CN103023111A - Method and system for balancing battery pack - Google Patents
Method and system for balancing battery pack Download PDFInfo
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- CN103023111A CN103023111A CN2012105451785A CN201210545178A CN103023111A CN 103023111 A CN103023111 A CN 103023111A CN 2012105451785 A CN2012105451785 A CN 2012105451785A CN 201210545178 A CN201210545178 A CN 201210545178A CN 103023111 A CN103023111 A CN 103023111A
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Abstract
The invention discloses a method and a system for balancing a battery pack. The method includes determining a balancing way which is selected according to consistency of batteries of the battery pack, determining that the battery pack does not work, and utilizing the determined balancing way to balance the battery pack. The method and the system for balancing the battery pack select the balancing way according to the characteristics of the batteries, so that better balance can be made between system cost reducing and energy saving; and balance management among battery monomers of the battery pack can be achieved under the condition that usage of users is not influenced.
Description
Technical field
The present invention relates to the battery technology field, relate in particular to a kind of method and system for the balancing battery group.
Background technology
In today that environment, energy problem become increasingly conspicuous, electric energy is more and more favored with the characteristics of its green, environmental protection.Battery that can store electrical energy has begun to be applied to the fields such as electrician's instrument, electric automobile.Although this New-energy electric vehicle can solve the problem of energy crisis and environmental protection crisis, development bottleneck---battery is arranged also.Be applied to the power battery pack of electric automobile, owing to making and the otherness of use procedure, can cause inconsistent between the battery cell.In the time of batteries charging, the monomer that state-of-charge (SOC) the is high charge cutoff voltage that can take the lead in reaching, thus reduce the electric weight that battery pack can be filled with; And in discharge process, the monomer that SOC is low can reach first discharge cut-off voltage, thereby reduces the electric weight that battery pack can be emitted.Along with the battery pack increase of service time, the inconsistency of battery cell can further enlarge, thereby the overall performance of battery pack is further descended.Therefore must carry out balanced management to the battery pack that has inconsistency.
The balanced way that extensively adopts in the current driving force battery pack has dual mode basically, i.e. equalization discharge mode and active equalization mode.
Wherein, the equalization discharge mode realizes that simply cost is low, but discharging current is little and equalization discharge carries out in charging process, causes the charging interval long.If have in the prior art a kind of battery pack balancing method for the voltage difference between all monomer battery voltages of battery pack battery minimum greater than equalizing voltage value and this battery and voltage greater than balanced upper limit pressure difference, size according to charging current arranges the corresponding euqalizing current of this battery so, and the conducting of battery management chip control respective switch pipe is carried out equalization discharge to this battery.In the method, discharging current is larger, and the heat radiation of equalizing circuit becomes a problem.Long for the equalization discharge time and dispel the heat problem, other equalization discharge methods are also arranged in the prior art, it adopts fan, super capacitor or other energy storage and energy conversion device to replace power resistor or the method that is connected in parallel on the power resistor two ends increases euqalizing current and improves heat radiation, although the method designs ingenious, can greatly increase the volume of equalizing system.
Active equalization mode energy savings, service time of battery can be increased and equilibrium is quicker, but cost is higher, realizes relatively difficulty.A kind of active equalization device is arranged in the prior art, and each battery cell of battery pack has been equipped with the DC-DC power supply in this device, although can carry out equilibrium to high capacity lithium ion battery rapidly, cost is very high, and the balancer volume is very huge.Another kind of active equalization device is also arranged in the prior art, this the device in by polarity switch group and battery selector switch group, make an isolated converter carry out balanced management to a plurality of batteries, discharge and recharge number of devices and complexity in circuits thereby reduced, but because one discharges and recharges the same time of device and can only carry out equalization operation in a plurality of batteries, thereby the balanced time is longer.Also has a kind of balancer in the prior art, in this device, adopt energy storage inductor to realize the transfer of energy in the battery pack, but this device can only carry out energy to adjacent battery cell to be shifted, if the battery cell of two needs equilibriums is when distant, the balanced time can become long, simultaneously inductance is carried out charging and discharging and all can have energy loss, energy loss can be larger when treating that balanced battery cell distance is far.
In a word, active equalization and equalization discharge have its shortcoming separately.
Summary of the invention
Introduced the concept of a series of reduced forms in the summary of the invention part, this will further describe in the embodiment part.Summary of the invention part of the present invention does not also mean that key feature and the essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection range of attempting to determine technical scheme required for protection.
In order to address the above problem, the invention provides a kind of method for the balancing battery group, comprising: determine according to the selected balanced way of the battery consistency of battery pack; Determine that described battery pack do not work; And utilize the balanced described battery pack of determined balanced way.
In a preferred embodiment of the invention, determine that described described battery pack also comprises before not working: the equilibrium state of determining described battery pack.
In a preferred embodiment of the invention, the equilibrium state of described definite described battery pack comprises: the voltage of determining the battery cell of described battery pack reaches stable; And the magnitude relationship of the voltage pressure reduction between the described battery cell of definite described battery pack and set point is to determine the equilibrium state of described battery pack.
In a preferred embodiment of the invention, the method that is used for the balancing battery group also comprises and is controlled at the charging process of described battery pack being carried out before the described equilibrium state of determining described battery pack.
