CN103344920A - Method and equipment for detecting state of health of battery - Google Patents
Method and equipment for detecting state of health of battery Download PDFInfo
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- CN103344920A CN103344920A CN2013102724588A CN201310272458A CN103344920A CN 103344920 A CN103344920 A CN 103344920A CN 2013102724588 A CN2013102724588 A CN 2013102724588A CN 201310272458 A CN201310272458 A CN 201310272458A CN 103344920 A CN103344920 A CN 103344920A
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Abstract
The invention provides a method for detecting the state of health of a battery. The method comprises the steps that the internal pressure of the battery is detected; the SOH of the battery is obtained from a corresponding relation generated in advance according to the internal pressure of the battery; the corresponding relation is the corresponding relation between the SOH and the internal pressure of the battery. The invention further provides equipment for detecting the state of health of the battery. According to the technical scheme, the improvement of detection accuracy of the SOH of the battery is achieved.
Description
[technical field]
The present invention relates to the battery detecting field, relate in particular to a kind of method and apparatus that detects cell health state.
[background technology]
Maturation day by day along with the lithium-ion electric pool technology, and lithium ion battery has advantage such as have extended cycle life, quickly-chargeable discharge, security performance are good, the application of lithium ion battery also more and more widely is mainly used in traffic, the communications field, as automobile, mobile phone, notebook computer etc.
Lithium ion battery is as energy-storage units, the cell health state of lithium ion battery (State of Health in actual use, SOH) aspects such as maintenance, replacing and maintenance for product have vital role, and estimating state of health of battery is very important for the rational Application of battery accurately.
The method of estimating state of health of battery is at present: set up the internal resistance of cell, battery charge state (SOC, State of Charge), the corresponding relation between temperature, the SOH, when proposing the request of estimation SOH, carry out the estimation of temperature survey and SOC, and the interior resistance value of detection battery, from corresponding relation, read the SOH value corresponding with the battery internal resistance value of measuring temperature, the battery SOC of estimating and detect.
The method of above-mentioned estimating state of health of battery has certain accuracy for particular battery, but the internal resistance of lithium ion battery does not change or changes and do not have evident regularity under a lot of situations, and influence each other more significantly between temperature, electric current, the battery in the actual use, therefore utilize the error of SOH value of the battery that this method obtains very big; Simultaneously, this method need be handled the relation between internal resistance, SOC, temperature and many parameters of SOH, so estimation process is more loaded down with trivial details, and the implementation procedure more complicated is when battery occurs can not in time providing the battery abnormity early warning when unusual; When battery overcharges or crosses when putting the lamp abnormal conditions, can't analyze the variation of SOH by internal resistance, may provide the indication of battery health on the contrary.
[summary of the invention]
In view of this, the embodiment of the invention provides a kind of method and apparatus that detects cell health state, improves the detection accuracy rate of the SOH of battery with realization.
First aspect, the embodiment of the invention provide a kind of method that detects cell health state, comprising:
Detect the inner pressure of battery of battery;
From the corresponding relation that generates in advance, obtain the cell health state SOH of battery according to described inner pressure of battery; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
In first kind of first aspect possible implementation, before the inner pressure of battery of described detection battery, this method also comprises:
Described battery is carried out charge-discharge test under the preset temperature;
The SOH that behind described charge-discharge test, obtains battery according to discharge capacity and the initial capacity of battery, and generate the corresponding relation of described SOH and time;
The inner pressure of battery of battery when detecting charge-discharge test, and generate inner pressure of battery and the curvilinear characteristic of time;
SOH and the corresponding relation of time and the curvilinear characteristic of described inner pressure of battery and time according to described battery obtain the SOH of battery and the corresponding relation of inner pressure of battery.
In first kind of first aspect or first aspect possible implementation, described battery is lithium ion battery.
Second aspect, the embodiment of the invention provide a kind of equipment that detects cell health state, comprising:
Pressure transducer is for detection of the inner pressure of battery of battery;
Pick-up unit is used for according to the cell health state SOH of the detected inner pressure of battery of described pressure transducer from the corresponding relation acquisition battery of generation in advance; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
In first kind of second aspect possible implementation, this equipment comprises:
The corresponding relation generating apparatus is used for described battery is carried out charge-discharge test under the preset temperature, the SOH that behind described charge-discharge test, obtains battery according to discharge capacity and the initial capacity of battery, and generate the corresponding relation of described SOH and time; The inner pressure of battery of battery when detecting charge-discharge test, and generate inner pressure of battery and the curvilinear characteristic of time; SOH and the corresponding relation of time and the curvilinear characteristic of described inner pressure of battery and time according to described battery obtain the SOH of battery and the corresponding relation of inner pressure of battery.
In first kind of second aspect or second aspect possible implementation, described battery is lithium ion battery.
