Battery thermal management system, battery system and electric equipment

Abstract

The embodiment of the invention provides a battery thermal management system, a battery system and electric equipment, and relates to the technical field of thermal management systems. The battery heat management system comprises a heat exchange system and a part to be subjected to heat exchange, wherein the heat exchange system comprises a compressor and a first heat exchanger; the first heat exchanger comprises a first heat exchange pipeline and a second heat exchange pipeline which are relatively independent; the part to be subjected to heat exchange is used for exchanging heat with the battery; the part to be subjected to heat exchange comprises a first heat exchange part and a second heat exchange part; one end of the first heat exchange pipeline is connected to the compressor, and the other end of the first heat exchange pipeline is connected to a first heat exchange part of the part to be subjected to heat exchange; the two ends of the second heat exchange pipeline are connected with the second heat exchange part of the part to be subjected to heat exchange. According to the invention, the resource waste of the battery thermal management system can be reduced, so that the heat exchange cost of the battery thermal management system is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of thermal management systems, and in particular to a battery thermal management system, a battery system, and an electrical device. Background Art

[0002] With the increasing popularity of new energy vehicles, the requirements for the use of power batteries in new energy vehicles are becoming increasingly higher. Among them, temperature has a significant impact on battery performance, and the requirements for battery thermal management are becoming increasingly stringent.

[0003] The battery's positive and negative current collectors and connectors are typically located at each end. During high-rate charge and discharge, the battery can experience temperature unevenness, which in turn affects the battery's charging rate. In related technologies, a heat exchanger is typically used to exchange heat with the battery. This heat exchanger is typically connected to the heat exchange circuit of the battery's thermal management system, which then exchanges heat with the heat exchanger, thereby achieving heat exchange with the battery.

[0004] However, the design of the heat exchange circuit of the battery thermal management system is unreasonable, resulting in a waste of resources in the battery thermal management system and increasing the heat exchange cost of the battery thermal management system. Summary of the Invention

[0005] In view of the above problems, the embodiments of the present application provide a battery thermal management system, a battery system and an electrical device, which can prevent the waste of resources in the battery thermal management system and reduce the heat exchange cost of the battery thermal management system.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery thermal management system, comprising:

[0008] A heat exchange system, comprising a compressor and a first heat exchanger; wherein the first heat exchanger comprises a relatively independent first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline and the second heat exchange pipeline exchanging heat with each other;

[0009] The heat exchange component is used to exchange heat with the battery; wherein the heat exchange component includes a first heat exchange portion and a second heat exchange portion;

[0010] One end of the first heat exchange pipeline is connected to the compressor, and the other end of the first heat exchange pipeline is connected to the first heat exchange part of the heat exchange component; both ends of the second heat exchange pipeline are respectively connected to the second heat exchange part of the heat exchange component.

[0011] In a possible implementation, the first heat exchange portion is located at least on one side of the second heat exchange portion; or, the first heat exchange portion surrounds a portion of the outer circumference of the second heat exchange portion.

[0012] In a possible implementation, the second heat exchange portion and the second heat exchange pipeline form a second heat exchange circuit;

[0013] The second heat exchange circuit includes a first connecting pipeline connected between an outlet end and an inlet end of the second heat exchange pipeline.

[0014] In a possible implementation, the first connecting line is provided with a first solenoid valve, and the first solenoid valve is configured to control the first connecting line to be disconnected or to be connected.

[0015] In a possible implementation, the heat exchange system further includes a second solenoid valve connected between the outlet end of the first heat exchange pipeline and the second heat exchange part.

[0016] In a possible implementation, the heat exchange system further includes a first drive pump, which is disposed in the second heat exchange circuit;

[0017] And / or, the heat exchange system further includes a first expansion water tank, which is arranged in the second heat exchange circuit and is used to provide a circulating medium to the second heat exchange pipeline.

[0018] In a possible implementation, the heat exchange system further includes a first heating element connected between the second heat exchange portion and the second heat exchange pipeline.

[0019] In a possible implementation, the compressor and the first heat exchanger form a first heat exchange circuit; the heat exchange system further includes a condenser, which is connected to the first heat exchange circuit and located between the compressor and the first heat exchanger.

[0020] In a possible implementation, the heat exchange system further includes an evaporator, and the evaporator is connected to the first heat exchange circuit;

[0021] The first end of the evaporator is connected to the outlet end of the first heat exchange pipeline, and the second end of the evaporator is connected to the compressor;

[0022] Alternatively, a first end of the evaporator is connected to the condenser, and a second end of the evaporator is connected to the compressor.

[0023] In a possible implementation, the heat exchange system further includes a first heat exchange branch, the first heat exchange branch connecting the first heat exchange pipeline and the condenser, and a third solenoid valve is provided on the first heat exchange branch;

[0024] And / or, the heat exchange system further includes a second heat exchange branch, the second heat exchange branch connects the first end of the evaporator and the condenser, and a fourth solenoid valve is provided on the second heat exchange branch.

[0025] In a possible implementation, the heat exchange system further includes a first one-way valve connected between the outlet end of the first heat exchange pipeline and the first heat exchange part.

[0026] In a possible implementation, the circulating media in the first heat exchange pipeline and the circulating media in the second heat exchange pipeline are different.

[0027] In a possible implementation, the battery thermal management system further includes a third heat exchange circuit, which is connected to the component to be heat exchanged and heats a medium flowing through the component to be heat exchanged.

[0028] In a possible implementation, the third heat exchange circuit includes a relatively independent first sub-heat exchange circuit and a second sub-heat exchange circuit;

[0029] The two ends of the first sub-heat exchange circuit are respectively connected between the first end and the second end of the first heat exchange part;

[0030] Both ends of the second sub-heat exchange loop are respectively connected between the first end and the second end of the second heat exchange part.

[0031] In a possible implementation, the first sub-heat exchange circuit and the second sub-heat exchange circuit exchange heat with each other.

[0032] In a possible implementation, the heat exchange system further includes a second heat exchanger, and the compressor, the component to be heat exchanged, and the second heat exchanger form the third heat exchange loop.

[0033] In a possible implementation, the second heat exchanger includes a third heat exchange pipeline, one end of the third heat exchange pipeline is connected to the first heat exchange part, and the other end of the third heat exchange pipeline is connected to the compressor through a gas-liquid separator;

[0034] The third heat exchange pipeline, the compressor, the gas-liquid separator, and the first heat exchange portion of the heat-exchanged component form a first sub-heat exchange loop.

[0035] In a possible implementation, the second heat exchanger further includes a fourth heat exchange pipeline, which is connected to the second heat exchange portion and forms a second sub-heat exchange loop with the second heat exchange portion.

[0036] In a possible implementation, the fourth heat exchange pipeline and the third heat exchange pipeline exchange heat with each other.

[0037] In a possible implementation, the second sub-heat exchange circuit is provided with a second heating element.

[0038] In a possible implementation, the battery thermal management system further includes a fourth heat exchange branch, which is connected to the second sub-heat exchange loop and is connected in parallel with the fourth heat exchange pipeline.

[0039] In a possible implementation, the fourth heat exchange branch is provided with a second drive pump and a second expansion water tank, and the second expansion water tank is used to provide a circulating medium to the second heat exchange part.

[0040] In a possible implementation, the first heat exchanger is connected to the second sub-heat exchange loop.

