Thermoelectric refrigeration device and household energy storage equipment

Abstract

The utility model discloses a thermoelectric refrigeration device and household energy storage equipment. The thermoelectric refrigeration device comprises a first heat dissipation part, a second heat dissipation part, a heat pipe and a thermoelectric refrigeration part. The thermoelectric refrigeration part comprises a cold end and a hot end, the cold end of the thermoelectric refrigeration part is connected with a battery module of the household energy storage equipment, and the hot end of the thermoelectric refrigeration part is connected with the first heat dissipation part; the first heat dissipation part is connected with the second heat dissipation part through a heat pipe; and the second heat dissipation part is connected with a box body back plate of the household energy storage equipment. The heat dissipation efficiency of the household energy storage battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a thermoelectric refrigeration device and a household energy storage device. Background Art

[0002] At present, the household energy storage market is gradually emerging. With the large-scale development of renewable energy and the government's support for energy storage technology, more and more households are beginning to pay attention to and adopt energy storage technology. There are several thermal management solutions for household energy storage battery systems in the prior art: natural cooling solution, that is, through the natural convection of the air inside the box, the heat of the battery is transferred to the outer shell of the box to cool the battery; forced air cooling solution, that is, adding a fan in the box to force the internal air to flow, thereby increasing the convection heat transfer coefficient and achieving the purpose of enhancing heat dissipation; phase change material solution, that is, adding phase change material between the battery cells, and the phase change material absorbs part of the heat.

[0003] However, the natural cooling solution cannot meet the high-power heat dissipation requirements of the battery due to the low heat transfer coefficient of natural convection and low heat transfer efficiency. The forced air cooling solution adds a fan inside the box, but due to the small heat capacity of air and the limited space inside the box, the heat transfer efficiency of this solution is still low, and it also brings noise problems. The phase change material solution can only play the role of high-temperature peak shaving due to the limited volume of the phase change material and the limited heat absorption. The problem of low overall heat transfer efficiency has not yet been solved, so it cannot meet the high-power heat dissipation requirements of the battery. Therefore, how to improve the heat dissipation efficiency of household energy storage batteries is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a thermoelectric refrigeration device that can improve the heat dissipation efficiency of household energy storage batteries.

[0005] In a first aspect, according to some embodiments, the present application provides a thermoelectric cooling device, including: a first heat dissipation component, a second heat dissipation component, a heat pipe, and a thermoelectric cooling component;

[0006] The thermoelectric refrigeration component comprises a cold end and a hot end, the cold end of the thermoelectric refrigeration component is connected to the battery module of the household energy storage device, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component;

[0007] The first heat dissipation component is connected to the second heat dissipation component through a heat pipe;

[0008] The second heat dissipation component is connected to the back plate of the box of the household energy storage device.

[0009] Preferably, the thermoelectric refrigeration component comprises: a semiconductor thermoelectric refrigeration plate, an electrical insulation heat conductive layer and a temperature equalizing plate;

[0010] The two ends of the semiconductor thermoelectric refrigeration plate are the cold end and the hot end respectively, and the electrical insulation and heat-conducting layers are respectively adhered to the surfaces of the cold end and the hot end;

[0011] The cold end is connected to the temperature averaging plate through the electrically insulating heat-conducting layer, and the temperature averaging plate is connected to the battery module;

[0012] The hot end is connected to the first heat dissipation component through the electrically insulating heat-conductive layer.

[0013] Preferably, the second heat dissipation component is connected to the box back plate via a structural thermal conductive adhesive.

[0014] Preferably, the thermoelectric refrigeration component further comprises: a power supply harness, wherein the power supply harness is electrically connected to the semiconductor thermoelectric refrigeration plate.

[0015] Preferably, the first heat dissipation component includes a first card slot, and the second heat dissipation component includes a second card slot. One end of the heat pipe is connected to the first heat dissipation component through the first card slot, and the other end of the heat pipe is connected to the second heat dissipation component through the second card slot. The heat pipe is used to transfer heat from the first heat dissipation component to the second heat dissipation component.

[0016] Preferably, the first heat dissipation component and the second heat dissipation component are made of aluminum alloy material.

