Battery pack, battery module and energy storage device

Abstract

The utility model provides a battery pack, a battery module and an energy storage device, and the battery pack comprises a shell provided with an accommodating cavity; the battery core assembly is arranged in the accommodating cavity; the heat conduction layer is arranged between the inner wall of the shell and the battery core assembly and is used for carrying out heat exchange with the battery core assembly, and at least one part of the heat conduction layer comprises a graphene film layer. When heat generated by the battery cell assembly is transferred to the graphene film layer, the heat is quickly transferred in the direction perpendicular to the thickness direction of the graphene film layer and is dispersed to the periphery of the graphene film layer, so that the overall temperature of the graphene film layer is approximately the same, the heat is quickly dispersed, and the heat utilization rate is improved. The temperature difference between the battery cell in the middle and the battery cells on the two sides in the heating or heat dissipation process of the battery pack is reduced, the overall temperature consistency of the battery pack is improved, the situation of thermal runaway caused by local overheating of the battery pack is avoided, the battery efficiency of the battery pack is remarkably improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery equipment technology, and more specifically, to a battery pack, a battery module, and an energy storage device. Background Technology

[0002] Currently, as the energy storage capacity of battery packs increases, the number and capacity of the cells within the battery pack also increase. This results in a larger temperature difference between the cells located in the middle and those located on the sides, making the battery pack prone to localized overheating, which affects the battery pack's lifespan and battery efficiency. Utility Model Content

[0003] The embodiments of this utility model are intended to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, a first aspect of the embodiments of the present invention provides a battery pack.

[0005] A second aspect of the embodiments of this utility model provides a battery module.

[0006] A third aspect of the embodiments of this utility model provides an energy storage device.

[0007] In view of the above, according to a first aspect of the present invention, a battery pack is provided, the battery pack comprising: a housing having a receiving cavity; a battery cell assembly disposed within the receiving cavity; and a thermally conductive layer disposed between the inner wall of the housing and the battery cell assembly for heat exchange with the battery cell assembly, wherein at least a portion of the thermally conductive layer comprises a graphene film layer.

[0008] The battery pack provided in this embodiment includes a housing, a cell assembly, and a heat-conducting layer. Specifically, the housing has a receiving cavity, and the cell assembly is disposed within the receiving cavity, thereby providing space for the cell assembly. Optionally, the cell assembly includes multiple cells arranged along the width direction of the cell assembly.

[0009] The heat-conducting layer is placed between the inner wall of the housing and the cell assembly, and the heat-conducting layer is used to exchange heat with the cell assembly. In other words, during the operation of the battery pack, the heat generated by the cell assembly is transferred to the housing through the heat-conducting layer, and the housing exchanges heat with the external environment to achieve heat dissipation.

[0010] It is understandable that during the heat dissipation process of the battery pack, there is a certain temperature difference between the cells located in the middle and the cells located on both sides. Especially under certain heating conditions, the temperature difference between the cells located in the middle and the cells located on both sides is large, which makes the battery pack prone to local overheating.

[0011] At least a portion of the thermally conductive layer comprises a graphene film. Specifically, the entire thermally conductive layer is a graphene film. Alternatively, the thermally conductive layer comprises a thermally conductive film and a graphene film, with the thermally conductive film located between the battery cell assembly and the graphene film, or the graphene film located between the thermally conductive film and the battery cell assembly. The specific configuration can be tailored to actual needs.

[0012] It is understandable that graphene films have characteristics such as high thermal conductivity, low temperature rise, good flexibility, high adhesion, and resistance to breakage. Among them, the lateral thermal conductivity of graphene films can reach 1900 W / (m·k). When the graphene film is located between the bottom of the battery cell assembly and the inner wall of the casing, the lateral thermal conductivity of the graphene film is the thermal conductivity in the horizontal direction, which means that the thermal conductivity of the graphene film is relatively high in the direction perpendicular to the thickness of the graphene film.

[0013] Specifically, when the heat generated by the battery cell assembly is transferred to the graphene film, the heat is rapidly transferred in the direction perpendicular to the thickness of the graphene film and dispersed to the periphery of the graphene film, making the overall temperature of the graphene film roughly the same. This rapid heat dissipation reduces the temperature difference between the cells in the middle and the cells on both sides of the battery pack during heating or cooling, improves the overall temperature consistency of the battery pack, avoids local overheating and thermal runaway, significantly improves the battery efficiency of the battery pack, and extends the service life of the battery pack.