[0041] In a possible implementation, a seventh solenoid valve is provided between the first end of the first heat exchange portion and the compressor.

[0042] In a possible implementation, the battery thermal management system further includes a controller; wherein the first heat exchange unit is used to exchange heat with a first area of ​​the battery, and the second heat exchange unit is used to exchange heat with a second area of ​​the battery;

[0043] The controller is used to control the working state of each heat exchange circuit according to the temperature difference between the first area and the second area.

[0044] In a possible implementation, if the temperature difference between the first region and the second region is within a first preset temperature difference range, the controller controls the first heat exchange loop and the second heat exchange loop to start, and controls the third heat exchange loop to shut down.

[0045] In a possible implementation, when the temperature of the second area is greater than a first preset temperature, the controller controls the first solenoid valve to close the first connecting pipeline.

[0046] In a possible implementation, when the temperature of the first region and the temperature of the second region are both lower than a second preset temperature, the controller controls the first heat exchange circuit to be closed and the third heat exchange circuit to be opened.

[0047] In a possible implementation, the controller is further configured to control the second heat exchange circuit to open.

[0048] A second aspect of the embodiments of the present application provides a battery, including a battery cell and the battery thermal management system described in the second aspect;

[0049] The heat-exchange component of the battery thermal management system exchanges heat with the battery cell.

[0050] A third aspect of an embodiment of the present application provides an electric device, comprising an electric device and the battery system described in the second aspect, wherein the battery cells of the battery system are connected to the electric device to provide electrical energy to the electric device.

[0051] The embodiments of the present application provide a battery thermal management system, a battery system, and an electrical device. By improving the heat exchange system, the heat exchange system includes a compressor and a first heat exchanger. The first heat exchanger includes a relatively independent first heat exchange pipeline and a second heat exchange pipeline. The first heat exchange pipeline and the second heat exchange pipeline exchange heat with each other. The second heat exchange pipeline can recover the waste heat of the first heat exchanger, and the waste heat is exchanged with the second area of ​​the battery through the second heat exchange part to increase the temperature of the second area. Correspondingly, the first heat exchange pipeline uses the heat of the heat exchange system to exchange heat with the first area of ​​the battery through the first heat exchange part to reduce the temperature of the first area. In this way, the heat of the heat exchange system can be used to exchange heat with different areas of the battery to reduce the temperature difference between different areas of the battery.

[0052] The mutual heat exchange between the first and second heat exchange pipes prevents the first heat exchanger from exchanging heat with the environment, eliminating resource waste and improving the energy efficiency of the battery thermal management system. Furthermore, the use of the first heat exchanger replaces the head condenser and heat exchanger in related technologies, simplifying the battery thermal management system's component count and reducing the heat exchange cost.

[0053] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery thermal management system, battery system and electrical equipment provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0055] Figure 1 Schematic diagram of the structure of the battery thermal management system provided in the embodiment of the present application Figure 1 ;

[0056] Figure 2 Schematic diagram of the structure of the battery thermal management system provided in the embodiment of the present application Figure 2 .

[0057] Description of reference numerals:

[0058] 1000: Battery thermal management system;

[0059] 100: heat exchange system; 110: compressor; 120: condenser; 130: first heat exchanger; 131: first heat exchange pipeline; 132: second heat exchange pipeline; 140: first heating element; 150: evaporator; 160: second heat exchanger; 161: third heat exchange pipeline; 162: fourth heat exchange pipeline; 170: second heating element; 190: gas-liquid separator;

[0060] 11: First temperature sensor; 12: First connecting pipeline; 13: First solenoid valve; 14: Second solenoid valve; 15: First drive pump; 16: First expansion water tank; 17: First one-way valve; 18: Second temperature sensor; 19: First heat exchange branch; 20: Second heat exchange branch; 21: Third solenoid valve; 22: Fourth solenoid valve; 24: Fifth solenoid valve; 25: Sixth solenoid valve; 26: Second drive pump; 27: Second expansion water tank; 28: Seventh solenoid valve; 29: Fourth heat exchange branch; 30: Second connecting pipeline;

[0061] 200: heat exchange component; 210: first heat exchange part; 220: second heat exchange part;

[0062] 300: Battery cell.

[0063] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0064] The battery generates heat during the rapid charging and discharging process, and the amount of heat will affect the battery's charging and discharging rate. Due to the location of the battery's poles and other parts, generally, when the battery cell is fast charged, the battery temperature at the pole position also rises rapidly, but the temperature at other parts of the battery cell does not keep up, and the rate of increase is much slower than that at the pole position. The charging strategy is to match the corresponding charging current according to the battery's lowest temperature. If the temperature at other parts of the battery cell does not rise for a long time, even if the temperature at the pole position rises very high, the battery's charging current cannot be effectively increased, and the purpose of fast charging cannot be achieved. In this fast charging situation, what needs to be considered is how to lower the temperature of the pole while increasing the temperature at other parts of the battery cell to achieve uniform temperature of the battery cell.

[0065] Therefore, related technologies utilize the first heat exchange circuit of a battery thermal management system to exchange heat with the battery to ensure temperature balance. However, current battery thermal management systems typically include a compressor, a first condenser, a second condenser, and a first heat exchanger. These components form the first heat exchange circuit; the first condenser serves as the passenger compartment condenser, and the second condenser serves as the front condenser, exchanging heat with the engine. The component to be heat exchanged is connected to the first heat exchange circuit; the component to be heat exchanged includes a first heat exchange portion and a second heat exchange portion. The first heat exchange portion is used to exchange heat with the second area of ​​the battery, and the second heat exchange portion is used to exchange heat with the first area of ​​the battery.

[0066] When the first heat exchange loop is in the battery cooling and air conditioning mode, the compressor is used to form a high-temperature and high-pressure gas. After the high-temperature and high-pressure gas flows through the first condenser and the second condenser, it forms a medium-temperature and high-pressure liquid. Afterwards, this medium-temperature and high-pressure liquid is throttled by the electronic expansion valve and divided into at least two paths: the first path enters the first heat exchanger to heat the coolant of the first heat exchanger. Afterwards, the coolant after heat exchange flows through the first heat exchange part of the heat exchange component to heat the second area of ​​the battery; the second path flows directly through the second heat exchange part to quickly cool and exchange heat on the first area of ​​the battery to ensure the temperature balance of the battery.

[0067] It can be seen from this that when the medium-temperature and high-pressure liquid flows through the second condenser, it will directly diffuse heat into the environment, resulting in a waste of resources; in addition, the current battery thermal management system includes a second condenser and a first heat exchanger, which has the defects of complex structure and high heat exchange cost.

[0068] In response to the above technical problems, the embodiments of the present application provide a battery thermal management system, a battery system, and an electrical device. By improving the heat exchange system, the heat exchange system includes a compressor and a first heat exchanger. The first heat exchanger includes a relatively independent first heat exchange pipeline and a second heat exchange pipeline. There is mutual heat exchange between the first heat exchange pipeline and the second heat exchange pipeline. The second heat exchange pipeline can recover the waste heat of the first heat exchanger, and the waste heat is exchanged with the second area of ​​the battery through the second heat exchange part to increase the temperature of the second area; accordingly, the first heat exchange pipeline uses the heat of the heat exchange system to exchange heat with the first area of ​​the battery through the first heat exchange part to reduce the temperature of the first area. In this way, the heat of the heat exchange system can be used to exchange heat with different areas of the battery to reduce the temperature difference between different areas of the battery.

