WO2022267059A1

WO2022267059A1 - Battery pack and electrical device

Info

Publication number: WO2022267059A1
Application number: PCT/CN2021/102543
Authority: WO
Inventors: 夏君; 周权; 吴明杰
Original assignee: 东莞新能安科技有限公司
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-12-29
Also published as: CN117561635A

Abstract

The present application provides a battery pack (100), comprising a housing (10), a cell module (20), a first structural member (30), and a convex portion (40). The cell module (20) comprises a plurality of cells (21) stacked in a first direction. The housing (10) comprises a first side wall (111) and a second side wall (112) that is connected to the first side wall (111). The housing (10) covers the cell module (20). The cell module (20) further comprises a first side (a) and a second side (b) that are adjacent to one another. The first side (a) is disposed in the first direction, the first side wall (111) is disposed on the first side (a) of the cell module (20), and the second side wall (112) is disposed on the second side (b) of the cell module (20). In the first direction, the first structural member (30) is disposed between the cell module (20) and the first side wall (111). The convex portion (40) is located between the cell module (20) and the first side wall (111), the convex portion (40) comprises a first surface (41), the first structural member (30) and the first surface (41) are connected, and the first surface (41) extends to the second side wall (112). In the first direction, a first gap (31) is present between the first structural member (30) and the first side wall (111). The present application further relates to an electrical device. By employing the described battery pack (100), the extrusion deformation generated by the cell module (20) during expansion on the housing (10) can be reduced, thus having a buffer protection effect on the housing (10).

Description

Battery pack and electrical device

technical field

The present application relates to the technical field of battery manufacturing, in particular to a battery pack and an electrical device.

Background technique

In the existing battery module structure, in order to enhance the cycle performance of the battery, the method of pressurizing the battery cells is used to achieve this purpose. However, in the existing technical solutions, the foam in the battery core is deformed after long-term use and extrusion, which may cause the sealing surface of the plastic shell to fail, resulting in a decrease in the reliability and service life of the battery pack.

Contents of the invention

In view of this, it is necessary to provide a battery pack and an electrical device aimed at improving the reliability and service life of the battery pack.

An embodiment of the present application provides a battery pack, including a casing, a cell module, a first structural member, and a protrusion, the cell module includes a plurality of cells stacked along a first direction, the The housing includes a first side wall and a second side wall connected to the first side wall, and the housing covers the cell module. The cell module further includes adjacent first sides and second sides, the first side is disposed along the first direction, and the first side wall is disposed on the first side of the cell module , the second side wall is disposed on the second side of the cell module. Along the first direction, the first structural member is disposed between the cell module and the first side wall. The convex portion is located between the cell module and the first side wall, the convex portion includes a first surface, the first structural member is connected to the first surface, and the first surface extends To the second side wall, along the first direction, there is a first gap between the first structural member and the first side wall.

By arranging the first structural member between the cell module and the casing, when the cell module expands, the expansion force generated by the cell is transmitted to the first side wall and the second side wall of the casing through the first structural member. The junction of the side walls. The connection between the first side wall and the second side wall has greater strength and can withstand larger external forces. The battery module transmits the expansion force generated by it to this position through the first structural member, thereby improving the battery module. When expanding, the first side wall is directly squeezed to cause deformation of the shell. The first structural member is provided to protect the housing, improving the reliability and service life of the battery pack. In addition, a first gap is set between the first structural member and the first side wall, so that when the first structural member is squeezed during the expansion of the cell module, the first structural member can extend toward the first gap, thereby lifting the casing. The space utilization rate is improved, and the situation that the first structural member is directly pressed against the shell is also improved.

In a possible implementation manner, the protrusion is provided on the first side wall, and the protrusion and the first side wall are integrally formed.

By providing the convex portion on the first side wall, the first surface of the convex portion is connected to the first structural component. When the cell module expands, the first structural member can transmit the force generated by the cell module to the joint between the first side wall and the second side wall through the protrusion.

In a possible implementation manner, the first structural member extends to connect with the second side wall.

In a possible implementation manner, the protrusion further includes a second surface, the second surface is connected to the first surface and extends to the first side wall, and the first surface and the second There is an angle between the faces.

By setting the second surface, the second surface is connected to the first surface and extends to the first side wall. Further, the second surface is an inclined surface, and is inclined from the first surface to the direction of the first side wall. When the first structural component is assembled into the casing, the second surface can guide the first structural component.

In a possible implementation manner, the electric core has a first electric core, and the first electric core includes a first electrode assembly and a first packaging part covering the first electrode assembly, along the first direction Observe that the first structural member at least covers the first electrode assembly.

In a possible implementation manner, the first packaging part includes a first part and a second part. The first part includes: a first region that clamps the first electrode assembly together with the second part in the first direction; and is separated from the first electrode assembly when viewed along the first direction And a second area that is in contact with the second portion. Viewed along the first direction, the first structural member covers the first region.

In a possible implementation manner, at least a part of the first structural member overlaps with the second region.

In a possible implementation manner, the first part further includes a third area connected to the first area, and viewed along the first direction, the first structural member covers at least the first area and the third area.

In a possible implementation manner, the first cell further includes a first metal part, the first metal part is in contact with the first electrode assembly, and when viewed along the first direction, the first metal part A portion overlaps the first area and the second area and extends from the inside of the first packaging portion to the outside.

In a possible implementation manner, the first structural member covers the first region and at least partially overlaps with the first metal part in the first direction.

In a possible implementation manner, the thickness of the first structural member is smaller than the thickness of the electric core.

