CN103779624A - Lithium titanate battery pack charging method - Google Patents
Lithium titanate battery pack charging method Download PDFInfo
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- CN103779624A CN103779624A CN201310705031.2A CN201310705031A CN103779624A CN 103779624 A CN103779624 A CN 103779624A CN 201310705031 A CN201310705031 A CN 201310705031A CN 103779624 A CN103779624 A CN 103779624A
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- charging
- current
- battery pack
- bms
- lithium titanate
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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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- 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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium titanate battery pack charging method. According to the method, the dump energy an optimal charging current corresponding to the current temperature of the battery pack are stored in a list, before charging each time, a BMS (Battery Management System) firstly detects the dump energy and current temperature information of the battery pack and checks the list to find the corresponding optimal charging current which is primary demanded current value to be sent. In each charging process, the BMS intermittently sends charging demand information to a battery charger, the battery charger charges the battery pack according to the demanded current value in the charging demand information; when the BMS detects that the highest unit voltage in the pack reaches the highest allowable charging voltage, the current of the battery charger is reduced to be lowest, and the current charging is stopped, and BMS then sends the charging demand information again; the BMS sends the demanded current value in the charging demand information to the battery charger by adopting a ladder type lowering manner until the fully charging is achieved. According to the method, the successfully full charging of the battery pack can be ensured, and the prolonging of the service life of the battery pack is facilitated.
Description
Technical field
The present invention relates to battery boosting technology field, particularly the charging method of lithium titanate battery group.
Background technology
In GB, DC charging is all carried out according to the charging strategy of constant voltage after first constant current.Due to high security, high stability, long-life and the environmental protection of lithium titanate, can predict and can become the negative material of lithium ion battery of new generation in the near future and be widely used in new-energy automobile, battery-operated motor cycle and require high security, high stability and macrocyclic application.But during due to lithium titanate battery group constant current charge; need to adopt the large electric current of 2C-6C to charge; therefore in the time transferring the constant-pressure drop current charge stage to; fall and flow through Cheng Zhongchang meeting because electric current is very large; the cell ceiling voltage range of decrease is very little; will soon be reduced to so minimum charging cut-off current, cause charging be not charged to very full in charging just stop.
Summary of the invention
For overcoming the shortcomings and deficiencies of above-mentioned prior art, the invention provides a kind of lithium titanate battery group charging method.
The technical solution adopted in the present invention is as follows: a kind of lithium titanate battery group charging method, it is in each charging process, send charging demand information by BMS intermittence to charger, charger charges to battery pack according to demand current value in charging demand information; In BMS detects group, high monomer cell voltage reaches set point, charger keeps current reduction to set after the charging interval to reduced-current, again judge in group whether high monomer cell voltage is more than or equal to the maximum charging voltage that allows, finish in this way current charging, wait for that BMS again sends charging demand information and carries out next stage charging; Otherwise the demand current while continuing to adopt this charging to start is charged; BMS sends to charger the mode that the demand current value in charging demand information adopts staged to decline, until be full of.
Preferably, by battery pack dump energy and the corresponding optimal charge electric current of Current Temperatures list storage, before the each charging of BMS, first detect battery pack dump energy and Current Temperatures information and table look-up and find corresponding optimal charge electric current as the charging of demand current value transmission first demand information.
Preferably, in the time that battery pack temperature is less than 15 ℃, first adopt 40-70A current charges 5-10 minute; When battery pack temperature is during at-15～0 ℃, demand current value is from 240A first; Be greater than 50 ℃ at the charging initial stage as battery pack temperature detected, directly fall and flow to 380A and charge.
Preferably, BMS detects that when high monomer voltage reaches set point in group, need continue 3-4S carries out subsequent operation again.
Concrete, described set point is 2.6-2.80V; Described reduced-current is 5-8A; The described setting charging interval is 5-10S; The amplitude that described staged declines is 30-60A.
Preferably, also comprise the correction step of battery pack calibration value, modification method is: if meet battery pack SOC >=95%, demarcate cell integrated SOC100% and demarcate and be full of; If SOC is less than 95%, then judge whether the average voltage of all monomer voltages is more than or equal to the rated voltage of the type battery core, if so, demarcating cell integrated SOC is that 100% demarcation is full of.
