Battery thermal management system, battery pack and vehicle

Abstract

The utility model relates to a battery thermal management system, a battery pack and a vehicle. The battery heat management system comprises a first heat exchange assembly and a second heat exchange assembly, the first heat exchange assembly is connected to a battery pack body and used for exchanging heat with the battery pack body so that the temperature of the battery pack body can be reduced, and the second heat exchange assembly is connected to the battery pack body and used for exchanging heat with the battery pack body so that the temperature of the battery pack body can be reduced. And the temperature of the battery pack body can be increased. According to the battery thermal management system provided by the embodiment of the invention, the functions of the battery thermal management system are increased, so that the battery thermal management system can meet the temperature requirements of the battery pack under different environmental conditions, and the battery pack can be in a proper temperature range under different environmental conditions.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of new energy vehicles, energy storage systems and other fields, the performance and life of the battery pack have become a key technical bottleneck. The working temperature of the battery directly affects its charging and discharging efficiency, capacity decay rate and safety.

[0003] In order to make the battery pack in an ideal working temperature, the temperature of the battery pack needs to be controlled by using a battery thermal management system. However, the battery thermal management system in the related art is difficult to meet the temperature control requirements of the battery pack under different environmental conditions. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a battery thermal management system, which increases the function of the battery thermal management system, so that the battery thermal management system can meet the temperature requirements of the battery pack under different environmental conditions, so that the battery pack can be in a suitable temperature range under different environmental conditions, to at least partially solve the above technical problems.

[0005] In order to achieve the above purpose, according to the first aspect of the present application, a battery thermal management system is provided, comprising:

[0006] A first heat exchange assembly is connected to the battery pack body, and the first heat exchange assembly is used for heat exchange with the battery pack body, so that the temperature of the battery pack body can be reduced;

[0007] A second heat exchange assembly is connected to the battery pack body, and the second heat exchange assembly is used for heat exchange with the battery pack body, so that the temperature of the battery pack body can be increased.

[0008] Optionally, the second heat exchange assembly comprises a heat exchange member connected with the battery pack body, and the heat exchange member is used for heat exchange with the battery pack body to increase the temperature of the battery pack body.

[0009] Optionally, the second heat exchange assembly further comprises a heating member connected with the heat exchange member, and the heating member is used for heating the heat exchange member.

[0010] Optionally, the second heat exchange assembly is formed with a second heat exchange pipeline, the second heat exchange pipeline connects the heating member and the heat exchange member, and the second heat exchange pipeline is used for storing a heat exchange medium.

[0011] Optionally, the second heat exchange assembly further comprises a driving pump connected to the second heat exchange pipeline, and the driving pump is used to drive the heat exchange medium in the second heat exchange pipeline to flow; and / or,

[0012] The second heat exchange assembly further comprises a flow valve connected to the second heat exchange pipeline.

[0013] Optionally, the second heat exchange assembly further comprises a second temperature sensor configured to detect the temperature of the heat exchange medium flowing into the heat exchange component.

[0014] Optionally, the battery pack body comprises at least two battery cells, wherein,

[0015] Each of the at least two battery cells is connected to the first heat exchange assembly; and / or,

[0016] Each of the at least two battery cells is connected to the second heat exchange assembly.

[0017] Optionally, the battery pack body comprises at least two battery cells, wherein,

[0018] The number of the first heat exchange assemblies is at least two, the at least two battery cells and the at least two first heat exchange assemblies are one-to-one connected, and the at least two first heat exchange assemblies are connected to each other so that the at least two first heat exchange assemblies can exchange heat with each other; and / or,

[0019] The number of the second heat exchange assemblies is at least two, the at least two battery cells and the at least two second heat exchange assemblies are one-to-one connected, and the at least two second heat exchange assemblies are connected to each other so that the at least two second heat exchange assemblies can exchange heat with each other.

[0020] According to a second aspect of the present application, a battery pack is provided, comprising the battery thermal management system as described above.

[0021] Optionally, at least one of the first heat exchange assembly and the second heat exchange assembly is arranged in an internal space of the battery pack.

[0022] Optionally, the battery pack body comprises a tray and a battery cell, the tray is formed with a mounting cavity, and the battery cell is mounted in the mounting cavity.

[0023] Optionally, the first heat exchange assembly is connected to the tray, the first heat exchange assembly is formed with a first heat exchange pipeline, the tray is formed with a heat exchange flow channel, and the heat exchange flow channel is configured to communicate the first heat exchange pipeline and a refrigeration system.

[0024] Optionally, an inlet of the heat exchange flow channel is formed on a side wall surface of the tray, and an outlet of the heat exchange flow channel is in communication with the first heat exchange pipeline.

[0025] Optionally, the second heat exchange assembly is integrated in the tray.

[0026] Optionally, the second heat exchange assembly has a second heat exchange pipeline, the second heat exchange pipeline comprises a pipeline body and a connecting flow path, the connecting flow path is in communication with an outlet of the pipeline body and an inlet of the pipeline body.

