Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, which comprise a battery cell, a cooling member and a sealing assembly; the cooling member is arranged on one side of the battery cell and connected with the battery cell; the side of the battery cell facing the cooling member is provided with a first flow guide hole; the cooling member is provided with a cooling channel for flowing cooling medium; the cooling member is provided with a second flow guide hole in the corresponding position of the first flow guide hole, which is communicated with the cooling channel; the second flow guide hole is communicated with the first flow guide hole to form a flow guide channel; the sealing assembly comprises a hot-melt sealing member and a sealing member; the hot-melt sealing member is sealed in the flow guide channel; the hot-melt sealing member can be melted by heat when the battery cell is in thermal runaway, so that the flow guide channel is conducted; the sealing member is arranged between the battery cell and the cooling member and surrounds the flow guide channel, so as to seal the gap between the battery cell and the cooling member. The cooling medium of the application can enter the battery cell along the flow guide channel when the battery cell is in thermal runaway, so as to ensure the cooling effect of the battery cell and reduce the possibility of thermal diffusion.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] Lithium-ion batteries have advantages such as high energy density, high power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness.

[0003] In related technologies, batteries are mostly cooled by liquid cooling plates, which can effectively reduce the temperature of the battery during operation and prevent the further spread of thermal runaway to a certain extent when thermal runaway occurs.

[0004] However, as battery energy density increases, the cooling method of heat conduction through the cell casing and liquid cooling plate is slow and difficult to achieve efficient and rapid cooling, which may lead to heat diffusion. Utility Model Content

[0005] This application aims to provide a battery pack and electrical device that can solve the problem that as the energy density of batteries increases, the cooling method of heat conduction through the cell casing and liquid cooling plate has a slow heat dissipation speed, making it difficult to achieve efficient and rapid cooling, and may lead to heat diffusion.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a battery pack, including a battery cell, a cooling component, and a sealing assembly; the cooling component is disposed on one side of the battery cell and connected to the battery cell, and the side of the battery cell facing the cooling component is provided with a first flow guide hole; The cooling component is provided with a cooling channel for the flow of cooling medium, and the cooling component is provided with a second guide hole at a position corresponding to the first guide hole, which communicates with the cooling channel. The second guide hole communicates with the first guide hole to form a guide channel. The sealing assembly includes a heat-melting plug and a sealing element. The heat-melting plug is sealed within the flow channel. The heat-melting plug can be heated and melted when the battery cell experiences thermal runaway to open the flow channel. The sealing element is disposed between the battery cell and the cooling element and surrounds the flow channel to seal the gap between the battery cell and the cooling element.

[0007] Optionally, the battery cell has a first groove on the side facing the cooling element, the first groove surrounds the first flow guide hole, the sealing element is disposed in the first groove, and the sealing element abuts against the cooling element.

[0008] Optionally, the cooling component has a second groove on the side facing the battery cell, the second groove surrounds the second flow guide hole, the sealing component is disposed in the second groove, and the sealing component abuts against the battery cell.

[0009] Optionally, the battery cell has a first groove on the side facing the cooling element, the first groove surrounding the first flow guide hole; the cooling element has a second groove on the side facing the battery cell, the second groove surrounding the second flow guide hole; at least a portion of the sealing element is disposed in the first groove, and at least another portion of the sealing element is disposed in the second groove; both the battery cell and the cooling element abut against the sealing element.

[0010] Optionally, the first flow guide hole includes a first hole segment and a second hole segment that are interconnected. The battery cell is provided with a first receiving cavity. The first hole segment is connected to the first receiving cavity. The second hole segment is located on the side of the first hole segment away from the first receiving cavity. The second hole segment is connected to the second flow guide hole. A first step is formed between the sidewall of the first hole segment and the sidewall of the second hole segment. The hot-melt sealing component includes a first sealing section and a second sealing section connected to each other. The first sealing section is inserted into the first hole section, and the second sealing section is inserted into the second hole section. A second step is formed between the first sealing section and the second sealing section, and the second step is in a limiting fit with the first step.

[0011] Optionally, the sealing assembly further includes an adhesive layer bonded between the first stepped portion and the second stepped portion.

[0012] Optionally, the battery cell has a first direction and a second direction that are perpendicular to each other, and there are multiple battery cells, with the multiple battery cells arranged along the first direction; The cooling element is disposed on one side of the plurality of battery cells along the second direction. The cooling element is provided with a second flow guide hole at a position corresponding to each of the battery cells. Each second flow guide hole communicates with the first flow guide hole of a battery cell to form the flow guide channel.

