Battery pack and electric device

Abstract

The present application discloses a battery pack and an electric device. The battery pack comprises a housing, a battery cell assembly, first insulating members, and bus-bar assemblies. The battery cell assembly is accommodated in the housing, and the battery cell assembly comprises multiple battery cells arranged in a first direction. In the first direction, at least part of each first insulating member is arranged between two adjacent battery cells. Each first insulating member and corresponding two adjacent battery cells form a first space, and the first space comprises a first opening. One part of each bus-bar assembly is disposed in a corresponding first space and connected to corresponding adjacent battery cells, and the other part of said bus-bar assembly is led out from a corresponding first opening.

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 202410161111.4 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 reliability 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 reliability.

[0006] In a first aspect, the present application provides a battery pack comprising a shell, a battery cell assembly, a first insulating member and a bus assembly; the battery cell assembly is accommodated in the shell, and the battery cell assembly comprises a plurality of battery cells arranged along a first direction; in the first direction, at least a portion of the first insulating member is disposed between adjacent battery cells; the first insulating member and two adjacent battery cells form a first space, and the first space has a first opening; a portion of the bus assembly is disposed in the first space and connects adjacent battery cells, and another portion of the bus assembly is led out from the first opening.

[0007] The connection between the busbar assembly and the battery cell is arranged in the first space, which can reduce the risk of corrosion from external impurities at the connection between the busbar assembly and the battery cell, improve the current flow capacity between the busbar assembly and the battery cell, reduce the risk of failure of the connection between the busbar assembly and the battery cell, and improve the reliability of the battery pack. The provision of the first opening facilitates the busbar assembly to be led out of the first insulating member, thereby achieving the voltage extraction of the battery cell.

[0008] In one or more optional embodiments above, the first insulating member includes a main body and a first protrusion; along the first direction, the first protrusion protrudes from the main body, and the first protrusion extends circumferentially along the main body; in two adjacent battery cells, the first protrusion is abutted against one of the battery cells along the first direction; the first protrusion, the main body and the battery cell abutting against the first protrusion form a first opening; by using the main body and the battery cell to define the first opening, the size of the first opening along the first direction can be increased, thereby facilitating the lead-out of the bus assembly.

[0009] In one or more optional embodiments above, the busbar assembly includes a first busbar and a second busbar, the first busbar includes a first main body, a first extension and a first connecting portion, and the second busbar includes a second main body, a second extension and a second connecting portion; in a first direction, the main body, the second main body and the first main body are arranged; in two adjacent battery cells, the first extension is connected to one battery cell, the second extension is connected to the other battery cell, and the first connecting portion and the second connecting portion are led out from the first opening.

[0010] The first and second main bodies can share space with the first protrusion in the first direction, thereby improving space utilization. The first and second busbars pass through the first opening, so that the first and second connecting parts are led out of the first insulating member.

[0011] In one or more of the above optional embodiments, the main body is provided with a third opening, and at least a portion of the first extension portion is located in the third opening; the first extension portion can utilize the space of the third opening, thereby improving space utilization, reducing the size of the battery pack in the first direction, and improving the energy density of the battery pack.

[0012] In one or more optional embodiments above, the second extension portion passes through the third opening and is connected to the battery cell; by providing the third opening, the second extension portion can be avoided to achieve connection between the second extension portion and the battery cell.

[0013] In one or more optional embodiments above, the battery cell includes a first electrical connection end and a second electrical connection end arranged opposite to each other in a first direction; 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.

[0014] In one or more optional embodiments above, the battery cell includes a battery cell shell and an electrode terminal, the electrode terminal is the second electrical connection end; the battery cell shell includes a side wall, a bottom wall and a top wall, the side wall connects the top wall and the bottom wall, the bottom wall and the electrode terminal are arranged opposite to each other in a first direction, and the bottom wall is the first electrical connection end.

[0015] In one or more optional embodiments above, in two adjacent battery cells, the first protrusion abuts against the battery cell shell of one of the battery cells along the first direction; when viewed along the first direction, the first protrusion is arranged around the outside of the first main body and the second main body; the first protrusion can limit the first main body and the second main body from the outer periphery, thereby reducing the movement of the first main body and the second main body relative to the battery cell when the battery pack is subjected to external force.

[0016] In one or more optional embodiments above, the first insulating member is provided with a second opening, the second opening is connected to the first space, and the second opening is connected to the outside of the battery cell assembly; the battery cell includes a pressure relief portion, and the pressure relief portion is exposed in the first space; when an abnormality occurs in the battery cell, the internal material of the battery cell is discharged into the first space through the pressure relief portion, and then quickly discharged to the outside of the battery cell assembly through the second opening, thereby improving the safety of the battery cell assembly.

[0017] In one or more optional embodiments above, the battery cell includes a battery cell shell and an electrode terminal, the polarity of the battery cell shell and the electrode terminal are opposite, the battery cell shell includes a side wall, a bottom wall and a top wall, the side wall is connected to the top wall and the bottom wall, and the top wall and the bottom wall are arranged opposite to each other in a first direction; in the first direction, at least a portion of the first insulating member is arranged between the battery cell shell and the second main body of another battery cell, wherein the battery cell is connected to the second bus; the first insulating member can reduce the risk of short circuit in the same battery cell.

[0018] In one or more optional embodiments above, in two adjacent battery cells, the first connecting portion is connected to the bottom wall of one battery cell, and the second connecting portion is connected to the electrode terminal of the other battery cell.

