Battery pack and electric device

Abstract

Disclosed in the present application are a battery pack and an electric device. The battery pack comprises a battery cell assembly, a case and a first insulating part. The battery cell assembly is accommodated in the case, and the battery cell assembly comprises a plurality of battery cells arranged in a first direction, wherein each battery cell comprises a first pressure relief portion. In the first direction, at least part of the first insulating part is arranged between adjacent battery cells, and a first gap exists between the first insulating part and one battery cell, wherein a first pressure relief portion of the battery cell is exposed out of the first gap; the first insulating part is provided with a first opening; and the first gap is in communication with the first opening, and the first opening is in communication with the exterior of the battery cell assembly. The battery pack further comprises a second pressure relief portion arranged on the case.

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 202410161092.5 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 battery pack safety 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 safety.

[0006] In a first aspect, the present application provides a battery pack comprising a cell assembly, a shell, and a first insulating member. The cell assembly is housed in the shell, the cell assembly comprising a plurality of cells arranged along a first direction, the cells comprising a first pressure relief portion. In the first direction, at least a portion of the first insulating member is disposed between adjacent cells, a first gap exists between the first insulating member and one of the cells, the first pressure relief portion of the cell is exposed in the first gap, the first insulating member is provided with a first opening, the first gap is in communication with the first opening, and the first opening is in communication with the outside of the cell assembly. The battery pack further comprises a second pressure relief portion disposed in the shell.

[0007] The pressure relief path of the battery pack includes a first gap, a first opening and a second pressure relief portion. Substances discharged from the first pressure relief portion are discharged through the pressure relief path, thereby improving the safety of the battery cell assembly.

[0008] In one or more of the above optional embodiments, the battery pack includes a bracket housed within the housing, and the battery cell assembly is housed within the bracket. The bracket includes a first bracket opening extending through the bracket. The first bracket opening communicates with the first opening, facilitating faster discharge of substances from the battery cells. A passage exists between the bracket and the housing, and the first bracket opening communicates with the passage and the first opening, thereby reducing the bracket's obstruction of high-temperature gas and improving discharge efficiency.

[0009] The pressure relief path of the battery pack includes a first gap, a first opening, a channel and a second pressure relief portion. Substances discharged from the first pressure relief portion are discharged through the pressure relief path, thereby improving the safety of the battery cell assembly.

[0010] In one or more of the above optional embodiments, the bracket includes a first recess, the first recess being located on a side of the bracket away from the battery cell assembly. The battery pack includes a first conductive member connected to the battery cell assembly, at least a portion of the first conductive member being located in the first recess. A second gap is defined between the first conductive member and the bracket, the first bracket opening is in communication with the second gap, and the passage includes the second gap.

[0011] By providing the second gap, the risk of the first conductive member completely filling the first recess can be reduced, the obstruction of the first conductive member to the discharged substances can be reduced, and the safety performance can be improved.

[0012] In one or more optional embodiments above, the first conductive member is configured to transmit power of the battery cell assembly. Optionally, the first conductive member is connected to the total negative terminal of the battery cell assembly.

[0013] In one or more of the above optional embodiments, the battery pack includes a sampling assembly configured to transmit electrical signals from the battery cell assembly. Along the second direction, the first conductive member and the sampling assembly are positioned opposite each other, with at least a portion of the sampling assembly located on a side of the bracket away from the battery cell assembly. The bracket separates the first conductive member and the sampling assembly to reduce mutual interference.

[0014] In one or more of the above optional embodiments, the first conductive member is closer to the second pressure relief portion than to the sampling assembly. When the first pressure relief portion is activated, the flow of material through the sampling assembly is reduced, thereby reducing the risk of damage to the sampling assembly and improving the safety performance of the battery pack.

[0015] In one or more of the above optional embodiments, a second opening is formed between the first insulating member and two adjacent battery cells, the second opening communicating with the first gap. The battery pack includes a bus assembly connecting the adjacent battery cells, the bus assembly extending from the second opening and connected to the sampling assembly. The provision of the second opening facilitates extending the bus assembly outside the first insulating member, thereby establishing a connection between the sampling assembly and the bus assembly.

[0016] 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. 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 connection portion, and the second busbar includes a second main body, a second extension and a second connection portion. In the first direction, the first insulating member, the second main body and the first main body are arranged in an array. In two adjacent battery cells, the first extension is connected to the first electrical connection end of one battery cell, and the second extension is connected to the second electrical connection end of the other battery cell. The first connection portion and the second connection portion are led out from the second opening and connected to the sampling assembly.

[0017] In one or more optional embodiments above, the bracket is provided with a second bracket opening, and the busbar assembly passes through the second bracket opening and is connected to the sampling assembly.

[0018] In one or more optional embodiments above, the bracket is provided with a second recess, at least part of the sampling assembly is provided in the second recess, a third gap is provided between the sampling assembly and the housing, and the second bracket opening is connected to the third gap and the second opening.

[0019] When the first pressure relief part is activated, the material in the first gap can be discharged through the first opening and the second opening. Part of the material discharged from the second opening can flow to the second pressure relief part through the second opening and the third gap, thereby improving discharge efficiency.

[0020] In one or more of the above optional embodiments, the bracket includes a first bracket and a second bracket arranged along the second direction. The first bracket opening is provided in the first bracket. The first conductive member is located on a side of the first bracket facing away from the battery cell assembly, and the sampling assembly is located on a side of the second bracket facing away from the battery cell assembly.

[0021] In one or more optional embodiments above, the width of the first recess is W1, and the width of the first conductive member is W2, and W1 is greater than W2, so as to reserve a second gap between the bracket and the first conductive member to prevent the first conductive member from completely filling the first recess and improve the discharge efficiency.

