Battery thermal management system and vehicle

Abstract

The invention relates to a battery thermal management system and a vehicle. The battery thermal management system comprises a heat pipe, a liquid cooling device and a thermal management module, the heat pipe comprises an evaporation section and a condensation section which are communicated, the evaporation section is used for being arranged on the periphery of the single battery, and heat conduction liquid is arranged in a pipe body of the heat pipe to conduct heat exchange on the single battery; the liquid cooling device is provided with a flow channel, a refrigerant is arranged in the flow channel, and the flow channel is arranged along the condensation section and is in physical contact with the condensation section so as to exchange heat with the condensation section of the heat pipe; a liquid inlet and a liquid outlet are respectively formed in two ends of the flow channel; and the heat management module is respectively communicated with the liquid inlet and the liquid outlet, so that the refrigerant circularly flows in the flow channel and the heat management module, and the refrigerant is heated or refrigerated, so that the temperature of the single battery is increased or decreased. According to the scheme provided by the invention, rapid heating or rapid cooling of the battery monomers can be realized, and the heat exchange efficiency is high.

Description

Technical Field

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

[0002] At present, the thermal management of batteries used in new energy vehicles mainly includes air cooling, liquid cooling, phase change material cooling, immersion cooling and other means.

[0003] Among them, air cooling uses air to cool the battery, but the air cooling system has low heat exchange efficiency and limited cooling effect. As for liquid cooling, the market mostly uses serpentine liquid cooling devices to cool the battery. Although the cooling and temperature control effect of the battery is good, the whole package requires serpentine plates of different specifications, which is complex in structure and difficult to maintain. At the same time, the serpentine tube also needs to be electrically insulated, otherwise there is a risk of leakage. Generally, water-ethylene glycol is used as the coolant in the serpentine liquid cooling device, which is two heat exchange media with the refrigerant of the air conditioning system. The cost of using different media is also relatively high.

[0004] Phase change material cooling uses the phase change of phase change materials when absorbing heat to maintain the battery temperature. However, the thermal conductivity of phase change materials is low, so other materials such as graphite or other cooling methods such as air cooling need to be added to improve the heat exchange effect. Phase change material cooling has high material requirements and high cost. Immersion cooling completely immerses the battery in coolant, which requires insulating coolant, is costly, difficult to package, and inconvenient to maintain. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a battery thermal management system and a vehicle, which can achieve rapid heating or cooling of battery cells and have high heat exchange efficiency.

[0006] In a first aspect, the present application provides a battery thermal management system, which includes a heat pipe, a liquid cooling device, and a thermal management module; the heat pipe includes an evaporation section and a condensation section that are connected, the evaporation section is used to be arranged on the periphery of a battery cell, and a heat transfer liquid is provided in the body of the heat pipe to exchange heat with the battery cell;

[0007] The liquid cooling device is provided with a flow channel, in which a refrigerant is arranged along the condensing section and in physical contact with the condensing section to exchange heat with the condensing section of the heat pipe; two ends of the flow channel are respectively a liquid inlet and a liquid outlet;

[0008] The thermal management module is communicated with the liquid inlet and the liquid outlet respectively, so that the refrigerant circulates in the flow channel and the thermal management module, and heats or cools the refrigerant to increase or decrease the temperature of the battery cell.

[0009] In some embodiments, a plurality of heat exchange fins are disposed on the outer peripheral wall of the condensation section, and the heat exchange fins are inserted into the flow channel.

[0010] In some embodiments, the evaporation section is provided with a heat-conducting medium, and the heat-conducting medium is arranged on the outer peripheral wall between the heat pipe and the battery cell.

[0011] In some embodiments, the heat conductive medium includes heat conductive glue and / or heat conductive sheet, the heat conductive sheet is attached to the outer wall of the battery cell or the evaporation section, and correspondingly, the heat conductive glue is coated on the outer wall of the evaporation section or the battery cell.

[0012] In some embodiments, the thermal management module includes a heat exchanger, a compressor, a reversing valve, and an expansion valve connected in sequence through a pipeline, and the heat exchanger is also connected to a liquid inlet and a liquid outlet of the flow channel, respectively, so that the refrigerant circulates in the heat exchanger, the compressor, the reversing valve, and the expansion valve according to a flow direction corresponding to a preset mode;

[0013] When the preset mode is the cooling mode, the reversing valve changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger, the compressor, the reversing valve, and the expansion valve in sequence;

[0014] When the preset mode is the heating mode, the reversing valve changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger, the expansion valve, the reversing valve and the compressor in sequence.

