CN103267950B - A kind of batteries of electric automobile group SOH value appraisal procedure - Google Patents
A kind of batteries of electric automobile group SOH value appraisal procedure Download PDFInfo
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- CN103267950B CN103267950B CN201210539020.7A CN201210539020A CN103267950B CN 103267950 B CN103267950 B CN 103267950B CN 201210539020 A CN201210539020 A CN 201210539020A CN 103267950 B CN103267950 B CN 103267950B
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Abstract
The invention discloses a kind of batteries of electric automobile group SOH value appraisal procedure, comprise and measure battery pack actual capacity and calculate electric battery SOH value, electric battery SOH standard value is set, if the difference of electric battery SOH value and electric battery SOH standard value is m; As m & gt; When 0, batteries of electric automobile group SOH value is evaluated as normally, as m & lt; Or when=0, batteries of electric automobile group SOH value is evaluated as abnormal.Before introducing once the electric battery SOH value assessed revise, can effectively eliminate assessment electric battery in the charge state SOH value time the error that produces.Use the present invention, can obtain instant electric battery SOH value accurately when electric motor car runs, user, according to obtained SOH value, can formulate electric battery operational version further, to obtain good electric motor car experience.
Description
Technical field
The present invention relates to batteries of electric automobile fabric anomaly technical field, be specifically related to a kind of batteries of electric automobile group SOH value appraisal procedure.
Background technology
Battery was using in process, and its performance can decay gradually.Be embodied in the decline of battery capacity, cruising time shortens.For electric automobile, if battery performance decline situation cannot be learnt, be often that actual driving is made troubles because electricity prepares not enough.Therefore, be necessary the SOH(cell health state assessing batteries of electric automobile group), and change for the electric battery that SOH value is too low.
Conventional batteries of electric automobile group SOH value appraisal procedure is as follows: the actual capacity recording electric battery, and theoretical capacity when dispatching from the factory divided by electric battery with it, the business of gained is electric battery SOH value.Said method can obtain the higher SOH value of degree of accuracy in electric battery charging fashion, but under battery power discharge process status, can there is larger error because of the SOH value measured by the change of physico-chemical property in battery power discharge process.Therefore, existing batteries of electric automobile group SOH value appraisal procedure can not provide the SOH value of the actual performance change in the use procedure of reflection electric battery when electric automobile runs.This changes the opportunity of batteries of electric automobile group by incuring loss through delay, for user makes troubles.
Summary of the invention
In view of this, the present invention discloses a kind of electric battery SOH appraisal procedure that accurately immediately can reflect batteries of electric automobile group health status.
Object of the present invention is achieved through the following technical solutions:
A kind of batteries of electric automobile group SOH value appraisal procedure, is included in and measures battery pack actual capacity, measure battery pack actual capacity, if to measure battery pack actual capacity number of times be n(n be greater than 1 natural number);
When measuring battery pack actual capacity n-th time, when electric battery is in charged state, electric battery SOH value is: get the battery pack actual capacity measured for n-th time, and the battery pack actual capacity measured n-th time is divided by electric battery theoretical capacity;
When measuring battery pack actual capacity n-th time, when electric battery is in discharge condition, electric battery SOH value is: electric battery SOH value when getting the battery pack actual capacity that measures for n-th time and measure battery pack actual capacity for (n-1)th time, and the battery pack actual capacity measured n-th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for (n-1)th time and electric battery theoretical capacity;
When measuring battery pack actual capacity (n+1)th time, when electric battery is in discharge condition, electric battery SOH value is: electric battery SOH value when getting the battery pack actual capacity that measures for (n+1)th time and measure battery pack actual capacity for n-th time, and the battery pack actual capacity measured (n+1)th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for n-th time and electric battery theoretical capacity;
Electric battery SOH standard value is set, if the difference of electric battery SOH value and electric battery SOH standard value is m; As m>0, batteries of electric automobile group SOH value is evaluated as normally,
As m< or=0, batteries of electric automobile group SOH value is evaluated as abnormal.
Because battery pack actual capacity can not have greatly changed within a certain period of time, measuring as interval is carried out of described battery pack actual capacity.Electric battery in the charge state, use existing electric battery SOH value appraisal procedure can obtain electric battery SOH value accurately, electric battery SOH value when namely getting the battery pack actual capacity that measures for n-th time and measure battery pack actual capacity for (n-1)th time, the battery pack actual capacity measured n-th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for (n-1)th time and electric battery theoretical capacity, and gained business is required battery pack charging status SOH value.And for the electric battery under discharge condition, when then measuring battery pack actual capacity n-th time, when electric battery is in discharge condition, electric battery SOH value is: electric battery SOH value when getting the battery pack actual capacity that measures for n-th time and measure battery pack actual capacity for (n-1)th time, the battery pack actual capacity measured n-th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for (n-1)th time and electric battery theoretical capacity, namely the electric battery SOH value introducing last assessment gained is revised this assessment electric battery SOH value, its business is the instant electric battery SOH value of the battery cell health status that can accurately indicate under discharge condition.
