Battery pack thermal management system and battery pack

Abstract

The invention discloses a battery pack thermal management system and a battery pack, and belongs to the field of battery thermal management, the battery pack thermal management system comprises: a cold plate which is arranged at the bottom of a battery module and is in contact with each battery cell of the battery module from the bottom for heat exchange, and a first flow channel is arranged in the cold plate; the plurality of heat dissipation assemblies are mounted on the cold plate and used for being arranged on the two sides of the battery module and making contact with each battery cell of the battery module from the two sides for heat exchange, second flow channels are formed in the heat dissipation assemblies, and the second flow channels are communicated with the first flow channels; and the cooling medium is filled in the first flow channel and the second flow channel. According to the battery pack, heat dissipation of the bottom face and the two side edge large faces of the battery cells can be achieved, the heat dissipation efficiency is effectively improved, all the battery cells in the battery pack can be controlled within a small temperature difference value range, the effect of precise temperature control is achieved, the temperature consistency of all the battery cells is effectively improved, and the service life of the battery pack is prolonged. And the accumulative cycle life of all battery cells in the battery pack is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery thermal management, and specifically to a battery pack thermal management system and a battery pack. Background Art

[0002] Among the energy storage battery pack products currently on the market, the mainstream battery cell temperature control solution is cold plate liquid cooling. This solution has huge limitations, which is specifically reflected in the fact that the heat-generating parts of the battery cell are mainly the tabs and the large surface of the battery cell, but the liquid cold plate is set at the bottom of the battery cell, and the tabs and the large surface of the battery cell cannot be directly cooled. Moreover, the actual situation that the bottom of the battery cell is cold and the top is hot, but it increases the temperature difference inside the battery cell during the charging and discharging process. This temperature difference will cause overcharging, over-discharging or insufficient charging and discharging during the charging and discharging process of each single battery cell. Among them, overcharging and over-discharging of the battery will cause battery safety problems and reduce battery life, while insufficient charging and discharging will reduce battery energy density and reduce battery life. In addition, it is very difficult to cool the liquid cold plate against the tabs, which will have a great impact on the measurement and collection of the temperature and voltage of the battery cell; the energy storage battery pack products using this solution also have the problem of a large proportion of auxiliary power consumption of the thermal management system.

[0003] There is also a battery cell temperature control solution on the market, which is full immersion liquid cooling. This solution is to completely immerse the battery cell in an insulating, non-toxic, heat-dissipating liquid, and take away the heat through direct contact with the liquid to achieve thermal management, and supplemented by a circulation system and a refrigeration system, using coolant as a heat dissipation medium to promptly, quickly, and efficiently take away the heat generated by the battery, so that the battery cell remains within the optimal temperature range. Although this solution solves the problem of comprehensive heat dissipation of the battery cell, it also brings new technical difficulties - the insulation of electrical components and the corrosion of electrical components. Although some energy storage battery pack products using this solution have been put into commercial use, the safety of the overall system has not been tested by time. Once the insulation of the electrical components is broken down or other failure problems occur, it will cause huge economic losses. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery pack thermal management system and a battery pack to solve at least one of the above technical problems.

[0005] In a first aspect, the present application provides a battery pack thermal management system, including: a cold plate, which is used to be set at the bottom of a battery module, and is in contact with each battery cell of the battery module from the bottom for heat exchange, and a first flow channel is provided in the cold plate; a plurality of heat dissipation components are installed on the cold plate, which are used to be set on both sides of the battery module, and are in contact with each battery cell of the battery module from both sides for heat exchange, and a second flow channel is provided in the heat dissipation component, and the second flow channel is connected to the first flow channel; and a cooling medium is filled in the first flow channel and the second flow channel.

[0006] In combination with the first aspect, in some optional embodiments, the cold plate includes an upper flat plate and a lower flow channel plate, the upper flat plate is provided with a medium inlet, a medium outlet, and a plurality of adapters, the adapters are used to connect the heat dissipation component, and the lower flow channel plate is provided with a first flow channel, the first flow channel is connected to the medium inlet, the medium outlet and a plurality of adapters.

