CN104296911A - Lithium ion battery core stress measurement method and device - Google Patents
Lithium ion battery core stress measurement method and device Download PDFInfo
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- CN104296911A CN104296911A CN201410023078.5A CN201410023078A CN104296911A CN 104296911 A CN104296911 A CN 104296911A CN 201410023078 A CN201410023078 A CN 201410023078A CN 104296911 A CN104296911 A CN 104296911A
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Abstract
The invention discloses a lithium ion battery core stress measurement method and device. A to-be-tested stress test area at the inner portion and/or the outer surface of a battery core is provided with thin film pressure sensors which are fixed, and the magnitude of the stress of the to-be-tested stress test area can be obtained by reading the signal values of the thin film pressure sensors. Test is carried out on the stress of the battery core in the assembling and using process by utilizing the thin film pressure sensors, and the magnitude of the stress of the to-be-tested stress test area can be obtained by reading the signal values of the thin film pressure sensors, so that the battery core stress value is quantized. The method can measure the magnitude of the stress at any place of the battery core in the housing entering process conveniently under the condition of not changing battery production technology process condition and process flow, and can also carry out quantized measurement on the magnitude of internal pressure at each place of the battery core and internal pressure distribution conditions in the follow-up lithium ion battery preparation and using process; the internal dangerous zone can be determined; the error is small; repeatability is good; and the method and device can provide reliable basis for battery design and manufacturing process.
Description
Technical field
The present invention relates to the stressed assay method of a kind of lithium ion battery cell and device.
Background technology
In recent years; along with the attention to non-renewable energy resources crisis and environmental protection; lithium ion battery has the significant advantages such as sparking voltage is high, energy density is high, cycle life is good, environmental protection due to it; its research is in recent years paid close attention to widely and is developed rapidly, obtains application in fields such as answering mobile phone, computer, electric automobile, intelligent grid at present.
Battery core due to lithium ion battery enters that shell is stressed has vital impact to lithium battery performance, directly affect the volume energy density of lithium battery, mass energy density, enter shell complexity and subsequent short circuit rate etc., therefore battery research and development and need to enter lithium ion battery cell that shell is stressed to be measured in producing.But existing battery core enters, and shell is stressed does not have quantitative detection method, mainly enter the stressed of shell by battery core degree of tightness than carrying out reaction cell, do not consider the impact of the external factor such as housing distortion, battery core thickness deviation, the stressed size that battery core enters each position in shell process can not be quantized, drastically influence the further raising of lithium ion battery quality.Therefore be necessary to provide a kind of new lithium ion battery cell to enter shell forces testing method.
In addition, lithium ion battery can make internal pressure become large due to the expansion of pole piece after charging, thus makes inappreciable defect originally be exaggerated and become abnormally dangerous, can cause blast time serious.But in present lithium ion battery manufacture and use procedure thereof, people often have ignored the determination and analysis to internal pressure distribution situation after lithium ion cell charging, thus can not adjust the manufacture of lithium ion battery or structure in time, make the survival all the time of above-mentioned unsafe condition so far.
Summary of the invention
The object of this invention is to provide the stressed assay method of a kind of lithium ion battery cell, cannot the problem of quantitative test to solve existing battery core forces testing, a kind of proving installation using the method is provided simultaneously.
In order to realize above object, the technical scheme that the stressed assay method of lithium ion battery cell of the present invention adopts is: forces testing district to be measured that is inner in battery core and/or outside surface arranges diaphragm pressure inductor, and be fixed, the stressed size in forces testing district to be measured can be obtained by the signal value reading diaphragm pressure inductor.
Forces testing district to be measured is located in inductor one end of diaphragm pressure inductor, and the other end is connected for the data acquisition module reading diaphragm pressure inductor signal value with one.
Battery core inside and/or outside surface are provided with at least two diaphragm pressure inductors, carry out forces testing to the difference of battery core forces testing district to be measured simultaneously.
When entering shell forces testing to battery core, battery core enters the employing of shell side formula and manually enters shell.
The technical scheme that the stressed determinator of lithium ion battery cell of the present invention adopts is: comprise battery core and be arranged at the diaphragm pressure inductor in the inner and/or outside surface forces testing district to be measured of battery core.
Forces testing district to be measured is located in inductor one end of diaphragm pressure inductor, and the other end is connected for the data acquisition module reading diaphragm pressure inductor signal value with one.
Battery core inside and/or outside surface are provided with at least two are carried out forces testing simultaneously diaphragm pressure inductor to the difference of battery core forces testing district to be measured.
The battery core that the stressed assay method of lithium ion battery cell of the present invention and device adopt diaphragm pressure inductor to enter in shell process battery core is stressed tests, the stressed size in forces testing district to be measured in various process can be obtained by the signal value reading diaphragm pressure inductor, thus quantize battery core stress value.The method is under the condition of the process conditions and technological process that do not change battery manufacturing technology, battery core can be measured easily and enter the size that in shell process, any part is stressed, and error is little, favorable repeatability, for battery degree of tightness provides reliable foundation than design and manufacturing process thereof.
In addition, by placing diaphragm pressure inductor in battery core inside, also quantitative mensuration can be carried out to the internal pressure size at each position in follow-up lithium ion battery preparation, use procedure and distribution thereof, effectively reflect the pressure distribution situation of inside lithium ion cell, determine inner hazardous location, to design for lithium ion battery and manufacturing process provides reliable foundation, and then greatly can reduce the danger that lithium ion battery produces because pressure is uneven, improve the quality and performance of product.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of diaphragm pressure inductor of the present invention in battery core inside;
Fig. 2 is battery core forces testing connection diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
As shown in Figure 1, the stressed assay method of lithium ion battery cell of the present invention, that forces testing district to be measured that is inner in battery core and/or outside surface arranges diaphragm pressure inductor, and be fixed, the stressed size in forces testing district to be measured can be obtained by the signal value reading diaphragm pressure inductor, thus quantize the stressed size of battery core.
Forces testing district to be measured is located in inductor one end of diaphragm pressure inductor, and utilizes adhesive tape to be fixed, and the other end is connected for the data acquisition module reading diaphragm pressure inductor signal value with one.
The diaphragm pressure inductor thickness 0.2mm of the present embodiment, pressure limit: 0-1000N, length range: about 4-21cm, force area diameter range: 9.52-25.4mm; Battery core is the battery core assembled.
When entering shell forces testing to battery core, in battery core inside and/or outside surface, multiple diaphragm pressure inductor can be set, to realize carrying out forces testing to multiple differences of battery core forces testing district to be measured simultaneously.The battery core of the present embodiment enters the employing of shell side formula and manually enters shell.
Present invention also offers the stressed determinator of a kind of lithium ion battery cell, comprise battery core and be arranged at the diaphragm pressure inductor in the inner and/or outside surface forces testing district to be measured of battery core.
As shown in Fig. 1 ~ Fig. 2, the present embodiment the diaphragm pressure inductor chosen is placed on the battery core centre assembled carry out battery core forces testing.Diaphragm pressure inductor selects MFF diaphragm pressure inductor, and inductor thickness is 0.2mm, and length is 15cm, and stressed diameter is 20mm, and as shown in Figure 1, this battery core 5 adopts multiple positive plate 3 and negative plate 2 to assemble, and is provided with barrier film 1 between each positive and negative plate.The present embodiment is located at by two diaphragm pressure inductors 4 in the middle of barrier film 1 and negative plate 2, and with long 230mm × force area is fixed on barrier film by wide 20mm high temperature gummed tape, ensure to paste fastening, smooth, corrugationless.Diaphragm pressure inductor can certainly be placed on other different positions of battery core, each position in shell process be entered to battery core and carries out forces testing.The implementation case places diaphragm pressure inductor in battery core inside, forces testing when only entering shell to this battery core centre battery core.
Diaphragm pressure inductor is after the inner forces testing position of battery core fixes, and the other end is connected with the MFF multiple spot diaphragm pressure test macro in host computer by data acquisition module, after being demarcated, namely can start test by data acquisition module to inductor.
Battery core inside being equipped with film induction pressure device slowly enters shell, automatically can read by the host computer be connected with data acquisition module the stressed size that battery core enters middle part in shell process.As can be seen from the data that host computer reads, in this battery core loading process, battery core centre is stressed increases gradually, and increase large 62N from zero, then remain unchanged, namely battery core enters battery core centre maximum, force in shell process is 62N.According to battery core forces testing value, can be further battery degree of tightness and provide foundation than design and manufacturing process thereof.
In addition, battery core forces testing method of the present invention and device also may be used for the determination and analysis of the distribution situation to internal pressure after lithium ion cell charging, detailed process is as follows: in lithium ion battery preparation process, diaphragm pressure inductor is placed on lithium ion battery need locate just (bear) between pole piece, barrier film, and together carry out conventional lamination with other both positive and negative polarity pole pieces and barrier film, enter shell, drying, fluid injection, sealing, constant volume, be prepared into lithium ion battery.The other end extension line of diaphragm pressure inductor is connected with data acquisition module, can read pressure and distribution situation thereof that battery core enters each position of inside lithium ion cell in shell, fluid injection, constant volume, charge and discharge process.
Short circuit can not be caused in preparation process for making diaphragm pressure inductor, the components and parts that diaphragm pressure inductor and wire thereof should select insulativity good, or diaphragm pressure inductor and wire are sealed by conventional insulation film, the battery core preparation of lithium ion battery can not be affected like this, do not affect by extraneous factor when can ensure again test; Diaphragm pressure inductor should be thin as far as possible, could not affect the preparation of lithium ion battery cell.
As shown in Figure 2, in practical operation, diaphragm pressure inductor is placed on the inner optional position of battery core 5, also can carry out internal pressure test to different parts as required simultaneously, but when diaphragm pressure inductor other end lead-in wire seals with lug 6 or seals with sealing compound, rear air tight, the no leakage of heat-sealing should be guaranteed.After diaphragm pressure inductor other side extension line is connected with diaphragm pressure test macro, by data acquisition module, lithium ion battery just can be read in each stage internal pressure size; By the piezometry to different parts, just can know which site pressure of inside lithium ion cell is maximum, by the mensuration to internal pressure after different charged state and cycle index, just know the pressure change of inside lithium ion cell under different conditions, thus achieve the quantitative test to the internal pressure situation of change in lithium ion battery preparation and use procedure.
Above embodiment is only for explaining the present invention; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (7)
1. the stressed assay method of lithium ion battery cell, it is characterized in that: forces testing district to be measured that is inner in battery core and/or outside surface arranges diaphragm pressure inductor, and be fixed, the stressed size in forces testing district to be measured can be obtained by the signal value reading diaphragm pressure inductor.
2. the stressed assay method of lithium ion battery cell according to claim 1, it is characterized in that: forces testing district to be measured is located in inductor one end of diaphragm pressure inductor, and the other end is connected for the data acquisition module reading diaphragm pressure inductor signal value with one.
3. the stressed assay method of lithium ion battery cell according to claim 1 and 2, is characterized in that: battery core inside and/or outside surface are provided with at least two diaphragm pressure inductors, carry out forces testing to the difference of battery core forces testing district to be measured simultaneously.
4. the stressed assay method of lithium ion battery cell according to claim 1, is characterized in that: when entering shell forces testing to battery core, and battery core enters the employing of shell side formula and manually enters shell.
5. the stressed determinator of lithium ion battery cell, is characterized in that: comprise battery core and be arranged at the diaphragm pressure inductor in the inner and/or outside surface forces testing district to be measured of battery core.
6. the stressed determinator of lithium ion battery cell according to claim 5, it is characterized in that: forces testing district to be measured is located in inductor one end of diaphragm pressure inductor, and the other end is connected for the data acquisition module reading diaphragm pressure inductor signal value with one.
7. the stressed determinator of the lithium ion battery cell according to claim 5 or 6, is characterized in that: battery core inside and/or outside surface are provided with at least two are carried out forces testing simultaneously diaphragm pressure inductor to the difference of battery core forces testing district to be measured.
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| CN201410023078.5A CN104296911A (en) | 2014-01-17 | 2014-01-17 | Lithium ion battery core stress measurement method and device |
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| CN201410023078.5A CN104296911A (en) | 2014-01-17 | 2014-01-17 | Lithium ion battery core stress measurement method and device |
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Cited By (8)
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| CN106405422A (en) * | 2015-07-27 | 2017-02-15 | 宁德新能源科技有限公司 | Lithium ion battery pole piece expanding fracture test method |
| CN107946656A (en) * | 2017-11-30 | 2018-04-20 | 中航锂电（江苏）有限公司 | Lithium battery overlay film system |
| CN108448173A (en) * | 2018-04-30 | 2018-08-24 | 中航锂电（江苏）有限公司 | Lithium battery enters shell systems |
| CN109540713A (en) * | 2018-12-29 | 2019-03-29 | 广东天劲新能源科技股份有限公司 | A kind of test device of battery core hardness |
| CN109764991A (en) * | 2018-12-24 | 2019-05-17 | 超威电源有限公司 | The method for testing lead-acid accumulator assembling pressure |
| CN111610093A (en) * | 2020-05-27 | 2020-09-01 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery roll core |
| CN112557931A (en) * | 2019-09-10 | 2021-03-26 | 中国科学院苏州纳米技术与纳米仿生研究所 | Device and method for detecting health degree of metal lithium battery |
| DE102022203196A1 (en) | 2022-03-31 | 2023-10-05 | Vitesco Technologies GmbH | Method for determining the functionality of a pressure sensor and battery arrangement |
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| CN108448173A (en) * | 2018-04-30 | 2018-08-24 | 中航锂电（江苏）有限公司 | Lithium battery enters shell systems |
| CN109764991A (en) * | 2018-12-24 | 2019-05-17 | 超威电源有限公司 | The method for testing lead-acid accumulator assembling pressure |
| CN109540713A (en) * | 2018-12-29 | 2019-03-29 | 广东天劲新能源科技股份有限公司 | A kind of test device of battery core hardness |
| CN112557931A (en) * | 2019-09-10 | 2021-03-26 | 中国科学院苏州纳米技术与纳米仿生研究所 | Device and method for detecting health degree of metal lithium battery |
| CN112557931B (en) * | 2019-09-10 | 2024-04-09 | 中国科学院苏州纳米技术与纳米仿生研究所 | Device and method for detecting health degree of metal lithium battery |
| CN111610093A (en) * | 2020-05-27 | 2020-09-01 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery roll core |
| CN111610093B (en) * | 2020-05-27 | 2022-11-18 | 梅州市量能新能源科技有限公司 | Method for detecting tightness of lithium ion battery winding core |
| DE102022203196A1 (en) | 2022-03-31 | 2023-10-05 | Vitesco Technologies GmbH | Method for determining the functionality of a pressure sensor and battery arrangement |
| DE102022203196B4 (en) | 2022-03-31 | 2024-02-29 | Vitesco Technologies GmbH | Method for determining the functionality of a pressure sensor and battery arrangement |
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Effective date of registration: 20160222 Address after: 213299 Jintan Road, Jintan District, Jiangsu, No. 88, No. Applicant after: Air lithium (Jiangsu) Co. Ltd. Address before: 471003 Henan city of Luoyang province high tech Development Zone Binhe Road No. 66 Applicant before: China Aviation Lithium Battery Co., Ltd. |
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Application publication date: 20150121 |
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