Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment. The battery pack comprises a plurality of battery cells, a cold plate and a heat conduction layer, and a first heat conduction layer is arranged between the pole shank of part of the battery cells and the cold plate. And a second heat conduction layer is arranged between the pole shank of part of the battery cells and the cold plate. The thermal resistance of the first heat conduction layer is larger than that of the second heat conduction layer. A first heat conduction layer is arranged between the pole core of the battery cell corresponding to the region with high heat exchange efficiency of the cold plate and the cold plate, and a second heat conduction layer is arranged between the pole core of the battery cell corresponding to the region with low heat exchange efficiency of the cold plate and the cold plate, so that the heat exchange efficiency between different regions of the cold plate and the battery cell is more uniform; and therefore, the temperature among different battery cells in the battery pack is more uniform, the temperature difference is small, the whole battery pack is safer, and the performance is better.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery pack and an electrical device. Background Art

[0002] In the related art, all battery cells in a battery pack are designed to be consistent, and multiple battery cells in the battery pack exchange heat through a cold plate. However, the heat exchange between different areas of the cold plate and the battery cells is uneven. The heat exchange efficiency between some areas of the battery cells and the cold plate is high, while the heat exchange efficiency between some areas of the battery cells and the cold plate is low, which will cause uneven temperature and large temperature difference between different battery cells in the battery pack, affecting the performance and safety of the entire pack. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery pack and an electrical device, in which the temperatures between different cells in the battery pack are more uniform and the temperature difference is smaller, so that the entire battery pack is safer and has better performance.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a battery pack in a first aspect, comprising:

[0005] Multiple cells;

[0006] Cold plates, used for heat exchange of battery cells; and

[0007] A heat-conducting layer, comprising a first heat-conducting layer and a second heat-conducting layer;

[0008] The first heat-conducting layer is arranged between the pole cores of some of the battery cells among the plurality of battery cells and the cold plate, and the second heat-conducting layer is arranged between the pole cores of some of the battery cells among the plurality of battery cells and the cold plate;

[0009] Wherein, the thermal resistance of the first heat-conducting layer is greater than the thermal resistance of the second heat-conducting layer.

[0010] Optionally, the heat-conducting layer includes a side plate of the shell of the battery cell;

[0011] The thermal resistance of the side plate of the first heat conducting layer is greater than the thermal resistance of the side plate of the second heat conducting layer.

[0012] Optionally, the heat conductive layer comprises a first attachment layer provided on a side surface of a side plate of the shell of the battery cell facing the cold plate;

[0013] A thermal resistance of the first attachment layer of the first heat conducting layer is greater than a thermal resistance of the first attachment layer of the second heat conducting layer.

[0014] Optionally, the first attachment layer is bonded or sprayed on the side panel.

[0015] Optionally, the first attachment layer of the first heat-conducting layer is made of porous material; and / or

[0016] The first attachment layer of the second heat-conducting layer is made of nitride-aluminum-oxygen compound or boron nitride material.

[0017] Optionally, the heat conductive layer comprises a first attachment layer provided on a side of the cold plate facing the battery core;

[0018] A thermal resistance of the first attachment layer of the first heat conducting layer is greater than a thermal resistance of the first attachment layer of the second heat conducting layer.

[0019] Optionally, the heat conductive layer includes an electrical insulation layer, and the electrical insulation layer is provided between the pole core of the battery cell and the side plate of the shell of the battery cell;

[0020] The thermal resistance of the electrical insulation layer of the first heat conducting layer is greater than the thermal resistance of the electrical insulation layer of the second heat conducting layer.

[0021] Optionally, the first heat-conducting layer comprises an intermediate heat-conducting section corresponding to the middle of the pole core and an end heat-conducting end connected to the intermediate heat-conducting section and corresponding to at least one end of the pole core; wherein the thermal resistance of the intermediate heat-conducting section is greater than the thermal resistance of the end heat-conducting section; and / or

[0022] The second heat-conducting layer includes an intermediate heat-conducting segment corresponding to the middle of the pole core and an end heat-conducting segment connected to the intermediate heat-conducting segment and corresponding to at least one end of the pole core; wherein the thermal resistance of the intermediate heat-conducting segment is greater than the thermal resistance of the end heat-conducting segment.