[0017] The embodiments of the present application use a thermoelectric refrigeration component combined with a first heat dissipation component, a second heat dissipation component, and a heat pipe to form a thermoelectric refrigeration device for use in household energy storage equipment. The thermoelectric refrigeration component includes a cold end and a hot end. The cold end of the thermoelectric refrigeration component is connected to the battery module of the household energy storage equipment, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component; the first heat dissipation component is connected to the second heat dissipation component through a heat pipe; and the second heat dissipation component is connected to the back plate of the box of the household energy storage equipment. Thus, the cold end of the thermoelectric refrigeration component cools the battery module, and at the same time, the heat is transferred to the second heat dissipation component through the first heat dissipation component connected to the heat pipe, and the second heat dissipation component then transfers the heat to the back plate of the box of the household energy storage equipment, and finally dissipates the heat to the external environment atmosphere, thereby improving the heat dissipation efficiency of the household energy storage battery.

[0018] In a second aspect, according to some embodiments, the present application provides a household energy storage device, including the thermoelectric cooling device described in the first aspect above, and also including: a battery module and a box back plate.

[0019] Preferably, heat dissipation fins are provided on the back plate of the box.

[0020] Preferably, the battery module comprises: a plurality of battery cells, at least one thermally conductive graphite sheet and a module fixing module;

[0021] The thermally conductive graphite sheet is embedded between the plurality of battery cells, and the module fixing module is used to fix the plurality of battery cells clamped with the thermally conductive graphite sheet into a battery cell group.

[0022] Preferably, the module fixing module comprises: a module end plate, a module bottom plate, heat insulation cotton and a module tie;

[0023] The module bottom plate is located at the bottom of the battery cell, the heat insulation cotton is located between the battery cell and the module bottom plate, the module tie is used to fix the multiple battery cells into a battery cell group, and the module end plates are located on both sides of the battery cell group.

[0024] The embodiments of the present application provide a household energy storage device, which adds a thermoelectric cooling device and a thermally conductive graphite sheet between the battery cells of the battery module, so that the household energy storage battery can be used in a better heat dissipation environment, so that the battery can still be in a good operating temperature range under continuous charging and discharging conditions or in a high temperature environment, and the temperature uniformity is excellent, thereby achieving the purpose of extending the battery life and improving the battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic structural diagram of a thermoelectric refrigeration device in an embodiment of the present application;

[0027] Figure 2 is an enlarged schematic diagram of a thermoelectric refrigeration device in an embodiment of the present application;

[0028] Figure 3 is an enlarged structural schematic diagram of a thermoelectric refrigeration device in an embodiment of the present application;

[0029] Figure 4 is a structural schematic diagram of a household energy storage device in an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of the structure of a battery module in an embodiment of the present application;

[0031] Figure 6 is an enlarged schematic diagram of a household energy storage device in an embodiment of the present application;

[0032] Figure 7 is an enlarged structural schematic diagram of a household energy storage device in an embodiment of the present application;

[0033] Figure 8 It is a schematic diagram of the structure of the back plate of the box body in the embodiment of the present application.

[0034] Figure numerals: 10, thermoelectric cooling device; 20, battery module; 30, box back plate; 11, first heat dissipation component; 12, second heat dissipation component; 13, heat pipe; 14, thermoelectric cooling component; 141, semiconductor thermoelectric cooling plate; 142, electrical insulation heat conductive layer; 143, temperature equalizing plate; 144, power supply harness; 21, battery cell; 22, thermally conductive graphite sheet; 23, module fixing module; 231, module end plate; 232, module bottom plate; 233, thermal insulation cotton; 234, module tie. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be described below in conjunction with the accompanying drawings. The described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the description of this application, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0036] The following is a further detailed description of a thermoelectric cooling device provided by this embodiment in conjunction with the accompanying drawings. Figure 1 A thermoelectric refrigeration device 10 includes: a first heat dissipation component 11, a second heat dissipation component 12, a heat pipe 13 and a thermoelectric refrigeration component 14; the thermoelectric refrigeration component 14 includes a cold end and a hot end, the cold end of the thermoelectric refrigeration component 14 is connected to the battery module 20 of the household energy storage device, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component 11; the first heat dissipation component 11 is connected to the second heat dissipation component 12 through the heat pipe 13; the second heat dissipation component 12 is connected to the box back plate 30 of the household energy storage device.