[0069] The mutual heat exchange between the first and second heat exchange pipes prevents the first heat exchanger from exchanging heat with the environment, eliminating resource waste and improving the energy efficiency of the battery thermal management system. Furthermore, the use of the first heat exchanger replaces the head condenser and heat exchanger in related technologies, simplifying the battery thermal management system's component count and reducing the heat exchange cost.

[0070] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0071] The present invention provides a battery thermal management system for thermally managing a battery so as to maintain the battery's operating temperature within a target range. The battery thermal management system can be applied to an electrical device, such as a vehicle.

[0072] The battery thermal management system 1000 includes a heat exchange system 100, which can be an air conditioning system or other cooling system in the battery thermal management system 1000. The heat exchange system 100 includes a compressor 110, which compresses the circulating medium to convert the circulating medium from a low-temperature, low-pressure gas to a high-temperature, high-pressure gas.

[0073] The heat exchange system 100 further includes a first heat exchanger 130. The compressor 110 and the first heat exchanger 130 are used to form a first heat exchange loop to form a closed-loop cooling / heating cycle system to regulate the temperature of the electrical equipment. The flow direction of the circulating medium in the first heat exchange loop can be understood as the flow direction of the circulating medium in the first heat exchange loop. Figure 1 In the direction of arrow a.

[0074] It should be noted that, in this embodiment, the heat exchange system 100 further includes a condenser 120, which is connected to the first heat exchange circuit and located between the compressor 110 and the first heat exchanger 130. The condenser 120 is capable of exchanging heat with the external environment, cooling and liquefying the circulating medium, converting it from a high-temperature, high-pressure gas to a medium-temperature, high-pressure liquid.

[0075] In this embodiment, the first heat exchanger 130 is a plate heat exchanger. For example, the first heat exchanger 130 includes a first heat exchange pipeline 131 and a second heat exchange pipeline 132, which are independent of each other. It should be understood that in this embodiment, the flow directions of the media flowing through the first heat exchange pipeline 131 and the second heat exchange pipeline 132 are independent and do not interfere with each other. Therefore, the first heat exchange pipeline 131 and the second heat exchange pipeline 132 can be considered independent of each other.

[0076] The battery thermal management system 1000 also includes a heat exchange component 200, which includes a first heat exchange portion 210 and a second heat exchange portion 220. The first heat exchange portion 210 and the second heat exchange portion 220 are used to exchange heat with different areas of the battery. For example, the battery includes a first area and a second area with different heat generation, the heat generation of the first area is greater than the heat generation of the second area, and the first area is at least arranged on one side of the second area. It should be noted that in this embodiment, the first area can be an area opposite to the battery pack's poles, and this area has a higher heat generation. When the battery's poles are arranged at both ends of the battery, the two ends of the battery in the first direction are the first area. The second area can be other areas of the battery pack excluding the areas opposite to the poles, and this area has a lower heat generation. When the battery's poles are arranged at both ends of the battery, the middle part of the battery in the first direction is usually the second area of ​​the battery.

[0077] The first heat exchange unit 210 is used to exchange heat with the first area of ​​the battery, and the second heat exchange unit 220 is used to exchange heat with the second area of ​​the battery. In this embodiment, the first heat exchange unit 210 and the second heat exchange unit 220 are relatively independent. This allows the heat exchange performance of the first heat exchange unit 210 and the second heat exchange unit 220 to be adjusted independently, thereby facilitating the control of different battery temperatures. It should be noted that in this embodiment, heat exchange can be understood as cooling or heating the battery. The specific temperature can be determined based on the temperature of the battery itself and the temperature of the medium flowing through the heat exchange element 200.

[0078] In the embodiment of the present application, the first heat exchange portion 210 is located at least on one side of the second heat exchange portion 220 ; or, the first heat exchange portion 210 surrounds a portion of the outer circumference of the second heat exchange portion 220 .

[0079] In other words, in one example, the first heat exchange portion 210 may be located on one side of the second heat exchange portion 220 to Figure 1 Taking the orientation shown as an example, the first heat exchange portion 210 can be located on the left or right side of the second heat exchange portion 220. In another example, the first heat exchange portion 210 can be located on both sides of the second heat exchange portion 220. In yet another example, the first heat exchange portion 210 surrounds a portion of the outer circumference of the second heat exchange portion 220, that is, the first heat exchange portion 210 has a U-shaped structure, and the second heat exchange portion 220 is located within the U-shaped inner cavity of the first heat exchange portion 210.

[0080] In this way, the positions of the first heat exchange portion 210 and the second heat exchange portion 220 can be freely set according to the battery structure, thereby improving the design flexibility of the battery thermal management system 1000.

[0081] In this embodiment, the heat exchange element 200 includes a flow channel plate and a temperature averaging plate. The flow channel plate is formed with a heat exchange channel, which can be formed by a stamping process. The temperature averaging plate cover is disposed on the flow channel plate to form a closed heat exchange channel between the flow channel plate and the temperature averaging plate.

[0082] The heat exchange channel includes a first heat exchange channel and a second heat exchange channel. The second heat exchange channel is arranged in the middle area of ​​the channel plate, forming the second heat exchange portion. The first heat exchange channel is arranged in the edge area of ​​the channel plate and surrounds the second heat exchange channel. For example, the first heat exchange channel has a U-shaped structure, and the second heat exchange channel is arranged in the area enclosed by the first heat exchange channel. The first heat exchange channel constitutes the first heat exchange portion 210.

[0083] The first heat exchange portion 210 is connected to the first heat exchange circuit at both ends via joints. It should be noted that the diameter of the first heat exchange channel and the diameter of the second heat exchange channel can be the same or different. In one example, the diameter of the first heat exchange channel is smaller than the diameter of the second heat exchange channel.

[0084] One end of the first heat exchange pipeline 131 is connected to the compressor 110 , and the other end of the first heat exchange pipeline 131 is connected to the first heat exchange part 210 of the heat exchange component 200 ; both ends of the second heat exchange pipeline 132 are respectively connected to the second heat exchange part 220 of the heat exchange component 200 .

[0085] During the battery's charge and discharge process, the first region of the battery generates more heat, while the second region generates less heat. This causes an imbalance in the temperatures of the second and first regions, which in turn affects the battery's charge and discharge rates. To facilitate the description of the battery's operating state and its matching with the battery thermal management system, this state is referred to as the first state. Therefore, when the battery is in the first state, different heat exchange strategies are required for different regions of the battery to achieve temperature balance across the different regions.

[0086] Please refer to the attached Figure 1 When the battery is in the first state, the first end of the first heat exchange part 210 is connected to the first heat exchange pipeline 131, and the second end of the first heat exchange part 210 is connected to the compressor 110, so that the compressor 110, the condenser 120 and the first heat exchange part 210 form a closed-loop cooling mode; at this time, the first heat exchange part 210 can absorb the heat generated by the first area of ​​the battery, so that the circulating medium flowing through the first heat exchange part 210 is converted into a low-temperature and low-pressure gas, and then flows back to the compressor 110 to perform the compression cycle again. At the same time, the first heat exchange part 210 cools the first area of ​​the battery.