[0023] Optionally, the thermal conductivity of the first heat-conducting layer is 0.02 to 0.1 W / (m·K);

[0024] The thermal conductivity of the second heat-conducting layer is 30 to 80 W / (m·K).

[0025] A second aspect of the present disclosure discloses an electrical device, comprising the above-mentioned battery pack.

[0026] Through the above technical solution, a first heat-conducting layer is arranged between the pole core of some of the multiple battery cells and the cold plate, and a second heat-conducting layer is arranged between the pole core of some of the multiple battery cells and the cold plate. Among them, the thermal resistance of the first heat-conducting layer is greater than the thermal resistance of the second heat-conducting layer. The first heat-conducting layer is arranged between the pole core of the battery cell corresponding to the area with high heat exchange efficiency of the cold plate and the cold plate so that less heat is taken away from this part of the battery cell, and the second heat-conducting layer is arranged between the pole core of the battery cell corresponding to the area with low heat exchange efficiency of the cold plate and the cold plate so that more heat is taken away from this part of the battery cell, so that the heat exchange between different areas of the cold plate and the battery cell is more uniform, thereby making the temperature between different battery cells in the battery pack more uniform, with a small temperature difference, and the whole battery pack is safer and has better performance.

[0027] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0029] Figure 1 is a schematic structural diagram of multiple groups of battery cells and a cold plate in a battery pack disclosed in an exemplary embodiment of the present disclosure;

[0030] Figure 2 is an exploded schematic diagram of a battery core structure when the first heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes an electrical insulating layer;

[0031] Figure 3 is an exploded schematic diagram of a battery core structure when the second heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes an electrical insulating layer;

[0032] Figure 4 is an exploded schematic diagram of a battery cell structure when the first heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes a battery cell housing;

[0033] Figure 5 is an exploded schematic diagram of a battery cell structure when the second heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes a battery cell housing;

[0034] Figure 6 is an exploded schematic diagram of a battery core structure when the first heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes a first attachment layer;

[0035] Figure 7 is an exploded schematic diagram of a battery core structure when the second heat conductive layer disclosed in an exemplary embodiment of the present disclosure includes a first attachment layer;

[0036] Figure 8 is a schematic diagram of a cell structure disclosed in an exemplary embodiment of the present disclosure;

[0037] Fig. 9 is an exploded schematic diagram of a structure in which a first heat-conducting layer includes a first attachment layer according to an exemplary embodiment of the present disclosure, wherein the first heat-conducting layer includes a middle heat-conducting segment and an end heat-conducting segment;

[0038] Fig.10 1 is an exploded schematic diagram of a structure in which a second heat-conducting layer includes a first attachment layer according to an exemplary embodiment of the present disclosure, wherein the second heat-conducting layer includes a middle heat-conducting segment and an end heat-conducting segment.

[0039] Description of Reference Numerals

[0040] 10-cold plate; 11-area one; 12-area two; 20-battery cell; 21-housing; 211-side plate; 212-first attachment layer; 22-pole core; 23-electrical insulation layer; 24-pole; 31-first heat-conducting layer; 32-second heat-conducting layer; 33-end heat-conducting section; 34-middle heat-conducting section. DETAILED DESCRIPTION

[0041] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0042] In the present disclosure, unless otherwise specified, the directional words used, such as "inside" and "outside", refer to the inside and outside of the outline of the component or structure itself; unless otherwise specified, the terms "first" and "second" are used to distinguish one element from another, and do not have order or importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0043] The cold plate 10 in the battery pack can be used to cool the battery cells 20 in the battery pack. However, due to the flow order of the cooling medium in the cold plate 10 and the arrangement of the battery cells 20 in the battery pack, the heat exchange in different areas of the cold plate 10 is uneven, and the heat exchange efficiency of each area is different. For example, Figure 1 As shown, when the liquid-cooled cold plate 10 is used to cool down the battery cell 20, the area near the cooling medium injection port of the cold plate 10 is area 11, and the area near the cooling medium outlet is area 2 12. The cooling medium first flows through area 11 in the cold plate 10 to cool down the battery cell 20 corresponding to area 11, and then the cooling medium flows through area 2 12 again, and then flows out from the outlet. The temperature of the cooling medium in area 11 of the cold plate 10 is relatively low, and the battery cell 20 corresponding to this area can be quickly cooled, and the heat exchange efficiency between the battery cell 20 corresponding to this area and the cold plate 10 is relatively high; when the cooling medium flows through area 2 12, it has already carried some heat in area 11, resulting in a reduction in the cooling effect on the battery cell 20 corresponding to area 2 12, and a reduction in the heat exchange efficiency between the battery cell 20 corresponding to area 2 12 and the cold plate 10, resulting in uneven heat exchange in different areas of the cold plate 10.