[0015] In some embodiments, the number of the heat pipe is one or more;

[0016] The evaporation section of a single heat pipe is respectively attached to the outer circumference of a plurality of battery cells and arranged in a conformal manner.

[0017] In some embodiments, the evaporation section of the heat pipe extends in a wave shape to fit the outer circumference of the cylindrical battery cell;

[0018] The evaporation section of the heat pipe extends in a straight line to fit the outer circumference of the square shell-shaped battery cell.

[0019] In some embodiments, the heat pipe includes a plurality of evaporation sections and one condensation section, and the condensation sections are respectively connected to the plurality of evaporation sections.

[0020] In some embodiments, the heat pipe further includes an insulating section, and the insulating section is disposed between the evaporation section and the condensation section.

[0021] A second aspect of the present application provides a vehicle, which includes a battery thermal management system as described in any of the above embodiments.

[0022] The technical solution provided by this application may have the following beneficial effects:

[0023] The battery thermal management system of the present application arranges the flow channel of the condensing device along the condensing section and makes the flow channel physically contact with the condensing section so that the refrigerant flowing in the flow channel can fully contact with the condensing section, thereby improving the heat exchange efficiency between the condensing section and the refrigerant. The evaporation section is arranged on the periphery of the battery cell to conduct heat between the evaporation section and the battery cell. In the cooling mode, the heat-conducting fluid in the evaporation section can absorb the heat of the battery cell and then vaporize and flow toward the condensing section, so that the refrigerant quickly cools the vaporized heat-conducting fluid, thereby cooling the single battery. In the heating mode, when the refrigerant in a high-temperature state flows through the condensing section, the heat-conducting fluid in the condensing section can absorb the heat of the refrigerant and vaporize. The vaporized heat-conducting fluid flows to the evaporation section and is transferred to the battery cells around the evaporation section through heat, thereby heating the battery. This design, through the high thermal conductivity of the heat pipe and the refrigerant flowing in the flow channel, can not only quickly cool the battery cells under high temperature or charging and discharging, but also quickly heat the battery cells at low temperatures, ensuring that the battery cells operate within the optimal temperature range, achieving rapid heating or cooling of the battery cells, and high heat exchange efficiency.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0026] Figure 1 is a schematic structural diagram of a battery thermal management system shown in an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the structure of a heat pipe shown in an embodiment of the present application;

[0028] Figure 3 is a schematic diagram of the structure of a heat pipe and a liquid cooling device shown in an embodiment of the present application;

[0029] Figure 4 yes Figure 3 A perspective view of the three-dimensional structure of the liquid cooling device is shown;

[0030] Figure 5 yes Figure 3 A schematic structural diagram of the liquid cooling device from another perspective is shown.

[0031] Reference numerals:

[0032] Heat pipe 1; evaporation section 11; heat transfer medium 111; condensation section 12; heat exchange fin 121; insulation section 13;

[0033] Liquid cooling device 2; flow channel 21; liquid infusion channel 211; connecting channel 212; liquid inlet 22; liquid outlet 23; housing 24;

[0034] Thermal management module 3; heat exchanger 31; compressor 32; reversing valve 33; expansion valve 34;

[0035] Battery cell 4;

[0036] Heat exchanger 5. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0038] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0039] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the related art, the existing thermal management system does not have an ideal thermal conductivity effect on the battery, resulting in the inability to dissipate heat from the battery in a timely manner.

[0041] In response to the above problems, the embodiments of the present application provide a battery thermal management system and a vehicle, which can achieve rapid heating or cooling of battery cells and have high heat exchange efficiency.

[0042] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0043] See also Figure 1 and Figure 2 The battery thermal management system in one embodiment of the present application includes a heat pipe 1, a liquid cooling device 2, and a thermal management module 3. The heat pipe 1 includes an evaporation section 11 and a condensation section 12 that are connected. The evaporation section 11 is used to be arranged at the periphery of the battery cell 4, and the heat generated by the battery cell 4 can be transferred to the evaporation section 11. The heat pipe 1 has a heat transfer liquid in the tube body, and the heat transfer liquid can flow between the evaporation section 11 and the condensation section 12. The battery cell 4 can exchange heat with the evaporation section 11 at the periphery of the battery cell 4, and the evaporation section 11 can exchange heat with the heat transfer liquid in the tube body of the heat pipe 1.

