Battery pack and electric device

Abstract

A battery pack and an electric device. The battery pack comprises a case (2), a battery cell assembly (1), a plurality of busbar assemblies (3) and a sampling assembly (4). The battery cell assembly (1) is housed in the case (2), and the battery cell assembly (1) comprises a plurality of battery cells (11) arranged in a first direction. Each battery cell (11) comprises a first electrical connection end and a second electrical connection end that are arranged opposite each other in the first direction. Each busbar assembly (3) is connected to adjacent battery cells (11). Each busbar assembly (3) comprises a first busbar (31) and a second busbar (32). For two adjacent battery cells (11), a first busbar (31) is connected to the first electrical connection end of one battery cell (11), and a second busbar (32) is connected to the second electrical connection end of the other battery cell (11). The sampling assembly (4) comprises a base (41) and a plurality of conductive parts (42), wherein the plurality of conductive parts (42) are spaced apart on the base (41) in the first direction, and each conductive part (42) is connected to the first busbar (31) and the second busbar (32) of a corresponding busbar assembly (3).

Description

Battery packs and powered devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 4, 2024, with application number 202410160199.8 and invention name “Battery Pack and Electrical Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0003] Rechargeable batteries are batteries that can be recharged after discharge to activate the active materials and continue to be used. Rechargeable batteries are widely used in electronic devices such as mobile phones, laptops, and drones.

[0004] Battery packs typically include multiple cells to meet the voltage requirements of electronic devices. Improving the current capacity of battery packs has been a key research topic in the battery technology industry. Summary of the Invention

[0005] The present application provides a battery pack and an electrical device, which can improve the overcurrent capability of the battery pack.

[0006] In a first aspect, the present application provides a battery pack comprising a shell, a battery cell assembly, a plurality of bus assemblies and a sampling assembly. The battery cell assembly is housed in the shell, and the battery cell assembly comprises a plurality of battery cells arranged along a first direction. Each battery cell comprises a first electrical connection end and a second electrical connection end arranged opposite to each other in the first direction. Each group of bus assemblies connects adjacent battery cells. The bus assembly comprises a first bus and a second bus. In two adjacent battery cells, the first bus is connected to the first electrical connection end of one battery cell, and the second bus is connected to the second electrical connection end of the other battery cell. The sampling assembly comprises a base and a plurality of conductive parts, and the plurality of conductive parts are spaced apart on the base along the first direction. Each conductive part is connected to the first bus and the second bus of each group of bus assemblies.

[0007] The first busbar and the second busbar are connected to realize the series connection of two adjacent battery cells, thereby reducing the heat generated by the battery pack during the charging and discharging process and improving the overcurrent capacity of the battery pack.

[0008] In one or more optional embodiments above, the battery cell includes a battery cell shell, the battery cell shell includes a bottom wall, the bottom wall and the second electrical connection end are arranged opposite to each other in the first direction, and the bottom wall is the first electrical connection end.

[0009] In one or more of the above optional embodiments, the battery pack includes a bracket housed within the housing, the bracket including a first bracket and a second bracket arranged along a second direction, the second direction being perpendicular to the first direction. In the second direction, the cell assembly is arranged between the first bracket and the second bracket, and the conductive portion is arranged on a side of the second bracket facing away from the cell assembly. The second bracket defines a first bracket opening, and the first busbar and the second busbar pass through the first bracket opening and are connected to the conductive portion.

[0010] The first bracket opening is provided to facilitate the first busbar and the second busbar to pass through the second bracket, thereby achieving connection between the conductive portion, the first busbar and the second busbar.

[0011] In one or more optional embodiments above, the second bracket is provided with a first recess, at least a portion of the base is accommodated in the first recess, and the opening of the first bracket passes through the first recess.

[0012] The first recess can provide a space for the base, thereby improving space utilization and reducing the risk of interference between the base and other components. When installing the sampling component, the first recess can play a positioning role, facilitating the assembly of the sampling component.

[0013] In one or more of the above optional embodiments, the battery cell includes a battery cell housing. The second bracket has a second bracket opening. The sampling assembly includes a sampling portion connected to the base, the sampling portion passing through the second bracket opening and connected to one of the battery cell housings. The provision of the second bracket opening facilitates direct connection of the sampling portion to the battery cell, thereby improving sampling accuracy of the sampling portion.

[0014] In one or more optional embodiments above, the first busbar includes a first main body, a first extension and a first connection portion, and the first extension portion is located between adjacent battery cells. The second busbar includes a second main body, a second extension and a second connection portion, and the second extension portion is located between adjacent battery cells. In two adjacent battery cells, the first extension portion is connected to the first electrical connection end of one battery cell, and the second extension portion is connected to the second electrical connection end of the other battery cell. In the first direction, the second main body and the first main body are arranged in an array, and the first connection portion and the second connection portion are connected to the conductive portion. Along the first direction, the projection of the first extension portion and the projection of the second extension portion are separated, which can reduce the risk of interference between the connection between the first extension portion and the first electrical connection end and the connection between the second extension portion and the second electrical connection end.

[0015] In one or more of the above optional embodiments, the first extension portion includes a first portion, a second portion, and a first protrusion. The first portion is connected to the first main portion, and the first portion is located away from the first electrical connection end relative to the first main portion. The second portion is connected to the first portion; along a second direction, the projection of the second portion overlaps with the projection of the second main portion, and the second direction is perpendicular to the first direction. The first protrusion is connected to the second portion, and the first protrusion protrudes toward and is connected to the first electrical connection end.

[0016] The first protrusion is configured to protrude, reducing the gap between the first protrusion and the first electrical connection terminal when assembling the battery cell and the first busbar, thereby improving the connection strength between the first extension and the first electrical connection terminal. By bending the first portion, the second portion and the second main body share space in the first direction, thereby improving space utilization and reducing the space waste caused by the provision of the first protrusion. When the battery pack is subjected to external forces, the bent first portion can elastically deform, thereby relieving stress and reducing the risk of failure in the connection between the first protrusion and the first electrical connection terminal.

[0017] In one or more optional embodiments above, the second main body and the second extension constitute a first space, and the second portion is located in the first space, which is beneficial to reducing the space occupied by the first extension and the second extension in the first direction.

[0018] In one or more of the above optional embodiments, the battery pack includes a first insulating member, at least a portion of which is disposed between adjacent battery cells. The battery cells include battery housings, which include first electrical connection terminals. In a first direction, at least a portion of the first insulating member is disposed between the battery housing and the second main body of one of the battery cells, wherein the battery cell is connected to the second busbar. The first insulating member can separate the second main body from the battery housing, reducing the risk of a short circuit between the second busbar and the battery housing of the same battery cell.

