Soft package battery cell beneficial to liquid supplementation

Abstract

The utility model provides a soft package battery cell beneficial to liquid supplementation, which relates to the technical field of batteries, a body is formed by wrapping a naked battery cell with an aluminum plastic film, two groups of tabs are arranged on the side edge of the body, a liquid supplementation pipe is arranged on one side of the body, a liquid supplementation channel is arranged in the liquid supplementation pipe, the liquid supplementation channel is communicated with the interior of the body, a plurality of hot melting parts are arranged on the outer wall of the liquid supplementation pipe, and the hot melting parts are arranged on the outer wall of the body. The liquid supplementing pipe is connected with the outer wall of the body through the hot melting part, the liquid supplementing channel is in a closed state when the hot melting part is connected with the body, a plurality of sealing strips are adhered to the outer wall of the liquid supplementing pipe, the aluminum-plastic film wraps the naked battery cell, a step part is formed on the outer edge after edge sealing, and the liquid supplementing pipe is folded outside the step part, so that the space for stacking the soft package battery in the later period is not influenced; and multiple times of sealing and liquid supplementing can be carried out through the tooth-shaped part and the hot melting part.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more particularly to a soft-pack battery core which is conducive to liquid replenishment. Background Art

[0002] In recent years, with the popularity of mobile devices and the promotion of electric vehicles, the market demand for lithium-ion batteries has continued to increase. Lithium-ion batteries are a type of secondary battery (rechargeable battery) that generally uses materials containing lithium as electrodes. They mainly rely on the movement of lithium ions between the positive and negative electrodes to operate, and are the representative of modern high-performance batteries. Lithium-ion batteries are divided into liquid lithium-ion batteries and polymer lithium-ion batteries. The main difference between them lies in the electrolyte. Liquid lithium-ion batteries use liquid electrolytes, or electrolytes, while polymer lithium-ion batteries use solid polymer electrolytes instead. This electrolyte can be solid or colloidal polymer electrolytes. Currently, most use polymer gel electrolytes. As lithium-ion batteries are used for longer, the electrolyte of both liquid and polymer lithium-ion batteries will wear out, affecting the battery's rate capability, lifespan, and other performance.

[0003] Chinese patent application number CN2022109351794 discloses a soft-pack battery, a soft-pack battery pack and a large-capacity battery, which mainly solves the problems of the complex structure, poor sealing and inability to share electrolyte of the existing soft-pack battery's refill device. The soft-pack battery includes a soft-pack battery cell and a liquid injection device; the soft-pack battery cell includes a packaging film and an electrode assembly arranged in the packaging film; the liquid injection device includes a sealing film and a liquid injection tube, and the sealing film is connected to the packaging film; the liquid injection tube is completely embedded in the sealing film, or the liquid injection tube is partially embedded in the sealing film. The liquid injection device has a simple structure and only requires a sealing film and a liquid injection tube. At the same time, the liquid injection device has good sealing. In addition, the liquid injection device can realize the sharing of electrolytes of multiple soft-pack batteries, so that the consistency of multiple soft-pack batteries after parallel connection is better.

[0004] The above solution is to replenish the electrolyte through the injection device structure set on the outer wall of the soft-pack battery cell. Although this method can replenish the electrolyte while ensuring sealing, it is worth noting that the soft-pack batteries need to be close to each other when arrayed to increase energy density. How to provide higher energy density in a limited space has always been an important issue in the field of soft-pack batteries. The injection device in the above solution will additionally increase the volume of the soft-pack battery cell, which leads to a decrease in the effective energy density. Utility Model Content

[0005] The technical problem to be solved by the present invention is that the liquid injection device in the traditional soft-pack battery cell will additionally increase the volume of the soft-pack battery cell, which leads to a decrease in the effective energy density. In view of the problems existing in the existing technology, a soft-pack battery cell that is conducive to liquid replenishment is provided.