In a preferred embodiment of the invention, described charging process comprises: in the situation that guarantee will be increased to the maximum charging current that allows from zero to the charging current of described batteries charging safely, keeps described maximum permission charging current to reach set point until one of battery cell of described battery pack reaches the total voltage of charge cutoff voltage or described battery pack; And progressively reduce described charging current to described batteries charging until it reaches the minimum charge current of setting.
In a preferred embodiment of the invention, also comprise before described charging process: the controlled circulation cooling system is opened; And after the equilibrium state of described definite described battery pack, also comprise: control described circulating cooling system and close.
In a preferred embodiment of the invention, describedly determine that the equilibrium state of described battery pack also comprises: utilize described circulating cooling system to make the temperature difference between the battery cell of described battery pack less than preset value; Wherein, described preset value is determined by the battery temperature test.
In a preferred embodiment of the invention, after described definite battery pack is worked and before the described battery pack of described equilibrium, also do not comprise: balanced start-up course, it comprises: the voltage of determining the battery cell of described battery pack reaches stable; And determine that the voltage of described battery cell of described battery pack and temperature are within setting range separately.
In a preferred embodiment of the invention, described balanced start-up course also comprises: determine that the temperature difference between the described battery cell of described battery pack is less than preset value; Wherein, described preset value is determined by the battery temperature test.
In a preferred embodiment of the invention, described balanced way comprises equalization discharge mode and active equalization mode; Wherein, described equalization discharge mode is selected when the parameter of the described battery consistency of expression is less than or equal to threshold value, and described active equalization mode is selected when the parameter of the described battery consistency of described expression is higher than described threshold value.
In a preferred embodiment of the invention, described battery consistency is determined by the battery cycle life test.
Preferably, in described battery cycle life test, test the quantity that used number of batteries equals the battery cell in the described battery pack.
Alternatively, in the test of described battery cycle life, test used number of batteries and be less than the quantity of the described battery cell in the described battery pack but be no less than 10.
According to a further aspect of the invention, also provide a kind of system for the balancing battery group, comprising: the battery pack balancing mode is determined device, and it is configured to for determining according to the selected balanced way of the battery consistency of battery pack; Battery pack definite device of not working, it is configured to not work for definite described battery pack; And battery pack balancing device, it is configured to be used to utilizing the balanced described battery pack of determined balanced way.
In a preferred embodiment of the invention, described system also comprises: the battery pack balancing state is determined device, and it is configured to for the equilibrium state of determining described battery pack before not working in described definite described battery pack.
In a preferred embodiment of the invention, described system also comprises: the batteries charging control device, it is configured to the charging process of described battery pack being carried out before the described equilibrium state of determining described battery pack be used to being controlled at.
In a preferred embodiment of the invention, described batteries charging control device also is configured to open for controlled circulation cooling system before described charging process, and the described circulating cooling system of control is closed after the equilibrium state of described definite described battery pack.
In a preferred embodiment of the invention, described system also comprises: balanced starting drive, its be configured to voltage for the battery cell of determining described battery pack reach stable and determine the voltage of described battery cell of described battery pack and temperature within setting range separately.
In a preferred embodiment of the invention, described balanced starting drive also is configured to for the temperature difference between the described battery cell of determining described battery pack less than preset value; Wherein, described preset value is determined by the battery temperature test.
In a preferred embodiment of the invention, described balanced way comprises equalization discharge mode and active equalization mode; Wherein, described equalization discharge mode is selected when the parameter of the described battery consistency of expression is less than or equal to threshold value, and described active equalization mode is selected when the parameter of the described battery consistency of described expression is higher than described threshold value.
In a preferred embodiment of the invention, described battery consistency is determined by the battery cycle life test.
Method and system for the balancing battery group provided by the present invention is selected balanced way according to the battery self-characteristic, thereby can make better balance between system cost and energy savings; And can be in the situation that do not affect balanced management between the battery cell that the user use to realize battery pack.
Description of drawings
Following accompanying drawing of the present invention is used for understanding the present invention at this as a part of the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 shows the flow chart of the method that is used for the balancing battery group according to a preferred embodiment of the invention;
Fig. 2 shows the flow chart of the equilibrium state of definite battery pack according to a preferred embodiment of the invention;
Fig. 3 shows the flow chart to the process of batteries charging according to a preferred embodiment of the invention;
Fig. 4 shows the flow chart of the balanced start-up course of the battery pack that is used for electric automobile according to a preferred embodiment of the invention;
Fig. 5 shows the flow chart of the equalization discharge of battery pack according to a preferred embodiment of the invention;
Fig. 6 shows the flow chart of the active equalization of battery pack according to a preferred embodiment of the invention; And
Fig. 7 shows the block diagram of the system that is used for the balancing battery group according to a preferred embodiment of the invention.
Embodiment
In the following description, a large amount of concrete details have been provided in order to more thorough understanding of the invention is provided.Yet, it will be apparent to one skilled in the art that the present invention can need not one or more these details and implemented.In other example, for fear of obscuring with the present invention, be not described for technical characterictics more well known in the art.
