Heat exchange plate assembly for battery pack, battery pack and vehicle

Abstract

The utility model discloses a heat exchange plate assembly for a battery pack, the battery pack and a vehicle, the heat exchange plate assembly comprises a shell and a non-phase change heat transfer pipeline, the shell comprises a heat exchange side wall, and the heat exchange side wall is suitable for being in heat conduction connection with a battery monomer; the non-phase-change heat transfer pipeline is arranged in the shell, the non-phase-change heat transfer pipeline and the heat exchange side wall are arranged in a spaced mode, a first cavity is defined between the non-phase-change heat transfer pipeline and the shell, a second cavity is formed in the non-phase-change heat transfer pipeline, and the first cavity is filled with a phase change material; an inlet and an outlet which are communicated with the two ends of the non-phase-change heat transfer pipeline respectively are formed in the shell. According to the heat exchange plate assembly provided by the embodiment of the utility model, the heat exchange plate assembly has better heat exchange effect and heat exchange capability, and can better adapt to use requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and in particular to a heat exchange plate assembly for a battery pack, a battery pack and a vehicle. Background Art

[0002] At present, new energy vehicles, especially pure electric vehicles, occupy a high share in the automobile market. Lithium-ion batteries have become the main power source for pure electric vehicles due to their high energy density and long life. However, lithium batteries generate a lot of heat during the discharge process. The accumulated heat that cannot be dissipated in time will seriously affect the working performance and life of lithium batteries.

[0003] In the related art, the cooling methods of battery packs (such as lithium batteries) mainly include: air cooling, liquid cooling and phase change material cooling. For example, air cooling means that the battery pack exchanges heat with the working environment through air, mainly including forced air cooling and natural air cooling. For example, the phase change material absorbs heat during the phase change process. The phase change material changes its physical state within a certain temperature range and stores energy in the process of changing the physical state, thereby playing a role in cooling the battery pack. However, in some technologies, the structural design of the heat exchange plate assembly is not reasonable enough and cannot adapt well to the heat exchange requirements of the battery pack. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a heat exchange plate assembly for a battery pack, a battery pack and a vehicle, wherein the heat exchange plate assembly has a good heat exchange effect and heat exchange capacity and can better meet the use requirements.

[0005] In a first aspect, an embodiment of the present application provides a heat exchange plate assembly for a battery pack, comprising: a shell, the shell comprising a heat exchange side wall, the heat exchange side wall being suitable for thermal connection with a battery cell; a non-phase change heat transfer pipeline, the non-phase change heat transfer pipeline being arranged in the shell, and the non-phase change heat transfer pipeline being spaced apart from the heat exchange side wall, a first cavity being defined between the non-phase change heat transfer pipeline and the shell, a second cavity being formed in the non-phase change heat transfer pipeline, the first cavity being filled with a phase change material, and an inlet and an outlet being formed on the shell and respectively connected to both ends of the non-phase change heat transfer pipeline.

[0006] In the above technical solution, by setting the branch pipeline to include at least one first-level branch pipeline, so that the heat exchange pipeline is constructed into a fractal tree structure, the heat exchange pipeline can be better distributed on the plane, that is, the heat exchange pipeline has a larger heat exchange area in the same occupied space, so that the heat exchange pipeline has a larger relative heat exchange area, which can improve the heat exchange effect of the non-phase change heat transfer pipeline. Secondly, the fractal tree structure can make the heat exchange pipeline have a lower flow channel pressure, that is, the heat exchange pipeline has a smaller flow resistance, which can increase the flow rate of the heat exchange medium in the heat exchange pipeline, thereby improving the heat exchange effect of the non-phase change heat transfer pipeline.

[0007] In some embodiments of the present application, the non-phase change heat transfer pipeline includes at least one heat exchange pipeline, the heat exchange pipeline includes a main pipeline and a branch pipeline, the main pipeline is connected to the branch pipeline, and the branch pipeline includes at least one level of branch pipeline, so that the heat exchange pipeline is constructed into a fractal tree structure.

[0008] In some embodiments of the present application, the branch pipeline includes at least four levels of branch pipelines, and the main pipeline, one of the first-level branch pipelines and one of the second-level branch pipelines enclose a U-shaped area, one of the third-level branch pipelines closes the U-shaped area, and at least one of the remaining branch pipelines of each level is arranged in the U-shaped area.

[0009] In some embodiments of the present application, the branch pipeline includes multiple levels of branch pipelines, the main pipeline is vertically connected to the first level of branch pipelines, and the two adjacent levels of branch pipelines are vertically connected.

[0010] In some embodiments of the present application, there are multiple heat exchange pipelines, and the multiple heat exchange pipelines are arranged in series or in parallel.

[0011] In some embodiments of the present application, there is one heat exchange side wall, or there are multiple heat exchange side walls that are arranged in parallel, the main pipeline and the branch pipeline of the same heat exchange pipeline are located on the same preset plane, and the multiple heat exchange pipelines are arranged in sequence along the normal of the preset plane, and the preset plane is parallel to the heat exchange side wall.

[0012] In some embodiments of the present application, the orthographic projections of at least the branch pipelines of the plurality of heat exchange pipelines on the preset plane overlap.

[0013] In some embodiments of the present application, the heat exchange pipelines are an even number, and two adjacent heat exchange pipelines are configured to form a pipeline group. The pipeline group is at least one group, and the last-stage branch pipeline of one of the two heat exchange pipelines in the pipeline group is connected to the last-stage branch pipeline of the other, the main pipeline of one of them is connected to the inlet, and the main pipeline of the other is connected to the outlet.

[0014] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery cell and a heat exchange plate assembly for a battery pack according to the embodiment of the first aspect of the utility model, wherein at least one of the two sides in the thickness direction of the heat exchange plate assembly has the heat exchange side wall, and the heat exchange side wall is thermally connected to at least one of the battery cells.

