CN102479983B - For charge control method and the device of electric automobile power battery - Google Patents

For charge control method and the device of electric automobile power battery Download PDF

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Publication number
CN102479983B
CN102479983B CN201010577019.4A CN201010577019A CN102479983B CN 102479983 B CN102479983 B CN 102479983B CN 201010577019 A CN201010577019 A CN 201010577019A CN 102479983 B CN102479983 B CN 102479983B
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China
Prior art keywords
electric automobile
power battery
automobile power
temperature
battery
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CN201010577019.4A
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Chinese (zh)
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CN102479983A (en
Inventor
彭阿勇
汤小华
李帅辉
李伟铭
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比亚迪股份有限公司
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Priority to CN201010577019.4A priority Critical patent/CN102479983B/en
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Abstract

The present invention proposes a kind of charge control method for electric automobile power battery, comprises the following steps: the temperature detecting electric automobile power battery; Judge whether the temperature of electric automobile power battery is less than the lowest temperature angle value preset; If judge that the temperature of electric automobile power battery is less than lowest temperature angle value, then carry out constantly switching ground charging and discharging to electric automobile power battery; And if judge that the temperature of electric automobile power battery is not less than lowest temperature angle value, then only electric automobile power battery is charged.The present invention to charge to electrokinetic cell by adopting the mode constantly switching ground charging and discharging at low temperatures and to heat, achieve and under the prerequisite not damaging battery, electrokinetic cell is charged, improve the utilance of electrokinetic cell, extend the useful life of electrokinetic cell.In addition, expand the serviceability temperature scope of electrokinetic cell, thus make the use region using the electric automobile of this type of electrokinetic cell more extensive.

Description

For charge control method and the device of electric automobile power battery

Technical field

The present invention relates to electric vehicle engineering field, particularly a kind of charge control method for electric automobile power battery and device.

Background technology

Because ferric phosphate lithium cell has a lot of advantages, such as, long service life, capacity be large, can carry out discharge and recharge etc. by big current, therefore usual using the electrokinetic cell of ferric phosphate lithium cell as electric automobile.But the present inventor is carrying out prior art finding in research and practice process: poor performance when ferric phosphate lithium cell is at low temperature, generally speaking, for single battery core, it is about 60% ~ 70% at the capability retention of 0 DEG C, 40% ~ 55% is about at the capability retention of-10 DEG C, be about 20% ~ 40% at the capability retention of-20 DEG C, and be 100% at the capability retention of 23 DEG C.Such cryogenic property obviously can not meet the instructions for use of electrical source of power.In addition, charge to battery when low temperature, the transition-metal oxide that battery can be made to include lithium reacts, precipitating metal lithium.And because this reaction is irreversible, even if battery temperature returns to normal working temperature, lithium metal also cannot enter in the circulation of discharge and recharge again, thus causes the permanent reduction of battery capacity, finally causes cell damage.Further, due to the accumulation of lithium metal, make the harm such as battery is in use easily short-circuited, also reduce the fail safe of battery simultaneously.Therefore, if charged to electrokinetic cell when low temperature, not only cannot be full of battery, but also the permanent reduction of battery capacity can be caused.

Summary of the invention

Object of the present invention is intended at least solve one of above-mentioned technological deficiency, proposes a kind of control method of charging to electric automobile power battery at low temperatures and device.

For achieving the above object, one aspect of the present invention proposes a kind of charge control method for electric automobile power battery, comprises the following steps: the temperature detecting electric automobile power battery; Judge whether the temperature of described electric automobile power battery is less than the lowest temperature angle value preset; If judge that the temperature of described electric automobile power battery is less than described lowest temperature angle value, then carry out constantly switching ground charging and discharging to described electric automobile power battery; And if judge that the temperature of described electric automobile power battery is not less than described lowest temperature angle value, then only described electric automobile power battery is charged.

