CN216085051U

CN216085051U - Soft-package battery and battery package

Info

Publication number: CN216085051U
Application number: CN202121759566.4U
Authority: CN
Inventors: 陈金雲; 洪丽; 龚静君; 计结胜
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-03-18
Anticipated expiration: 2031-07-29

Abstract

The utility model provides a soft-package battery and a battery pack, wherein the soft-package battery comprises: the packaging shell is internally provided with a first cavity and a second cavity communicated with the first cavity; the naked electric core is accommodated in the first accommodating cavity; and the liquid storage block is used for storing electrolyte and is accommodated in the second accommodating cavity. According to the soft package battery and the battery pack provided by the utility model, the liquid storage block is accommodated in the second accommodating cavity, the liquid storage block can store electrolyte, when the electrolyte in the first accommodating cavity is consumed, the electrolyte can be supplemented into the first accommodating cavity by the liquid storage block, the cycle performance of the soft package battery is ensured, and the service lives of the soft package battery and the battery pack are prolonged.

Description

Soft-package battery and battery package

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a soft package battery and a battery pack.

Background

The soft package lithium ion battery generally comprises a laminated body and an aluminum-plastic film, wherein the laminated body is formed by stacking a negative plate, a diaphragm and a positive plate, a punching pit is formed in the aluminum-plastic film, the laminated body is placed in the punching pit firstly during packaging, then a current collector and an external tab are connected together through ultrasonic welding, and finally a battery core is packaged by using a high-temperature metal end enclosure.

The aluminum-plastic film is thin in overall thickness and soft in texture, and the addition amount of the electrolyte is estimated according to the porosity and the expansion performance of various materials in the cell design process. Too much electrolyte can cause the cell to be softer and the surface to swell. If too little electrolyte is added, the long-term cycle performance of the battery cell is affected.

The aluminum-plastic film may generally include a nylon layer, a dense aluminum layer, and a pp (polypropylene) layer or cpp (cast polypropylene film) layer, with adjacent layers being bonded together by an adhesive layer. The nylon layer protects the middle aluminum layer from being scratched and prevents the battery from being impacted by falling and the like. The compact aluminum layer can prevent water vapor from permeating into the battery core, and the service life and even the safety performance of the battery core are influenced. The pp layer (or cpp layer) has better thermal bonding property with metal and a tab rubber block, and is resistant to electrolyte corrosion, and in addition, the hot-melt bonding of the pp layer (or cpp layer) is mainly utilized in the hot-sealing process.

Three-edge sealing in the soft package lithium ion battery packaging process is a common packaging mode, namely, the aluminum plastic film is folded in half and then two top edges and one side edge of the aluminum plastic film are heat-sealed by a high-temperature metal end socket. Once the soft package lithium ion battery is packaged well, electrolyte cannot be supplied to the battery core, and the electrolyte is consumed in a large amount at the later stage of the battery core circulation, so that the positive and negative pole pieces cannot be completely soaked in the electrolyte, the charge-discharge internal resistance of the battery is increased, and the circulation performance is influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model aims to provide a soft package battery, and the soft package battery is used for solving the technical problem that in the prior art, a large amount of electrolyte is consumed in the later cycle period of the soft package lithium ion battery, so that the cycle performance is influenced.

In order to achieve the purpose, the utility model adopts the technical scheme that: there is provided a package comprising:

the packaging shell is internally provided with a first cavity and a second cavity communicated with the first cavity;

the naked electric core is accommodated in the first accommodating cavity; and the number of the first and second groups,

and the liquid storage block is used for storing electrolyte and is accommodated in the second accommodating cavity.

Through adopting the second to hold the storage liquid piece that fills in the chamber, can be when the naked electric core of packaging shell encapsulation, through storage liquid piece storage electrolyte, like this in laminate polymer battery recycling use, when first appearance intracavity electrolyte consumed, the storage liquid piece can release electrolyte, the electrolyte of storage liquid piece release can be held the chamber by the second and flow into first appearance chamber in, with the first electrolyte that holds in the chamber of supplementary, ensure that first appearance chamber in positive pole piece and negative pole piece are fully soaked by electrolyte, avoid first appearance chamber in electrolyte consumption, positive pole piece and negative pole piece soak inadequately, lead to laminate polymer battery internal resistance increase, guarantee laminate polymer battery's cyclicity performance, improve laminate polymer battery's life.

