Battery pack and electric device

Abstract

The embodiment of the utility model relates to the technical field of batteries, and particularly discloses a battery pack and a power utilization device, and the battery pack comprises a box body which is provided with a first accommodating cavity with an opening; the plurality of single batteries are arranged in the first accommodating cavity; the box cover covers the opening, and the box cover is connected with the box body; the heat dissipation element is provided with a containing cavity, the containing cavity is used for containing cooling liquid, the heat dissipation element comprises a heat dissipation part and a condensation part which are connected, the heat dissipation part is arranged between every two adjacent single batteries and is in heat conduction connection with the single batteries, and the condensation part is arranged at one end, close to the box cover, of the heat dissipation part and penetrates through the box cover; at least part of the condensation part is arranged on the side, away from the first containing cavity, of the box cover. According to the battery pack, it is guaranteed that the heat dissipation element efficiently dissipates heat and cools the single batteries, it is guaranteed that the single batteries normally work within the reasonable temperature, the heat dissipation performance of the heat dissipation element is improved, and finally the safety performance of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the rapid development of the new energy industry, battery packs with high energy density, long cycle life, and high safety performance have been widely used and developed, and the demand for battery packs with larger capacity, greater durability, and enhanced safety is urgent. Heat dissipation performance is one of the core performance characteristics of a battery pack. Therefore, how to improve the heat dissipation performance of battery packs, thereby enhancing their safety performance, has become a pressing issue that needs to be addressed. Utility Model Content

[0003] Embodiments of this application provide a battery pack and an electrical device to improve the heat dissipation performance of the battery pack, thereby improving the safety performance of the battery pack.

[0004] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0005] On one hand, a battery pack is provided, comprising: a housing having a first receiving cavity with an opening;

[0006] Multiple individual cells are arranged within the first receiving cavity;

[0007] A lid, positioned over the opening, and connected to the box body; and

[0008] The heat dissipation element has a receiving cavity for containing coolant, and the heat dissipation element includes: a heat dissipation part and a condensation part connected together. The heat dissipation part is disposed between two adjacent single cells and is thermally connected to the single cells. The condensation part is disposed at one end of the heat dissipation part near the cover and passes through the cover. At least part of the condensation part is disposed on the side of the cover away from the first receiving cavity.

[0009] In addition to one or more of the features disclosed above, or as an alternative, a plurality of adjacent individual cells are arranged to form a second receiving cavity, and a heat dissipation part is disposed within the second receiving cavity.

[0010] In addition to one or more of the features disclosed above, or as an alternative, a heat dissipation cavity is provided in the heat dissipation section for containing coolant, and a condensation cavity is provided in the condensation section, with the heat dissipation cavity and the condensation cavity communicating to form a receiving cavity.

[0011] In addition to one or more of the features disclosed above, or as an alternative, the heat dissipation element further includes: a fin portion disposed on the outer surface of the condensation portion on the side away from the first receiving cavity, and the fin portion being thermally connected to the external air.

[0012] In addition to one or more of the features disclosed above, or alternatively, the battery pack has a first orientation;

[0013] The condenser extends along the first direction, and multiple fins are provided, with the multiple fins arranged at intervals in the first direction.

[0014] In addition to one or more of the features disclosed above, or as an alternative, it may also include: a thermally conductive layer disposed between the heat dissipation part and the individual battery cell, and the thermally conductive layer being thermally connected to both the heat dissipation part and the individual battery cell.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the heat dissipation element may also include: a liquid-absorbing core layer disposed on the side of the heat dissipation section and the condensation section near the receiving cavity.

[0016] In addition to one or more of the features disclosed above, or alternatively, the battery pack has a first orientation;

[0017] The enclosure includes: a bottom wall, which is disposed opposite to the enclosure cover in a first direction;

[0018] The heat dissipation element also includes: an end cap, which is disposed on the side of the condensation part away from the heat dissipation part;

[0019] The guide section is located on the side of the heat dissipation section away from the condensation section, and the guide section and the bottom wall are spaced apart in the first direction.

[0020] In addition to one or more of the features disclosed above, or as an alternative, the lid is provided with a clearance hole through which the condenser passes;

[0021] The battery pack also includes a seal, which is located between the condenser and the cover.