[0037] The embodiment of the present application adopts a thermoelectric refrigeration component with high efficiency, small size and simple structure, combined with a first heat dissipation component 11, a second heat dissipation component 12 and a heat pipe 13 to form a thermoelectric refrigeration device for household energy storage equipment. The thermoelectric refrigeration component 14 includes a cold end and a hot end. The cold end of the thermoelectric refrigeration component 14 is connected to the battery module 20 of the household energy storage equipment, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component 11; the first heat dissipation component 11 is connected to the second heat dissipation component 12 through the heat pipe 13; the second heat dissipation component 12 is connected to the back plate 30 of the box of the household energy storage equipment. Thus, the cold end of the thermoelectric refrigeration component cools the battery module, and at the same time, the heat is transferred to the second heat dissipation component through the first heat dissipation component connected to the heat pipe, and the second heat dissipation component then transfers the heat to the back plate of the box of the household energy storage equipment, and finally dissipates the heat to the external environment atmosphere, thereby improving the heat dissipation efficiency of the household energy storage battery.

[0038] In an optional embodiment, the thermoelectric cooling component 14 includes: a semiconductor thermoelectric cooling plate 141, an electrically insulating heat conductive layer 142 and a temperature equalizing plate 143; the two ends of the semiconductor thermoelectric cooling plate 14 are respectively a cold end and a hot end, and the electrically insulating heat conductive layer 142 is respectively adhered to the surface of the cold end and the hot end; the cold end is connected to the temperature equalizing plate 143 through the electrically insulating heat conductive layer 142, and the temperature equalizing plate 143 is connected to the battery module 20; the hot end is connected to the first heat dissipation component 11 through the electrically insulating heat conductive layer 142.

[0039] Specifically, Figure 2 yes Figure 1 A partial enlarged schematic diagram of the structure in Figure 3 is in accordance with Figure 2 The structural diagram of the indicated area after enlargement, such as Figure 2 As shown, combined Figure 3 The thermoelectric cooling component 14 includes: a semiconductor thermoelectric cooling plate 141, an electrically insulating heat-conducting layer 142 and a temperature averaging plate 143; the two ends of the semiconductor thermoelectric cooling plate 14 are respectively a cold end and a hot end, and the electrically insulating heat-conducting layer 142 is respectively pasted on the surface of the cold end and the hot end; the cold end is connected to the temperature averaging plate 143 through the electrically insulating heat-conducting layer 142, and the temperature averaging plate 143 is connected to the battery module 20; the hot end is connected to the first heat dissipation component 11 through the electrically insulating heat-conducting layer 142.

[0040] The semiconductor thermoelectric cooling plate 141 is composed of two different semiconductor materials, divided into a cold end and a hot end. Its function is that after the current is loaded, the cold end provides cooling capacity, absorbs the heat of the battery cell, and then dissipates the power consumption and the absorbed heat from the hot end through the internal structure, and the current size can be controlled by a special current control chip to adjust the cooling capacity and the temperature difference between the hot and cold ends. Then the electrically insulating heat-conducting layer 142 is pasted on its two side surfaces through structural adhesive. The cold end is connected to the temperature equalizing plate 143 through the electrically insulating heat-conducting layer 142, and the temperature equalizing plate 143 is connected to the battery module 20. The temperature equalizing plate 143 transfers the heat of the battery cell to the cold end of the thermoelectric cooling plate, and plays the role of temperature equalization, electrical insulation and reducing contact thermal resistance. It is a non-metallic adhesive material of a certain thickness, sandwiched between the bottom surface of the battery cell and the cold end surface of the thermoelectric cooling plate, and bonded thereto. The hot end is connected to the first heat dissipation component 11 through the electrically insulating heat conductive layer 142. After the first heat dissipation component 11 is embedded in the heat pipe, it is pressed onto the electrically insulating heat conductive layer (142) by glue, so that the first heat dissipation component 11 can absorb and dissipate heat.