In one embodiment, the package casing includes a first casing and a second casing covering the first casing, the first casing is provided with a first groove and a first strip-shaped groove, the second casing and the first groove of the first casing enclose to form a first containing cavity, and the second casing and the first strip-shaped groove of the first casing enclose to form a second containing cavity.

Through adopting above-mentioned technical scheme, can fix a position naked electric core of holding and liquid storage piece.

In one embodiment, the second shell is provided with a second groove, and the second groove and the first groove enclose to form a first cavity; and/or the second casing is provided with a second strip-shaped groove, and the first strip-shaped groove and the second strip-shaped groove are encircled to form a second containing cavity.

Through adopting above-mentioned technical scheme, can constitute first appearance chamber and second and hold the chamber.

In one embodiment, the second housing is flat.

Through adopting above-mentioned technical scheme, can be convenient for the encapsulation of first casing and second casing.

In one embodiment, the package casing includes a first casing and a second casing covering the first casing, a first groove is formed in the first casing, the second casing and the first groove of the first casing enclose to form a first cavity, a second strip-shaped groove is formed in the second casing, and the second strip-shaped groove of the first casing and the second casing enclose to form a second cavity.

In one embodiment, a flow passage communicating the first cavity with the second cavity is formed in the packaging shell; the height of the flow passage is less than that of the second cavity.

By adopting the technical scheme, the electrolyte can be allowed to flow into the first containing cavity from the second containing cavity.

In one embodiment, the ratio of the height of the second volume to the height of the first volume is in the range 0.35 to 0.95 and/or the ratio of the height of the second volume to the height of the flow passage is in the range 0.05 to 0.34.

Through adopting above-mentioned technical scheme, can control the volume that adds electrolyte to guarantee laminate polymer battery's outward appearance.

In one embodiment, the bare cell is a laminated cell.

By adopting the technical scheme, the energy density and the safety performance of the soft package battery can be improved.

In one embodiment, a sealing edge is arranged on one side of the packaging shell close to the second cavity, and the sealing edge is bent to form a folding edge structure.

Through adopting above-mentioned technical scheme, can strengthen the sealed effect of encapsulation shell.

In one embodiment, the height of the second cavity is smaller than that of the first cavity, so that a step structure is formed between the first cavity and the second cavity; the hem structure is accomodate on the stair structure.

Through adopting above-mentioned technical scheme, the laminate polymer battery's of being convenient for heat dissipation.

In one embodiment, the reservoir block is a lipid gel block.

By adopting the technical scheme, the electrolyte can be absorbed and stored conveniently.

The embodiment of the utility model also provides a battery pack, which comprises a box body and the soft-package battery in any embodiment, wherein the soft-package battery is arranged in the box body.

By adopting the technical scheme, the service life of the battery pack is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pouch battery provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 2;

fig. 4 is a schematic structural diagram of an unpackaged package according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a package case according to another embodiment of the utility model when the package case is not packaged.

Wherein, in the figures, the respective reference numerals:

10-a package housing; 101-a first volume; 102-a second cavity; 103-a flow channel; 11-a first housing; 111-a first recess; 112-a first bar-shaped groove; 12-a second housing; 121-a second groove; 122-a second strip groove; 13-edge sealing; 130-a hem structure; 14-a step structure;

20-bare cell;

30-liquid storage block.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It is to be understood that the terms "length," "width," "upper," "lower," "top," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to 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 one or more of that feature.

Referring to fig. 1, fig. 2 and fig. 3 together, a pouch battery according to an embodiment of the present invention will now be described. Laminate polymer battery includes packaging shell 10, naked electric core 20 and stock solution piece 30, has seted up first appearance 101 and second in packaging shell 10 and has held chamber 102, and second holds chamber 102 and is linked together with first appearance 101, and naked electric core 20 holding is in first appearance 101, and stock solution piece 30 is used for saving electrolyte, and stock solution piece 30 holding is in second appearance chamber 102, and stock solution piece 30 can release electrolyte when first appearance 101 middle electrolyte consumes.