[0022] In one or more of the above optional embodiments, the first conductive member covers a portion of the first opening, which can reduce the obstruction of the first conductive member to the discharge of substances and improve safety performance.

[0023] In one or more optional embodiments above, the first insulating member includes a main body portion in the first direction, and the main body portion is arranged between adjacent battery cells.

[0024] In one or more of the above optional embodiments, in two adjacent battery cells, in a first direction, the main body is disposed between the bottom wall of one battery cell and the top wall of the other battery cell. The first insulating member separates the bottom wall of one battery cell from the top wall of the other battery cell, thereby reducing the risk of a short circuit between the two adjacent battery cells.

[0025] In one or more of the above optional embodiments, the battery pack includes an adhesive member, and the battery cell assembly, the bracket and the shell are bonded together by the adhesive member.

[0026] In one or more of the above optional embodiments, both the first gap and the first opening are provided with air channels, and the two air channels are connected.

[0027] In one or more of the above optional embodiments, the first gap, the first opening, and the channel are all provided with air channels, and the three air channels are interconnected.

[0028] In a second aspect, the present application provides a battery pack comprising a cell assembly, a shell, and a first insulating member. The cell assembly is housed in the shell, the cell assembly comprising a plurality of cells arranged along a first direction, the cells comprising a first pressure relief portion. In the first direction, the first insulating member is disposed between adjacent cells. There is a first gap between the first insulating member and one of the cells, the first pressure relief portion of the cell being exposed in the first gap, the first insulating member being provided with a first opening, and the first gap and the first opening being configured to provide a pressure relief channel for the cell. The battery pack further comprises a second pressure relief portion disposed in the shell.

[0029] In one or more optional embodiments above, other structural components are provided in the first gap. When the first pressure relief portion is activated, the material discharged from the battery cell causes the structural component to deform to form a pressure relief channel, or the material discharged from the battery cell discharges the structural component out of the shell.

[0030] In one or more optional embodiments above, other structural components are provided in the first opening. When the first pressure relief portion is activated, the material discharged from the battery cell deforms the structural component to form a pressure relief channel, or the material discharged from the battery cell discharges the structural component out of the shell.

[0031] In one or more of the above optional embodiments, the battery pack includes a bracket, the bracket being housed within the housing, and the battery cell assembly being housed within the bracket. The bracket includes a first bracket opening, the first bracket opening extending through the bracket and communicating with the first opening. A passage exists between the bracket and the housing, and the first bracket opening communicates with the passage and the first opening.

[0032] In one or more of the above optional embodiments, the bracket includes a first recess, the first recess being located on a side of the bracket away from the battery cell assembly. The battery pack includes a first conductive member connected to the battery cell assembly, at least a portion of the first conductive member being located in the first recess. A second gap is defined between the first conductive member and the bracket, the first bracket opening is in communication with the second gap, and the passage includes the second gap.

[0033] In one or more of the above optional embodiments, the first conductive member is configured to transmit power of the battery cell assembly.

[0034] In one or more of the above optional embodiments, the battery pack includes a sampling assembly configured to transmit electrical signals from the battery cell assembly. Along the second direction, the first conductive member and the sampling assembly are disposed opposite each other, with at least a portion of the sampling assembly located on a side of the bracket away from the battery cell assembly.

[0035] In one or more of the above optional embodiments, compared with the sampling assembly, the first conductive member is closer to the second pressure relief portion.

[0036] In one or more of the above optional embodiments, a second opening is formed between the first insulating member and two adjacent battery cells, the second opening communicating with the first gap. The battery pack includes a bus assembly connecting the adjacent battery cells, the bus assembly extending from the second opening and connected to the sampling assembly.

[0037] 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. 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 connection portion, and the second busbar includes a second main body, a second extension and a second connection portion. In the first direction, the first insulating member, the second main body and the first main body are arranged in an array. In two adjacent battery cells, the first extension is connected to the first electrical connection end of one battery cell, and the second extension is connected to the second electrical connection end of the other battery cell. The first connection portion and the second connection portion are led out from the second opening and connected to the sampling assembly.

[0038] In one or more optional embodiments above, the bracket is provided with a second bracket opening, and the busbar assembly passes through the second bracket opening and is connected to the sampling assembly.

[0039] In one or more optional embodiments above, the bracket is provided with a second recess, at least part of the sampling assembly is provided in the second recess, a third gap is provided between the sampling assembly and the housing, and the second bracket opening is connected to the third gap and the second opening.

[0040] In one or more of the above optional embodiments, the bracket includes a first bracket and a second bracket arranged along the second direction. The first bracket opening is provided in the first bracket. The first conductive member is located on a side of the first bracket facing away from the battery cell assembly, and the sampling assembly is located on a side of the second bracket facing away from the battery cell assembly.

[0041] In one or more optional embodiments above, the width of the first recess is W1, the width of the first conductive member is W2, and W1 is greater than W2.

[0042] In one or more of the above optional embodiments, the first conductive member covers a portion of the first opening.