The present invention proposes a kind of battery charge controller for electric automobile power battery on the other hand, comprises controller and current transformer.Wherein, described controller is for detecting the temperature of described electric automobile power battery, and judge whether the temperature of described electric automobile power battery is less than the lowest temperature angle value preset, and according to the output control current transformer of described judgement described electric automobile power battery charged and/or discharge; Described current transformer is used for charging to described electric automobile power battery according to the judged result of described controller and/or discharging.

The present invention to charge to electrokinetic cell by adopting the mode constantly switching ground charging and discharging at low temperatures and to heat, achieve and under the prerequisite not damaging battery, electrokinetic cell is charged, improve the utilance of electrokinetic cell, extend the useful life of electrokinetic cell.In addition, expand the serviceability temperature scope of electrokinetic cell, thus make the use region using the electric automobile of this type of electrokinetic cell more extensive.

The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.

Accompanying drawing explanation

The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:

Fig. 1 is the flow chart of the charge control method for electric automobile power battery of the embodiment of the present invention; And

Fig. 2 is the structural representation of the battery charge controller for electric automobile power battery of the embodiment of the present invention.

Embodiment

Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.

Be illustrated in figure 1 the flow chart of the charge control method for electric automobile power battery of the embodiment of the present invention, the method comprises the following steps:

Step S101, detects the electricity of electric automobile power battery.

Step S102, judges whether electric automobile power battery is full of electricity.

In an example of the present invention, before charging, first can detect the electricity of electrokinetic cell, judge whether electrokinetic cell is full of electricity.If judge electrokinetic cell underfill electricity, just start to perform step S103, electrokinetic cell is charged; If judge that electrokinetic cell is full of electricity, then electrokinetic cell is not charged, to prevent from causing damage to battery, reduce the useful life of battery.

Step S103, detects the temperature of electric automobile power battery.

Step S104, judges whether the temperature of the electric automobile power battery detected is less than the lowest temperature angle value preset.

In one embodiment of the invention, the minimum temperature presetting electric automobile power battery is 20 DEG C, should be understood that this is only schematic embodiment, is not limited to the present invention, in addition, also can set other lowest temperature angle value.

Step S105, if judge that the temperature of electric automobile power battery is less than the lowest temperature angle value preset, then carries out constantly switching ground charging and discharging to electric automobile power battery.

Step S106, if judge that the temperature of electric automobile power battery is not less than the lowest temperature angle value preset, then only charges to electric automobile power battery.

In one embodiment of the invention, when the temperature of electrokinetic cell is lower than 20 DEG C, charge command is sent to current transformer, current transformer charges to electrokinetic cell, and the charging interval continues 2 seconds, then sends electric discharge order to current transformer, discharge time continues 1 second, according to such charging interval: discharge time=2: 1 time scale, constantly switch the order of discharge and recharge, electrokinetic cell constantly carries out discharge and recharge.Like this, due to the existence of the internal resistance of cell, in charging process, the carrying out of pulsed is discharged, and can produce heat, raise the temperature of electrokinetic cell, and along with the raising of temperature of powered cell, resistance internal resistance can reduce, ion activity can increase, and battery capacity can increase, and lithium metal would not be had to separate out.When temperature of powered cell reaches 20 DEG C, electrokinetic cell is in optimal charge state substantially, and capacity restoration, to 100%, after this only charges to electrokinetic cell, until electric automobile power battery is full of electricity, stops charging.

Should understand; said method is only schematic embodiment; be not limited to the present invention; those skilled in the art also can make other equivalent replacements according to above-mentioned thought and change; such as; change charging interval and/or discharge time etc., these amendments and conversion all should be included in protection scope of the present invention.

In order to realize above-described embodiment, the present invention also provides a kind of battery charge controller for electric automobile power battery.