In order thoroughly to understand the present invention, detailed structure will be proposed in following description.Obviously, execution of the present invention is not limited to specific details appreciated by those skilled in the art.Preferred embodiment of the present invention is described in detail as follows, yet except these were described in detail, the present invention can also have other execution modes.
On the one hand, the invention provides a kind of method for the balancing battery group.Fig. 1 shows the flow chart of the method 100 that is used for the balancing battery group in accordance with a preferred embodiment of the present invention.As shown in Figure 1, the method comprises battery pack balancing mode determining step 101, battery pack do not work determining step 104 and battery pack balancing step 106.Thereby the method 100 can select suitable balanced way to make better balance between system cost and energy savings in conjunction with the battery pack own characteristic.The below describes each step in the method in detail.
Battery pack balancing mode determining step 101 determines according to the selected balanced way of the battery consistency of battery pack, with as the employed balanced way of battery pack balancing step 106.
According to a preferred embodiment of the present invention, the battery consistency of battery pack can be determined by the battery cycle life test.The parameter of expression battery consistency can be the SOC difference between the battery cell of battery pack.
In the battery cycle life test, test battery cell and the actual same batch same specification of battery cell that uses in the battery pack in the used battery pack.Preferably, test the quantity that used number of batteries can equal the battery cell in the actual use battery pack, perhaps be less than the quantity of the battery cell in the actual use battery pack but be no less than 10.Like this, reality uses the battery consistency of battery pack to test out comparatively exactly.For example, the battery cell number of actual use battery pack is 96, and the battery cell number that the battery cycle life of battery pack is tested in the used battery pack is 17.The battery cycle life method of testing of battery pack comprises: reach charge cutoff voltage with the 1C constant current charge to high monomer voltage to testing used battery pack under the normal temperature, left standstill one hour, reach discharge cut-off voltage with the 1C constant-current discharge to minimum monomer voltage again, leave standstill after one hour and continue charging and discharging.Wherein nC refer to charging current be the battery rated capacity n doubly, be full of electricity in namely 1/n hour.Once charging is a circulation with once discharging.The capacity loss that the test of the battery cycle life of battery pack is performed until the used battery pack of test to its initial capacity below 60% or cycle-index reach 1000 times.Per 50 circulations are all once measured the capacity of testing each monomer in the used battery pack and the SOC of each monomer.
Preferably, if the battery cell number that battery pack cycle life is tested in the used battery pack equates with the actual battery cell number of battery pack that uses, if then circulate after 20 times, test between the battery cell in the used battery pack SOC difference and think then that less than 5% the battery consistency of actual use battery pack is better; SOC difference between the battery cell if circulate in the used battery pack of 10 build-in tests thinks then that greater than 5% the battery consistency of actual use battery pack is relatively poor.If the used battery cell number of battery pack cycle life test is half of battery cell number of actual use battery pack, if then circulate after 40 times, test between the battery cell in the used battery pack SOC difference and think then that less than 5% the battery consistency of actual use battery pack is better; If circulate in 20 times, test SOC difference between the battery cell in the used battery pack just greater than 5%, think that then the battery consistency that is actually used the pond group is relatively poor.The rest may be inferred for the battery of other quantity.
According to a preferred embodiment of the present invention, balanced way can comprise equalization discharge mode and active equalization mode.Wherein, the equalization discharge mode is selected when being less than or equal to threshold value in the parameter (being the difference of SOC between the battery cell in the battery pack) of expression battery consistency, and the active equalization mode is selected when the parameter of expression battery consistency is higher than threshold value.Whether preferably, this threshold value can be 5%, better to distinguish battery consistency.Equalization discharge is determined the target voltage of equalization discharge and the battery cell of needs equilibrium according to the battery cell voltage data of battery pack, then the battery cell of needs equilibrium is discharged until all need all discharge offs of balanced battery cell.Active equalization then is battery cell and the corresponding charging interval of determining the needs active equalization according to the battery cell voltage data of battery pack, then the battery cell of needs equilibrium is charged until all need balanced battery cell all to charge complete.One of ordinary skill in the art will appreciate that, except above-mentioned balanced way, the present invention can also adopt other balanced ways.
For consistency battery pack preferably, because need balanced number of times seldom to there is no need the active equalization mode of selecting cost higher in actual the use, and often carry out the relatively poor battery pack of consistency of equalization operation for needs, then be necessary to adopt the active equalization mode to come conserve energy and increase service time of battery.Thus, successfully avoided the wasting of resources.
Battery pack not job step 104 definite battery pack is not worked.Determine battery pack do not work after again on battery pack carry out equilibrium can in the situation of the normal use that does not affect battery pack, realize the equilibrium.For example, if battery pack is used for electric automobile, (when battery pack is stopped using) startup can not affect the normal use of electric automobile like this to the equilibrium of battery pack in the time of can work as then that receiving stops and put out spoon signal.
Battery pack balancing step 106 is utilized determined balanced way balancing battery group, for example, battery pack is carried out equalization discharge or active equalization.
