阅读说明：本技术 气体收集方法以及装置 (Gas collection method and apparatus ) 是由 袁庆华 于 2020-11-18 设计创作，主要内容包括：本发明提供了一种气体收集方法以及装置,该气体收集方法将电池封装于密封容器中,并对密封容器进行抽真空,然后再将密封容器放入烘箱中进行烘烤,在容置腔内的气压超过预定值时,电池壳体上的泄压阀打开,且电池壳体的容置腔内的气体经泄压阀而流动至密封容器的收集腔中。其中,通过将装有电池的密封容器放入烘箱中进行烘烤,能够将电池壳体上的泄压阀打开并使电池内部的气体填充到真空的密封容器内,无需在密封容器上进行开孔,密封效果好,并且实现了对带金属外壳的圆柱电池的气体进行收集。(The invention provides a gas collection method and a device, wherein a battery is packaged in a sealed container, the sealed container is vacuumized, then the sealed container is placed in an oven for baking, when the air pressure in an accommodating cavity exceeds a preset value, a pressure release valve on a battery shell is opened, and the gas in the accommodating cavity of the battery shell flows into a collection cavity of the sealed container through the pressure release valve. Wherein, toast in putting into the oven through the sealed container that will be equipped with the battery, can open the relief valve on the battery casing and make the inside gas of battery fill in the vacuum sealed container, need not to carry out the trompil on sealed container, sealed effectual to the gas of the cylindrical battery of taking metal casing has been realized collecting.)

1. A gas collection method for collecting gas generated during operation of a battery, the gas collection method comprising the steps of:

preparing a battery, a sealed container with a collection cavity and a baking device;

the battery comprises a battery shell, a winding core and a pressure release valve, wherein the winding core generates gas when electrolyte generates electrochemical reaction, the pressure release valve is connected with the battery shell, and the battery shell is provided with an accommodating cavity for the winding core;

packaging the battery: packaging the battery in the collection cavity and vacuumizing the collection cavity;

collecting gas: and placing the sealed container into the baking device, baking the sealed container by the baking device, wherein when the air pressure in the accommodating cavity exceeds a preset value, the pressure release valve is opened, and the gas in the accommodating cavity flows to the collecting cavity through the pressure release valve.

2. The gas collection method of claim 1, wherein the sealed container is made of an aluminum plastic film, and the sealed container has a vacuum state and an inflated state in the step of collecting the gas, and the sealed container changes from the vacuum state to the inflated state in the process of flowing the gas into the sealed container.

3. The gas collection method of claim 2, wherein the sealed container has a width of 2-4 times the diameter of the battery case when the sealed container is in the inflated state.

4. The gas collection method of claim 3, wherein the height of the sealed container is 2-3 times the height of the battery case when the sealed container is in the inflated state.

5. The gas collection method according to claim 1, wherein in the step of collecting gas, a baking temperature for baking the sealed container is 75 to 85 ℃.

6. The gas collecting method according to claim 5, wherein in the step of collecting gas, the baking time for baking the sealed container is 24 hours or more.

7. The gas collection method according to claim 1, wherein the pressure relief valve is opened when the pressure in the housing chamber is 1.8 to 2.3Mpa in the step of collecting the gas.

8. The gas collection method according to any one of claims 1 to 7, wherein the baking device is an oven.

9. The gas collecting device is characterized by comprising a battery, a sealed container with a collecting cavity and a baking device, wherein the battery is packaged in the sealed container, the sealed container is arranged in the baking device, and the baking device is used for baking the sealed container so that the sealed container collects gas generated by the battery.

10. The gas collecting device according to claim 9, wherein the battery includes a battery case, a winding core that generates gas in a heated state, and a pressure release valve connected to the battery case, the battery case has a receiving cavity for the winding core, and when the baking device bakes the sealed container, the gas in the receiving cavity opens the pressure release valve under the action of hot pressure and flows to the collecting cavity.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a gas collection method and device.

Background

The lithium ion battery can generate gas under different unsafe states, for example, the types and the proportions of the gas generated after formation, circulation, thermal shock and overcharge are different, and the chemical reaction between the electrode of the battery and electrolyte and the storage environment can be reversely analyzed by analyzing the components and the proportions of the gas of the battery, so that the subsequent improvement of the performance and the safety of the lithium ion battery is greatly facilitated.