[0087] The second heat exchange portion 220 is connected to the second heat exchange pipeline 132 , so that the second heat exchange portion 220 and the second heat exchange pipeline 132 form a second heat exchange loop, so as to facilitate heat exchange between the second heat exchange portion 220 and the second heat exchange pipeline 132 .

[0088] In the embodiment of the present application, the flow direction of the circulating medium in the second heat exchange circuit can be understood as the attached Figure 1 Direction of arrow b. The high-temperature, high-pressure gaseous medium generated by compressor 110, after undergoing heat exchange in first heat exchanger 130, is connected to first heat exchange unit 210 via first heat exchange pipe 131 for heat exchange. Furthermore, the medium in second heat exchange pipe 132, after exchanging heat with first heat exchange pipe 131, is directly connected to second heat exchange unit 220 for heat exchange. During this process, first heat exchanger 130 does not exchange heat with the environment, eliminating resource waste and improving the energy efficiency of the battery thermal management system. Furthermore, the use of first heat exchanger 130 replaces the head condenser and heat exchanger used in related art, simplifying the number of components in the battery thermal management system and reducing the heat exchange cost of the battery thermal management system.

[0089] It should be noted that the media flowing through the first heat exchange pipeline 131 and the second heat exchange pipeline 132 of the first heat exchanger 130 may be the same or different.

[0090] Exemplarily, the first heat exchange line 131 and the second heat exchange line 132 flow through different media, and heat exchange occurs between the first heat exchange line 131 and the second heat exchange line 132. For example, the first heat exchange line 131 flows through a refrigerant, so that the refrigerant in the first heat exchange circuit flows through the first heat exchange line 131 before exchanging heat with the first region of the battery. The second heat exchange line 132 flows through a heat exchange medium, such as a refrigerant, CO2, ethylene glycol, or water. Heat exchange occurs between the second heat exchange line 132 and the first heat exchange line 131.

[0091] When the battery is in the first state, the compressor 110 compresses the refrigerant, so that the refrigerant is converted from a low-temperature and low-pressure gas to a high-temperature and high-pressure gas; the high-temperature and high-pressure gaseous refrigerant is transmitted to the first heat exchange pipeline 131 of the first heat exchanger 130 via the condenser 120 and is converted into a medium-temperature and high-pressure liquid. At this time, the medium-temperature and high-pressure liquid exchanges heat with the heat exchange medium in the second heat exchange pipeline 132, reducing the temperature of the refrigerant in the first heat exchange pipeline 131, so that the refrigerant in the first heat exchange pipeline 131 is converted into a low-temperature and low-pressure liquid. The low-temperature and low-pressure liquid is throttled by the first one-way valve 17 and flows through the first heat exchange part 210 of the heat exchange component 200. After exchanging heat with the first area of ​​the first battery, it absorbs the heat of the first area of ​​the battery, so that the refrigerant is converted from a low-temperature and low-pressure liquid to a low-temperature and low-pressure gas, and returns to the compressor 110, forming a new round of compression and heat exchange.

[0092] At the same time, heat exchange occurs between the second heat exchange pipeline 132 and the first heat exchange pipeline 131, increasing the temperature of the heat exchange medium in the second heat exchange pipeline 132. When the heat exchange medium in the second heat exchange pipeline 132 flows through the second heat exchange part 220, it can release heat to heat the second area of ​​the battery.

[0093] This arrangement ensures temperature balance across the battery's various zones, improving the battery's charge and discharge rates. Furthermore, heat exchange between the refrigerant and the heat exchange medium occurs within the first heat exchanger 130, eliminating the need for heat exchange with the surrounding environment. This eliminates resource waste and improves the energy efficiency of the battery thermal management system.

[0094] The following embodiments all take the circulating medium in the first heat exchange pipeline 131 as a refrigerant and the circulating medium in the second heat exchange pipeline 132 as a heat exchange medium as an example to describe the working process of the battery thermal management system in detail.

[0095] It should be noted that the heating of the heat exchange medium in the second heat exchange circuit may rely solely on the refrigerant in the first heat exchange circuit or may rely on other methods.

[0096] For example, the heat exchange system 100 includes a first heating element 140 connected to the second heat exchange circuit for heating the heat exchange medium in the second heat exchange pipeline 132, thereby facilitating heating of the second region of the battery by the second heat exchange unit 220. The first heating element 140 may be a resistive heating element or an electromagnetic heating element.

[0097] In the embodiment of the present application, the operating state of the first heating element 140 can be set according to the temperature of the heat exchange medium in the second heat exchange circuit. For example, a first temperature sensor 11 is provided at a position near the outlet end of the second heat exchange pipe 132 in the second heat exchange circuit. The first temperature sensor 11 is connected to the control system of the battery thermal management system. The first temperature sensor 11 is used to detect the real-time temperature of the heat exchange medium in the second heat exchange circuit and transmit the detection signal to the control system of the battery thermal management system. The control system determines the relationship between the detection temperature of the first temperature sensor 11 and the preset temperature based on the detection signal, and then controls the operating state of the first heating element 140. If the detection temperature of the first temperature sensor 11 is greater than the preset temperature, the first heating element 140 is in a non-heating state; if the detection temperature of the first temperature sensor 11 is less than the preset temperature, the first heating element 140 is in a heating state.

[0098] In this embodiment, the first heating element 140 cooperates with the refrigerant in the first heat exchange circuit. Acting as an additional heating source, the first heating element 140 can compensate for any potential heat shortages in the refrigerant in the first heat exchange circuit, ensuring that the heat exchange medium in the second heat exchange circuit remains within an appropriate temperature range. This effectively improves the heating efficiency of battery thermal management. Furthermore, the operating state of the first heating element 140 can be flexibly adjusted based on actual needs, enhancing the system's adaptability and flexibility.

[0099] Furthermore, under appropriate conditions, the first heating element 140 can work in conjunction with the refrigerant in the first heat exchange circuit to reduce reliance on external energy sources and help lower energy consumption. In particular, in certain situations, when the refrigerant in the first heat exchange circuit itself can provide sufficient heat, the first heating element 140 can be turned off, thereby achieving the advantages of rational energy utilization and energy conservation and emission reduction.

[0100] It should be noted that whether the second heat exchange circuit is activated or not needs to be determined based on the ambient temperature and the temperature of the battery itself. If the battery is in a high temperature environment (40 to 50 degrees), the temperature of the second area of ​​the battery has become very high, and the second area of ​​the battery does not need to be heated again, and the second heat exchange circuit is in a stopped state; if the battery temperature is below 40 degrees, the second heat exchange circuit is in an activated state.

[0101] Therefore, in order to achieve the above-mentioned technical effects, the second heat exchange circuit disclosed in the embodiment of the present application also includes a first connecting pipe 12, which is connected to the outlet and inlet ends of the second heat exchange pipe 132, so that the first connecting pipe 12 and the second heat exchange pipe 132 are arranged in parallel.

[0102] In the first state, the first connecting pipe 12 is disconnected or connected. For example, in the initial startup phase or a short startup time in the first state, the temperature of the second region of the battery is still below 40 degrees Celsius. In this case, the first connecting pipe 12 is disconnected, and accordingly, the second heat exchange circuit is in the connected state. The first heating element 140 and / or the refrigerant in the first heat exchange circuit can be used to heat the second region of the battery, thereby making the temperature of the second region and the first region of the battery more balanced, thereby improving the battery's charge and discharge rate.