[0043] In a third aspect, the present application provides an electrical device, which includes the battery pack provided in any embodiment of the first aspect or the battery pack provided in any embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] FIG1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0046] FIG2 is a schematic cross-sectional view of FIG1 taken along the EE direction;

[0047] FIG3 is a schematic diagram of an explosion of the battery pack shown in FIG1 ;

[0048] FIG4 is a schematic cross-sectional view of a battery cell and a first insulating member according to some embodiments of the present application;

[0049] FIG5 is an enlarged schematic diagram of the circle frame of FIG4;

[0050] FIG6 is a schematic cross-sectional view of a battery pack according to some embodiments of the present application;

[0051] FIG7 is an enlarged schematic diagram of the circle frame of FIG6;

[0052] FIG8 is an enlarged schematic diagram of the box in FIG6;

[0053] FIG9 is an enlarged schematic diagram of block A in FIG2 ;

[0054] FIG10 is an enlarged schematic diagram of FIG2 at the circle B;

[0055] FIG11 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0056] FIG12 is a schematic diagram of a partial structure of a battery pack provided by some embodiments of the present application;

[0057] FIG13 is a schematic diagram of an insulating member and a busbar assembly provided in some embodiments of the present application;

[0058] FIG14 is a schematic diagram of FIG13 viewed along a first direction;

[0059] FIG15 is a schematic structural diagram of an insulating member provided in some embodiments of the present application;

[0060] FIG16 is a schematic cross-sectional view taken along the FF direction of FIG14;

[0061] FIG17 is an enlarged schematic diagram of the circle frame of FIG16;

[0062] FIG18 is a schematic diagram of the battery cell shown in FIG11 after being connected to the first busbar;

[0063] FIG19 is a schematic structural diagram of a first bus provided in some embodiments of the present application;

[0064] FIG20 is a schematic structural diagram of a second bus provided in some embodiments of the present application;

[0065] FIG21 is a schematic diagram of a partial structure of a battery pack provided by some embodiments of the present application;

[0066] FIG22 is an enlarged schematic diagram of the circle frame of FIG21;

[0067] FIG23 is a schematic structural diagram of a second bracket provided in some embodiments of the present application;

[0068] FIG24 is a schematic diagram of a first bracket and a second conductive member provided in some embodiments of the present application;

[0069] FIG25 is an enlarged schematic diagram of the circle C in FIG2;

[0070] FIG26 is an enlarged schematic diagram of the circle D in FIG2;

[0071] FIG27 is a schematic partial cross-sectional view of a battery pack provided in some other embodiments of the present application.

[0072] The reference numerals for the specific embodiments are as follows: DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] The battery pack and electrical equipment of the present application are described below with reference to the accompanying drawings.

[0078] 1 to 27 , an embodiment of the present application provides a battery pack including a housing 2 and a cell assembly 1 accommodated in the housing 2 .

[0079] In some embodiments, the housing 2 may be a square housing, a cylindrical housing, or a housing of other shapes. 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 molded housing or a housing composed of multiple independently molded components.

[0080] In some embodiments, the housing 2 is a metal housing, which has relatively high strength.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In some embodiments, the plurality of battery cells 11 are arranged along a first direction Z. Optionally, referring to FIG. 3 , 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.

[0086] 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.

[0087] In some embodiments, the battery cell 11 includes a battery cell case 111 and an electrode terminal 112 .

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 .

[0095] 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.

[0096] 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 .

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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. Among the adjacent battery cells 11 , a first gap G1 exists between the first insulating member 6 and one of the battery cells 11 .

[0101] 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 .

[0102] 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 .

[0103] In some embodiments, in two adjacent battery cells 11, the main body 61 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, thereby reducing the risk of a short circuit between the two adjacent battery cells 11.

[0104] In some embodiments, in 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 main body 61, 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.

[0105] In some embodiments, the first insulating member 6 includes a main body portion 61 and a first protrusion 62 . In the first direction Z, the first protrusion 62 protrudes from the main body portion 61 .

[0106] 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 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 the adjacent battery cells 11.

[0107] 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 11, 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.

[0108] 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.

[0109] In some embodiments, the battery cell 11 is a cylindrical battery cell, and the main body 61 is circular. Referring to FIG. 14 , 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°.

[0110] In some embodiments, the first protrusion 62 is disposed along an edge of the main body 61 .

[0111] 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 .

[0112] 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 .

[0113] For example, 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.

[0114] 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.

[0115] In some embodiments, in two adjacent battery cells 11 , at least a portion of the first protrusion 62 is located outside the sidewall 1112 of one of the battery cells 11 , and a first gap G1 is formed between the main body 61 and the battery cell 11 .

[0116] In some embodiments, the battery pack includes a busbar assembly 3 , which connects adjacent battery cells 11 .

[0117] 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 terminal 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 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.

[0118] 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 .

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] In some embodiments, the first busbar 31 includes a first main portion 311 , a first extending portion 312 , and a first connecting portion 313 , and the second busbar 32 includes a second main portion 321 , a second extending portion 322 , and a second connecting portion 323 .

[0124] In some embodiments, the first insulating member 6 , the second main body 321 , and the first main body 311 are arranged in a row in the first direction Z. In two adjacent battery cells 11 , the first extension 312 is connected to one battery cell 11 , and the second extension 322 is connected to the other battery cell 11 .

[0125] In some embodiments, the main body portion 61 , the second main body portion 321 and the first main body portion 311 are stacked in the first direction Z. The first and second main body portions 311 and 321 may share space with the first convex portion 62 in the first direction Z, thereby improving space utilization.

[0126] In some embodiments, in the first direction Z, in two adjacent battery cells 11, the first insulating member 6 is located between the second busbar 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 busbar 32, thereby reducing the risk of short circuit of the same battery cell 11.

[0127] 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. Exemplarily, in two adjacent battery cells 11, the bottom wall 1111 of each battery cell 11 is the first electrical connection end, the electrode terminal 112 is the second electrical connection end, 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.

[0128] In some embodiments, along the first direction Z, the first extension portion 312 and the second extension portion 322 are located between adjacent battery cells 11 .

[0129] In some embodiments, the first extending portion 312 and the first connecting portion 313 are connected to the first main body portion 311 .

[0130] 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.

[0131] In some embodiments, the second extending portion 322 and the second connecting portion 323 are connected to the first main body portion 311 .

[0132] 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.

[0133] 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.

[0134] 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 the first portion 3121 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 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 connected to the first extension portion 312, relative to the first main portion 311.

[0135] 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.