[0013] Optionally, the device further includes a housing having a receiving cavity with an opening and a bottom opposite to each other, wherein a plurality of battery cells are arranged in the receiving cavity along a first direction, and a cooling element is disposed between the plurality of battery cells and the bottom of the cavity.

[0014] Optionally, it also includes a thermally conductive adhesive layer disposed between the cooling element and the battery cell.

[0015] Secondly, embodiments of this application provide an electrical device including the battery pack of any of the above embodiments.

[0016] In the embodiments of this application, the first flow guide hole of the battery cell is connected to the second flow guide hole of the cooling component to form a flow guide channel, through which cooling medium can be introduced. A heat-fused sealing component of the sealing assembly seals the flow guide channel. When the battery is operating normally, the battery temperature is low, and the heat-fused sealing component can effectively seal the flow guide channel. When thermal runaway occurs, the heat-fused sealing component melts at high temperature, opening the flow guide channel. At this time, the cooling channel communicates with the interior of the battery cell through the flow guide channel, allowing the cooling medium in the cooling channel to enter the battery cell for cooling. Furthermore, by providing a sealing component between the battery cell and the cooling component, the sealing component surrounds the flow guide channel to seal the gap between the battery cell and the cooling component, thereby ensuring that the cooling medium can enter the battery cell along the flow guide channel, reducing cooling medium leakage, ensuring the cooling effect on the battery cell, and reducing the possibility of heat diffusion.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein: Figure 1 This is a three-dimensional structural diagram of the battery pack according to an embodiment of this application; Figure 2 This is a cross-sectional view of the battery pack according to an embodiment of this application; Figure 3 This is a schematic diagram of the exploded structure of the battery pack according to an embodiment of this application; Figure 4 This is a three-dimensional structural diagram of the battery cell according to an embodiment of this application; Figure 5 This is a cross-sectional structural diagram of the battery cell according to an embodiment of this application; Figure 6 This is a three-dimensional structural diagram of the cooling component according to an embodiment of this application; Figure 7 This is a cross-sectional structural diagram of the cooling component according to an embodiment of this application.

[0019] Figure label: 10. Battery cell; 11. First receiving cavity; 12. First groove; 13. First guide hole; 131. First hole segment; 132. Second hole segment; 20. Cooling component; 21. Cooling channel; 22. Second guide hole; 23. Second groove; 30. Sealing assembly; 31. Hot melt sealing component; 311. First sealing segment; 312. Second sealing segment; 32. Sealing component; 33. Adhesive layer; 40. Thermally conductive adhesive layer; 41. Clearance hole; X, First direction; Y, Second direction. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The battery pack and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0025] like Figure 1 and Figure 2 As shown, a battery pack according to some embodiments of this application includes a battery cell 10, a cooling element 20, and a sealing assembly 30. The cooling element 20 is disposed on one side of the battery cell 10 and connected to the battery cell 10. The side of the battery cell 10 facing the cooling element 20 is provided with a first flow guide hole 13. The cooling element 20 is provided with a cooling channel 21 for the flow of cooling medium. The cooling element 20 is provided with a second flow guide hole 22 at a position corresponding to the first flow guide hole 13 and communicating with the cooling channel 21. The second flow guide hole 22 communicates with the first flow guide hole 13 to form a flow guide channel. The sealing assembly 30 includes a heat-melting sealing element 31 and a sealing element 32. The heat-melting sealing element 31 is sealed in the flow guide channel. The heat-melting sealing element 31 can be heated and melted when the battery cell 10 experiences thermal runaway to make the flow guide channel open. The sealing element 32 is disposed between the battery cell 10 and the cooling element 20 and surrounds the flow guide channel to seal the gap between the battery cell 10 and the cooling element 20.