[0027] Optionally, the connecting flow path comprises a first connecting pipeline, a second connecting pipeline and a third connecting pipeline in sequence, the outlet of the pipeline body, the first connecting pipeline, the second connecting pipeline, the third connecting pipeline and the inlet of the pipeline body are in communication in sequence.

[0028] Optionally, the second heat exchange assembly is arranged at a bottom wall of the tray, the first connecting pipeline is formed at a first side wall of the tray, and the third connecting pipeline is formed at a second side wall of the tray.

[0029] Optionally, the battery pack comprises at least two second heat exchange assemblies, wherein,

[0030] The first connecting pipeline comprises a first main pipeline and at least two first branch pipelines, the at least two first branch pipelines correspond to the pipeline bodies of the at least two second heat exchange assemblies in one-to-one correspondence, and the outlet of the pipeline body, the first branch pipeline, the first main pipeline and the second connecting pipeline are in communication in sequence; and / or,

[0031] The third connecting pipeline comprises a second main pipeline and at least two second branch pipelines, the at least two second branch pipelines correspond to the pipeline bodies of the at least two second heat exchange assemblies in one-to-one correspondence, and the second connecting pipeline, the second main pipeline, the second branch pipeline and the inlet of the pipeline body are in communication in sequence.

[0032] According to a third aspect of the present application, a vehicle is provided, comprising the battery pack as described above.

[0033] Optionally, the vehicle further comprises a cooling circuit, the cooling circuit is used for cooling a heat generating component of the vehicle, and the cooling circuit is connected with the second heat exchange pipeline of the second heat exchange assembly, so that the cooling circuit can heat the second heat exchange assembly.

[0034] Optionally, the vehicle further comprises an air conditioning system, the air conditioning system is connected with the first heat exchange assembly, and the air conditioning system is used for heat exchange with the first heat exchange assembly.

[0035] In the battery thermal management system, the first heat exchange assembly and the second heat exchange assembly are integrated in the battery thermal management system, so that the battery thermal management system can use the first heat exchange assembly to cool the battery pack body to reduce the temperature of the battery pack body, and can use the second heat exchange assembly to heat the battery pack body to increase the temperature of the battery pack body. That is, the application increases the function of the battery thermal management system, so that the battery thermal management system can meet the temperature requirements of the battery pack under different environmental conditions, so that the battery pack can be in a suitable temperature range under different environmental conditions.

[0036] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0038] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0039] Figure 1 is a structural schematic diagram of a battery thermal management system provided in an exemplary embodiment of the present disclosure;

[0040] Figure 2 is a structural exploded schematic diagram of a battery thermal management system provided in an exemplary embodiment of the present disclosure;

[0041] Figure 3 is a partial structural schematic diagram of a battery thermal management system provided in an exemplary embodiment of the present disclosure;

[0042] Figure 4 is a structural schematic diagram of a tray provided in an exemplary embodiment of the present disclosure;

[0043] Figure 5 is a sectional view of a battery thermal management system provided in an exemplary embodiment of the present disclosure;

[0044] Figure 6 is one of the internal structural schematic diagrams of a tray provided in an exemplary embodiment of the present disclosure;

[0045] Figure 7 is another of the internal structural schematic diagrams of a tray provided in an exemplary embodiment of the present disclosure;

[0046] Figure 8 is provided in the exemplary embodiments of the present disclosure Figure 7 is a cross-sectional view of A-A in

[0047] Figure 9 is provided in the exemplary embodiments of the present disclosure Figure 7 is a cross-sectional view of B-B in

[0048] Figure 10 is provided in the exemplary embodiments of the present disclosure Figure 7 is a cross-sectional view of C-C in

[0049] Figure 11 is provided in the exemplary embodiments of the present disclosure Figure 10 is an enlarged schematic view of the structure at A in

[0050] Legend of reference signs:

[0051] 1, first heat exchange assembly; 2, battery pack body; 3, second heat exchange assembly; 4, cooling loop; 5, air conditioning system; 21, battery cell; 22, tray; 221, mounting cavity; 222, heat exchange flow channel; 223, first side wall; 224, second side wall; 31, heat exchange member; 32, heating member; 33, second heat exchange pipeline; 34, driving pump; 35, flow valve; 36, second temperature sensor; 321, heating member; 322, fin; 331, pipeline body; 332, connecting flow channel; 333, first connecting pipeline; 334, second connecting pipeline; 335, third connecting pipeline; 3331, first main pipeline; 3332, first branch pipeline; 3351, second main pipeline; 3352, second branch pipeline. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0053] According to a first aspect of the present application, referring to Figures 1 to 11 , the present application provides a battery thermal management system.

[0054] Referring to Figure 1 , the battery thermal management system comprises a first heat exchange assembly 1 and a second heat exchange assembly 3, the first heat exchange assembly 1 is connected to a battery pack body 2, the first heat exchange assembly 1 is used for heat exchange with the battery pack body 2, so that the temperature of the battery pack body 2 can be reduced, the second heat exchange assembly 3 is connected to the battery pack body 2, the second heat exchange assembly 3 is used for heat exchange with the battery pack body 2, so that the temperature of the battery pack body 2 can be increased.

