Battery pack and electric device

Abstract

The utility model relates to new energy battery technical field discloses a kind of battery pack and electrical equipment, battery pack includes: box, with containing cavity;Multiple electric core, including shell, shell includes first wall;Heat dissipation system, including liquid inlet pipeline, liquid outlet pipeline and multiple heat dissipation components, between two adjacent heat dissipation components Electric core is equipped;Heat dissipation component includes cold plate and elastic heat-conducting pad, first wall and elastic heat-conducting pad are attached, cold plate has cooling flow passage, liquid inlet pipeline and liquid outlet pipeline are located in the same side of cold plate along third direction, the liquid inlet end of each cooling flow passage is communicated with liquid inlet pipeline, the liquid outlet end of each cooling flow passage is communicated with liquid outlet pipeline.First wall is the largest wall surface of shell area, improve the cooling efficiency of heat dissipation system;Elastic heat-conducting pad is extruded deformation when electric core expands, cold plate, liquid inlet pipeline, liquid outlet pipeline are connected as a whole, can relatively reduce the use of beam of battery pack, it is favorable to promote the energy density and space utilization of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] With the rapid development of electric vehicles, the performance requirements for battery packs are constantly increasing, including higher demands on fast charging capabilities and energy density. During high-rate charging and discharging, the battery cells generate a large amount of heat due to internal chemical reactions.

[0003] Traditional battery packs typically use bottom liquid cooling to solve heat dissipation problems. Bottom liquid cooling involves placing a liquid cooling plate at the bottom of the battery pack, with the battery cells in direct or indirect contact with the liquid cooling plate to transfer heat.

[0004] The aforementioned bottom-cooled liquid cooling method results in a small contact area between the cooling system and the battery cells, leading to low cooling efficiency and impacting cell lifespan and safety. Furthermore, as the number of battery cycles increases, the cells expand. To improve the overall strength of the battery pack, a crossbeam is typically installed in the middle. However, this crossbeam occupies space within the battery pack where the cells are arranged, reducing the pack's energy density and space utilization. Utility Model Content

[0005] The purpose of this utility model is to provide a battery pack to solve the problems of low heat dissipation efficiency and low space utilization in the prior art; this utility model also provides an electrical device using the battery pack.

[0006] To achieve the above objectives, this utility model provides a battery pack having a first direction, a second direction, and a third direction that are mutually perpendicular to each other. The battery pack includes: The box-shaped enclosure has a receiving cavity; Multiple battery cells are spaced apart in the receiving cavity along the first direction. Each battery cell includes a housing. The housing includes a first wall disposed opposite to each other along the first direction. The first wall is the wall with the largest area. The heat dissipation system includes an inlet pipe, an outlet pipe, and multiple heat dissipation components. The multiple heat dissipation components are spaced apart in the receiving cavity along the first direction, and the battery cell is provided between two adjacent heat dissipation components. The heat dissipation assembly includes a cold plate and elastic thermal pads. The elastic thermal pads are provided on both sides of the cold plate along the first direction. The first wall is in contact with the elastic thermal pads. The cold plate has cooling channels. The liquid inlet pipe and the liquid outlet pipe are spaced apart along the second direction. The liquid inlet pipe and the liquid outlet pipe are located on the same side of the cold plate along the third direction. The liquid inlet end of each cooling channel is connected to the liquid inlet pipe, and the liquid outlet end of each cooling channel is connected to the liquid outlet pipe.

[0007] In some embodiments, the housing further includes a second wall disposed on one side of the first wall along the third direction, and the battery cell further includes an explosion-proof valve fixedly connected to the second wall. The liquid inlet pipe, the liquid outlet pipe, and the explosion-proof valve are disposed on the same side of the second wall along the third direction.

[0008] In some embodiments, the battery pack further includes a support plate, the support plate including a first plate and a second plate connected to each other, the second plate being connected to the side of the first plate near the battery cell, and the second plate being connected to the second wall; The second plate has an exhaust hole that penetrates the second plate along the third direction, and the exhaust hole and the explosion-proof valve are arranged opposite to each other along the third direction; The housing includes a bottom protective plate and a side plate connected to the bottom protective plate. The bottom protective plate and the side plate enclose the cavity. The first plate, the second plate, and the bottom protective plate enclose the exhaust channel that communicates with the exhaust hole.

