CN103344920B - A kind of method and apparatus that detects cell health state - Google Patents
A kind of method and apparatus that detects cell health state Download PDFInfo
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- CN103344920B CN103344920B CN201310272458.8A CN201310272458A CN103344920B CN 103344920 B CN103344920 B CN 103344920B CN 201310272458 A CN201310272458 A CN 201310272458A CN 103344920 B CN103344920 B CN 103344920B
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Abstract
The invention provides a kind of method that detects cell health state, comprising: the inner pressure of battery that detects battery; From the corresponding relation generating 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; The present invention also provides a kind of equipment that detects cell health state. According to technical scheme provided by the invention, to realize the Detection accuracy of the SOH that improves battery.
Description
[technical field]
The present invention relates to battery detecting field, relate in particular to and a kind ofly detect the method for cell health state and establishStandby.
[background technology]
Day by day ripe along with lithium-ion electric pool technology, and lithium ion battery have have extended cycle life, canThe advantages such as quick charge electric discharge, security performance are good, the application of lithium ion battery is also more and more extensive, mainBe applied to traffic, the communications field, as automobile, mobile phone, notebook computer etc.
Lithium ion battery is as energy-storage units, the battery health shape of lithium ion battery in actual useState (StateofHealth, SOH) has important work for aspects such as maintenance, replacing and the maintenances of productWith, estimating state of health of battery is very important for the reasonable application of battery accurately.
At present the method for estimating state of health of battery is: set up the internal resistance of cell, battery charge state (SOC,StateofCharge) corresponding relation, between temperature, SOH, in the time proposing the request of estimation SOH,Carry out the estimation of temperature survey and SOC, and detect the interior resistance value of battery, from corresponding relation, read withThe corresponding SOH value of battery internal resistance value of measuring temperature, the battery SOC of estimating and detecting.
The method of above-mentioned estimating state of health of battery has certain degree of accuracy for particular battery, but veryUnder susceptible condition, the internal resistance of lithium ion battery does not change or changes does not have evident regularity, and actual useInfluencing each other in process between temperature, electric current, battery is more remarkable, and therefore profit obtains in this wayThe error of SOH value of battery very large; Meanwhile, the method need to process internal resistance, SOC, temperature andRelation between many parameters of SOH, therefore estimation process is more loaded down with trivial details, implementation procedure more complicated, whenBattery occurs when abnormal providing in time battery abnormity early warning; When battery overcharges or crosses, to put lamp differentWhen reason condition, the variation of SOH cannot be analyzed by internal resistance, the finger of battery health may be provided on the contraryShow.
[summary of the invention]
In view of this, the embodiment of the present invention provides a kind of method and apparatus that detects cell health state,To realize the Detection accuracy of the SOH that improves battery.
First aspect, the embodiment of the present invention provides a kind of method that detects cell health state, comprising:
Detect the inner pressure of battery of battery;
From the corresponding relation generating 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 the possible implementation of the first of first aspect, before the inner pressure of battery of described detection battery, shouldMethod also comprises:
Described battery is carried out to the charge-discharge test under preset temperature;
Discharge capacity and initial capacity according to battery after described charge-discharge test obtain the SOH of battery, and give birth toBecome the corresponding relation of described SOH and time;
Detect the inner pressure of battery of battery when charge-discharge test, and generate the curvilinear characteristic of inner pressure of battery and time;
According to the SOH of described battery and the curve spy of the corresponding relation of time and described inner pressure of battery and timeLevy, obtain the SOH of battery and the corresponding relation of inner pressure of battery.
In the possible implementation of the first of first aspect or first aspect, described battery is lithium-ion electricPond.
Second aspect, the embodiment of the present invention provides a kind of equipment that detects cell health state, comprising:
Pressure sensor, for detection of the inner pressure of battery of battery;
Checkout gear, closes from the correspondence generating in advance for the inner pressure of battery detecting according to described pressure sensorIn system, obtain the cell health state SOH of battery; Described corresponding relation is the SOH of battery and inner pressure of batteryCorresponding relation.
In the possible implementation of the first of second aspect, this equipment comprises:
Corresponding relation generating apparatus, for carrying out the charge-discharge test under preset temperature to described battery, describedDischarge capacity and initial capacity according to battery after charge-discharge test obtain the SOH of battery, and generate described SOHCorresponding relation with the time; The inner pressure of battery of battery while detecting charge-discharge test, and generate inner pressure of battery and timeCurvilinear characteristic; According to the SOH of described battery and the corresponding relation of time and described inner pressure of battery and timeCurvilinear characteristic, obtain the SOH of battery and the corresponding relation of inner pressure of battery.
