CN112331994A

CN112331994A - Soft-package battery module, grouping method thereof, battery pack and equipment using soft-package battery module as power supply

Info

Publication number: CN112331994A
Application number: CN201911134962.5A
Authority: CN
Inventors: 汪用广; 王鹏; 陈兴地; 唐彧; 游凯杰
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-02-05
Also published as: WO2021098464A1

Abstract

The invention discloses a soft-package battery module, a grouping method thereof, a battery pack and equipment using the soft-package battery module as a power supply. The grouping method of the soft package battery module comprises the steps of connecting tabs of at least two battery monomers to enable the at least two battery monomers to jointly form a battery connection group; the battery connection pack is folded such that at least two battery cells are stacked and arranged. The grouping method of the soft package battery module is characterized in that the lugs of the battery monomers are connected firstly to form a battery connection group, then the battery connection group is folded, so that the battery monomers can be grouped without a wiring harness isolation plate, and the production efficiency is high. And moreover, a wiring harness isolation plate is omitted, so that the length of the soft package battery module is not limited by the length of the wiring harness isolation plate, and the soft package battery modules with different lengths can be produced conveniently.

Description

Soft-package battery module, grouping method thereof, battery pack and equipment using soft-package battery module as power supply

Technical Field

The invention relates to the technical field of batteries, in particular to a soft-package battery module, a grouping method of the soft-package battery module, a battery pack and equipment using the soft-package battery module as a power supply.

Background

The single tab of laminate polymer battery mechanical strength is relatively weak, generally need play the supporting role with the help of the copper bar of fixing on the pencil division board when uniting, generally passes the single tab of laminate polymer battery pencil division board earlier and takes the welding on the copper bar again. When the cluster number of module is higher, the length of module is also longer, needs to have more utmost point ear to pass the pencil division board this moment, causes the difficulty of operation and the pencil division board that length is longer like this and moulds plastics the degree of difficulty great, therefore the cost is very high.

Disclosure of Invention

The invention aims to provide a soft-package battery module, a grouping method thereof, a battery pack and equipment using the soft-package battery module as a power supply, so that the production efficiency is improved.

The invention provides a method for grouping a soft package battery module, wherein the battery module comprises at least two battery monomers, the battery monomers are soft package batteries and are provided with tabs, and the method comprises the following steps:

connecting the lugs of the at least two battery monomers to enable the at least two battery monomers to form a battery connection group together;

the battery connection pack is folded such that at least two battery cells are 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 using a connecting tab.

In some embodiments, the tabs are welded to the tabs.

In some embodiments, the grouping method further comprises placing the large faces of the at least two battery cells flat and sequentially arranging the large faces into at least one row before connecting the tabs of the at least two battery cells.

In some embodiments, the grouping method further comprises, before connecting the tabs of the at least two battery cells, equally dividing the at least two battery cells into at least two battery cell groups; flatly placing the large surfaces of the single batteries of each single battery pack and sequentially arranging the large surfaces of the single batteries into at least one row; the battery cell groups are stacked in the thickness direction of the battery cells.

In some embodiments, connecting the tabs of the at least two battery cells includes connecting tabs of battery cells at corresponding locations of the at least two battery cell stacks.

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

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

In some embodiments, at least two of the folds are in opposite directions from adjacent folds.

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

In some embodiments, the grouping method further includes attaching first insulating films to both sides of the battery connection group in a thickness direction of the battery cells and folding the first insulating films together with the battery connection group after forming the battery connection group.

In some embodiments, the first insulating film is wrapped around the battery connection set 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 folding the first insulating film, the heating film, and the battery connection group together.

In some embodiments, the grouping method further comprises attaching a second insulating film to 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 comprises attaching a circuit board to the battery connection group before attaching a first insulating film to the battery connection group and the circuit board, and folding the battery connection group, the first insulating film, and the circuit board together.

