Battery module and energy storage device with same

Abstract

The utility model provides a battery module and an energy storage device with the same. The battery module comprises N sub-modules and N + 1 heat insulation buffer layers. Each sub-module comprises M heating layers and M + 1 battery units. The N sub-modules and the N + 1 heat insulation buffer layers are alternately stacked in the stacking direction, so that one sub-module is arranged between any two adjacent heat insulation buffer layers. The M heating layers and the M + 1 battery units are alternately stacked along the stacking direction, so that one heating layer is arranged between any two adjacent battery units. Here, N > = 2 and M > = 1. In a low-temperature environment, the heating layer between the two adjacent battery units can heat the sub-modules, so that the battery units can operate in a proper temperature range, and the performance and the stability of the battery units are ensured. The plurality of sub-modules and the plurality of heat insulation buffer layers are alternately stacked along the stacking direction, so that heat transfer between the sub-modules or between the sub-modules and the external environment can be reduced, and the temperature in the battery module is ensured to be relatively uniform.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery module and an energy storage device having therein. Background Technology

[0002] With the development of battery technology, more and more devices incorporating battery modules have been launched on the market. Taking energy storage devices as an example, they can meet daily power needs or serve as emergency power sources to provide power backup during power outages. In low-temperature environments, the performance of battery modules is often significantly affected, causing them to malfunction. To adapt battery modules to low-temperature conditions, they can be heated; however, due to the structural limitations of battery modules, uneven heating occurs during the heating process. Utility Model Content

[0003] In view of this, the present invention provides a battery module and an energy storage device having the same, aiming to solve the problem of uneven heating during the heating process of the battery module in a low-temperature environment.

[0004] The battery module provided in this embodiment includes N sub-modules and N+1 heat insulation buffer layers. Each sub-module includes M heating layers and M+1 battery cells. Each battery cell includes at least one battery cell. The M heating layers and M+1 battery cells are stacked alternately along the stacking direction, and a heating layer is provided between any two adjacent battery cells. Wherein, N≥2 and M≥1, the N sub-modules and N+1 heat insulation buffer layers are stacked alternately along the stacking direction, and a sub-module is provided between any two adjacent heat insulation buffer layers.

[0005] In one possible implementation, the thermal insulation buffer layer is at least one of a foam layer, an aerogel layer, or a vacuum layer.

[0006] In one possible implementation, the battery module further includes a protective pad disposed on at least one side of the N sub-modules in the stacking direction. The protective pad includes a first sub-protective pad and a second sub-protective pad. The first sub-protective pad is flat, and the second sub-protective pad includes a first protective portion, a second protective portion, and a third protective portion that are sequentially connected and bent into a stepped shape. Each cell includes a main body portion and a top seal portion. The main body portion has a first surface facing the protective pad and a second surface facing the top seal portion, and the top seal portion has a third surface facing the protective pad. The first sub-protective pad is attached to the first surface, the first protective portion is attached to the first surface and partially overlaps with the first sub-protective pad, the second protective portion is attached to the second surface, and the third protective portion is attached to the third surface.

[0007] On the other hand, this utility model embodiment provides an energy storage device, which includes the battery module and the housing mentioned above. The housing has two storage cavities that are separated from each other. The two battery modules are electrically connected to each other and are respectively stored in the two storage cavities.

[0008] In one possible implementation, the housing includes a first housing and a second housing arranged along a stacking direction and detachably connected. Each of the first housing and the second housing has a recessed portion that is recessed toward the other. The two recessed portions cooperate to form a partition that separates two storage cavities. Each recessed portion includes two side plate portions arranged at intervals in its thickness direction and a bottom plate portion that connects to the two side plate portions. The two side plate portions and the bottom plate portion together form a heat dissipation channel communicating with the external space of the housing.

[0009] In one possible implementation, the heat dissipation channel is provided with multiple ribs spaced apart along the length of the heat dissipation channel, and the two side plates and the bottom plate are connected to each rib.

[0010] In one possible implementation, the distance between the two side plates gradually decreases as they approach the bottom plate.

[0011] In one possible implementation, the two base plates of the first and second housings are fixedly connected.

[0012] In one possible implementation, each housing includes a first housing and a second housing arranged along a stacking direction and detachably connected. The first housing has two first storage portions recessed away from the second housing, and the second housing has a second storage portion recessed away from the first housing. Each first storage portion and the corresponding second storage portion together form a corresponding storage cavity. Each of the first storage portion and the second storage portion has a bottom wall surface and a plurality of side wall surfaces disposed around the bottom wall surface. The bottom wall surface and / or the side wall surfaces are provided with heat-insulating cushioning pads.

