CN214227097U

CN214227097U - Soft package battery capable of supplementing electrolyte

Info

Publication number: CN214227097U
Application number: CN202120444714.7U
Authority: CN
Inventors: 王丹; 车佩佩
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: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-09-17
Anticipated expiration: 2031-03-01

Abstract

The utility model relates to a battery technology field discloses a can supply laminate polymer battery of electrolyte, including the casing, inject in the casing and hold the chamber, hold the intracavity and be equipped with electric core, hold the intracavity and still be equipped with from interior to exterior and wrap up imbibition layer, polypropylene layer, plastic-aluminum layer and the nylon layer of electric core in proper order, imbibition layer can absorb electrolyte, and the imbibition layer is configured to release electrolyte when the pressure that receives is greater than preset pressure. The utility model discloses a can supply laminate polymer battery's of electrolyte suction layer absorption has partial electrolyte, in the use, along with the consumption of liquid electrolyte, the pressure that the suction layer received increases gradually, and the pressure that receives when the suction layer is greater than and can release electrolyte when predetermineeing pressure to for the liquid electrolyte of electric core supply, the laminate polymer battery has been solved because of the consumption of electrolyte and has reduced the problem of battery performance in the use, has prolonged the laminate polymer battery's that can supply electrolyte life.

Description

Soft package battery capable of supplementing electrolyte

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a can supply laminate polymer battery of electrolyte.

Background

The soft package battery is widely applied to 3C consumer electronic products and new energy automobiles due to the advantages of high energy density, light weight, long cycle life, good safety and the like, the existing soft package battery is mainly a lithium ion soft package battery, the lithium ion soft package battery is mainly composed of a shell, an electric core, a busbar, a flexible circuit board and the like, the electric core comprises a positive electrode lug, a negative electrode lug, liquid electrolyte and the like, the lithium ion soft package battery on the market is in the charge and discharge process, lithium ions are inserted and separated back and forth between the positive electrode and the negative electrode, during charging, the lithium ions are separated from the positive electrode, the lithium ions are inserted into the negative electrode through the electrolyte, and the reverse is realized during discharging. Therefore, the electrolyte is a medium for lithium ion transmission in the lithium ion battery, so that the performances of the soft package lithium ion battery, such as cycle life, multiplying power and the like, are closely related to the electrolyte.

Because the electrolyte and the positive and negative electrodes continuously generate oxidation-reduction reaction in the lithium ion charging and discharging process, when the injection amount of the electrolyte is too small, the positive and negative electrode active substances cannot be fully soaked, and the battery capacity is influenced; in addition, the electrolyte is insufficient in the later period of circulation, so that the circulation water-skipping is caused, and the service life of the battery is influenced. However, since the soft package lithium ion battery is wrapped by the aluminum-plastic layer, when the injection amount of the electrolyte is increased, on one hand, the battery is soft, and the assembly of the battery is affected; on the other hand, the risk of breaking the packaging area of the aluminum-plastic layer exists in the manufacturing process of the battery due to excessive free electrolyte, and the yield of the soft package battery is reduced.

SUMMERY OF THE UTILITY MODEL

Based on the above, an object of the utility model is to provide a can supply laminate polymer battery of electrolyte, when the laminate polymer battery of this can supply electrolyte of encapsulation, under the prerequisite that does not increase liquid state electrolyte, can release partial electrolyte in the use in order to prolong the life of the laminate polymer battery that can supply electrolyte, and can not reduce laminate polymer battery's yield.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a can supply laminate polymer battery of electrolyte, includes the casing, inject in the casing and hold the chamber, it is equipped with electric core to hold the intracavity, it still is equipped with from interior to exterior and wraps up in proper order to hold the intracavity the imbibition layer, polypropylene layer, plastic-aluminum layer and the nylon layer of electric core, the imbibition layer can absorb electrolyte, the pressure that the imbibition layer was configured to receive can release when being greater than preset pressure electrolyte.

As a preferable scheme of the soft package battery capable of replenishing the electrolyte, the preset pressure is between 0.25MPa and 1 MPa.

