Battery thermal management system and vehicle

Abstract

The utility model provides a battery thermal management system. The battery thermal management system comprises a thermal management loop used for being communicated with a battery cold plate; the heat management loop comprises a main pipeline and a branch pipeline which are connected with each other; the branch pipeline comprises a cooling branch, a heating branch and a temperature equalizing branch which are arranged in parallel; wherein a driving part is arranged on the main pipeline, a cooling part is arranged on the cooling branch, and a heating part is arranged on the heating branch. More execution actions are provided for thermal management of the battery, so that the temperature of the battery can be flexibly managed to exert the maximum use efficiency of the battery, and the performance of the battery is optimized on the premise of saving the cost. The utility model further provides a vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a battery thermal management system and a vehicle. Background Art

[0002] In the prior art, a battery direct cooling system is used to control the battery temperature. In this battery direct cooling system, air conditioning refrigerant is passed into the battery cold plate to cool the battery. This system has problems such as low temperature and insufficient refrigerant flow, and causes large temperature differences between the batteries. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a battery thermal management system and a vehicle to solve the problem of large battery temperature differences.

[0004] Based on the above objectives, the present invention provides a battery thermal management system, including a thermal management circuit for communicating with a battery cold plate; the thermal management circuit includes a main pipeline and branch pipelines connected thereto; the branch pipelines include a cooling branch, a heating branch, and a temperature equalizing branch arranged in parallel;

[0005] Wherein, a driving component is provided on the main pipeline, a cooling component is provided on the cooling branch, and a heating component is provided on the heating branch.

[0006] Furthermore, the branch line also includes a first sub-line, one end of which is connected to one end of the heating branch close to the main line, and the other end is connected to the main line, and is located between the driving component and the battery cold plate.

[0007] Furthermore, the branch line also includes a second sub-line, and the heating branch and the temperature equalizing branch are both connected to the main line through the second sub-line.

[0008] Furthermore, the heating branch, the temperature equalizing branch, the first sub-pipeline and the second sub-pipeline are connected through a four-way valve.

[0009] Furthermore, the first sub-pipeline is connected to the main pipeline via a first three-way valve.

[0010] Furthermore, the main pipeline is connected to the cooling branch and the second sub-pipeline through a second three-way valve.

[0011] Furthermore, the branch line further includes a third sub-line, and the ends of the heating branch and the cooling branch away from the main line are both connected to the battery cold plate through the third sub-line.

[0012] Furthermore, the battery cold plate is connected to the temperature equalizing branch and the third sub-pipeline via a third three-way valve.

[0013] Furthermore, the battery thermal management system further includes an air conditioning refrigerant circuit for communicating with the battery cold plate, the air conditioning refrigerant circuit including a main circuit and a branch circuit connected in parallel, the branch circuit including a condensing circuit and an evaporating circuit;

[0014] The total circuit is provided with a first expansion valve, the condensing circuit is provided with a condenser and a compressor, and the evaporating circuit is provided with a second expansion valve and an evaporator.

[0015] Based on the same inventive concept, the present application also provides a vehicle, including the battery thermal management system described above.

[0016] As can be seen from the above, the utility model provides a battery thermal management system, which forms a thermal management circuit with cooling, heating and temperature equalization functions by setting a branch line including a cooling branch, a heating branch and a temperature equalization branch and a main line including a driving part. The thermal management circuit is connected to the battery cold plate to achieve cooling, heating and temperature equalization of the battery cold plate. In addition, the thermal management circuit is a liquid water medium circuit, which is driven by the driving part to contact the cooling part on the cooling branch to achieve cooling, and flows into the battery cold plate to achieve cooling of the battery cold plate. Contact is used to achieve heating, and the liquid flows into the battery cold plate to achieve heating of the battery cold plate. Driven by the driving component, it flows into the battery cold plate in the temperature equalization branch to achieve temperature equalization of the battery cold plate, thereby achieving cooling, heating and temperature equalization of the battery. Due to the good thermal conductivity of liquid water, there is no problem of large temperature difference in the thermal management circuit on the battery cold plate, thereby avoiding the situation of large temperature and uneven temperature of the battery. At the same time, it also provides more execution actions for battery thermal management, so that the battery temperature can be flexibly managed to maximize the use efficiency of the battery and optimize battery performance while saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the battery thermal management system of the utility model embodiment Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the battery thermal management system of the utility model embodiment Figure 2 .

