CN109546704A - A kind of power battery fast charge method - Google Patents
A kind of power battery fast charge method Download PDFInfo
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- CN109546704A CN109546704A CN201811445615.XA CN201811445615A CN109546704A CN 109546704 A CN109546704 A CN 109546704A CN 201811445615 A CN201811445615 A CN 201811445615A CN 109546704 A CN109546704 A CN 109546704A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H02J7/0091—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of power battery fast charge method comprising: fast charge parameter calibration includes: the progress charging capacity calibration at 25 DEG C；According to the charging capacity, the maximum voltage of battery under SOC80% is demarcated；The fast charge execution includes: to control temperature charging limit electric current according to battery temperature, voltage charging limit electric current is controlled according to cell voltage, and take the lesser conduct fast charge charging current limiter electric current of numerical value in the temperature charging limit electric current and the voltage charging limit electric current, it fully considers vehicle service life and cell health state, in conjunction with fast charge calibration and vehicle fast charge strategy, power battery safety, life performance are ensured.
Description
Technical field
The present invention is about a kind of power battery fast charge method.
Background technique
As global problem of environmental pollution seriously aggravates, new-energy automobile worldwide obtains government, vehicle is reached section
The great attention of mechanism is ground, mainly using electric energy as power source, advantage is to reduce discharge new-energy automobile.Power battery is as new
The core component of energy automobile, the length in charging time directly affect the car experience of user, and fast charge technology is come into being.Fastly
The technology of filling is quickly to increase the charged shape of battery pack in the case where not influencing cycle performance of battery and whole driving performance
State.The use of vehicle fast charge multiplying power directly affects the performances such as service life, the safety of power battery, and how science formulates a kind of power
Battery fast charge strategy, it is ensured that vehicle safe handling be the invention solves a significant problem.
Currently, in most of main engine plants' fast charge strategies, in SOC0-80% using one constant times it is blunt be charged to SOC80%,
Then it takes constant-pressure drop current system to be charged to SOC100%, shortens the charging time, improve user experience.But main engine plants' electric car
Do not consider battery and security performance in fast charge strategy comprehensively, and fast charge number is limited.
Abbreviation commonly used in the art:
SOH: the health degree (State of Health) of battery refers under certain condition, battery can be filled with or put
The percentage of capacity and nominal capacity out.
SOC: the state-of-charge (State of Charge) of battery reflects the residual capacity situation of battery.
Summary of the invention
The object of the present invention is to provide the battery pack fast charge strategies that a kind of safety, charging time are short, fully consider that vehicle makes
Power battery safety, life performance are ensured in conjunction with fast charge calibration and vehicle fast charge strategy with service life and cell health state.
To realize the above-mentioned technical purpose, the present invention provides a kind of power battery fast charge method, and step includes: fast charge parameter
Calibration and fast charge execute, in which: the fast charge parameter calibration includes: the progress charging capacity calibration at 25 DEG C；It is filled according to described in
Capacitance demarcates the maximum voltage (Vmax) of battery under SOC80%；The fast charge execution includes: to control temperature according to battery temperature
Charging limit electric current is spent, voltage charging limit electric current is controlled according to cell voltage, and take the temperature charging limit electric current and institute
It states numerical value in voltage charging limit electric current lesser one and is used as fast charge charging current limiter electric current.
The present invention provides a kind of safety, charging time short battery pack fast charge strategy, fully consider vehicle service life and
Cell health state ensures power battery safety, life performance in conjunction with fast charge calibration and vehicle fast charge strategy.With power battery
Service life premised on safety, demarcates fast charge parameter, formulates the fast charge strategy of science.Fast charge strategy need to comprehensively consider charging starting temperature
Degree, battery SOC deviation, the factors such as cell voltage.
As a further improvement, the charging capacity calibration includes: the minimum electricity with 1C constant-current discharge to the battery
Pressing (Vmin) is 2.3V, stands 30min；It is with the maximum voltage (Vmax) of 0.85C constant-current charge to the battery
3.54V；The voltage of the battery is charged to as 3.64V with 0.5C, and charges to 3.64V through dropping electric current 25A；It is filled with 17A constant current
The limiting voltage (Vlim) of electricity to the battery is 3.65V；The charging capacity is recorded, 30min is stood.
As a further improvement, the maximum voltage (Vmax) of battery includes: with 0.85C perseverance under the calibration SOC80%
Current charge drops to 10A, the limiting voltage (Vlim) for being filled to the battery is 3.65V to SOC80%；Record SOC80%
The maximum voltage (Vmax) of the corresponding battery stands 30min.