[0103] As the startup time of the first state gradually increases, the temperature of the second area of ​​the battery will be higher than 40 degrees. At this time, the first connecting pipe 12 is opened, so that the heat exchange medium in the second heat exchange pipe 132 flows through the first connecting pipe 12 via the outlet end of the second heat exchange pipe 132 and flows back to the inlet end of the second heat exchange pipe 132, so that the heat exchange medium circulates in the second heat exchange pipe 132 and the first connecting pipe 12, avoiding excessive increase in the temperature of the second area of ​​the battery.

[0104] In order to facilitate timely control of the conduction or disconnection of the first connecting pipeline 12, the heat exchange system 100 disclosed in the embodiment of the present application also includes a first solenoid valve 13, which is arranged in the first connecting pipeline 12, and the first solenoid valve 13 is connected to the control system of the battery thermal management system. The control system can control the first solenoid valve 13 to open or close according to the temperature of the second area of ​​the battery, thereby achieving the control of the conduction or disconnection of the first connecting pipeline 12.

[0105] In addition, the heat exchange system 100 also includes a second solenoid valve 14, which is connected between the outlet end of the first heat exchange pipeline 131 and the second heat exchange unit 220. For example, the second solenoid valve 14 is used to control whether heat exchange occurs between the first heat exchanger 130 and the heat exchange component 200. In this way, the second solenoid valve 14 cooperates with the first solenoid valve 13 to improve the accuracy of the battery thermal management system.

[0106] In actual operation, if the battery temperature is lower than 40 degrees, the first solenoid valve 13 is closed and the second solenoid valve 14 is opened. If the battery temperature is lower than 40 degrees, the first solenoid valve 13 is opened and the second solenoid valve 14 is closed.

[0107] In order to accurately control the working status of the first heating element 140, the first solenoid valve 13 and the second solenoid valve 14, the heat exchange system provided in the embodiment of the present application also includes a second temperature sensor 18, which is arranged between the inlet end of the second heat exchange pipeline 132 and the second heat exchange part 220.

[0108] In one possible implementation, the heat exchange system 100 further includes a first drive pump 15 disposed in the second heat exchange loop. As a power source, the first drive pump 15 ensures continuous and stable circulation of the heat exchange medium in the second heat exchange loop, thereby improving the heat exchange efficiency of the heat exchange system 100.

[0109] Alternatively, the heat exchange system 100 may further include a first expansion water tank 16, which is disposed within the second heat exchange circuit and is used to supply circulating medium to the second heat exchange pipeline 132. The provision of the first expansion water tank 16 helps maintain a stable volume of the heat exchange medium within the second heat exchange circuit. During the heat exchange process, the heat exchange medium may expand or contract due to temperature fluctuations. The first expansion water tank 16 can absorb or compensate for these volume changes, preventing adverse effects on the system caused by medium volume fluctuations, thereby enhancing system stability and reliability.

[0110] It should be noted that the second heat exchange line 132 and the second heat exchange unit 220 are connected via a second connecting line 30. The second connecting line 30, the second heat exchange line 132, and the second heat exchange unit 220 form a second heat exchange circuit. The first heating element 140, the second solenoid valve 14, the first drive pump 15, and the first expansion tank 16 are disposed on the second connecting line 30.

[0111] In this embodiment of the present application, the heat exchange system 100 further includes a first one-way valve 17, which is disposed between the outlet of the first heat exchange line 131 and the first heat exchange unit 210. The first one-way valve 17 only allows the refrigerant to flow from the first heat exchange line 131 to the first heat exchange unit 210 and does not allow backflow. The first one-way valve 17 also has a throttling function, which can reduce the temperature of the refrigerant in the first heat exchange line 131, thereby facilitating cooling of the first heat exchange unit 210 and the first area of ​​the battery.

[0112] In one possible implementation, the first heat exchanger 130 is also connected in parallel to the liquid cooling circuit of the electric motor of the electrical equipment. In the first state, the first heat exchanger 130 is used to exchange heat with the liquid cooling circuit of the electric motor. This fully utilizes the resources of the battery thermal management system and reduces the heat exchange cost of the battery thermal management system.

[0113] In one possible implementation, the heat exchange system 100 further includes an evaporator 150, which is connected to the first heat exchange circuit. A first end of the evaporator 150 is selectively connected to the outlet of the first heat exchange line 131 or to the condenser 120; a second end of the evaporator 150 is connected to the compressor 110. It should be noted that the term "selectively" in this embodiment means that, under different conditions, the first end of the evaporator 150 can selectively be connected to either the outlet of the first heat exchange line 131 or the condenser 120.

[0114] Evaporator 150 is a key component in heat exchange system 100 responsible for refrigerant phase transitions. As liquid refrigerant flows through the evaporator, it absorbs heat from the surrounding environment and undergoes a phase change, transforming from liquid to gas. This process absorbs a significant amount of heat, lowering the temperature of the environment surrounding evaporator 150.

[0115] In one example, the first end of the evaporator 150 is connected to the outlet of the first heat exchange line 131, and the second end of the evaporator 150 is connected to the compressor 110. At this point, the battery is in the first state, and the medium flowing through the first heat exchange line 131 is split into two paths. One path enters the first heat exchange section 210 through the seventh solenoid valve 28, releasing heat to heat the first area of ​​the battery. The other path passes through the evaporator 150, where it absorbs heat from the passenger compartment and cools the passenger compartment. The other path flows through the first heat exchange section 210 of the heat exchange component 200 to heat the first heat exchange area of ​​the battery.

[0116] It should be noted that when the battery does not need cooling but the passenger compartment does, the first end of the evaporator 150 is connected to the condenser 120, and the second end of the evaporator 150 is connected to the compressor 110. This allows the refrigerant to bypass the first heat exchanger 130 and flow directly through the evaporator 150 and back to the compressor 110.

[0117] To facilitate precise control of the refrigerant flow direction, the first heat exchange circuit provided in the embodiment of the present application includes a first heat exchange branch 19, which connects the first heat exchange pipeline 131 and the condenser 120, and is provided with a third solenoid valve 21. Alternatively, the first heat exchange circuit includes a second heat exchange branch 20, which connects the first heat exchange pipeline 131 and the condenser 120, and connects the first end of the evaporator 150 and the condenser 120. A fourth solenoid valve 22 is provided on the second heat exchange branch 20.

[0118] When the first heat exchange branch 19 is turned on and the second heat exchange branch 20 is turned off, the circulating medium flowing out through the first one-way valve 17 flows through the evaporator to cool the passenger compartment in one path, and flows through the first heat exchange part 210 of the heat exchange component 200 to cool the first area of ​​the battery in the other path.

[0119] When the first heat exchange branch 19 is disconnected and the second heat exchange branch 20 is opened, the circulating medium in the compressor 110 flows through the evaporator 150 only through the second heat exchange branch 20. At this time, the heat exchange system 100 only cools the passenger compartment.

[0120] In this embodiment, the third solenoid valve 21 is used to flexibly control the conduction or disconnection of the first heat exchange branch 19 , and the fourth solenoid valve 22 is used to flexibly control the conduction or disconnection of the second heat exchange branch 20 .

[0121] It should be noted that the connection method of each component in the first heat exchange circuit needs to be connected according to the state of the battery. For example, when the battery is in a relatively cold environment, both the first area and the second area need to be heated, and the battery state can be recorded as the second state.

