WO2021098464A1

WO2021098464A1 - Pouch battery module and packing method therefor, battery pack, and electric device

Info

Publication number: WO2021098464A1
Application number: PCT/CN2020/124540
Authority: WO
Inventors: 汪用广; 王鹏; 陈兴地; 唐彧; 游凯杰
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2019-11-19
Filing date: 2020-10-28
Publication date: 2021-05-27
Also published as: CN112331994A

Abstract

A pouch battery module (1) and a packing method therefor, a battery pack (10), and an electric device. The packing method for the pouch battery module (1) comprises connecting tabs of at least two battery cells (11), so that the at least two battery cells (11) jointly form a battery connection group (P); and folding the battery connection group (P), so that the at least two battery cells (11) are arranged in a stacked manner. The packing method for the pouch battery module (1) involves: firstly, connecting tabs of a plurality of battery cells (11) to form a battery connection group (P); and then folding the battery connection group (P), so as to pack the battery cells (11) without the need for a harness isolation plate. The production efficiency is high, and a harness isolation plate is omitted, such that the length of a pouch battery module (1) is not limited by the length of the harness isolation plate, thereby facilitating the production of pouch battery modules (1) having different lengths.

Description

Soft pack battery module and its grouping method, battery pack and electrical equipment

This application is required to be submitted to the Chinese Patent Office on November 19, 2019. The application number is 201911134962.5, and the title of the invention is "soft pack battery modules and their assembly methods, battery packs and equipment using soft pack battery modules as power sources." The priority of the Chinese patent application, the entire content of which is incorporated in this application by reference.

Technical field

This application relates to the field of battery technology, and in particular to a soft-packed battery module and its grouping method, battery pack and electrical equipment.

Background technique

The mechanical strength of the tabs of the soft-pack battery cells is relatively weak. When grouping, the copper bars fixed on the wire harness isolation plate are usually used for support. Generally, the tabs of the soft-pack battery cells are passed through the wire harness isolation plate first. Ride on the copper bar for welding. When the string number of the module is high, the length of the module is also longer. At this time, more tabs are required to pass through the wiring harness isolation plate, which makes it difficult to operate and it is more difficult to inject the longer wiring harness isolation plate. Therefore, the cost is high.

Summary of the invention

The purpose of this application is to provide a soft-packed battery module and its assembly method, battery pack and electrical equipment to improve production efficiency.

The first aspect of the present application provides a method for assembling a soft-packed battery module. The battery module includes at least two battery cells. The battery cells are soft-packed batteries and have tabs. The tabs are used to make at least two battery cells jointly form a battery connection group, and the battery connection group is folded to make the at least two battery cells stacked and arranged.

In some embodiments, connecting the tabs of the at least two battery cells includes connecting the tabs of the at least two battery cells by using a connecting piece.

In some embodiments, the connecting piece is welded to the tab.

In some embodiments, the grouping method further includes laying the large surfaces of the at least two battery cells flat and sequentially arranging them in at least one row before connecting the tabs of the at least two battery cells.

In some embodiments, the grouping method further includes, before connecting the tabs of the at least two battery cells, dividing the at least two battery cells into at least two battery cell groups; The large surfaces of the battery cells are laid flat and sequentially arranged in at least one row; the battery cell groups are stacked in the thickness direction of the battery cells.

In some embodiments, the tabs connecting the at least two battery cells include tabs connecting the battery cells at corresponding positions of the at least two battery cell groups.

In some embodiments, the tabs extend in a first direction relative to the battery cells, and the second direction is perpendicular to the first direction, and the folded battery connection group includes a first pair of fold lines in the first direction and/or in the second direction. Fold the battery connection pack on the second pair of fold lines.

In some embodiments, folding the battery connection group includes folding the battery connection group at least twice along a first pair of fold lines in the first direction; and/or, folding the battery cell connection group includes a second direction along the second direction. Fold the battery connection group at least twice on the folding line.

In some embodiments, in at least two folds, two adjacent folds have opposite directions.

In some embodiments, in the at least two folds, there is one battery cell or at least two battery cells spaced between the fold lines of two adjacent folds.

In some embodiments, the grouping method further includes after forming the battery connection group, in the thickness direction of the battery cell, a first insulating film is attached to both sides of the battery connection group and the first insulating film is connected to the battery connection group. Fold together.

In some embodiments, the first insulating film is coated on the battery connection group by using a hot pressing technique.