In a preferred embodiment of the pouch battery that can be replenished with the electrolyte, the liquid absorbing layer is a polymer film, and the polymer film absorbs the electrolyte to form a gel film.

As a preferable scheme of the soft package battery capable of replenishing the electrolyte, the polymer film is at least one of a polyacrylate film and a polyacrylamide film.

As a preferable scheme of the soft package battery capable of replenishing the electrolyte, the thickness of the liquid absorbing layer is between 80 and 300 mu m.

As a preferable scheme of the soft package battery capable of replenishing the electrolyte, the thickness of the polypropylene layer is between 60 and 150 mu m.

As a preferable scheme of the soft package battery capable of replenishing the electrolyte, the thickness of the aluminum plastic layer is between 20 and 80 mu m.

As a preferable scheme of the soft package battery capable of replenishing electrolyte, the thickness of the nylon layer is between 10 and 50 μm.

As an optimal scheme of the soft package battery capable of supplementing electrolyte, the battery cell comprises a battery cell body, a positive electrode lug and a negative electrode lug, wherein the positive electrode lug and the negative electrode lug are arranged at the end part of the battery cell body.

The utility model has the advantages that: the utility model discloses a can supply laminate polymer battery's of electrolyte suction layer absorption has partial electrolyte, in the use, along with the consumption of liquid electrolyte, the pressure that the suction layer received increases gradually, and the pressure that receives when the suction layer is greater than and can release electrolyte when predetermineeing pressure to for the liquid electrolyte of electric core supply, the laminate polymer battery has been solved because of the consumption of electrolyte and has reduced the problem of battery performance in the use, has prolonged the laminate polymer battery's that can supply electrolyte life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a cross-sectional view of a pouch battery capable of replenishing electrolyte according to an embodiment of the present invention;

fig. 2 is a partial enlarged view of fig. 1 at a.

In the figure:

1. an electric core; 11. a cell body; 12. a positive electrode tab; 13. a negative electrode tab;

21. a liquid absorption layer; 22. a polypropylene layer; 23. an aluminum-plastic layer; 24. a nylon layer.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

This embodiment provides a can supply laminate polymer battery of electrolyte, as shown in fig. 1 and fig. 2, this can supply laminate polymer battery of electrolyte is lithium ion laminate polymer battery, this lithium ion laminate polymer battery includes casing (not shown in the figure), inject in the casing and hold the chamber, it is equipped with electric core 1 to hold the intracavity, it still is equipped with from interior to exterior wraps up electric core 1's imbibition layer 21 in proper order to hold the intracavity, polypropylene layer 22, plastic-aluminum layer 23 and nylon layer 24, imbibition layer 21 can absorb electrolyte, imbibition layer 21 is configured to release electrolyte when the pressure that receives is greater than preset pressure.

The liquid suction layer 21 of the laminate polymer battery capable of supplementing electrolyte provided by the embodiment absorbs part of electrolyte, and in the use process, along with the consumption of liquid electrolyte, the pressure intensity that the liquid suction layer 21 receives is gradually increased, and the pressure intensity that the liquid suction layer 21 receives is greater than the preset pressure intensity, so that the electrolyte can be released, thereby supplementing the liquid electrolyte for the battery cell 1, solving the problem that the performance of the laminate polymer battery is reduced due to the consumption of the electrolyte in the use process, and prolonging the service life of the laminate polymer battery capable of supplementing electrolyte.

Specifically, as shown in fig. 1, the battery cell 1 of the present embodiment includes a cell body 11, a positive electrode tab 12 and a negative electrode tab 13, where the positive electrode tab 12 and the negative electrode tab 13 are both disposed at an end portion of the cell body 11. The battery cell body 11 is a pole piece roll, and the pole piece roll is formed by stacking and winding a positive pole piece, a diaphragm and a negative pole piece. In other embodiments, the battery cell body 11 may also be a pole piece layer, the pole piece layer is formed by sequentially stacking a negative pole piece, a diaphragm, a positive pole piece, a diaphragm, a negative pole piece, and the like, and the specific structure of the battery cell body 11 is selected according to actual needs.