As a further improvement, at the calibration SOC80% after the maximum voltage (Vmax) of battery, further includes:
The minimum voltage (Vmin) to the battery is vented as 2.3V with 1C, stands 30min.
As a further improvement, it is described according to battery temperature control temperature charging limit electric current include: according to the electricity
The minimum temperature (Tmin) and maximum temperature (Tmax) in pond select the temperature charging limit electric current；Electricity is controlled according to cell voltage
Pressure charging limit electric current includes: cell voltage described in comparison (V) and temperature charging voltage (V1), and selects the voltage charging limit
Electric current processed.
As a further improvement, when the minimum temperature (Tmin) of the battery is less than or equal to 0 DEG C (Tmin≤0 DEG C),
Closed loop states in 0A；When the minimum temperature (Tmin) of the battery is less than or equal to 4 DEG C and is more than or equal to 1 DEG C (1 DEG C≤Tmin
≤ 4 DEG C) when, the closed loop states in 10A；When the minimum temperature (Tmin) of the battery is less than or equal to 14 DEG C and is more than or equal to 5
When DEG C (5 DEG C≤Tmin≤14 DEG C), the closed loop states in 20A；When the minimum temperature (Tmin) of the battery is more than or equal to 15
DEG C and, when the maximum temperature of the battery is less than or equal to 44 DEG C (15 DEG C≤Tmin, Tmax≤44 DEG C), closing in 72A*SOH
Ring status；When the maximum temperature (Tmax) of the battery is less than or equal to 48 DEG C and is more than or equal to 45 DEG C (45 DEG C≤Tmax≤48 DEG C)
When, the closed loop states in 30A；When the maximum temperature (Tmax) of the battery is more than or equal to 49 DEG C (49 DEG C≤Tmax), place
In the closed loop states of 0A.
As a further improvement, the obtaining value method of the temperature charging voltage (V1) are as follows: when the battery temperature is greater than
When equal to 25 DEG C, 3.540V is taken；When the battery temperature is less than or equal to 10 DEG C, 3.575V is taken；When the battery temperature is in
At 25 DEG C and 10 DEG C, pass through interpolation calculation value.
As a further improvement, it is landed vertically by electric current and executes following charging: when the cell voltage (V) is less than the temperature
When spending charging voltage (V1), the closed loop states in 72A*SOH；When the cell voltage (V) charges more than or equal to the temperature
Voltage (V1) and be less than 3.64V when, be reduced to the closed loop states of 42A*SOH；When the cell voltage (V) is more than or equal to 3.64V,
It is reduced to the closed loop states of 25A*SOH；Under conditions of keeping the cell voltage (V) to be more than or equal to 3.64V, from 25A*SOH's
Closed loop states are reduced to the closed loop states of 17A*SOH；When the cell voltage (V) is more than or equal to 3.65V, charging terminates.
As a further improvement, the fast charge execution is documented in VCU, and is controlled and executed by the VCU.
As a further improvement, the VCU sends charging current instruction and charging voltage is instructed to charging pile, described to fill
Piezoelectric voltage instruction is 400V, and the charging current instruction is maximum to be no more than 84A.
The present invention is with the power battery service life, premised on safety, demarcates fast charge parameter, formulates the fast charge strategy of science.Fast charge
Strategy need to comprehensively consider charging initial temperature, battery SOC deviation, the factors such as cell voltage.
Detailed description of the invention
Fig. 1 controls temperature charging limit electric current according to battery temperature；
Fig. 2 controls voltage charging limit electric current according to cell voltage.
Appended drawing reference: Tmin: minimum temperature；Tmax: maximum temperature；V: cell voltage；V1 temperature charging voltage.
Specific embodiment
As shown in Fig. 1 to 2, the present invention provides a kind of power battery fast charge method.Abbreviation commonly used in the art:
SOH: the health degree (State of Health) of battery refers under certain condition, battery can be filled with or put
The percentage of capacity and nominal capacity out.
SOC: the state-of-charge (State of Charge) of battery reflects the residual capacity situation of battery.
A kind of the step of power battery fast charge method provided by the present invention includes: that fast charge parameter calibration and fast charge execute,
In: the fast charge parameter calibration includes: the progress charging capacity calibration at 25 DEG C；According to the charging capacity, SOC80% is demarcated
The maximum voltage (Vmax) of lower battery；The fast charge execution includes: to control temperature charging limit electric current according to battery temperature, according to
Cell voltage controls voltage charging limit electric current, and takes in the temperature charging limit electric current and the voltage charging limit electric current
Numerical value lesser one is used as fast charge charging current limiter electric current.