In this embodiment, through adopting the second to hold and fill liquid storage block 30 in the chamber 102, can be when the naked electric core 20 of packaging shell 10 encapsulation, through liquid storage block 30 storage electrolyte, like this in laminate polymer battery recycling process, when first appearance intracavity 101 electrolyte consumes, liquid storage block 30 can release electrolyte, the electrolyte that liquid storage block 30 released can be held the chamber 102 by the second and flowed into first appearance chamber 101, in order to supply the electrolyte in first appearance chamber 101, ensure that positive pole piece and negative pole piece are fully soaked by electrolyte in first appearance chamber 101, avoid the electrolyte consumption in first appearance chamber 101, positive pole piece and negative pole piece soak inadequately, lead to laminate polymer battery internal resistance to increase, guarantee laminate polymer battery's cyclicity performance, improve laminate polymer battery's life. Moreover, the second accommodating cavity 102 is used for accommodating the liquid storage block 30, and the electrolyte is stored through the liquid storage block 30, so that the situation that the soft package battery is too soft due to too much electrolyte capacity in the first accommodating cavity 101 can be avoided, and the appearance quality of the soft package battery is guaranteed. Further, because the liquid storage block 30 can release electrolyte, supply the electrolyte in the first chamber 101 that holds, improve the circulation of electrolyte, promote the thermal scattering and disappearing of laminate polymer battery, be favorable to ensuring laminate polymer battery's radiating efficiency.

In an embodiment of the present invention, referring to fig. 2 and fig. 3, the package case 10 includes a first case 11 and a second case 12, the second case 12 is covered with the first case 11, the first case 11 is provided with a first groove 111 and a first bar-shaped groove 112, when the first case 11 and the second case 12 are packaged, the second case 12 and the first groove 111 of the first case 11 enclose to form a first cavity 101, and the second case 12 and the first bar-shaped groove 112 of the first case 11 enclose to form a second cavity 102. When the naked electric core 20 of packaging shell 10 encapsulation, naked electric core 20 of holding can be fixed a position to first recess 111 to in the first appearance chamber 101 that forms bare electric core 20 encapsulation, first bar-shaped groove 112 can fill stock solution piece 30, so that in the second appearance chamber 102 that forms the stock solution piece 30 encapsulation.

In an embodiment, referring to fig. 2 to 4, a second groove 121 and a second strip groove 122 are formed on the second housing 12, the second groove 121 is located on the second housing 12 corresponding to the first groove 111, the second strip groove 122 is located on the second housing 12 corresponding to the first strip groove 112, after the first housing 11 and the second housing 12 are packaged, the first groove 111 and the second groove 121 enclose to form a first cavity 101, and the first strip groove 112 and the second strip groove 122 enclose to form a second cavity 102. After the first casing 11 and the second casing 12 are covered and packaged, the first groove 111 and the second groove 121 can be buckled to form a first cavity 101 to position and contain the bare cell 20, the bare cell 20 is packaged in the formed first cavity 101, the first strip-shaped groove 112 and the second strip-shaped groove 122 are buckled to form a second cavity 102 to position and contain the liquid storage block 30, and the liquid storage block 30 is packaged in the formed second cavity 102. Moreover, the depth of the first groove 111 and the depth of the second groove 121 share the height of the first cavity 101, and the depth of the first strip-shaped groove 112 and the depth of the second strip-shaped groove 122 share the height of the second cavity 102, so that the depths of the first groove 111 and the second groove 121 are shallow, and the depths of the first strip-shaped groove 112 and the second strip-shaped groove 122 are shallow, which is convenient for processing, is beneficial to controlling the stability of the appearance of the package case 10, and ensures the appearance quality of the package case 10. Of course, in other embodiments, the second housing 12 may be provided with a second groove 121, and the second receiving cavity 102 is formed by the first strip-shaped groove 112 and a planar area of the second housing 12 corresponding to the first strip-shaped groove 112; or, the second casing 12 is provided with a second strip-shaped groove 122, and the first cavity 101 is defined by the first groove 111 and a planar area of the second casing 12 corresponding to the first groove 111.