[0136] 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 11 connected to the first extension portion 312. Exemplarily, the third 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.

[0137] 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.

[0138] 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.

[0139] 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 .

[0140] 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.

[0141] 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 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 is connected to the first electrical connection end of that battery cell 11; the fourth protrusion 3222 protrudes toward the second electrical connection end of the other battery cell 11 and is connected to the second electrical connection end of that 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.

[0142] 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.

[0143] In some embodiments, the fourth protrusion 3222 is welded to the electrode terminal 112 .

[0144] 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 .

[0145] In some embodiments, the main body 61 is provided with a third opening 611 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 611 and connects to the other battery cell 11. The provision of the third opening 611 allows the second extension 322 to be avoided, thereby enabling connection between the second extension 322 and the other battery cell 11.

[0146] In some embodiments, in two adjacent battery cells 11 , the second extension portion 322 passes through the third opening 611 and is connected to the electrode terminal 112 of the other battery cell 11 .

[0147] In some embodiments, in two adjacent battery cells 11 , the fourth protrusion 3222 passes through the third opening 611 and is connected to the electrode terminal 112 of the other battery cell 11 .

[0148] 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 .

[0149] In some embodiments, at least a portion of the first extension portion 312 is located in the third opening 611. The first extension portion 312 can utilize the space of the third opening 611, thereby improving space utilization, reducing the size of the battery pack in the first direction Z, and improving the energy density of the battery pack.

[0150] In some embodiments, the first portion 3121 is at least partially located in the third opening 611 .

[0151] In some embodiments, the second portion 3122 is at least partially located in the third opening 611 .

[0152] In some embodiments, the third protrusion 3123 is at least partially located in the third opening 611.

[0153] In some embodiments, the battery cell 11 includes a first pressure relief portion 114. When an abnormality occurs in the battery cell 11, the first pressure relief portion 114 is activated to form a first pressure relief port, through which the contents of the battery cell 11 can be discharged to the outside of the battery cell 11, thereby reducing the risk of explosion of the battery cell 11.

[0154] In some examples, the first pressure relief portion 114 is integrally formed with the cell housing 111. In alternative examples, the first pressure relief portion 114 and the cell housing 111 are formed independently and connected by bonding, welding, or other processes. Optionally, the first pressure relief portion 114 may include a pressure relief valve.

[0155] In some embodiments, the first 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 first pressure relief portion 114 activates or a weak structure within the first pressure relief portion 114 is destroyed, thereby forming a first pressure relief port for releasing the internal pressure or temperature.

[0156] In some embodiments, a first gap G1 exists between the first insulating member 6 and one of the battery cells 11. The first pressure relief portion 114 of the battery cell 11 is exposed in the first gap G1.

[0157] The first pressure relief portion 114 is activated to form a first pressure relief port (not shown), which relieves pressure through the first gap G1.

[0158] In some embodiments, the first pressure relief portion 114 is disposed on the battery cell housing 111 .

[0159] In some embodiments, the first insulating member 6 is provided with a first opening S1 , and the first gap G1 is connected to the first opening S1 . The first opening S1 is connected to the outside of the battery cell assembly 1 .

[0160] When the first pressure relief portion 114 is activated due to an abnormality in the battery cell 11 (such as a short circuit, collision or other situations), the internal material of the battery cell 11 is discharged into the first gap G1 through the first pressure relief portion 114, and then discharged to the outside of the battery cell assembly 1 through the first opening S1, thereby improving the safety of the battery cell assembly 1.

[0161] In some embodiments, the first gap G1 and the first opening S1 are configured to provide a pressure relief channel for the battery cell 11. When the first pressure relief portion 114 is activated due to an abnormality in the battery cell 11, substances discharged from the battery cell 11 through the first pressure relief portion 114 are discharged to the outside of the battery cell assembly 1 through the first gap G1 and the first opening S1.

[0162] In some embodiments, other structural components are disposed within the first gap G1. When the first pressure relief portion 114 is activated, material discharged from the battery cells 11 deforms the structural component to form a pressure relief passage, or material discharged from the battery cells 11 discharges the structural component out of the housing 2. For example, foam with a low melting point is disposed within the first gap G1. When the first pressure relief portion 114 is activated, high-temperature material discharged from the battery cells 11 causes the foam to melt or shrink, forming a pressure relief passage. For example, when the first pressure relief portion 114 is activated, high-temperature material discharged from the battery cells 11 discharges the structural component out of the housing 2, forming a pressure relief passage.

[0163] In some embodiments, other structural components are disposed within the first opening S1. When the first pressure relief portion 114 is activated, material discharged from the battery cell 11 deforms the structural component to form a pressure relief passage, or material discharged from the battery cell 11 discharges the structural component out of the housing 2. For example, foam with a low melting point is disposed within the first opening S1. When the first pressure relief portion 114 is activated, high-temperature material discharged from the battery cell 11 causes the foam to melt or shrink, forming a pressure relief passage. For example, when the first pressure relief portion 114 is activated, high-temperature material discharged from the battery cell 11 discharges the structural component out of the housing 2, forming a pressure relief passage.

[0164] In some embodiments, the battery pack further includes a second pressure relief portion 10 d . The second pressure relief portion 10 d is disposed on the housing 2 .

[0165] In some embodiments, the second pressure relief portion 10d may be a pressure-sensitive or temperature-sensitive element. When the internal pressure or temperature of the housing 2 reaches a threshold, the second pressure relief portion 10d is activated or a weak structure in the second pressure relief portion 10d is destroyed, thereby forming a pressure relief port for releasing the internal pressure or temperature.

[0166] In some embodiments, the second pressure relief portion 10 d may be an opening provided on the housing 2 , and the opening passes through the housing 2 .