[0015] In the above technical solution, the performance of the battery pack can be improved by adopting the above heat exchange plate assembly.

[0016] In a third aspect, an embodiment of the present application provides a vehicle, comprising a battery pack according to an embodiment of the second aspect of the utility model.

[0017] In the above technical solution, by adopting the above battery pack, the cruising range of the vehicle can be improved.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a heat exchange plate assembly provided in some embodiments of the present application;

[0021] Figure 2 is a cross-sectional view of a heat exchange plate assembly provided in some embodiments of the present application;

[0022] Figure 3 is a schematic diagram of a non-phase change heat transfer pipeline provided in some embodiments of the present application;

[0023] Figure 4 yes Figure 3 Another schematic diagram of a non-phase change heat transfer pipeline shown in ;

[0024] Figure 5 is a schematic diagram of a heat exchange pipeline provided in some embodiments of the present application;

[0025] Figure 6 is a schematic diagram of a battery pack provided in some embodiments of the present application.

[0026] Reference numerals:

[0027] Battery pack 200, battery group 101, battery cell 1011, heat conducting member 102,

[0028] Heat exchange plate assembly 100,

[0029] Shell 1, first cavity 11, heat exchange side wall 12,

[0030] Non-phase-change heat transfer pipeline 2, second cavity 2a, inlet 2b, outlet 2c, pipeline group 2d, first U-shaped area 2e, second U-shaped area 2f,

[0031] Heat exchange pipeline 21, main pipeline 211, branch pipeline 212, branch pipeline 212a, first-level branch pipeline 2121, second-level branch pipeline 2122, third-level branch pipeline 2123, fourth-level branch pipeline 2124, fifth-level branch pipeline 2125, and sixth-level branch pipeline 2126. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0034] Hereinafter, with reference to the accompanying drawings, a heat exchange plate assembly 100 for a battery pack 200 according to an embodiment of the present invention will be described. Figure 6 The battery pack 200 includes a battery group 101 and a heat exchange plate assembly 100 . The battery group 101 includes a plurality of battery cells 1011 . Each battery cell 1011 is thermally connected to the heat exchange plate assembly 100 .

[0035] It should be noted that the battery cell 1011 is thermally connected to the heat exchange plate assembly 100, which can be understood as the battery cell 1011 is directly in contact with or indirectly thermally connected to the heat exchange plate assembly 100, and heat exchange can be performed between the battery cell 1011 and the heat exchange plate assembly 100.

[0036] like Figure 1 and Figure 2As shown, the heat exchange plate assembly 100 according to the embodiment of the utility model includes a shell 1 and a non-phase change heat transfer pipeline 2, the shell 1 includes a heat exchange side wall 12, the heat exchange side wall 12 is suitable for heat conduction connection with the battery cell 1011, the non-phase change heat transfer pipeline 2 is arranged in the shell 1, and the non-phase change heat transfer pipeline 2 and the heat exchange side wall 12 are spaced apart, a first cavity 11 is defined between the non-phase change heat transfer pipeline 2 and the shell 1, a second cavity 2a is formed in the non-phase change heat transfer pipeline 2, the first cavity 11 is filled with phase change material, and the non-phase change heat transfer pipeline 2 and the heat exchange side wall 12 can be separated by the phase change material, and an inlet 2b and an outlet 2c respectively connected to the two ends of the non-phase change heat transfer pipeline 2 are formed on the shell 1.

[0037] Thus, by arranging the phase change material and the non-phase change heat transfer pipeline 2 in the housing 1, the phase change material can undergo a phase change process to exchange heat with the battery cell 1011, and the heat exchange medium flowing in the non-phase change heat transfer pipeline 2 passes through the phase change material to exchange heat with the battery cell 1011, so that the heat exchange plate assembly 100 has a good heat exchange capacity and heat exchange effect, so that the battery cell 1011 can be maintained in a suitable temperature range, which is beneficial to improving the performance of the battery cell 1011 and the battery pack 101; at the same time, it is beneficial to increase the heat exchange area between the non-phase change heat transfer pipeline 2 and the battery cell 1011, and it is beneficial to reduce the influence of the shape of the non-phase change heat transfer pipeline 2 on the heat exchange area between the non-phase change heat transfer pipeline 2 and the battery cell 1011. It can be understood that the heat exchange medium does not undergo a phase change process during the circulation process in the non-phase change heat transfer pipeline 2. For example, the heat exchange medium can be water, cooling oil, etc.

[0038] First, a first cavity 11 is defined between the non-phase-change heat transfer pipeline 2 and the housing 1, and the first cavity 11 is filled with a phase-change material. The filled phase-change material can exchange heat with the battery cell 1011 before the non-phase-change heat transfer pipeline 2, for example, the phase-change material absorbs or releases heat during a phase change process to reduce or increase the temperature of the battery cell 1011. For example, the phase-change material is solid, and after the phase-change material absorbs enough heat, the temperature of the phase-change material rises to the melting point, and its physical state changes from solid to liquid. In this way, the phase-change material can store heat by undergoing a phase change process, that is, the phase-change material absorbs the heat generated by the battery cell 1011.

[0039] Among them, the non-phase change heat transfer pipeline 2 has a second cavity 2a, and the heat exchange medium can flow in the second cavity 2a, so that the non-phase change heat transfer pipeline 2 can participate in the heat exchange process of the phase change material, that is, the non-phase change heat transfer pipeline 2 and the phase change material can jointly exchange heat with the battery cell 1011, thereby improving the heat exchange capacity of the heat exchange plate assembly 100, so that the heat exchange plate assembly 100 has better heat exchange performance, so as to improve the heat exchange effect of the heat exchange plate assembly 100.