[0020] In the figure: 01, battery cold plate; 100, thermal management circuit; 11, main pipeline; 111, drive element; 12, branch pipeline; 13, cooling branch; 131, cooling element; 14, heating branch; 141, heating element; 15, temperature equalization branch; 16, first sub-pipeline; 17, second sub-pipeline; 18, four-way valve; 19, first three-way valve; 20, second three-way valve; 21, third sub-pipeline; 22, third three-way valve; 200, air conditioning refrigerant circuit; 201, main circuit; 202, branch circuit; 203, condensing circuit; 204, evaporating circuit; 205, first expansion valve; 206, condenser; 207, compressor; 208, second expansion valve; 209, evaporator. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0023] At present, as global environmental problems become increasingly serious, electric vehicles as new energy vehicles have developed rapidly.

[0024] Electric vehicles use power batteries as their energy source, and power batteries generally have better performance in the temperature range of 15℃ to 35℃. Too low temperature will cause their capacity to decay rapidly, and even lithium deposition at the negative electrode, causing safety hazards; and too high battery temperature will easily cause overheating or even thermal runaway.

[0025] The current method of using a direct cooling system to control battery temperature is to use a vehicle's air conditioning refrigerant (i.e., air conditioning refrigerant) directly into the battery cold plate. Although this has the characteristic of fast battery cooling rate, it also has the problem of difficult temperature uniformity control. In addition, a battery heating film needs to be added for oscillating heating. At low temperatures, the waste heat from the engine or drive system cannot be recovered for heating, resulting in high control costs.

[0026] Based on this, the present application proposes a battery thermal management system and a vehicle to solve the problems of large battery temperature difference and high heating cost.

[0027] The present application is described in detail below through one or more specific embodiments. Figure 1 and Figure 2 As shown, it includes a thermal management circuit 100 for communicating with the battery cold plate 01; the thermal management circuit 100 includes a main pipeline 11 and a branch line 12 connected thereto; the branch line 12 includes a cooling branch 13, a heating branch 14 and a temperature equalizing branch 15 arranged in parallel;

[0028] The main pipeline 11 is provided with a driving component 111 , the cooling branch 13 is provided with a cooling component 131 , and the heating branch 14 is provided with a heating component 141 .

[0029] Specifically, one end of the main pipeline 11 is connected to the battery cold plate 01, and the other end is connected to the cooling branch 13, the heating branch 14 and the temperature equalizing branch 15 of the branch line 12. One end of the cooling branch 13, the heating branch 14 and the temperature equalizing branch 15 are connected to the main pipeline 11, and the other end is connected to the battery cold plate 01, thereby respectively realizing the communication between the cooling branch 13 and the battery cold plate 01, the communication between the heating branch 14 and the battery cold plate 01, and the communication between the temperature equalizing branch 15 and the battery cold plate 01, so that the thermal management circuit 100 can respectively cool, equalize and heat the battery cold plate 01, realize detailed thermal management of the battery, and facilitate improved battery efficiency and safety performance.

[0030] The thermal management circuit 100 is a medium circuit, and the medium is a liquid medium. The driving member 111 on the main pipeline 11 drives the operation of the cooling branch 13, the heating branch 14, and the temperature equalizing branch 15, so that the liquid medium, driven by the driving member 111, passes through the cooling member 131 on the cooling branch 13, the heating member 141 on the heating branch 14, or the temperature equalizing branch 15, and runs until it contacts the battery cold plate 01, thereby achieving cooling, heating, and temperature equalization of the battery cold plate 01.