[0055] It can be understood that by simultaneously integrating the first heat exchange assembly 1 and the second heat exchange assembly 3 in the battery thermal management system, the battery thermal management system can not only cool the battery pack body 2 by using the first heat exchange assembly 1 to reduce the temperature of the battery pack body 2, but also heat the battery pack body 2 by using the second heat exchange assembly 3 to increase the temperature of the battery pack body 2. That is, the application increases the function of the battery thermal management system, so that the battery thermal management system can meet the temperature requirements of the battery pack under different environmental conditions, so that the battery pack can be in a suitable temperature range under different environmental conditions.

[0056] In some examples, when the environmental temperature is lower than the standard working temperature range of the battery pack, the battery thermal management system can heat the battery pack body 2 by using the second heat exchange assembly 3 to increase the temperature of the battery pack body 2, so that the temperature of the battery pack is within the standard working temperature range, reducing the influence of the environmental temperature on the battery pack. When the environmental temperature is higher than the standard working temperature range of the battery pack, the battery thermal management system can cool the battery pack body 2 by using the first heat exchange assembly 1 to reduce the temperature of the battery pack body 2, so that the temperature of the battery pack is within the standard working temperature range, reducing the influence of the environmental temperature on the battery pack.

[0057] In some embodiments, referring to Figure 1 The second heat exchange assembly 3 includes a heat exchange piece 31 connected to the battery pack body 2, and the heat exchange piece 31 is used for heat exchange with the battery pack body 2 to increase the temperature of the battery pack body 2.

[0058] It can be understood that by heat exchange between the heat exchange piece 31 and the battery pack body 2 to increase the temperature of the battery pack body 2, the temperature of the battery pack body 2 can be adjusted, so that the battery pack body 2 can be in the standard working temperature range under low temperature environmental conditions.

[0059] Specifically, the heat exchange piece 31 includes a liquid heat plate connected to the battery pack body 2, and the liquid heat plate is used for heating the battery pack body 2.

[0060] In some embodiments, the first heat exchange assembly 1 includes a direct cooling plate connected to the battery pack body 2, and the direct cooling plate is used for cooling the battery pack body 2.

[0061] In some embodiments, referring to Figure 1 The second heat exchange assembly 3 further includes a heating piece 32 connected to the heat exchange piece 31, and the heating piece 32 is used for heating the heat exchange piece 31.

[0062] It can be understood that the heating member 32 can heat the heat exchange member 31 to increase the temperature of the heat exchange member 31, and then the heat exchange member 31 exchanges heat with the battery pack body 2 to increase the temperature of the battery pack body 2, thereby achieving temperature regulation of the battery pack body 2.

[0063] For example, the heating member 32 can be a heater or a heating belt or any other suitable component with a heating function.

[0064] In some examples, the heating member 32 can be in direct contact with the heat exchange member 31 to achieve heat transfer.

[0065] Specifically, referring to Figure 1 The second heat exchange assembly 3 is formed with a second heat exchange pipeline 33, the second heat exchange pipeline 33 connects the heating member 32 and the heat exchange member 31, and the second heat exchange pipeline 33 is used to store heat exchange medium, so that the heating member 32 can transfer heat to the heat exchange member 31 through the second heat exchange pipeline 33.

[0066] In some embodiments, referring to Figure 1 The second heat exchange assembly 3 further comprises a driving pump 34 connected to the second heat exchange pipeline 33, and the driving pump 34 is used to drive the heat exchange medium in the second heat exchange pipeline 33 to flow.

[0067] It can be understood that the driving pump 34 can drive the heat exchange medium in the second heat exchange pipeline 33 to flow, so that the heat exchange medium can flow between the heating member 32 and the heat exchange member 31 to achieve heat exchange between the heating member 32 and the heat exchange member 31.

[0068] It can be understood that the heating member 32 can be turned off so that the heating member 32 does not heat the heat exchange medium, and the driving pump 34 can be turned on so that the driving pump 34 can drive the heat exchange medium to flow, so that the second heat exchange pipeline 33 can uniform the temperature of the battery pack body 2 and improve the temperature uniformity of the battery pack body 2.

[0069] In some embodiments, referring to Figure 1 The second heat exchange assembly 3 further comprises a flow valve 35 connected to the second heat exchange pipeline 33.

[0070] It can be understood that the flow valve 35 can be used to adjust the flow rate of the heat exchange medium in the second heat exchange pipeline 33.

[0071] In some embodiments, referring to Figure 1 The second heat exchange assembly 3 further comprises a second temperature sensor 36 for detecting the temperature of the heat exchange medium flowing into the heat exchange member 31.

[0072] It can be understood that the temperature of the heat exchange medium flowing into the heat exchange element 31 can be detected by the second temperature sensor 36, and then the temperature of the heat exchange element 31 can be determined, and further the temperature range to which the heat exchange element 31 can heat the battery pack body 2 can be determined. That is, through the second temperature sensor 36, it can be judged whether the temperature of the heat exchange medium is in the preset range, so as to avoid that the temperature of the heat exchange medium is too high or too low, and ensure that the heat exchange element 31 can heat the battery pack body 2 to the standard working temperature, and will not cause the temperature of the battery pack body 2 to be too high or too low.