In order to analyze the components of the battery gas, firstly, the battery gas needs to be collected, at present, a mold capable of sucking the gas is basically manufactured, an uncharged winding core of a cylindrical battery and an electrolyte are put into a sealing device, the uncharged winding core is charged by respectively connecting positive and negative external tabs extending out of a sealing container to positive and negative electrodes of the cylindrical battery, at the moment, the electrolyte can chemically react with the positive and negative electrodes under the condition of first charging to generate a large amount of gas, the gas in the sealing device is pumped at an opening position by using a gas pumping needle through opening holes on the sealing device, the sealing of the opening position is difficult to be made, the gas leakage is easy to generate, the gas collection effect is poor, and the sealing device in the device can only collect the gas generated by the winding core without the cylindrical metal shell, if the gas generated by the cylindrical battery with the metal shell needs to be collected, it needs to be disassembled in the sealed container, increasing the workload.

Disclosure of Invention

The invention aims to provide a gas collecting method, which aims to solve the technical problems that the existing gas collecting method is poor in gas collecting effect and cannot collect cylindrical batteries with metal shells.

In order to achieve the purpose, the invention adopts the technical scheme that: there is provided a gas collection method for collecting gas generated during operation of a battery, the gas collection method comprising the steps of:

preparing a battery, a sealed container with a collection cavity and a baking device;

the battery comprises a battery shell, a winding core and a pressure release valve, wherein the winding core generates gas when electrolyte generates electrochemical reaction, the pressure release valve is connected with the battery shell, and the battery shell is provided with an accommodating cavity for the winding core;

packaging the battery: packaging the battery in the collection cavity and vacuumizing the collection cavity;

collecting gas: and placing the sealed container into the baking device, baking the sealed container by the baking device, wherein when the air pressure in the accommodating cavity exceeds a preset value, the pressure release valve is opened, and the gas in the accommodating cavity flows to the collecting cavity through the pressure release valve.

Further, the sealed container is made of an aluminum plastic film, and in the step of collecting the gas, the sealed container has a vacuum state and a swollen state, and the sealed container changes from the vacuum state to the swollen state in the process of flowing the gas to the sealed container.

Further, the width of the sealing container is 2-4 times the diameter of the battery case when the sealing container is in the inflated state.

Further, the height of the sealing container is 2-3 times the height of the battery case when the sealing container is in the inflated state.

Further, in the step of collecting the gas, the baking temperature for baking the sealed container is 75-85 ℃.

Further, in the step of collecting the gas, the baking time period for baking the sealed container is 24 hours or more.

Further, the baking device is an oven.

Further, in the step of collecting the gas, when the pressure in the accommodating cavity is 1.8-2.3Mpa, the pressure relief valve is opened.

The gas collection method provided by the invention has the beneficial effects that: compared with the prior art, the gas collection method comprises the steps of packaging a battery in a sealed container, vacuumizing the sealed container, then placing the sealed container in a baking oven for baking, opening a pressure release valve on a battery shell when the air pressure in an accommodating cavity exceeds a preset value, enabling gas in the accommodating cavity of the battery shell to flow into a collection cavity of the sealed container through the pressure release valve, then extracting the gas in the sealed container by using an injector, inserting the injector into an analysis instrument to test and analyze the gas to obtain gas components generated by the battery, and finally reversely pushing an electrochemical reaction generated by electrolyte according to the analyzed gas components. Wherein, toast in putting into the oven through the sealed container that will be equipped with the battery, can open the relief valve on the battery casing and make the inside gas of battery fill in the vacuum sealed container, need not to carry out the trompil on sealed container, sealed effectual to the gas of the cylindrical battery of taking metal casing has been realized collecting.

The invention also provides a gas collecting device, which comprises a battery, a sealed container with a collecting cavity and a baking device, wherein the battery is packaged in the sealed container, the sealed container is arranged in the baking device, and the baking device is used for baking the sealed container so that the sealed container collects gas generated by the battery.

Further, the battery includes battery case, the book core that produces gas under the heated state and connect in battery case's relief valve, battery case has the confession roll up the holding chamber that the core set up baking during the sealed container, the gas of holding intracavity will under the effect of hot pressing the relief valve is opened and is flowed extremely collect the chamber.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic flow chart of a gas collection method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a gas collecting device according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

100. a battery; 200. sealing the container; 300. a baking device; .

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, a gas collection method according to the present invention will now be described. A gas collection method for collecting gas generated during operation of a battery, the gas collection method comprising the steps of:

s1, preparing the battery, the sealed container with the collection cavity and the baking device. Specifically, because lithium ion battery all can produce gas under the unsafe condition of difference, so the battery of preparing is lithium ion battery to this battery includes the battery shell, rolls up the core and connects the relief valve in battery shell that produce gaseous book when electrolyte takes place electrochemical reaction, and battery shell has the holding chamber that supplies to roll up the core setting, and wherein roll up and be equipped with electrolyte in the core, electrolyte can gasify under the heated state.

And S2, packaging the battery. Specifically, the battery is packaged in the collection cavity, and the collection cavity is vacuumized, so that the battery is in a vacuum environment.