[0026] In this embodiment, the first flow guide hole 13 of the battery cell 10 is connected to the second flow guide hole 22 of the cooling component 20 to form a flow guide channel, allowing cooling medium to be introduced into the cooling channel 21 of the cooling component 20. The heat-melting seal 31 of the sealing assembly 30 seals the flow guide channel. When the battery is working normally, the battery temperature is low, and the heat-melting seal 31 can effectively seal the flow guide channel. When the battery experiences thermal runaway, the heat-melting seal 31 is melted at high temperature, causing the flow guide channel to open. At this time, the cooling channel 21 communicates with the interior of the battery cell 10 through the flow guide channel, allowing the cooling medium in the cooling channel 21 to enter the battery cell 10 for cooling. Furthermore, by providing a seal 32 between the battery cell 10 and the cooling component 20, the seal 32 surrounds the flow guide channel to seal the gap between the battery cell 10 and the cooling component 20, thereby ensuring that the cooling medium can enter the battery cell 10 along the flow guide channel, reducing the leakage of the cooling medium, ensuring the cooling effect on the battery cell 10, and reducing the possibility of heat diffusion.

[0027] Among them, such as Figure 2 As shown, the battery cell 10 is the main component of the battery pack. The cooling component 20 is located on one side of the battery cell 10 and is connected to the battery cell 10. The side of the battery cell 10 facing the cooling component 20 is provided with a first flow guide hole 13, which is connected to the interior of the battery cell 10.

[0028] The cooling component 20 is provided with a cooling channel 21 for the flow of cooling medium, which can be cooling water, coolant, or fire extinguishing agent, etc. The cooling component 20 has a second guide hole 22 at a position corresponding to the first guide hole 13. The second guide hole 22 communicates with the cooling channel 21 and the first guide hole 13 to form a guide channel. When the guide channel is closed, the cooling medium in the cooling channel 21 cannot enter the battery cell 10 through the guide channel. When the guide channel is open, the cooling medium in the cooling channel 21 can enter the battery cell 10 through the guide channel.

[0029] like Figure 2 As shown, the sealing assembly 30 includes a heat-melting sealing member 31 and a sealing member 32. The heat-melting sealing member 31 seals the flow channel. The sealing member 32 is disposed between the battery cell 10 and the cooling member 20 and surrounds the flow channel to seal the gap between the battery cell 10 and the cooling member 20.

[0030] When the battery is operating normally, the temperature of the cell 10 is low, and the thermal seal 31 will not melt, effectively sealing the flow channel. When thermal runaway occurs in the cell 10, the thermal seal 31 melts, opening the flow channel and allowing the cooling medium in the cooling element 20 to enter the cell 10 along the flow channel, thus cooling the cell 10 and achieving rapid temperature reduction.

[0031] It should be noted that the heat-melting sealing component 31 can be made of a material that melts when heated, such as thermoplastic plastic. The heat-melting sealing component 31 is in a solid state at room temperature. When placed in the flow channel, it can seal the flow channel. When the temperature reaches a certain level, the heat-melting sealing component softens or even flows. Therefore, when the battery is operating normally, the temperature of the cell 10 is low, and the heat-melting sealing component 31 will not melt, remaining in a solid state to seal the flow channel. When the cell 10 experiences thermal runaway, the heat-melting sealing component 31 melts, changing from a solid state to a liquid state. The flow channel is opened, and the cooling medium in the cooling component 20 can enter the cell 10 along the flow channel to cool the cell 10. Of course, the material of the heat-melting sealing component 31 can be flexibly set according to actual conditions, and this embodiment does not limit this.

[0032] Optionally, such as Figure 2 , Figure 4 and Figure 5 As shown, the battery cell 10 has a first groove 12 on the side facing the cooling component 20. The first groove 12 surrounds the first guide hole 13. The sealing component 32 is disposed in the first groove 12 and abuts against the cooling component 20.

[0033] In this embodiment, a first groove 12 is provided on the side of the battery cell 10 facing the cooling component 20. A sealing component 32 is installed in the first groove 12, such that the sealing component 32 surrounds the first guide hole 13 and abuts against the cooling component 20, thereby sealing the gap between the battery cell 10 and the cooling component 20 and forming an annular seal on the guide channel. This prevents the cooling medium from leaking from the gap between the battery cell 10 and the cooling component 20 during thermal runaway, ensuring that the cooling medium enters the battery cell 10. In this embodiment, only the first groove 12 is machined on the battery cell 10, and the cooling component 20 does not need to have a groove machined, thereby reducing the manufacturing difficulty of the cooling component 20.

[0034] Specifically, such as Figure 2 , Figure 4 and Figure 5 As shown, the battery cell 10 has a first groove 12 on the side facing the cooling component 20. The first groove 12 is an annular groove. The first groove 12 surrounds the first guide hole 13. The sealing component 32 is disposed in the first groove 12 and abuts against the cooling component 20, thereby achieving an annular seal on the guide channel.