In a possible implementation manner, the thickness of the first structural member is greater than the thickness of the electric core.

In a possible implementation manner, the first structural member is connected to the battery module, and the force exerted by the first structural member on the battery module is greater than 98 Newtons.

By applying a force greater than 98 Newtons to the cell, the cycle life of the cell can be greatly improved.

In a possible implementation manner, the battery pack further includes an adapter and a circuit board, the battery cell is connected to the adapter, the adapter is connected to the circuit board, and connected to the first In a second direction perpendicular to one direction, the circuit board at least partially overlaps with the cell module.

The battery cell is connected to the circuit board through the adapter, and the adapter is connected to the circuit board, which improves the stability between the battery cell and the adapter, and the adapter and the circuit board.

In a possible implementation manner, the housing includes a first shell portion and a second shell portion connected to the first shell portion, and the first shell portion and the second shell portion include the first shell portion respectively. The one side wall and the second side wall, the first shell part and the second shell part accommodate the cell module, the adapter and the circuit board.

The battery module is accommodated together by the first shell part and the second shell part, which facilitates the assembly of the battery module and other structures.

In a possible implementation manner, along the first direction, the first side wall includes a first surface opposite to the first structural component, and the first surface is away from the first structural component.

In a possible implementation manner, the battery pack further includes a first protrusion protruding from the first surface.

In a possible implementation manner, the first convex portion is inclined relative to the first direction.

In a possible implementation manner, the Brinell hardness of the first structural member ranges from 60HBW to 150HBW.

Setting the Brinell hardness of the first structural member between 60HBW and 150HBW can ensure that when the cell module expands, the squeezed first structural member will not undergo large deformation and squeeze the shell, causing the shell to deformed.

In a possible implementation manner, the first structural member contains a metal material.

In a possible implementation manner, the first structural member contains aluminum.

In a possible implementation manner, the battery pack further includes another first structural member that clamps the battery module together with the first structural member.

In a possible implementation manner, the battery cell further has a second battery cell, and a second structural member is arranged between the first battery cell and the second battery core, and viewed along the first direction, the The first structural member covers the second structural member.

In a possible implementation manner, the first structural member is separated from the second battery core, and the second battery core includes a second electrode assembly and a second packaging part covering the second electrode assembly.

In a possible implementation manner, viewed along the first direction, the second structural member covers the first structural member.

In a possible implementation manner, the second structural member has a higher elastic coefficient than the first structural member.

In a possible implementation manner, viewed along the first direction, the second structural member at least covers the second electrode assembly.

In a possible implementation manner, the second packaging part includes a third part and a fourth part. The third part includes: a fourth region that clamps the second electrode assembly together with the fourth part in the first direction; A fifth area separated from and connected to the fourth portion.

In a possible implementation manner, viewed along the first direction, the second structural member covers the fourth region, and at least a part of the second structural member overlaps the fifth region.

In a possible implementation manner, the third part of the second packaging part has a sixth area between the fourth area and the fifth area.

In a possible implementation manner, viewed along the first direction, the second structural member at least covers the fourth region and the sixth region.

In a possible implementation manner, the second cell further includes a second metal part, the second metal part is in contact with the electrode assembly, and viewed along the first direction, the second metal part is in contact with the electrode assembly. The fourth area overlaps with the fifth area and extends from inside to outside of the second packaging part.

In a possible implementation manner, the second structural member covers the fourth region and at least partially overlaps with the second metal part in the first direction.

In a possible implementation manner, the second structural member contains an insulating material.

In a possible implementation manner, the second structural component contains a material different from that of the first structural component.

In a possible implementation manner, the second structural member is in contact with at least one of the first battery cell and the second battery cell.

In a possible implementation manner, the housing further has a plurality of recesses, and in a third direction perpendicular to the first direction, the recesses overlap with the electric core.

In a possible implementation manner, the housing further includes a first slot, and the first slot overlaps with the first structural member in the third direction.

The embodiment of the present application also provides a battery module, including a battery module and a casing covering the battery module, and the battery module includes a plurality of battery cells stacked along a first direction. The battery module further includes a first structural member disposed between the battery module and the casing in the first direction, the first structural member is in contact with the battery module connected to and separated from at least a portion of the housing. The embodiment of the present application further provides an electric device, the electric device includes a body and any one of the above-mentioned battery packs, and the body accommodates the battery pack.

In the battery pack and electrical device provided by the present application, the first structural member is arranged between the housing and the battery module, so that when the battery module expands, the expansion force generated by the first structural member is transmitted to the The connection between the first side wall and the second side wall prevents the cell module from directly pressing the housing, causing deformation of the housing. Improve the stability and service life of the battery pack.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a battery pack in an embodiment of the present application.

FIG. 2 is an exploded schematic view of the battery pack shown in FIG. 1 .

FIG. 3 is a schematic perspective view of the first shell portion of the housing in the battery pack shown in FIG. 2 .

FIG. 4 is a schematic cross-sectional view of the battery pack in FIG. 1 along the direction A-A.

FIG. 5 is a schematic cross-sectional view of the battery pack in FIG. 1 along the direction A-A in another embodiment.

FIG. 6 is a schematic perspective view of the three-dimensional structure of the cell module shown in FIG. 2 .

FIG. 7 is a schematic perspective view of the first battery cell in the battery cell module shown in FIG. 6 .

FIG. 8 is a schematic diagram of an exploded structure of the first cell shown in FIG. 7 .

FIG. 9 is a schematic front view of the first cell shown in FIG. 7 .

FIG. 10 is a schematic perspective view of the three-dimensional structure after the first structural member is attached to the first battery cell.

