat dissipation is achieved through the fin-shaped structures.

[0056] Reference 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 absorb the cooling liquid 400 as capillary structures. The phase change material unit 322 is an independent phase change material capsule, which includes a capsule shell and a phase change material arranged in the capsule shell.

[0057] Reference Figure 3 As shown, the cooling liquid 400 is absorbed by the gaps 321 formed between the adjacent two phase change material capsule units 322. The gaps 321 provide capillary structures to absorb the cooling liquid 400 upward and make full contact with the phase change material capsule units 322, thereby completely and efficiently generating heat exchange.

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

[0059] In a 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 to evenly disperse the heat of the blade battery pack 200 during the heat dissipation process, achieve stable thermal management, avoid the damage and danger caused by heat concentration, improve battery life, and avoid property losses caused by spontaneous combustion of the battery due to heat concentration.

[0062] The phase change materials in the first heat exchange unit 310 and the second heat exchange unit 320 not only absorb heat from the coolant 400 and store it within the coolant, but also release heat to the coolant 400 when the coolant 400 temperature drops, which in turn heats the blade battery pack 200. This improves the efficiency of battery energy utilization, eliminating the need for additional heating to replenish heat within a certain energy demand range.

[0063] When the temperature of the blade battery pack 200 drops and is not conducive to operation, the phase change material 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 the 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 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 can be one or more of a polysulfone (PSF) membrane, a polyimide (PI) membrane, a polydimethoxysilane (PDMS) membrane, and a cellulose acetate (CA) membrane.

[0066] During specific implementation, the edges of the film layer 500 are bonded together to prevent the coolant 400 from leaking.

[0067] In some preferred embodiments, referring to Figure 5 As shown, the gas outlet passage 111 is connected with a negative pressure function mechanism 600 to accelerate the flow of gas out of the battery shell 100. The negative pressure function mechanism 600 can be any existing mechanism and device capable of providing air negative pressure, such as a bladeless fan, a bladed fan, etc. The negative pressure function mechanism 600 provides air negative pressure to accelerate the gas formed by the cooling liquid 400 to be discharged from the gas outlet passage 111, i.e. to accelerate the dissipation of heat energy out of the battery shell 100, thereby making the battery shell 100 cool down more quickly and efficiently.

[0068] In some preferred embodiments, the cooling liquid 400 is water. The use of water as the cooling liquid 400 has the following beneficial effects: 1. Water does not pollute the atmosphere after being vaporized and discharged into the atmosphere; 2. In extreme cases, such as abnormal high heat, impact and puncture, etc., when the battery produces combustion, since the boiling point of water is 100℃, water can be boiled to rapidly control the temperature within a reasonable range, and the fire can also be timely controlled, thereby achieving protection; 3. Water vapor formed after being heated can be introduced into the vehicle for humidification and temperature rise, thereby improving the heat utilization efficiency of the battery.

[0069] Referring to Figures 1-6 As shown, a battery heat management system adopts the above-mentioned battery assembly, and further comprises a sensor group 700 and a control module 800. The sensor group 700 is arranged in the battery shell 100 and is located close to the blade battery group 200. The sensor group 700 comprises a plurality of liquid level sensors 710 for detecting the depth of the cooling liquid 400 in the battery shell 100, and a plurality of temperature sensors 720 for detecting the temperature beside the blade battery group 200. The control module 800 receives signals from the sensor group 700, i.e. the liquid level sensors 710 and the temperature sensors 720, and generates control operations according to the received signals, and then sends 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 sends a first control instruction according to the obtained liquid level signal, and 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 sends a second control instruction according to the obtained temperature signal, and the second control instruction is a temperature adjustment instruction.