According to a preferred embodiment of the present invention, the method 100 that is used for the balancing battery group can also comprise battery pack balancing state determining step 103, and it determined the equilibrium state of battery pack before battery pack is not worked determining step 104.Equilibrium state can comprise equilibrium, unbalanced or half balanced, and it represents respectively between the battery cell of current battery pack is balanced, unbalanced or half balanced.The half balanced meaning is that balancing procedure has interrupted when not yet finishing for some reason.If the equilibrium state of battery pack is balanced, then need not to carry out equilibrium.Therefore, the equilibrium state of determining in advance battery pack can be avoided the wasting of resources effectively.
According to a preferred embodiment of the present invention, the equilibrium state of determining battery pack can comprise: the voltage of determining the battery cell of battery pack reaches stable; And the magnitude relationship of the voltage pressure reduction between the battery cell of definite battery pack and set point is to determine the equilibrium state of battery pack.One of ordinary skill in the art will appreciate that, voltage pressure reduction and SOC difference have corresponding relation.For example, if the SOC difference of battery cell surpasses 5%, determine that then battery pack is unbalanced.The flow process of determining the equilibrium state of battery pack will describe in detail in Fig. 2.
According to a preferred embodiment of the present invention, the method 100 for the balancing battery group can also comprise batteries charging control step 102.In the preferred embodiment, determine that the battery pack balancing state should carry out after battery pack is charged, so that the charging process of battery pack and balancing procedure are independent, namely no longer as conventional art, in charging process, carry out equilibrium, do like this and can relatively shorten the charging interval, reach the effect of quick charge, improve the service efficiency of battery pack.
According to a preferred embodiment of the present invention, the batteries charging process may further include: in the situation that guarantee will be increased to the maximum charging current that allows from zero to the charging current of batteries charging safely, keep the maximum charging current that allows to reach set point until one of battery cell of battery pack reaches the total voltage of charge cutoff voltage or battery pack; And progressively reduce charging current to batteries charging until it reaches the minimum charge current of setting.With the method battery pack is charged and to improve charge rate.Flow process to batteries charging will describe in detail in Fig. 3.
According to a preferred embodiment of the present invention, comprise also that before the charging process of battery pack the controlled circulation cooling system opens; Comprise also that after the equilibrium state of determining battery pack controlling this circulating cooling system closes.
According to a preferred embodiment of the present invention, the equilibrium state of determining battery pack also comprises: utilize circulating cooling system to make the temperature difference between the battery cell of battery pack less than preset value; Wherein, described preset value is determined by the battery temperature test.
Existing method battery pack is charged and balanced in do not consider the impact of temperature.In the actual use procedure, might there be temperature contrast larger between the battery cell owing to the difference of battery operated situation and heat radiation situation, temperature contrast can cause the difference of battery capacity, thereby cause the difference of voltage between the close monomer of SOC, these factors all should take into account to realize preferably the equilibrium of charging and battery in charging and equilibrium.
To open the temperature that can guarantee whole charging process battery pack minimum in the temperature difference within the allowed band and between the battery cell for the controlled circulation cooling system before battery pack is charged, thereby avoid the battery cell that brings because the temperature difference causes greatly the difference of battery charge efficiency unbalanced.In addition, after determining the battery pack balancing state again the controlled circulation cooling system close can be so that determine that the temperature difference is less between the battery cell monomer in the process of equilibrium state of battery pack, thereby avoid the impact of Yin Wendu and cause the inconsistency misjudgment between the battery cell, namely do not affect the judgement to the equilibrium state of battery pack.The temperature difference here can have a preset value, and this preset value can be determined by the battery temperature test.
The battery temperature test can be tested according to the battery cycle life of above-mentioned battery pack the battery consistency situation of determined battery pack, select the battery cell of the used some of test, test these selected battery cells in state-of-charge-open circuit voltage (SOC-OCV) relation curve of certain temperature range and the relation of capacity, internal resistance and temperature.Alternatively, if battery consistency is better, then select 2 ~ 3 used battery cells of test to test; If the consistency of battery is relatively poor, then select the used battery cell of test more than 5 to test.Final result gets the measurement mean value of these monomers.Range of measuring temp when alternatively, battery temperature is tested is-20 ~ 60 degrees centigrade.Preferably, battery temperature test interts with above-mentioned battery pack cycle life test to be carried out: namely begin to adopt the part battery cell in the used battery pack of battery pack cycle life test to carry out the battery temperature test before the test of battery pack cycle life, then battery pack cycle life is tested every circulation and is carried out the primary cell temperature test 50 times again.Alternatively, the battery temperature test was only carried out once before the test of battery pack cycle life.The temperature relation curve that the battery parameter of different temperatures can be by the battery temperature test in the different battery life situations and the data of battery pack cycle life test be carried out interpolation and be obtained.By the battery temperature test, can obtain the situation of the various parameter temperature influences of battery pack, reach better portfolio effect thereby in the follow-up equalization operation process of battery pack, corresponding temperature range is set.
Wherein, concrete SOC-OCV method of testing can be for after being full of the battery cell of battery pack with standard method, (such as C/30) discharges into discharge cut-off voltage with trickle, leave standstill enough time again with trickle charge to charge cutoff voltage, discharge curve and charging curve on average as the SOC-OCV curve.The method of testing of another kind of SOC-OCV is for after being full of battery cell with standard method, with certain constant-current pulse battery cell is discharged, each pulse bleeds off 5% of battery capacity, leave standstill enough time after each pulse and reach stable fully by battery cell voltage, thereby obtain the SOC-OCV curve of the discharge process under certain discharging current.Can obtain similarly the SOC-OCV curve of the different electric currents of SOC-OCV curve under other discharging currents and charging process, comprehensively these curves obtain a representative battery SOC-OCV curve.