[0073] For example, the second temperature sensor 36 is arranged at the inlet of the heat exchange element 31.

[0074] In some examples, the second heat exchange assembly 3 further comprises a third temperature sensor, the third temperature sensor is arranged in the heating element 32, and the third temperature sensor can detect the temperature in the heating element 32.

[0075] In some examples, the second heat exchange assembly 3 further comprises a management controller, the management controller is used to control the working of the heating element 32 and / or the pump 34.

[0076] In some embodiments, the battery pack body 2 comprises at least two battery cells 21.

[0077] Specifically, the at least two battery cells 21 are connected with the first heat exchange assembly 1.

[0078] It can be understood that the at least two battery cells 21 are connected with the first heat exchange assembly 1 at the same time, and then the first heat exchange assembly 1 can simultaneously exchange heat with the at least two battery cells 21, so that the temperature of the at least two battery cells 21 is close to or even the same, and the temperature uniformity of the battery pack body 2 is improved.

[0079] Specifically, the at least two battery cells 21 are connected with the second heat exchange assembly 3.

[0080] It can be understood that the at least two battery cells 21 are connected with the second heat exchange assembly 3 at the same time, and then the second heat exchange assembly 3 can simultaneously exchange heat with the at least two battery cells 21, so that the temperature of the at least two battery cells 21 is close to or even the same, and the temperature uniformity of the battery pack body 2 is improved.

[0081] In some embodiments, the battery pack body 2 comprises at least two battery cells 21.

[0082] Specifically, the number of the first heat exchange assemblies 1 is at least two, the at least two battery cells 21 and the at least two first heat exchange assemblies 1 are connected one by one, and the at least two first heat exchange assemblies 1 are connected with each other, so that the at least two first heat exchange assemblies 1 can exchange heat with each other.

[0083] It is understandable that different first heat exchange components 1 are connected to different cells 21, and different first heat exchange components 1 are connected to each other, so different first heat exchange components 1 can exchange heat with each other, and different cells 21 can exchange heat through the first heat exchange components 1, which helps to reduce the temperature difference between different cells 21 and improve the temperature uniformity of the battery pack body 2.

[0084] Specifically, there are at least two second heat exchange components 3, with at least two battery cells 21 and at least two second heat exchange components 3 connected in a one-to-one correspondence, and at least two second heat exchange components 3 connected to each other so that at least two second heat exchange components 3 can exchange heat with each other.

[0085] It is understandable that different second heat exchange components 3 are connected to different cells 21, and different second heat exchange components 3 are connected to each other, so different second heat exchange components 3 can exchange heat with each other, and different cells 21 can exchange heat through the second heat exchange components 3, which helps to reduce the temperature difference between different cells 21 and improve the temperature uniformity of the battery pack body 2.

[0086] According to a second aspect of this application, this application provides a battery pack including the aforementioned battery thermal management system.

[0087] It is understandable that by integrating the first heat exchange component 1 and the second heat exchange component 3 into the battery thermal management system, the system can both cool the battery pack body 2 using the first heat exchange component 1 to lower its temperature and heat the battery pack body 2 using the second heat exchange component 3 to raise its temperature. In other words, this application enhances the functionality of the battery thermal management system, enabling it to meet the battery pack temperature requirements under different environmental conditions, ensuring the battery pack remains within a suitable temperature range under varying circumstances.

[0088] In some embodiments, at least one of the first heat exchange component 1 and the second heat exchange component 3 is disposed within the internal space of the battery pack.

[0089] It is understandable that placing the first heat exchange component 1 and / or the second heat exchange component 3 within the internal space of the battery pack enables the utilization of the internal space of the battery pack. At the same time, it allows the first heat exchange component 1 and / or the second heat exchange component 3 to directly exchange heat with the battery cells 21 inside the battery pack, thereby improving the heat exchange effect.

[0090] In some embodiments, see Figure 2 The battery pack body 2 includes a tray 22 and a battery cell 21. The tray 22 has a mounting cavity 221, and the battery cell 21 is installed in the mounting cavity 221.

[0091] It can be understood that the tray 22 can be used to carry the battery cell 21, and the battery cell 21 is installed in the installation cavity 221, so as to realize effective utilization of the space of the tray 22, and the installation cavity 221 can limit the battery cell 21, so as to ensure the installation stability of the battery cell 21.

[0092] Specifically, referring to Figure 2 , Figure 3 and Figure 4 , the first heat exchange assembly 1 is connected to the tray 22, the first heat exchange assembly 1 is formed with a first heat exchange pipeline 11, and the tray 22 is formed with a heat exchange flow channel 222, and the heat exchange flow channel 222 is used to communicate the first heat exchange pipeline 11 and the refrigeration system.

[0093] It can be understood that the refrigeration system can transmit refrigerant to the first heat exchange pipeline 11 through the heat exchange flow channel 222, so that the first heat exchange assembly 1 can exchange heat with the battery cell 21 installed in the tray 22, and cooling of the battery cell 21 is realized.

