Battery pack and electric device

Abstract

This application provides a battery pack and an electrical device. The battery pack includes multiple battery cell units stacked along a first direction. Each battery cell unit includes a support and a battery cell. The support has a first support portion. The battery cell is housed within the support. The first support portion is configured to support adjacent supports along the first direction, creating a gap between adjacent supports. Because the battery cell is housed within the support, the heat generated during charging and discharging can be transferred through the support to the gap between adjacent supports. This results in a large heat dissipation area, a short heat transfer path, and low thermal resistance, allowing the heat generated by the battery cell to be quickly transferred away through this gap, thereby rapidly reducing the cell temperature and improving the battery pack's heat dissipation capacity, thus contributing to the battery pack's safety performance.

Description

Technical Field

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

[0002] When battery packs are used under conditions of high rate, no rest, and continuous charge and discharge (such as battery packs for agricultural drones), the cell temperature may become too high. In order to ensure charge and discharge, the cell temperature needs to be reduced rapidly, but existing battery pack solutions cannot fully meet the need for rapid cell cooling. Summary of the Invention

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

[0004] In a first aspect, embodiments of this application provide a battery pack, the battery pack including a plurality of battery cell units, the plurality of battery cell units being stacked along a first direction, each battery cell unit including a bracket and a battery cell, the bracket being provided with a first support portion; the battery cell being housed within the bracket; wherein, the first support portion is configured to support adjacent brackets along the first direction, so that a gap is formed between two adjacent brackets.

[0005] In the above technical solution, the first support part of the bracket supports an adjacent bracket, forming a gap between the two adjacent brackets. The battery cell is housed within the bracket, allowing the heat generated by the battery cell during charging and discharging to be transferred through the bracket to the gap between the two adjacent brackets. This results in a large heat dissipation area, a short heat transfer path, and low thermal resistance, enabling the heat generated by the battery cell to be quickly transferred away through this gap, thereby rapidly reducing the battery cell temperature and improving the heat dissipation capacity of the battery pack, thus contributing to the safety performance of the battery pack. Furthermore, the bracket not only accommodates and protects the battery cell but also facilitates heat dissipation, has a simple structure, and occupies little space.

[0006] In some embodiments of the first aspect of this application, the bracket is further provided with a second support portion. Along the first direction, the second support portion and the first support portion are respectively disposed on both sides of the bracket, and the second support portion is configured to cooperate with the first support portion of an adjacent bracket.

[0007] In the above technical solution, after two battery cells are stacked along the first direction, the second support part of one bracket of two adjacent battery cells and the first support part of another bracket of two adjacent battery cells are positioned and matched, which can improve the positioning accuracy and stacking stability of the two adjacent battery cells, thereby improving the stability of the entire battery pack structure.

[0008] In some embodiments of the first aspect of this application, the bracket is provided with a plurality of first support portions, which are spaced apart.

[0009] In the above technical solution, the multiple first support parts of the bracket are distributed at intervals and jointly support adjacent brackets, which can improve support stability and thus form a stable gap between two adjacent brackets, which is conducive to stable and rapid heat dissipation of the battery cell. The multiple first support parts jointly supporting adjacent brackets can also improve the stacking stability of two adjacent battery cell units.

[0010] In some embodiments of the first aspect of this application, a plurality of first support portions are arranged in a rectangular array on the bracket.

[0011] In the above technical solution, a rectangular array of multiple first support parts is distributed on the bracket, which not only improves the stacking stability of two adjacent battery cell units, but also facilitates uniform heat dissipation of the battery cells.

[0012] In some embodiments of the first aspect of this application, the battery cell further includes a heat-conducting element disposed on the inner surface of the bracket.

[0013] In the above technical solution, the heat-conducting component is set on the inner surface of the bracket, which enables the heat generated by the battery cell to be quickly transferred to the bracket and quickly transferred out from the gap between adjacent brackets, thereby improving the heat dissipation efficiency of the battery cell.

[0014] In some embodiments of the first aspect of this application, the bracket includes a first portion and a second portion, the first portion and the second portion being arranged along the first direction, the first portion and the second portion jointly defining an accommodating space, and the battery cell being housed within the accommodating space.

[0015] In the above technical solution, the bracket is assembled into a space for accommodating the battery cell after the first part and the second part are assembled, which facilitates the entry of the battery cell into the bracket and makes it easy to maintain different parts of the bracket.

[0016] In some embodiments of the first aspect of this application, the first part is provided with a first fixing part, and the second part is provided with a second fixing part, the first fixing part and the second fixing part being fixedly engaged along the first direction; along the first direction, the first fixing part and the first supporting part are respectively provided on both sides of the first part, and the second fixing part and the second supporting part are respectively provided on both sides of the second part.

[0017] In the above technical solution, during the assembly of the first part and the second part to form a bracket, the first fixing part of the first part and the second fixing part of the second part cooperate, which helps to improve the accurate positioning of the first fixing part and the second fixing part during the assembly process, facilitates the bracket assembly and forming, and enables the first part and the second part to maintain a relatively stable cooperation relationship, thereby making the bracket structure stable. The first fixing part and the first support part are respectively arranged on both sides of the first part, and the second fixing part and the second support part are respectively arranged on both sides of the second part, which is convenient for manufacturing and enables the second support part and the first support part to cooperate without interference, and the first fixing part and the second fixing part of the adjacent bracket to cooperate without interference.

[0018] In some embodiments of the first aspect of this application, the battery cell unit forms a power output portion at at least one end along a second direction, and a first channel is formed between the first portion and the second portion for the power output portion to pass through, the second direction being perpendicular to the first direction; the battery pack further includes a first seal, the first seal being configured to close the first channel.

[0019] In the above technical solution, the power output section of the battery cell extends from the first channel, facilitating electrical connection between the power output section and other structures to output the battery cell's power. The first seal seals the first channel, reducing the risk of battery cell leakage and external impurities entering the battery cell.

[0020] In some embodiments of the first aspect of this application, the power output section includes a main body and a bend portion disposed along a third direction in the main body; the first channel includes a first space and a receiving chamber disposed along the third direction in the first space, the receiving chamber being connected to the first space, the main body being received in the first space, and the bend portion being received in the receiving chamber; the first direction, the second direction, and the third direction are perpendicular to each other.

[0021] In the above technical solution, the power output part has bends at both ends of its main body in the third direction, which can reduce the size of the power output part in the third direction. The bends are accommodated in the accommodating chamber, and the main body is accommodated in the first space, so that the size of the accommodating chamber matches the size of the corresponding bend and the size of the first space matches the size of the first space, which facilitates the power output part to extend out of the first channel of the bracket and reduces the difficulty of sealing the first channel.

[0022] In some embodiments of the first aspect of this application, the first part includes a first straight portion and a first bent portion, and the second part includes a second straight portion and a second bent portion. Along the third direction, the second bent portion is connected to the second straight portion. The first straight portion and the second straight portion are arranged opposite to each other along the first direction to form the first space, and the first bent portion and the second bent portion form the receiving chamber.

[0023] In the above technical solution, the first space is formed by the first straight part of the first part and the second straight part of the second part, and each accommodating chamber is formed by the first bend of the first part and the second bend of the second part, so as to facilitate the power output part to enter the first channel and extend out from the first channel.

[0024] In some embodiments of the first aspect of this application, the first straight portion is provided with a first limiting groove extending along the third direction, and a portion of the first sealing member is accommodated in the first limiting groove; and / or, the second straight portion is provided with a second limiting groove extending along the third direction, and a portion of the first sealing member is accommodated in the second limiting groove.

[0025] In the above technical solution, a portion of the first sealing element is accommodated in the first limiting groove, which can limit the first sealing element so that the portion of the first sealing element can provide a stable sealing effect on the first space; and / or a portion of the first sealing element is accommodated in the second limiting groove, which can limit the first sealing element so that the portion of the first sealing element can provide a stable sealing effect on the first space.

[0026] In some embodiments of the first aspect of this application, the first sealing member includes a first sealing portion, a second sealing portion, a third sealing portion and a fourth sealing portion. The first sealing portion and the second sealing portion seal the first space and are respectively located on both sides of the main body portion along the first direction. The third sealing portion is located in one of the receiving chambers and covers the corner portion. The fourth sealing portion is located in another of the receiving chambers and covers the corner portion.

[0027] In the above technical solution, the first sealing part and the second sealing part are both sealed in the first space and are located on both sides of the main body along the first direction, which can improve the sealing performance of the first space. The third sealing part and the fourth sealing part are respectively housed in two receiving chambers and cover the corresponding corner parts, which can improve the sealing performance between the corner parts and the bracket.

[0028] In some embodiments of the first aspect of this application, the third sealing portion and the fourth sealing portion are respectively filled into the two receiving chambers.

[0029] In the above technical solution, the third and fourth sealing parts formed by potting can enhance the overall performance of the third sealing part, the corner part, and the bracket, as well as the fourth sealing part, the corner part, and the bracket, thereby improving resistance to external impacts and vibrations, and enhancing waterproof and moisture-proof performance. Furthermore, the potting process makes it easier for the third and fourth sealing parts to cover the corresponding corner parts.

[0030] In some embodiments of the first aspect of this application, two adjacent battery cells are provided with two sealing structures. Along the second direction, the two sealing structures are respectively disposed at both ends of the bracket to seal the gap at both ends along the second direction.

[0031] In the above technical solution, the two sealing structures respectively seal the two ends of the gap along the second direction, reducing the risk that other impurities will enter the gap along the two ends of the gap in the second direction and block or occupy part of the gap, thereby ensuring the heat dissipation area of ​​the gap.