The invention provides a soft package battery module, which comprises at least two battery stacking layers stacked and arranged in the thickness direction of a battery monomer and a plurality of connecting sheets, wherein the connecting sheets comprise interlayer connecting sheets, at least parts of the interlayer connecting sheets are coated by insulating materials and are of bending structures so as to connect the battery monomer respectively positioned on the two battery stacking layers in the thickness direction.

In some embodiments, the interlayer connecting piece comprises two end sections and a middle section for connecting the two end sections, and the middle section is of an arc-shaped bent structure.

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

In some embodiments, the plurality of connecting pieces further include an end connecting piece, the end connecting piece is connected to the tab of the battery cell at the uppermost layer or the lowermost layer in the thickness direction and extends out of the soft package battery module, and the end connecting piece forms an output end of the soft package battery module.

In some embodiments, the end tabs are planar structures.

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

In some embodiments, the flexible package battery module further comprises first insulating films respectively attached to two sides of the battery stack layer and the connecting sheet, the connecting sheet further comprises an intra-layer connecting sheet, the intra-layer connecting sheet is connected with the tabs of the adjacent single batteries on the battery stack layer, the first insulating film comprises a bent insulating film attached to the inter-layer connecting sheet and planar insulating films arranged on two sides of the bent insulating film and attached to the battery stack layer and the intra-layer connecting sheet, and the bent insulating film is connected with the planar insulating films.

In some embodiments, the soft package battery module further comprises a heating film attached to the first insulating film, wherein the heating film comprises a bent heating film attached to the bent insulating film and a planar heating film attached to the planar insulating film.

In some embodiments, the pouch battery module further includes a second insulating film attached to the heating film, and the second insulating film includes a bent insulating film attached to the bent heating film and a planar insulating film attached to the planar heating film.

In some embodiments, the pouch battery module further includes a circuit board electrically connected to the connecting tab, and the circuit board includes a circuit board plane section extending along the battery stack layer and a circuit board bent section disposed between two adjacent circuit board plane sections.

The invention provides a battery pack, which comprises a box body and the soft package battery module in any one of the second aspects of the invention, wherein the soft package battery module is accommodated in the box body.

The invention provides equipment using the pouch battery module as a power supply, which comprises a driving device and the pouch battery module of any one of the second aspects of the invention, wherein the driving device is used for providing driving force for the equipment, and the battery module is configured to provide electric energy for the driving device.

Based on the technical scheme provided by the invention, the grouping method of the soft package battery module firstly connects the lugs of a plurality of battery monomers to form the battery connection group, and then folds the battery connection group, so that the battery monomers can be grouped without a wiring harness isolation plate, and the production efficiency is high. And moreover, a wiring harness isolation plate is omitted, so that the length of the soft package battery module is not limited by the length of the wiring harness isolation plate, and the soft package battery modules with different lengths can be produced conveniently.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the battery pack of fig. 1;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a battery connection pack according to an embodiment of the present invention;

fig. 5 is an exploded view illustrating hot pressing of the battery connection pack shown in fig. 4;

fig. 6 is a schematic perspective view of a pouch battery module formed by folding the battery connection pack shown in fig. 4;

fig. 7 is a sectional view of the pouch battery module shown in fig. 6;

fig. 8 is a schematic top view of a pouch battery module according to another embodiment of the present invention;

fig. 9 to 13 are schematic diagrams illustrating a grouping method of a pouch battery module according to another embodiment of the present invention;

fig. 14 to 17 are schematic diagrams illustrating a grouping method of a pouch battery module according to another embodiment of the present invention;

fig. 18 is a schematic structural view of another battery cell according to an embodiment of the present invention;

FIG. 19 is a schematic view of another alternative tab construction according to an embodiment of the present invention;

fig. 20 to 24 are schematic views illustrating a method of grouping the battery cells shown in fig. 18;

fig. 25 to 27 are schematic views illustrating another method of grouping the battery cells shown in fig. 18.