[0019] In one or more optional embodiments above, the first insulating member includes a second protrusion, and the first protrusion and the second protrusion protrude from both sides of the main body respectively; the first protrusion includes a first arc-shaped portion, and the second protrusion includes a second arc-shaped portion; in two adjacent battery cells, the first arc-shaped portion is connected to the side wall of one of the battery cells, and the second arc-shaped portion is connected to the side wall of the other battery cell.

[0020] The first curved portion can contact and connect with the curved portion of the side wall of one battery cell, thereby increasing the contact area between the first protrusion and the side wall and improving the sealing performance. The second curved portion can contact and connect with the curved portion of the side wall of another battery cell, thereby increasing the contact area between the second protrusion and the side wall and improving the sealing performance.

[0021] In one or more optional embodiments above, the battery pack includes a bracket and a sampling assembly, which are accommodated in a shell; the bracket includes a first bracket and a second bracket arranged along a second direction, and the second direction is perpendicular to the first direction; in the second direction, the battery cell assembly is arranged between the first bracket and the second bracket; the sampling assembly is located 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 bus assembly passes through the first bracket opening and is connected to the sampling assembly.

[0022] In one or more optional embodiments above, the sampling assembly includes a base and a plurality of conductive parts, and the plurality of conductive parts are arranged on the base at intervals along the first direction; the conductive part is located on a side of the base away from the battery cell assembly, and the base is provided with a fourth opening, and each group of busbar assemblies passes through the fourth opening and is connected to the conductive part.

[0023] In one or more optional embodiments above, the first opening, the first bracket opening, and the fourth opening are arranged along the second direction, and the first busbar and the second busbar pass through the first opening, the first bracket opening, and the fourth opening.

[0024] In one or more of the above optional embodiments, the battery cell assembly is adhered to the first bracket and / or the second bracket.

[0025] In one or more optional embodiments above, the second bracket is provided with a second bracket opening; the sampling assembly includes a sampling portion connected to the base, the sampling portion passes through the second bracket opening and is connected to one of the battery cell casings.

[0026] In one or more of the above optional embodiments, the sampling component is configured to transmit the electrical signal of the battery cell component.

[0027] In one or more optional embodiments above, the first protrusion includes a first sub-portion, which protrudes from the main body along the first direction; the first sub-portion is abutted against the cell shell of one of the adjacent battery cells along the first direction; a gap is formed between the battery cell and the main body, at least part of the first bus is located in the gap, and at least part of the second bus is located in the gap.

[0028] In one or more optional embodiments above, in two adjacent battery cells, at least a portion of the first protrusion is located outside the side wall of one of the battery cells, wherein the bottom wall of the battery cell is close to the main body, thereby strengthening the insulation between adjacent battery cells.

[0029] In one or more optional embodiments above, in some embodiments, in two adjacent battery cells, at least a portion of the second protrusion is located on the outside of the side wall of one of the battery cells, wherein the top wall of the battery cell is close to the main body, thereby strengthening the insulation between adjacent battery cells.

[0030] 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

[0031] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[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 taken along the EE direction;

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

[0036] FIG4 is an enlarged schematic diagram of block A in FIG2 ;

[0037] FIG5 is an enlarged schematic diagram of FIG2 at the circle B;

[0038] FIG6 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0039] FIG7 is a schematic diagram of a partial structure of a battery pack provided by some embodiments of the present application;

[0040] FIG8 is a schematic diagram of an insulating member and a busbar assembly provided in some embodiments of the present application;

[0041] FIG9 is a schematic diagram of FIG8 viewed in a first direction;

[0042] FIG10 is a schematic structural diagram of an insulating member provided in some embodiments of the present application;

[0043] FIG11 is a schematic cross-sectional view taken along the FF direction of FIG9 ;

[0044] FIG12 is an enlarged schematic diagram of the circle frame of FIG11;

[0045] FIG13 is a schematic diagram of the battery cell shown in FIG6 after being connected to the first busbar;

[0046] FIG14 is a schematic structural diagram of a first bus provided in some embodiments of the present application;

[0047] FIG15 is a schematic structural diagram of a second bus provided in some embodiments of the present application;

[0048] FIG16 is a 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 a schematic structural diagram of a second bracket provided in some embodiments of the present application;

[0051] FIG19 is a schematic diagram of a first bracket and a second conductive member provided in some embodiments of the present application;

[0052] FIG20 is an enlarged schematic diagram of the circle C in FIG2;

[0053] FIG. 21 is an enlarged schematic diagram of the circle D in FIG. 2 .

[0054] The reference numerals of the specific embodiments are as follows: DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the described examples are only some examples of the present invention, not all examples. All other examples derived by persons of ordinary skill in the art based on the examples of the present invention fall within the scope of protection of the present invention.

[0056] 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.

[0057] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also 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.

[0058] 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.

[0059] The battery pack and electrical equipment of the present application are described below with reference to the accompanying drawings.

[0060] 1 to 21 , an embodiment of the present application provides a battery pack including a housing 2 and a cell assembly 1 accommodated in the housing 2 .

[0061] In some embodiments, the housing may be a square housing, a cylindrical housing, or another housing shape. The housing 2 may be a metal housing, a plastic housing, a metal-plastic composite housing, or a housing made of other materials. The housing 2 may be an integrally formed housing or may be formed by assembling multiple independently formed components.

[0062] In some embodiments, the housing 2 is a metal housing, which has relatively high strength.

[0063] 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.

[0064] 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.

