CN208272052U

CN208272052U - A kind of cylindrical battery electrolyte infiltration structure

Info

Publication number: CN208272052U
Application number: CN201820935569.0U
Authority: CN
Inventors: 李义; 李国敏
Original assignee: Shenzhen Green's Moral Ltd Energy Co
Current assignee: Shenzhen Grand Powersource Co ltd
Priority date: 2018-06-17
Filing date: 2018-06-17
Publication date: 2018-12-21
Anticipated expiration: 2028-06-17

Abstract

The utility model discloses an electrolytic solution infiltration structure of a cylindrical battery, aiming at solving the problem of difficulty in immersion of a cylindrical battery with high energy density. After the cylindrical battery is troughed, it is rolled into a cylinder with adhesive paper on the steel shell to hold the electrolyte, then the aluminum-plastic film is cut, and the battery is packaged in the aluminum-plastic film with a heat-sealing machine, with the upper end open. After baking, liquid is injected to keep the surplus of electrolyte, and then the aluminum-plastic film is heat-sealed. After standing for a period of time until the electrolyte fully wets the pole piece, cut off the aluminum-plastic film, seal the cap with a sealing machine, and obtain a cylindrical battery fully soaked in the electrolyte. The electrolyte infiltration structure of the cylindrical battery is simple to manufacture and easy to operate, and can fully infiltrate the electrolyte of the cylindrical battery, especially the cylindrical battery with high energy density can be infiltrated with sufficient electrolyte to ensure that the battery has enough electrolyte to ensure The battery performance is stable.

Description

A kind of cylindrical battery electrolyte infiltration structure

Technical field

The utility model belongs to field of batteries, and in particular to a kind of cylindrical battery electrolyte infiltration structure.

Background technique

Lithium ion battery with high energy density is the one of one of primary study and the developing direction in China and new energy field Secondary subversiveness is changed.Key Common Technologies class research project " high specific energy of the China in " 13 " new-energy automobile pilot special project Measure lithium ion battery technology " in propose, arrive the year two thousand twenty, battery cell energy density >=300 watt-hours/kilogram, cycle life >= 1500 times, cost≤0.8 yuan/watt-hour, security performance reaches national standard.It is wanted in " made in China 2025 " of Ministry of Industry and Information's publication Ask, the year two thousand twenty power lithium ion battery core energy density expectation reach 350 watt-hours/kilogram.

It is close to be often accompanied by high-pressure solid other than positive and negative anodes are using high gram volume material for lithium ion battery with high energy density Degree, pole piece pressure it is more real, more using volume, battery capacity is higher.As 21700 batteries can accomplish 5300mAh at present, 18650 can accomplish 3500 mAh, have very high energy density.

But pole piece compaction density height will lead to fluid injection difficulty, pole piece intermediate gaps rate is small, the electrolyte that can be accommodated It is just few, and electrolyte disengaging is difficult.Especially cylindrical battery needs electrolyte mostly using modernization continuous productive process Immediately wick into then sealing immersion liquid in core.The key of problem is that core does not suction electrolyte at all, thus causes battery electric A series of problems, such as resistance is big, the service life is short.How to allow material in cylindrical battery to be infiltrated sufficiently by electrolyte, be have it is extremely important Research topic.

Summary of the invention

The utility model provides a kind of cylindrical battery electrolyte infiltration structure, and main structure is by half-cell (1), gummed paper Cylinder (2), plastic-aluminum putamina (3) are constituted, and gummed paper cylinder (2) is entangled at the top of half-cell (1) steel shell, and half-cell (1) is encapsulated in cylindrical aluminium In plastic film shell (3), bottom and side sealing, top opening, plastic-aluminum putamina (3) top is than gummed paper cylinder (2) height.

The half-cell (1), which refers to, has been inserted into core and by the semi-finished product on negative pole lug welding to steel shell and after slot rolling Battery.

The gummed paper cylinder (2) is made of PE, PP or PET and gum, and the gum of gummed paper cylinder and steel shell top edge combine tightly It is close, it is not revealed when having electrolyte injection.

The plastic-aluminum putamina (3) is by PP, aluminium foil, CPP(cast polypropylene film cast polypropylene) it forms, be Cylindrical shape, it is open at one end.