In some embodiments, the grouping method further includes laying a heating film on at least one of the first insulating films on both sides of the battery connection group in the thickness direction of the battery cells, and placing the first insulating film on at least one of the first insulating films. The insulating film, the heating film, and the battery connection group are folded together.

In some embodiments, the grouping method further includes attaching a second insulating film on one side of the heating film, and folding the first insulating film, the heating film, the second insulating film, and the battery connection group together.

In some embodiments, the grouping method further includes connecting the circuit board to the battery connection group before attaching the first insulating film, the first insulating film is pasted on the battery connection group and the circuit board, and the battery connection group, the first insulating film are attached to the battery connection group and the circuit board. An insulating film and the circuit board are folded together.

A second aspect of the present application provides a soft-packed battery module, which includes at least two battery stack layers and a plurality of connecting pieces that are stacked and arranged in the thickness direction of the battery cells, the plurality of connecting pieces include interlayer connecting pieces, The sheet is at least partially covered by an insulating material and has a bent structure to connect the battery cells respectively on the two battery stack layers in the thickness direction.

In some embodiments, the interlayer connecting sheet includes two end sections and a middle section connecting the two end sections, and the middle section has an arc-shaped bending structure.

In some embodiments, the end section is a planar structure; or, the end section is an arc-shaped bent structure.

In some embodiments, the plurality of connecting pieces further include end connecting pieces, which are connected to the tabs of the battery cells at the uppermost layer or the lowermost layer in the thickness direction and protrude from the soft pack battery module On the outside, the end connecting piece forms the output end of the soft pack battery module.

In some embodiments, the end connecting piece has a planar structure.

In some embodiments, each battery stack layer includes one battery cell or more than two battery cells.

In some embodiments, the soft-pack battery module further includes a first insulating film attached to both sides of the battery stack layer and the connecting sheet, and the connecting sheet further includes an interlayer connecting sheet, which is connected to the battery stack on the For the tabs of adjacent battery cells, the first insulating film includes a bent insulating film attached to the interlayer connection sheet and a plane arranged on both sides of the bent insulating film and attached to the battery stack layer and the interlayer connection sheet Insulating film, bending the insulating film to connect the flat insulating film.

In some embodiments, the soft-pack battery module further includes a heating film attached to the first insulating film, and the heating film includes a bending heating film attached to the bending insulating film and a heating film attached to the flat insulating film. Flat heating film.

In some embodiments, the soft-pack battery module further includes a second insulating film attached to the heating film, and the second insulating film includes a bending insulating film attached to the bending heating film and a flat heating film. Plane insulating film on top.

In some embodiments, the soft-pack battery module further includes a circuit board electrically connected to the connecting sheet, and the circuit board includes a circuit board plane section extending along the battery stack layer and a circuit board disposed between two adjacent circuit board plane sections. Circuit board bending section.

A third aspect of the present application provides a battery pack, including a box body and the soft-packed battery module of any one of the second aspect of the present application, and the soft-packed battery module is contained in the box.

A fourth aspect of the present application provides an electrical device, including a driving device and the soft-pack battery module of any one of the second aspect of the present application. The driving device is used to provide driving force for the device, and the battery module is configured to provide Provide electricity.

Based on the technical solution provided in this application, the grouping method of the soft pack battery module first connects the tabs of multiple battery cells to form a battery connection group, and then folds the battery connection group to realize the battery can be connected without a wire harness isolation plate. The monomers are grouped, and the production efficiency is high. In addition, the wire harness isolation plate is omitted, so that the length of the flexible battery module of the present application is not limited by the length of the wire harness isolation plate, so that it is convenient to produce flexible battery modules of different lengths.

Through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings, other features and advantages of the present application will become clear.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the application;

FIG. 2 is a schematic diagram of the structure of the battery pack in FIG. 1;

FIG. 3 is a schematic diagram of the structure of a battery cell according to an embodiment of the application;

FIG. 4 is a schematic structural diagram of a battery connection group according to an embodiment of the application;

FIG. 5 is an exploded schematic diagram of hot pressing the battery connection group shown in FIG. 4;

6 is a schematic diagram of a three-dimensional structure of a soft-packed battery module formed by folding the battery connection group shown in FIG. 4;

FIG. 7 is a cross-sectional view of the soft pack battery module shown in FIG. 6;

FIG. 8 is a schematic top view of a soft-pack battery module according to another embodiment of the application;

9 to 13 are schematic diagrams of a grouping method of soft-packed battery modules according to another embodiment of the application;

14 to 17 are schematic diagrams of a grouping method of soft-packed battery modules according to another embodiment of this application;

18 is a schematic structural diagram of another battery cell according to an embodiment of the application;

FIG. 19 is a schematic structural diagram of another connecting piece according to an embodiment of the application;

20 to 24 are schematic diagrams of a method for grouping the battery cells shown in FIG. 18;

25 to 27 are schematic diagrams of another method for grouping the battery cells shown in FIG. 18.