In another embodiment, referring to fig. 1 and fig. 5, the second housing 12 is shaped like a flat plate, a position of the second housing 12 corresponding to the first groove 111 is a plane, and a position of the second housing 12 corresponding to the first bar-shaped groove 112 is a plane. Therefore, a first cavity 101 is defined by the inner wall of the first groove 111 and the plane of the second shell 12 close to the first shell 11 to accommodate the bare cell 20, and a second cavity 102 is defined by the inner wall of the first strip-shaped groove 112 and the plane of the second shell 12 close to the first shell 11 to accommodate the liquid storage block 30. Therefore, when the second housing 12 and the first housing 11 are aligned in a packaging manner, the alignment accuracy of the first groove 111 and the first bar-shaped groove 112 on the second housing 12 and the first housing 11 does not need to be considered, and the first housing 11 and the second housing 12 can be conveniently packaged. Certainly, in other embodiments of the present invention, the position of the second casing 12 corresponding to the first groove 111 is in a flat plate shape, the second casing 12 is provided with a second strip-shaped groove 122, the plane of the second casing 12 close to the first groove 111 and the first groove 111 enclose a first cavity 101, and the second strip-shaped groove 122 and the first strip-shaped groove 112 enclose a second cavity 102; or the position of the second casing 12 corresponding to the first bar-shaped groove 112 is flat, the second casing 12 is provided with a second groove 121, the second groove 121 and the first groove 111 enclose to form a first cavity 101, and the plane of the second casing 12 close to the first bar-shaped groove 112 and the first bar-shaped groove 112 enclose to form a second cavity 102.

In another embodiment of the present invention, the enclosure 10 includes a first housing 11 and a second housing 12, the second housing 12 is covered with the first housing 11, the first housing 11 is provided with a first groove 111, the second housing 12 is provided with a second strip-shaped groove 122, after the first housing 11 and the second housing 12 are enclosed, the second housing 12 and the first groove 111 of the first housing 11 enclose a first cavity 101, and the first housing 11 and the second strip-shaped groove 122 of the second housing 12 enclose a second cavity 102. When naked electric core 20 of packaging shell 10 encapsulation, naked electric core 20 of holding can be fixed a position to first recess 111 to in the first appearance chamber 101 that forms bare electric core 20 encapsulation, second recess 121 can fill stock solution piece 30, in order to encapsulate stock solution piece 30 in the second appearance chamber 102 that forms.

Optionally, after the first housing 11 and the second housing 12 are packaged, a planar area of the second housing 12 corresponding to the first groove 111 and the first groove 111 enclose to form a first cavity 101, and a planar area of the first housing 11 corresponding to the second strip-shaped groove 122 and the second strip-shaped groove 122 enclose to form a second cavity 102. The portion of the enclosure 10 corresponding to the second cavity 102 may be folded toward the side near the first groove 111, and the width of the second strip-shaped groove 122 is controlled to be smaller than the thickness of the first cavity 101, so as to prevent the second cavity 102 from occupying the thickness dimension of the enclosure 10.

In an embodiment of the present invention, referring to fig. 2 and fig. 3, a flow channel 103 is formed on the package housing 10, and the flow channel 103 communicates the first cavity 101 and the second cavity 102. The height of the flow passage 103 is smaller than the height of the second cavity 102. So on the one hand can form a plurality of angles of bending on the packaging shell 10, be favorable to increasing the structural strength of packaging shell 10, guarantee packaging shell 10's stability, on the other hand can reduce the cross-sectional area of runner 103 to ensure the stability of liquid storage block 30 position in second appearance chamber 102, prevent that liquid storage block 30 from getting into first appearance chamber 101, be favorable to ensuring the even release of liquid storage block 30 electrolyte, guarantee laminate polymer battery's appearance quality. The height direction of the flow channel 103 and the height direction of the second cavity 102 are the thickness direction of the bare cell 20.

In an embodiment, referring to fig. 2 and fig. 3, a first connecting groove (not shown) is formed on the first housing 11, the first connecting groove is located between the first groove 111 and the first bar-shaped groove 112, the first connecting groove connects the first groove 111 and the first bar-shaped groove 112, and the first housing 11 and the second housing 12 enclose the flow channel 103 at a position corresponding to the first connecting groove. The depth of the first coupling groove is smaller than the depth of the first bar-shaped groove 112. Thus, the liquid storage block 30 can be blocked by the stepped surface formed between the first connecting groove and the first bar-shaped groove 112, so that the position of the liquid storage block 30 can be stabilized.