[0009] In some embodiments, there are two first plates. Along the second direction, the two first plates are respectively connected to both sides of the second plate. The two first plates and the second wall respectively enclose a first cavity. The two first cavities are located on both sides of the exhaust channel along the second direction. The liquid inlet pipe and the liquid outlet pipe are respectively disposed in the two first cavities.

[0010] In some embodiments, the battery pack further includes a support pad disposed between the first plate and the bottom protective plate.

[0011] In some embodiments, the cooling channels extend around the first direction, and multiple cooling channels are coaxially arranged, each of which is connected to the liquid inlet pipe and the liquid outlet pipe.

[0012] In some embodiments, the heat dissipation assembly further includes a plurality of flow dividers, with the flow dividers connected to both ends of the cold plate along the second direction. Each flow divider has a flow divider cavity, the cooling channel communicates with the flow divider cavity, and the liquid inlet pipe and the liquid outlet pipe are respectively fixedly connected to the flow divider.

[0013] In some embodiments, the heat dissipation assembly further includes a plurality of quick connectors, each of the diverter plates is fixedly connected to the quick connector, and the liquid inlet pipe and the liquid outlet pipe are respectively fixedly connected to the quick connector.

[0014] In some embodiments, the heat dissipation system further includes an inlet manifold and an outlet manifold, wherein the inlet pipe is connected to the inlet manifold and the outlet pipe is connected to the outlet manifold. The battery pack also includes an expansion beam disposed in the receiving cavity. The expansion beam has an assembly cavity extending along the second direction. The liquid inlet manifold and the liquid outlet manifold are both disposed in the assembly cavity.

[0015] This utility model also provides an electrical device, including the battery pack described in any of the above technical solutions.

[0016] Compared with the prior art, the battery pack and electrical equipment of this utility model embodiment have the following advantages: the battery cell is located between two adjacent heat dissipation components of the heat dissipation system. The cold plate of the heat dissipation component is provided with elastic thermal conductive pads on both sides along the first direction. When the temperature of the battery cell is controlled, the coolant can enter the cooling channel of the cold plate through the inlet pipe. The coolant exchanges heat with the first wall of the battery cell shell and then flows out through the outlet pipe. The first wall is the wall surface with the largest area of ​​the shell, which increases the heat exchange area between the coolant and the battery cell, realizes uniform cooling of the battery cell over a large area, and improves the cooling efficiency of the heat dissipation system. At the same time, when the battery cell expands, the elastic thermal conductive pad is squeezed and deformed, which can effectively absorb the force of the battery cell expansion. Furthermore, the cold plate, the inlet pipe, and the outlet pipe are connected as a whole to help fix each battery cell, increase the structural strength of the entire battery pack, and can relatively reduce the use of the crossbeam in the middle of the battery pack, thereby reducing the space occupied by the crossbeam in the battery pack and improving the energy density and space utilization of the battery pack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery pack structure of this utility model; Figure 2 yes Figure 1 A schematic diagram of the battery pack without the top cover; Figure 3 yes Figure 2 A schematic diagram of the battery pack structure omitting the casing and bottom protective plate; Figure 4 yes Figure 3 A schematic diagram of the heat dissipation system and cell assembly structure of the battery pack; Figure 5 yes Figure 4 A schematic diagram of the heat dissipation system of the battery pack; Figure 6yes Figure 4 A schematic diagram showing the disassembled structure of the heat dissipation components and battery cells of the battery pack. Figure 7 yes Figure 6 A schematic diagram of the heat dissipation component; Figure 8 yes Figure 2 A partial cross-sectional view of the battery pack; Figure 9 yes Figure 8 A schematic diagram of the structure of the support plate for the battery pack.