[0040] It should be noted that the heat exchange capacity of the phase change material is related to the filling amount of the phase change material in the first cavity 11. When the phase change materials in the first cavity 11 undergo a phase change process, the phase change material reaches the maximum heat exchange capacity (such as heat absorption or heat generation), such as the phase change material absorbs the most heat or releases the most heat. For example, taking the absorption of heat by the phase change material during the phase change process as an example, when the phase change materials in the first cavity 11 undergo a phase change process, such as the phase change material completely changes from solid to liquid, the heat absorbed by the phase change material at this time is the maximum heat that the phase change material in the first cavity 11 can absorb.

[0041] Optionally, when the heat transferred from the battery pack 101 (or the battery cell 1011) to the phase change material is lower than the heat absorption capacity of the phase change material, the phase change process of the phase change material can absorb all the heat that needs to be dissipated, that is, the phase change material can meet the heat dissipation requirements of the battery pack 101, and the non-phase change heat transfer pipeline 2 can be inoperative (for example, no heat exchange medium flows in the non-phase change heat transfer pipeline 2); when the heat generated by the battery pack 101 is higher than the heat absorption capacity of the phase change material, the phase change material is insufficient to absorb all the heat that needs to be dissipated from the battery pack 101, and the non-phase change heat transfer pipeline 2 works (for example, heat exchange medium flows in the non-phase change heat transfer pipeline 2), and the heat not absorbed by the phase change material is transferred to the non-phase change heat transfer pipeline 2, and the non-phase change heat transfer pipeline 2 takes away the excess heat through the heat exchange medium, so that the heat exchange plate assembly 100 can better adapt to the working requirements, improve the applicability of the heat exchange plate assembly 100, and help reduce the energy consumption of the heat exchange plate assembly 100. Optionally, when the amount of heat transferred from the battery pack 101 to the phase change material is lower than the amount of heat absorbed by the phase change material, the non-phase change heat transfer pipeline 2 can operate, which can shorten the cooling time of the heat exchange plate assembly 100 and improve the cooling efficiency of the heat exchange plate assembly 100. Optionally, the heat transferred from the battery pack 101 to the phase change material includes the heat generated when the battery cell 1011 is working and the heat transferred to the battery cell 1011 from the working environment of the battery pack 101 (for example, the working environment temperature of the battery pack 101 is higher than the appropriate working temperature of the battery cell 1011).

[0042] Similarly, when the heat required by the battery pack 101 is lower than the heat generated by the phase change material, the phase change material undergoes a phase change process and releases heat, that is, the phase change material can meet the working requirements of the battery pack 101, the battery pack 101 is within a suitable working temperature, and the non-phase change heat transfer pipeline 2 can not work (for example, no heat exchange medium flows in the non-phase change heat transfer pipeline 2); when the heat required by the battery pack 101 is higher than the heat generated by the phase change material, the phase change material is insufficient to release the heat required to meet the battery pack 101 at a suitable temperature, and the non-phase change heat transfer pipeline 2 works (for example, heat exchange medium flows in the non-phase change heat transfer pipeline 2). The non-phase change heat transfer pipeline 2 releases heat through the heat exchange medium to exchange heat with the battery pack 101, so as to increase the temperature of the battery pack 101 to a suitable temperature range to meet the working temperature requirements of the battery pack 101, so that the heat exchange plate assembly 100 can better adapt to working requirements, improve the applicability of the heat exchange plate assembly 100, and help reduce the energy consumption of the heat exchange plate assembly 100. Optionally, when the heat required by the battery pack 101 is lower than the heat generated by the phase change material, the non-phase change heat transfer pipeline 2 can work, which can shorten the heating time of the heat exchange plate assembly 100 and improve the heating efficiency of the heat exchange plate assembly 100. Optionally, the heat required by the battery pack 101 includes the heat required to raise the temperature of the battery cell 1011 to a suitable temperature range and the heat diffused into the working environment of the battery pack 101 (for example, the working environment temperature of the battery pack 101 is lower than the suitable working temperature of the battery cell 1011) during the heating process of the battery pack 101.

[0043] Therefore, the heat exchange plate assembly 100 adopts the coupling method of phase change material and non-phase change heat transfer pipeline 2 to exchange heat with the battery cell 1011. The heat exchange plate assembly 100 can utilize the performance of the phase change material, that is, the phase change process of the phase change material to absorb or release heat. Compared with some traditional cooling methods, the phase change process of the phase change material absorbing or releasing heat does not require the energy drive of the battery cell 101, which can reduce the energy consumed by the battery cell 1011 when the heat exchange plate assembly 100 is working. When the phase change material is not enough to meet the heat exchange of the battery cell 1011, the heat exchange medium can be circulated in the non-phase change heat transfer pipeline 2 to increase the heat exchange capacity of the heat exchange plate assembly 100 to make up for the insufficient heat exchange capacity of the phase change material. Therefore, the heat exchange plate assembly 100 adopts the design of a composite heat exchange system, that is, by coupling the phase change material and the non-phase change heat transfer pipeline 2, the heat exchange plate assembly 100 has a better heat exchange effect and heat exchange capacity, and can reduce the energy consumption of the battery pack 200, which is beneficial to increase the endurance of the battery pack 101.

[0044] It can be understood that the heat exchange plate assembly 100 has a first working state and a second working state. In the first working state, the non-phase change heat transfer pipeline 2 is not working (no heat exchange medium flows in the non-phase change heat transfer pipeline 2), and in the second working state, the non-phase change heat transfer pipeline 2 is working (heat exchange medium flows in the non-phase change heat transfer pipeline 2). Therefore, when the heat exchange plate assembly 100 is in the first working state, the phase change material meets the heat exchange demand of the battery pack 101 and can maintain the battery cell 1011 within a suitable temperature range; when the heat exchange plate assembly 100 is in the second working state, the phase change material is insufficient to meet the heat exchange demand of the battery pack 101, the non-phase change heat transfer pipeline 2 is working, and the heat exchange medium flows in the non-phase change heat transfer pipeline 2 to exchange heat with the battery pack 101, thereby improving the heat exchange capacity of the heat exchange plate assembly 100 to meet the heat exchange demand of the battery pack 101 and maintain the battery cell 1011 within a suitable temperature range.

