Cooling system, control method thereof and automobile

Abstract

The invention discloses a cooling system, a control method thereof and an automobile, the cooling system comprises a first branch circuit, a second branch circuit, a third branch circuit and an on-off control device, the third branch circuit is provided with a power battery, the power battery comprises a battery cooling plate and a battery cell in thermal conduction connection with the battery cooling plate, and the battery cell is connected with the first branch circuit and the second branch circuit. And a cooling channel connected in the third branch is formed in the battery cooling plate. The on-off control device controls the on-off between the second branch and the first branch, and controls the on-off between the third branch and the first branch. And a refrigerating medium circulates in the cooling system. The power battery is added to an existing cooling assembly, a set of cooling medium and a cooling heat exchange unit do not need to be independently provided for the power battery, the on-off control device is arranged, and on-off of the second branch and the third branch can be achieved. In addition, the space occupied by the whole cooling system is smaller than that occupied by two sets of refrigeration units, and optimization of the internal space layout of the vehicle is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of power batteries, and in particular to a cooling system, a control method thereof and a vehicle. Background Art

[0002] With the promotion and sales of new energy vehicles increasing year by year, accidents of vehicle fires caused by battery thermal runaway have occurred frequently. The thermal safety of the battery system has become an important factor affecting the application of new energy vehicles.

[0003] In the safety design of existing battery systems, thermal insulation pads are usually added between the cells in the power battery to delay the spread of heat from a single cell to adjacent cells after thermal runaway. However, after a single cell experiences thermal runaway, the high-temperature gas generated accumulates in the battery pack, and long-term accumulation can easily cause thermal runaway in other cells, resulting in thermal diffusion and even vehicle fire.

[0004] Therefore, there is an urgent need for a battery fire extinguishing system to solve the problem of fire caused by heat diffusion after thermal runaway of a single battery cell in the existing battery system. Summary of the invention

[0005] The main purpose of the present invention is to provide a cooling system, a control method thereof and a vehicle, which adopts inert gas as a cooling medium for a power battery, aiming to improve the cooling efficiency during fire extinguishing.

[0006] To achieve the above object, the present invention provides a cooling system, comprising:

[0007] A first branch, on which a compressor and a condenser are arranged;

[0008] a second branch having an evaporator disposed thereon;

[0009] a third branch, on which a power battery is arranged, the power battery comprising a battery cooling plate and a battery cell thermally connected to the battery cooling plate, the battery cooling plate having a cooling channel connected to the third branch; and

[0010] an on-off control device, controlling the on-off between the second branch and the first branch, and controlling the on-off between the third branch and the first branch;

[0011] Wherein, a refrigerant medium flows in the cooling system.

[0012] In one embodiment, the on-off control device comprises:

[0013] A first control valve is arranged on the second branch; and

[0014] The second control valve is arranged on the third branch.

[0015] In one embodiment, the power battery includes a housing, and the housing is provided with an input port and an output port;

[0016] One end of the cooling channel is connected to the third branch through the input port, and the other end is connected to the third branch through the output port.

[0017] Furthermore, a first connecting pipeline is provided between the cooling channel and the input port, and a second connecting pipeline is provided between the cooling channel and the output port;

[0018] A pressure relief electric control valve is provided on the first connecting pipeline;

[0019] The cooling system also includes a thermal runaway monitoring device for detecting the thermal runaway state of the battery cell, and a battery management controller electrically connected to the thermal runaway monitoring device and the pressure relief electric control valve. The battery management controller is also electrically connected to the on-off control device to control the disconnection between the second branch and the first branch, control the connection between the third branch and the first branch, and control the opening of the pressure relief electric control valve to spray refrigerant when thermal runaway occurs in the battery cell.

[0020] In one embodiment, the refrigerant medium comprises an inert gas.

[0021] Preferably, the inert gas is carbon dioxide.

[0022] In one embodiment, a first expansion valve is disposed on the second branch; and / or a second expansion valve is disposed on the third branch.

