CN210744068U - Connecting assembly, battery module, battery pack and device - Google Patents

Abstract

The application relates to energy storage device technical field especially relates to a device, group battery, battery module and coupling assembling, coupling assembling includes: a circuit board; connecting sheets; an insulating film connected to the plurality of connection pads; wherein the insulating film is provided with a weak portion. In this application, the insulating film is provided with weak part, compares with the position that does not set up weak part, and the intensity of this weak part is lower, during the atress, takes place to warp and/or destroy in the position of this weak part to it takes place torn risk to reduce the insulating film other positions, improves coupling assembling's flexibility, and reduces because the tearing risk that leads to of connection piece that the insulating film tears, thereby reduces the risk of connection piece and other conductive parts short circuit, improves battery module's security performance.

Description

Connecting assembly, battery module, battery pack and device

Technical Field

The application relates to the technical field of energy storage devices, and relates to a connecting assembly, a battery module, a battery pack and a device.

Background

The battery module comprises a single battery and a connecting assembly, wherein the connecting assembly comprises a circuit board and a connecting sheet, the connecting sheet is connected with a single electrode lead of the battery, the circuit board is connected with the connecting sheet and used for collecting the temperature and voltage signals of the single battery, and meanwhile, the connecting sheet is bonded through a hot pressing film so that the connecting sheets form an integral structure and are convenient to assemble.

However, in the working process of the battery module, the battery monomer has expansive force, and under the action of the expansive force of the battery monomer, the hot-pressing film has the risk of being torn, so that the connecting sheet leaks outwards, and the short circuit risk exists.

SUMMERY OF THE UTILITY MODEL

The application provides a coupling assembling, battery module, group battery and device, the difficult outer hourglass of connection piece among this coupling assembling to reduce the risk of coupling assembling and battery module short circuit.

A first aspect of the present application provides a connection assembly, comprising:

a circuit board;

the connecting sheet is connected with the circuit board;

the insulating film is connected with the circuit board and the connecting sheet;

wherein the insulating film is provided with a weak portion, the insulating film is provided with a through hole and/or a groove, and the through hole and/or the groove are/is the weak portion.

In one possible design, the weakened portion includes a first body portion and a first arcuate portion;

the first arc-shaped part is connected to an end of the first body part along the extending direction of the first body part.

In one possible design, the first arcuate portion has an arc length greater than a width dimension of the first body portion end.

In one possible design, the cross section of the first body part is rectangular, the first arc-shaped part is in an arc structure, and the first arc-shaped part is tangent to two side walls of the first body part;

the diameter D of the first arc-shaped portion is equal to the width dimension a of the first body portion.

In one possible design, the first arc-shaped portion is a circular structure having an opening, and the first arc-shaped portion communicates with the first body portion through the opening;

the diameter D of the first arc-shaped portion is greater than the width dimension a of the first body portion.

In one possible design, the first body portion has a rectangular cross-section;

the first arc-shaped part comprises a first section, a second section and a third section, the third section is positioned between the first section and the second section, and the first section, the third section and the second section are in smooth transition;

the first section and the second section are both arc-shaped structures, the first section and the second section are tangent to two side walls of the first body part respectively, and at least part of the third section is of a curve-shaped structure.

In one possible design, the insulating film includes a first insulating film and a second insulating film;

at least a part of the circuit board and the connection tab is located between the first insulating film and the second insulating film along a height direction of the connection assembly, at least one of the first insulating film and the second insulating film being provided with the weak portion.

In one possible embodiment, the weakened portion is located between adjacent connection tabs and/or between a connection tab and the circuit board.

In one possible design, the dimension of the weak portion in the length direction of the connecting assembly is smaller than the dimension thereof in the width direction.

A second aspect of the present application provides a battery module including:

a battery cell including an electrode lead;

the connecting component is the connecting component;

the connecting piece is used for connecting the electrode lead of the battery cell.

The third aspect of the present application provides a battery pack, the battery pack includes a case and the battery module described above, the battery module is fixed in the case.

A fourth aspect of the present application provides an apparatus using a battery cell as a power source, the apparatus comprising:

a power source for providing a driving force to the device; and the combination of (a) and (b),

a battery module as described above configured to provide electrical energy to the power source.

In this application, the insulating film is provided with weak part, compares with the position that does not set up weak part, and the intensity of this weak part is lower, during the atress, takes place to warp and/or destroy in the position of this weak part to it takes place torn risk to reduce the insulating film other positions, improves coupling assembling's flexibility, and reduces because the tearing risk that leads to of connecting piece that the insulating film tears, thereby reduces the risk of connecting piece and other conductive parts short circuit, improves battery module's insulating properties.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is an exploded view of a battery module provided as described herein in one embodiment;

FIG. 2 is a schematic illustration of the coupling assembly of FIG. 1 in one embodiment;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a schematic structural view of the first insulating film of FIG. 3;

FIG. 5 is an enlarged fragmentary view of portion I of FIG. 4, wherein the weakened portion is in accordance with the first embodiment;