[0094] And the first heat exchange pipeline 11 and the refrigeration system are communicated through the heat exchange flow channel 222, compared with the direct communication between the first heat exchange pipeline 11 and the refrigeration system, the length of the heat exchange path of the refrigerant and the battery pack body 2 is increased, which is beneficial to improve the heat exchange effect.

[0095] In some examples, the refrigeration system is, for example, an air conditioning system 5 or a vehicle thermal management system or any other suitable system with cooling function.

[0096] In some examples, the first heat exchange assembly 1 is connected to the opening of the tray 22, that is, the first heat exchange assembly 1 can play a role in closing the opening of the tray 22.

[0097] It should be noted that the first heat exchange assembly 1 can also have a refrigeration part, that is, the first heat exchange assembly 1 can also cool the battery pack body 2 without relying on the refrigeration system.

[0098] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the inlet of the heat exchange flow channel 222 is formed on the side wall surface of the tray 22, and the outlet of the heat exchange flow channel 222 is communicated with the first heat exchange pipeline 11.

[0099] It can be understood that the inlet of the heat exchange flow channel 222 is formed on the side wall surface of the tray 22, which is convenient for the connection between the refrigeration system and the heat exchange flow channel 222.

[0100] In some examples, the side wall surface of the tray 22 is formed with a heat exchange inlet and a heat exchange outlet, the heat exchange flow channel 222 includes a first heat exchange flow channel and a second heat exchange flow channel, the heat exchange inlet, the first heat exchange flow channel, the first heat exchange pipeline 11, the second heat exchange flow channel and the heat exchange outlet are communicated in sequence.

[0101] In some examples, the top of the tray 22 has a connecting surface, the first heat exchange assembly 1 is connected to the connecting surface, the inlet of the first heat exchange flow channel is communicated with the heat exchange inlet, the outlet of the first heat exchange flow channel is formed in the connecting surface and communicated with the first heat exchange pipeline 11, the inlet of the second heat exchange flow channel is formed in the connecting surface, the inlet of the second heat exchange flow channel is communicated with the first heat exchange pipeline 11, and the outlet of the second heat exchange flow channel is communicated with the heat exchange outlet.

[0102] In some examples, the battery pack body 2 further comprises a protective plate connected to the side of the tray 22 away from the first heat exchange assembly 1, which can protect the tray 22 to improve the safety of the battery pack body 2.

[0103] In some embodiments, referring to Figure 5 , Figure 6 and Figure 7 , the second heat exchange assembly 3 is integrated into the tray 22, which improves the integration of the tray 22 and enables the second heat exchange assembly 3 to directly exchange heat with the battery cells 21 mounted on the tray 22.

[0104] In some embodiments, referring to Figure 5 , Figure 6 and Figure 7 , the second heat exchange assembly 3 has a second heat exchange pipeline 33, which includes a pipeline body 331 and a connecting flow channel 332 that communicates the outlet of the pipeline body 331 with the inlet of the pipeline body 331, so that the second heat exchange assembly 3 can realize heat exchange circulation.

[0105] Specifically, referring to Figure 7 , Figure 8 and Figure 9 , the connecting flow channel 332 includes a first connecting pipeline 333, a second connecting pipeline 334 and a third connecting pipeline 335 communicated in sequence, the outlet of the pipeline body 331, the first connecting pipeline 333, the second connecting pipeline 334, the third connecting pipeline 335 and the inlet of the pipeline body 331 are communicated in sequence, so that the heat exchange medium of the second heat exchange assembly 3 can circulate along the outlet of the pipeline body 331, the first connecting pipeline 333, the second connecting pipeline 334, the third connecting pipeline 335 and the inlet of the pipeline body 331, realizing continuous heat exchange of the battery pack body 2.

[0106] In some embodiments, referring to Figure 7 , Figure 8 and Figure 9 , the second heat exchange assembly 3 is arranged on the bottom wall of the tray 22, the first connecting pipeline 333 is formed on the first side wall 223 of the tray 22, and the third connecting pipeline 335 is formed on the second side wall 224 of the tray 22, which realizes effective utilization of the space of the tray 22 and is conducive to simplifying the structure of the battery pack body 2.

[0107] Specifically, the first side wall 223 and the second side wall 224 are oppositely arranged, the second heat exchange assembly 3 is located between the first side wall 223 and the second side wall 224, and then the pipeline main body 331 is located between the first connecting pipeline 333 and the third connecting pipeline 335, so as to facilitate the connection of the pipeline main body 331 and the first connecting pipeline 333 and the connection of the pipeline main body 331 and the third connecting pipeline 335.

[0108] In some embodiments, the battery pack includes at least two second heat exchange assemblies 3.

[0109] Specifically, referring to Figure 7 , Figure 8 and Figure 9 , the first connecting pipeline 333 includes a first main pipeline 3331 and at least two first branch pipelines 3332, the at least two first branch pipelines 3332 correspond to the pipeline main bodies 331 of the at least two second heat exchange assemblies one by one, and the outlet of the pipeline main body 331, the first branch pipeline 3332, the first main pipeline 3331 and the second connecting pipeline 334 are sequentially communicated.

