Battery pack and energy storage equipment

Abstract

The invention provides a battery pack and electric equipment, the battery pack comprises a battery cell assembly, a shell and a first component, the battery cell assembly comprises a plurality of battery cells, and each battery cell comprises a battery cell shell and an electrode terminal; the battery core assembly is positioned in the shell; the first component comprises an insulating part and a first heat conducting part fixed on the insulating part, an exposed area exposed out of the insulating part is arranged on one side, facing the battery core assembly, of the first heat conducting part, the exposed area is connected with at least one electrode terminal, and / or the battery core assembly comprises a busbar connected with the electrode terminal, and the exposed area is connected with the busbar; the first heat-conducting piece is connected with the shell; or the shell is provided with a first opening communicated with the outside of the battery pack, and part of the first heat conduction piece is exposed out of the first opening.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack and energy storage device. Background Technology

[0002] High-rate charging and discharging conditions can cause excessively high cell temperatures, especially at the cell electrode terminals, which can generate a lot of heat and affect the battery pack's performance. Summary of the Invention

[0003] This application provides a battery pack and energy storage device to improve the heat dissipation capacity of the battery pack.

[0004] In a first aspect, this application provides a battery pack, the battery pack including a cell assembly, a casing, and a first component. The cell assembly includes a plurality of cells, each cell including a cell housing and electrode terminals. The cell assembly is located inside the casing. The first component includes an insulating member and a first thermally conductive member fixed to the insulating member. The first thermally conductive member has an exposed area on the side facing the cell assembly that is exposed to the insulating member. The exposed area is connected to at least one electrode terminal. And / or the cell assembly includes a busbar connecting the electrode terminals, and the exposed area is connected to the busbar. The first thermally conductive member is connected to the casing. Or, the casing is provided with a first opening communicating with the outside of the battery pack, and a portion of the first thermally conductive member is exposed through the first opening.

[0005] The heat from the electrode terminals is conducted to the first heat-conducting element through the exposed area, and then conducted to the outer casing through the first heat-conducting element or dissipated to the outside of the outer casing through the first opening. This improves the heat dissipation effect on the electrode terminals, reduces the risk of thermal runaway of the battery pack, and helps to improve the safety of the battery pack.

[0006] In one or more of the above optional examples, the first heat-conducting component is a metal component. This results in a high thermal conductivity for the first heat-conducting component, which can quickly conduct heat from the welding area to the outer casing, further improving the heat dissipation effect on the electrode terminals, further reducing the risk of thermal runaway of the battery pack, and thus contributing to further improving the safety of the battery pack.

[0007] In one or more of the above optional examples, the electrode terminals of two adjacent cells are connected to form a welded area; an exposed area is located above and connected to at least one welded area, and / or the exposed area is located above and connected to the busbar. The shorter heat conduction path between the welded area and the exposed area and / or the busbar increases the speed at which heat is conducted from the welded area to the exposed area, improving the heat dissipation efficiency of the battery pack, reducing the risk of thermal runaway, and ultimately enhancing the safety of the battery pack.

[0008] In one or more of the above optional examples, the electrode terminals of two adjacent cells are stacked and welded to form a welding area.

[0009] In one or more of the above optional examples, the battery pack includes a second thermally conductive element disposed between the welded area and the exposed area, connecting the welded area and the exposed area; and / or, the second thermally conductive element disposed between the busbar and the exposed area, connecting the busbar and the exposed area. The second thermally conductive element can quickly conduct heat from the welded area to the exposed area, which helps improve the heat dissipation efficiency of the battery pack, reduces the risk of thermal runaway, and improves the safety of the battery pack.

[0010] In one or more of the above optional examples, the second thermally conductive component and the exposed area are in contact connection. This helps improve the heat dissipation efficiency of the battery pack, reduces the risk of thermal runaway, and improves the safety of the battery pack.

[0011] In one or more of the above optional examples, the thermal conductivity of the second heat-conducting component is greater than or equal to 1 W / (m·K). A higher thermal conductivity of the second heat-conducting component is beneficial for improving the heat dissipation efficiency of the battery pack.

[0012] In one or more of the above optional examples, the insulating member has a second opening, the exposed area closes the second opening and connects with the insulating member to form a first groove, and at least a portion of the second heat-conducting member is disposed within the first groove. The first groove serves to limit the second heat-conducting member, reducing the risk of the second heat-conducting member detaching from the exposed area and improving the heat dissipation reliability of the battery pack.

[0013] In one or more of the above optional examples, the battery pack includes a potting resin located between the cell assembly and the first component, the potting resin encapsulating the welding area and a portion of the second thermally conductive component. The potting resin improves the sealing and insulation protection of the electrode terminals, reducing the risk of short circuits caused by contact between the electrode terminals and other components.

[0014] In one or more of the above optional examples, the potting resin includes at least one of polyurethane adhesive, epoxy resin adhesive, and silicone resin.

[0015] In one or more of the above alternative examples, the first component has a recess facing the cell assembly, and the potting resin and the soldering area are located within the recess, the potting resin bonding the soldering area to the first component. By making the first component have a recess, it is convenient to place the potting resin within the recess.