[0006] The purpose and effect of the utility model are achieved by the following specific technical means: a soft-pack battery cell that is conducive to liquid replenishment, comprising:

[0007] The main body is composed of a bare battery cell wrapped in aluminum-plastic film, and two sets of tabs are set on the side of the main body;

[0008] A fluid infusion tube is provided on one side of the body, and a fluid infusion channel is provided inside the fluid infusion tube, and the fluid infusion channel is communicated with the interior of the body;

[0009] The outer wall of the infusion tube is provided with a plurality of hot-melt parts, and the infusion tube is connected to the outer wall of the main body through the hot-melt parts, and the infusion channel is in a closed state when the hot-melt parts are connected to the main body;

[0010] Several sealing strips are adhered to the outer wall of the infusion tube;

[0011] This design uses a refill tube to replenish fluid, and the refill tube can be folded onto the outer wall of the main body to reduce the volume occupied by the soft-pack battery cell.

[0012] A further preferred solution is that the aluminum-plastic film wraps the bare battery core and a step portion is formed on the outer edge after edge sealing.

[0013] A further preferred solution is that the connection position between the liquid infusion tube and the body is close to the position of the electrode ear.

[0014] A further preferred solution is that teeth are provided on both sides of the infusion tube, and the teeth are composed of a number of concave and convex positions in the form of circular arcs, and the concave and convex positions of the infusion tubes on both sides are symmetrically arranged.

[0015] A further preferred solution is that the heat-melting portions are arranged side by side, and the distance between adjacent heat-melting portions is at least 3 cm;

[0016] The heat-melting portion is located between every two concave tooth-shaped portions.

[0017] A further preferred solution: the step portion and the outer wall of the main body are provided with an adhesive portion near the step portion.

[0018] The outer wall of the main body is provided with a second adhesive portion at each concave tooth-shaped portion;

[0019] The first adhesive portion and the second adhesive portion are both rough surfaces.

[0020] A further preferred solution is that the infusion tube is folded onto the outer wall of the body, and sealing strips are adhered to the outer wall of the infusion tube at positions corresponding to the first and second adhesive parts, and the sealing strips are adhered to the first and second adhesive parts.

[0021] A further preferred solution: the adhesion widths between the first and second adhesive parts and the main body are at least 13 cm.

[0022] Beneficial effects of the utility model:

[0023] A sealing strip is stuck on the outer wall of the refill tube corresponding to the position of the adhesive part one. Pick up the sealing strip and stick it to the adhesive part one to seal the refill tube at two consecutive places to prevent the electrolyte inside the battery cell from leaking out under normal conditions. The refill tube is connected to the outer wall of the main body through the hot melt part, and the refill channel is in a closed state when the hot melt part is connected to the main body, which can achieve the effect of secondary sealing. Pick up the sealing strip and stick it to the adhesive part two. Because there are multiple adhesive parts two, in order to ensure the sealing effect, multiple sealing strips can be used to stick to the adhesive part two. The sealing strip is placed horizontally outside the injection tube to intercept the injection channel of the injection tube to prevent the electrolyte inside the battery cell from leaking out under normal conditions.

[0024] When opening the rehydration tube for rehydration, cut along the previous convex position of the hot-melt portion, and the hot-melt portion will lose its sealing effect. The rehydration tube can be used for rehydration again. After the rehydration is completed, the hot-melt portion at the end of the rehydration tube can be re-melted with the main body. Multiple sets of toothed portions and hot-melt portions can be used to perform sealing and rehydration multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the connection between the main body and the fluid infusion tube structure of the utility model;

[0028] Figure 3 For this utility model Figure 2 A local enlarged structural diagram in FIG.

[0029] Figure 4 This is a schematic diagram of the internal structure of the fluid infusion tube of the utility model.

[0030] Figure 1-Figure 4 Middle: main body (1), step portion (101), adhesive portion 1 (102), rehydration tube (2), rehydration channel (201), hot melt portion (202), toothed portion (3), adhesive portion 2 (4), sealing strip (5). DETAILED DESCRIPTION

[0031] To more clearly understand the above-mentioned objectives, features, and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely examples of implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements made without departing from the scope of the present invention are within the scope of patent protection of the present invention.

