Battery module, battery pack and electric equipment

Abstract

The invention discloses a battery module, a battery pack and electric equipment. The battery module comprises a shell, a battery cell assembly, an elastic part and a first wire harness, the battery cell assembly comprises a plurality of battery cell units, and the battery cell units comprise first battery cell units. The elastic piece and the battery core assembly are arranged along a first direction; and the first battery cell unit is closer to the elastic piece than other battery cell units. The first wire harness is connected with the first battery cell unit to form a first connection point; the first wire harness is fixed on the elastic member to form a second connection point. The first wire harness includes a first segment located between the first connection point and the second connection point, the first segment being in a stretchable state. When the battery cell units are expanded or reduced in expansion, the first wire harness is in a stretchable state and moves along with the elastic piece, so that the pulling of the first wire harness can be reduced, the risk that the first wire harness is broken by pulling is reduced, and the safety of the battery module is improved.

Description

Battery modules, battery packs and electrical equipment Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery module, a battery pack and an electrical device. Background Art

[0002] Battery modules are currently widely used in drones, electric vehicles, smart energy storage devices, and other fields. However, current battery modules tend to expand during use, causing the battery cells to shift position. This can easily cause strain on the conductive components connecting the cells, affecting the battery module's performance.

[0003] Summary of the Invention

[0004] In view of this, it is necessary to provide a battery module, a battery pack and an electrical device that can help reduce the pulling of the first wiring harness and improve safety.

[0005] An embodiment of the present application provides a battery module, comprising a shell, a battery cell assembly, an elastic member and a first wiring harness. The battery cell assembly comprises a plurality of battery cell units, and the battery cell units comprise a first battery cell unit. The elastic member and the battery cell assembly are arranged along a first direction. The first battery cell unit is closer to the elastic member than the other battery cell units. The first wiring harness connects the first battery cell unit to form a first connection point. The first wiring harness is fixed to the elastic member to form a second connection point. The first wiring harness comprises a first section located between the first connection point and the second connection point, and the first section is in a stretchable state. When the battery cell unit expands or reduces in expansion, the first wiring harness is in a stretchable state and moves with the elastic member, thereby reducing the pulling on the first wiring harness, reducing the risk of the first wiring harness being broken, and improving the safety of the battery module.

[0006] In one or more of the above optional embodiments, at least a portion of the first section is in a bent state, which helps to reduce pulling on the first wire harness and lower the risk of the first wire harness being broken.

[0007] In one or more of the above optional embodiments, the straight-line distance between the first connection point and the second connection point is D1mm, and along the first direction, the natural length of the first segment is L1mm, where L1 is greater than D1, which further helps to reduce the pulling on the first wiring harness and reduce the risk of the first wiring harness being broken.

[0008] In one or more of the above optional embodiments, each battery cell unit includes a battery cell and a bracket, the battery cell includes electrode terminals, and the bracket connects the battery cells. The battery module also includes a first electrical connector. The first electrical connector is connected to the bracket of the first battery cell unit, the first electrical connector connects the battery cells, and the first wiring harness is connected to the battery cells of the first battery cell unit through the first electrical connector.

[0009] In one or more optional embodiments above, the first electrical connector includes a first section, a second section, and a third section. The first section is connected to the bracket, the second section is connected to the bracket, the third section is connected to the first section and the second section, and the electrode terminal is connected to the side of the third section away from the bracket. The first section includes a first inclined portion, and along the first direction, the third section is closer to the elastic member than the first inclined portion, which is beneficial to reducing the pulling on the electrode terminal. And / or, the second section includes a second inclined portion, and along the first direction, the third section is closer to the elastic member than the second inclined portion, which is beneficial to reducing the pulling on the electrode terminal.

[0010] In one or more optional embodiments above, the third section is separated from the bracket of the first battery cell unit, and an air gap exists between the third section and the bracket of the first battery cell unit, which is conducive to the deformation of the first electrical connector.

[0011] In one or more of the above optional embodiments, a portion of the first wiring harness is bent and arranged on a side of the elastic member facing away from the battery cell assembly, which helps to reduce pulling on the first wiring harness.

[0012] In one or more of the above optional embodiments, a first fixing member is further included to secure the first electrical connector to the bracket. When viewed along the third direction, a gap exists between the first electrical connector and the bracket of the first battery cell unit in the second direction, and the first, second, and third directions are perpendicular to each other. The first electrical connector is movable relative to the bracket via the first fixing member, thereby reducing pull on the first wiring harness and on the electrode terminals connected to the first electrical connector.

[0013] In one or more optional embodiments above, a second fixing member is further included, and part of the first wiring harness is fixed to the first side of the elastic member through the second fixing member. The first side is the side of the elastic member away from the battery cell assembly, which is conducive to fixing the position of the first wiring harness.

[0014] In one or more of the above optional embodiments, the housing includes a top wall and a bottom wall arranged opposite each other along a third direction, the bottom wall supporting the battery cell assembly, and the third direction is perpendicular to the first direction. Along the third direction, a portion of the first wiring harness is disposed on the elastic member to support the weight of the first wiring harness and reduce tension on the electrode terminals of the first battery cell.

[0015] In one or more of the above optional embodiments, the battery module includes a second wiring harness, the battery cell unit includes a second battery cell unit, and along the first direction, the first battery cell unit and the second battery cell unit are respectively located at the outermost sides of the battery cell assembly. The second wiring harness connects to the second battery cell unit, and the second wiring harness and the elastic member are separately arranged. When the battery cell unit expands or reduces its expansion, the second battery cell unit basically does not move, and the second wiring harness and the elastic member are separated, which helps to reduce pulling on the second wiring harness, reduce the risk of the second wiring harness being broken, and improve the safety of the battery module.

[0016] In one or more of the above optional embodiments, the second wire harness is fixed to at least one of the brackets.

[0017] In one or more optional embodiments above, the battery module includes a second electrical connector having a notch, the electrode terminal of the second battery cell unit passes through the notch and is connected to a side of the second electrical connector away from the second battery cell unit.

[0018] In one or more optional embodiments above, the battery module includes a third fixing member, which fixes the second electrical connector and the bracket. When viewed along the third direction, there is a gap between the second electrical connector and the bracket of the second battery cell unit in the second direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The second electrical connector moves relative to the bracket of the second battery cell unit through the third fixing member, which helps to reduce the pulling of the second wiring harness and the pulling of the electrode terminals connected to the second electrical connector.

[0019] In one or more of the above optional embodiments, the second wire harness is in a stretchable state, which helps to reduce pulling on the second wire harness and lower the risk of the second wire harness being broken.

[0020] In one or more of the above optional embodiments, the second wire harness has a curved structure, which is further conducive to reducing the pulling on the second wire harness and lowering the risk of the second wire harness being broken.

[0021] In one or more optional embodiments above, a sampling piece is further included. The sampling piece includes a sampling terminal and a sampling harness. The sampling harness is connected to the elastic piece. The sampling harness is in a stretchable state, which can reduce the pulling on the sampling piece.

[0022] In one or more of the above optional embodiments, the sampling harness is fixed to at least one of the brackets.

[0023] In one or more of the above optional embodiments, the elastic member includes a base, a buffer portion, and a connecting portion. The base portion is connected to the first battery cell unit and is configured to apply pressure to the battery cell assembly. The buffer portion is connected to the base portion and is configured to provide expansion space for the battery cell assembly. The connecting portion is connected to the housing, and a portion of the first wiring harness is fixed to a first side of the connecting portion, where the first side is the side of the connecting portion facing away from the battery cell assembly.

[0024] In one or more optional embodiments above, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are arranged along the third direction, the first connecting portion connects one side of the buffer portion, and the second connecting portion connects the other side of the buffer portion.

[0025] In one or more optional embodiments above, along the third direction, the first wire harness is fixed to the second connection portion, and the sampling wire harness is fixed to the first connection portion.

[0026] In one or more optional embodiments above, the housing includes a first side wall and a second side wall arranged along a second direction, the first direction being perpendicular to the second direction, and a first gap being formed between the second side wall and the base along the second direction, and the first wiring harness passes through the first gap.

[0027] In one or more of the above optional embodiments, a second gap is defined between the first side wall and the base, and the second wire harness passes through the second gap.