[0016] In one or more of the above optional examples, the thermal conductivity of the potting resin is less than that of the first thermally conductive element, and the thermal conductivity of the potting resin is less than that of the second thermally conductive element. The heat from the electrode terminals is mainly transferred to the housing through the second thermally conductive element and the first thermally conductive element, or dissipated to the outside of the housing through the first opening.

[0017] In one or more of the above optional examples, the thermal conductivity of the potting resin is 0.1 W / (m·K) - 0.3 W / (m·K). Due to the low thermal conductivity of the potting resin, the electrode terminals primarily dissipate heat through the second and first thermally conductive elements.

[0018] In one or more of the above optional examples, the side of the first thermally conductive element facing away from the cell assembly is at least partially exposed to the insulating element; the insulating element and the first thermally conductive element are integrally injection molded, with the insulating element covering the free end of the main body. This results in better sealing between the insulating element and the free end of the first thermally conductive element, reducing the risk of moisture seeping into the battery pack through the free end.

[0019] In one or more of the above optional examples, the second thermal conductive element includes a silicone thermal pad. This results in better thermal conductivity and higher thermal efficiency for the second thermal conductive element.

[0020] In one or more of the above optional examples, the first thermal conductive element includes a main body and at least one extension. The extension is connected to the main body and extends along a second direction. The main body is located above the cell assembly, and the extension is located on one side of the cell assembly along a first direction, and / or, the extension is located on one side of the cell assembly along a third direction, where the first direction is perpendicular to the second direction and the second direction is perpendicular to the third direction. The extension is exposed outside the insulating element and connected to the housing, or at least a portion of the extension is exposed through a first opening. A larger connection area between the first thermal conductive element and the housing, and a larger thermal conductivity area between the first thermal conductive element and the housing, are beneficial for improving the heat dissipation efficiency of the battery pack, reducing the risk of thermal runaway of the battery pack, and improving the safety of the battery pack.

[0021] In one or more of the above optional examples, the battery pack includes a third thermal conductive element disposed between the extension and the housing, connecting the extension and the housing. The third thermal conductive element can quickly conduct heat from the extension to the housing, which helps improve the heat dissipation efficiency of the battery pack, reduces the risk of thermal runaway, and improves the safety of the battery pack.

[0022] In one or more of the above optional examples, the thermal conductivity of the third heat-conducting component is greater than or equal to 1 (W / (m·K). The higher thermal conductivity of the third heat-conducting component is beneficial to improving the heat dissipation efficiency of the battery pack.

[0023] In one or more of the above optional examples, the battery pack includes a circuit board and conductive components. Connectors are provided on the circuit board, and the conductive components connect to the battery cell assembly. The conductive components pass through a first component and are connected to the circuit board and / or the connectors. The first component serves to fix the conductive components, resulting in higher connection stability.

[0024] Secondly, this application provides an electrical device including at least one battery pack as described above. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the exploded structure of a battery pack provided as an example in this application; Figure 2 This is a cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 3 A three-dimensional structural schematic diagram of the first component of the battery pack provided as an example of this application; Figure 4 A cross-sectional view of the first component of a battery pack provided as an example of this application; Figure 5 A three-dimensional structural schematic diagram of the first component of the battery cell assembly provided as an example of this application from another perspective; Figure 6 A three-dimensional schematic diagram of a portion of the structure of a battery pack, as another example of this application; Figure 7 A three-dimensional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 8 A cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 9 A three-dimensional structural schematic diagram of the first heat-conducting component of a battery pack provided as an example of this application; Figure 10 for Figure 8 A magnified schematic diagram of a portion of the battery pack at point A; Figure 11 An inverted perspective view of a portion of the battery pack structure provided as an example of this application; Figure 12 A cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 13 for Figure 12 A magnified schematic diagram of the partial structure at point B of the middle battery pack; Figure 14 This is a three-dimensional schematic diagram of a portion of the structure of a battery pack provided as an example of this application.

[0027] Icons: 10-Battery pack; 100-Cell assembly; 110-Cell; 111-Cell housing; 112-Electrode terminal; 112a-Welding area; 200-Outer shell; 201-First opening; 210-Housing; 211-First sidewall; 212-Second sidewall; 213-Third sidewall; 214-Fourth sidewall; 215-Bottom wall; 220-Top cover; 300-First component; 301-Recess; 302-First through hole; 303-Second through hole; 304-Third through hole; 310 - Insulating element; 310a - Second opening; 311 - First groove; 312 - Protrusion; 320 - First heat-conducting element; 320a - Exposed area; 321 - Main body; 321a - Free end; 322 - Extension; 410 - Second heat-conducting element; 420 - Third heat-conducting element; 430 - Fourth heat-conducting element; 500 - Encapsulating resin; 600 - Adapter plate; 610 - Adapter; 700 - Circuit board; 710 - Connector; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0030] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0031] In one example, "connection" should be interpreted broadly, for example, it can be an abutment, a fixed connection, a detachable connection, etc.; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, the term "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same example, nor is it a separate or alternative example that is mutually exclusive with other examples.

