CN211828937U

CN211828937U - Folding battery pack and vehicle

Info

Publication number: CN211828937U
Application number: CN202020714259.3U
Authority: CN
Inventors: 杨重科; 冯帅; 赵亮; 李成亮; 翁志福
Original assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Current assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-10-30
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses a folding group battery. According to the utility model discloses an embodiment, this folding group battery includes: the flexible-package battery cell laminate comprises a plurality of layers of flexible-package battery cells, each layer of the flexible-package battery cell comprises a plurality of battery cell monomers, each battery cell monomer comprises a positive plate, a positive tab, a negative plate and a negative tab, and the battery cell monomers are connected in series; the two adjacent layers of the soft-package battery cell are provided with a bent part, and the bent part is formed by bending the connecting part of the two adjacent battery cell monomers; and the fixed plates are arranged on two sides of the folding battery pack and are respectively arranged on the outer sides of the first layer of soft package battery cell and the last layer of soft package battery cell. This folding group battery is made by the folding of the soft packet of electricity core of a plurality of series connections, and attachment is few, the equipment is convenient, and the performance is better.

Description

Folding battery pack and vehicle

Technical Field

The utility model relates to a new energy automobile field, particularly, the utility model relates to a folding group battery and vehicle.

Background

With the continuous popularization of new energy automobiles, the use requirements of power batteries in the new energy automobiles become higher and higher. Particularly, the requirement of a user on the continuous mileage of the new energy automobile is continuously improved, and the power battery pack of the common new energy automobile exceeds 1m in both the length direction and the width direction; however, in the current market, the length of the battery module is generally about 0.3m, so at least three or even more battery modules need to be arranged in the power battery pack.

The arrangement of a plurality of battery modules requires a fixing structure to be added to each battery module, and the assembly is complicated. Meanwhile, two adjacent battery modules need to be in power connection through an external power connecting piece. The battery module mounting structure is large, which not only increases the cost, but also increases the overall weight; simultaneously, in single module volume, mounting structure has taken more inner space, causes power battery module, and battery package whole capacity reduces, and battery module sets up more in the battery package, and the space is extravagant just more. In addition, because a plurality of external power connecting pieces are needed to be arranged for power connection, the internal resistance and the cost are increased, and the internal consumption and the cost of the power battery pack in use are improved.

In summary, the existing new energy automobile battery pack still needs to be improved.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, it is an object of the present invention to provide a folding battery pack and a vehicle. This folding group battery is made by the folding of the soft packet of electricity core of a plurality of series connections, and attachment is few, the equipment is convenient, and the performance is better.

In one aspect of the present invention, the utility model provides a folding battery pack. According to the utility model discloses an embodiment, this folding group battery includes: the flexible-package battery cell laminate comprises a plurality of layers of flexible-package battery cells, each layer of the flexible-package battery cell comprises a plurality of battery cell monomers, each battery cell monomer comprises a positive plate, a positive tab, a negative plate and a negative tab, and the battery cell monomers are connected in series; the two adjacent layers of the soft-package battery cell are provided with a bent part, and the bent part is formed by bending the connecting part of the two adjacent battery cell monomers; and the fixed plates are arranged on two sides of the folding battery pack and are respectively arranged on the outer sides of the first layer of soft package battery cell and the last layer of soft package battery cell.

According to the embodiment of the utility model, in the folding battery pack, a plurality of single battery cells are connected in series, and the connecting parts of two single battery cells are bent to form a soft-package battery cell laminated structure; through setting up the fixed plate, can fix multilayer soft-packaged electrical core, further improve the structural stability of multilayer soft-packaged electrical core. Therefore, the folding battery pack has few connecting accessories and convenient assembly, and can be directly assembled in series along with the offline of the single battery cell. This folding group battery accessible reduces the series-parallel connection copper bar and the outside mounting structure between the pile body, reduces the module and organizes the annex, and reduce cost and weight improve space utilization, and then can hold more utmost point groups at the battery package, promote vehicle continuation of the journey mileage. Meanwhile, the use of external power connecting pieces between modules is reduced, bolt connection between modules is avoided, the connection stability and reliability of the power connecting pieces do not need to be considered, the connection internal resistance is reduced, and further the internal consumption of the power battery pack in use is reduced.

Optionally, a plurality of fixing holes are distributed on the side surface of the fixing plate.

Optionally, a structural adhesive is arranged between every two adjacent battery cell monomers on different layers, and a structural adhesive is arranged between the fixing plate and the soft-package battery cell.