[0167] In some embodiments, the battery pack further includes a protective film connected to the housing 2. The protective film is disposed outside and covers the second pressure relief portion 10d. Optionally, the protective film comprises a waterproof and breathable film. When the first pressure relief portion 114 is activated, the material discharged from the first pressure relief portion 114 may separate at least a portion of the protective film from the housing 2, and the material discharged from the first pressure relief portion 114 flows to the exterior of the housing 2.

[0168] In some embodiments, the second pressure relief portion 10d includes a pressure relief valve.

[0169] In some embodiments, the pressure relief path of the battery pack includes a first gap G1, a first opening S1, and a second pressure relief portion 10d. The substances discharged from the first pressure relief portion 114 are discharged through the pressure relief path. Optionally, the substances discharged from the first pressure relief portion 114 flow directly to the second pressure relief portion 10d through the first gap G1 and the first opening S1, and then are discharged through the second pressure relief portion 10d, thereby improving the safety of the battery pack. Optionally, the substances discharged from the first pressure relief portion 114 are discharged directly to the outside of the housing 2 through the second pressure relief portion 10d. Optionally, the substances discharged from the first pressure relief portion 114 separate at least a portion of the protective film from the housing 2, and the substances discharged from the first pressure relief portion 114 flow to the outside of the housing 2.

[0170] 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.

[0171] 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 .

[0172] 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 .

[0173] 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 and reliability of the battery pack.

[0174] 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.

[0175] 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 .

[0176] 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.

[0177] In some embodiments, the bracket 5 includes a first bracket opening 512 , which passes through the bracket 5 and is communicated with the first opening S1 .

[0178] Optionally, the number of the first bracket openings 512 and the first openings S1 are the same, and the first bracket openings 512 and the first openings S1 are arranged in a one-to-one correspondence.

[0179] In some embodiments, the first bracket opening 512 is opposite to the first opening S1 along the second direction Y, which is beneficial for accelerating the discharge of substances from the battery cell 11 .

[0180] In some embodiments, a passage P exists between the bracket 5 and the housing 2 , and the first bracket opening 512 connects the passage P and the first opening S1 , thereby reducing the obstruction of the bracket 5 to the high-temperature gas and improving the exhaust efficiency.

[0181] Exemplarily, there are a plurality of first insulating members 6 and a plurality of first openings S1 , and the channel P is connected to the plurality of first openings S1 .

[0182] In some embodiments, the first opening S1 passes through the first protrusion 62 along the second direction Y.

[0183] In some embodiments, the pressure relief path of the battery pack includes a first gap G1, a first opening S1, a channel P, and a second pressure relief portion 10d. Substances discharged from the first pressure relief portion 114 are discharged through the pressure relief path. Optionally, substances discharged from the first pressure relief portion 114 flow through the first gap G1, the first opening S1, and the channel P to the second pressure relief portion 10d, and then are discharged through the second pressure relief portion 10d, thereby improving the safety of the battery pack. Optionally, substances discharged from the first pressure relief portion 114 are discharged directly to the outside of the housing 2 through the second pressure relief portion 10d. Optionally, substances discharged from the first pressure relief portion 114 separate at least a portion of the protective film from the housing 2, and substances discharged from the first pressure relief portion 114 flow to the outside of the housing 2.

[0184] In some embodiments, the first bracket opening 512 is disposed on the first bracket 51 .

[0185] In some embodiments, the first bracket opening 512 is rectangular.

[0186] In some embodiments, the bracket 5 includes a first recess 513 , which is located on a side of the bracket 5 away from the battery cell assembly 1 . Exemplarily, the first bracket opening 512 passes through the first recess 513 .

[0187] In some embodiments, the battery pack includes a first conductive member 10, which is connected to the battery cell assembly 1. At least a portion of the first conductive member 10 is disposed within the first recess 513. The first recess 513 provides space for the first conductive member 10, thereby improving space utilization and reducing the risk of interference between the first conductive member 10 and the housing 2. When installing the first conductive member 10, the first recess 513 serves as a positioning mechanism, facilitating assembly of the first conductive member 10.

[0188] In some embodiments, a second gap G2 is defined between the first conductive member 10 and the bracket 5 , the first bracket opening 512 is in communication with the second gap G2 , and the channel P includes the second gap G2 .

[0189] By providing the second gap G2 , the risk of the first conductive member 10 completely filling the first recess 513 can be reduced, the obstruction of the first conductive member 10 to the discharged substances can be reduced, and the safety performance can be improved.

[0190] In some embodiments, the first recess 513 has a bottom surface and two side surfaces. Optionally, the first conductive member 10 abuts against one side surface, forming a second gap G2 between the first conductive member 10 and the other side surface; alternatively, a second gap G2 is formed between the first conductive member 10 and both side surfaces.

[0191] In some embodiments, the first conductive member 10 is configured to transmit power from the battery cell assembly 1. Optionally, the first conductive member 10 is connected to the common negative terminal of the battery cell assembly 1. When the battery pack is discharging, the battery pack's electrical energy can be transmitted to the load of the electrical device through the first conductive member 10 to power the load of the electrical device. When the battery pack is charging, external electrical energy can be transmitted to the battery module through the first conductive member 10 to charge the battery pack.

[0192] In some embodiments, the first 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.

[0193] In some embodiments, the first conductive member 10 covers a portion of the first opening S1 , which can reduce the obstruction of the first conductive member 10 on the discharged substances and improve safety performance.

[0194] For example, the first conductive member 10 is a metal member. When an abnormality occurs in the battery cell 11, the metal member can collide with the sparks generated by the battery cell 11, thereby extinguishing the sparks.

[0195] In some embodiments, the width of the first recess 513 is W1, and the width of the first conductive member 10 is W2, where W1 is greater than W2, so as to reserve a second gap G2 between the bracket 5 and the first conductive member 10 to prevent the first conductive member 10 from completely filling the first recess 513 and improve the discharge efficiency.