[0028] In one or more optional embodiments above, the battery module includes a first buffer member, which is arranged between the base and the first battery cell unit. The hardness of the first buffer member is less than that of the base, reducing damage to the first battery cell unit caused by the base.

[0029] In one or more optional embodiments above, the battery module includes a second buffer, which is arranged between the second battery cell unit and the rear wall. The hardness of the second buffer is less than that of the rear wall, reducing damage to the second battery cell unit caused by the rear wall.

[0030] In one or more of the above optional embodiments, the bottom wall is provided with two first limiting members, part of the battery cell assembly is provided between the two first limiting members, and the movement of the battery cell assembly is guided by the two first limiting members.

[0031] In one or more of the above optional embodiments, the top wall is provided with two second limiting members, and part of the battery cell assembly is provided between the two second limiting members, so that the movement of the battery cell assembly is further guided by the two second limiting members.

[0032] In one or more optional embodiments above, the stiffness of the elastic member is greater than the stiffness of the rear wall. When the battery cell expands, the elastic member deforms before the rear wall, and the elastic member provides expansion space for the battery cell assembly.

[0033] An embodiment of the present application provides a battery pack, comprising a top cover and the battery module of any one of the above embodiments, wherein the top cover is connected to a shell.

[0034] In one or more of the above optional embodiments, a circuit board is further included. The circuit board is arranged on the top cover, and the first wiring harness is connected to the circuit board.

[0035] An embodiment of the present application provides an electrical device, comprising the battery pack according to any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 shows a schematic structural diagram of a battery pack in some embodiments.

[0037] FIG2 shows an exploded schematic diagram of a battery pack in some embodiments.

[0038] FIG3 shows a schematic structural diagram of a battery module in some embodiments.

[0039] FIG4 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0040] FIG5 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0041] FIG6 shows a schematic structural diagram of a battery cell in some embodiments.

[0042] FIG. 7 shows an exploded schematic diagram of the battery cell in FIG. 4 .

[0043] FIG8 is a schematic structural diagram of a battery cell unit in some embodiments.

[0044] FIG9 is a schematic structural diagram of a battery cell unit from another perspective in some embodiments.

[0045] FIG10 shows a schematic structural diagram of a battery cell unit from another perspective in some embodiments.

[0046] FIG11 is a schematic diagram showing a partial structure of a battery cell unit in some embodiments.

[0047] FIG12 is a schematic diagram showing a partial structure of a battery cell unit in some embodiments.

[0048] FIG13 shows a schematic structural diagram of a battery cell unit from another perspective in some embodiments.

[0049] FIG14 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0050] FIG. 15 shows a simplified schematic diagram of the first section deployed in some embodiments.

[0051] FIG. 16 shows a schematic structural diagram of a first electrical connector in some embodiments.

[0052] FIG17 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0053] FIG. 18 shows a schematic structural diagram of a second electrical connector in some embodiments.

[0054] FIG19 is a schematic diagram showing a partial structure of a battery pack in some embodiments.

[0055] FIG20 is a schematic diagram showing a partial structure of a battery module in some embodiments.

[0056] FIG. 21 is a schematic structural diagram of an elastic member in some embodiments.

[0057] FIG22 is a schematic structural diagram of an elastic member from another perspective in some embodiments.

[0058] FIG. 23 shows a schematic structural diagram of yet another elastic member in some embodiments.

[0059] FIG24 shows a schematic structural diagram of a battery cell assembly, a first electrical connector, and a second electrical connector in some embodiments.

[0060] FIG. 25 shows an enlarged schematic diagram of point A in FIG. 24 .

[0061] FIG. 26 shows an enlarged schematic diagram of point B in FIG. 24 .

[0062] FIG27 shows a schematic structural diagram of electrical equipment in some embodiments.

[0063] Description of the main component symbols: Battery module 100 Shell 10 First side wall 11 First fixing portion 111 Second side wall 12 Second fixing portion 121 Bottom wall 13 Third fixing portion 131 First limiting member 13a Top wall 14 Fourth fixing portion 141 Second limiting member 14a Rear wall 15 Battery cell assembly 20 Gaps 210, 220 Battery cell unit 20a First battery cell unit 201 First hole 2011 Second battery cell unit 202 Battery cell 21 Battery cell shell 21a Main body 211 First wall 211c Second wall 211d First shell 2111 First recess 2111a Second shell 2112 Second recess 2112a First extended edge 2113 Second extended edge 2114 Sealing portion212 First sealing portion 212a First sealing connection portion 2121 First bending portion 2122 Second sealing portion 212b Electrode assembly 21b Electrode terminal 21c Bracket 22 First bracket 22a Second bracket 22b First portion 221 First side portion 222 First side extension 224 Second portion 226 Protrusion 227 First notch 228 Elastic member 30 First gap 301 Second gap 302 Base 31 Buffer portion 32 First buffer portion 321 First bending section 321a Second bending section 321b Second buffer portion 322 Third bending section 322a Fourth bending section 322b Connecting portion 33 First connecting portion 331 Second connecting portion 332 First wiring harness 40 First section 41First connection point 401 Second connection point 402 Second wiring harness 50 First electrical connector 60 First section 61 First inclined portion 61a Second hole 611 Second section 62 Second inclined portion 62a Third hole 621 Third section 63 Second electrical connector 70 Notch 71 Sampling member 90 Sampling terminal 91 Sampling wiring harness 92 First fixing member 101 Second fixing member 102 First connection end 103 Second connection end 104 Third fixing member 105 Fourth fixing member 106 First insulating sheet 110 First buffer member 120 Second buffer member 130 Battery pack 200 Front cover 16 Space 161 Circuit board 80 Electrical device 300 First directionX Second direction Y Third direction Z

[0064] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0066] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element. When an element is considered to be "disposed" or "provided on" another element, it may be directly disposed on the other element or there may be a centrally disposed element.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0068] It should be understood that, considering the factors of actual processing tolerance, the term "perpendicular" in the technical solution of this application is used to describe the ideal state between two components. In the actual production or use state, there may be a state that is approximately perpendicular between the two components. For example, in combination with the numerical description, perpendicularity can refer to the angle between two straight lines being between 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, the components can be considered as "straight lines" or "planes" if the overall extension direction is a straight line or a plane.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0070] The terms "left", "right", "top", "bottom", "front", "back" and similar expressions used herein are for illustrative purposes only and are not intended to limit the present application.

[0071] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the number of the components is two or more.

[0072] In the first direction X, it includes the first direction X and the direction opposite to the first direction X, in the second direction Y, it includes the second direction Y and the direction opposite to the second direction Y, and in the third direction Z, it includes the third direction Z and the direction opposite to the third direction Z.

[0073] For the convenience of description, some electrode terminals are not shown in a bent state in the drawings.

[0074] An embodiment of the present application provides a battery module, comprising a shell, a battery cell assembly, an elastic member and a first wiring harness. The battery cell assembly comprises a plurality of battery cell units, and the battery cell units comprise a first battery cell unit. The elastic member and the battery cell assembly are arranged along a first direction. The first battery cell unit is closer to the elastic member than the other battery cell units. The first wiring harness connects the first battery cell unit to form a first connection point. The first wiring harness is fixed to the elastic member to form a second connection point. The first wiring harness comprises a first section located between the first connection point and the second connection point, and the first section is in a stretchable state. When the battery cell unit expands or reduces in expansion, the first wiring harness is in a stretchable state and moves with the elastic member, thereby reducing the pulling on the first wiring harness, reducing the risk of the first wiring harness being broken, and improving the safety of the battery module.

[0075] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0076] Referring to FIG. 1 to FIG. 3 , an embodiment of the present application provides a battery module 100 , including a housing 10 and a cell assembly 20 . The cell assembly 20 is disposed in the housing 10 .

[0077] In some embodiments, the battery module 100 includes an elastic member 30 . The elastic member 30 is disposed in the housing 10 . The elastic member 30 and the battery cell assembly 20 are arranged along a first direction X.

[0078] In some embodiments, the elastic member 30 is configured to apply pressure to the battery cell assembly 20 and provide expansion space for the battery cell assembly 20 .

[0079] In some embodiments, the housing 10 includes a first side wall 11 and a second side wall 12 , which are arranged along a second direction Y. The battery cell assembly 20 is located between the first side wall 11 and the second side wall 12 along the second direction Y. The first direction X is perpendicular to the second direction Y.