FIG. 11 is a schematic front view of the first structural member attached to the first battery cell.

FIG. 12 is an exploded schematic view of the battery cell, the first structural member and the buffer member shown in FIG. 2 .

FIG. 13 is a schematic cross-sectional view along the direction A-A of the cell module in FIG. 1 in an expanded state.

Figure 14 is a comparison of the cycle conditions of the cells under pressure and without pressure.

FIG. 15 is a schematic front view of the first structural member attached to the first battery cell in another embodiment of the present application.

Fig. 16 is a schematic front view showing that the area of the first structural member is larger than that of the second structural member in another embodiment of the present application.

FIG. 17 is a schematic front view of the stack of the first structural member, the first electric core and the second structural member in FIG. 16 .

Fig. 18 is a schematic front view showing that the area of the first structural member is smaller than that of the second structural member in another embodiment of the present application.

FIG. 19 is a schematic front view of the stack of the first structural member, the first electric core and the second structural member in FIG. 18 .

Fig. 20 is a schematic side view of another embodiment of the present application in which the width of the first structural member is smaller than the width of the first cell.

Fig. 21 is a schematic side view of another embodiment of the present application in which the width of the first structural member is greater than the width of the first cell.

Description of main component symbols

Battery Pack 100

Housing 10

First shell part 11

First side wall

111, 121

First Surface 1111

Second side wall

112, 122

Third side wall

113, 123

Concave 1121

Second shell part 12

Inclined part 13

Battery module 20

First side a

Second side b

Batteries 21

The first cell 21a

The thickness of the first cell D1

First Packaging Department 211a

Part One 2111a

Region 1 21111a

Second Area 21112a

The third area 21113a

Part Two 2112a

The fourth area 21121a

Fifth Area 21122a

The sixth area 21123a

The first electrode assembly 212a

First Metal Division 213a

Second metal part 213b

The second cell 21b

Second structural member 22

Pressurization cycle status A

Unpressurized cycle condition B

The first structural member 30

Thickness of the first structural member D2

First Clearance 31

convex part 40

First convex part 40a

Second convex part 40b

The first side 41

Second side 42

Adapter 50

Circuit board 60

detailed description

The following will describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them.

It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it can be set directly on the other component or there may be an intervening component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "rear", and similar expressions are used herein for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

An embodiment of the present application provides a battery pack, including a casing, a cell module, a first structural member, and a protrusion. The housing includes a first side wall and a second side wall connected to the first side wall. The cell module includes a plurality of cells stacked along a first direction. The casing covers the cell module. The cell module further includes adjacent first sides and second sides, the first side is disposed along the first direction, and the first side wall is disposed on the first side of the cell module , the second side wall is disposed on the second side of the cell module. Along the first direction, the first structural member is disposed between the cell module and the first side wall. The convex portion is located between the cell module and the first side wall, the convex portion includes a first surface, the first structural member is connected to the first surface, and the first surface extends to the second side wall. Along the first direction, there is a first gap between the first structural member and the first side wall.

By setting the first structural member between the battery module and the housing, the first structural member is respectively connected to the battery module, the first side wall and the second side wall, when the battery module expands, the battery The expansion force generated by the core is transmitted to the junction of the first side wall and the second side wall of the casing through the first structural member. The connection between the first side wall and the second side wall has greater strength and can withstand larger external forces. The battery module transmits the expansion force generated by it to this position through the first structural member, thereby improving the battery module. When expanding, the first side wall is directly squeezed to cause deformation of the shell. The first structural member is provided to protect the housing, improving the reliability and service life of the battery pack. In addition, a first gap is set between the first structural member and the first side wall, so that when the first structural member is squeezed during the expansion of the cell module, the first structural member can extend toward the first gap, thereby lifting the casing. The space utilization rate is improved, and the situation that the first structural member is directly pressed against the shell is also improved.

Some embodiments will be described below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIG. 1 and FIG. 2 , the present embodiment provides a battery pack 100, including a casing 10, a cell module 20 and a first structural member 30, and the cell module 20 is arranged in the casing 10 , the first structural member 30 is disposed between the casing 10 and the cell module 20 . When the cell module 20 expands, the cell module 20 can transmit the expansion force generated by it to the casing 10 through the first structural member 30 , and the first structural member 30 The expansion force generated by the cell module 20 is transmitted to the position where the casing 10 can withstand a relatively large external force. Wherein, the connection position of the adjacent two side walls of the housing 10 has greater structural strength than other plane positions of the housing 10, and the first structural member 30 transmits the expansion force to the adjacent two sides. The connection position of the wall, so that the expansion force is introduced to the position where the structural strength of the shell 10 is stronger, so as to improve the situation where the battery module 20 squeezes the shell 10 and deforms the shell 10 .

Referring to FIG. 1 , FIG. 2 and FIG. 4 , the housing 10 includes a first shell portion 11 and a second shell portion 12 , and the first shell portion 11 is connected to the second shell portion 12 . The battery pack 100 accommodates the cell module 20 inside through the first shell portion 11 and the second shell portion 12 , so as to protect the cell module 20 .

In some embodiments, the first shell part 11 and the second shell part 12 are fixed by welding, so as to form a whole. The connection by welding improves the stability of the overall structure of the housing 10 , and the first shell part 11 and the second shell part 12 are less prone to loosening. For example, the first shell portion 11 includes an insulating material, the second shell portion 12 includes an insulating material, and the first shell portion 11 and the second shell portion 12 are fixed by ultrasonic welding. For another example, the first shell part 11 includes a metal material, the second shell part 12 includes a metal material, and the first shell part 11 and the second shell part 12 are fixed by laser welding.