[0196] Exemplarily, W1-W2 is greater than or equal to 0.5 mm, for example, W1-W2 is 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, or 2 mm.

[0197] In some embodiments, the battery pack includes a sampling assembly 4, which is configured to transmit an electrical signal 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.

[0198] In some embodiments, the sampling assembly 4 is connected to the bus assembly 3 .

[0199] In some embodiments, along the second direction Y, the first conductive member 10 and the sampling assembly 4 are disposed opposite each other, and at least a portion of the sampling assembly 4 is located on a side of the bracket 5 away from the battery cell assembly 1. The bracket 5 separates the first conductive member 10 and the sampling assembly 4 to reduce mutual interference.

[0200] 27 , the first conductive member 10 is closer to the second pressure relief portion 10d than the sampling assembly 4. When the first pressure relief portion 114 is activated, the flow of substances through the sampling assembly 4 is reduced, thereby lowering the risk of damage to the sampling assembly 4 and improving the safety of the battery pack.

[0201] In some embodiments, 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 the base 41 along a first direction Z. Each conductive portion 42 is connected to a group of busbar assemblies 3 . For example, each conductive portion 42 connects the first busbar 31 and the second busbar 32 of each group of busbar assemblies 3 .

[0202] 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.

[0203] 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 the adjacent 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.

[0204] 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.

[0205] 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 .

[0206] In some embodiments, the second connection portion 323 , the first connection portion 313 , and the conductive portion 42 are welded.

[0207] In some embodiments, in two adjacent battery cells 11 , a first gap G1 exists between the first insulating member 6 and one of the battery cells 11 , and a second opening S2 is formed between the first insulating member 6 and the battery cell 11 , the second opening S2 being connected to the first gap G1 .

[0208] In some embodiments, a portion of the busbar assembly 3 is disposed in the first gap G1 , reducing the space occupied by the busbar assembly 3 in the first direction Z.

[0209] In some embodiments, the busbar assembly 3 connects adjacent battery cells 11, and the busbar assembly 3 is led out of the second opening S2 and connected to the sampling assembly 4. The provision of the second opening S2 facilitates leading the busbar assembly 3 to the outside of the first insulating member 6, thereby achieving connection between the sampling assembly 4 and the busbar assembly 3.

[0210] The first insulating member 6 can restrict external impurities from entering the first gap G1 , thereby reducing the risk of interference between the busbar assembly 3 and the battery cell 11 by external impurities and improving the reliability of the battery pack.

[0211] In some embodiments, the first protrusion 62, the main body 61, and the battery cell 11 abutting against the first protrusion 62 form a second opening S2. The main body 61 and the battery cell 11 define the second opening S2, which can increase the size of the second opening S2 along the first direction Z, facilitating the extraction of the busbar assembly 3.

[0212] In some embodiments, the first connection portion 313 and the second connection portion 323 are led out from the second opening S2 and connected to the sampling assembly 4 .

[0213] The first busbar 31 and the second busbar 32 pass through the second opening S2 , so that the first connection portion 313 and the second connection portion 323 are led out to the outside of the first insulating member 6 .

[0214] In some embodiments, the bracket 5 is provided with a second bracket opening 521 , and the bus assembly 3 passes through the second bracket opening 521 and is connected to the sampling assembly 4 .

[0215] The first busbar 31 and the second busbar 32 pass through the second bracket opening 521 and are connected to the conductive portion 42. The second bracket opening 521 facilitates the first busbar 31 and the second busbar 32 to pass through the second bracket 52, thereby achieving connection between the conductive portion 42, the first busbar 31, and the second busbar 32.

[0216] In some embodiments, the second opening S2 and the second bracket opening 521 are arranged opposite to each other along the second direction Y, which facilitates the first busbar 31 to pass through the second opening S2 and the second bracket opening 521 in sequence, and facilitates the second busbar 32 to pass through the second opening S2 and the second bracket opening 521 in sequence.

[0217] In some embodiments, there are multiple second bracket openings 521 , and the multiple second 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 second bracket opening 521 .

[0218] Optionally, the number of the second bracket openings 521 is the same as the number of the busbar assemblies 3 , and the second bracket openings 521 and the busbar assemblies 3 are arranged in a one-to-one correspondence.

[0219] In some embodiments, the bracket 5 is provided with a second recess 522 , and at least a portion of the sampling assembly 4 is provided in the second recess 522 .

[0220] The second recess 522 can provide a space for the sampling assembly 4, thereby improving space utilization and reducing the risk of interference between the sampling assembly 4 and other components. When installing the sampling assembly 4, the second recess 522 can play a positioning role, facilitating the assembly of the sampling assembly 4.

[0221] In some embodiments, a third gap G3 is defined between the sampling assembly 4 and the housing 2 , and the second bracket opening 521 communicates with the third gap G3 and the second opening S2 .

[0222] When the first pressure relief portion 114 is activated, the material in the first gap G1 can be discharged through the first opening S1 and the second opening S2. A portion of the material discharged from the second opening S2 can flow to the second pressure relief portion 10d through the third gap G3, thereby improving discharge efficiency.

[0223] In some embodiments, the second bracket opening 521 is disposed on the second bracket 52 .

[0224] In some embodiments, the first conductive member 10 is located on a side of the first bracket 51 facing away from the battery cell assembly 1 .

[0225] 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 .

[0226] In some embodiments, the second bracket 52 defines a second recess 522 .

