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. The plurality of single batteries are arranged in the box body, each single battery comprises a battery body and a pole, the battery body is provided with a first outer wall surface, and the pole is arranged on the first outer wall surface; the electric connecting piece comprises an electric connecting part and a first heat conduction part which are connected, the electric connecting part is electrically connected with the pole of the single battery, and the first heat conduction part and the first outer wall surface are opposite to each other and are arranged at an interval; and the first liquid cooling piece is arranged between the first heat conduction part and the first outer wall surface, and the first liquid cooling piece is in heat conduction connection with the first outer wall surface and the first heat conduction part. According to the battery pack, the liquid cooling heat dissipation structure in the battery pack is optimized, and the heat management performance of the battery pack is improved, so that 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. Liquid cooling systems are one of the core components of battery packs. Therefore, how to improve the liquid cooling effect of battery packs, thereby enhancing their safety performance, has become a pressing issue to be addressed. Utility Model Content

[0003] Embodiments of this application provide a battery pack and an electrical device to improve the thermal management performance of the battery pack, thereby enhancing 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 the one hand, a battery pack is provided, including: a housing;

[0006] Multiple individual batteries are disposed inside the box. Each individual battery includes: a battery body and a terminal post. The battery body has a first outer wall surface, and the terminal post is disposed on the first outer wall surface.

[0007] An electrical connector, comprising: an interconnected electrical connection portion and a first heat-conducting portion, wherein the electrical connection portion is electrically connected to the terminal of a single battery cell, and the first heat-conducting portion is disposed opposite to and spaced apart from a first outer wall surface; and

[0008] The first liquid cooling component is disposed between the first heat-conducting part and the first outer wall surface, and the first liquid cooling component is thermally connected to both the first outer wall surface and the first heat-conducting part.

[0009] In addition to one or more of the features disclosed above, or alternatively, the battery pack has a first orientation;

[0010] The electrical connector further includes a first adapter portion, which is connected to a first heat-conducting portion, and the first heat-conducting portion is disposed away from the first outer wall surface in a first direction relative to the electrical connector portion.

[0011] In addition to one or more of the features disclosed above, or alternatively, the pole has a second outer wall surface near the electrical connection portion;

[0012] In the first direction, the distance between the first outer wall surface and the second outer wall surface is H1mm, and the thickness of the first liquid cooling component is H2mm, satisfying: H2≥H1.

[0013] In addition to one or more of the features disclosed above, or as an alternative, the first liquid cooling component is spaced apart from the electrode post, and the first outer wall surface, the electrode post, the electrical connector, and the first liquid cooling component together form a first spacer cavity.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the battery pack further includes: a first thermally conductive adhesive layer and a second thermally conductive adhesive layer, wherein the first thermally conductive adhesive layer is disposed between the first liquid cooling component and the first outer wall surface, and the first thermally conductive adhesive layer thermally connects the first outer wall surface and the first liquid cooling component; and the second thermally conductive adhesive layer is disposed between the first liquid cooling component and the first thermally conductive portion, and the second thermally conductive adhesive layer thermally connects the first liquid cooling component and the first thermally conductive portion.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the electrical connector further includes: a second heat-conducting portion disposed on the side of the electrical connector away from the first heat-conducting portion, and the second heat-conducting portion being disposed opposite to the first outer wall surface;

[0016] The battery pack also includes a second liquid cooling component, disposed between the second heat-conducting part and the first outer wall surface, and the second liquid cooling component is thermally connected to both the first outer wall surface and the second heat-conducting part.

[0017] In addition to one or more of the features disclosed above, or alternatively, the battery pack has a first orientation;

[0018] The electrical connector further includes a second adapter portion, which is connected to a second heat-conducting portion, and the second heat-conducting portion is disposed away from the first outer wall surface in a first direction relative to the electrical connector portion.

[0019] In addition to one or more of the features disclosed above, or as an alternative, the second liquid cooling component is spaced apart from the electrode post, and the first outer wall surface, the electrode post, the electrical connector, and the second liquid cooling component together form a second spacer cavity.

[0020] In addition to one or more of the features disclosed above, or as an alternative, a first liquid cooling channel is provided in the first liquid cooling component, and a second liquid cooling channel is provided in the second liquid cooling component.