[0065] The battery cell 11 can be a square battery cell, a cylindrical battery cell or other special-shaped battery cells. Optionally, the battery cell 11 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.

[0066] In some embodiments, the multiple battery cells 11 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 11 are connected in series and in parallel. Optionally, the multiple battery cells 11 of the battery cell assembly 1 are connected in series.

[0067] 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.

[0068] In some embodiments, each battery cell 11 includes a first electrical connection end and a second electrical connection end disposed opposite to each other along a first direction Z. Optionally, the first electrical connection end and the second electrical connection end have opposite polarities, 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.

[0069] In some embodiments, the battery cell 11 includes a battery cell case 111 and an electrode terminal 112 .

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some 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. The polarity of the electrode terminal 112 is opposite to that of the cell housing 111 .

[0077] 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.

[0078] 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 .

[0079] 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 is connected to 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.

[0080] In some embodiments, two adjacent battery cells 11 along the first direction Z are connected in parallel. Alternatively, the electrode terminals 112 of the two battery cells 11 are connected and facing each other, so that the two battery cells 11 are connected in parallel.

[0081] In some embodiments, the battery cell housing 111 includes side walls 1112 and a top wall 1113 , the side walls 1112 connect the top wall 1113 and the bottom wall 1111 , the top wall 1113 and the bottom wall 1111 are arranged opposite to each other in a first direction Z, and the bottom wall 1111 is a first electrical connection end.

[0082] In some embodiments, the battery pack includes a first insulating member 6 , and at least a portion of the first insulating member 6 is disposed between adjacent battery cells 11 in a first direction Z. The first insulating member 6 and two adjacent battery cells 11 form a first space S.

[0083] There may be one or more first insulating members 6 . For example, there may be more than one first insulating member 6 , and a first insulating member 6 is provided between any two adjacent battery cells 11 .

[0084] The first space S may be a closed space, or may be connected to the space outside the first insulating member 6 .

[0085] In some embodiments, the battery pack includes a busbar assembly 3 , which connects adjacent battery cells 11 .

[0086] The busbar assembly 3 can connect adjacent battery cells 11 in series or in parallel. Optionally, in two adjacent battery cells 11, the battery cell housing 111 and the electrode terminals 112 of each battery cell 11 are arranged relative to each other along the first direction Z, and the busbar assembly 3 is connected to the battery cell housing 111 of one battery cell 11, and the busbar assembly 3 is connected to the electrode terminals 112 of the other battery cell 11, so that the two adjacent battery cells 11 are connected in series.

[0087] In some embodiments, the polarities of the cell housing 111 and the electrode terminals 112 are opposite. In two adjacent cell cells 11 , the busbar assembly 3 is connected to the cell housing 111 of one cell 11 , and the busbar assembly 3 is connected to the electrode terminals 112 of the other cell 11 .

[0088] In some embodiments, there are multiple busbar assemblies 3 arranged in a first direction Z, with one busbar assembly 3 connecting two adjacent battery cells 11. Optionally, the multiple busbar assemblies 3 connect the multiple battery cells 11 of the battery cell assembly 1 in series.

[0089] In some embodiments, a portion of the busbar assembly 3 is disposed in the first space S and connects adjacent battery cells 11. The connection between the busbar assembly 3 and the battery cells 11 is disposed in the first space S, which can reduce the risk of corrosion by external impurities at the connection between the busbar assembly 3 and the battery cells 11, improve the current flow capacity between the busbar assembly 3 and the battery cells 11, reduce the risk of connection failure between the busbar assembly 3 and the battery cells 11, and improve the reliability of the battery pack.

[0090] In some embodiments, the first space S has a first opening S1. A portion of the busbar assembly 3 is disposed in the first space S, and another portion of the busbar assembly 3 is led out of the first opening S1. The provision of the first opening S1 facilitates leading the busbar assembly 3 out of the first insulating member 6, thereby enabling the voltage of the battery cell 11 to be drawn out.

[0091] In some embodiments, the first insulating member 6 includes a main body 61 . In the first direction Z, the main body 61 is disposed between adjacent battery cells 11 .

[0092] In some embodiments, the first insulating member 6 includes a main body portion 61 and a first protrusion 62 . Along the first direction Z, the first protrusion 62 protrudes from the main body portion 61 .

[0093] In some embodiments, the first protrusion 62 extends along the circumference of the main body 61. In two adjacent battery cells 11, the first protrusion 62 abuts against one of the battery cells 11 along the first direction Z. A space is formed between the main body 61 and the battery cells 11 for arranging the busbar assembly 3.

[0094] In some embodiments, in two adjacent battery cells 11 , at least a portion of the first protrusion 62 is located outside the side wall 1112 of one of the battery cells 11 , wherein the bottom wall 1111 of the battery cell 11 is close to the main body 61 , thereby strengthening the insulation between adjacent battery cells 11 .

[0095] In some embodiments, the first protrusion 62 is compressed to improve the seal between the first insulating member 6 and the battery cell 11. In some embodiments, in two adjacent battery cells, the first protrusion 62 is compressed by the bottom wall 1111 of one battery cell 11 and the top wall 1113 of the other battery cell 11, thereby improving the seal between the first insulating member 6 and the battery cell 11.

[0096] In some embodiments, the first insulating member 6 may include one or more first protrusions 62. Alternatively, the first insulating member 6 includes one first protrusion 62. Alternatively, the first insulating member 6 includes two first protrusions 62.