[0031] The heating element 141 is a heat-generating structure for heating the liquid medium flowing through the heating element 141, thereby heating the liquid medium flowing into the battery cold plate 01 through the heating element 141, and heating the battery cold plate 01 by the heated liquid medium; equivalently, the cooling element 131 is a cooling structure for cooling the liquid medium flowing through the cooling element 131, thereby cooling the liquid medium flowing into the battery cold plate 01 through the cooling element 131, and cooling the battery cold plate 01 by the cooled liquid medium.

[0032] Exemplarily, the driving member 111 is an electric pump, the cooling member 131 on the cooling branch 13 is a radiator, and the heating member 141 on the heating branch 14 is an electric drive assembly. The setting of the heating member 141 can utilize the waste heat of the motor, recycle energy, reduce costs, and be environmentally friendly.

[0033] In addition, the operation of the cooling branch 13, the heating branch 14, and the temperature equalizing branch 15 depends on which branch the main pipeline 11 is connected to, so that the branch can be connected to the battery cold plate 01, thereby allowing the branch to cool, heat, or equalize the temperature of the battery cold plate 01.

[0034] In this embodiment, a branch line 12 including a cooling branch 13, a heating branch 14 and a temperature equalizing branch 15 and a main line 11 including a driving member 111 are provided to form a thermal management loop 100 having cooling, heating and temperature equalizing functions. The thermal management loop 100 is connected to the battery cold plate 01 to achieve cooling, heating and temperature equalization of the battery cold plate 01. In addition, the thermal management loop 100 is a liquid water medium loop. Driven by the driving member 111, it contacts the cooling member 131 on the cooling branch 13 to achieve cooling, flows into the battery cold plate 01 to achieve cooling of the battery cold plate 01, and contacts the heating member 131 on the heating branch 14 under the drive of the driving member 111. The liquid contacts the battery cold plate 01 to achieve heating, flows into the battery cold plate 01 to achieve heating of the battery cold plate 01, and flows into the battery cold plate 01 in the temperature equalization branch 15 driven by the driving member 111 to achieve temperature equalization of the battery cold plate 01, thereby achieving cooling, heating and temperature equalization of the battery. Due to the good thermal conductivity of liquid water, the thermal management circuit 100 does not have the problem of large temperature difference on the battery cold plate 01, thereby avoiding the situation of large temperature and uneven temperature of the battery. At the same time, it also provides more execution actions for battery thermal management, so that the battery temperature can be flexibly managed to maximize the use efficiency of the battery and optimize battery performance while saving costs.

[0035] In some embodiments, the branch line 12 further includes a first sub-line 16 , one end of which is connected to one end of the heating branch 14 close to the main line 11 , and the other end is connected to the main line 11 , and is located between the driving member 111 and the battery cold plate 01 .

[0036] Specifically, the first sub-pipeline 16 is used to connect the heating element 141 on the heating branch 14 and the driving element 111 on the main pipeline 11, and to form a new branch with the heating element 141, the driving element 111 and the cooling element 131. Driven by the driving element 111, the branch can allow the liquid medium to flow through the cooling element 131 and the heating element 141, thereby cooling the heating element 141 and avoiding the temperature of the heating element 141 being too high, which affects the stability of the thermal management system.

[0037] Exemplarily, the heating element 141 is an electric drive assembly. During actual use, the temperature of the electric drive assembly is related to the startup time, ambient temperature, etc. When the temperature of the electric drive assembly is too high, the branch circuit is started to allow the cooling element 131 to cool the electric drive assembly, which is beneficial to the stable operation of the electric drive assembly and further beneficial to the stable operation of the thermal management system.

[0038] In some embodiments, the branch line 12 further includes a second sub-line 17 , and the heating branch 14 and the temperature equalizing branch 15 are both connected to the main line 11 through the second sub-line 17 .