[0032] In some embodiments of the first aspect of this application, the sealing structure includes a fifth sealing portion and a sixth sealing portion, wherein the fifth sealing portion and the sixth sealing portion are respectively disposed on two adjacent brackets along the first direction, and the fifth sealing portion and the sixth sealing portion are sealed together.

[0033] In the above technical solution, the fifth and sixth sealing parts provided on the two adjacent brackets can seal and cooperate after the two brackets are stacked to block the two ends of the gap along the second direction, reducing the risk that other impurities will enter the gap along the two ends of the gap in the second direction and block or occupy part of the gap, thereby ensuring the heat dissipation area of ​​the gap.

[0034] In some embodiments of the first aspect of this application, the fifth sealing part forms a sealing groove, and the sixth sealing part is inserted into the sealing groove; the sealing structure further includes a second sealing member, which is located in the sealing groove and seals the gap between the sixth sealing part and the sealing groove.

[0035] In the above technical solution, the sixth sealing part is inserted into the sealing groove formed on the fifth sealing part. This not only seals the gap between two adjacent supports, reducing the risk of other impurities entering the gap along the two ends in the second direction, but also positions the gap between the two adjacent supports, improving the stacking stability of the two adjacent supports. The second sealing element seals the gap between the sixth sealing part and the sealing groove, further improving the sealing performance between the two adjacent supports.

[0036] In some embodiments of the first aspect of this application, the battery cell has power output sections formed at both ends along the second direction.

[0037] In the above technical solution, power output sections are formed at both ends of the battery cell along the second direction. The polarities of the power output sections at both ends are opposite, which reduces the risk of contact between the two power output sections with opposite polarities, thereby reducing the risk of short circuit in the battery pack.

[0038] In some embodiments of the first aspect of this application, the power output portion is formed at both ends of the cell unit along the second direction; the battery pack further includes two sidewalls, which are respectively located on both sides of the cell unit along the second direction, and each bracket is connected to the two sidewalls; a receiving cavity is formed on the side of the sidewall facing the cell unit, and each power output portion is received in the receiving cavity; the battery pack further includes a third sealing member, which is filled in the receiving cavity.

[0039] In the above technical solution, the two sidewalls are located on both sides of the cell unit along the second direction, which can protect the cell unit on both sides of the second direction. Each bracket is connected to the two sidewalls, which can maintain a relatively stable stacking relationship of multiple cell units, thereby enabling the battery pack to form a stable overall structure. The third seal fills the receiving cavity on the sidewall facing the cell unit to improve the sealing performance between the sidewall and the cell unit, reduce the risk of other impurities entering the receiving cavity and then entering the gap from both ends of the gap in the second direction, and reduce the risk of other impurities contaminating or damaging the power output section.

[0040] In some embodiments of the first aspect of this application, the battery cell includes a housing, an electrode assembly, and electrode terminals connected to the electrode assembly and extending from the housing; wherein the housing includes a body portion and an extension portion extending outward from the body portion, the electrode assembly is housed within the body portion, and the electrode terminals extend from the extension portion.

[0041] In the above technical solution, the electrode assembly is housed within the main body of the housing, and the electrode terminals extend from the extension portion of the housing, making the internal structure of the housing more compatible with the electrode assembly and electrode terminals, which facilitates subsequent sealing of the housing and electrode terminals.

[0042] In some embodiments of the first aspect of this application, the battery cell further includes an insulating member sleeved on the outer periphery of the body portion.

[0043] In the above technical solution, the insulating component is sleeved on the outer periphery of the main body, which can insulate and separate the battery cell and the bracket, reducing the risk of short circuit in the battery pack.

[0044] In some embodiments of the first aspect of this application, the battery pack further includes a circuit board, the power output section is electrically connected to the circuit board, and along the second direction, a fourth seal is filled between each of the two ends of the circuit board and the two sidewalls.

[0045] In the above technical solution, a fourth sealing element is filled between the two ends of the circuit board in the second direction and the side wall, which can protect the connection position between the power output part and the circuit board and reduce the risk of other impurities entering the space between the side wall and the circuit board, causing the electrical connection between the power output part and the circuit board to fail.

[0046] In some embodiments of the first aspect of this application, the battery pack further includes a top wall that covers the side of the circuit board opposite to the cell unit and is connected to the two side walls.

[0047] In the above technical solution, the top wall cover is located on the side of the circuit board away from the battery cell unit, which can protect the circuit board and reduce the risk of damage to the circuit board from external forces.

[0048] In some embodiments of the first aspect of this application, the battery cell is a pouch cell.

[0049] In the above technical solution, the casing of the pouch cell is relatively soft. If it is directly stacked along the first direction, the adjacent cells will be in close contact, resulting in poor heat dissipation performance. By accommodating the pouch cell in the bracket, and the support part of the bracket supporting the adjacent bracket, a gap can be formed between the two adjacent brackets. The heat generated by the pouch cell during charging and discharging can be transferred through the bracket to the gap between the two adjacent brackets. The heat dissipation area is large, the heat transfer path is short, and the thermal resistance is low. The heat generated by the pouch cell can be quickly transferred out through this gap, thereby rapidly reducing the temperature of the pouch cell and improving the heat dissipation capacity of the battery pack.

[0050] Secondly, embodiments of this application provide an electrical device, including the battery pack provided in any embodiment of the first aspect.

[0051] In the above technical solution, the battery pack provided by the first aspect embodiment has good heat dissipation capability and high heat dissipation efficiency, thereby making the battery pack have high safety performance and improving the electrical safety of electrical equipment. Attached Figure Description

[0052] 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. Other related drawings can be obtained based on these drawings.

[0053] Figure 1 Exploded views of multiple battery cell units provided in some embodiments of this application;

[0054] Figure 2 Cross-sectional views of a battery cell unit provided in some embodiments of this application;

[0055] Figure 3 This is a cross-sectional view of two adjacent battery cell units stacked together.

[0056] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0057] Figure 5 Cross-sectional view of two adjacent battery cells stacked together, provided for other embodiments of this application;

[0058] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0059] Figure 7 A cross-sectional view of two adjacent battery cells stacked together, provided for some embodiments of this application;

[0060] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0061] Figure 9 Structural cross-sectional views of the battery cell unit provided in other embodiments of this application;

[0062] Figure 10 for Figure 9 A schematic diagram of the stacked battery cells in the diagram;

[0063] Figure 11 for Figure 10 Enlarged view at point D;

[0064] Figure 12 A structural cross-sectional view of a battery cell unit provided in some embodiments of this application;

[0065] Figure 13 for Figure 12 A schematic diagram of the stacked battery cells;

[0066] Figure 14 for Figure 13 Enlarged view at point E in the middle;

[0067] Figure 15 A perspective view of a battery cell unit provided in some embodiments of this application;

[0068] Figure 16 Exploded views of battery cell units provided in some embodiments of this application;

[0069] Figure 17 This is a schematic diagram of the structure of the first part provided for some embodiments of this application;

[0070] Figure 18 This is a schematic diagram of the structure of the second part provided for some embodiments of this application;

[0071] Figure 19 Perspective view of a battery cell unit provided for other embodiments of this application;

[0072] Figure 20 for Figure 19 Enlarged view at point F;

[0073] Figure 21 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0074] Figure 22 This is a schematic diagram of the battery cell casing.

[0075] Figure 23 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0076] Figure 24 A schematic diagram of the structure of the first part provided for other embodiments of this application;

[0077] Figure 25 This is a schematic diagram of the structure of the second part provided for other embodiments of this application;

[0078] Figure 26 This is a schematic diagram showing the fit between the first seal and the first and second grooves in this application. Figure 2 (Enlarged view of point G in the middle);

[0079] Figure 27 for Figure 3 Enlarged view of section H in the middle;

[0080] Figure 28 This is a schematic diagram showing the sealed fit between the first part of one of two adjacent brackets and the second part of the other through a sealing structure.

[0081] Figure 29 This is a schematic diagram of the battery pack structure provided in some other embodiments of this application;

[0082] Figure 30 Schematic diagrams of the sidewall structure provided for some embodiments of this application;

[0083] Figure 31 Cross-sectional views of the battery pack provided in other embodiments of this application;

[0084] Figure 32 for Figure 31 Enlarged view of point J in the middle;

[0085] Figure 33 for Figure 31 Enlarged view at point K;

[0086] Figure 34 Top view of the battery pack provided for other embodiments of this application;

[0087] Figure 35 This is a schematic diagram of the structure of a battery pack provided in some embodiments of this application.

[0088] Icons: 100-Battery pack; 10-Cell unit; 11-Bracket; 111-First surface; 112-Second surface; 113-First section; 1131-First opening; 1132-Opening end of the first section; 1133-First straight section; 11331-First limiting groove; 1134-First bending section; 1135-First receiving section; 1136-First transition section; 1137-First connecting section; 1138-Second connecting section; 1139-Third connecting section; 114-Second section; 1141-Second... 1142 - Opening end of the second part; 1143 - Second straight part; 11431 - Second limiting groove; 1144 - Second bending part; 1145 - Second receiving part; 1146 - Second transition part; 1147 - Fourth connecting part; 1148 - Fifth connecting part; 1149 - Sixth connecting part; 115 - First channel; 1151 - First space; 1152 - Receiving chamber; 12 - Battery cell; 121 - Power output part; 1211 - Main body part; 1212 - Corner part; 122 - Shell; 1221 - This part 1222-Extension; 1223-Angle; 124-Electrode Terminal; 125-Sealant; 126-Insulator; 13-First Support; 131-First Positioning Hole; 14-Expansion Space; 15-Second Support; 151-First Insertion Hole; 16-Heat Conductor; 17-First Fixing Part; 18-Second Fixing Part; 20-Gap; 30-First Seal; 31-First Sealing Part; 32-Second Sealing Part; 33-Third Sealing Part; 34-Fourth Sealing Part; 40-Sealing Structure; 41-Fifth Seal Part; 42-Sixth sealing part; 43-Second sealing element; 50-Side wall; 51-First region; 52-Second region; 53-Third region; 54-Fourth region; 55-Third opening; 60-Receiving cavity; 70-Third sealing element; 80-Circuit board; 90-Fourth sealing element; 110-First conductor; 120-Second conductor; 130-Top wall; 100a-Total positive electrode; 100b-Total negative electrode; 100c-Positive terminal; 100d-Negative terminal; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0089] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0090] Therefore, the following detailed description of embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the present application.

