CN102868003A - Device and method for detecting internal gas pressure of lithium ion battery - Google Patents

Device and method for detecting internal gas pressure of lithium ion battery Download PDF

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Publication number
CN102868003A
CN102868003A CN2012103102652A CN201210310265A CN102868003A CN 102868003 A CN102868003 A CN 102868003A CN 2012103102652 A CN2012103102652 A CN 2012103102652A CN 201210310265 A CN201210310265 A CN 201210310265A CN 102868003 A CN102868003 A CN 102868003A
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CN
China
Prior art keywords
mesuring battary
lithium ion
battery
gas pressure
venting cavity
Prior art date
Application number
CN2012103102652A
Other languages
Chinese (zh)
Inventor
刘成士
王晨旭
宫璐
张艳霞
谢佳
Original Assignee
合肥国轩高科动力能源有限公司
Priority date (The priority date 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 date listed.)
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Application filed by 合肥国轩高科动力能源有限公司 filed Critical 合肥国轩高科动力能源有限公司
Priority to CN2012103102652A priority Critical patent/CN102868003A/en
Publication of CN102868003A publication Critical patent/CN102868003A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a device and a method for detecting the internal gas pressure of a lithium ion battery. The internal gas pressure of the lithium ion battery is detected according to a Boyle law setting equation: P1*V1=P2*(V1+delta V), wherein P1 and V1 represent the original internal pressure and volume of the battery, and P2 and delta V respectively represent the gas pressure of the air-exhausted battery and gas volume variation; and the P2 and the delta V are measured by using the device provided by the invention, and then the V1 is measured, so the P1 can be calculated. By the invention, the internal gas pressure of the battery can be detected through the structure of a U-shaped pipe. The invention has the advantages of simple structure and convenience for measurement, the internal gas pressure of the lithium ion battery can be effectively detected in real time, design of the structure of a battery body and a safety valve is guided, and great significance is provided for elimination of potential safety hazards of the lithium ion battery.

Description

Inside lithium ion cell gas pressure detection unit and method

Technical field

The present invention relates to the lithium ion battery field, relate in particular to a kind of inside lithium ion cell gas pressure detection unit and method.

Background technology

Along with the problem that energy shortage and ambient pressure bring, lithium ion battery will be widely used, electric automobile industry particularly, and lithium ion battery will be widely used, so aobvious being even more important of its security performance.Lithium ion battery is an airtight reaction vessel, there be decomposition reaction, electrolyte and negative reaction, electrolyte and the anodal reaction of electrolyte in inside battery, under some abuse conditions and under the particular surroundings, these reactions all can aggravate especially, such as overcharge, mistake is put, under short circuit and the hot environment, these react aggravation, produce a large amount of gas, the gathering of gas causes the interior voltage rise of battery high, if can not in time discharge, explosion phenomenon to occur, security incident will occur.All be to use explosion-proof valve to solve this problem at present in the industry, but the design of the limiting pressure of explosion-proof valve must be in safe range, the too high then inside battery of limiting pressure gas can not in time be discharged and be caused battery explosion, limiting pressure is crossed to hang down and then can be caused the battery premature failure again, reduces battery.Therefore measure the inside battery gas pressure extremely important.

Summary of the invention

The object of the invention is exactly in order to remedy the defective of prior art, a kind of inside lithium ion cell gas pressure detection unit and method to be provided.

The present invention is achieved by the following technical solutions:

A kind of inside lithium ion cell gas pressure detection unit, include U-shaped pipe and means of deflation that inside is placed with liquid, described means of deflation includes, lower battery clamping plate, mesuring battary is placed between the two battery clamping plate, fix by screw rod between the two battery clamping plate, described mesuring battary top is fixed with the venting cavity, the venting cavity passes described upper battery clamping plate and is tightly connected with upper battery clamping plate, described venting cavity bottom is air inlet, the side is provided with the gas outlet, end sealing, the gas outlet is connected with the right cavity of described U-shaped pipe by tracheae, the gas outlet upside is placed with piston in the venting cavity, also be placed with the bundle vent needle in the venting cavity, the most advanced and sophisticated contact measured battery of described bundle vent needle top is used for pricking the hole at mesuring battary, the bundle vent needle other end passes piston and venting cavity top and is fixed on the handle, and described handle is supported and driven the bundle vent needle and moves up and down by bracing frame.