When electric battery is in charged state, the mode measuring battery pack actual capacity for n-th time is that the product of SOC value before electric battery theoretical capacity and electric battery are charged adds that electric battery is when time be filled with electricity sum; When electric battery is in discharge condition, measure for n-th time battery pack actual capacity for electric battery theoretical capacity and electric battery charge before SOC value and measure battery pack actual capacity for (n-1)th time time the product of electric battery SOH value add that electric battery secondary ought be filled with electricity sum.
Further, described electric battery SOH value assessment should be carried out at 15-30 DEG C.
Due at too high or too low temperature, larger change can be there is in electric battery SOH value, and batteries of electric automobile group uses mostly under the environment of 15-30 DEG C, therefore described batteries of electric automobile group SOH value assessment is carried out at 15-30 DEG C, gained batteries of electric automobile group SOH value can closer to its actual value.
Batteries of electric automobile group SOH value appraisal procedure is divided into two kinds with the charging and discharging state of electric battery by the present invention, can assess the SOH value of battery of electric vehicle group under charging and electric discharge two kinds of different conditions respectively, single SOH value appraisal procedure of efficiently solving over cannot obtain the technical barrier of electric battery SOH value accurately in the discharged condition.The present invention especially obtain to discharge battery pack actual capacity under discharge condition time, before introducing once the electric battery SOH value assessed revise, can effectively eliminate assessment electric battery in the charge state SOH value time the error that produces.Use the present invention, can obtain instant electric battery SOH value accurately when electric motor car runs, user, according to obtained SOH value, can formulate electric battery operational version further, to obtain good electric motor car experience.
Embodiment
The present invention to be described in further detail below in conjunction with embodiment for the ease of it will be appreciated by those skilled in the art that:
Embodiment 1
The present embodiment provides a kind of electric automobile lithium battery electric battery SOH value appraisal procedure, the method runs in the batteries management system in electric motor car, batteries management system is connected with above-mentioned lithium battery group, records its every data, and then assesses SOH value.
Theoretical capacity when above-mentioned lithium battery group is dispatched from the factory is Q
,batteries management system measures one-shot battery group actual capacity and assesses the SOH value of electric battery for every 100 hours.Each battery pack actual capacity is surveyed interval every determining because of the performance according to electric battery.
When measuring battery pack actual capacity the 20th time, this lithium battery group is in charged state.Before this charging, lithium battery group SOC value is M
20; After lithium battery group is full of electricity, records and be filled with electricity E altogether when secondary
20, battery pack actual capacity Q when batteries management system just can be regarded as proper
20=E
20+ Q × M
20.
Batteries management system just can be regarded as to obtain the SOH of now electric battery
20=Q
20/ Q.
Batteries management system is by SOH
20value is output on electric automobile screen and shows, and is stored in batteries management system simultaneously, does computing next time.
Be provided with in batteries management system and electric battery SOH standard value 30% is set, if the difference of electric battery SOH value and electric battery SOH standard value is m; As m>0, batteries of electric automobile group SOH value is evaluated as normally,
As m< or=0, batteries of electric automobile group SOH value is evaluated as abnormal.
Namely in the present embodiment, when electric automobile SOH value equal lower than 30% time, batteries management system will give the alarm, and reminding user changes lithium battery group in time.
Embodiment 2
The present embodiment provides a kind of electric automobile lithium battery electric battery SOH value appraisal procedure, the method runs in the batteries management system in electric motor car, batteries management system is connected with above-mentioned lithium battery group, records its every data, and then assesses SOH value.
Theoretical capacity when above-mentioned lithium battery group is dispatched from the factory is Q
,batteries management system measures one-shot battery group actual capacity and assesses the SOH value of electric battery for every 125 hours.
When measuring battery pack actual capacity the 31st time, this lithium battery group discharge condition, before this electric discharge, the SOH value that its last time records is SOH
30.Record electric battery and discharge electricity E altogether when secondary
31, SOC value is M
31.Can be regarded as to obtain current battery pack actual capacity Q
31=E
31+ SOH
30× Q × M
31.
And then electric battery SOH under current state can be calculated
31=Q
31/ (SOH
30× Q).
Batteries management system is by SOH
31value is output on electric automobile screen and shows, and is stored in batteries management system simultaneously, does computing next time.