[0091] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0092] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0093] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0094] Currently, the application of rechargeable batteries is becoming increasingly widespread in the market. They are widely used in electric bicycles, electric motorcycles, electric cars, and other electric vehicles, as well as in power tools, drones, energy storage devices, and many other fields. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0095] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, and other performance parameters. In addition, whether the battery can charge and discharge normally as environmental conditions and / or internal battery conditions change is also a key factor to consider.

[0096] The inventors discovered that the internal temperature of a battery fluctuates significantly during charging and discharging. When the battery is used under high-rate, continuous charging and discharging conditions (such as in agricultural drone batteries), the cell temperature of the battery pack can become excessively high. To ensure normal charging and discharging of the battery pack, it is necessary to rapidly reduce the cell temperature.

[0097] In existing technologies, there are two main methods for heat dissipation in battery packs. The first method involves placing heat-conducting components at the tabs of the battery cells to dissipate heat, but this method has a small heat dissipation area and low heat dissipation efficiency. The second method involves placing pipes between the large surfaces of two adjacent cells and blowing air into the pipes through a cooling device. Although this method has a large heat dissipation area and high heat dissipation efficiency, it has a complex structure and occupies a large amount of space.

[0098] Based on the above considerations, in order to improve the heat dissipation capacity of the battery pack and simplify the structure of the heat dissipation structure, this application provides a battery pack, which includes battery cell units stacked along a first direction. Each battery cell unit includes a bracket and a battery cell. The bracket is provided with a first support portion. The battery cell is housed in the bracket. The first support portion is configured to support adjacent brackets along the first direction, so that a gap is formed between two adjacent brackets.

[0099] The first support of the bracket is supported by an adjacent bracket, forming a gap between the two adjacent brackets. The battery cell is housed in the bracket. During charging and discharging, the heat generated by the battery cell can be transferred through the bracket to the gap between the two adjacent brackets. The heat dissipation area is large, the heat transfer path is short, and the thermal resistance is low. The heat generated by the battery cell can be quickly transferred out through this gap, thereby rapidly reducing the temperature of the battery cell and improving the heat dissipation capacity of the battery pack.

[0100] Furthermore, the bracket not only serves to house and protect the battery cells, but also facilitates heat dissipation. It has a simple structure and occupies relatively little space.

[0101] The battery packs disclosed in this application can be used, but are not limited to, in electrical equipment such as electric two-wheelers, power tools, drones, and energy storage devices. The battery packs with the operating conditions provided in this application can also be used as the power system for electrical equipment, which helps improve the heat dissipation capacity of the power system during charging and discharging and enhances the electrical safety of the electrical equipment.

[0102] This application provides an embodiment of an electrical device that uses a battery pack as a power source. The electrical device can be, but is not limited to, electronic devices, power tools, electric vehicles, drones, and energy storage devices. Electronic devices can include mobile phones, tablets, laptops, etc.; power tools can include electric drills, chainsaws, etc.; and electric vehicles can include electric cars, electric motorcycles, electric bicycles, etc.

[0103] like Figure 1 , Figure 2 and Figure 3 As shown, the battery pack 100 includes a plurality of battery cell units 10, which are stacked along a first direction X. Each battery cell unit 10 includes a support 11 and a battery cell 12. The support 11 is provided with a first support portion 13. The battery cell 12 is housed within the support 11. The first support portion 13 is configured to support adjacent supports 11 in the first direction X, so that a gap 20 is formed between two adjacent supports 11.

[0104] Cell 12 can be either a pouch cell or a steel-cased cell.

[0105] The support 11 forms a receiving space for accommodating the battery cell 12. The battery cell 12 is accommodated within the receiving space. Along the first direction X, at least one side of the battery cell 12 may not contact the inner wall of the support 11, so that an expansion space 14 is formed between the battery cell 12 and the inner wall of the support 11. The expansion space 14 is used for the battery cell 12 to expand during charging and discharging, so that the inner wall of the support 11 does not prematurely compress the battery cell 12. Optionally, along the first direction X, a compressible elastic element is provided between the battery cell 12 and the support 11. The elastic element can provide expansion space for the battery cell 12 and also play a buffering role between the battery cell 12 and the support 11. Optionally, along the first direction X, a gap is provided between the battery cell 12 and the support 11 to provide expansion space for the battery cell 12. Optionally, the elastic element includes foam.

[0106] A first support portion 13 is disposed on the side of the bracket 11 facing the adjacent bracket 11 along the first direction X. The first support portion 13 protrudes from the surface of the bracket 11 facing the adjacent bracket 11. The first support portion 13 and the bracket 11 can be separately disposed and then connected into an integral structure, or the first support portion 13 and the bracket 11 can be integrally formed. The first support portion 13 is supported on the surface of the adjacent bracket 11 facing the first support portion 13, so that a gap 20 is formed between two adjacent brackets 11 along the first direction X. The gap 20 can be used for heat dissipation. The gap 20 extends through at least one direction perpendicular to the first direction X, so that the heat generated during the charging and discharging process can be transferred from the direction through which the gap 20 extends.

[0107] The first support portion 13 of the bracket 11 supports adjacent brackets 11, forming a gap 20 between the two adjacent brackets 11. The battery cell 12 is housed within the bracket 11. During charging and discharging, the heat generated by the battery cell 12 can be transferred through the bracket 11 to the gap 20 between the two adjacent brackets 11. This results in a large heat dissipation area, a short heat transfer path, and low thermal resistance. The heat generated by the battery cell 12 can be quickly transferred away through this gap 20, thereby rapidly reducing the temperature of the battery cell 12 and improving the heat dissipation capacity of the battery pack 100, thus contributing to the safety performance of the battery pack 100. The bracket 11 serves to house and protect the battery cell 12, and also facilitates heat dissipation. It has a simple structure and occupies little space.

[0108] like Figures 2-4 As shown, in some embodiments, the bracket 11 is further provided with a second support portion 15. Along the first direction X, the second support portion 15 and the first support portion 13 are respectively disposed on both sides of the bracket 11, and the second support portion 15 is configured to cooperate with the first support portion 13 of the adjacent bracket 11. This can improve the positioning accuracy and stacking stability of two adjacent battery cell units 10, thereby improving the stability of the entire battery pack 100 structure.

[0109] In this embodiment, the second support portion 15 is configured to positionally engage with the first support portion 13 of the adjacent bracket 11. For any bracket 11 of a cell unit 10, the second support portion 15 and the first support portion 13 are respectively disposed on opposite sides of the bracket 11 along the first direction X. Along the first direction X, the bracket 11 has opposing first surfaces 111 and second surfaces 112, with the first support portion 13 disposed on the first surface 111 and the second support portion 15 disposed on the second surface 112. For two adjacent cell units 10, the positioning and engaging second support portion 15 and first support portion 13 are located within a gap 20.

[0110] like Figure 2 , Figure 3 , Figure 4 As shown, along the first direction X, a first positioning hole 131 is formed on the end face of the first support portion 13 away from the end connected to the bracket 11, and the second support portion 15 is disposed within the first positioning hole 131. Figure 4 As shown, after the second support portion 15 is disposed within the first positioning hole 131, the second support portion 15 can abut against the adjacent bracket 11. Figure 5 , Figure 6 As shown, after the second support part 15 is disposed in the first positioning hole 131, along the first direction X, the second support part 15 may also be spaced apart from the adjacent bracket 11.

[0111] like Figures 2-6 As shown, in the embodiment where the second support portion 15 is inserted into the first positioning hole 131 of the first support portion 13, the second support portion 15 has a hollow structure, which can reduce the weight of the cell unit 10, thereby reducing the weight of the battery pack 100. In other embodiments, the second support portion 15 may also be a solid structure.

[0112] like Figure 7 , Figure 8 As shown, in some embodiments, the second support portion 15 is provided with a first insertion hole 151, and the first support portion 13 is inserted into the first insertion hole 151. Along the first direction X, there is a gap between the second support portion 15 and the adjacent bracket 11. In this embodiment, the second support portion 15 can be a hollow structure to reduce the weight of the cell unit 10, thereby reducing the weight of the battery pack 100.

[0113] like Figure 9 , Figure 10 , Figure 11 As shown, in some embodiments, the bracket 11 may not have a second support portion 15. The first support portion 13 supports the second surface 112 of the adjacent bracket 11, so that a gap 20 is formed between the two adjacent brackets 11. In this embodiment, the first support portion 13 may be a hollow structure or a solid structure.

[0114] like Figure 12 , Figure 13 , Figure 14 As shown, in some other embodiments, the second support portion 15 may be a recess formed on the second surface 112 of the bracket 11, and the first support portion 13 is inserted into the recess (second support portion 15) of the adjacent bracket 11.