FIG. 6 is an enlarged fragmentary view of portion I of FIG. 4, with the weakened portion being a second embodiment;

FIG. 7 is an enlarged fragmentary view of section II of FIG. 4, with the weakened portion being a third embodiment;

FIG. 8 is a schematic view of the structure of the second insulating film in FIG. 3;

FIG. 9 is an enlarged fragmentary view of section III of FIG. 8, with the weakened portion being a fourth embodiment;

FIG. 10 is an enlarged fragmentary view of section III of FIG. 8 with a fifth embodiment of the frangible portion;

fig. 11 is a schematic structural view of a weak portion in the sixth embodiment;

fig. 12 is a schematic structural view of a weak portion in the seventh embodiment;

FIG. 13 is a top view of FIG. 2;

FIG. 14 is a sectional view taken along line A-A of FIG. 13;

FIG. 15 is an enlarged view of a portion IV of FIG. 13;

FIG. 16 is a sectional view taken along line B-B of FIG. 15;

FIG. 17 is a bottom view of FIG. 2;

FIG. 18 is an enlarged view of a portion V of FIG. 17;

FIG. 19 is a top view of the alternative embodiment of FIG. 2;

FIG. 20 is a cross-sectional view taken along line C-C of FIG. 19;

fig. 21 is a schematic structural diagram of a battery pack provided in the present application in an embodiment.

Reference numerals:

a-a battery module;

b, a box body;

b1-upper box body;

b2-lower box;

b3-containing cavity;

1-a connecting assembly;

11-an insulating film;

111-a first insulating film;

111 a-a first via;

112-a second insulating film;

112 a-a second via;

12-a weakening;

121-a through hole;

121 a-a first body portion;

121 b-a first arc;

121c — a first arcuate wall;

121 g-opening;

121 h-first section;

121 k-second segment;

121 m-a third section;

121A-first via;

121B-a second via;

122-a groove;

122 a-a second body portion;

122 b-a second arc;

122 c-a second arcuate wall;

122 d-bottom wall;

122A-first groove;

122B-a second groove;

13-connecting piece;

131-a connecting portion;

14-a circuit board;

141-connector;

2-a battery cell;

21-electrode lead;

3-an end plate;

5-a first tie;

6-second band.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, including two, unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The embodiment of the application provides a device using a single battery 2 as a power supply, a battery pack, a battery module A and a connecting assembly 1, wherein the device using the single battery 2 as the power supply comprises a vehicle, a ship, a small airplane and other mobile equipment, the device comprises a power source, the power source is used for providing driving force for the device, and the power source can be configured as the battery module A for providing electric energy for the device. The driving force of the device may be electric energy, and may also include electric energy and other energy sources (e.g., mechanical energy), the power source may be battery module a (or battery pack), and the power source may also be battery module a (or battery pack), engine, and the like. Therefore, any device capable of using the battery cell 2 as a power source is within the scope of the present application.

Taking a vehicle as an example, the vehicle in the embodiment of the present application may be a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, and may also be a hybrid electric vehicle or a range-extended vehicle, etc. The vehicle can comprise a battery pack and a vehicle body, wherein the battery pack is arranged on the vehicle body, the vehicle body is also provided with a driving motor, the driving motor is electrically connected with the battery pack and provides electric energy, and the driving motor is connected with wheels on the vehicle body through a transmission mechanism so as to drive the vehicle to move. Specifically, the battery pack may be horizontally disposed at the bottom of the vehicle body.

As shown in fig. 21, the battery pack includes a case B and the battery module a of the present application, wherein the case B has a receiving cavity B3, the battery module a is received in the receiving cavity B3, the number of the battery modules a may be one or more, and a plurality of the battery modules a are arranged in the receiving cavity B3. The type of the box body B is not limited, and may be a frame-shaped box body, a disc-shaped box body, a box-shaped box body or the like. Specifically, as shown in fig. 21, the case B may include a lower case B2 accommodating the battery module a and an upper case B1 covering the lower case B2.

More specifically, as shown in fig. 1, the battery module a includes a plurality of battery cells 2 and a frame structure for fixing the battery cells 2, wherein the plurality of battery cells 2 are stacked one on another in the length direction X. The frame structure comprises end plates 3, wherein the end plates 3 are positioned at two ends of the single battery 2 along the length direction X and are used for limiting the movement of the single battery 2 along the length direction X, and meanwhile, in a specific embodiment, the frame structure further comprises side plates (not shown in the figure), the two side plates are positioned at two sides of the single battery 2 along the width direction Y, and the side plates are connected with the end plates 3, so that the frame structure is formed; in another preferred embodiment, the frame structure may be provided without side plates, and the end plates 3 and the straps form the frame structure described above, after the battery cells 2 have been stacked, either by means of the first straps 5 or by means of the first straps 5 and the second straps 6.