[0097] In some embodiments, the battery cell 11 is a cylindrical battery cell, and the main body 61 is circular. Referring to FIG9 , the first protrusion 62 is arc-shaped when viewed along the first direction Z. Optionally, the central angle of the first protrusion 62 is greater than or equal to 270°.

[0098] In some embodiments, the first protrusion 62 is disposed along an edge of the main body 61 .

[0099] In some embodiments, the first space S includes a space enclosed by the first protrusion 62 , the main body 61 , and the battery cell 11 abutting against the first protrusion 62 .

[0100] In some embodiments, the first protrusion 62, the main body 61, and the battery cell 11 abutting against the first protrusion 62 form a first opening S1. The main body 61 and the battery cell 11 define the first opening S1, which can increase the size of the first opening S1 along the first direction Z, facilitating the extraction of the busbar assembly 3.

[0101] In some embodiments, the main body 61 has a first surface 611 on one side along the first direction Z. Optionally, the first surface 611 may be a plane perpendicular to the first direction Z.

[0102] In some embodiments, the first protrusion 62 protrudes from the first surface 611 along the first direction Z.

[0103] In some embodiments, in two adjacent battery cells 11 , the first protrusion 62 abuts against the battery cell casing 111 of one of the battery cells 11 along the first direction Z.

[0104] In some embodiments, each 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 one of the battery cells 11, and the second busbar 32 is connected to the other battery cell 11.

[0105] In some embodiments, the first busbar 31 is connected to the first electrical connection end, and the second busbar 32 is connected to the second electrical connection end. For example, 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.

[0106] 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.

[0107] In some embodiments, the first bus bar 31 and the second bus bar 32 are led out from the first opening S1 .

[0108] 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 second busbar 32 includes a second main portion 321, a second extension portion 322, and a second connection portion 323. The main portion 61, the second main portion 321, and the first main portion 311 are arranged in the first direction Z.

[0109] In some embodiments, in two adjacent battery cells 11 , the first extending portion 312 is connected to one battery cell 11 , the second extending portion 322 is connected to the other battery cell 11 , and the first connecting portion 313 and the second connecting portion 323 are led out from the first opening S1 .

[0110] The first and second main bodies 311 and 321 can share space with the first protrusion 62 in the first direction Z, thereby improving space utilization. The first and second busbars 31 and 32 pass through the first opening S1, so that the first and second connecting portions 313 and 323 are led out of the first insulating member 6.

[0111] In some embodiments, in the first direction Z, in two adjacent battery cells 11, the main body 61 is located between the second bus 32 and the battery cell shell 111 of one of the battery cells 11, wherein the electrode terminal 112 of the battery cell 11 is connected to the second bus 32, thereby reducing the risk of short circuit of the same battery cell 11.

[0112] In some embodiments, 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 , and the second extension portion 322 is connected to the second electrical connection end of the other battery cell 11 .

[0113] 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. In two adjacent battery cells 11, the first extension portion 312 is connected to the bottom wall 1111 of one of the battery cells 11, and the second extension portion 322 is connected to the electrode terminal 112 of the other battery cell 11.

[0114] In some embodiments, the first extension portion 312 and the second extension portion 322 are accommodated in the first space S. Optionally, along the first direction Z, the first extension portion 312 and the second extension portion 322 are located between adjacent battery cells 11 .

[0115] In some embodiments, the first extending portion 312 and the first connecting portion 313 are respectively connected to the first main body portion 311 .

[0116] In some embodiments, the first extension portion 312 and the first connection portion 313 are respectively connected to two sides of the first main body portion 311. For example, the first extension portion 312 can be welded to the bottom wall 1111, such as by laser welding.

[0117] In some embodiments, the second extending portion 322 and the second connecting portion 323 are respectively connected to the first main body portion 311 .

[0118] In some embodiments, the second extension portion 322 and the second connection portion 323 are respectively connected to two sides of the second main body portion 321. For example, the second extension portion 322 can be welded to the electrode terminal 112, such as by laser welding.

[0119] In some embodiments, the second main body portion 321 and the first main body portion 311 may be in contact with each other along the first direction Z, or may be bonded together by adhesive. Alternatively, the second main body portion 321 and the first main body portion 311 may be in direct contact with each other along the first direction Z, thereby saving space in the first direction Z and increasing the contact area between the first busbar 31 and the second busbar 32, thereby improving the flow capacity between the first busbar 31 and the second busbar 32.

[0120] In some embodiments, the first extension portion 312 includes a first portion 3121. The first portion 3121 is connected to the first main portion 311 and is 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 first portion 3121 is spaced apart from the bottom wall 1111 of one of the battery cells 11, relative to the first main portion 311, where the battery cell 11 is the battery cell 11 connected to the first extension portion 312.

[0121] 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.

[0122] In some embodiments, the first extension portion 312 includes a third protrusion 3123, which is connected to the second portion 3122. The third protrusion 3123 protrudes toward and is connected to the first electrical connection end of the battery cell connected to the first extension portion 312. Exemplarily, the third protrusion 3123 is connected to the bottom wall 1111 of one of the battery cells 11.

[0123] The third protrusion 3123 is designed to protrude, reducing the gap between the third protrusion 3123 and the bottom wall 1111 when assembling the battery cell 11 and the first busbar 31, thereby improving the connection strength between the first extension 312 and the bottom wall 1111. 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 occupied by the third protrusion 3123. When the battery pack is subjected to external forces, the bent first portion 3121 can elastically deform, thereby relieving stress and reducing the risk of failure in the connection between the third protrusion 3123 and the bottom wall 1111.