A kind of inside lithium ion cell gas pressure detection method that adopts said apparatus to carry out comprises the steps:

(1) driving the bundle vent needle by handle moves down, the acupuncture treatment hole is pricked at mesuring battary aperture, gas in the mesuring battary enters in the venting cavity and from the gas outlet and enters in the right cavity of arranging U-shaped pipe in the tracheae, until the liquid level on both sides is static in the U-shaped pipe, recording the liquid level difference is h, air pressure inside P2=P0+ ρ gh after the mesuring battary exhaust, inside battery gas volume variation delta V=1/2hS, wherein P0 is atmospheric pressure, and ρ is U-shaped liquid in pipe density, and S is that U-shaped tube section is long-pending;

(2) taking-up of the mesuring battary after the exhaust is weighed, be designated as W1, mesuring battary is put in the container that fills with organic solvent, and fully submergence, container is put into vacuum tank, constantly vacuumize, the gas volume of discharging in the filled with organic solvent mesuring battary, take out mesuring battary and the organic solvent on surface is removed clean and weighed be designated as W2, the gas volume that mesuring battary is discharged is V1=(W2-W1)/ρ 1, ρ 1 is organic solvent density;

(3) according to Boyle's law P1V1=P2(V1+ Δ V), calculate gas interior pressure P 1 to be measured.

Described inside lithium ion cell gas pressure detection unit is characterized in that: be respectively equipped with upper and lower sealing gasket between the above and below of described mesuring battary and the upper and lower battery clamping plate.

Described inside lithium ion cell gas pressure detection unit is characterized in that: described venting cavity diameter is 10 to 30mm, and material is stainless steel; Described bundle vent needle syringe needle diameter is 1 to 2mm, and material is stainless steel.

Described inside lithium ion cell gas pressure detection unit is characterized in that: the liquid in the described U-shaped pipe is ethanol, ethyl acetate.

Advantage of the present invention is: the structure of the present invention by U-shaped pipe realized the detection to inside battery air pressure, simple in structure, it is convenient to measure, and realize detecting the inside lithium ion cell gas pressure is real-time, effective, guidance plays an important role to eliminating the lithium ion battery potential safety hazard to the design of lithium ion battery body construction and safety valve.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is the enlarged drawing of means of deflation among the present invention.

Embodiment

Such as Fig. 1, shown in 2, a kind of inside lithium ion cell gas pressure detection unit, include U-shaped pipe 3 and means of deflation 1 that inside is placed with liquid, described means of deflation 1 includes, lower battery clamping plate 5,6, mesuring battary 4 is placed between the two battery clamping plate, fixing by screw rod 7 between the two battery clamping plate, described mesuring battary 4 tops are fixed with venting cavity 8, venting cavity 8 passes described upper battery clamping plate 5 and is tightly connected with upper battery clamping plate 5, described venting cavity 8 bottoms are air inlet, the side is provided with the gas outlet, end sealing, the gas outlet is connected with described U-shaped pipe 3 right cavitys by tracheae 2, and venting cavity 8 interior gas outlet upsides are placed with piston 9, also is placed with in the venting cavity 8 and pricks vent needle 10, described bundle vent needle 10 most advanced and sophisticated contact measured batteries 4 tops, be used for pricking the hole at mesuring battary 4, bundle vent needle 10 other ends pass piston 9 and venting cavity 8 tops and are fixed on the handle 11, and described handle 11 supports and drives bundle vent needle 10 by bracing frame 12 and moves up and down.