[0021] The battery pack also includes a main liquid inlet pipe and a main liquid outlet pipe. The main liquid inlet pipe is connected to the liquid inlets of the first liquid cooling channel and the second liquid cooling channel, respectively, and the main liquid outlet pipe is connected to the liquid outlets of the first liquid cooling channel and the second liquid cooling channel, respectively.

[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 achieves thermal conductivity between the electrical connection and the first liquid cooling component by setting a first heat-conducting part, thereby achieving thermal conductivity between the electrode and the first liquid cooling component, forming a heat dissipation structure of electrode-electrical connection-first heat-conducting part-first liquid cooling component. This ensures that the electrode can be fully utilized for heat dissipation when the single battery is working normally. At the same time, by thermally connecting the first liquid cooling component with the first outer wall surface of the single battery, a heat dissipation structure of first outer wall surface-first liquid cooling component is formed, ensuring that the first liquid cooling component can directly dissipate heat to the first outer wall surface when the single battery is working normally. This increases the heat transfer area, optimizes the liquid cooling structure in the battery pack, improves the thermal management performance of the battery pack, and thus improves the safety performance of the battery pack. In addition, by setting the first liquid cooling component between the first heat-conducting part and the first outer wall surface, this application allows the first liquid cooling component to fully utilize the space inside the housing, thereby reducing the space occupied by the first liquid cooling component and increasing the space occupied by the single battery in the battery pack. This makes the overall structure of the battery pack compact, improves the space utilization rate of the single battery in the battery pack, and thus improves 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 a three-dimensional structural view of a single battery cell, an electrical connector, and a first liquid cooler provided according to an embodiment of this application;

[0027] Figure 3 This is a cross-sectional view along the AA direction of a single cell, electrical connector, and first liquid cooler provided according to an embodiment of this application;

[0028] Figure 4 yes Figure 3 A magnified view of a section at point C;

[0029] Figure 5 This is a three-dimensional structural view of a single battery cell, an electrical connector, a first liquid cooler, and a second liquid cooler, provided according to embodiments of this application.

[0030] Figure 6 This is a cross-sectional view along the BB direction of a single cell, electrical connector, first liquid cooler, and second liquid cooler provided according to an embodiment of this application.

[0031] Figure 7 yes Figure 6 A magnified view of a section at point D.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Battery pack;

[0034] 110. Box body;

[0035] 120. Single cell; 121. Battery body; 1211. First outer wall surface; 122. Terminal post; 1221. Second outer wall surface;

[0036] 130. Electrical connector; 131. Electrical connection part; 132. First heat-conducting part; 133. First transition part; 134. Second heat-conducting part; 135. Second transition part; 136. First partition cavity; 137. Second partition cavity;

[0037] 141. First liquid cooling component; 1411. First liquid cooling channel; 142. Second liquid cooling component; 1421. Second liquid cooling channel; 143. Main liquid inlet pipe; 144. Main liquid outlet pipe;

[0038] 151. First thermally conductive adhesive layer; 152. Second thermally conductive adhesive layer;

[0039] 161. Third thermally conductive adhesive layer; 162. Fourth thermally conductive adhesive layer;

[0040] 170. Box lid. 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] With the rapid development of the new energy industry, the demand for high-lifespan, high-energy-density rechargeable batteries is increasing. The lifespan and energy density of rechargeable batteries in a battery pack are directly related to their own characteristics, but also to the pack's liquid cooling system. A good liquid cooling system can remove as much heat as possible from the rechargeable batteries during operation, allowing them to operate within their optimal temperature range. However, existing liquid cooling systems in battery packs have poor heat dissipation capabilities, failing to meet the heat dissipation requirements of rechargeable batteries during normal operation. Furthermore, existing liquid cooling systems occupy too much internal space in the battery pack, affecting the space utilization rate of the rechargeable batteries and consequently impacting the overall energy density of the battery pack.

[0046] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figures 1 to 7 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 in pairs. 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 in pairs. Here, "perpendicular" refers to a state where the angle formed by a line and a line, a line and a surface, or a surface and a surface is 89° to 91°.

[0047] Specifically, the battery pack 100 includes: a housing 110, individual cells 120, electrical connectors 130, a first liquid cooling component 141, and a housing cover 170.