In other embodiments, the first shell part 11 and the second shell part 12 can also be fixed in other ways, for example, they can also be fixed by using fasteners, such as screws.

In order to better describe each structure, it will be described in conjunction with X, Y, and Z coordinate axes, wherein the X, Y, and Z coordinate axes are perpendicular to each other. The first direction X is the direction in which the cells 21 are stacked. The third direction Y is a direction in which the first shell part 11 and the second shell part 12 are arranged opposite to each other. The second direction Z is perpendicular to the first direction X and the third direction Y.

The first shell portion 11 includes a first side wall 111 and a second side wall 112 connected to the first side wall 111, and the cell module 20 includes a first side a arranged along a first direction X , wherein, the first side wall 111 is disposed on the first side a of the cell module 20 . The cell module 20 includes a second side b adjacent to the first side a, the second side wall 112 is disposed on the second side b of the cell module 20, and the cell module The first side a and the second side b of 20 are adjacent. The first shell portion 11 further includes a third side wall 113 , and the third side wall 113 is respectively connected to the first side wall 111 and the second side wall 112 . Further, the first side wall 111 includes a first surface 1111 opposite to the first structural member 30 , and the first surface 1111 is separated from the first structural member 30 . The first surface 1111 is the inner surface of the first side wall 111 close to the cell module 20 , when the first structural member 30 is assembled into the housing 10 , the first structural member 30 and the first surface 1111 are separated from each other.

The first shell portion 11 includes two first sidewalls 111 and two third sidewalls 113 . Specifically, the two first side walls 111 are respectively arranged at opposite ends of the second side wall 112, and the two third side walls 113 are respectively arranged at the other opposite ends of the second side wall 112. . There is a first angle between the first side wall 111 and the second side wall 112, and the range of the first angle is greater than 0° and less than 180°. There is a second angle between the third side wall 113 and the second side wall 112 , and the range of the second angle is greater than 0° and less than 180°.

The first sidewall 111 , the second sidewall 112 and the third sidewall 113 are vertically arranged in pairs, so that the first shell part 11 is a hollow square structure without a cover. The first side wall 111 , the second side wall 112 and the third side wall 113 are integrally formed. The two first side walls 111 are arranged opposite to each other along the first direction X, and the two third side walls 113 are arranged opposite to each other along the second direction Z, and the second direction Z is perpendicular to the first direction X and the third direction Y.

It can be understood that, in other embodiments, the first side wall 111 and the third side wall 113 may be inclined to the second side wall 112 .

Please refer to FIG. 3 , in one embodiment, the second side wall 112 is provided with a concave portion 1121 , and the cell module 20 is adapted to the concave portion 1121 . When the battery module 20 is assembled into the housing 10, the second side wall 112 positions the battery module 20 through the recess 1121, which can restrict the battery module 20 moves.

In one embodiment, an adhesive member (not shown in the figure) is provided in the concave portion 1121 , and the adhesive member fixes the battery cell 21 . An adhesive member is provided in the concave portion 1121 to fix the cell module 20 and improve the stability of the cell module 20 assembled in the casing 10 .

Specifically, the bonding member is glue, and the glue is applied in the concave portion 1121 for bonding the cell module 20 . It can be understood that, in other embodiments, the type of the adhesive member is not limited thereto, for example, it can also be replaced by an adhesive tape with equivalent functions or effects.

Referring to FIG. 3 and FIG. 4 , in one embodiment, the battery pack 100 further includes a protrusion 40 extending from the first surface 1111 , and the protrusion 40 is connected to the first side wall 111 . For example, the protrusion 40 is disposed on the first side wall 111 , and the protrusion 40 is disposed between the first side wall 111 and the cell module 20 . When the cell module 20 and the first structural member 30 are assembled into the housing 10 , the first structural member 30 is against the protrusion 40 .

Specifically, the protrusion 40 includes a first surface 41 extending to the second side wall 112 . The first structural member 30 is connected to the first surface 41 , and one end of the protrusion 40 extends to the surface of the second side wall 112 . Optionally, the first surface 41 is parallel to the first side wall 111 . Wherein, "parallel" should be understood as including the case of being completely parallel and the case of a deviation of 0° to ±5° between the two.

The protrusion 40 also includes a second surface 42 , optionally, the second surface 42 can be used to guide the first structural member 30 . The second surface 42 is connected to the first surface 41, and the second surface 42 extends to the first side wall 111, and there is a third clamp between the first surface 41 and the second surface 42. angle, and the range of the third included angle is greater than 180° but less than 270°. Compared with the first surface 41 , the second surface 42 is an inclined surface, and the second surface 42 is inclined from the first surface 41 toward the first sidewall 111 . When the first structural member 30 is assembled to the first shell portion 11, the second surface 42 guides the first structural member 30 so that the first structural member 30 can enter smoothly Inside the first shell part 11.

In one embodiment, a plurality of protrusions 40 may be disposed on the first side wall 111 .

Specifically, the convex portion 40 may include a first convex portion 40a and a second convex portion 40b. The first protrusion 40 a protrudes from the first surface 1111 , and part of the first protrusion 40 a is inclined relative to the first direction X. As shown in FIG. The first structural component 30 is connected to the first protrusion 40 a and separated from the first surface 1111 .