[0045] For example, taking the case where the phase change material absorbs heat during the phase change process and the cooling medium flows in the non-phase change heat transfer pipeline 2, Figure 2 The heat exchange plate assembly 100 includes a shell 1 and a non-phase-change heat transfer pipeline 2. A first cavity 11 is defined between the shell 1 and the non-phase-change heat transfer pipeline 2. The first cavity 11 is filled with phase-change material. The shell 1 is formed with an inlet 2b and an outlet 2c. The non-phase-change heat transfer pipeline 2 is arranged in the shell 1, and the two ends of the non-phase-change heat transfer pipeline 2 are respectively connected to the inlet 2b and the outlet 2c. A second cavity 2a is formed in the non-phase-change heat transfer pipeline 2. Cooling medium can flow in the second cavity 2a to realize the circulation of cooling medium in the non-phase-change heat transfer pipeline 2.

[0046] The heat exchange plate assembly 100 is disposed on one side of the battery pack 101, and the heat exchange plate assembly 100 is thermally connected to a plurality of battery cells 1011. When the heat generated by the battery pack 101 is small during operation or the working environment temperature of the battery pack 101 is low, the phase change material absorbs the heat of the battery pack 101 and undergoes a phase change process to store the heat. At this time, the phase change material can absorb all the heat released by the battery pack 101, and the non-phase change heat transfer pipeline 2 is not working (at this time, the heat exchange plate assembly 100 is in the first working state); when the heat generated by the battery pack 101 is large during operation, the phase change material is insufficient to absorb all the heat emitted by the battery pack 101. At this time, the phase change material has completely undergone a phase change process, the non-phase change heat transfer pipeline 2 is working, and the cooling medium flows in the non-phase change heat transfer pipeline 2 to take away the heat not absorbed by the phase change material. Therefore, the phase change material and the non-phase change heat transfer pipeline 2 cooperate to absorb all the heat released by the battery pack 101 (at this time, the heat exchange plate assembly 100 is in the second working state).

[0047] Optionally, the shell 1 is a heat-conducting shell 1, such as a heat-conducting metal piece; the phase change material can be paraffin, acid wax, etc.; the inlet 2b and the outlet 2c on the shell 1 can be located on the same side or different sides of the shell 1, for example, in combination with Figure 2 The inlet 2b and the outlet 2c are located at opposite sides of the housing 1 respectively.

[0048] In the above technical solution, by arranging phase change material and non-phase change heat transfer pipeline 2 in the shell 1, the phase change material can undergo a phase change process to exchange heat with the battery cell 1011, and the heat exchange medium circulates in the non-phase change heat transfer pipeline 2 to exchange heat with the battery cell 1011, so that the heat exchange plate assembly 100 has better heat exchange capacity and heat exchange effect, thereby maintaining the battery cell 1011 within a suitable temperature range, which is beneficial to improving the performance of the battery cell 1011 and the battery pack 101.

[0049] In some embodiments of the present application, Figure 2 and Figure 3 The non-phase change heat transfer pipeline 2 includes at least one heat exchange pipeline 21, the heat exchange pipeline 21 includes a main pipeline 211 and a branch pipeline 212, the main pipeline 211 is connected to the branch pipeline 212, and the branch pipeline 212 includes at least one level of branch pipeline 212a, so that the heat exchange pipeline 21 is constructed into a fractal tree structure.

[0050] In the above technical solution, by setting the branch pipeline 212 to include at least one first-level branch pipeline 212a, so that the heat exchange pipeline 21 is constructed into a fractal tree structure, the heat exchange pipeline 21 can be better distributed on the plane, that is, the heat exchange pipeline 21 has a larger heat exchange area in the same occupied space, so that the heat exchange pipeline 21 has a larger relative heat exchange area, which can improve the heat exchange effect of the non-phase change heat transfer pipeline 2. Secondly, the fractal tree structure can make the heat exchange pipeline 21 have a lower flow channel pressure, that is, the heat exchange pipeline 21 has a smaller flow resistance, which can increase the flow rate of the heat exchange medium in the heat exchange pipeline 21, thereby improving the heat exchange effect of the non-phase change heat transfer pipeline 2.

[0051] Compared with the heat exchange scheme using a serpentine channel structure or a parallel channel structure in some technologies, in the embodiment of the present application, the heat exchange pipeline 21 is constructed into a fractal tree structure. The fractal tree structure can make the heat exchange pipeline 21 have a larger relative heat exchange area and smaller flow resistance, and the heat exchange pipeline 21 can effectively utilize the space in the shell 1, so that the non-phase change heat transfer pipeline 2 has better heat exchange uniformity (such as cooling uniformity), that is, the heat exchange effect of the non-phase change heat transfer pipeline 2 and the multiple battery cells 1011 of the battery pack 101 is basically the same, which is beneficial to ensure the consistency of the operating temperature of the multiple battery cells 1011 of the battery pack 101. At the same time, the non-phase change heat transfer pipeline 2 can occupy a smaller space volume and achieve the same heat exchange effect, thereby reducing the space occupied by the non-phase change heat transfer pipeline 2 in the shell 1, so that the first cavity 11 has a larger volume, that is, the first cavity 11 can accommodate more phase change material, which is beneficial to improve the heat exchange capacity of the phase change material.