[0014] Furthermore, while meeting the battery pack's heat dissipation requirements under extreme conditions, the battery pack's capacity can be increased, thereby improving the battery pack's stability and reliability, and enhancing the product's competitiveness.

[0015] Optionally, the density of the graphene film is 0.7 g / cm³. 3 ~2.1g / cm 3 .

[0016] Optionally, the density of the graphene film is 1.7 g / cm³. 3 ~2.0g / cm 3 .

[0017] Optionally, the transverse thermal conductivity of the graphene film is less than or equal to 1900 W / (m·K). Optionally, the transverse thermal conductivity of the graphene film is between 1100 W / (m·K) and 1600 W / (m·K), the longitudinal thermal conductivity is 10 W / (m·K), and it can withstand high temperatures up to 400℃, has a flame retardant rating of V0, high flexibility, and can withstand more than 10,000 bends without breaking.

[0018] In addition, the battery pack provided by the above-described technical solution of this utility model also has the following additional technical features:

[0019] In some technical solutions, optionally, the cross-sectional area of ​​the graphene film layer perpendicular to the thickness direction is greater than or equal to the area of ​​the side of the battery cell assembly facing the heat conduction layer.

[0020] In this technical solution, it can be understood that when the graphene film is located between the bottom of the battery cell assembly and the inner wall of the casing, the cross section of the graphene film perpendicular to the thickness direction is the cross section of the graphene film.

[0021] The cross-sectional area of ​​the graphene film layer perpendicular to its thickness direction is greater than or equal to the area of ​​the side of the battery cell assembly facing the heat-conducting layer. This increases the cross-sectional area of ​​the graphene film layer, allowing the heat generated by the battery cell assembly to be transferred to the graphene film layer through the side of the battery cell assembly facing the heat-conducting layer, thus improving heat exchange efficiency. Furthermore, the heat transferred to the graphene film layer can be rapidly dispersed to the periphery of the graphene film layer perpendicular to its thickness direction, reducing the temperature difference between the cells in the middle and the cells on both sides of the battery pack during heating or cooling. This prevents localized overheating and thermal runaway, significantly improving the battery efficiency and extending the battery pack's lifespan.

[0022] Moreover, the increased cross-sectional area of ​​the graphene film also helps to improve the heat exchange effect between the graphene film and the casing, thereby enhancing the heat dissipation efficiency of the battery pack.

[0023] In some technical solutions, optionally, the thermally conductive layer is attached to the side of the battery cell assembly facing the battery cell assembly.

[0024] In this technical solution, the heat-conducting layer is positioned so that the side facing the battery cell assembly is in contact with the battery cell assembly, thereby enabling the heat generated by the battery cell assembly to be transferred to the graphene film layer as much as possible, significantly improving the heat exchange efficiency.

[0025] Moreover, the heat transferred to the graphene film can be rapidly dispersed to the periphery of the graphene film perpendicular to its thickness direction, reducing the temperature difference between the cells in the middle and those on both sides during the heating or cooling process of the battery pack. This prevents local overheating and thermal runaway, significantly improving the battery efficiency and extending the battery pack's lifespan.

[0026] In some technical solutions, optionally, the side of the thermally conductive layer facing away from the battery cell assembly is attached to the inner wall of the housing.

[0027] In this technical solution, the side of the thermally conductive layer facing away from the battery cell assembly is fitted against the inner wall of the casing. This means that the heat generated by the battery cell assembly is transferred to the graphene film, where it rapidly disperses laterally and is then transferred to the casing. The casing then exchanges heat with the external environment to achieve heat dissipation. Fitting the thermally conductive layer against the inner wall of the casing improves heat exchange efficiency, thereby enhancing the heat dissipation effect.

[0028] In some technical solutions, the battery pack may optionally include an adapter plate, which is electrically connected to the cell assembly; wherein, along the height direction of the cell assembly, the adapter plate and the heat-conducting layer are located on opposite sides of the cell assembly.