[0041] In an optional implementation, the second heat dissipation component 12 is connected to the box back plate 30 via a structural thermal conductive adhesive.

[0042] Specifically, the second heat dissipation component 12 is connected to the box back plate 30 through a structural thermal conductive adhesive.

[0043] The thermoelectric cooling device transports the heat to one end of the second heat dissipation component 12 embedded in the back panel side of the Pack box, and finally dissipates the heat into the external environment atmosphere, achieving the purpose of heat dissipation and temperature equalization of the battery cell and improving the efficiency of heat dissipation.

[0044] In an optional implementation, the thermoelectric cooling component 14 further includes: a power supply harness 144 , and the power supply harness 144 is electrically connected to the semiconductor thermoelectric cooling plate 141 .

[0045] like Figure 1 As shown, the thermoelectric cooling component 14 includes a power supply harness 144. The power supply and control harness of the thermoelectric cooling component 14 is directly embedded in the electrode points of the semiconductor thermoelectric cooling plate 141 and connected to the electrical components outside the system to form a power supply and control loop.

[0046] In an optional embodiment, the first heat dissipation component 11 includes a first card slot, and the second heat dissipation component 12 includes a second card slot. One end of the heat pipe 13 is connected to the first heat dissipation component 11 through the first card slot, and the other end of the heat pipe 13 is connected to the second heat dissipation component 12 through the second card slot. The heat pipe 13 is used to transfer the heat of the first heat dissipation component 11 to the second heat dissipation component 12.

[0047] In an optional embodiment, the first heat dissipation component 11 and the second heat dissipation component 12 are made of aluminum alloy material.

[0048] Specifically, Figure 1 As shown, the first heat dissipation component 11 and the second heat dissipation component 12 realize heat absorption and dissipation. The two are respectively connected to the two ends of the heat pipe. They are made of aluminum alloy and have slots on the surface for embedding the heat pipe. The heat sink on the side of the thermoelectric cooling plate is pressed onto the electrically insulating thermal conductive layer with glue after the heat pipe is embedded. The heat pipe transfers heat through the evaporation and condensation of the internal liquid. Both ends are embedded in the heat sink. One end of the heat sink embedded in the thermoelectric cooling plate absorbs heat. Through the phase change process of the liquid inside the heat pipe, the heat is transported to one end of the heat sink embedded in the back panel side of the Pack box, and finally the heat is dissipated to the external environment atmosphere, so as to achieve the purpose of heat dissipation and temperature equalization of the battery core.

[0049] The following is a further detailed description of a household energy storage device provided by another embodiment of the present application in conjunction with the accompanying drawings. Figure 4 A household energy storage device includes the thermoelectric refrigeration device 10 in the above embodiment, and also includes: a battery module 20 and a box back plate 30.

[0050] Specifically, Figure 4 As shown, a household energy storage device includes the thermoelectric refrigeration device 10 in the above embodiment, and also includes a battery module 20 and a box back plate 30. The thermoelectric refrigeration device 10 includes a first heat dissipation component 11, a second heat dissipation component 12, a heat pipe 13 and a thermoelectric refrigeration component 14; the thermoelectric refrigeration component 14 includes a cold end and a hot end, the cold end of the thermoelectric refrigeration component 14 is connected to the battery module 20 of the household energy storage device, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component 11; the first heat dissipation component 11 is connected to the second heat dissipation component 12 through the heat pipe 13; the second heat dissipation component 12 is connected to the box back plate 30 of the household energy storage device. The entire device is composed of the Pack box back plate 30, the thermoelectric refrigeration device 10 and the battery module 20, wherein the entire system is bonded into one by the Pack box side back plate and the thermoelectric refrigeration system through a structural thermal conductive adhesive, and the thermoelectric refrigeration system and the battery module are mechanically connected and fixed through the module bottom plate and corresponding bolts. Thereby, the above three form a whole, achieving the purpose of heat dissipation and temperature equalization of the battery cells, and improving the heat dissipation efficiency of household energy storage batteries.

[0051] In an optional embodiment, heat dissipation fins are provided on the back plate 30 of the box.

