CN219658824U

CN219658824U - Soft package electric core, group battery and electronic equipment

Info

Publication number: CN219658824U
Application number: CN202320286589.0U
Authority: CN
Inventors: 张丽洁
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-09-08
Anticipated expiration: 2033-02-20

Abstract

The utility model discloses a soft package battery cell, a battery pack and electronic equipment, which comprise a bare cell and a flexible shell, wherein the bare cell comprises a battery cell body, the bare cell is accommodated in the flexible shell, the flexible shell comprises a first wall and a second wall which are oppositely arranged, two third walls which are oppositely arranged and two fourth walls which are oppositely arranged, and the first wall and the second wall respectively cover two surfaces of the bare cell which are opposite; the first wall includes a first sub-wall and a second sub-wall; the edge of the first sub-wall is provided with a first heat-sealing part extending away from the battery cell body, the edge of the second sub-wall is provided with a second heat-sealing part extending away from the battery cell body, and the first heat-sealing part and the second heat-sealing part are connected in a heat-sealing mode to form a laminated body. According to the utility model, the heat dissipation performance of the three edge seals is maintained, and meanwhile, the single edge of the flexible shell is prevented from being subjected to extension stress to become a packaging weak point, so that the packaging strength is improved, and the problem that the battery core is easy to leak due to the fact that the flexible shell is damaged by external force is effectively solved.

Description

Soft package electric core, group battery and electronic equipment

Technical Field

The utility model relates to a soft package battery cell, a battery pack and electronic equipment.

Background

At present, the new energy automobile industry is vigorously developed, and the lithium ion battery is widely applied to the new energy automobile. Along with the continuous improvement of the endurance requirements, the requirements of people on the energy density of the lithium ion battery are also continuously improved, and meanwhile, the higher requirements on the cycle life and the safety performance of the lithium ion battery are also brought.

The temperature is critical to the performance of lithium ion batteries and high temperatures can cause battery aging. High temperatures can increase battery capacity and rate capability, but can reduce battery stability, causing degradation in cycle life. Meanwhile, the temperature inside the battery pack is unevenly distributed, so that the performance consistency of the single batteries is changed, uneven attenuation among the single batteries is caused, and finally the whole battery pack is invalid. Therefore, thermal management of the battery is very necessary. During operation of a lithium battery, the battery must generate heat due to the presence of battery resistance. The heat dissipation performance of the battery is improved, the service life of the battery can be prolonged, and the battery performance is maintained.

The soft-package battery cell generally adopts a three-edge-sealing or four-edge-sealing design, and the three-edge-sealing design has relatively good heat dissipation performance due to the fact that one side of the soft-package battery cell is provided with fewer edges. However, in the traditional three-edge sealing design, the edge sealing is arranged on the side in the thickness direction, the packaging strength is low, the edge sealing mode can enable the corner parts of the non-edge sealing part to be fragile, the leakage risk exists, and potential safety hazards exist during use.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provides a soft-package battery cell, a battery pack and electronic equipment.

The utility model solves the technical problems by the following technical scheme:

the utility model provides a soft package battery core, comprising:

the bare cell comprises a cell body, wherein the cell body is provided with two opposite surfaces in the thickness direction, and the cell body is provided with two opposite end surfaces in the length direction;

the bare cell is accommodated in the flexible shell, the flexible shell comprises a first wall, a second wall, two third walls and two fourth walls, the first wall and the second wall are oppositely arranged, the two third walls are oppositely arranged, and the two fourth walls are oppositely arranged, and the first wall and the second wall are respectively coated with two surfaces;

the first wall comprises a first sub-wall and a second sub-wall, the adjacent side edges of the first sub-wall are respectively connected with two third walls and one fourth wall, and the adjacent side edges of the second sub-wall are respectively connected with two third walls and the other fourth wall;

the edge of the first sub-wall is provided with a first heat sealing part which deviates from the extension of the battery cell body, the edge of the second sub-wall is provided with a second heat sealing part which deviates from the extension of the battery cell body, and the first heat sealing part and the second heat sealing part are in heat sealing connection to form a laminated body.

In this scheme, soft packet of electric core adopts above-mentioned structure, change the narrow limit of side of traditional three limit banding into with the banding setting in the great face side of broad, when having kept the heat dispersion of three banding, make the extension of flexible shell born by the both sides face of flexible shell, even make the stress that flexible shell parcel electric core body produced born by two sides, prevent that unilateral bearing extension stress of flexible shell from becoming the encapsulation weak point, promoted encapsulation intensity, effectively solved the flexible shell and receive the easy damaged problem that leads to electric core weeping of taking place of external force.

Preferably, the bare cell further comprises a tab, the tab extends from the end face of the cell body and penetrates through the third wall, tab glue is arranged on the tab, and the tab glue is connected with the third wall in a heat sealing mode.

