CN218602678U

CN218602678U - Connection piece, battery module and battery package

Info

Publication number: CN218602678U
Application number: CN202220921227.XU
Authority: CN
Inventors: 周冠宇; 林金艺
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2023-03-10
Anticipated expiration: 2032-04-20

Abstract

The application relates to the technical field of energy storage devices, and discloses a connecting sheet, a battery module and a battery pack, wherein the connecting sheet comprises a sheet-shaped first substrate and a sheet-shaped second substrate, the first substrate and the second substrate are stacked to form a double-layer structure, and compared with a single-layer structure, the connecting sheet increases an overcurrent section, so that the overcurrent capacity is improved; compared with the scheme of increasing the overcurrent section through thickening, the first base body and the second base body can adopt thin structures respectively under the condition that the overcurrent sectional areas are the same, so that the rigidity can be effectively reduced, the stress deformation is easier, the stress damage of the joint caused by stress concentration is avoided, and the safety and the reliability of the battery module are effectively improved. The battery module and the battery pack with the connecting sheet also have the advantages.

Description

Connection piece, battery module and battery package

Technical Field

The application relates to the technical field of energy storage devices, in particular to a connecting sheet, a battery module and a battery pack.

Background

In the battery module, usually, a plurality of battery cores are connected in series and/or in parallel through the connecting sheet to satisfy different voltage and capacity demands, therefore, the connection stability, the overcurrent capacity and the like of the connecting sheet directly relate to the stability and the safety of the battery module. And among the present battery module, for satisfying the requirement that electric core high magnification overflows, the connection piece sets up comparatively thickly usually to increase the cross sectional area that overflows, but increased the rigidity of connection piece simultaneously, lead to adaptability deformability poor, the junction atress is too big and easily takes place the fracture.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a connecting piece, can improve the ability of overflowing and effectively reduce rigidity, improves the connection stability of connecting piece.

The embodiment of the application also provides a battery module with the connecting sheet.

The embodiment of the application also provides a battery pack with the battery module.

The connecting piece of the embodiment of the first aspect of the application comprises a first substrate and a second substrate, wherein the first substrate and the second substrate are arranged in a stacked mode and connected with each other, and the first substrate and the second substrate are arranged in a stacked mode: the first base body comprises a first buffer part and first connecting parts positioned on two sides of the first buffer part; the second base body comprises a second buffer part and second connecting parts positioned on two sides of the second buffer part; the first connecting portion and the second connecting portion are used for connecting a pole of the battery cell.

The connecting piece of this application first aspect embodiment has at least following beneficial effect: the first substrate and the second substrate are stacked to form a double-layer structure, and compared with a single-layer structure, the overcurrent cross section is increased, so that the overcurrent capacity is improved; compare with the scheme through the thickening in order to increase the cross-section that overflows, under the same condition of cross-sectional area that overflows, first base member and second base member can adopt thinner structure respectively, can effectively reduce rigidity, and first buffer portion and second buffer portion change in the atress deformation to effectively avoid stress concentration to lead to the junction atress of electric core utmost point post and connection piece to damage.

According to some embodiments of the application, the first substrate and the second substrate are formed by folding the same metal sheet along a set folding line, the position of the folding line forms a joint, and the first substrate and the second substrate are connected through the joint.

According to some embodiments of the present application, the first buffer portion includes a first overflowing section and first bending sections located at both sides of the first overflowing section, and both sides of the first overflowing section are connected to the first connecting portion through the first bending sections, respectively; the second buffer part comprises a second overflowing section and second bending sections located on two sides of the second overflowing section, and two sides of the second overflowing section are connected to the second connecting part through the second bending sections respectively.

According to some embodiments of the present application, the second buffer portion is positioned in alignment with the first buffer portion.

According to some embodiments of the present application, the first and second flow-passing sections are sheet-like structures.

According to some embodiments of the present application, the first connection portion and the second connection portion are sheet-like structures.

According to some embodiments of the present application, each of the first connection parts is provided with a first through hole penetrating in a thickness direction of the first base, and each of the second connection parts is provided with a second through hole penetrating in a thickness direction of the second base, the first through hole being aligned with the second through hole.