[0033] In the examples of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different examples. It should be understood that the thickness, length, width, and other dimensions of the various components shown in the examples of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0034] With the development of the new energy industry, battery packs are gradually moving towards higher energy density and higher power density. However, when used under high-rate charging and discharging conditions, battery cells can overheat, especially at the electrode terminals, which generate significant heat and pose a risk of thermal runaway, potentially leading to serious safety issues such as smoke, fire, or explosion. Currently, the only way to alleviate this heat is to conduct some of the heat from the electrode terminals to the circuit board, but this method is not very effective.

[0035] To improve the heat dissipation capacity of a battery pack, this application provides a battery pack including a cell assembly, a casing, and a first component. The cell assembly includes multiple cells, each cell including a cell housing and electrode terminals. The cell assembly is located within the casing. The first component includes an insulating member and a first thermally conductive member fixed to the insulating member. The first thermally conductive member has an exposed area on its side facing the cell assembly, which is connected to at least one electrode terminal. And / or the electrode assembly includes a busbar connecting the electrode terminals, and the exposed area is connected to the busbar. The first thermally conductive member is connected to the casing; or, the casing has a first opening communicating with the outside of the battery pack, and a portion of the first thermally conductive member is exposed through the first opening.

[0036] In this type of battery pack, the exposed area is connected to at least one electrode terminal and / or busbar, the first thermal conductive element is connected to the outer casing, or the outer casing is provided with a first opening communicating with the outside of the battery pack, and part of the first thermal conductive element is exposed to the first opening. The heat of the electrode terminal is conducted to the first thermal conductive element through the exposed area, and then conducted to the outer casing through the first thermal conductive element or dissipated to the outside of the outer casing through the first opening, thereby improving the heat dissipation effect on the electrode terminal, reducing the risk of thermal runaway of the battery pack, and improving the safety of the battery pack.

[0037] The battery cells in the battery pack provided in this application example can be secondary or primary batteries, such as lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application example is not limited in this respect. The battery cells can be cylindrical, flat, cuboid, or other shapes, etc., and this application example is not limited in this respect either.

[0038] See Figure 1 , Figure 1 This is a schematic diagram of the exploded structure of a battery pack provided as an example of this application.

[0039] The battery pack 10 includes a cell assembly 100 and a housing 200. The cell assembly 100 includes a plurality of cells 110, and each cell 110 includes a cell housing 111 and electrode terminals 112. The cell assembly 100 is located within the housing 200.

[0040] In the battery pack 10, multiple cells 110 can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple cells 110 are connected in both series and parallel. Multiple cells 110 can be directly connected in series, parallel, or in a mixed manner to form a cell assembly 100; of course, multiple cells 200 can also be connected in series, parallel, or in a mixed manner to form a cell assembly 100.

[0041] The cell casing 111 can be in the form of a hard casing or a soft casing.

[0042] In one example, the housing 200 includes a housing 210 and a top cover 220, the top cover 220 covering the housing 210, and the housing 210 and the top cover 220 being connected to form a receiving space.

[0043] In one example, the housing 210 includes a first sidewall 211 and a second sidewall 212 disposed opposite each other along a first direction X, a third sidewall 213 and a fourth sidewall 214 disposed opposite each other along a third direction Z. The third sidewall 213 connects the first sidewall 211 and the second sidewall 212. The fourth sidewall 214 connects the first sidewall 211 and the second sidewall 212. The first direction X is perpendicular to the third direction Z.

[0044] In one example, housing 210 includes a bottom wall 215 connecting a first side wall 211, a second side wall 212, a third side wall 213, and a fourth side wall 214. The bottom wall 215 and top cover 220 are disposed opposite each other along a second direction Y. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0045] See Figures 1 to 5 , Figure 2 A cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 3 A three-dimensional structural schematic diagram of the first component of the battery pack provided as an example of this application; Figure 4 A cross-sectional view of the first component of a battery pack provided as an example of this application; Figure 5 A three-dimensional structural schematic diagram of the first component of a battery cell assembly provided as an example of this application, from another perspective.

[0046] The battery pack 10 includes a first component 300, which includes an insulating member 310 and a first thermally conductive member 320 fixed to the insulating member 310. The first thermally conductive member 320 has an exposed area 320a on the side facing the cell assembly 100, which is connected to at least one electrode terminal 112. The first thermally conductive member 320 is connected to the housing 200.

[0047] The heat from the electrode terminal 112 is conducted to the first heat-conducting element 320 through the exposed area 320a, and then to the outer casing 200 through the first heat-conducting element 320. This allows the heat to dissipate to the outside of the outer casing 200, improving the heat dissipation effect on the electrode terminal 112, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0048] In one example, the battery cells 110 are arranged along a first direction X. Electrode terminals 112 extend from one end of the battery cell housing 111 along a second direction Y, wherein the first direction X is perpendicular to the second direction Y.