[0115] like Figure 15 As shown, in some embodiments, the bracket 11 is provided with a plurality of first support portions 13, which are spaced apart.

[0116] "Multiple" refers to two or more. In some embodiments, the number of first support portions 13 may also be one. In embodiments where there are multiple first support portions 13, there may also be multiple second support portions 15.

[0117] The multiple first support portions 13 of the bracket 11 are spaced apart and jointly support adjacent brackets 11, which can improve support stability and thus form a stable gap 20 between two adjacent brackets 11, which is conducive to the stable and rapid heat dissipation of the battery cell 12. The multiple first support portions 13 jointly supporting adjacent brackets 11 can also improve the stacking stability of two adjacent battery cell units 10.

[0118] In embodiments where there are multiple first support portions 13, the arrangement of the multiple first support portions 13 can be varied. For example, all the first support portions 13 may be arranged at intervals along a straight line. Alternatively, all the first support portions 13 may be arranged in an array, such as... Figure 15 As shown, in some embodiments, a plurality of first support portions 13 are arranged in a rectangular array on the bracket 11. A portion of the plurality of first support portions 13 are arranged at intervals along the second direction Y on one side of the bracket 11 along the third direction Z, and another portion of the plurality of first support portions 13 are arranged at intervals along the second direction Y on the other side of the bracket 11 along the third direction Z. Figure 15 As shown, the bracket 11 is provided with six first support parts 13. Three of the six first support parts 13 are arranged at intervals along the second direction Y on one side of the bracket 11 along the third direction Z, and the other three of the six first support parts 13 are arranged at intervals along the second direction Y on the other side of the bracket 11 along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0119] In other embodiments, the plurality of first support portions 13 may be arranged in a ring array, a path array, or the like.

[0120] The multiple first support parts 13 can be arranged at uniform intervals or at non-uniform intervals.

[0121] Multiple first support sections 13 are arranged in a rectangular array on the bracket 11, which not only improves the stacking stability of two adjacent battery cell units 10, but also facilitates uniform heat dissipation of the battery cell 12.

[0122] In some embodiments, such as Figure 16 As shown, the battery cell unit 10 also includes a heat-conducting component 16, which is disposed on the inner surface of the bracket 11, which is beneficial to improving the efficiency of heat transfer from the battery cell 12 to the outside.

[0123] The heat-conducting component 16 can be supported by a material with good thermal conductivity, such as polyethylene terephthalate, polyimide, or polycarbonate.

[0124] The heat-conducting component 16 is fixed to the inner surface of the bracket 11. The heat-conducting component 16 may be bonded to the inner surface of the bracket 11 or fixed to the inner surface of the bracket 11 by other connection methods.

[0125] The heat-conducting element 16 is disposed on the inner surface of the bracket 11, which enables the heat generated by the battery cell 12 to be quickly transferred to the bracket 11 and quickly transferred out from the gap 20 between adjacent brackets 11, thereby improving the heat dissipation efficiency of the battery cell 12.

[0126] like Figure 15 , Figure 16 As shown, the bracket 11 includes a first part 113 and a second part 114. The first part 113 and the second part 114 are arranged along the first direction X. The first part 113 and the second part 114 together define an accommodating space (not shown in the figure), and the battery cell 12 is housed in the accommodating space.

[0127] In this embodiment, the bracket 11 includes a first part 113 and a second part 114 that are separately disposed. The first part 113 and the second part 114 are connected to define a space for accommodating the battery cell 12. It can be understood that the main body 1211 of the bracket 11 is formed by connecting the first part 113 and the second part 114. The first part 113 and the second part 114 can be welded together. Alternatively, a detachable connection can be achieved by means of bolt connection, screw connection, adhesive bonding, snap-fit ​​connection, etc.

[0128] like Figure 16 , Figure 17 , Figure 18 As shown, the first portion 113 forms a first cavity (not shown) with a first opening 1131, which faces the second portion 114 in a direction opposite to the first direction X. The second portion 114 forms a second cavity (not shown) with a second opening 1141, which faces the first portion 113 in the first direction X. The opening ends 1132 of the first portion and 1142 of the second portion are abutted against each other in the first direction X. Figure 15 (As shown in the figure) to form a receiving space together, which facilitates the entry of the battery cell 12 into the bracket 11 and makes it easy to maintain different parts of the bracket 11. The opening end 1132 of the first part and the opening end 1142 of the second part fit together in the first direction X, which can make the sealing performance between the first part 113 and the second part 114 better or reduce the sealing difficulty after the first part 113 and the second part 114 are connected.

[0129] A first support portion 13 is disposed on a first portion 113, and a second support portion 15 is disposed on a second portion 114. The first surface 111 of the bracket 11 is the surface of the first portion 113 that faces away from the second portion 114 along a first direction X, and the first surface 111 is arranged opposite to the open end 1132 of the first portion. The second surface 112 of the bracket 11 is the surface of the second portion 114 that faces away from the first portion 113 along a direction opposite to the first direction X, and the second surface 112 is arranged opposite to the open end 1142 of the second portion.

[0130] like Figure 16 , Figure 17 , Figure 18 As shown, in some embodiments, the first part 113 is provided with a first fixing part 17, and the second part 114 is provided with a second fixing part 18. The first fixing part 17 and the second fixing part 18 are fixedly engaged along the first direction X.

[0131] The first fixing part 17 is disposed at the opening end 1132 of the first part, and the second fixing part 18 is disposed at the opening end 1142 of the second part. One of the first fixing part 17 and the second fixing part 18 is a protrusion, and the other is a groove. The protrusion is inserted into the groove along the first direction X to achieve a fixed engagement between the first fixing part 17 and the second fixing part 18. Figure 16 , Figure 17 and Figure 18 As shown, the first fixing part 17 is a protrusion that extends from the opening end 1132 of the first part toward the second part 114, and the second fixing part 18 is a groove that recesses from the opening end 1142 of the second part toward the direction away from the first part 113. The depth of the groove (second fixing part 18) recessed from the opening end 1142 of the second part toward the direction away from the first part 113 is equal to the dimension of the protrusion (first fixing part 17) extending from the opening end 1132 of the first part toward the direction facing the second part 114, which facilitates the fit between the opening end 1132 of the first part and the opening end 1142 of the second part.

[0132] The number of first fixing parts 17 can be one or more, and the number of second fixing parts 18 can also be one or more. The number of first fixing parts 17 and second fixing parts 18 is the same. The first fixing parts 17 and second fixing parts 18 are provided in a one-to-one correspondence, and the first fixing part 17 and its corresponding third part are positioned and engaged.

[0133] In embodiments where there are multiple first fixing parts 17 and multiple second fixing parts 18, the arrangement of the multiple first fixing parts 17 and the arrangement of the multiple second fixing parts 18 are the same, so that the first fixing parts 17 can be fixedly engaged with the corresponding second fixing parts 18.

[0134] The arrangement of the plurality of first fixing parts 17 can take many forms. For example, all the first fixing parts 17 may be arranged at intervals along a straight line. Alternatively, the plurality of first fixing parts 17 may be arranged in an array. For instance, in some embodiments, the plurality of first fixing parts 17 may be distributed in a rectangular array at the opening end 1132 of the first part. A portion of the plurality of first fixing parts 17 may be arranged at intervals along the second direction Y at the opening end 1132 of the first part along the third direction Z, while another portion of the plurality of first fixing parts 17 may be arranged at intervals along the second direction Y at the opening end 1132 of the first part along the third direction Z. Figure 17 As shown, the first part 113 includes six first fixing parts 17. Three of the six first fixing parts 17 are arranged at intervals along the second direction Y on one side of the opening end 1132 of the first part along the third direction Z. The other three of the six first fixing parts 17 are arranged at intervals along the second direction Y on the other side of the opening end 1132 of the first part along the third direction Z (see reference). Figure 17 and Figure 24 ).

[0135] During the assembly of the first part 113 and the second part 114 to form the bracket 11, the first fixing part 17 of the first part 113 and the second fixing part 18 of the second part 114 cooperate, which helps to improve the accurate positioning of the first fixing part 17 and the second fixing part 18 during the assembly process, facilitates the assembly and forming of the bracket 11, and enables the first part 113 and the second part 114 to maintain a relatively stable cooperation relationship, thereby making the bracket 11 structurally stable.

[0136] In the embodiment where the bracket 11 is provided with the second support portion 15, please continue to refer to... Figure 16 , Figure 17 , Figure 18A first support portion 13 is disposed on a first portion 113, and a second support portion 15 is disposed on a second portion 114. The second support portion 15 is configured to position and cooperate with the first support portion 13 of the adjacent bracket 11. Along the first direction X, a first fixing portion 17 and a first support portion 13 are respectively disposed on both sides of the first portion 113, and a second fixing portion 18 and a second support portion 15 are respectively disposed on both sides of the second portion 114.

[0137] The first support portion 13 is disposed on the side of the first portion 113 opposite to the second portion 114 along the first direction X, and the second support portion 15 is disposed on the side of the second portion 114 opposite to the first portion 113 along the first direction X.

[0138] Both the first fixing part 17 and the first supporting part 13 are disposed in the first part 113. The number of the first fixing part 17 and the first supporting part 13 may be the same or different. The embodiments of this application show the case where the number of the first fixing part 17 and the first supporting part 13 are the same, and there are six of each.

[0139] Both the second fixing part 18 and the second supporting part 15 are disposed in the second part 114. The number of the second fixing part 18 and the second supporting part 15 may be the same or different. The embodiments of this application show the case where the number of the second fixing part 18 and the second supporting part 15 is the same, and there are six of each.