[0022] On the other hand, a further electrical device is disclosed, which, in addition to one or more of the features disclosed above, or as an alternative, includes a battery pack as described in any of the preceding claims, the battery pack serving as a power source for the electrical device.

[0023] One of the above technical solutions has the following advantages or beneficial effects: This application connects the heat dissipation part of the heat dissipation element to the individual battery in a thermally conductive manner, and sets at least a portion of the condensation part of the heat dissipation element on the side of the cover away from the first receiving cavity, so as to ensure that the heat dissipation element can efficiently dissipate heat and cool the individual battery, thereby cooling the individual battery and ensuring that the individual battery can work normally within a reasonable temperature range, improving the heat dissipation performance of the heat dissipation element, and ultimately improving the safety performance of the battery pack; at the same time, there is no need to set other components to condense the coolant in the heat dissipation element, reducing costs and making the space occupancy rate of the individual batteries in the battery pack higher, thereby increasing the energy density of the battery pack. Attached Figure Description

[0024] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural view of the battery pack provided according to an embodiment of this application;

[0026] Figure 2 This is an exploded structural view of a battery pack according to an embodiment of this application;

[0027] Figure 3 This is a top view of the battery pack provided according to an embodiment of this application;

[0028] Figure 4 This is a partial cross-sectional view of the battery pack along the AA direction according to an embodiment of this application;

[0029] Figure 5 This is an exploded structural view of a single battery cell and a heat dissipation element provided according to an embodiment of this application;

[0030] Figure 6 This is a three-dimensional structural view of the heat dissipation element provided according to an embodiment of this application;

[0031] Figure 7 This is a front view of a heat dissipation element provided according to an embodiment of this application;

[0032] Figure 8 This is a cross-sectional view of the heat dissipation element along the BB direction according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Battery pack;

[0035] 110. Box body; 111. First receiving cavity; 112. Opening; 113. Bottom wall;

[0036] 120. Single cell; 121. Second receiving cavity;

[0037] 130. Box lid; 131. Clearance hole;

[0038] 140. Heat dissipation element; 141. Receiving cavity; 1411. Heat dissipation cavity; 1412. Condensation cavity; 142. Heat dissipation section; 143. Condensation section; 144. Fin section; 145. Liquid absorption core layer; 146. End cap section; 147. Guide section;

[0039] 150. Thermal conductive layer;

[0040] 160. Sealing components. Detailed Implementation

[0041] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0042] 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," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] There are two main types of cooling methods for existing battery packs: active cooling and passive cooling. Active cooling uses a serpentine cooling plate arranged on the side of the battery as a cooling structure. Driven by a compressor, refrigerant flows inside the serpentine cooling plate, ultimately carrying away heat. To improve the cooling effect, an additional cooling plate is added to the bottom or top of the battery. However, this method is costly and requires additional components, affecting the energy density of the battery pack. Passive cooling uses a bracket to arrange the batteries within it, with large gaps between the batteries forming air ducts for ventilation and cooling. However, this method results in a larger battery pack size and lower energy density.

[0046] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figures 1 to 8 This application provides a battery pack 100, which has a first direction Z, a second direction X, and a third direction Y that intersect each other. For example, the battery pack 100 has a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other. Here, "perpendicular" refers to a state where the angle formed by a line and a line, a line and a plane, or a plane is 89° to 91°.

[0047] Specifically, the battery pack 100 includes: a housing 110, individual batteries 120, a housing cover 130, and a heat dissipation element 140.

[0048] Specifically, the housing 110 is provided with a first receiving cavity 111 having an opening 112; multiple individual batteries 120 are provided, and the multiple individual batteries 120 are arranged in the first receiving cavity 111. For example, the multiple individual batteries 120 are arranged sequentially in the second direction X to form multiple battery packs, and the multiple battery packs are arranged sequentially in the third direction Y. The housing cover 130 covers the opening 112 and is connected to the housing 110; the heat dissipation element 140 is provided with a receiving cavity 141 for containing coolant.

[0049] The battery pack 100 can be a three-tiered battery pack 100 consisting of individual cells 120, battery modules, and a battery pack. Specifically, the individual cells 120 are first grouped into battery modules, and then the battery modules are placed inside the housing 110 to form the battery pack 100. Alternatively, it can be a two-tiered battery pack 100 consisting of individual cells 120 and a battery pack, where the individual cells 120 are directly housed inside the housing 110 to form the battery pack. No specific limitations are imposed in this application; the design can be tailored to the specific circumstances, as long as it does not affect the effectiveness of this application.

