CN104868562B - A kind of lithium battery group control method for quickly charging - Google Patents
A kind of lithium battery group control method for quickly charging Download PDFInfo
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- CN104868562B CN104868562B CN201510331469.8A CN201510331469A CN104868562B CN 104868562 B CN104868562 B CN 104868562B CN 201510331469 A CN201510331469 A CN 201510331469A CN 104868562 B CN104868562 B CN 104868562B
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Abstract
The invention discloses a kind of lithium battery group control method for quickly charging, this method includes：(1) fast charge mode is started；(2) whether detection each battery cell voltage of lithium battery group is all higher than lowest threshold and less than highest threshold value；(3) if it is, whether the temperature of detection lithium battery group is in the first temperature range；(4) if it is, whether the ceiling voltage of detection battery cell is less than first voltage；(5) if it is, being charged by the first electric current to lithium battery group；(6) in charging process, whether the ceiling voltage in detection battery cell voltage is more than or equal to second voltage and whether lithium battery group total voltage is more than total voltage threshold value；(7) if meeting any one in step (6) condition, reduction charging current to the second electric current in drop electric current charging process, detects the ceiling voltage in battery cell and reaches voltage threshold, charging complete.Using this method, the security of battery pack can be kept in charging process.
Description
Technical field
The invention belongs to the lithium battery system of new-energy automobile charging field, it is related to a kind of lithium battery group quick charge control
Method.
Background technology
Electric automobile has become the new direction of automobile industry technology development, and the energy source of electric automobile is mainly derived from
Battery bag, the energy source of battery bag is main to be realized by outside charging, general, the mode that battery bag charges is divided into soon
Charging, three kinds of modes of charging battery and Brake energy recovery.Different types of battery is used in electric car, what vehicle should be taken fills
Electric strategy is different.
To in the charging scheme of existing electric automobile, only considered the factor of battery electric quantity and monomer voltage, such as according only to
The height of monomer voltage carries out charge control, does not consider the chargeable ability of battery cell under any circumstance, this charging
Control method is a kind of relatively simple method, and charge efficiency is not high, and control it is improper will cause the damage of battery cell,
Up to scrapping for battery bag.
The content of the invention
The invention provides a kind of lithium battery group control method for quickly charging, so that battery pack is located during quick charge
In a kind of efficient, safety state.
To achieve the above object, the invention provides following technical scheme：
A kind of lithium battery group control method for quickly charging, the lithium battery group includes the two or more batteries being connected in series
Monomer, comprises the following steps：
(1) fast charge mode is started；
(2) detect whether each battery cell voltage is all higher than lowest threshold V in the lithium battery groupMAnd less than highest threshold
Value VH；
(3) if it is, detecting the temperature of the lithium battery group whether in the first temperature range；
(4) if it is, detecting whether the ceiling voltage in the lithium battery group in battery cell voltage is less than the first electricity
Pressure value V1；
(5) if it is, passing through the first electric current I1The lithium battery group is charged；
(6) in charging process, detect the ceiling voltage in the lithium battery group in battery cell voltage whether be more than or
Equal to second voltage value V2And whether the lithium battery group total voltage is more than total voltage threshold value VZ, wherein second voltage value V2It is more than
First voltage value V1；
(7) if the ceiling voltage in battery cell voltage is more than or equal to second voltage value V2, or the lithium battery
Group total voltage is more than total voltage threshold value VZ, then charging current is reduced to the second electric current I according to setting step-length2, with the described second electricity
Flow I2During for charging current, detect the ceiling voltage in the lithium battery group in battery cell and reach voltage threshold VT,
Wherein voltage threshold VTMore than second voltage value V2, it is determined that charging complete, stop charging to the lithium battery group, exit quick
Charge mode.
Preferably, methods described also includes：
In step (2), if detecting the minimum voltage of battery cell in the lithium battery group less than or equal to minimum
Threshold value VM, or maximum voltage is more than or equal to highest threshold value VH, it is determined that the battery cell is abnormal, exits quick charge mould
Formula.
Preferably, methods described also includes：
In step (3), if detecting the temperature of the lithium battery group not in the first temperature range, it is determined that described
Lithium battery group temperature anomaly, exits fast charge mode.