[0019] In one or more of the above optional embodiments, the battery pack includes a circuit board assembly and a first conductive member, wherein the battery cell assembly and the circuit board assembly are arranged along a first direction. One end of the first conductive member is connected to the battery cell closest to the circuit board assembly, and the other end extends out of the bracket and is connected to the circuit board assembly.

[0020] In one or more of the above optional embodiments, the first conductive member is configured to transmit power of the battery cell assembly.

[0021] In one or more optional embodiments above, the battery pack includes a second conductive member, the second conductive member includes a first conductive segment, a second conductive segment and a third conductive segment, the first conductive segment is arranged outside the bracket, the second conductive segment is connected to the circuit board assembly, and the third conductive segment passes through the first bracket and is connected to the battery cell farthest from the circuit board assembly.

[0022] In one or more of the above optional embodiments, the second conductive member is configured to transmit power of the battery cell assembly.

[0023] In one or more optional embodiments above, along the second direction, the first conductive segment and the sampling assembly are disposed on opposite sides of the bracket. The bracket separates the first conductive segment and the sampling assembly to reduce mutual interference.

[0024] In one or more optional embodiments above, the conductive portion is located on a side of the base away from the battery cell assembly. The base is provided with a first opening, and the first busbar and the second busbar pass through the first opening and are connected to the conductive portion.

[0025] In one or more of the above optional embodiments, the sampling component is configured to transmit the electrical signal of the battery cell component.

[0026] In one or more of the above optional embodiments, the battery pack includes a bracket housed within the housing, and the cell assembly is disposed within the bracket. The bracket includes a third bracket opening, and the battery pack includes an adhesive, at least a portion of which is disposed within the third bracket opening. The adhesive bonds the cell assembly, bracket, and housing together, thereby improving the overall strength of the battery pack. When the battery pack is subjected to external forces, the adhesive can limit movement of the cell assembly within the housing, thereby improving the stability of the cell assembly. In one or more of the above optional embodiments, the cell assembly is bonded to the first bracket and / or the second bracket.

[0027] In one or more optional embodiments above, the housing includes a first housing opening configured to allow insulating material to flow into the housing through the first housing opening and into the bracket through the third bracket opening, and the insulating material solidifies to form an adhesive member.

[0028] In one or more of the above optional embodiments, the battery cell is a cylindrical battery cell.

[0029] In one or more optional embodiments above, the circuit board assembly includes a first circuit board, and the sampling assembly and the first conductive member are both connected to the first circuit board.

[0030] In one or more of the above optional embodiments, the circuit board assembly includes a second circuit board, and the second conductive member is connected to the second circuit board.

[0031] In a second aspect, the present application provides an electrical device comprising a battery pack according to any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0033] FIG1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0034] FIG2 is a schematic cross-sectional view of the battery pack shown in FIG1 ;

[0035] FIG3 is a schematic diagram of an explosion of the battery pack shown in FIG1 ;

[0036] FIG4 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0037] FIG5 is a schematic diagram of the battery cell shown in FIG4 after being connected to the first busbar;

[0038] FIG6 is a schematic diagram of the battery cell shown in FIG4 after being connected to the second busbar;

[0039] FIG7 is a schematic structural diagram of a busbar assembly provided in some embodiments of the present application;

[0040] FIG8 is a schematic structural diagram of the first bus shown in FIG7 ;

[0041] FIG9 is a schematic structural diagram of the second bus shown in FIG7 ;

[0042] FIG10 is a schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application;

[0043] FIG11 is an enlarged schematic diagram of the circle frame of FIG10;

[0044] FIG12 is an enlarged schematic diagram of block A in FIG2 ;

[0045] FIG13 is a schematic structural diagram of a second bracket provided in some embodiments of the present application;

[0046] FIG14 is a schematic diagram of a first bracket and a second conductive member according to some embodiments of the present application;

[0047] FIG15 is an enlarged schematic diagram of FIG2 at the circle B;

[0048] FIG16 is another schematic diagram of a partial structure of a battery pack provided by some embodiments of the present application;

[0049] FIG17 is an enlarged schematic diagram of the circle frame of FIG16;

[0050] FIG18 is an enlarged schematic diagram of the circle C in FIG2 .

[0051] The reference numerals for the specific embodiments are as follows: DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0054] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-90°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

[0055] The first direction includes the first direction and the direction opposite to the first direction. The second direction includes the second direction and the direction opposite to the second direction. The third direction includes the third direction and the direction opposite to the third direction.

[0056] 1 to 18 , an embodiment of the present application provides a battery pack including a housing 2 and a cell assembly 1 accommodated in the housing 2 .

[0057] The battery cell assembly 1 includes a plurality of battery cells 11. The battery cells 11 can be lithium-ion battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, magnesium-ion battery cells or other types of battery cells.

[0058] The battery cell 11 can be a hard-shell battery cell or a soft-pack battery cell. Optionally, the battery cell 11 is a hard-shell battery cell.

[0059] The battery cell 11 can be a square battery cell, a cylindrical battery cell or other special-shaped battery cells. Optionally, the battery cell is a cylindrical battery cell, for example, the battery cell can be a 21700 battery cell, a 18650 battery cell, a 46800 battery cell, a 49480 battery cell or other types of cylindrical battery cells.

[0060] In some embodiments, the multiple battery cells 11 may be connected in series, in parallel, or in hybrid connection. Hybrid connection means that the multiple battery cells 11 are connected in both series and parallel connection. Optionally, the multiple battery cells 11 of the battery cell assembly 1 are connected in series.

[0061] In some embodiments, the housing 2 may be a square housing, a cylindrical housing, or a housing of other shapes.

[0062] The housing 2 may be a metal housing, a plastic housing, a metal-plastic composite housing, or a housing made of other materials.

[0063] The housing 2 may be an integrally formed housing, or may be a housing formed by splicing together a plurality of independently formed parts.

[0064] In some embodiments, the housing 2 is a metal housing, which has relatively high strength.

[0065] In some embodiments, the plurality of battery cells 11 are arranged along a first direction Z. Optionally, referring to FIG3 , the plurality of battery cells 11 form a column structure along the first direction Z. Optionally, the plurality of battery cells 11 form a multi-column structure along the first direction Z. For example, the battery cell assembly 1 includes 10 battery cells 11, of which 5 battery cells form a column structure along the first direction Z, and 5 battery cells form another column structure along the first direction Z.