[0044] In order to solve the above problems, in a first aspect of the present disclosure, a battery pack is provided, such as Figures 1 to 10As shown, it includes a plurality of battery cells 20, a cold plate 10 and a heat-conducting layer. A first heat-conducting layer 31 is arranged between the pole core 22 of some of the battery cells 20 and the cold plate 10. A second heat-conducting layer 32 is arranged between the pole core 22 of another part of the battery cells 20 and the cold plate 10. Among them, the thermal resistance of the first heat-conducting layer 31 is greater than the thermal resistance of the second heat-conducting layer 32. A first heat-conducting layer 31 is arranged between the pole core 22 of the battery cell 20 corresponding to the area with high heat exchange efficiency of the cold plate 10 and the cold plate 10, so that less heat is taken away from the part of the battery cell 20, and a second heat-conducting layer 32 is arranged between the pole core 22 of the battery cell 20 corresponding to the area with low heat exchange efficiency of the cold plate 10 and the cold plate 10, so that more heat is taken away from the part of the battery cell 20, so that the heat exchange efficiency between different areas of the cold plate 10 and the battery cell 20 is more uniform, thereby making the temperature between different battery cells 20 in the battery pack more uniform, with a small temperature difference, and the whole battery pack is safer and has better performance.

[0045] In the above-mentioned embodiment, a first heat-conducting layer 31 with higher thermal resistance is arranged between the pole core 22 of the battery cell 20 corresponding to the area with high heat exchange efficiency of the cold plate 10 and the cold plate 10, and a second heat-conducting layer 32 with lower thermal resistance is arranged in the area with low heat exchange efficiency of the cold plate 10, so that the heat exchange efficiency of the area with high heat exchange efficiency of the cold plate 10 is reduced and is close to the heat exchange efficiency of the area with low heat exchange efficiency of the cold plate 10, so that the heat exchange between the cold plate 10 and the battery cell 20 is more uniform, and thus the temperature between different battery cells 20 in the battery pack is more uniform.

[0046] It should be understood that, corresponding to different regions of the cold plate 10, the first heat-conducting layer 31 or the second heat-conducting layer 32 is provided between the cold plate 10 and the pole core 22 of the battery cell 20 in the corresponding region, in order to indicate that heat-conducting layers with different thermal resistances are provided between the pole core 22 of the battery cell 20 and the cold plate 10 corresponding to different regions of the cold plate 10. Therefore, the cold plate 10 can be divided into more regions with different heat exchange efficiencies, and the third heat-conducting layer, the fourth heat-conducting layer, and even more heat-conducting layers are provided accordingly, so as to make the heat exchange efficiency between different battery cells 20 and the cold plate 10 in the entire battery pack more uniform, and thus make the temperature between different battery cells 20 in the battery pack more uniform.

[0047] like Figure 1 As shown, a first heat-conducting layer 31 is arranged between the pole core 22 of the battery cell 20 corresponding to the area 11 of the cold plate 10 and the cold plate 10, and a second heat-conducting layer 32 is arranged between the pole core 22 of the battery cell 20 corresponding to the area 12 of the cold plate 10 and the cold plate 10, so that the temperature difference between the battery cell 20 corresponding to the area 11 of the cold plate 10 and the battery cell 20 corresponding to the area 2 12 of the cold plate 10 is reduced, the heat of the battery cells 20 in the battery pack is more uniform, the battery pack is safer, and the performance is better.