[0227] In some embodiments, the second bracket 52 is provided with a third bracket opening 523. The sampling assembly 4 includes a sampling portion 43 connected to the base 41. The sampling portion 43 passes through the third bracket opening 523 and is connected to one of the battery cell housings 111. The sampling portion 43 may be single or multiple. The sampling portion 43 can be used to collect information about the battery cell 11, such as temperature. The provision of the third bracket opening 523 facilitates direct connection of the sampling portion 43 to the battery cell 11, thereby improving the accuracy of the sampling performed by the sampling portion 43.

[0228] In some embodiments, the sampling unit 43 is used to collect the temperature of the battery cell 11 .

[0229] 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.

[0230] In some embodiments, the sampling unit 43 includes an NTC (Negative Temperature Coefficient) temperature sensor.

[0231] In some embodiments, there are multiple third bracket openings 523 and multiple sampling portions 43 . The multiple third 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.

[0232] Optionally, the number of the third bracket openings 523 and the number of the sampling portions 43 are the same, and the third bracket openings 523 and the sampling portions 43 are arranged in a one-to-one correspondence.

[0233] In some embodiments, the base 41 can collect the voltage of the battery cell 11 through the conductive portion 42 .

[0234] 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.

[0235] In some embodiments, the battery pack includes a second insulating member 44 , which is disposed between the base 41 and the housing 2 ; the second insulating member 44 is connected to the base 41 and covers the plurality of conductive portions 42 .

[0236] The second 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.

[0237] 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.

[0238] In some embodiments, the second opening S2 , the second 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 second opening S2 , the second bracket opening 521 , and the fourth opening 411 in sequence.

[0239] In some embodiments, there are multiple fourth openings 411 , and the number of the first openings 411 is the same as the number of the first opening brackets 521 . The multiple fourth openings 411 and the multiple second bracket openings 521 are arranged in a one-to-one correspondence.

[0240] In some embodiments, the battery cell assembly 1 is bonded to the first bracket 51 and / or the second bracket 52 .

[0241] 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.

[0242] 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 battery cell assembly 1 to the first bracket 51 .

[0243] Optionally, each battery cell 11 is bonded to the first bracket 51 via colloid.

[0244] 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.

[0245] In some embodiments, the battery pack includes an adhesive 7, and the battery cell assembly 1, the bracket 5 and the shell 2 are bonded 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.

[0246] In some embodiments, the battery cell assembly 1 is disposed in the bracket 5 . The bracket 5 includes a fourth bracket opening 53 , and at least a portion of the adhesive member 7 is disposed in the fourth bracket opening 53 .

[0247] In some embodiments, the fourth bracket opening 53 is configured to allow insulating material to flow into the bracket 5 through the fourth bracket opening 53, and the insulating material is cured to form the adhesive member 7. Optionally, the insulating material includes glue.

[0248] 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.

[0249] In some embodiments, the adhesive member 7 is made of insulating material.

[0250] In some embodiments, the fourth 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.

[0251] In some embodiments, the first bracket 51 has a third recess 511 , the second bracket 52 has a fourth recess 524 , and the third recess 511 and the fourth recess 524 are opposite to each other along the second direction Y and form a fourth bracket opening 53 .

[0252] In some embodiments, there are multiple fourth bracket openings 53. For example, both sides of the bracket 5 along the third direction X are provided with fourth bracket openings 53.

[0253] 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 fourth 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.

[0254] 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.

[0255] In some embodiments, there are multiple first housing openings 21 .

[0256] In some embodiments, each fourth 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.

[0257] In some embodiments, at least part of the adhesive 7 in the pressure relief path of the battery pack is separated, reducing the barrier of the adhesive 7 to the discharged substances. Optionally, no adhesive 7 is provided in the pressure relief path.

[0258] In some embodiments, the first gap G1 and the first opening S1 are both provided with air channels, the two air channels are connected, and the substances discharged from the first pressure relief portion 114 are discharged through the two air channels.

[0259] In some embodiments, the second pressure relief portion 10 d is exposed to the air passage of the first opening S1 , which is beneficial to the discharge of the first pressure relief portion 114 .

[0260] In some embodiments, the first gap G1 , the first opening S1 , and the channel P are all provided with air channels, and the three air channels are interconnected. The substances discharged from the first pressure relief portion 114 are discharged through the three air channels.

[0261] In some embodiments, the second pressure relief portion 10 d is exposed to the air passage of the channel P, which is beneficial to the discharge of the first pressure relief portion 114 .

[0262] In some embodiments, at least a portion of the first gap G1 is separated from the adhesive member 7, and when the first pressure relief portion 114 is activated, the adhesive member 7 reduces the barrier to the discharged material. Optionally, the adhesive member 7 is not provided in the first gap G1.

[0263] In some embodiments, at least a portion of the first pressure relief portion 114 is separated from the adhesive member 7 , and when the first pressure relief portion 114 is activated, the adhesive member 7 reduces the barrier to the discharge of substances.

[0264] In some embodiments, at least a portion of the first opening S1 is separated from the adhesive member 7, and when the first pressure relief portion 114 is activated, the adhesive member 7 reduces the barrier to the discharge of substances. Optionally, the first opening S1 is not provided with the adhesive member 7.

[0265] In some embodiments, at least a portion of the first bracket opening 512 is separated from the adhesive member 7 , and when the first pressure relief portion 114 is activated, the adhesive member 7 reduces the barrier to the discharge of substances.

[0266] In some embodiments, at least a portion of the channel P is separated from the adhesive member 7, and when the first pressure relief portion 114 is activated, the adhesive member 7 reduces the barrier to the discharge of the substance.

[0267] In some embodiments, the battery pack includes a circuit board assembly 8 and a second 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. One end of the second conductive member 9 is connected to the battery cell 11 closest to the circuit board assembly 8, and the other end of the second conductive member 9 extends out of the bracket 5 and is connected to the circuit board assembly 8.