[0013] In one possible implementation, the first housing includes a first connecting portion disposed on the periphery of two first storage portions, and the second housing includes a second connecting portion disposed on the periphery of two second storage portions. The first connecting portion and the second connecting portion are fixedly connected and form a gap between them. A heat insulation buffer layer of each battery module at least partially overlaps with the gap in the stacking direction.

[0014] According to the battery module and energy storage device provided in this embodiment, a heating layer is provided between two adjacent battery cells in each sub-module. In low-temperature environments, the heating layer can heat the sub-module, enabling the battery cells to operate within a suitable temperature range, thus ensuring the performance and stability of the battery cells. Multiple sub-modules and multiple heat-insulating buffer layers are alternately stacked along the stacking direction. The heat-insulating buffer layer located between two sub-modules can prevent heat transfer between the two sub-modules, reducing heat interference between them. The heat-insulating buffer layers located on both sides of the battery module in the stacking direction can prevent heat dissipation from the battery module to the external space, thus ensuring a relatively uniform temperature inside the battery module. This implementation ensures the performance and stability of the battery module in low-temperature environments and reduces heat transfer between sub-modules or between the sub-module and the external environment, ensuring a relatively uniform temperature inside the battery module. Attached Figure Description

[0015] Figure 1 This is an exploded view of a battery module according to an embodiment of the present invention.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the battery cell and protective pad in the battery module.

[0017] Figure 3 This is an exploded view of an energy storage device according to an embodiment of the present invention.

[0018] Figure 4 for Figure 3 A schematic diagram of the shell structure.

[0019] Figure 5 for Figure 3 A schematic diagram of the energy storage device in the diagram.

[0020] Figure 6 for Figure 3 A schematic diagram of the casing of the energy storage device.

[0021] Figure 7 for Figure 6 A top view of the casing of the energy storage device.

[0022] Figure 8 for Figure 3 A schematic diagram of the energy storage device after the casing has been removed. Detailed Implementation

[0023] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0024] A battery module is a battery assembly consisting of multiple battery cells connected in series or parallel. It can be used in various devices to provide power. For example, battery modules can be used in energy storage devices and electric vehicles. Taking a home energy storage device as an example, it can meet daily power needs or serve as an emergency power source to provide power during power outages.

[0025] In practical use, battery modules may face low-temperature environments, requiring heating to ensure normal operation. The stacked structure of multiple battery cells within a module affects heat distribution and dissipation, causing cells near the center to heat up too quickly, while those near the outer edges heat up more slowly. This can lead to several unforeseen consequences. For example, if the central battery cell heats up too quickly, it may cause failure and safety hazards.

[0026] To address the issue of uneven heating during the heating of battery modules in low-temperature environments, this invention provides a battery module and an energy storage device incorporating it. Examples of the battery module and energy storage device provided in this invention are described below.

[0027] Exemplary battery module

[0028] According to an embodiment of the present invention, the battery module 10 is in... Figure 1 As shown in the diagram. In some examples, battery module 10 can be used in energy storage devices, particularly home energy storage devices. In other examples, battery module 10 can also be used in other devices, such as automobiles, power tools, energy storage stations, or home appliances.

[0029] refer to Figure 1 The battery module 10 may include N sub-modules 11 and N+1 heat insulation buffer layers 12. The N sub-modules 11 and N+1 heat insulation buffer layers 12 are stacked alternately along the stacking direction, such that a sub-module 11 is provided between any two adjacent heat insulation buffer layers 12. Each sub-module 11 includes M heating layers 111 and M+1 battery cells 112, which are stacked alternately along the stacking direction, such that a heating layer 111 is provided between any two adjacent battery cells 112. Here, N≥2 and M≥1.