[0066] In some embodiments, each battery cell 11 includes a first electrical connection end and a second electrical connection end that are oppositely arranged along a first direction Z. Optionally, the polarities of the first electrical connection end and the second electrical connection end are opposite, that is, one of the first electrical connection end and the second electrical connection end is a positive electrical connection end, and the other of the first electrical connection end and the second electrical connection end is a negative electrical connection end.

[0067] In some embodiments, the battery cell 11 includes a battery cell case 111 and an electrode terminal 112 .

[0068] In some embodiments, the battery cell 11 includes two electrode terminals 112 , which are respectively disposed at both ends of the battery cell housing 111 along the first direction Z. Optionally, one of the electrode terminals 112 serves as a first electrical connection end, and the other electrode terminal 112 serves as a second electrical connection end.

[0069] In some embodiments, the battery cell 11 includes an electrode assembly 113 housed in a battery cell housing 111. The electrode assembly 113 includes a positive electrode sheet and a negative electrode sheet. During the charge and discharge process of the battery cell 11, active ions (e.g., lithium ions) are intercalated and released back and forth between the positive electrode sheet and the negative electrode sheet.

[0070] In some embodiments, the electrode assembly 113 includes a separator disposed between the positive electrode sheet and the negative electrode sheet. The separator separates the positive electrode sheet and the negative electrode sheet to provide insulation between the positive electrode sheet and the negative electrode sheet. The separator can reduce the risk of short circuit between the positive and negative electrode sheets while allowing active ions to pass through.

[0071] In some embodiments, one of the positive electrode sheet and the negative electrode sheet is electrically connected to the first electrical connection end, and the other is electrically connected to the second electrical connection end.

[0072] Exemplarily, the cell casing 111 is the first electrical connection end, the electrode terminal 112 is the second electrical connection end, the positive electrode tab is electrically connected to the electrode terminal 112, and the negative electrode tab is electrically connected to the cell casing 111. In this case, the electrode terminal 112 can serve as the positive electrode of the cell 11, and the cell casing 111 can serve as the negative electrode of the cell 11. Alternatively, the positive electrode tab is electrically connected to the cell casing 111, and the negative electrode tab is electrically connected to the electrode terminal 112. In this case, the electrode terminal 112 can serve as the negative electrode of the cell 11, and the cell casing 111 can serve as the positive electrode of the cell 11.

[0073] In some embodiments, the cell housing 111 is used to encapsulate the electrode assembly 113 and components such as the electrolyte. The cell housing 111 can be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), or other conductive housings.

[0074] In other embodiments, the cell housing 111 comprises metal, the cell housing 111 serves as a first electrical connection terminal, and the electrode terminal 112 serves as a second electrical connection terminal.

[0075] In some embodiments, the cell housing 111 includes a bottom wall 1111 , and the bottom wall 1111 and the electrode terminal 112 are disposed opposite to each other in the first direction Z.

[0076] In some embodiments, the bottom wall 1111 serves as the first electrical connection end, eliminating the need for a traditional electrode terminal and simplifying the structure of the battery cell 11 .

[0077] In some embodiments, two adjacent battery cells 11 are connected in series along the first direction Z. For example, in two adjacent battery cells 11, the bottom wall 1111 and the electrode terminal 112 of each battery cell 11 are arranged opposite to each other along the first direction Z; the electrode terminal 112 of one battery cell 11 abuts against the bottom wall 1111 of the other battery cell 11 along the first direction Z, so that the two battery cells 11 are connected in series.

[0078] In some embodiments, two adjacent battery cells 11 along the first direction Z are connected in parallel. Alternatively, the bottom walls 1111 of the two battery cells 11 are opposite and connected, so that the two battery cells 11 are connected in parallel; or the electrode terminals 112 of the two battery cells 11 are opposite and connected, so that the two battery cells 11 are connected in parallel.

[0079] In some embodiments, the electrode terminal 112 can be connected to the cell case 111. For example, the battery cell 11 includes a second insulating member 115, at least a portion of which is located between the electrode terminal 112 and the cell case 111, and separates the electrode terminal 112 from the cell case 111, thereby isolating the electrode terminal 112 from the cell case 111 and reducing the risk of short circuits.

[0080] In some embodiments, the battery cell 11 includes a pressure relief portion 114 disposed on the battery cell housing 111. When an abnormality occurs in the battery cell 11, the pressure relief portion 114 activates and forms a pressure relief vent, allowing the contents of the battery cell 11 to be discharged to the outside of the battery cell 11 through the pressure relief vent, thereby reducing the risk of explosion of the battery cell 11. Optionally, the pressure relief portion 114 is disposed on the bottom wall 1111.

[0081] In some examples, the pressure relief portion 114 is integrally formed with the cell housing 111. In alternative examples, the pressure relief portion 114 and the cell housing 111 are formed independently and connected by bonding, welding, or other processes. Optionally, the pressure relief portion 114 may include a pressure relief valve.

[0082] In some embodiments, welding includes, but is not limited to, laser welding, ultrasonic welding, and resistance welding.

[0083] In some embodiments, the pressure relief portion 114 may be a pressure-sensitive or temperature-sensitive element. When the internal pressure or temperature of the battery cell 11 reaches a threshold, the pressure relief portion 114 is activated or a weak structure in the pressure relief portion 114 is destroyed, thereby forming a pressure relief port for the internal pressure or temperature to be released.

[0084] In some embodiments, the battery pack includes multiple busbar assemblies 3 , each busbar assembly 3 connecting adjacent battery cells 11 .

[0085] The busbar assembly 3 can connect two adjacent battery cells 11 in series or in parallel. Optionally, in two adjacent battery cells 11, the battery cell housing 111 and the electrode terminal 112 of each battery cell 11 are arranged relative to each other along the first direction Z; the busbar assembly 3 is connected to the electrode terminal 112 of one battery cell 11, and the busbar assembly 3 is connected to the battery cell housing 111 of the other battery cell 11, so that the two adjacent battery cells 11 are connected in series.

[0086] In some embodiments, the battery pack includes multiple busbar assemblies 3 arranged along a first direction Z, with one busbar assembly 3 connecting two adjacent battery cells 11. Optionally, the multiple busbar assemblies 3 connect multiple battery cells 11 of the battery cell assembly 1 in series.

[0087] In some embodiments, the busbar assembly 3 includes a first busbar 31 and a second busbar 32. In two adjacent battery cells 11, the first busbar 31 is connected to the first electrical connection end of one battery cell 11, and the second busbar 32 is connected to the second electrical connection end of the other battery cell 11.