[0007] In combination with the first aspect, in some optional embodiments, the first flow channel is a unidirectional flow structure, and the first flow channel includes multiple straight portions and multiple bent portions. The multiple straight portions are arranged in parallel, and the two outermost straight portions are respectively connected to the medium inlet and the medium outlet, and the two ends of each straight portion located in the middle are respectively connected to the corresponding ends of the adjacent straight portions through the bent portions.

[0008] In combination with the first aspect, in some optional embodiments, the heat dissipation assembly includes two adapters and at least one heat dissipation flat tube, the adapters are provided with interfaces on the side and bottom, the side interfaces are connected to the ends of the heat dissipation flat tubes, the bottom interfaces are connected to the cold plate, the heat dissipation flat tubes are connected between the two adapters, a plurality of second flow channels are provided in the heat dissipation flat tubes, the plurality of second flow channels are distributed along the height direction of the heat dissipation flat tubes, and all extend along the length direction of the heat dissipation flat tubes.

[0009] In combination with the first aspect, in some optional embodiments, at least one first fin structure is provided in the first flow channel, the first fin structure includes a first substrate and a plurality of first fins, the first substrate is vertically arranged on the flow channel wall of the first flow channel and extends along the first flow channel, the plurality of first fins are distributed on one side or both sides of the first substrate, each first fin is perpendicular to the first substrate and extends along the first flow channel; and / or, at least one second fin structure is provided in the second flow channel, the second fin structure includes a second substrate and a plurality of second fins, the second substrate is vertically arranged on the flow channel wall of the second flow channel and extends along the second flow channel, the plurality of second fins are distributed on one side or both sides of the second substrate, each second fin is perpendicular to the second substrate and extends along the second flow channel.

[0010] In combination with the first aspect, in some optional embodiments, the first fin structure also includes a first heat dissipation structure, which is a protrusion or a groove, and the first heat dissipation structure is arranged on the surface of the first fin and extends along the first flow channel; and / or, the second fin structure also includes a second heat dissipation structure, which is a protrusion or a groove, and the second heat dissipation structure is arranged on the surface of the second fin and extends along the second flow channel.

[0011] In combination with the first aspect, in some optional embodiments, a first spoiler structure and / or a first microstructure is provided on the flow channel wall of the first flow channel, and the first spoiler structure is a protrusion, a groove or a corrugation, which is used to generate turbulence when the cooling medium flows through, and the first microstructure is a microtexture or a pit, which is used to increase the surface area of ​​the flow channel wall; and / or, a second spoiler structure and / or a second microstructure is provided on the flow channel wall of the second flow channel, and the second spoiler structure is a protrusion, a groove or a corrugation, which is used to generate turbulence when the cooling medium flows through, and the second microstructure is a microtexture or a pit, which is used to increase the surface area of ​​the flow channel wall.

[0012] In combination with the first aspect, in some optional embodiments, the cooling medium is an environmentally friendly refrigerant.

[0013] In a second aspect, the present application provides a battery pack, comprising: a battery pack thermal management system in any one of the embodiments of the first aspect above; a plurality of battery modules, all of which are arranged on a cold plate, with one battery module arranged between every two heat dissipation components; and an upper cover, which forms a box body with the cold plate.

[0014] In combination with the second aspect, in some optional implementations, thermally conductive gel is filled between the cold plate and the battery module, and between the heat dissipation assembly and the battery module.

[0015] Based on the above technical scheme, the battery pack thermal management system and battery pack provided by the present application can achieve heat dissipation on three sides of each battery cell by contacting and exchanging heat with each battery cell of the battery module from the bottom through a cold plate, and by contacting and exchanging heat with the two large side surfaces of each battery cell of the battery module from both sides through a heat dissipation component, effectively improving the heat dissipation efficiency, and can also control each battery cell within a relatively small temperature difference range to achieve the effect of precise temperature control, effectively improve the temperature consistency of each battery cell, thereby improving the consistency of voltage, current, and resistance of each battery cell during the charging and discharging process, greatly reducing the barrel effect of a single battery cell, and raising the overall electric energy input-output conversion efficiency ratio of the battery pack, thereby improving the cumulative cycle life of all batteries in the battery pack. In addition, the heat dissipation component is arranged between two adjacent battery modules, which can effectively prevent the battery modules from squeezing each other when they heat up and expand, and can also avoid the mutual transfer of heat, which can improve the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1This is a schematic structural diagram of a battery pack thermal management system in the first embodiment of the present application.