[0039] Specifically, one end of the second sub-line 17 is connected to an end of the main line 11 away from the battery cold plate 01, and the other end of the second sub-line 17 is connected to the temperature equalizing branch 15 and the heating branch 14 at the same time, so that the main line 11 is connected to the temperature equalizing branch 15 and the heating branch 14.

[0040] The setting of the second sub-pipeline 17 can simplify the connection between the main pipeline 11 and the branch pipeline 12. The temperature equalizing branch 15 and the heating branch 14 can be connected through the second sub-pipeline 17, which is beneficial to the setting and connection of the main pipeline 11, thereby making the setting of the thermal management circuit 100 simple and the connection stable, which is beneficial to the stable operation of the battery thermal management system.

[0041] In some embodiments, the heating branch 14 , the temperature equalizing branch 15 , the first sub-pipeline 16 and the second sub-pipeline 17 are connected via a four-way valve 18 .

[0042] Specifically, the first sub-pipeline 16 is connected to the heating branch 14 and the temperature equalizing branch 15 at the same time, and the second sub-pipeline 17 is connected to the heating branch 14. Setting the first sub-pipeline 16 and the second sub-pipeline 17 to be connected to one end of the heating branch 14 at the same time can simplify the setting of the thermal management circuit 100 and also simplify the connectivity control of each branch on the thermal management circuit 100.

[0043] The four-way valve 18 is arranged so that the first sub-pipeline 16, the second sub-pipeline 17, the temperature-averaging branch 15 and the heating branch 14 are connected, that is, the four-way valve 18 has four connection ports, and the four connection ports are respectively connected to the first sub-pipeline 16, the second sub-pipeline 17, the temperature-averaging branch 15 and the heating branch 14. By switching the connecting ports in the four-way valve 18, the first sub-pipeline 16, the second sub-pipeline 17, the temperature-averaging branch 15 and the heating branch 14 are connected in pairs, thereby enabling the thermal management circuit 100 to play different roles, facilitating control while also simplifying the setting of the thermal management circuit 100.

[0044] In some embodiments, the first sub-pipeline 16 is connected to the main pipeline 11 via a first three-way valve 19 .

[0045] Specifically, the first sub-pipeline 16 is used to connect the driving member 111 on the main pipeline 11 and the heating branch 14. The first three-way valve 19 has three connection ports, one of which is connected to the heating branch 14, and the other two ports are located on the main pipeline 11 to connect the main pipeline 11.

[0046] The first three-way valve 19 is set to connect the first sub-pipeline 16 with the main pipeline 11, and can also control the connection direction of the main pipeline 11, thereby controlling the operation branch of the thermal management circuit 100, which is convenient for setting and control.

[0047] In some embodiments, the main pipeline 11 is connected to the cooling branch 13 and the second sub-pipeline 17 via a second three-way valve 20 .

[0048] Specifically, the end of the main pipeline 11 is connected to the second sub-pipeline 17 and the cooling branch 13 at the same time, and the second three-way valve 20 is set so that the end of the main pipeline 11 is connected to the second sub-pipeline 17 and the cooling branch 13 at the same time, that is, the second three-way valve 20 has three connection ports, and the three connection ports are respectively connected to the main pipeline 11, the second sub-pipeline 17 and the cooling branch 13. By adjusting the second three-way valve 20, the main pipeline 11 is adjusted to be connected with the second sub-pipeline 17 or the cooling branch 13, thereby realizing the control of the operation of different branches. The setting is simple and easy to control.