Specifically, the battery cells 2 include electrode leads 21, and each battery cell 2 includes a positive electrode lead and a negative electrode lead, in the battery module a, a plurality of battery cells 2 are electrically connected, specifically, a series connection and/or a parallel connection may be adopted, and the battery cells 2 are connected by the connecting sheet 13, for example, when the battery cells 2 are connected in series, the positive electrode lead of one battery cell 2 and the negative electrode lead of another battery cell 2 are connected by the connecting sheet 13.

As shown in fig. 1, the battery module a further includes a connecting member 1, the connecting member 1 being disposed near one end of the electrode lead 21 of the battery cell 2, and in the embodiment shown in fig. 1, the connecting member 1 being located above the battery cell 2.

In a particular embodiment, as shown in fig. 2 and 3, the connection assembly 1 comprises: the connecting component comprises a circuit board 14 and connecting pieces 13, wherein the circuit board 14 is used for collecting signals such as temperature and voltage in the working process of the battery monomer 2, the collected signals are output through a connector 141, the connecting pieces 13 are used for connecting electrode leads 21 of the battery monomer 2, as shown in fig. 3, the connecting component 1 comprises a plurality of connecting pieces 13, and the arrangement position of each connecting piece 13 changes along with the position and the connection mode of the battery monomer 2. The circuit board 14 is electrically connected to the connecting sheet 13, so that the information of the battery cell 2 can be collected through the connecting sheet 13. The specific circuit board 14 may be an FPC, a PCB, or the like, and is not particularly limited as long as the information of the battery cell 2 can be collected.

Meanwhile, in the present embodiment, as shown in fig. 3, the connecting assembly 1 further includes an insulating film 11, the insulating film 11 is connected to both the circuit board 14 and the connecting sheets 13, so that the circuit board 14 and the connecting sheets 13 are connected into a whole through the insulating film 11, and at the same time, the insulating film 11 also plays a role of insulation, so as to prevent short circuit of each electrical component.

In another embodiment, the connection module 1 includes a plurality of connection tabs 13, the connection tabs 13 being used to connect electrode leads 21 of the battery cells 2, thereby achieving electrical connection of the respective battery cells 2, and the connection module 1 further includes an insulating film 11, the insulating film 11 being connected to the respective connection tabs 13, the insulating film 11 also serving as an insulator, thereby preventing short circuits between the connection tabs 13. Specifically, as described above, in the connection assembly 1, each connection sheet 13 is connected to each corresponding battery cell 2, because the battery cell 2 expands during operation, under the action of the expansion force, the battery cell 2 displaces, and the connection sheet 13 connected to the battery cell 2 is driven to displace, so that the insulation film 11 of the connection assembly 1 is pulled, and the insulation film 11 is torn.

In order to solve the technical problem, in the present application, the insulating film 11 is provided with the weak portion 12, and compared with the position where the weak portion 12 is not provided, the weak portion 12 has lower strength, and when a force is applied, the position of the weak portion 12 is deformed and/or damaged, so that the risk of tearing at other positions of the insulating film 11 is reduced, the flexibility of the connecting assembly 1 is improved, the risk of exposing the connecting sheet 13 due to tearing of the insulating film 11 is reduced, the risk of short circuit between the connecting sheet 13 and other conductive components is reduced, and the safety performance of the connecting assembly 1 and the battery module a is improved.

Meanwhile, when the connecting assembly 1 includes the circuit board 14 and the plurality of connecting pieces 13, the weak portion 12 is located between the adjacent connecting pieces 13, and/or the weak portion 12 is located between the connecting pieces 13 and the circuit board 14, so that when the weak portion 12 is broken by an expansion force, its broken portion is located between the adjacent connecting pieces 13, and/or the broken portion is located between the connecting pieces 13 and the circuit board 14, the risk of the connecting pieces 13 and/or the circuit board 14 being exposed is low, thereby further improving the insulating property of the connecting assembly 1 from the battery module a.

When the connecting assembly 1 includes a plurality of connecting tabs 13, the weak portion 12 is located between adjacent connecting tabs 13, so that when the weak portion 12 is ruptured by an expansion force, the ruptured portion thereof is located between adjacent connecting tabs 13, and the risk of exposure of the connecting tabs 13 is low, thereby further improving the insulating property of the connecting assembly 1 from the battery module a.

Specifically, as shown in fig. 4 and 5, the dimension of the weak portion 12 in the length direction X of the connection assembly 1 is smaller than the dimension thereof in the width direction Y, and the weak portion 12 is easily deformed in the length direction X when subjected to an expansion force due to the expansion force of the battery cells 2 in the length direction X (stacking direction of the battery cells 2), thereby further improving the strength of the insulating film 11 in which the weak portion 12 is not provided.

In one possible design, as shown in fig. 3, the insulating film 11 is provided with a through hole 121 and/or a groove 122, the through hole 121 and/or the groove 122 being the above-described weak portion 12.

In this embodiment, the through hole 121 has the advantage of simple structure, and the insulating film 11 with smaller thickness has lower processing difficulty when the through hole 121 is arranged; the groove 122 has a bottom wall, and the thickness of the bottom wall of the groove 122 is small, and deformation and/or damage easily occur at the position where the thickness is small, that is, the insulating film 11 is still integral after the groove 122 is formed, so that the insulating performance of the connecting assembly 1 can be further improved.