[0122] Accordingly, please refer to the attached Figure 2 The battery thermal management system 1000 provided in this embodiment further includes a third heat exchange circuit, which is connected to the heat exchange element 200 and heats the medium flowing through the heat exchange element 200. This ensures the normal operation of the battery in a low-temperature environment.

[0123] Exemplarily, the third heat exchange circuit includes a relatively independent first sub-heat exchange circuit and a second sub-heat exchange circuit; the two ends of the first sub-heat exchange circuit are respectively connected to the first end and the second end of the first heat exchange part 210; the first sub-heat exchange circuit heats the circulating medium in the first heat exchange part 210, and then heats the first area of ​​the battery.

[0124] The two ends of the second sub-heat exchange loop are respectively connected between the first end and the second end of the second heat exchange part 220. The second sub-heat exchange loop heats the medium flowing in the second heat exchange part 220, thereby heating the second area of ​​the battery.

[0125] In this way, the first sub-heat exchange loop and the second sub-heat exchange loop heat the first area and the second area of ​​the battery respectively. This zoned heating method makes thermal management more precise. At the same time, by flexibly adjusting the working status of each sub-heat exchange loop, the battery thermal management system can be adaptively adjusted according to different battery requirements and environmental conditions, thereby improving the flexibility of the battery thermal management system. Given that the refrigerant in the first sub-heat exchange loop eventually needs to return to the compressor 110, in order to reduce damage to the compressor 110, the first sub-heat exchange loop and the second sub-heat exchange loop exchange heat with each other. In this way, the first sub-heat exchange loop can absorb the heat in the second sub-heat exchange loop and heat the refrigerant flowing through it, so that the refrigerant forms a low-temperature, low-pressure gas.

[0126] Please refer to the attached Figure 1 The second sub-heat exchange circuit can be composed of a second heat exchange pipeline 132, a first heating element 140, and a second connecting pipeline 30. When the battery is in a low-temperature environment, the high-temperature and high-pressure refrigerant compressed by the compressor 110 enters the heat exchange element 200 through the first end of the first heat exchange unit 210. It releases latent heat and a portion of sensible heat through condensation phase change, rapidly heating the areas with higher cooling loads at both ends of the battery. The refrigerant then flows back to the compressor 110.

[0127] At this time, the first heating element 140 can start to work and heat the circulating medium flowing through the second heat exchange part 220, thereby heating the middle area of ​​the battery to reduce the temperature difference between different areas of the battery.

[0128] It should be noted that the second sub-heat exchange circuit is not limited to the above structure. Figure 2Heat exchange system 100 further includes a second heat exchanger 160. Compressor 110, heat exchange element 200, and second heat exchanger 160 form a third heat exchange loop. Thus, second heat exchanger 160 can be used to convert the refrigerant into a state suitable for re-entering compressor 110. This not only ensures smooth circulation of the refrigerant within the system but also avoids problems such as damage to compressor 110 or reduced efficiency caused by improper refrigerant state.

[0129] To form two sub-heat exchange loops, the number of second heat exchangers 160 can be one or two. Exemplarily, the second heat exchanger 160 includes a third heat exchange pipeline 161 , one end of which is connected to the first heat exchange unit 210 , and the other end of the third heat exchange pipeline 161 is connected to the compressor 110 via the gas-liquid separator 190 .

[0130] The third heat exchange pipeline 161 , the compressor 110 , the gas-liquid separator 190 and the first heat exchange portion 210 of the heat-exchanged element 200 form a first sub-heat exchange loop.

[0131] In the actual heat exchange process, the flow direction of the circulating medium in the first sub-heat exchange circuit is as shown in the following figure. Figure 2 In the direction of arrow c; the high-temperature and high-pressure refrigerant compressed by the compressor 110 enters the heat-exchange component 200 through the first end of the first heat exchange part 210, releases latent heat and a part of sensible heat through condensation phase change, and quickly heats the areas with higher cold loads at both ends of the battery cell to quickly reach the temperature range of high-rate charging.

[0132] Afterwards, when the circulating medium passing through the heat-exchange component 200 passes through the third heat exchange pipeline 161 of the second heat exchanger 160, it can absorb the heat of the environment or the motor and be converted into a low-temperature, low-pressure gas. Afterwards, the low-temperature, low-pressure gaseous circulating medium is separated in the gas-liquid separator 190 and flows back to the compressor 110.

[0133] The second heat exchanger 160 further includes a fourth heat exchange pipe 162, which is connected to the second heat exchange portion 220 and forms a second sub-heat exchange loop with the second heat exchange portion 220. The flow direction of the circulating medium in the second sub-heat exchange loop is as shown in the attached figure. Figure 2 The direction of arrow d.

[0134] It should be noted that the heat of the medium flowing through the fourth heat exchange pipeline 162 may come from the second heat exchanger 160 itself or from other sources.

[0135] For example, the second heat exchanger 160 can be a heat exchanger for the motor of an electrical equipment. The motor will generate a large amount of heat during operation. Therefore, the temperature of the circulating medium in the fourth heat exchange pipeline 162 of the second heat exchanger 160 is relatively high. The high-temperature circulating medium is connected to the second heat exchange part 220 via the fourth heat exchange pipeline 162, and forms a second sub-heat exchange loop with the second heat exchange part 220. In this way, the latent heat and part of the sensible heat are released through the condensation phase change, and the area with low cooling load in the middle of the battery cell is quickly heated and heated.

[0136] In this embodiment, the fourth heat exchange pipeline 162 exchanges heat with the third heat exchange pipeline 161. The medium flowing through the third heat exchange pipeline 161 can also fully utilize the heat generated by the motor. This heat is absorbed by the medium and converted into a gaseous state, thereby achieving energy recovery and reuse. This not only improves the overall energy efficiency of the system, but also increases resource utilization and reduces energy waste.

[0137] In addition, by connecting the fourth heat exchange pipe 162 to the second heat exchange part 220, the heat of the motor can be discharged more effectively, thereby improving the cooling effect of the motor, which in turn helps to extend the service life of the motor and improve the operating stability and reliability of the motor.

[0138] It should be understood that the heat in the second heat exchange sub-circuit can come from other sources. For example, the second heat exchange sub-circuit is provided with a second heating element 170. When the second heating element 170 is in operation, the second heating element 170 heats the heat exchange medium in the second heat exchange sub-circuit, thereby enabling the second heat exchange sub-circuit to heat the circulating medium in the second heat exchange portion 220, thereby heating the second region of the battery.

[0139] At the same time, the second heating element 170 heats the heat exchange medium in the fourth heat exchange pipeline 162. In this way, the high-temperature heat exchange medium in the fourth heat exchange pipeline 162 exchanges heat with the low-temperature circulating medium in the third heat exchange pipeline 161, so that the circulating medium passing through the heat exchange element 200 and the condenser 120 is heated, so that the circulating medium is converted into a low-temperature and low-pressure gas, and then enters the compressor 110.

[0140] It should be noted that the heat of the medium flowing through the second heat exchange portion 220 can also be derived from the first heating element 140. For example, the first heat exchanger 130 is connected to the second sub-heat exchange loop. In other words, the second heat exchange line 132 of the first heat exchanger 130 is connected to the second sub-heat exchange loop. In this case, the first heating element 140 can be used to heat the heat exchange medium in the second sub-heat exchange loop.