[0018] Figure 2 It is a cross-sectional schematic diagram of a battery pack thermal management system in the first embodiment of the present application.

[0019] Figure 3 This is a schematic diagram of the top view of the structure of a downflow plate in the first embodiment of the present application.

[0020] Figure 4 for Figure 2 A partial enlarged view of a structure at position A.

[0021] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure.

[0022] Figure 6 for Figure 2 A partial enlarged view of another structure at A in the middle.

[0023] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure.

[0024] Figure 8 This is a schematic structural diagram of a heat dissipation component in the first embodiment of the present application.

[0025] Fig. 9 for Figure 2 A partial enlarged view of a structure at position B.

[0026] Fig.10 This is a schematic diagram of the structure of a battery pack in the second embodiment of the present application.

[0027] Fig.11 This is a schematic diagram of the structure of a battery pack with an upper cover hidden in the second embodiment of the present application.

[0028] Figure numerals: 1000, battery pack; 100, battery pack thermal management system; 10, cold plate; 11, upper plate; 111, medium inlet; 112, medium outlet; 12, lower flow channel plate; 121, first flow channel; 1211, straight portion; 1212, bending portion; 122, first fin structure; 1221, first substrate; 1222, first fin; 1223, first heat dissipation structure; 20, heat dissipation assembly; 21, adapter; 22, heat dissipation flat tube; 221, second flow channel; 30, fixing bracket; 200, battery module; 300, upper cover. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the description of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] In the description of this application, unless otherwise clearly specified and limited, the terms "connection", "setting", "installation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be that two elements are internally connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The terms "upper", "lower", "left", "right", "front", "back", "center", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the application is used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] The terms “first”, “second”, “third”, etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order, unless expressly specified and limited otherwise.

[0033] The terms "comprises," "includes," "has," or any other variation thereof, are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] The term "plurality" means more than two (including two).

[0035] The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0036] The terms "one embodiment", "as an example", "in one implementation", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example may be included in at least one embodiment or example of the present application. Schematic representations of such terms do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined in a suitable manner.

[0037] First embodiment Figure 1 This is a schematic structural diagram of a battery pack thermal management system 100 in the first embodiment of the present application. Figure 2 FIG. 1 is a cross-sectional schematic diagram of a battery pack thermal management system 100 in the first embodiment of the present application. Figure 1 and Figure 2 As shown, the first embodiment of the present application provides a battery pack thermal management system 100, including a cold plate 10, a heat dissipation component 20, and a cooling medium.

[0038] The cold plate 10 is used to be arranged at the bottom of the battery module, and contacts and exchanges heat with each battery cell of the battery module from the bottom. The heat dissipation component 20 is installed on the cold plate 10, and the heat dissipation component 20 is used to be arranged on the side of the battery module, and contacts and exchanges heat with each battery cell of the battery module from the side. There are multiple heat dissipation components 20, and multiple heat dissipation components 20 are used to be arranged on both sides of each battery module. A heat dissipation component 20 is arranged on both sides of each battery module, and the same heat dissipation component 20 can be shared between two adjacent battery modules. The interior of the cold plate 10 is connected to the interior of the heat dissipation component 20 and is filled with a cooling medium. Each part is described in detail below.

[0039] like Figure 1 and Figure 3 As shown, the cold plate 10 includes an upper flat plate 11 and a lower flow channel plate 12 connected to each other.

[0040] The upper plate 11 is provided with a medium inlet 111, a medium outlet 112, and a plurality of adapters (not shown in the figure), and the upper surface of the lower flow channel plate 12 is provided with a first flow channel 121, which is connected with the medium inlet 111, the medium outlet 112, and the plurality of adapters. The medium inlet 111 is used for the cooling medium to flow into the first flow channel 121, and the medium outlet 112 is used for the cooling medium to flow out of the first flow channel 121. Adapter blocks can be provided on the medium inlet 111 and the medium outlet 112, and the adapter blocks are used to connect external pipelines. The adapter is used to connect the heat dissipation component 20 so that the cooling medium flows through the heat dissipation component 20.

