Soft package battery capable of supplementing liquid for multiple times
By forming an "L"-shaped liquid replenishment channel during the aluminum-plastic film encapsulation of the soft-pack battery, the problem of the battery being unable to be replenished with liquid is solved, enabling the battery to be reusable and extending its lifespan, while reducing costs.
Patent Information
- Application Number
- CN202422633043.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing pouch batteries suffer from capacity decay due to electrolyte loss during the end-of-life (EOL) stage and during use. The inability to replenish the electrolyte leads to reduced battery capacity, increased internal resistance, and reduced cycle life. Furthermore, the batteries cannot be reused, increasing manufacturing costs.
A soft-pack battery capable of multiple liquid replenishment is designed. By forming an "L"-shaped liquid replenishment channel during aluminum-plastic film encapsulation, multiple liquid injections are allowed. The aluminum-plastic film has a certain length at the tab end to facilitate subsequent liquid replenishment, and it does not occupy space after encapsulation.
It enables the reusability of pouch batteries, reduces battery costs, extends battery life, and reduces internal resistance by replenishing electrolyte through the electrolyte replenishment channel, thereby activating active materials and increasing capacity.
Smart Images
Figure CN223757526U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of lithium ion battery especially relates to a soft package battery of liquid supplementing for many times. BACKGROUND
[0002] The soft package battery core includes an aluminum plastic film and a laminated body encapsulated in the aluminum plastic film, and the laminated body includes a plurality of pole pieces and a separator sequentially laminated and electronically separated between adjacent pole pieces.
[0003] During the EOL (End of Life) stage and the use process of the battery pack, the electrolyte inside the soft package battery core will be consumed, resulting in capacity attenuation of the soft package battery core.
[0004] The existing soft package battery is a disposable battery, which is difficult to open after heat pressing and sealing of the aluminum plastic film (as shown in FIG. Figure 1 The electrolyte cannot be supplemented, resulting in the inability of the battery to be used twice, which in turn leads to high manufacturing cost of the battery.
[0005] Therefore, the soft package battery of liquid supplementing for many times is proposed to solve the problem of the inability of the soft package battery to supplement liquid. UTILITY MODEL CONTENTS
[0006] The utility model discloses a soft package battery of liquid supplementing for many times, which belongs to the technical field of lithium ion battery.
[0007] The utility model discloses a soft package battery of liquid supplementing for many times, which belongs to the technical field of lithium ion battery.
[0008] Further preferably, the length of the liquid supplementing channel is greater than the width of the edge seal.
[0009] Further preferably, the battery core is formed by winding or stacking a positive pole piece, a separator and a negative pole piece.
[0010] Further preferably, the positive pole piece is provided with a positive pole lug, the negative pole piece is provided with a negative pole lug, the aluminum plastic film is top-sealed to the top of the battery core, and the positive pole lug and the negative pole lug at the top end of the battery core are exposed.
[0011] Further preferably, the width of the liquid supplementing channel is 1-50mm.
[0012] Compared with the prior art, the present application has the following beneficial effects:
[0013] The aluminum plastic film is "L"-shapedly packaged during the second sealing, so that a certain length of the aluminum plastic film is left at the tab end to form a liquid supplementing channel; the channel can be used for multiple liquid injection and packaging, and the packaged battery does not occupy space and has no influence on the appearance, thereby reducing the cost of the battery product and realizing the reusability of the soft package battery; when the electrolyte in the battery is insufficient or is about to dry up, the electrolyte can be injected into the battery through the liquid supplementing channel, on the one hand, the electrolyte in the battery can be supplemented, so as to reduce the internal resistance of the battery and increase the cycle life, and on the other hand, the pole piece can be soaked again, some dried active substances can be activated, and the capacity can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a structure schematic view of the soft package battery before improvement in the background art;
[0015] Figure 2 It is a structure schematic view of the soft package battery after heat sealing in the present application;
[0016] Figure 3 It is a structure schematic view of the soft package battery after the liquid supplementing channel is folded back in the present application.
[0017] In the figure: battery body 1, aluminum plastic film 2, side seal one 3, top seal 4, side seal two 5, edge seal 6, liquid supplementing channel 7, positive tab 11, and negative tab 12. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.
[0019] Reference Figures 2-3 A soft package battery capable of multiple liquid supplementing includes a battery body 1 and an aluminum plastic film 2 wrapped around the battery body 1. The aluminum plastic film 2 is folded on one side, and the remaining sides are sealed by a side seal one 3, a top seal 4, a side seal two 5, and an edge seal 6. The top seal 4 is located on the upper side of the battery body 1. The side seal two 5 is in an "L" shape. The upper end of the side seal two 5 is spaced apart from the top seal 4 to form a liquid supplementing channel 7. The liquid supplementing channel 7 extends away from the battery body 1. The end of the liquid supplementing channel 7 is sealed by the edge seal 6.