[0140] The first fixing part 17 and the first support part 13 are respectively disposed on both sides of the first part 113, and the second fixing part 18 and the second support part 15 are respectively disposed on both sides of the second part 114. This facilitates manufacturing and allows the second support part 15 and the first support part 13 to cooperate, and the first fixing part 17 and the second fixing part 18 of the adjacent bracket 11 to cooperate without interfering with each other.

[0141] like Figure 16 , Figure 17 , Figure 18 As shown, along the first direction X, the first fixing part 17 is correspondingly provided with the first support part 13, and the second support part 15 is correspondingly provided with the second fixing part 18.

[0142] The first fixing part 17 and the first supporting part 13 are provided in a one-to-one correspondence. The first fixing part 17 and the first supporting part 13 are positioned correspondingly, and along the first direction X, the projection of the first fixing part 17 and the projection of the corresponding first supporting part 13 at least partially overlap. The second supporting part 15 and the second fixing part 18 are provided in a one-to-one correspondence. The second supporting part 15 and the second fixing part 18 are positioned correspondingly, and along the first direction X, the projection of the second supporting part 15 and the projection of the corresponding second fixing part 18 at least partially overlap.

[0143] In other embodiments, along the first direction X, the first fixing part 17 and the first support part 13 may not be correspondingly provided, that is, the number of the first fixing part 17 and the first support part 13 are different, and / or along the first direction X, the projection of the first fixing part 17 on the first portion 113 and the projection of the first support part 13 on the first portion 113 are completely misaligned. The second support part 15 and the second fixing part 18 may not be correspondingly provided, that is, the number of the second support part 15 and the second fixing part 18 are different, and / or along the first direction X, the projection of the second support part 15 on the second portion 114 and the projection of the second fixing part 18 on the second portion 114 are completely misaligned.

[0144] The first fixing part 17 is provided correspondingly to the first support part 13, and the second support part 15 is provided correspondingly to the second fixing part 18, which facilitates the manufacturing of the first part 113 and the second part 114.

[0145] like Figure 19 , Figure 20 As shown, in some embodiments, at least one end of the cell unit 10 along the second direction Y forms a power output section 121, and a first channel 115 is formed between the first portion 113 and the second portion 114 through which the power output section 121 passes. The second direction Y is perpendicular to the first direction X. The battery pack 100 also includes a first sealing member 30 ( Figure 16 As shown in the figure, the first seal 30 is configured to seal the first channel 115.

[0146] like Figures 21-23 As shown, the battery cell 12 includes a housing 122, an electrode assembly disposed within the housing 122, and two electrode terminals 124 connected to the electrode assembly and extending from the housing 122. The two electrode terminals 124 have opposite polarities, that is, one electrode terminal 124 is a positive electrode terminal and the other is a negative electrode terminal.

[0147] The electrode assembly includes a separator (not shown in the figure), a positive electrode (not shown in the figure), and a negative electrode (not shown in the figure), each with opposite polarity. The positive electrode includes a positive active material layer (not shown in the figure) and a positive current collector (not shown in the figure). The negative electrode includes a negative active material layer (not shown in the figure) and a negative current collector (not shown in the figure). Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. The positive tab and the current collector of the positive electrode are electrically connected, and the negative tab and the current collector of the negative electrode are electrically connected.

[0148] The electrode assembly can be a wound electrode assembly, in which a separator, a positive electrode, and a negative electrode are stacked and wound around a winding axis to form a wound electrode assembly. The electrode assembly can also be a stacked electrode assembly.

[0149] Two electrode terminals 124 extend out of the housing 122 from the same end of the housing 122, or they may extend out of the housing 122 from opposite ends. Figure 21 and Figure 23 The diagram shows two electrode terminals 124 extending out of the housing 122 from both ends in the second direction Y.

[0150] like Figure 21 , Figure 22 As shown, along the second direction Y, the housing 122 includes a body portion 1221 and extension portions 1222 respectively connected to both ends of the body portion 1221 in the second direction Y. The body portion 1221 defines a main cavity (not shown) for accommodating an electrode assembly, and each extension portion 1222 defines an extended cavity (not shown) for accommodating a portion of an electrode terminal 124 along the second direction Y. The main cavity and the extended cavities are in communication. The electrode terminal 124 and the corresponding extension portion 1222 are sealed together by a sealant 125. An angle 1223 is formed at both ends of the extension portion 1222 along the third direction Z.

[0151] like Figure 23 As shown, in some embodiments, the battery cell 10 further includes an insulating member 126, which covers the outer surface of the housing 122 to provide waterproofing, insulation, and leak-proofing. In some embodiments, a portion of the insulating member 126 covers the outer surface of the main body 1221, and another portion of the insulating member 126 covers the outer surfaces of the two extensions 1222, meaning the insulating member 126 covers the entire outer surface of the housing 122. In this embodiment, an electrode terminal 124, an extension 1222, and the insulating member 126 covering the outer surface of the extension 1222 together form a power output portion 121 of the battery cell 12. In this embodiment, the extension 1222 of the power output section 121 and the insulating member 126 covering the outer surface of the extension 1222 are both located within the first channel 115; the electrode terminal 124 of the power output section 121 extends out of the first channel 115 along the second direction Y; the sealant 125 of the power output section 121 can extend out of the first channel 115 along the second direction Y, or it can be completely located within the first channel 115. Figure 20 The diagram shows the sealant 125 extending out of the first channel 115 along the second direction Y.

[0152] In other embodiments, the insulating member 126 may be entirely fitted around the outer periphery of the body portion 1221, that is, the insulating member 126 may be fitted onto a portion of the outer surface of the housing 122. In this embodiment, an electrode terminal 124 and an extension 1222 together form a power output portion 121 of the battery cell 12. In this embodiment, the extension 1222 of the power output portion 121 is completely located within the first channel 115; the electrode terminal 124 of the power output portion 121 extends out of the first channel 115 along the second direction Y; the sealant 125 of the power output portion 121 may extend out of the first channel 115 along the second direction Y, or it may be completely located within the first channel 115.

[0153] like Figure 21 As shown, the battery cell 12 may also exclude the insulating member 126, in which case an electrode terminal 124 and an extension 1222 together form a power output portion 121 of the battery cell 12. In this embodiment, the extension 1222 of the power output portion 121 may be completely located within the first channel 115; the electrode terminal 124 of the power output portion 121 extends out of the first channel 115 along the second direction Y; the sealant 125 of the power output portion 121 may extend out of the first channel 115 along the second direction Y, or may be completely located within the first channel 115.

[0154] Two electrode terminals 124 of the battery cell 12 extend from opposite ends of the housing 122 along the second direction Y. Two power output sections 121 also extend from opposite ends along the second direction Y. The two power output sections 121 have opposite polarities, reducing the risk of contact between the two power output sections 121 with opposite polarities, thereby reducing the risk of short circuit in the battery pack 100. Correspondingly, two first channels 115 are formed between the first part 113 and the second part 114, and the two first channels 115 are arranged at intervals relative to each other along the second direction Y.

[0155] "The first seal 30 is configured to seal the first channel 115" means that the first seal 30 seals the space between the first part 113 and the power output part 121 and seals the space between the second part 114 and the power output part 121.

[0156] The power output section 121 extends from the first channel 115, facilitating electrical connection between the power output section 121 and other structures to output the power of the battery cell 12. The first seal 30 seals the first channel 115, reducing the risk of leakage from the battery cell 12 and the entry of external impurities into the battery cell 12.

[0157] Please refer to the reference. Figure 20 , Figure 21 , Figure 23In some embodiments, the power output unit 121 includes a main body 1211, and the main body 1211 is bent at both ends in the third direction Z to form angled portions 1212; the first channel 115 includes a first space 1151 and receiving chambers 1152 disposed at both ends of the first space 1151 along the third direction Z, the receiving chambers 1152 are connected to the first space 1151, the main body 1211 is accommodated in the first space 1151, and the two angled portions 1212 are respectively accommodated in the two receiving chambers 1152; wherein, along the first direction X, the size of the receiving chamber 1152 is larger than the size of the first space 1151, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0158] Along the first direction X, the size of the accommodating chamber 1152 is larger than that of the first space 1151, i.e., H1 > H2 in the figure.

[0159] The power output section 121 has a bend 1212 formed at the position corresponding to the bend 1223. Please refer to... Figure 23 In embodiments of the battery cell 12 excluding the insulating member 126, the bend 1212 is the bend 1223, and the main body 1211 is formed by the electrode terminal 124 and the sealant 125. Please refer to... Figure 21 In embodiments where the battery cell 12 includes an insulating member 126, the corner portion 1212 may be formed by the corner 1223 and the insulating member 126 covering the corner 1223. The main body portion 1211 is formed by the electrode terminal 124, the sealant 125, and the portion covering the extension portion 1222 and located between the two corner portions 1212 along the third direction Z.

[0160] The angled portion 1212 of the power output section 121 has an irregular shape and a larger dimension along the first direction X compared to the main body 1211. Therefore, the dimension of the receiving chamber 1152 accommodating the angled portion 1212 in the first direction X is larger than the dimension of the first space 1151 in the first direction X. The dimension of the receiving chamber 1152 in the first direction X matches the dimension of the corresponding angled portion 1212 in the first direction X, and the dimension of the first space 1151 in the first direction X matches the dimension of the first space 1151 in the first direction X. This facilitates the power output section 121 extending out of the first channel 115 of the bracket 11 and reduces the difficulty of sealing the first channel 115. Furthermore, the power output section 121 has angled portions 1212 formed at both ends of its main body 1211 along the third direction Z, which can reduce the dimension of the power output section 121 in the third direction Z.

