CN110836704B - Device for measuring internal gas production of lithium ion battery - Google Patents
Device for measuring internal gas production of lithium ion battery Download PDFInfo
- Publication number
- CN110836704B CN110836704B CN201911102734.XA CN201911102734A CN110836704B CN 110836704 B CN110836704 B CN 110836704B CN 201911102734 A CN201911102734 A CN 201911102734A CN 110836704 B CN110836704 B CN 110836704B
- Authority
- CN
- China
- Prior art keywords
- gas
- battery
- liquid
- outlet pipe
- sampling container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
Abstract
The invention discloses a device for measuring the gas production in a lithium ion battery, which comprises a sampling container, and is characterized by further comprising a gas volume measuring device, a gas outlet pipe I and a gas outlet pipe II, wherein a sealing piston with a push rod is arranged at the upper end of the sampling container, a battery to be measured is placed in the lower end of the sampling container, the bottom of the sealing piston is fixedly connected with a thimble, the tip of the thimble is right opposite to the center of the top of the battery to be measured, two gas outlets are arranged below the sealing piston on the side wall of the upper end of the sampling container, the two gas outlets are respectively connected with the gas outlet pipe I and the gas outlet pipe II in a sealing manner, a valve is arranged on the gas outlet pipe I, and the other end of the gas outlet pipe II is connected with the gas volume measuring device in a sealing manner. The invention has simple manufacture, low cost and convenient use, and the gas volume measuring device can accurately measure and has high precision only by puncturing the upper end of the battery to deflate the battery and introducing the gas in the battery into the gas volume measuring device through the gas outlet pipe II.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a device for measuring the internal gas production of a lithium ion battery.
Background
As a type of secondary batteries having various advantages such as high operating voltage, high energy density, long cycle life, safety, environmental protection, and the like, lithium ion batteries are being widely used in the fields of digital products, electric vehicles, energy storage, and the like. During the working process of the lithium ion battery, active substances in the lithium ion battery can generate various side reactions, so that gas is generated. When the gas production is accumulated to a certain degree, the internal protection mechanism of the battery is triggered, and the battery is broken to fail. Therefore, the detection of the gas production rate in the battery is of great significance.
At present, the detection method of the gas production volume of the lithium ion battery mainly comprises a drainage method and a cylinder piston method, and when the drainage method is used for measuring the gas volume, the gas to be measured can be in full contact with liquid. However, the gas generating components of the battery are very complex and may contain components which are easily soluble in water or even react with water, so that the application of the drainage method to the measurement of the gas generating volume of the battery has large errors. The basic principle of measuring the volume change of gas by using a cylinder piston method is that the gas in a cylinder expands to push a piston, and the volume increment of the gas is calculated by measuring the displacement of the piston. According to the ideal gas state equation PV ═ nRT, it is easy to obtain, and when the gas volume change is measured by using a cylinder piston method, the gas pressure is guaranteed to be constant. However, the friction between the piston and the inner wall of the cylinder is unavoidable, so that when the cylinder piston method is used for measuring the gas production volume of the battery, it is difficult to ensure that the air pressure in the cylinder is equal before and after the battery to be measured releases gas.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device for measuring the gas production rate in a lithium ion battery, which has the advantages of simple manufacture, low cost, convenient use, accurate measurement and great production practice significance.
The technical scheme of the invention is realized as follows:
the utility model provides a device for measuring lithium ion battery internal gas production volume, includes sample container, its characterized in that still includes gas volume measuring device, outlet duct I, outlet duct II, the sample container upper end is equipped with the sealed piston of taking the push rod, and the inside battery that awaits measuring that is used for of lower extreme, sealed piston bottom fixedly connected with thimble, the pointed end of thimble is just to the battery top center that awaits measuring, the below of sealed piston is equipped with two gas outlets on the lateral wall of sample container upper end, these two gas outlets respectively with outlet duct I, II sealing connection of outlet duct, be equipped with the valve on the outlet duct I, II other ends of outlet duct and gas volume measuring device sealing connection.
Further, the gas volume measuring device comprises two liquid measuring tubes with scales and a connecting hose, the liquid measuring tubes with the scales adopt a universal burette, two ends of the connecting hose are respectively connected with the lower ends of the two liquid measuring tubes in a sealing mode, one end of each liquid measuring tube is communicated with the corresponding air outlet tube II through a sealing plug, and the other liquid measuring tube is communicated with the atmosphere.