Preferably, methods described also includes：
In step (3), if detecting the temperature of the lithium battery group not in the range of second temperature or the lithium
Maximum temperature in battery in battery pack monomer is more than the temperature difference threshold of setting with minimum temperature difference, wherein the second temperature
The minimum value of scope is less than the minimum value of first temperature range, and the maximum of the second temperature scope is more than described first
The maximum of temperature range, it is determined that the lithium battery group temperature anomaly, exits fast charge mode.
Preferably, methods described also includes：
In step (3), temperature detection is carried out to each battery cell in the lithium battery group, if detecting the lithium electricity
The temperature of battery cell is more than or equal to high temperature threshold value T in the group of pondHT, then by less than the first electric current I1The 4th electric current I4To institute
Lithium battery group charging is stated, and the lithium battery group is cooled, until the temperature of the battery cell is critical less than or equal to high temperature
Value THC, return and perform step (4).
Preferably, methods described also includes：
In step (3), temperature detection is carried out to each battery cell in the lithium battery group, if detecting the lithium electricity
The temperature of battery cell is less than or equal to low temperature threshold T in the group of pondLT, then by less than the first electric current I1The 4th electric current I4To institute
Lithium battery group charging is stated, and the lithium battery group is heated up, until the temperature of the battery cell is critical more than or equal to low temperature
Value TLC, return and perform step (4).
Preferably, methods described also includes：
In step (4), if the ceiling voltage detected in the lithium battery group in battery cell voltage is more than or waited
In first voltage value V1, then the 3rd electric current I is passed through3The lithium battery group is charged, wherein the 3rd electric current I3Less than the first electric current
I1, return and perform step (6).
Preferably, methods described also includes：
In step (6), if the ceiling voltage detected in the lithium battery group in battery cell is less than second voltage
Value V2And the lithium battery group total voltage is less than or equal to total voltage threshold value VZ, then return and perform step (2).
Preferably, methods described also includes：
After charging complete, it is 100% to set lithium battery group dump energy percentage SOC.
Preferably, methods described also includes：
In step (7), if detecting charging current more than the second current value I2When, battery list in the lithium battery group
Ceiling voltage in body is voltage threshold VT, it is determined that the lithium battery group charging is abnormal, exits fast charge mode.
The beneficial effects of the present invention are：
The lithium battery group fast charge method that the present invention is provided, physics and chemical characteristic based on lithium ion battery, charging
Early stage, entire car controller is detected to the voltage of each battery cell in lithium battery and each battery cell temperature, excludes battery list
Body is damaged and the abnormal situation of battery cell temperature；In charging process, entire car controller is according to lithium battery monomer
Temperature conditions adjusts charging current in real time, and the battery cell that temperature is too high and temperature is too low is cooled and heating at
Reason, makes battery cell temperature reach in normal range (NR), it is ensured that the security of charging process, if the temperature of lithium battery group is just
In the range of normal temperature, entire car controller carries out large current charge or small electricity according to lithium battery interior charge condition to lithium battery
Current charge；Before charging terminates, by judging the maximum voltage value of battery cell in total voltage value and lithium battery, make charger by
Charging current is reduced to trickle charge state according to setting step-length, is caused for making up battery after fully charged due to self discharge
Capacitance loss, makes battery 100% fully charged, improves the service efficiency of battery.
Brief description of the drawings
A kind of flow chart of Fig. 1 lithium battery group control method for quickly charging of the embodiment of the present invention.
Another flow chart of Fig. 2 lithium battery group control method for quickly charging of the embodiment of the present invention.
Embodiment
In order that those skilled in the art can be further understood that the feature and technology contents of the present invention, below in conjunction with the accompanying drawings
The embodiment of the present invention is elaborated with embodiment.
In lithium battery group actual use, each battery cell in lithium battery group is allowed to be operated in 20%-80% range of capacity
It is interior, higher cycle-index can be reached, and also it is interval in this capacity, battery cell can bear very high charging current
(such as 2C, C are battery capacity), can make the fast quick-recovery battery electric quantity of lithium battery group using the constant-current charge of high current.