Compared with prior art, beneficial effect of the present invention is: (1) adopts clearance-type charging, charge normal fall stream phase transition in, adopt the clearance-type charging of little electric current, can allow the voltage of the battery state that tends to be steady, flow down one-phase charging and can be filled with electric weight more so that fall, can make again the unlikely demand current of sending because of BMS of charger too small, and reach the set charging stop condition of charger, thus stop charging, guarantee the full level of battery;
(2) adopt staged to fall stream mode and charge and can guarantee that battery can be full of, and staged stream falls and also can be by controlling the number of ladder, thereby control flexibly the condition of charging interval and charge capacity.Battery be filled with electric weight number, be mainly subject to lower-order ladder be the low current charge stage arrange impact; In the battery charging interval, being mainly subject to higher-order ladder is the impact in large current charge stage;
(3) according to battery Daily temperature range, charging current is adjusted in real time, avoided temperature too low or carry out large current charge when too high battery life is impacted, extend battery.
Accompanying drawing explanation
The embodiment flow chart of Fig. 1 lithium titanate battery group of the present invention charging method.
Embodiment
Understand technology contents of the present invention for convenience of those skilled in the art, below in conjunction with embodiment, the present invention is described in further detail.
As shown in Figure 1, in this embodiment, described lithium titanate battery group charging method, each charging process is divided into seven stages, and generally, demand charging current is made as A1 first, fall stream amplitude is 30-60A at every turn, and the electric current while leaving standstill buffering is made as I, and standing buffer time is T.And need before charging at every turn, need to detect battery pack dump energy and Current Temperatures information and table look-up and find corresponding optimal charge electric current as the charging of demand current value transmission first demand information, then set from the stage of demand current starts execution, execution step below successively first according to the following stage.
First stage, BMS charging demand current is A1, and when being charged to BMS and high monomer voltage >=2.75V being detected, charging current is reduced to I, keeps I charging T second.
Second stage, BMS sends charging demand information demand current to charger again and reduces to A2, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
Phase III, BMS sends charging demand information demand current A3 to charger again, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
Fourth stage, BMS sends charging demand information to charger again, demand current A4, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
Five-stage, BMS sends charging demand information to charger again, demand current A5, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
The 6th stage: BMS sends charging demand information to charger again, demand current A6, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
In the 7th stage, BMS sends charging demand information to charger again, demand current A7, until BMS is when high monomer voltage >=2.75V detected, charging current is reduced to I, keeps I charging T second.
In the 8th stage, BMS sends " charging termination information " to charger.
Above-mentioned eight stages can be adjusted according to battery pack actual conditions, first demand charging current, stream amplitude is fallen at every turn, leave standstill when buffering electric current, leave standstill buffer time etc. and also see and set according to battery pack concrete condition, after setting, write BMS program, when battery pack need be charged, carry out according to this setting situation.
Following table has provided the form of a battery pack temperature and initial charge demand current corresponding to dump energy:
Revising battery pack calibration value is in order to provide comparatively directly perceived and understandable electric weight to indicate to client.Modification method is: if meet battery pack SOC >=95%, demarcate cell integrated SOC100% and demarcate and be full of; If SOC is less than 95%, then judge whether the average voltage of all monomer voltages is more than or equal to the rated voltage of the type battery core, if so, demarcating cell integrated SOC is that 100% i.e. demarcation is full of.
Above-described embodiment is only wherein specific implementation of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (10)
1. a lithium titanate battery group charging method, is characterized in that, in each charging process:
BMS intermittence sends charging demand information to charger, and charger charges to battery pack according to demand current value in charging demand information;
In BMS detects group, high monomer cell voltage reaches set point, charger keeps current reduction to set after the charging interval to reduced-current, again judge in group whether high monomer cell voltage is more than or equal to the maximum charging voltage that allows, finish in this way current charging, wait for that BMS again sends charging demand information and carries out next stage charging; Otherwise the demand current while continuing to adopt this charging to start is charged;
BMS sends to charger the mode that the demand current value in charging demand information adopts staged to decline, until be full of.
2. lithium titanate battery group charging method according to claim 1, it is characterized in that: by battery pack dump energy and the corresponding optimal charge electric current of Current Temperatures list storage, before the each charging of BMS, first detect battery pack dump energy and Current Temperatures information and table look-up and find corresponding optimal charge electric current as the charging of demand current value transmission first demand information.