The second protrusion 40b protrudes from the first surface 1111 and is inclined relative to the first direction X. As shown in FIG. Moreover, the inclination directions of the first convex portion 40a and the second convex portion 40b with respect to the first direction X are the same, so that the first convex portion 40a and the second convex portion 40b can guide the first convex portion 40a together. A structural member 30 . The first structural component 30 is connected to the second protrusion 40 b and separated from the first surface 1111 . Optionally, the inclination angles of the first convex portion 40a and the second convex portion 40b relative to the first direction X are the same. Optionally, the inclination angles of the first convex portion 40a and the second convex portion 40b relative to the first direction X are different.

In one embodiment, each of the first side walls 111 is provided with three sets of protrusions 40 at a position close to the second side wall 112, and the three sets of protrusions 40 are arranged symmetrically, and each set of the protrusions 40 is arranged symmetrically. The protrusions 40 include a first protrusion 40a and a second protrusion 40b, respectively. Optionally, the inclination angles of the three groups of the protrusions 40 relative to the first direction X are the same. Optionally, the inclination angles of the three groups of the protrusions 40 relative to the first direction X are different. The structural strength at the connection position of the first side wall 111 and the second side wall 112 is stronger than other positions of the first side wall 111 and the second side wall 112 , and the protrusion 40 At this position, when the cell module 20 expands, the first structural member 30 can transmit the expansion force to the first side wall 111 and the second side through the protrusion 40 At the connection position of the wall 112, the structurally stronger position of the first shell part 11 can bear the expansion force, so as to reduce the deformation of other positions of the first shell part 11 due to the extrusion force of the expansion force.

It can be understood that, in other embodiments, the number of sets of the protrusions 40 provided at the junction of the first side wall 111 and the second side wall 112 is not limited thereto. For example, four groups, five groups, etc. can also be set.

Please refer to FIG. 3 , in an embodiment, the housing 10 further includes an inclined portion 13 . The inclined portion 13 is disposed on the third side wall 113 , and optionally, the inclined portion 13 can be used to guide the cell module 20 . After the battery module 20 is assembled into the first shell part 11, the inclined part 13 can also press the battery module 20, and the battery module 20 is pressed through the concave part 1121. 20 is positioned, the inclined portion 13 also plays a role in positioning the battery module 20, so as to further improve the stability of the assembly of the battery module 20.

It can be understood that, the convex portion 40 and the inclined portion 13 and the first shell portion 11 may be integrally formed.

Referring to FIG. 2 together with FIG. 3 and FIG. 4 , in this embodiment, the structures of the first shell part 11 and the second shell part 12 are basically the same. The second shell portion 12 also includes a first side wall 121 , a second side wall 122 and a third side wall 123 . The difference is that the second shell part 12 is provided with buckles (not shown in the figure), and the first shell part 11 is provided with a card slot (not shown in the figure). When the first shell part 11 and the second shell part 12 are assembled, the first shell part 11 and the second shell part 12 are fastened through buckles and slots and then welded, And the first side wall 111 of the first shell part 11 is in contact with the first side wall 121 of the second shell part 12, and the second side wall 112 of the first shell part 11 is in contact with the second shell part 11. The second side wall 122 of the part 12 is located on opposite sides of the cell module 20, the third side wall 113 of the first shell part 11 is in contact with the third side wall 123 of the second shell part 12 .

The structure of the second shell part 12 is substantially the same as that of the first shell part 11 , and the specific structure of the second shell part 12 will not be repeated here.

Please refer to FIG. 6 , the cell module 20 includes a plurality of cells 21 stacked along the first direction X. In order to describe the cells 21 in more detail, the cells in the cell module 20 will be One of the batteries 21 will be described.

The cell module 20 includes a first cell 21 a, and the first cell 21 a is one of the plurality of cells 21 . When the cell module 20 is assembled into the casing 10 , the first cell 21 a is connected to the first structural member 30 . Viewed along the first direction X, the first structural member 30 at least covers the first electric core 21a.

Referring to FIG. 7 and FIG. 8 , the first battery cell 21a includes a first packaging part 211a and a first electrode assembly 212a, and the first packaging part 211a covers the first electrode assembly 212a.

The first packaging part 211a includes a first part 2111a and a second part 2112a, the first part 2111a is connected to the second part 2112a, and the first part 2111a and the second part 2112a can be folded along the connecting position, Such that the first part 2111a and the second part 2112a overlap to cover the first electrode assembly 212a.

Specifically, the first portion 2111a includes a first region 21111a and a second region 21112a. The second portion 2112a includes a fourth area 21121a and a fifth area 21122a. In the first direction X, the first region 21111a and the fourth region 21121a clamp the first electrode assembly 212a together. And viewed along the first direction X, the second region 21112a is in contact with the fifth region 21122a, and both the second region 21112a and the fifth region 21122a are in contact with the first electrode assembly 212a Leave. Both the first region 21111a and the fourth region 21121a are regions corresponding to the first electrode assembly 212a, and the second region 21112a and the fifth region 21122a are both away from all electrodes along the second direction Z. The area of the first electrode assembly 212a is described above. Further, viewed along the first direction X, the first structural member 30 covers the first region 21111a and the fourth region 21121a. Optionally, when an external force is applied to the first cell 21a In other words, the first structural member 30 covers the first region 21111a, so as to improve the situation that the first cell 21a generates local stress and causes lithium precipitation.