Each reference numeral represents:

1. a soft-package battery module;

11. a battery cell;

111. a negative tab; 112. a positive tab;

12. connecting sheets; 12A, a welding area;

121. interlayer connecting sheets; 1211. an end section; 1212. a middle section; 122. an end connecting sheet; 123. connecting sheets in the layers;

13. a first insulating film;

14. heating the film;

15. a circuit board;

16. a second insulating film;

2. an upper box body;

3. a lower box body;

10. a battery pack;

20. a vehicle main body;

x, a first direction;

y, a second direction;

z, the thickness direction of the battery monomer;

p, a battery connection group;

q, a battery stack layer;

I. a first pair of fold lines;

J. a second pair of fold lines.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

The embodiment of the invention provides equipment using a soft-package battery module 1 as a power supply, a battery pack 10, the soft-package battery module 1 and a grouping method of the soft-package battery module 1. Wherein, the equipment that uses laminate polymer battery module 1 as the power includes laminate polymer battery module 1 and is used for providing the drive arrangement of drive power for this equipment, and laminate polymer battery module 1 provides the electric energy to drive arrangement. The driving force of the equipment can be electric energy completely, or can be electric energy partially, and other energy sources partially. For example, the apparatus may also include a power source such as an engine to provide mechanical energy. The device using the pouch battery module 1 as a power source is within the scope of the present invention.

The equipment of the embodiment of the invention can be mobile equipment such as vehicles, ships, small airplanes and the like. Taking a vehicle as an example, the vehicle of the embodiment of the invention can be a new energy automobile. The new energy automobile can be a pure electric automobile, and also can be a hybrid electric automobile or a range-extended automobile. As shown in fig. 1, the vehicle includes a battery pack 10 and a vehicle main body 20, and the battery pack 10 is disposed in the vehicle main body 20 and includes at least one pouch battery module 1. The vehicle main body 20 is provided with a driving motor, the driving motor is electrically connected with the battery pack 10, the battery pack 10 provides electric energy for the driving motor, and the driving motor is connected with wheels on the vehicle main body 20 through a transmission mechanism so as to drive the vehicle to move. Specifically, the battery pack 10 may be horizontally disposed at the bottom of the vehicle body 20.

The battery pack 10 according to the embodiment of the present invention includes at least one pouch battery module 1. Specifically, in the present embodiment, as shown in fig. 2, the battery pack 10 of the present embodiment includes a plurality of pouch battery modules 1 and a case for accommodating the plurality of pouch battery modules 1. The box has and holds the chamber, and a plurality of laminate polymer battery module 1 arrange and arrange in holding the intracavity. The box of this embodiment is box-like box and including the lower box 3 that holds laminate polymer battery module 1 and the last box 2 that closes with lower box 3 lid. In other embodiments not shown in the figures, the box may also be in the shape of a frame, a disk, or the like.

In the present embodiment, as shown in fig. 3, the battery cell 11 includes a positive tab 111 and a negative tab 112, and in the present embodiment, the positive tab 111 and the negative tab 112 are both located at the same end of the battery cell 11. And the tab extends in a first direction X with respect to the battery cell 11, and a second direction Y is perpendicular to the first direction X.

As shown in fig. 4 and 5, a method for forming a soft package battery module 1 by grouping a plurality of battery cells 11 is that, specifically, the large faces of the plurality of battery cells 11 are laid flat and arranged in two rows in sequence; connecting the lugs of the battery single cells 11 by using the connecting sheets 12 so that the battery single cells 11 form a battery connecting group P together; the battery connection pack P is folded such that the plurality of battery cells 11 are stacked and arranged. The method of uniting of laminate polymer battery module 1 of this embodiment connects the utmost point ear of a plurality of battery monomer 11 earlier and forms battery connection group P and then folds battery connection group P thereby realize need not the pencil division board just can uniting battery monomer 11, production efficiency is high.