[0052] Optionally, the branch pipeline 212 only includes a plurality of first-level branch pipelines 2121, and the heat exchange medium in the main pipeline 211 is distributed to the plurality of first-level branch pipelines 2121; or, the branch pipeline 212 includes first-level branch pipelines 2121 to n-th-level branch pipelines 212a that are sequentially connected along the flow direction, and each m-th-level branch pipeline 212a is connected to a plurality of (m+1)-th-level branch pipelines 212a, and the heat exchange medium in each m-th-level branch pipeline 2121a is distributed to the corresponding plurality of (m+1)-th-level branch pipelines 2121a, m and n are both positive integers, and m<n, for example, there are a plurality of first-level branch pipelines 2121, each The first-level branch pipeline 2121 is connected to two, three or more second-level branch pipelines 2122, and each second-level branch pipeline 2122 is connected to multiple third-level branch pipelines; there are multiple branch pipelines 212a at each level, and the lengths of the multiple branch pipelines 212a can be the same or different; the angle between the main pipeline 211 and the first-level branch pipeline 2021, and the angle between the m-th branch pipeline 212a and the m+1-th branch pipeline 212a are not limited, for example, the angle between the main pipeline 211 and the first-level branch pipeline 2121, and the angle between the first-level branch pipeline 2121 and the second-level branch pipeline 2122 are both 90°.

[0053] Optionally, the cross-sectional shape of the heat exchange pipeline 21 is not limited, for example, the cross-sectional shape of the heat exchange pipeline 21 may be square, circular, elliptical, etc. For example, the flow channel cross-sections of the main pipeline 211 and the branch pipeline 212 are square structures.

[0054] Optionally, the main pipeline 211 is connected to the branch pipeline 212, and the branch pipeline 212 includes a first-level branch pipeline 2121 to an n-th-level branch pipeline 212a that are sequentially connected along the flow direction. The main pipeline 211 is connected to A1 first-level branch pipelines 2121, and each level branch pipeline 212a is connected to A n For example, each first-level branch pipeline 212a is connected to A2 second-level branch pipelines, and each m-th-level branch pipeline 212a is connected to A m+1 The m+1-th branch pipeline 212a is connected to the A n The n-th branch pipelines 212a are connected, where n is a positive integer and corresponds to the number of the branch pipelines 212a; the equivalent diameter of the flow channel of the main pipeline 211 is D, the equivalent diameter of the flow channel of the first-level branch pipeline 2121 is D1, and the equivalent diameter of the flow channel of the m-th branch pipeline 212a is D m The equivalent diameter of the flow channel of the m+1th branch pipeline 212a is D m+1 The equivalent diameter of the flow channel of the nth branch pipeline 212a is D n , m, n are both positive integers, and 1≤m<n, A n is any positive integer greater than or equal to 2, then the heat exchange pipeline 21 is constructed into a fractal tree structure and satisfies D 3 =A1*D1 3 , D n-1 3 =A n *D n 3 .

[0055] In some embodiments of the present application, Figure 2 The branch pipeline 212 includes at least four levels of branch pipelines 212a, the main pipeline 211, one of the first-level branch pipelines 2121 and one of the second-level branch pipelines 2122 enclose a first U-shaped area 2e, one of the third-level branch pipelines 2123 closes the first U-shaped area 2e, that is, one of the third-level branch pipelines 2123 is arranged on the opening side of the first U-shaped area 2e, and at least one of the remaining branch pipelines 212a of each level is arranged in the first U-shaped area 2e. Thus, the remaining branch pipelines 212a can effectively utilize the space in the first U-shaped area 2e, making the heat exchange pipeline 21 more compact, which is conducive to increasing the relative heat exchange area of ​​the heat exchange pipeline 21, thereby improving the heat exchange effect of the heat exchange pipeline 21.

[0056] Optionally, the first U-shaped region 2e is understood in a broad sense, for example, the first U-shaped region 2e may be an open square structure, or an open circular structure, etc.

[0057] In some embodiments of the present application, Figure 2 , the branch pipeline 212 includes a multi-stage branch pipeline 212a, the main pipeline 211 is vertically connected to the first-stage branch pipeline 2121, and the two adjacent stages of branch pipelines 212a are vertically connected, that is, the m-th stage branch pipeline 212a is vertically connected to the (m+1)-th stage branch pipeline 212a. As a result, the arrangement of the multi-stage branch pipeline 212a can be made more compact, and the space in the shell 1 can be effectively utilized to arrange the branch pipeline 212a, which is beneficial to increase the relative heat exchange area of ​​the non-phase change heat transfer pipeline 2. Secondly, the main pipeline 211 is vertically connected to the first-stage branch pipeline 2121, and the two adjacent stages of branch pipelines 212a are vertically connected, so that the structure of the heat exchange pipeline 21 is approximately symmetrical, which is beneficial to simplify the design and processing difficulty of the heat exchange pipeline 21.

[0058] Optionally, combined Figure 5 , the adjacent three-level branch pipelines 212a enclose to form a second U-shaped area 2f, and at least one of the remaining branch pipelines 212a is arranged in the second U-shaped area 2f. It is convenient for at least one of the remaining branch pipelines 212a to effectively utilize the space in the second U-shaped area 2f, so that the heat exchange pipeline 21 is arranged more compactly, which is conducive to reducing the occupied space of the heat exchange pipeline 21. It can be understood that at least one of the remaining branch pipelines 212a is arranged in the second U-shaped area 2f, which can be understood as at least one level of branch pipelines 212a in the remaining branch pipelines 212a is arranged in the second U-shaped area 2f, or part of the branch pipelines 212a in at least one level of branch pipelines 212a in the remaining branch pipelines 212a is arranged in the second U-shaped area 2f.

[0059] For example, combined with Figure 5 The branch pipeline 212 includes six levels of branch pipelines 212a, and the six levels of branch pipelines 212a are respectively a first-level branch pipeline 2121, a second-level branch pipeline 2122, a third-level branch pipeline 2123, a fourth-level branch pipeline 2124, a fifth-level branch pipeline 2125 and a sixth-level branch pipeline 2126, and the outlet of each upper-level branch pipeline 212a is connected to two lower-level branch pipelines 212a, then the main pipeline 211 is connected to the two first-level branch pipelines 2121, and each first-level branch pipeline 2121 is connected to the two second-level branch pipelines 2126. 122, each second-level branch pipeline 2122 is connected to two third-level branch pipelines 2123, each third-level branch pipeline 2123 is connected to two fourth-level branch pipelines 2124, each fourth-level branch pipeline 2124 is connected to two fifth-level branch pipelines 2125, and each fifth-level branch pipeline 2125 is connected to two sixth-level branch pipelines 2126, so that the heat exchange pipeline 21 is constructed into a fractal tree structure, the main pipeline 211 is vertically connected to each first-level branch pipeline 2121, and each level of branch pipeline 212a is vertically connected to the next level of branch pipeline 212a.