In an embodiment, referring to fig. 2 and fig. 3, the second shell 12 is provided with a second connecting groove (not shown), the second connecting groove is located on the second shell 12 corresponding to the first connecting groove, and the first connecting groove and the second connecting groove form a flow channel 103. Therefore, through the first connecting groove and the second connecting groove, the structural strength of the first shell 11 and the second shell 12 can be enhanced, and the stability of the liquid storage block 30 in the second accommodating cavity 102 can be guaranteed. Of course, in another embodiment of the present invention, the second housing 12 may be in a flat plate shape, and the position of the second housing 12 corresponding to the second connecting groove may also be a flat surface, so that when the second housing 12 is aligned with the first housing 11, the alignment accuracy of the second housing 12 and the first connecting groove on the first housing 11 does not need to be considered, and the first housing 11 and the second housing 12 are conveniently packaged.

In an embodiment of the present invention, referring to fig. 4 and 5, the first housing 11 and the second housing 12 may be formed by bending a plate, so as to facilitate the packaging of the package 10 by a three-sided sealing method. Of course, in other embodiments of the present invention, the first housing 11 and the second housing 12 may be formed by two separate plates, which are fastened together by alignment, and then thermally sealed.

In one embodiment of the utility model, the ratio of the height of the second cavity 102 to the height of the first cavity 101 is in the range 0.35-0.95. This can ensure that the liquid storage block 30 has a sufficient height to ensure a capacity for absorbing the stored electrolyte. Alternatively, the ratio of the height of second cavity 102 to the height of first cavity 101 may be 0.4, 0.5, 0.6, 0.7, or 0.8, and the ratio of the height of second cavity 102 to the height of first cavity 101 may be adjusted according to the addition amount of the electrolyte. Wherein, the direction of height of first appearance chamber 101 is the thickness direction of naked electric core 20.

In one embodiment of the present invention, the ratio of the height of the flow channel 103 to the height of the second cavity 102 ranges from 0.05 to 0.34. Can ensure the circulation efficiency of electrolyte like this to when the guarantee electrolyte consumes in first appearance chamber 101, can obtain in time replenishing, and guarantee that first appearance chamber 101 is interior even appropriate amount of electrolyte, in order to avoid laminate polymer battery to warp. Alternatively, the ratio of the height of the flow channel 103 to the height of the second cavity 102 may be 0.1, 0.15, 0.2, 0.25, 0.3, and the like, and the ratio of the height of the flow channel 103 to the height of the second cavity 102 may be adjusted according to the addition amount of the electrolyte.

Alternatively, the number of the flow channels 103 may be plural, and the plural flow channels 103 may be arranged along the length direction of the first cavity 101. This is advantageous for enhancing the structural strength of the enclosure 10 at the location between the first cavity 101 and the second cavity 102, and for providing a uniform distribution of the flow velocity of the electrolyte along the length of the first cavity 101. Wherein, the length direction that the length direction in first appearance chamber 101, the length direction in second appearance chamber 102 are the length direction of naked electric core 20, and the length direction in first appearance chamber 101 is perpendicular with naked electric core 20 thickness direction and naked electric core 20 go up utmost point ear place length of side.

In an embodiment of the present invention, the ratio of the width of the second cavity 102 to the width of the first cavity 101 is in the range of 0.01 to 0.2, and the ratio of the width of the flow channel 103 to the width of the second cavity 102 is in the range of 0.05 to 0.8. Therefore, the capacity of the electrolyte stored in the liquid storage block 30 can be controlled, and the situation that the second containing cavity 102 and the flow channel 103 occupy too large width of the soft package battery and influence the energy density of the soft package battery is avoided.

Optionally, the first cavity 101 may be substantially rectangular, and the second cavity 102 may be substantially rectangular, so that the shape of the pouch battery is regular, which is beneficial to reducing the space occupied by the pouch battery when the battery module is assembled.

In an embodiment of the present invention, the bare cell 20 is a laminated cell, and the laminated cell is formed by laminating a negative plate, a diaphragm, and a positive plate, and has high energy density and safety performance due to the laminated cell. Moreover, by adopting the laminated battery cell, the side edge of the laminated battery cell close to the second cavity 102 has more gaps, so that the electrolyte can conveniently enter the laminated battery cell.

In an embodiment of the present invention, the number of the second cavities 102 is two, the number of the liquid storage blocks 30 is two, the two second cavities 102 are respectively located at two ends of the first cavity 101 in the width direction, and each liquid storage block 30 is accommodated in the corresponding second cavity 102, which is favorable for reducing the size of a single second cavity 102 and improving the uniformity of the distribution of the electrolyte on two sides of the bare cell 20. Further, the number of the flow channels 103 is two, and each flow channel 103 communicates the first cavity 101 and the corresponding second cavity 102, so as to ensure that the electrolyte freely flows between the first cavity 101 and the two second cavities 102.