In other embodiments, the tabs of the plurality of battery cells 11 may be directly connected without using a connecting sheet.

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 package battery module 1 of the embodiment further includes attaching first insulating films 13 to both sides of the battery connection group P in the thickness direction Z of the battery cells 11 and folding the first insulating films 13 together with the battery connection group P. Specifically, the first insulating film 13 is wrapped around the battery connection group P by using a hot pressing technique. The battery cell 11 and the connecting sheet 12 of the embodiment are both provided with a first insulating film 13, and the first insulating film 13 connects the battery cell 11 and the connecting sheet 12 into a whole so as to facilitate folding. And the first insulating films 13 are 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 the present embodiment further includes sequentially laying a heating film 14 and a second insulating film 16 on the first insulating film 13, and folding the battery connection group P, the first insulating film 13, the heating film 14, and the second insulating film 16 together. The heating film 14 may be a heat conductive aluminum plate.

After the battery connection group P is wrapped, the wrapped battery connection group P is folded a plurality of times along a first pair of folding lines I in the first direction X as shown by respective arrows in fig. 4 to form the pouch battery module 1.

In the above-mentioned multiple folding, the two adjacent folds are opposite in direction. Specifically, the coated battery connection group P is bent in a serpentine shape by using a bending device.

As shown in fig. 6 and 7, the pouch battery module 1 formed by the grouping method of the present embodiment includes at least two battery stack layers Q stacked in the thickness direction Z of the battery cells 11 and a plurality of tabs 12, and the plurality of tabs 12 include interlayer tabs 121, and the interlayer tabs 121 are at least partially covered with an insulating material and have a bent structure to connect the battery cells 11 respectively on the two battery stack layers Q in the thickness direction Z. The laminate polymer battery module 1 of this embodiment utilizes and is connected the battery monomer 11 that is in respectively on two battery stack layers Q by the interlayer connection piece 121 of insulating material cladding, and need not the pencil division board among the prior art for laminate polymer battery module 1's of this embodiment length does not receive the length restriction of pencil division board, and the laminate polymer battery module 1 of consequently being convenient for produce different length.

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, wherein the middle section 1212 has an arc-shaped bent structure. The two end sections 1211 are connected to the battery cells 11 on the adjacent two battery stack layers Q, respectively. As shown in fig. 4, before grouping, the interlayer connecting sheet 121 of the present embodiment has a rectangular structure, and is folded during grouping so that the interlayer connecting sheet 121 has a bent structure in the grouped pouch battery module 1.

In this embodiment, the end section 1211 is of a planar configuration. The arrangement is such that the end section 1211 directly contacts the tab of the battery cell 11, thereby reducing the volume of the entire pouch battery module 1.

The interlayer connection sheet 121 of the present embodiment is at least partially covered with an insulating material to prevent a short circuit from occurring due to contact between two adjacent interlayer connection sheets 121 in the thickness direction Z of the battery cell 11, and specifically, as shown in fig. 7, at least partially refers to the outer side surface of the middle section 1212 of the interlayer connection sheet 121.

As shown in fig. 6 and 7, the plurality of connecting pieces 12 of the present embodiment further include an end connecting piece 122, the end connecting piece 122 is connected to the tabs of the battery cells 11 at the uppermost layer and the lowermost layer in the thickness direction Z and protrudes outside the pouch battery module 1, and the end connecting piece 122 forms an output end of the pouch battery module 1.

Specifically, the end connecting piece 122 of the present embodiment is a planar structure.

As shown in fig. 5, according to the grouping method of the pouch battery module 1 of the present embodiment, the first insulating films 13 are attached to two sides of the interlayer connecting sheet 121 and are bent along with the interlayer connecting sheet 121, specifically, the pouch battery module 1 of the present embodiment further includes the first insulating films 13 attached to two sides of the battery stack layer Q and the connecting sheet 12, respectively, and the first insulating films 13 include bent insulating films attached to the interlayer connecting sheet 121 and planar insulating films disposed on two sides of the bent insulating films and attached to the battery stack layer Q, and the bent insulating films are connected to the planar insulating films.