[0041] Regarding the arrangement of the first flow channel 121, as an example, Figure 3As shown, the first flow channel 121 is a one-way flow structure, and the first flow channel 121 includes a plurality of straight portions 1211 and a plurality of bent portions 1212. The plurality of straight portions 1211 are arranged in parallel, and the two outermost straight portions 1211 are respectively connected to the medium inlet 111 and the medium outlet 112 on the upper plate 11, and the two ends of each straight portion 1211 in the middle are respectively connected to the corresponding ends of the adjacent straight portions 1211 through the bent portions 1212.

[0042] Among them, at least one first fin structure 122 is disposed in the first flow channel 121 , and the first fin structure 122 is used to increase the heat exchange area with the cooling medium and improve the heat exchange efficiency.

[0043] Regarding the arrangement of the first fin structure 122, as an example, Figure 4 for Figure 2 A partial enlarged view of a structure at A in the middle. Figure 5 for Figure 4 The three-dimensional structure diagram of Figure 2 , Figure 4 as well as Figure 5 As shown, a plurality of first fin structures 122 are disposed in each straight portion 1211 of the first flow channel 121 , and the plurality of first fin structures 122 are disposed along the width direction of the straight portion 1211 . Each first fin structure 122 includes a first base 1221 and a plurality of first fins 1222 .

[0044] The first base 1221 is vertically disposed on the bottom surface of the straight portion 1211 and extends along the length direction of the straight portion 1211. The upper edge of the first base 1221 abuts against the upper plate 11. The first base 1221 can increase the heat exchange area between the straight portion 1211 and the cooling medium by dividing the space in the straight portion 1211 in the width direction.

[0045] The plurality of first fins 1222 are arranged on one side or both sides of the first substrate 1221, and are specifically arranged according to the width of the straight portion 1211. The plurality of first fins 1222 are arranged along the height direction of the first substrate 1221, and each first fin 1222 is perpendicular to the first substrate 1221 and extends along the length direction of the straight portion 1211. The first fins 1222 are relatively thin, and may be slightly deformed when the cooling medium flows through, so as to better contact the cooling medium. The plurality of first fins 1222 significantly increase the heat exchange area with the cooling medium, and improve the heat exchange efficiency.

[0046] As another example, Figure 6 for Figure 2 A partial enlarged view of another structure at A in the middle. Figure 7 for Figure 6 The three-dimensional structure diagram of Figure 2 , Figure 6 as well as Figure 7 As shown, each straight portion 1211 of the first flow channel 121 is provided with a plurality of first fin structures 122, and the plurality of first fin structures 122 are arranged along the width direction of the straight portion 1211 and are symmetrically arranged about the width midline of the straight portion 1211. Each first fin structure 122 includes a first base 1221, a plurality of first fins 1222, and a plurality of first heat dissipation structures 1223.

[0047] The first base 1221 is vertically disposed on the bottom surface of the straight portion 1211 and extends along the length direction of the straight portion 1211 . The upper edge of the first base 1221 abuts against the upper plate 11 .

[0048] A plurality of first fins 1222 are disposed on one side of the first substrate 1221, and the plurality of first fins 1222 are arranged along the height direction of the first substrate 1221. Each first fin 1222 is perpendicular to the first substrate 1221 and extends along the length direction of the straight portion 1211. Each first fin 1222 has a sufficient thickness so that the first heat dissipation structure 1223 can be processed on its surface.

[0049] The first heat dissipation structure 1223 is used to further increase the heat exchange area between the first fin 1222 and the cooling medium, and improve the heat exchange efficiency. The first heat dissipation structure 1223 can be a protrusion or a groove. As an example, the first heat dissipation structure 1223 is a plurality of first heat dissipation protrusions protruding from the upper surface and the lower surface of the first fin 1222, each of which extends along the length direction of the straight portion 1211. These first heat dissipation protrusions increase the surface area of ​​the first fin 1222, and further increase the heat exchange area between the first fin 1222 and the cooling medium.