[0044] See also Figure 1-4 The liquid cooling device 2 is provided with a flow channel 21, which is arranged along the condensing section 12, and the flow channel 21 is in physical contact with the condensing section 12. There is a refrigerant in the flow channel 21, and the refrigerant can flow in the flow channel 21. At least a part or the whole of the condensing section 12 is in the flow channel 21, and the condensing section 12 can contact the refrigerant in the flow channel 21, so that the refrigerant can directly exchange heat with the condensing section 12 of the heat pipe 1. In order to ensure that the refrigerant in the flow channel 21 will not leak from the connection between the shell 24 of the liquid cooling device 2 and the heat pipe 1, the connection between the shell 24 of the liquid cooling device 2 and the heat pipe 1 can be filled with a sealing ring or a sealant. The two ends of the flow channel 21 are respectively a liquid inlet 22 and a liquid outlet 23, and the thermal management module 3 is respectively connected to the liquid inlet 22 and the liquid outlet 23 so that the refrigerant circulates in the flow channel 21 and the thermal management module 3. The refrigerant can flow between the flow channel 21 and the thermal management module 3 through the liquid inlet 22, and can also flow between the flow channel 21 and the thermal management module 3 through the liquid outlet 23.

[0045] See also Figure 4 and 5 The liquid cooling device 2 includes a housing 24 and a flow channel 21. The flow channel 21 includes at least one infusion channel 211 and a connecting channel 212. The infusion channel 211 extends in a winding manner, and two adjacent infusion channels 211 are connected end to end through the connecting channel 212. An infusion channel 211 located at the outermost side of the liquid cooling device 2 is provided with a liquid inlet 22. Correspondingly, an infusion channel 211 located at the other outermost side of the liquid cooling device 2 is provided with a liquid outlet 23. The refrigerant can flow from one infusion channel 211 to the other infusion channel 211 through the connecting channel 212, and at least a part or the whole of the condensing section 12 is in the infusion channel 211.

[0046] See also Figure 1-4When cooling the battery cell 4, the heat generated by the battery cell 4 can be transferred to the evaporation section 11 on the periphery of the battery cell 4, and then transferred from the evaporation section 11 to the heat transfer fluid in the tube body of the heat pipe 1; the heat transfer occurs in the heat transfer fluid in the heat pipe 1, so that the heat transfer fluid in the evaporation section 11 will be vaporized after absorbing heat, and the volume of the gas changed by the heat transfer fluid will expand, and then flow to the condensation section 12 with heat, and after the gas changed by the heat transfer fluid reaches the condensation section 12, the heat is transferred to the refrigerant through the condensation section 12, and the temperature of the gas changed by the heat transfer fluid decreases and liquefies into liquid heat transfer fluid, and the liquid heat transfer fluid then flows back from the condensation section 12 to the evaporation section 11, thereby circulating between the evaporation section 11 and the condensation section 12; and the refrigerant absorbs heat and flows along the flow channel 21, flows into the thermal management module 3 through the liquid outlet 23, and the thermal management module 3 discharges the heat of the refrigerant to cool the refrigerant, and the cooled refrigerant flows back to the flow channel 21 of the liquid cooling device 2 through the liquid inlet 22.

[0047] See also Figure 1 , Figure 2 and Figure 4 When the battery cell 4 needs to be heated, the thermal management module 3 heats the refrigerant in the thermal management module 3 so that the temperature of the refrigerant rises and is higher than the temperature of the battery; the heated refrigerant flows into the flow channel 21 from the thermal management module 3, and when the heated refrigerant passes through the condensing section 12, the heat is transferred to the condensing section 12, and the heat is then transferred from the condensing section 12 to the heat transfer fluid in the condensing section 12, the temperature of the heat transfer fluid rises and vaporizes, the volume of the gas changed by the heat transfer fluid expands, and then flows to the evaporation section 11 with the heat; after the gas changed by the heat transfer fluid reaches the evaporation section 11, the heat is transferred to the battery through the evaporation section 11, the temperature of the battery cell 4 rises, the temperature of the gas changed by the heat transfer fluid drops and liquefies into liquid heat transfer fluid, and the heat transfer fluid then flows back from the evaporation section 11 to the condensing section 12, thereby circulating between the evaporation section 11 and the condensation section 12.