[0048] In some embodiments, the heat-conducting layer can be configured in any appropriate form according to actual needs. Figure 4and Figure 5 As shown, the heat conductive layer includes the side plate 211 of the shell 21 of the battery cell 20. According to the different regions of the cold plate 10 corresponding to the battery cells 20 in the battery pack, the thermal resistance of the side plate 211 of the shell 21 of the battery cells 20 corresponding to different regions of the cold plate 10 is different. For example, the thermal resistance of the side plate 211 of the first heat conductive layer 31 is greater than the thermal resistance of the side plate 211 of the second heat conductive layer 32.

[0049] In the above embodiment, the side plate 211 of the shell 21 included in the heat conductive layer may be the side plate 211 between the pole core 22 and the cold plate of the battery cell 20. The shell 21 of the battery cell 20 also includes other side plates, and the thermal resistance of the other side plates and the side plate 211 may be the same or different.

[0050] It should be noted that the side plate 211 of the shell 21 of the battery cell 20 is usually made of steel shell or aluminum shell. In order to change the thermal resistance of the side plate 211, aluminum or steel can be used as the base material when manufacturing the side plate 211 of the shell 21, and materials with different thermal resistances can be added to the substrate used to manufacture the side plate 211 to change its thermal resistance, so that the thermal resistance of the side plate 211 changes, thereby changing the heat exchange efficiency between the battery cell 20 and the cold plate 10.

[0051] It should be understood that other methods may be used to change the thermal resistance of the side plate 211 , which will not be described in detail here.

[0052] In some embodiments, Figure 6 and Figure 7 As shown, the heat-conducting layer includes a first attachment layer 212 disposed on the side of the side plate 211 of the shell 21 of the battery cell 20 facing the cold plate 10. According to the different regions of the cold plate 10 corresponding to the battery cells 20 in the battery pack, the thermal resistance of the first attachment layer 212 corresponding to the side plate 211 of the shell 21 of different battery cells 20 is different. For example, the thermal resistance of the first attachment layer 212 belonging to the first heat-conducting layer 31 is greater than the thermal resistance of the first attachment layer 212 belonging to the second heat-conducting layer 32.

[0053] In the above embodiment, the first attachment layer 212 can be bonded or sprayed on the side plate 211 of the housing 21. The first attachment layer 212 of the first heat conductive layer 31 can be made of porous material, and the first attachment layer 212 of the second heat conductive layer 32 can be made of nitrogen aluminum oxide or boron nitride material.

[0054] In some embodiments, the first attachment layer 212 belonging to the heat conductive layer may be provided on the side of the cold plate 10 facing the battery cell 20, wherein the thermal resistance of the first attachment layer 212 in different regions of the cold plate 10 is different. For example, the thermal resistance of the first attachment layer 212 belonging to the first heat conductive layer 31 is greater than the thermal resistance of the first attachment layer 212 belonging to the second heat conductive layer 32. As described above, the first attachment layer 212 of the first heat conductive layer 31 may be made of a porous material, and the first attachment layer 212 of the second heat conductive layer 32 may be made of a nitrogen aluminum oxide or a boron nitride material. In addition, the first attachment layer 212 may be bonded or sprayed on the side of the cold plate 10 facing the battery cell 20.

[0055] In some embodiments, Figure 2 and Figure 3 As shown, the heat-conducting layer includes an electric insulating layer 23, and the electric insulating layer 23 is arranged between the pole core 22 of the battery cell 20 and the side plate 211 of the shell 21 of the battery cell 20. The electric insulating layers 23 of different battery cells 20 corresponding to different regions of the cold plate 10 can be set to different thermal resistances to change the heat exchange efficiency between the pole core 22 of different battery cells 20 and the cold plate 10, so that the temperature of different battery cells 20 corresponding to different regions of the cold plate 10 is more uniform. Among them, the electric insulating layers 23 of different battery cells 20 may belong to the first heat-conducting layer 31 or the second heat-conducting layer 32, and the thermal resistance of the electric insulating layer 23 belonging to the first heat-conducting layer 31 is greater than the thermal resistance of the electric insulating layer 23 belonging to the second heat-conducting layer 32. Among them, the electric insulating layer 23 of the first heat-conducting layer 31 can be made of porous material, and the electric insulating layer 23 of the second heat-conducting layer 32 can be made of nitrogen aluminum oxide or boron nitride material.