[0035] It should be noted that the battery cell 10 may include a battery cell body and a housing. The battery cell body is disposed in the housing, and the first flow guide hole 13 and the first groove 12 may both be disposed on the housing wall. The first flow guide hole 13 penetrates the housing wall, while the first groove 12 does not penetrate the housing wall. In other words, the first flow guide hole 13 is connected to the interior of the battery cell 10, while the first groove 12 is not connected to the interior of the battery cell 10.

[0036] Optionally, such as Figure 2 , Figure 6 and Figure 7 As shown, the cooling component 20 has a second groove 23 on the side facing the battery cell 10. The second groove 23 surrounds the second guide hole 22. The sealing component 32 is disposed in the second groove 23 and abuts against the battery cell 10.

[0037] In this embodiment, a second groove 23 is provided on the side of the cooling component 20 facing the battery cell 10. A sealing component 32 is installed in the second groove 23, such that the sealing component 32 surrounds the second flow guide hole 22 and abuts against the battery cell 10, thereby sealing the gap between the battery cell 10 and the cooling component 20. This also forms an annular seal on the flow guide channel, preventing the cooling medium from leaking from the gap between the battery cell 10 and the cooling component 20 during thermal runaway, ensuring that the cooling medium enters the battery cell 10. In this embodiment, the second groove 23 is only machined on the cooling component 20; the battery cell 10 does not need to have a groove machined, thus reducing the manufacturing difficulty of the battery cell 10.

[0038] Specifically, such as Figure 2 , Figure 6 and Figure 7As shown, the cooling component 20 has a second groove 23 on the side facing the battery cell 10. The second groove 23 is an annular groove that surrounds the second guide hole 22. The sealing component 32 is disposed in the second groove 23 and abuts against the battery cell 10, thereby achieving an annular seal on the guide channel. The second guide hole 22 penetrates the side of the cooling component 20 facing the battery cell 10, while the second groove 23 does not penetrate the side of the cooling component 20 facing the battery cell 10. It can also be understood that the second guide hole 22 is connected to the cooling channel 21, while the second groove 23 is not connected to the cooling channel 21.

[0039] Optionally, such as Figures 2 to 7 As shown, the battery cell 10 has a first groove 12 on the side facing the cooling component 20, and the first groove 12 surrounds the first guide hole 13. The cooling component 20 has a second groove 23 on the side facing the battery cell 10, and the second groove 23 surrounds the second guide hole 22. At least a portion of the sealing component 32 is disposed in the first groove 12, and at least another portion of the sealing component 32 is disposed in the second groove 23. Both the battery cell 10 and the cooling component 20 abut against the sealing component 32.

[0040] In this embodiment, a first groove 12 is provided on the side of the battery cell 10 facing the cooling component 20, and at least a portion of the sealing component 32 is disposed in the first groove 12. A second groove 23 is provided on the side of the cooling component 20 facing the battery cell 10, and at least another portion of the sealing component 32 is disposed in the second groove 23. This ensures that the sealing component 32 surrounds the first guide hole 13 and the second guide hole 22, and abuts against both the battery cell 10 and the cooling component 20, thereby sealing the gap between the battery cell 10 and the cooling component 20. This also forms an annular seal on the guide channel, preventing the cooling medium from leaking from the gap between the battery cell 10 and the cooling component 20 during thermal runaway, and ensuring that the cooling medium enters the battery cell 10. In this embodiment, grooves are machined on both the battery cell 10 and the cooling component 20, and the sealing component 32 is embedded in both grooves, improving the sealing effect.

[0041] Specifically, such as Figures 2 to 7 As shown, the battery cell 10 has a first groove 12 on the side facing the cooling component 20, and the cooling component 20 has a second groove 23 on the side facing the battery cell 10. The first groove 12 surrounds the first guide hole 13, and the second groove 23 surrounds the second guide hole 22. The first groove 12 and the second groove 23 form a receiving space for accommodating the sealing component 32. The sealing component 32 is disposed in the receiving space, that is, at least a portion of the sealing component 32 is disposed in the first groove 12, and at least another portion of the sealing component 32 is disposed in the second groove 23.