[0048] See also Figure 1-5As can be seen from this example, the battery thermal management system of the present application can arrange the flow channel 21 along the condensing section 12 and make the flow channel 21 in physical contact with the condensing section 12, so that the refrigerant flowing in the flow channel 21 can fully contact with the condensing section 12, thereby improving the heat exchange efficiency between the condensing section 12 and the refrigerant, and the evaporation section 11 is arranged on the periphery of the battery cell 4, so that the evaporation section 11 and the battery cell 4 are heat-conducted; in the cooling mode, the heat-conducting liquid in the evaporation section 11 can absorb the heat of the battery cell 4 and then vaporize and move to the cooling The heat pipe 1 flows through the condensing section 12, so that the refrigerant quickly cools the vaporized heat transfer liquid, thereby cooling the battery cell 4. Due to the high thermal conductivity of the heat pipe 1, the heat pipe 1 can quickly conduct the heat of the battery cell 4 to prevent the temperature of the battery cell 4 from accumulating or being too high. In the heating mode, when the refrigerant in the high temperature state flows through the condensing section 12, the heat transfer liquid in the condensing section 12 can absorb the heat of the refrigerant and vaporize. The vaporized heat transfer liquid flows to the evaporating section 11 and is transferred to the battery cell 4 around the evaporating section 11 through heat, thereby heating the battery. The heat pipe 1 is directly inserted into the liquid cooling device 2 with the flow channel 21. The flow guide design of the flow channel 21 can enhance heat exchange. At the same time, the liquid cooling device 2 is directly connected to the thermal management module 3, and uses the refrigerant to directly cool or heat, which can quickly respond to temperature changes and provide immediate heat exchange effects. It is suitable for high-power, high-heat, and large-capacity application scenarios. Through the high thermal conductivity of the heat pipe 1, not only can the battery cell 4 be quickly cooled under high temperature or charging and discharging, but the battery cell 4 can also be quickly heated at low temperature, ensuring that the battery cell 4 operates within the optimal temperature range, achieving rapid heating or cooling of the battery cell 4, and high heat exchange efficiency.

[0049] See also Figure 2 and Figure 4 In some embodiments, a plurality of heat exchange fins 121 are disposed on the outer peripheral wall of the condensing section 12. The heat exchange fins 121 are radially inserted into the flow channel 21. The heat exchange fins 121 are immersed in the refrigerant. The heat exchange fins 121 can increase the contact area between the condensing section 12 and the refrigerant, thereby improving the heat exchange efficiency between the condensing section 12 and the refrigerant. The heat exchange fins 121 are integrally formed with the outer shell of the heat pipe 1. The heat exchange fins 121 can also be fixed to the outer shell of the heat pipe 1 by welding, or by assembly.

[0050] See also Figure 2 and Figure 4 In some embodiments, the evaporation section 11 is provided with a heat conducting medium 111, and the heat conducting medium 111 is arranged on the outer peripheral wall between the heat pipe 1 and the battery cell 4. The heat conducting medium 111 can improve the heat conduction efficiency between the heat pipe 1 and the battery cell 4, so that the heat of the battery cell 4 can be more easily transferred to the evaporation section 11, or the heat of the evaporation section 11 can be more easily transferred to the battery cell 4.