The reference signs respectively represent:

1. Soft pack battery module;

11. Battery cell;

111. Negative ear; 112. Positive ear;

12. Connecting piece; 12A, welding area;

121. Interlayer connecting piece; 1211, end section; 1212, middle section; 122, end connecting piece; 123, inner connecting piece;

13. The first insulating film;

14. Heating film;

15. Circuit board;

16. The second insulating film;

2. Upper box body;

3. Lower cabinet;

10. Battery pack;

20. The main body of the vehicle;

X. The first direction;

Y, the second direction;

Z. The thickness direction of the battery cell;

P. Battery connection group;

Q. Stacked battery layers;

I. The first pair of broken lines;

J. The second pair of broken lines.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any restriction on the application and its application or use. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn in accordance with actual proportional relationships. The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the authorization specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

For ease of description, spatially relative terms can be used here, such as "above", "above", "above the surface", "above", etc., to describe as shown in the figure Shows the spatial positional relationship between one device or feature and other devices or features. It should be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the drawing is turned upside down, then a device described as "above other devices or structures" or "above other devices or structures" will then be positioned as "below the other devices or structures" or "on Under other devices or structures". Thus, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways, and the relative description of the space used here will be explained accordingly.

The embodiment of the present application provides a grouping method of electrical equipment using the soft-pack battery module 1 as a power source, the battery pack 10, the soft-pack battery module 1, and the soft-pack battery module 1. The electrical equipment includes a soft-pack battery module 1 and a driving device for providing driving force for the electrical equipment, and the soft-pack battery module 1 provides electric power to the driving device. The driving force of the electrical equipment can be all electric energy, part of it can be electric energy, and part of it can be other energy sources. For example, the electrical equipment may also include a power source that provides mechanical energy such as an engine. As long as the device using the soft pack battery module 1 as a power source is within the protection scope of the present application.

The electrical equipment in the embodiments of the present application may be mobile equipment such as vehicles, ships, and small airplanes. Taking a vehicle as an example, the vehicle in the embodiment of the present application may be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. As shown in FIG. 1, the vehicle includes a battery pack 10 and a vehicle main body 20. The battery pack 10 is disposed in the vehicle main body 20 and includes at least one soft pack battery module 1. The vehicle body 20 is provided with a drive motor, which is electrically connected to the battery pack 10, and the battery pack 10 provides electric energy for the drive motor. The drive motor is connected to wheels on the vehicle body 20 through a transmission mechanism to drive the vehicle. Specifically, the battery pack 10 may be horizontally arranged at the bottom of the vehicle body 20.

The battery pack 10 of the embodiment of the present application includes at least one soft pack battery module 1. Specifically, in this embodiment, as shown in FIG. 2, the battery pack 10 of this embodiment includes a plurality of soft-packed battery modules 1 and a box for accommodating the plurality of soft-packed battery modules 1. The box has an accommodating cavity, and a plurality of soft-pack battery modules 1 are arranged in the accommodating cavity. Specifically, the box of this embodiment is a box-shaped box and includes a lower box 3 for accommodating the soft pack battery module 1 and an upper box 2 that is closed with the lower box 3. In other embodiments not shown in the drawings, the box may also have other shapes such as a frame-shaped box, a disk-shaped box, or the like.

In this embodiment, as shown in FIG. 3, the battery cell 11 is provided with tabs. The tabs include a positive electrode 112 and a negative electrode 111. In this embodiment, the positive electrode 112 and the negative electrode 111 are both located on the battery. The same end of monomer 11. The tabs extend in the first direction X relative to the battery cell 11, and the second direction Y is perpendicular to the first direction X.