As can be seen from the above technical solutions, the present invention has following beneficial effect:
When needs obtain the SOH of battery, only need to detect inner pressure of battery, then according to inner pressure of battery and generate the SOH of battery and the corresponding relation of inner pressure of battery in advance, just can obtain the SOH of battery, therefore, the testing process of SOH is simple, and detected SOH is subjected to the influence of extraneous factors such as temperature, multiplying power less, makes that the accuracy rate of SOH of detected battery is higher; And, when abnormal conditions appear in battery, can be judged accurately in time that according to detected SOH in time provide the battery abnormity early warning, reliability is higher.
[description of drawings]
Fig. 1 is the functional block diagram of the equipment of the detection cell health state that provides of the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the method for the detection cell health state that provides of the embodiment of the invention.
[embodiment]
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Lithium ion battery in use, battery capacity can descend gradually, cell health state variation gradually just, reason mainly is because the chemical side reactions that produces in the battery use can consume active lithium ion, and chemical side reactions can produce gas, minimizing along with lithium ion active in the lithium ion battery, the gas that inside battery produces is more and more, battery case is subjected to the pressure of internal gas and produces distortion, therefore utilize battery inner pressure of battery in the cyclic process of charging and discharging to increase gradually, the characteristics that battery capacity descends gradually, by pressing in the test battery, obtain the SOH of battery; Wherein, the SOH of battery equals the discharge capacity of battery divided by the initial capacity of battery, and the total volume of battery when the initial capacity of described battery refers to new battery is along with the increase of cycle index, the discharge capacity of battery reduces gradually, will be less than the initial capacity of battery.
The embodiment of the invention provides a kind of equipment that detects cell health state, and Fig. 1 is the functional block diagram of the equipment of the detection cell health state that provides of the embodiment of the invention, and as shown in Figure 1, this equipment comprises:
Pressure transducer 101 is for detection of the inner pressure of battery of battery;
Pick-up unit 102 is used for according to the cell health state SOH of described pressure transducer 101 detected inner pressure of battery from the corresponding relation acquisition battery of generation in advance; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
This equipment comprises:
Corresponding relation generating apparatus 103 is used for described battery is carried out charge-discharge test under the preset temperature, the SOH that behind described charge-discharge test, obtains battery according to discharge capacity and the initial capacity of battery, and generate the corresponding relation of described SOH and time; The inner pressure of battery of battery when detecting charge-discharge test, and generate inner pressure of battery and the curvilinear characteristic of time; SOH and the corresponding relation of time and the curvilinear characteristic of described inner pressure of battery and time according to described battery obtain the SOH of battery and the corresponding relation of inner pressure of battery.
Wherein, described battery is lithium ion battery.
The embodiment of the invention gives a kind of method that detects cell health state, and Fig. 2 is the schematic flow sheet of the method for the detection cell health state that provides of the embodiment of the invention, and as shown in Figure 2, this method may further comprise the steps:
Step S201, the inner pressure of battery of detection battery.
Concrete, when needs obtain the SOH of certain battery, at this battery surface pressure transducer being set, pressure transducer detects the inner pressure of battery of this battery periodically according to predetermined period, then detected inner pressure of battery is sent to pick-up unit.
Step S202 is according to the cell health state SOH of described inner pressure of battery acquisition battery from the corresponding relation that generates in advance; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
Concrete, after pick-up unit is received the inner pressure of battery of pressure transducer transmission, according to the SOH of the battery of storing in advance in the memory device and the corresponding relation of inner pressure of battery, obtain the SOH of this inner pressure of battery correspondence.
In the technique scheme of the embodiment of the invention, described battery is lithium ion battery.
Wherein, the method for the corresponding relation of the SOH of corresponding relation generating apparatus generation battery and inner pressure of battery is:
At battery surface pressure transducer is set, utilize charge and discharge device that this battery is carried out loop test under the preset temperature then, charge and discharge device finishes the back deducts battery with the initial capacity of battery residual capacity at loop test, obtain the discharge capacity of battery, use the discharge capacity of battery divided by the initial capacity of battery again, obtain the SOH that this loop test finishes the back battery, according to this SOH and current time, generate SOH and the corresponding relation of time; So, charge and discharge device carries out loop test according to default cycle index to battery, all obtains the corresponding relation of corresponding SOH and time after each loop test finishes, and after all loop tests finish, will obtain the corresponding relation of a series of SOH and time.
Simultaneously, the pressure transducer of battery surface setting detects inner pressure of battery in real time, after all loop tests finish, and pressure transducer output inner pressure of battery and the curvilinear characteristic of time.