[0030] According to the battery module 10 provided in this embodiment of the present invention, a heating layer 111 is provided between two adjacent battery cells 112 in each sub-module 11. In a low-temperature environment, the heating layer 111 can heat the sub-module 11, enabling the battery cells 112 to operate within a suitable temperature range, thereby ensuring the performance and stability of the battery cells 112. Multiple sub-modules 11 and multiple heat-insulating buffer layers 12 are stacked alternately along the stacking direction. The heat-insulating buffer layer 12 located between two sub-modules 11 can prevent heat transfer between the two sub-modules 11, reducing heat interference between them. The heat-insulating buffer layers 12 located on both sides of the battery module 10 in the stacking direction can prevent heat from escaping from the inside of the battery module 10 to the external space, thus ensuring a relatively uniform temperature inside the battery module 10. This implementation ensures the performance and stability of the battery module 10 in a low-temperature environment and reduces heat transfer between sub-modules 11 or between a sub-module 11 and the external environment, thereby ensuring a relatively uniform temperature inside the battery module 10.

[0031] It should be noted that in other embodiments of this utility model, N and M may also take other values. That is, the battery module 10 may include 3 or more sub-modules 11 and 4 or more heat insulation buffer layers 12; each sub-module 11 may include 3 or more battery cells 112 and 2 or more heating layers 111.

[0032] It is understood that in this utility model, directional descriptions such as "stack direction" are relative rather than absolute. These directional descriptions apply when the elements in this disclosure are in the placement posture and position shown in the figures. It should be noted that in the figures of the embodiments of this utility model, arrows Z+ and Z- are used to indicate the first direction, that is, the opposite sides of the stack direction; arrows X+ and X- are used to indicate the opposite sides of the second direction, which is perpendicular to the first direction, and the width direction of the heat dissipation channel mentioned below is parallel to the second direction; arrows Y+ and Y- are used to indicate the opposite sides of the third direction, which is perpendicular to both the first and second directions, and the length direction of the heat dissipation channel mentioned below is parallel to the third direction.

[0033] As one possible implementation, the heat insulation buffer layer 12 can be a foam layer. The foam layer has good heat insulation properties, thus reducing heat transfer between sub-modules 11 or between sub-modules 11 and the external environment. Furthermore, the foam layer is elastic, so when a sub-module 11 expands during charging or discharging, the heat insulation buffer layer 12 can also accommodate the protruding portion of the sub-module 11, preventing it from contacting other components and causing damage. Of course, in some other embodiments, the heat insulation buffer layer 12 can be an aerogel layer or a vacuum layer. Aerogels are typically made of materials such as silica, carbon, or metal oxides, and have the advantages of being lightweight and having good heat insulation properties. Vacuum layers, because there is no air or gas to transfer heat, have extremely low thermal conductivity and can effectively block heat conduction. It is understood that there are many choices of materials for the heat insulation buffer layer 12, and this embodiment of the invention does not impose any particular limitation on this.

[0034] refer to Figure 1 Each battery cell 112 may include two cells 1120. As an example, the cells 1120 may be pouch cells. Figure 2 A schematic diagram of the 1120 battery cell is shown. (See attached diagram) Figure 2 The battery cell 1120 may include a main body 1121 and a top sealing part 1122.

[0035] The main body 1121, serving as the primary area for energy storage and chemical reactions, is the core component of the battery cell 1120. The main body 1121 typically includes a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode reversibly absorbs and releases charge carriers (electrons in metals, ions in electrolytes). The positive electrode material can be lithium cobalt oxide (LiCoO2), lithium nickel cobalt manganese oxide (NCM), or lithium iron phosphate (LiFePO4). The negative electrode reversibly absorbs and releases charge carriers. The negative electrode material can be graphite or silicon-based. The electrolyte provides an ion channel between the positive and negative electrodes; for example, the electrolyte can be an organic solvent containing lithium salts. The separator, located between the positive and negative electrodes, isolates them to prevent short circuits while allowing ion flow. When the battery discharges, the negative electrode material releases electrons, which flow to the positive electrode through the external circuit, forming an electric current. Ions in the electrolyte migrate from the negative electrode to the positive electrode inside the cell. When the cell is charged, electrons flow back from the positive electrode to the negative electrode, while ions in the electrolyte return from the positive electrode to the negative electrode.

[0036] The top seal 1122 is located on one side of the main body 1121 and seals the main body 1121, thereby protecting the positive and negative electrode materials and other chemical components in the main body 1121 from the influence of the external environment. (Continue to refer to...) Figure 1 and Figure 2The top cover 1122 is also provided with tabs 1123. The battery module 10 includes a tab bracket 14 and a bus (not marked in the figure). The tabs 1123 are supported by the tab bracket 14. The bus is electrically connected to multiple cells 1120 and forms positive and negative output terminals for the cells 1120.