[0018] In the diagram, 1. Box body, 11. Receiving cavity, 12. Bottom protective plate, 13. Side plate, 2. Battery cell, 21. Shell, 211. First wall, 212. Second wall, 22. Explosion-proof valve, 3. Heat dissipation system, 31. Liquid inlet pipe, 32. Liquid outlet pipe, 33. Heat dissipation component, 331. Cold plate, 3311. Cooling channel, 332. Elastic thermal conductive pad, 333. Diverter plate, 334. Quick connector, 4. Support plate, 41. First plate, 42. Second plate, 421. Exhaust hole, 6. Exhaust channel, 7. First cavity, 8. Support pad, 9. Liquid inlet manifold, 10. Liquid outlet manifold, 20. Expansion beam, 201. Assembly cavity, 30. Top cover, X. First direction, Y. Second direction, Z. Third direction. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] A preferred embodiment of the battery pack of this utility model is as follows: Figures 1 to 9 As shown, the battery pack includes a housing 1, battery cells 2, and a heat dissipation system 3. The housing 1 has a receiving cavity 11, and the battery cells 2 and the heat dissipation system 3 are both disposed within the receiving cavity 11 of the housing 1. The housing 1 protects the battery cells 2 and the heat dissipation system 3, and the heat dissipation system 3 is used to cool the battery cells 2. The battery pack also has a first direction X, a second direction Y, and a third direction Z that are mutually perpendicular. In this embodiment, the first direction X is the length direction of the battery pack, the second direction Y is the width direction of the battery pack, and the third direction Z is the height direction of the battery pack.

[0021] like Figures 1 to 4 As shown, there are multiple battery cells 2, and each battery cell 2 is spaced apart along the first direction X within the receiving cavity 11 of the housing 1. Each battery cell 2 includes a housing 21, which is rectangular in shape and includes first walls 211 disposed opposite each other along the first direction X. In this embodiment, the first wall 211 is the wall with the largest area of ​​the battery cell 2, and the first direction X is perpendicular to the first direction X.

[0022] like Figure 4 and Figure 5 As shown, the heat dissipation system 3 includes an inlet pipe 31, an outlet pipe 32, and heat dissipation components 33. Multiple heat dissipation components 33 are spaced apart along a first direction X within the receiving cavity 11. The inlet pipe 31 and outlet pipe 32 are connected to each heat dissipation component 33 to deliver cooling medium into each component. Each adjacent heat dissipation component 33 contains a battery cell 2; that is, heat dissipation components 33 are arranged on both sides of each battery cell 2. The heat dissipation components 33 are positioned between the sides of the battery cells 2, allowing both sides of the battery cells 2 to exchange heat with the cooling medium, thus improving the heat dissipation efficiency of the battery cells 2.

[0023] like Figure 6 and Figure 7 As shown, the heat dissipation assembly 33 includes a cold plate 331 and elastic thermal pads 332. Elastic thermal pads 332 are provided on both sides of the cold plate 331 along the first direction X. The cold plate 331 and the two elastic thermal pads 332 form a stacked structure. In this embodiment, the cold plate 331 is made of a metal material, such as aluminum alloy or copper alloy. The interior of the cold plate 331 has cooling channels 3311 for the flow of cooling medium. The stacked structure of the cold plate 331 and the elastic thermal pads 332 can not only effectively absorb the expansion force of the battery cell 2, but also achieve rapid cooling of the battery cell 2, significantly reducing the risk of thermal runaway and enhancing battery safety. In this embodiment, the surfaces of the cold plate 331, the inlet pipe 31, and the outlet pipe 32 can be treated with anti-corrosion measures to improve durability.

[0024] The elastic thermal conductive pad 332 is used to adhere to the first wall 211 of the battery cell 2, effectively absorbing the expansion force of the battery cell 2 and conducting the heat of the battery cell 2 to the cold plate 331. The first wall 211 is the side with the largest area of ​​the battery cell 2, which can achieve uniform cooling of the large surface area of ​​the battery cell 2. In this embodiment, the elastic thermal conductive pad 332 is provided with double-sided adhesive, and the two sides of the elastic thermal conductive pad 332 are respectively bonded and fixed to the cold plate 331 and the first wall 211; the elastic thermal conductive pad 332 is made of rubber material with high thermal conductivity and high elasticity, with a thermal conductivity of not less than 1 W / m·K and an elastic modulus between 0.5-5 MPa, to ensure good thermal conductivity and high expansion absorption capacity.