In the possible implementation of the first of second aspect or second aspect, described battery be lithium fromSub-battery.
As can be seen from the above technical solutions, the present invention has following beneficial effect:
In the time need to obtaining the SOH of battery, only need to detect inner pressure of battery, then according to inner pressure of battery withAnd generate in advance the SOH of battery and the corresponding relation of inner pressure of battery, just can obtain the SOH of battery, because ofThis, the testing process of SOH is simple, and the impact that the SOH detecting is subject to the extraneous factor such as temperature, multiplying power isLittle, make the accuracy rate of SOH of the battery detecting higher; And, in the time there are abnormal conditions in battery,Can be judged accurately in time according to the SOH detecting, be provided in time battery abnormity early warning, reliableProperty is higher.
[brief description of the drawings]
Fig. 1 is the functional block diagram of the equipment of the detection cell health state that provides of the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of the method for the detection cell health state that provides of the embodiment of the present invention.
[detailed description of the invention]
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing and concreteEmbodiment describes the present invention.
In use, battery capacity can decline lithium ion battery gradually, namely cell health stateVariation gradually, reason is mainly because the chemical side reactions producing in battery use procedure can consume activityLithium ion, and chemical side reactions can produce gas, along with subtracting of lithium ion active in lithium ion batteryFew, the gas that inside battery produces is more and more, and battery case is subject to the pressure of internal gas and produces changeShape, therefore utilize that battery inner pressure of battery in the cyclic process of charging and discharging increases gradually, battery capacity byThe feature gradually declining, by pressing in test battery, obtains the SOH of battery; Wherein, the SOH of batteryEqual the discharge capacity of battery divided by the initial capacity of battery, the initial capacity of described battery refers to new electricityThe total capacity of battery when pond, along with the increase of cycle-index, the discharge capacity of battery reduces gradually, by littleIn the initial capacity of battery.
The embodiment of the present invention provides a kind of equipment that detects cell health state, and Fig. 1 is the embodiment of the present inventionThe functional block diagram of the equipment of the detection cell health state providing, as shown in Figure 1, this equipment comprises:
Pressure sensor 101, for detection of the inner pressure of battery of battery;
Checkout gear 102, the inner pressure of battery detecting for the described pressure sensor 101 of foundation is from pre-Mr.In the corresponding relation becoming, obtain the cell health state SOH of battery; Described corresponding relation is the SOH of batteryCorresponding relation with inner pressure of battery.
This equipment comprises:
Corresponding relation generating apparatus 103, for described battery is carried out to the charge-discharge test under preset temperature,Discharge capacity and initial capacity according to battery after described charge-discharge test obtain the SOH of battery, and give birth toBecome the corresponding relation of described SOH and time; The inner pressure of battery of battery while detecting charge-discharge test, and generateThe curvilinear characteristic of inner pressure of battery and time; According to the SOH of described battery and the corresponding relation of time and instituteState the curvilinear characteristic of inner pressure of battery and time, 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 present invention gives a kind of method that detects cell health state, and Fig. 2 is the invention processThe schematic flow sheet of the method for the detection cell health state that example provides, as shown in Figure 2, the method bagDraw together following steps:
Step S201, the inner pressure of battery of detection battery.
Concrete, in the time need to obtaining the SOH of certain battery, at this battery surface, pressure sensor is set,Pressure sensor, according to predetermined period, detects the inner pressure of battery of this battery periodically, then will detectInner pressure of battery sends to checkout gear.
Step S202, the described inner pressure of battery of foundation obtains the battery of battery from the corresponding relation generating in advanceHealth status SOH; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery.
Concrete, checkout gear is received after the inner pressure of battery of pressure sensor transmission, in memory deviceThe SOH of pre-stored battery and the corresponding relation of inner pressure of battery, obtain the SOH that this inner pressure of battery is corresponding.
In the technique scheme of the embodiment of the present invention, described battery is lithium ion battery.