In the embodiment shown in fig. 3, the insulating film 11 includes a first insulating film 111 and a second insulating film 112, and the first insulating film 111 and the second insulating film 112 are disposed along the height direction Z of the battery module a and are integrally connected, specifically, by hot pressing. Meanwhile, at least part of the circuit board 14 and the connecting sheets 13 is located between the first insulating film 111 and the second insulating film 112, after the two insulating films are connected, each connecting sheet 13 and the circuit board 14 are connected into a module, and the two insulating films can also realize insulation between the circuit board 14 and the single battery 2, so that the connecting assembly 1 can play an insulating role, can also play a role in connecting the single battery 2, and can also play a role in collecting information in the working process of the single battery 2.

In another embodiment, in the connection module 1, at least a portion of the connection pads 13 is located between the first insulating film 111 and the second insulating film 112, and after the two insulating films are connected to the connection pads 13, so that the connection pads 13 are connected into a module, the two insulating films can also realize insulation between the connection pads 13. Specifically, at least one of the first insulating film 111 and the second insulating film 112 is provided with the above-described weak portion 12, and therefore, the first insulating film 111 can be deformed and/or broken at the weak portion 12 thereof by an expansion force, thereby improving the flexibility of the first insulating film 111; under the effect of the expansion force, the second insulating film 112 can be deformed and/or broken at the weak portion 12 thereof, thereby improving the flexibility of the second insulating film 112.

In one possible design, as shown in fig. 4, the weak portion 12 of the first insulating film 111 is provided as a first through-hole 121A or a first groove 122A; alternatively, as shown in fig. 8, the weak portion 12 of the second insulating film 112 is provided as the second through hole 121B or the second groove 122B. As shown in fig. 5, the first through hole 121A (or the second through hole 121B) includes a first body portion 121A and a first arc-shaped portion 121B, and along the extending direction of the first body portion 121A, the end portion of the first body portion 121A is connected to the first arc-shaped portion 121B; as shown in fig. 6, the first groove 122A (or the second groove 122B) includes a second body portion 122A and a second arc portion 122B, and the second arc portion 122B is connected to an end portion of the second body portion 122A along an extending direction of the second body portion 122B.

It should be noted that, taking the first through hole 121A (or the second through hole 121B) as an example, the extending direction of the first body portion 121A refers to: the first body portion 121a may be a structure extending in one direction (for example, the first body portion 121a extends in the width direction Y of the connection assembly 1) as shown in fig. 5, 6, 9 and 10, or a structure extending in multiple directions as shown in fig. 7, 11 and 12, that is, the first body portion 121a is a bent structure (for example, a part of the first body portion 121a extends in the length direction X of the connection assembly 1, and another part extends in the width direction Y of the connection assembly 1). Therefore, regardless of the structure of the first body part 121a, both ends thereof are provided with the first arc parts 121 b.

In this embodiment, when the connecting component 1 is subjected to an expansion force, the insulating film deforms and/or cracks at the position of the weak portion 12, and the arc-shaped side wall of the first arc-shaped portion 121b can reduce the stress concentration of the weak portion 12, and reduce the risk that the two insulating films are continuously torn under the action of the expansion force, thereby improving the strength of the insulating films.

In one possible design, the arc length of the first arc-shaped portion 121b is greater than the width dimension of the end portion of the first body portion 121a, wherein the end portion of the first body portion 121a is the portion of the first body portion 121a connected with the first arc-shaped portion 121b, i.e., the arc length of the first arc-shaped portion 121b is greater than the width dimension of the end portion of the first body portion 121a connected with the first arc-shaped portion 121 b.

For example, the width dimension a of the end of the first body part 121a is less than 0.3mm, and the width of the first body part 121a can also reduce the risk of welding slag falling into the battery module a from the weak part 12. Preferably, the width a of the end of the first body portion 121a is less than or equal to 0.2 mm; further preferably, the width a of the end of the first body portion 121a is less than or equal to 0.1 mm. Both ends of the first body portion 121a along the extending direction thereof have first arc-shaped walls 121c, and the first arc-shaped walls 121c are the first arc-shaped portions 121 b.

When the width of each position of the first body portion 121a is the same (for example, the cross section of the first body portion 121a is rectangular), the arc length of the first arc-shaped portion 121b is greater than the width dimension a of the first body portion 121 a.

Specifically, as in the embodiment shown in fig. 5 and 7, the weak portion 12 of the first insulating film 111 is provided as a first through-hole 121A, the first through-hole 121A includes a first body portion 121A and a first arc-shaped portion 121b, the first arc-shaped portion 121b is a circular structure having an opening 121g, and the first arc-shaped portion 121b communicates with the first body portion 121A through the opening 121g, both of which form the first through-hole 121A described above. The first body portion 121a may be a structure extending along one direction, or a structure extending along multiple directions (a bent structure), and the diameter D of the first arc-shaped portion 121b is greater than the width a of the first body portion 121 a. When the diameter D of the circular arc-shaped first arc-shaped portion 121b is larger than the width of the first body portion 121a, the stress concentration of the weak portion 12 at the first arc-shaped portion 121b can be further reduced.