Lithium battery is generally possible to charge and discharge 300-500 times, and the aging speed of lithium battery is determined by temperature and charged state
Fixed.Table 1 below illustrates the reduction of battery capacity under two kinds of parameters.
| Temperature | Charging 40% | Charging 100% |
| 0℃ | Capacity 98% after 1 year | Capacity 94% after 1 year |
| 25℃ | Capacity 96% after 1 year | Capacity 80% after 1 year |
| 40℃ | Capacity 85% after 1 year | Capacity 65% after 1 year |
| 60℃ | Capacity 75% after 1 year | Capacity 60% after three months |
Table 1
From table 1, high charge state and increased temperature accelerate the decline of battery capacity.
Only consider the factor of battery electric quantity and monomer voltage for the quick charge at present to electric automobile, the present invention is implemented
Example provides a kind of lithium battery group fast charge method, physics and chemical characteristic of the method based on lithium ion battery, vehicle control
Device processed detection lithium battery group electricity, temperature environment residing for lithium battery group in real time in charging process, for different lithium batteries
Electricity coordinates charger and exports different Constant Electric Current flow valuves, and carries out trickle charge in charging ending, fills lithium battery group 100%
Full electricity.
As shown in figure 1, be a kind of flow chart of lithium battery group control method for quickly charging of the embodiment of the present invention, including it is following
Step：
Step 101, fast charge mode is started.
Step 102, whether each battery cell voltage is all higher than lowest threshold V in detection lithium battery groupMAnd less than highest
Threshold value VH。
If the minimum voltage for detecting battery cell in lithium battery group is less than or equal to lowest threshold VM, or maximum electricity
Pressure is more than or equal to highest threshold value VM, then step 110 is performed；Otherwise, step 103 is performed.
Such as, in lithium battery group each battery cell voltage lowest threshold VMFor 1.6V, and each battery list in lithium battery group
The highest threshold value V of bulk voltageMFor 3.8V, if the voltage of battery cell is not in the range of 1.6V to 3.8V, entire car controller is true
The battery cell for recognizing lithium battery group has been damaged, certainly, above-mentioned lowest threshold VMWith highest threshold value VMOccurrence can be according to current
Depending on lithium battery group.
Step 103, whether the temperature of detection lithium battery group is in the first temperature range.
If detecting the temperature of lithium battery group battery cell not in the first temperature range or in the lithium battery group
In maximum temperature and minimum temperature difference be more than the temperature difference threshold of setting, then perform step 109；Otherwise, step 104 is performed.
Such as, the temperature range of normal working temperature first of lithium battery group is (0 DEG C, 45 DEG C), and the temperature difference threshold set is 5
DEG C, if the temperature of lithium battery group is not in the range of 0 DEG C to 45 DEG C, or the minimum temperature in lithium battery group in battery cell with
Maximum temperature difference is more than 5 DEG C, and entire car controller confirms lithium battery group temperature anomaly, and certainly, above-mentioned first temperature range is with setting
Depending on the occurrence of fixed temperature difference threshold can be according to current lithium battery.
Step 104, whether the ceiling voltage in detection lithium battery group in battery cell voltage is less than first voltage value V1。
If detecting the ceiling voltage in lithium battery group in battery cell voltage is more than or equal to first voltage value V1, then
Step 108 is performed, otherwise, step 105 is performed.
Such as, first voltage value V1For 3.65V, detect the ceiling voltage in lithium battery group in battery cell voltage and be less than
3.65V, confirms that lithium battery group is operated in the range of capacity less than 80%, can to lithium battery group large current charge, certainly, on
State first voltage value occurrence can be according to current lithium battery depending on.
Step 105, the first electric current I is passed through1The lithium battery group is charged.
Specifically, in the case of quick charge, charger receives the instruction of entire car controller transmission, the first electric current is exported
I1Electric current for (1/2) C charges to lithium battery group, wherein, C is lithium battery group capacity, if lithium battery group capacity is
80Ah, then the electric current using the first electric current as (1/2) C is 40Ah to the size of current that lithium battery group charges, certainly, above-mentioned first
Electric current I1Occurrence can be according to current lithium battery depending on.