[0025] like Figure 5As shown, the liquid inlet pipe 31 and the liquid outlet pipe 32 are spaced apart along the second direction Y. The liquid inlet pipe 31 and the liquid outlet pipe 32 are located on the same side of the cold plate 331 along the third direction Z, that is, the liquid inlet pipe 31 and the liquid outlet pipe 32 are both located on the upper side of the cold plate 331, which can improve the space utilization of the battery pack. The liquid inlet end of each cooling channel 3311 is connected to the liquid inlet pipe 31, and the liquid outlet end of each cooling channel 3311 is connected to the liquid outlet pipe 32. The liquid inlet pipe 31 and the liquid outlet pipe 32 are connected through the cooling channel 3311 to form a flow path for the cooling medium. The cooling medium enters the cooling channel 3311 of the cold plate 331 through the liquid inlet pipe 31, exchanges heat with the large surface of the battery cell 2, and then flows out through the liquid outlet pipe 32.

[0026] The battery cell 2 of the battery pack is located between two adjacent heat dissipation components 33 of the heat dissipation system 3. Elastic thermally conductive pads 332 are provided on both sides of the cold plate 331 of the heat dissipation component 33 along the first direction X. When regulating the temperature of the battery cell 2, coolant can enter the cooling channel 3311 of the cold plate 331 through the inlet pipe 31. After heat exchange with the first wall 211 of the casing 21 of the battery cell 2, the coolant flows out through the outlet pipe 32. The first wall 211 is the wall surface with the largest area of ​​the casing 21, increasing the heat exchange area between the coolant and the battery cell 2. The large-area uniform cooling of the battery cell 2 improves the cooling efficiency of the heat dissipation system 3. At the same time, when the battery cell 2 expands, the elastic thermal pad 332 is squeezed and deformed, which can effectively absorb the expansion force of the battery cell 2. Furthermore, the cold plate 331, the liquid inlet pipe 31, and the liquid outlet pipe 32 are connected as a whole to help fix each battery cell 2, increase the structural strength of the entire battery pack, and relatively reduce the use of the crossbeam in the middle of the battery pack, thereby reducing the space occupied by the crossbeam in the battery pack and improving the energy density and space utilization of the battery pack.

[0027] In some embodiments, the housing 21 further includes a second wall 212, which is disposed on one side of the first wall 211 along the third direction Z. The battery cell 2 further includes an explosion-proof valve 22, which is fixedly connected to the second wall 212. The liquid inlet pipe 31, the liquid outlet pipe 32 and the explosion-proof valve 22 are disposed on the same side of the second wall 212 along the third direction Z.

[0028] like Figure 6 and Figure 8As shown, the second wall 212 of the housing 21 is perpendicular to the first wall 211. The second wall 212 is either the top or bottom side of the housing 21, used to install and fix the explosion-proof valve 22. When the battery cell 2 experiences thermal runaway, high-temperature and high-pressure gas can be discharged from the explosion-proof valve 22 in a timely manner. The battery pack typically requires an exhaust channel 6 connected to the explosion-proof valve 22. The liquid inlet pipe 31, liquid outlet pipe 32, and explosion-proof valve 22 are located on the same side of the second wall 212, which allows for a more efficient allocation of space within the battery pack housing 1 and improves space utilization efficiency. In this embodiment, the second wall 212 is the bottom side of the housing 21. The liquid inlet pipe 31, liquid outlet pipe 32, and explosion-proof valve 22 are all located at the bottom of the housing 21 along the third direction Z. This not only improves space utilization efficiency but also ensures that the exhaust direction of the high-temperature and high-pressure gas is away from the passenger compartment, achieving thermoelectric separation and enhancing the safety of the occupants.