[0051] See also Figure 2and Figure 4 Further, in some embodiments, the heat-conducting medium 111 includes a heat-conducting adhesive, which is applied to the outer peripheral wall of the evaporation section 11 or the battery cell 4. The battery cell 4 conducts heat with the evaporation section 11 through the heat-conducting adhesive. The heat-conducting adhesive can increase the thermal conductivity of the battery cell 4 and the evaporation section 11. The heat-conducting adhesive can fill the gap between the battery cell 4 and the evaporation section 11, thereby making it easier for the battery cell 4 and the evaporation section 11 to conduct heat. In some embodiments, the heat-conducting medium 111 includes a heat-conducting sheet, which is attached to the outer peripheral wall of the battery cell 4 or the evaporation section 11. The battery cell 4 conducts heat with the evaporation section 11 through the heat-conducting sheet. The heat-conducting sheet can be a graphite sheet or other high thermal conductivity sheet. By setting the heat-conducting sheet with a high thermal conductivity coefficient on the evaporation section 11 or the battery cell 4, the thermal conductivity efficiency of the battery cell 4 and the evaporation section 11 can be improved. In some embodiments, the heat conductive medium 111 includes a thermally conductive adhesive and a thermally conductive sheet. The thermally conductive sheet is adhered to the outer peripheral wall of the battery cell 4 or the evaporation section 11, and the thermally conductive adhesive is coated on the outer peripheral wall of the evaporation section 11 or the battery cell 4. By cooperating with the thermally conductive adhesive and the thermally conductive sheet, the thermally conductive adhesive can fill the gap between the battery cell 4 and the thermally conductive sheet. By using a medium with a high thermal conductivity coefficient as a heat conductor for the evaporation section 11 or the battery cell 4, the thermal conductivity efficiency of the battery cell 4 and the evaporation section 11 can be greatly improved.

[0052] See also Figure 1 and Figure 4 In some embodiments, the thermal management module 3 includes a heat exchanger 31, a compressor 32, a reversing valve 33, and an expansion valve 34 connected in sequence through a pipeline. The heat exchanger 31 is also connected to the liquid inlet 22 and the liquid outlet 23 of the flow channel 21, respectively. The refrigerant in the flow channel 21 can enter the heat exchanger 31 from the flow channel 21 through the liquid outlet 23, and then return to the flow channel 21 from the heat exchanger 31 through the liquid inlet 22. The pipeline connecting the heat exchanger 31, the compressor 32, the reversing valve 33, and the expansion valve 34 also has refrigerant, and the refrigerant circulates in the heat exchanger 31, the compressor 32, the reversing valve 33, and the expansion valve 34. The refrigerant can circulate in the heat exchanger 31, the compressor 32, the reversing valve 33, and the expansion valve 34 according to the flow direction corresponding to the preset mode, wherein the thermal management module 3 can change the direction of the refrigerant through the reversing valve 33, thereby determining whether the thermal management module 3 is in the cooling mode or the heating mode. The thermal management module 3 has a bidirectional adjustment function, which can cool or heat the battery cell 4 according to the temperature sensing requirements of the battery cell 4. Combined with the high thermal conductivity of the heat pipe 1, it can not only quickly cool the battery cell 4 under high temperature or charging and discharging, but also quickly heat the battery cell 4 at low temperature, ensuring that the battery cell 4 operates within the optimal temperature range.

[0053] See also Figure 1 and Figure 3When the preset mode is the cooling mode, the reversing valve 33 changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger 31, the compressor 32, the reversing valve 33 and the expansion valve 34 in sequence; in the cycle of the heat exchanger 31, the compressor 32, the reversing valve 33 and the expansion valve 34, the heat exchanger 31 is equivalent to an evaporator, and the refrigerant evaporates through the heat exchanger 31, is compressed by the compressor 32, is condensed by the heat exchanger 5, and is expanded by the expansion valve 34 before reaching the heat exchanger 31, and the heat exchanger 31 plays a role in absorbing heat; the heat generated by the battery is transferred to the condensing section 12 through the evaporating section 11, and the refrigerant in the flow channel 21 that absorbs the heat of the condensing section 12 transfers the heat to the heat exchanger 31 when it flows through the heat exchanger 31; the heat exchanger absorbs the heat of the refrigerant from the flow channel 21, so that the battery is cooled down.

[0054] See also Figure 1 and Figure 3 When the preset mode is the heating mode, the reversing valve 33 changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger 31, the expansion valve 34, the reversing valve 33 and the compressor 32 in sequence. In the cycle of the heat exchanger 31, the expansion valve 34, the reversing valve 33 and the compressor 32, the heat exchanger 31 is equivalent to a condenser. After releasing heat, the refrigerant condenses through the heat exchanger 31, expands through the expansion valve 34, evaporates through the heat exchanger 5, and is compressed by the compressor 32 before reaching the heat exchanger 31. The heat exchanger 31 plays a heating role; in the cycle of the heat exchanger 31 and the flow channel 21, the heat exchanger 31 heats the refrigerant passing through the heat exchanger 31, so that the liquid refrigerant becomes a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the flow channel 21 and releases heat in the condensation section 12. The refrigerant transfers the heat from the condensation section 12 to the evaporation section 11, and the evaporation section 11 then transfers the heat to the battery cell 4, thereby increasing the temperature of the battery cell 4.