In addition, test the isoparametric multi-dimensional database of temperature, voltage, capacity, life-span, SOC that the data that obtain can be set up the battery in battery pack monomer in conjunction with battery temperature test and above-mentioned battery pack cycle life.According to the data such as temperature, voltage and life-span of battery cell, from database, can directly obtain the corresponding SOC of each battery cell, to use when definite battery pack balancing state.
According to a preferred embodiment of the present invention, the method 100 that is used for the balancing battery group can also comprise balanced setting up procedure 105, and it carries out balanced start-up course after battery pack is not worked determining step 104 and before battery pack balancing step 106.This process comprises: the voltage of determining the battery cell of battery pack reaches stable; And the voltage of the battery cell of definite battery pack and temperature are within setting range separately.After definite battery pack is not worked, do not carry out at once equalization operation, start but carry out first equilibrium, like this, can equilibrium start during this period of time in judge whether all situations all meet the optimum condition that begins equalization operation.
According to a preferred embodiment of the present invention, balanced start-up course comprises that also the temperature difference between the battery cell of determining battery pack is less than preset value.Wherein, preset value is determined by the battery temperature test.Determine between the battery cell of battery pack the temperature difference in allowed limits, can avoid like this temperature on the impact of follow-up equalization operation.Battery temperature test front is described in detail, repeats no more herein.The flow process of balanced start-up course will describe in detail in Fig. 4.
Fig. 2 shows the flow chart of the equilibrium state of definite battery pack according to a preferred embodiment of the invention.Battery pack balancing state determining step 103 shown in Fig. 1 can comprise that step 202 as shown in Figure 2 is to 206.Be in imbalance if determine battery pack, process ends then, otherwise proceed.Within a certain period of time, if the temperature difference between the battery cell of battery pack is less than preset value, the voltage of the battery cell in the battery pack reaches stable, determine then whether the battery cell ceiling voltage of battery pack and the difference of battery cell minimum voltage surpass set point, if do not surpass, determine that then this battery pack is balanced; If surpass, just determine that this battery pack is unbalanced, can put and unbalancedly be masked as 1.Wherein, unbalanced sign can be made as three, is respectively 0,1 and 2.Wherein, the current battery pack balancing of 0 expression, the current battery pack of 1 expression is unbalanced, and the unbalanced and balancing procedure of the 2 current battery pack of expression is in interrupt status.
As shown in Figure 2, at first in step 201, judge whether unbalanced sign is 0, if unbalancedly be masked as 0, namely current battery pack is balanced, then proceeds following step and determines whether really at equilibrium.If unbalanced sign is not 1 or 2 for 0(), namely current battery pack determines it is unbalanced or half equilibrium, then need not to carry out determining of equilibrium state again, and the equilibrium state that directly changes step 209 over to is determined to finish, and namely unbalanced sign does not change.
In step 202, time-delay t1 also records voltage data and the temperature data of each battery cell in the battery pack.In a preferred embodiment of the invention, delay time is 10 seconds, i.e. t1=10 second.Record voltage data and the temperature data of all battery cells in 10 seconds with 100 milliseconds intervals.Preferably, the battery cell quantity of battery pack is 96, and it is 16 points that temperature is counted.
In step 203, judge that whether the temperature difference between the battery in battery pack monomer is less than T1.Wherein, the decision method of the temperature difference between the battery cell in the battery pack is: adopt 10 seconds mean temperatures of 16 points of record in the step 202 to compare, calculate the difference △ T of maximum temperature and minimum temperature, if △ T greater than T1, then enters step 205.If △ T less than T1, then proceeds step 204.Wherein, the setting of T1 need to be considered in front described battery temperature test data.Preferably, if minimum temperature greater than 10 degrees centigrade, T1=10 then, if minimum temperature is lower than 10 degrees centigrade, T1=5 then.
In step 204, determine whether the voltage of battery cell reaches stable.If reach stable, then proceed step 206, and if do not reach stable, then enter step 205.Wherein, whether the voltage of battery cell reaches stable decision method: the voltage data that adopts the battery cell of record in the step 202, the relatively average voltage of all battery cell t1 second and the 1st second average voltage, if the difference of voltage, thinks then that cell voltage reaches stable less than set point.The dynamic characteristic of battery itself is depended in the formulation of this set point.Preferably, this set point adopts 2 millivolts.
In step 205, whether the time of judging surpasses t2, if surpass, then isostatic anomaly changes step 208 isostatic anomaly over to and processes.If do not surpass, then get back to step 202.Wherein, the setting of t2 need to be considered the dynamic characteristic of the battery cell of used battery pack.Preferably, t2=60 second.