[0141] In this way, the first heating element 140 and the second heating element 170 can be used in conjunction with each other to provide multiple heat source options for the second heat exchange sub-circuit, such as the second heating element 170 and the first heating element 140. This increases the flexibility of the system's heat supply, allowing the battery thermal management system to adjust the heat source according to actual needs to adapt to different operating environments and conditions.

[0142] In one possible implementation, the battery thermal management system further includes a fourth heat exchange branch 29 , which is connected to the second sub-heat exchange loop and is connected in parallel with the fourth heat exchange pipeline 162 .

[0143] The fourth heat exchange branch 29 is provided with a second drive pump 26 and a second expansion water tank 27. The second expansion water tank 27 is used to provide circulating medium to the second heat exchanger 160. The second drive pump 26, as a power source, can ensure the continuous and stable circulation of the heat exchange medium in the fourth heat exchange branch 29, thereby improving the heat exchange efficiency of the heat exchange system 100.

[0144] The provision of the second expansion water tank 27 helps maintain a stable volume of the heat exchange medium in the fourth heat exchange branch 29. During the heat exchange process, the heat exchange medium may expand or contract due to temperature fluctuations. The second expansion water tank 27 can absorb or compensate for these volume changes, preventing adverse effects on the system caused by medium volume fluctuations, thereby enhancing system stability and reliability.

[0145] In this embodiment of the present application, the fourth heat exchange branch 29 can provide circulating medium not only for the second heat exchanger 160, but also for the first heat exchanger 130. For example, the first heat exchanger 130 is connected to the fourth heat exchange branch 29. This allows the first heat exchanger 130 to be connected not only to the second heat exchange circuit but also to the fourth heat exchange branch 29. This allows the first heat exchanger 130 to select different expansion tanks as a medium source as needed, greatly increasing the flexibility and adaptability of the entire system. Under different operating conditions or requirements, the system can optimize and select the optimal medium source to achieve a more efficient and stable heat exchange process.

[0146] In one possible implementation, a seventh solenoid valve 28 is provided between the first end of the first heat exchange portion 210 and the compressor 110. The seventh solenoid valve 28 is used to control the on / off of the first sub-heat exchange loop.

[0147] The third heat exchange circuit includes a fifth solenoid valve 24 and a sixth solenoid valve 25, which are arranged on the first sub-heat exchange circuit. Specifically, the fifth solenoid valve 24 and the sixth solenoid valve 25 are arranged in the first sub-heat exchange circuit between the outlet of the compressor 110 and the inlet of the first heat exchange section 210. When the battery is in the second state, the fifth solenoid valve 24, the sixth solenoid valve 25, the fourth solenoid valve 22, and the seventh solenoid valve 28 are opened, and the third solenoid valve 21 is closed. At this time, the high-temperature, high-pressure gaseous refrigerant generated by the compressor 110 enters the condenser 120 to heat the passenger compartment; the other path enters the first heat exchange section 210 through the first sub-heat exchange circuit 23 to heat the first region of the battery.

[0148] In another possible embodiment, the battery thermal management system further includes a controller; wherein the first heat exchange part 210 is used to exchange heat with a first area of ​​the battery, and the second heat exchange part 220 is used to exchange heat with a second area of ​​the battery.

[0149] The controller is used to control the working state of each heat exchange circuit according to the temperature difference between the first area and the second area.

[0150] For example, if the temperature difference between the first and second regions falls within a first preset temperature difference range, the controller activates the first and second heat exchange circuits and deactivates the third heat exchange circuit. At this point, the first and second regions of the battery can be heated. The temperature difference between the first and second regions can be understood as the absolute difference between the temperatures of the first and second regions. Typically, the first preset temperature difference range is 15°C to 20°C.

[0151] When the temperature of the second area is greater than a first preset temperature, the controller controls the first solenoid valve 13 to close the first connecting pipeline. The first preset temperature is greater than 40°C.

[0152] Whether the second heat exchange circuit is activated or not needs to be determined based on the ambient temperature and the temperature of the battery itself. If the battery is in a high temperature environment (40 to 50 degrees), the temperature of the second area of ​​the battery has become very high and the second area of ​​the battery does not need to be heated again, and the second heat exchange circuit is in a stopped state; if the battery temperature is below 40 degrees, the second heat exchange circuit is in an activated state.

[0153] In one possible implementation, when the temperature of the first area and the temperature of the second area are both lower than the second preset temperature, the controller controls the first heat exchange circuit to close and the third heat exchange circuit to open. The controller is also used to control the second heat exchange circuit to open. At this time, the first area and the second area of ​​the battery can be heated so that the battery can operate normally even in a cold environment. The second preset temperature is less than 10°. In the state where the battery thermal management system heats both the first area and the second area, it is also necessary to monitor the temperature of the first area and the second area in real time to ensure that the temperature difference between the first area and the second area is within 5°.

[0154] It should be noted that the action instructions of the controller may also be based on the values ​​of the temperature sensors in the heat exchange circuit.

[0155] An embodiment of the present application further provides a battery system, wherein the battery system includes a battery cell 300 and the battery thermal management system 1000 described in any of the above embodiments, and the heat exchange component 200 of the battery thermal management system 1000 exchanges heat with the battery cell 300.

[0156] Since the battery system includes the battery thermal management system 1000 described in the first aspect, and thus has the structure and beneficial effects of the battery thermal management system 1000, this embodiment will not be further described here.

[0157] The present application also provides an electrical device, including an electrical device and the battery system described in any of the above embodiments, wherein the battery cells of the battery system are connected to the electrical device to provide electrical energy to the electrical device.

[0158] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0159] In addition, the electrical device may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships, spacecraft, and charging stations. The spacecraft may include airplanes, rockets, space shuttles, or spacecraft.

[0160] Since the electric device in this embodiment includes the battery system described in any of the above embodiments, the structure and beneficial effects of the electric device including the battery system will not be further described in this embodiment.

[0161] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0162] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery thermal management system, characterized in that: include: A heat exchange system (100), the heat exchange system (100) comprising a compressor (110) and a first heat exchanger (130); wherein the first heat exchanger (130) comprises a relatively independent first heat exchange pipeline (131) and a second heat exchange pipeline (132), and the first heat exchange pipeline (131) and the second heat exchange pipeline (132) exchange heat with each other; The heat exchange component (200) is used to exchange heat with the battery; wherein the heat exchange component (200) comprises a first heat exchange portion (210) and a second heat exchange portion (220); One end of the first heat exchange pipeline (131) is connected to the compressor (110), and the other end of the first heat exchange pipeline (131) is connected to the first heat exchange portion (210) of the heat exchange component (200); and both ends of the second heat exchange pipeline (132) are respectively connected to the second heat exchange portion (220) of the heat exchange component (200).

2. The battery thermal management system according to claim 1, characterized in that: The first heat exchange portion (210) is located at least on one side of the second heat exchange portion (220); or, the first heat exchange portion (210) surrounds a portion of the outer circumference of the second heat exchange portion (220).

3. The battery thermal management system according to claim 2, characterized in that: The second heat exchange portion (220) and the second heat exchange pipeline (132) form a second heat exchange circuit; The second heat exchange circuit comprises a first connecting pipeline (12), wherein the first connecting pipeline (12) is connected between the outlet end and the inlet end of the second heat exchange pipeline (132).