In this embodiment, the pouch battery module 1 further includes a heating film 14 attached to the first insulating film 13, and the heating film 14 includes a bending heating film attached to the bending insulating film and a planar heating film attached to the planar insulating film.

In this embodiment, the pouch battery module 1 further includes a second insulating film 16 attached to the heating film 14, and the second insulating film 16 includes a bent insulating film attached to the bent heating film and a planar insulating film attached to the planar heating film.

As shown in fig. 6, the size of the pouch battery module 1 in the thickness direction of the battery cell 11 is the height of the pouch battery module 1, the size in the first direction X is the length of the pouch battery module 1, and the size in the second direction Y is the width of the pouch battery module 1.

As shown in fig. 4, one battery cell 11 is disposed between the first pair of folding lines I of the adjacent two folds in the multiple folds of the present embodiment. The arrangement is such that each battery stack layer Q of the pouch battery module 1 of the present embodiment has one battery cell in the second direction Y. That is to say, in practical application, the number of the single batteries 1 between the first pair of folding lines I between two times of folding can be adjusted according to requirements, so as to adjust the width of the soft package battery module 1.

In the present embodiment, the plurality of battery cells 11 are laid flat and arranged in two rows, and as shown in fig. 6, each battery stack layer Q is formed to include two battery cells 11 arranged in the first direction X.

In another embodiment, when grouping, a plurality of battery cells 11 are placed flat and arranged in a row, and a pouch battery module 1 as shown in fig. 8 is formed, wherein each battery stack layer Q includes one battery cell 11.

In another embodiment, as shown in fig. 9, the large surfaces of the 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; connecting pieces 12 are overlapped between the tabs of the adjacent battery cells 11, the connecting pieces 12 are welded with the tabs of the battery cells 11, and one connecting piece 12 is welded with the tabs of the four adjacent battery cells 11. As shown in fig. 10, the first insulating films 13 are used to cover the upper and lower sides of the battery connection group P by using a hot pressing technique, so as to ensure the insulation between the connection pieces 12 after the group is formed, and at this time, the circuit of the whole module is completed. As shown in fig. 11, the tiled battery connection group P is finally folded along the first pair of folding lines I in the first direction X by an automated machine to obtain the stacked pouch battery module 1.

Specifically in the present embodiment, the battery connection group P is folded twice as shown by the arrow in fig. 11. And a plurality of battery cells 11 are arranged between the double folding lines. As shown in fig. 12 and 13, each battery stack layer Q of the pouch battery module 1 thus formed by folding includes a plurality of battery cells in the second direction Y. Therefore, the grouping method of the embodiment can adjust the number of folding times and the position of the folding line according to the requirement to adjust the number of the battery stacking layers Q of the pouch battery module 1 and the number of the battery cells 11 on each battery stacking layer Q, so as to stack the pouch battery modules 1 with different lengths and heights.

The connecting tab 12 of the embodiment of fig. 9 is also rectangular, but wider, than the connecting tab 12 of the embodiment of fig. 4. Therefore, in practical applications, the size of the connecting piece 12 can be adjusted according to practical requirements.

As shown in fig. 11 to 13, the plurality of connecting pieces 12 of the pouch battery module 1 of the present embodiment include an interlayer connecting piece 121, an end connecting piece 122, and an intra-layer connecting piece 123, wherein the interlayer connecting piece 121 is coated with an insulating material and has a bent structure to connect the battery cells 11 respectively located on the two battery stacking layers Q in the thickness direction Z; the end connecting sheet 122 is connected to the tabs of the battery cells 11 positioned at the uppermost layer and the lowermost layer in the thickness direction Z and extends out of the soft package battery module 1, and the end connecting sheet 122 forms the output end of the soft package battery module 1; the intra-layer connecting sheet 123 connects the tabs of the adjacent cells 11 in the second direction Y.