In one embodiment, the first part 2111a further includes a third region 21113a, viewed along the first direction X, the third region 21113a is connected to the periphery of the first region 21111a. Optionally, viewed along the first direction X, the first structural member 30 at least covers the first region 21111a and the third region 21113a. Specifically, the third region 21113a is a part near the edge of the first part 2111a in the third direction Y. And in the finally formed first battery cell 21a, viewed along the first direction X, the third region 21113a has an arc-shaped structure. Optionally, viewed along the first direction X, the first structural member 30 at least covers the first region 21111a and the third region 21113a, which can increase the contact area with the first cell 21a. The third direction Y is perpendicular to the first direction X and the second direction Z at the same time.

In one embodiment, the second portion 2112a further includes a sixth region 21123a, viewed along the first direction X, the sixth region 21123a is connected to the periphery of the fourth region 21121a. Specifically, the sixth region 21123a is the part near the edge of the second part 2112a in the third direction Y. And in the finally formed first cell 21a, viewed along the first direction X, the sixth region 21123a has an arc-shaped structure.

When the cell module 20 is assembled into the housing 10 , the arc-shaped third region 21113 a and sixth region 21123 a are adapted to the concave portion 1121 of the second side wall 112 . For example, the third area 21113a and the sixth area 21123a are set at the recess 1121 and bonded to the recess 1121 by the adhesive, so as to play a role in the first cell 21a Fixed role.

Please refer to FIG. 8 and FIG. 9 , in one embodiment, the first cell 21a further includes a first metal part 213a and a second metal part 213b, and the first metal part 213a and the second metal part 213b All are in contact with the first electrode assembly 212a. Viewed along the first direction X, both the first metal part 213a and the second metal part 213b overlap with the first area 21111a and the second area 21112a, and from the inside of the first packaging part 211a Extend outward.

Please refer to FIG. 10 and FIG. 11 , further, the first structural member 30 covers the first region 21111a, and in the first direction X, the first structural member 30 is at least partially connected to the first metal part 213a and the second metal part 213b overlap. The first structural member 30 increases the area in contact with the first electric core 21a, so that the first electric core 21a transmits the force generated by it to the first structural member 30 more effectively.

Please refer to FIG. 6 and FIG. 12 , the battery cell 21 also has a second battery cell 21b, the second battery cell 21b is arranged on the side of the first battery cell 21a away from the first structural member 30, and , the first cell 21a and the second cell 21b are stacked along the first direction X. The structure of the second battery cell 21b is the same as that of the first battery cell 21a, and will not be repeated here.

The cell module 20 further includes a second structural member 22, and the second structural member 22 is disposed between the first cell 21a and the second cell 21b.

Optionally, the second structural member 22 is foam, and when the battery module 20 is placed in the housing 10, a certain pressure is applied to the battery module 20, so that the second The compression of the structural member 22 is greater than 4.9% and less than 21.1%. Wherein, the compression amount is the ratio of the compressed thickness of the second structural member 22 to the uncompressed thickness. Setting the compression amount of the second structural member 22 within the above range is beneficial to improve the cycle performance of the battery pack 100 . When the electric core 21 expands, it compresses the second structural member 22 , and the second structural member 22 provides an expansion space for the electric core 21 .

In other embodiments, the second structural member 22 can also be replaced with other structures with equivalent functions or functions. Moreover, the cell module 20 includes a plurality of the second structural members 22 , and each of the second structural members 22 is disposed between two adjacent cells 21 .

Please refer to FIG. 2 and FIG. 13, the battery pack 100 includes two first structural members 30, each of the first structural members 30 is respectively arranged on the battery module 20 and the first side wall Between 111. The first structural member 30 is connected to the battery cell 21 and the protrusion 40 respectively, so that when the battery module 20 expands, the protrusion 40 can bear against the first structural member 30 .

Please refer to FIG. 13 . FIG. 13 is a structural schematic diagram of the cell module 20 being expanded and compressed to deform the first structural member 30 . In one embodiment, a first gap 31 is provided between the first structural member 30 and the first side wall 111 . When the cell module 20 expands and squeezes the first structural member 30 and deforms the first structural member 30 , the first structural member 30 can extend toward the first gap 31 , the first structural member 30 can be deformed to the first gap 31, on the one hand, the space utilization rate of the housing 10 is improved, and on the other hand, the squeeze between the first structural members 30 can also be improved. The case of pressing the housing 10 reduces the risk of deformation of the housing 10 .

In an embodiment, when the first structural member 30 is in contact with the first electric core 21a, the force applied by the first structural member 30 to the first electric core 21a may be greater than 98 Newtons. By applying a force greater than 98 Newtons to the first battery cell 21a, the cycle life of the first battery cell 21a can be greatly improved.

Please refer to Fig. 14, Fig. 14 shows the comparison of the cycle conditions of the battery core 21 under pressure and without pressure, wherein the ordinate indicates the upper limit of the capacity of the battery core 21, and the abscissa indicates the capacity of the battery core 21. The cycle performance of the battery cell 21 is tested under the conditions of 25±2°C and a voltage of 2.8V to 4.2V. The line indicated by A indicates the cycle status of the battery cell 21 without pressurization, and B The indicated line is the cycle state of the battery cell 21 under pressure.

In one embodiment, the Shore hardness C of the first structural member 30 ranges from 60HBW to 150HBW. Setting the Shore hardness C of the first structural member 30 between 60HBW and 150HBW can ensure that when the cell module 20 expands, the squeezed first structural member 30 has a certain hardness , it will not be squeezed by the expanded cell module 20 to cause large deformation and squeeze the casing 10 , so that the casing 10 will be deformed.