[0049] For example, the heating element 141 is an electric drive assembly. When the temperature of the heating element 141 is too high, it is necessary to control the cooling element 131 in the thermal management circuit 100 to cool the heating element 141. At this time, the first three-way valve 19 is switched to disconnect the driving element 111 from the battery cold plate 01, and the driving element 111 is connected to the first sub-pipeline 16. The second three-way valve 20 is switched to connect the main pipeline 11 to the cooling branch 13 and then to the cooling element 131. The four-way valve 20 is switched to disconnect the driving element 111 from the battery cold plate 01 and connect the driving element 111 to the first sub-pipeline 16. Valve 18 connects the heating branch 14 with the first sub-pipeline 16, thereby connecting the driving member 111, the cooling branch 13, the heating branch 14 and the first sub-pipeline 16. The driving member 111 drives the liquid medium in the pipeline to flow into the cooling member 131 of the cooling branch 13 for cooling, and then flows into the heating member 141 of the heating branch 14 to cool the heating member 141 (i.e., the electric drive assembly), thereby cooling the electric drive assembly and preventing the electric drive assembly from being overly hot and affecting its normal operation.

[0050] In some embodiments, the branch line 12 further includes a third sub-line 21 , and the ends of the heating branch 14 and the cooling branch 13 away from the main line 11 are both connected to the battery cold plate 01 through the third sub-line 21 .

[0051] Specifically, the heating branch 14 , the cooling branch 13 , and the temperature equalizing branch 15 are all connected to the main pipeline 11 at one end, connected to the battery cold plate 01 through the main pipeline 11 , and connected to the battery cold plate 01 at the other end to achieve communication with the battery cold plate 01 .

[0052] The third sub-pipeline 21 is provided so that the heating branch 14 and the cooling branch 13 are connected to the battery cold plate 01 through the third sub-pipeline 21 , thereby avoiding the need for multiple pipelines to be connected to the battery cold plate 01 , thereby simplifying the configuration of the thermal management loop 100 and facilitating its widespread application.

[0053] In addition, the provision of the third sub-pipeline 21 is also beneficial for cooling the heating element 141 on the heating branch 14 , that is, the heating branch 14 and the cooling branch 13 are connected through the third sub-pipeline 21 , which facilitates cooling the heating element 141 .

[0054] It should be noted that the main pipeline 11 is connected to one end of the battery cold plate 01, and the heating branch 14, the cooling branch 13, and the temperature equalizing branch 15 are connected to the other end of the battery cold plate 01. Through the connection between the main pipeline 11 and the heating branch 14, the cooling branch 13, and the temperature equalizing branch 15, the liquid medium can enter the battery cold plate 01 through different pipelines and flow out from the other end of the battery cold plate 01. That is, the liquid medium flows through the battery cold plate 01, so that the battery cold plate 01 is evenly contacted with the liquid medium. The liquid medium can evenly transfer temperature to the battery cold plate 01, thereby avoiding a large temperature difference in the battery cold plate 01.

[0055] In some embodiments, the battery cold plate 01 is connected to the temperature equalizing branch 15 and the third sub-pipeline 21 via a third three-way valve 22 .

[0056] Specifically, the heating branch 14 and the cooling branch 13 are connected to the battery cold plate 01 via the third sub-pipeline 21, and the temperature-averaging branch 15 is connected to the battery cold plate 01. The third three-way valve 22 is provided at the connection with the battery cold plate 01. The third three-way valve 22 has three ports: one port connected to the battery cold plate 01, one port connected to the temperature-averaging branch 15, and one port connected to the third sub-pipeline 21. By controlling the connected port in the third three-way valve 22, the third sub-pipeline 21 or the temperature-averaging branch 15 is controlled to be connected to the battery cold plate 01, thereby facilitating the control of the operation of the temperature-averaging branch 15, the cooling branch 13, and the heating branch 14.

[0057] In some embodiments, the battery thermal management system further includes an air conditioning refrigerant circuit 200 for communicating with the battery cold plate 01 , wherein the air conditioning refrigerant circuit 200 includes a main circuit 201 and a branch circuit 202 connected in parallel, wherein the branch circuit 202 includes a condensing circuit 203 and an evaporating circuit 204 connected in parallel;

[0058] The main circuit 201 is provided with a first expansion valve 205 , the condensing circuit 203 is provided with a condenser 206 and a compressor 207 , and the evaporating circuit 204 is provided with a second expansion valve 208 and an evaporator 209 .