[0048] Specifically, multiple individual battery cells 120 are provided, all of which are disposed within the housing 110. These individual battery cells 120 are arranged sequentially in the second direction X to form a battery pack, and multiple battery packs are arranged sequentially in the third direction Y. Each individual battery cell 120 includes a battery body 121 and a terminal post 122. The battery body 121 has a first outer wall surface 1211, and the terminal post 122 is disposed on the first outer wall surface 1211. The electrical connector 130 includes a connected electrical connection portion 131 and a first heat-conducting portion 132. The electrical connection portion 131 is electrically connected to the terminal post 122 of the individual battery cell 120. The first heat-conducting portion 132 is opposite to and spaced apart from the first outer wall surface 1211. Specifically, the first heat-conducting portion 132 and the first outer wall surface 1211 are opposite to and spaced apart in the first direction Z. The first liquid cooling component 141 is disposed between the first heat-conducting part 132 and the first outer wall surface 1211, and the first liquid cooling component 141 is thermally connected to both the first outer wall surface 1211 and the first heat-conducting part 132. The cover 170 closes the box body 110 to seal the battery pack 100 as a whole.

[0049] The battery pack 100 can be a three-tiered battery pack 100 consisting of individual cells 120, battery modules, and a battery pack. This means that the individual cells 120 are first grouped into battery modules, and then the battery modules are placed inside the housing 110 to form a battery pack. 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 a 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 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.

[0052] The single cell 120 can be a cylindrical cell, a prismatic cell, a pouch cell, or a cell of other shapes.

[0053] The battery body 121 may include a casing, electrode assembly, electrolyte, end caps, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives, used to wet the electrode assembly. The electrode assembly is the component in the single-cell battery 120 where electrochemical reactions occur, and there may be one or more electrode assemblies. The electrode assembly is mainly formed by stacking or winding a positive electrode, a separator, and a negative electrode. The portions of the positive and negative electrode with active material constitute the electrode body, while the portions 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 are electrically connected to the terminals 122 to form a current loop, enabling the single-cell battery 120 to function normally.

[0054] Among them, the aforementioned terminal 122 can be a positive terminal or a negative terminal. This application does not make specific limitations and can be selected according to the actual situation.

[0055] The electrode post 122 may be made of a conductive metal or other materials, but is not limited thereto. For example, the electrode post 122 may be made of copper or aluminum, but is not limited thereto.

[0056] The electrical connection portion 131 and the first heat-conducting portion 132 can be integrally formed, forming a one-piece structure. For example, the electrical connection portion 131 and the first heat-conducting portion 132 can be integrally die-cast. Alternatively, the electrical connection portion 131 and the first heat-conducting portion 132 can be separately arranged and fixedly connected, for example, the first heat-conducting portion 132 can be fixedly connected to the electrical connection portion 131 through welding or other processes. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the electrical connection portion 131 and the first heat-conducting portion 132 are integrally formed to facilitate the processing and forming of the electrical connector 130, thereby improving the overall assembly efficiency of the battery pack 100.

[0057] The electrical connection portion 131 and the first heat-conducting portion 132 are both made of conductive metal or other materials, but are not limited thereto. For example, the electrical connection portion 131 and the first heat-conducting portion 132 can both be made of copper or aluminum, but are not limited thereto.

[0058] The first liquid cooling component 141 is made of a thermally conductive material. For example, the first liquid cooling component 141 may be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0059] The first liquid cooling component 141 can be formed by aluminum extrusion.

[0060] Understandably, this application achieves a thermally conductive connection between the electrical connection 131 and the first liquid cooling component 141 by setting a first heat-conducting part 132, thereby achieving a thermally conductive connection between the terminal post 122 and the first liquid cooling component 141. This forms a heat dissipation structure of terminal post 122-electrical connection 131-first heat-conducting part 132-first liquid cooling component 141, ensuring that the terminal post 122 can be fully utilized for heat dissipation when the single battery 120 is working normally. At the same time, by thermally connecting the first liquid cooling component 141 to the first outer wall surface 1211 of the single battery 120, a heat dissipation structure of first outer wall surface 1211-first liquid cooling component 141 is formed. This ensures that the first liquid cooling component 141 can simultaneously and directly dissipate heat from the first outer wall surface 1211 when the single battery 120 is working normally, increasing the heat transfer area and optimizing the battery pack 1. The liquid cooling structure in the battery pack 100 improves the thermal management performance of the battery pack 100, thereby enhancing its safety performance. Simultaneously, by placing the first liquid cooling component 141 between the first heat-conducting part 132 and the first outer wall surface 1211, the first liquid cooling component 141 can fully utilize the space inside the housing 110, thus reducing the space occupied by the first liquid cooling component 141 and increasing the space occupied by the individual cells 120 of the battery pack 100. This results in a more compact overall structure of the battery pack 100, improving the space utilization rate of the individual cells 120 and thus increasing the energy density of the battery pack 100. Furthermore, while ensuring the normal operation of the electrical connector 130, the conductive cross-sectional area of ​​the electrical connector 130 can be increased, thereby reducing the internal resistance of the battery pack 100.