[0052] Specifically, Figure 8 As shown, Figure 8 The back panel of the box is equipped with heat dissipation fins. The side back panel of the Pack box (with heat dissipation fins) and the thermoelectric cooling device are bonded together by structural thermal conductive adhesive.

[0053] In an optional embodiment, the battery module 20 includes: a plurality of battery cells 21, at least one thermally conductive graphite sheet 22 and a module fixing module 23; the thermally conductive graphite sheet 22 is embedded between the plurality of battery cells 21, and the module fixing module 23 is used to fix the plurality of battery cells 21 clamped with the thermally conductive graphite sheet 22 into a battery cell group.

[0054] Specifically, Figure 5 As shown, first, when designing the battery module, the ordinary spacing materials between the battery cells are replaced by thermally conductive graphite sheets, and the characteristics of large thermal conductivity in parallel planes are used to improve the heat diffusion capacity of the battery cells from top to bottom, thereby achieving the goal of efficient temperature uniformity; then the module end plates and cable ties are used to fix the groups of battery cells with the thermally conductive graphite sheets clamped together. Figure 6 yes Figure 5 A partial enlarged schematic diagram of the structure in Figure 7 is in accordance with Figure 5 The structural diagram of the indicated area after enlargement, such as Figure 5 As shown, combined with Figure 6 and Figure 7 The improved battery module 20 includes a plurality of battery cells 21, at least one thermally conductive graphite sheet 22 and a module fixing module 23; the thermally conductive graphite sheet 22 is embedded between the plurality of battery cells 21, and the module fixing module 23 is used to fix the plurality of battery cells 21 sandwiched with the thermally conductive graphite sheet 22 into a battery cell group.

[0055] The embodiments of the present application replace the common spacing materials between the battery cells with thermally conductive graphite sheets, thereby improving the heat diffusion capacity of the battery cells from top to bottom and achieving the goal of efficient temperature uniformity.

[0056] In an optional embodiment, the module fixing module 23 includes: a module end plate 231, a module bottom plate 232, insulation cotton 233 and a module tie 234; the module bottom plate 232 is located at the bottom of the battery cell 21, the insulation cotton 233 is located between the battery cell 21 and the module bottom plate 232, the module tie 234 is used to fix multiple battery cells 21 into a battery cell group, and the module end plate 231 is located on both sides of the battery cell group.

[0057] Specifically, Figure 5 As shown, the module fixing module 23 fixes the multiple battery cells 21 clamped with the thermal conductive graphite sheet 22 into a battery cell group. The module fixing module 23 includes a module end plate 231, a module bottom plate 232, thermal insulation cotton 233 and a module tie 234; the module bottom plate 232 is located at the bottom of the battery cell 21, the thermal insulation cotton 233 is located between the battery cell 21 and the module bottom plate 232, the module tie 234 is used to fix the multiple battery cells 21 into a battery cell group, and the module end plate 231 is located on both sides of the battery cell group.

[0058] The embodiments of the present application provide a household energy storage device, which adds a thermoelectric cooling device and a thermally conductive graphite sheet between the battery cells of the battery module, so that the household energy storage battery can be used in a better heat dissipation environment, so that the battery can still be in a good operating temperature range under continuous charging and discharging conditions or in a high temperature environment, and the temperature uniformity is excellent, thereby achieving the purpose of extending the battery life and improving the battery safety.

