CN110843604B - Method for preventing overvoltage caused by repeated charging of power battery - Google Patents
Method for preventing overvoltage caused by repeated charging of power battery Download PDFInfo
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- CN110843604B CN110843604B CN201911015744.XA CN201911015744A CN110843604B CN 110843604 B CN110843604 B CN 110843604B CN 201911015744 A CN201911015744 A CN 201911015744A CN 110843604 B CN110843604 B CN 110843604B
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- power battery
- charge state
- recharging
- battery
- charging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/15—Preventing overcharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for preventing overvoltage caused by repeated charging of a power battery. If the battery is not used or the reduction value of the battery capacity is less than 0.5 percent in the process from the full-charge state to the recharging process, the charging process can be directly not allowed to enter; if the reduction value of the battery capacity is between 0.5 and 2 percent in the process from the full-charge state to the recharging process, proper required current can be found through calibration, and a normal charging process is carried out; if the reduction value of the battery capacity is more than 2% in the process from the full charge state to the recharging process, the charging process is only required to be normally carried out. The invention ensures the safe and good use of the power battery.
Description
Technical Field
The invention belongs to the technical field of new energy automobile power battery management, and particularly relates to a method for preventing overvoltage caused by repeated charging of a power battery.
Background
The entire vehicle terminal market client has the operation of recharging under the full-charge state of the battery, and the battery overvoltage can be caused. Because the power battery is placed for a period of time in a fully charged or nearly fully charged state, the voltage will return to a quiescent voltage. If the battery is charged again, because the required current of the voltage recovery is larger, the voltage of the fully charged battery is quickly increased under the action of the larger current, although the required current is quickly reduced, the voltage of the battery may be increased to an overvoltage state, and an overvoltage alarm or damage to the battery is caused at the moment.
Because the recharging operation of the charging manager cannot be forbidden, the aim of improving the charging process by improving the strategy design of the charging process is fulfilled in order to avoid the overvoltage of the battery caused by recharging in a full-power state or a state close to the full-power state.
Disclosure of Invention
In view of the above-mentioned technical needs, an object of the present invention is to provide a method for preventing overvoltage caused by multiple charging of a power battery, so as to ensure safe and good use of the power battery.
The technical scheme of the invention is as follows:
a method of preventing overvoltage resulting from multiple charging of a power battery, comprising the steps of:
the method comprises the following steps: firstly, identifying whether the power battery is in a full charge state, and only in the full charge state, carrying out the following steps; if not, executing a normal charging process when recharging;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: if Q is smaller than a set lower limit value Q1 in the process from the full charge state to the recharging process, the charging process is not allowed to enter;
step four: if Q is in the range of a set lower limit value Q1-upper limit value Q2 in the process from the full-charge state to the recharging process, finding out proper required current through calibration, wherein the required current is smaller than the required current value of the normal charging process, and then executing the charging process according to the required current;
step five: and if Q is larger than the upper limit value Q2 in the process from the full charge state to the recharging process, the required current does not need to be calibrated again, and the normal charging process is executed.
Preferably, in the third step, the lower limit value Q1 is 0.5%.
Preferably, in the fourth and fifth steps, the upper limit Q2 is 2%.
Preferably, in the first step, whether the power battery is in a full charge state is identified according to the state of charge SOC of the power battery or whether a cut-off voltage is reached in the last charging process.
The invention has the beneficial effects that:
the invention determines the required current under the condition of recharging according to the reduction degree of the battery capacity from the full charge state to the recharging process. If the reduction value of the battery capacity is smaller, the charging process can be directly not allowed to enter; if the battery capacity reduction value is within a certain range, a proper required current can be found through calibration; if the capacity reduction value of the battery is larger, the charging process is only needed to be normally carried out, so that the safety and the good use of the power battery are ensured.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1: and the schematic diagram of the charging process is set for the battery management after recharging.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, the method for preventing overvoltage caused by multiple charging of a power battery of the invention comprises the following steps:
the method comprises the following steps: firstly, identifying whether the power battery is in a full charge state or not according to the SOC of the power battery or whether the SOC reaches a cut-off voltage in the last charging process, and only performing the following steps in the full charge state; if not, executing a normal charging process when recharging;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: if Q is less than 0.5% in the process from the full charge state to the recharging process, the charging process is not allowed to enter;
step four: if Q is in the range of 0.5% -2% in the process from the full-charge state to the recharging process, finding out proper required current through calibration, wherein the required current is smaller than the required current value of the normal charging process, and then executing the charging process according to the required current;
step five: and if the Q is greater than the upper limit value Q2 in the process of recharging from the full charge state, the required current does not need to be calibrated again, and the normal charging process is executed.
The first embodiment is as follows:
a method of preventing overvoltage resulting from multiple charging of a power battery, comprising:
the method comprises the following steps: identifying that the battery is in a full charge state through the state of charge (SOC = 100%) of the power battery or the cut-off voltage is reached in the last charging process;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: the full charge state to recharge process Q is 0.3%, and the charging process is not permitted to enter directly.
The second embodiment:
a method of preventing overvoltage resulting from multiple charging of a power battery, comprising:
the method comprises the following steps: identifying that the battery is in a full charge state through the state of charge (SOC = 100%) of the power battery or the cut-off voltage is reached in the last charging process;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: and Q is 1% in the process from the full charge state to the recharging process, and the proper required current is found through calibration, wherein the required current is smaller than the ordinary charging required current value, and then the charging process is executed.