Step 106, in charging process, the ceiling voltage in detection lithium battery group in battery cell voltage whether be more than or
Equal to second voltage value V2And whether lithium battery group total voltage is more than total voltage threshold value VZ, wherein second voltage value V2More than first
Magnitude of voltage V1。
If detecting the ceiling voltage in lithium battery group in battery cell is less than second voltage value V2And the lithium electricity
Pond group total voltage is less than or equal to total voltage threshold value VZ, then return and perform step 102；Otherwise, step 107 is performed.
Such as, second voltage value V2For 3.68V, and lithium battery group total voltage threshold value VZFor 370V, certainly, above-mentioned second electricity
Pressure value V2With assembled battery total voltage threshold value VZOccurrence can according to current lithium battery group demarcate determine.
Step 107, if the ceiling voltage in battery cell voltage is more than or equal to second voltage value V2, or lithium battery
Group total voltage is more than total voltage threshold value VZ, then charging current is reduced to the second electric current I according to setting step-length2, with the described second electricity
Flow I2During for charging current, detect the ceiling voltage in the lithium battery group in battery cell and reach voltage threshold VT,
Wherein voltage threshold VTMore than second voltage value V2, it is determined that charging complete, stop charging to lithium battery group, perform step 111.
After charging complete, it is 100% that entire car controller, which puts battery pack dump energy percentage SOC,.
If detecting charging current more than the second current value I2When, the ceiling voltage in lithium battery group in battery cell is
Voltage threshold VT, it is determined that the lithium battery group charging is abnormal, performs step 111.
Such as, the second electric current I2For 0.5A, step-length is set as 0.5A, voltage threshold VTFor 3.685V, certainly, above-mentioned second
Electric current I2, setting step-length, the V of voltage thresholdTOccurrence can be demarcated according to current lithium battery group and determined.
Step 108, the 3rd electric current I is passed through3Lithium battery group is charged, wherein the 3rd electric current I3Less than the first electric current I1, return
Perform step 106.
Such as, the 3rd electric current I3For (1/8) C, wherein, C is lithium battery group capacity, if lithium battery group capacity is 80Ah,
Electric current so using the first electric current as (1/8) C is 10Ah to the size of current that lithium battery group charges, certain 3rd electric current I3Tool
Body value can be demarcated according to current lithium battery group and determined.
Step 109, determine that battery pack temperature is abnormal, perform step 111.
Step 110, determine that battery cell is abnormal, perform step 111.
Step 111, fast charge mode is exited.
The lithium battery group control method for quickly charging of the present embodiment, by the highest of battery cell in lithium battery group, most
The detection of low voltage value, determines whether battery cell damages；By the detection to lithium battery group temperature, whether lithium battery group is determined
It is operated within the scope of normal temperature；Pass through the judgement to electric quantity of lithium battery situation, it is determined whether carry out big electricity for lithium battery group
Current charge；By carrying out trickle charge in quick charge ending, it is full of lithium battery 100%.This control method for quickly charging is high
Effect, safety, and improve the service efficiency of lithium battery group.
In another embodiment, entire car controller can adjust charging current according to the temperature of lithium battery, and
Heat management system is opened according to the temperature conditions of lithium battery, by heat management system to the temperature of lithium battery group not in the first temperature
Scope (0 DEG C, 45 DEG C) but the lithium battery group of second temperature scope (- 40 DEG C, 65 DEG C) heated up or cooling processing, make this lithium
In the temperature ascending, descending of battery pack to scope (5 DEG C, 40 DEG C), certainly, above-mentioned first temperature range is specific with second temperature scope
Value can be demarcated according to current lithium battery group and determined.
As shown in Fig. 2 being another flow chart of lithium battery group control method for quickly charging in the embodiment of the present invention, with figure
Unlike flow shown in 1, in the flow chart shown in Fig. 2, the detection to lithium battery cell monomer temperature, vehicle are added
Controller exports different charging currents in different temperatures scope control charger, and to being in the battery list of different temperatures scope
Body is heated up or cooling processing.
Another flow chart of lithium battery group control method for quickly charging shown in Fig. 2, comprises the following steps：
Step 201, fast charge mode is started.
Step 202, whether each battery cell voltage is all higher than lowest threshold V in detection lithium battery groupMAnd less than highest
Threshold value VH。
If the minimum voltage for detecting battery cell in lithium battery group is less than or equal to lowest threshold VM, or maximum electricity
Pressure is more than or equal to highest threshold value VM, then step 216 is performed；Otherwise, step 203 is performed.