[0029] In some embodiments, the battery pack further includes a support plate 4, which includes a first plate 41 and a second plate 42 connected to each other. The second plate 42 is connected to the side of the first plate 41 near the cell 2 and is connected to the second wall 212. The second plate 42 has an exhaust hole 421 that extends through the second plate 42 along a third direction Z. The exhaust hole 421 and the explosion-proof valve 22 are disposed opposite to each other along the third direction Z. The housing 1 includes a bottom guard plate 12 and a side plate 13 connected to the bottom guard plate 12. The bottom guard plate 12 and the side plate 13 enclose a receiving cavity 11. The first plate 41, the second plate 42 and the bottom guard plate 12 enclose an exhaust channel 6 that communicates with the exhaust hole 421.

[0030] like Figure 8 and Figure 9 As shown, a support plate 4 is provided between the second wall 212 of the battery cell 2 and the bottom protective plate 12 of the housing 1 in the battery pack. The support plate 4 can support the battery cell 2 in the third direction Z, increasing the stability of the battery cell 2 and ensuring the overall strength of the battery cell 2 assembly. The support plate 4 is formed by a first plate 41 and a second plate 42. The second plate 42 is connected to the second wall 212 of the battery cell 2, and the first plate 41 is supported on the bottom protective plate 12 of the housing 1 to support each battery cell 2 in the third direction Z. The second plate 42 is provided with an exhaust hole 421 opposite to the explosion-proof valve 22. At the same time, the exhaust channel 6 formed by the bottom protective plate 12, the first plate 41, and the second plate 42 is connected to the exhaust hole 421. The high-temperature and high-pressure gas discharged from the explosion-proof valve 22 can be smoothly discharged after passing through the exhaust hole 421 and entering the exhaust channel 6.

[0031] In some embodiments, there are two first plates 41 along the second direction Y. The two first plates 41 are respectively connected to the two sides of the second plate 42. The two first plates 41 are respectively enclosed with the second wall 212 to form a first cavity 7. The two first cavities 7 are located on both sides of the exhaust channel 6 along the second direction Y. The liquid inlet pipe 31 and the liquid outlet pipe 32 are respectively provided in the two first cavities 7.

[0032] Two first plates 41 are connected to the two sides of the second plate 42 along the second direction Y. The two first plates 41 are respectively arranged opposite to the liquid inlet pipe 31 and the liquid outlet pipe 32 along the third direction Z. The two first cavities 7 formed by the two first plates 41 and the second wall 212 can respectively accommodate the liquid inlet pipe 31 and the liquid outlet pipe 32, so that the liquid inlet pipe 31 and the liquid outlet pipe 32 are set separately, improving the space utilization rate and avoiding damage to the liquid inlet pipe 31 and the liquid outlet pipe 32 by the high temperature and high pressure gas in the exhaust channel 6.

[0033] In some embodiments, the battery pack further includes a support pad 8 disposed between the first plate 41 and the bottom protective plate 12.

[0034] like Figure 8 As shown, a support pad 8 is provided between the first plate 41 and the bottom protective plate 12. The support pad 8 is an elastic pad, which can prevent squeezing damage after the first plate 41 and the bottom protective plate 12 come into direct contact, and can also absorb and buffer the force between the support plate 4 and the bottom protective plate 12. In this embodiment, the support pad 8 is specifically foam.

[0035] In some embodiments, the cooling channel 3311 extends around the first direction X, and multiple cooling channels 3311 are coaxially arranged, each of which is connected to the liquid inlet pipe 31 and the liquid outlet pipe 32.

[0036] like Figure 8 As shown, multiple cooling channels 3311 extend along the first direction X and are coaxially arranged. The cooling medium in the liquid inlet pipe 31 can enter each cooling channel 3311 respectively. The cooling medium in each cooling channel 3311 flows out after converging into the liquid outlet pipe 32, ensuring that the temperature is uniform throughout the cold plate 331 and improving the heat exchange efficiency between the cold plate 331 and the first wall 211 of the battery cell 2.

[0037] In some embodiments, the heat dissipation assembly 33 further includes a plurality of flow dividers 333. Both ends of the cold plate 331 along the second direction Y are connected to flow dividers 333. Each flow divider 333 has a flow divider cavity. The cooling channel 3311 is connected to the flow divider cavity. The liquid inlet pipe 31 and the liquid outlet pipe 32 are respectively fixedly connected to the flow divider 333.