More specifically, the first body portion 121a has a rectangular cross section, and the width dimension a of the first body portion 121a is less than 0.3mm, and the diameter D of the first arc-shaped portion 121b is less than 0.5 mm. In this embodiment, the width of the first body portion 121a is smaller, and the diameter of the first arc-shaped portion 121b is slightly larger than the width of the first body portion 121a, so that when the weak portion 12 is a through hole or a groove, the risk that welding slag falls into the battery module a from the first body portion 121a can be reduced. In this embodiment, the first arc-shaped portion 121b of the arc structure has the advantage of being convenient to form, and each position of the first arc-shaped portion is uniformly stressed, so that the risk of stress concentration can be further reduced. Meanwhile, the first arc-shaped part 121b with a larger diameter can further reduce the risk of tearing after being stressed. Of course, the first arc-shaped portion 121b may have a circular structure as shown in fig. 5 to 7, but does not necessarily have to have a circular structure as long as it has an arc-shaped structure.

In another possible design, as shown in fig. 9 and 11, the weak portion 12 of the second insulating film 112 is provided as a second through hole 121B, the second through hole 121B includes a first body portion 121a and a first arc-shaped portion 121B, the weak portion 12 may be a long hole, specifically, the first body portion 121a has a rectangular cross section, the first arc-shaped portion 121B has an arc structure, and the first arc-shaped portion 121B is tangent to two sidewalls of the first body portion 121a, when the diameter D of the first arc-shaped portion 121B is equal to the width dimension a of the first body portion 121 a. In this embodiment, when the weak portion 12 is a rectangular hole, the weak portion has the advantages of simple structure and convenience in forming, and the diameter D of the first arc-shaped portion 121b is smaller, so that the risk that the welding slag falls into the connecting assembly 1 through the first arc-shaped portion 121b can be reduced.

The first body portion 121a may be a structure extending along one direction, as shown in fig. 9, or a structure extending along multiple directions (a bent structure), as shown in fig. 11, and the end portion of the first body portion 121a is provided with the first arc-shaped portion 121b no matter how the first body portion 121a extends.

In yet another possible design, as shown in fig. 12, the first body portion 121a has a rectangular cross section, and the first body portion 121a may have a structure extending in one direction or a structure extending in multiple directions (a bent structure). The first arc-shaped portion 121b includes a first segment 121h, a second segment 121k, and a third segment 121m, wherein the third segment 121m is located between the first segment 121h and the second segment 121k, and the first segment 121h, the third segment 121m, and the second segment 121k are in smooth transition; the first segment 121h and the second segment 121k are both arc-shaped structures, the first segment 121h and the second segment 121k are respectively tangent to two side walls of the first body portion 121a, and the third segment 121m is a curved structure, or the third segment 121m is a combination of an arc-shaped structure and a linear structure.

In this embodiment, the first arc-shaped portion 121b may include one or more third segments 121m, and each third segment 121m is located between the first segment 121k and the second segment 121h and has a smooth transition, so that the first arc-shaped portion 121b may have an irregular arc-shaped structure or a regular arc-shaped structure, for example, the first arc-shaped portion 121b may have a partially elliptical structure.

Specifically, as shown in fig. 12, the first arc-shaped portion 121b has a cross-sectional dimension larger than the width dimension a of the first body portion 121a, and at this time, the first arc-shaped portion 121b can reduce the stress concentration of the weak portion 12 at that position. The width dimension a of the first body part 121a is less than 0.3mm, and the smaller first body part 121a can reduce the risk of welding slag falling into the battery module a from the weak part 12.

In order to further improve the reliability of the connection component 1, when the first insulating film 111 and the second insulating film 112 are each provided with the weak portion 12, the weak portion 12 located at the first insulating film 111 is provided corresponding to the weak portion 12 located at the second insulating film 112 in the height direction Z of the connection component 1. Here, "corresponding setting" herein means: the weak portion 12 located at the second insulating film 112 is disposed adjacent to the weak portion 12 located at the first insulating film 111. In this embodiment, when the weak portions 12 of the two insulating films approach each other, the positions of deformation and/or fracture of the two insulating films are the same or close to each other under the action of the expansive force, so that the two insulating films can be deformed and/or fractured simultaneously, and the deformation consistency of the connection assembly 1 under the action of the expansive force can be improved.

In one possible design, the projection of the weak portion 12 of the first insulating film 111 in the height direction Z coincides with at least part of the projection of the weak portion 12 of the second insulating film 112 in the height direction Z, and the deformation and/or fracture of the two insulating films are closer to each other under the expansion force, thereby further improving the deformation consistency of the connection component 1.