[0050] The enclosure 110 is made of ordinary steel or aluminum, but is not limited to these materials.

[0051] The lid of the box 130 is made of metal, but it is not limited to that.

[0052] The single cell 120 can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. For example, the single cell 120 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, or nickel-cadmium battery, but is not limited to these.

[0053] The single cell 120 can be a prismatic cell, a pouch cell, or a cell of other shapes. For example, in this application, the single cell 120 is a cylindrical cell.

[0054] The single-cell battery 120 may include electrode components, electrolyte, casing, end caps, terminals, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives, used to wet the electrode components. The electrode components are the parts in the single-cell battery 120 where electrochemical reactions occur, and there may be one or more electrode components. The electrode components are mainly formed by stacking or winding positive electrode sheets, separators, and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. During the charging and discharging process of the single-cell battery 120, the positive and negative active materials react with the electrolyte, and the tabs and terminals are electrically connected to form a current loop, enabling the single-cell battery 120 to function normally.

[0055] The heat dissipation element 140 is made of a thermally conductive material. For example, the heat dissipation element 140 may be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0056] Specifically, the heat dissipation element 140 includes a heat dissipation section 142 and a condensation section 143 connected together. The heat dissipation section 142 is disposed between two adjacent single cells 120 and is thermally connected to the single cell 120. The condensation section 143 is disposed at one end of the heat dissipation section 142 near the cover 130. The condensation section 143 passes through the cover 130, and at least a portion of the condensation section 143 is disposed on the side of the cover 130 away from the first receiving cavity 111, that is, at least a portion of the condensation section 143 is disposed on the outside of the housing 110.

[0057] The heat dissipation part 142 and the condensation part 143 can be integrally formed, that is, the heat dissipation part 142 and the condensation part 143 are a one-piece structure. For example, the heat dissipation part 142 and the condensation part 143 are integrally die-cast. Alternatively, the heat dissipation part 142 and the condensation part 143 can be separately arranged and fixedly connected to each other. For example, the heat dissipation part 142 is fixedly connected to the condensation part 143 by welding. This application does not make specific limitations and can be specifically set according to the actual situation. For example, in this application, the heat dissipation part 142 and the condensation part 143 are integrally formed to facilitate the processing and forming of the heat dissipation element 140.

[0058] Understandably, when the individual cells 120 in the battery pack 100 are working normally, the individual cells 120 will generate heat synchronously. At the same time, since the heat dissipation part 142 of the heat dissipation element 140 is thermally connected to the individual cells 120, the heat dissipation part 142 and the individual cells 120 exchange heat. The heat generated when the individual cells 120 are working normally is conducted to the heat dissipation part 142, and then conducted to the coolant located in the receiving cavity 141 through the heat dissipation part 142. After the coolant absorbs heat and reaches a certain temperature, it vaporizes into gas. The gas after the coolant vaporizes is transported to the condenser part 143. Since at least part of the condenser part 143 is located on the outside of the housing 110, at least part of the condenser part 143 is thermally connected to the outside air, so that the gas after the coolant vaporizes exchanges heat with the outside air in the condenser part 143, and the gas condenses into liquid. The liquid coolant is transported to the receiving cavity 141 located in the heat dissipation part 142 due to its own gravity, thus forming a heat dissipation cycle.

[0059] This application achieves efficient heat dissipation and cooling of the individual battery 120 by connecting the heat dissipation part 142 of the heat dissipation element 140 to the individual battery 120 through thermal conductivity, and by placing at least a portion of the condensation part 143 of the heat dissipation element 140 on the side of the cover 130 away from the first receiving cavity 111. This ensures that the heat dissipation element 140 efficiently dissipates heat from and cools the individual battery 120, thereby reducing the temperature of the individual battery 120 and ensuring that the individual battery 120 operates normally within a reasonable temperature range. This improves the heat dissipation performance of the heat dissipation element 140 and ultimately enhances the safety performance of the battery pack 100. At the same time, it eliminates the need for additional components to condense the coolant inside the heat dissipation element 140, reducing costs and allowing for a higher space utilization rate of the individual battery 120 in the battery pack 100, thereby increasing the energy density of the battery pack 100.