[0056] It should be noted that at least one end of the pole core 22 is provided with a pole ear (not shown in the figure) for leading out the electrode, and the pole ear is connected to the pole post 24 of the battery cell 20 so that the electrode is connected to the pole post 24 through the pole ear, and the heat generated by the end of the pole core 22 where the pole ear is provided is greater than the heat generated by the middle part of the pole core 22.

[0057] Therefore, in some embodiments, for the first heat-conducting layer 31 disposed between the pole core 22 of the battery cell 20 and the cold plate 10, the first heat-conducting layer 31 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to at least one end of the pole core 22. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of at least one end region of the battery cell 20 is higher than that of the intermediate region, so that the heat conduction of different regions of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0058] In the above embodiment, when a pole lug is provided at one end of the pole core 22, the first heat-conducting layer 31 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to the end. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of the end region of the battery cell 20 is higher than that of the middle region, so that the heat conduction of different regions of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0059] When both ends of the pole core 22 are provided with pole ears, the first heat-conducting layer 31 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to the two ends. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of the two end regions of the battery cell 20 is higher than that of the middle region, so that the heat conduction of different regions of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is also more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0060] In addition, a second heat-conducting layer 32 may be provided between the pole core 22 of the battery cell 20 and the cold plate 10. The second heat-conducting layer 32 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to at least one end of the pole core 22. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of at least one end region of the battery cell 20 is higher than that of the middle region, so that the heat conduction of different regions of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0061] In the above embodiment, when a pole lug is provided at one end of the pole core 22, the second heat-conducting layer 32 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to the end. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of the end region of the battery cell 20 is higher than that of the middle region, so that the heat conduction of different regions of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is also more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0062] When both ends of the pole core 22 are provided with pole ears, the second heat-conducting layer 32 includes an intermediate heat-conducting segment 34 corresponding to the middle of the pole core 22 and an end heat-conducting segment 33 connected to the intermediate heat-conducting segment 34 and corresponding to the two ends. The thermal resistance of the intermediate heat-conducting segment 34 is greater than the thermal resistance of the end heat-conducting segment 33, so that the heat dissipation efficiency of the end area of ​​the battery cell 20 is higher than the heat dissipation efficiency of the middle area, so that the heat conduction of different areas of the battery cell 20 is more uniform, and the heat exchange between the battery cell 20 and the cold plate 10 is also more uniform, thereby making the overall temperature of the battery cell 20 more uniform.

[0063] like Fig. 9 and Fig.10 , which is a schematic diagram of the exploded structure of the battery cell 20 when the heat-conducting layer includes the first attachment layer 212. Fig. 9 2 is a schematic structural diagram of a first heat-conducting layer 31 including a first attachment layer 212 , wherein the first heat-conducting layer 31 includes a middle heat-conducting segment 34 and an end heat-conducting segment 33 ; Fig.10 2 is a schematic structural diagram of a second heat-conducting layer 32 including a first attachment layer 212 , and the second heat-conducting layer 32 includes a middle heat-conducting segment 34 and an end heat-conducting segment 33 .

[0064] In some embodiments, the thermal conductivity of the first thermal conductive layer 31 may be 0.02 to 0.1 W / (m·K). Selecting a material within this thermal conductivity range, such as a porous material, as the first thermal conductive layer 31 can allow the cold plate 10 to carry away less heat for part of the battery cells 20 or part of the battery cells 20 that exchange heat with the cold plate 10 through the first thermal conductive layer 31; the thermal conductivity of the second thermal conductive layer 32 may be 30 to 80 W / (m·K). Selecting a material within this thermal conductivity range, such as a nitrogen aluminum oxide or a boron nitride material, as the second thermal conductive layer 32 can allow the cold plate 10 to carry away more heat for part of the battery cells 20 or part of the battery cells 20 that exchange heat with the cold plate 10 through the second thermal conductive layer 32. As described above, the first heat-conducting layer 31 and the second heat-conducting layer 32 are appropriately arranged between the pole core 22 of the battery cell 20 and the cold plate 10, so that the heat exchange efficiency between different areas of the cold plate 10 and the battery cell 20 can be more uniform, thereby making the temperature between different battery cells in the battery pack more uniform, with a smaller temperature difference, making the entire battery pack safer and having better performance, which will not be elaborated here.