[0110] It can be understood that the heat exchange medium of the second heat exchange assembly is first delivered to the first branch pipeline 3332 through the pipeline main body 331, and then delivered to the first main pipeline 3331 through the first branch pipeline 3332, so that the heat exchange medium of different second heat exchange assemblies is gathered together to realize the multiplexing of the first main pipeline 3331, which is beneficial to simplify the pipeline structure and the structure of the battery pack body 2.

[0111] Specifically, referring to Figure 7 , Figure 8 and Figure 9 , the third connecting pipeline 335 includes a second main pipeline 3351 and at least two second branch pipelines 3352, the at least two second branch pipelines 3352 correspond to the pipeline main bodies 331 of the at least two second heat exchange assemblies one by one, and the second connecting pipeline 334, the second main pipeline 3351, the second branch pipeline 3352 and the inlet of the pipeline main body 331 are sequentially communicated.

[0112] It can be understood that the heat exchange medium of the second heat exchange assembly flows to the second main pipeline 3351 after the first connecting pipeline 333 and the second connecting pipeline 334, and then flows to each second branch pipeline 3352 from the second main pipeline 3351, and then flows back to the pipeline main body 331 from the second branch pipeline 3352, to realize the circulating flow of the heat exchange medium and the multiplexing of the second main pipeline 3351, which is beneficial to simplify the pipeline structure and the structure of the battery pack body 2.

[0113] In some examples, the driving pump 34, the flow valve 35 and the heating element 32 are connected to the second connecting pipeline 334.

[0114] In some examples, the second connection pipe 334 is connected to a valve, which is used to control the opening and closing of the second connection pipe 334.

[0115] According to a third aspect of this application, this application provides a vehicle including the aforementioned battery pack.

[0116] It is understandable that by integrating the first heat exchange component 1 and the second heat exchange component 3 into the battery thermal management system, the system can both cool the battery pack body 2 using the first heat exchange component 1 to lower its temperature and heat the battery pack body 2 using the second heat exchange component 3 to raise its temperature. In other words, this application enhances the functionality of the battery thermal management system, enabling it to meet the battery pack temperature requirements under different environmental conditions. This ensures the battery pack remains within a suitable temperature range under various circumstances, thereby improving the vehicle's driving range.

[0117] In some examples, the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit this.

[0118] In some embodiments, see Figure 1 The vehicle also includes a cooling circuit 4, which is used to cool the heat-generating components of the vehicle. The cooling circuit 4 is connected to the second heat exchange pipe 33 of the second heat exchange assembly 3 so that the cooling circuit 4 can heat the second heat exchange assembly 3.

[0119] Understandably, after the cooling circuit 4 exchanges heat with the heat-generating components of the vehicle, the temperature of the refrigerant in the cooling circuit 4 rises. Then, the refrigerant in the cooling circuit 4 flows to the second heat exchange pipe 33, so that the cooling circuit 4 can exchange heat with the second heat exchange component 3, thereby heating the second heat exchange component 3. This allows the second heat exchange component 3 to exchange heat with the battery pack body 2 to increase the temperature of the battery pack body 2, thereby realizing the recovery and utilization of heat from the heat-generating components of the vehicle.

[0120] In some examples, a control valve is provided between the cooling circuit 4 and the second heat exchange pipe 33, and the control valve is used to switch the cooling circuit 4 and the second heat exchange pipe 33 on and off.

[0121] In some embodiments, see Figure 1 The vehicle also includes an air conditioning system 5, which is connected to the first heat exchange component 1 and is used to exchange heat with the first heat exchange component 1.

[0122] It can be understood that the temperature of the first heat exchange assembly 1 is reduced by using the air conditioning system 5 of the vehicle and the first heat exchange assembly 1 to exchange heat, so that the first heat exchange assembly 1 can cool the battery pack body 2 to reduce the temperature of the battery pack body 2, while realizing the reuse of the air conditioning system 5.

[0123] Specifically, the air conditioning system 5 has a cooling pipeline in communication with the first heat exchange pipeline 11 of the first heat exchange assembly 1.

[0124] Specifically, the air conditioning system 5 includes a compressor, a temperature and pressure sensor PT2, a condenser, an electronic expansion valve EXV2, a direct cooling plate, an electronic expansion valve EXV3, a temperature and pressure sensor PT1, a pipeline, and a vehicle thermal management controller.

[0125] Specifically, the air conditioning system 5 includes a compressor, a temperature and pressure sensor PT2, a condenser, an electronic expansion valve EXV2, a direct cooling plate, an electronic expansion valve EXV3, a temperature and pressure sensor PT1, a pipeline, and a vehicle thermal management controller.

[0126] In this application, the working strategy of the battery pack cooling is as follows: the BMS detects the temperature of the battery pack body 2.