[0050] In addition, a first spoiler structure (not shown in the figure) and a first microstructure (not shown in the figure) may be provided on the flow channel wall of the first flow channel 121. The first spoiler structure is a protrusion, a groove or a corrugation, which is used to generate turbulence when the cooling medium flows through, thereby enhancing the heat exchange effect. The first microstructure is a micro texture or a pit manufactured by micro-machining technology, which is used to increase the surface area of ​​the flow channel wall.

[0051] like Figure 1 and Figure 2 As shown, a plurality of heat dissipation components 20 are mounted on the upper surface of the cold plate 10 at equal intervals. Figure 3 The heat dissipation component 20 is arranged parallel to the straight portion 1211 of the first flow channel 121 .

[0052] Figure 8 FIG. 2 is a schematic diagram of the structure of a heat dissipation assembly 20 in the first embodiment of the present application. Figure 2 and Figure 8As shown, a single heat dissipation assembly 20 includes two adapters 21 and at least one heat dissipation flat tube 22 connected between the two adapters 21. Exemplarily, the number of the heat dissipation flat tubes 22 is three.

[0053] The adapter 21 is used to connect the heat dissipation flat tube 22 and the cold plate 10. As an example, the adapter 21 is a hollow square tube and is vertically arranged on the upper surface of the cold plate 10. One side and the bottom of the adapter 21 are provided with interfaces, the side interface is connected to the end of the heat dissipation flat tube 22, and the bottom interface is connected to the adapter interface on the cold plate 10.

[0054] In order to ensure that the multiple heat dissipation components 20 are firmly positioned on the cold plate 10 and will not fall over easily, Figure 1 As shown, two fixing brackets 30 are further provided on the upper surface of the cold plate 10, one fixing bracket 30 is clamped with the adapter 21 at one end of the plurality of heat dissipation components 20, and the other fixing bracket 30 is clamped with the adapter 21 at the other end of the plurality of heat dissipation components 20. As an example, the fixing bracket 30 is a square tube, and a plurality of bayonet holes (not shown in the figure) distributed at equal intervals are provided on one side of the fixing bracket 30, and these bayonet holes are used to clamp with the adapter 21 at the end of the plurality of heat dissipation components 20.

[0055] The two ends of the heat dissipation flat tube 22 are respectively connected to the interfaces on the sides of the two adapters 21. The heat dissipation flat tube 22 is used to contact the sides of each battery cell of the battery module to achieve heat exchange. As an example, Fig. 9 for Figure 2 A partial enlarged view of a structure at B in the figure, such as Figure 2 and Fig. 9 As shown, a plurality of second flow channels 221 are provided inside the heat dissipation flat tube 22, and the plurality of second flow channels 221 are distributed along the height direction of the heat dissipation flat tube 22 and extend along the length direction of the heat dissipation flat tube 22, and both ends of each second flow channel 221 are respectively connected to the inside of the two adapters 21. This structure of parallel arrangement of multiple flow channels allows the cooling medium to flow in parallel inside the heat dissipation flat tube 22, thereby increasing the heat exchange area between the heat dissipation flat tube 22 and the cooling medium, and improving the heat exchange efficiency.

[0056] Among them, at least one second fin structure (not shown in the figure) is provided in the second flow channel 221, and the second fin structure is used to increase the heat exchange area with the cooling medium and improve the heat exchange efficiency. The second fin structure includes a second substrate and a plurality of second fins. The specific structure can refer to the setting of the first fin structure 122, which will not be repeated here.

[0057] The second fin may be provided with a second heat dissipation structure (not shown in the figure), which is used to further increase the heat exchange area between the second fin and the cooling medium and improve the heat exchange efficiency. The second heat dissipation structure may be a protrusion or a groove. The second heat dissipation structure may refer to the configuration of the first heat dissipation structure 1223, which will not be described here.

[0058] The second flow channel 221 may be provided with a second spoiler structure (not shown in the figure) and a second microstructure (not shown in the figure) on the flow channel wall. The second spoiler structure is a protrusion, a groove or a corrugation, which is used to generate turbulence when the cooling medium flows through, thereby enhancing the heat exchange effect. The second microstructure is a micro texture or a pit made by micro-machining technology, which is used to increase the surface area of ​​the flow channel wall.