Preferably, the grouping method of the present embodiment further includes connecting a circuit board 15 on the battery connection group P, the circuit board 15 being electrically connected to the plurality of connection 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. In this embodiment, the circuit board 15 may be an FPC, a PCB, an FFC, or the like. The circuit board 15 is used for collecting 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, and can save the inner space of the battery modules after being grouped.

The circuit board 15 of the pouch battery module 1 formed by the grouping method of the present embodiment includes a circuit board plane section extending along the battery stack layer Q and a circuit board bent section disposed between two adjacent circuit board plane sections.

To achieve the integrated heating function, the grouping method of the present embodiment also includes laying the heating film 14 and the second insulating film 16 on the first insulating film 13 in this order, and folding the battery connection group P, the first insulating film 13, the circuit board 15, the heating film 14, and the second insulating film 16 together.

Specifically, the first insulating film 13 includes a bent insulating film attached to the interlayer connection tab 121 and planar insulating films disposed on both sides of the bent insulating film and attached to the battery stack layer Q and the interlayer connection tab 123, the bent insulating films connecting the planar insulating films.

Fig. 14-17 illustrate a grouping method of yet another embodiment of the present invention. The grouping method of the present embodiment includes equally dividing at least two battery cells 11 into at least two battery cell groups; flatly placing the large surfaces of the battery monomers 11 of each battery monomer group and sequentially arranging the large surfaces into at least one row; stacking each battery cell group in the thickness direction Z of the battery cells 11; and then the tabs of the battery cells 11 are connected by the connecting sheets 12.

Specifically, as shown in an enlarged structure of the portion M in fig. 16, a connecting sheet 12 is placed between two tabs on upper and lower layers of the battery cells 11 of two stacked battery cell groups and welded to achieve connection of the tabs.

The battery connection group P shown in fig. 14 and 15 is formed after the respective battery cells 11 are connected. The battery connection group P has a double-layer structure. This battery connection group P is then folded a plurality of times to form the pouch battery module 1 shown in fig. 17.

Similarly, the soft package battery module 1 includes at least two battery stacking layers Q stacked in the thickness direction Z of the battery cells 11 and a plurality of connecting sheets 12, the plurality of connecting sheets 12 includes an interlayer connecting sheet 121, and the interlayer connecting sheet 121 is covered by an insulating material and has a bending structure to connect the battery cells 11 respectively located on the two battery stacking 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 has an arc-shaped bent structure. The two end sections 1211 are connected to the battery cells 11 on the adjacent two battery stack layers Q, respectively.

In the present embodiment, the end section 1211 has a planar structure.

In other embodiments, as shown in fig. 18, the positive tab 112 and the negative tab 111 of the battery cell 11 of the present embodiment are respectively located at two ends of the battery cell 11. The extending direction of the tab with respect to the battery cell 11 is a 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 pouch battery module 1 will be described in detail with reference to fig. 19 to 27.

In one embodiment, as shown in fig. 20, a plurality of battery cells 11 are laid on a tool with a certain space between adjacent battery cells 11. The tabs of the battery cells 11 are then connected using the connecting tabs 12 of the U-shaped structure as shown in fig. 19 to form a battery connection pack P.

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

Similarly, the pouch battery module 1 of the present embodiment includes at least two battery stacking layers Q stacked in the thickness direction Z of the battery cells 11 and a plurality of connecting sheets 12, and the plurality of connecting sheets 12 include an interlayer connecting sheet 121, and the interlayer connecting sheet 121 is covered by an insulating material and has a bent structure to connect the battery cells 11 respectively located on the two battery stacking layers Q in the thickness direction Z.