[0080] In some embodiments, the housing 10 includes a bottom wall 13 and a top wall 14. The top wall 14 and the bottom wall 13 are arranged along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The bottom wall 13 connects the first side wall 11 and the second side wall 12, and the top wall 14 connects the first side wall 11 and the second side wall 12. Along the third direction Z, the battery cell assembly 20 is located between the bottom wall 13 and the top wall 14.

[0081] In some embodiments, the bottom wall 13 supports the battery cell assembly 20 .

[0082] In some embodiments, the housing 10 includes a rear wall 15 that connects the first side wall 11, the second side wall 12, the bottom wall 13, and the top wall 14. The elastic member 30, the battery cell assembly 20, and the rear wall 15 are arranged along a first direction X. Along the first direction X, the battery cell assembly 20 is disposed between the elastic member 30 and the rear wall 15.

[0083] Referring to FIG. 6 to FIG. 14 , in some embodiments, the battery cell assembly 20 includes a plurality of battery cell units 20 a , and the plurality of battery cell units 20 a are stacked along a first direction X.

[0084] In some embodiments, the battery cell unit 20 a includes a first battery cell unit 201 . The first battery cell unit 201 is closer to the elastic member 30 than other battery cell units 20 a .

[0085] In some embodiments, the battery cell unit 20a includes a second battery cell unit 202 . Along the first direction X, the first battery cell unit 201 and the second battery cell unit 202 are respectively located at the outermost sides of the battery cell assembly 20 . The first battery cell unit 201 is connected to the elastic member 30 , and the second battery cell unit 202 is connected to the rear wall 15 .

[0086] In some embodiments, the battery cell unit 20a includes a battery cell 21, the battery cell 21 includes a battery cell shell 21a, an electrode assembly 21b and an electrode terminal 21c, the battery cell shell 21a includes a main body 211, the electrode assembly 21b is located in the main body 211, and the electrode terminal 21c is connected to the electrode assembly 21b and extends out of the battery cell shell 21a.

[0087] In some embodiments, the battery cell unit 20 a is connected to the bottom wall 13 , and the battery cell unit 20 a is configured such that when the battery cell 21 expands, the battery cell unit 20 a moves relative to the bottom wall 13 in a direction opposite to the first direction X.

[0088] In some embodiments, the battery cell unit 20 a is connected to the bottom wall 13 , and the battery cell unit 20 a is configured to move relative to the bottom wall 13 along the first direction X when the expansion of the battery cell 21 decreases.

[0089] In some embodiments, the battery module 100 includes a first insulating sheet 110 . The first insulating sheet 110 is disposed between the bottom wall 13 and the battery cell assembly 20 to strengthen the insulation between the battery cell assembly 20 and the bottom wall 13 .

[0090] In some embodiments, the battery cell assembly 20 is connected to the first insulating sheet 110 , and the battery cell unit 20 a is configured such that, when the battery cell 21 expands, the battery cell unit 20 a moves on the first insulating sheet 110 in a direction opposite to the first direction X. For example, the battery cell assembly 20 is in contact with the first insulating sheet 110 .

[0091] In some embodiments, the battery cell assembly 20 is connected to the first insulating sheet 110 , and the battery cell unit 20 a is configured such that, when the battery cell 21 expands less, the battery cell unit 20 a moves on the first insulating sheet 110 along the first direction X. For example, the battery cell assembly 20 is in contact with the first insulating sheet 110 .

[0092] In some embodiments, the friction coefficient between the battery cell unit 20 a and the first insulating sheet 110 is smaller than the friction coefficient between the battery cell unit 20 a and the bottom wall 13 , which facilitates the movement of the battery cell unit 20 a .

[0093] In some embodiments, the cell casing 21 a includes a sealing portion 212 , the sealing portion 212 is connected to the main body 211 , and the electrode terminal 21 c extends from the sealing portion 212 out of the cell casing 21 a .

[0094] In some embodiments, the main body 211 includes a first shell 2111 and a second shell 2112. The first shell 2111 is provided with a first recess 2111a, and the second shell 2112 is provided with a second recess 2112a. The first shell 2111 is connected to the second shell 2112 to form a storage space. The electrode assembly 21b is partially provided in the first recess 2111a, and partially provided in the second recess 2112a. The circumference of the first shell 2111 extends outward to form a first extended edge 2113, and the circumference of the second shell 2112 extends outward to form a second extended edge 2114. After the first shell 2111 is connected to the second shell 2112, the first extended edge 2113 and the second extended edge 2114 overlap and are sealed together to form a sealing portion 212.

[0095] In some embodiments, the sealing portion 212 includes a first sealing portion 212 a , and the electrode terminal 21 c extends from the first sealing portion 212 a out of the cell housing 21 a .

[0096] In some embodiments, the sealing portion 212 includes a second sealing portion 212 b connected to the first sealing portion 212 a .

[0097] In some embodiments, the first extended edge 2113 and the second extended edge 2114 overlap and are sealed to form two first sealing portions 212a and two second sealing portions 212b. The two first sealing portions 212a are arranged along the second direction Y, and the two second sealing portions 212b are arranged along the third direction Z. One first sealing portion 212a connects the two second sealing portions 212b, and the other first sealing portion 212a connects the two second sealing portions 212b.

[0098] In some embodiments, the battery cell 21 includes two electrode terminals 21c, wherein one electrode terminal 21c extends from one of the two first sealing portions 212a out of the battery cell housing 21a, and the other electrode terminal 21c extends from the other of the two first sealing portions 212a out of the battery cell housing 21a.

[0099] In some embodiments, two electrode terminals 21 c extend out of the cell casing 21 a from the same first sealing portion 212 a .

[0100] In some embodiments, adjacent main body portions 211 are in contact and connected, which facilitates pressurization of the main body portions 211 .

[0101] In some embodiments, adjacent battery cell casings 21 a exert pressure on each other, so that the multiple battery cell units 20 a are in a pressurized state, which is beneficial to improving the service life of the battery cell units 20 a.

[0102] In some embodiments, the first sealing portion 212a includes a first sealing connection portion 2121 and two first bent portions 2122. The first sealing connection portion 2121 connects the two first bent portions 2122. The two first bent portions 2122 are arranged opposite each other along the third direction Z. The electrode terminal 21c extends from the first sealing connection portion 2121 out of the battery cell housing 21a.

[0103] In some embodiments, the cell housing 21 a includes an aluminum-plastic film.

[0104] In some embodiments, the battery cell 21 includes but is not limited to a soft-pack battery cell, a square battery cell, and a round battery cell.

[0105] In some embodiments, each battery cell unit 20 a further includes a bracket 22 , and the bracket 22 is connected to the battery cell 21 .

[0106] In some embodiments, the bracket 22 is configured so that when the battery cell 21 expands, the bracket 22 moves relative to the housing 10 in a direction opposite to the first direction X.

[0107] In some embodiments, the bracket 22 is configured to move relative to the housing 10 along the first direction X when the expansion of the battery cell 21 decreases.

[0108] In some embodiments, the bracket 22 is connected to the bottom wall 13 , and the bracket 22 is configured to move relative to the bottom wall 13 in a direction opposite to the first direction X when the battery cell 21 expands.

[0109] In some embodiments, the bracket 22 is connected to the bottom wall 13 , and the bracket 22 is configured to move relative to the bottom wall 13 along the first direction X when the expansion of the battery cell 21 decreases.

[0110] In some embodiments, the bracket 22 contacts and connects to the first insulating sheet 110 , and the bracket 22 is configured to move on the first insulating sheet 110 in a direction opposite to the first direction X when the battery cell 21 expands.

[0111] In some embodiments, the bracket 22 contacts and connects to the first insulating sheet 110 , and the bracket 22 is configured to move on the first insulating sheet 110 along the first direction X when the expansion of the battery cell 21 decreases.

[0112] In some embodiments, the bracket 22 is integrally formed with the battery cell 21, which can enhance the connection strength between the bracket 22 and the battery cell 21. Integral formation refers to direct fixation of the bracket 22 and the battery cell 21. Integral formation methods include, but are not limited to, potting and injection molding.