[0037] It is understood that there are many ways to electrically connect the busbar to the tab 1123 of the battery cell 1120, such as by welding or crimping. This utility model does not impose any particular limitation on this.

[0038] refer to Figure 1 The battery module 10 includes two protective pads 13, which are respectively disposed on both sides of the N sub-modules in the stacking direction. It can be understood that in some embodiments, there may be only one protective pad 13, and the protective pad 13 may be disposed on any side of the N sub-modules in the stacking direction.

[0039] refer to Figure 1 and Figure 2 The protective pad may include a first sub-protective pad 131 and a second sub-protective pad 132. The first sub-protective pad 131 is flat, and the second sub-protective pad 132 includes a first protective portion 1321, a second protective portion 1322, and a third protective portion 1323 that are sequentially connected and bent into a stepped shape. The main body 1121 has a first surface 1121-a facing the protective pad 13 and a second surface 1121-b facing the top sealing portion 1122. The top sealing portion 1122 has a third surface 1122-a facing the protective pad. The first sub-protective pad 131 is attached to the first surface 1121-a, the first protective portion 1321 is attached to the first surface 1121-a and partially overlaps with the first sub-protective pad 131, the second protective portion 1322 is attached to the second surface 1121-b, and the third protective portion 1323 is attached to the third surface 1122-a.

[0040] According to an embodiment of this utility model, the first sub-protective pad 131 can separate the entire sub-module from external components, such as the housing of the battery module 10 (the specific structure will be described below). In this way, when the battery cell 1120 in the sub-module 11 expands during charging and discharging, the first sub-protective pad 131 can prevent the battery cell 1120 from directly contacting the housing, thus reducing the risk of short circuits caused by damage to the battery cell 1120. Furthermore, since the second sub-protective pad 132, bent into a stepped shape, is attached to the top seal portion 1122 of the battery cell 112, the second sub-protective pad 132 can limit the expansion range of the top seal portion 1122 after its second surface 1121-b expands away from the main body portion 1121, thereby ensuring that the seal between the top seal portion 1122 and the main body portion 1121 is not compromised.

[0041] Optionally, the first sub-protective pad 131 and the second sub-protective pad 132 can be integrally molded, which can improve the fit and matching between the protective pad 13 and the battery module 10, and reduce the number of processes to improve manufacturing efficiency.

[0042] It is understood that the material of the protective pad 13 can be polycarbonate (PC) or polyvinyl fluoride (PTFE). Both polycarbonate (PC) and polyvinyl fluoride (PTFE) have good compressive strength, and also have advantages such as ease of processing and low cost. Of course, other materials can also be used for the protective pad 13, and this utility model does not impose any particular restrictions on this.

[0043] Exemplary energy storage device

[0044] This embodiment of the invention also provides an energy storage device 100, which in... Figures 3 to 8 As shown in the image.

[0045] The energy storage device 100 includes the battery module 10 described above. As an example, the energy storage device 100 can be a home energy storage device. Of course, in other embodiments, the energy storage device 100 can also serve as a power source. In one example, the energy storage device 100 may include two battery modules 10 connected in series. Of course, in other examples, the number of battery modules 10 can be one, three, or more, and this invention does not impose any particular limitation on this.

[0046] refer to Figure 3 and Figure 4 The energy storage device 100 also includes a housing 20, within which are two separate storage cavities 21. Two battery modules 10 are electrically connected to each other and are respectively housed in the two storage cavities 21. When the two battery modules 10 are placed side-by-side, heat transfer between them can cause each battery module 10 to have a higher temperature on the side closest to the other. This heat accumulation can lead to localized overheating, affecting the battery module 10's performance. According to this embodiment, each battery module 10 has its own independent space. This allows less heat generated by each battery module during charging and discharging to be transferred to the other battery module, thereby reducing the possibility of mutual interference between the two battery modules 10 and lowering the risk of localized overheating.