[0032] See also Figure 1-Figure 4 , a soft-pack battery cell that is conducive to liquid replenishment, comprising:

[0033] The main body 1 is composed of a bare battery cell wrapped with an aluminum-plastic film. The aluminum-plastic film is initially a large-size film. After punching holes on both sides of the aluminum-plastic film in a symmetrical direction, the bare battery cell is placed in one of the holes, and then the positive and negative electrode tabs are welded to the tabs of the bare battery cell. The tabs will be exposed outside the aluminum-plastic film. The aluminum-plastic film is then folded in half and sealed. The positive and negative electrode tabs are sealed into the edge of the aluminum-plastic film. In order to better perform liquid injection and replenishment in the later stage, a small distance is left outside the aluminum-plastic film without sealing, which serves as a liquid replenishment port.

[0034] The liquid infusion tube 2 is provided on one side of the body 1 and corresponds to the liquid infusion port. The liquid infusion tube 2 can be a structure cut out of a large-size film in the initial state of the aluminum-plastic film. When the aluminum-plastic film is punched and the edges are sealed, the outer edges of the liquid infusion tube 2 can be sealed together. A liquid infusion channel 201 is provided inside the liquid infusion tube 2. The liquid infusion channel 201 communicates with the interior of the body 1 through the liquid infusion port, and liquid can be injected into the battery cell through the liquid infusion channel 201.

[0035] Sealing steps:

[0036] The bare battery cell is wrapped with aluminum-plastic film and a step portion 101 is formed on the outer edge after the edge is sealed. The liquid infusion tube 2 is folded outside the step portion 101 (such as Figure 2 As shown), it does not affect the space when the soft-pack batteries are stacked later. The step portion 101 and the outer wall of the body 1 are provided with an adhesive portion 102 near the step portion 101. The outer wall of the liquid infusion tube 2 is adhered to the position corresponding to the adhesive portion 102. The sealing strip 5 is picked up and adhered to the adhesive portion 102. The two adhesive portions 102 are both adhered with sealing strips 5. At this time, the sealing strip 5 will be placed horizontally outside the liquid infusion tube 2, sealing the liquid infusion tube 2 at two consecutive locations to prevent the electrolyte from leaking out when the battery cell is in a normal state;

[0037] Further sealing: The outer wall of the infusion tube 2 is provided with a plurality of hot-melt portions 202, through which the infusion tube 2 is connected to the outer wall of the main body 1. When the hot-melt portions 202 are connected to the main body 1, the infusion channel 201 is in a closed state. When the infusion tube 2 is sealed for the first time, the hot-melt portion 202 at the end of the infusion tube 2 is hot-melt-connected to the main body 1, which can achieve a secondary sealing effect.

[0038] Further sealing: a toothed portion 3 is provided on both sides of the liquid infusion tube 2, and the toothed portion 3 is composed of several arc-shaped concave and convex positions, and the concave and convex positions of the liquid infusion tubes 2 on both sides are symmetrically arranged. An adhesive portion 2 4 is provided on the outer wall of the main body 1 and at each concave toothed portion 3. A sealing strip 5 is adhered to the outer wall of the liquid infusion tube 2 corresponding to the adhesive portion 2 4. Pick up the sealing strip 5 and stick it to the adhesive portion 2 4. Because there are multiple adhesive portions 2 4, in order to ensure the sealing effect, multiple sealing strips 5 can be used to stick to the adhesive portion 2 4. The sealing strip 5 is placed horizontally outside the liquid injection tube to block the liquid injection channel of the liquid injection tube to prevent the electrolyte from leaking out of the battery cell under normal conditions.