[0124] In some embodiments, the third protrusion 3123 is welded to the bottom wall 1111. By welding the third protrusion 3123 to the bottom wall 1111, the risk of cold welding can be reduced.

[0125] 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 .

[0126] 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.

[0127] In some embodiments, the second extension portion 322 includes a third portion 3221 and a fourth protrusion 3222, wherein the third portion 3221 is connected to the second main body portion 321. In two adjacent battery cells 11, the third protrusion 3123 protrudes toward the first electrical connection end of one battery cell 11, and the fourth protrusion 3222 protrudes toward the second electrical connection end of the other battery cell 11. The fourth protrusion 3222 is connected to the second electrical connection end of the other battery cell 11. Exemplarily, the fourth protrusion 3222 protrudes toward the electrode terminal 112 of the other battery cell 11 and is connected to the electrode terminal 112.

[0128] 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.

[0129] In some embodiments, the fourth protrusion 3222 is welded to the electrode terminal 112 .

[0130] 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 .

[0131] In some embodiments, the main body 61 is provided with a third opening 612 that extends through the main body 61 along the first direction Z. In two adjacent battery cells 11, the second extension 322 passes through the third opening 612 and connects to the other battery cell 11. The provision of the third opening 612 allows the second extension 322 to be avoided, thereby ensuring connection between the second extension 322 and the battery cell 11.

[0132] In some embodiments, the second extension portion 322 passes through the third opening 612 and is connected to the electrode terminal 112 of another battery cell 11 .

[0133] In some embodiments, the fourth protrusion 3222 passes through the third opening 612 and is connected to the electrode terminal 112 of one battery cell 11 .

[0134] 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 bottom wall 1111 and the connection between the second extension portion 322 and the electrode terminal 112 .

[0135] In some embodiments, the main body 61 is provided with a third opening 612, and at least a portion of the first extension 312 is located in the third opening 612. The first extension 312 can utilize the space of the third opening 612, thereby improving space utilization, reducing the size of the battery pack in the first direction Z, and increasing the energy density of the battery pack.

[0136] In some embodiments, the first portion 3121 is at least partially located in the third opening 612 .

[0137] In some embodiments, the second portion 3122 is at least partially located in the third opening 612 .

[0138] In some embodiments, the third protrusion 3123 is at least partially located in the third opening 612

[0139] In some embodiments, in the first direction Z, at least a portion of the first insulating member 6 is disposed between the battery cell shell 1111 connected to another battery cell 11 and the second main body 321 , wherein the battery cell 11 is connected to the second bus 32 , to reduce the risk of short circuit of the same battery cell 11 .

[0140] In some embodiments, in two adjacent battery cells 11, the first insulating member 6 is disposed between the bottom wall 1111 of one battery cell 11 and the top wall 1113 of the other battery cell 11 in the first direction Z. The first insulating member 6 separates the bottom wall 1111 of one battery cell 11 from the top wall 1113 of the other battery cell 11, reducing the risk of a short circuit between the two adjacent battery cells 11.

[0141] In some embodiments, among two adjacent battery cells 11, the top wall 1113 of one battery cell 11 and the bottom wall 1111 of the other battery cell 11 clamp the first insulating member 6, which can improve the stability of the first insulating member 6 and reduce the risk of displacement of the first insulating member 6 when the battery pack is subjected to external force.

[0142] In some embodiments, the first protrusion 62 includes a first sub-portion 621 , which protrudes from the main portion 61 along the first direction Z. The first sub-portion 621 abuts against the cell casing 111 of one of the adjacent battery cells 11 along the first direction Z. A gap is formed between the battery cell 11 and the main portion 61 , and at least a portion of the first busbar 31 and at least a portion of the second busbar 32 are located in the gap.

[0143] The first protrusion 62 includes a first curved portion 622, which is connected to the battery cell 11. The first curved portion 622 can connect to the curved portion of the battery cell 11, thereby increasing the contact area between the first protrusion 62 and the battery cell 11 and improving the sealing performance. Optionally, the first curved portion 622 is in contact with the battery cell 11. Optionally, the first sub-portion 621 connects to the first curved portion 622.

[0144] In some embodiments, in two adjacent battery cells 11 , the first arc-shaped portion 622 is connected to the side wall 1112 of one of the battery cells 11 to improve the connection strength and sealing performance between the first insulating member 6 and the battery cell 11 .

[0145] In some embodiments, the surface where the first arc-shaped portion 622 contacts the sidewall 1112 is an arc surface.

[0146] In some embodiments, the first sub-portion 621 is connected to an outer edge of the main body 61 .

[0147] In some embodiments, the end of the side wall 1112 connected to the bottom wall 1111 is bent into an arc shape. The arc-shaped end of the side wall 1112 can release stress during the molding process of the battery cell housing 111, reducing the risk of the battery cell housing 111 breaking.

[0148] In some embodiments, in two adjacent battery cells 11 , the first sub-portion 621 abuts against the bottom wall 1111 of one of the battery cells 11 along the first direction Z, and the first curved portion 622 is connected to the curved end of the side wall 1112 of the battery cell 11 .

[0149] In some embodiments, the top wall 1113 is connected to the side wall 1112 . Optionally, the top wall 1113 is annular.

[0150] In some embodiments, the first insulating member 6 includes a second protrusion 63 . The second protrusion 63 and the first protrusion 62 are respectively located on both sides of the main body 61 . The second protrusion 63 extends along the circumference of the main body 61 .