And S3, collecting the gas. Put into baking equipment with sealed container, baking equipment toasts sealed container, and electrolyte can gasify under the effect of heating in the battery, can produce gas at the holding intracavity, because the heating action, the atmospheric pressure of holding intracavity can constantly increase, and when the atmospheric pressure of holding intracavity exceeded the predetermined value, the relief valve was opened, and the gaseous of holding intracavity flows to collecting the chamber through the relief valve.

Compared with the prior art, the gas collection method provided by the invention has the advantages that the battery is packaged in the sealed container, the sealed container is vacuumized, then the sealed container is placed in the oven to be baked, when the air pressure in the accommodating cavity exceeds a preset value, the pressure release valve on the battery shell is opened, the gas in the accommodating cavity of the battery shell flows into the collection cavity of the sealed container through the pressure release valve, then the gas in the sealed container is extracted by the injector and is inserted into an analyzer to test and analyze the gas, so that the gas component generated by the battery is obtained, and finally the electrochemical reaction generated by the electrolyte is reversely pushed according to the analyzed gas component. Wherein, toast in putting into the oven through the sealed container that will be equipped with the battery, can open the relief valve on the battery casing and make the inside gas of battery fill in the vacuum sealed container, need not to carry out the trompil on sealed container, sealed effectual to the gas of the cylindrical battery of taking metal casing has been realized collecting.

Further, in the present embodiment, the hermetic container is made of an aluminum plastic film, and in the step of collecting the gas, the hermetic container has a vacuum state and a swollen state, and the hermetic container changes from the vacuum state to the swollen state in the process of flowing the gas to the hermetic container. Because the aluminum-plastic film has higher deformability, the sealed container is easier to be changed into a bulging state from a vacuum state, and the sealed container made of the aluminum-plastic film is easier to be punctured, so that the operator can collect the gas to be analyzed in the gas collection cavity conveniently.

The sealed container of this embodiment includes, but is not limited to, the materials listed above, and may be other materials not listed in this embodiment but known to those skilled in the art.

Preferably, the battery is a cylindrical lithium ion battery with a metal casing.

Further, in the present embodiment, the width of the sealing container is 2 to 4 times the diameter of the battery case when the sealing container is in the inflated state, which is a size that can ensure that the sealing container has a sufficiently large lateral space.

Further, in the present embodiment, the height of the sealed container is 2 to 3 times the height of the battery case when the sealed container is in the inflated state, and the size can ensure that the sealed container has a sufficiently large vertical space.

Further, in this embodiment, in the step of collecting the gas, the baking temperature for baking the sealed container is 75 to 85 ℃. In particular, this temperature interval ensures that most of the electrolyte solvents, such as EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), do not boil.

Further, in the present embodiment, in the step of collecting the gas, the baking time period for baking the sealed container is 24 hours or more. Specifically, the time period can ensure that the commonly used electrolyte completely opens the gas pressure valve in a heating state so as to ensure that the gas sealed in the battery shell can fill the sealed container and change the sealed container from a vacuum state to a bulging state.

The baking time in the embodiment can be other times, as long as the pressure intensity is enough to exceed the pressure of the pressure release valve of the cover plate after the electrolyte in the battery is gasified.

Further, in this embodiment, the baking device is an oven.

Further, in the present embodiment, in the step of collecting the gas, the pressure relief valve is opened when the pressure in the accommodating chamber is 1.8-2.3 Mpa.

Further, in this embodiment, after the gas is collected, the swollen aluminum-plastic film is taken out, the gas in the syringe is evacuated using a syringe with a needle, the gas in the swollen aluminum-plastic film is extracted, and then the syringe is inserted into the gas inlet of the gas chromatography mass spectrometer. The gas species can be tested qualitatively and quantitatively by a gas chromatograph mass spectrometer, and if the gas is analyzed to contain ethyl acetate, the gas needs to be removed because the boiling point of ethyl acetate is 77.1 ℃. And finally, the electrochemical reaction of the battery is reversely deduced according to the test result.

Referring to fig. 2, the present invention further provides a gas collecting device, which includes a battery 100, a sealed container 200 having a collecting cavity, and a baking device 300, wherein the battery 100 is packaged in the sealed container 200, the sealed container 200 is disposed in the baking device 300, and the baking device 300 is used for baking the sealed container 200 to make the sealed container 200 collect gas generated by the battery 100.

Referring to the drawings, as an embodiment of the gas collecting device provided by the present invention, a battery 100 includes a battery case, a winding core generating gas in a heated state, and a pressure release valve connected to the battery case, the battery case has a receiving cavity for the winding core, and when the baking device 300 bakes the sealed container 200, the gas in the receiving cavity opens the pressure release valve under the action of heat pressure and flows to the collecting cavity.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.