[0020] In the embodiment, the aluminum plastic film 2 is used for L-shaped packaging of the battery core body 1 (bare battery core) during the second sealing, so that a certain length of the aluminum plastic film is reserved at the tab end to form a liquid supplement channel 7, the end of the liquid supplement channel 7 is sealed by the side seal 6, when the battery core body 1 needs to be supplemented with liquid, the side seal 6 is cut along the inner edge of the side seal 6 to open the inlet of the liquid supplement channel 7, at this time, the liquid supplement channel 7 is in communication with the battery core body 1, and the battery core body 1 can be supplemented with liquid through the liquid supplement channel 7, and after the supplement of liquid is completed, the end of the liquid supplement channel 7 is heat-sealed and sealed.
[0021] In the embodiment, the side seal one 3 is a vertical heat seal, the top seal 4 is a horizontal heat seal, the side seal one 3 is overlapped with the top seal 4 at the top end, and the side seal two 5 is an L-shaped heat seal, the vertical section of the side seal two 5 is parallel to the side seal one 3, the horizontal section of the side seal two 5 is parallel to the top seal 4, and the horizontal section is arranged at a distance from the top seal 4, and the distance is 1-50 mm.
[0022] The aluminum plastic film is used for L-shaped packaging during the second sealing, so that a certain length of the aluminum plastic film is reserved at the tab end; subsequent multiple liquid injection and liquid supplement are facilitated, so that the battery is repeatedly used, the liquid supplement channel 7 can be reversely folded and tightly attached to the concave portion of the aluminum plastic film at the tab end after the battery manufacturing process is completed, the length can be adjusted as required, the battery appearance size and the PACK assembly space in the later period are not modified, so that the cost of the battery product and the reusability of the soft package battery are reduced.
[0023] The length of the liquid supplement channel 7 is greater than the width of the side seal 6.
[0024] In the embodiment, the length of the liquid supplement channel 7 is greater than 5 times the width of the side seal 6, so that the size required for heat sealing of the end of the liquid supplement channel 7 is ensured after the side seal 6 is cut multiple times, subsequent multiple liquid supplement (at least 5 times) of the battery core body 1 is facilitated, the length can be adjusted as required, and the specific size is not limited, as long as the length of the liquid supplement channel 7 is greater than the width of the side seal 6, the length is within the protection scope of the utility model.
[0025] In the embodiment, the side seal one 3, the top seal 4, the side seal two 5 and the side seal 6 are all sealed by heat pressing, the aluminum plastic film is pressed by upper and lower die heads, the upper and lower die heads need to be heated, the heating temperature is (170-210) DEG C, and the heat pressing time is (2-6) s.
[0026] The battery core body 1 is an electric core formed by winding or stacking a positive pole piece, a diaphragm and a negative pole piece, the positive pole piece is provided with a positive pole lug 11, the negative pole piece is provided with a negative pole lug 12, the aluminum plastic film 2 is used for top sealing of the top of the battery core body 1, and the positive pole lug 11 and the negative pole lug 12 at the top end of the battery core are exposed.
[0027] In the embodiment, the liquid supplementing channel 7 can be arranged near the positive electrode tab 11 or near the negative electrode tab 12, and the liquid supplementing channel 7 can be arranged on any side of the battery core body 1. The position of the liquid supplementing channel 7 is not limited herein, as long as the liquid supplementing channel 7 is arranged on the battery core body 1, which is within the protection scope of the present application.
[0028] The width of the liquid supplementing channel 7 is 1-50 mm.
[0029] In the embodiment, the width of the liquid supplementing channel 7 can be any number from 1, 2, 3 to 50 mm, and the liquid supplementing channel 7 can be used to supplement the liquid in the battery core body 1.
[0030] The aluminum plastic film is L-shaped during the sealing process, and a certain length of the aluminum plastic film is reserved at the end of the tab to form a liquid supplementing channel. The channel can be used for multiple liquid injection and sealing, and the sealed battery does not occupy space and does not affect the appearance, thereby reducing the cost of the battery product and realizing the reusability of the soft package battery. When the electrolyte in the battery core is insufficient or is about to dry up, the electrolyte can be injected into the battery core through the liquid supplementing channel. On the one hand, the electrolyte in the battery can be supplemented, thereby reducing the internal resistance of the battery and increasing the cycle life. On the other hand, the tab can be soaked again, and some dry active substances can be activated to improve the capacity.
Claims
1. A soft-pack battery capable of multiple liquid replenishment, characterized by, The battery cell comprises a battery cell body and an aluminum plastic film wrapped around the battery cell body. One side of the aluminum plastic film is folded, and the remaining sides are sealed by side seal one, top seal, side seal two and edge seal. The top seal is located on the upper side of the battery cell body. The side seal two is in an "L" shape structure. The upper end of the side seal two is spaced apart from the top seal to form a liquid supplement channel. The liquid supplement channel extends away from the battery cell body. The end of the liquid supplement channel is sealed by the edge seal. 2.The soft-pack battery of claim 1, wherein, The length of the liquid supplement channel is greater than the width of the edge seal. 3.The soft-pack battery of claim 1, wherein, The battery cell body is formed by winding or stacking a positive electrode sheet, a separator and a negative electrode sheet. 4.The soft-pack battery of claim 3, wherein, The positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab. The aluminum plastic film is top sealed on the top of the battery cell body, and the positive electrode tab and the negative electrode tab at the top end of the battery cell are exposed. 5.The soft-pack battery of claim 1, wherein, The width of the liquid supplement channel is 1-50 mm.