Example three:
a method of preventing overvoltage resulting from multiple charging of a power battery, comprising:
the method comprises the following steps: identifying that the battery is in a full charge state through the state of charge (SOC = 100%) of the power battery or the cut-off voltage is reached in the last charging process;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: the reduction value of the battery capacity is 5% in the process from the full charge state to the recharging process, the battery can resist large current impact, the required current does not need to be calibrated again, and only the charging process is needed to be carried out normally according to a common mode.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (4)
1. A method of preventing overvoltage resulting from multiple charging of a power battery, comprising the steps of:
the method comprises the following steps: firstly, identifying whether the power battery is in a full charge state, and only performing the following steps in the full charge state; if not, executing a normal charging process when recharging;
step two: calculating the ratio Q of the consumed capacity to the nominal capacity in the process from the full-charge state of the battery to recharging;
step three: if Q is smaller than a set lower limit value Q1 in the process from the full charge state to the recharging process, the charging process is not allowed to enter;
step four: if Q is in the range of a set lower limit value Q1-upper limit value Q2 in the process from the full-charge state to the recharging process, finding out proper required current through calibration, wherein the required current is smaller than the required current value of the normal charging process, and then executing the charging process according to the required current;
step five: and if the Q is greater than the upper limit value Q2 in the process of recharging from the full charge state, the required current does not need to be calibrated again, and the normal charging process is executed.
2. The method for preventing overvoltage caused by multiple charging of power battery as claimed in claim 1, wherein in step three, the lower limit value Q1 is 0.5%.
3. The method for preventing overvoltage caused by multiple charging of the power battery as claimed in claim 1, wherein in the fourth and fifth steps, the upper limit value Q2 is 2%.
4. The method for preventing overvoltage caused by multiple charging of the power battery as claimed in claim 1, wherein in the first step, whether the power battery is in a full charge state is identified according to the state of charge SOC of the power battery or whether a cut-off voltage is reached during the last charging process.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911015744.XA CN110843604B (en) | 2019-10-24 | 2019-10-24 | Method for preventing overvoltage caused by repeated charging of power battery |
| PCT/CN2020/120517 WO2021078034A1 (en) | 2019-10-24 | 2020-10-13 | Method for preventing overvoltage caused by charging power battery multiple times |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911015744.XA CN110843604B (en) | 2019-10-24 | 2019-10-24 | Method for preventing overvoltage caused by repeated charging of power battery |
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| Publication Number | Publication Date |
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| CN110843604A CN110843604A (en) | 2020-02-28 |
| CN110843604B true CN110843604B (en) | 2022-10-14 |
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| CN110843604B (en) * | 2019-10-24 | 2022-10-14 | 金龙联合汽车工业（苏州）有限公司 | Method for preventing overvoltage caused by repeated charging of power battery |
| CN113459898A (en) * | 2021-06-24 | 2021-10-01 | 云度新能源汽车有限公司 | Intelligent remote diagnosis method and system for battery overcharge of electric vehicle |
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| JP3905219B2 (en) * | 1998-04-09 | 2007-04-18 | トヨタ自動車株式会社 | CHARGE CONTROL DEVICE, CONTROL METHOD, AND POWER OUTPUT DEVICE |
| JP2005294141A (en) * | 2004-04-02 | 2005-10-20 | Matsushita Electric Ind Co Ltd | Charging control method of lithium-ion secondary battery pack |
| US8350531B2 (en) * | 2007-10-05 | 2013-01-08 | Panasonic Corporation | Secondary battery charge control method and charge control circuit |
| CN101651240A (en) * | 2009-08-19 | 2010-02-17 | 江苏春兰清洁能源研究院有限公司 | Constant voltage charging method of nickel-hydrogen battery pack |
| CN102790243A (en) * | 2012-08-28 | 2012-11-21 | 江苏力天新能源科技有限公司 | Lithium iron phosphate battery pack charging method for base station |
| CN103326432B (en) * | 2013-06-20 | 2016-05-04 | 广东欧珀移动通信有限公司 | A kind of battery charging control method of electronic equipment and system |
| KR102253188B1 (en) * | 2014-08-01 | 2021-05-18 | 엘지이노텍 주식회사 | Apparatus for controlling rapid charging of electric vehicle |
| CN105048014B (en) * | 2015-06-05 | 2017-05-31 | 哈尔滨理工大学 | A kind of lithium-ion-power cell fast charge method with temperature-compensating |
| CN206432703U (en) * | 2016-11-30 | 2017-08-22 | 比亚迪股份有限公司 | Super-charge super-discharge protection circuit, protection device, battery management system and electric automobile |
| CN109148986B (en) * | 2017-06-28 | 2021-04-02 | 宁德新能源科技有限公司 | Charging method and device |
| CN107611510B (en) * | 2017-08-31 | 2020-03-17 | 苏州新中能源科技有限公司 | Charging control method and charging control device |
| CN110843604B (en) * | 2019-10-24 | 2022-10-14 | 金龙联合汽车工业（苏州）有限公司 | Method for preventing overvoltage caused by repeated charging of power battery |
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| WO2021078034A1 (en) | 2021-04-29 |
| CN110843604A (en) | 2020-02-28 |
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