[0049] See Figure 1 In one example, some of the battery cells 110 are arranged along the first direction X to form a first battery cell group 110a, and other battery cells 110 are arranged along the first direction X to form a second battery cell group 110b. In other examples, multiple battery cells 110 can all be arranged along the first direction X to form a column. In other examples, multiple battery cells 110 can form two or more columns.

[0050] In one example, the cell assembly 100 includes a busbar 120 connecting electrode terminals 112, and an exposed area 320a connected to the busbar 120. Heat from the electrode terminals 112 is conducted through the busbar 120 and the exposed area 320a to a first heat-conducting element 320, and then through the first heat-conducting element 320 to the housing 200. This allows heat to dissipate outside the housing 200, improving heat dissipation from the electrode terminals 112, reducing the risk of thermal runaway in the battery pack 10, and ultimately enhancing the safety of the battery pack 10. In one example, the first heat-conducting element 320 is a metal element, such as aluminum, copper, iron, etc.

[0051] The first heat-conducting component 320 is a metal component, which makes the thermal conductivity of the first heat-conducting component 320 high. It can quickly conduct the heat of the welding area 112a to the outer shell 200, further improve the heat dissipation effect of the electrode terminal 112, further reduce the risk of thermal runaway of the battery pack 10, and help to further improve the safety of the battery pack 10.

[0052] In one example, the housing 200 is a metal part, such as aluminum, copper, iron, etc.

[0053] The outer casing 200 is made of metal, resulting in a high thermal conductivity. This allows it to quickly absorb heat from the first heat-conducting element 320 and rapidly dissipate it to the outside, further improving heat dissipation to the electrode terminals 112 and reducing the risk of thermal runaway in the battery pack 10, thus enhancing its safety. Furthermore, the outer casing 200 has high load-bearing capacity, reducing the risk of deformation or damage due to stress or environmental changes, thus increasing the reliability of the battery pack 10.

[0054] In another example, the outer shell 200 can also be a high-strength non-metallic material such as carbon fiber or rigid plastic.

[0055] See Figure 6 , Figure 6 A three-dimensional schematic diagram of a portion of the structure of a battery pack, as another example of this application.

[0056] In another example, the housing 200 is provided with a first opening 201, which communicates with the outside of the battery pack 10. A portion of the first heat-conducting element 320 is exposed through the first opening 201. The heat from the first heat-conducting element 320 is directly dissipated to the outside of the housing 200 through the first opening 201, resulting in better heat dissipation of the electrode terminals 112 by the first heat-conducting element 320, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0057] See Figures 1 to 5 , Figure 7 , Figure 7 This is a three-dimensional schematic diagram of a portion of the structure of a battery pack provided as an example of this application.

[0058] In one example, the electrode terminals 112 of two adjacent cells 110 are connected to form a welding region 112a. An exposed region 320a is located above and connected to at least one welding region 112a. The shorter heat conduction path between the welding region 112a and the exposed region 320a increases the speed at which heat is conducted from the welding region 112a to the exposed region 320a, improving the heat dissipation efficiency of the battery pack 10, reducing the risk of thermal runaway, and ultimately enhancing the safety of the battery pack 10.

[0059] See Figure 7 In one example, cell 110 is a pouch cell. The electrode terminals 112 of two adjacent cells 110 can be stacked and welded to form a welding area 112a.

[0060] In another example, the electrode terminals 112 of two adjacent cells 110 can be connected by another conductive element (not shown). The electrode terminals 112 of the two adjacent cells 110 are soldered to the conductive element, forming a soldering area 112a. For example, if the cell 110 is a prismatic rigid cell, the electrode terminals 112 of two adjacent cells 110 are soldered to the conductive element respectively, forming two soldering areas 112a.

[0061] In one example, there are multiple welded areas 112a, and the exposed area 320a can be connected to a portion of the multiple welded areas 112a. In another example, the exposed area 320a can also be connected to each welded area 112a.

[0062] See Figure 7 In one example, the exposed area 320a is located above and connected to the busbar 120. The heat conduction path between the busbar 120 and the exposed area 320a is short, which increases the speed at which heat is conducted from the busbar 120 to the exposed area 320a, improves the heat dissipation efficiency of the battery pack 10, reduces the risk of thermal runaway of the battery pack 10, and helps to improve the safety of the battery pack 10.

[0063] In one example, electrode terminal 112 is welded to bus 120, and exposed area 320a is located above the welded area between bus 120 and electrode terminal 112 and connected to bus 120.

[0064] The shorter heat conduction path between the electrode terminal 112 and the exposed area 320a increases the speed at which heat is conducted from the electrode terminal 112 to the exposed area 320a, thereby improving the heat dissipation efficiency of the battery pack 10, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0065] See Figure 2 and Figure 7 In one example, the battery pack 10 includes a second heat-conducting element 410, which is disposed between the welded area 112a and the exposed area 320a, connecting the welded area 112a and the exposed area 320a. The second heat-conducting element 410 can quickly conduct heat from the welded area 112a to the exposed area 320a, which helps improve the heat dissipation efficiency of the battery pack 10, reduces the risk of thermal runaway of the battery pack 10, and helps improve the safety of the battery pack 10.

