CN105742738B - By adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity - Google Patents
By adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity Download PDFInfo
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- CN105742738B CN105742738B CN201610067517.1A CN201610067517A CN105742738B CN 105742738 B CN105742738 B CN 105742738B CN 201610067517 A CN201610067517 A CN 201610067517A CN 105742738 B CN105742738 B CN 105742738B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides it is a kind of by adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity, belong to cell art, including battery is demarcated, DC internal resistance of the measurement battery in relatively low state-of-charge different temperatures；Discharge curve of the battery under different temperatures, different multiplying, different radiating conditions is obtained, due to voltage recovery point caused by coupled thermomechanics effect when obtaining battery low temperature discharge from discharge curve；The current temperature of battery is obtained, according to the internal resistance at different temperatures of the discharge-rate of battery, battery and the voltage recovery point of battery discharge curve, adjusts the discharge cut-off voltage of battery.According to the low temperature discharge method of the present invention, battery can be preferably used at low temperature, battery is released more electricity.
Description
Technical field
The invention belongs to cell art, more particularly to one kind is by adjusting battery discharge blanking voltage to increase low temperature
The method of discharge capacity.
Background technology
Lithium ion battery has the advantages that energy density is high, had extended cycle life, self-discharge rate is low, memory-less effect, with lead
Sour battery, Ni-MH battery are compared, more preferably the main drive as pure electric automobile, plug-in electromobile and hybrid vehicle
Dynamic power supply, and the energy-storage travelling wave tube that mobile phone, notebook computer etc. are main.However, all kinds of impedances of inside lithium ion cell under low temperature
It is significantly increased, even the battery of highly charged state discharges at low temperature, according to the electric discharge code of normal temperature, the electricity that can be released
Amount is also less, and available power reduces；Use under lithium ion battery low temperature has difficulties.
Problem is used currently for the low temperature of battery, is generally started with engineer applied from the angle of battery preheating, by outer
Portion preheats or the method for internal preheating, and the temperature of battery is improved, then is used.Although the method for battery preheating can be from root
Solve the problems, such as the use of battery low temperature in sheet, but need extra exploitation heating strategy and hardware, expend extra preheating time；It is logical
The method of normal battery preheating is more effective for the low temperature charging problems of battery.Electric discharge service condition for battery, it is desirable to
There is a kind of simple and efficient low temperature discharge method, ensure the low temperature discharge ability of battery, improve the low temperature discharge capacity of battery.
The content of the invention
The present invention is for overcome the deficiencies in the prior art, it is proposed that one kind is by adjusting battery discharge blanking voltage to increase
The method of low temperature discharge capacity, can be by adjusting under battery low temperature discharge operating mode according to the low temperature discharge method of the present invention
Discharge cut-off voltage, change the electric discharge code of battery, battery is released more electricity.
The purpose of the present invention is realized using following technical proposals：
It is proposed by the present invention a kind of by adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity, mainly
Comprise the following steps：
1) battery is demarcated, measurement battery is in relatively low state-of-charge (State of Charge, SOC) different temperatures
The DC internal resistance of (especially under low temperature)；
2) discharge curve of the battery under different temperatures, different multiplying, different radiating conditions is obtained, and from discharge curve
Due to voltage recovery point caused by coupled thermomechanics effect when obtaining battery low temperature discharge；
3) the current temperature of battery is obtained, according to the internal resistance at different temperatures of the discharge-rate of battery, battery and electricity
The voltage recovery point of pond low temperature discharge curve, adjust the discharge cut-off voltage of battery；
DC internal resistance method of testing in step 1) can have the methods of current step, potential step, electric current interruption.
The method that the acquisition methods of battery low temperature discharge curve and voltage recovery point can use experimental calibration in step 2),
The discharging model of the temperature coupling of battery can also be established, is calculated and obtained by model.
Step 3) adjustment battery discharge blanking voltage method be：Vcut,LT=Vcut,RT-a×(RLT-RRT) × I, and ensure
Vcut,LT<Vturn.Wherein Vcut,LTIt is low temperature discharge blanking voltage, Vcut,RTIt is normal temperature discharge cut-off voltage, RLTIt is low lotus under low temperature
Electricity condition internal resistance, RRTIt is low state-of-charge internal resistance under normal temperature, a is regulation coefficient, and I is discharge current, VturnIt is voltage recovery point.
That is, under worst cold case, the discharge cut-off voltage of battery is reduced according to the increase of the internal resistance of cell, while ensures the electric discharge cut-off of battery
Voltage is under the voltage recovery point of battery discharge curve.