[0268] Exemplarily, the second conductive member 9 is configured to transmit power of the battery cell assembly 1. For example, the second conductive member 9 is connected to the total positive terminal of the battery cell assembly 1.

[0269] In some embodiments, the circuit board assembly 8 includes a first circuit board 81, and the sampling assembly 4 and the second conductive member 9 are both connected to the first circuit board 81. Exemplarily, the first circuit board 81 may include a printed circuit board or a flexible circuit board.

[0270] In some embodiments, the second 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 second conductive member 9 is connected to the total positive terminal of the battery cell assembly 1.

[0271] In some embodiments, the first conductive member 10 is connected to the bottom wall 1111 of the battery cell 11 farthest from the circuit board assembly 8 .

[0272] In some embodiments, the circuit board assembly 8 includes a second circuit board 82, and the first 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. Optionally, the sampling assembly 4 is connected to the second circuit board 82. Optionally, the second conductive member 9 is connected to the second circuit board 82.

[0273] In some embodiments, the first circuit board 81 and the second circuit board 82 are arranged along the first direction Z.

[0274] In some embodiments, the second circuit board 82 includes a BMS (Battery Management System) component.

[0275] 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.

[0276] 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.

[0277] In some embodiments, the battery pack includes a fixing member 10 a , which connects the second housing 22 and the bracket 5 to improve the overall strength of the battery pack.

[0278] In some embodiments, the fixing member 10a includes a screw.

[0279] In some embodiments, the first housing 23 is an aluminum cylinder.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] In some embodiments, the electrical device may include an electric assisted bicycle.

[0285] 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.

[0286] 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 includes a plurality of battery cells arranged along a first direction, and the battery cells include a first pressure relief portion; a first insulating member, wherein at least a portion of the first insulating member is disposed between adjacent battery cells in the first direction, a first gap exists between the first insulating member and one of the battery cells, the first pressure relief portion of the battery cell is exposed in the first gap, the first insulating member is provided with a first opening, the first gap is in communication with the first opening, and the first opening is in communication with the exterior of the battery cell assembly; The second pressure relief portion is arranged on the shell.

2. The battery pack according to claim 1, wherein: The battery pack includes a bracket, the bracket is accommodated in the shell, and the battery cell assembly is accommodated in the bracket; The bracket includes a first bracket opening, the first bracket opening passes through the bracket, and the first bracket opening is communicated with the first opening; A channel is provided between the bracket and the housing, and the first bracket opening is connected to the channel and the first opening.

3. The battery pack according to claim 2, wherein: The bracket includes a first recess, and the first recess is provided on a side of the bracket away from the battery cell assembly; The battery pack includes a first conductive member connected to the battery cell assembly, and at least a portion of the first conductive member is disposed in the first recess; A second gap is defined between the first conductive member and the bracket, the first bracket opening is in communication with the second gap, and the channel includes the second gap.

4. The battery pack according to claim 3, wherein: The first conductive member is configured to transmit power of the battery cell assembly.

5. The battery pack according to claim 3 or 4, characterized in that: The battery pack includes a sampling component configured to transmit an electrical signal of the battery cell assembly; Along the second direction, the first conductive member and the sampling assembly are arranged opposite to each other, and at least a portion of the sampling assembly is located on a side of the bracket away from the battery core assembly.

6. The battery pack according to claim 5, characterized in that Compared with the sampling assembly, the first conductive member is closer to the second pressure relief portion.

7. The battery pack according to claim 5 or 6, characterized in that: In two adjacent battery cells, a second opening is formed between the first insulating member and the battery cell, and the second opening is connected to the first gap; The battery pack includes a bus assembly, which connects the adjacent battery cells. The bus assembly is led out from the second opening and connected to the sampling assembly.

8. The battery pack according to claim 7, wherein: The battery cell comprises a first electrical connection end and a second electrical connection end arranged opposite to each other in the first direction; 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 first insulating member, the second main body portion and the first main body portion are arranged in an aligned manner; In two adjacent battery cells, the first extension portion is connected to the first electrical connection end of one of the battery cells, and the second extension portion is connected to the second electrical connection end of the other battery cell; The first connecting portion and the second connecting portion are led out from the second opening and connected to the sampling assembly.

9. The battery pack according to claim 7 or 8, characterized in that: The bracket is provided with a second bracket opening, and the busbar assembly passes through the second bracket opening and is connected to the sampling assembly.

10. The battery pack according to claim 9, characterized in that The bracket is provided with a second recess, and at least a portion of the sampling assembly is provided in the second recess; A third gap is defined between the sampling assembly and the housing, and the second bracket opening communicates with the third gap and the second opening.

11. The battery pack according to any one of claims 5 to 10, characterized in that: The bracket includes a first bracket and a second bracket arranged along the second direction; The first bracket opening is provided on the first bracket; The first conductive member is located on a side of the first bracket facing away from the battery core assembly, and the sampling assembly is located on a side of the second bracket facing away from the battery core assembly.

12. The battery pack according to any one of claims 3 to 11, characterized in that: The width of the first recess is W1, the width of the first conductive member is W2, and W1 is greater than W2.

13. The battery pack according to any one of claims 3 to 12, characterized in that: The first conductive member covers a portion of the first opening.

14. A battery pack, characterized in that: include: case; A battery cell assembly is accommodated in the housing, the battery cell assembly includes a plurality of battery cells arranged along a first direction, and the battery cells are provided with a first pressure relief portion; a first insulating member, wherein the first insulating member is disposed between adjacent battery cells in the first direction, a first gap is present between the first insulating member and one of the battery cells, the first pressure relief portion of the battery cell is exposed in the first gap, the first insulating member is provided with a first opening, and the first gap and the first opening are configured to provide a pressure relief channel for the battery cell; The second pressure relief portion is arranged on the shell.

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

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