[0151] In some embodiments, in two adjacent battery cells 11 , at least a portion of the second protrusion 63 is located outside the side wall 1112 of one of the battery cells 11 , wherein the top wall 1113 of the battery cell 11 is close to the main body 61 , thereby strengthening the insulation between adjacent battery cells 11 .

[0152] In some embodiments, in two adjacent battery cells 11, the first protrusion 62 abuts against one of the battery cells 11, and the second protrusion 63 abuts against the other battery cell 11. By providing the first protrusion 62 and the second protrusion 63, the compressibility of the first insulating member 6 in the first direction Z can be increased, thereby improving the sealing performance.

[0153] In some embodiments, the second protrusion 63 extends along the circumference of the main body 61 and is annular. Optionally, the second protrusion 63 is annular.

[0154] In some embodiments, the second protrusion 63 includes a second curved portion 631 . In two adjacent battery cells 11 , the first curved portion 622 is connected to the side wall 1112 of one of the battery cells, and the second protrusion 63 is connected to the side wall 1112 of the other battery cell 11 .

[0155] The second curved portion 631 can be adapted to the curved portion of the side wall 1112, thereby increasing the contact area between the insulating member 6 and the battery cell 11, improving the sealing performance and connection strength. Optionally, the battery cell 11 and the second curved portion 631 abut against each other along the first direction Z.

[0156] In some embodiments, the surface where the second arc-shaped portion 631 contacts the sidewall 1112 is an arc surface.

[0157] In some embodiments, the end portion of the side wall 1112 connected to the top wall 1113 is bent into an arc shape and is in contact with and connected to the second arc portion 631 .

[0158] In some embodiments, referring to FIG. 9 , the first protrusion 62 surrounds the first and second main body portions 311 and 321 when viewed along the first direction Z. The first protrusion 62 can limit the first and second main body portions 311 and 321 from their outer peripheries, thereby reducing movement of the first and second main body portions 311 and 321 relative to the battery cell 11 when the battery pack is subjected to external forces.

[0159] In some embodiments, the first insulating member 6 is provided with a second opening S2 , the second opening S2 is communicated with the first space S, the second opening S2 is communicated with the outside of the battery cell assembly 1 , and the first space S is communicated with the outside of the battery cell assembly 1 through the second opening S2 .

[0160] In some embodiments, the battery cell 11 includes a pressure relief portion 114 , which is exposed in the first space S. When an abnormality occurs in the battery cell 11 , the internal material of the battery cell 11 is discharged into the first space S through the pressure relief portion 114 , and then discharged to the outside of the battery cell assembly 2 through the second opening S2 , thereby improving the safety of the battery cell assembly 1 .

[0161] In some embodiments, the second opening S2 passes through the first protrusion 62 along the second direction Y.

[0162] In some embodiments, a pressure relief portion 114 is provided 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 channel, through which substances inside the battery cell 11 are discharged to the outside of the battery cell 11, thereby reducing the risk of explosion of the battery cell 11. Alternatively, the pressure relief portion 114 is provided on the bottom wall 1111.

[0163] In some embodiments, the battery pack includes a sampling assembly 4 , which is connected to the bus assembly 3 , and is accommodated in the housing 2 .

[0164] In some embodiments, the sampling assembly 4 includes a base 41 and a plurality of conductive portions 42 , wherein the plurality of conductive portions 42 are spaced apart from the base 41 along a first direction Z, and each conductive portion 42 is connected to a group of busbar assemblies 3 . For example, the conductive portion 42 is connected to the first busbar 31 and the second busbar 32 of each group of busbar assemblies 3 .

[0165] 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.

[0166] In the embodiment of the present application, the conductive portion 42 connects the first busbar 31 and the second busbar 32, thereby electrically connecting the electrode terminal 112 of one battery cell 11 to the bottom wall 1111 of another battery cell 11, thereby achieving a series connection of the two adjacent battery cells 11. The connection between the first busbar 31 and the second busbar 32 via the conductive portion 42 can reduce the resistance between the first busbar 31 and the second busbar 32, thereby reducing the resistance between the two adjacent battery cells 11, reducing heat generation during the battery pack's charge and discharge processes, and improving the battery pack's current handling capacity.

[0167] 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.

[0168] In some embodiments, the first connection portion 313 is connected to a side of the conductive portion 42 facing away from the base portion 41 , and the second connection portion 323 is connected to a side of the first connection portion 313 facing away from the conductive portion 42 .

[0169] In some embodiments, the second connection portion 323 , the first connection portion 313 , and the conductive portion 42 are welded.

[0170] In some embodiments, sampling assembly 4 is configured to transmit electrical signals from cell assembly 1. For example, the electrical signals may include at least one of voltage, current, and temperature. Sampling assembly 4 can connect to first busbar 31 and second busbar 32 to transmit electrical signal information from cell assembly 1, thereby simplifying the structure of the battery pack.

[0171] 16 to 21 , in some embodiments, the battery pack includes a bracket 5 accommodated in the housing 2. Exemplarily, the bracket 5 can be used to support the battery cell assembly 1.

[0172] In some embodiments, the bracket 5 has an inner cavity, and the battery cell assembly 1 is disposed in the inner cavity of the bracket 5 .

[0173] 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 .

[0174] 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.

[0175] 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.

[0176] 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 11 .

[0177] In some embodiments, the first bracket 51 and the second bracket 52 are both insulating brackets 5 , and 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.

[0178] 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 .