[0038] like Figures 5 to 7As shown, both ends of the cold plate 331 are connected to the flow divider plate 333. The cold plate 331 and the flow divider plate 333 can be welded and fixed together. The flow divider cavity inside the flow divider plate 333 is connected to the cooling channel 3311. After the liquid inlet pipe 31 and the liquid outlet pipe 32 are fixedly connected to the flow divider plate 333, they are connected to the cooling channel 3311 through the flow divider cavity. The flow divider cavity of the flow divider plate 333 can temporarily store the cooling medium, which can ensure the stable flow pressure of the cooling medium, so that the cooling medium in each cooling channel 3311 is evenly distributed and the cooling efficiency is improved.

[0039] In some embodiments, the heat dissipation assembly 33 further includes a plurality of quick connectors 334, each of the diverter plates 333 is fixedly connected to a quick connector 334, and the liquid inlet pipe 31 and the liquid outlet pipe 32 are respectively fixedly connected to the quick connectors 334.

[0040] Each diverter plate 333 is connected to the inlet pipe 31 and the outlet pipe 32 via a quick connector 334, ensuring the sealing and structural strength of the connection and facilitating disconnection for later maintenance. In this embodiment, the quick connector 334 is made of stainless steel or aluminum alloy. In other embodiments, the diverter plate 333 can also be directly welded to the inlet pipe 31 and the outlet pipe 32.

[0041] In some embodiments, the heat dissipation system 3 further includes an inlet manifold 9 and an outlet manifold 10, with the inlet pipe 31 connected to the inlet manifold 9 and the outlet pipe 32 connected to the outlet manifold 10; the battery pack further includes an expansion beam 20, which is disposed in the receiving cavity 11 and has an assembly cavity 201 extending along the second direction Y, with both the inlet manifold 9 and the outlet manifold 10 disposed in the assembly cavity 201.

[0042] The inlet manifold 9 is connected to the inlet pipe 31, and the outlet manifold 10 is connected to the outlet pipe 32. The cooling medium circulates externally through the inlet manifold 9 and the outlet manifold 10. The inlet pipe 31 and the outlet pipe 32 connect each row of cells 2 in series, which enhances the structural strength of the entire battery pack. The design of the inlet manifold 9 and the outlet manifold 10 reduces the weight of the battery pack and improves the space utilization and energy density of the entire battery pack.

[0043] like Figure 3 and Figure 4As shown, the inlet manifold 9 and outlet manifold 10 are both installed in the assembly cavity 201 of the expansion beam 20, achieving integrated connection between the inlet manifold 9 and outlet manifold 10 and the housing 1. Furthermore, by preferentially integrating the inlet manifold 9 and outlet manifold 10 with the expansion beam 20, and then fixing the outlet pipe 32 and inlet pipe 31 to the diverter plate 333 via quick connectors 334, not only can the cooling medium be transferred, but the heat dissipation system 3 is also integrated and fixed with the housing 1, enhancing the overall structural strength of the battery pack. This also replaces the intermediate beam structure in traditional battery packs, simplifying the structural design and optimizing the battery pack's space.

[0044] This utility model also provides a preferred embodiment of a battery pack, including a battery cell. The specific structure of the battery cell is the same as that of the battery cell described in any of the above technical solutions, and will not be repeated here.