[0088] Illustratively, in two adjacent battery cells 11 , the first busbar 31 is connected to the bottom wall 1111 of one battery cell 11 , and the second busbar 32 is connected to the electrode terminal 112 of the other battery cell 11 .

[0089] The first busbar 31 may be connected to the bottom wall 1111 by welding, bonding, clamping or other means, and the second busbar 32 may be connected to the electrode terminal 112 by welding, bonding, clamping or other means.

[0090] In some embodiments, the battery pack includes a sampling assembly 4 . The sampling assembly 4 includes a base 41 and a plurality of conductive portions 42 . The plurality of conductive portions 42 are spaced apart from each other along a first direction Z on the base 41 . Each conductive portion 42 connects the first bus 31 and the second bus 32 of each bus assembly 3 .

[0091] Optionally, the number of the conductive portions 42 is the same as the number of the busbar assemblies 3 , and the conductive portions 42 and the busbar assemblies 3 are arranged in a one-to-one correspondence.

[0092] In an embodiment of the present application, the first bus 31 and the second bus 32 are connected, thereby conducting the first electrical connection end of one battery cell 11 with the second electrical connection end of an adjacent battery cell 11, realizing the series connection of two adjacent battery cells 11, reducing the heat generated by the battery pack during the charging and discharging process, and improving the overcurrent capacity of the battery pack.

[0093] In some embodiments, the sampling component 4 is configured to transmit an electrical signal of the battery cell assembly 1. For example, the electrical signal may include at least one of a voltage signal, a current signal, and a temperature signal.

[0094] The sampling component 4 can be connected to the first bus bar 31 and the second bus bar 32 to transmit the electrical signal of the battery cell assembly 1, thereby simplifying the structure of the battery pack.

[0095] In some embodiments, the battery pack includes a bracket 5 housed in the housing 2. Exemplarily, the bracket 5 can be used to support the battery cell assembly 1.

[0096] In some embodiments, the bracket 5 has an inner cavity, and the battery cell assembly 1 can be disposed in the inner cavity of the bracket 5 .

[0097] In some embodiments, the bracket 5 includes a first bracket 51 and a second bracket 52 arranged along a second direction Y, and the second direction Y is perpendicular to the first direction Z. In the second direction Y, the battery cell assembly 1 is arranged between the first bracket 51 and the second bracket 52 .

[0098] For example, the first bracket 51 and the second bracket 52 can clamp the battery cell assembly 1 from both sides. When the battery pack is subjected to external force, the first bracket 51 and the second bracket 52 can limit the movement of the battery cell assembly 1 in the shell 2, thereby improving the stability of the connection between the first bus 31, the second bus 32, the conductive part 42 and the battery cell 11, reducing the risk of short circuit, and improving the stability and reliability of the battery pack.

[0099] In some embodiments, the first bracket 51 is connected to the second bracket 52. For example, the first bracket 51 is connected to the second bracket 52 by snap connection, fastener connection, bonding or other methods.

[0100] In some embodiments, the battery cell 11 is a cylindrical battery cell, and the first bracket 51 and the second bracket 52 both include arc-shaped walls that can cooperate with the arc-shaped surface of the cylindrical battery cell.

[0101] In some embodiments, the first bracket 51 and the second bracket 52 are both insulating brackets. The first bracket 51 and the second bracket 52 can separate the battery cell assembly 1 from the shell 2, thereby reducing the risk of short circuit.

[0102] In some embodiments, the sampling assembly 4 is located on a side of the second bracket 52 facing away from the battery cell assembly 1 . The second bracket 52 defines a first bracket opening 521 , through which the busbar assembly 3 passes and is connected to the sampling assembly 4 .

[0103] In some embodiments, the conductive portion 42 is disposed on a side of the second bracket 52 facing away from the battery cell assembly 1 . The second bracket 52 defines a first bracket opening 521 , through which the first busbar 31 and the second busbar 32 pass and connect to the conductive portion 42 .

[0104] The first bracket opening 521 is provided to facilitate the first busbar 31 and the second busbar 32 to pass through the second bracket 52 , thereby achieving connection among the conductive portion 42 , the first busbar 31 and the second busbar 32 .

[0105] In some embodiments, there are multiple first bracket openings 521 , and the multiple first bracket openings 521 are spaced apart along the first direction Z. The first busbar 31 and the second busbar 32 of a busbar assembly 3 pass through the same first bracket opening 521 .

[0106] Optionally, the number of the first bracket openings 521 is the same as the number of the busbar assemblies 3 , and the first bracket openings 521 and the busbar assemblies 3 are arranged in a one-to-one correspondence.

[0107] In some embodiments, the second bracket 52 is provided with a first recess 522 . At least a portion of the base 41 is received in the first recess 522 , and the first bracket opening 521 passes through the first recess 522 .

[0108] The first recess 522 can provide a space for the base 41, thereby improving space utilization and reducing the risk of interference between the base 41 and other components. When installing the sampling assembly 4, the first recess 522 can play a positioning role, facilitating the assembly of the sampling assembly 4.

[0109] In some embodiments, a first recess 522 is defined on a side of the second bracket 52 facing away from the battery cell assembly 1 .

[0110] In some embodiments, the second bracket 52 is provided with a second bracket opening 523. The sampling assembly 4 includes a sampling portion 43 connected to the base 41. The sampling portion 43 passes through the second bracket opening 523 and is connected to the cell housing 111 of a cell 11 in the cell assembly 1. The provision of the second bracket opening 523 facilitates direct connection of the sampling portion 43 to the cell 11, thereby improving the accuracy of sampling by the sampling portion 43.

[0111] The number of sampling units 43 may be one or more.

[0112] The sampling unit 43 may be used to collect information of the battery cell 11 , such as temperature.

[0113] In some embodiments, the sampling unit 43 is used to collect the temperature of the battery cell 11 .

[0114] In some embodiments, the sampling portion 43 is attached to the cell housing 111 of the cell 11 to improve the accuracy of temperature collection. Optionally, the sampling portion 43 is bonded to the cell housing 111 of the cell 11 by thermally conductive adhesive.

[0115] In some embodiments, the sampling unit 43 includes an NTC (Negative Temperature Coefficient) temperature sensor.

[0116] In some embodiments, there are multiple second bracket openings 523 and multiple sampling portions 43 . The multiple second bracket openings 523 are spaced apart along the first direction Z, and the multiple sampling portions 43 are spaced apart along the first direction Z.

[0117] Optionally, the number of the second bracket openings 523 and the number of the sampling portions 43 are the same, and the second bracket openings 523 and the sampling portions 43 are arranged in a one-to-one correspondence.