[0039] The first adhesive portion 102 and the second adhesive portion 4 are both rough surfaces, and the friction force when the sealing strip 5 is adhered to the first adhesive portion 102 and the second adhesive portion 4 is greater, which can effectively improve the sealing performance of the adhesion and prevent the adhesion from loosening;

[0040] Specifically, the adhesive widths between the first adhesive portion 102, the second adhesive portion 4 and the main body 1 are at least 13 cm, and the adhesive area is large, which can also improve the adhesiveness.

[0041] Preferably, the toothed portions 3 symmetrically arranged on both sides of the infusion tube 2 are for the purpose of facilitating the cutting and positioning of the end of the infusion tube 2. Each convex position is a cutting position, and the hot-melt portion 202 is located between each two concave toothed portions 3. When the infusion tube 2 is opened for infusion at a later time, it is cut along the convex position before the hot-melt portion 202, and the hot-melt portion 202 loses its sealing effect, and the infusion tube 2 can be used for infusion again. After the infusion is completed, the hot-melt portion 202 at the end of the infusion tube 2 can be hot-melted with the body 1 again. Multiple sealing and infusion can be performed by using multiple groups of toothed portions 3 and hot-melt portions 202.

[0042] The connection position between the liquid replenishing tube 2 and the main body 1 is close to the position of the pole ear, and the replenished electrolyte can quickly penetrate into the pole piece core without wasting time waiting for the core to be soaked.

[0043] The hot-melt portions 202 are arranged side by side, and the distance between adjacent hot-melt portions 202 is at least 3 cm, so as to avoid the hot-melt portions 202 being too close to each other and causing the adjacent hot-melt portions 202 to be affected by temperature.

Claims

1. A soft-pack battery cell that is conducive to fluid replenishment, characterized in that: include: The main body is composed of a bare battery cell wrapped in aluminum-plastic film, and two sets of tabs are set on the side of the main body; A fluid infusion tube is provided on one side of the body, and a fluid infusion channel is provided inside the fluid infusion tube, and the fluid infusion channel is communicated with the interior of the body; The outer wall of the infusion tube is provided with a plurality of hot-melt parts, and the infusion tube is connected to the outer wall of the main body through the hot-melt parts, and the infusion channel is in a closed state when the hot-melt parts are connected to the main body; There are several sealing strips stuck on the outer wall of the infusion tube.

2. The soft-pack battery cell that facilitates liquid replenishment according to claim 1, characterized in that: The aluminum-plastic film wraps the bare battery core and forms a step portion on the outer edge after sealing.

3. The soft-pack battery cell that facilitates liquid replenishment according to claim 1, characterized in that: The connection position between the liquid infusion tube and the body is close to the position of the pole ear.

4. The soft-pack battery cell that facilitates liquid replenishment according to claim 2, characterized in that: Both sides of the infusion tube are provided with toothed portions, and the toothed portions are composed of a plurality of concave and convex positions in the form of circular arcs, and the concave and convex positions of the infusion tubes on both sides are symmetrically arranged.

5. The soft-pack battery cell that facilitates liquid replenishment according to claim 1, characterized in that: The hot-melt portions are arranged side by side, and the distance between adjacent hot-melt portions is at least 3 cm; The heat-melting portion is located between every two concave tooth-shaped portions.

6. The soft-pack battery cell that facilitates liquid replenishment according to claim 4, characterized in that: The step portion and the outer wall of the main body are provided with an adhesive portion near the step portion. The outer wall of the main body is provided with a second adhesive portion at each concave tooth-shaped portion; The first adhesive portion and the second adhesive portion are both rough surfaces.

7. The soft-pack battery cell that facilitates liquid replenishment according to claim 6, characterized in that: The infusion tube is folded on the outer wall of the body, and sealing strips are adhered to the positions of the outer wall of the infusion tube corresponding to the first adhesive part and the second adhesive part, and the sealing strips are adhered to the first adhesive part and the second adhesive part.

8. The soft-pack battery cell that facilitates liquid replenishment according to claim 7, characterized in that: The adhesion widths between the first and second adhesive portions and the main body are at least 13 cm.

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