[0073] In some preferred embodiments, referring to Figure 1As shown, the air outlet passage 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 are formed into a three-way pipe structure, the main pipe 1111 is connected to the inside of the battery shell 100 through the air outlet hole 1114, each of the first branch pipe 1112 and the second branch pipe 1113 is provided with an electrically controlled 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, and the electrically controlled valve is electrically connected to the control module 800. The water vapor generated by the heating of the blade battery pack 200 in the above 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 electrically controlled valve is used to control the on-off 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, the 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 electrically controlled valve in the second branch pipe 1113, and the electrically controlled valve is opened;

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

[0076] The water vapor in the battery shell 100 enters the air conditioning system inside the vehicle through the air outlet hole 1114, the main pipe 1111 and the second branch pipe 1113.

[0077] In some preferred embodiments, referring to Figure 5 As shown, the main pipe 1111 is provided with a negative pressure function mechanism 600 to extract gas from the battery shell 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 capable of providing air negative pressure, such as a blade fan and a bladeless fan. The negative pressure function mechanism 600 provides air negative pressure to accelerate the gas formed by the cooling liquid 400 to be discharged from the air outlet passage 111, that is, to accelerate the dissipation of heat energy outside the battery shell 100, thereby making the battery shell 100 cool more quickly and efficiently. When the control module 800 controls the negative pressure function mechanism 600 to work, the method and process are as follows:

[0078] The control module 800 sends a fifth control instruction to the negative pressure function mechanism 600, the negative pressure function mechanism 600 starts to work and generates air negative pressure to accelerate the gas generated in the battery shell 100 to be discharged to the air outlet passage 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, which is provided with an electronically controlled valve, and the electronically controlled 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 electronically controlled 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 , which opens and starts to inject 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 liquid 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. The heating module 900 is disposed in the battery housing 100 for heating. 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, ensuring that the blade battery pack 200 can operate within the optimal temperature range.

Claims

1. A battery assembly comprising a battery housing (100) and a blade battery pack (200) disposed within the battery housing (100), characterized in that, Further comprising a heat exchange module (300) and a cooling liquid (400), the heat exchange module (300) comprises a first heat exchange part (310) and a second heat exchange part (320) connected with each other, the first heat exchange part (310) is in sealed contact with the battery poles of the blade battery pack (200), and the second heat exchange part (320) covers the blade battery pack (200); The cooling liquid (400) contacts the blade battery pack (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-conducting material, and the phase change material core (311) is arranged in the material shell (312); The second heat exchange part (320) comprises 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 cooling liquid (400); The material shell (312) is in contact with the phase change material capsule units (322) to achieve heat exchange.

2. A battery assembly as claimed in claim 1, wherein, Further comprising a film layer (500) having the properties of hydrophobic and air-permeable material; The battery shell (100) comprises a first shell plate (110) close to and corresponding in position to the second heat exchange part (320); The film 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 passage (111).

3. A battery assembly as claimed in claim 2, wherein the battery assembly is a battery pack. The air outlet passage (111) is connected with a negative pressure function mechanism (600) to accelerate the flow of gas out of the battery shell (100).

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

5. A battery heat management system, characterized by, The battery assembly as claimed in claim 2 further comprises: A sensor group (700) arranged in the battery shell (100) and close to the blade battery pack (200), the sensor group (700) comprises a plurality of liquid level sensors (710) and a plurality of temperature sensors (720); A control module (800) receiving signals from the sensor group (700) and issuing control instructions.

6. A battery heat management system as claimed in claim 5, wherein, The air outlet passage (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 shell (100) through the air outlet hole (1114), each of the first branch pipe (1112) and the second branch pipe (1113) is provided with an electrically controlled valve, one of the first branch pipe (1112) and the second branch pipe (1113) is used to connect to an air conditioning system inside a vehicle, and the electrically controlled valves are electrically connected to the control module.

7. A battery heat management system as claimed in claim 6, wherein, The main pipe (1111) is internally provided with a negative pressure function mechanism (600) for extracting gas from the battery shell (100), and the negative pressure function mechanism (600) is electrically connected to the control module (800).

8. A battery thermal management system as claimed in claim 5, wherein, The battery shell (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, wherein, Further comprising a heating module (900), the heating module (900) is arranged in the battery shell (100) for heating, and the heating module (900) is electrically connected to the control module (800).

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