A kind of inside lithium ion cell gas pressure detection method that adopts said apparatus to carry out comprises the steps:

(1) driving bundle vent needle 10 by handle 11 moves down, acupuncture treatment hole 10 is pricked at mesuring battary 4 aperture, gas in the mesuring battary 4 enters in the venting cavity 8 and enters tracheae 2 interior rows from the gas outlet to advance in the right cavity of U-shaped pipe 3, until the liquid level on U-shaped pipe 3 interior both sides is static, recording the liquid level difference is h, air pressure inside P2=P0+ ρ gh after mesuring battary 4 exhausts, inside battery gas volume variation delta V=1/2hS, wherein P0 is atmospheric pressure, ρ is U-shaped liquid in pipe density, and S is that U-shaped tube section is long-pending;

(2) taking-up of the mesuring battary after the exhaust is weighed, be designated as W1, mesuring battary 4 is put in the container that fills with organic solvent, and fully submergence, container is put into vacuum tank, constantly vacuumize, the gas volume of discharging in the filled with organic solvent mesuring battary, take out mesuring battary and the organic solvent on surface is removed clean and weighed be designated as W2, the gas volume that mesuring battary is discharged is V1=(W2-W1)/ρ 1, ρ 1 is organic solvent density;

(3) according to Boyle's law P1V1=P2(V1+ Δ V), calculate gas interior pressure P 1 to be measured.

Described inside lithium ion cell gas pressure detection unit is characterized in that: be respectively equipped with upper and lower sealing gasket 13 between the above and below of described mesuring battary 4 and the upper and lower battery clamping plate 5,6.

Described inside lithium ion cell gas pressure detection unit is characterized in that: described venting cavity 8 diameters are 10 to 30mm, and material is stainless steel; Described bundle vent needle 10 syringe needle diameters are 1 to 2mm, and material is stainless steel.

Described inside lithium ion cell gas pressure detection unit is characterized in that: the liquid in the described U-shaped pipe 3 is ethanol, ethyl acetate.

Claims (5)

1. inside lithium ion cell gas pressure detection unit, it is characterized in that: include U-shaped pipe and means of deflation that inside is placed with liquid, described means of deflation includes, lower battery clamping plate, mesuring battary is placed between the two battery clamping plate, fix by screw rod between the two battery clamping plate, described mesuring battary top is fixed with the venting cavity, the venting cavity passes described upper battery clamping plate and is tightly connected with upper battery clamping plate, described venting cavity bottom is air inlet, the side is provided with the gas outlet, end sealing, the gas outlet is connected with the right cavity of described U-shaped pipe by tracheae, the gas outlet upside is placed with piston in the venting cavity, also be placed with the bundle vent needle in the venting cavity, the most advanced and sophisticated contact measured battery of described bundle vent needle top, the bundle vent needle other end passes piston and venting cavity top and is fixed on the handle, and described handle is supported and is driven the bundle vent needle and moves up and down by bracing frame.
2. an inside lithium ion cell gas pressure detection method that adopts device claimed in claim 1 to carry out is characterized in that: comprise the steps:
(1) driving the bundle vent needle by handle moves down, the acupuncture treatment hole is pricked at mesuring battary aperture, gas in the mesuring battary enters in the venting cavity and from the gas outlet and enters in the right cavity of arranging U-shaped pipe in the tracheae, until the liquid level on both sides is static in the U-shaped pipe, recording the liquid level difference is h, air pressure inside P2=P0+ ρ gh after the mesuring battary exhaust, inside battery gas volume variation delta V=1/2hS, wherein P0 is atmospheric pressure, and ρ is U-shaped liquid in pipe density, and S is that U-shaped tube section is long-pending;
(2) taking-up of the mesuring battary after the exhaust is weighed, be designated as W1, mesuring battary is put in the container that fills with organic solvent, and fully submergence, container is put into vacuum tank, constantly vacuumize, the gas volume of discharging in the filled with organic solvent mesuring battary, take out mesuring battary and the organic solvent on surface is removed clean and weighed be designated as W2, the gas volume that mesuring battary is discharged is V1=(W2-W1)/ρ 1, ρ 1 is organic solvent density;
(3) according to Boyle's law P1V1=P2(V1+ Δ V), calculate gas interior pressure P 1 to be measured.
3. inside lithium ion cell gas pressure detection unit according to claim 1 is characterized in that: be respectively equipped with upper and lower sealing gasket between the above and below of described mesuring battary and the upper and lower battery clamping plate.
4. inside lithium ion cell gas pressure detection unit according to claim 1 is characterized in that: described venting cavity diameter is 10 to 30mm, and material is stainless steel; Described bundle vent needle syringe needle diameter is 1 to 2mm, and material is stainless steel.
5. inside lithium ion cell gas pressure detection unit according to claim 1 is characterized in that: the liquid in the described U-shaped pipe is ethanol, ethyl acetate.
CN2012103102652A 2012-08-28 2012-08-28 Device and method for detecting internal gas pressure of lithium ion battery CN102868003A (en)