The method of forming the soft-packed battery module 1 by grouping a plurality of the battery cells 11 is shown in FIG. 4 and FIG. 5. Specifically, the large surfaces of the plurality of battery cells 11 are laid flat and arranged in two rows in sequence; The connecting piece 12 is used to connect the tabs of the multiple battery cells 11 so that the multiple battery cells 11 together form a battery connection group P; the battery connection group P is folded so that the multiple battery cells 11 are stacked and arranged. The grouping method of the soft pack battery module 1 of this embodiment first connects the tabs of a plurality of battery cells 11 to form the battery connection group P, and then folds the battery connection group P to realize that the battery can be connected without a wire harness isolation plate. The monomers 11 are grouped, and the production efficiency is high.

In other embodiments, the tabs of the multiple battery cells 11 may be directly connected without connecting pieces.

In order to enhance the insulation between the connecting sheets 12 and the insulation between the battery cells 11, as shown in FIG. 5, the grouping method of the soft-packed battery module 1 of this embodiment further includes setting the thickness direction Z of the battery cells 11 Above, the first insulating film 13 is attached to both sides of the battery connection group P, and the first insulating film 13 and the battery connection group P are folded together. Specifically, the first insulating film 13 is covered on the battery connection group P by hot pressing technology. The first insulating film 13 is attached to the battery cell 11 and the connecting sheet 12 in this embodiment, and the first insulating film 13 connects the battery cell 11 and the connecting sheet 12 into one body to facilitate folding. Moreover, the first insulating film 13 is attached to both sides of the battery cell 11 to enhance the strength of the battery cell 11.

In order to realize the integrated heating film function, the grouping method of this embodiment further includes laying a layer of heating film 14 and a layer of second insulating film 16 on the first insulating film 13 in sequence, and connecting the battery group P and the first insulating film. The film 13, the heating film 14, and the second insulating film 16 are folded together. Among them, the heating film 14 may be a thermally conductive aluminum plate.

After the battery connection group P is wrapped, as shown by the arrows in FIG. 4, the wrapped battery connection group P is folded multiple times along the first pair of fold lines I in the first direction X to form a soft package Battery module 1.

In the above-mentioned multiple folds, the two adjacent folds have opposite directions. Specifically, a bending device is used to perform a serpentine bending on the covered battery connection group P.

As shown in FIGS. 6 and 7, the soft-pack battery module 1 formed by the grouping method of this embodiment includes at least two battery stack layers Q and a plurality of connecting pieces arranged in a stack in the thickness direction Z of the battery cell 11 12. The plurality of connecting pieces 12 includes an interlayer connecting piece 121, which is at least partially covered by an insulating material and has a bent structure to connect the batteries on the two battery stack layers Q in the thickness direction Z. Monomer 11. The soft-packed battery module 1 of this embodiment uses the interlayer connecting sheet 121 covered with an insulating material to connect the battery cells 11 respectively on the two battery stack layers Q, without the need for the wiring harness isolation plate in the prior art, so that The length of the soft-packed battery module 1 of this embodiment is not limited by the length of the wire harness isolation plate, so it is convenient to produce soft-packed battery modules 1 of different lengths.

As shown in FIG. 7, the interlayer connecting sheet 121 includes two end sections 1211 and a middle section 1212 connecting the two end sections 1211, and the middle section 1212 has an arc-shaped bending structure. The two end sections 1211 are respectively connected to the battery cells 11 on the two adjacent battery stack layers Q. As shown in FIG. 4, before grouping, the interlayer connecting sheet 121 of this embodiment has a rectangular structure, and it is folded during the grouping process so that the interlayers can be placed in the soft pack battery module 1 after the grouping. The connecting piece 121 has a bent structure.

In this embodiment, the end section 1211 is a planar structure. Such arrangement allows the end section 1211 to be directly attached to the tabs of the battery cell 11 to reduce the volume of the entire soft-pack battery module 1.

The interlayer connection sheet 121 of this embodiment is at least partially covered with an insulating material to avoid contact between two adjacent interlayer connection sheets 121 in the thickness direction Z of the battery cell 11 and cause a short circuit, specifically, as shown in FIG. As shown in 7, at least partly refers to the outer surface of the middle section 1212 of the interlayer connecting sheet 121.

As shown in FIGS. 6 and 7, the multiple connecting pieces 12 of this embodiment further include end connecting pieces 122, which are connected to the uppermost and lowermost battery cells 11 in the thickness direction Z. The tabs are on and extend outside the soft-pack battery module 1, and the end connecting piece 122 forms the output end of the soft-pack battery module 1.

Specifically, the end connecting piece 122 of this embodiment has a planar structure.