In an embodiment of the present invention, referring to fig. 2 to 4, the enclosure 10 is provided with a sealing edge 13, the sealing edge 13 is located at a side close to the second cavity 102, and the sealing edge 13 is bent to form a hem structure 130. That is, on the side of second volume 102 remote from first volume 101: the edge of the packaging shell 10 is fixed by hot-pressing and adhering to form a sealing edge 13, and the sealing edge 13 is bent to form a folding edge structure 130. The folding edge structure 130 is adopted to increase the width of the sealing part, which is beneficial to enhancing the sealing performance of the packaging shell 10 and preventing the leakage of the pasting part of the packaging shell 10.

In an embodiment of the present invention, referring to fig. 2 to 3, the height of the first cavity 101 is greater than the height of the second cavity 102, a step structure 14 is formed on the package housing 10, the step structure 14 is located between the first cavity 101 and the second cavity 102, and the flange structure 130 is received on the step structure 14. That is, the depth of the first groove 111 is greater than the depth of the first strip-shaped groove 112, and the folding structure 130 is folded to abut against the side of the first housing 11 away from the first strip-shaped groove 112; or the depth of the second groove 121 is greater than that of the second strip-shaped groove 122, and the folding structure 130 is folded and attached to the surface, away from the second strip-shaped groove 122, of the second shell 12. Hem structure 130 is located second chamber 102 and is close to one side of stair structure 14, can utilize the difference in height of stair structure 14 like this, holds hem structure 130, avoids hem structure 130 protrusion, and can avoid hem structure 130 to paste and hold the side (on the terminal surface of packaging shell 10 width direction) that first chamber 101 one side was kept away from to second chamber 102, hinders the heat dissipation, is favorable to guaranteeing laminate polymer battery's radiating efficiency. The cross section of the step structure 14 may be a void structure in an "L" shape (see fig. 3). Optionally, the folding structure 130 may be fixed by means of an adhesive tape, an adhesive filling, etc., and the shape of the folding edge is flexible and changeable, so long as the side edge of the package case 10 is kept vertically flat, the side edge of the package case 10 in the battery module can be tightly attached to the heat dissipation structure in the battery module, so as to improve the heat dissipation efficiency.

Further, referring to fig. 2 to 4, the difference between the depths of the first groove 111 and the first strip-shaped groove 112 is greater than the difference between the depths of the second groove 121 and the second strip-shaped groove 122, and the folding structure 130 is located on a side of the first strip-shaped groove 112 away from the second strip-shaped groove 122. Thus, by using the stepped structure 14 having a large height difference to accommodate the hemming structure 130, a sufficient space can be provided for accommodating the hemming structure 130.

Alternatively, referring to fig. 2 and 3, the folding structure 130 may be a multi-fold structure, such as a two-fold or three-fold structure, so as to further improve the sealing effect. The end of the flange structure 130 may be a slot located outside the flow channel 103, or may be located on the back of the second cavity 102, or may be located in a space above the step structure 14, so as to prevent the end of the flange structure 130 from being exposed.

In an embodiment of the present invention, referring to fig. 3, the liquid storage block 30 may be a lipid gel block, which can absorb and store the electrolyte, and release the stored electrolyte into the second cavity 102 when the electrolyte in the second cavity 102 is reduced, and the lipid gel block may be a copolymer composed of vinyl acetate, butyl acrylate, methyl methacrylate, and the like, which has good swelling property and can absorb and store a large amount of electrolyte. In the liquid injection process, the lipid gel block absorbs the electrolyte, so that the liquid retention capacity can be effectively improved. In the circulation process of the soft package battery, the battery core expands to extrude the lipid gel block, the lipid gel block releases electrolyte to the second containing cavity 102, and the electrolyte flows to the laminated body in the first containing cavity 101, so that the laminated body keeps a rich liquid body. Electrolyte is consumed in a large amount in the later cycle period of the soft package battery, so that the positive pole piece and the negative pole piece cannot be completely soaked in the electrolyte, the charge-discharge internal resistance of the battery is gradually increased, and the cycle performance of the soft package battery is affected. At the moment, the existence of the lipid gel block can be equivalent to a liquid supplementing device and is the long-term circulation assistance of the battery cell.