[0047] refer to Figure 3 and Figure 4The housing 20 may include a first housing 22 and a second housing 23 arranged along a stacking direction and detachably connected. Each of the first housing 22 and the second housing 23 has a recessed portion 24 that is recessed toward the other. The two recessed portions 24 cooperate to form a partition 25 separating two storage cavities 21. Each recessed portion 24 includes two side plate portions 251 arranged at intervals in its thickness direction, i.e., a first direction, and a bottom plate portion 252 connected to the two side plate portions 251. Figure 5 The two side plates 251 and the bottom plate 252 together form a heat dissipation channel 26 communicating with the external space of the housing. According to this embodiment, the two battery modules 10 are respectively housed in two receiving cavities 21, with the recessed portion 24 located between the two receiving cavities 21. Thus, when either battery module 10 transfers heat generated during charging or discharging to the other battery module 10, the heat is first transferred to the recessed portion 24. The two side plates 251 and the bottom plate 252 of the recessed portion 24 together form a heat dissipation channel 26 communicating with the external space of the housing 20, allowing heat to dissipate into the external space after passing through the heat dissipation channel 26. This implementation avoids overheating of the battery modules 10, thereby ensuring the safety of the battery modules 10.

[0048] refer to Figure 5 and Figure 6 The heat dissipation channel 26 is provided with a plurality of ribs 27 arranged at intervals along the length direction of the heat dissipation channel 26, i.e., the third direction. The two side plate portions 251 and the bottom plate portion 252 are connected to each rib 27. The ribs 27 can support the two side plate portions 251 in the length direction, enhance the connection strength between the two side plate portions 251 and between the two side plate portions 251 and the bottom plate portion 252, and help improve the stability of the overall structure.

[0049] Continue to refer to Figure 4 The distance between the two side plate portions 251 gradually decreases as it approaches the bottom plate portion 252. According to the embodiment of the present invention, the two side plate portions 251 are inclined along the stacking direction, and when the separator portion 25 is formed by molding, the mold located between the two side plate portions 251 can easily exit in a direction away from the bottom plate portion 252.

[0050] Continue to refer to Figure 4 The bottom plate portion 252a of the first housing 22 and the bottom plate portion 252b of the second housing 23 are fixedly connected. In this way, the first housing 22 can form a new support structure within the housing 20, namely the bottom plate portion 252a, to support the bottom plate portion 252b, which allows the first housing 22 to stably support the second housing 23. Furthermore, when the number of storage cavities 21 in the housing 20 exceeds two, a bottom plate portion can be provided between every two storage cavities 21 to enhance the overall structural strength of the housing 20.

[0051] It is understood that there are many ways to fix the bottom plate portion 252a of the first housing 22 and the bottom plate portion 252b of the second housing 23. For example, the two bottom plates can be connected by screws or glued. This utility model does not impose any particular limitation on this.

[0052] refer to Figure 6 and Figure 7 The first housing 22 has two first storage portions 211 recessed away from the second housing 23, and the second housing 23 has a second storage portion 212 recessed away from the first housing 22. Each first storage portion 211 and the corresponding second storage portion 212 together form a corresponding storage cavity 21. Each of the first storage portions 211 and the second storage portions 212 has a bottom wall surface 213 and a plurality of side wall surfaces 214 disposed around the bottom wall surface 213. Each side wall surface 214 is provided with a heat-insulating buffer pad 28. According to an embodiment of the present invention, the heat-insulating buffer pad 28 includes one heat-insulating buffer pad 28a and three heat-insulating buffer pads 28b. The two storage cavities 21 respectively house two battery modules 10. The heat-insulating buffer pad 28a is located on the side of each storage cavity 21 facing the other storage cavity 21, thus blocking heat transfer between the two battery modules 10 and reducing heat interference between the battery modules 10. Three heat-insulating buffer pads 28b are respectively disposed on the three side walls 214 of the battery module 10 facing the external space. Therefore, the three heat-insulating buffer pads 28b can prevent the heat inside the battery module 10 from dissipating to the external space, ensuring that the temperature inside the battery module 10 is relatively uniform.

[0053] refer to Figure 6 and Figure 8 The first housing 22 may include a first connecting portion 221 disposed around the two first storage portions 211, and the second housing 23 may include a second connecting portion 231 disposed around the two second storage portions 212. Figure 4 The first connecting portion 221 and the second connecting portion 231 are fixedly connected, forming a gap 29 between them. A heat-insulating buffer layer 12 of each battery module 10 at least partially overlaps the gap 29 in the stacking direction. That is, after each battery module 10 is installed in its corresponding receiving cavity 21, a heat-insulating buffer layer 12 of each battery module 10 and the gap 29 between the first housing 22 and the second housing 23 are located on the same plane. In this way, a portion of the heat-insulating buffer layer 12 can fill the gap 29, making the receiving cavity 21 a closed space, thereby preventing heat from escaping from the inside of the battery module 10 to the external space. Furthermore, through structural design, the heat-insulating buffer layer 12 can fill the gap 29 without the need for additional heat-insulating materials. This implementation also reduces the number of components in the energy storage device 100 and lowers production costs.