[0029] In this technical solution, the battery pack also includes an adapter plate, specifically, the adapter plate is electrically connected to the cell assembly. The adapter plate and the thermal conductive layer are located on opposite sides of the cell assembly in the height direction. Optionally, the adapter plate is located at the top of the cell assembly, and the thermal conductive layer is located at the bottom of the cell assembly. Alternatively, the adapter plate is located at the bottom of the cell assembly, and the thermal conductive layer is located at the top of the cell assembly. The specific configuration can be adjusted according to actual needs.

[0030] By distributing the adapter plate and the heat-conducting layer on both sides of the cell assembly height, the battery pack structure can be rationally laid out while ensuring the heat dissipation effect of the cell assembly, thereby improving the internal space utilization of the battery pack.

[0031] In some technical solutions, optionally, the battery cell assembly includes multiple battery cells, and a thermally conductive layer is disposed between each battery cell and the inner wall of the housing.

[0032] In this technical solution, the battery cell assembly is defined as including multiple battery cells, and optionally, the multiple battery cells are arranged along the width direction of the battery cell assembly.

[0033] A thermally conductive layer is placed between each cell and the inner wall of the casing, which ensures that each cell is in full contact with the thermally conductive layer for heat exchange, thus improving the heat dissipation effect of the battery pack.

[0034] Moreover, when the heat generated by multiple cells is transferred to the graphene film, the heat is rapidly transferred in the direction perpendicular to the thickness of the graphene film and dispersed to the periphery of the graphene film, making the overall temperature of the graphene film roughly the same. This rapid heat dissipation reduces the temperature difference between the cells in the middle and the cells on both sides of the battery pack during heating or cooling, improves the overall temperature consistency of the battery pack, avoids local overheating and thermal runaway, significantly improves the battery efficiency of the battery pack, and extends the service life of the battery pack.

[0035] In some technical solutions, the housing may optionally include a housing body and two end plates. Along the width direction of the battery cell assembly, the two end plates are located on both sides of the battery cell assembly, and the two end plates and the housing body enclose a receiving cavity. A thermally conductive layer is disposed between the inner wall of the housing body and the battery cell assembly; and / or a thermally conductive layer is disposed between the inner wall of at least one end plate and the battery cell assembly.

[0036] In this technical solution, the housing is defined to include a housing body and two end plates. Specifically, along the width direction of the cell assembly, the two end plates are located on both sides of the cell assembly.

[0037] A thermally conductive layer is disposed between the inner wall of the casing and the battery cell assembly. Alternatively, the thermally conductive layer is disposed between the inner wall of one of the end plates and the battery cell assembly. Alternatively, the thermally conductive layer is disposed between the inner wall of each end plate and the battery cell assembly. Alternatively, a thermally conductive layer is disposed between the inner wall of the casing and the battery cell assembly, and also between the inner wall of each end plate and the battery cell assembly. These are not all listed here. The specific configuration can be determined according to actual needs.

[0038] Since at least a portion of the thermally conductive layer comprises a graphene film, and the graphene film has a high thermal conductivity in the direction perpendicular to its thickness, when the heat generated by the battery cell is transferred to the graphene film, the heat is rapidly transferred in the direction perpendicular to the thickness of the graphene film and dispersed to the periphery of the graphene film, making the overall temperature of the graphene film approximately the same. This rapid heat dissipation reduces the temperature difference between the cells in the middle and those on the sides of the battery pack during heating or cooling, improves the overall temperature consistency of the battery pack, avoids localized overheating that could lead to thermal runaway, significantly improves the battery efficiency of the battery pack, and extends its service life.

[0039] In some technical solutions, optionally, the thickness d of the graphene film layer satisfies 12μm≤d≤100μm.

[0040] In this technical solution, the thickness of the graphene film is limited to a specific range. Specifically, the thickness of the graphene film is between 12 μm and 100 μm to ensure effective heat dissipation.

[0041] According to a second aspect of the present invention, a battery module is provided, comprising a battery pack as provided by any of the above technical solutions, and thus possessing all the beneficial technical effects of the battery pack, which will not be elaborated further here.