Optionally, the thickness of the structural adhesive is 0.05-0.2 mm.

Optionally, the thickness of the structural adhesive is 0.1-0.18 mm.

Optionally, the structural adhesive has a strength of not less than 0.1 MPa.

Optionally, the battery cell units are connected in series by laser welding, ultrasonic welding or riveting.

Optionally, the length of the folded battery pack is not less than 600 mm.

Optionally, the folded battery further comprises: the buffering bubble is cotton, the buffering bubble is cotton to be established adjacent two-layer between the soft-packaged electrical core, with the fixed plate with between the soft-packaged electrical core, the buffering bubble cotton with it glues to be equipped with the structure between the fixed plate.

Optionally, the total thickness of the buffer foam is 5-20% of the total thickness of the soft package cell laminated body.

In another aspect of the present invention, the utility model provides a vehicle. According to the utility model discloses an embodiment, this vehicle includes the folding group battery of above-mentioned embodiment. Thus, the vehicle has all of the features and advantages previously described for the folded battery pack and will not be described in detail herein. In general, the vehicle has better reliability and endurance mileage.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a folded battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a folding battery pack according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a fixing plate in a folding battery pack according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a cell unit in a folding battery pack according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a plurality of battery cells connected in series in a folded battery pack according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a plurality of battery cells connected in series in a folded battery pack according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 6;

fig. 8 is a schematic structural diagram of a plurality of battery cells connected in series and a folding tool in a folding battery pack according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of buffering foam in the folding battery pack according to the embodiment of the present invention.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one aspect of the present invention, the utility model provides a folding battery pack. Referring to fig. 1-5, according to the utility model discloses an embodiment, this folding group battery includes: the soft-package battery cell laminate comprises a plurality of layers of soft-package battery cells, each layer of soft-package battery cell comprises a plurality of battery cell monomers 100, each battery cell monomer comprises a positive plate, a positive tab 110, a negative plate and a negative tab 120, and all the battery cell monomers 100 are connected in series; wherein, adjacent two-layer soft-packaged electrical core has a kink 200, and kink 200 is buckled by the connection position of two adjacent electric core monomers 100 and is formed. Fixed plate 400, fixed plate 400 are established in the both sides of folding group battery to install respectively in the first layer laminate polymer core and the last layer laminate polymer core outside.

The folding battery pack according to an embodiment of the present invention is further described in detail below with reference to fig. 1 to 9.

Fig. 1 and 2 show a schematic structural diagram of a folding battery pack according to an embodiment of the present invention. In this folding battery pack, each layer of soft-packaged battery cell includes three battery cell monomers 100. In each layer of soft-package battery cell, the positive electrode tab and the negative electrode tab of two adjacent battery cell monomers 100 are connected, so that the battery cell monomers 100 are connected in series; the fixed plates 400 are disposed on both sides of the foldable battery pack and are respectively mounted on the outer sides of the first layer of soft-package battery cell and the last layer of soft-package battery cell.

Referring to fig. 3, according to some embodiments of the present invention, a plurality of fixing holes 410 are further disposed on the side surface of the fixing plate 400. The folded battery pack may be mounted and fixed in the battery system using the fixing holes 410.

According to the utility model discloses a some embodiments are located to be equipped with the structure between two adjacent electric core monomers on different layers and glue, are equipped with the structure between fixed plate and the soft-packaged electric core and glue. From this, can further improve the structural stability between the adjacent two-layer soft-packaged electrical core to and the structural stability between both sides fixed plate and the adjacent soft-packaged electrical core. And, bond two adjacent layer soft-packaged electric core through the structure is glued, can not cause too big influence to the volume of group battery.

According to some embodiments of the utility model, the thickness that above-mentioned structure was glued can be 0.05 ~ 0.2mm, for example 0.05mm, 0.1mm, 0.15mm, 0.2mm etc. From this, can further improve the structural stability between the two-layer soft packet of electricity core of adjacent.

According to some embodiments of the present invention, the strength of the structural adhesive is not less than 0.1MPa, for example, 0.1MPa, 0.2MPa, 0.5MPa, 1MPa, 2MPa, etc.

The utility model discloses an among the folding group battery, electric core monomer can adopt the common soft-packaged electric core in this field. Referring to fig. 4, the battery cell 100 includes a positive tab, a positive tab 110, a negative tab, and a negative tab 120. And the outside of the battery cell monomer is also wrapped with a packaging structure, such as an aluminum plastic film and the like.