In step 206, judge whether the voltage pressure reduction between the battery cell of battery pack surpasses set point.If surpass, then enter step 207, and if do not surpass, then change step 209 over to.Wherein, the set point of the voltage pressure reduction between the battery cell of battery pack is relevant with cycle life and the temperature of battery pack.In a preferred embodiment of the invention, if the SOC difference between the battery in battery pack monomer surpasses 5%, think that then this battery pack need to carry out equalization operation.Especially, in a preferred embodiment of the invention, temperature range be 20 ~ 30 degrees centigrade and battery pack life-span near 100% in, the voltage pressure reduction permissible value between the battery cell of battery pack is set as 85 millivolts.
In step 207, put and unbalancedly be masked as 1, and the voltage data of all battery cells in the record battery pack.In a preferred embodiment of the invention, if judge that battery pack is unbalanced, then record in this step the monomer voltage of all battery cells in the battery pack, and calculate the difference of SOC and the SOC of all battery cells, unbalanced counter adds 1, and record the current time, the counting that surpasses 1 month in the unbalanced counter is deducted.Counting in the unbalanced counter is a nearest unbalanced number of times that the middle of the month, battery pack accumulative total occurred, this numerical value is used for the autodiagnosis to battery pack, if numerical value is larger, then thinks part battery capacity existing problems in the battery pack, thereby can reminding user be changed by battery.The method of determining battery cell SOC according to temperature, voltage and the life-span of battery in battery pack monomer is: then the multi-dimensional database of the temperature of utilizing the test of foregoing battery pack cycle life and battery temperature to test to set up the battery in battery pack monomer, voltage, capacity, life-span, SOC obtains the SOC of current each monomer from multi-dimensional database according to data such as the temperature of current battery, voltage, life-spans.
Step 208 is carried out the isostatic anomaly processing, and this processes unusual concrete condition in record equilibrium state deterministic process, if continuous 3 times occur unusually can sending warning signal.
Step 209 equilibrium state is determined to finish.
Fig. 3 shows the flow chart of the charging process of battery pack according to a preferred embodiment of the invention.This charging process of charging control step 102 control of battery pack shown in Fig. 1.During charging, in the normal situation of charging, begin to increase charging current by zero, be increased to charging current always and reach maximum charging current.Then always charging reaches set point until one of battery cell of battery pack reaches the total voltage of charge cutoff voltage or battery pack in the normal situation of charging.Reduce charging current this moment, is charged to that the battery cell that battery pack is arranged again reaches charge cutoff voltage or total voltage reaches set point again.Further reduce afterwards charging current, so circulation reaches set point until charging current reduces to the total voltage that one of the minimum charge current value that sets and battery cell of battery pack reach charge cutoff voltage or battery pack.In whole charging process, in case it is unusual to detect charging, then stop immediately charging, process accordingly according to abnormal conditions.
As shown in Figure 3, in step 301, the charging beginning, putting the initiation of charge electric current is 0.
In step 302, judge that normally whether charging, if charging is normal, then proceed step 303, and if charge undesiredly, then change step 309 charging abnormal ending over to.The whether normal judgement of charging can comprise that battery pack parameter (comprising assembled battery total voltage, monomer voltage, temperature) is whether in normal range (NR), whether battery pack is connected communication with charging station normal, within allowed band, whether charging station works for actual charge current and the deviation of setting charging current.If find any unusually, corresponding abnormality mark then is set, withdraw from current charging process.
In step 303, strengthen charging current A1, keep t3.Wherein, the setting of the added value A1 of charging current can be considered fail safe and quick charge requirement.Preferably, A1 equals 5 amperes; The setting of t3 can consider to send the request that strengthens charging current provides the requirement of stabling current required time to detecting charging station.Preferably, t3 equals 0.5 second.
In step 304, judge whether the charging current after increasing reaches the maximum charging current that allows.If do not reach the maximum charging current that allows, then return step 302.If reached the maximum charging current that allows, then proceeded step 305.The setting of maximum permission charging current can consider the maximum permission trickle charge electric current of battery pack and the sustained ceiling current fan-out capability of charging station.Preferably, maximum charging current is 50 amperes.
In step 305, keep current charging current to batteries charging, and keep t4.Wherein, the setting of retention time t4 can consider and the communication cycle of charging station and unusual fast processing requirement.Preferably, t4 equals 0.1 second.Proceed the operation identical with step 302 after the step 305: judge that namely normally whether charging.If charging is normal, then proceed step 306.
In step 306, judge whether the total voltage that the battery cell voltage whether battery pack is arranged behind the electricity filled the t4 time reaches set point (being the charge cutoff voltage of battery cell voltage) or battery pack reaches set point (being the charge cutoff voltage of assembled battery total voltage).Wherein, the set point of battery cell voltage can adopt the charge cutoff voltage of battery cell manufacturer regulation.Preferably, the charge cutoff voltage of battery cell is set as 4.2 volts.The set point that the charge cutoff voltage of assembled battery total voltage is set as the charge cutoff voltage of battery cell multiply by the quantity of the battery cell of battery pack.Preferably, the charge cutoff voltage set point of assembled battery total voltage is 403 volts.
In step 307, judge whether current charging current is the minimum charge current value that sets, if not, then change step 310 over to.If so, then enter step 308.Wherein, the setting of minimum charge current value is with reference to the constant voltage charge cut-off current of battery production merchant regulation.Preferably, minimum charge current is 2 amperes.