[0066] Optionally, the second heat-conducting element 410 is in contact with the welding area 112a. Optionally, the second heat-conducting element 410 is in contact with the exposed area 320a. This is beneficial for improving the heat dissipation efficiency of the battery pack 10, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0067] In one example, a second heat-conducting element 410 is disposed between the busbar 120 and the exposed area 320a, connecting the busbar 120 and the exposed area 320a. The second heat-conducting element 410 can quickly conduct heat from the busbar 120 to the exposed area 320a, which helps improve the heat dissipation efficiency of the battery pack 10, reduces the risk of thermal runaway of the battery pack 10, and improves the safety of the battery pack 10.

[0068] Optionally, the second heat-conducting element 410 and the busbar 120 are in contact connection. Optionally, the second heat-conducting element 410 and the exposed area 320a are in contact connection. This helps to improve the heat dissipation efficiency of the battery pack 10, reduce the risk of thermal runaway of the battery pack 10, and improve the safety of the battery pack 10.

[0069] In one example, the thermal conductivity of the second heat-conducting element 410 is greater than or equal to 1 W / (m·K). For example, the thermal conductivity of the second heat-conducting element 410 can be 1 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.5 W / (m·K), 2 W / (m·K), 3 W / (m·K), 5 W / (m·K), 8 W / (m·K), 10 W / (m·K), 12 W / (m·K), 15 W / (m·K), or 20 W / (m·K), etc.

[0070] The thermal conductivity of the second heat-conducting element 410 is the thermal conductivity of the second heat-conducting element 410 at 25℃.

[0071] In one example, the thermal conductivity of the second heat-conducting element 410 is 1 W / (m·K) to 6 W / (m·K). For example, the thermal conductivity of the second heat-conducting element 410 can be 1 W / (m·K), 1.1 W / (m·K), 1.5 W / (m·K), 2 W / (m·K), 2.5 W / (m·K), 3 W / (m·K), 3.5 W / (m·K), 4 W / (m·K), 4.5 W / (m·K), 5 W / (m·K), 5.5 W / (m·K), or 6 W / (m·K), etc.

[0072] Optionally, the second thermal conductive element 410 includes a thermal pad.

[0073] See Figure 4 and Figure 5 In one example, the insulating member 310 has a second opening 310a, and the exposed area 320a closes the second opening 310a and is connected to the insulating member 310 to form a first groove 311. At least a portion of the second heat-conducting member 410 is disposed in the first groove 311. The first groove 311 is located on the side of the insulating member 310 facing the cell assembly 100.

[0074] By placing at least a portion of the second heat-conducting element 410 within the first groove 311, the first groove 311 serves to limit the second heat-conducting element 410, reducing the risk of the second heat-conducting element 410 detaching from the exposed area 320a and improving the heat dissipation reliability of the battery pack 10.

[0075] See Figure 1 , Figure 5 and Figure 8 , Figure 8 This is a cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application. Figure 8 The dashed line indicates the height of the potting resin.

[0076] In one example, the battery pack 10 includes a potting resin 500 located between the cell assembly 100 and the first member 300, and the potting resin 500 encapsulates a portion of the welding area 112a and the second thermal conductive member 410.

[0077] By positioning the potting resin 500 between the cell assembly 100 and the first component 300, the sealing and insulation protection of the electrode terminal 112 is improved, reducing the risk of short circuits caused by contact between the electrode terminal 112 and other components.

[0078] In one example, a portion of the second heat conductor 410 is located within the first groove 311, and the potting resin 500 encapsulates the welding area 112a and the portion of the second heat conductor 410 located outside the first groove 311.

[0079] In one example, the potting resin 500 may include, but is not limited to, polyurethane adhesive, epoxy adhesive, and silicone resin.

[0080] See Figure 5 In one example, the first component 300 has a recess 301 facing the cell assembly 100, and the potting resin 500 and the soldering area 112a are located within the recess 301. The potting resin 500 bonds the soldering area 112a to the first component 300. By making the first component 300 have a recess 301, it is convenient to provide the potting resin 500 within the recess 301.

[0081] In one example, the thermal conductivity of the potting resin 500 is less than that of the first thermal conductive element 320, and the thermal conductivity of the potting resin 500 is less than that of the second thermal conductive element 410.

[0082] The heat from the electrode terminal 112 is mainly transferred to the housing 200 through the second heat-conducting element 410 and the first heat-conducting element 320, or dissipated to the outside of the housing 200 through the first opening 201.

[0083] In one example, the thermal conductivity of the potting resin 500 is 0.1 W / (m·K) to 0.3 W / (m·K). For example, the thermal conductivity of the potting resin 500 can be 0.1 W / (m·K), 0.12 W / (m·K), 0.15 W / (m·K), 0.18 W / (m·K), 0.2 W / (m·K), 0.22 W / (m·K), 0.25 W / (m·K), 0.27 W / (m·K), or 0.3 W / (m·K), etc.