Unlike other embodiments, the interlayer connecting sheet 121 of the present embodiment includes two end sections 1211 and a middle section 1212 connecting the two end sections 1211, wherein the middle section 1212 has an arc-shaped bent structure. The two end sections 1211 are connected to the battery cells 11 on the adjacent two battery stack layers Q, respectively. And end section 1211 is of arcuate bent configuration.

In another embodiment, as shown in fig. 25 and 26, a plurality of battery cells 11 are first laid on a tool. And then the tabs of the adjacent battery cells 11 are connected by the connecting sheets 12 to form a battery connecting group P. The battery connection group P is then folded a plurality of times along a first pair of folding lines I in the first direction X, and adjacent two folds of the plurality of folds are reversed in direction to form the pouch battery module 1 as shown in fig. 27.

Unlike the other embodiments, as shown in fig. 27, the two battery cells 11 in each battery stack layer Q of the pouch battery module 1 of the present embodiment are connected in parallel.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. The utility model provides a method of uniting of laminate polymer battery module, battery module (1) includes two at least battery monomer (11), battery monomer (11) are laminate polymer battery and have utmost point ear, its characterized in that includes:

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);

folding the battery connection group (P) to arrange the at least two battery cells (11) in a stacked arrangement.

2. The grouping method of the pouch battery module according to claim 1, wherein the connecting the tabs of at least two battery cells (11) comprises connecting the tabs of at least two battery cells (11) by using a connecting sheet (12).

3. The grouping method of the pouch battery module according to claim 2, wherein the connecting tab (12) is welded to the tab.

4. The grouping method of the pouch battery module according to claim 1, further comprising placing and arranging the large faces of the at least two battery cells (11) in at least one row in sequence before connecting the tabs of the at least two battery cells (11).

5. The grouping method of the pouch battery module according to claim 1, further comprising, before connecting tabs of the at least two battery cells (11), equally dividing the at least two battery cells (11) into at least two battery cell groups; flatly placing the large surfaces of the battery monomers (11) of each battery monomer group and sequentially arranging the large surfaces into at least one row; the battery cell groups are stacked in the thickness direction (Z) of the battery cell (11).

6. The grouping method of the pouch battery module according to claim 5, wherein the connecting the tabs of the at least two battery cells (11) comprises connecting the tabs of the battery cells (11) of the corresponding positions of the at least two battery cell groups.

7. The grouping method of pouch battery modules according to claim 1, wherein the tabs extend in a first direction (X) with respect to the battery cells (11), a second direction (Y) is perpendicular to the first direction (X), and folding the battery connection group (P) comprises folding the battery connection group (P) along a first pair of folding lines (I) in the first direction (X) and/or along a second pair of folding lines (J) in the second direction (Y).

8. The grouping method of pouch battery modules according to claim 7, wherein folding the battery connection group (P) comprises folding the battery connection group (P) at least twice along a first pair of folding lines (I) in the first direction (X); and/or the folding battery cell connection group (P) comprises at least two folds of the battery cell connection group (P) along a second pair of fold lines (J) in the second direction (Y).

9. The grouping method of the pouch battery module according to claim 8, wherein in the at least two folds, adjacent folds are opposite in direction.

10. The grouping method of the pouch battery module according to claim 8, wherein one battery cell (11) or at least two battery cells (11) are spaced between the folding lines of adjacent two folds in the at least two folds.

11. The grouping method of the pouch battery module according to any one of claims 1 to 10, further comprising attaching first insulating films (13) to both sides of the battery connection group (P) in the thickness direction (Z) of the battery cells (11) after the battery connection group (P) is formed and folding the first insulating films (13) together with the battery connection group (P).

12. The grouping method of the pouch battery modules according to claim 11, wherein the first insulating film (13) is wrapped on the battery connection group (P) using a hot pressing technique.

13. The grouping method of the pouch battery module according to claim 11, further comprising laying a heating film (14) on at least one of first insulating films (13) on both sides of the battery connection group (P) in the thickness direction (Z) of the battery cells (11), and folding the first insulating film (13), the heating film (14), and the battery connection group (P) together.