[0023] The present invention also provides a control method for the cooling system, and the control method for the cooling system comprises the following steps:

[0024] receiving a control instruction, and controlling the cooling system to enter a corresponding working mode according to the control instruction, wherein the working mode includes a battery cooling mode, a refrigeration mode, and a mixed mode;

[0025] When the working mode is the battery cooling mode, the on-off control device is controlled to connect the third branch with the first branch, and disconnect the second branch from the first branch;

[0026] When the working mode is the cooling mode, the on-off control device controls the second branch to be connected with the first branch, and the third branch to be disconnected from the first branch;

[0027] When the working mode is the mixed mode, the on-off control device controls the second branch to be connected to the first branch, and the third branch to be connected to the first branch.

[0028] The working mode also includes a fire extinguishing mode;

[0029] After receiving a control instruction and controlling the cooling system to enter a fire extinguishing mode according to the control instruction, the method further includes:

[0030] The on-off control device controls the third branch to be connected with the first branch, the second branch to be disconnected from the first branch, and controls the pressure relief electric control valve to open to spray the refrigerant medium.

[0031] The present invention also provides a vehicle comprising the cooling system.

[0032] The technical solution of the present invention adds the power battery to the existing cooling assembly (i.e., the compressor and condenser on the first branch, and the evaporator on the second branch), so there is no need to provide a set of cooling medium and cooling heat exchange unit for the power battery separately, and through the on-off control device, the on-off of the second branch and the third branch can be realized in different working modes (cabin cooling and power battery cooling). When the working mode is the battery cooling mode, the on-off control device is controlled to control the third branch to be connected with the first branch, and the second branch is disconnected from the first branch; when the working mode is the cooling mode, the on-off control device is controlled to control the second branch to be connected with the first branch, and the third branch is disconnected from the first branch; when the working mode is the mixed mode, the on-off control device is controlled to control the second branch to be connected with the first branch, and the third branch is connected with the first branch. In addition, the power battery is merged into the first branch and the second branch through the third branch, and the space occupied by the system is smaller than that of two sets of refrigeration units, which helps to optimize the internal space layout of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 A schematic structural diagram of an embodiment of a cooling system provided by the present invention;

[0035] Figure 2 for Figure 1 Schematic diagram of the structure of the power battery;

[0036] Figure 3 A schematic flow chart of different working modes of the cooling system control method provided by the present invention.

[0037] Description of Figure Numbers:

[0038] 100. Cooling system; 101. First branch; 102. Second branch; 103. Third branch; 1. Compressor; 2. Condenser; 3. Evaporator; 4. Power battery; 41. Battery cooling plate; 42. Battery cell; 43. Shell; 431. Input port; 432. Output port; 44. Pressure relief electric control valve; 45. Thermal runaway monitoring device; 46. Battery management controller; 5. First control valve; 6. Second control valve; 7. First expansion valve; 8. Second expansion valve; 9. Cooling fan.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] In the prior art, when the cells in the power battery experience thermal runaway, liquid cooling plates are mostly used for thermal management, and the liquid cooling plates are mostly laid at the bottom of the battery box, resulting in low cooling efficiency for the power battery. In pure electric buses, a dedicated battery fire extinguisher will be installed in the power battery pack, but the fire extinguishing range is small, and the battery fire extinguisher also requires additional space and increased costs. In response to the defects of the prior art, the present application associates the power battery with the existing cooling assembly, and uses a direct cooling (gas as a refrigerant medium) system for power battery thermal runaway fire extinguishing, which has high efficiency, directly sprays gas for cooling, and improves the fire extinguishing and cooling efficiency, thereby improving the overall safety of the battery pack and avoiding the safety risk of a single cell thermal runaway igniting other materials.