Be illustrated in figure 2 the structural representation of the battery charge controller for electric automobile power battery of the embodiment of the present invention, this device comprises controller 10 and current transformer 20.Controller 10 is for detecting the temperature of electric automobile power battery, and judge whether the temperature of electric automobile power battery is less than the lowest temperature angle value preset, and charge according to the output control current transformer 20 pairs of electric automobile power batteries judged and/or discharge.Current transformer 20 is for charge to electric automobile power battery according to the judged result of controller 10 and/or discharge.

In one embodiment of the invention, controller 10 can comprise temperature detecting module 110, temperature judge module 120 and control module 130.Temperature detecting module 110 is for detecting the temperature of electric automobile power battery.Temperature judge module 120 is for judging whether the temperature of the electric automobile power battery detected is less than lowest temperature angle value, in one embodiment of the invention, lowest temperature angle value is 20 DEG C, should understand, this is only schematic embodiment, is not limited to the present invention.Control module 130 is charged for controlling current transformer 20 pairs of electric automobile power batteries according to the judged result of temperature judge module 120 and/or discharges.

Particularly, if temperature judge module 120 judges that the temperature of electric automobile power battery is less than lowest temperature angle value, then control module 130 controls current transformer 20 with the discharge and recharge Time transfer receiver electric automobile power battery preset with carrying out constantly switching charging and discharging, in one embodiment of the invention, the discharge and recharge time ratio preset is 2: 1, should be understood that this is only schematic embodiment, be not limited to the present invention; If temperature judge module 120 judges that the temperature of the electric automobile power battery detected is not less than lowest temperature angle value, then control module 130 controls current transformer 20 and only charges to electric automobile power battery.Should be understood that this is only schematic embodiment, be not limited to the present invention.

In one embodiment of the invention, controller 10 also can comprise electric power detection module 140 and electricity judge module 150.Electric power detection module 140 is for detecting the electricity of electric automobile power battery.Electricity judge module 150 is for judging whether electric automobile power battery is full of electricity.If electricity judge module 150 judges that electric automobile power battery is full of electricity, then electric automobile power battery is not charged.If electricity judge module 150 judges electric automobile power battery underfill electricity, then temperature detecting module 110 detects the temperature of electronic electric automobile power battery, starts to charge, until electric automobile power battery is full of electricity, stops charging.

The present invention to charge to electrokinetic cell by adopting the mode constantly switching ground charging and discharging at low temperatures and to heat, achieve and under the prerequisite not damaging battery, electrokinetic cell is charged, improve the utilance of electrokinetic cell, extend the useful life of electrokinetic cell.In addition, expand the serviceability temperature scope of electrokinetic cell, thus make the use region using the electric automobile of this type of electrokinetic cell more extensive.

Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.

Claims (9)