[0161] In other embodiments, the dimensions of the receiving chamber 1152 along the first direction X may be the same as the dimensions of the first space 1151.

[0162] In embodiments where the support 11 includes a first portion 113 and a second portion 114, such as Figures 17-20As shown, the first part 113 includes a first straight part 1133 and two first bent parts 1134. Along the third direction Z, the two first bent parts 1134 are connected to the two ends of the first straight part 1133. The second part 114 includes a second straight part 1143 and two second bent parts 1144. Along the third direction Z, the two second bent parts 1144 are connected to the two ends of the second straight part 1143. The first straight part 1133 and the second straight part 1143 are arranged opposite to each other along the first direction X to form a first space 1151. One first bent part 1134 and one second bent part 1144 form a receiving chamber 1152.

[0163] Both the first straight section 1133 and the second straight section 1143 are flat plate structures extending along the third direction Z.

[0164] The first bending portion 1134 includes a first connecting portion 1137, a second connecting portion 1138, and a third connecting portion 1139 connected in sequence. The first connecting portion 1137 and the third connecting portion 1139 are arranged opposite each other along a third direction Z. One end of the first connecting portion 1137 along the first direction X is connected to the second connecting portion 1138, and one end of the third connecting portion 1139 along the first direction X is connected to the second connecting portion 1138. Along the first direction X, the end face of the third connecting portion 1139 facing away from the second connecting portion 1138 forms the opening end 1132 of the first part. Along the first direction X, the end of the first connecting portion 1137 away from the second connecting portion 1138 is connected to the first straight portion 1133. Along the first direction X, the first straight portion 1133 is closer to the second part 114 than the second connecting portion 1138. The second bending portion 1144 includes a fourth connecting portion 1147, a fifth connecting portion 1148, and a sixth connecting portion 1149 connected in sequence. The fourth connecting portion 1147 and the sixth connecting portion 1149 are arranged opposite each other along a third direction Z. One end of the fourth connecting portion 1147 along the first direction X is connected to the fifth connecting portion 1148, and one end of the sixth connecting portion 1149 along the first direction X is connected to the fifth connecting portion 1148. Along the first direction X, the end face of the sixth connecting portion 1149 facing away from the fifth connecting portion 1148 forms the opening end 1142 of the second part. Along the first direction X, the second straight portion 1143 is closer to the first part 113 relative to the fifth connecting portion 1148, such that along the first direction X, the distance between the first straight portion 1133 and the second straight portion 1143 is smaller than the distance between the second connecting portion 1138 and the fifth connecting portion 1148, thereby making the size of the first space 1151 along the first direction X smaller than the size of the receiving chamber 1152 along the first direction X.

[0165] The first space 1151 is formed by the first straight portion 1133 of the first part 113 and the second straight portion 1143 of the second part 114. Each accommodating chamber 1152 is formed by a first bend 1134 of the first part 113 and a second bend 1144 of the second part 114, so that the power output unit 121 can enter the first channel 115 and extend out of the first channel 115.

[0166] like Figure 24 , Figure 25 , Figure 26 As shown, in some embodiments, a first limiting groove 11331 extending in the third direction Z is provided on the first straight portion 1133, and a portion of the first sealing member 30 is accommodated in the first limiting groove 11331; and / or, a second limiting groove 11431 extending in the third direction Z is provided on the second straight portion 1143, and a portion of the first sealing member 30 is accommodated in the second limiting groove 11431.

[0167] In this embodiment, the first straight portion 1133 is provided with a first limiting groove 11331 and the second straight portion 1143 is provided with a second limiting groove 11431. The first limiting groove 11331 is disposed on the surface of the first straight portion 1133 facing the second straight portion 1143 along the first direction X. The first limiting groove 11331 extends along the third direction Z and passes through both ends of the first straight portion 1133, so that the first limiting groove 11331 communicates with the two receiving chambers 1152. The second limiting groove 11431 is disposed on the surface of the second straight portion 1143 facing the first straight portion 1133 along the first direction X. The second limiting groove 11431 extends along the third direction Z and passes through both ends of the second straight portion 1143, so that the second limiting groove 11431 and the two receiving chambers 1152 are connected, which facilitates the connection of the part of the first sealing member 30 located in the first limiting groove 11331, the part of the second limiting groove 11431 and the part located in the receiving chamber 1152 to form an integral structure, which is beneficial to improving the sealing performance.

[0168] In other embodiments, the first straight portion 1133 may be provided with a first limiting groove 11331, while the second straight portion 1143 may not be provided with a second limiting groove 11431; or the first straight portion 1133 may not be provided with a first limiting groove 11331, while the second straight portion 1143 may be provided with a second limiting groove 11431.

[0169] In other embodiments, the first straight portion 1133 may not have a first limiting groove 11331 and the second straight portion 1143 may not have a second limiting groove 11431. A portion of the first sealing member 30 seals between the surface of the first straight portion 1133 facing the second straight portion 1143 and the main body portion 1211 for power output, and another portion of the first sealing member 30 seals between the surface of the second straight portion 1143 facing the first straight portion 1133 and the main body portion 1211 for power output, thereby sealing the first space 1151.

[0170] A portion of the first sealing element 30 is accommodated within the first limiting groove 11331, which limits the first sealing element 30 to provide a stable seal for the first space 1151; and / or a portion of the first sealing element 30 is accommodated within the second limiting groove 11431, which limits the first sealing element 30 to provide a stable seal for the first space 1151.

[0171] In some embodiments, please refer to Figure 16 , Figure 26 The first sealing element 30 includes a first sealing part 31, a second sealing part 32, a third sealing part 33 and a fourth sealing part 34. The first sealing part 31 and the second sealing part 32 are sealed in the first space 1151 and are located on both sides of the main body 1211 along the first direction X. The third sealing part 33 is located in a receiving chamber 1152 and covers the corner part 1212. The fourth sealing part 34 is located in another receiving chamber 1152 and covers the corner part 1212.

[0172] The first sealing part 31, the second sealing part 32, the third sealing part 33, and the fourth sealing part 34 can be separate and independent sealing parts. Alternatively, they can be separate parts connected to form a single integral structure. Or, they can be integrally molded, forming the first sealing element 30 as an integrally molded structure. "Integral molded structure" refers to a structure formed using an integral molding process, such as injection molding or potting. Optionally, the first sealing part 31 includes sealant. Optionally, the second sealing part 32 includes sealant. Optionally, the third sealing part 33 includes sealant. Optionally, the fourth sealing part 34 includes sealant.

[0173] The first sealing part 31 is accommodated in the first limiting groove 11331 to seal the space between the first straight part 1133 and the power output part 121. The second sealing part 32 is accommodated in the second limiting groove 11431 to seal the space between the second straight part 1143 and the power output part 121.

[0174] The first sealing part 31, the second sealing part 32, the third sealing part 33 and the fourth sealing part 34 can also be connected to the power output part 121. For example, the first sealing part 31, the second sealing part 32, the third sealing part 33 and the fourth sealing part 34 are all bonded to the power output part 121.

[0175] In some implementations, the first sealing part 31 may also be connected to the first straight part 1133, for example, the first sealing part 31 may be bonded to the first straight part 1133.

[0176] In some implementations, the second sealing part 32 may also be connected to the second straight part 1143, for example, the second sealing part 32 may be bonded to the second straight part 1143.

[0177] In some implementations, the third sealing part 33 may also be connected to the first bending part 1134 and the second bending part 1144, for example, the third sealing part 33 may be bonded to the first bending part 1134 and the second bending part 1144.

[0178] In some implementations, the fourth sealing part 34 may also be connected to the first bending part 1134 and the second bending part 1144, for example, the fourth sealing part 34 may be bonded to the first bending part 1134 and the second bending part 1144.

[0179] The third sealing part 33 and the fourth sealing part 34 respectively cover the two corner parts 1212. It can be understood that the two corner parts 1212 are located within the space defined by the third sealing part 33 and the fourth sealing part 34, which can increase the contact area between the third sealing part 33 and the fourth sealing part 34 and the corresponding corner parts 1212, thereby improving the sealing performance.

[0180] The first sealing part 31 and the second sealing part 32 are both sealed in the first space 1151 and are located on both sides of the main body 1211 along the first direction X, which can improve the sealing performance of the first space 1151. The third sealing part 33 and the fourth sealing part 34 are respectively accommodated in the two accommodating chambers 1152 and cover the corresponding corner part 1212, which can improve the sealing performance between the corner part 1212 and the bracket 11.

[0181] In some embodiments, the third sealing portion 33 and the fourth sealing portion 34 are respectively sealed in two receiving chambers 1152.

[0182] Potting involves mechanically or manually filling a receiving chamber 1152 containing the corner portion 1212 into a liquid compound, which then cures under ambient or heated conditions to form high-performance thermosetting third and fourth sealing portions 33 and 34. The fluidity of the liquid compound allows it to diffuse sufficiently within the receiving chamber 1152, thereby maximizing contact with each surface of the corner portion 1212 and increasing the contact area between the corner portion 1212 and the liquid compound, thus increasing the contact area between the corner portion 1212 and the third and fourth sealing portions 33 and 34.

[0183] In embodiments where the first limiting groove 11331 penetrates the first straight portion 1133 along a third direction Z and the second limiting groove 11431 penetrates the second straight portion 1143 along a third direction Z, during the potting process, the liquid composite can flow into the first limiting groove 11331 and the second limiting groove 11431, so that the third sealing portion 33 and the fourth sealing portion 34 are both connected to the first sealing portion 31 contained in the first limiting groove 11331 and the second sealing portion 32 contained in the second limiting groove 11431. In this case, the first sealing portion 31, the second sealing portion 32, the third sealing portion 33, and the fourth sealing portion 34 are separately arranged and then connected into an integral structure.