[0084] The thermal conductivity of potting resin 500 is the thermal conductivity of potting resin 500 at 25℃.

[0085] The potting resin 500 has a low thermal conductivity, and the electrode terminal 112 mainly dissipates heat through the second thermal conductive element 410 and the first thermal conductive element 320.

[0086] See Figure 7 In one example, the battery pack 10 includes an adapter plate 600, with electrode terminals 112 electrically connected to the adapter plate 600 via an adapter 610. A portion of the second heat-conducting element 410 is connected to the welding area 112a, and another portion is connected to the adapter 610. Optionally, the adapter plate 600 includes a flexible printed circuit board (FPC). Optionally, the adapter plate 600 includes a printed circuit board (PCB).

[0087] Optionally, the adapter 610 is configured to acquire electrical signals from the electrode terminal 112, including but not limited to voltage and current.

[0088] See Figure 9 , Figure 9 This is a three-dimensional structural schematic diagram of the first heat-conducting element of a battery pack provided as an example of this application.

[0089] In one example, the first heat-conducting element 320 includes a main body 321 and at least one extension 322 connected to the main body 321 along a second direction Y. The main body 321 is located above the cell assembly 100. The extension 322 is located on one side of the cell assembly 100 along the first direction X, and / or, the extension 322 is located on one side of the cell assembly 100 along a third direction Z. The extension 322 is exposed outside the insulating element 310 and is connected to the housing 200. The first direction X is perpendicular to the second direction Y, and the second direction Y is perpendicular to the third direction Z.

[0090] By providing an extension 322, the extension 322 is exposed outside the insulating member 310 and connected to the outer shell 200. The connection area between the first heat-conducting member 320 and the outer shell 200 is large, and the heat conduction area between the first heat-conducting member 320 and the outer shell 200 is large, which is beneficial to improving the heat dissipation efficiency of the battery pack 10, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0091] In one example, the extension 322 is exposed outside the first opening 201. Alternatively, a portion of the extension 322 may be exposed outside the first opening 201, or the entire extension 322 may be exposed outside the first opening 201.

[0092] See Figure 8 In one example, there are four extensions 322. Two extensions 322 are located on one side of the cell assembly 100 along the first direction X. One extension 322 is connected to the first sidewall 211. The other extension 322 is connected to the second sidewall 212. The other two extensions 322 are located on one side of the cell assembly 100 along the third direction Z. One extension 322 is connected to the third sidewall 213. The other extension 322 is connected to the fourth sidewall 214.

[0093] In another example, the extension 322 can be a single extension located on one side of the cell assembly 100 along the first direction X. The extension 322 is connected to the first sidewall 211, or the extension 322 is connected to the second sidewall 212.

[0094] In another example, the extension 322 can be a single extension located on one side of the cell assembly 100 along the third direction Z. The extension 322 is connected to the third sidewall 213, or the extension 322 is connected to the fourth sidewall 214.

[0095] In another example, there may be at least two extensions 322, one of which is located on one side of the cell assembly 100 along the first direction X. The extension 322 is connected to the first sidewall 211, or the extension 322 is connected to the second sidewall 212. Another extension 322 is located on one side of the cell assembly 100 along the third direction Z. The extension 322 is connected to the third sidewall 213, or the extension 322 is connected to the fourth sidewall 214.

[0096] In another example, at least one of the first sidewall 211, second sidewall 212, third sidewall 213, and fourth sidewall 214 may be provided with a first opening 201, through which the extension 322 is exposed. For example, there may be at least two extensions 322, one of which is located on one side of the cell assembly 100 along a first direction X. The first sidewall 211 is provided with a first opening 201, through which the extension 322 is exposed. One of the extensions 322 is located on one side of the cell assembly 100 along a third direction Z. The extension 322 is connected to the third sidewall 213, or the extension 322 is connected to the fourth sidewall 214.

[0097] See Figure 10 and Figure 11 , Figure 10 for Figure 8 A magnified schematic diagram of a portion of the battery pack at point A; Figure 11 This is an inverted perspective view of a portion of the battery pack structure provided as an example of this application.

[0098] In one example, the battery pack 10 includes a third thermal conductive element 420 disposed between the extension 322 and the housing 200, the third thermal conductive element 420 connecting the extension 322 and the housing 200.

[0099] The third heat-conducting component 420 can quickly conduct the heat from the extension 322 to the outer casing 200, which helps to improve the heat dissipation efficiency of the battery pack 10, reduce the risk of thermal runaway of the battery pack 10, and improve the safety of the battery pack 10.

[0100] In one example, the thermal conductivity of the third heat-conducting element 420 is greater than or equal to 1 W / (m·K). For example, the thermal conductivity of the third heat-conducting element 420 can be 1 W / (m·K), 1.1 W / (m·K), 1.2 W / (m·K), 1.5 W / (m·K), 2 W / (m·K), 3 W / (m·K), 5 W / (m·K), 8 W / (m·K), 10 W / (m·K), 12 W / (m·K), 15 W / (m·K), or 20 W / (m·K), etc.