[0042] Optionally, such as Figure 2 and Figure 5As shown, the first guide hole 13 includes a first hole section 131 and a second hole section 132 that are interconnected. The battery cell 10 is provided with a first receiving cavity 11. The first hole section 131 is connected to the first receiving cavity 11. The second hole section 132 is located on the side of the first hole section 131 away from the first receiving cavity 11. The second hole section 132 is connected to the second guide hole 22. A first step is formed between the sidewall of the first hole section 131 and the sidewall of the second hole section 132. The hot melt sealing member 31 includes a first sealing section 311 and a second sealing section 312 that are interconnected. The first sealing section 311 is inserted into the first hole section 131, and the second sealing section 312 is inserted into the second hole section 132. A second step is formed between the first sealing section 311 and the second sealing section 312. The second step is limited and matched with the first step.

[0043] In this embodiment, the sidewalls of the first hole segment 131 and the second hole segment 132 form a first step portion, and the first sealing segment 311 and the second sealing segment 312 form a second step portion. Through the limiting cooperation of the first step portion and the second step portion, the good insertion of the heat-melting sealing member 31 and the first guide hole 13 is ensured, and the heat-melting sealing member 31 is prevented from moving relative to the battery cell 10.

[0044] Specifically, such as Figure 2 and Figure 5 As shown, the first flow guide hole 13 includes a first hole segment 131 and a second hole segment 132 that are interconnected. The first hole segment 131 is connected to the first receiving cavity 11 of the battery cell 10, and the second hole segment 132 is connected to the second flow guide hole 22. That is, the first hole segment 131 is close to the inside of the battery cell 10, and the second hole segment 132 is close to the outside of the battery cell 10. Moreover, the first hole segment 131 and the second hole segment 132 form a stepped hole structure, so that a first step portion is formed between the sidewall of the first hole segment 131 and the sidewall of the second hole segment 132. The hot-melt sealing component 31 includes a first sealing section 311 and a second sealing section 312 that are connected to each other. The first sealing section 311 is inserted into the first hole section 131, and the second sealing section 312 is inserted into the second hole section 132. The first sealing section 311 and the second sealing section 312 form a stepped shaft structure, thereby forming a second stepped part. The second stepped part and the first stepped part achieve a limiting fit, thereby realizing the insertion and installation of the hot-melt sealing component 31 and the first guide hole 13.

[0045] Optionally, such as Figure 2 As shown, the sealing assembly 30 also includes an adhesive layer 33, which is bonded between the first step portion and the second step portion.

[0046] In this embodiment, the adhesive layer 33 can be used to bond the first step portion and the second step portion together, thereby connecting the hot melt sealing member 31 to the first guide hole 13 and bonding the hot melt sealing member 31 to the battery cell 10.

[0047] Specifically, such as Figure 2 As shown, the sealing assembly 30 also includes an adhesive layer 33, which is bonded between the first step portion and the second step portion. The heat-melt sealing member 31 is connected inside the first guide hole 13, thereby achieving bonding between the heat-melt sealing member 31 and the battery cell 10. For example, the adhesive layer 33 can be a sealant to achieve bonding and sealing between the heat-melt sealing member 31 and the battery cell 10.

[0048] Optionally, such as Figure 1 As shown, the battery cell 10 has a first direction X and a second direction Y that are perpendicular to each other. There are multiple battery cells 10, which are arranged along the first direction X. The cooling element 20 is provided on one side of the multiple battery cells 10 along the second direction Y. The cooling element 20 is provided with a second flow guide hole 22 at a position corresponding to each battery cell 10. Each second flow guide hole 22 is connected to a first flow guide hole 13 of a battery cell 10 to form a flow guide channel.

[0049] In this embodiment, multiple battery cells 10 are arranged along a first direction X. Each battery cell 10 is provided with a first flow guide hole 13. The cooling component 20 is provided with multiple second flow guide holes 22, which are correspondingly arranged with the multiple first flow guide holes 13, thereby forming multiple flow guide channels to cool the multiple battery cells 10. When any one of the battery cells 10 experiences thermal runaway, the flow guide channel corresponding to that battery cell 10 is opened, and the cooling medium enters into that battery cell 10 to cool it.

[0050] Specifically, such as Figure 1 As shown, the battery pack contains multiple battery cells 10, which can be arranged along the first direction X. Correspondingly, the cooling component 20 is provided with multiple second flow guide holes 22, which form multiple flow guide channels with the first flow guide holes 13. In this way, when one of the battery cells 10 experiences thermal runaway, the cooling medium in the cooling component 20 can enter the battery cell 10 through the corresponding flow guide channels to cool the battery cell 10.