A kind of cylindrical battery electrolyte infiltration technique of the utility model are as follows: enter shell welding slot rolling in cylinder half-cell (1) Afterwards, it is rolled into a cylinder in steel shell top with gummed paper, for holding electrolyte, then cuts aluminum plastic film, incite somebody to action half electricity with heat sealing machine Pond (1) is encapsulated into aluminum plastic film, upper end opening, bottom and side seals, then vacuum bakeout, subsequently by half-cell (1) from It being taken out in vacuum drying oven, mouth is disposed vertically upward, electrolyte is injected in gummed paper cylinder by design requirement, and extraction vacuum several times, And electrolyte is kept not blot surplus by core, then aluminum plastic film heat-sealing suitable for reading is got up, places a period of time, liquid to be electrolysed Sufficiently after wetting pole piece, aluminum plastic film is cut off, packaged nut cap is welded with sealing machine, the circle that electrolyte sufficiently infiltrates is obtained after chemical conversion Column battery.

The beneficial effects of the utility model are that cylindrical battery electrolyte infiltration structure fabrication is simple, easy to operate, can make Cylindrical battery electrolyte is adequately infiltrated, and especially high-energy density cylindrical battery can more obtain sufficient electrolyte leaching Profit, it is ensured that battery has enough electrolyte, to guarantee that battery performance is stablized.

Detailed description of the invention

Fig. 1 is that a kind of cylindrical battery electrolyte of the utility model infiltrates structural schematic diagram, 1- half-cell, 2- gummed paper in figure Cylinder, 3- plastic-aluminum putamina.

Fig. 2 is half-cell.

Fig. 3 is that half-cell adds gummed paper cylinder, 1- half-cell, 2- gummed paper cylinder in figure.

Specific embodiment

The case being set forth below is the supplementary explanation to the utility model, rather than is limitations of the present invention.

As shown in Figure 1, a kind of cylindrical battery electrolyte infiltrates structure, main structure by half-cell (1), gummed paper cylinder (2), Plastic-aluminum putamina (3) is constituted, and gummed paper cylinder (2) is entangled at the top of half-cell (1) steel shell, and half-cell (1) is encapsulated in cylindrical aluminium plastic film shell (3) in, bottom and side sealing, top opening, plastic-aluminum putamina (3) top is than gummed paper cylinder (2) height.

With model 18650, for the cylindrical battery of capacity 3.35Ah, 18650 battery of high capacity, positive plate compacted density 3.5g/cm³, 1.7 g/cm of cathode compacted density³。

Negative electrode lug and bottom are welded with resistance welding machine after core fills in steel shell, then slot rolling is at half-cell (1), rolling After slot, three circles are twined along steel shell edge suitable for reading with the thick transparent adhesive tape of 50mm wide, 0.15mm, are made into a gummed paper cylinder (2).

135mm long, 77mm wide aluminum plastic film are cut, for doing plastic-aluminum putamina (1), half-cell surface is rolled in, with heat-sealing Machine seals side and bottom.

Upper process half-cell (1) is put into vacuum oven, 85 DEG C of temperature, vacuum degree -0.09Mpa, the time 48 hours.

It is sealed with heat sealing machine plastic-aluminum putamina (3) is suitable for reading.

Normal temperature shelf two days.

Under dehumidified environment, aluminum plastic film is cut, pours out excess electrolyte, transparent adhesive tape of tearing, welding cap cap, sealing.

Battery is made into after chemical conversion.

Claims

1. An electrolyte infiltration structure of a cylindrical battery, characterized in that its main structure is composed of a half-cell (1), a tape tube (2), and an aluminum-plastic film shell (3), and the tape tube (2) is wrapped in a half The top of the battery (1) steel case, the half-cell (1) is packaged in a cylindrical aluminum-plastic film case (3), the bottom and sides are sealed, the top is open, the top of the aluminum-plastic film case (3) is higher than the plastic paper tube (2) .

2. The electrolyte infiltration structure of a cylindrical battery according to claim 1, wherein the half-cell (1) is inserted into the winding core and the negative tab has been welded to the steel shell and rolled. of semi-finished batteries.

3. The electrolyte infiltration structure of a cylindrical battery according to claim 1, characterized in that, the tape tube (2) is composed of PE, PP or PET and adhesive, and the adhesive of the tape tube and the steel shell The top edge is tightly bonded and does not leak when electrolyte is injected.

4. The electrolyte infiltration structure of a cylindrical battery according to claim 1, characterized in that the aluminum-plastic film case (3) is composed of PP, aluminum foil, and CPP, and is cylindrical with one end open.