[0059] The heat dissipation flat tube 22 can be made of copper, aluminum alloy, stainless steel or other materials. As an example, the heat dissipation flat tube 22 is made of copper, which has good heat transfer coefficient and heat transfer performance.

[0060] The cooling medium uses R410A, R32, CO 2 , R1233zd or other environmentally friendly refrigerants with low GWP (Global Warming Potential) values. Compared with the traditional battery cell temperature control solution that uses ethylene glycol and water solvents as cooling media, environmentally friendly refrigerants have improved cooling energy efficiency and reduced power consumption under the same cooling capacity requirements, which can significantly reduce the operation and maintenance costs of energy storage battery pack products. At the same time, environmentally friendly refrigerants are gases, without the risk of liquid leakage. Even if a slight leak occurs, it will be directly vaporized. Therefore, using environmentally friendly refrigerants as cooling media significantly reduces the risk of leakage.

[0061] In summary, in the battery pack thermal management system 100 provided in the first embodiment of the present application, the cold plate 10 is used to contact and exchange heat with each battery cell of the battery module from the bottom, and the heat dissipation component 20 is used to contact and exchange heat with the two large side surfaces of each battery cell of the battery module from both sides. The battery pack thermal management system 100 can achieve heat dissipation on three sides of each battery cell, effectively improves the heat dissipation efficiency, and can also greatly improve the temperature control effect of the battery cell; the heat dissipation component 20 is arranged between two adjacent battery modules, which can effectively prevent the battery modules from squeezing each other when they heat up and expand, and can also avoid the mutual transfer of heat, thereby improving the service life of the battery cell.

[0062] Second embodiment Fig.10 This is a schematic structural diagram of a battery pack 1000 provided in the second embodiment of the present application. Fig.11 A schematic diagram of the structure of a battery pack 1000 after hiding the upper cover 300 provided in the second embodiment of the present application is shown in FIG. Fig.10 and Fig.11As shown, the second embodiment of the present application provides a battery pack 1000, including the battery pack thermal management system 100 in the first embodiment, a battery module 200, and an upper cover 300. The battery module 200 is composed of a plurality of battery cells, and the number of battery modules 200 is multiple. The plurality of battery modules 200 are arranged on a cold plate 10, and each battery module 200 is arranged between two heat dissipation components 20. The upper cover 300 and the cold plate 10 constitute the box of the battery pack 1000.

[0063] Among them, the space between the cold plate 10 and the battery module 200 and the space between the heat dissipation component 20 and the battery module 200 are filled with thermal conductive gel, and the thermal conductive gel is used to increase the contact area and improve the heat conduction efficiency.

[0064] When the battery module 200 is installed on the battery pack thermal management system 100, each battery cell can be assembled into a battery module 200 first, and then placed between the two heat dissipation components 20. Another installation method is to directly arrange each battery cell between the two heat dissipation components 20. Although this method simplifies the assembly process and reduces the production cost, it increases the cost of auxiliary materials such as fixing and insulation.

[0065] In summary, the second embodiment of the present application provides a battery pack 1000, which adopts the battery pack thermal management system 100 in the first embodiment to dissipate heat from the battery module 200, and can dissipate heat from the bottom and the two sides to the three sides of each battery cell, thereby effectively improving the heat dissipation efficiency. It can also control each battery cell within a relatively small temperature difference range, thereby achieving the effect of precise temperature control, and effectively improving the temperature consistency of each battery cell, thereby improving the consistency of voltage, current, and resistance of each battery cell during the charging and discharging process, greatly reducing the barrel effect of a single battery cell, and increasing the overall electric energy input-output conversion efficiency ratio of the battery pack 1000, thereby improving the cumulative cycle life of all battery cells in the battery pack 1000.

[0066] In addition, the battery pack thermal management system 100 saves on components such as water pumps and expansion tanks that require regular maintenance. Compared with battery packs that use traditional cold plate liquid cooling solutions and have a service life of about 7 to 10 years, the service life of the battery pack 1000 provided in the second embodiment of the present application is increased to about 15 years, significantly reducing the average cost per kilowatt-hour of electricity.