[0044] See also Figure 1 and Figure 2 The present invention proposes a cooling system 100, comprising a first branch 101, a second branch 102, a third branch 103, and an on-off control device; a compressor 1 and a condenser 2 are arranged on the first branch 101; an evaporator 3 is arranged on the second branch 102; a power battery 4 is arranged on the third branch 103, the power battery 4 comprises a battery cooling plate 41, and a battery cell 42 thermally connected to the battery cooling plate 41, and a cooling channel connected to the third branch 103 is formed in the battery cooling plate 41; the on-off control device controls the on-off between the second branch 102 and the first branch 101, and controls the on-off between the third branch 103 and the first branch 101. Wherein, a refrigerant medium flows in the cooling system 100. The power battery 4 is added to the existing cooling assembly (i.e., the compressor 1, the condenser 2, and the evaporator 3 on the first branch 101 and the second branch 102), and there is no need to provide a refrigeration unit for the power battery 4 separately. Moreover, the on-off control device provided can realize the on-off of the second branch 102 and the third branch 103 in different working modes (cabin cooling and power battery cooling). When the working mode is the battery cooling mode, the on-off control device is controlled to control the third branch 103 to be connected with the first branch 101, and the second branch 102 to be disconnected from the first branch 101; when the working mode is the cooling mode, the on-off control device is controlled to control the second branch 102 to be connected with the first branch 101, and the third branch 103 to be disconnected from the first branch 101; when the working mode is the mixed mode, the on-off control device is controlled to control the second branch 102 to be connected with the first branch 101, and the third branch 103 to be connected with the first branch 101. In addition, the power battery 4 is integrated into the first branch 101 and the second branch 102 through the third branch 103, and the space occupied by the system is smaller than that of two separate refrigeration units, which helps to optimize the internal space layout of the vehicle.

[0045] In one embodiment of the present invention, the on-off control device includes a first control valve 5 provided on the second branch 102 and a second control valve 6 provided on the third branch 103. The on-off of the passage can be realized by the provided control valves, providing the possibility of selecting different working modes.

[0046] In another embodiment of the present invention, the on-off control device includes a first three-way valve arranged on the second branch 102 and a second three-way valve arranged on the third branch 103, and the on-off of the passage can be achieved by the arranged three-way valves.

[0047] In one embodiment of the present invention, the power battery 4 includes a housing 43, and an input port 431 and an output port 432 are provided on the housing 43; one end of the cooling channel is connected to the third branch 103 through the input port 431, and the other end is connected to the third branch 103 through the output port 432. The housing 43 can integrate the battery cooling plate 41 and the battery cell 42. The power battery 4 can be connected to the third branch 103 through the input port 431 and the output port 432, so as to realize the transmission of the cooling medium.

[0048] In one embodiment of the present invention, a first connecting pipeline is provided between the cooling channel and the input port 431, and a second connecting pipeline is provided between the cooling channel and the output port 432; a pressure relief electric control valve 44 is provided on the first connecting pipeline; the cooling system 100 further includes a thermal runaway monitoring device 45 for detecting the temperature of the battery cell, and a battery management controller 46 electrically connected to the thermal runaway monitoring device 45 and the pressure relief electric control valve 44, and the battery management controller 46 is also electrically connected to the on-off control device, and is used to control the disconnection between the second branch 102 and the first branch 101, and control the connection between the third branch 103 and the first branch 101, and control the pressure relief electric control valve 44 to open to spray the refrigerant when the thermal runaway of the battery cell 42 occurs. Controlling the pressure relief electric control valve 44 to open can quickly release the refrigerant into the power battery 4 to reduce the temperature of the battery cell 42, which helps to quickly respond to abnormal temperature conditions. The battery management controller 46 is used to detect the temperature, voltage and current of the battery cell 42, control charging and discharging, receive the signal of the thermal runaway monitoring device 45, judge the thermal runaway state of the battery, and extinguish the battery by controlling the on-off control device when a thermal runaway abnormality occurs. The whole process is automatically controlled by controlling the pressure relief electric control valve 44, reducing the need for manual intervention.

[0049] In one embodiment of the present invention, the battery management controller 46 is a battery management system (BMS) or an energy management system (EMS).

[0050] In one embodiment of the present invention, the refrigerant medium includes an inert gas. The inert gas may be R134a, R1234yf, and carbon dioxide. The inert gas is non-flammable and non-explosive, which can reduce the fire risk of the automobile cooling system 100 and improve the safety of the vehicle; at the same time, the inert gas has high thermal stability and is not prone to chemical reactions, which can maintain the long-term stable operation of the cooling system 100.