[0060] In one embodiment, a heat dissipation cavity 1411 is provided in the heat dissipation part 142 for containing coolant, and a condensation cavity 1412 is provided in the condensation part 143. The heat dissipation cavity 1411 and the condensation cavity 1412 are connected to form a receiving cavity 141.

[0061] Specifically, when the individual cells 120 in the battery pack 100 are operating normally, the individual cells 120 will generate heat synchronously. At the same time, since the heat dissipation part 142 of the heat dissipation element 140 is thermally connected to the individual cells 120, heat exchange occurs between the heat dissipation part 142 and the individual cells 120. The heat generated when the individual cells 120 are operating normally is conducted to the heat dissipation part 142, and then to the coolant located in the heat dissipation cavity 1411. After the coolant absorbs heat and reaches a certain temperature, it vaporizes into a gas. The vaporized gas is transported to the condensation cavity 1412. Since at least part of the condensation part 143 is located on the outside of the housing 110, and at least part of the condensation part 143 is thermally connected to the outside air, the vaporized gas of the coolant exchanges heat with the outside air in the condensation cavity 1412, thereby condensing the gas into a liquid state. The liquid coolant is transported to the heat dissipation cavity 1411 due to its own gravity, thus forming a heat dissipation cycle.

[0062] In one embodiment, in order to improve the condensation effect of the condensation section 143, the heat dissipation element 140 further includes a fin section 144, which is disposed on the outer surface of the condensation section 143 on the side away from the first receiving cavity 111, and the fin section 144 is thermally connected to the external air.

[0063] The finned portion 144 and the condenser portion 143 can be integrally formed, meaning they are a single, integrated structure. For example, the finned portion 144 and the condenser portion 143 can be integrally die-cast. Alternatively, the finned portion 144 and the condenser portion 143 can be separately arranged and fixedly connected to each other. For example, the finned portion 144 can be fixedly connected to the condenser portion 143 by welding. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the finned portion 144 and the condenser portion 143 are integrally formed to facilitate the processing and forming of the heat dissipation element 140.

[0064] The fin portion 144 is made of a thermally conductive material. For example, the fin portion 144 may be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0065] This application provides a finned portion 144 on the outer surface of the condenser portion 143 on the side away from the first receiving cavity 111. The finned portion 144 increases the contact area with the outside air, thereby improving the condensation effect of the condenser portion 143. This further ensures that the heat dissipation element 140 can efficiently dissipate heat and cool the single cell 120, improves the heat dissipation performance of the heat dissipation element 140, and ultimately improves the safety performance of the battery pack 100.

[0066] In one embodiment, in order to improve the condensation effect of the condensation section 143, the condensation section 143 extends along the first direction Z, and multiple fin sections 144 are provided. The multiple fin sections 144 are arranged at intervals in the first direction Z, so as to further utilize the fin sections 144 to increase the contact area with the external air, thereby improving the condensation effect of the condensation section 143, further ensuring that the heat dissipation element 140 can efficiently dissipate heat and cool the single battery 120, improving the heat dissipation performance of the heat dissipation element 140, and ultimately improving the safety performance of the battery pack 100.

[0067] In one embodiment, the condensation effect of the condenser 143 can be adjusted by adjusting the number and area of ​​the fin portion 144, thereby adjusting the heat dissipation effect of the heat dissipation element 140 and reducing the temperature difference of the single cell 120.

[0068] In one embodiment, a plurality of adjacent individual cells 120 surround a second receiving cavity 121, and a heat dissipation part 142 is disposed in the second receiving cavity 121, so that the overall structure of the battery pack 100 is compact, thereby improving the space occupancy rate of the individual cells 120 of the battery pack 100 and thus improving the energy density of the battery pack 100.

[0069] In one embodiment, in order to optimize the heat conduction effect between the heat dissipation element 140 and the single battery 120, the battery pack 100 further includes a heat conduction layer 150, which is disposed between the heat dissipation part 142 and the single battery 120, and is heat-conductingly connected to the heat dissipation part 142 and the single battery 120 respectively.