According to some embodiments of the application, each first connecting portion still is provided with the constant head tank, the constant head tank certainly first connecting portion deviate from the surface depression of second connecting portion forms, first through-hole communicate in the constant head tank.

The battery module of this application second aspect embodiment, including a plurality of electric cores and the connection piece of above-mentioned first aspect embodiment, it is a plurality of electric core arranges along setting for the direction, and is adjacent the utmost point post of electric core passes through the connection piece is established ties or is parallelly connected.

The battery module of this application second aspect embodiment has following beneficial effect at least: the battery module adopts the connection piece of above-mentioned first aspect embodiment to realize the series connection or parallelly connected of a plurality of electric cores to the messenger satisfies the user demand, and this connection piece can avoid increasing rigidity when increasing the cross-section that overflows, thereby improves the ability of overflowing and improves the stability that connection piece and electric core utmost point post are connected, guarantees the stability and the security of battery module.

The battery pack of the embodiment of the third aspect of the present application comprises a box body and the battery module of the embodiment of the second aspect, wherein the box body is provided with a containing cavity; the battery module is accommodated in the accommodating cavity.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic view of a connecting piece according to an embodiment of the present application;

FIG. 2 is a schematic view of the tab shown in FIG. 1 in the direction A;

FIG. 3 is a schematic view of the connecting tab shown in FIG. 1 in the direction B;

FIG. 4 is an enlarged view of a portion of FIG. 3 at C;

FIG. 5 is a schematic view of another angle of the connecting piece according to the embodiment of the present application;

fig. 6 is a schematic view illustrating a partial structure of a battery module according to an embodiment of the present disclosure;

fig. 7 is a top view of fig. 6.

Reference numerals are as follows:

a battery cell 100 and a pole 101;

a connecting sheet 200;

a first base 210, a first connection portion 211, a first buffer portion 212, a first flow passage section 213, a first bending section 214, a first through hole 215, and a positioning groove 216;

a second base 220, a second connecting portion 221, a second buffer portion 222, a second flow passage section 223, a second bending section 224, and a second through hole 225;

the engagement portion 230.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, several means are one or more, and the above, below, within and the like are understood to include the present numbers. The description to first, second, etc. is only for the purpose of distinguishing technical features, and should not be interpreted as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Among the present battery module, adopt thinner connection piece, can have the flexibility of preferred to easily atress warp, reduce the stress of junction, effectively avoid the cracked problem of junction atress, nevertheless thinner connection piece exists the problem that flow cross section is little, leads to the ability of overflowing to be difficult to satisfy the requirement that high magnification overflows. Some schemes enable the connecting sheet to have a larger overflowing section by thickening the thickness of the connecting sheet, so that the connecting sheet has higher overflowing capacity. In the process of connecting the connecting sheet and the battery cell and in the use process of the battery module, the connecting sheet usually can be subjected to force from the battery cell to deform to a certain extent, but the thickness of the connecting sheet is increased to increase the rigidity of the connecting sheet, so that the adaptability and deformability are poor, and therefore the connecting part of the connecting sheet and the battery cell pole column is easy to break due to too large stress, and the stability and the safety of the battery module are influenced.

To the above problem, the embodiment of the application provides a connection piece, can increase and overflow the cross-section and effectively reduce rigidity to improve the stability of ability and connection of overflowing.

Fig. 1 is a schematic structural diagram of a connecting sheet according to an embodiment of the present disclosure, fig. 2 is a schematic view of an a direction of the connecting sheet shown in fig. 1, and referring to fig. 1 and fig. 2, an embodiment of a first aspect of the present disclosure provides a connecting sheet 200 for connecting a terminal of a battery cell, the connecting sheet 200 includes a sheet-shaped first substrate 210 and a sheet-shaped second substrate 220, the first substrate 210 and the second substrate 220 are stacked and connected to each other to form a double-layer structure, where the first substrate 210 includes a first buffer portion 212 and first connection portions 211 located on both sides of the first buffer portion 212, and the second substrate 220 includes a second buffer portion 222 and second connection portions 221 located on both sides of the second buffer portion 222.