[0042] According to a third aspect of this utility model, an energy storage device is provided, comprising a battery pack or battery module as provided by any of the above technical solutions, and thus possessing all the beneficial technical effects of the battery pack or battery module, which will not be repeated here.

[0043] Additional aspects and advantages of the present invention will be set forth in the description which follows, in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description

[0044] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0045] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention is shown;

[0046] Figure 2 The thermal simulation results of the battery pack in the related technology are shown;

[0047] Figure 3 A thermal simulation result diagram of a battery pack according to an embodiment of the present invention is shown.

[0048] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0049] 100 Battery pack, 110 Housing, 111 Receiving cavity, 112 Housing body, 113 End plate, 120 Cell assembly, 121 Cell, 130 Thermal conductive layer, 131 Graphene film layer, 140 Adapter plate. Detailed Implementation

[0050] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0051] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0052] The following reference Figure 1 and Figure 3 This invention describes a battery pack 100, a battery module, and an energy storage device provided according to some embodiments of the present invention.

[0053] In one embodiment according to this application, such as Figure 1As shown, a battery pack 100 is proposed, comprising: a housing 110 having a receiving cavity 111; a battery cell assembly 120 disposed within the receiving cavity 111; and a thermally conductive layer 130 disposed between the inner wall of the housing 110 and the battery cell assembly 120 for heat exchange with the battery cell assembly 120, wherein at least a portion of the thermally conductive layer 130 comprises a graphene film layer 131.

[0054] The battery pack 100 provided in this embodiment includes a housing 110, a cell assembly 120, and a heat-conducting layer 130. Specifically, the housing 110 is provided with a receiving cavity 111, and the cell assembly 120 is disposed within the receiving cavity 111, thereby providing receiving space for the cell assembly 120. Optionally, the cell assembly 120 includes a plurality of cells 121, which are arranged along the width direction of the cell assembly 120.

[0055] The heat-conducting layer 130 is disposed between the inner wall of the housing 110 and the cell assembly 120, and the heat-conducting layer 130 is used to exchange heat with the cell assembly 120. That is, during the operation of the battery pack 100, the heat generated by the cell assembly 120 is transferred to the housing 110 through the heat-conducting layer 130, and the housing 110 exchanges heat with the external environment to achieve heat dissipation.

[0056] It is understandable that during the heat dissipation process of the battery pack 100, there is a certain temperature difference between the battery cell 121 located in the middle and the battery cells 121 located on both sides. Especially under certain heating conditions, the temperature difference between the battery cell 121 located in the middle and the battery cells 121 located on both sides is large, which makes the battery pack 100 prone to local overheating.

[0057] At least a portion of the thermally conductive layer 130 includes a graphene film layer 131. Specifically, the entire thermally conductive layer 130 is a graphene film layer 131. Alternatively, the thermally conductive layer 130 includes a thermally conductive film layer and a graphene film layer 131, with the thermally conductive film layer located between the battery cell assembly 120 and the graphene film layer 131, or the graphene film layer 131 located between the thermally conductive film layer and the battery cell assembly 120. The specific configuration can be tailored to actual needs.

[0058] It is understandable that the graphene film 131 has characteristics such as high thermal conductivity, low temperature rise, good flexibility, high adhesion and not easy to break. Among them, the lateral thermal conductivity of the graphene film 131 can reach 1900W / (m·k). When the graphene film 131 is located between the bottom of the battery cell assembly 120 and the inner wall of the housing 110, the lateral thermal conductivity of the graphene film 131 is the thermal conductivity in the horizontal direction, that is, the thermal conductivity of the graphene film 131 is relatively high in the direction perpendicular to the thickness of the graphene film 131.

[0059] Specifically, when the heat generated by the cell assembly 120 is transferred to the graphene film layer 131, the heat is rapidly transferred in the direction perpendicular to the thickness of the graphene film layer 131 and dispersed to the periphery of the graphene film layer 131, making the overall temperature of the graphene film layer 131 approximately the same. This rapid heat dissipation reduces the temperature difference between the cell 121 in the middle and the cells 121 on both sides of the battery pack 100 during heating or cooling, improves the overall temperature consistency of the battery pack 100, avoids local overheating of the battery pack 100 that could lead to thermal runaway, significantly improves the battery efficiency of the battery pack 100, and extends the service life of the battery pack 100.