[0060] The main pipeline 211, the first-level branch pipeline 2121 and the second-level branch pipeline 2122 enclose a first U-shaped area 2e, and the adjacent third-level branch pipeline 212a also encloses a second U-shaped area 2f. Figure 5 The main pipeline 211, the first-level branch pipeline 2121 and the second-level branch pipeline 2122 enclose a first U-shaped area 2e, the third-level branch pipeline 2123 closes the first U-shaped area 2e, and part of the fourth-level branch pipeline 2124, the fifth-level branch pipeline 2125 and the sixth-level branch pipeline 2126 are arranged in the first U-shaped area 2e; a first-level branch pipeline 2121, a second-level branch pipeline 2122 and a third-level branch pipeline 2123 enclose a second U The fourth-level branch pipeline 2124 encloses the second U-shaped area 2f, and part of the fifth-level branch pipeline 2125 and the sixth-level branch pipeline 2126 are arranged in the second U-shaped area 2f; a second-level branch pipeline 2122, a third-level branch pipeline 2123 and a fourth-level branch pipeline 2124 enclose the second U-shaped area 2f, the fifth-level branch pipeline 2125 encloses the second U-shaped area 2f, and part of the sixth-level branch pipeline 2126 is arranged in the second U-shaped area 2f. As a result, part of the branch pipeline 212a can utilize the space in the U-shaped area, making the heat exchange pipeline 21 more compact, which is conducive to reducing the occupied space of the heat exchange pipeline 21.

[0061] In some embodiments of the present application, Figure 3 There are multiple heat exchange pipes 21, and multiple heat exchange pipes 21 are arranged in series or in parallel. Therefore, the non-phase change heat transfer pipe 2 has a variety of structures, which can better adapt to the use requirements and the space in the shell 1, which is conducive to improving the applicability of the heat exchange plate assembly 100.

[0062] For example, combined with Figure 3Two heat exchange pipelines 21 are provided in the shell 1, and the last-stage branch pipelines 212a of the two heat exchange pipelines 21 are correspondingly connected. The main pipeline 211 of one heat exchange pipeline 21 is connected to the outlet 2c of the shell 1, and the main pipeline 211 of the other heat exchange pipeline 21 is connected to the inlet 2b of the shell 1. The heat exchange medium flows into one of the heat exchange pipelines 21 from the inlet 2b, and then flows from the last-stage branch pipeline 212a of one of the heat exchange pipelines 21 into the last-stage branch pipeline 212a of the other heat exchange pipeline 21, and finally flows from the other heat exchange pipeline 21 to the outlet 2c, so as to realize the series arrangement of the two heat exchange pipelines 21. Alternatively, a plurality of heat exchange pipelines 21 are provided in the shell 1, the main pipelines 211 of all the heat exchange pipelines 21 are arranged in parallel and connected to the outlet 2c of the shell 1, the last-stage branch pipelines 212a of all the heat exchange pipelines 21 are arranged in parallel and connected to the inlet 2b of the shell 1, and the heat exchange medium is diverted from the inlet 2b to the main pipelines 211 of all the heat exchange pipelines 21, and then converges from the last-stage branch pipelines 212a of all the heat exchange pipelines 21 to the outlet 2c. Alternatively, a plurality of heat exchange pipelines 21 are provided in the shell 1, the main pipelines 211 of some of the heat exchange pipelines 21 are arranged in parallel and communicated with the outlet 2c of the shell 1, the main pipelines 211 of another part of the heat exchange pipelines 21 are arranged in parallel and communicated with the inlet 2b of the shell 1, and the last-stage branch pipeline 212a of the heat exchange pipeline 21 in the above-mentioned part of the heat exchange pipelines 21 is correspondingly communicated with the last-stage branch pipeline 212a of the heat exchange pipeline 21 of the above-mentioned other part of the heat exchange pipelines 21, the heat exchange medium is diverted from the inlet 2b to the main pipeline 211 of the above-mentioned part of the heat exchange pipelines 21, and then flows from the last-stage branch pipeline 212a of the above-mentioned part of the heat exchange pipelines 21 into the last-stage branch pipeline 212a corresponding to the above-mentioned other part of the heat exchange pipelines 21, and finally converges from the above-mentioned other part of the heat exchange pipelines 21 to the outlet 2c.

[0063] In some embodiments of the present application, Figure 3 The main pipeline 211 and the branch pipeline 212 of the same heat exchange pipeline 21 are located on the same preset plane, and multiple heat exchange pipelines 21 are arranged in sequence along the normal direction of the preset plane, and the preset plane is parallel to the heat exchange side wall 12. There is one heat exchange side wall 12; or there are multiple heat exchange side walls 12 and the multiple heat exchange side walls 12 are arranged in parallel.

[0064] In the above technical scheme, by arranging the main pipeline 211 and the branch pipeline 212 of the same heat exchange pipeline 21 on the same preset plane, the heat exchange coordination between the heat exchange pipeline 21 and the battery pack 101 can be better achieved, which is beneficial to improving the heat exchange effect between the heat exchange pipeline 21 and the battery cell 1011, and by arranging multiple heat exchange pipelines 21 in sequence along the normal of the preset plane, the arrangement of the multiple heat exchange pipelines 21 is made more compact, which is beneficial to reducing the arrangement distance between two adjacent heat exchange pipelines 21, so that more heat exchange pipelines 21 can be accommodated in the shell 1, which is beneficial to improving the heat exchange efficiency of the heat exchange plate assembly 100 and simplifying the arrangement of multiple heat exchange pipelines 21. At the same time, it can avoid interference between the branch pipelines 212 of multiple heat exchange pipelines 21 to a certain extent, and can help reduce the occupied volume of the non-phase change heat transfer pipeline 2, which is beneficial to realizing the miniaturization of the heat exchange plate assembly 100.