As shown in FIG. 5, it can be seen from the grouping method of the soft pack battery module 1 of this embodiment that the first insulating film 13 is attached to both sides of the interlayer connecting sheet 121 and is bent together with the interlayer connecting sheet 121. Specifically, Ground, the soft-pack battery module 1 of this embodiment further includes a first insulating film 13 attached to both sides of the battery stack layer Q and the connecting sheet 12, respectively, the first insulating film 13 includes being attached to the interlayer connecting sheet 121 The bent insulating film and the planar insulating film arranged on both sides of the bent insulating film and attached to the battery stack layer Q, and the bent insulating film is connected to the planar insulating film.

In this embodiment, the soft-pack battery module 1 further includes a heating film 14 attached to the first insulating film 13. The heating film 14 includes a bending heating film attached to the bending insulating film and a flat surface. Flat heating film on insulating film.

In this embodiment, the soft-pack battery module 1 further includes a second insulating film 16 attached to the heating film 14. The second insulating film 16 includes a bending insulating film attached to the bending heating film and a bonding film. The flat insulating film on the flat heating film.

As shown in FIG. 6, the size of the soft-pack battery module 1 in the thickness direction of the battery cell 11 is the height of the soft-pack battery module 1, and the size in the first direction X is the length of the soft-pack battery module 1. , The dimension in the second direction Y is the width of the soft pack battery module 1.

As shown in FIG. 4 again, a battery cell 11 is arranged between the first pair of fold lines I of two adjacent two foldings in the multiple folding of this embodiment. The arrangement is such that each battery stack layer Q of the soft-pack battery module 1 of this embodiment has one battery cell 11 in the second direction Y. That is to say, in practical applications, the number of battery cells 11 between the first pair of fold lines I between two folds can be adjusted according to requirements so as to adjust the width of the soft pack battery module 1.

In this embodiment, a plurality of battery cells 11 are laid flat and arranged in two rows. As shown in FIG. 6, each battery stack layer Q formed includes two battery cells 11 arranged in the first direction X.

In another embodiment, when grouped, a plurality of battery cells 11 are laid flat and arranged in a row to form a soft-packed battery module 1 as shown in FIG. 8. At this time, each battery stack layer Q includes one Battery cell 11.

In another embodiment, as shown in FIG. 9, the large surfaces of a plurality of battery cells 11 are laid flat and arranged in two rows, and a certain distance is left between the battery cells 11 and the battery cells 11; The connecting piece 12 is overlapped between the tabs of the battery cell 11 and the connecting tab 12 is welded to the tabs of the battery cell 11, and one connecting tab 12 is connected to the tabs of four adjacent battery cells 11 respectively. welding. As shown in Figure 10, the first insulating film 13 is then used to cover the upper and lower sides of the battery connection group P by using the hot pressing technology to ensure the insulation between the connection sheets 12 after the group is formed. At this time, the electrical circuit of the entire module is The assembly has been completed. As shown in FIG. 11, finally, the flat battery connection group P is folded along the first pair of fold lines I in the first direction X by automated equipment to obtain a stacked soft-pack battery module 1.

Specifically, in this embodiment, as shown by the arrow in FIG. 11, the battery connection group P is folded twice. In addition, a plurality of battery cells 11 are spaced between the two folding lines. As shown in FIGS. 12 and 13, each battery stack layer Q of the soft-packed battery module 1 thus folded includes a plurality of battery cells in the second direction Y. Therefore, the grouping method of this embodiment can adjust the number of folds and the position of the fold line according to requirements to adjust the number of battery stack layers Q of the soft pack battery module 1 and the number of battery cells 11 on each battery stack layer Q. Thus, the flexible battery modules 1 of different lengths and heights are stacked.

Compared with the connecting piece 12 of the embodiment shown in FIG. 4, the connecting piece 12 of the embodiment shown in FIG. 9 is also rectangular, but wider. Therefore, in practical applications, the size of the connecting piece 12 can be adjusted according to actual requirements.

As shown in FIGS. 11 to 13, the multiple connecting pieces 12 of the soft pack battery module 1 of this embodiment include an interlayer connecting piece 121, an end connecting piece 122, and an interlayer connecting piece 123, wherein the interlayer connecting piece 121 is covered by an insulating material and has a bent structure to connect the battery cells 11 on the two battery stack layers Q in the thickness direction Z; the end connecting piece 122 is connected to the uppermost layer in the thickness direction Z and On the tabs of the lowermost battery cell 11 and protruding outside the soft-pack battery module 1, the end connecting piece 122 forms the output end of the soft-pack battery module 1; the inner connecting piece 123 is connected in the second direction Tabs of adjacent battery cells 11 on Y.