When the connecting sheet 200 is applied to connecting a battery cell, the first connecting portion 211 and the second connecting portion 221 can be used for connecting a pole of the battery cell, and the first buffering portion 212 and the second buffering portion 222 can be adaptively deformed when stressed, so that the stress of the connecting position of the pole is reduced, and the fracture of the connecting position can be effectively avoided. The first substrate 210 and the second substrate 220 are stacked to form a double-layer structure, and compared with a single-layer structure, the overcurrent cross section is increased, so that the overcurrent capacity is improved, and the requirement of high-rate overcurrent of the battery cell is met; compared with the scheme of increasing the flow cross section through thickening, under the condition that the flow cross section area is the same, the first base body 210 and the second base body 220 can respectively adopt a thinner structure, the rigidity is lower, the first base body and the second base body are respectively easier to deform under stress, and the rigidity of the first buffering part 212 and the rigidity of the second buffering part 222 are close to the rigidity of a single layer, so that the first buffering part and the second buffering part are easier to deform under stress compared with the thickening scheme, the stress can be better buffered, and the fracture of a connecting part caused by overlarge stress can be effectively avoided.

In some embodiments, the first buffer portion 212 and the second buffer portion 222 may adopt a convex structure, a concave structure, a wave-shaped structure, and the like, and during the use of the battery module, the connecting piece 200 is generally subjected to a force from the battery cell, for example, a force generated by expansion or contraction of the battery cell, and the first buffer portion 212 and the second buffer portion 222 can be adaptively deformed when the force is applied, so that the first connecting portion 211 and the second connecting portion 221 are prevented from being deformed by the force to affect the connection with the battery cell, and the connection stability of the connecting piece 200 and the battery cell is improved.

Referring to fig. 1 and 2, in some embodiments, the first buffering portion 212 includes a first overflowing section 213 and first bending sections 214 located at two sides of the first overflowing section 213, two sides of the first overflowing section 213 are connected to the first connecting portions 211 through the first bending sections 214, so that the first buffering portion 212 recessed relative to the first connecting portions 211 is formed, a space for deformation is formed between the two first connecting portions 211, the first buffering portion 212 can deform adaptively when a force is applied, and the first connecting portions 211 at two sides can approach or separate from each other to a certain extent, so as to prevent the connecting portion from being broken due to an excessive force applied. Similarly, the second buffer portion 222 includes a second overflowing section 223 and a second bending section 224 located on two sides of the second overflowing section 223, two sides of the second overflowing section 223 are respectively connected to the second connecting portion 221 through the second bending section 224, thereby forming the second buffer portion 222 recessed relative to the second connecting portion 221, thereby forming a space for deformation between the two second connecting portions 221, the second buffer portion 222 can be deformed adaptively during stress, thereby the second connecting portions 221 on two sides can be close to or far away from each other to a certain extent, so that the fracture occurs due to too large stress at the connecting portion, and connection failure is caused.

Fig. 3 is a schematic view of a connecting sheet shown in fig. 1 from a direction B, fig. 4 is a schematic view of a part enlarged from a position C in fig. 3, and referring to fig. 1 to fig. 4, in some embodiments, the first substrate 210 and the second substrate 220 are formed by folding the same metal sheet along a set folding line, and the folded first substrate 210 and the second substrate 220 can be formed by folding, a joint portion 230 is formed at the position of the folding line, and the first substrate 210 and the second substrate 220 are connected to each other through the joint portion 230, which is simple and efficient in processing and has a stable structure. Of course, the first substrate 210 and the second substrate 220 may also be made of two independent metal sheets, and after the first substrate 210 and the second substrate 220 are laminated, they may be connected by a conventional connection means such as welding, and the specific processing manner may be selected according to the actual processing requirement.

Referring to fig. 1 and 2, in some embodiments, the second buffer portion 222 is aligned with the first buffer portion 212, so as to facilitate the overall process, for example, a metal sheet may be folded to form the first and second laminated

substrates

210 and 220 in the manner described above, or two separate metal sheets may be stacked and then connected to each other to form the first and second laminated

substrates

210 and 220, and then the first and second laminated

substrates

210 and 220 are simultaneously stamped by a stamping process to form the first folding section 214 and the first flow-passing section 213 of the first buffer portion 212, and the second folding section 224 and the second flow-passing section 223 of the second buffer portion 222, so that the connector is formed by one-step stamping, and the process is simple and efficient, and the first and

second buffer portions

212 and 222 are highly aligned and abut against each other, so that the overall structure of the connector is compact.