[0051] It should be noted that the first direction X and the second direction Y are perpendicular to each other. Specifically, they can be "perpendicular" in the strict sense, for example, the angle between the first direction X and the second direction Y is 90°; or they can be "approximately perpendicular", specifically meaning that the angle between the first direction X and the second direction Y includes a certain error. Considering the measurement and the error associated with the measurement of a specific quantity (i.e., the limitation of the measurement system), this error is within the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, the angle between the first direction X and the second direction Y is 90°±5°.

[0052] Optionally, the battery pack also includes a housing with a cavity having an opening and a bottom that are disposed opposite to each other. Multiple battery cells 10 are arranged in the cavity along a first direction X, and a cooling element 20 is disposed between the multiple battery cells 10 and the bottom of the cavity.

[0053] In this embodiment, the cooling component 20 is disposed at the bottom of the cavity, and the battery cell 10 is disposed above the cooling component 20. The first guide hole 13 is opened on the bottom wall of the battery cell 10, and the second guide hole 22 is opened on the top wall of the cooling component 20, thereby facilitating the installation of the cooling component 20 and the battery cell 10 in the housing.

[0054] Specifically, the battery pack also includes a housing, which forms a cavity, with a cooling element 20 installed at the bottom of the cavity and the battery cell 10 installed on the side of the cooling element 20 away from the bottom of the cavity.

[0055] Optionally, such as Figure 3 As shown, the battery pack also includes a thermally conductive adhesive layer 40, which is disposed between the cooling element 20 and the battery cell 10.

[0056] In this embodiment, the thermally conductive adhesive layer 40 can bond the cooling element 20 and the battery cell 10 together, while also enabling thermal conductivity between them. When the battery cell 10 is operating normally, the cooling medium within the cooling element 20 can cool the battery cell 10.

[0057] Specifically, such as Figure 3 As shown, the battery pack also includes a thermally conductive adhesive layer 40, which is disposed between the cooling element 20 and the battery cell 10, thereby achieving both bonding and thermal conductivity between the two. For example, the thermally conductive adhesive layer 40 can be formed by coating with thermally conductive adhesive, achieving both bonding and thermal conductivity.

[0058] It should be noted that, as Figure 3 As shown, the seal 32 is also located between the cooling element 20 and the battery cell 10. A clearance hole 41 can be formed on the thermally conductive adhesive layer 40 to achieve clearance of the seal 32.

[0059] In addition, the battery pack also includes a cooling system, which is connected to the cooling channel 21 and can supply cooling medium to the cooling channel 21.

[0060] For example, the cooling system may include a storage container and a delivery pipe, the storage container storing a cooling medium and the delivery pipe being connected to the storage container and the cooling component 20 to deliver the cooling medium.

[0061] The battery pack also includes a booster, one end of which is connected to the cooling unit 20 and the other end is connected to the cooling system. The booster can pressurize the cooling medium supplied to the cooling unit 20 by the cooling system, thereby increasing the pressure of the cooling medium and increasing the speed at which the cooling medium enters the cell 10 during thermal runaway, thus reducing the possibility of further deterioration of thermal runaway.

[0062] For example, the booster can be a water pump, which increases the speed at which the cooling medium enters the battery cell 10.

[0063] This application also provides an electrical device including the battery pack of any of the above embodiments.

[0064] In the embodiments of this application, since the electrical device includes the battery pack of any of the above embodiments, the first flow guide hole 13 of the battery cell 10 of the battery pack is connected to the second flow guide hole 22 of the cooling component 20 to form a flow guide channel, and a cooling medium can be introduced into the cooling channel 21 of the cooling component 20. The heat-melting seal 31 of the sealing assembly 30 seals the flow channel. When the battery is working normally, the battery temperature is low, and the heat-melting seal 31 can effectively seal the flow channel. When the battery experiences thermal runaway, the heat-melting seal 31 is melted by high temperature, causing the flow channel to open. At this time, the cooling channel 21 is connected to the inside of the cell 10 through the flow channel, and the cooling medium in the cooling channel 21 can enter the cell 10 to achieve cooling. Furthermore, by setting a seal 32 between the cell 10 and the cooling component 20, the seal 32 is arranged around the flow channel to seal the gap between the cell 10 and the cooling component 20, thereby ensuring that the cooling medium can enter the cell 10 along the flow channel, reducing the leakage of the cooling medium, ensuring the cooling effect on the cell 10, and reducing the possibility of heat diffusion.