[0060] Furthermore, while meeting the heat dissipation requirements of the battery pack 100 under extreme conditions, the capacity of the battery pack 100 can be increased, thereby improving the stability and reliability of the battery pack 100 and enhancing the competitiveness of the product.

[0061] Figure 2 A thermal simulation diagram of the effect of setting a heat-insulating silicone pad at the bottom of the battery pack in the relevant technology under the original working conditions, such as... Figure 2 As shown, the highest temperature was 58.3℃ and the lowest temperature was 54.2℃, with a difference of 4.1℃ between the highest and lowest temperatures. This means that under certain heating conditions, the cells in the middle of the battery pack have different temperatures than the cells on both sides, resulting in a large temperature difference that affects battery efficiency.

[0062] Figure 3 To provide a thermally conductive layer 130, at least partially composed of a graphene film 131, between the bottom of the battery cell assembly 120 and the inner wall of the housing 110, a thermal simulation diagram is provided under the same operating conditions as the original scenario, as shown below. Figure 3 As shown, the highest temperature was 56.7℃ and the lowest temperature was 55.5℃, with a difference of 1.2℃ between the highest and lowest temperatures. This represents a significant improvement compared to the original operating conditions, ensuring the overall consistency of the battery pack 100 during heating or cooling processes, and greatly improving battery efficiency and lifespan.

[0063] Optionally, the density of the graphene film 131 is 0.7 g / cm³. 3 ~2.1g / cm 3 .

[0064] Optionally, the density of the graphene film 131 is 1.7 g / cm³. 3 ~2.0g / cm 3 .

[0065] Optionally, the transverse thermal conductivity of the graphene film 131 is less than or equal to 1900 W / (m·K). Optionally, the transverse thermal conductivity of the graphene film 131 is between 1100 W / (m·K) and 1600 W / (m·K), the longitudinal thermal conductivity is 10 W / (m·K), and it can withstand high temperatures up to 400℃, has a flame retardant rating of V0, high flexibility, and can withstand more than 10,000 bends without breaking. Details are shown in the table below:

[0066]

[0067]

[0068] In some embodiments, the cross-sectional area of ​​the graphene film 131 perpendicular to the thickness direction is greater than or equal to the area of ​​the side of the battery cell assembly 120 facing the heat conduction layer 130.

[0069] In this embodiment, it is understood that when the graphene film 131 is located between the bottom of the cell assembly 120 and the inner wall of the housing 110, the cross-section of the graphene film 131 perpendicular to the thickness direction is the cross-section of the graphene film 131. It is understood that... Figure 1 The height direction is the same as the thickness direction of the graphene film 131.

[0070] The cross-sectional area of ​​the graphene film 131 perpendicular to its thickness direction is greater than or equal to the area of ​​the side of the battery cell assembly 120 facing the heat-conducting layer 130. This increases the cross-sectional area of ​​the graphene film 131, allowing the heat generated by the battery cell assembly 120 to be transferred to the graphene film 131 through the side of the battery cell assembly 120 facing the heat-conducting layer 130, thus improving heat exchange efficiency. Furthermore, the heat transferred to the graphene film 131 can be rapidly dispersed around the graphene film 131 perpendicular to its thickness direction, reducing the temperature difference between the battery cell 121 in the middle and the battery cells 121 on both sides during heating or cooling of the battery pack 100. This prevents local overheating of the battery pack 100 and thermal runaway, significantly improving the battery efficiency of the battery pack 100 and extending its service life.

[0071] Moreover, the increased cross-sectional area of ​​the graphene film 131 also helps to improve the heat exchange effect between the graphene film 131 and the housing 110, thereby improving the heat dissipation efficiency of the battery pack 100.

[0072] In some embodiments, the thermally conductive layer 130 may optionally be attached to the battery cell assembly 120 on one side facing the battery cell assembly 120.

[0073] In this embodiment, the side of the thermally conductive layer 130 facing the battery cell assembly 120 is attached to the battery cell assembly 120, so that the heat generated by the battery cell assembly 120 can be transferred to the graphene film layer 131 as much as possible, significantly improving the heat exchange efficiency.