In this scheme, adopt above-mentioned mode to carry out the heat-seal to the terminal surface of electric core body and seal, further avoid the problem of electric core weeping.

Preferably, the tab includes a positive tab and a negative tab, and the positive tab and the negative tab are respectively disposed on the two end surfaces; or alternatively, the first and second heat exchangers may be,

the positive electrode lug and the negative electrode lug are arranged on the same end face.

In this scheme, according to the difference of production demand, with the setting of utmost point ear in the different positions of electric core body.

Preferably, the cell body has a central axis extending in a length direction, and the stacked body is close to the central axis.

In this scheme, set up the heat-seal lamination body of flexible shell near the position at electric core body axis for the stress that the flexible shell parcel electric core body produced is evenly born by both sides face, prevents that both sides face of flexible shell from bearing the extension stress of great difference and influence encapsulation intensity.

Preferably, both ends of the laminated body extend to both the end faces, respectively.

In this scheme, extend the both ends of lamination body to the both ends face of electric core body respectively, when promoting encapsulation intensity, avoid taking place the weeping phenomenon.

Preferably, the cell body is further provided with an adhesive member, and two ends of the adhesive member are respectively adhered to the first sub-wall and the second sub-wall.

In this scheme, avoid the heat-seal lamination body of flexible shell to take place not hard up or split after bearing the stress that wraps up electric core body and produce for a long time through setting up the sticky piece, guarantee the fastness of heat-seal department, promote encapsulation intensity.

Preferably, the plurality of the adhesive pieces are arranged at intervals in the length direction of the battery cell body.

In this scheme, through setting up a plurality of sticky pieces and further promoting the fastness of encapsulation, promote encapsulation intensity.

Preferably, the flexible shell is an aluminum plastic shell.

The utility model also provides a battery pack which comprises the soft package battery cell.

The utility model also provides electronic equipment comprising the soft package battery core.

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.

The utility model has the positive progress effects that: according to the soft-package battery cell, the side narrow edge sealing of the traditional three-edge sealing is changed into the edge sealing arranged on the wider large-surface side, so that the heat dissipation performance of the three edge sealing is reserved, meanwhile, the extension of the flexible shell is borne by the two side surfaces of the flexible shell, namely, the stress generated by the flexible shell wrapping the battery cell body is borne by the two side surfaces, the single-side bearing extension stress of the flexible shell is prevented from becoming a packaging weak point, the packaging strength is improved, and the problem that the flexible shell is easy to damage due to external force, so that the battery cell leaks is effectively solved.

Drawings

Fig. 1 is a front view of a soft-pack battery cell according to an embodiment of the present utility model.

Fig. 2 is a rear view of a soft-pack cell in an embodiment of the utility model.

Fig. 3 is an assembly schematic diagram of a flexible case of a soft-packaged battery cell and a bare battery cell according to an embodiment of the utility model.

Fig. 4 is a schematic view of a flexible shell structure of a soft-package battery cell according to an embodiment of the utility model.

Fig. 5 is a schematic structural diagram of a bare cell according to an embodiment of the present utility model.

Reference numerals illustrate:

bare cell 100

Cell body 101

Surface 1011

End face 1012

Positive tab 102

Negative electrode tab 103

Flexible shell 200

First wall 210

First sub-wall 211

First heat-seal portion 2111

Second sub-wall 212

Second heat-seal portion 2121

Second wall 220

Laminate 213

Third wall 230

Fourth wall 240

Adhesive element 300

Detailed Description

The present utility model is further illustrated by way of the following examples, which are not, therefore, to be construed as limiting the scope of the utility model.

As shown in fig. 1 to 5, the present embodiment provides a soft package battery cell, which includes a bare cell 100 and a flexible case 200, the bare cell 100 includes a battery cell body 101, the battery cell body 101 has two opposite surfaces 1011 in a thickness direction, and the battery cell body 101 has two opposite end surfaces 1012 in a length direction. The bare cell 100 is accommodated in the flexible casing 200, and the flexible casing 200 includes a first wall 210 and a second wall 220 which are disposed opposite to each other, two third walls 230 disposed opposite to each other, and two fourth walls 240 disposed opposite to each other, where the first wall 210 and the second wall 220 respectively cover two opposite surfaces 1011 of the bare cell 100. The first wall 210 includes a first sub-wall 211 and a second sub-wall 212, wherein the adjacent sides of the first sub-wall 211 are respectively connected with two third walls 230 and one fourth wall 240, and the adjacent sides of the second sub-wall 212 are respectively connected with two third walls 230 and the other fourth wall 240. The edge of the first sub-wall 211 is provided with a first heat-seal portion 2111 extending away from the cell body 101, the edge of the second sub-wall 212 is provided with a second heat-seal portion 2121 extending away from the cell body 101, and the first heat-seal portion 2111 and the second heat-seal portion 2121 are heat-sealed to each other to form the laminate 213. In this embodiment, the flexible case 200 is an aluminum plastic case. In other embodiments, other materials for the encapsulation of the bare cell 100 may be used for the flexible case 200.