[0101] The thermal conductivity of the third heat-conducting element 420 is the thermal conductivity of the third heat-conducting element 420 at 25℃.

[0102] In one example, the thermal conductivity of the third heat conductor 420 is 1 W / (m·K) to 6 W / (m·K). For example, the thermal conductivity of the third heat conductor 420 can be 1 W / (m·K), 1.1 W / (m·K), 1.5 W / (m·K), 2 W / (m·K), 2.5 W / (m·K), 3 W / (m·K), 3.5 W / (m·K), 4 W / (m·K), 4.5 W / (m·K), 5 W / (m·K), 5.5 W / (m·K), or 6 W / (m·K), etc.

[0103] Optionally, the third thermal conductive element 420 includes a thermal pad.

[0104] See Figure 3 , Figure 4 , Figure 12 and Figure 13 , Figure 12 A cross-sectional schematic diagram of a portion of the structure of a battery pack provided as an example of this application; Figure 13 for Figure 12 A magnified schematic diagram of the partial structure at point B of the middle battery pack.

[0105] In one example, the side of the first thermally conductive element 320 facing away from the cell assembly 100 is at least partially exposed to the insulating element 310. The insulating element 310 and the first thermally conductive element 320 are integrally injection molded, and the insulating element 310 covers the free end 321a of the main body portion 321. Herein, the free end 321a refers to the end that is not connected to the extension portion 322.

[0106] By exposing at least part of the side of the first heat-conducting element 320 facing away from the cell assembly 100 to the insulating element 310, the heat conducted from the welding area 112a to the first heat-conducting element 320 can be directly dissipated into the cavity of the outer casing 200 through the side of the first heat-conducting element 320 facing away from the cell assembly 100, thereby further improving the heat dissipation efficiency of the battery pack 10, reducing the risk of thermal runaway of the battery pack 10, and improving the safety of the battery pack 10.

[0107] The insulating member 310 covering the free end 321a of the main body 321 means that the insulating member 310 covers three sides of the free end 321a of the main body 321. For example, see Figure 13 For the free end 321a of the main body 321 along the third direction Z, the upper and lower surfaces of the free end 321a along the first direction X and the end face along the third direction Z are covered by the insulating member 310.

[0108] The first heat-conducting element 320 has at least a partial exposure on the side facing away from the cell assembly 100 to the insulating element 310. The first heat-conducting element 320 has a free end 321a and is affected by the heat generated by the electrode terminal 112. The insulating element 310 and the first heat-conducting element 320 shrink at different rates when heated, which may cause gaps to form between the insulating element 310 and the first heat-conducting element 320, affecting the sealing performance between the insulating element 310 and the first heat-conducting element 320 and increasing the risk of external moisture seeping into the battery pack 10 through the free end 321a. By having the insulating element 310 wrap around the free end 321a of the main body 321, the sealing performance between the insulating element 310 and the free end 321a of the first heat-conducting element 320 is improved, reducing the risk of moisture seeping into the battery pack 10 through the free end 321a.

[0109] In one example, the second thermal conductive element 410 includes a silicone thermal pad. By including a silicone thermal pad in the second thermal conductive element 410, the thermal conductivity of the second thermal conductive element 410 is improved, and the thermal conductivity efficiency is higher.

[0110] When heated, the silicone thermal pad may release silicone oil, potentially damaging the interface between the insulating component 310 and the first thermally conductive component 320. By wrapping the free end 321a of the main body 321 with the insulating component 310, the impact of silicone oil release on the interface between the insulating component 310 and the first thermally conductive component 320 is reduced. This improves the seal between the insulating component 310 and the free end 321a of the first thermally conductive component 320, enhancing the sealing and protection of the electrode terminal 112 by the first component 300 and reducing the risk of short circuits caused by contact between the electrode terminal 112 and other components.

[0111] See Figure 1 and Figure 14 , Figure 14 This is a three-dimensional schematic diagram of a portion of the structure of a battery pack provided as an example of this application.

[0112] In one example, the battery pack 10 includes a circuit board 700 and a conductive element (not shown). A connector 710 is provided on the circuit board 700, and the conductive element connects to the battery cell assembly 100. The conductive element passes through a first member 300 and is connected to the circuit board 700 and / or the connector 710. The first member 300 serves to fix the conductive element, thereby improving the connection stability of the conductive element.

[0113] In one example, circuit board 700 is fixed to top cover 220.

[0114] Optionally, circuit board 700 includes a printed circuit board (PCB). Optionally, circuit board 700 includes a flexible printed circuit (FPC).

[0115] In one example, the conductive components include a main positive conductive component and a main negative conductive component, which can transmit power to the battery pack 10. When the battery pack 10 is discharging, the electrical energy of the battery pack 10 can be transmitted to the load of the electrical device through the main positive conductive component and the main negative conductive component to power the load of the electrical device. When the battery pack 10 is charging, external electrical energy can be transmitted to the battery pack 10 through the main positive conductive component and the main negative conductive component to charge the battery pack 10.