Wherein, the projection of the two weak portions 12 along the height direction Z at least partially overlapping respectively located on the first insulating film 111 and the second insulating film 112 means: the projection of one weak portion 12 is located within the projection of the other weak portion 12 in the height direction Z, and at this time, the projection overlapping area of the two weak portions 12 is large, so that the uniformity of deformation of the two insulating films can be further improved; or, the projection parts of the two weak parts 12 are overlapped, and the other part is not overlapped, and because the projection overlapping area of the two weak parts 12 is reduced, when the two weak parts 12 are both through holes, the risk that welding slag falls into the battery module a through the overlapping area of the projections of the two weak parts 12 can be reduced.

Preferably, as shown in fig. 14, the center line O1 of the weak portion 12 of the first insulating film 111 coincides with the center line O2 of the weak portion 12 of the second insulating film 112. When the central lines of the two weak portions 12 coincide, it can be ensured that the projection portions of the two weak portions 12 coincide, and the area of the coincidence of the projection portions of the two weak portions is large, that is, the projection of the weak portion 12 with a small area is entirely located in the projection range of the weak portion 12 with a large area, so that the flexibility of the connecting assembly 1 is high.

In another possible design, the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 are disposed in a staggered manner, and the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 have a predetermined distance therebetween, and the minimum distance therebetween is t, 0 < t ≦ 0.5 mm. In the embodiment shown in fig. 20, the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 have a predetermined distance in the longitudinal direction X of the connection component 1, and the distance between the edge of the weak portion 12 of the first insulating film 111 and the edge of the weak portion 12 of the second insulating film 112 adjacent thereto is at least t, 0 < t ≦ 0.5 mm.

In the present embodiment, the distance between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 is small, that is, they are close to each other, and therefore, the deformation consistency of the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 is still high by the expansion force, so that the flexibility of the connection component 1 is high. Meanwhile, when the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 are not communicated in the height direction Z, even though the welding slag can enter the connection assembly 1 through the weak portion 12 of the first insulating film 111, the welding slag cannot enter the inside of the battery module a through the weak portion 12 of the second insulating film 112, that is, the welding slag can be effectively prevented from entering the battery module a.

Specifically, as shown in fig. 20, the first insulating film 111 overlaps the second insulating film 112 in the height direction Z, with the overlapping portion between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112.

In the present embodiment, the overlapping portion of the first insulating film 111 and the second insulating film 112 is located between the adjacent connecting pads 13 and between the weak portions 12 of the two insulating films 11, and the overlapping dimension of the two insulating films 11 in the length direction X is equal to the minimum distance t between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112, that is, the overlapping dimension of 0 < t ≦ 0.5mm, and for example, the overlapping dimension t may be specifically 0.4mm or the like.

In this embodiment, the first insulating film 111 and the second insulating film 112 are overlapped with each other to increase the connection area therebetween, thereby increasing the connection reliability therebetween, and at the same time, the two weak portions 12 can be brought close to each other by controlling the overlapping dimension t, thereby reducing the processing difficulty of the insulating film 11 and increasing the flexibility of the connecting assembly 1.

It should be noted that, when the overlapping dimension t of the two insulating films 11 is reduced, the first insulating film 111 and the second insulating film 112 are more easily deformed by the expansion force, thereby further improving the flexibility of the connection component 1; when the lap dimension t is increased, the difficulty of processing the first through hole 121A and the second through hole 121B at the time of molding the connection component 1 can be reduced, and the connection reliability of the first insulating film 111 and the second insulating film 112 can be improved. Therefore, in practical conditions, the overlapping dimension t of the first insulating film 111 and the second insulating film 112 can be set by taking the above two factors into consideration, and is not limited to t ≦ 0.5 mm.

In the above embodiments, the weak portion 12 of the first insulating film 111 may be provided as the first through hole 121A, and the weak portion 12 of the second insulating film 112 may be provided as the second through hole 121B, so that the two insulating films 11 are more easily deformed by the expansion force when both the weak portions 12 are through holes, thereby improving the flexibility of the connection component 1.

Specifically, the width a of the first through hole 121A is smaller than the width B of the second through hole 121B, and when the width a of the first through hole 121A is smaller, the risk that the welding slag enters the connecting assembly 1 through the first through hole 121A can be reduced.

When the first through hole 121A and the second through hole 121B are two through holes, the dimension in the direction with the larger dimension is defined as the length of the through hole, and the dimension in the direction with the smaller dimension is defined as the width of the through hole, that is, the length is greater than the width regardless of the shapes of the first through hole 121A and the second through hole 121B.

In this embodiment, since the two through holes have the largest dimension in the width direction Y, the dimension a of the first through hole 121A in the length direction X is the width dimension of the first through hole 121A, the dimension B of the second through hole 121B in the length direction X is the width dimension of the second through hole 121B, and the widths of the two through holes satisfy: the width of the first via hole 121A located in the first insulating film 111 is smaller than the width of the second via hole 121B located in the second insulating film 112.