[0118] In some embodiments, the base 41 can collect the voltage of the battery cell 11 through the conductive portion 42 .

[0119] In some embodiments, the base 41 may include a circuit board. Optionally, the circuit board includes a printed circuit board (PCB). Optionally, the circuit board includes a flexible printed circuit board (FPC).

[0120] The plurality of conductive parts 42 and the plurality of sampling parts 43 are connected to the circuit board.

[0121] In some embodiments, the conductive portion 42 includes a metal sheet.

[0122] In some embodiments, the battery pack includes a third insulating member 44 , which is disposed between the base 41 and the housing 2 ; the third insulating member 44 is connected to the base 41 and covers the plurality of conductive portions 42 .

[0123] The third insulating member 44 can separate the conductive portion 42 , the first busbar 31 , and the second busbar 32 from the housing 2 to reduce the risk of short circuit.

[0124] In some embodiments, the conductive portion 42 is located on a side of the base 41 away from the battery cell assembly 1. The base 41 is provided with a first opening 411. The first busbar 31 and the second busbar 32 pass through the first opening 411 and connect to the conductive portion 42. The first opening 411 facilitates the passage of the first busbar 31 and the second busbar 32 through the base 41, thereby achieving a connection between the conductive portion 42, the first busbar 31, and the second busbar 32.

[0125] In some embodiments, the first opening 411 and the first bracket opening 521 are arranged along the second direction Y, and the first busbar 31 and the second busbar 32 pass through the first bracket opening 521 and the first opening 411 in sequence along the second direction Y.

[0126] In some embodiments, there are multiple first openings 411 , and the number of the first openings 411 is the same as the number of the first opening brackets 521 . The multiple first openings 411 and the multiple first bracket openings 521 are arranged in a one-to-one correspondence.

[0127] In some embodiments, the battery cell assembly 1 is bonded to the first bracket 51 and / or the second bracket 52 .

[0128] Adhere the battery cell assembly 1 to at least one of the first bracket 51 and the second bracket 52, which can limit the movement of the battery cell assembly 1 in the shell 2 when the battery pack is subjected to external force, thereby improving the stability of the connection between the first bus 31, the second bus 32, the conductive part 42 and the battery cell 11, reducing the risk of short circuit, and improving the stability and reliability of the battery pack.

[0129] In some embodiments, a colloid may be applied to the side of the first bracket 51 facing the battery cell assembly 1, and the colloid adheres the battery cell assembly 1 to the first bracket 51. Optionally, each battery cell 11 is adhered to the first bracket 51 by the colloid.

[0130] In some embodiments, a colloid may be applied to the side of the second bracket 52 facing the battery cell assembly 1, and the colloid adheres the battery cell assembly 1 to the second bracket 52. Optionally, each battery cell 11 is adhered to the second bracket 52 by the colloid.

[0131] In some embodiments, the first busbar 31 includes a first main portion 311, a first extension portion 312, and a first connection portion 313. The first extension portion 312 is located between adjacent battery cells 11. In two adjacent battery cells 11, the first extension portion 312 is connected to the first electrical connection end of one of the battery cells 11. Exemplarily, the first extension portion 312 is connected to the bottom wall 1111 of one of the battery cells 11.

[0132] In some embodiments, the first extending portion 312 and the first connecting portion 313 are connected to the first main body portion 311 .

[0133] Exemplarily, the first extending portion 312 and the first connecting portion 313 are respectively connected to two sides of the first main body portion 311 .

[0134] For example, the first extension portion 312 may be welded to the bottom wall 1111 of the battery cell 11 , such as by laser welding.

[0135] In some embodiments, the second busbar 32 includes a second main portion 321 , a second extending portion 322 , and a second connecting portion 323 . The second extending portion 322 is located between adjacent battery cells 11 .

[0136] In two adjacent battery cells 11, the first extension portion 312 is connected to the first electrical connection end of one battery cell 11, and the second extension portion 322 is connected to the second electrical connection end of the other battery cell 11. Exemplarily, in two adjacent battery cells 11, the bottom wall 1111 of each battery cell 11 is the first electrical connection end, and the electrode terminal 112 is the second electrical connection end. The first extension portion 312 is connected to the bottom wall 1111 of one battery cell 11, and the second extension portion 322 is connected to the electrode terminal 112 of the other battery cell 11.

[0137] In some embodiments, the second extending portion 322 and the second connecting portion 323 are connected to the second main body portion 321 .

[0138] Exemplarily, the second extending portion 322 and the second connecting portion 323 are respectively connected to two sides of the second main body portion 321 .

[0139] For example, the second extension portion 322 may be welded to the electrode terminal 112 of the battery cell 11 , such as by laser welding.

[0140] In some embodiments, the second body portion 321 and the first body portion 311 are arranged side by side in the first direction Z. In the first direction Z, the second body portion 321 and the first body portion 311 may completely overlap each other or only partially overlap each other.

[0141] In some embodiments, the second main body portion 321 and the first main body portion 311 are in contact and connected in the first direction Z, or they may be bonded together using a colloid or the like. Optionally, the second main body portion 321 and the first main body portion 311 are in contact and connected along the first direction Z. This saves space in the first direction Z, increases the contact area between the first busbar 31 and the second busbar 32, and improves the flow capacity between the first busbar 31 and the second busbar 32.

[0142] In some embodiments, the first connection portion 313 and the second connection portion 323 are connected to the conductive portion 42. Alternatively, the first connection portion 313, the second connection portion 323, and the conductive portion 42 are in contact with each other. Alternatively, the second connection portion 323, the first connection portion 313, and the conductive portion 42 are stacked and laser welded.

[0143] In some embodiments, along the first direction Z, the projection of the first extension portion 312 and the projection of the second extension portion 322 are separated, which can reduce the risk of interference between the connection between the first extension portion 312 and the first electrical connection end and the connection between the second extension portion 322 and the second electrical connection end.

[0144] Exemplarily, when viewed along the first direction Z, the first extension portion 312 and the second extension portion 322 do not overlap.

[0145] In some embodiments, the first connection portion 313 is folded from one end of the first main body portion 311 along the second direction Y to the side of the conductive portion 42 away from the base 41 and is connected to the conductive portion 42, and the second connection portion 323 is folded from one end of the second main body portion 321 along the second direction Y to the side of the first connection portion 313 away from the conductive portion 42 and is connected to the first connection portion 313.

[0146] In some embodiments, the second connection portion 323 , the first connection portion 313 , and the conductive portion 42 are welded.