[0127] When the maximum battery temperature Tmax is greater than or equal to a threshold value, and the battery temperature difference Tmax-Tmin is less than or equal to a threshold value, the BMS requests to start cooling. The battery temperature and the temperature difference are monitored in real time until the cooling request is exited. If the battery temperature difference does not exceed the temperature difference setting threshold value, only the cooling request command needs to be requested to start cooling. If the battery Tmax does not reach the threshold value set for exiting cooling during the process, and the battery temperature difference Tmax-Tmin is greater than the temperature difference setting threshold value, the circulation function request command of the second heat exchange assembly 3 is requested to start at the same time as the cooling request command. Until the battery temperature difference Tmax-Tmin is less than or equal to the threshold value, the circulation function of the heat system is turned off, Tmax reaches the threshold value set for exiting cooling, and the cooling request command is turned off.

[0128] When the maximum battery temperature Tmax is greater than or equal to a threshold value, and the battery temperature difference Tmax-Tmin is greater than a threshold value, the BMS requests to start cooling and requests to start the circulation function of the second heat exchange assembly 3. Until the battery temperature difference Tmax-Tmin is less than or equal to the threshold value, the circulation function of the second heat exchange assembly 3 is turned off, Tmax reaches the threshold value set for exiting cooling, and the cooling request command is turned off.

[0129] The battery cooling request command is a request sent by the battery manager BMS to the vehicle air conditioner control, and the vehicle air conditioner control controls the compressor, the condenser, and the electronic expansion valves EXV2 and EXV3 in the battery direct cooling circuit. The first heat exchange assembly 1 is supplied with refrigerant, and the first heat exchange assembly 1 exchanges heat with the battery pack body 2 through the heat conduction member, thereby achieving battery cooling and controlling the battery temperature from being too high.

[0130] The circulation function of the second heat exchange assembly 3 is sent by the battery manager BMS to the battery heating control board, and the battery heating control board controls the pump and valve in the second heat exchange assembly 3. The circulation function of the second heat exchange assembly 3 only starts the water pump and valve, and does not start heating, the purpose is to enhance the heat exchange between the battery cells 21 and the battery cells 21, thereby reducing the temperature difference between the battery cells 21. Finally, the battery pack body 2 can better realize its performance in the vehicle, and is beneficial to the consistency of the battery, and is beneficial to prolong the service life of the battery.

[0131] In the present application, refer to Figure 10 and Figure 11 The heating member 32 includes a heating device 321 and a frame, and the heating device is composed of a special ceramic PTC in the middle, a special aluminum shell, a wire, etc. The heating device 321 includes fins 322, which is to increase the heating area and improve the heating efficiency. The above derived scheme has PTC changed into a heating rod, a heating sheet, etc. The heating template is a separate module placed in the battery pack body 2 or externally placed in the battery pack body 2, which is considered as a derived scheme of the present scheme.

[0132] The working principle of the battery pack heating and circulation is as follows:

[0133] When the minimum battery temperature Tmin is less than the threshold value, the BMS requests to start the circulation function of the second heat exchange assembly 3, and when the minimum battery temperature Tmin reaches the heating exit threshold value, the heating request is exited.

[0134] When the minimum battery temperature threshold value < Tmin < Tmax < threshold value, and the battery temperature difference Tmax-Tmin > threshold value, the BMS does not request cooling, and requests the second heat exchange assembly 3 to start, so as to reduce the temperature difference between the battery cells 21 and the battery cells 21.

[0135] When the minimum battery temperature threshold value < Tmin < Tmax < threshold value, and the battery temperature difference Tmax-Tmin > threshold value, the BMS does not request cooling, and requests the second heat exchange assembly 3 to start, so as to reduce the temperature difference between the battery cells 21 and the battery cells 21.

[0136] The heating function of the second heat exchange assembly 3 is issued by the battery manager BMS to the battery heating control panel, and the battery heating control panel controls the heating element 32, the pump and the valve in the second heat exchange assembly 3. The entering and exiting battery temperature threshold value of the request heating command can be set to different temperature threshold values according to different working condition requirements, so as to realize different heating strategies in different working conditions and break the traditional single fixed threshold value. At the same time, the water temperature requirement can be calculated by the battery temperature collected by the battery manager and the internal strategy logic, and then the number of PTCs that need to be turned on is controlled by confirming the number of PTCs that need to be turned on through internal calculation, so as to realize the temperature requirement of the battery water temperature. Each PTC has a switch control, and there is an insurance and a relay in the main circuit to ensure safety. The PTC in the text is a special PTC. When the set temperature reaches (such as 55℃, which can be different according to the performance of the PTC of different packages), the resistance will increase sharply, so as to realize a small amount of heat generation and ensure that the temperature will not continue to rise in extreme cases, ensuring safety. The battery temperature is in a more comfortable interval, and the battery can better exert its performance in the vehicle.

[0137] The circulation function of the second heat exchange assembly 3 only starts the pump and the valve, and does not start heating, the purpose is to enhance the heat exchange between the battery cells 21 and the battery cells 21, so as to realize the reduction of the temperature difference between the battery cells 21. Finally, the battery package body 2 can better realize its performance in the vehicle, and is beneficial to the consistency of the battery and the prolongation of the life of the battery.

[0138] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0139] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0140] The embodiments, implementation manners and related technical features of the present application can be combined, replaced with each other without conflict.