[0059] Specifically, the two ends of the air conditioning refrigerant circuit 200 are connected to the two ends of the battery cold plate 01, allowing the refrigerant in the air conditioning refrigerant circuit 200 to enter the battery cold plate 01 and cool the battery cold plate 01. The condensation circuit 203 is used to generate and transport refrigerant, and the evaporation circuit 204 is used to recover water vapor generated during the cooling process of the battery cold plate 01.

[0060] In this embodiment, the air-conditioning refrigerant circuit 200 and the thermal management circuit 100 are used in conjunction with each other to perform thermal management on the battery cold plate 01 , thereby improving the thermal management redundancy of the battery cold plate 01 .

[0061] For example, in actual use, the heating element 141 in the thermal management circuit 100 is an electric drive assembly. The use of the thermal management circuit 100 and the air conditioning refrigerant circuit 200 can be divided into the following categories:

[0062] The first type: When the ambient temperature is ≥30°C and the maximum battery temperature is ≥40°C, the thermal management circuit 100 is a medium circuit, and the medium is greatly affected by the ambient temperature. At this time, the thermal management circuit 100 has a limited cooling effect on the battery cold plate 01. In this case, the air conditioning refrigerant circuit 200 is activated to cool the battery cold plate 01, which can quickly achieve battery cooling, avoid thermal runaway, and promote battery safety.

[0063] The second type: the ambient temperature is less than 30°C, the maximum battery temperature is greater than or equal to 40°C, and the electric drive assembly (i.e., the heating element 141) has a cooling request signal. In other words, the cooling element 131 in the thermal management circuit 100 needs to cool the heating element 141, and the air conditioning refrigerant circuit 200 is activated to cool the battery cold plate 01.

[0064] The third type: when the ambient temperature is less than 30°C, the maximum battery temperature is greater than or equal to 40°C, and there is no cooling request signal from the electric drive assembly (i.e., the heating element 141), the cooling branch 13 in the thermal management circuit 100 is activated to cool the battery cold plate 01. At this time, the first three-way valve 19 is controlled to connect the driving element 111 on the main pipeline 11 with the battery cold plate 01, the second three-way valve 20 is controlled to connect the main pipeline 11 with the cooling branch 13, and the third three-way valve 22 is controlled to connect the third sub-pipeline 21 with the battery cold plate 01. That is, the cooling branch 13 is connected to the battery cold plate 01. At this time, the main pipeline 11, the cooling branch 13, the third sub-pipeline 21 and the battery cold plate 01 are connected, and the thermal management circuit 100 cools the battery cold plate 01.

[0065] Fourth mode: when the minimum battery temperature is ≤5°C, the heating branch 14 in the thermal management circuit 100 is activated to heat the battery cold plate 01. At this time, the first three-way valve 19 is controlled to connect the driving member 111 on the main pipeline 11 with the battery cold plate 01. The second three-way valve 20 is controlled to connect the main pipeline 11 with the second sub-pipeline 17. The third three-way valve 22 is controlled to connect the third sub-pipeline 21 with the battery cold plate 01. That is, the heating branch 14 is connected to the battery cold plate 01. At this time, the main pipeline 11, the second sub-pipeline 17, the heating branch 14, the third sub-pipeline 21 and the battery cold plate 01 are connected, and the thermal management circuit 100 heats the battery cold plate 01.

[0066] Fifth: When the battery sends a thermal runaway signal, the temperature averaging branch 15 in the thermal management circuit 100 is activated to average the temperature of the battery cold plate 01, thereby achieving a uniform battery temperature and preventing thermal runaway. At this time, the first three-way valve 19 is controlled to connect the driving member 111 on the main pipeline 11 to the battery cold plate 01, the second three-way valve 20 is controlled to connect the main pipeline 11 to the second sub-pipeline 17, and the third three-way valve 22 is controlled to connect the temperature averaging branch 15 to the battery cold plate 01. At this time, the main pipeline 11, the second sub-pipeline 17, the temperature averaging branch 15, and the battery cold plate 01 are connected, and the thermal management circuit 100 averages the temperature of the battery cold plate 01.