[0147] In some embodiments, the first extension portion 312 includes a first portion 3121, the first portion 3121 being connected to the first main portion 311, and the first portion 3121 being spaced apart from the first electrical connection end of the battery cell 11 connected to the first extension portion 312 relative to the first main portion 311. Exemplarily, the bottom wall 1111 of the battery cell 11 serves as the first electrical connection end, and the first portion 3121 is spaced apart from the bottom wall 1111 of one of the two adjacent battery cells 11, the battery cell 11 being the battery cell 11 connected to the first extension portion 312, relative to the first main portion 311.

[0148] In some embodiments, the first extension portion 312 includes a second portion 3122, which is connected to the first portion 3121. Along the second direction Y, the projection of the second portion 3122 overlaps with the projection of the second main portion 321, thereby reducing the space occupied by the bus assembly 3 in the first direction Z.

[0149] In some embodiments, the first extension portion 312 includes a first protrusion 3123, the first protrusion 3123 being connected to the second portion 3122. The first protrusion 3123 protrudes toward and is connected to the first electrical connection end of the battery cell 11 connected to the first extension portion 312. Exemplarily, the first protrusion 3123 is connected to the bottom wall 1111 of the battery cell 11 connected to the first extension portion 312 of two adjacent battery cells 11.

[0150] The first protrusion 3123 is positioned protrudingly. This reduces the gap between the first protrusion 3123 and the first electrical connection terminal when assembling the battery cell 11 and the first busbar 31, thereby improving the connection strength between the first extension 312 and the first electrical connection terminal. By bending the first portion 3121, the second portion 3122 and the second main body 321 share space in the first direction Z, thereby improving space utilization and reducing the space wasted by the first protrusion 3123. When the battery pack is subjected to external forces, the bent first portion 3121 elastically deforms, thereby relieving stress and reducing the risk of failure in the connection between the first protrusion 3123 and the first electrical connection terminal.

[0151] In some embodiments, the first protrusion 3123 is welded to the bottom wall 1111. By welding the first protrusion 3123 to the bottom wall 1111, the risk of cold welding can be reduced.

[0152] In some embodiments, there are multiple first extension portions 312 . Optionally, the multiple first extension portions 312 are arranged along the circumference of the battery cell 11 .

[0153] In some embodiments, two opposite surfaces of the second portion 3122 along the first direction Z are flush with two opposite surfaces of the second main body portion 321 along the first direction Z, respectively.

[0154] In some embodiments, the second main portion 321 and the second extension portion 322 form a first space 32 a , and the second portion 3122 is located in the first space 32 a , which helps to reduce the space occupied by the first extension portion 312 and the second extension portion 322 in the first direction Z.

[0155] In some embodiments, the second extension portion 322 includes a third portion 3221 and a third protrusion 3222, wherein the third portion 3221 is connected to the second main portion 321. In two adjacent battery cells 11, the first protrusion 3123 protrudes toward the first electrical connection end of one battery cell 11, and the third protrusion 3222 protrudes toward the second electrical connection end of the other battery cell 11, and the third protrusion 3222 is connected to the second electrical connection end. Exemplarily, the third protrusion 3222 protrudes toward and is connected to the electrode terminal 112 of the other battery cell 11.

[0156] In some embodiments, two opposite surfaces of the third portion 3221 along the first direction Z are flush with two opposite surfaces of the second body portion 321 along the first direction Z, respectively.

[0157] In some embodiments, the third protrusion 3222 is welded to the electrode terminal 112 .

[0158] In some embodiments, there are multiple second extension portions 322 , and the multiple second extension portions 322 are arranged along the circumference of the battery cell 11 .

[0159] In some embodiments, the battery pack includes a first insulating member 6, at least a portion of which is disposed between adjacent battery cells 11. In a first direction Z, at least a portion of the first insulating member 6 is disposed between the cell casing 111 and the second main body 321 of one of the battery cells, wherein the battery cell 11 is connected to the second busbar 32. The first insulating member 6 can separate the second main body 321 from the cell casing 111, reducing the risk of a short circuit between the second busbar 32 and the cell casing 111 of the same battery cell 11.

[0160] In some embodiments, the first insulating member 6 is an annular structure; in the first direction Z, at least a portion of the first insulating member 6 is clamped between two adjacent battery cells 11 .

[0161] In some embodiments, the first insulating member 6 is sealed and connected to adjacent battery cells 11. For example, the first insulating member 6 and adjacent battery cells 11 are bonded together using glue. For example, adjacent battery cells 11 compress the first insulating member 6, reducing the gap between the first insulating member 6 and the adjacent battery cells 11. The sealed connection between the first insulating member 6 and the battery cells 11 can reduce the risk of corrosion at the connection between the first busbar 31 and the bottom wall 1111, as well as at the connection between the second busbar 32 and the electrode terminal 112.

[0162] In some embodiments, the battery cell assembly 1 is disposed within the bracket 5. The bracket 5 includes a third bracket opening 53, and the battery pack includes an adhesive member 7, at least a portion of which is disposed within the third bracket opening 53. The battery cell assembly 1, the bracket 5, and the housing 2 are bonded together by the adhesive member 7, which can improve the overall strength of the battery pack. When the battery pack is subjected to external forces, the adhesive member 7 can limit the movement of the battery cell assembly 1 within the housing 2, thereby improving the stability of the battery cell assembly 1.

[0163] In some embodiments, the third bracket opening 53 is configured to allow insulating material to flow into the bracket 5 through the third bracket opening 53, and the insulating material is cured to form the adhesive member 7. Optionally, the insulating material includes glue.

[0164] In some embodiments, the adhesive 7 includes structural adhesive. The structural adhesive can adhere the battery cell assembly 1 to the housing 2. The first insulating member 6 can stop the structural adhesive and reduce the risk of the structural adhesive flowing between adjacent battery cells 11.

[0165] In some embodiments, the adhesive member 7 is made of insulating material.

[0166] In some embodiments, the third bracket opening 53 is disposed on at least one side of the bracket 5 along the third direction X, and the third direction X, the second direction Y, and the first direction Z are perpendicular to each other.

[0167] In some embodiments, the first bracket 51 has a third recess 511 , and the second bracket 52 has a fourth recess 524 . The third recess 511 and the fourth recess 524 are opposite to each other along the second direction Y and form a third bracket opening 53 .

[0168] In some embodiments, there are multiple third bracket openings 53. For example, both sides of the bracket 5 along the third direction X are provided with third bracket openings 53.