The present invention provides a kind of safety, charging time short battery pack fast charge strategy, fully consider vehicle service life and
Cell health state ensures power battery safety, life performance in conjunction with fast charge calibration and vehicle fast charge strategy.With power battery
Service life premised on safety, demarcates fast charge parameter, formulates the fast charge strategy of science.Fast charge strategy need to comprehensively consider charging starting temperature
Degree, battery SOC deviation, the factors such as cell voltage.
As a further improvement, the charging capacity calibration includes: the minimum electricity with 1C constant-current discharge to the battery
Pressing (Vmin) is 2.3V, stands 30min；It is with the maximum voltage (Vmax) of 0.85C constant-current charge to the battery
3.54V；The voltage of the battery is charged to as 3.64V with 0.5C, and charges to 3.64V through dropping electric current 25A；It is filled with 17A constant current
The limiting voltage (Vlim) of electricity to the battery is 3.65V；The charging capacity is recorded, 30min is stood.
As a further improvement, the maximum voltage (Vmax) of battery includes: with 0.85C perseverance under the calibration SOC80%
Current charge drops to 10A, the limiting voltage (Vlim) for being filled to the battery is 3.65V to SOC80%；Record SOC80%
The maximum voltage (Vmax) of the corresponding battery stands 30min.
As a further improvement, at the calibration SOC80% after the maximum voltage (Vmax) of battery, further includes:
The minimum voltage (Vmin) to the battery is vented as 2.3V with 1C, stands 30min.
As a further improvement, it is described according to battery temperature control temperature charging limit electric current include: according to the electricity
The minimum temperature (Tmin) and maximum temperature (Tmax) in pond select the temperature charging limit electric current；Electricity is controlled according to cell voltage
Pressure charging limit electric current includes: cell voltage described in comparison (V) and temperature charging voltage (V1), and selects the voltage charging limit
Electric current processed.
As a further improvement, when the minimum temperature (Tmin) of the battery is less than or equal to 0 DEG C (Tmin≤0 DEG C),
Closed loop states in 0A；When the minimum temperature (Tmin) of the battery is less than or equal to 4 DEG C and is more than or equal to 1 DEG C (1 DEG C≤Tmin
≤ 4 DEG C) when, the closed loop states in 10A；When the minimum temperature (Tmin) of the battery is less than or equal to 14 DEG C and is more than or equal to 5
When DEG C (5 DEG C≤Tmin≤14 DEG C), the closed loop states in 20A；When the minimum temperature (Tmin) of the battery is more than or equal to 15
DEG C and, when the maximum temperature of the battery is less than or equal to 44 DEG C (15 DEG C≤Tmin, Tmax≤44 DEG C), closing in 72A*SOH
Ring status；When the maximum temperature (Tmax) of the battery is less than or equal to 48 DEG C and is more than or equal to 45 DEG C (45 DEG C≤Tmax≤48 DEG C)
When, the closed loop states in 30A；When the maximum temperature (Tmax) of the battery is more than or equal to 49 DEG C (49 DEG C≤Tmax), place
In the closed loop states of 0A.
As a further improvement, the obtaining value method of the temperature charging voltage (V1) are as follows: when the battery temperature is greater than
When equal to 25 DEG C, 3.540V is taken；When the battery temperature is less than or equal to 10 DEG C, 3.575V is taken；When the battery temperature is in
At 25 DEG C and 10 DEG C, pass through interpolation calculation value.
As a further improvement, it is landed vertically by electric current and executes following charging: when the cell voltage (V) is less than the temperature
When spending charging voltage (V1), the closed loop states in 72A*SOH；When the cell voltage (V) charges more than or equal to the temperature
Voltage (V1) and be less than 3.64V when, be reduced to the closed loop states of 42A*SOH；When the cell voltage (V) is more than or equal to 3.64V,
It is reduced to the closed loop states of 25A*SOH；Under conditions of keeping the cell voltage (V) to be more than or equal to 3.64V, from 25A*SOH's
Closed loop states are reduced to the closed loop states of 17A*SOH；When the cell voltage (V) is more than or equal to 3.65V, charging terminates.
As a further improvement, the fast charge execution is documented in VCU, and is controlled and executed by the VCU.
As a further improvement, the VCU sends charging current instruction and charging voltage is instructed to charging pile, described to fill
Piezoelectric voltage instruction is 400V, and the charging current instruction is maximum to be no more than 84A.