[0045] In summary, this utility model embodiment provides a battery pack and electrical device, in which the battery cell is located between two adjacent heat dissipation components of the heat dissipation system. Elastic thermally conductive pads are provided on both sides of the cold plate of the heat dissipation component along a first direction. When regulating the temperature of the battery cell, coolant can enter the cooling channel of the cold plate through the inlet pipe. The coolant exchanges heat with the first wall of the battery cell's shell before flowing out through the outlet pipe. The first wall is the wall with the largest shell area, increasing the heat exchange area between the coolant and the battery cell, achieving uniform cooling of the battery cell over a large area, and improving the cooling efficiency of the heat dissipation system. Simultaneously, when the battery cell expands, the elastic thermally conductive pads are compressed and deformed, effectively absorbing the expansion force of the battery cell. Furthermore, the cold plate, inlet pipe, and outlet pipe are connected as a whole, assisting in fixing each battery cell and increasing the structural strength of the entire battery pack. This relatively reduces the use of the central crossbeam of the battery pack, thereby reducing the space occupied by the crossbeam and improving the energy density and space utilization of the battery pack.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, The battery pack has a first direction, a second direction, and a third direction that are mutually perpendicular to each other. The battery pack includes: The box-shaped enclosure has a receiving cavity; Multiple battery cells are spaced apart in the receiving cavity along the first direction. Each battery cell includes a housing. The housing includes a first wall disposed opposite to each other along the first direction. The first wall is the wall with the largest area. The heat dissipation system includes an inlet pipe, an outlet pipe, and multiple heat dissipation components. The multiple heat dissipation components are spaced apart in the receiving cavity along the first direction, and the battery cell is provided between two adjacent heat dissipation components. The heat dissipation assembly includes a cold plate and elastic thermal pads. The elastic thermal pads are provided on both sides of the cold plate along the first direction. The first wall is in contact with the elastic thermal pads. The cold plate has cooling channels. The liquid inlet pipe and the liquid outlet pipe are spaced apart along the second direction. The liquid inlet pipe and the liquid outlet pipe are located on the same side of the cold plate along the third direction. The liquid inlet end of each cooling channel is connected to the liquid inlet pipe, and the liquid outlet end of each cooling channel is connected to the liquid outlet pipe.

2. The battery pack according to claim 1, characterized in that, The housing also includes a second wall, which is disposed on one side of the first wall along the third direction. The battery cell also includes an explosion-proof valve, which is fixedly connected to the second wall. The liquid inlet pipe, the liquid outlet pipe, and the explosion-proof valve are disposed on the same side of the second wall along the third direction.

3. The battery pack according to claim 2, characterized in that, The battery pack also includes a support plate, which includes a first plate and a second plate connected to each other. The second plate is connected to the side of the first plate near the battery cell and is connected to the second wall. The second plate has an exhaust hole that penetrates the second plate along the third direction, and the exhaust hole and the explosion-proof valve are arranged opposite to each other along the third direction; The housing includes a bottom protective plate and a side plate connected to the bottom protective plate. The bottom protective plate and the side plate enclose the cavity. The first plate, the second plate, and the bottom protective plate enclose the exhaust channel that communicates with the exhaust hole.

4. The battery pack according to claim 3, characterized in that, There are two first plates. Along the second direction, the two first plates are respectively connected to both sides of the second plate. The two first plates and the second wall respectively enclose a first cavity. The two first cavities are located on both sides of the exhaust channel along the second direction. The liquid inlet pipe and the liquid outlet pipe are respectively located in the two first cavities.

5. The battery pack according to claim 4, characterized in that, The battery pack also includes a support pad, which is disposed between the first plate and the bottom protective plate.

6. The battery pack according to any one of claims 1-5, characterized in that, The cooling channels extend around the first direction, and multiple cooling channels are coaxially arranged. Each cooling channel is connected to the liquid inlet pipe and the liquid outlet pipe.

7. The battery pack according to claim 6, characterized in that, The heat dissipation assembly also includes multiple flow dividers. The flow dividers are connected to both ends of the cold plate along the second direction. Each flow divider has a flow divider cavity. The cooling channel is connected to the flow divider cavity. The liquid inlet pipe and the liquid outlet pipe are respectively fixedly connected to the flow divider.

8. The battery pack according to claim 7, characterized in that, The heat dissipation assembly also includes multiple quick connectors, each of the flow dividers is fixedly connected to the quick connector, and the liquid inlet pipe and the liquid outlet pipe are respectively fixedly connected to the quick connector.

9. The battery pack according to any one of claims 1-5, characterized in that, The heat dissipation system also includes an inlet manifold and an outlet manifold, wherein the inlet pipe is connected to the inlet manifold and the outlet pipe is connected to the outlet manifold. The battery pack also includes an expansion beam disposed in the receiving cavity. The expansion beam has an assembly cavity extending along the second direction. The liquid inlet manifold and the liquid outlet manifold are both disposed in the assembly cavity.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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