Such as, in lithium battery group each battery cell voltage lowest threshold VMFor 1.6V, and each battery list in lithium battery group
The highest threshold value V of bulk voltageMFor 3.8V, if the voltage of battery cell is not in the range of 1.6V to 3.8V, entire car controller is true
The battery cell for recognizing lithium battery group has been damaged, certainly, above-mentioned lowest threshold VMWith highest threshold value VMOccurrence can be according to current
Depending on lithium battery group.
Step 203, whether the temperature of detection lithium battery group is in the range of second temperature.
If detecting the temperature of lithium battery group battery cell not in the range of second temperature or in the lithium battery group
In maximum temperature and minimum temperature difference be more than the temperature difference threshold of setting, then perform step 215；Otherwise, step 204 is performed.
Such as, the normal working temperature second temperature scope of lithium battery group is (- 40 DEG C, 65 DEG C), the temperature difference threshold of setting
For 5 DEG C, if the temperature of lithium battery group is not minimum in battery cell in the range of -40 DEG C to 65 DEG C, or in lithium battery group
Temperature is more than 5 DEG C with maximum temperature difference, and entire car controller confirms lithium battery group temperature anomaly, certainly, above-mentioned second temperature model
Enclose with setting temperature difference threshold occurrence can be according to current lithium battery depending on.
Step 204, temperature detection is carried out to each battery cell in lithium battery group, if detecting battery list in lithium battery group
The temperature of body is more than or equal to high temperature threshold value THT, then step 205 is performed；Otherwise step 207 is performed.
Such as, the high temperature threshold value T of the temperature of battery cellHTFor 45 DEG C, certainly, high temperature critical value THCCan be according to current
Lithium battery group demarcation is determined.
Step 205, by less than the first electric current I1The 4th electric current I4Lithium battery group is charged, and lithium battery group is cooled.
It should be noted that cooling to lithium battery, the air-conditioning that can be specifically arranged in by opening near lithium battery group is swollen
The equipment such as swollen valve, evaporator, fan are realized.
Specifically, the first electric current I1For (1/2) * C, the 4th electric current I4For (1/20) * C, (wherein C is lithium battery group capacity, such as
Fruit C is 80Ah, then the first electric current I1For 40A, and the 4th electric current I4For 4A), certainly, the first electric current I1With the 4th electric current I4Can
Determined with being demarcated according to current lithium battery.
Step 206, in lithium battery temperature-fall period, detecting whether the temperature of lithium battery cell monomer is less than or equal to height
Warm critical value THC, if it is, performing step 210；Otherwise return and perform step 205.
Such as, the high temperature critical value T of the temperature of battery cellHCFor 40 DEG C, certainly, high temperature critical value THCCan according to work as
Preceding lithium battery group demarcation is determined.
Step 207, temperature detection is carried out to each battery cell in the lithium battery group, if detecting the lithium battery group
The temperature of middle battery cell is less than or equal to low temperature threshold TLT, then step 208 is performed；Otherwise step 210 is performed.
Specifically, in lithium battery group the temperature of battery cell low temperature threshold TLTFor 0 DEG C, certain low temperature threshold TLTCan be with
Demarcated and determined according to current lithium battery group.
Step 208, by less than the first electric current I1The 4th electric current I4Lithium battery group is charged, and lithium battery group is heated up.
It should be noted that being heated up to lithium battery group, it can specifically be added by opening the PTC being arranged near lithium battery group
Thermal is realized.
Specifically, the first electric current I1For (1/2) * C, the 4th electric current I4For (1/20) * C, (wherein C is lithium battery group capacity, such as
Fruit C is 80Ah, then the first electric current I1For 40A, and the 4th electric current I4For 4A), certainly, the first electric current I1With the 4th electric current I4Can
Determined with being demarcated according to current lithium battery.
Step 209, in lithium battery group temperature-rise period, whether the temperature of detection lithium battery cell monomer is more than or equal to
Low temperature critical value TLC, if it is, performing step 210；Otherwise return and perform step 208.