In step 310, reduce charging current A2, keep t5.Wherein, the reduction A2 of charging current can consider the requirement of quick charge equally.Preferably, electric current reduces 2 amperes at every turn, and namely A2 equals 2 amperes, and t5 is 0.5 second.
In step 308, the charging normal termination.It can comprise the charge circuit of disconnection and charging station, sends normal termination charging request to charging station, and end is communicated by letter with charging station, and the charging complement mark is set.
In step 309, the charging abnormal ending.It can comprise disconnection charge circuit (if under the prerequisite that does not have to disconnect), to charging station reporting errors and request complete charge, finishes to communicate by letter with charging station, and the charging error flag is set.
Fig. 4 shows the flow chart of the balanced start-up course that is used for electric automobile of battery pack according to a preferred embodiment of the invention.Battery pack shown in Fig. 1 determining step 104 of not working can comprise that step 401 shown in Figure 4 is to 407; Balanced setting up procedure 105 shown in Fig. 1 can comprise step 408 shown in Figure 4 and 409; Equalization step 106 shown in Fig. 1 can comprise step 410 shown in Figure 4.
As shown in Figure 4, in a preferred embodiment of the invention, battery pack is used for electric automobile, and its balancing procedure can be realized in docking process.Thereby the equalization operation of battery pack does not affect the normal use of vehicle.At first check unbalanced sign after receiving the signal put out spoon that stops, if unbalancedly be masked as 0, namely battery pack is equilibrium state, does not then need equilibrium, with the flame-out the same shutdown system of orderly shutdown.Otherwise whether the voltage of the battery cell of the rear inspection battery pack that waits for a period of time, temperature all carry out if all meet the requirements, just carrying out equalization operation in the balanced setting range allowing.
In step 401, determine to receive and put out a spoon signal namely only have when the operation below the obsolete situation of electric automobile just begins to carry out balanced startup, battery pack balancing etc.
In step 402, unbalanced sign is judged.If unbalancedly be masked as 0, be equilibrium state namely, need not to carry out equilibrium, directly forward step 411 to, finish shutdown system.
In step 403, the setting of timer time can be considered the actual operating position of vehicle, and voltage of the battery cell of battery pack, temperature etc. reach stable time requirement etc.Preferably, the timer timing is 30 minutes.If battery pack temperature is too high or battery cell between excessive temperature differentials, can open at this step controlled circulation cooling system, whenever then temperature reaches set point and namely controls this circulating cooling system and close with energy savings.Temperature reaches set point and refers to temperature within the specific limits, sees 409 steps for details.
In step 403, arrange and the startup timer.Then, carry out step 404, time-delay is waited for.Then carry out step 405, determine whether to receive vehicle activation signal.If received vehicle activation signal, then forward step 406 timeing closing device to, then forward step 411 to and finish shutdown system.If do not receive vehicle activation signal then carry out step 407, determine whether to reach the scheduled time.If do not reach the scheduled time then return step 404, time-delay is waited for again.If reach the scheduled time then carry out step 408, whether the battery cell voltage of determining battery pack is stable and within setting range.The setting range of the battery cell voltage of this battery pack can be decided according to the balanced way of concrete employing: for example for equalization discharge, avoid carrying out equalization discharge when voltage is low; For example for the active equalization mode, can not when cell voltage is too high, carry out equilibrium again.In a preferred embodiment of the invention, the battery cell voltage setting range of equalization discharge can for: 3.4 ~ 4.4 volts; The battery cell voltage range of active equalization can be 3.0 ~ 4.15 volts.If the equalization program after the battery cell voltage of battery pack not in setting range, then can't carry out namely forwards step 411 to and finishes shutdown system.If batteries monomer voltage stabilization and in setting range, then carry out step 409, stable and temperature is within setting range to determine the temperature of battery cell of battery pack, and whether the temperature difference between definite battery cell monomer is within setting range.In a preferred embodiment of the invention, the setting range of the temperature difference between the temperature of the battery cell of battery pack and the battery cell monomer can be respectively: for some balanced way, equalization discharge for example, temperature range is-20 ~ 60 degrees centigrade, temperature difference setting range when the temperature difference is lower than 10 degrees centigrade less than 10 degrees centigrade or minimum temperature more than 10 degrees centigrade the time when minimum temperature the temperature difference less than 5 degrees centigrade; For some balanced way, active equalization for example, temperature range is 0 ~ 40 degree centigrade, and can not have the temperature difference to set.If the temperature of the battery cell of battery pack namely forwards step 411 to and finishes shutdown system or/and the temperature difference of battery cell monomer not within setting range, then can't be carried out equalization program afterwards.If the temperature difference between the temperature of the battery cell of battery pack and the battery cell monomer the two all within setting range, then carry out step 410, the balancing battery group.Fig. 5 and Fig. 6 show respectively the detailed process that utilizes equalization discharge mode and active equalization mode balancing battery group.At last, the balancing battery group is complete then carry out step 411, finishes shutdown system.
Fig. 5 shows the flow chart of the equalization discharge of battery pack according to a preferred embodiment of the invention.Battery pack balancing step 106 shown in Fig. 1 can be as shown in Figure 5.