[0113] In some embodiments, after the insulating material is placed around the battery cell 21 through a pouring process, the insulating material is solidified to form a bracket 22, and the bracket 22 and the battery cell 21 are bonded and fixed. For example, the battery cell 21 is placed in a mold, and the insulating material is poured into the mold. After the insulating material is solidified to form the bracket 22 and is bonded and fixed to the battery cell 21, the bracket 22 and the battery cell 21 are taken out of the mold.

[0114] In some embodiments, the insulating material includes but is not limited to potting compound and foaming compound.

[0115] In some embodiments, the injection molding process includes placing the battery cell 21 into a mold, heating and melting the insulating material with an injection molding machine, allowing the melted insulating material to flow into the mold, and solidifying the insulating material to form the bracket 22, which is bonded and fixed to the battery cell 21. The bracket 22 and battery cell 21 are then removed from the mold. Optionally, the insulating material includes polyamide.

[0116] In some embodiments, the bracket 22 is mounted on the battery cell 21. For example, the bracket 22 is manufactured first, and then the bracket 22 is mounted on the battery cell 21.

[0117] In some embodiments, the bracket 22 is an insulating bracket, which can reduce the risk of short circuit between the bracket 22 and the battery cell 21 .

[0118] In some embodiments, the bracket 22 includes a first bracket 22 a that covers at least a portion of the sealing portion 212 .

[0119] In some embodiments, the first bracket 22a includes at least one first side portion 222, and each first side portion 222 covers a first bending portion 2122. By the first bracket 22a covering a portion of the first sealing portion 212a, protection of the first sealing portion 212a is increased.

[0120] In some embodiments, the first side portion 222 is connected to the bottom wall 13 . The first side portion 222 is configured such that when the battery cell 21 expands, the first side portion 222 moves relative to the bottom wall 13 in a direction opposite to the first direction X.

[0121] In some embodiments, the first side portion 222 is connected to the bottom wall 13 . The first side portion 222 is configured to move relative to the bottom wall 13 along the first direction X when the expansion of the battery cell 21 decreases.

[0122] In some embodiments, the first side portion 222 is connected to the first insulating sheet 110 . The first side portion 222 is configured such that, when the battery cell 21 expands, the first side portion 222 moves on the first insulating sheet 110 in a direction opposite to the first direction X. For example, the first side portion 222 contacts and connects to the first insulating sheet 110 .

[0123] In some embodiments, the first side portion 222 is connected to the first insulating sheet 110 and is configured such that, when the battery cell 21 expands less, the first side portion 222 moves on the first insulating sheet 110 along the first direction X. For example, the first side portion 222 contacts and connects to the first insulating sheet 110 .

[0124] In some embodiments, the first bracket 22 a includes two first side portions 222 , and the first side portions 222 are arranged along the third direction Z. One of the first side portions 222 is connected to the first insulating sheet 110 .

[0125] When the battery cell 21 expands, the first sealing portion 212a can move on the first insulating sheet 110 through the first side portion 222, and the first side portion 222 can reduce the friction between the first sealing portion 212a and the first insulating sheet 110 during movement, thereby facilitating movement and protecting the first sealing portion 212a, and reducing the risk of damage to the first sealing portion 212a and affecting the use of the battery module 100.

[0126] In some embodiments, the first bracket 22a includes a first portion 221 , and the first portion 221 covers at least a portion of the first sealing connection portion 2121 to increase protection for the first sealing portion 212a.

[0127] In some embodiments, along the third direction Z, one end of the first portion 221 is connected to the first side portion 222 , and the other end is connected to another first side portion 222 , which can increase the structural strength of the first bracket 22a and facilitate protection of the first sealing portion 212a .

[0128] In some embodiments, the first bracket 22a includes at least one first side extension 224, which covers a portion of the main body 211. The first side extension 224 can protect the main body 211 and increase the connection strength between the first bracket 22a and the battery cell 21.

[0129] In some embodiments, the first bracket 22a includes at least one first side extension 224. The first side extension 224 covers a portion of the main body 211 and one of the second sealing portions 212b. The first side extension 224 and the second sealing portion 212b are located on the same side of the main body 211. The first side extension 224 protects the main body 211 and the second sealing portion 212b and increases the connection strength between the first bracket 22a and the battery cell 21.

[0130] In some embodiments, the first bracket 22a includes two first side extensions 224, which are arranged along the third direction Z. One of the first side extensions 224 covers a portion of the main body 211 and one of the second sealing portions 212b, and the first side extension 224 and the second sealing portion 212b are located on the same side of the main body 211. The other first side extension 224 covers a portion of the main body 211 and the other second sealing portion 212b, and the first side extension 224 and the second sealing portion 212b are located on the same side of the main body 211. The first side extensions 224 protect the main body 211 and the second sealing portion 212b and increase the connection strength between the first bracket 22a and the battery cell 21.

[0131] In some embodiments, the first side extension 224 is connected to the bottom wall 13 . The first side extension 224 is configured to move relative to the bottom wall 13 in a direction opposite to the first direction X when the battery cell 21 expands.

[0132] In some embodiments, the first side extension 224 is connected to the bottom wall 13 . The first side extension 224 is configured to move relative to the bottom wall 13 along the first direction X when the expansion of the battery cell 21 decreases.

[0133] In some embodiments, the first side extension 224 is connected to the first insulating sheet 110 . The first side extension 224 is configured such that, when the battery cell 21 expands, the first side extension 224 moves on the first insulating sheet 110 in a direction opposite to the first direction X. For example, the first side extension 224 contacts and connects to the first insulating sheet 110 .

[0134] In some embodiments, the first side extension 224 is connected to the first insulating sheet 110 . The first side extension 224 is configured such that, when the battery cell 21 expands less, the first side extension 224 moves on the first insulating sheet 110 along the first direction X. For example, the first side extension 224 contacts and connects to the first insulating sheet 110 .

[0135] When the battery cell 21 expands, the main body 211 can move on the first insulating sheet 110 through the first side extension portion 224, and the first side extension portion 224 can reduce the friction between the main body 211 and the first insulating sheet 110 during movement, thereby facilitating movement and protecting the main body 211, and reducing the risk of damage to the main body 211 and affecting the use of the battery module 100.

[0136] In some embodiments, the first side extension portion 224 extends from the first side portion 222 , which helps to strengthen the connection strength between the first side extension portion 224 and the first side portion 222 .

[0137] In some embodiments, the main body 211 includes a first wall 211 c , and the first sealing portion 212 a is connected to the first wall 211 c .

[0138] In some embodiments, the first bracket 22a includes a second portion 226 that covers a portion of the first wall 211c to protect the main body 211. One end of the first portion 221 is connected to one of the first side portions 222, and the other end is connected to the other first side portion 222. One end of the second portion 226 is connected to one of the first side portions 222, and the other end is connected to the other first side portion 222. This further increases the structural strength of the first bracket 22a and further facilitates protection of the first sealing portion 212a.

[0139] In some embodiments, the first bracket 22a includes two second portions 226 and two first walls 211c.

[0140] In some embodiments, the first bracket 22 a includes a protrusion 227 , and the protrusion 227 protrudes from the first portion 221 along a direction opposite to the second direction Y.

[0141] In some embodiments, the battery module 100 includes a detection member (not shown). A receiving groove 227a is provided on the side of the protrusion 227 facing away from the electrode terminal 21c. The detection member is received within the receiving groove 227a. The detection member is configured to detect the temperature of the battery cell 21. Optionally, the detection member is configured to detect the temperature of the electrode terminal 21c, which helps improve the accuracy of detecting the temperature of the battery cell 21.

[0142] 13 , when viewed from a direction opposite to the first direction X, the electrode terminal 21 c is not blocked by the protrusion 227. In some embodiments, the main body 211 includes two second walls 211 d, and the first wall 211 c connects the two second walls 211 d.

[0143] In some embodiments, referring to FIG. 13 , as viewed along the second direction Y, in the first direction X, the second portion 226 does not extend beyond the second wall 211 d , and the main bodies 211 of adjacent battery cells 21 can be in contact and connected, and the adjacent battery cells 21 apply pressure to each other through the main bodies 211 .

[0144] In some embodiments, referring to FIG. 13 , when viewed along the second direction Y, in the first direction X, the second portion 226 is located between the two second walls 211 d. When the main bodies 211 of adjacent battery cells 21 apply pressure to each other, the force on the first sealing portion 212 a can be reduced, thereby improving protection of the first sealing portion 212 a.