Preferably, the grouping method of this embodiment further includes connecting a circuit board 15 to the battery connection group P, and the circuit board 15 is electrically connected to the plurality of connecting pieces 12. Then, the first insulating film 13 is attached to the battery connection group P and the circuit board 15, and the battery connection group P, the first insulating film 13 and the circuit board 15 are folded together. Specifically, in this embodiment, the circuit board 15 may be FPC, PCB, FFC, or the like. The circuit board 15 is used to collect information of the battery cells 11. Preferably, the circuit board 15 is a flexible circuit board, such as an FPC; the flexible circuit board is flexible and small in size, which can save internal space for the assembled battery module.

The circuit board 15 of the soft pack battery module 1 formed by the group method of this embodiment includes a circuit board plane section extending along the battery stack layer Q and a circuit board bent between two adjacent circuit board plane sections segment.

In order to realize the integrated heating function, the grouping method of this embodiment also includes laying the heating film 14 and the second insulating film 16 on the first insulating film 13 in sequence, and connecting the battery group P, the first insulating film 13, and the circuit board. 15. The heating film 14 and the second insulating film 16 are folded together.

Specifically, the first insulating film 13 includes a bent insulating film attached to the interlayer connecting sheet 121 and a planar insulating film disposed on both sides of the bent insulating film and attached to the battery stack layer Q and the interlayer connecting sheet 123. Film, bending the insulating film to connect the plane insulating film.

Figures 14 to 17 show a grouping method according to another embodiment of the present application. The grouping method of this embodiment includes dividing at least two battery cells 11 into at least two battery cell groups equally; laying the large surfaces of the battery cells 11 of each battery cell group flat and sequentially arranging them in at least one row ; Stack each battery cell group in the thickness direction Z of the battery cell 11; then use the connecting piece 12 to connect the tabs of the battery cell 11.

Specifically, as shown in the enlarged structure of the M section as shown in FIG. 16, the connecting sheet 12 is placed between the two tabs of the upper and lower layers of the battery cells 11 of the two battery cell groups stacked and welded to realize the alignment. The connection of the tabs.

After the battery cells 11 are connected, the battery connection group P shown in FIGS. 14 and 15 is formed. The battery connection group P has a double-layer structure. Then, the battery connection group P is folded multiple times to form the soft-packed battery module 1 as shown in FIG. 17.

Similarly, the soft-pack battery module 1 includes at least two battery stack layers Q and a plurality of connecting sheets 12 arranged in a stack in the thickness direction Z of the battery cell 11, and the plurality of connecting sheets 12 includes an interlayer connecting sheet 121. The intermediate connecting piece 121 is covered with an insulating material and has a bent structure to connect the battery cells 11 respectively on the two battery stack layers Q in the thickness direction Z. Specifically, the interlayer connecting sheet 121 includes two end sections 1211 and a middle section 1212 connecting the two end sections 1211, and the middle section 1212 is an arc-shaped bending structure. The two end sections 1211 are respectively connected to the battery cells 11 on the two adjacent battery stack layers Q.

Specifically, in this embodiment, the end section 1211 has a planar structure.

In other embodiments, as shown in FIG. 18, the positive lug 112 and the negative lug 111 of the battery cell 11 of this embodiment are respectively located at the two ends of the battery cell 11. The extension direction of the tab relative to the battery cell 11 is the first direction X, and the second direction Y is perpendicular to the first direction X.

The grouping method of the battery cells 11 to form the soft-packed battery module 1 will be described in detail below based on FIGS. 19-27.

In one embodiment, as shown in FIG. 20, a plurality of battery cells 11 are laid flat on the tooling, and a certain distance is left between adjacent battery cells 11. Then, the tabs 12 of the U-shaped structure as shown in FIG. 19 are used to connect the tabs of the battery cells 11 to form a battery connection group P.

The connecting piece 12 has four welding areas 12A welded to four adjacent tabs. As shown in FIG. 21, the battery connection group P is folded once along the first pair of fold lines I in the first direction X, and then the battery connection group P is folded twice along the second pair of fold lines J in the second direction Y. It is folded to form the pouch battery module 1 shown in FIGS. 23 and 24.