1. for a charge control method for electric automobile power battery, it is characterized in that, comprise the following steps:
Detect the temperature of electric automobile power battery;
Judge whether the temperature of described electric automobile power battery is less than the lowest temperature angle value preset;
If judge that the temperature of described electric automobile power battery is less than described lowest temperature angle value, then carry out constantly switching ground charging and discharging with electric automobile power battery described in the discharge and recharge Time transfer receiver preset in charging process, wherein, the described discharge and recharge time is than being 2:1; And
If judge that the temperature of described electric automobile power battery is not less than described lowest temperature angle value, then described electric automobile power battery is charged.
2. the charge control method for electric automobile power battery according to claim 1, is characterized in that, before the temperature of described detection electric automobile power battery, also comprises:
Detect the electricity of described electric automobile power battery to judge whether described electric automobile power battery is full of electricity;
If judge that described electric automobile power battery is full of electricity, then described electric automobile power battery is not charged.
3. the charge control method for electric automobile power battery according to claim 1, is characterized in that, described lowest temperature angle value is 20 DEG C.
4. for a battery charge controller for electric automobile power battery, it is characterized in that, comprising:
Controller, for detecting the temperature of described electric automobile power battery, and judge whether the temperature of described electric automobile power battery is less than the lowest temperature angle value preset, and according to the output control current transformer of described judgement described electric automobile power battery charged and/or discharge; And
Described current transformer, for when described controller judges that the temperature of described electric automobile power battery is less than described lowest temperature angle value, carry out constantly switching ground charging and discharging with electric automobile power battery described in the discharge and recharge Time transfer receiver preset in charging process, wherein, the described discharge and recharge time is than being 2:1.
5. the battery charge controller for electric automobile power battery according to claim 4, is characterized in that, described controller comprises further:
Temperature detecting module, for detecting the temperature of described electric automobile power battery;
Temperature judge module, whether the temperature for the electric automobile power battery detected described in judging is less than described lowest temperature angle value;
Control module, to charge to described electric automobile power battery for controlling described current transformer according to the judged result of described judge module and/or to discharge.
6. the battery charge controller for electric automobile power battery according to claim 5, is characterized in that, described lowest temperature angle value is 20 DEG C.
7. the battery charge controller for electric automobile power battery according to claim 5, it is characterized in that, described control module controls described current transformer according to the judged result of described temperature judge module and charges to described electric automobile power battery and/or discharge and comprise further:
If the temperature of the electric automobile power battery detected described in described temperature judge module judgement is less than described lowest temperature angle value, then described control module controls described current transformer to described electric automobile power battery with carrying out constantly switching charging and discharging;
If described judge module judge described in the temperature of electric automobile power battery that detects be not less than described lowest temperature angle value, then described control module controls described current transformer and only charges to described electric automobile power battery.
8. the battery charge controller for electric automobile power battery according to claim 5, is characterized in that, described controller also comprises:
Electric power detection module, for detecting the electricity of described electric automobile power battery; And
Electricity judge module, the electricity for the electric automobile power battery detected described in basis judges whether described electric automobile power battery is full of electricity.
9. the battery charge controller for electric automobile power battery according to claim 8, it is characterized in that, if described electricity judge module judges that described electric automobile power battery is full of electricity, then described controller controls described current transformer and does not charge to described electric automobile power battery.
CN201010577019.4A 2010-11-30 2010-11-30 For charge control method and the device of electric automobile power battery CN102479983B (en)

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CN103117421A (en) * 2013-03-07 2013-05-22 清华大学 Low-temperature battery charging method
CN104124482B (en) * 2013-04-28 2017-10-10 华为终端有限公司 A kind of charging method, device and electronic equipment
US9862287B2 (en) 2013-06-28 2018-01-09 Byd Company Limited Power system for electric vehicle, electric vehicle and motor controller
CN104249629B (en) 2013-06-28 2016-09-07 比亚迪股份有限公司 Electric automobile, the dynamical system of electric automobile and the charging method of electrokinetic cell
CN104779652B (en) * 2014-01-09 2017-01-25 同济大学 Power battery charger by using AC charging and discharging for quick preheating
CN104935020B (en) * 2014-03-17 2017-09-29 比亚迪股份有限公司 Wireless charging system and wireless charging method for electric automobile
CN105337381B (en) * 2014-08-07 2019-06-21 镇江利明电器有限公司 Intelligent alternating current-direct current turns off electric car charger entirely
CN105098272B (en) * 2015-07-13 2017-07-18 惠州亿纬锂能股份有限公司 A kind of safe lithium secondary battery charging method
CN105223460A (en) * 2015-09-18 2016-01-06 苏州工业园区职业技术学院 A kind of pick-up unit of electrokinetic cell exception
JP6776611B2 (en) * 2016-05-16 2020-10-28 スズキ株式会社 Vehicle battery control
CN106602168A (en) * 2016-12-01 2017-04-26 安徽鸿创新能源动力有限公司 Thermal management system for battery pack of electric vehicle and control method
CN109216794A (en) * 2017-06-29 2019-01-15 青岛恒金源电子科技有限公司 A kind of operation method of base station battery pack

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