In addition, along the extending direction of the first main body 121A (e.g., the width direction Y of the connecting assembly), the size of the second through hole 121B is L2, the size of the first through hole 121A is L1, and as described above, along the extending direction of the first main body 121A, the size L1 of the first through hole 121A is the length of the first through hole 121A, and the size L2 of the second through hole 121B is the length of the second through hole 121B, therefore, the relationship between the length L1 of the first through hole 121A and the length L2 of the second through hole 121B is: l1> L2. In this embodiment, the second through hole 121B having a smaller length can reduce the risk that impurities such as welding slag entering the connection assembly 1 through the first through hole 121A enter the battery module a through the second through hole 121B.

In one embodiment, the first via hole 121A of the first insulating film 111 may have a structure as shown in fig. 5, and the second via hole 121B of the second insulating film 112 may have a structure as shown in fig. 9. Specifically, as shown in fig. 5, the first through hole 121A includes a first body portion 121A, and along the extending direction of the first body portion 121A, an end portion of the first body portion 121A is provided with a first arc-shaped portion 121b, and the first arc-shaped portion 121b is a circular structure having an opening 121g, and the first arc-shaped portion 121b is communicated with the first body portion 121A through the opening 121 g; as shown in fig. 9, the second through hole 121B is a long hole.

Meanwhile, as shown in fig. 14, the center line O1 of the first through hole 121A coincides with the center line O2 of the second through hole 121B, that is, the first through hole 121A and the second through hole 121B penetrate in the height direction Z, and both the first insulating film 111 and the second insulating film 112 are deformable by the expansion force, so that the connecting component 1 is made highly flexible.

Specifically, L2 ≦ L1-2 × D, where as shown in fig. 14, the dimension D is the diameter of the first arc-shaped portion 121B in the first through hole 121A, L1 is the length dimension of the first through hole 121A, L2 is the length dimension of the second through hole 121B, and meanwhile, the center line O1 of the first through hole 121A coincides with the center line O1 of the second through hole 121B.

In this embodiment, as shown in fig. 5, when the first through hole 121A includes the first arc-shaped portion 121B with a larger diameter D, the risk of the welding slag entering the connection assembly 1 from the first arc-shaped portion 121B is higher, and in order to reduce the risk of the welding slag entering the battery module a through the first arc-shaped portion 121B, a through hole structure is not disposed at a position corresponding to the first arc-shaped portion 121B in the second insulating film 112, that is, the length L2 of the second through hole 121B and the length L1 of the first through hole 121A satisfy L2 ≤ L1-2 × D, so that the risk of the welding slag entering the inner cavity of the battery module a can be reduced after the welding slag enters the wire harness isolation assembly 1 through the first arc-shaped portion 121B.

In the above embodiments, in order to effectively prevent the metal particles from entering the cavity of the battery module a from the weak portion 12 while ensuring the release of the expansion force, the width a of the first body portion 121a is less than 0.3mm, preferably, a is less than or equal to 0.2 mm; more preferably, a is 0.1mm or less.

Of course, the via structure in each of the above embodiments may also be a groove structure, for example, the first insulating film 111 is provided with a first groove 122A, and the second insulating film 112 is provided with a second groove 122B, wherein the first groove 122A and the second groove 122B may have the same shape or different shapes. Alternatively, one of the first insulating film 111 and the second insulating film 112 may be provided as the through hole 121 and the other may be provided as the groove 122. The shape of the via hole 121 or the recess 122 of the first insulating film 111 and the shape of the via hole 121B or the recess 122B of the second insulating film 112 may be the same or different.

In the first embodiment, as shown in fig. 6, the first groove 122A and the second groove 122B each include a second body portion 122A, the second body portion 122A is a rectangular groove, and along the extending direction of the second body portion 122A, the two ends of the second body portion 122A are provided with second arc-shaped portions 122B, and the second arc-shaped portions 122B are in an arc-shaped groove-shaped structure (having a bottom wall 122 d). Specifically, the second arc-shaped portion 122b is specifically an arc-shaped groove. In another embodiment, as shown in fig. 10, the first groove 122A and the second groove 122B may be both of elongated groove structures, that is, the first groove 122A and the second groove 122B have second arc-shaped walls 122c on both sides along the width direction Y.

It can be understood that, as for the through hole 121 and the groove 122, the through hole 121 is more easily deformed when a force is applied, that is, the insulating film 11 is provided with the through hole 121, so that the strength of the connecting component 1 can be higher, and the through hole 121 also has an advantage of convenience in processing. On the other hand, the groove 122 has a bottom wall, and after the groove 122 is provided, the position still has an isolation effect, so that the risk that welding slag enters the inner cavity of the battery module a through the weak portion 12 can be reduced.

On the other hand, as shown in fig. 1 to 3, the second insulating film 112 is close to the battery cell 2, that is, when the connection assembly 1 is mounted in the battery module a, the second insulating film 112 is located below the first insulating film 111, the connecting sheet 13 is located between the first insulating film 111 and the second insulating film 112, and both the insulating films are connected (specifically, may be bonded) to the connecting sheet 13, thereby serving to fix the connecting sheet 13. Meanwhile, the connecting piece 13 includes a connecting portion 131, the connecting portion 131 corresponds to and is connected to the electrode lead 21, the first insulating film 111 has a first via hole 111a, the second insulating film 112 has a second via hole 112a, and the connecting portion 131 is located between the first via hole 111a and the second via hole 112a along the height direction Z. Therefore, in the battery module a, in the up-down direction, the following are performed in order: the first via hole 111a, the connection portion 131 of the connection piece 13, the second via hole 112a, and the electrode lead 21.