Please refer to FIG. 15. In one embodiment, viewed along the stacking direction of the electric cores 21, that is, viewed along the first direction X, the area of the first structural member 30 is greater than or equal to that of the first electric core 21a. The sum of the areas of the first region 21111a and the third region 21113a. The area of the first structural member 30 is set to be greater than or equal to the sum of the areas of the first region 21111a and the third region 21113a, so that when the first structural member 30 is connected to the first cell 21a, it can A relatively uniform force is applied during the pressurization process of the first battery cell 21a, and the cycle condition of the whole first battery cell 21a after pressurization is also more stable.

Please refer to FIG. 16 , in one embodiment, viewed along the stacking direction of the electric cores 21 , that is, viewed along the first direction X, the area of the first structural member 30 is larger than that of the second structural member 22 area. Setting the area of the first structural member 30 to be larger than the area of the second structural member 22 reduces the occurrence of the first structural member 30 not covering the second structural member 22 and causing the battery core 21 to easily Local stress is generated, resulting in lithium deposition in the battery cell 21 , thereby improving the safety performance of the battery cell 21 . The area of the first cell 21 a is between the first structural member 30 and the second structural member 22 , as shown in FIG. 17 .

Please refer to FIG. 18 , in one embodiment, viewed along the stacking direction of the battery cells 21 , that is, viewed along the first direction X, the area of the first structural member 30 is smaller than that of the second structural member 22 area. The area of the first cell 21 a is between the first structural member 30 and the second structural member 22 , as shown in FIG. 19 .

Please refer to FIG. 4 and FIG. 20. In one embodiment, along the first direction X, the thickness of the first cell 21a is D1, the thickness of the first structural member 30 is D2, and the first structural member The thickness D2 of 30 is smaller than the thickness D1 of the first cell 21a. Setting the thickness D2 of the first structural member 30 to be smaller than the thickness D1 of the first electric core 21a can improve the space occupied by the first structural member 30 in the housing 10 and reduce the The overall volume of the battery pack 100.

Please refer to FIG. 5 and FIG. 21. In another embodiment, along the first direction X, the thickness of the first cell 21a is D1, the thickness of the first structure 30 is D2, and the first structure The thickness D2 of the component 30 is greater than the thickness D1 of the first cell 21a. Setting the thickness D2 of the first structural member 30 to be greater than the thickness D1 of the first electric core 21a can improve the overall strength of the first structural member 30 so as to be able to accept the energy transmitted by the first electric core 21a. More external force.

Please refer to FIG. 2 again, the battery pack 100 further includes an adapter 50 and a circuit board 60, and the adapter 50 and the circuit board 60 are housed in the first shell 11 and the second shell. within 12. The cell 21 is connected to the adapter 50, and the adapter 50 is connected to the circuit board 60. Further, the adapter 50 is a copper sheet, and the circuit board 60 is a circuit board. The battery core 21 is connected to the adapter 50 by welding, and the adapter 50 is connected to the circuit board 60 by welding. The connection by welding improves the stability of the connection between the battery core 21 and the adapter 50 , and the adapter 50 and the circuit board 60 . Further, along the second direction Z, the circuit board 60 at least partially overlaps with the cell module 20 .

It can be understood that, in other embodiments, other ways can also be used for connection between the battery core 21 and the adapter 50 , and between the adapter 50 and the circuit board 60 . For example, use fasteners to connect them.

When the battery module 20 is assembled into the housing 10, the adapter 50 connected to the battery 21 and the circuit board 60 connected to the adapter 50 are also accommodated in the housing. 10 , the housing 10 can also protect the circuit board 60 .

Please combine Figure 1 and Figure 2 again, the process of assembling the cell module 20 into the housing 10 is as follows:

A plurality of the electric cores 21 and a plurality of the second structural members 22 are stacked, a second structural member 22 is provided between two adjacent electric cores 21, and two adjacent electric cores 21 The cell module 20 can be formed by bonding and fixing the second structural member 22 .

Then the first structural member 30 is arranged on opposite sides of the battery module 20, and the first structural member 30 can be connected to the battery cells 21 in the battery module 20 by bonding. . The cell module 20 is protected and pressurized by the first structural member 30 .

Two adjacent battery cells 21 are connected through the adapter 50 , and two adjacent battery cells 21 are connected to the adapter 50 by welding. Then the adapter 50 is connected to the circuit board 60 , and the adapter 50 is connected to the circuit board 60 by welding.

Then, for example, a mechanical arm is used to squeeze the first structural member 30 arranged on both sides of the battery module 20 along the stacking direction of the battery cell 21, and the battery module provided with the first structural member 30 20 is assembled into the first shell part 11 or the second shell part 12 . Wherein, the convex portion 40 of the first shell portion 11 or the second shell portion 12 can guide the first structural member 30, and the inclined portion 13 can guide the cell module 20 and position until the cell module 20 and the first structural member 30 are assembled into the first shell part 11 or the second shell part 12 .

It can be understood that, in other embodiments, the mechanical arm can also be replaced with other structures having equivalent functions or functions.

After assembling the cell module 20 provided with the first structural member 30 to the first shell part 11 or the second shell part 12, release the mechanical arm, and the cell module 20 starts to expand, Expand to match the size of the first shell part 11 or the second shell part 12 . Moreover, the third area 21113 a of the battery cell 21 corresponds to the recess 1121 , and the adhesive member provided at the recess 1121 is used to bond and fix the battery cell 21 .

Finally, after the first shell part 11 and the second shell part 12 are snapped together, they are connected by welding.

Another embodiment of the present application further provides an electric device, the electric device includes a body and the battery pack 100 in any one of the above embodiments, and the body accommodates the battery pack 100 . The electric device includes the battery pack 100 in the above embodiment, and thus has all the beneficial effects of the battery pack 100 , which will not be repeated here.