[0051] Specifically, the inert gas is carbon dioxide, which is abundant in sources and cheap, and can reduce the operating cost of the automobile cooling system 100 .

[0052] In one embodiment of the present invention, a first expansion valve 7 is provided on the second branch 102; the first expansion valve 7 can adjust the flow rate of the refrigerant according to the needs of the cooling system 100 to ensure the stability of the refrigerant circulation in the system. Through the throttling effect of the first expansion valve 7, the refrigerant medium in a high-pressure state is converted into a refrigerant medium in a medium-pressure state, so that the refrigerant medium maintains an appropriate pressure in different components.

[0053] The second expansion valve 8 is provided on the third branch 103. The second expansion valve 8 can adjust the flow of the refrigerant according to the needs of the cooling system 100 to ensure the stability of the refrigerant circulation inside the system. Through the throttling effect of the second expansion valve 8, the refrigerant medium in the high-pressure state is converted into the refrigerant medium in the medium-pressure state, so that the refrigerant medium maintains a suitable pressure in different components. The second expansion valve 8 also has a certain safety protection function. When the pressure of the cooling system 100 is abnormal, the flow of the refrigerant can be limited or cut off to protect the system from damage.

[0054] In one embodiment of the present invention, a cooling fan 9 is further provided adjacent to the condenser 2. The cooling fan 9 can help the condenser 2 to dissipate heat faster, thus saving time.

[0055] The present invention also provides a control method of the cooling system 100, wherein the cooling system 100 includes a first branch 101, a second branch 102, a third branch 103, and an on-off control device; a compressor 1 and a condenser 2 are arranged on the first branch 101; an evaporator 3 is arranged on the second branch 102; a power battery 4 is arranged on the third branch 103, the power battery 4 includes a battery cooling plate 41, and a battery cell 42 thermally connected to the battery cooling plate 41, and a cooling channel connected to the third branch 103 is formed in the battery cooling plate 41; the on-off control device controls the on-off between the second branch 102 and the first branch 101, and controls the on-off between the third branch 103 and the first branch 101. A refrigerant medium flows in the cooling system 100.

[0056] The implementation process of the control method of the present invention is described by taking the above cooling system 100 as an example. Figure 1 and Figure 2 , the method comprises the following steps:

[0057] Step S10, receiving a control instruction, and controlling the cooling system 100 to enter a corresponding working mode according to the control instruction, wherein the working mode includes a battery cooling mode, a refrigeration mode, and a mixed mode;

[0058] Step S20: When the working mode is the battery cooling mode, the on-off control device controls the third branch 103 to be connected with the first branch 101, and the second branch 102 to be disconnected from the first branch 101;

[0059] Step S30: When the working mode is the cooling mode, the on-off control device controls the second branch 102 to be connected with the first branch 101, and the third branch 103 to be disconnected from the first branch 101;

[0060] Step S40 , when the working mode is the mixed mode, the on-off control device controls the second branch 102 to be connected to the first branch 101 , and the third branch 103 to be connected to the first branch 101 .

[0061] The on-off control device can control the connectivity of each pipeline under different working modes, and can quickly switch the working mode, thereby improving the overall work efficiency.

[0062] The on-off control device includes: a first control valve 5, which is arranged on the second branch 102; and a second control valve 6, which is arranged on the third branch 103. A first expansion valve 7 is arranged on the second branch 102; a second expansion valve 8 is arranged on the third branch 103. A pressure relief electric control valve 44 is arranged on the first connecting pipeline; and a cooling fan 9 is also arranged adjacent to the condenser 2.