Similarly, the soft-pack battery module 1 of this embodiment includes at least two battery stack layers Q and a plurality of connecting pieces 12 arranged in a stack in the thickness direction Z of the battery cell 11, and the plurality of connecting pieces 12 include interlayer connecting pieces. 121. The interlayer connecting sheet 121 is covered by an insulating material and has a bent structure to connect the battery cells 11 respectively on the two battery stack layers Q in the thickness direction Z.

Different from other embodiments, in this embodiment, the two end sections 1211 of the interlayer connecting sheet 121 and the middle section 1212 connecting the two end sections 1211, the middle section 1212 has an arc-shaped bending structure. The two end sections 1211 are respectively connected to the battery cells 11 on the two adjacent battery stack layers Q. And the end section 1211 has an arc-shaped bending structure.

In another embodiment, as shown in FIGS. 25 and 26, a plurality of battery cells 11 are first laid flat on the tooling. Then, connecting tabs 12 are used to connect the tabs of adjacent battery cells 11 to form a battery connection group P. Then the battery connection group P is folded multiple times along the first pair of fold lines I in the first direction X, and the two adjacent folding directions in the multiple folds are opposite to form the soft-packed battery module 1 as shown in FIG. 27 .

Different from other embodiments, as shown in FIG. 27, the two battery cells 11 on each battery stack layer Q of the soft pack battery module 1 of this embodiment are connected in parallel.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: The specific implementation of the application is modified or some technical features are equivalently replaced; without departing from the spirit of the technical solution of this application, all of them should be covered in the scope of the technical solution claimed by this application.

Claims

A grouping method of a soft pack battery module, the battery module (1) comprises at least two battery cells (11), the battery cell (11) is a soft pack battery and has tabs, the Grouping methods include:

Connecting the tabs of the at least two battery cells (11) so that the at least two battery cells (11) together form a battery connection group (P);