[0054] It is understood that there are many ways to fix the first connecting part 221 and the second connecting part 231, and this utility model does not impose any particular limitation on this. For example, the first connecting part 221 and the second connecting part 231 can be fixed by screw connection or welding.

[0055] It should be understood that the term "comprising" and its variations used in the embodiments of this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment". The term "a plurality of" means "more than one", which means covering two, three or more cases.

[0056] It should be understood that although terms such as "first" or "second" may be used in embodiments of the present invention to describe various elements, such as a first sub-insulating pad and a second sub-insulating pad, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0057] The protection scope of this utility model embodiment is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model embodiment should be included within the protection scope of this utility model embodiment. Therefore, the protection scope of this utility model embodiment should be determined by the protection scope of the claims.

Claims

1. A battery module, characterized in that, include: N sub-modules, each sub-module comprising M heating layers and M+1 battery cells, each battery cell comprising at least one battery cell, the M heating layers and M+1 battery cells being stacked alternately along a stacking direction, with a heating layer between any two adjacent battery cells, wherein N≥2 and M≥1; and N+1 heat insulation buffer layers, N sub-modules and N+1 heat insulation buffer layers are stacked alternately along the stacking direction, and a sub-module is provided between any two adjacent heat insulation buffer layers.

2. The battery module according to claim 1, characterized in that, The heat insulation buffer layer is at least one of foam layer, aerogel layer or vacuum layer.

3. The battery module according to claim 1 or 2, characterized in that, It also includes a protective pad, which is disposed on at least one side of the N sub-modules as a whole in the stacking direction. The protective pad includes a first sub-protective pad and a second sub-protective pad. The first sub-protective pad is flat, and the second sub-protective pad includes a first protective part, a second protective part, and a third protective part that are connected in sequence and bent into a stepped shape. Each of the battery cells includes a body portion and a top seal portion; the body portion has a first surface facing the protective pad and a second surface facing the top seal portion, the top seal portion has a third surface facing the protective pad; a first sub-protective pad is attached to the first surface, a first protective portion is attached to the first surface and partially overlaps with the first sub-protective pad, a second protective portion is attached to the second surface, and a third protective portion is attached to the third surface.

4. An energy storage device, characterized in that, include: According to any one of the two battery modules in claim 1 to 3; as well as The housing has two separate storage cavities inside, and the two battery modules are electrically connected to each other and are respectively stored in the two storage cavities.

5. The energy storage device according to claim 4, characterized in that, The housing includes a first housing and a second housing arranged along the stacking direction and detachably connected. Each of the first housing and the second housing has a recessed portion that is recessed toward the other. The two recessed portions cooperate to form a partition that separates the two storage cavities. Each recess includes two side plates spaced apart in its thickness direction and a bottom plate that connects to the two side plates. The two side plates and the bottom plate together form a heat dissipation channel communicating with the external space of the housing.

6. The energy storage device according to claim 5, characterized in that, The heat dissipation channel is provided with a plurality of ribs arranged at intervals along the length of the heat dissipation channel, and the two side plates and the bottom plate are connected to each of the ribs.

7. The energy storage device according to claim 5, characterized in that, The distance between the two side plates gradually decreases as they approach the bottom plate.

8. The energy storage device according to claim 5, characterized in that, The two bottom plates of the first housing and the second housing are fixedly connected.

9. The energy storage device according to claim 4, characterized in that, Each of the housings includes a first housing and a second housing arranged along the stacking direction and detachably connected, the first housing having two first storage portions recessed away from the second housing, and the second housing having a second storage portion recessed away from the first housing; Each of the first storage section and the corresponding second storage section together form the corresponding storage cavity. Each of the first storage section and the second storage section has a bottom wall surface and a plurality of side wall surfaces disposed around the bottom wall surface. The bottom wall surface and / or the side wall surfaces are provided with heat insulation cushioning pads.

10. The energy storage device according to claim 9, characterized in that, The first housing includes a first connecting portion disposed on the periphery of the two first storage portions, and the second housing includes a second connecting portion disposed on the periphery of the two second storage portions. The first connecting portion and the second connecting portion are fixedly connected and form a gap between them. One of the heat insulation buffer layers of each battery module at least partially overlaps the gap in the stacking direction.

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