The present invention is with the power battery service life, premised on safety, demarcates fast charge parameter, formulates the fast charge strategy of science.Fast charge
Strategy need to comprehensively consider charging initial temperature, battery SOC deviation, the factors such as cell voltage.
In the preferred embodiment of the invention, it is based on vehicle fast charge time target, the SOC0-80% charging time controls in 1h
Interior, the SOC0-100% charging time controls in 1.5h, forms several different rate of charge and is charged to different SOC sections of fast charge sides
Case.Based on certain power battery fast charge scheme, in conjunction with service life performance, quantity of heat production and the security performance under its different rate of charge
Related datas such as (analysis lithiums), formulate the fast charge scheme of feasibility.
Such as Fig. 1 to 2, a kind of power battery fast charge method in the embodiment of the present invention, including the following contents:
One: fast charge policing parameter calibration: for 25 DEG C.
(1) 25 DEG C of capacity calibration: it is 2.3V with 1C constant-current discharge to monomer Vmin, stands 30min；It is filled with 0.85C constant current
Electricity is 3.54V (80%) to monomer Vmax, charges to 3.64V with 0.5C, drop electric current 25A is charged to 3.64V, filled with 17A constant current
Electricity records charging capacity, stands 30min to monomer Vmax3.65V；
(2) Vmax is demarcated under SOC80%: on the basis of charging capacity at 25 DEG C, SOC value is arranged.With 0.85C constant-current charge
To SOC80%, 10A is dropped to, is filled to monomer Vmax3.65V, the corresponding monomer Vmax of record SOC80% stands 30min；
(3) it is vented to monomer Vmin with 1C as 2.3V, stands 30min；
Two: fast charge strategy is realized: VCU software is written into fast charge strategy, it is single from battery temperature, the control of two dimension of cell voltage
Bulk charging electric current, it is ensured that power battery safe handling.
Wherein, temperature charging voltage V1 correspond to battery SOC be 80% or so, V1 parameter it is related with temperature, parameter list is such as
Under:
| Tmin/℃ | 25 | 10 |
| V1/V | 3.540 | 3.575 |
Remarks:
1) V1 is influenced by battery temperature Tmin, and Tmin takes 25 DEG C of point parameter values when being higher than 25 DEG C, takes 10 DEG C when lower than 10 DEG C
Parameter value passes through interpolation calculation value therebetween；
2) fast charge electric current takes both " temperature current limliting " and " voltage current limliting " smaller value；
3) it is got higher with monomer voltage, 72A*SOH (0.85C) is reduced to 42A*SOH (0.5C), 42A*SOH (0.5C) is reduced to
25A*SOH (0.3C), 25A*SOH (0.3C) are reduced to 17A*SOH (0.2C), are that electric current lands vertically；
4) VCU sends charging current in charging process, charging voltage is instructed to charging pile, and charging current is shown in upper analysis, fills
Piezoelectric voltage is 400V；
5) in charging process, the output current signal maximum that VCU is sent to charging pile is no more than 84A.
The present invention provides a kind of fast charge strategies for considering battery temperature, battery SOH, cell voltage comprehensively, can effectively comment
Estimate the fast charge function of power battery, shorten the power battery charging time, prompt user's car experience, those skilled in the art comes
It says, under the premise of not departing from strategy of the invention, various modifications and improvements can be made, and this alternative forms belong to the present invention
The key point protected in advance.The present invention can use the fast charge strategy that same procedure realizes matching different type battery, according to this side
Method finds out the charge-discharge characteristic, heat generation characteristic, battery capacity attenuation characteristic of battery.
It should be appreciated that invention which is intended to be protected is not limited to non-limiting embodiments, it should be understood that non-limiting embodiment party
Case is illustrated as just example.The protection scope of the desired essence of the application is more embodied in independent claims offer
Range and its dependent claims.
Claims (10)
1. a kind of power battery fast charge method, step includes: that fast charge parameter calibration and fast charge execute, it is characterised in that:
The fast charge parameter calibration includes: the progress charging capacity calibration at 25 DEG C；According to the charging capacity, calibration
The maximum voltage (Vmax) of battery under SOC80%；
The fast charge execution includes: to control temperature charging limit electric current according to battery temperature, controls voltage according to cell voltage and fills
Electricity limitation electric current, and take the lesser conduct of numerical value in the temperature charging limit electric current and the voltage charging limit electric current
Fast charge charging current limiter electric current.