[0141] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, but any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A battery thermal management system, characterized in that, include: A first heat exchange component is connected to the battery pack body. The first heat exchange component is used to exchange heat with the battery pack body, so that the temperature of the battery pack body can be reduced. The second heat exchange component is connected to the battery pack body. The second heat exchange component is used to exchange heat with the battery pack body, so that the temperature of the battery pack body can be increased.

2. The battery thermal management system according to claim 1, characterized in that, The second heat exchange component includes a heat exchange element connected to the battery pack body. The heat exchange element is used to exchange heat with the battery pack body to increase the temperature of the battery pack body.

3. The battery thermal management system according to claim 2, characterized in that, The second heat exchange component further includes a heating element connected to the heat exchange component, which is used to heat the heat exchange component.

4. The battery thermal management system according to claim 3, characterized in that, The second heat exchange component has a second heat exchange pipeline, which connects the heating element and the heat exchange element, and is used to store the heat exchange medium.

5. The battery thermal management system according to claim 4, characterized in that, The second heat exchange assembly further includes a drive pump connected to the second heat exchange pipeline, the drive pump being used to drive the flow of the heat exchange medium within the second heat exchange pipeline; and / or, The second heat exchange component also includes a flow valve, which is connected to the second heat exchange pipeline.

6. The battery thermal management system according to claim 2, characterized in that, The second heat exchange component further includes a second temperature sensor, which is used to detect the temperature of the heat exchange medium flowing into the heat exchange component.

7. The battery thermal management system according to any one of claims 1 to 6, characterized in that, The battery pack body includes at least two battery cells, wherein, At least two of the battery cells are connected to the first heat exchange assembly; and / or, At least two of the battery cells are connected to the second heat exchange assembly.

8. The battery thermal management system according to any one of claims 1 to 6, characterized in that, The battery pack body includes at least two battery cells, wherein, The number of the first heat exchange components is at least two, with at least two of the battery cells and at least two of the first heat exchange components connected in a one-to-one correspondence, and at least two of the first heat exchange components interconnected to allow for heat exchange between the at least two of the first heat exchange components; and / or, The number of the second heat exchange components is at least two, and at least two of the battery cells and at least two of the second heat exchange components are connected in a one-to-one correspondence. At least two of the second heat exchange components are connected to each other so that at least two of the second heat exchange components can exchange heat with each other.

9. A battery pack, characterized in that, Includes the battery thermal management system as described in any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that, At least one of the first heat exchange component and the second heat exchange component is disposed within the internal space of the battery pack.

11. The battery pack according to claim 9 or 10, characterized in that, The battery pack body includes a tray and battery cells, the tray having a mounting cavity in which the battery cells are mounted.

12. The battery pack according to claim 11, characterized in that, The first heat exchange component is connected to the tray, the first heat exchange component forms a first heat exchange pipeline, the tray forms a heat exchange channel, and the heat exchange channel is used to connect the first heat exchange pipeline and the refrigeration system.

13. The battery pack according to claim 12, characterized in that, The inlet of the heat exchange channel is formed on the side wall of the tray, and the outlet of the heat exchange channel is connected to the first heat exchange pipeline.

14. The battery pack according to claim 11, characterized in that, The second heat exchange component is integrated into the tray.

15. The battery pack according to claim 11, characterized in that, The second heat exchange assembly has a second heat exchange pipeline, which includes a pipeline body and a connecting flow path, the connecting flow path connecting the outlet of the pipeline body and the inlet of the pipeline body.

16. The battery pack according to claim 15, characterized in that, The connecting flow path includes a first connecting pipe, a second connecting pipe, and a third connecting pipe connected in sequence. The outlet of the main body of the pipe is connected to the first connecting pipe, the second connecting pipe, the third connecting pipe, and the inlet of the main body of the pipe in sequence.

17. The battery pack according to claim 16, characterized in that, The second heat exchange component is disposed on the bottom wall of the tray, the first connecting pipe is formed on the first side wall of the tray, and the third connecting pipe is formed on the second side wall of the tray.

18. The battery pack according to claim 16, characterized in that, The battery pack includes at least two second heat exchange components, wherein... The first connecting pipeline includes a first main pipeline and at least two first branch pipelines, each of the at least two first branch pipelines corresponding one-to-one with the pipeline body of at least two second heat exchange components. The outlet of the pipeline body, the first branch pipeline, the first main pipeline, and the second connecting pipeline are sequentially connected; and / or, The third connecting pipeline includes a second main pipeline and at least two second branch pipelines. The at least two second branch pipelines correspond one-to-one with the pipeline bodies of at least two second heat exchange components. The inlets of the second connecting pipeline, the second main pipeline, the second branch pipelines, and the pipeline bodies are connected in sequence.

19. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 9 to 18.

20. The vehicle according to claim 19, characterized in that, The vehicle also includes a cooling circuit for cooling the heat-generating components of the vehicle. The cooling circuit is connected to a second heat exchange pipeline of the second heat exchange assembly so that the cooling circuit can heat the second heat exchange assembly.

21. The vehicle according to claim 19 or 20, characterized in that, The vehicle also includes an air conditioning system connected to the first heat exchange component, the air conditioning system being used for heat exchange with the first heat exchange component.

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