[0063] In one embodiment of the present invention, when in battery cooling mode, the first control valve 5 arranged on the second branch 102 is closed, and the second control valve 6 arranged on the third branch 103 is opened. At this time, the refrigerant medium in the first branch 101 is pressurized by the compressor 1 into a high-temperature and high-pressure gas, and then dissipated through the condenser 2; the cooling fan 9 is started to take away the heat of the condenser 2, and the cooling medium becomes a high-temperature and high-pressure liquid after dissipating the heat through the condenser 2; then, after passing through the second control valve 6 and the second expansion valve 8, it becomes a low-temperature and medium-pressure gas-liquid mixed state, and enters the battery cooling plate 41 through the pressure relief electric control valve 44 to vaporize and absorb the heat of the battery cell 42, thereby cooling the power battery.

[0064] In one embodiment of the present invention, when in cooling mode, the first control valve 5 arranged on the second branch 102 is opened, and the second control valve 6 arranged on the third branch 103 is closed. The refrigerant medium in the first branch 101 is pressurized into a high-temperature and high-pressure gas by the compressor 1, and then dissipated through the condenser 2; the cooling fan 9 is started to take away the heat of the condenser 2, and the cooling medium becomes a high-temperature and high-pressure liquid after dissipating the heat through the condenser 2; then, after passing through the first control valve 5 and the first expansion valve 7, it becomes a low-temperature and medium-pressure gas-liquid mixed state, and finally further vaporizes through the evaporator 9 to absorb the heat of the passenger compartment.

[0065] When in the mixed mode, the first control valve 5 arranged on the second branch 102 and the second control valve 6 arranged on the third branch 103 are opened at the same time, and the refrigerant in the first branch 101 is pressurized into a high-temperature and high-pressure gas by the compressor 1, and then dissipated through the condenser 2; the cooling fan 9 is started to take away the heat of the condenser 2, and the refrigerant becomes a high-temperature and high-pressure liquid after dissipating the heat through the condenser 2. A part of the high-temperature and high-pressure liquid refrigerant passes through the first control valve 5 and the first expansion valve 7, and becomes a low-temperature and medium-pressure gas-liquid mixed state, and finally passes through the evaporator 9 to further gasify and absorb the heat of the passenger compartment; another part of the high-temperature and high-pressure liquid refrigerant passes through the second control valve 6 and the second expansion valve 8, and becomes a low-temperature and medium-pressure gas-liquid mixed state, and enters the battery cooling plate 41 through the pressure relief electric control valve 44 to gasify and absorb the heat of the battery cell 42, thereby cooling the power battery.

[0066] The power battery 4 also includes a thermal runaway monitoring device 45 for detecting the thermal runaway state of the battery cell 42, and a battery management controller 46 for detecting the battery cell temperature and performing various functions; the battery management controller 46 is used to control the on-off control device, and when the battery cell 42 has thermal runaway, controls the second branch 102 and the first branch 101 to be disconnected, controls the third branch 103 and the first branch 101 to be connected, and controls the pressure relief electric control valve 44 to open to inject the refrigerant.

[0067] In one embodiment of the present invention, the working mode also includes a fire extinguishing mode. In this mode, the following steps are included:

[0068] After receiving the control instruction and controlling the cooling system 100 to enter the fire extinguishing mode according to the control instruction, the method further includes:

[0069] Step S50, the on-off control device controls the third branch 103 to be connected with the first branch 101, the second branch 102 to be disconnected from the first branch 101, and controls the pressure relief electric control valve 44 to open to spray the refrigerant. The compressor 1 and the condenser 2 are turned on and operated; the refrigerant becomes a high-temperature and high-pressure gas after being pressurized by the compressor 1, and then flows through the condenser 2 to dissipate heat; the refrigerant becomes a high-temperature and high-pressure liquid after dissipating heat through the condenser 2, and then passes through the second control valve 6 and the second expansion valve 8 to become a low-temperature and medium-pressure gas-liquid mixed state, and then enters the cooling pipe through the input port of the power battery 4, and the battery management controller 46 controls the pressure relief electric control valve 44 to open, and the refrigerant is sprayed into the inside of the power battery 4 through the pressure relief electric control valve 44, and the refrigerant gasifies in the power battery 4 to absorb heat and extinguish the fire.