The soft package battery cell adopts the structure, the side narrow edge sealing of the traditional three edge sealing is changed into the edge sealing which is arranged on the wider large side, the heat dissipation performance of the three edge sealing is reserved, meanwhile, the extension of the flexible shell 200 is borne by the two sides of the flexible shell 200, namely, the stress generated by the flexible shell 200 wrapping the battery cell body 101 is borne by the two sides, the unilateral bearing extension stress of the flexible shell 200 is prevented from becoming a packaging weak point, the packaging strength is improved, and the problem that the flexible shell 200 is easy to damage due to external force is effectively solved.

The cell body 101 may specifically further include a positive electrode sheet, a negative electrode sheet, and a separator. The cell body 101 mainly relies on metal ions to move between the positive and negative pole pieces. The cell body 101 may be a wound body or a laminated body. Specifically, the positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer, where the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive current collector comprises a positive current collecting part and a positive lug connected to the positive current collecting part, wherein the positive current collecting part is coated with a positive active material layer, and the positive lug is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate can comprise a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode current collecting part and a negative electrode tab connected to the negative electrode current collecting part, wherein the negative electrode current collecting part is coated with a negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene).

The bare cell 100 further includes a tab extending from the end surface 1012 of the cell body 101 and passing through the third wall 230, and a tab adhesive is disposed on the tab and is connected with the third wall 230 in a heat sealing manner. In this embodiment, the end face 1012 of the cell body 101 is sealed by heat sealing in the above manner, so as to further avoid the problem of leakage of the cell.

The tab includes a positive tab 102 and a negative tab 103, and in this embodiment, the positive tab 102 and the negative tab 103 are disposed on two end faces 1012, respectively. In some embodiments, positive tab 102 and negative tab 103 are disposed on the same end face 1012. The setting positions of the positive electrode lug 102 and the negative electrode lug 103 are set at different positions of the cell body 101 according to different production requirements.

The cell body 101 has a central axis extending in the longitudinal direction, and the stacked body 213 is close to the central axis. In this embodiment, the heat-seal laminated body 213 of the flexible casing 200 is disposed near the central axis of the cell body 101, so that the stress generated by wrapping the cell body 101 with the flexible casing 200 is uniformly borne by the two sides, and the two sides of the flexible casing 200 are prevented from bearing greatly different extension stresses to affect the packaging strength.

The laminate 213 extends to both end faces 1012 at both ends. The two ends of the laminated body 213 are respectively extended to the two end faces 1012 of the cell body 101, so that the package strength is improved and the leakage phenomenon is avoided.

As shown in fig. 1, the cell body 101 is further provided with an adhesive member 300, and two ends of the adhesive member 300 are adhered to the first sub-wall 211 and the second sub-wall 212, respectively. By arranging the adhesive piece 300, the heat-sealing laminated body 213 of the flexible shell 200 is prevented from loosening or splitting after being subjected to stress generated by wrapping the battery cell body 101 for a long time, the firmness of a heat-sealing part is ensured, and the packaging strength is improved.

In this embodiment, the adhesive member 300 is an adhesive tape. The plurality of adhesive tapes are arranged at intervals in the length direction of the battery cell body 101. The firmness of packaging is further improved through the plurality of adhesive tapes, and the packaging strength is improved.

The embodiment of the utility model also provides a battery pack which comprises the soft package battery core.

The embodiment of the utility model also provides electronic equipment comprising the soft package battery core. Specifically, the electronic device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The above-described electronic device is not particularly limited in the embodiment of the present utility model.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims

1. A soft pack cell, comprising:

2. The soft package cell of claim 1, wherein the bare cell further comprises a tab extending from the end face of the cell body and through the third wall, the tab being provided with a tab glue thereon, the tab glue being heat sealed to the third wall.

3. The soft package cell of claim 2, wherein the tab comprises a positive tab and a negative tab, the positive tab and the negative tab being disposed on the two end faces, respectively; or alternatively, the first and second heat exchangers may be,

4. The pouch cell of claim 1, wherein the cell body has a central axis extending in a length direction, the stack being proximate the central axis.

5. The pouch cell of claim 4, wherein both ends of the laminate body extend to both of the end faces, respectively.

6. The soft pack cell of claim 1, wherein the cell body is further provided with an adhesive member, and both ends of the adhesive member are adhered to the first sub-wall and the second sub-wall, respectively.

7. The pouch cell of claim 6, wherein the plurality of adhesive members are spaced apart along the length of the cell body.

8. The soft pack cell of any one of claims 1-7, wherein the flexible casing is an aluminum plastic casing.

9. A battery comprising a soft pack cell as claimed in any one of claims 1 to 8.

10. An electronic device comprising a soft pack cell as claimed in any one of claims 1 to 8.