According to the SOH of battery and the corresponding relation of time, utilize the time in the corresponding relation to obtain corresponding inner pressure of battery of this time from inner pressure of battery and the curvilinear characteristic of time, thereby obtain the SOH of battery of this time correspondence and the corresponding relation of inner pressure of battery, the SOH of the battery that generates and the corresponding relation of inner pressure of battery are saved in memory device.
Can carry out loop test at different batteries, obtaining at the SOH of this battery and the corresponding relation of inner pressure of battery, so, when detecting the SOH of certain battery, only need get final product according to the SOH of this battery and the SOH of the corresponding relation acquisition battery of inner pressure of battery.
Wherein, mainly be that the battery that carries out under normal temperature and 45 degrees centigrade is assessed during the application of assessment battery in the lithium battery field, and, in the communications field of lithium battery applications, normal temperature and 45 degrees centigrade are representative temperature, can carry out simultaneously the loop test of battery according to the temperature of special application scenarios and requirement definition correspondence, preset temperature is normal temperature or 45 degrees centigrade among the present invention.
Wherein, described loop test refers to charge and discharge device and earlier battery is charged, and then to battery discharge, repeats the process several times that battery charge is discharged again; For example, charge and discharge device with the 50A constant current with battery charge to 3.6V, battery is shelved 5 minutes then, charge and discharge device with the 50A constant current with battery discharge to 2.0V, battery shelved 5 minutes after, repeat said process, cycle index is 3000 times.
Need to prove: battery in use, subsidiary reaction can take place in the electrolytic solution of battery and both positive and negative polarity starting material, the main cause of Here it is battery life decay, and SOH is exactly the parameter of assessment battery life; Simultaneously, battery is the integral body of a sealing, when in the side-reaction consumes battery that inside battery takes place during active substance, can supervene gas, and these gases can't be got rid of, and will cause inner pressure of battery to raise, thereby the pressure on battery surface just raise; By the gas flow of judging that inside battery produces, infer that active substance participates in the amount of subsidiary reaction in the battery, thereby judge to also have how many available active substances in the battery namely how many capacity battery can also emit, just the SOH of battery.When abnormal conditions appear in battery, for example short circuit, active substance can decompose fast, thus moment produce a large amount of gases, can bring the blast equivalent risk on fire of battery, at this moment pick-up unit can give warning in advance, safety coefficient is higher.
Described battery is lithium ion battery, and described lithium ion battery comprises rectangular lithium ion battery and flexible packing lithium ion battery; Described rectangular lithium ion battery is rectangular lithium ion battery or square lithium ion battery, as square 50Ah box hat lithium ion battery, square 200Ah aluminum hull lithium ion battery etc.; Flexible packing lithium ion battery is the lithium ion battery that shell adopts hard plastic film material, as battery of mobile phone, polymer battery etc.
Technical scheme of the present invention has following beneficial effect:
When needs obtain the SOH of battery, only need to detect inner pressure of battery, then according to inner pressure of battery and generate the SOH of battery and the corresponding relation of inner pressure of battery in advance, just can obtain the SOH of battery, therefore, implementation procedure is simple, handled easily, be subjected to the influence of extraneous factors such as temperature, multiplying power less, make that the accuracy rate of SOH of detected battery is higher; And, when abnormal conditions appear in battery, can be judged accurately in time that according to detected SOH in time provide the battery abnormity early warning, reliability is higher.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. a method that detects cell health state is characterized in that, this method comprises:
Detect the inner pressure of battery of battery;
From the corresponding relation that generates in advance, obtain the cell health state SOH of battery according to described inner pressure of battery; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
2. method according to claim 1 is characterized in that, before the inner pressure of battery of described detection battery, this method also comprises:
Described battery is carried out charge-discharge test under the preset temperature;
The SOH that behind described charge-discharge test, obtains battery according to discharge capacity and the initial capacity of battery, and generate the corresponding relation of described SOH and time;
The inner pressure of battery of battery when detecting charge-discharge test, and generate inner pressure of battery and the curvilinear characteristic of time;
SOH and the corresponding relation of time and the curvilinear characteristic of described inner pressure of battery and time according to described battery obtain the SOH of battery and the corresponding relation of inner pressure of battery.
3. method according to claim 1 and 2 is characterized in that, described battery is lithium ion battery.
4. an equipment that detects cell health state is characterized in that, this equipment comprises:
Pressure transducer is for detection of the inner pressure of battery of battery;
Pick-up unit is used for according to the cell health state SOH of the detected inner pressure of battery of described pressure transducer from the corresponding relation acquisition battery of generation in advance; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
5. equipment according to claim 4 is characterized in that, this equipment comprises:
The corresponding relation generating apparatus is used for described battery is carried out charge-discharge test under the preset temperature, the SOH that behind described charge-discharge test, obtains battery according to discharge capacity and the initial capacity of battery, and generate the corresponding relation of described SOH and time; The inner pressure of battery of battery when detecting charge-discharge test, and generate inner pressure of battery and the curvilinear characteristic of time; SOH and the corresponding relation of time and the curvilinear characteristic of described inner pressure of battery and time according to described battery obtain the SOH of battery and the corresponding relation of inner pressure of battery.