Wherein, corresponding relation generating apparatus generates the method for the SOH of battery and the corresponding relation of inner pressure of batteryFor:
At battery surface, pressure sensor is set, then utilizes charge and discharge device to preset temperature to this batteryLoop test under degree, charge and discharge device initial capacity with battery after loop test finishes deducts batteryResidual capacity, obtain the discharge capacity of battery, then use the discharge capacity of battery divided by the initial appearance of batteryAmount, obtains this loop test and finishes the SOH of rear battery, according to this SOH and current time, generatesThe corresponding relation of SOH and time; So, charge and discharge device carries out battery according to default cycle-indexLoop test all obtains the corresponding relation of corresponding SOH and time after each loop test finishes,After all loop tests finish, the corresponding relation of a series of SOH and time will be obtained.
Meanwhile, the pressure sensor of battery surface setting detects inner pressure of battery in real time, at all loop testsAfter end, pressure sensor output inner pressure of battery and the curvilinear characteristic of time.
According to the SOH of battery and the corresponding relation of time, utilize time in corresponding relation from inner pressure of batteryObtain inner pressure of battery corresponding to this time with the curvilinear characteristic of time, thereby obtain battery corresponding to this timeSOH and the corresponding relation of inner pressure of battery, by generate the SOH of battery and the corresponding pass of inner pressure of batterySystem is saved in memory device.
Can carry out loop test for different batteries, to obtain in the SOH and battery for this batteryThe corresponding relation of pressing, so, while detecting the SOH of certain battery, only need to according to the SOH of this battery withThe corresponding relation of inner pressure of battery obtains the SOH of battery.
Wherein, while assessing the application of battery in lithium battery field, mainly carry out under normal temperature and 45 degrees CelsiusBattery is assessed, and in the communications field of lithium battery applications, normal temperature and 45 degrees Celsius are for the most typicalTemperature, can carry out the circulation of battery according to special application scenarios and temperature corresponding to requirement definition simultaneouslyTest, in the present invention, preset temperature is normal temperature or 45 degrees Celsius.
Wherein, described loop test refers to charge and discharge device and first battery is charged, and then to electricityTank discharge, repeats the battery charging process several times of electric discharge again; For example, charge and discharge device is with 50A perseveranceStream battery is charged to 3.6V, then battery is shelved 5 minutes, charge and discharge device with 50A constant current by electricityTank discharge, to 2.0V, is shelved battery after 5 minutes, repeats said process, and cycle-index is 3000 times.
It should be noted that: battery in use, can send out by the electrolyte of battery and both positive and negative polarity raw materialRaw side reaction, the main cause of battery life decay that Here it is, and SOH is exactly the ginseng of assessment battery lifeNumber; Meanwhile, battery is the entirety of a sealing, when living in the side-reaction consumes battery that inside battery occursProperty when material, can supervene gas, these gases cannot be got rid of, and will cause inner pressure of battery to raise, fromAnd pressure on battery surface just raises; By the gas flow that judges that inside battery produces, infer electricityIn pond, active material participates in the amount of side reaction, thereby judges interior how many available active materials in addition of battery,Be that battery can also be emitted how many capacity, the namely SOH of battery. In the time there are abnormal conditions in battery, exampleAs short circuit, active material can fast decoupled, thus moment produce a large amount of gas, can bring the on fire of batteryBlast equivalent risk, at this moment checkout gear can give warning in advance, and safety coefficient is higher.
Described battery is lithium ion battery, and described lithium ion battery comprises rectangular lithium ion battery and flexible packageLithium ion battery; Described rectangular lithium ion battery is rectangular lithium ion battery or square lithium ion battery,As square 50Ah lithium-ion battery with steel shell, square 200Ah lithium ion battery with aluminum shell etc.; Flexible-packaged lithium fromSub-battery is the lithium ion battery that shell adopts hard plastic membrane material, as battery of mobile phone, polymer battery etc.
Technical scheme of the present invention has following beneficial effect:
In the time need to obtaining the SOH of battery, only need to detect inner pressure of battery, then according to inner pressure of battery withAnd generate in advance the SOH of battery and the corresponding relation of inner pressure of battery, just can obtain the SOH of battery, because ofThis, implementation procedure is simple, and handled easily is subject to the impact of the extraneous factor such as temperature, multiplying power less, makesThe accuracy rate of the SOH of the battery detecting is higher; And, in the time there are abnormal conditions in battery, according to inspectionThe SOH measuring can be judged in time accurately, provides in time battery abnormity early warning, and reliability is higher.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all at thisWithin the spirit and principle of invention, any amendment of making, be equal to replacement, improvement etc., all should be included inWithin the scope of protection of the invention.