[0169] In some embodiments, the housing 2 includes a first housing opening 21. After the bracket 5 and the battery cell assembly 1 are installed in the housing 2, the first housing opening 21 is configured to allow insulating material to flow through the first housing opening 21 into the housing 2 and then into the bracket 5 through the third bracket opening 53. The insulating material then solidifies to form the adhesive member 7. Optionally, the insulating material includes glue. Optionally, the third bracket opening 53 is positioned opposite the first housing opening 21 to facilitate the flow of the insulating material.

[0170] In some embodiments, a portion of the adhesive member 7 is accommodated in the first housing opening 21. The adhesive member 7 can close the first housing opening 21, thereby improving sealing performance.

[0171] In some embodiments, there are multiple first housing openings 21 .

[0172] In some embodiments, each third bracket opening 53 is opposite to at least two first housing openings 21. Structural adhesive can be injected into the housing 2 through one first housing opening 21. During the injection process, the other first housing opening 21 can be used as an observation port to observe the filling amount of the structural adhesive.

[0173] 12 to 18 , in some embodiments, a battery pack includes a circuit board assembly 8 and a first conductive member 9 , wherein the cell assembly 1 and the circuit board assembly 8 are arranged along a first direction Z. One end of the first conductive member 9 is connected to the cell 11 closest to the circuit board assembly 8 , and the other end of the first conductive member 9 extends out of the bracket 5 and is connected to the circuit board assembly 8 .

[0174] In some embodiments, the first conductive member 9 is configured to transmit an electrical signal and / or power of the battery cell assembly 1. The electrical signal may include at least one of a voltage signal, a current signal, and a temperature signal.

[0175] In some embodiments, the circuit board assembly 8 is located outside the bracket 5 .

[0176] Exemplarily, the first conductive member 9 is configured to transmit power of the battery cell assembly 1. For example, the first conductive member 9 is connected to the total positive terminal of the battery cell assembly 1.

[0177] In some embodiments, the circuit board assembly 8 includes a first circuit board 81, and the sampling assembly 4 and the first conductive member 9 are both connected to the first circuit board 81. Exemplarily, the first circuit board 81 can be a printed circuit board or a flexible circuit board.

[0178] In some embodiments, the first conductive member 9 is connected to the electrode terminal 112 of the battery cell 11 closest to the circuit board assembly 8. Alternatively, the first conductive member 9 is connected to the electrode terminal 112, the electrode terminal 112 is connected to the positive electrode sheet, and the first conductive member 9 is connected to the total positive terminal of the battery cell assembly 1.

[0179] In some embodiments, the first conductive member 9 includes a fourth conductive segment 91, a bent segment 92 and a fifth conductive segment 93. The fourth conductive segment 91 is connected to the electrode terminal 112 of the battery cell 11 closest to the circuit board assembly 8. The fifth conductive segment 93 passes between the first bracket 51 and the second bracket 52 and connects to the circuit board assembly 8. The first bracket 51 and the second bracket 52 clamp the fifth conductive segment 93, and the bent segment 92 connects the fourth conductive segment 91 and the fifth conductive segment 93.

[0180] In some embodiments, the fourth conductive segment 91 and the curved segment 92 are located inside the bracket 5 .

[0181] The bent segment 92 can be compatible with the tolerance in the first direction Z, and is beneficial in reducing the pulling force of the fifth conductive segment 93 on the circuit board assembly 8 by deformation when the battery pack is subjected to external force, thereby reducing the risk of connection failure between the fifth conductive segment 93 and the circuit board assembly 8.

[0182] In some embodiments, one of the first bracket 51 and the second bracket 52 is provided with a second protrusion 512, and the other of the first bracket 51 and the second bracket 52 is provided with a second recess 525. The second protrusion 512 is inserted into the second recess 525, and the first conductive member 9 passes between the second protrusion 512 and the second recess 525. The matching structure of the second protrusion 512 and the second recess 525 can position the first conductive member 9 and limit its shaking when the battery pack is subjected to external force.

[0183] In some embodiments, the second bracket 52 is provided with a second recess 525 , the first bracket 51 is provided with a second protrusion 512 , and the fifth conductive segment 93 passes between the second protrusion 512 and the second recess 525 .

[0184] In some embodiments, the battery pack includes a second conductive member 10, which includes a first conductive segment 101, a second conductive segment 102, and a third conductive segment 103. The first conductive segment 101 is disposed outside the bracket 5, the second conductive segment 102 is connected to the circuit board assembly 8, and the third conductive segment 103 passes through the first bracket 51 and is connected to the battery cell 11 farthest from the circuit board assembly 8.

[0185] In some embodiments, the second conductive member 10 is configured to transmit an electrical signal and / or power of the battery cell assembly 1. The electrical signal may include at least one of a voltage signal, a current signal, and a temperature signal.

[0186] Exemplarily, the second conductive member 10 is configured to transmit power of the battery cell assembly 1. Optionally, the second conductive member 10 is connected to the total negative terminal of the battery cell 11 module.

[0187] In some embodiments, the first conductive segment 101 extends along the first direction Z, and the second conductive segment 102 and the third conductive segment 103 are respectively connected to two ends of the first conductive segment 101 along the first direction Z.

[0188] In some embodiments, the first bracket 51 and the first conductive segment 101 are arranged along the second direction Y.

[0189] In some embodiments, the circuit board assembly 8 includes a second circuit board 82, and the second conductive member 10 is connected to the second circuit board 82. Exemplarily, the second circuit board 82 includes a printed circuit board or a flexible circuit board.

[0190] In some embodiments, the first circuit board 81 and the second circuit board 82 are arranged along the first direction Z.

[0191] In some embodiments, the second circuit board 82 includes a BMS (Battery Management System) component.

[0192] In some embodiments, along the second direction Y, the first conductive segment 101 and the sampling component 4 are disposed on opposite sides of the bracket 5. The bracket 5 separates the first conductive segment 101 and the sampling component 4 to reduce mutual interference.

[0193] In some embodiments, the housing 2 includes a first housing 23 and a second housing 22 . The battery cell assembly 1 is accommodated in the first housing 23 . The second housing 22 and the battery cell assembly 1 are arranged along the first direction Z.

[0194] In some embodiments, the second housing 22 is connected to the first housing 23. Alternatively, the second housing 22 is welded to the first housing 23. The battery cell assembly 1 is accommodated in a space formed by the first housing 23 and the second housing 22.

[0195] In some embodiments, the battery pack includes a fixing member 10a that connects the second housing 22 and the bracket 5 to improve the overall strength of the battery pack.

[0196] In some embodiments, the fixing member 10a includes a screw.

