CN104596665A - Method for detecting battery temperature during charging - Google Patents
Method for detecting battery temperature during charging Download PDFInfo
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- CN104596665A CN104596665A CN201410849484.7A CN201410849484A CN104596665A CN 104596665 A CN104596665 A CN 104596665A CN 201410849484 A CN201410849484 A CN 201410849484A CN 104596665 A CN104596665 A CN 104596665A
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- battery
- temperature
- charging
- sampling
- discharging
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Abstract
The invention provides a method for accurately judging battery temperature based on deeply analyzing the characteristics of the battery temperature and defining basic factors causing errors. The outside part of a sampling battery during the charging or discharging process of the battery corresponds to the voltages of two ends of NTC; according to the method, no matter charging or discharging, Re exists and results in that the sampling temperature deviates from the actual temperature, and thereby the battery suspends charging and discharging during sampling. According to the method, the batter temperature can be accurately read during charging so as to provide accurate base for subsequent setting of charging current and over-temperature protection, and to play a role in protecting personal safety.
Description
Technical field
The present invention relates to a kind of method detecting battery temperature in battery charge or discharge process.
Background technology
Temperature during battery charging, direct sample NTC (thermistor) both end voltage is converted, and in fact this wherein contain very big error.Owing to there is no effective solution, some schemes just still calculate with this value determines temperature value, and some schemes can be carried out some in software and be compensated, but offset is fixing, and error is indefinite, the temperature detected when these two kinds of methods all can cause charging is forbidden.
Summary of the invention
The present invention is based on the characteristic analysing in depth research battery temperature, specify that the basic factor causing error, propose a kind of method that accurately can judge battery temperature.
Technical scheme of the present invention is as follows:
A kind of method detecting battery temperature, battery is connected with external charger by connector, in battery charge or discharge process, sampling battery outside corresponds to the voltage of NTC (thermistor) two end terminals, is different from prior art: suspend battery charging and discharging during sampling.
The power supply in loop, above-mentioned NTC place can take from the external interface of battery charging.
The present invention also provides a kind of battery temperature automatic checkout system, comprise temperature detection instruction input module, voltage sample module and chain logic module, battery is connected with external charger by connector, described chain logic module cuts off battery charging and discharging loop when temperature detection instruction inputs, trigger voltage sampling module.
Concrete preferred implementation is as follows:
In battery charging and discharging loop, circuit between battery and connector is arranged in series two change-over switches, the power supply terminal of extraction voltage sampling module between two switches, the state that described chain logic module realizes battery charging and discharging loop by these two change-over switches switches.
The present invention can read battery temperature during charging accurately, thus provides foundation accurately to follow-up charging current setting and overheat protector, plays the object of protection personal safety.
Accompanying drawing explanation
Fig. 1 is the sample circuit of battery temperature.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and embodiment are described in further detail.
As shown in Figure 1, both charged the battery by connector, simultaneously to system (mainboard) power supply; Electric discharge and battery are to system power supply.Desirable battery temperature corresponds to Vr, i.e. NTC both end voltage, in the use of reality, the oxidation of battery surface, connector reed or structure problem, contact impedance can be caused to become large, be equivalent to 1, the indirect resistance Re of 2, this resistance may reach hundred milliohm ranks.ADC sampled value is 2, voltage V32 between 3, V32=Vr+Ve.More severe situation, Re is comparatively large, and charging and discharging currents is also very large, and Ve can bring the error of more than 10 degree.Specifically, low than actual temperature more than 10 degree during charging, cause the charging exceeding safe temperature; Contrary when impact and charging during electric discharge, sample temperature can be caused higher than actual temperature, cause normal temperature not work.
In sum, no matter be charging or electric discharge, due to the existence of Re, sample temperature all can be caused to depart from actual temperature.
Existing scheme is not fully recognized that the impact that Ve brings, and a lot of scheme, by making repeated attempts, travels through and finds a fixing Re, then carry out temperature compensation in software.But because Re is change in actual use, therefore can not really deal with problems with this thinking of fixed value software compensation.
So under the thinking that the present invention is new, can propose a kind of simple and effective battery temperature detection method, namely in battery charge or discharge process, as detected battery temperature, then suspend the charging of battery, electric discharge, system obtains electric current from external power source and realizes sampling.Concrete a kind of implementation, as Fig. 1, increases by two change-over switch K1 and K2.K1on, K2on, then USB had both charged the battery simultaneously to system power supply; K1off, K2on, then battery is in discharge condition, to system power supply.Stop battery charging and discharging meaning completely by external power source to system power supply, i.e. K1on, K2off, then USB only give system power supply, battery neither charges and does not also discharge, and now reads V
32voltage, the battery temperature of detection is the most accurate.Like this, electric current would not be had to flow through Re, and Ve is almost the sampled value V of 0, ADC
32=Vr.