[0070] The thermally conductive layer 150 may be made of any one of the following: silicone thermally conductive adhesive, polyurethane thermally conductive adhesive, silicone potting compound thermally conductive adhesive, acrylic thermally conductive adhesive, or phase change material, but is not limited to this.

[0071] Understandably, this application provides a heat-conducting layer 150 between the heat dissipation part 142 and the single battery 120 to ensure that when the single battery 120 is working normally, the heat-conducting layer 150 enhances the heat transfer between the heat dissipation part 142 and the single battery 120, improves the heat conduction efficiency between the heat dissipation part 142 and the single battery 120, and ensures that the heat dissipation element 140 can better perform liquid cooling heat dissipation on the single battery 120, thereby improving the heat dissipation effect of the single battery 120.

[0072] In one embodiment, the heat dissipation element 140 further includes a liquid-absorbing core layer 145, which is disposed on the side of the heat dissipation part 142 and the condensation part 143 near the receiving cavity 141, so as to facilitate the circulation of coolant in the heat dissipation element 140 and ensure the heat dissipation performance of the heat dissipation element 140.

[0073] The liquid-absorbing core layer 145 is made of a capillary material, but is not limited to this.

[0074] In one embodiment, the housing 110 includes a bottom wall 113, which is disposed opposite to the housing cover 130 in a first direction Z.

[0075] The heat dissipation element 140 further includes an end cap 146 and a guide 147. The end cap 146 covers the side of the condensation part 143 away from the heat dissipation part 142. The guide 147 is disposed on the side of the heat dissipation part 142 away from the condensation part 143, and the guide 147 and the bottom wall 113 are spaced apart in the first direction Z, so as to facilitate the placement of the heat dissipation element 140 in the second receiving cavity 121, improve the assembly efficiency of the battery pack 100, and prevent the heat dissipation element 140 from colliding with the housing 110 of the battery pack 100 and being damaged, thus ensuring the normal use of the heat dissipation element 140.

[0076] The end cap 146 and the condenser portion 143 can be integrally formed, meaning they are a single, one-piece structure. For example, the end cap 146 and the condenser portion 143 can be integrally die-cast. Alternatively, the end cap 146 and the condenser portion 143 can be separately arranged and fixedly connected to each other. For example, the end cap 146 can be fixedly connected to the condenser portion 143 by welding. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the end cap 146 and the condenser portion 143 are welded together to facilitate the injection of coolant.

[0077] The guide portion 147 and the heat dissipation portion 142 can be integrally formed, that is, the guide portion 147 and the heat dissipation portion 142 are a one-piece structure. For example, the guide portion 147 and the heat dissipation portion 142 are integrally die-cast. Alternatively, the guide portion 147 and the heat dissipation portion 142 can be separately arranged and fixedly connected to each other. For example, the guide portion 147 is fixedly connected to the heat dissipation portion 142 by welding. This application does not make specific limitations and can be specifically set according to the actual situation. For example, in this application, the guide portion 147 and the heat dissipation portion 142 are integrally formed to facilitate the processing and forming of the heat dissipation element 140.

[0078] The guide portion 147 is tapered, but is not limited to this.

[0079] In one embodiment, the distance between the guide portion 147 and the bottom wall 113 is H1 mm, and the dimension of the single cell 120 in the first direction Z is H2 mm, satisfying: 1 / 5 ≤ H1 / H2 ≤ 1 / 3. That is, the ratio of the distance H1 mm between the guide portion 147 and the bottom wall 113 and the dimension H2 mm of the single cell 120 in the first direction Z can be controlled within the range of 1 / 5 to 1 / 3. For example, H1 / H2 can be one of 1 / 5, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, or 1 / 3, or any combination thereof. The specific values ​​of H1 / H2 given above are only illustrative examples, and any value within the range of 1 / 5 to 1 / 3 is within the protection scope of this application.

[0080] The distance H1 mm between the guide portion 147 and the bottom wall 113 can be obtained by disassembling the actual battery pack 100 and measuring the distance between the guide portion 147 of the heat dissipation element 140 and the bottom wall 113 of the housing 110 multiple times using a measuring tool, and then calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to this.