[0067] The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A battery pack thermal management system, characterized in that: include: A cold plate, arranged at the bottom of the battery module, and in contact with each battery cell of the battery module from the bottom for heat exchange, wherein a first flow channel is provided in the cold plate; A plurality of heat dissipation components are mounted on the cold plate and are used to be arranged on both sides of the battery module to contact and exchange heat with each battery cell of the battery module from both sides, wherein a second flow channel is provided in the heat dissipation component, and the second flow channel is communicated with the first flow channel; and A cooling medium is filled in the first flow channel and the second flow channel; Wherein, the cold plate includes an upper plate and a lower flow channel plate, the upper plate is provided with a medium inlet, a medium outlet, and a plurality of adapters, the adapters are used to connect the heat dissipation component, the lower flow channel is provided with the first flow channel, the first flow channel is connected with the medium inlet, the medium outlet and the plurality of adapters, the first flow channel is a one-way flow structure, and includes a plurality of straight portions and a plurality of bending portions, the plurality of straight portions are arranged in parallel, the two straight portions located on the outermost sides are respectively connected with the medium inlet and the medium outlet, and the two ends of each of the straight portions located in the middle are respectively connected with the corresponding ends of the adjacent straight portions through the bending portions; The heat dissipation assembly includes two adapters and at least one heat dissipation flat tube. The side and bottom of the adapter are provided with interfaces. The side interface is connected to the end of the heat dissipation flat tube, and the bottom interface is connected to the cold plate. The heat dissipation flat tube is connected between the two adapters. A plurality of second flow channels are provided in the heat dissipation flat tube. The plurality of second flow channels are distributed along the height direction of the heat dissipation flat tube and extend along the length direction of the heat dissipation flat tube.

2. The battery pack thermal management system according to claim 1, characterized in that: At least one first fin structure is disposed in the first flow channel, and the first fin structure includes a first substrate and a plurality of first fins. The first substrate is vertically disposed on the channel wall of the first channel and extends along the first channel. A plurality of the first fins are distributed on one side or two sides of the first substrate, and each of the first fins is perpendicular to the first substrate and extends along the first flow channel; and / or, At least one second fin structure is disposed in the second flow channel, and the second fin structure includes a second substrate and a plurality of second fins. The second substrate is vertically disposed on the channel wall of the second channel and extends along the second channel. A plurality of the second fins are distributed on one side surface or two side surfaces of the second base body, and each of the second fins is perpendicular to the second base body and extends along the second flow channel.

3. The battery pack thermal management system according to claim 2, characterized in that: The first fin structure further includes a first heat dissipation structure, the first heat dissipation structure is a protrusion or a groove, the first heat dissipation structure is arranged on the surface of the first fin and extends along the first flow channel; and / or, The second fin structure further includes a second heat dissipation structure, which is a protrusion or a groove. The second heat dissipation structure is arranged on the surface of the second fin and extends along the second flow channel.

4. The battery pack thermal management system according to claim 1, characterized in that: A first flow disturbance structure and / or a first microstructure is provided on the flow channel wall of the first flow channel, wherein the first flow disturbance structure is a protrusion, a groove or a corrugation, and is used to generate turbulence when the cooling medium flows through, and the first microstructure is a micro texture or a pit, and is used to increase the surface area of ​​the flow channel wall; and / or, The second flow channel wall is provided with a second spoiler structure and / or a second microstructure. The second spoiler structure is a protrusion, a groove or a corrugation, which is used to generate turbulence when the cooling medium flows through. The second microstructure is a microtexture or a pit, which is used to increase the surface area of ​​the flow channel wall.

5. The battery pack thermal management system according to claim 1, characterized in that: The cooling medium is an environmentally friendly refrigerant.

6. A battery pack, characterized in that: include: The battery pack thermal management system according to any one of claims 1 to 5; A plurality of battery modules are arranged on a cold plate, with one battery module being arranged between every two heat dissipation components; as well as The upper cover and the cold plate form a box body.

7. The battery pack according to claim 6, characterized in that: The space between the cold plate and the battery module, and the space between the heat dissipation component and the battery module are filled with thermal conductive gel.

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