[0065] Specifically, the electrical equipment can be electric vehicles, electric ships, or other electric transportation equipment, which can effectively prevent heat dissipation and reduce losses in the event of thermal runaway of the battery pack. Of course, the electrical equipment can also be other types of equipment, and can be flexibly set according to actual conditions; this application embodiment does not limit this.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The battery cell (10), cooling component (20), and sealing assembly (30) are provided on one side of the battery cell (10) and connected to the battery cell (10). The battery cell (10) has a first flow guide hole (13) on the side facing the cooling component (20). The cooling component (20) is provided with a cooling channel (21) for the flow of cooling medium. The cooling component (20) is provided with a second guide hole (22) at a position corresponding to the first guide hole (13) and communicating with the cooling channel (21). The second guide hole (22) communicates with the first guide hole (13) to form a guide channel. The sealing assembly (30) includes a heat-melting plug (31) and a seal (32). The heat-melting plug (31) is sealed in the flow channel. The heat-melting plug (31) can be heated and melted when the cell (10) experiences thermal runaway to make the flow channel open. The seal (32) is disposed between the cell (10) and the cooling element (20) and surrounds the flow channel to seal the gap between the cell (10) and the cooling element (20).

2. The battery pack according to claim 1, characterized in that, The battery cell (10) has a first groove (12) on the side facing the cooling component (20). The first groove (12) surrounds the first guide hole (13). The sealing component (32) is located in the first groove (12) and abuts against the cooling component (20).

3. The battery pack according to claim 1, characterized in that, The cooling component (20) has a second groove (23) on the side facing the battery cell (10). The second groove (23) surrounds the second flow guide hole (22). The sealing component (32) is located in the second groove (23) and abuts against the battery cell (10).

4. The battery pack according to claim 1, characterized in that, The battery cell (10) has a first groove (12) on the side facing the cooling component (20), the first groove (12) surrounds the first flow guide hole (13), and the cooling component (20) has a second groove (23) on the side facing the battery cell (10), the second groove (23) surrounds the second flow guide hole (22); at least a portion of the sealing component (32) is disposed in the first groove (12), and at least another portion of the sealing component (32) is disposed in the second groove (23); the battery cell (10) and the cooling component (20) both abut against the sealing component (32).

5. The battery pack according to any one of claims 1 to 4, characterized in that, The first flow guide hole (13) includes a first hole segment (131) and a second hole segment (132) that are interconnected. The battery cell (10) is provided with a first receiving cavity (11). The first hole segment (131) is connected to the first receiving cavity (11). The second hole segment (132) is located on the side of the first hole segment (131) away from the first receiving cavity (11). The second hole segment (132) is connected to the second flow guide hole (22). A first step is formed between the sidewall of the first hole segment (131) and the sidewall of the second hole segment (132). The hot-melt sealing component (31) includes a first sealing section (311) and a second sealing section (312) connected to each other. The first sealing section (311) is inserted into the first hole section (131), and the second sealing section (312) is inserted into the second hole section (132). A second step is formed between the first sealing section (311) and the second sealing section (312), and the second step is in a limiting fit with the first step.

6. The battery pack according to claim 5, characterized in that, The sealing assembly (30) further includes an adhesive layer (33) which is bonded between the first step portion and the second step portion.

7. The battery pack according to any one of claims 1 to 4, characterized in that, The battery cell (10) has a first direction (X) and a second direction (Y) that are perpendicular to each other. There are multiple battery cells (10), and the multiple battery cells (10) are arranged along the first direction (X). The cooling element (20) is disposed on one side of the plurality of battery cells (10) along the second direction (Y). The cooling element (20) is provided with a second flow guide hole (22) at a corresponding position to each of the battery cells (10). Each second flow guide hole (22) is connected to the first flow guide hole (13) of a battery cell (10) to form the flow guide channel.

8. The battery pack according to claim 7, characterized in that, It also includes a housing having a receiving cavity having an opening and a bottom opposite to each other, a plurality of the battery cells (10) being arranged in the receiving cavity along the first direction (X), and a cooling element (20) being disposed between the plurality of battery cells (10) and the bottom of the cavity.

9. The battery pack according to any one of claims 1 to 4, characterized in that, It also includes a thermally conductive adhesive layer (40) disposed between the cooling element (20) and the battery cell (10).

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

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