14. The grouping method of the pouch battery modules according to claim 13, further comprising attaching a second insulating film (16) to one side of the heating film (14), and folding the first insulating film (13), the heating film (14), the second insulating film (16), and the battery connection group (P) together.

15. The method for grouping pouch battery modules according to claim 11, further comprising attaching a circuit board (15) to the battery connection group (P) before attaching the first insulating film (13), wherein the first insulating film (13) is attached to the battery connection group (P) and the circuit board (15), and wherein the battery connection group (P), the first insulating film (13), and the circuit board (15) are folded together.

16. The utility model provides a laminate polymer battery module, its characterized in that includes and piles up layer (Q) and a plurality of connection piece (12) at the at least two batteries of range in the thickness direction (Z) of battery monomer (11), a plurality of connection pieces (12) are including layer connection piece (121) between, at least part is by insulating material cladding and for the structure of buckling in layer connection in thickness direction (Z) is in battery monomer (11) on two battery pile layers (Q) respectively.

17. The laminate battery module according to claim 16, wherein the interlayer connecting sheet (121) comprises two end sections (1211) and a middle section (1212) connecting the two end sections (1211), and the middle section (1212) is of an arc-shaped bent structure.

18. The pouch battery module according to claim 17, characterized in that the end section (1211) is of a planar structure; alternatively, the end section (1211) is of an arc-shaped bent structure.

19. The laminate polymer battery module of claim 16, wherein the connecting plates (12) further comprise an end connecting plate (122), the end connecting plate (122) is connected to a tab of the battery cell (11) at the uppermost layer or the lowermost layer in the thickness direction (Z) and extends out of the laminate polymer battery module (1), and the end connecting plate (122) forms an output end of the laminate polymer battery module (1).

20. The pouch cell module according to claim 19, wherein the end connection tabs (122) are of planar construction.

21. The pouch battery module according to claim 16, wherein each battery stack layer (Q) comprises one battery cell (11) or more than two battery cells (11).

22. The soft package battery module according to claim 16, wherein the soft package battery module (1) further comprises first insulating films (13) respectively attached to two sides of the battery stacking layer (Q) and the connecting sheet (12), the connecting sheet (12) further comprises an inner connecting sheet (123), the inner connecting sheet (123) is connected with the tabs of the adjacent single batteries (11) on the battery stacking layer (Q), the first insulating film (13) comprises bent insulating films attached to the interlayer connecting sheet (121) and planar insulating films arranged on two sides of the bent insulating films and attached to the battery stacking layer (Q) and the inner connecting sheet (123), and the bent insulating films are connected with the planar insulating films.

23. The laminate battery module as recited in claim 22, wherein the laminate battery module (1) further comprises a heating film (14) attached to the first insulating film (13), and the heating film (14) comprises a bending heating film attached to the bending insulating film and a plane heating film attached to the plane insulating film.

24. The laminate battery module as recited in claim 23, wherein the laminate battery module (1) further comprises a second insulating film (16) attached to the heating film (14), and the second insulating film (16) comprises a bent insulating film attached to the bent heating film and a planar insulating film attached to the planar heating film.

25. The pouch battery module according to claim 16, wherein the pouch battery module (1) further comprises a circuit board (15) electrically connected with the connecting sheet (12), and the circuit board (15) comprises a circuit board plane section extending along the battery stacking layer (Q) and a circuit board bending section arranged between two adjacent circuit board plane sections.

26. A battery pack, comprising a box body and the soft package battery module according to any one of claims 16 to 25, wherein the soft package battery module is accommodated in the box body.

27. An apparatus using a pouch battery module as a power source, comprising a driving device for providing a driving force for the apparatus and the pouch battery module according to any one of claims 16 to 25, the battery module being configured to provide electric power to the driving device.