[0145] In some embodiments, referring to FIG. 13 , when viewed along the second direction Y, in the first direction X, the first side portion 222 is located between the two second walls 211 d. When the main bodies 211 of adjacent battery cells 21 apply pressure to each other, the force on the first sealing portion 212 a can be reduced, thereby improving protection of the first sealing portion 212 a.

[0146] In some embodiments, when viewed along the second direction Y, in the first direction X, the first side extension portion 224 is located between the two second walls 211d. When the main bodies 211 of adjacent battery cells 21 apply pressure to each other, the force on the first sealing portion 212a can be reduced, thereby improving the protection of the first sealing portion 212a.

[0147] In some embodiments, the bracket 22 includes a second bracket 22 b connected to another first sealing portion 212 a .

[0148] In some embodiments, the first bracket 22a and the second bracket 22b have the same structure.

[0149] In some embodiments, the first bracket 22a and the second bracket 22b are similar, so repeated description of the same or similar configurations as the first bracket of the previous embodiment will be omitted, and hereinafter, focus will be placed on structures different from the previous embodiment.

[0150] Please refer to Figures 10 and 11. In some embodiments, the second bracket 22b is provided with a first notch 228. Part of the first sealing connection portion 2121 of another first sealing portion 212a is located in the first notch 228. When the battery cell 21 expands, the pressure inside the battery cell 21 can be discharged through the first sealing connection portion 2121 in the first notch 228, which is conducive to pressure relief and improves the safety of the battery cell unit 20a.

[0151] In some embodiments, the first notch 228 and the detection member are provided on different brackets to reduce the risk of damaging the detection member during pressure relief.

[0152] In some embodiments, the first bracket 22a may be provided with a first notch 228 as shown in the second bracket 22b.

[0153] Referring to FIG. 11 , in some embodiments, the second bracket 22 b is not provided with the protrusion 227 shown in FIG. 9 .

[0154] In some embodiments, the bottom wall 13 is provided with two first stoppers 13a, which are spaced apart along the second direction Y and each extend along the first direction X. A portion of the battery cell assembly 20 is positioned between the two first stoppers 13a, and the two first stoppers 13a guide the movement of the battery cell assembly 20. Alternatively, the two first stoppers 13a guide the movement of the battery cell assembly 20 in a direction opposite to the first direction X. Alternatively, the first stoppers 13a are formed by protruding from the bottom wall 13 toward the top wall 14.

[0155] In some embodiments, the main body 211 of each battery cell unit 20 a is disposed between two first limiting members 13 a .

[0156] In some embodiments, the top wall 14 is provided with two second stoppers 14a, which are spaced apart along the second direction Y and each extend along the first direction X. A portion of the battery cell assembly 20 is disposed between the two second stoppers 14a, and the two second stoppers 14a further guide the movement of the battery cell assembly 20. Alternatively, the two second stoppers 14a guide the movement of the battery cell assembly 20 in a direction opposite to the first direction X. Alternatively, the second stoppers 14a are formed by protruding from the top wall 14 toward the bottom wall 13.

[0157] In some embodiments, the main body 211 of each battery cell unit 20 a is disposed between two second limiting members 14 a .

[0158] In some embodiments, the bottom wall 13 is provided with two first limiting members 13 a, and the top wall 14 is provided with two second limiting members 14 a.

[0159] In some embodiments, the elastic member 30 has a stiffness greater than that of the rear wall 15 . When the battery cell 21 expands, the elastic member 30 deforms before the rear wall 15 . The elastic member 30 provides expansion space for the battery cell assembly 20 .

[0160] In some embodiments, the base 31 is connected to the first battery cell unit 201. Alternatively, the base 31 is in contact with and connected to the first battery cell unit 201. Alternatively, the base 31 and the first battery cell unit 201 may provide other component connections.

[0161] In some embodiments, the battery module 100 includes a first buffer member 120, which is disposed between the base 31 and the first battery cell unit 201. Optionally, the first buffer member 120 includes foam.

[0162] In some embodiments, the hardness of the first buffer 120 is less than that of the base 31 , thereby reducing damage to the first battery cell 201 caused by the base 31 .

[0163] In some embodiments, the rear wall 15 is connected to the second battery cell unit 202 .

[0164] In some embodiments, the battery module 100 includes a second buffer 130, which is disposed between the second battery cell unit 202 and the rear wall 15. Optionally, the first buffer includes foam.

[0165] In some embodiments, the hardness of the second buffer 130 is less than that of the rear wall 15 , thereby reducing damage to the second battery cell unit 202 caused by the rear wall 15 .

[0166] In some embodiments, the foam material includes ethylene vinyl acetate copolymer (EVA)

[0167] Referring to Figures 2 to 5 and Figures 14 to 20, in some embodiments, the battery module 100 includes a first wiring harness 40, which connects the first battery cell unit 201 and forms a first connection point 401. The first wiring harness 40 is fixed to the elastic member 30 and forms a second connection point 402. The first wiring harness 40 includes a first section 41 located between the first connection point 401 and the second connection point 402, and the first section 41 is in a stretchable state.

[0168] The first wiring harness 40 is flexible. When the battery cell unit 20a expands or reduces its expansion, the first wiring harness 40 is in a stretchable state and moves with the elastic member 30, which can reduce the pulling on the first wiring harness 40, reduce the risk of the first wiring harness 40 being broken, and improve the safety of the battery module 100.

[0169] In some embodiments, the first wiring harness 40 may transmit power and / or electrical signals of the battery module 100 .

[0170] In some embodiments, the first wiring harness 40 can transmit power to the battery module 100. When the battery module 100 is discharging, the power of the battery module 100 can be transmitted to the load of the electrical device through the first wiring harness 40 to power the load of the electrical device. When the battery module 100 is charging, external power can be transmitted to the battery module 100 through the first wiring harness 40 to charge the battery module 100.

[0171] In some embodiments, the first wiring harness 40 can transmit electrical signals from the battery module 100, such as voltage signals, current signals, and temperature signals. The electrical signals from the battery module 100 can be transmitted to the circuit board via the first wiring harness 40. A control unit (e.g., a microcontroller) on the circuit board can control the charging and / or discharging of the battery module 100 based on the electrical signals from the battery module 100.

[0172] In some embodiments, at least a portion of the first section 41 is in a bent state, which helps to reduce pulling on the first wire harness 40 and lower the risk of the first wire harness 40 being broken.

[0173] In some embodiments, the distance between the first connection point 401 and the second connection point 402 is D1 mm. Along the first direction X, the natural length of the first segment 41 is L1 mm. L1 is greater than D1, further facilitating reduced pulling on the first wire harness 40 and lowering the risk of the first wire harness 40 being broken. Optionally, L1-D1 ≥ 5 mm.

[0174] In some embodiments, along the third direction Z, part of the first wire harness 40 is disposed on the elastic member 30 . The elastic member 30 can bear the weight of the first wire harness 40 and reduce the pulling on the electrode terminal 21 c of the first battery cell unit 201 .

[0175] In some embodiments, the battery module 100 includes a second wiring harness 50. The second battery cell 202 is located closer to the right wall 15 than the other battery cells. The second wiring harness 50 connects to the second battery cell 202, and the second wiring harness 50 and the elastic member 30 are separately arranged. The second battery cell 202 is located near the right wall 15. When the battery cell 202 expands or decreases in expansion, the second battery cell 202 remains substantially stationary. The second wiring harness 50 and the elastic member 30 are separately arranged, which helps reduce pulling on the second wiring harness 50, lowering the risk of the second wiring harness 50 being broken, and improving the safety of the battery module 100. Separate arrangement means that the second wiring harness 50 and the elastic member 30 are not in contact and connected, and are not secured by other components.

[0176] In some embodiments, the second wire harness 50 is configured to transmit power of the battery cell assembly 20 . In other embodiments, the second wire harness 50 can be used to collect electrical signals of the battery cell 21 .

[0177] In some embodiments, the second wiring harness 50 may transmit power and / or electrical signals of the battery module 100 .