Claims (4)
1. a method that detects cell health state, is characterized in that, the method comprises:
Detect the inner pressure of battery of battery;
The battery that obtains battery according to described inner pressure of battery from the corresponding relation generating is in advance strongHealth state SOH; Described corresponding relation is the SOH of battery and the corresponding relation of inner pressure of battery;
Wherein, before the inner pressure of battery of described detection battery, the method also comprises:
At battery surface, pressure sensor is set, then utilizes charge and discharge device to carry out this batteryLoop test under preset temperature, charge and discharge device is used the initial of battery after loop test finishesCapacity deducts the residual capacity of battery, obtains the discharge capacity of battery, then holds with the electric discharge of batteryAmount is divided by the initial capacity of battery, obtains this loop test and finish the SOH of rear battery, foundationThis SOH and current time, generate SOH and the corresponding relation of time; So, discharge and rechargeDevice carries out loop test according to default cycle-index to battery, finishes at each loop testAfter all obtain the corresponding relation of corresponding SOH and time, after all loop tests finish, willObtain the corresponding relation of a series of SOH and time;
Meanwhile, the pressure sensor of battery surface setting detects inner pressure of battery in real time, follows allAfter ring test finishes, pressure sensor output inner pressure of battery and the curvilinear characteristic of time;
According to the SOH of battery and the corresponding relation of time, utilize time in corresponding relation from electricityIn pond, press and obtain inner pressure of battery corresponding to this time with the curvilinear characteristic of time, thereby while obtaining thisBetween the corresponding SOH of battery and the corresponding relation of inner pressure of battery, by the SOH of the battery of generationBe saved in memory device with the corresponding relation of inner pressure of battery;
Wherein, described loop test refers to charge and discharge device and first battery is charged, thenTo battery discharge, repeat the battery charging process several times of electric discharge more again.
2. method according to claim 1, is characterized in that, described battery be lithium fromSub-battery.
3. an equipment that detects cell health state, is characterized in that, this equipment comprises:
Pressure sensor, for detection of the inner pressure of battery of battery;
Checkout gear, the inner pressure of battery detecting for the described pressure sensor of foundation is from pre-Mr.In the corresponding relation becoming, obtain the cell health state SOH of battery; Described corresponding relation is batterySOH and the corresponding relation of inner pressure of battery;
This equipment comprises: corresponding relation generating apparatus, corresponding relation generating apparatus generation batteryThe corresponding relation of SOH and inner pressure of battery, is specially:
At battery surface, pressure sensor is set, then utilizes charge and discharge device to carry out this batteryLoop test under preset temperature, charge and discharge device is used the initial of battery after loop test finishesCapacity deducts the residual capacity of battery, obtains the discharge capacity of battery, then holds with the electric discharge of batteryAmount is divided by the initial capacity of battery, obtains this loop test and finish the SOH of rear battery, foundationThis SOH and current time, generate SOH and the corresponding relation of time; So, discharge and rechargeDevice carries out loop test according to default cycle-index to battery, finishes at each loop testAfter all obtain the corresponding relation of corresponding SOH and time, after all loop tests finish, willObtain the corresponding relation of a series of SOH and time;
Meanwhile, the pressure sensor of battery surface setting detects inner pressure of battery in real time, follows allAfter ring test finishes, pressure sensor output inner pressure of battery and the curvilinear characteristic of time;
According to the SOH of battery and the corresponding relation of time, utilize time in corresponding relation from electricityIn pond, press and obtain inner pressure of battery corresponding to this time with the curvilinear characteristic of time, thereby while obtaining thisBetween the corresponding SOH of battery and the corresponding relation of inner pressure of battery, by the SOH of the battery of generationBe saved in memory device with the corresponding relation of inner pressure of battery;
Wherein, described loop test refers to charge and discharge device and first battery is charged, thenTo battery discharge, repeat the battery charging process several times of electric discharge more again.
4. equipment according to claim 3, is characterized in that, described battery be lithium fromSub-battery.
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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 |
| US9573484B2 (en) * | 2014-01-24 | 2017-02-21 | GM Global Technology Operations LLC | 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 |
| 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 |
| CN106569143B (en) * | 2016-11-11 | 2019-11-08 | 常州普莱德新能源电池科技有限公司 | It is a kind of in the method for line computation battery core capacity and SOH, system and electric vehicle |
| 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 |
| 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 |
| 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 |
| CN114355224B (en) * | 2022-03-17 | 2022-06-28 | 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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| JPH06215751A (en) * | 1993-01-18 | 1994-08-05 | Shin Kobe Electric Mach Co Ltd | Alkaline storage battery |
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