[0184] In the embodiment where the first limiting groove 11331 penetrates the first straight portion 1133 along a third direction Z and the second limiting groove 11431 penetrates the second straight portion 1143 along a third direction Z, before injecting the liquid compound into the receiving chamber 1152, the first sealing part 31 is not provided in the first limiting groove 11331 and the second sealing part 32 is not provided in the second limiting groove 11431. During the injection of the liquid compound into the receiving chamber 1152, the liquid compound can flow into the first limiting groove 11331 and the second limiting groove 11431, and the first sealing part 31 and the second sealing part 32 are formed in the first limiting groove 11331 and the second limiting groove 11431 respectively, that is, the first sealing part 31 and the second sealing part 32 are sealed in the first limiting groove 11331 and the second limiting groove 11431. In this case, the first sealing part 31, the second sealing part 32, the third sealing part 33 and the fourth sealing part 34 are integrally formed.

[0185] The third sealing portion 33 and the fourth sealing portion 34 formed by potting can enhance the overall performance of the third sealing portion 33, the corner portion 1212 and the bracket 11, as well as the fourth sealing portion 34, the corner portion 1212 and the bracket 11, thereby improving resistance to external impacts and vibrations, and enhancing waterproof and moisture-proof performance. Furthermore, the potting process makes it easier for the third sealing portion 33 and the fourth sealing portion 34 to cover the corresponding corner portion 1212.

[0186] like Figure 3 , Figure 27As shown, in some embodiments, two adjacent battery cells 10 are provided with two sealing structures 40 along the second direction Y. The two sealing structures 40 are respectively provided at both ends of the bracket 11 to seal the two ends of the gap 20 along the second direction Y.

[0187] The two sealing structures 40 block the two ends of the gap 20 along the second direction Y, and the gap 20 is connected along the third direction Z, so that the heat of the cell 12 can be quickly transferred along the third direction Z.

[0188] Two sealing structures 40 respectively seal the two ends of the gap 20 along the second direction Y, reducing the risk that other impurities will enter the gap 20 along the two ends of the gap 20 in the second direction Y and block or occupy part of the gap 20, thereby increasing the heat dissipation area of ​​the gap 20.

[0189] The sealing structure 40 can take many forms. For example, the sealing structure 40 can be a sealing gasket pressed between two adjacent supports 11, or it can be a sealant filled between two adjacent battery cells 10. For another example... Figure 27 As shown, in some embodiments, the sealing structure 40 includes a fifth sealing part 41 and a sixth sealing part 42. Along the first direction X, the fifth sealing part 41 and the sixth sealing part 42 are respectively disposed on two adjacent brackets 11, and the fifth sealing part 41 and the sixth sealing part 42 are sealed together.

[0190] The fifth sealing part 41 is a sealing groove, and the sixth sealing part 42 can be inserted into the sealing groove. For any one battery cell unit 10, the bracket 11 is provided with a fifth sealing part 41 and a sixth sealing part 42 on both sides along the first direction X. For two adjacent battery cell units 10, the fifth sealing part 41 on one of the two adjacent brackets 11 is sealed and engaged with the sixth sealing part 42 on the other.

[0191] Please refer to the reference. Figure 17 , Figure 18 , Figure 27 , Figure 28As shown, in an embodiment where the support 11 includes a first portion 113 and a second portion 114, the first portion 113 further includes a first receiving portion 1135 and two first transition portions 1136, the two first transition portions 1136 being respectively connected to both ends of the first receiving portion 1135 along the second direction Y. Two first straight portions 1133 are respectively connected to the ends of the two first transition portions 1136 along the second direction Y away from the first receiving portion 1135. Each first straight portion 1133 has a first bent portion 1134 connected to both ends along the third direction Z. Along the first direction X, the end face of the second connecting portion 1138 of the first bent portion 1134 facing the second portion 114, the end face of the first transition portion 1136 facing the second portion 114, and the end face of the first receiving portion 1135 facing the second portion 114 are coplanar and together constitute the opening end 1132 of the first portion. The second portion 114 also includes a second receiving portion 1145 and two second transition portions 1146, which are respectively connected to the two ends of the second receiving portion 1145 along the second direction Y. Two second straight portions 1143 are respectively connected to the ends of the two second transition portions 1146 along the second direction Y away from the second receiving portion 1145. Each second straight portion 1143 is connected to a second bent portion 1144 at both ends along the third direction Z. Along the first direction X, the fifth connecting portion 1148 of the second bending portion 1144 facing the end face of the first portion 113, the end face of the second transition portion 1146 facing the first portion 113, and the end face of the second receiving portion 1145 facing the first portion 113 are coplanar and together constitute the opening end 1132 of the first portion.

[0192] The first transition portion 1136 and the second transition portion 1146 are provided in a one-to-one correspondence. The first transition portion 1136 and the corresponding second transition portion 1146 are provided opposite to each other in the first direction X, and the projection of the second transition portion 1146 completely coincides with the first transition portion 1136 along the first direction X.

[0193] The dimension of the first transition portion 1136 along the third direction Z is greater than the dimension of the first receiving portion 1135 along the third direction Z. The dimension of the second transition portion 1146 along the third direction Z is greater than the dimension of the second receiving portion 1145 along the third direction Z.

[0194] The fifth sealing part 41 is a sealing groove provided on the surface of the first transition part 1136 facing away from the second part 114 along the first direction X and recessed along the direction close to the second part 114. The sixth sealing part 42 protrudes from the surface of the second transition part 1146 facing away from the first part 113 along the first direction X. The second transition parts 1146 are each provided with the fifth sealing part 41, and the two first transition parts 1136 are each provided with the sixth sealing part 42.

[0195] Both the fifth sealing part 41 and the sixth sealing part 42 extend along the third direction Z. The dimension of the fifth sealing part 41 along the third direction Z is larger than the dimension of the first receiving part 1135 along the third direction Z, and the dimension of the sixth sealing part 42 along the third direction Z is larger than the dimension of the second receiving part 1145 along the third direction Z. This makes the sealing range of the fifth sealing part 41 and the sixth sealing part 42 on the two adjacent brackets 11 along the third direction Z greater than the width of the gap 20 along the third direction Z, thereby sealing both ends of the gap 20 along the second direction Y, so that both ends of the gap 20 along the second direction Y are completely sealed or the degree of opening of both ends of the gap 20 along the second direction Y is reduced.

[0196] The fifth sealing part 41 and the sixth sealing part 42, which are provided on two adjacent supports 11, can seal and cooperate after the two supports 11 are stacked to block the two ends of the gap 20 along the second direction Y, reducing the risk that other impurities will enter the gap 20 along the two ends of the gap 20 in the second direction Y and block or occupy part of the gap 20. They can also play a positioning role between the two adjacent supports 11, improving the stacking stability of the two adjacent supports 11.

[0197] like Figure 27 As shown, in some embodiments, the fifth sealing part 41 forms a sealing groove, and the sixth sealing part 42 is inserted into the sealing groove; the sealing structure 40 also includes a second sealing member 43, which is located in the sealing groove and seals the gap between the sixth sealing part 42 and the sealing groove.

[0198] If the sealing fit between the fifth sealing part 41 and the sixth sealing part 42 meets the requirements, the sealing structure 40 may not include the second sealing element 43.

[0199] like Figure 29 , Figure 30 As shown, the battery pack 100 also includes two sidewalls 50 along the second direction Y. The two sidewalls 50 are located on both sides of the cell unit 10, and each bracket 11 is connected to the two sidewalls 50.

[0200] The sidewall 50 includes a first region 51, a second region 52, a third region 53, and a fourth region 54. The first region 51 is arranged opposite to one end of the cell unit 10 along the second direction Y. The second region 52, the third region 53, and the fourth region 54 are respectively connected to different edges of the first region 51 and are connected sequentially. The second region 52 and the fourth region 54 are arranged opposite to each other along the third direction Z and are respectively located on both sides of the cell unit 10 along the third direction Z. The second region 52 and the fourth region 54 are connected through the third region 53. The third region 53 is located at one end of the plurality of cell units 10 as a whole along the first direction X. The sidewall 50 has a third opening 55 at the end of the first region 51 away from the third region 53.

[0201] The bracket 11 and the side wall 50 can be connected by welding, screw connection, bolt connection, glue bonding or other connection methods.

[0202] The two sidewalls 50 are located on both sides of the cell unit 10 along the second direction Y, respectively, and can protect the cell unit 10 on both sides of the second direction Y. Each bracket 11 is connected to the two sidewalls 50, which can maintain a relatively stable stacking relationship of multiple cell units 10, thereby enabling the battery pack 100 to form a stable overall structure.

[0203] like Figure 31 , Figure 32 , Figure 33 As shown, in some embodiments, a receiving cavity 60 is formed on the side of the sidewall 50 facing the cell unit 10, and each power output part 121 is received in the receiving cavity 60; the battery pack 100 also includes a third seal 70, which is filled in the receiving cavity 60.

[0204] In an embodiment where power output sections 121 are formed at both opposite ends of the cell 12 along the second direction Y, the two power output sections 121 are distributed and accommodated in a receiving cavity 60 formed between the corresponding sidewall 50 cell units 10.

[0205] The third seal 70 can be filled into the receiving cavity 60, thereby reducing the sealing difficulty and improving the sealing quality. The liquid compound is mechanically or manually poured into the receiving chamber 1152 containing the power output section 121, and then cured at room temperature or under heating conditions to form a high-performance thermosetting third seal 70. The fluidity of the liquid compound allows it to fully diffuse within the receiving chamber 1152 and contact each power output section 121, increasing the contact area between each power output section 121 and the liquid compound, thereby increasing the contact area between the power output section 121 and the third seal 70.