[0197] In some embodiments, the first housing 23 is an aluminum cylinder.

[0198] In some embodiments, the first housing 23 has a second housing opening 231 at one end along the first direction Z. The bracket 5 and the battery cell assembly 1 can be installed into the first housing 23 through the second housing opening 231. After the bracket 5 is installed in place, the fixing member 10a passes through the second housing 22 from the outside and is fixed to the bracket 5.

[0199] In some embodiments, the battery pack includes a third housing 10b, which is connected to the first housing 23 and covers the second housing opening 231. The third housing 10b has a third housing opening 10c, and the circuit board assembly 8 includes a connector 83, which is exposed through the third housing opening 10c and is configured to connect to an electrical device.

[0200] The present application provides an electric device, which includes at least one battery pack provided by any of the aforementioned embodiments. The battery pack can provide electrical energy for the operation of the electric device.

[0201] The electrical devices in the embodiments of the present application may include portable devices, laptop computers, electric toys, drones, power tools, energy storage systems, and the like. Power tools include metal cutting power tools and cleaning tools, such as electric drills, electric wrenches, vacuum cleaners, robot vacuums, power-assisted bicycles, and the like. The embodiments of the present application do not impose any particular restrictions on the aforementioned electrical devices.

[0202] In some embodiments, the electrical device may include an electric assisted bicycle.

[0203] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0204] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include: case; A battery cell assembly is accommodated in the housing, the battery cell assembly comprising a plurality of battery cells arranged along a first direction, each of the battery cells comprising a first electrical connection end and a second electrical connection end oppositely arranged in the first direction; Multiple groups of busbar assemblies, each group of the busbar assemblies connecting adjacent battery cells, the busbar assemblies comprising a first busbar and a second busbar, wherein, in two adjacent battery cells, the first busbar is connected to the first electrical connection end of one of the battery cells, and the second busbar is connected to the second electrical connection end of the other battery cell; as well as The sampling assembly includes a base and a plurality of conductive parts, wherein the plurality of conductive parts are spaced apart on the base along the first direction, and each of the conductive parts is connected to the first bus and the second bus of each group of the bus assemblies.

2. The battery pack according to claim 1, wherein: The battery cell includes a battery cell shell, the battery cell shell includes a bottom wall, the bottom wall and the second electrical connection end are arranged opposite to each other in the first direction, and the bottom wall is the first electrical connection end.

3. The battery pack according to claim 1 or 2, characterized in that: The battery pack includes a bracket accommodated in the housing, the bracket including a first bracket and a second bracket arranged along a second direction, the second direction being perpendicular to the first direction; In the second direction, the battery cell assembly is arranged between the first bracket and the second bracket, and the conductive portion is arranged on a side of the second bracket away from the battery cell assembly; The second bracket is provided with a first bracket opening, and the first busbar and the second busbar pass through the first bracket opening and are connected to the conductive portion.

4. The battery pack according to claim 3, wherein: The second bracket is provided with a first recess, in which at least a portion of the base is accommodated, and the first bracket opening passes through the first recess.

5. The battery pack according to claim 3 or 4, characterized in that: The battery cell includes a battery cell shell; The second bracket is provided with a second bracket opening, and the sampling assembly includes a sampling portion connected to the base, and the sampling portion passes through the second bracket opening and is connected to one of the battery cell shells.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The first busbar includes a first main portion, a first extending portion, and a first connecting portion, wherein the first extending portion is located between adjacent battery cells; The second busbar includes a second main body, a second extending portion, and a second connecting portion, wherein the second extending portion is located between adjacent battery cells; In two adjacent battery cells, the first extending portion is connected to the first electrical connection end of one of the battery cells, and the second extending portion is connected to the second electrical connection end of the other battery cell; In the first direction, the second main body portion and the first main body portion are arranged in parallel, and the first connecting portion and the second connecting portion are connected to the conductive portion; Along the first direction, a projection of the first extending portion and a projection of the second extending portion are separated from each other.

7. The battery pack according to claim 6, characterized in that: The first extension portion includes: a first portion connected to the first main body portion, the first portion being away from the first electrical connection end relative to the first main body portion; a second portion connected to the first portion, wherein a projection of the second portion overlaps with a projection of the second main portion along a second direction, and the second direction is perpendicular to the first direction; and The first protrusion is connected to the second portion, and the first protrusion protrudes toward the first electrical connection end and is connected to the first electrical connection end.

8. The battery pack according to claim 7, wherein: The second main body and the second extension form a first space, and the second portion is located in the first space.

9. The battery pack according to any one of claims 6 to 8, characterized in that: The battery pack includes a first insulating member, at least a portion of which is disposed between adjacent battery cells; The battery cell includes a battery cell shell, and the battery cell shell includes the first electrical connection end; In the first direction, at least a portion of the first insulating member is disposed between a cell casing of one of the battery cells and the second main body, wherein the battery cell is connected to the second busbar.

10. The battery pack according to any one of claims 3 to 5, characterized in that: The battery pack includes a circuit board assembly and a first conductive member, and the battery cell assembly and the circuit board assembly are arranged along the first direction; One end of the first conductive member is connected to the battery core closest to the circuit board assembly, and the other end extends out of the bracket and is connected to the circuit board assembly.

11. The battery pack according to claim 10, wherein: The battery pack includes a second conductive member, which includes a first conductive segment, a second conductive segment and a third conductive segment. The first conductive segment is arranged outside the bracket, the second conductive segment is connected to the circuit board assembly, and the third conductive segment passes through the first bracket and is connected to the battery cell farthest from the circuit board assembly.

12. The battery pack according to claim 11, wherein: Along the second direction, the first conductive segment and the sampling component are arranged on two opposite sides of the bracket.

13. The battery pack according to any one of claims 1 to 12, characterized in that: The conductive portion is located on a side of the base away from the battery core assembly; The base is provided with a first opening, and the first bus bar and the second bus bar pass through the first opening and are connected to the conductive portion.

14. The battery pack according to any one of claims 1 to 13, characterized in that: The sampling component is configured to transmit the electrical signal of the battery cell component.

15. The battery pack according to any one of claims 1 to 14, characterized in that: The battery pack includes a bracket accommodated in the shell, and the battery cell assembly is arranged in the bracket; The bracket includes a third bracket opening, the battery pack includes an adhesive member, at least a portion of the adhesive member is disposed in the third bracket opening, and the battery cell assembly, the bracket, and the shell are bonded together by the adhesive member.

16. An electrical device, characterized in that: Comprising the battery pack according to any one of claims 1-15.

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