[0059] On the basis of the above embodiments, the present application uses a thermoelectric refrigeration device to enable household energy storage batteries to be used in a better heat dissipation environment, so that the battery can still be in a good operating temperature range under continuous charging and discharging conditions or in a high temperature environment, and the temperature uniformity is excellent, so as to extend the battery life and improve the battery safety. A semiconductor thermoelectric refrigeration plate with high efficiency refrigeration, compact size and simple structure is used, and a thermoelectric refrigeration device is formed by combining heat pipes, thermal insulation materials and heat dissipation metal bottom plates. It is tightly combined with the bottom surface of the battery through a structural thermal conductive pad and fixed through a module bottom plate. The semiconductor thermoelectric refrigeration plate is connected to direct current and controlled by a special current control chip to achieve precise refrigeration control. The cold end is close to the bottom of the battery, and the heat conduction effect is enhanced by a structural thermal conductive pad. Then the heat is introduced into the heat pipe, and the other end of the heat pipe is embedded in the heat pipe bottom plate again, and then the heat is combined with the back plate of the box (with heat dissipation ribs) through the structural thermal conductive adhesive. The heat is transferred from the heat pipe to the back plate of the box, and finally the heat is dissipated to the external environment atmosphere. In addition, by adding a thermal conductive graphite sheet between the battery cells. Household energy storage batteries are used in a better heat dissipation environment, so that the batteries can still be in a good operating temperature range under continuous charging and discharging conditions or in high temperature environments, and have excellent temperature uniformity, thereby extending the battery life and improving battery safety.

[0060] It should be understood that the above specific embodiments of the present application are only used to illustrate or explain the principles of the present application, and do not constitute a limitation to the present application. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application should be included in the protection scope of the present application. In addition, the claims attached to the present application are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A thermoelectric refrigeration device, characterized in that: The device comprises: a first heat dissipation component, a second heat dissipation component, a heat pipe and a thermoelectric refrigeration component; The thermoelectric refrigeration component comprises a cold end and a hot end, the cold end of the thermoelectric refrigeration component is connected to the battery module of the household energy storage device, and the hot end of the thermoelectric refrigeration component is connected to the first heat dissipation component; The first heat dissipation component is connected to the second heat dissipation component through a heat pipe; The second heat dissipation component is connected to the back plate of the box of the household energy storage device.

2. The thermoelectric refrigeration device according to claim 1, characterized in that: The thermoelectric refrigeration component comprises: a semiconductor thermoelectric refrigeration plate, an electrical insulation heat conductive layer and a temperature homogenizing plate; The two ends of the semiconductor thermoelectric refrigeration plate are the cold end and the hot end respectively, and the electrical insulation and heat-conducting layers are respectively adhered to the surfaces of the cold end and the hot end; The cold end is connected to the temperature averaging plate through the electrically insulating heat-conducting layer, and the temperature averaging plate is connected to the battery module; The hot end is connected to the first heat dissipation component through the electrically insulating heat-conductive layer.

3. The thermoelectric refrigeration device according to claim 1, characterized in that: The second heat dissipation component is connected to the box back plate through a structural thermal conductive adhesive.

4. The thermoelectric refrigeration device according to claim 2, characterized in that: The thermoelectric cooling component further includes: a power supply harness, wherein the power supply harness is electrically connected to the semiconductor thermoelectric cooling plate.

5. The thermoelectric refrigeration device according to claim 1, characterized in that: The first heat dissipation component includes a first card slot, and the second heat dissipation component includes a second card slot. One end of the heat pipe is connected to the first heat dissipation component through the first card slot, and the other end of the heat pipe is connected to the second heat dissipation component through the second card slot. The heat pipe is used to transfer heat from the first heat dissipation component to the second heat dissipation component.

6. The thermoelectric refrigeration device according to claim 1, characterized in that: The first heat dissipation component and the second heat dissipation component are made of aluminum alloy material.

7. A household energy storage device, characterized in that: The thermoelectric refrigeration device comprising any one of claims 1 to 6 further comprises: a battery module and a box back plate.

8. The household energy storage device according to claim 7, characterized in that: The back plate of the box body is provided with heat dissipation fins.

9. The household energy storage device according to claim 7, characterized in that: The battery module comprises: a plurality of battery cells, at least one thermally conductive graphite sheet and a module fixing module; The thermally conductive graphite sheet is embedded between the plurality of battery cells, and the module fixing module is used to fix the plurality of battery cells clamped with the thermally conductive graphite sheet into a battery cell group.

10. The household energy storage device according to claim 9, characterized in that: The module fixing module comprises: a module end plate, a module bottom plate, heat insulation cotton and a module tie; The module bottom plate is located at the bottom of the battery cell, the heat insulation cotton is located between the battery cell and the module bottom plate, the module tie is used to fix the multiple battery cells into a battery cell group, and the module end plates are located on both sides of the battery cell group.

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