[0055] See also Figure 1 and Figure 4 , through the thermal management module 3, the refrigerant is made to flow in the flow channel 21, which can efficiently realize the cooling and heating functions of the battery cell 4. Among them, the heat exchanger 5 can be used as a condenser or as an evaporator, and the heat exchanger 5 is usually installed on the vehicle. In some embodiments, the refrigerant and the thermal fluid can be the same substance. Such a design has lower costs. The liquid cooling of traditional battery packs generally uses water-ethylene glycol as the heat exchange medium. When cooling is required, heat exchange is completed through the heat exchanger and the refrigeration system. When heating is required, the battery pack is heated by the heating element. However, in the present application, the refrigerant is used as the heat exchange medium, and the thermal management module 3 is used to directly complete the cooling and heating, which has lower costs, higher system integration, and more compact space.

[0056] See also Figure 2 and Figure 4In some embodiments, the number of heat pipes 1 is multiple, each evaporation section 11 is connected to at least one condensation section 12, each evaporation section 11 is respectively attached to the periphery of multiple battery cells 4 and arranged in a conformal manner, the condensation section 12 extends into the flow channel 21, and the flow channel 21 extends along the distribution direction of the condensation section 12.

[0057] In some embodiments, the number of heat pipes 1 is one, and the heat pipe 1 includes an evaporation section 11 and multiple condensation sections 12. The evaporation sections 11 of a single heat pipe 1 are respectively attached to the peripheries of multiple battery cells 4 and are arranged in a conformal manner. The evaporation sections 11 pass through the peripheries of all battery cells 4. The evaporation sections 11 are respectively connected to the multiple condensation sections 12. The multiple condensation sections 12 extend into the flow channel 21, and the flow channel 21 extends along the distribution direction of the condensation sections 12.

[0058] See also Figure 2 and Figure 4 In some embodiments, the evaporation section 11 of the heat pipe 1 extends in a wave shape, and the wave-shaped extended evaporation section 11 can better fit the outer periphery of the cylindrical battery cell 4, thereby increasing the contact area between the evaporation section 11 and the battery cell 4 and improving the heat exchange efficiency between the evaporation section 11 and the battery cell 4.

[0059] In some embodiments, the evaporation section 11 of the heat pipe 1 extends in a straight line. The evaporation section 11 extending in a straight line can better fit the outer periphery of the square shell-shaped battery cell 4, thereby increasing the contact area between the evaporation section 11 and the battery cell 4 and improving the heat exchange efficiency between the evaporation section 11 and the battery cell 4.

[0060] See also Figure 2-4 In some embodiments, the heat pipe 1 includes a plurality of evaporation sections 11 and a condensation section 12, and the condensation sections 12 are respectively connected to the plurality of evaporation sections 11. The plurality of evaporation sections 11 facilitate heat conduction with a large number of battery cells 4, and the condensation sections 12 are respectively connected to the plurality of evaporation sections 11. The condensation sections 12 can extend along the flow channel 21, thereby increasing the contact area between the refrigerant and the condensation section 12.

[0061] See also Figure 2 and Figure 4In some embodiments, the heat pipe 1 further includes an insulating section 13, which is disposed between the evaporation section 11 and the condensation section 12. The insulating section 13 is connected to the evaporation section 11 and the condensation section 12, respectively. The heat-conducting liquid can flow from the evaporation section 11 to the condensation section 12 through the insulating section 13, and the heat-conducting liquid can also flow from the condensation section 12 to the evaporation section 11 through the insulating section 13. The insulating section 13 is made of a material with a low thermal conductivity coefficient. When the heat-conducting liquid passes through the insulating section 13, the insulating section 13 can reduce the heat transfer between the heat-conducting liquid and the outside. When cooling the battery, it is prevented that the vaporized heat-conducting liquid discharges a large amount of heat outside the heat pipe 1 when passing through the insulating section 13, thereby causing the ambient temperature around the battery cell 4 to rise; when heating the battery, it is prevented that the vaporized heat-conducting liquid discharges a large amount of heat outside the heat pipe 1 when passing through the insulating section 13, resulting in a poor heating effect on the battery.