Also include in step 3), monitor the temperature and discharge current of battery in real time, record the discharge electricity amount of battery, adjust in real time
The discharge cut-off voltage of whole battery and electric discharge deadline, while more preferable using effect is reached, avoid battery from crossing and put.
Brief description of the drawings
Fig. 1 be the present invention by adjusting battery discharge blanking voltage to increase the method flow diagram of low temperature discharge capacity；
Fig. 2 is battery low temperature discharge and the comparison diagram that discharged under normal temperature in embodiments of the invention；
Fig. 3 is battery DC inner walkway schematic diagram in embodiments of the invention；
Fig. 4 is battery low temperature discharge curve and voltage recovery point schematic diagram in embodiments of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
It is proposed by the present invention a kind of by adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity, such as scheme
Shown in 1, mainly comprise the following steps：
1) battery is demarcated, measurement battery is in relatively low state-of-charge (State of Charge, SOC) different temperatures
The DC internal resistance of (especially under low temperature)；
2) discharge curve of the battery under different temperatures, different discharge-rates, different radiating conditions is obtained, from discharge curve
Due to voltage recovery point caused by coupled thermomechanics effect during middle acquisition battery low temperature discharge；
3) the current temperature value of battery is obtained, according to the DC internal resistance of the discharge-rate of battery, battery at different temperatures
And the voltage recovery point of battery low temperature discharge curve, adjust the discharge cut-off voltage of battery.
The method of the DC internal resistance of measurement battery, can use current step, potential step or electric current in the step 1)
One kind in the methods of interruption.
The acquisition methods of battery discharge curve and voltage recovery point are established in the step 2), experimental calibration can be used
Method, the discharging model of the temperature coupling of battery can also be established, is calculated and obtained by model.
The method of adjustment battery discharge blanking voltage is in the step 3)：Vcut,LT=Vcut,RT-a×(RLT-RRT) × I,
And ensure Vcut,LT<Vturn.Wherein Vcut,LTIt is low temperature discharge blanking voltage, Vcut,RTIt is normal temperature discharge cut-off voltage, RLTIt is low temperature
Under low state-of-charge internal resistance, RRTIt is low state-of-charge internal resistance under normal temperature, a is regulation coefficient, and I is discharge current, VturnIt is voltage
Springing point.Basic ideas are, according to the increase of the internal resistance of cell under low temperature and discharge current size, to reduce low temperature discharge cut-off electricity
Pressure, and according to actual conditions needs, be adjusted with regulation coefficient a；Ensure that the discharge cut-off voltage of battery is put in battery simultaneously
Under the voltage recovery point of electric curve.
Also include in step 3, monitor the temperature and discharge current of battery in real time, record the discharge electricity amount of battery, adjust in real time
The discharge cut-off voltage of whole battery and electric discharge deadline, while more preferable using effect is reached, avoid battery from crossing and put.
During due to battery low temperature discharge, own temperature also changes, and need to monitor the temperature and discharge current of battery in real time,
And battery discharge electricity is recorded, according to the initial charge state of battery, the discharge cut-off voltage and electric discharge for adjusting battery in real time are cut
The only time, while more preferable using effect is reached, avoid battery from crossing and put.
The discharge curve comparison diagram of multiplying power identical with normal temperature is as shown in Fig. 2 solid line is 25 DEG C of 1C multiplying powers under battery low temperature
Discharge curve, dotted line is the discharge curve of -20 DEG C of 1C multiplying powers, due to the impedance increase of battery at low temperature, according to it is normal
Identical discharge cut-off voltage when warm, cell voltage can more early reach discharge cut-off voltage during low temperature discharge, terminate discharge process,
Cause to be drastically reduced with discharge capacity under low temperature.Therefore, it is possible to adjust the discharge cut-off voltage under battery low temperature discharge, make more
Multicapacity can be utilized.The present invention proposes a kind of embodiment, specifically includes following steps：
Step 1) is demarcated to battery, and measurement battery is in relatively low state-of-charge, such as 10%SOC, 0%SOC, different temperatures
The DC internal resistance of (especially under low temperature, such as -20 DEG C, -10 DEG C, 0 DEG C)；
The present embodiment measures battery in relatively low state-of-charge, different temperatures (especially low temperature using discharge current step method
Under) DC internal resistance；Battery DC internal resistance in the present embodiment under different temperatures under the low state-of-charge of battery, as shown in Figure 3.Figure
3 (a) applies the curve of electric current over time, and Fig. 3 (b) is the voltage change curve at corresponding moment.Measure battery DC internal resistance
Comprise the following steps that：Record certain moment water-fast voltage V0, from this moment, apply the size of current of a t1 times to battery
For I discharge pulse, cell voltage can decline, and take the cell voltage V at t2 momentt2, the calculation formula of DC internal resistance is：R=
(V0-Vt2)/I。
T2 numerical value selection is required to include all kinds of impedances of battery as far as possible：Ohmage, Charge-transfer resistance, diffusion resistance
The reaction time of anti-grade.