6. according to claim 4 or 5 described equipment, it is characterized in that described battery is lithium ion battery.
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| CN201310272458.8A CN103344920B (en) | 2013-07-01 | 2013-07-01 | A kind of method and apparatus that detects cell health state |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760493A (en) * | 2014-01-17 | 2014-04-30 | 安徽江淮汽车股份有限公司 | Detecting method and system for health state of extended-range electric vehicle power battery |
| CN104569844A (en) * | 2014-12-31 | 2015-04-29 | 浙江大学宁波理工学院 | Valve control seal type lead-acid storage battery health condition monitoring method |
| CN104808152A (en) * | 2014-01-24 | 2015-07-29 | 通用汽车环球科技运作有限责任公司 | Systems and methods for determining battery state information based on internal battery pressure |
| CN105572598A (en) * | 2016-01-29 | 2016-05-11 | 宇龙计算机通信科技(深圳)有限公司 | Battery expansion detecting method and terminal |
| CN106569143A (en) * | 2016-11-11 | 2017-04-19 | 常州普莱德新能源电池科技有限公司 | Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle |
| CN106842065A (en) * | 2017-04-10 | 2017-06-13 | 北京新能源汽车股份有限公司 | Method and device for acquiring battery health state |
| CN109975715A (en) * | 2019-03-08 | 2019-07-05 | 天津力神电池股份有限公司 | A kind of preparation method of lithium ion battery of electric automobile mould group remaining capacity |
| CN110687465A (en) * | 2019-10-15 | 2020-01-14 | 北京海博思创科技有限公司 | Battery pack health state detection system and test method |
| CN114355224A (en) * | 2022-03-17 | 2022-04-15 | 深圳市信润富联数字科技有限公司 | Battery health state prediction method and device, electronic device and readable storage medium |
| US11982660B2 (en) | 2021-06-17 | 2024-05-14 | GM Global Technology Operations LLC | Quality control system for analyzing the quality of a battery cell through analysis of a physical property of a gas formed during a cell formation process and a method of analyzing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103760493B (en) * | 2014-01-17 | 2016-06-08 | 安徽江淮汽车股份有限公司 | The detection method of health state of extended-range electric vehicle power battery and system |
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| CN104808152A (en) * | 2014-01-24 | 2015-07-29 | 通用汽车环球科技运作有限责任公司 | Systems and methods for determining battery state information based on internal battery pressure |
| CN104569844B (en) * | 2014-12-31 | 2017-06-16 | 浙江大学宁波理工学院 | Valve-regulated sealed lead-acid batteries health status monitoring method |
| CN104569844A (en) * | 2014-12-31 | 2015-04-29 | 浙江大学宁波理工学院 | Valve control seal type lead-acid storage battery health condition monitoring method |
| CN105572598A (en) * | 2016-01-29 | 2016-05-11 | 宇龙计算机通信科技(深圳)有限公司 | Battery expansion detecting method and terminal |
| CN106569143A (en) * | 2016-11-11 | 2017-04-19 | 常州普莱德新能源电池科技有限公司 | Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle |
| CN106842065A (en) * | 2017-04-10 | 2017-06-13 | 北京新能源汽车股份有限公司 | Method and device for acquiring battery health state |
| CN106842065B (en) * | 2017-04-10 | 2020-01-17 | 北京新能源汽车股份有限公司 | Method and device for acquiring battery health state |
| CN109975715A (en) * | 2019-03-08 | 2019-07-05 | 天津力神电池股份有限公司 | A kind of preparation method of lithium ion battery of electric automobile mould group remaining capacity |
| CN109975715B (en) * | 2019-03-08 | 2021-05-14 | 天津力神电池股份有限公司 | Method for obtaining residual electric quantity of lithium ion battery module of electric vehicle |
| CN110687465A (en) * | 2019-10-15 | 2020-01-14 | 北京海博思创科技有限公司 | Battery pack health state detection system and test method |
| CN110687465B (en) * | 2019-10-15 | 2021-11-09 | 北京海博思创科技股份有限公司 | Battery pack health state detection system and test method |
| US11982660B2 (en) | 2021-06-17 | 2024-05-14 | GM Global Technology Operations LLC | Quality control system for analyzing the quality of a battery cell through analysis of a physical property of a gas formed during a cell formation process and a method of analyzing the same |
| CN114355224A (en) * | 2022-03-17 | 2022-04-15 | 深圳市信润富联数字科技有限公司 | Battery health state prediction method and device, electronic device and readable storage medium |
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