[0178] In some embodiments, the second wiring harness 50 can transmit power to the battery module 100. When the battery module 100 is discharging, the power of the battery module 100 can be transmitted to the load of the electrical device through the second wiring harness 50 to power the load of the electrical device. When the battery module 100 is charging, external power can be transmitted to the battery module 100 through the second wiring harness 50 to charge the battery module 100.

[0179] In some embodiments, the second wiring harness 50 can transmit electrical signals from the battery module 100, such as voltage signals, current signals, and temperature signals. The electrical signals from the battery module 100 can be transmitted to the circuit board via the second wiring harness 50, and a control unit (e.g., a microcontroller) on the circuit board can control the charging and / or discharging of the battery module 100 based on the electrical signals from the battery module 100.

[0180] In some embodiments, the first wiring harness 40 is connected to a common positive terminal of the battery module 100 , and the first wiring harness 40 is connected to a common negative terminal of the battery module 100 .

[0181] In some embodiments, the second wire harness 50 is in a stretched state, which helps to reduce pulling on the second wire harness 50 and lower the risk of the second wire harness 50 being broken.

[0182] In some embodiments, the second wire harness 50 has a curved structure, which further helps to reduce pulling on the second wire harness 50 and lower the risk of the second wire harness 50 being broken.

[0183] 14 , 15 , and 16 , in some embodiments, the battery module 100 further includes a first electrical connector 60 . The first electrical connector 60 is connected to at least one bracket 22 , is connected to the first battery cell unit 201 , and the first wiring harness 40 is connected to the first battery cell unit 201 via the first electrical connector 60 .

[0184] Optionally, the first electrical connector 60 is connected to the first bracket 22a. Optionally, the first electrical connector 60 is connected to the second bracket 22b.

[0185] In some embodiments, the first electrical connector 60 includes a first section 61 , and the first section 61 is connected to one side of the bracket 22 . Optionally, the first section 61 is connected to one side of the bracket 22 of the first battery cell unit 201 .

[0186] In some embodiments, the first electrical connector 60 includes a second section 62 , and the second section 62 is connected to the other side of the bracket 22 . Alternatively, the first section 61 is connected to the other side of the bracket 22 of the first battery cell unit 201 .

[0187] In some embodiments, the first wire harness 40 connects one of the first section 61 and the second section 62. Alternatively, the first wire harness 40 connects the first section 61 or the second section 62 by welding, and forms the first connection point 401.

[0188] In some embodiments, the first electrical connector 60 includes a third section 63 that connects the first section 61 and the second section 62 . The electrode terminal 21 c is connected to a side of the third section 63 that faces away from the bracket 22 .

[0189] In some embodiments, the first section 61 includes a first inclined portion 61 a . Along the first direction X, the third section 63 is closer to the elastic member 30 than the first inclined portion 61 a , which helps to reduce the pulling on the electrode terminal 21 c .

[0190] In some embodiments, the second section 62 includes a second inclined portion 62 a , and along the first direction X, the third section 63 is closer to the elastic member 30 than the second inclined portion 62 a , which helps to reduce the pulling on the electrode terminal 21 c .

[0191] In some embodiments, the third section 63 is separated from the bracket 22 of the first battery cell unit 201, and the third section 63 has no direct contact connection with the bracket 22 of the first battery cell unit 201. There is an air gap between the third section 63 and the bracket 22 of the first battery cell unit 201, which is conducive to the deformation of the first electrical connector 60.

[0192] In some embodiments, the first section 61 , the second section 62 and the third section 63 are integrally formed.

[0193] In some embodiments, the first electrical connector 60 comprises a copper busbar.

[0194] In some embodiments, the first electrical connector 60 is connected to the bracket 22 of the first battery cell unit 201 , and the first electrical connector 60 is connected to the battery cell 21 of the first battery cell unit 201 . The first wiring harness 40 is connected to the battery cell 21 of the first battery cell unit 201 through the first electrical connector 60 .

[0195] Please refer to Figures 11, 14 and 15. In some embodiments, the battery module 100 includes a first fixing member 101, which fixes the first electrical connector 60 and the bracket 22. The first electrical connector 60 is separated from the bracket 22 by the first fixing member 101. The first electrical connector 60 can move relative to the bracket 22 through the first fixing member 101, which is beneficial to reduce the pulling on the first wiring harness 40 and reducing the pulling on the electrode terminal 21c connected to the first electrical connector 60.

[0196] In some embodiments, along the third direction Z, the bracket 22 is provided with two first holes 2011, the first section 61 is provided with a second hole 611, and the second section 62 is provided with a third hole 621. A first fixing member 101 passes through the second hole 611 and is fixed to one of the first holes 2011. The other first fixing member 101 passes through the third hole 621 and is fixed to the other first hole 2011. A portion of the first fixing member 101 is positioned between the first electrical connector 60 and the bracket 22 to support the first electrical connector 60, thereby separating the first electrical connector 60 from the bracket 22 of the first battery cell unit 201. Optionally, the first fixing member 101 comprises a rolled strip.

[0197] In some embodiments, a portion of the first wire harness 40 is bent and disposed on a side of the elastic member 30 facing away from the battery cell assembly 20 , which helps to reduce pulling on the first wire harness 40 .

[0198] Please refer to Figure 20. In some embodiments, the battery module 100 also includes a second fixing member 102. A portion of the first wiring harness 40 is fixed to the first side of the elastic member 30 through the second fixing member 102, wherein the first side is the side of the elastic member 30 away from the battery cell assembly 20, which is conducive to fixing the position of the first wiring harness 40.

[0199] 24 and 25 , when viewed along the third direction Z, a gap 210 exists between the first electrical connector 60 and the bracket 22 of the first battery cell unit 201 in the second direction Y, which helps reduce the pulling of the electrode terminal 21 c. The gap 210 is an air gap.

[0200] Referring to FIG. 17 and FIG. 18 , in some embodiments, the battery module 100 further includes a second electrical connector 70 .

[0201] In some embodiments, the second electrical connector 70 has a notch 71 , and the electrode terminal 21 c of the second battery cell unit 202 passes through the notch 71 and connects to a side of the second electrical connector 70 facing away from the battery cell 21 of the second battery cell unit 202 .

[0202] In some embodiments, the second electrical connector 70 includes a copper busbar.

[0203] In some embodiments, the battery module 100 includes a third fixing member 105, which connects the second electrical connector 70 to the bracket 22 of the second battery cell unit 202. The second electrical connector 70 is separated from the bracket 22 of the second battery cell unit 202 by the third fixing member 105. The second electrical connector 70 moves relative to the bracket 22 of the second battery cell unit 202 via the third fixing member 105, which helps reduce pulling on the second wiring harness 50 and reducing pulling on the electrode terminal 21c connected to the second electrical connector 70. Optionally, the third fixing member 105 includes a rolled strip.

[0204] 24 and 26 , when viewed along the third direction Z, a gap 220 exists between the second electrical connector 70 and the bracket 22 of the second battery cell unit 202 in the second direction Y, which helps reduce the pulling of the electrode terminal 21 c. The gap 220 is an air gap.

[0205] In some embodiments, the third fixing member 105 is connected to the second electrical connector 70 and the bracket 22 of the second battery cell unit 202 in the same manner as the first fixing member 101 .

[0206] In some embodiments, the second wire harness 50 is bent and connected to other brackets 22 via a third fixing member 105 . Part of the second wire harness 50 is configured to move in the first direction X relative to the third fixing member 105 connected to other brackets 22 .

[0207] In some embodiments, the second electrical connector 70 is connected to the bracket 22 of the second battery cell unit 202, and the second electrical connector 70 is connected to the battery cell 21 of the second battery cell unit 202. The second wiring harness 50 is connected to the battery cell 21 of the second battery cell unit 202 through the second electrical connector 70. Optionally, the second wiring harness 50 is connected to the second electrical connector 70 by welding.

[0208] Referring to Figures 19 and 20 , in some embodiments, the battery module 100 includes a sampling component 90, which includes sampling terminals 91 and a sampling harness 92. The sampling terminals 91 are connected to each battery cell 21, and the sampling harness 92 is connected to the circuit board 80 to transmit the collected electrical signals from the battery cells 21 to the circuit board 80. Optionally, the electrode terminals 21c of adjacent battery cells 21 are stacked, and the sampling terminal 91 is connected to at least one of the stacked electrode terminals 21c. The electrical signals may include information such as current, voltage, resistance, and temperature.