[0067] Type 6: When the difference between the maximum battery temperature and the minimum battery temperature is ≥15°C, that is, when the battery temperature difference is large, the temperature averaging branch 15 in the thermal management circuit 100 is activated to average the temperature of the battery cold plate 01, thereby averaging the battery temperature and shortening the battery temperature difference. At this time, the first three-way valve 19 is controlled to connect the driving member 111 on the main pipeline 11 with the battery cold plate 01, the second three-way valve 20 is controlled to connect the main pipeline 11 with the second sub-pipeline 17, and the third three-way valve 22 is controlled to connect the temperature averaging branch 15 with the battery cold plate 01. At this time, the main pipeline 11, the second sub-pipeline 17, the temperature averaging branch 15, and the battery cold plate 01 are connected, and the thermal management circuit 100 averages the temperature of the battery cold plate 01.

[0068] Seventh type: When the maximum battery temperature is ≥45°C and the difference between the maximum and minimum battery temperatures is ≥15°C, the temperature averaging branch 15 in the thermal management circuit 100 is activated to average the temperature of the battery cold plate 01 to reduce the battery temperature difference. At the same time, the air conditioning refrigerant circuit 200 is activated to cool the battery cold plate 01 to prevent the battery temperature from being too high and affecting the battery discharge efficiency and causing safety problems.

[0069] Based on the same inventive concept, the present application also provides a vehicle, including the battery thermal management system described above, the beneficial effects of which are the same as those of the battery thermal management system described above, and will not be repeated here.

[0070] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0071] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery thermal management system, characterized in that: It includes a thermal management circuit for communicating with the battery cold plate; the thermal management circuit includes a main pipeline and branch lines connected thereto; the branch lines include a cooling branch, a heating branch, and a temperature equalizing branch arranged in parallel; Wherein, a driving component is provided on the main pipeline, a cooling component is provided on the cooling branch, and a heating component is provided on the heating branch.

2. The battery thermal management system according to claim 1, characterized in that: The branch line further includes a first sub-line, one end of which is connected to an end of the heating branch close to the main line, and the other end is connected to the main line, and is located between the driving component and the battery cold plate.

3. The battery thermal management system according to claim 2, characterized in that: The branch line further includes a second sub-line, and the heating branch and the temperature equalizing branch are both connected to the main line through the second sub-line.

4. The battery thermal management system according to claim 3, characterized in that: The heating branch, the temperature equalizing branch, the first sub-pipeline and the second sub-pipeline are connected through a four-way valve.

5. The battery thermal management system according to claim 2, characterized in that: The first sub-pipeline is connected to the main pipeline via a first three-way valve.

6. The battery thermal management system according to claim 3, characterized in that: The main pipeline is connected to the cooling branch and the second sub-pipeline through a second three-way valve.

7. The battery thermal management system according to claim 1, characterized in that: The branch line further includes a third sub-line, and ends of the heating branch and the cooling branch away from the main line are both connected to the battery cold plate through the third sub-line.

8. The battery thermal management system according to claim 7, characterized in that: The battery cold plate is connected to the temperature equalizing branch and the third sub-pipeline through a third three-way valve.

9. The battery thermal management system according to claim 1, characterized in that: Also included is an air conditioning refrigerant circuit for communicating with the battery cold plate, the air conditioning refrigerant circuit including a main circuit and a branch circuit connected in parallel, the branch circuit including a condensing circuit and an evaporating circuit; The total circuit is provided with a first expansion valve, the condensing circuit is provided with a condenser and a compressor, and the evaporating circuit is provided with a second expansion valve and an evaporator.

10. A vehicle, characterized in that: The battery thermal management system comprises the battery thermal management system according to any one of claims 1 to 9.

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