Specifically, the low temperature critical value T of the temperature of battery cellLCFor 5 DEG C, certainly, low temperature critical value TLCCan according to work as
Preceding lithium battery group demarcation is determined.
Step 210, whether the ceiling voltage in detection lithium battery group in battery cell voltage is less than first voltage value V1。
If detecting the ceiling voltage in lithium battery group in battery cell voltage is more than or equal to first voltage value V1, then
Step 211 is performed, otherwise, step 214 is performed.
Such as, first voltage value V1For 3.65V, detect the ceiling voltage in lithium battery group in battery cell voltage and be less than
3.65V, confirms that lithium battery group is operated in the range of capacity less than 80%, can to lithium battery group large current charge, certainly, on
State first voltage value occurrence can be according to current lithium battery depending on.
Step 211, the first electric current I is passed through1The lithium battery group is charged.
Specifically, the first electric current I1For (1/2) * C (wherein C is lithium battery group capacity) certainly, the first electric current I1Can basis
Current lithium battery group demarcation is determined.
Step 212, in charging process, the ceiling voltage in detection lithium battery group in battery cell voltage whether be more than or
Equal to second voltage value V2And whether lithium battery group total voltage is more than total voltage threshold value VZ, wherein second voltage value V2More than first
Magnitude of voltage V1。
If detecting the ceiling voltage in lithium battery group in battery cell is less than second voltage value V2And the lithium electricity
Pond group total voltage is less than or equal to total voltage threshold value VZ, then return and perform step 202；Otherwise, step 213 is performed.
Such as, second voltage value V2For 3.68V, and lithium battery group total voltage threshold value VZFor 370V, certainly, above-mentioned second electricity
Pressure value V2With assembled battery total voltage threshold value VZOccurrence can according to current lithium battery group demarcate determine.
Step 213, if the ceiling voltage in battery cell voltage is more than or equal to second voltage value V2, or lithium battery
Group total voltage is more than total voltage threshold value VZ, then charging current is reduced to the second electric current I according to setting step-length2, with the described second electricity
Flow I2During for charging current, detect the ceiling voltage in the lithium battery group in battery cell and reach voltage threshold VT,
Wherein voltage threshold VTMore than second voltage value V2, it is determined that charging complete, stop charging to lithium battery group, perform step 217.
After charging complete, it is 100% that entire car controller, which puts battery pack dump energy percentage SOC,.
If detecting charging current more than the second current value I2When, the ceiling voltage in lithium battery group in battery cell is
Voltage threshold VT, it is determined that the lithium battery group charging is abnormal, performs step 217.
Such as, the second electric current I2For 0.5A, step-length is set as 0.5A, voltage threshold VTFor 3.685V, certainly, above-mentioned second
Electric current I2, setting step-length, the V of voltage thresholdTOccurrence can be demarcated according to current lithium battery group and determined.
Step 214, the 3rd electric current I is passed through3Lithium battery group is charged, wherein the 3rd electric current I3Less than the first electric current I1, return
Perform step 212.
Specifically, the 3rd electric current I3For (1/8) C, wherein, C is lithium battery group capacity, if lithium battery group capacity is
80Ah, then the electric current using the first electric current as (1/8) C is 10Ah to the size of current that lithium battery group charges, certain 3rd electric current
I3Occurrence can according to current lithium battery group demarcate determine.
Step 215, determine that battery pack temperature is abnormal, perform step 217.
Step 216, determine that battery cell is abnormal, perform step 217.
Step 217, fast charge mode is exited.
The lithium battery group control method for quickly charging of the present embodiment, detects lithium battery cell monomer temperature, different
Temperature range is charged by different electric currents to lithium battery group, and is judged whether out according to the temperature of lithium battery cell monomer
Heat management system is opened, lithium battery group is heated up or cooled.This method is in lithium battery group temperature drift and relatively low situation
Under export the charging current for charging of low current value, and after the temperature control of lithium battery is in safe temperature range, output
The charging current of high current, the method improves the security and high efficiency of charging process.