Furthermore, the sealing piston is made of rubber or made of hard materials inside and rubber materials outside so as to ensure air tightness.
Furthermore, the ejector pin is a high-hardness pointed screw, and the lower part of the sealing piston, which is connected with the ejector pin, is designed to be conical, so that excessive puncture when the top of the battery to be tested is punctured is avoided.
Furthermore, liquid which is not compatible with gas produced by the battery is injected into the two liquid measuring pipes, and the liquid level height of the liquid does not exceed the height of half of the liquid measuring pipe.
Furthermore, non-volatile grease such as silicone oil is dripped on the liquid surface.
Furthermore, the sampling container adopts transparent high polymer materials such as polypropylene or organic glass, and the appearance is the cylinder cylindric for place the cylinder battery, the diameter slightly is greater than the battery diameter that awaits measuring.
Further, the sampling container adopts transparent high polymer materials such as polypropylene or organic glass, and the appearance is the cuboid cylindric for place square battery, the size slightly is greater than the battery size that awaits measuring.
The working principle of the invention is as follows: 1) cutting off a top cover of the battery to be tested, placing the battery to be tested in the cavity of the sampling container with the anode facing upwards, opening a valve on the air outlet pipe I, installing a sealing piston, enabling the tip of the ejector pin to be close to or tangent with the top end of the battery to be tested, and marking the position of the sealing piston at the moment as an initial position a 0; 2) after the liquid levels of the two liquid measuring tubes of the gas volume measuring device are on the same horizontal plane, closing the valve and recording the liquid level reading V0 at the moment; 3) slowly rotating to push the sealing piston until the thimble punctures the battery, and returning the sealing piston to the initial position a 0; 4) standing the detection device for a fixed time, moving the liquid measuring tube communicated with the atmosphere up and down along the vertical direction to ensure that the liquid levels at the two ends of the gas volume measuring device are on the same horizontal plane again, and recording the liquid level reading V1 at the moment; 5) the absolute value of V1-V0 is the gas production volume.
Compared with the prior art, the invention has the beneficial effects that: 1) the gas volume measuring device is simple to manufacture, low in cost and convenient and fast to use, the upper end of the battery to be measured is only required to be punctured to enable the battery to be measured to be deflated, and gas in the battery to be measured is introduced into the gas volume measuring device through the gas outlet pipe II, so that the measurement is accurate; 2) the piston is made of rubber or is wrapped by rubber, so that the sealing performance is good, and the detection precision is high; 3) liquid which is not dissolved with the gas generated by the battery is injected into the liquid measuring tube, and non-volatile grease such as silicon oil is dripped to seal the liquid level, so that the liquid is prevented from being volatilized or the generated gas is prevented from being dissolved into the liquid to influence the detection result.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: 1. the cylinder battery that awaits measuring, 2, sample container, 3, piston, 4, thimble, 5, outlet duct I, 6, valve, 7, outlet duct II, 8, sealing plug, 9, buret, 10, coupling hose, 11, buret, 1a, the square battery that awaits measuring, 2a, sample container, 3a, piston.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the gas production rate detection device for a cylindrical lithium ion battery according to an embodiment of the present invention includes a sampling container 2, a gas volume measurement device, a gas outlet pipe i 5, and a gas outlet pipe ii 7.
The sampling container 2 is made of transparent high polymer materials such as polypropylene or organic glass, is cylindrical and is used for placing the cylindrical battery 1 to be tested, and the diameter of the cylindrical battery 1 to be tested is slightly larger than that of the cylindrical battery to be tested. The upper end of the sampling container 2 is provided with a sealing piston 3 with a push rod, the sealing piston 3 is made of rubber or made of hard material, the rubber is wrapped outside, so as to ensure air tightness, a thimble 4 is fixedly connected to the bottom of the sealing piston 3, the tip of the thimble 4 is right opposite to the center of the top of the cylindrical battery 1 to be tested, the thimble 4 is a sharp screw with high hardness, the lower part of the sealing piston 3 is connected with the thimble 4 and is designed to be conical, excessive puncture when the top of the cylindrical battery 1 to be tested is prevented from being punctured, two air outlets are arranged below the sealing piston 3 on the side wall of the upper end of the sampling container 2, the two air outlets are respectively connected with an air outlet pipe I5 and an air outlet pipe II 7 in a sealing manner, a valve 6 is arranged on the air outlet pipe I5, and the other end of the air outlet pipe II 7 is connected with a gas volume measuring device in a sealing manner.