The battery connection group (P) is folded so that the at least two battery cells (11) are stacked and arranged.
The grouping method of the soft-pack battery module according to claim 1, wherein the connecting the tabs of the at least two battery cells (11) comprises connecting the at least two battery cells with a connecting piece (12) (11) The extreme ears.
The grouping method of the soft-packed battery module according to claim 2, wherein the connecting piece (12) is welded to the tab.
The grouping method of soft-pack battery modules according to any one of claims 1 to 3, wherein the grouping method further comprises before connecting the tabs of the at least two battery cells (11), The large surfaces of the at least two battery cells (11) are laid flat and arranged in at least one row in sequence.
The grouping method of soft-pack battery modules according to any one of claims 1 to 4, wherein the grouping method further comprises before connecting the tabs of the at least two battery cells (11), Divide the at least two battery cells (11) into at least two battery cell groups equally; lay the large surfaces of the battery cells (11) of each battery cell group flat and arrange them in at least one row; The battery cell groups are stacked in the thickness direction (Z) of the battery cells (11).
The grouping method of the soft-pack battery module according to claim 5, wherein the tabs connecting the at least two battery cells (11) include connecting the batteries at corresponding positions of the at least two battery cell groups The tabs of the monomer (11).
The grouping method of soft-pack battery modules according to any one of claims 1-6, wherein the tabs extend in a first direction (X) relative to the battery cells (11), and the second The direction (Y) is perpendicular to the first direction (X), and folding the battery connection pack (P) includes a first pair of folding lines (I) in the first direction (X) and/or along the first direction (X). The second pair of folding lines (J) in the two directions (Y) fold the battery connection group (P).
The grouping method of soft-packed battery modules according to claim 7, wherein folding the battery connection group (P) comprises aligning the battery along a first pair of folding lines (I) in the first direction (X). The battery connection group (P) is folded at least twice; and/or, the folded battery cell connection group (P) includes a second pair of folding lines (J) in the second direction (Y) to fold the battery The connecting group (P) is folded at least twice.
8. The grouping method of soft-packed battery modules according to claim 8, wherein in the at least two foldings, two adjacent foldings have opposite directions.
The grouping method of soft-pack battery modules according to any one of claims 8-9, wherein, in the at least two foldings, there is a battery cell spaced between two adjacent fold lines of the two foldings. Body (11) or at least two battery cells (11).
The grouping method of soft-packed battery modules according to any one of claims 1-10, wherein the grouping method further comprises after forming the battery connection group (P), after the battery cell In the thickness direction (Z) of (11), a first insulating film (13) is attached to both sides of the battery connection group (P) and the first insulating film (13) and the battery connection group ( P) Fold together.
The grouping method of the soft-packed battery module according to claim 11, wherein the first insulating film (13) is covered on the battery connection group (P) by using a hot pressing technique.
The grouping method of soft-packed battery modules according to any one of claims 11-12, wherein the grouping method further comprises in the thickness direction (Z) of the battery cell (11), so A heating film (14) is laid on at least one of the first insulating films (13) on both sides of the battery connection group (P), and the first insulating film (13), the The heating film (14) and the battery connection group (P) are folded together.
The grouping method of soft-pack battery modules according to claim 13, wherein the grouping method further comprises attaching a second insulating film (16) on one side of the heating film (14), and placing the The first insulating film (13), the heating film (14), the second insulating film (16) and the battery connection group (P) are folded together.
The grouping method of soft-packed battery modules according to any one of claims 11-14, wherein the grouping method further comprises placing the battery before attaching the first insulating film (13). The circuit board (15) is connected to the connection group (P), the first insulating film (13) is attached to the battery connection group (P) and the circuit board (15), and the battery connection group ( P), the first insulating film (13) and the circuit board (15) are folded together.
A soft-pack battery module, comprising at least two battery stack layers (Q) and a plurality of connecting pieces (12) stacked in a thickness direction (Z) of a battery cell (11), and the plurality of connecting pieces ( 12) Including an interlayer connecting sheet (121), the interlayer connecting sheet (121) is at least partially covered with an insulating material and has a bent structure to connect in the thickness direction (Z) in the two battery stacks respectively Battery cell (11) on layer (Q).
The soft-pack battery module according to claim 16, wherein the interlayer connecting sheet (121) includes two end sections (1211) and a middle section (1212) connecting the two end sections (1211). ), the middle section (1212) is an arc-shaped bending structure.
The soft-pack battery module according to claim 17, wherein the end section (1211) is a planar structure; or, the end section (1211) is an arc-shaped bending structure.
The soft-pack battery module according to any one of claims 16-18, wherein the plurality of connecting pieces (12) further comprise an end connecting piece (122), and the end connecting piece (122) is connected to On the tabs of the battery cell (11) in the uppermost layer or the lowermost layer in the thickness direction (Z) and protruding out of the soft-pack battery module (1), the end connecting piece (122) Form the output terminal of the soft pack battery module (1).
The soft-pack battery module according to claim 19, wherein the end connecting piece (122) has a planar structure.
The soft-pack battery module according to any one of claims 16-20, wherein each battery stack layer (Q) includes one battery cell (11) or more than two battery cells (11).
The soft-packed battery module according to any one of claims 16-21, wherein the soft-packed battery module (1) further comprises respectively attached to the battery stack layer (Q) and the connecting piece (12) The first insulating film (13) on both sides, the connecting piece (12) also includes an interlayer connecting piece (123), the interlayer connecting piece (123) is connected to the battery stack layer (Q) The tabs of adjacent battery cells (11), the first insulating film (13) includes a bent insulating film attached to the interlayer connecting sheet (121) and a bent insulating film disposed on the bent insulating film The two sides of the film are attached to the flat insulating film on the battery stack layer (Q) and the interlayer connecting sheet (123), and the bent insulating film is connected to the flat insulating film.
The soft-pack battery module according to claim 22, wherein the soft-pack battery module (1) further comprises a heating film (14) attached to the first insulating film (13), and the heating The film (14) includes a bending heating film attached to the bending insulating film and a flat heating film attached to the flat insulating film.
The soft-pack battery module according to claim 23, wherein the soft-pack battery module (1) further comprises a second insulating film (16) attached to the heating film (14), and the second insulating film (16) is attached to the heating film (14). The second insulating film (16) includes a bending insulating film attached to the bending heating film and a flat insulating film attached to the flat heating film.
The soft-pack battery module according to any one of claims 16-24, wherein the soft-pack battery module (1) further comprises a circuit board (15) electrically connected to the connecting piece (12), The circuit board (15) includes a circuit board plane section extending along the battery stack layer (Q) and a circuit board bending section arranged between two adjacent circuit board plane sections.
A battery pack comprising a box body and the soft-pack battery module according to any one of claims 16-25, and the soft-pack battery module is contained in the box body.
An electrical equipment, comprising a driving device and the soft-pack battery module according to any one of claims 16-25, the driving device is used to provide driving force for the electrical equipment, the battery module It is configured to provide electrical energy to the driving device.