In the use, the pole piece is rolled up and is leaded to the lattice parameter to change and take place the inflation because of the desorption lithium ion, along with the increase of length of time of using, the volume crescent of pole piece book, the pressure that imbibition layer 21 received also correspondingly increases, when pressure is greater than preset pressure, imbibition layer 21 can release liquid electrolyte, for this lithium ion laminate polymer battery replenishment liquid electrolyte, under the electrochemical performance condition under the lithium ion laminate polymer battery initial condition not influenced, the problem that lithium ion laminate polymer battery reduces the battery performance because of electrolyte consumption in the use has been solved, the life of lithium ion laminate polymer battery has been prolonged.

The preset pressure of the embodiment is between 0.25Mpa and 1 Mpa. The liquid absorbent layer 21 is a polymer film, and the polymer film absorbs the electrolyte to form a gel film. The polymer film is at least one of polyacrylate film and polyacrylamide film, namely the polymer film is composed of polyacrylate and/or polyacrylamide. In other embodiments, the specific structure of the polymer film is not limited to the limitation of this embodiment, and may also be composed of other polymers capable of absorbing the electrolyte and releasing the electrolyte when the pressure applied to the polymer film is greater than a predetermined pressure, where the predetermined pressure may be less than 0.25Mpa or greater than 1Mpa, and is specifically related to the material of the polymer film.

Specifically, form the gel membrane after imbibition layer 21 absorbs electrolyte, when the pressure that imbibition layer 21 received is less than predetermineeing pressure, electrolyte in imbibition layer 21 can not released, this laminate polymer battery that can supply electrolyte can not cause this laminate polymer battery that can supply electrolyte's hardness soft on the side because liquid electrolyte is too much in the equipment process promptly, just can not influence this laminate polymer battery's that can supply electrolyte equipment yet, and simultaneously, the extra absorptive electrolyte of imbibition layer 21 can not break through the encapsulation district of plastic-aluminum layer 23, the yield of laminate polymer battery can not be reduced to the electrolyte of absorbing in imbibition layer 21 and the imbibition layer 21 of addding. After using a period of time, the pressure that imbibition layer 21 received increases gradually, and when the pressure that imbibition layer 21 received was greater than when predetermineeing pressure, imbibition layer 21 can release partial electrolyte to for electric core 1 replenishment electrolyte, compare with prior art, this lithium ion laminate polymer battery's performance obtains improving, has prolonged lithium ion laminate polymer battery's life.

Specifically, the polypropylene layer 22 of the present embodiment is made of polypropylene, the thickness of the polypropylene layer 22 is between 60 μm and 150 μm, and the polypropylene is melted and has viscosity above 100 ℃. Therefore, the heat seal of the lithium ion soft package battery mainly depends on that the polypropylene layer 22 is melted and bonded together under the heating effect of the seal head, and meanwhile, the polypropylene layer 22 can also prevent the electrolyte from contacting with the aluminum-plastic layer 23, so that the aluminum-plastic layer 23 is prevented from being corroded. In other embodiments, the thickness of the polypropylene layer 22 can be less than 60 μm or more than 150 μm, depending on the actual requirement.

The aluminum plastic layer 23 of this embodiment functions to prevent the penetration of water and vapor, and the thickness of the aluminum plastic layer 23 is between 20 μm and 80 μm. The lithium ion soft package battery can not enter water and steam, and generally requires that the water content of the pole piece roll is in PPM level, so the aluminum plastic layer 23 needs to block the water and steam from permeating. Specifically, the PPM level, i.e. the ratio of the total mass of water and steam to the total mass of the pole piece roll, is one million, i.e. the lithium ion pouch battery does not allow water and steam to enter. The aluminum-plastic layer 23 reacts with oxygen in the air at room temperature to form a compact oxide film, so that water vapor cannot penetrate, the interior of the battery cell 1 is protected, and the aluminum-plastic layer 23 also provides pit punching plasticity when the aluminum-plastic layer 23 is formed. In other embodiments, the thickness of the aluminum-plastic layer 23 may also be less than 20 μm or greater than 80 μm, which is specifically set according to actual needs.