The gas volume measuring device comprises two liquid measuring tubes 9 and 11 with scales and a connecting hose 10, the liquid measuring tubes 9 and 11 with the scales adopt universal burettes, two ends of the connecting hose 10 are respectively connected with the lower ends of the two liquid measuring tubes 9 and 11 in a sealing manner, the upper end of the liquid measuring tube 9 is communicated with the II 7 of the gas outlet tube through a sealing plug 8, and the other liquid measuring tube 11 is communicated with the atmosphere.
Liquid which is not dissolved with the gas generated by the battery is injected into the two liquid measuring tubes 9 and 11, the liquid level of the liquid is not more than half of the height of the liquid measuring tubes 9 and 11, and non-volatile grease such as silicone oil is dripped on the liquid surface.
As shown in fig. 2, the embodiment of the present invention is used for detecting the internal gas production of a prismatic lithium ion battery, and is basically the same as the first embodiment, except that the sampling container 2a has a rectangular cylinder shape for placing the prismatic battery 1a to be detected, and has a size slightly larger than that of the prismatic battery 1a to be detected, accordingly, the upper end of the sealing piston 3a is also set to be square in shape consistent with the internal shape of the sampling container 2a, and the bottom is set to be conical, so as to avoid over-piercing when piercing the top of the prismatic battery 1a to be detected.
The working modes of the first embodiment and the second embodiment of the invention are as follows: 1) cutting off a top cover of the battery to be tested, placing the battery to be tested in a cavity of a sampling container 2/2a with the anode facing upwards, opening a valve 6 on an air outlet pipe I5, installing a sealing piston 3/3a, enabling the tip of a thimble 4 to be close to or tangent with the top end of the battery, and marking the position of a sealing piston 3/3a at the moment as an initial position a 0; 2) after the liquid levels of the two liquid measuring tubes 9 and 11 of the gas volume measuring device are on the same horizontal plane, closing the valve 6 and recording the liquid level reading V0 at the moment; 3) slowly rotating to push the sealing piston 3/3a until the thimble 4 pierces the battery, and returning the sealing piston 3/3a to the initial position a 0; 4) standing the detection device for a fixed time, moving the liquid measuring tube 11 communicated with the atmosphere up and down along the vertical direction to ensure that the liquid levels at the two ends of the gas volume measuring device are on the same horizontal plane again, and recording the liquid level reading V1 at the moment; 5) the absolute value of V1-V0 is the gas production volume.
Table 1 shows the internal gas production test data for three groups of 7 21700 cylindrical batteries using the first embodiment of the present invention. Both group 1 and group 2 were 21700 cylindrical batteries aged and then stored in an environment at 25 ℃ for 15 days, and the standing time of group 1 was 10 minutes and that of group 2 was 30 minutes in the above step 4); group 3 is 21700 cylindrical cells stored in an environment at 60 ℃ for 7 days after aging, with a rest time of 10 minutes.
| Numbering | Group 1(mL) | Group 2(mL) | Group 3(mL) |
| Sample 1 | 8.62 | 8.11 | 18.66 |
| Sample 2 | 7.32 | 7.80 | 19.53 |
| Sample 3 | 8.80 | 8.83 | 17.99 |
| Sample 4 | 7.86 | 7.67 | 17.99 |
| Sample 5 | 8.36 | 8.47 | 18.00 |
| Sample 6 | 7.81 | 9.02 | 17.14 |
| |
8.29 | 8.58 | 18.45 |
| Median number | 8.29 | 8.47 | 18.00 |
| Mean number of | 8.15 | 8.35 | 18.11 |
| Standard deviation of | 0.472 | 0.464 | 1.000 |
| Coefficient of variation | 0.058 | 0.055 | 0.055 |
As can be seen from Table 1, the stability of the gas production rate of the lithium ion battery detected by the embodiment of the invention is high, and the test requirements are met.