In one embodiment, t1 120s, discharge pulse current size are 0.5C, t2 60s.The low charged shape of battery
State can be 10%SOC.
Step 2) obtains discharge curve of the battery under different temperatures, different discharge-rates, different radiating conditions, and from putting
Voltage recovery point during battery low temperature discharge is obtained in electric curve；
The present embodiment establishes the acquisition methods of battery discharge curve and voltage recovery point, this reality using the method for experimental calibration
Apply discharge curve schematic diagram of the battery under -20 DEG C of low temperature in example, and the acquisition example of voltage recovery point is as shown in Figure 4.In electricity
During the low temperature discharge of pond, because coupled thermomechanics act on, battery discharge heat production, temperature rise, internal resistance of cell reduction；Discharge curve
In often there is voltage recovery point, such as the V in Fig. 4turn.Voltage recovery point is that a comparison is closed during battery low temperature discharge
The point of key, if it is possible to voltage recovery phenomenon occur, battery just has an opportunity to release more capacity；If on the contrary, returned in voltage
Default discharge cut-off voltage is just reached before rising point, has finished to discharge, the discharge capacity of battery can greatly reduce.Such as Fig. 4
In, if discharge cut-off voltage is arranged to V1, then discharge capacity is Q1.If discharge cut-off voltage is arranged to below voltage recovery point
V2, then the voltage recovery phenomenon under coupled thermomechanics effect can be made full use of, discharge capacity is risen to Q2。
In specific implementation process, the system of selection of voltage recovery point is the extreme point of discharge voltage profile, i.e. electric discharge electricity
Pressure is changed into the point of ascendant trend by downward trend, such as the V in Fig. 4turn。
Step 3) obtains the current temperature value of battery, according to the direct current of the discharge-rate of battery, battery at different temperatures
Internal resistance and the voltage recovery point of battery low temperature discharge curve, adjust the discharge cut-off voltage of battery.
The method of the present embodiment is specially：According to adjustment formula Vcut,LT=Vcut,RT-a×(RLT-RRT) × I, and ensure
Vcut,LT<Vturn.Such as：Vcut,LTIt is -20 DEG C of discharge cut-off voltages to be determined, Vcut,RTIt is 25 DEG C of discharge cut-off voltages of normal temperature,
3V, RLTIt is -20 DEG C of 10%SOC states internal resistances 0.05 Ω, RLTIt is that 10%SOC internal resistances 0.005 Ω, a are regulation coefficients at 25 DEG C,
It is discharge current to take 0.5, I, 25A, VturnIt is voltage recovery point, is 2.9V, is then calculated according to formula, -20 DEG C of electric discharge cut-off electricity
Press Vcut,LTIt can be taken as 2.5V.
The present embodiment also includes, and monitors the temperature and discharge current of battery in real time, records the discharge electricity amount of battery, can be real-time
According to above-mentioned steps 3) in method adjustment battery discharge cut-off voltage and electric discharge deadline, reaching preferably using effect
While fruit, avoid battery from crossing and put, such as avoid the discharge electricity amount of battery from exceeding the marked capacity of battery.
It should be noted that the associated exemplary and numerical value enumerated in the present embodiment, it is impossible to limitation of the present invention is interpreted as,
One of ordinary skill in the art within the scope of the invention can be right in the case where not departing from the principle and objective of the present invention
Above-described embodiment is changed, changed, replacing and modification.
Claims (4)
1. it is a kind of by adjusting battery discharge blanking voltage to increase the method for low temperature discharge capacity, it is characterised in that including：
1) battery is demarcated, DC internal resistance of the measurement battery in relatively low state-of-charge different temperatures；
2) discharge curve of the battery under different temperatures, different discharge-rates, different radiating conditions is obtained, is obtained from discharge curve
Due to voltage recovery point caused by coupled thermomechanics effect during the low temperature discharge of power taking pond；
3) obtain the current temperature value of battery, according to the discharge-rate of battery, battery DC internal resistance at different temperatures and
The voltage recovery point of battery low temperature discharge curve, adjust the discharge cut-off voltage of battery；
The specific method of adjustment of discharge cut-off voltage for adjusting battery is：Vcut,LT=Vcut,RT-a×(RLT-RRT) × I, and ensure
Vcut,LT<Vturn；Wherein Vcut,LTIt is low temperature discharge blanking voltage, Vcut,RTIt is normal temperature discharge cut-off voltage, RLTIt is low lotus under low temperature
Electricity condition internal resistance, RRTIt is low state-of-charge internal resistance under normal temperature, a is regulation coefficient, and I is discharge current, VturnIt is voltage recovery point.