[0179] 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 is provided with a first bracket opening 521, through which the first busbar 31 and the second busbar 32 pass and are connected to the conductive portion 42. The first bracket opening 521 facilitates the passage of the first busbar 31 and the second busbar 32 through the second bracket 52, thereby achieving a connection between the conductive portion 42, the first busbar 31, and the second busbar 32.

[0180] In some embodiments, the first opening S1 and the first bracket opening 521 are arranged opposite to each other along the second direction Y, which facilitates the first busbar 31 to pass through the first opening S1 and the first bracket opening 521 and facilitates the second busbar 32 to pass through the first opening S1 and the first bracket opening 521 .

[0181] 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 group of busbar assemblies 3 pass through the same first bracket opening 521 .

[0182] 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.

[0183] 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 .

[0184] 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.

[0185] 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 battery cell 11 in the battery cell assembly 1. The sampling portion 43 may be one or more. The sampling portion 43 can be used to collect information about the battery cell 11, such as temperature. By providing the second bracket opening 523, the sampling portion 43 can be directly connected to the battery cell 11, thereby improving the accuracy of the sampling by the sampling portion 43.

[0186] In some embodiments, the sampling unit 43 is used to collect the temperature of the battery cell 11 .

[0187] In some embodiments, the sampling portion 43 is attached to the cell housing 111 to improve the accuracy of temperature collection. Optionally, the sampling portion 43 is bonded to the cell housing 111 by thermally conductive adhesive.

[0188] In some embodiments, the sampling unit 43 includes an NTC (Negative Temperature Coefficient) temperature sensor.

[0189] 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.

[0190] 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.

[0191] In some embodiments, the base 41 can collect the voltage of the battery cell 11 through the conductive portion 42 .

[0192] 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 (FPC). Multiple conductive portions 42 and multiple sampling portions 43 are connected to the first circuit board.

[0193] 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 .

[0194] 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.

[0195] 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 fourth opening 411. The first busbar 31 and the second busbar 32 pass through the fourth opening 411 and connect to the conductive portion 42. The fourth 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.

[0196] In some embodiments, the first opening S1 , the first bracket opening 521 , and the fourth opening 411 are arranged along the second direction Y, and the first busbar 31 and the second busbar 32 pass through the first opening S1 , the first bracket opening 521 , and the fourth opening 411 .

[0197] In some embodiments, there are multiple fourth openings 411 , and the multiple fourth openings 411 and the multiple first bracket openings 521 are arranged in a one-to-one correspondence.

[0198] In some embodiments, the battery cell assembly 1 is bonded to the first bracket 51 and / or the second bracket 52 .

[0199] 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.

[0200] In some embodiments, a colloid may be coated on a side of the first bracket 51 facing the battery cell assembly 1 , and the colloid adheres the first bracket 51 to the battery cell assembly 1 .

[0201] Optionally, each battery cell 11 is bonded to the first bracket 51 via colloid.

[0202] 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 bonds the second bracket 52 to the battery cell assembly 1. Optionally, each battery cell 11 is bonded to the second bracket 52 by the colloid.

[0203] In some embodiments, the battery cell assembly 1 is disposed in a bracket 5 . The bracket 5 includes a third bracket opening 53 . The battery pack includes an adhesive member 7 . At least a portion of the adhesive member 7 is disposed in the third bracket opening 53 .

[0204] The battery cell assembly 1, the bracket 5 and the shell 2 are bonded together by the adhesive 7, which can improve the overall strength of the battery pack. When the battery pack receives external force, the adhesive 7 can limit the movement of the battery cell assembly 1 in the shell 2, thereby improving the stability of the battery cell assembly 1.

[0205] 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.

[0206] 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.

[0207] In some embodiments, the adhesive member 7 is made of insulating material.

[0208] 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.

[0209] In some embodiments, the first bracket 51 has a second recess 511 , and the second bracket 52 has a third recess 524 . The second recess 511 and the third recess 524 are opposite to each other along the second direction Y and form a third bracket opening 53 .

[0210] 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.

[0211] 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 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 seventh opening 53 is positioned relative to the first housing opening 21 to facilitate the flow of the insulating material.

[0212] 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.

[0213] In some embodiments, there are multiple first housing openings 21 .

[0214] In some embodiments, the 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.

[0215] In some embodiments, the battery pack includes a circuit board assembly 8 and a first conductive member 9. The circuit board assembly 8 is located outside the bracket 5, and the battery cell assembly 1 and the circuit board assembly 8 are arranged along a first direction Z. The first conductive member 9 connects the circuit board assembly 8 and the battery cell assembly 1. In some embodiments, the circuit board assembly 8 is located outside the bracket 5. One end of the first conductive member 9 is connected to the battery 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.

[0216] 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.

[0217] 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. For example, the first circuit board 81 may include a printed circuit board or a flexible circuit board.

[0218] 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.

[0219] In some embodiments, the battery pack includes a second conductive member 10 connected to a bottom wall 1111 of the battery cell 11 farthest from the circuit board assembly 8 .

[0220] Optionally, the sampling component 4 and the second conductive member 10 are respectively arranged on both sides of the bracket 5 along the second direction Y. The bracket 5 separates the second conductive member 10 from the sampling component 4 to reduce mutual interference.

[0221] 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.

[0222] 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.

[0223] 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. For example, the second circuit board 82 includes a printed circuit board or a flexible circuit board. Optionally, the sampling assembly is connected to the second circuit board 82. Optionally, the first conductive member 9 is connected to the second circuit board 82.

[0224] In some embodiments, the first circuit board 81 and the second circuit board 82 are arranged along the first direction Z.