[0209] In some embodiments, the sampling harness 92 is secured to at least one of the supports 22 .

[0210] In some embodiments, the sampling harness 92 is connected to the elastic member 30 , and the sampling harness 92 is in a stretchable state, which can reduce the pulling on the sampling member 90 .

[0211] In some embodiments, the battery module 100 includes a fourth fixing member 106, through which the sampling harness 92 is connected to at least one bracket 22. A portion of the fourth fixing member 106 is wound around the sampling harness 92, and a portion of the fourth fixing member 106 is fixed to the bracket 22. The sampling harness 92 can move relative to the fourth fixing member 106 along the first direction X, which helps reduce pulling on the sampling member 90. Optionally, the fourth fixing member 106 includes a rolled strip.

[0212] Referring to FIG. 20 to FIG. 23 , in some embodiments, the elastic member 30 includes a base 31 , the base 31 is connected to the battery cell 21 of the first battery cell unit 201 , and the base 31 is configured to apply pressure to the battery cell assembly 20 .

[0213] In some embodiments, a first gap 301 is defined between the second sidewall 12 and the base 31 , and the first wire harness 40 passes through the first gap 301 and is connected to the circuit board 80 .

[0214] In some embodiments, a second gap 302 is defined between the first sidewall 11 and the base 31 , and the second wire harness 50 passes through the second gap 302 .

[0215] In some embodiments, the elastic member 30 includes a buffer portion 32 connected to the base portion 31 , and the buffer portion 32 is configured to provide expansion space for the battery cell assembly 20 .

[0216] In some embodiments, the buffer portion 32 includes a first buffer portion 321 connected to one side of the base portion 31. The first buffer portion 321 can act on the battery cell assembly 20 through the base portion 31, and the first buffer portion 321 can provide expansion space for the battery cell assembly 20.

[0217] In some embodiments, the buffer portion 32 includes a second buffer portion 322 , and the first buffer portion 321 is disposed opposite the second buffer portion 322 along the third direction Z. The second buffer portion 322 is connected to the other side of the base portion 31 . The second buffer portion 322 can act on the battery cell assembly 20 through the base portion 31 , and the second buffer portion 322 is configured to provide expansion space for the battery cell assembly 20 .

[0218] In some embodiments, the elastic member 30 includes a connecting portion 33 connected to the housing 10 . A portion of the first wiring harness 40 is fixed to a first side of the connecting portion 33 , which is a side of the connecting portion 33 facing away from the battery cell assembly 20 .

[0219] In some embodiments, the housing 10 includes a first fixing portion 111 , which is disposed on at least one of the first side wall 11 , the second side wall 12 , the bottom wall 13 , and the top wall 14 .

[0220] In some embodiments, the first fixing portion 111 is provided on the first side wall 11, and the first fixing portion 111 is fixed to the first side wall 11. Optionally, the first fixing portion 111 and the first side wall 11 are integrally formed.

[0221] In some embodiments, the first fixing portion 111 is connected to the first side wall 11. Alternatively, the first fixing portion 111 is welded to the first side wall 11. Alternatively, the first fixing portion 111 is connected to the first side wall 11 by a fastener such as a screw.

[0222] In some embodiments, the housing 10 includes a second fixing portion 121 , which is disposed on at least one of the first side wall 11 , the second side wall 12 , the bottom wall 13 , and the top wall 14 .

[0223] In some embodiments, the second fixing portion 121 is provided on the second side wall 12, and the second fixing portion 121 is fixed to the second side wall 12. Optionally, the second fixing portion 121 and the second side wall 12 are integrally formed.

[0224] In some embodiments, the second fixing portion 121 is connected to the second side wall 12. Alternatively, the second fixing portion 121 is welded to the second side wall 12. Alternatively, the second fixing portion 121 is connected to the second side wall 12 by fasteners such as screws.

[0225] In some embodiments, the first fixing portion 111 is provided on the bottom wall 13, and the first fixing portion 111 is fixed to the bottom wall 13. Optionally, the first fixing portion 111 and the bottom wall 13 are integrally formed.

[0226] In some embodiments, the first fixing portion 111 is connected to the bottom wall 13. Alternatively, the first fixing portion 111 is welded to the bottom wall 13. Alternatively, the first fixing portion 111 is connected to the bottom wall 13 by fasteners such as screws.

[0227] In some embodiments, the second fixing portion 121 is provided on the top wall 14, and the second fixing portion 121 is fixed to the top wall 14. Optionally, the second fixing portion 121 and the top wall 14 are integrally formed.

[0228] In some embodiments, the second fixing portion 121 is connected to the top wall 14. Alternatively, the second fixing portion 121 is welded to the top wall 14. Alternatively, the second fixing portion 121 and the top wall 14 are connected using fasteners such as screws. In some embodiments, the connecting portion 33 includes a first connecting portion 331, which is connected to the side of the first buffer portion 321 facing away from the base 31.

[0229] In some embodiments, the connecting portion 33 includes a second connecting portion 332 , and the first connecting portion 331 and the second connecting portion 332 are disposed opposite to each other along the third direction Z. The second connecting portion 332 connects a side of the second buffer portion 322 facing away from the base 31 .

[0230] In some embodiments, the first connecting portion 331 connects the first fixing portion 111 and the second fixing portion 121 .

[0231] In some embodiments, the second connecting portion 332 connects the first fixing portion 111 and the second fixing portion 121 .

[0232] In some embodiments, the bottom wall 13 is provided with a third fixing portion 131 , and the elastic member 30 is connected to the third fixing portion 131 , which is conducive to fixing the elastic member 30 .

[0233] In some embodiments, the second connecting portion 332 connects the first fixing portion 111 , the second fixing portion 121 , and the third fixing portion 131 .

[0234] In some embodiments, the top wall 14 is provided with a fourth fixing portion 141, and the elastic member 30 is connected to the fourth fixing portion 141, so that the elastic member 30 is connected to the shell 10 on both sides along the second direction Y and on both sides along the third direction Z, which is conducive to uniform force and uniform deformation of the elastic member 30.

[0235] In some embodiments, the first connecting portion 331 connects the first fixing portion 111 , the second fixing portion 121 , and the fourth fixing portion 141 .

[0236] In some embodiments, the first wire harness 40 is connected to the second connection portion 332 .

[0237] In some embodiments, the first wire harness 40 is connected to the second connection portion 332 via the second fixing member 102 .

[0238] In some embodiments, the sampling harness 92 is connected to the first connection portion 331 .

[0239] In some embodiments, the sampling harness 92 is connected to the first connection portion 331 via the fourth fixing member 106 .

[0240] In some embodiments, the strength of the first side wall 11, the second side wall 12, the bottom wall 13 and the top wall 14 is greater than the strength of the elastic member, thereby reducing the risk of deformation of the first side wall 11, the second side wall 12, the bottom wall 13 and the top wall 14 due to the force applied to the buffer portion 32.

[0241] In some embodiments, the first buffer portion 321 includes a first bending section 321 a , and the first bending section 321 a is connected to the base portion 31 .

[0242] In some embodiments, the first buffer portion 321 includes a second bent section 321b, which connects the first bent section 321a and the first connecting portion 331. The first bent section 321a and the base portion 31 form a first angle A1, and the second bent section 321b and the first connecting portion 331 form a second angle B1, where A1 ≥ B1. This helps increase the first bent section 321a's ability to resist deformation and reduces the risk of deformation of the elastic member 30 in the first direction X.

[0243] In some embodiments, the first bending section 321 a and the second bending section 321 b form a third angle C1 , where C1 > A1 , which is beneficial for promoting uniform deformation of the first buffer portion 321 .

[0244] In some embodiments, C1 = 2B1 = 2A1, which is beneficial for further improving the uniform deformation of the first buffer portion 321 .

[0245] In some embodiments, the second buffer portion 322 includes a third bending section 322 a , and the third bending section 322 a is connected to the base portion 31 .

[0246] In some embodiments, the second buffer portion 322 includes a fourth bent section 322b, which connects the third bent section 322a and the second connecting portion 332. The third bent section 322a and the base portion 31 form a first angle A2, the fourth bent section 322b and the second connecting portion 332 form a second angle B2, and the third bent section 322a and the fourth bent section 322b form a third angle C2. A2 ≥ B2 effectively increases the third bent section 322a's ability to resist deformation and reduces the risk of deformation of the elastic member 30 in the first direction X.