2. method as claimed in claim 1, it is characterised in that the step 1) measures battery in the direct current of relatively low state-of-charge
Resistance method is interrupted one kind of method using current step, potential step or electric current.
3. method as claimed in claim 1, it is characterised in that the step 2) obtains battery in different temperatures, different multiplying, no
Acquisition methods with the discharge curve under radiating condition use the method for experimental calibration, or establish the electric discharge of the temperature coupling of battery
Model, calculated and obtained by model.
4. method as claimed in claim 1, it is characterised in that also include in the step 3), in real time monitor battery temperature and
Discharge current, the discharge electricity amount of battery is recorded, adjust discharge cut-off voltage and the electric discharge deadline of battery in real time, reaching more
While the using effect got well, avoid battery from crossing and put.
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| CN107275689A (en) * | 2017-05-10 | 2017-10-20 | 宁波动电器有限公司 | A kind of lithium battery pack low-temperature start method and system and a kind of controller |
| CN109216789A (en) * | 2017-06-29 | 2019-01-15 | 青岛恒金源电子科技有限公司 | A kind of Vehicular dynamic battery group |
| CN111129626B (en) * | 2018-10-30 | 2021-10-22 | 宏碁股份有限公司 | Low-voltage threshold adjusting method |
| CN109980309B (en) * | 2019-04-17 | 2020-09-04 | 郑州轻工业学院 | Overload-prevention power battery charging and discharging supervision control method |
| CN110010934B (en) * | 2019-04-19 | 2021-11-19 | 山东科技大学 | Method for measuring resistance of electrolyte of flow battery on line |
| CN110221222B (en) * | 2019-04-30 | 2022-03-29 | 蜂巢能源科技有限公司 | Battery safety cut-off voltage prediction method and device and battery management system |
| CN112311038B (en) * | 2019-07-31 | 2023-04-18 | 荣耀终端有限公司 | Charging and discharging protection circuit, terminal equipment and battery discharging control method |
| CN110994052B (en) * | 2019-12-14 | 2021-07-02 | 惠州Tcl移动通信有限公司 | Method and device for prolonging battery endurance, storage medium and terminal equipment |
| CN111158450A (en) * | 2019-12-30 | 2020-05-15 | 联想(北京)有限公司 | Information processing method and device |
| CN111030249B (en) * | 2019-12-30 | 2022-05-31 | 联想(北京)有限公司 | Cut-off voltage control method and electronic equipment |
| CN111446514A (en) * | 2020-03-17 | 2020-07-24 | 上海理工大学 | Method for reasonably adjusting discharge cut-off voltage of lithium battery along with service life attenuation of battery |
| CN111332153A (en) * | 2020-03-19 | 2020-06-26 | 银隆新能源股份有限公司 | Battery charging and discharging control method and device, storage medium and processor |
| CN111430795B (en) * | 2020-03-31 | 2021-06-04 | 宁德新能源科技有限公司 | Electrochemical device and electronic device comprising same |
| CN111613843B (en) * | 2020-05-29 | 2021-04-02 | 重庆金康新能源汽车有限公司 | Method and system for modifying discharge C-rate of battery in electric vehicle |
| CN112054256B (en) * | 2020-08-21 | 2023-01-20 | 山东电子职业技术学院 | Battery control method based on low-temperature discharge curve of lithium battery in wide temperature environment |
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| JP4759795B2 (en) * | 2000-09-28 | 2011-08-31 | 株式会社Ｇｓユアサ | Rechargeable battery remaining capacity detection method |
| US7525285B2 (en) * | 2004-11-11 | 2009-04-28 | Lg Chem, Ltd. | Method and system for cell equalization using state of charge |
| US7768233B2 (en) * | 2007-10-04 | 2010-08-03 | Gm Global Technology Operations, Inc. | Dynamically adaptive method for determining the state of charge of a battery |
| CN101303397A (en) * | 2008-06-25 | 2008-11-12 | 河北工业大学 | Method and apparatus for computing lithium ion batteries residual electric energy |
| CN102830361B (en) * | 2012-08-24 | 2015-01-28 | 海能达通信股份有限公司 | Battery capacity quick detection method and battery capacity quick detection system |
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