[0070] The refrigerant medium includes a gaseous component, and the gaseous refrigerant medium can be quickly released through the pressure relief electric control valve 44. It can not only reduce the temperature of the combustion area to below the ignition point of the combustible material through heat absorption, but also use the gaseous refrigerant medium to reduce the concentration of the combustible gas to below the level required for combustion.

[0071] The present invention also proposes an automobile, comprising the cooling system 100. The specific structure of the cooling system 100 refers to the above-mentioned embodiment. Since the automobile adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0072] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooling system (100), It is characterized in that include: A first branch (101) on which a compressor (1) and a condenser (2) are arranged; a second branch (102) on which an evaporator (3) is disposed; a third branch (103) on which a power battery (4) is arranged, the power battery (4) comprising a battery cooling plate (41) and a battery cell (42) thermally connected to the battery cooling plate (41), the battery cooling plate (41) having a cooling channel formed therein and connected to the third branch (103); and, an on-off control device for controlling the on-off between the second branch (102) and the first branch (101), and controlling the on-off between the third branch (103) and the first branch (101); Wherein, a refrigerant medium flows in the cooling system (100).

2. The cooling system (100) according to claim 1, It is characterized in that The on-off control device comprises: a first control valve (5), arranged on the second branch (102); and The second control valve (6) is arranged on the third branch (103).

3. The cooling system (100) according to claim 1, It is characterized in that The power battery (4) comprises a housing (43), and the housing (43) is provided with an input port (431) and an output port (432); One end of the cooling channel is connected to the third branch (103) through the input port (431), and the other end is connected to the third branch (103) through the output port (432).

4. The cooling system (100) according to claim 3, It is characterized in that A first connecting pipeline is provided between the cooling channel and the input port (431), and a second connecting pipeline is provided between the cooling channel and the output port (432); The first connecting pipeline is provided with a pressure relief electric control valve (44); The cooling system (100) further comprises a thermal runaway monitoring device (45) for detecting a thermal runaway state of the battery cell (42), and a battery management controller (46) electrically connected to the thermal runaway monitoring device (45) and the pressure relief electric control valve (44). The battery management controller (46) is also electrically connected to the on / off control device, and is used to control the second branch (102) and the first branch (101) to be disconnected when the battery cell (42) experiences thermal runaway, and to control the third branch (103) to be connected to the first branch (101), and to control the pressure relief electric control valve (44) to be opened to spray a refrigerant.

5. The cooling system (100) according to claim 1, It is characterized in that The refrigerant medium includes an inert gas.

6. The cooling system (100) according to claim 5, It is characterized in that The inert gas is carbon dioxide.

7. The cooling system (100) according to claim 1, It is characterized in that The second branch (102) is provided with a first expansion valve (7); and / or, A second expansion valve (8) is provided on the third branch (103).

8. A method for controlling a cooling system (100) according to any one of claims 1 to 7, It is characterized in that The control method of the cooling system (100) comprises the following steps: receiving a control instruction, and controlling the cooling system (100) to enter a corresponding working mode according to the control instruction, the working mode including a battery cooling mode, a refrigeration mode and a mixed mode; When the working mode is the battery cooling mode, the on-off control device controls the third branch (103) to be connected to the first branch (101), and the second branch (102) to be disconnected from the first branch (101); When the working mode is the cooling mode, the on-off control device controls the second branch (102) to be connected to the first branch (101), and the third branch (103) to be disconnected from the first branch (101); When the working mode is the mixed mode, the on-off control device controls the second branch (102) to be connected to the first branch (101), and the third branch (103) to be connected to the first branch (101).

9. The control method of the cooling system (100) according to claim 8, It is characterized in that The cooling system (100) is the cooling system (100) according to claim 4; The working mode also includes a fire extinguishing mode; After receiving a control instruction and controlling the cooling system (100) to enter a fire extinguishing mode according to the control instruction, the method further comprises: The on-off control device controls the third branch (103) to be connected with the first branch (101), the second branch (102) to be disconnected from the first branch (101), and controls the pressure relief electric control valve (44) to open to spray the refrigerant medium.

10. A car, It is characterized in that Comprising the cooling system (100) described in any one of claims 1-7.

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