[0074] Moreover, the heat transferred to the graphene film 131 can be rapidly dispersed to the periphery of the graphene film 131 in the direction perpendicular to its thickness, reducing the temperature difference between the central cell 121 and the cells 121 on both sides of the battery pack 100 during heating or cooling, thus preventing local overheating and thermal runaway in the battery pack 100, significantly improving the battery efficiency of the battery pack 100, and extending the service life of the battery pack 100.

[0075] In some embodiments, optionally, the side of the thermally conductive layer 130 facing away from the cell assembly 120 is attached to the inner wall of the housing 110.

[0076] In this embodiment, the side of the thermally conductive layer 130 facing away from the battery cell assembly 120 is attached to the inner wall of the housing 110. It can be understood that the heat generated by the battery cell assembly 120 is transferred to the graphene film layer 131, where it rapidly disperses laterally, and then transferred to the housing 110. Heat exchange occurs between the housing 110 and the external environment, achieving heat dissipation. By attaching the thermally conductive layer 130 to the inner wall of the housing 110, heat exchange efficiency is improved, thereby enhancing the heat dissipation effect.

[0077] like Figure 1 As shown, in some embodiments, the battery pack 100 may optionally include an adapter plate 140, which is electrically connected to the cell assembly 120; wherein, along the height direction of the cell assembly 120, the adapter plate 140 and the heat-conducting layer 130 are located on opposite sides of the cell assembly 120.

[0078] In this embodiment, the battery pack 100 further includes an adapter plate 140, specifically, the adapter plate 140 is electrically connected to the cell assembly 120. The adapter plate 140 and the thermally conductive layer 130 are located on opposite sides of the cell assembly 120 in the height direction. Optionally, the adapter plate 140 is located at the top of the cell assembly 120, and the thermally conductive layer 130 is located at the bottom of the cell assembly 120. Alternatively, the adapter plate 140 is located at the bottom of the cell assembly 120, and the thermally conductive layer 130 is located at the top of the cell assembly 120. The specific configuration can be adjusted according to actual needs.

[0079] By distributing the adapter plate 140 and the heat-conducting layer 130 on both sides of the height direction of the cell assembly 120, the heat dissipation effect of the cell assembly 120 can be ensured while the structure of the battery pack 100 can be reasonably arranged, thereby improving the space utilization rate inside the battery pack 100.

[0080] like Figure 1 As shown, in some embodiments, optionally, the battery cell assembly 120 includes a plurality of battery cells 121, and a thermally conductive layer 130 is disposed between each battery cell 121 and the inner wall of the housing 110.

[0081] In this embodiment, the cell assembly 120 is defined to include a plurality of cells 121, and optionally, the plurality of cells 121 are arranged along the width direction of the cell assembly 120.

[0082] The heat-conducting layer 130 is disposed between each cell 121 and the inner wall of the housing 110, thereby ensuring that each cell 121 is in full contact with the heat-conducting layer 130 for heat exchange, which is beneficial to improving the heat dissipation effect of the battery pack 100.

[0083] Moreover, when the heat generated by multiple cells 121 is transferred to the graphene film 131, the heat is rapidly transferred in the direction perpendicular to the thickness of the graphene film 131 and dispersed to the periphery of the graphene film 131, making the overall temperature of the graphene film 131 approximately the same. This rapid heat dissipation reduces the temperature difference between the cells 121 in the middle and the cells 121 on both sides of the battery pack 100 during heating or cooling, improves the overall temperature consistency of the battery pack 100, avoids local overheating and thermal runaway, significantly improves the battery efficiency of the battery pack 100, and extends the service life of the battery pack 100.

[0084] like Figure 1 As shown, in some embodiments, optionally, the housing 110 includes a housing body 112 and two end plates 113. Along the width direction of the cell assembly 120, the two end plates 113 are respectively located on both sides of the cell assembly 120, and the two end plates 113 and the housing body 112 enclose a receiving cavity 111. The heat-conducting layer 130 is disposed between the inner wall of the housing body 112 and the cell assembly 120; and / or the heat-conducting layer 130 is disposed between the inner wall of at least one end plate 113 and the cell assembly 120.

[0085] In this embodiment, the housing 110 is defined to include a housing body 112 and two end plates 113. Specifically, along the width direction of the cell assembly 120, the two end plates 113 are located on both sides of the cell assembly 120.