[0061] In one embodiment, reference is made to Figures 2 to 4 The electrical connector 130 further includes a first adapter 133, through which the electrical connector 131 is connected to the first heat-conducting part 132. The first heat-conducting part 132 is disposed away from the first outer wall surface 1211 in the first direction Z relative to the electrical connector 131, so as to ensure that there is sufficient space between the first heat-conducting part 132 and the first outer wall surface 1211 to accommodate the first liquid cooling component 141, thereby ensuring that the first liquid cooling component 141 has sufficient structural dimensions to ensure the liquid cooling heat dissipation effect of the first liquid cooling component 141 and improve the thermal management performance of the battery pack 100.

[0062] The electrical connection portion 131, the first heat-conducting portion 132, and the first adapter portion 133 can be integrally formed. For example, the electrical connection portion 131, the first heat-conducting portion 132, and the first adapter portion 133 can be integrally die-cast. Alternatively, the first adapter portion 133 can be separately disposed from the electrical connection portion 131 and the first heat-conducting portion 132, with the three parts fixedly connected. For example, the first adapter portion 133 can be fixedly connected to the electrical connection portion 131 and the first heat-conducting portion 132 respectively through welding or other processes. This application does not impose specific limitations and can be specifically configured according to actual circumstances. For example, in this application, the electrical connection portion 131, the first heat-conducting portion 132, and the first adapter portion 133 are integrally formed.

[0063] In one embodiment, reference is made to Figures 2 to 4 The terminal post 122 has a second outer wall surface 1221 near the electrical connection portion 131. In the first direction Z, the distance between the first outer wall surface 1211 and the second outer wall surface 1221 is H1mm, and the thickness of the first liquid cooling component 141 is H2mm, satisfying: H2≥H1. That is, the thickness H2mm of the first liquid cooling component 141 is not less than the distance H1mm between the first outer wall surface 1211 and the second outer wall surface 1221, so as to ensure that the first liquid cooling component 141 has sufficient structural dimensions, thereby ensuring that there is sufficient space inside the first liquid cooling component 141 for coolant circulation, ultimately ensuring the liquid cooling heat dissipation effect of the first liquid cooling component 141 and improving the thermal management performance of the battery pack 100.

[0064] The distance H1mm between the first outer wall surface 1211 and the second outer wall surface 1221 can be obtained by disassembling the actual battery pack 100 and measuring the distance between different positions on the individual battery cells 120 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 these.

[0065] The thickness H2mm of the first liquid-cooled component 141 can be obtained by disassembling the actual battery pack 100 and measuring the thickness at different locations on the first liquid-cooled component 141 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 these.

[0066] In one embodiment, to optimize the heat conduction effect between the first liquid cooling component 141 and the first outer wall surface 1211, and between the first liquid cooling component 141 and the first heat-conducting part 132, refer to Figures 2 to 4 In this application, the battery pack 100 further includes: a first thermally conductive adhesive layer 151 and a second thermally conductive adhesive layer 152. The first thermally conductive adhesive layer 151 is disposed between the first liquid cooling component 141 and the first outer wall surface 1211, and the first thermally conductive adhesive layer 151 thermally connects the first outer wall surface 1211 and the first liquid cooling component 141. The second thermally conductive adhesive layer 152 is disposed between the first liquid cooling component 141 and the first thermally conductive part 132, and the second thermally conductive adhesive layer 152 thermally connects the first liquid cooling component 141 and the first thermally conductive part 132.