The nylon layer 24 of this embodiment's effect prevents that plastic-aluminum layer 23 from warping, and nylon layer 24's thickness is located between 10 mu m-50 mu m, before lithium ion laminate polymer battery made, and nylon layer 24 can guarantee that plastic-aluminum layer 23 can not take place to warp, and nylon layer 24 can also protect plastic-aluminum layer 23 not by the fish tail simultaneously, makes at lithium ion laminate polymer battery after, and nylon layer 24 can also prevent still that plastic-aluminum layer 23 from breaking. In other embodiments, the thickness of the nylon layer 24 may be less than 10 μm or greater than 50 μm, depending on the actual requirement.

The liquid absorbent layer 21 of the present embodiment has a thickness of 80 μm to 300 μm. When the thickness of the liquid absorbing layer 21 is less than 80 μm, the content of the electrolyte absorbed by the liquid absorbing layer 21 is low, and the electrolyte additionally consumed due to consumption in the using process of the lithium ion soft package battery cannot be supplemented, so that the problem that the battery performance of the lithium ion soft package battery is reduced due to consumption of the electrolyte in the using process of the lithium ion soft package battery cannot be solved; when the thickness of imbibition layer 21 is greater than 300 mu m, on the one hand, the content of the electrolyte that imbibition layer 21 absorbs is more, in case the pressure that imbibition layer 21 received is higher than preset pressure, the content of the electrolyte that imbibition layer 21 released is greater than the electrolyte of lithium ion laminate polymer battery in-service consumption and extra loss, make the encapsulation district of this lithium ion laminate polymer battery's aluminum-plastic layer 23 have the risk of being broken through, the life of this lithium ion laminate polymer battery has been reduced, on the other hand, the thickness of imbibition layer 21 is thicker, be unfavorable for lithium ion laminate polymer battery's miniaturization setting. In other embodiments, the thickness of the liquid absorbent layer 21 may be less than 80 μm or more than 300 μm, which is set according to practical requirements.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides a can supply laminate polymer battery of electrolyte, a serial communication port, which comprises a housin, inject in the casing and hold the chamber, it is equipped with electric core (1) to hold the intracavity, it still is equipped with from interior to exterior wraps up in proper order to hold the intracavity the imbibition layer (21), polypropylene layer (22), plastic-aluminum layer (23) and nylon layer (24) of electric core (1), imbibition layer (21) can absorb electrolyte, can release when imbibition layer (21) are configured to the pressure that receives and are greater than preset pressure electrolyte.

2. The electrolyte replenishable pouch battery according to claim 1, wherein said predetermined pressure is between 0.25Mpa and 1 Mpa.

3. The electrolyte replenishable pouch battery according to claim 1, wherein the liquid absorbent layer (21) is a polymer film which forms a gel film after absorbing the electrolyte.

4. The electrolyte replenishable pouch battery according to claim 3, wherein said polymer film is at least one of a polyacrylate film and a polyacrylamide film.

5. The electrolyte replenishable pouch battery according to claim 1, wherein the thickness of the liquid absorbent layer (21) is between 80 μm and 300 μm.

6. The electrolyte replenishable pouch cell according to claim 1, wherein said polypropylene layer (22) has a thickness between 60 μm and 150 μm.

7. The electrolyte-replenishable pouch battery according to claim 1, wherein the thickness of the aluminum plastic layer (23) is between 20 μm and 80 μm.

8. The electrolyte replenishable pouch cell according to claim 1, wherein said nylon layer (24) has a thickness between 10 μm and 50 μm.

9. The electrolyte-replenishable pouch battery according to claim 1, wherein the battery cell (1) comprises a cell body (11), a positive electrode tab (12) and a negative electrode tab (13), and the positive electrode tab (12) and the negative electrode tab (13) are both arranged at the end of the cell body (11).