In this embodiment, when the connecting sheet 13 is connected (e.g., welded) to the corresponding electrode lead 21, the first via hole 111a and the second via hole 112a serve as avoiding holes for connecting the connecting sheet 13 to the corresponding electrode lead 21, which facilitates welding between the connecting portion 131 and the electrode lead 21, and can avoid the functional failure of the insulating film connecting sheet 13 caused by burning of the insulating film due to an excessively high welding temperature, thereby improving the reliability of the connecting assembly 1.

Therefore, in practical conditions, the weak portions 12 of the connecting assembly 1 can be arranged by taking the above factors into consideration, i.e. the weak portions 12 can be in the form of a part of the groove 122 and a part of the through hole 121.

In summary, in the present application, by providing the weak portion 12 on the insulating film 11, the weak portion 12 is deformed and/or broken under the action of the expansion force of the battery cell 2, so as to reduce the risk of breaking at the position where the weak portion 12 is not provided, reduce the risk of short circuit caused by the exposed connecting sheet 13, and improve the insulating property and the mechanical property of the connecting assembly 1 and the battery module a.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A connection assembly for a battery module, characterized in that the connection assembly (1) comprises:

a circuit board (14);

the connecting sheet (13), the connecting sheet (13) is connected with the circuit board (14);

an insulating film (11), the insulating film (11) being connected to the circuit board (14) and the connection pad (13);

wherein the insulating film (11) is provided with a weak portion (12), the insulating film (11) is provided with a through hole (121) and/or a groove (122), and the through hole (121) and/or the groove (122) is the weak portion (12).

2. The connection assembly according to claim 1, wherein the weak portion (12) comprises a first body portion (121a) and a first arc-shaped portion (121 b);

the first arc-shaped portion (121b) is connected to an end of the first body portion (121a) in an extending direction of the first body portion (121 a).

3. A connecting assembly according to claim 2, characterized in that the arc length of the first arc-shaped portion (121b) is greater than the width dimension of the end portion of the first body portion (121 a).

4. The connecting assembly according to claim 2, wherein the first body portion (121a) has a rectangular cross section, the first arc-shaped portion (121b) has an arc structure, and the first arc-shaped portion (121b) is tangential to two sidewalls of the first body portion (121 a);

the diameter D of the first arc-shaped part (121b) is equal to the width dimension a of the first body part (121 a).

5. The connecting assembly according to claim 2, wherein the first arc-shaped portion (121b) is a circular structure having an opening (121g), and the first arc-shaped portion (121b) communicates with the first body portion (121a) through the opening (121 g);

the diameter D of the first arc-shaped portion (121b) is larger than the width dimension a of the first body portion (121 a).

6. A connecting assembly according to claim 2, characterized in that said first body portion (121a) is rectangular in section;

the first arc-shaped part (121b) comprises a first section (121h), a second section (121k) and a third section (121m), the third section (121m) is positioned between the first section (121h) and the second section (121k), and the first section (121h), the third section (121m) and the second section (121k) are in smooth transition;

the first section (121h) and the second section (121k) are both arc-shaped structures, the first section (121h) and the second section (121k) are tangent to two side walls of the first body portion (121a), and at least part of the third section (121m) is a curved structure.

7. The connection assembly according to any one of claims 1 to 6, wherein the insulating film (11) includes a first insulating film (111) and a second insulating film (112);

at least a part of the circuit board (14) and the connection pad (13) is located between the first insulating film (111) and the second insulating film (112) in a height direction (Z) of the connection assembly (1), at least one of the first insulating film (111) and the second insulating film (112) being provided with the weak portion (12).

8. A connection assembly according to any one of claims 1 to 6, characterised in that the weakenings (12) are located between adjacent connection tabs (13) and/or in that the weakenings (12) are located between the connection tabs (13) and the circuit board (14).

9. A connection assembly according to any of claims 1-6, characterized in that the dimension of the weak portion (12) in the length direction (X) of the connection assembly (1) is smaller than its dimension in the width direction (Y).

10. A battery module (A), characterized in that the battery module (A) comprises:

a battery cell (2), the battery cell (2) comprising an electrode lead (21);

a connection assembly (1), the connection assembly (1) being a connection assembly (1) according to any one of claims 1 to 9;

the connecting piece (13) is used for connecting the electrode lead (21) of the battery cell (2).

11. A battery pack characterized in that the battery pack comprises a case (B) and the battery module (a) of claim 10, the battery module (a) being fixed in the case (B).

12. An apparatus using a battery cell as a power source, the apparatus comprising:

a power source for providing a driving force to the device; and the combination of (a) and (b),

the battery module (a) of claim 10 configured to provide electrical energy to the power source.

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