[0067] The first thermally conductive adhesive layer 151 and the second thermally conductive adhesive layer 152 can be made of any one of silicone thermally conductive adhesive, polyurethane thermally conductive adhesive, silicone potting compound thermally conductive adhesive or acrylic thermally conductive adhesive, but are not limited to this.

[0068] This application provides a first thermally conductive adhesive layer 151 between the first liquid cooling component 141 and the first outer wall surface 1211, and a second thermally conductive adhesive layer 152 between the first liquid cooling component 141 and the first thermally conductive part 132. This ensures that when the single-cell battery 120 is operating normally, the first thermally conductive adhesive layer 151 enhances the heat transfer between the first liquid cooling component 141 and the first outer wall surface 1211, and the second thermally conductive adhesive layer 152 enhances the heat transfer between the first liquid cooling component 141 and the first thermally conductive part 132, thereby improving the thermal conductivity of the first liquid cooling component 141, the first outer wall surface 1211, and the first thermally conductive part 132. The heat conduction efficiency between the heat-conducting parts 132 is improved to ensure that the first liquid cooling component 141 can better dissipate heat from the first outer wall surface 1211 and the terminal post 122 of the single cell 120, thereby improving the overall heat dissipation effect of the single cell 120. At the same time, the first thermally conductive adhesive layer 151 and the second thermally conductive adhesive layer 152 connect the single cell 120, the electrical connector 130 and the first liquid cooling component 141 into a whole structure to reduce the overall amplitude of the battery pack 100, improve the overall rigidity of the battery pack 100 and weaken the adverse effects of the expansion of the single cell 120 in the battery pack 100.

[0069] In one embodiment, the first liquid cooling component 141 is spaced apart from the terminal post 122, and the first outer wall surface 1211, the terminal post 122, the electrical connector 130, and the first liquid cooling component 141 form a first spacer cavity 136 to prevent the first liquid cooling component 141 from contacting the terminal post 122 and causing a short circuit in the battery pack 100, thereby ensuring the safety performance of the battery pack 100.

[0070] In one embodiment, the first spacer cavity 136 may not be filled with a thermally conductive adhesive layer to reduce the production cost of the battery pack 100. In another embodiment, the first spacer cavity 136 may also be filled with a fifth thermally conductive adhesive layer (not shown in the figure) so that the terminal post 122 can be directly thermally connected to the first liquid cooling component 141, thereby improving the overall heat dissipation effect of the single battery cell 120.

[0071] When the first spacer cavity 136 is filled with the fifth thermally conductive adhesive layer, the pole post 122 is insulated from the first liquid cooling component 141.

[0072] In one embodiment, reference is made to Figures 5 to 7 The electrical connector 130 further includes a second heat-conducting part 134, which is disposed on the side of the electrical connector 131 away from the first heat-conducting part 132, and is disposed opposite to the first outer wall surface 1211. Specifically, the second heat-conducting part 134 and the first outer wall surface 1211 are disposed opposite to each other in the first direction Z.

[0073] The electrical connection portion 131 and the second heat-conducting portion 134 can be integrally formed, forming a one-piece structure. For example, the electrical connection portion 131 and the second heat-conducting portion 134 can be integrally die-cast. Alternatively, the electrical connection portion 131 and the second heat-conducting portion 134 can be separately arranged and fixedly connected, for example, the second heat-conducting portion 134 can be fixedly connected to the electrical connection portion 131 through welding or other processes. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the electrical connection portion 131 and the second heat-conducting portion 134 are integrally formed to facilitate the processing and forming of the electrical connector 130, thereby improving the overall assembly efficiency of the battery pack 100.

[0074] The second heat-conducting part 134 is made of a conductive metal or other material, but is not limited thereto. For example, the second heat-conducting part 134 may be made of copper or aluminum, but is not limited thereto.

[0075] Specifically, the battery pack 100 also includes a second liquid cooling component 142, which is disposed between the second heat-conducting part 134 and the first outer wall surface 1211, and is thermally connected to the first outer wall surface 1211 and the second heat-conducting part 134 of the single cell 120 respectively.

[0076] The second liquid cooling component 142 is made of a thermally conductive material. For example, the second liquid cooling component 142 may be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0077] The second liquid cooling component 142 can be formed by aluminum extrusion.