3. lithium titanate battery group charging method according to claim 2, is characterized in that: in the time that battery pack temperature is less than 15 ℃, first adopt 40-70A current charges 5-10 minute.
4. lithium titanate battery group charging method according to claim 3, is characterized in that: when battery pack temperature is during at-15～0 ℃, demand current value is from 240A first.
5. lithium titanate battery group charging method according to claim 3, is characterized in that: be greater than 50 ℃ at the charging initial stage as battery pack temperature detected, directly fall and flow to 380A and charge.
6. lithium titanate battery group charging method according to claim 1, is characterized in that: BMS detects in group that high monomer voltage reaches set point and need continue 3-4S and carry out subsequent operation again; Described set point is 2.6-2.80V.
7. lithium titanate battery group charging method according to claim 1, is characterized in that: described reduced-current is 5-8A.
8. lithium titanate battery group charging method according to claim 1, is characterized in that: the described setting charging interval is 5-8S.
9. lithium titanate battery group charging method according to claim 1, is characterized in that: the amplitude that described staged declines is 30-60A.
10. lithium titanate battery group charging method according to claim 1, is characterized in that: also comprise the correction step of battery pack calibration value, modification method is: if meet battery pack SOC >=95%, demarcate cell integrated SOC100% and demarcate and be full of; If SOC is less than 95%, then judge whether the average voltage of all monomer voltages is more than or equal to the rated voltage of the type battery core, if so, demarcating cell integrated SOC is that 100% i.e. demarcation is full of.
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| CN201310705031.2A CN103779624B (en) | 2013-12-20 | 2013-12-20 | A kind of lithium titanate battery group charging method |
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| CN201310705031.2A CN103779624B (en) | 2013-12-20 | 2013-12-20 | A kind of lithium titanate battery group charging method |
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| CN103779624A true CN103779624A (en) | 2014-05-07 |
| CN103779624B CN103779624B (en) | 2016-08-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852441A (en) * | 2015-06-12 | 2015-08-19 | 安徽江淮汽车股份有限公司 | Vehicle-mounted charging control method for lithium battery pack |
| CN109270465A (en) * | 2018-11-01 | 2019-01-25 | 桑顿新能源科技有限公司 | A kind of charging time evaluation method considering temperature rise |
| CN109828213A (en) * | 2019-02-01 | 2019-05-31 | 汉腾汽车有限公司 | A kind of processing method of SOC prediction processing module |
| CN113401006A (en) * | 2021-07-06 | 2021-09-17 | 山东元齐新动力科技有限公司 | Vehicle-mounted lithium battery charging method and system |
| CN115825781A (en) * | 2022-01-19 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Charging time determination method, BMS, battery and electric energy equipment |
| WO2023072051A1 (en) * | 2021-10-28 | 2023-05-04 | 中国第一汽车股份有限公司 | Charging method and apparatus for lithium-ion battery, medium and vehicle |
| CN116526641A (en) * | 2023-07-05 | 2023-08-01 | 合肥华思***有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852441A (en) * | 2015-06-12 | 2015-08-19 | 安徽江淮汽车股份有限公司 | Vehicle-mounted charging control method for lithium battery pack |
| CN109270465A (en) * | 2018-11-01 | 2019-01-25 | 桑顿新能源科技有限公司 | A kind of charging time evaluation method considering temperature rise |
| CN109828213A (en) * | 2019-02-01 | 2019-05-31 | 汉腾汽车有限公司 | A kind of processing method of SOC prediction processing module |
| CN113401006A (en) * | 2021-07-06 | 2021-09-17 | 山东元齐新动力科技有限公司 | Vehicle-mounted lithium battery charging method and system |
| WO2023072051A1 (en) * | 2021-10-28 | 2023-05-04 | 中国第一汽车股份有限公司 | Charging method and apparatus for lithium-ion battery, medium and vehicle |
| CN115825781A (en) * | 2022-01-19 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Charging time determination method, BMS, battery and electric energy equipment |
| CN115825781B (en) * | 2022-01-19 | 2024-02-20 | 宁德时代新能源科技股份有限公司 | Charging time determining method, BMS, battery and electric energy device |
| CN116526641A (en) * | 2023-07-05 | 2023-08-01 | 合肥华思***有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
| CN116526641B (en) * | 2023-07-05 | 2023-09-19 | 合肥华思***有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
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| CN103779624B (en) | 2016-08-24 |
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