[0065] It should be noted that the thermal conductivity of the first heat-conducting layer 31 and the thermal conductivity of the second heat-conducting layer 32 may also be set to other values ​​according to actual needs, which are not limited here.

[0066] In a second aspect of the present disclosure, there is provided an electrical device including the above-mentioned battery pack. The electrical device has all the beneficial effects of the above-mentioned battery pack, which will not be described in detail herein.

[0067] In some embodiments, the electric device may be a vehicle, a portable device, a laptop computer, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle or a new energy vehicle; the electric toy may be a fixed or mobile electric toy, such as a game console, an electric car toy, etc.; the electric tool may be an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an impact drill, etc. In the case where the battery pack can be applied to the corresponding electric device, the present disclosure does not impose any special restrictions on the specific embodiments of the electric device.

[0068] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0070] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that: include: Multiple cells; Cold plate, used for heat exchange of battery cells; as well as A heat-conducting layer, comprising a first heat-conducting layer and a second heat-conducting layer; The first heat-conducting layer is arranged between the pole cores of some of the battery cells among the plurality of battery cells and the cold plate, and the second heat-conducting layer is arranged between the pole cores of some of the battery cells among the plurality of battery cells and the cold plate; Wherein, the thermal resistance of the first heat-conducting layer is greater than the thermal resistance of the second heat-conducting layer.

2. The battery pack according to claim 1, characterized in that: The heat-conducting layer includes a side plate of the shell of the battery cell; The thermal resistance of the side plate of the first heat conducting layer is greater than the thermal resistance of the side plate of the second heat conducting layer.

3. The battery pack according to claim 1, characterized in that: The heat-conducting layer comprises a first attachment layer provided on a side surface of a side plate of the shell of the battery cell facing the cold plate; A thermal resistance of the first attachment layer of the first heat conducting layer is greater than a thermal resistance of the first attachment layer of the second heat conducting layer.

4. The battery pack according to claim 3, characterized in that: The first attachment layer is bonded or sprayed on the side panel.

5. The battery pack according to claim 3, characterized in that: The first attachment layer of the first heat conductive layer is made of porous material; and / or The first attachment layer of the second heat-conducting layer is made of nitride-aluminum-oxygen compound or boron nitride material.

6. The battery pack according to claim 1, characterized in that: The heat conductive layer comprises a first attachment layer provided on a side of the cold plate facing the battery core; A thermal resistance of the first attachment layer of the first heat conducting layer is greater than a thermal resistance of the first attachment layer of the second heat conducting layer.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The heat-conducting layer includes an electrical insulation layer, and the electrical insulation layer is provided between the pole core of the battery core and the side plate of the shell of the battery core; The thermal resistance of the electrical insulation layer of the first heat conducting layer is greater than the thermal resistance of the electrical insulation layer of the second heat conducting layer.

8. The battery pack according to any one of claims 1 to 6, characterized in that: The first heat-conducting layer comprises an intermediate heat-conducting segment corresponding to the middle of the pole core and an end heat-conducting segment connected to the intermediate heat-conducting segment and corresponding to at least one end of the pole core; wherein the thermal resistance of the intermediate heat-conducting segment is greater than the thermal resistance of the end heat-conducting segment; and / or The second heat-conducting layer includes an intermediate heat-conducting segment corresponding to the middle of the pole core and an end heat-conducting segment connected to the intermediate heat-conducting segment and corresponding to at least one end of the pole core; wherein the thermal resistance of the intermediate heat-conducting segment is greater than the thermal resistance of the end heat-conducting segment.

9. The battery pack according to claim 1, characterized in that: The thermal conductivity of the first heat-conducting layer is 0.02 to 0.1 W / (m·K); The thermal conductivity of the second heat-conducting layer is 30 to 80 W / (m·K).

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-9.

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