The electric device can be an electric vehicle, an electric bicycle, an electric car, and the like. It can be understood that, in other embodiments, the type of the electric device is not limited thereto, and may be replaced by an electric cleaning tool, such as a weeder.

To sum up, in the embodiment of the present application, the battery pack 100 and the electrical device are provided. The protruding portion 40 is provided at the connection position between the first side wall 121 and the second side wall 122 . The first surface 41 of the protrusion 40 is connected to the first structural member 30 , and the first structural member 30 is connected to the cell module 20 . During the expansion process of the cell module 20 , the cell module 20 transmits the expansion force generated by the first structural member 30 to the first side wall 111 through the

protrusion

40 , 121 and the

second side wall

112, 122, the structure of this connection position is stronger than other positions of the

first side wall

111, 121, and can withstand greater extrusion force, thereby reducing the When the cell 21 expands, it presses against other positions of the

first side walls

111 and 121 , which plays a good role in buffering and protecting the first shell portion 11 and the second shell portion 12 . At the same time, the second surface 42 of the protrusion 40 acts as a guide for the first structural member 30, so that the first structural member 30 can be assembled to the first shell portion 11 or the first structural member 30 more smoothly. Inside the second shell part 12.

In addition, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application, rather than to limit the present application. Appropriate alterations and variations of these fall within the scope of the disclosure of this application.

Claims

A battery pack comprising:

A cell module, including a plurality of cells stacked along the first direction;

A casing including a first side wall and a second side wall connected to the first side wall, the casing covering the cell module;

It is characterized in that the battery module includes adjacent first sides and second sides, the first side is arranged along the first direction, and the first side wall is arranged on the side of the battery module. the first side, the second side wall is disposed on the second side of the cell module; and

A first structural member, along the first direction, the first structural member is disposed between the cell module and the first side wall;

a convex portion located between the cell module and the first side wall, the convex portion includes a first surface, the first structural member is connected to the first surface, and the first surface extends to For the second side wall, along the first direction, there is a first gap between the first structural member and the first side wall.
The battery pack according to claim 1, wherein the protrusion is provided on the first side wall, and the protrusion and the first side wall are integrally formed.
The battery pack according to claim 2, wherein the first structural member extends to connect with the second side wall.
The battery pack according to claim 2, wherein the protrusion further comprises a second surface, the second surface is connected to the first surface and extends to the first side wall, and the first There is an included angle between the surface and the second surface.
The battery pack according to claim 1, wherein the battery cell has a first battery cell, and the first battery cell includes a first electrode assembly and a first packaging part covering the first electrode assembly, Viewed along the first direction, the first structural member at least covers the first electrode assembly.
The battery pack according to claim 5, wherein the first packaging part comprises a first part and a second part;

The first part includes:

co-clamping a first region of the first electrode assembly with the second portion in the first direction;

a second region separated from the first electrode assembly and contiguous with the second portion when viewed along the first direction;

Viewed along the first direction, the first structural member covers the first region.
The battery pack according to claim 6, wherein the first part further includes a third area connected to the first area, and when viewed along the first direction, the first structural member covers at least the the first area and the third area.
The battery pack according to claim 6, wherein the first battery cell further comprises a first metal part, the first metal part is in contact with the first electrode assembly, and viewed along the first direction , the first metal part overlaps the first region and the second region and extends from the inside of the first packaging part to the outside.
The battery pack according to claim 8, wherein the first structural member covers the first region and at least partially overlaps with the first metal part in the first direction.
The battery pack according to claim 1, characterized in that, along the first direction, the thickness of the first structural member is smaller than the thickness of the battery core.
The battery pack according to claim 1, characterized in that, along the first direction, the thickness of the first structural member is greater than the thickness of the battery core.
The battery pack according to claim 1, wherein the first structural member is connected to the battery module, and the force applied by the first structural member to the battery module is greater than 98 Newtons.
The battery pack according to claim 1, wherein the battery pack further comprises an adapter and a circuit board, the battery cell is connected to the adapter, and the adapter is connected to the circuit board , in a second direction perpendicular to the first direction, the circuit board at least partially overlaps with the cell module.
The battery pack according to claim 13, wherein the housing comprises a first shell portion and a second shell portion connected to the first shell portion, the first shell portion and the second shell portion The part respectively includes the first side wall and the second side wall, and the first shell part and the second shell part accommodate the cell module, the adapter and the circuit board.
The battery pack according to claim 14, wherein, along the first direction, the first side wall includes a first surface opposite to the first structural member, and the first surface is opposite to the first structure. A structural member is separated.
The battery pack according to claim 15, wherein the battery pack further comprises a first protrusion protruding from the first surface.
The battery pack according to claim 16, wherein the first protrusion is inclined relative to the first direction.
The battery pack according to claim 16 or 17, wherein the first structural member is in contact with the first protrusion and is separated from the first surface.
The battery pack according to claim 1, wherein the Brinell hardness of the first structural member ranges from 60HBW to 150HBW.
The battery pack according to claim 5, wherein the battery cell also has a second battery cell, a second structural member is arranged between the first battery cell and the second battery cell, and along the Viewed from a first direction, the first structural member covers the second structural member.
The battery pack according to claim 5, wherein the battery cell also has a second battery cell, a second structural member is arranged between the first battery cell and the second battery cell, and along the Viewed from the first direction, the second structural member covers the first structural member.
An electrical device, characterized in that the electrical device comprises a body and the battery pack according to any one of claims 1 to 21, the body accommodates the battery pack.