The embodiment of the present invention is described in detail above, embodiment used herein is carried out to the present invention
Illustrate, the explanation of above example is only intended to help to understand system and method for the invention；Simultaneously for the one of this area
As technical staff, according to the present invention thought, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of lithium battery group control method for quickly charging, the lithium battery group includes the two or more battery lists being connected in series
Body, comprises the following steps：
(1) fast charge mode is started；
(2) detect whether each battery cell voltage is all higher than lowest threshold V in the lithium battery groupMAnd less than highest threshold value VH；
(3) if it is, detecting the temperature of the lithium battery group whether in the first temperature range；
(4) if it is, detecting whether the ceiling voltage in the lithium battery group in battery cell voltage is less than first voltage value
V1；
(5) if it is, passing through the first electric current I1The lithium battery group is charged；
(6) in charging process, detect whether the ceiling voltage in the lithium battery group in battery cell voltage is more than or equal to
Second voltage value V2And whether the lithium battery group total voltage is more than total voltage threshold value VZ, wherein second voltage value V2More than first
Magnitude of voltage V1；
(7) if the ceiling voltage in battery cell voltage is more than or equal to second voltage value V2, or the lithium battery group is always electric
Pressure is more than total voltage threshold value VZ, then charging current is reduced to the second electric current I according to setting step-length2, with the second electric current I2For
During charging current, detect the ceiling voltage in the lithium battery group in battery cell and reach voltage threshold VT, wherein
Voltage threshold VTMore than second voltage value V2, it is determined that charging complete, stop charging to the lithium battery group, exit quick charge
Pattern.
2. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes:
In step (2), if the minimum voltage for detecting battery cell in the lithium battery group is less than or equal to lowest threshold
VM, or maximum voltage is more than or equal to highest threshold value VH, it is determined that the battery cell is abnormal, exits fast charge mode.
3. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes：
In step (3), if detecting the temperature of the lithium battery group not in the first temperature range, it is determined that the lithium electricity
Pond group temperature anomaly, exits fast charge mode.
4. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes：
In step (3), if detecting the temperature of the lithium battery group not in the range of second temperature or the lithium battery
Maximum temperature in group in battery cell is more than the temperature difference threshold of setting with minimum temperature difference, wherein the second temperature scope
Minimum value be less than the minimum value of first temperature range, the maximum of the second temperature scope is more than first temperature
The maximum of scope, it is determined that the lithium battery group temperature anomaly, exits fast charge mode.
5. the lithium battery group control method for quickly charging according to claim 1 or 3, it is characterised in that methods described is also wrapped
Include：
In step (3), temperature detection is carried out to each battery cell in the lithium battery group, if detecting the lithium battery group
The temperature of middle battery cell is more than or equal to high temperature threshold value THT, then by less than the first electric current I1The 4th electric current I4To the lithium
Battery pack is charged, and the lithium battery group is cooled, until the temperature of the battery cell is less than or equal to high temperature critical value THC,
Return and perform step (4).
6. the lithium battery group control method for quickly charging according to claim 1 or 3, it is characterised in that methods described is also wrapped
Include：
In step (3), temperature detection is carried out to each battery cell in the lithium battery group, if detecting the lithium battery group
The temperature of middle battery cell is less than or equal to low temperature threshold TLT, then by less than the first electric current I1The 4th electric current I4To the lithium
Battery pack is charged, and the lithium battery group is heated up, until the temperature of the battery cell is more than or equal to low temperature critical value TLC,
Return and perform step (4).
7. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes:
In step (4), if detecting ceiling voltage in the lithium battery group in battery cell voltage is more than or equal to the
One magnitude of voltage V1, then the 3rd electric current I is passed through3The lithium battery group is charged, wherein the 3rd electric current I3Less than the first electric current I1, return
Receipt row step (6).
8. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes：
In step (6), if the ceiling voltage detected in the lithium battery group in battery cell is less than second voltage value V2And
And the lithium battery group total voltage is less than or equal to total voltage threshold value VZ, then return and perform step (2).
9. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes：
After charging complete, it is 100% to set lithium battery group dump energy percentage SOC.
10. lithium battery group control method for quickly charging according to claim 1, it is characterised in that methods described also includes：
In step (7), if detecting charging current more than the second current value I2When, in the lithium battery group in battery cell
Ceiling voltage be voltage threshold VT, it is determined that the lithium battery group charging is abnormal, exits fast charge mode.
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