According to the method, the true temperature of battery can be obtained, thus better can control charging current, play the object of protection personal safety.
Claims (4)
1. detect a method for battery temperature, battery is connected with external charger by connector, and in battery charge or discharge process, sampling battery outside corresponds to the voltage of NTC two end terminals, it is characterized in that: suspend battery charging and discharging during sampling.
2. the method for detection battery temperature according to claim 1, is characterized in that: the power supply in loop, NTC place takes from the external interface of battery charging.
3. a battery temperature automatic checkout system, comprise temperature detection instruction input module and voltage sample module, battery is connected with external charger by connector, it is characterized in that: this battery temperature automatic checkout system also comprises chain logic module, described chain logic module cuts off battery charging and discharging loop when temperature detection instruction inputs, trigger voltage sampling module.
4. battery temperature automatic checkout system according to claim 3, it is characterized in that: in described battery charging and discharging loop, circuit between battery and connector is arranged in series two change-over switches, the power supply terminal of extraction voltage sampling module between two switches, the state that described chain logic module realizes battery charging and discharging loop by these two change-over switches switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849484.7A CN104596665B (en) | 2014-12-30 | 2014-12-30 | A kind of method that battery temperature is detected during charging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849484.7A CN104596665B (en) | 2014-12-30 | 2014-12-30 | A kind of method that battery temperature is detected during charging |
Publications (2)
| Publication Number | Publication Date |
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| CN104596665A true CN104596665A (en) | 2015-05-06 |
| CN104596665B CN104596665B (en) | 2017-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410849484.7A Active CN104596665B (en) | 2014-12-30 | 2014-12-30 | A kind of method that battery temperature is detected during charging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633498B (en) * | 2016-03-15 | 2018-05-08 | 北京小米移动软件有限公司 | Battery temperature detection method and device |
| CN113295291A (en) * | 2020-02-21 | 2021-08-24 | Oppo广东移动通信有限公司 | Temperature detection method and device, electronic equipment and computer readable storage medium |
| WO2022247692A1 (en) * | 2021-05-24 | 2022-12-01 | 厦门紫光展锐科技有限公司 | Ntc battery temperature compensation method and related product |
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| CN1791804A (en) * | 2003-06-27 | 2006-06-21 | 古河电气工业株式会社 | Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec |
| US20070182418A1 (en) * | 2005-08-03 | 2007-08-09 | Yvan Reynier | Electrochemical Thermodynamic Measurement System |
| CN201523248U (en) * | 2009-09-22 | 2010-07-07 | 武汉力源信息技术股份有限公司 | Intelligent charger |
| CN201893593U (en) * | 2010-11-24 | 2011-07-06 | 陕西瑞能电气有限责任公司 | Remote control charging and discharging system for storage battery |
| US20130322488A1 (en) * | 2012-04-27 | 2013-12-05 | Rachid Yazami | Imbedded chip for battery applications |
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2014
- 2014-12-30 CN CN201410849484.7A patent/CN104596665B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1791804A (en) * | 2003-06-27 | 2006-06-21 | 古河电气工业株式会社 | Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec |
| US20070182418A1 (en) * | 2005-08-03 | 2007-08-09 | Yvan Reynier | Electrochemical Thermodynamic Measurement System |
| CN201523248U (en) * | 2009-09-22 | 2010-07-07 | 武汉力源信息技术股份有限公司 | Intelligent charger |
| CN201893593U (en) * | 2010-11-24 | 2011-07-06 | 陕西瑞能电气有限责任公司 | Remote control charging and discharging system for storage battery |
| US20130322488A1 (en) * | 2012-04-27 | 2013-12-05 | Rachid Yazami | Imbedded chip for battery applications |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633498B (en) * | 2016-03-15 | 2018-05-08 | 北京小米移动软件有限公司 | Battery temperature detection method and device |
| CN113295291A (en) * | 2020-02-21 | 2021-08-24 | Oppo广东移动通信有限公司 | Temperature detection method and device, electronic equipment and computer readable storage medium |
| WO2022247692A1 (en) * | 2021-05-24 | 2022-12-01 | 厦门紫光展锐科技有限公司 | Ntc battery temperature compensation method and related product |
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| Publication number | Publication date |
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| CN104596665B (en) | 2017-07-28 |
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Effective date of registration: 20170607 Address after: 710077 Shaanxi city of Xi'an province high tech Zone No. 211 HUanpu Ba Lu day Valley Industrial Park C Building 5 floor Applicant after: XI'AN YIPU COMMUNICATION TECHNOLOGY CO., LTD. Address before: 710075, Shaanxi, Xi'an hi tech Zone, two North Road Crystal International Building No. 21002, room 2 Applicant before: Xi'an Qianyi Enterprise Management Consultation Co., Ltd. |
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