[0065] In some embodiments of the present application, Figure 2 and Figure 3 , at least the orthographic projections of the branch pipelines 212 of the multiple heat exchange pipelines 21 on the preset plane overlap. Thus, it is conducive to making the arrangement of the heat exchange pipelines 21 simpler, more compact and more reasonable, and to simplifying the structural design of the heat exchange pipelines 21, and to facilitate the filling of the phase change material in the first cavity 11; in addition, it is also convenient for the branch pipelines 212a of the corresponding levels of the multiple heat exchange pipelines 21 to face each other along the normal direction of the preset plane, for example, the first-level branch pipelines 2121 of the multiple heat exchange pipelines 21 face each other along the normal direction of the preset plane, the second-level branch pipelines 2122 of the multiple heat exchange pipelines 21 face each other along the normal direction of the preset plane, ..., the nth-level branch pipelines 212a of the multiple heat exchange pipelines 21 face each other along the normal direction of the preset plane, and if the adjacent heat exchange pipelines 21 are connected, it is convenient for the last-level branch pipeline 212a of one heat exchange pipeline 21 to be connected with the last-level branch pipeline 212a of another heat exchange pipeline 21, so as to realize the series connection or parallel connection of the adjacent heat exchange pipelines 21.

[0066] In some embodiments of the present application, Figure 3, the heat exchange pipelines 21 are an even number, two adjacent heat exchange pipelines 21 are configured as a pipeline group 2d, the pipeline group 2d is at least one group, the last branch pipeline 212a of one of the two heat exchange pipelines 21 of the pipeline group 2d is connected with the last branch pipeline 212a of the other, the main pipeline 211 of the one is connected with the inlet 2b, and the main pipeline 211 of the other is connected with the outlet 2c. Therefore, by setting the heat exchange pipelines 21 to an even number, it is convenient to set the heat exchange pipelines 21 to realize the series connection of the two heat exchange pipelines 21 of the pipeline group 2d, so that the heat exchange medium can circulate in the pipeline group 2d, and it is convenient for the heat exchange medium to exchange heat with the battery cell 1011; when there are multiple pipeline groups 2d, the multiple pipeline groups 2d can be set in series or in parallel. Secondly, by setting the last-stage branch pipeline 212a of one of the two heat exchange pipelines 21 of the pipeline group 2d to be connected with the last-stage branch pipeline 212a of the other one, the connection of the two heat exchange pipelines 21 of the pipeline group 2d and the circulation of the heat exchange medium are facilitated, and the heat exchange medium can fully flow in each stage branch pipeline 212a of each heat exchange pipeline 21, and the pipeline group 2d can effectively utilize the space in the shell 1, thereby improving the space utilization rate of the non-phase change heat transfer pipeline 2. At the same time, the heat exchange medium can flow in at least two heat exchange pipelines 21, and the fractal tree structure of the heat exchange pipeline 21 can be effectively utilized, so that the non-phase change heat transfer pipeline 2 has a larger relative heat exchange area, which can further improve the heat exchange effect of the non-phase change heat transfer pipeline 2, so that the heat exchange plate assembly 100 has better heat exchange capacity and heat exchange effect.

[0067] For example, combined with Figure 2 and Figure 3 The shell 1 is formed with an inlet 2b and an outlet 2c, and the inlet 2b and the outlet 2c are located on opposite sides of the shell 1. The non-phase change heat transfer pipeline 2 includes two heat exchange pipelines 21, and the two heat exchange pipelines 21 are configured as a pipeline group 2d. The main pipeline 211 and the branch pipeline 212 of each heat exchange pipeline 21 are located on the same corresponding preset plane, and the two heat exchange pipelines 21 are arranged in sequence along the normal direction of the preset plane. Each heat exchange pipeline 21 includes a six-stage branch pipeline 212a, and the orthographic projections of the branch pipelines 212 of the two heat exchange pipelines 21 on the preset plane overlap, that is, the two heat exchange pipelines 21 are arranged in sequence along the normal direction of the preset plane, and the sixth-stage branch pipeline 2126 of one of the two heat exchange pipelines 21 is connected to the sixth-stage branch pipeline 2126 of the other, and the main pipeline 211 of one of the above-mentioned is connected to the inlet 2b, and the main pipeline 211 of the above-mentioned other is connected to the outlet 2c. In this way, the heat exchange medium can flow from the inlet 2b into one of the main pipes 211, then flow from the sixth-level branch pipe 2126 of one of the heat exchange pipes 21 into the sixth-level branch pipe 2126 of another heat exchange pipe 21, and finally the heat exchange medium flows from the other heat exchange pipe 21 to the outlet 2c.

[0068] Optionally, the non-phase change heat transfer pipeline 2 includes multiple groups of pipeline groups 2d, each group of pipeline group 2d includes two adjacently arranged heat exchange pipelines 21, the main pipeline 211 and the branch pipeline 212 of each heat exchange pipeline 21 are located on the same corresponding preset plane, and the multiple groups of pipeline groups 2d are arranged in sequence along the normal of the preset plane, and one of the heat exchange pipelines 21 in each group of pipeline groups 2d is arranged in parallel and connected to the inlet 2b, and the other heat exchange pipeline 21 in each group of pipeline groups 2d is arranged in parallel and connected to the outlet 2c.