[0062] See also Figure 1-5 An embodiment of the present application further provides a vehicle, which includes a battery thermal management system according to any of the above embodiments. The battery cell 4 is installed in the vehicle, and the vehicle is provided with a heat exchanger 5, which is respectively connected to the expansion valve 34 and the reversing valve 33. The heat exchanger 5 can be used as a condenser or an evaporator to heat or cool the refrigerant passing through the heat exchanger 5.

[0063] The vehicle of the present application may be a new energy vehicle. By setting up the battery thermal management system of the present application and extending the condensing section 12 into the flow channel 21, the heat-conducting liquid in the condensing section 12 can efficiently exchange heat with the refrigerant, thereby improving the heat exchange efficiency between the heat pipe 1 and the liquid cooling device 2. The battery thermal management system has excellent cooling and heating functions, and can meet the temperature requirements of the battery cell 4 during normal operation.

[0064] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0065] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery thermal management system, characterized in that: Including heat pipes, liquid cooling devices, and thermal management modules; The heat pipe comprises an evaporation section and a condensation section which are connected to each other. The evaporation section is used to be arranged at the periphery of the battery cell. The heat pipe body has a heat transfer liquid in it to exchange heat with the battery cell. The liquid cooling device is provided with a flow channel, in which a refrigerant is arranged along the condensing section and in physical contact with the condensing section to exchange heat with the condensing section of the heat pipe; the two ends of the flow channel are respectively a liquid inlet and a liquid outlet; The thermal management module is communicated with the liquid inlet and the liquid outlet respectively, so that the refrigerant circulates in the flow channel and the thermal management module, and heats or cools the refrigerant to increase or decrease the temperature of the battery cell.

2. The battery thermal management system according to claim 1, characterized in that: A plurality of heat exchange fins are arranged on the outer peripheral wall of the condensation section, and the heat exchange fins are inserted into the flow channel.

3. The battery thermal management system according to claim 1 or 2, characterized in that: The evaporation section is provided with a heat-conducting medium, and the heat-conducting medium is arranged on the outer peripheral wall between the heat pipe and the battery cell.

4. The battery thermal management system according to claim 3, characterized in that: The heat-conducting medium includes heat-conducting glue and / or heat-conducting sheet, and the heat-conducting sheet is attached to the outer peripheral wall of the battery cell or the evaporation section. Correspondingly, the heat-conducting glue is coated on the outer peripheral wall of the evaporation section or the battery cell.

5. The battery thermal management system according to claim 1, characterized in that: The thermal management module comprises a heat exchanger, a compressor, a reversing valve and an expansion valve which are sequentially connected through a pipeline, wherein the heat exchanger is respectively connected to a liquid inlet and a liquid outlet of the flow channel, so that the refrigerant circulates in the heat exchanger, the compressor, the reversing valve and the expansion valve according to a flow direction corresponding to a preset mode; When the preset mode is the cooling mode, the reversing valve changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger, the compressor, the reversing valve, and the expansion valve in sequence; When the preset mode is the heating mode, the reversing valve changes the flow direction of the refrigerant so that the refrigerant circulates along the heat exchanger, the expansion valve, the reversing valve and the compressor in sequence.

6. The battery thermal management system according to claim 1, characterized in that: The number of the heat pipes is one or more; The evaporation section of a single heat pipe is respectively attached to the outer circumference of a plurality of battery cells and arranged in a conformal manner.

7. The battery thermal management system according to claim 6, characterized in that: The evaporation section of the heat pipe extends in a wave shape to fit the outer circumference of the cylindrical battery cell; The evaporation section of the heat pipe extends in a straight line to fit the outer circumference of the square shell-shaped battery cell.

8. The battery thermal management system according to claim 6, characterized in that: The heat pipe includes a plurality of evaporation sections and one condensation section, and the condensation sections are respectively connected to the plurality of evaporation sections.

9. The battery thermal management system according to claim 1, characterized in that: The heat pipe further comprises an insulating section, which is arranged between the evaporation section and the condensation section.

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

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