[0081] The dimension H2 mm of the individual battery cell 120 in the first direction Z can be obtained by disassembling the actual battery pack 100 and measuring the dimension of the individual battery cell 120 in the first direction Z multiple times using a measuring tool and calculating the average value. The measuring tool can be any one of the following, but is not limited to: a ruler, vernier calipers, or other dimensional measuring instruments.

[0082] This application controls the ratio of the distance H1 mm between the guide portion 147 and the bottom wall 113 to the dimension H2 mm of the single cell 120 in the first direction Z within the range of 1 / 5 to 1 / 3, so that the heat dissipation element 140 will collide with the casing 110 of the battery pack 100 and be damaged, thus ensuring the normal use of the heat dissipation element 140 and ensuring the heat dissipation effect of the heat dissipation element 140.

[0083] In one embodiment, the cover 130 is made of heat-insulating material to separate the heat dissipation part 142 and the condensation part 143 of the heat dissipation element 140, thereby ensuring the heat dissipation effect of the heat dissipation element 140.

[0084] In one embodiment, the cover 130 is provided with a clearance hole 131, and the condenser part 143 passes through the clearance hole 131.

[0085] The battery pack 100 also includes a seal 160, which is disposed between the condenser 143 and the cover 130 to ensure the sealing effect between the condenser 143 and the cover 130, thereby ensuring the overall sealing effect of the housing 110, so as to isolate the inside of the housing 110 from the outside and prevent damage to the battery pack 100.

[0086] The seal 160 may be made of potting compound or sealant, but is not limited to these.

[0087] On the other hand, in the embodiments of this application, this application also provides an electrical device, including: a battery pack 100 as described in any of the above embodiments, wherein the battery pack 100 serves as a power supply for the electrical device.

[0088] Among them, electrical devices may include, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0089] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A battery pack, characterized in that, include: The housing has a first receiving cavity with an open opening; Multiple individual battery cells are arranged within the first receiving cavity; A lid is provided over the opening, and the lid is connected to the box body; as well as A heat dissipation element is provided with a receiving cavity for containing coolant. The heat dissipation element includes a heat dissipation section and a condensation section connected together. The heat dissipation section is disposed between two adjacent individual cells and is thermally connected to the individual cells. The condensation section is disposed at one end of the heat dissipation section near the cover and passes through the cover. At least a portion of the condensation section is disposed on the side of the cover away from the first receiving cavity.

2. The battery pack as described in claim 1, characterized in that, The adjacent individual cells are arranged to form a second receiving cavity, and the heat dissipation part is disposed in the second receiving cavity.

3. The battery pack as described in claim 1, characterized in that, The heat dissipation section has a heat dissipation cavity for containing coolant, and the condensation section has a condensation cavity. The heat dissipation cavity and the condensation cavity are connected to form the receiving cavity.

4. The battery pack as described in any one of claims 1 to 3, characterized in that, The heat dissipation element further includes a finned portion disposed on the outer surface of the condensation portion away from the first receiving cavity, and the finned portion is thermally connected to the external air.

5. The battery pack as described in claim 4, characterized in that, The battery pack has a first orientation; The condensation section extends along the first direction, and multiple fin sections are provided, with the multiple fin sections arranged at intervals in the first direction.

6. The battery pack as described in claim 1, characterized in that, Also includes: A thermally conductive layer is disposed between the heat dissipation part and the single battery cell, and the thermally conductive layer is thermally connected to both the heat dissipation part and the single battery cell.

7. The battery pack as described in claim 1, characterized in that, The heat dissipation element further includes a liquid-absorbing core layer, disposed on the side of the heat dissipation section and the condensation section near the receiving cavity.

8. The battery pack as claimed in claim 1, characterized in that, The battery pack has a first orientation; The box body includes: a bottom wall, which is disposed opposite to the box cover in the first direction; The heat dissipation element further includes: an end cap portion, which is disposed on the side of the condensation portion away from the heat dissipation portion; A guide portion is disposed on the side of the heat dissipation portion away from the condensation portion, and the guide portion and the bottom wall are spaced apart in the first direction.

9. The battery pack as claimed in claim 1, characterized in that, The cover is provided with a clearance hole, and the condenser part passes through the clearance hole; The battery pack further includes a seal disposed between the condenser section and the cover.

10. An electrical device, characterized in that, include: The battery pack according to any one of claims 1 to 9, wherein the battery pack serves as the power supply for the electrical device.

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