Priority Applications (1)

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CN2012103102652A CN102868003A (en) 2012-08-28 2012-08-28 Device and method for detecting internal gas pressure of lithium ion battery

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105445667A (en) * 2015-11-23 2016-03-30 山东精工电子科技有限公司 Soft packaged lithium ion battery formation gas production testing device
CN106525190A (en) * 2016-12-30 2017-03-22 山东精工电子科技有限公司 Device for detecting gas production rate of cylindrical lithium ion battery and application method thereof
CN106876817A (en) * 2016-12-21 2017-06-20 杭州伯坦科技工程有限公司 Detect the method and inside battery pressure detection piece of inside battery pressure
CN109186846A (en) * 2018-09-20 2019-01-11 南开大学 Multi-purpose battery produces gas in situ detection analytical equipment
CN110470424A (en) * 2019-07-25 2019-11-19 清华大学 The experimental method of in situ measurement inside battery pressure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916652A (en) * 2006-07-25 2007-02-21 天津力神电池股份有限公司 Method for detecting gas production rate inside lithium ion battery, and detection 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
JP2009152071A (en) * 2007-12-20 2009-07-09 Ntt Facilities Inc Battery monitor, sealed battery, and sealed battery pack
CN102324588A (en) * 2011-06-03 2012-01-18 江西长河新电池有限公司 Equipment for detecting pressure inside cylindrical lithium ion battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916652A (en) * 2006-07-25 2007-02-21 天津力神电池股份有限公司 Method for detecting gas production rate inside lithium ion battery, and detection device
JP2009152071A (en) * 2007-12-20 2009-07-09 Ntt Facilities Inc Battery monitor, sealed battery, and sealed battery pack
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
CN102324588A (en) * 2011-06-03 2012-01-18 江西长河新电池有限公司 Equipment for detecting pressure inside cylindrical lithium ion battery

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105445667A (en) * 2015-11-23 2016-03-30 山东精工电子科技有限公司 Soft packaged lithium ion battery formation gas production testing device
CN106876817A (en) * 2016-12-21 2017-06-20 杭州伯坦科技工程有限公司 Detect the method and inside battery pressure detection piece of inside battery pressure
CN106876817B (en) * 2016-12-21 2019-04-12 杭州伯坦科技工程有限公司 Detect the method and inside battery pressure detection piece of inside battery pressure
CN106525190A (en) * 2016-12-30 2017-03-22 山东精工电子科技有限公司 Device for detecting gas production rate of cylindrical lithium ion battery and application method thereof
CN109186846A (en) * 2018-09-20 2019-01-11 南开大学 Multi-purpose battery produces gas in situ detection analytical equipment
CN109186846B (en) * 2018-09-20 2020-10-13 南开大学 Multipurpose battery gas production in-situ detection and analysis device
CN110470424A (en) * 2019-07-25 2019-11-19 清华大学 The experimental method of in situ measurement inside battery pressure

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Address after: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China

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Application publication date: 20130109