2. a kind of power battery fast charge method as described in claim 1, it is characterised in that: the charging capacity, which is demarcated, includes:
With the minimum voltage (Vmin) of 1C constant-current discharge to the battery for 2.3V, 30min is stood；
With the maximum voltage (Vmax) of 0.85C constant-current charge to the battery for 3.54V；
The voltage of the battery is charged to as 3.64V with 0.5C, and charges to 3.64V through dropping electric current 25A；
With the limiting voltage (Vlim) of 17A constant-current charge to the battery for 3.65V；
The charging capacity is recorded, 30min is stood.
3. a kind of power battery fast charge method as claimed in claim 2, it is characterised in that: battery under the calibration SOC80%
Maximum voltage (Vmax) include:
With 0.85C constant-current charge to SOC80%, 10A is dropped to, the limiting voltage (Vlim) for being filled to the battery is
3.65V；
The maximum voltage (Vmax) of the corresponding battery of SOC80% is recorded, 30min is stood.
4. a kind of power battery fast charge method as claimed in claim 3, it is characterised in that: electric at the calibration SOC80%
After the maximum voltage (Vmax) in pond, further includes: it is vented to the minimum voltage (Vmin) of the battery with 1C as 2.3V, it is quiet
Set 30min.
5. a kind of power battery fast charge method as described in claim 1, it is characterised in that:
It is described that control temperature charging limit electric current according to battery temperature include: according to the minimum temperature (Tmin) of the battery and most
Big temperature (Tmax) selects the temperature charging limit electric current；
Controlling voltage charging limit electric current according to cell voltage includes: cell voltage described in comparison (V) and temperature charging voltage
(V1), and the voltage charging limit electric current is selected.
6. a kind of power battery fast charge method as claimed in claim 5, it is characterised in that:
When the minimum temperature (Tmin) of the battery is less than or equal to 0 DEG C (Tmin≤0 DEG C), the closed loop states in 0A；
When the minimum temperature (Tmin) of the battery is less than or equal to 4 DEG C and is more than or equal to 1 DEG C (1 DEG C≤Tmin≤4 DEG C), it is in
The closed loop states of 10A；
When the minimum temperature (Tmin) of the battery is less than or equal to 14 DEG C and is more than or equal to 5 DEG C (5 DEG C≤Tmin≤14 DEG C), place
In the closed loop states of 20A；
When the minimum temperature (Tmin) of the battery be more than or equal to 15 DEG C and, the maximum temperature of the battery is less than or equal to 44 DEG C
When (15 DEG C≤Tmin, Tmax≤44 DEG C), the closed loop states in 72A*SOH；
When the maximum temperature (Tmax) of the battery is less than or equal to 48 DEG C and is more than or equal to 45 DEG C (45 DEG C≤Tmax≤48 DEG C),
Closed loop states in 30A；
When the maximum temperature (Tmax) of the battery is more than or equal to 49 DEG C (49 DEG C≤Tmax), the closed loop states in 0A.
7. a kind of power battery fast charge method as claimed in claim 5, it is characterised in that: the temperature charging voltage (V1)
Obtaining value method are as follows:
When the battery temperature is more than or equal to 25 DEG C, 3.540V is taken；
When the battery temperature is less than or equal to 10 DEG C, 3.575V is taken；
When the battery temperature is in 25 DEG C and 10 DEG C, pass through interpolation calculation value.
8. a kind of power battery fast charge method as claimed in claim 7, it is characterised in that: land vertically to execute by electric current and fill as follows
Electricity:
When the cell voltage (V) is less than temperature charging voltage (V1), the closed loop states in 72A*SOH；
When the cell voltage (V) is more than or equal to the temperature charging voltage (V1) and is less than 3.64V, it is reduced to 42A*SOH's
Closed loop states；
When the cell voltage (V) is more than or equal to 3.64V, it is reduced to the closed loop states of 25A*SOH；
Under conditions of keeping the cell voltage (V) to be more than or equal to 3.64V, 17A*SOH is reduced to from the closed loop states of 25A*SOH
Closed loop states；
When the cell voltage (V) is more than or equal to 3.65V, charging terminates.
9. a kind of power battery fast charge method as claimed in claim 8, it is characterised in that: the fast charge execution is documented in VCU
In, and controlled and executed by the VCU.
10. a kind of power battery fast charge method as claimed in claim 9, it is characterised in that: the VCU sends charging current and refers to
It enables and charging voltage is instructed to charging pile, the charging voltage instruction is 400V, and the charging current instruction maximum is no more than
84A。
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| CN109546704B (en) | 2021-08-24 |
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