Of course, the first base 210 and the second base 220 may be separately processed, for example, the first flow passage section 213 and the first bending section 214 of the first buffer portion 212 may be processed in a predetermined region on the same metal sheet to form the first base 210, the second flow passage section 223 and the second bending section 224 of the second buffer portion 222 may be processed in another region to form the second base 220, and then the first base 210 and the second base 220 may be folded to form a double-layer structure. The first base 210 and the second base 220, which are made of separate metal sheets, may be formed by separately processing the first buffer portion 212 and the second buffer portion 222, and then laminating and connecting the first base 210 and the second base 220.

In some embodiments, the first buffer portion 212 and the second buffer portion 222 may also be in a non-aligned structure (not shown) and are staggered from each other, in which the first bending section 214 on the first base 210 and the second bending section 224 on the second base 220 are in opposite directions, so that the first buffer portion 212 is recessed with respect to the first connection portion 211 and the second buffer portion 222 is recessed with respect to the second connection portion 221, thereby avoiding the first buffer portion 212 and the second buffer portion 222 from being structurally interfered when the first base 210 and the second base 220 are stacked. In the processing, the first buffer portion 212 and the second buffer portion 222 are processed on the first substrate 210 and the second substrate 220, respectively, and then stacked to form a double-layer structure.

Referring to fig. 1 and 2, in some embodiments, the first connection portion 211 and the second connection portion 221 are sheet-shaped structures, and can provide a larger contact area for the terminal, so as to reduce impedance, help to improve the safety of the battery module, and reduce the occupied space. The two first connection portions 211 and the two second connection portions 221 may be located in the same plane, so as to be suitable for connecting the cells with the terminals located in the same plane. Use second connecting portion 221 as an example, adopt the battery module that the coplanar was arranged to a plurality of electric cores, connection piece 200 pastes the utmost point post of pasting adjacent electric core through the second connecting portion 221 that is located the coplanar to with utmost point post and first connecting portion 211, second connecting portion 221 electricity is connected, thereby realize establishing ties or parallelly connected of electric core, to the battery module of the different planar layout of a plurality of electric cores, two second connecting portions 221 also can the adaptability configure to the setting of different planes, so that connect the utmost point post of adjacent electric core.

Referring to fig. 1 and 2, in some embodiments, the first overcurrent section 213 and the second overcurrent section 223 have a sheet structure, so that a large heat dissipation area is provided, heat can be effectively dissipated, and the first overcurrent section 213 and the second overcurrent section 223 are prevented from being overheated to affect the safety of the battery module.

Fig. 5 is a structural view of another angle of the connecting sheet according to an embodiment of the present invention, and referring to fig. 1 and 5, in the connecting sheet 200 according to some embodiments, each first connecting portion 211 is provided with a first through hole 215 penetrating in a thickness direction of the first base 210, each second connecting portion 221 is provided with a second through hole 225 penetrating in a thickness direction of the second base 220, and the first through hole 215 is aligned with the second through hole 225. The first through hole 215 and the second through hole 225 are used for being connected with a pole on the battery cell in a positioning manner, so that the battery cell is electrically connected with the connecting sheet 200.

Referring to fig. 1, in the connecting sheet 200 of some embodiments, each first connecting portion 211 is further provided with a positioning groove 216, the positioning groove 216 is formed by a surface of the first connecting portion 211 that is away from the second connecting portion 221 in a concave manner, the first through hole 215 is communicated with the positioning groove 216, and the positioning groove 216 can be used for positioning the first connecting portion 211 and the second connecting portion 221 when the connecting sheet 200 is connected with a battery cell post, so as to prevent the position deviation from affecting the connection stability.

Therefore, the connection piece 200 of this application embodiment adopts bilayer structure to improve the ability of overflowing to have suitable flexibility, thereby guarantee the stability of connecting, when being applied to in the battery module, can help improving the stability and the security of battery module.