[0069] In the second aspect, an embodiment of the present application provides a battery pack 200, including a battery cell 1011 and a heat exchange plate assembly 100 for the battery pack 200 according to the embodiment of the first aspect of the utility model, at least one of the two sides in the thickness direction of the heat exchange plate assembly 100 has a heat exchange side wall 12, and the heat exchange side wall 12 is thermally connected to at least one battery cell 1011.

[0070] In the above technical solution, the performance of the battery pack 200 can be improved by adopting the above heat exchange plate assembly 100 .

[0071] Optionally, combined Figure 6 , multiple battery cells 1011 corresponding to the same heat exchange side wall 12 can constitute a battery pack 101, and a heat conductive member 102 is provided between the battery pack 101 and the heat exchange side wall 12. The heat conductive member 102 is located on one side in the thickness direction of the heat exchange plate assembly 100 and heat conductively connects the multiple battery cells 1011 and the housing 1. In this way, the heat conduction between the battery pack 101 and the heat exchange plate assembly 100 can be enhanced, and the heat exchange effect of the heat exchange plate assembly 100 can be improved. Optionally, the heat conductive member 102 is a heat conductive material member with a high thermal conductivity, for example, the heat conductive member 102 is a heat conductive silicone member.

[0072] Optionally, in other embodiments, the battery pack 200 includes a plurality of heat exchange plate assemblies 100, at least one of the two sides in the thickness direction of each heat exchange plate assembly 100 is provided with a battery cell 1011, and each heat exchange plate assembly 100 is thermally connected to the battery cell 1011, and the plurality of heat exchange plate assemblies 100 are arranged in series or in parallel. For example, the battery pack 200 includes a plurality of battery cells 1011 and a plurality of heat exchange plate assemblies 100, and the plurality of heat exchange plate assemblies 100 are arranged in series, then the outlet 2c of one of two adjacent heat exchange plate assemblies 100 is connected to the inlet 2b of the other, the plurality of battery cells 1011 are arranged in sequence along the thickness direction of the heat exchange plate assembly 100, and a heat exchange plate assembly 100 is provided between two adjacent battery cells 1011, then a battery cell 1011 is provided on each side in the thickness direction of the heat exchange plate assembly 100, and each battery cell 1011 is thermally connected to the heat exchange plate assembly 100.

[0073] In a third aspect, an embodiment of the present application provides a vehicle, comprising a battery pack 200 according to the embodiment of the second aspect of the utility model.

[0074] In the above technical solution, by adopting the above battery pack 200, the cruising range of the vehicle can be improved.

[0075] In the description of the present invention, it should be understood that the terms "length", "thickness", "upper", "lower", "front", "back", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0076] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat exchange plate assembly for a battery pack, characterized in that: include: A housing, the housing comprising a heat exchange side wall, the heat exchange side wall being adapted to be thermally connected to a battery cell; A non-phase-change heat transfer pipeline, the non-phase-change heat transfer pipeline is arranged in the shell, and the non-phase-change heat transfer pipeline is spaced from the heat exchange side wall, a first cavity is defined between the non-phase-change heat transfer pipeline and the shell, a second cavity is formed in the non-phase-change heat transfer pipeline, the first cavity is filled with phase change material, and an inlet and an outlet respectively connected to both ends of the non-phase-change heat transfer pipeline are formed on the shell.

2. The heat exchange plate assembly for a battery pack according to claim 1, characterized in that: The non-phase-change heat transfer pipeline includes at least one heat exchange pipeline, the heat exchange pipeline includes a main pipeline and a branch pipeline, the main pipeline is connected to the branch pipeline, and the branch pipeline includes at least one level of branch pipeline, so that the heat exchange pipeline is constructed into a fractal tree structure.

3. The heat exchange plate assembly for a battery pack according to claim 2, characterized in that: The branch pipeline includes at least four levels of branch pipelines, and the main pipeline, one of the first-level branch pipelines and one of the second-level branch pipelines enclose a first U-shaped area, one of the third-level branch pipelines closes the first U-shaped area, and at least one of the remaining branch pipelines of each level is arranged in the first U-shaped area.

4. The heat exchange plate assembly for a battery pack according to claim 2, characterized in that: The branch pipeline includes multiple levels of branch pipelines, the main pipeline is vertically connected to the first level of branch pipelines, and two adjacent levels of branch pipelines are vertically connected.

5. The heat exchange plate assembly for a battery pack according to any one of claims 2 to 4, characterized in that: There are multiple heat exchange pipelines, and the multiple heat exchange pipelines are arranged in series or in parallel.

6. The heat exchange plate assembly for a battery pack according to claim 5, characterized in that: There is one heat exchange side wall, or there are multiple heat exchange side walls that are arranged in parallel. The main pipeline and the branch pipeline of the same heat exchange pipeline are located on the same preset plane. The multiple heat exchange pipelines are arranged in sequence along the normal of the preset plane, and the preset plane is parallel to the heat exchange side wall.

7. The heat exchange plate assembly for a battery pack according to claim 6, characterized in that: The orthographic projections of at least the branch pipelines of the plurality of heat exchange pipelines on the preset plane overlap.

8. The heat exchange plate assembly for a battery pack according to claim 5, characterized in that: The heat exchange pipelines are in an even number, and two adjacent heat exchange pipelines form a pipeline group. There is at least one pipeline group. The last-stage branch pipeline of one of the two heat exchange pipelines in the pipeline group is connected to the last-stage branch pipeline of the other one, the main pipeline of one of them is connected to the inlet, and the main pipeline of the other one is connected to the outlet.

9. A battery pack, characterized in that: It comprises a battery cell and a heat exchange plate assembly for a battery pack according to any one of claims 1 to 8, wherein at least one of the two sides in the thickness direction of the heat exchange plate assembly has the heat exchange side wall, and the heat exchange side wall is thermally connected to at least one of the battery cells.

10. A vehicle, characterized in that: Comprising the battery pack according to claim 9.

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