The sealing pistons 3 and 3a in the first and second embodiments of the present invention only facilitate pushing the thimble 4 to pierce the battery to be tested to release the gas. Before and after testing, the sealing piston 3/3a is in the same position. After the battery is punctured, the gas pushes the liquid level in the liquid measuring tubes 9 and 11 to displace, and at the moment, the gas is only contacted with the liquid level in the liquid measuring tubes 9 and 11 and is very limited to be contacted with the liquid, so that the interaction between the gas and the liquid is avoided to the maximum extent. On the other hand, the gas volume measuring device consists of two graduated measuring tubes 9, 11 and a movable connecting hose 10, which is in essence a communicating vessel. Therefore, the liquid level at the two ends of the gas volume measuring device is kept flat, and the air pressure above the liquid level at the two ends can be ensured to be equal, that is, the air pressure in the cavity of the sampling container 2/2a is equal to the air pressure in the liquid measuring tube 9 and the air pressure in the liquid measuring tube 11 is equal to the atmospheric pressure. Therefore, on the premise of ensuring the stability of the external temperature, the embodiment of the invention is used for measuring the gas production volume of the battery, so that the equal air pressure in the cavity of the sampling container 2/2a before and after the test can be ensured, and the measurement accuracy of the gas volume is also ensured.
Therefore, the method for measuring the gas production rate of the cylindrical lithium ion battery has the advantages of simple operation, convenience and quickness in use, accuracy in measurement and low device cost.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A device for measuring the internal gas production of a lithium ion battery comprises a sampling container, and is characterized by further comprising a gas volume measuring device, a gas outlet pipe I and a gas outlet pipe II, wherein a sealing piston with a push rod is arranged at the upper end of the sampling container, a battery to be measured is placed in the lower end of the sampling container, the bottom of the sealing piston is fixedly connected with a thimble, the tip end of the thimble is right opposite to the center of the top of the battery to be measured, two gas outlets are arranged below the sealing piston on the side wall of the upper end of the sampling container, the two gas outlets are respectively connected with the gas outlet pipe I and the gas outlet pipe II in a sealing manner, a valve is arranged on the gas outlet pipe I, and the other end of the gas outlet pipe II is connected with the gas volume measuring device in a sealing manner;
the gas volume measuring device comprises two liquid measuring tubes with scales and a connecting hose, wherein the liquid measuring tubes with the scales adopt universal burettes, two ends of the connecting hose are respectively connected with the lower ends of the two liquid measuring tubes in a sealing manner, the upper end of one liquid measuring tube is communicated with the gas outlet tube II through a sealing plug, and the other liquid measuring tube is communicated with the atmosphere;
the sealing piston is made of rubber or made of hard material inside and covered with rubber outside to ensure air tightness;
the thimble is a high-hardness pointed screw, and the lower part of the sealing piston, which is connected with the thimble, is designed to be conical, so that excessive puncture is avoided when the top of the battery is punctured;
liquid which is not compatible with gas produced by the battery is injected into the two liquid measuring pipes, and the liquid level height of the liquid does not exceed the height of half of the liquid measuring pipe;
the sampling container is made of transparent high polymer materials such as polypropylene or organic glass, is cylindrical and is used for placing cylindrical batteries, and the diameter of the sampling container is slightly larger than that of the battery to be tested.
2. The device of claim 1, wherein the gas production rate inside the lithium ion battery is measured by: and non-volatile grease such as silicone oil is dripped on the liquid surface.