Fig. 6 is a schematic view of a partial structure of a battery module according to an embodiment of the present application, fig. 7 is a top view of fig. 6, and referring to fig. 6 and fig. 7, an embodiment of a second aspect of the present application provides a battery module, which includes a plurality of battery cells 100 and the connecting sheet 200 according to the first aspect of the present application, wherein the plurality of battery cells 100 are arranged along a set direction, and adjacent battery cells 100 are connected in series or in parallel through the connecting sheet 200 to meet different voltage and capacity requirements. This connection piece 200 can avoid increasing rigidity when improving the current capacity to improve the stability that connection piece 200 is connected with the utmost point post 101 of electric core 100, guarantee the stability and the security of battery module. Fig. 6 and 7 show how a plurality of battery cells 100 are stacked and arranged in the left-right direction, where the number of battery cells 100 is only used for illustration, and does not represent the actual number of battery cells 100 in the battery module. The pole 101 of the adjacent battery cell 100 is electrically connected through the connecting sheet 200 of the above first aspect embodiment, the first connecting portion 211 and the second connecting portion 221 of the connecting sheet 200 are respectively connected to the pole 101 of the two adjacent battery cells 100, and the first buffer portion 212 and the second buffer portion 222 are located between the two adjacent battery cells 100, as can be seen from the above embodiments, the connecting sheet 200 has strong overcurrent capacity, so that the overcurrent requirement of the high rate of the battery cells 100 can be met, on this basis, the connecting sheet 200 also has suitable flexibility, so that when the acting force of expansion or contraction of the battery cells 100 is received, the deformation can be adaptively performed, so that the acting force is buffered, and the connection failure with the pole 101 is avoided.

A third embodiment of the present application provides a battery pack (not shown) including a case and the battery module of the second embodiment, wherein the case has a receiving cavity; the battery module is accommodated in the accommodating cavity. The battery pack can be applied to a power battery system of a new energy automobile, wherein the battery module is connected in series and/or in parallel through the connecting sheet 200, and the connecting sheet 200 can avoid rigidity increase while improving overcurrent capacity, so that the stability of connection between the connecting sheet 200 and a battery cell pole is improved, and the stability and the safety of the battery pack are ensured.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. The connecting piece is characterized by comprising a first flaky base body and a second flaky base body, wherein the first base body and the second base body are stacked and connected with each other, and the first base body and the second base body are connected with each other:

the first base body comprises a first buffer part and first connecting parts positioned on two sides of the first buffer part;

the second base body comprises a second buffer part and second connecting parts positioned on two sides of the second buffer part;

the first connecting portion and the second connecting portion are used for being connected with a pole of the battery cell.

2. The tab according to claim 1, wherein the first substrate and the second substrate are formed from the same metal sheet by folding along a set fold line, the position of the fold line forming a joint, the first substrate and the second substrate being connected by the joint.

3. The connecting sheet according to claim 1, wherein the first buffer portion comprises a first overflowing section and first bending sections located at two sides of the first overflowing section, and two sides of the first overflowing section are respectively connected to the first connecting portion through the first bending sections; the second buffer part comprises a second overflowing section and second bending sections located on two sides of the second overflowing section, and two sides of the second overflowing section are connected to the second connecting part through the second bending sections respectively.

4. A web according to claim 3, wherein the second buffer is positioned in register with the first buffer.

5. The strap of claim 3, wherein the first flow passage section and the second flow passage section are tab structures.

6. The web of claim 1, wherein the first and second connection portions are sheet-like structures.

7. The connecting tab according to any one of claims 1 to 6, wherein each of the first connecting portions is provided with a first through hole penetrating in a thickness direction of the first base, and each of the second connecting portions is provided with a second through hole penetrating in a thickness direction of the second base, the first through holes being aligned with the second through holes.

8. The connecting sheet of claim 7, wherein each of the first connecting portions is further provided with a positioning groove formed by recessing a surface of the first connecting portion away from the second connecting portion, and the first through hole communicates with the positioning groove.

9. Battery module, its characterized in that includes:

a connector piece according to any one of claims 1 to 8;

and the battery cells are arranged along a set direction, and the adjacent pole columns of the battery cells are connected in series or in parallel through the connecting pieces.

10. A battery pack, comprising:

a case having a receiving cavity;

the battery module according to claim 9, wherein the battery module is received in the receiving cavity.