[0116] In one example, the conductive element includes a sampling harness that can transmit electrical signals of the battery pack 10, such as voltage signals, current signals, temperature signals, etc. The electrical signals of the battery pack 10 can be transmitted to a circuit board 700 via the sampling harness, and a control unit (e.g., a microcontroller) on the circuit board 700 can control the charging and / or discharging of the battery pack 10 based on the electrical signals of the battery pack 10.

[0117] See Figure 2 and Figure 3 The first component 300 is provided with a first through hole 302, a second through hole 303 and a third through hole 304. The main positive conductive component passes through the first through hole 302, the main negative conductive component passes through the second through hole 303, and the sampling wire harness passes through the third through hole 304.

[0118] In one example, a sealant (not shown in the figure) is first used to seal the gaps between the conductive element and each through hole. Then, the battery pack 10 is inverted, and resin material is poured between the first component 300 and the cell assembly 100 to form a potting resin 500.

[0119] In another example, the conductive element can also be integrally injection molded with the first component 300.

[0120] This application provides an example of an electrical device that includes a battery pack 10 provided in any of the above examples. The electrical device includes, but is not limited to, agricultural drones.

[0121] It should be noted that, where there is no conflict, the examples and features in these examples can be combined with each other.

[0122] The above are merely preferred examples of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: A battery cell assembly includes multiple battery cells, each battery cell including a cell housing and electrode terminals; The housing, within which the battery cell assembly is located; A first component includes an insulating element and a first thermally conductive element fixed to the insulating element. The first thermally conductive element has an exposed area on the side facing the cell assembly that is exposed to the insulating element. The exposed area is connected to at least one of the electrode terminals. And / or the cell assembly includes a busbar connected to the electrode terminals, and the exposed area is connected to the busbar. The first heat-conducting component is connected to the outer casing; or, the outer casing is provided with a first opening communicating with the outside of the battery pack, and a portion of the first heat-conducting component is exposed through the first opening.

2. The battery pack according to claim 1, characterized in that, The electrode terminals of two adjacent battery cells are connected to form a welding area; the exposed area is located above and connected to at least one of the welding areas. And / or, the exposed area is located above the busbar and connected to the busbar.

3. The battery pack according to claim 2, characterized in that, The battery pack includes a second thermal conductive element, which is disposed between the welding area and the exposed area, and the second thermal conductive element connects the welding area and the exposed area; And / or, the second heat-conducting element is disposed between the busbar and the exposed area, and the second heat-conducting element connects the busbar and the exposed area.

4. The battery pack according to claim 3, characterized in that, The thermal conductivity of the second heat-conducting component is greater than or equal to 1 W / (m·K).

5. The battery pack according to claim 3 or 4, characterized in that, The insulating component has a second opening, the exposed area closes the second opening and is connected to the insulating component to form a first groove, and at least a portion of the second heat-conducting component is disposed in the first groove.

6. The battery pack according to any one of claims 3-5, characterized in that, The battery pack includes a potting resin located between the cell assembly and the first component, the potting resin encapsulating the welding area and a portion of the second thermal conductive element.

7. The battery pack according to claim 6, characterized in that, The first component has a recess facing the cell assembly, the potting resin and the welding area are located within the recess, and the potting resin bonds the welding area and the first component.

8. The battery pack according to claim 6 or 7, characterized in that, The thermal conductivity of the potting resin is less than that of the first thermally conductive element, and the thermal conductivity of the potting resin is less than that of the second thermally conductive element.

9. The battery pack according to any one of claims 3-8, characterized in that, The side of the first thermally conductive element facing away from the cell assembly is at least partially exposed to the insulating element; The insulating component and the first heat-conducting component are integrally injection molded, and the insulating component covers the free end of the main body.

10. The battery pack according to claim 9, characterized in that, The second thermal conductive element includes a silicone thermal pad.

11. The battery pack according to any one of claims 1-10, characterized in that, The first heat-conducting component includes a main body and at least one extension, the extension being connected to the main body along the second direction, the main body being located above the cell assembly, the extension being located on one side of the cell assembly along the first direction, and / or, the extension being located on one side of the cell assembly along the third direction, the first direction being perpendicular to the second direction, and the second direction being perpendicular to the third direction; The extension is exposed outside the insulating member, the extension is connected to the housing, or at least a portion of the extension is exposed outside the first opening.

12. The battery pack according to claim 11, characterized in that, The battery pack includes a third thermal conductive element disposed between the extension and the outer casing, the third thermal conductive element connecting the extension and the outer casing.

13. The battery pack according to claim 12, characterized in that, The thermal conductivity of the third heat-conducting component is greater than or equal to 1 (W / (m·K).

14. The battery pack according to any one of claims 1-13, characterized in that, The battery pack includes a circuit board and conductive components. A connector is provided on the circuit board, and the conductive components connect to the battery cell assembly. The conductive components pass through the first component and are connected to the circuit board and / or the connector.

15. An electrical appliance, characterized in that, It includes at least one battery pack as described in any one of claims 1-14.

Images