[0078] Understandably, this application achieves a thermally conductive connection between the electrical connection 131 and the second liquid cooling component 142 by setting a second heat-conducting part 134, thereby achieving a thermally conductive connection between the terminal 122 and the second liquid cooling component 142. This forms a heat dissipation structure of terminal 122-electrical connection 131-second heat-conducting part 134-second liquid cooling component 142, ensuring that the terminal 122 can be fully utilized for heat dissipation when the single cell 120 is working normally. At the same time, by thermally connecting the second liquid cooling component 142 to the first outer wall surface 1211 of the single cell 120, a heat dissipation structure of first outer wall surface 1211-second liquid cooling component 142 is formed. This ensures that when the single cell 120 is working normally, the second liquid cooling component 142 can simultaneously and directly dissipate heat from the first outer wall surface 1211, so that the first liquid cooling component 141 and the second liquid cooling component 142 jointly dissipate heat from the first outer wall surface 1211 and the terminal 122 of the single cell 120. 2. Liquid cooling further increases the heat transfer area, optimizes the liquid cooling structure in the battery pack 100, and further improves the thermal management performance of the battery pack 100, thereby improving the safety performance of the battery pack 100. At the same time, by placing the second liquid cooling component 142 between the second heat-conducting part 134 and the first outer wall surface 1211, the second liquid cooling component 142 can make full use of the space inside the housing 110, thereby reducing the space occupied by the second liquid cooling component 142 and increasing the space occupied by the individual battery cells 120 of the battery pack 100, making the overall structure of the battery pack 100 more compact, improving the space utilization rate of the individual battery cells 120 in the battery pack 100, thereby improving the energy density of the battery pack 100. At the same time, while ensuring the normal use of the electrical connector 130, the conductive cross-sectional area of ​​the electrical connector 130 is further increased, thereby reducing the internal resistance of the battery pack 100.

[0079] In one embodiment, reference is made to Figures 5 to 7 The electrical connector 130 further includes a second adapter 135, through which the electrical connector 131 is connected to the second heat-conducting part 134. The second heat-conducting part 134 is disposed away from the first outer wall surface 1211 in the first direction Z relative to the electrical connector 131, so as to ensure that there is sufficient space between the second heat-conducting part 134 and the first outer wall surface 1211 to accommodate the second liquid cooling component 142, thereby ensuring that the second liquid cooling component 142 has sufficient structural dimensions to ensure the liquid cooling heat dissipation effect of the second liquid cooling component 142 and improve the thermal management performance of the battery pack 100.

[0080] The electrical connection portion 131, the second heat-conducting portion 134, and the second adapter portion 135 can be integrally formed. For example, the electrical connection portion 131, the second heat-conducting portion 134, and the second adapter portion 135 can be integrally die-cast. Alternatively, the second adapter portion 135 can be separately disposed from the electrical connection portion 131 and the second heat-conducting portion 134, with the three parts fixedly connected. For example, the second adapter portion 135 can be fixedly connected to the electrical connection portion 131 and the second heat-conducting portion 134 respectively through welding or other processes. This application does not impose specific limitations and can be specifically configured according to actual circumstances. For example, in this application, the electrical connection portion 131, the second heat-conducting portion 134, and the second adapter portion 135 are integrally formed.

[0081] In one embodiment, reference is made to Figures 5 to 7 The thickness of the second liquid cooling component 142 is H3mm, satisfying: H3≥H1. That is, the thickness H3mm of the second liquid cooling component 142 is not less than the distance H1mm between the first outer wall surface 1211 and the second outer wall surface 1221, so as to ensure that the second liquid cooling component 142 has sufficient structural dimensions, thereby ensuring that there is sufficient space inside the second liquid cooling component 142 for coolant circulation, ultimately ensuring the liquid cooling heat dissipation effect of the second liquid cooling component 142 and improving the thermal management performance of the battery pack 100.

[0082] The thickness H3mm of the second liquid cooling component 142 can be obtained by disassembling the actual battery pack 100 and measuring the thickness at different locations on the second liquid cooling component 142 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 these.