[0247] In some embodiments, C2>A2, which is beneficial to improving the uniform deformation of the second buffer portion 322.

[0248] In some embodiments, C2=2B2=2A2, which is beneficial to further improve the uniform deformation of the second buffer portion 322.

[0249] In some embodiments, the second buffer portion 322 is set at the same angle as the first buffer portion 321. When the first and second buffer portions 321 and 322 are subjected to force, they can be evenly stressed and deformed, reducing the risk of uneven deformation causing the elastic member 30 to rotate. Optionally, A1 = A2, B1 = B2, and C1 = C2.

[0250] 1 and 2 , an embodiment of the present application provides a battery pack 200 , including a front cover 16 and a battery module 100 according to any of the above embodiments. The front cover 16 is connected to the housing 10 .

[0251] In some embodiments, the front cover 16 is detachably connected to the battery module 100 to facilitate maintenance of the battery pack 200 .

[0252] In some embodiments, the front cover 16 is detachably connected to the housing 10 .

[0253] Optionally, the front cover 16 connects the first side wall 11 , the second side wall 12 , the bottom wall 13 and the top wall 14 .

[0254] In some embodiments, the front cover 16 is detachably connected to the elastic member 30 .

[0255] In some embodiments, the front cover 16 defines a space 161, and the battery pack 200 includes a circuit board 80 disposed within the space 161. The circuit board 80 is connected to the battery cell assembly 20. Optionally, the first electrical connector 60 is connected to the circuit board 80. Optionally, the sampling harness 92 is connected to the circuit board 80.

[0256] Optionally, the circuit board 80 includes a BMS component (Battery Management System), which includes multiple electronic components. The multiple electronic components can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0257] Optionally, the circuit board 80 includes a flexible printed circuit (FPC). Optionally, the circuit board 80 includes a printed circuit board (PCB).

[0258] In some embodiments, the battery pack 200 includes a first connection terminal 103 and a second connection terminal 104, which are connected to the front cover 16. One of the first connection terminal 103 and the second connection terminal 104 is connected to the circuit board 80, and the other is connected to the first electrical connector 60. The first connection terminal 103 and the second connection terminal 104 protrude from the side of the front cover 16 facing away from the battery cell assembly 20 for connection to external devices.

[0259] 27 , the present application also provides an electrical device 300 using the battery pack 200. In one embodiment, the electrical device 300 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, power tools, large household battery modules, and the like.

[0260] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery module, characterized in that, it includes: a housing, a battery cell assembly including a plurality of battery cell units, and the battery cell units include a first battery cell unit; an elastic member, the elastic member and the battery cell assembly are arranged in a first direction, and the first battery cell unit is closer to the elastic member than other battery cell units; a first wire harness, the first wire harness is connected to the first battery cell unit to form a first connection point, the first wire harness is fixed to the elastic member to form a second connection point, the first wire harness includes a first section between the first connection point and the second connection point, and the first section is in a stretchable state.

2. The battery module according to claim 1, characterized in that, at least part of the first section is in a bent state.

3. The battery module according to claim 1, characterized in that, the straight-line distance between the first connection point and the second connection point is D1 mm, along the first direction, the natural length of the first section is L1 mm, and L1 is greater than D1.

4. The battery module according to any one of claims 1-3, characterized in that, each battery cell unit includes a battery cell and a bracket, the battery cell includes electrode terminals, and the bracket is connected to the battery cell; the battery module further includes a first electrical connector; the first electrical connector is connected to the bracket of the first battery cell unit, the first electrical connector is connected to the battery cell, and the first wire harness is connected to the battery cell of the first battery cell unit through the first electrical connector.

5. The battery module according to claim 4, characterized in that, the first electrical connector includes a first section, a second section and a third section; the first section is connected to the bracket, the second section is connected to the bracket, the third section is connected to the first section and the second section, and the electrode terminal is connected to a side of the third section away from the bracket; the first section includes a first inclined portion, and along the first direction, the third section is closer to the elastic member than the first inclined portion; and / or, the second section includes a second inclined portion, and along the first direction, the third section is closer to the elastic member than the second inclined portion.

6. The battery module according to claim 5, characterized in that, the third section is separated from the bracket of the first battery cell unit.

7. The battery module according to any one of claims 1 to 6, characterized in that, a part of the first wire harness is bent and arranged on a side of the elastic member away from the battery cell assembly.

8. The battery module according to any one of claims 4 to 6, characterized in that, it further includes a first fixing member for fixing the first electrical connector and the bracket; when observed in a third direction, in a second direction, there is a gap between the first electrical connector and the bracket of the first battery cell unit, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

9. The battery module according to any one of claims 1 to 8, characterized in that, it further includes a second fixing member, and a part of the first wire harness is fixed to a first side of the elastic member through the second fixing member, and the first side is a side of the elastic member away from the battery cell assembly.

10. The battery module according to claim 6, characterized in that, the housing includes a top wall and a bottom wall oppositely arranged along a third direction, the bottom wall bears the battery cell assembly, and the third direction is perpendicular to the first direction; along the third direction, a part of the first wire harness is arranged on the elastic member.

11. The battery module according to any one of claims 4 to 6, characterized in that, the battery module includes a second wire harness, the battery cell unit includes a second battery cell unit, and along the first direction, the first battery cell unit and the second battery cell unit are respectively located on the outermost sides of the battery cell assembly; the second wire harness is connected to the second battery cell unit, and the second wire harness and the elastic member are separately arranged.

12. The battery module according to claim 11, characterized in that, the second wire harness is fixed to at least one of the brackets.

13. The battery module according to claim 11 or 12, characterized in that, the battery module includes a second electrical connector, the second electrical connector is provided with a notch, and the electrode terminal of the second battery cell unit passes through the notch and is connected to a side of the second electrical connector facing away from the second battery cell unit.

14. The battery module according to claim 13, characterized in that, the battery module includes a third fixing member, the third fixing member fixes the second electrical connector and the bracket, and when observed along the third direction, there is a gap between the second electrical connector and the bracket of the second battery cell unit in a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

15. The battery module according to any one of claims 11 to 14, characterized in that, the second wire harness is in a stretchable state.

16. The battery module according to any one of claims 11 to 15, characterized in that, it further includes a sampling member, the sampling member includes a sampling terminal and a sampling wire harness, the sampling wire harness is connected to the elastic member, and the sampling wire harness is in a stretchable state.

17. The battery module according to claim 16, characterized in that, the sampling wire harness is fixed to at least one of the brackets.

18. The battery module according to claim 16 or 17, characterized in that, the elastic member includes a base portion, a buffer portion, and a connecting portion; the base portion is connected to the first battery cell unit, and the base portion is configured to apply pressure to the battery cell assembly; the buffer portion is connected to the base portion, and the buffer portion is configured to provide an expansion space for the battery cell assembly; the connecting portion is connected to the housing, and a part of the first wire harness is fixed to a first side of the connecting portion, and the first side is a side of the connecting portion facing away from the battery cell assembly.

19. The battery module according to claim 18, characterized in that, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are arranged along the third direction, the first connecting portion is connected to one side of the buffer portion, and the second connecting portion is connected to the other side of the buffer portion.

20. The battery module according to claim 19, characterized in that, Along the third direction, the first wire harness is fixed to the second connection part, and the sampling wire harness is fixed to the first connection part.

21. The battery module according to any one of claims 18 to 20, wherein, the housing includes a first side wall and a second side wall arranged along a second direction, and the first direction is perpendicular to the second direction; Along the second direction, there is a first gap between the second side wall and the base, and the first wire harness passes through the first gap.

22. The battery module according to claim 21, wherein, there is a second gap between the first side wall and the base, and the second wire harness passes through the second gap.

23. A battery pack, wherein, it includes a top cover and the battery module according to any one of claims 1 to 22, and is characterized in that the top cover is connected to the housing.

24. The battery pack according to claim 23, wherein, it further includes a circuit board, the circuit board is arranged on the top cover, and the first wire harness is connected to the circuit board.

25. An electrical device, wherein, it includes the battery pack according to claim 23 or 24.

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