The schematic structural diagrams of a plurality of series-connected battery cell units 100 that are not folded are shown in fig. 5 to 7. As shown in fig. 5 to 7, the positive electrode tab and the negative electrode tab of two adjacent battery cell monomers 100 are connected to realize series connection. Furthermore, the joint of the positive electrode lug and the negative electrode lug of the two adjacent battery cell monomers can be bent according to actual needs, so that the stacking is completed. Specifically, referring to fig. 8, the bending operation may be performed by the upper tool 310 and the lower tool 320.

According to some embodiments of the utility model, through laser welding, ultrasonic bonding or riveting series connection between each electric core monomer. The positive and negative electrode lugs of the two single battery cells are connected in the connection mode, and the joint part obtained by connection is easy to bend.

According to some embodiments of the utility model, the utility model discloses a length of folding group battery is not less than 600 mm. The utility model discloses a folding group battery is connected and is folded by a plurality of electric core monomers and form, selects specific folding position according to actual need, adjusts the length of folding group battery very easily. The length of the folding battery pack is not less than 600mm, and the adaptation requirement of the common new energy automobile battery pack can be met.

According to some embodiments of the utility model, the utility model discloses a folding group battery further includes: and (5) buffering foam. The buffering bubble is cotton to be established between adjacent two-layer soft-packaged electrical core, is equipped with the structure between buffering bubble cotton and the soft-packaged electrical core and glues. From this, utilize the buffering bubble cotton both can provide fixed pretightning force for the equipment of group battery initial stage, also can use the later stage to absorb electric core bulging force at the group battery. The structure of the cushion foam is shown in fig. 9.

According to the utility model discloses a some embodiments, the cotton gross thickness of above-mentioned buffering bubble can be 5 ~ 20% of soft-packaged electrical core laminate gross thickness. Thus, it is possible to provide the battery pack with appropriate cushioning without excessively increasing the volume of the battery pack.

In summary, the foldable battery pack according to the embodiment of the present invention has at least one of the following advantages:

1. the folding battery pack is internally connected, and has no conductive additional structures such as copper bars, aluminum bars and the like, so that the cost is low and the connection is quick;

2. after the electric core in the folding battery pack is taken off line in an electric core production workshop, the electric core can be directly welded along with a flow line, and after welding, the electric core is bent at different electric core positions according to system requirements, so that overlapping is realized, and the assembly efficiency is high;

3. the lugs are directly connected, so that connecting accessories are reduced, the cost is reduced, and the connecting reliability is improved;

4. compared with the traditional battery module in which each module is fixed and connected by four bolts, the battery module has the advantages that the bolts and the times for fixing each module are reduced, and the production efficiency is greatly improved;

5. compare in the traditional battery module that needs four bolt fastening, the folding group battery of the electric core of the same quantity need not reserve the space that is used for installation, module inflation, external connection, can increase substantially the volume utilization ratio of folding group in battery system.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A folding battery, comprising:

the flexible-package battery cell laminate comprises a plurality of layers of flexible-package battery cells, each layer of the flexible-package battery cell comprises a plurality of battery cell monomers, each battery cell monomer comprises a positive plate, a positive tab, a negative plate and a negative tab, and the battery cell monomers are connected in series; the two adjacent layers of the soft-package battery cell are provided with a bent part, and the bent part is formed by bending the connecting part of the two adjacent battery cell monomers;

and the fixed plates are arranged on two sides of the folding battery pack and are respectively arranged on the outer sides of the first layer of soft package battery cell and the last layer of soft package battery cell.

2. The folding battery as claimed in claim 1, wherein a plurality of fixing holes are distributed on the side of the fixing plate.

3. The foldable battery pack according to claim 1, wherein a structural adhesive is arranged between two adjacent cell monomers in different layers, and a structural adhesive is arranged between the fixing plate and the soft package cell.

4. The folded battery pack according to claim 3, wherein the thickness of the structural adhesive is 0.05-0.2 mm.

5. The folded battery as claimed in claim 1, wherein the length of the folded battery is not less than 600 mm.

6. The folding battery pack of claim 1, further comprising:

the buffering bubble is cotton, the buffering bubble is cotton to be established adjacent two-layer between the soft-packaged electrical core, with the fixed plate with between the soft-packaged electrical core, the buffering bubble cotton with it glues to be equipped with the structure between the fixed plate.

7. The folded battery pack according to claim 6, wherein the total thickness of the buffer foam is 5-20% of the total thickness of the soft pouch cell laminate.

8. A vehicle, characterized by comprising: the folded battery pack according to any one of claims 1 to 7.