[0083] In one embodiment, to optimize the heat conduction effect between the second liquid cooling component 142 and the first outer wall surface 1211, and between the second liquid cooling component 142 and the second heat-conducting part 134, refer to Figures 5 to 7 In this application, the battery pack 100 further includes: a third thermally conductive adhesive layer 161 and a fourth thermally conductive adhesive layer 162. The third thermally conductive adhesive layer 161 is disposed between the second liquid cooling component 142 and the first outer wall surface 1211, and the third thermally conductive adhesive layer 161 thermally connects the single cell 120 and the second liquid cooling component 142; the fourth thermally conductive adhesive layer 162 is disposed between the second liquid cooling component 142 and the second thermally conductive part 134, and the fourth thermally conductive adhesive layer 162 thermally connects the second liquid cooling component 142 and the second thermally conductive part 134.

[0084] The third thermally conductive adhesive layer 161 and the fourth thermally conductive adhesive layer 162 can be made of any one of silicone thermally conductive adhesive, polyurethane thermally conductive adhesive, silicone potting compound thermally conductive adhesive or acrylic thermally conductive adhesive, but are not limited to this.

[0085] This application provides a third thermally conductive adhesive layer 161 between the second liquid cooler 142 and the first outer wall surface 1211, and a fourth thermally conductive adhesive layer 162 between the second liquid cooler 142 and the second thermally conductive part 134. This ensures that when the single-cell battery 120 is operating normally, the third thermally conductive adhesive layer 161 enhances the heat transfer between the second liquid cooler 142 and the first outer wall surface 1211, and the fourth thermally conductive adhesive layer 162 enhances the heat transfer between the second liquid cooler 142 and the second thermally conductive part 134, thereby improving the performance of the second liquid cooler 142, the first outer wall surface 1211, and the second thermally conductive part 134. The heat conduction efficiency between parts 134 is improved to ensure that the second liquid cooling component 142 can better dissipate heat from the first outer wall surface 1211 and the terminal post 122 of the single cell 120, thereby improving the overall heat dissipation effect of the single cell 120. At the same time, the third thermally conductive adhesive layer 161 and the fourth thermally conductive adhesive layer 162 connect the single cell 120, the electrical connector 130 and the second liquid cooling component 142 into a whole structure, so as to further reduce the overall amplitude of the battery pack 100, further improve the overall rigidity of the battery pack 100, and weaken the adverse effects of the expansion of the single cell 120 in the battery pack 100.

[0086] In one embodiment, the second liquid cooling component 142 is spaced apart from the terminal post 122, and the first outer wall surface 1211, the terminal post 122, the electrical connector 130, and the second liquid cooling component 142 form a second spacer cavity 137 to prevent the second liquid cooling component 142 from contacting the terminal post 122 and causing a short circuit in the battery pack 100, thereby ensuring the safety performance of the battery pack 100.

[0087] In one embodiment, the second spacer cavity 137 may not be filled with a thermally conductive adhesive layer to reduce the production cost of the battery pack 100. In another embodiment, the second spacer cavity 137 may also be filled with a sixth thermally conductive adhesive layer (not shown in the figure) so that the terminal post 122 can be directly thermally connected to the second liquid cooler 142, thereby improving the overall heat dissipation effect of the single battery cell 120.

[0088] When the second spacer cavity 137 is filled with the sixth thermally conductive adhesive layer, the pole post 122 and the second liquid cooling component 142 are insulated from each other.

[0089] In one embodiment, reference is made to Figure 6 The first liquid cooling component 141 has a first liquid cooling channel 1411, and the second liquid cooling component 142 has a second liquid cooling channel 1421. The first liquid cooling channel 1411 and the second liquid cooling channel 1421 are used for the flow of coolant.

[0090] Specifically, refer to Figure 1The battery pack 100 also includes a main liquid inlet pipe 143 and a main liquid outlet pipe 144. The main liquid inlet pipe 143 is connected to the liquid inlets of the first liquid cooling channel 1411 and the second liquid cooling channel 1421, respectively, and the main liquid outlet pipe 144 is connected to the liquid outlets of the first liquid cooling channel 1411 and the second liquid cooling channel 1421, respectively.

[0091] Understandably, the coolant enters the first liquid cooling channel 1411 through the main inlet pipe 143 and the inlet of the first liquid cooling channel 1411, and enters the second liquid cooling channel 1421 through the main inlet pipe 143 and the inlet of the second liquid cooling channel 1421. The coolant from the first liquid cooling channel 1411 enters the main outlet pipe 144 through the outlet of the first liquid cooling channel 1411, and the coolant from the second liquid cooling channel 1421 enters the main outlet pipe 144 through the outlet of the second liquid cooling channel 1421, and is then discharged through the main outlet pipe 144.