[0206] In other embodiments, the third seal 70 may be sealed within the receiving cavity 60 in other ways.

[0207] The third seal 70 is filled in the cavity 60 of the side wall 50 facing the cell unit 10 to improve the sealing performance between the side wall 50 and the cell unit 10. It can protect the structure located in the cavity 60, reduce the risk of other impurities entering the cavity 60 and then entering the gap 20 from both ends of the gap 20 in the second direction Y, and reduce the risk of other impurities contaminating or damaging the power output section 121.

[0208] Please continue reading Figure 31 , Figure 32 , Figure 33 , Figure 34In some embodiments, the battery pack 100 further includes a circuit board 80, with the power output section 121 electrically connected to the circuit board 80. Along the second direction Y, a fourth seal 90 is filled between each end of the circuit board 80 and the two sidewalls 50. The circuit board 80 is disposed at one end of the plurality of battery cells 10 as a whole along the first direction X, opposite to the third region 53.

[0209] In one embodiment, the circuit board 80 includes a BMS (Battery Management System) component, which includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cell 12.

[0210] Multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some battery cells 10 are connected in series while others are connected in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration to form two opposite polarities: a total positive electrode 100a and a total negative electrode 100b. Both the total positive electrode 100a and the total negative electrode 100b are connected to the circuit board 80, thus forming the positive terminal 100c and the negative terminal 100d of the battery pack 100. The positive terminal 100c and the negative terminal 100d can be electrically connected to electrical devices to supply power to the devices, or they can be electrically connected to charging devices to charge the battery pack 100. The positive terminal 100c and the negative terminal 100d are formed on the side of the circuit board 80 opposite to the battery cells 10.

[0211] The positive terminal 100a and the circuit board 80 can be electrically connected through the first conductor 110, or the positive terminal 100a can be directly electrically connected to the circuit board 80. The negative terminal 100b and the circuit board 80 can be electrically connected through the second conductor 120, or the negative terminal 100b can be directly electrically connected to the circuit board 80. Figure 32 , Figure 33 , Figure 34 The diagram shows a total positive terminal 100a electrically connected to a circuit board 80 via a first conductor 110, and a total negative terminal 100b electrically connected to the circuit board 80 via a second conductor 120. The first conductor 110 and the second conductor 120 are located on at least one side of the circuit board 80 along the second direction Y, and are situated between at least one end of the circuit board 80 along the second direction Y and a sidewall 50, such that the paths of the first conductor 110 and the second conductor 120 are as short as possible. Optionally, the first conductor 110 includes a wire harness. Optionally, the first conductor 110 includes a conductive retrieval element, such as a copper strip. Optionally, the second conductor 120 includes a wire harness. Optionally, the second conductor 120 includes a conductive retrieval element, such as a copper strip.

[0212] The fourth seal 90 can be potted between the circuit board 80 and the sidewall 50, that is, the liquid compound is mechanically or manually poured into the space between the sidewall 50 and the circuit board 80, and cured at room temperature or under heating conditions to form a high-performance thermosetting fourth seal. The fluidity of the liquid compound allows it to diffuse sufficiently between the sidewall 50 and the circuit board 80, covering the connection points of the first conductor 110 and the total positive electrode 100a, as well as the connection points of the second conductor 120 and the total negative electrode 100b. The fourth seal 90 is located at one end of the third seal 70, away from the third region 53 of the sidewall 50 along the first direction X, and is connected to the third seal 70.

[0213] In other embodiments, the fourth seal 90 may also be sealed between the circuit board 80 and the sidewall 50 in other ways.

[0214] The circuit board 80 is filled with a fourth seal 90 between its two ends in the second direction Y and the side wall 50. This seal can protect the connection between the power output section 121 and the circuit board 80, reducing the risk of other impurities entering the space between the side wall 50 and the circuit board 80 and causing the electrical connection between the power output section 121 and the circuit board 80 to fail.

[0215] like Figure 32 , Figure 33 , Figure 35 As shown, in some embodiments, the battery pack 100 further includes a top wall 130 that covers the side of the circuit board 80 away from the cell unit 10 and is connected to the two side walls 50.

[0216] like Figure 32 , Figure 33 As shown, the top wall 130 covers the side of the circuit board 80 facing away from the battery cell unit 10 along the first direction X. The top wall 130 is arranged opposite to the third region 53 of the side wall 50 and covers the third opening 55 of the side wall 50. The top wall 130 and the side wall 50 can be welded together, or connected by bolts, screws, adhesive, etc. The top wall 130 covering the side of the circuit board 80 facing away from the battery cell unit 10 can protect the circuit board 80 and reduce the risk of damage to the circuit board 80 from external forces.

[0217] In some embodiments, cell 12 is a pouch cell.

[0218] The housing 122 of the pouch cell includes an aluminum-plastic film. By accommodating the pouch cell in the bracket 11, and the first support portion 13 of the bracket 11 supporting the adjacent bracket 11, a gap 20 can be formed between the two adjacent brackets 11. The heat generated by the pouch cell during charging and discharging can be transferred through the bracket 11 to the gap 20 between the two adjacent brackets 11. The heat dissipation area is large, the heat transfer path is short, and the thermal resistance is low. The heat generated by the pouch cell can be quickly transferred out through the gap 20, thereby quickly reducing the temperature of the pouch cell and improving the heat dissipation capacity of the battery pack 100.

[0219] This application also provides an electrical device, which includes an electrical power source and a battery pack 100 provided in any of the above embodiments. The electrical device includes, but is not limited to, energy storage systems, electric vehicles, power tools, and drones. The battery pack 100 provides electrical energy to the electrical power source. The battery pack 100 provided in any of the above embodiments has good heat dissipation capabilities and high heat dissipation efficiency, thereby improving the safety performance of the battery pack 100 and enhancing the electrical safety of the electrical device.

[0220] The above are merely preferred embodiments 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, The battery cell includes multiple battery cell units, which are stacked along a first direction. Each battery cell unit includes: The bracket is equipped with a first support section; The battery cell is housed within the support frame, and at least one end of the battery cell unit along the second direction forms an energy output section. The first support portion is configured to support an adjacent bracket along the first direction, thereby forming a gap between the two adjacent brackets. The bracket includes a first portion and a second portion, which are arranged along the first direction and together define an accommodating space. The battery cell is housed within the accommodating space. One of the first portion and the second portion is provided with the first support portion. A first channel for the power output portion to pass through is formed between the first portion and the second portion. The second direction is perpendicular to the first direction. The battery pack also includes a first sealing element configured to seal the first channel. The power output section includes a main body and a bend in the main body along a third direction; The first channel includes a first space and receiving chambers disposed at both ends of the first space along the third direction. The receiving chambers are connected to the first space. The main body is received in the first space, and the corner portion is received in the receiving chamber. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery pack according to claim 1, characterized in that, The bracket is further provided with a second support portion. Along the first direction, the second support portion and the first support portion are respectively provided on both sides of the bracket, and the second support portion is configured to cooperate with the first support portion of the adjacent bracket.

3. The battery pack according to claim 2, characterized in that, The first part is provided with a first fixing part, and the second part is provided with a second fixing part, and the first fixing part and the second fixing part are fixedly engaged along the first direction; Along the first direction, the first fixing part and the first supporting part are respectively disposed on both sides of the first part, and the second fixing part and the second supporting part are respectively disposed on both sides of the second part.

4. The battery pack according to claim 1, characterized in that, The first part includes a first straight part and a first bent part, and the second part includes a second straight part and a second bent part. Along the third direction, the second bent part is connected to the second straight part. The first straight portion and the second straight portion are arranged opposite to each other along the first direction to form the first space, and the first bent portion and the second bent portion form the receiving chamber.

5. The battery pack according to claim 4, characterized in that, The first straight portion is provided with a first limiting groove extending along the third direction, and a portion of the first sealing member is accommodated in the first limiting groove; and / or, the second straight portion is provided with a second limiting groove extending along the third direction, and a portion of the first sealing member is accommodated in the second limiting groove.

6. The battery pack according to claim 1, characterized in that, Two adjacent battery cells are provided with two sealing structures. Along the second direction, the two sealing structures are respectively provided at both ends of the bracket to seal the gap at both ends along the second direction.

7. The battery pack according to claim 6, characterized in that, The sealing structure includes a fifth sealing part and a sixth sealing part. Along the first direction, the fifth sealing part and the sixth sealing part are respectively disposed on two adjacent brackets, and the fifth sealing part and the sixth sealing part are sealed together.

8. The battery pack according to claim 1, characterized in that, The power output section is formed at both ends of the battery cell unit along the second direction; The battery pack also includes two sidewalls, which are located on both sides of the cell unit along the second direction, and each bracket is connected to the two sidewalls. A receiving cavity is formed on the side of the sidewall facing the battery cell unit, and each of the power output parts is received in the receiving cavity; The battery pack also includes a third seal that fills the receiving cavity.

9. The battery pack according to claim 1, characterized in that, The battery cell includes a housing, an electrode assembly, and electrode terminals connected to the electrode assembly and extending from the housing; The housing includes a main body and an extension portion extending outward from the main body, the electrode assembly is housed within the main body, and the electrode terminals extend from the extension portion.

10. The battery pack according to claim 9, characterized in that, The battery cell unit also includes an insulating component, which is sleeved on the outer periphery of the main body.

11. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-10.

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