Be provided with in batteries management system and electric battery SOH standard value 25% is set, if SOH
31be m with the difference of electric battery SOH standard value; As m>0, batteries of electric automobile group SOH value is evaluated as normally,
As m< or=0, batteries of electric automobile group SOH value is evaluated as abnormal.
Namely in the present embodiment, when electric automobile SOH value equal lower than 25% time, batteries management system will give the alarm, and reminding user changes lithium battery group in time.
Be more than wherein specific implementation of the present utility model, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection domain of the present utility model.
Claims (3)
1. a batteries of electric automobile group SOH value appraisal procedure, comprises and measures battery pack actual capacity, if to measure battery pack actual capacity number of times be n(n be greater than 1 natural number);
When measuring battery pack actual capacity n-th time, when electric battery is in charged state, electric battery SOH value is: get the battery pack actual capacity measured for n-th time, and the battery pack actual capacity measured n-th time is divided by electric battery theoretical capacity;
When measuring battery pack actual capacity n-th time, when electric battery is in discharge condition, electric battery SOH value is: electric battery SOH value when getting the battery pack actual capacity that measures for n-th time and measure battery pack actual capacity for (n-1)th time, and the battery pack actual capacity measured n-th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for (n-1)th time and electric battery theoretical capacity;
When measuring battery pack actual capacity (n+1)th time, when electric battery is in discharge condition, electric battery SOH value is: electric battery SOH value when getting the battery pack actual capacity that measures for (n+1)th time and measure battery pack actual capacity for n-th time, and the battery pack actual capacity measured (n+1)th time is divided by the product of electric battery SOH value when to measure battery pack actual capacity for n-th time and electric battery theoretical capacity;
Electric battery SOH standard value is set, if the difference of electric battery SOH value and electric battery SOH standard value is m; As m>0, batteries of electric automobile group SOH value is evaluated as normally,
As m< or=0, batteries of electric automobile group SOH value is evaluated as abnormal.
2. batteries of electric automobile group SOH value appraisal procedure according to claim 1, it is characterized in that: when electric battery is in charged state, the mode measuring battery pack actual capacity for n-th time is that the product of SOC value before electric battery theoretical capacity and electric battery are charged adds that electric battery is when time be filled with electricity sum; When electric battery is in discharge condition, measure for n-th time battery pack actual capacity for electric battery theoretical capacity and electric battery charge before SOC value and measure battery pack actual capacity for (n-1)th time time the product of electric battery SOH value add that electric battery secondary ought be filled with electricity sum.
3. batteries of electric automobile group SOH value appraisal procedure according to claim 2, is characterized in that: described electric battery SOH value assessment should be carried out at 15-30 DEG C.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6182025B2 (en) * | 2013-09-05 | 2017-08-16 | カルソニックカンセイ株式会社 | Battery health estimation device and health estimation method |
| CN103632204B (en) * | 2013-09-23 | 2016-05-18 | 浙江大学 | A kind of batteries of electric automobile management method |
| KR102241683B1 (en) * | 2014-07-30 | 2021-04-19 | 삼성전자주식회사 | Method and apparatus for estimating state of battery |
| CN105137358B (en) * | 2015-08-27 | 2018-06-26 | 张家港莫特普数据科技有限公司 | The SOC/SOH Forecasting Methodologies of power battery based on big data self-study mechanism |
| CN106610475B (en) * | 2015-10-21 | 2019-08-20 | 深圳市沃特玛电池有限公司 | A kind of battery pack health degree appraisal procedure |
| CN105607011A (en) * | 2016-03-23 | 2016-05-25 | 北京经纬恒润科技有限公司 | Method and device for estimating state of health (SOH) of battery |
| CN106019159B (en) * | 2016-05-11 | 2018-12-18 | 安徽锐能科技有限公司 | Lithium battery health status estimates update method |
| CN108572320B (en) * | 2017-03-09 | 2020-02-14 | 郑州宇通客车股份有限公司 | Method and device for estimating effective capacity and health state of minimum single battery and system |
| CN107742755B (en) * | 2017-09-27 | 2019-05-28 | 安徽江淮汽车集团股份有限公司 | Electric car SOH modification method and device |
| CN107861074B (en) * | 2017-12-21 | 2020-05-26 | 江苏罗思韦尔电气有限公司 | Lithium battery SOC estimation method |
| WO2021189419A1 (en) * | 2020-03-27 | 2021-09-30 | 华为技术有限公司 | Method for estimating state of health of battery, battery management device, and battery management system |
| CN111766524B (en) * | 2020-07-16 | 2023-03-10 | 浙江吉智新能源汽车科技有限公司 | Method, device, equipment and storage medium for determining battery health state |
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