In one embodiment of the present invention, the package housing 10 is an aluminum-plastic housing, which is convenient for processing and packaging.

In some embodiments, taking a cell matched with the VDA590 module as an example, the aluminum-plastic film has a width of 547mm and a length of 380 mm.

The first embodiment is as follows: the pit punching mode is a double-pit punching mode, that is, the first groove 111 and the second groove 121 form a first cavity 101 for accommodating the bare cell 20; the length of the first groove 111 is 515.5mm, the width of the first groove is 99mm, and the depth of the first groove is 4mm-7.2 mm; the length of the second groove 121 is 515.5mm, the width of the second groove is 99mm, and the depth of the second groove is 4mm-7.2 mm; before packaging, the distance between the first groove 111 and the second groove 121 is 2 mm; the length of the first strip-shaped groove 112 is 515.5mm, the width is 2mm-4mm, the depth is 3mm-6mm, and the depth of the first strip-shaped groove 112 is 1mm-2mm smaller than that of the first groove 111; the length of the second strip-shaped groove 122 is 515.5mm, the width is 2mm-4mm, the depth is 3mm-6mm, and the depth of the second strip-shaped groove 122 is 1mm-2mm smaller than the depth of the second groove 121; the widths of the first and second linear grooves 112 and 122 can be adjusted according to the amount of electrolyte added.

Example two: a single pit punching mode is adopted, namely the second shell 12 is in a flat plate shape, the inner wall of the first groove 111 and the plane of the second shell 12 close to the first groove 111 enclose a first containing cavity 101 for containing the naked battery cell 20, the length of the first groove 111 is 515.5mm, the width of the first groove is 99mm, and the pit depth is 4mm-7.2 mm; the first bar-shaped groove 112 has a length of 515.5mm, a width of 2mm-4mm, and a depth of 3mm-6mm, and the depth of the first bar-shaped groove 112 is 1mm-2mm smaller than the depth of the first groove 111.

The embodiment of the utility model also provides a battery pack, which comprises a box body and the soft-package battery in any embodiment, wherein the soft-package battery is arranged in the box body. Through adopting above-mentioned laminate polymer battery, be favorable to guaranteeing that positive pole piece and negative pole piece are fully soaked by electrolyte in first appearance chamber 101, guarantee laminate polymer battery's cyclicity can, improve battery package's life.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Laminate polymer battery, its characterized in that includes:

2. The pouch cell of claim 1, wherein: the packaging shell comprises a first shell and a second shell covered with the first shell, a first groove and a first strip-shaped groove are formed in the first shell, the second shell and the first groove of the first shell are enclosed to form a first containing cavity, and the second shell and the first strip-shaped groove of the first shell are enclosed to form a second containing cavity.

3. The pouch cell of claim 2, wherein: the second shell is provided with a second groove and/or a second strip-shaped groove, the second groove and the first groove are enclosed to form the first cavity, and the first strip-shaped groove and the second strip-shaped groove are enclosed to form the second cavity; or,

the second shell is flat.

4. The pouch cell of claim 1, wherein: the packaging shell comprises a first shell and a second shell covered with the first shell, a first groove is formed in the first shell, the second shell and the first groove of the first shell are enclosed to form a first containing cavity, a second strip-shaped groove is formed in the second shell, and the second strip-shaped groove of the first shell and the second shell are enclosed to form a second containing cavity.

5. The pouch cell of claim 1, wherein: a flow channel for communicating the first cavity with the second cavity is formed in the packaging shell; the height of the flow channel is smaller than that of the second cavity.

6. The pouch cell of claim 5, wherein: the ratio of the height of the second cavity to the height of the first cavity is in the range of 0.35-0.95, and/or the ratio of the height of the second cavity to the height of the flow channel is in the range of 0.05-0.34.

7. The pouch cell of claim 1, wherein: and a sealing edge is arranged on one side of the packaging shell close to the second containing cavity, and the sealing edge is bent to form a folding edge structure.

8. The pouch cell of claim 7, wherein: the height of the second cavity is smaller than that of the first cavity, so that a step structure is formed between the first cavity and the second cavity; the hem structure is received on the stair structure.

9. The pouch cell according to any one of claims 1 to 8, wherein: the liquid storage block is a lipid gel block.

10. Battery package, including the box, its characterized in that: further comprising a pouch cell according to any of claims 1-9, said pouch cell being mounted in said case.