[0086] A heat-conducting layer 130 is disposed between the inner wall of the housing 112 and the cell assembly 120. Alternatively, the heat-conducting layer 130 is disposed between the inner wall of one of the end plates 113 and the cell assembly 120. Alternatively, the heat-conducting layer 130 is disposed between the inner wall of each end plate 113 and the cell assembly 120. Alternatively, a heat-conducting layer 130 is disposed between the inner wall of the housing 112 and the cell assembly 120, and also between the inner wall of each end plate 113 and the cell assembly 120. These are not all listed here. The specific configuration can be determined according to actual needs.

[0087] Since at least a portion of the thermally conductive layer 130 includes a graphene film 131, and the graphene film 131 has a high thermal conductivity in the direction perpendicular to its thickness, when the heat generated by the battery cell assembly 120 is transferred to the graphene film 131, the heat is rapidly transferred in the direction perpendicular to its thickness and dispersed around the graphene film 131, making the overall temperature of the graphene film 131 approximately the same. This rapid heat dissipation reduces the temperature difference between the battery cell 121 in the middle and the battery cells 121 on both sides during the heating or cooling process of the battery pack 100, improves the overall temperature consistency of the battery pack 100, avoids local overheating of the battery pack 100 that could lead to thermal runaway, significantly improves the battery efficiency of the battery pack 100, and extends the service life of the battery pack 100.

[0088] In some embodiments, the thickness d of the graphene film 131 may optionally satisfy 12μm≤d≤100μm.

[0089] In this embodiment, the thickness of the graphene film 131 is limited to a specific range. Specifically, the thickness of the graphene film 131 is between 12 μm and 100 μm to ensure heat dissipation.

[0090] According to a second aspect of the present invention, a battery module is provided, including a battery pack 100 as provided in any of the above embodiments, and thus possessing all the beneficial technical effects of the battery pack 100, which will not be repeated here.

[0091] According to a third aspect of the present invention, an energy storage device is provided, comprising a battery pack 100 or a battery module as provided in any of the above embodiments, and thus possessing all the beneficial technical effects of the battery pack 100 or the battery module, which will not be repeated here.

[0092] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0093] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing has a receiving cavity; The battery cell assembly is disposed within the receiving cavity; A thermally conductive layer is disposed between the inner wall of the housing and the battery cell assembly for heat exchange with the battery cell assembly, and at least a portion of the thermally conductive layer includes a graphene film layer. The thermally conductive layer is attached to one side of the battery cell assembly facing the battery cell assembly.

2. The battery pack according to claim 1, characterized in that, The cross-sectional area of ​​the graphene film layer perpendicular to the thickness direction is greater than or equal to the area of ​​one side of the battery cell assembly facing the thermal conductive layer.

3. The battery pack according to claim 1 or 2, characterized in that, The side of the thermally conductive layer facing away from the battery cell assembly is in contact with the inner wall of the housing.

4. The battery pack according to claim 1 or 2, characterized in that, Also includes: The adapter board is electrically connected to the battery cell assembly; Along the height direction of the battery cell assembly, the adapter plate and the thermal conductive layer are located on opposite sides of the battery cell assembly.

5. The battery pack according to claim 1 or 2, characterized in that, The battery cell assembly includes multiple battery cells, and the thermally conductive layer is disposed between each battery cell and the inner wall of the housing.

6. The battery pack according to claim 1 or 2, characterized in that, The housing includes: Shell body; Two end plates are located on both sides of the battery cell assembly along the width direction of the battery cell assembly, and the two end plates and the shell body enclose the receiving cavity. The thermally conductive layer is disposed between the inner wall of the shell body and the battery cell assembly; and / or the thermally conductive layer is disposed between the inner wall of at least one end plate and the battery cell assembly.

7. The battery pack according to claim 1 or 2, characterized in that, The thickness d of the graphene film satisfies 12μm≤d≤100μm.

8. A battery module, characterized in that, Includes the battery pack as described in any one of claims 1 to 7.

9. An energy storage device, characterized in that, include: The battery pack as described in any one of claims 1 to 7; or The battery module as described in claim 8.

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