4. The battery thermal management system according to claim 3, characterized in that: The first connecting pipeline (12) is provided with a first solenoid valve (13), and the first solenoid valve (13) is configured to control the first connecting pipeline (12) to be disconnected or the first connecting pipeline (12) to be connected.

5. The battery thermal management system according to claim 3, characterized in that: The heat exchange system further comprises a second solenoid valve (14), wherein the second solenoid valve (14) is connected between the outlet end of the first heat exchange pipeline (131) and the second heat exchange part (220).

6. The battery thermal management system according to claim 3, characterized in that: The heat exchange system (100) further includes a first drive pump (15), wherein the first drive pump (15) is arranged in the second heat exchange circuit; And / or, the heat exchange system further comprises a first expansion water tank (16), wherein the first expansion water tank (16) is arranged in the second heat exchange circuit and is used to provide a circulating medium to the second heat exchange pipeline (132).

7. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The heat exchange system further comprises a first heating element (140), wherein the first heating element (140) is connected between the second heat exchange portion (220) and the second heat exchange pipeline (132).

8. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The compressor (110) and the first heat exchanger (130) form a first heat exchange circuit; the heat exchange system further comprises a condenser (120), the condenser (120) being connected to the first heat exchange circuit and being located between the compressor (110) and the first heat exchanger (130).

9. The battery thermal management system according to claim 8, characterized in that: The heat exchange system further comprises an evaporator (150), wherein the evaporator (150) is connected to the first heat exchange circuit; A first end of the evaporator (150) is connected to the outlet end of the first heat exchange pipeline (131), and a second end of the evaporator (150) is connected to the compressor (110); Alternatively, a first end of the evaporator (150) is connected to the condenser (120), and a second end of the evaporator (150) is connected to the compressor (110).

10. The battery thermal management system according to claim 9, characterized in that: The heat exchange system (100) further includes a first heat exchange branch (19), the first heat exchange branch (19) connecting the first heat exchange pipeline (131) and the condenser (120), and a third solenoid valve (21) is provided on the first heat exchange branch (19); And / or, the heat exchange system (100) further comprises a second heat exchange branch (20), the second heat exchange branch (20) connecting the first end of the evaporator (150) and the condenser (120), and a fourth solenoid valve (22) is provided on the second heat exchange branch (20).

11. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The heat exchange system (100) further comprises a first one-way valve (17), wherein the first one-way valve (17) is connected between the outlet end of the first heat exchange pipeline (131) and the first heat exchange part (210).

12. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The circulating medium in the first heat exchange pipeline (131) and the circulating medium in the second heat exchange pipeline (132) are different.

13. The battery thermal management system according to any one of claims 1 to 6, characterized in that: The battery thermal management system further comprises a third heat exchange circuit, the third heat exchange circuit being connected to the heat-exchanged component (200) and heating a circulating medium in the heat-exchanged component (200).

14. The battery thermal management system according to claim 13, characterized in that: The third heat exchange circuit includes a relatively independent first sub-heat exchange circuit and a second sub-heat exchange circuit; Both ends of the first sub-heat exchange loop are respectively connected between the first end and the second end of the first heat exchange part (210); Both ends of the second sub-heat exchange circuit are respectively connected between the first end and the second end of the second heat exchange part (220).

15. The battery thermal management system according to claim 14, characterized in that: The first sub-heat exchange circuit and the second sub-heat exchange circuit exchange heat with each other.

16. The battery thermal management system according to claim 14, characterized in that: The heat exchange system further comprises a second heat exchanger (160), and the compressor (110), the component to be heat exchanged (200), and the second heat exchanger (160) form the third heat exchange loop.

17. The battery thermal management system according to claim 16, characterized in that: The second heat exchanger (160) comprises a third heat exchange pipeline (161), one end of the third heat exchange pipeline (161) is connected to the first heat exchange portion (210), and the other end of the third heat exchange pipeline (161) is connected to the compressor (110); the third heat exchange pipeline (161), the compressor (110), and the first heat exchange portion (210) of the heat exchange component (200) form a first sub-heat exchange loop; And / or, the second heat exchanger (160) further includes a fourth heat exchange pipeline (162), wherein the fourth heat exchange pipeline (162) is connected to the second heat exchange part (220) and forms a second sub-heat exchange loop with the second heat exchange part (220).

18. The battery thermal management system according to claim 17, characterized in that: The heat exchanger further comprises a gas-liquid separator (190), one end of the third heat exchange pipeline (161) is connected to the first heat exchange part (210), and the other end of the third heat exchange pipeline (161) is connected to the compressor (110) through the gas-liquid separator (190); the third heat exchange pipeline (161), the compressor (110), the gas-liquid separator (190) and the first heat exchange part (210) of the heat exchange component (200) form a first sub-heat exchange loop.

19. The battery thermal management system according to claim 17, characterized in that: The fourth heat exchange pipeline (162) and the third heat exchange pipeline (161) exchange heat with each other.

20. The battery thermal management system according to claim 17, characterized in that: The second sub-heat exchange circuit is provided with a second heating element (170).

21. The battery thermal management system according to claim 20, characterized in that: The battery thermal management system further includes a fourth heat exchange branch (29), the fourth heat exchange branch (29) being connected to the second sub-heat exchange loop and connected in parallel with the fourth heat exchange pipeline (162).

22. The battery thermal management system according to claim 21, characterized in that: The fourth heat exchange branch (29) is provided with a second drive pump (26) and a second expansion water tank (27), and the second expansion water tank (27) is used to provide a circulating medium to the second heat exchange part (220).

23. The battery thermal management system according to claim 22, characterized in that: The first heat exchanger (130) is connected to the second sub-heat exchange circuit.

24. The battery thermal management system according to any one of claims 14 to 23, characterized in that: A seventh solenoid valve (28) is provided between the first end of the first heat exchange portion (210) and the compressor (110).

25. The battery thermal management system according to claim 24, characterized in that: The battery thermal management system further comprises a controller; wherein the first heat exchange portion (210) is used to exchange heat with a first area of ​​the battery, and the second heat exchange portion (220) is used to exchange heat with a second area of ​​the battery; The controller is used to control the working state of each heat exchange circuit according to the temperature difference between the first area and the second area.

26. The battery thermal management system according to claim 25, characterized in that: If the temperature difference between the first region and the second region is within a first preset temperature difference range, the controller controls the first heat exchange loop and the second heat exchange loop to start, and controls the third heat exchange loop to shut down.

27. The battery thermal management system according to claim 26, characterized in that: When the temperature of the second area is greater than the first preset temperature, the controller closes the first connecting pipeline by controlling the first solenoid valve (13).

28. The battery thermal management system according to claim 27, characterized in that: When the temperature of the first region and the temperature of the second region are both lower than a second preset temperature, the controller controls the first heat exchange circuit to be closed and the third heat exchange circuit to be opened.

29. The battery thermal management system according to claim 28, characterized in that: The controller is further configured to control the second heat exchange circuit to open.

30. A battery system, characterized in that: Comprising a battery cell and the battery thermal management system according to any one of claims 1 to 29; The heat-exchange component of the battery thermal management system exchanges heat with the battery cell.

31. An electrical device, characterized in that: The invention comprises an electric device and the battery system according to claim 30, wherein the battery cells of the battery system are connected to the electric device to provide electric energy to the electric device.

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