[0225] In some embodiments, the second circuit board 82 includes a BMS (Battery Management System) component.

[0226] In some embodiments, the housing 2 includes a second housing 22, and the second housing 22 and the battery cell assembly 1 are arranged along a first direction Z. The battery pack includes a fixing member 10a, and the battery cell assembly 1 is disposed in the bracket 5. The fixing member 10a connects the second housing 22 and the bracket 5 to improve the overall strength of the battery pack.

[0227] In some embodiments, the fixing member 10a includes a screw.

[0228] In some embodiments, the housing 2 includes a first housing 23, and the second housing 22 is connected to the first housing 23. Optionally, the second housing 22 is welded to the first housing 23.

[0229] In some embodiments, the first housing 23 is an aluminum cylinder.

[0230] 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.

[0231] In some embodiments, the battery pack further 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. The circuit board assembly 8 includes a connector 83, which is exposed through the third housing opening 10c. The connector 83 is configured to connect to an electrical device.

[0232] 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.

[0233] 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.

[0234] In some embodiments, the electrical device may include an electric assisted bicycle.

[0235] 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.

[0236] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: case; A battery cell assembly is housed in the housing, the battery cell assembly comprising a plurality of battery cells arranged along a first direction; a first insulating member, wherein at least a portion of the first insulating member is disposed between adjacent battery cells in the first direction, the first insulating member and two adjacent battery cells form a first space having a first opening; A busbar assembly, a portion of which is disposed in the first space and connects the adjacent battery cells, and another portion of which is led out from the first opening.

2. The battery pack according to claim 1, wherein: The first insulating member includes a main body and a first protrusion; Along the first direction, the first convex portion protrudes from the main body portion, and the first convex portion extends along the circumference of the main body portion. In two adjacent battery cells, the first convex portion abuts against one of the battery cells along the first direction; The first convex portion, the main body, and the battery cell abutting against the first convex portion form the first opening.

3. The battery pack according to claim 2, wherein: The busbar assembly includes a first busbar and a second busbar, the first busbar includes a first main body, a first extension and a first connecting portion, and the second busbar includes a second main body, a second extension and a second connecting portion; In the first direction, the main body, the second main body and the first main body are arranged in an array; In two adjacent battery cells, the first extending portion is connected to one battery cell, the second extending portion is connected to the other battery cell, and the first connecting portion and the second connecting portion are led out from the first opening.

4. The battery pack according to claim 3, wherein: The main body is provided with a third opening, and at least a portion of the first extension portion is located in the third opening.

5. The battery pack according to claim 4, wherein: The second extension portion passes through the third opening and is connected to another of the battery cells.

6. The battery pack according to any one of claims 3 to 5, characterized in that: The battery cell comprises a first electrical connection end and a second electrical connection end arranged opposite to each other in the first direction; 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.

7. The battery pack according to claim 6, characterized in that: The battery cell comprises a battery cell shell and an electrode terminal, wherein the electrode terminal is a second electrical connection end; The battery cell housing includes a side wall, a bottom wall, and a top wall. The side wall connects the top wall and the bottom wall. The bottom wall and the electrode terminal are arranged opposite to each other in the first direction. The bottom wall serves as the first electrical connection end.

8. The battery pack according to any one of claims 3 to 7, characterized in that: In two adjacent battery cells, the first protrusion abuts against the battery cell shell of one of the battery cells along the first direction; When viewed along the first direction, the first protrusion is arranged around the outside of the first main body and the second main body.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The first insulating member is provided with a second opening, the second opening is communicated with the first space, and the second opening is communicated with the outside of the battery cell assembly; The battery core includes a pressure relief portion, and the pressure relief portion is exposed in the first space.

10. The battery pack according to any one of claims 3 to 8, characterized in that: The battery cell comprises a battery cell shell and electrode terminals, wherein the polarities of the battery cell shell and the electrode terminals are opposite; The battery cell housing includes a side wall, a bottom wall, and a top wall, wherein the side wall connects the top wall and the bottom wall, and the top wall and the bottom wall are arranged opposite to each other in a first direction; In the first direction, at least a portion of the first insulating member is disposed between the cell casing of another cell and the second main body, wherein the cell is connected to the second busbar.

11. The battery pack according to claim 10, wherein: The first insulating member includes a second convex portion, wherein the first convex portion and the second convex portion protrude from both sides of the main body portion respectively; The first convex portion includes a first arc-shaped portion, and the second convex portion includes a second arc-shaped portion; In two adjacent battery cells, the first arc-shaped portion is connected to the side wall of one of the battery cells, and the second arc-shaped portion is connected to the side wall of the other battery cell.

12. The battery pack according to any one of claims 1 to 11, characterized in that: The battery pack includes a bracket and a sampling assembly, and the bracket and the sampling assembly are accommodated in the housing; The bracket includes 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; The sampling component is located on a side of the second bracket away from the battery cell component; The second bracket is provided with a first bracket opening, and the busbar assembly passes through the first bracket opening and is connected to the sampling assembly.

13. The battery pack according to claim 12, wherein: The sampling assembly includes a base and a plurality of conductive parts, wherein the plurality of conductive parts are spaced apart and arranged on the base along the first direction; The conductive portion is located on a side of the base away from the battery core assembly. The base is provided with a fourth opening. Each group of busbar assemblies passes through the fourth opening and is connected to the conductive portion.

14. An electrical device, characterized in that: Comprising the battery pack according to any one of claims 1-13.

Images