[0092] This application improves the cooling control efficiency of the battery pack 100 by setting a main liquid inlet pipe 143 and a main liquid outlet pipe 144 to achieve synchronous control of the coolant in the first liquid cooling component 141 and the second liquid cooling component 142.

[0093] In one embodiment, in the second direction X, the spacing between two adjacent electrical connectors 130 is 5mm to 10mm to meet the electrical clearance and creepage distance requirements of the battery pack 100 under different designs and operating conditions, and to ensure the normal use of the battery pack 100.

[0094] The spacing between two adjacent electrical connectors 130 can be obtained by disassembling the actual battery pack 100 and measuring the spacing between the two adjacent electrical connectors 130 in the second direction X 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.

[0095] 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.

[0096] 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.

[0097] 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 by, The battery pack comprises: a box body; a plurality of single batteries arranged in the box body, the single battery comprising: a battery body having a first outer wall surface, and a pole arranged on the first outer wall surface; an electrical connector comprising: an electrical connection part electrically connected with the pole of the single battery, and a first heat conduction part arranged opposite to and spaced from the first outer wall surface; and a first liquid cooling part arranged between the first heat conduction part and the first outer wall surface, and the first liquid cooling part is in thermal conduction connection with the first outer wall surface and the first heat conduction part respectively.

2. The battery pack of claim 1, wherein, The battery pack has a first direction; the electrical connector further comprises: a first adapter part, the electrical connection part is connected with the first heat conduction part through the first adapter part, and the first heat conduction part is arranged away from the first outer wall surface in the first direction relative to the electrical connection part.

3. The battery pack of claim 2, wherein, The pole has a second outer wall surface close to the electrical connection part; in the first direction, the distance between the first outer wall surface and the second outer wall surface is H1 mm, and the thickness of the first liquid cooling part is H2 mm, and H2≥H1 is satisfied.

4. The battery pack of claim 1, wherein, The first liquid cooling part is arranged spaced from the pole, and the first outer wall surface, the pole, the electrical connector, and the first liquid cooling part enclose a first spacing cavity.

5. The battery pack of claim 1, wherein, The battery pack further comprises: a first heat conduction adhesive layer arranged between the first liquid cooling part and the first outer wall surface, and the first heat conduction adhesive layer is in thermal conduction connection with the first outer wall surface and the first liquid cooling part; and a second heat conduction adhesive layer arranged between the first liquid cooling part and the first heat conduction part, and the second heat conduction adhesive layer is in thermal conduction connection with the first liquid cooling part and the first heat conduction part.

6. The battery pack of claim 1, wherein, The electrical connector further comprises: a second heat conduction part arranged on the side of the electrical connection part away from the first heat conduction part, and the second heat conduction part is arranged opposite to and spaced from the first outer wall surface; The battery pack further comprises: a second liquid cooling part arranged between the second heat conduction part and the first outer wall surface, and the second liquid cooling part is in thermal conduction connection with the first outer wall surface and the second heat conduction part respectively.

7. The battery pack of claim 6, wherein, The battery pack has a first direction; The electrical connector further comprises: a second adapter part, the electrical connection part is connected with the second heat conduction part through the second adapter part, and the second heat conduction part is arranged away from the first outer wall surface in the first direction relative to the electrical connection part.

8. The battery pack of claim 7, wherein, The second liquid cooling part is arranged spaced from the pole, and the first outer wall surface, the pole, the electrical connector, and the second liquid cooling part enclose a second spacing cavity.

9. The battery pack of claim 6, wherein, The first liquid cooling part is provided with a first liquid cooling flow channel, and the second liquid cooling part is provided with a second liquid cooling flow channel; The battery pack further comprises: a total liquid inlet pipe and a total liquid outlet pipe, the total liquid inlet pipe is in communication with the liquid inlet of the first liquid cooling flow channel and the second liquid cooling flow channel respectively, and the total liquid outlet pipe is in communication with the liquid outlet of the first liquid cooling flow channel and the second liquid cooling flow channel respectively.

10. An electrical device, characterized by The battery pack comprises: the battery pack as claimed in any one of claims 1 to 9 is used as a power supply for the electric device.

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