3. The device of claim 1, wherein the gas production rate inside the lithium ion battery is measured by: the sampling container is made of transparent high polymer materials such as polypropylene or organic glass, is in a cuboid cylinder shape and is used for placing a square battery, and the size of the sampling container is slightly larger than that of the battery to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102734.XA CN110836704B (en) | 2019-11-12 | 2019-11-12 | Device for measuring internal gas production of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102734.XA CN110836704B (en) | 2019-11-12 | 2019-11-12 | Device for measuring internal gas production of lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110836704A CN110836704A (en) | 2020-02-25 |
| CN110836704B true CN110836704B (en) | 2021-08-03 |
Family
ID=69576472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911102734.XA Active CN110836704B (en) | 2019-11-12 | 2019-11-12 | Device for measuring internal gas production of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110836704B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324871B (en) * | 2020-02-29 | 2022-07-05 | 溧阳天目先导电池材料科技有限公司 | Method for detecting carbon layer coating integrity of lithium ion battery cathode material |
| CN112665678A (en) * | 2020-12-28 | 2021-04-16 | 湖北亿纬动力有限公司 | Battery gas production amount measuring device and battery gas production amount measuring method |
| CN115184824B (en) * | 2022-09-14 | 2022-12-27 | 江苏时代新能源科技有限公司 | System, method and device for measuring residual space in battery |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8034003B2 (en) * | 2003-09-11 | 2011-10-11 | Depuy Mitek, Inc. | Tissue extraction and collection device |
| CN101281984A (en) * | 2008-05-23 | 2008-10-08 | 天津力神电池股份有限公司 | Method and apparatus for detecting inner pressure of lithium ion battery |
| CN101685031B (en) * | 2008-09-24 | 2011-07-13 | 上海比亚迪有限公司 | Method for measuring lithium battery interior gas amount |
| CN102868003A (en) * | 2012-08-28 | 2013-01-09 | 合肥国轩高科动力能源有限公司 | Device and method for detecting internal gas pressure of lithium ion battery |
| CN104362279B (en) * | 2014-11-17 | 2017-01-04 | 天津工业大学 | A kind of preparation method of lithium ion battery superfine fibre barrier film |
| CN204882292U (en) * | 2015-08-20 | 2015-12-16 | 湖南美特新材料科技有限公司 | Lithium ion battery electrode material heat stability analytical equipment |
| CN110376531A (en) * | 2018-12-20 | 2019-10-25 | 盐城工学院 | A kind of lithium ion battery original position production gas detection device and method |
-
2019
- 2019-11-12 CN CN201911102734.XA patent/CN110836704B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110836704A (en) | 2020-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110836704B (en) | Device for measuring internal gas production of lithium ion battery | |
| CN101718726A (en) | Device and method for measuring gas specific heat ratio | |
| CN105510174B (en) | Apparatus and method for detecting gas inside battery | |
| CN101881689A (en) | Large-capacity power lithium-ion battery sealing-performance testing equipment and test method thereof | |
| CN107907179A (en) | A kind of arbitrary shaped body volume measuring instrument | |
| CN102426081B (en) | Positive pressure detection equipment for tightness of large-capacity power lithium ion battery and detection method thereof | |
| CN109269587B (en) | Device for measuring biogas volume in laboratory and use method thereof | |
| CN204882292U (en) | Lithium ion battery electrode material heat stability analytical equipment | |
| CN112362247B (en) | Lithium ion battery pack electrolyte leakage detection device and method | |
| CN203274835U (en) | Lead-acid storage battery gas collection device | |
| CN203688053U (en) | Acid injection quantity measuring system of lead-acid storage battery | |
| CN207717304U (en) | A kind of air leakage detector | |
| CN108931280A (en) | A kind of detection device and its detection method of lithium ion battery volume | |
| CN203811329U (en) | Gas collecting device for testing sealed reaction efficiency of cell | |
| CN202002777U (en) | Sealing testing device of battery case | |
| CN208579750U (en) | With the device of gasmetry irregularly shaped object volume | |
| CN204807439U (en) | Be applicable to and water funkly be afraid of that oxygen compound carries out ultraviolet cell for fluorescence detection | |
| CN111504848A (en) | Lithium battery cathode lithium precipitation content testing device | |
| CN210810985U (en) | Skin elasticity detection device | |
| CN204008238U (en) | A kind of gas collector | |
| CN210427275U (en) | Methane measuring device | |
| CN202420779U (en) | Lithium battery leakage detection device | |
| CN202119499U (en) | Cylinder cover volume detecting device based on synchronous pressure measurement | |
| CN209085568U (en) | A kind of test soft-package battery volume devices | |
| CN206235440U (en) | A kind of ultracapacitor leak detection tool equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 336000 Yichun economic and Technological Development Zone, Jiangxi, Yichun Applicant after: Jiangxi Far East Battery Co., Ltd Address before: 336000 Yichun economic and Technological Development Zone, Yuanzhou District, Jiangxi, Yichun Applicant before: FAR EAST FIRST NEW ENERGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |