CN105044615A - Lithium battery safety detection method - Google Patents
Lithium battery safety detection method Download PDFInfo
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- CN105044615A CN105044615A CN201510480741.9A CN201510480741A CN105044615A CN 105044615 A CN105044615 A CN 105044615A CN 201510480741 A CN201510480741 A CN 201510480741A CN 105044615 A CN105044615 A CN 105044615A
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Abstract
The invention discloses a lithium battery safety detection method, comprising steps of transmitting a non-destructive detection ultrasonic signal by a lithium battery, wherein the detection ultrasonic signal penetrates and is reflected in the lithium battery, performing charge-discharge determination on the lithium battery, establishing a lithium battery charge conservation model, a quality conservation model and a electrochemical reaction dynamics model, establishing a thermal model in the working process of the lithium battery according to the electric performance and the electrochemical reaction of the model simulation lithium battery, performing 3D simulation on the thermal production process of the lithium battery to obtain a temperature changing simulation curve, performing charging and over-charging on the lithium battery, measuring the practical temperature changing curve and the voltage changing curve of the lithium battery in the processes of charging and over-charging, and detecting the safety performance of the over-charging of the lithium battery. The lithium battery safety detection method disclosed by the invention realizes a fast screening method for the lithium battery over-charging safety performance through the ultrasonic signal, charging-discharging detection and combining with the lithium battery charging safety performance detection.
Description
Technical field
The present invention relates to technical field of lithium battery detection, be specifically related to a kind of detection method of lithium battery security.
Background technology
Daily life has been benefited in the widespread use of lithium battery greatly, and its security performance is more and more subject to extensive concern.Current commercial lithium battery uses inflammable organic electrolyte mostly, has potential danger, as: combustibility, ignition propensity and explosibility.In design or in manufacturing, little battery of mobile phone if there is the fault of construction that some are potential, just may cause serious security incident, even also may even explode by initiation fire, for using lithium battery as the electric automobile of power source, safety problem needs to pay attention to more.But in recent years, the related check method of lithium battery security performance is almost unalterable, " can't check, examine inaccurate, examine unhappy " problem especially outstanding in lithium battery Safety Inspection field.
Summary of the invention
The object of the present invention is to provide a kind of detection method can carrying out the lithium battery security detected fast to lithium battery.
For achieving the above object, present invention employs following technical scheme:
A detection method for lithium battery security, comprises the following steps:
(1) two ultrasound scanner heads are attached at respectively two sides of a lithium battery; Utilize ultrasound scanner head to transmit a nondestructive detection ultrasonic signals to this lithium battery, and sense the resonance pressure wave signal from this lithium battery by these two ultrasound scanner heads, this detection ultrasonic signals system is through penetrating and reflecting in this lithium battery;
(2) with the electric current of pre-sizing, constant-current constant-voltage charging is carried out to above-mentioned lithium battery, until charge to the upper voltage limit of battery, and then constant-voltage charge is less than default value to charging current, after placing a period of time, constant-current discharge, to the lower voltage limit of battery, then according to the size of discharge time and constant-current discharge electric current, judges that whether charging and discharging is normal, if discharge and recharge is normal, then carry out next step;
(3) simplify the Complicated Pore Structures of electrode in described lithium battery according to porous medium homogenization theory, set up charge conservation model, mass conservation model and electrochemical reaction kinetic model that lithium battery is followed in the course of the work;
(4) according to described model emulation, lithium battery is charging and the electrical property in overcharge process and chemical property;
(5) based on the battery change of internal energy that electronic conduction, ionic conduction, contact resistance, electrochemical reaction and Entropy Changes in the described lithium battery course of work produce, set up in the lithium battery course of work thermal modeling, three-dimensional artificial is carried out to the exothermal process of described lithium battery, obtains temperature variation simulation curve;
(6) described lithium battery is charged and overcharge, measure temperature variation curve and the voltage change curve of lithium battery reality described in charging and overcharge process;
(7) temperature threshold in thermoelectricity detection and voltage threshold is set, described temperature variation curve is compared with described temperature threshold and described temperature variation simulation curve, and described voltage change curve is compared with described voltage threshold, detect the over-charge safety performance of described lithium battery.
Further, the judgement of the over-charge safety performance of described lithium battery comprises: if described temperature variation curve and described temperature variation simulation curve coincide, and described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets security performance requirement; If described temperature variation curve and described temperature variation simulation curve are misfitted, but described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets the inner uneven defect of existence; If described temperature variation curve and described temperature variation simulation curve is misfitted and described temperature variation curve exceedes described temperature threshold, or described voltage change curve exceedes described voltage threshold, then judge that described lithium battery does not meet security performance requirement.
As shown from the above technical solution, the present invention is detected by ultrasonic signals, discharge and recharge, and in conjunction with over-charge of lithium battery electricity security performance detection, the thermal effect of lithium battery, chemical property are connected, and introduce thermal modeling, achieve a kind of rapid screening method of over-charge safety performance of lithium battery.
Embodiment
A detection method for lithium battery security, comprises the following steps:
(1) two ultrasound scanner heads are attached at respectively two sides of a lithium battery; Utilize ultrasound scanner head to transmit a nondestructive detection ultrasonic signals to this lithium battery, and sense the resonance pressure wave signal from this lithium battery by these two ultrasound scanner heads, this detection ultrasonic signals system is through penetrating and reflecting in this lithium battery;
(2) with the electric current of pre-sizing, constant-current constant-voltage charging is carried out to above-mentioned lithium battery, until charge to the upper voltage limit of battery, and then constant-voltage charge is less than default value to charging current, after placing a period of time, constant-current discharge, to the lower voltage limit of battery, then according to the size of discharge time and constant-current discharge electric current, judges that whether charging and discharging is normal, if discharge and recharge is normal, then carry out next step;
(3) simplify the Complicated Pore Structures of electrode in described lithium battery according to porous medium homogenization theory, set up charge conservation model, mass conservation model and electrochemical reaction kinetic model that lithium battery is followed in the course of the work;
(4) according to described model emulation, lithium battery is charging and the electrical property in overcharge process and chemical property;
(5) based on the battery change of internal energy that electronic conduction, ionic conduction, contact resistance, electrochemical reaction and Entropy Changes in the described lithium battery course of work produce, set up in the lithium battery course of work thermal modeling, three-dimensional artificial is carried out to the exothermal process of described lithium battery, obtains temperature variation simulation curve;
(6) described lithium battery is charged and overcharge, measure temperature variation curve and the voltage change curve of lithium battery reality described in charging and overcharge process;
(7) temperature threshold in thermoelectricity detection and voltage threshold is set, described temperature variation curve is compared with described temperature threshold and described temperature variation simulation curve, and described voltage change curve is compared with described voltage threshold, detect the over-charge safety performance of described lithium battery.
Further, the judgement of the over-charge safety performance of described lithium battery comprises: if described temperature variation curve and described temperature variation simulation curve coincide, and described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets security performance requirement; If described temperature variation curve and described temperature variation simulation curve are misfitted, but described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets the inner uneven defect of existence; If described temperature variation curve and described temperature variation simulation curve is misfitted and described temperature variation curve exceedes described temperature threshold, or described voltage change curve exceedes described voltage threshold, then judge that described lithium battery does not meet security performance requirement.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (2)
1. a detection method for lithium battery security, is characterized in that, comprises the steps:
(1) two ultrasound scanner heads are attached at respectively two sides of a lithium battery; Utilize ultrasound scanner head to transmit a nondestructive detection ultrasonic signals to this lithium battery, and sense the resonance pressure wave signal from this lithium battery by these two ultrasound scanner heads, this detection ultrasonic signals system is through penetrating and reflecting in this lithium battery;
(2) with the electric current of pre-sizing, constant-current constant-voltage charging is carried out to above-mentioned lithium battery, until charge to the upper voltage limit of battery, and then constant-voltage charge is less than default value to charging current, after placing a period of time, constant-current discharge, to the lower voltage limit of battery, then according to the size of discharge time and constant-current discharge electric current, judges that whether charging and discharging is normal, if discharge and recharge is normal, then carry out next step;
(3) simplify the Complicated Pore Structures of electrode in described lithium battery according to porous medium homogenization theory, set up charge conservation model, mass conservation model and electrochemical reaction kinetic model that lithium battery is followed in the course of the work;
(4) according to described model emulation, lithium battery is charging and the electrical property in overcharge process and chemical property;
(5) based on the battery change of internal energy that electronic conduction, ionic conduction, contact resistance, electrochemical reaction and Entropy Changes in the described lithium battery course of work produce, set up in the lithium battery course of work thermal modeling, three-dimensional artificial is carried out to the exothermal process of described lithium battery, obtains temperature variation simulation curve;
(6) described lithium battery is charged and overcharge, measure temperature variation curve and the voltage change curve of lithium battery reality described in charging and overcharge process;
(7) temperature threshold in thermoelectricity detection and voltage threshold is set, described temperature variation curve is compared with described temperature threshold and described temperature variation simulation curve, and described voltage change curve is compared with described voltage threshold, detect the over-charge safety performance of described lithium battery.
2. the detection method of lithium battery security according to claim 1, it is characterized in that, the judgement of the over-charge safety performance of described lithium battery comprises: if described temperature variation curve and described temperature variation simulation curve coincide, and described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets security performance requirement; If described temperature variation curve and described temperature variation simulation curve are misfitted, but described temperature variation curve does not exceed described temperature threshold, described voltage change curve does not exceed described voltage threshold, then judge that described lithium battery meets the inner uneven defect of existence; If described temperature variation curve and described temperature variation simulation curve is misfitted and described temperature variation curve exceedes described temperature threshold, or described voltage change curve exceedes described voltage threshold, then judge that described lithium battery does not meet security performance requirement.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105911478A (en) * | 2016-04-19 | 2016-08-31 | 中国科学院宁波材料技术与工程研究所 | Thermal analysis method and system in charge and discharge states of aged lithium battery |
| CN106291371A (en) * | 2016-07-22 | 2017-01-04 | 中国科学院宁波材料技术与工程研究所 | A kind of lithium battery lancing test emulation mode and device |
| CN106599508A (en) * | 2016-12-26 | 2017-04-26 | 中华人民共和国上海出入境检验检疫局 | Lithium ion battery thermal runway prediction method in mobile phone operating |
| CN106706756A (en) * | 2017-02-13 | 2017-05-24 | 天津出入境检验检疫局工业产品安全技术中心 | Device and method for detecting safety of lithium ion battery for electric bicycle |
| CN117236264A (en) * | 2023-11-16 | 2023-12-15 | 华中科技大学 | Method for predicting capacity fading of stress-induced lithium ion battery |
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| CN105911478A (en) * | 2016-04-19 | 2016-08-31 | 中国科学院宁波材料技术与工程研究所 | Thermal analysis method and system in charge and discharge states of aged lithium battery |
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| CN117236264B (en) * | 2023-11-16 | 2024-01-26 | 华中科技大学 | Method for predicting capacity fading of stress-induced lithium ion battery |
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