The implementation of equalization discharge can be discharge resistance by P-type mos field effect transistor (P type MOSFET) control of each battery cell series connection.The battery cell monitoring chip sends Continuity signal to some switch mosfets, and then correspondingly battery discharges by discharge resistance.Preferably, the discharge resistance resistance is 27 ohm.
As shown in Figure 5, at first determine the target voltage of equalization discharge and the battery cell of needs equilibrium according to the battery cell voltage data that gathers, then carry out the equalization discharge of respective battery monomer.In the equalization discharge process, if battery pack is used for electric automobile, if then receive vehicle activation signal or voltage, temperature anomaly signal, then stopping balancing procedure and unbalanced sign, to be set to 2(be interrupt status), otherwise carry out equalization discharge until finish smoothly always.
In step 501, determine equalization target voltage and need balanced battery cell.Wherein, the equalization target voltage SOC difference that can allow according to SOC-OCV curve and the equalization target of the battery cell of battery pack is determined.The SOC-OCV curve of the battery cell of battery pack can obtain in the described battery temperature test in front.In a preferred embodiment of the invention, the SOC difference that equalization target allows is 1%, platform area at the SOC-OCV curve of the battery cell of employing battery pack, the voltage differences of the battery cell of the corresponding battery pack of 1% SOC difference is about 3 millivolts between the battery cell of battery pack, therefore the minimum battery cell voltage that equalization target voltage is set as in the battery pack adds 3 millivolts, need balanced battery cell to be higher than the battery cell of equalization target voltage for all voltages.
In step 502, needs are carried out balanced battery cell discharge.Then, carry out step 503, sustain discharge and retention time t6.The setting of t6 need consider system for the response of the possible abnormal conditions of automobile starting and system, and preferably, t6 is set as 0.5 second.Then carry out step 504, just determine whether arbitrarily to reach discharge target voltage at the battery cell of equalization discharge, if do not have, then carry out step 508, if have, then carry out step 505, the corresponding battery cell that reaches the target discharge voltage is stopped discharge, then carry out step 506, determine whether that all need all discharge offs of balanced battery cell.If all need all discharge offs of balanced battery cell, then carry out step 507, the unbalanced sign of battery pack is set to 0 and withdraw from equilibrium.Need all discharge offs of balanced battery cell if not all, i.e. equilibrium is not finished, and carry out step 508 so, determines whether to receive vehicle activation signal.If receive vehicle activation signal, then carry out step 510, the unbalanced sign of battery pack is set to 2, and namely balancing procedure interrupts, and then withdraws from equilibrium.If do not receive vehicle activation signal, then carry out step 509, determine that the temperature difference between voltage, temperature and the battery cell of the battery cell of battery pack is whether within setting range.In a preferred embodiment of the invention, in step 509, the allowed band of the voltage of the battery cell in the battery pack is 3.4 ~ 4.4 volts, temperature range is-20 ~ 60 degrees centigrade, and temperature difference setting range is: when minimum temperature when the temperature difference is lower than 10 degrees centigrade less than 10 degrees centigrade or minimum temperature more than 10 degrees centigrade the time temperature difference less than 5 degrees centigrade.If the temperature difference between the voltage of the battery cell of battery pack, temperature and the battery cell within setting range, is then got back to step 503, continue time-delay and wait for.If any one among the temperature difference of the voltage of the battery cell of battery pack, temperature and battery cell then carry out step 510 not within setting range, unbalanced sign is set to 2, and namely balancing procedure interrupts, and then withdraws from equilibrium.
Fig. 6 shows the flow chart of the active equalization of battery pack according to a preferred embodiment of the invention.Battery pack balancing step 106 shown in Fig. 1 can be as shown in Figure 6.When carrying out active equalization, need to determine balanced battery cell and need the balanced time by the SOC difference between the battery cell of record battery pack.First the minimum battery cell of SOC is carried out equilibrium in the time of balanced, the minimum battery cell of SOC in the remaining battery cell is carried out equilibrium after finishing, until all need balanced battery cell all to finish equilibrium.
The mode of active equalization can adopt the DC-DC insulating power supply to charge to the low battery cell of SOC in the battery pack.Preferably, the input of DC-DC insulating power supply is vehicle power.Preferably, the input of DC-DC also can be the bus output of power battery pack.The DC-DC insulating power supply is output as constant current output, and maximum output voltage is the charge cutoff voltage of battery cell.In a preferred embodiment of the invention, the size of output current is 2 amperes, and maximum output voltage is 4.2 volts.All battery cells link to each other by the output of gating switch with the DC-DC insulating power supply in the battery pack, and the same time only has one group of switching gate.That is to say that the same time of this balanced way can only carry out charge balancing to a battery cell in the battery pack.
In step 601, judge whether unbalanced sign is 1, namely judge the equalization operation that will carry out be first equalization operation or last time uncompleted equalization operation.If unbalancedly be masked as 1, determine that namely the equalization operation that will carry out is equalization operation first, then carry out step 602, need to determine balanced battery cell and time for balance.Need definite method of balanced battery cell to comprise: according to the SOC data of battery cell, take the highest battery cell of SOC data as standard, all battery cells that are lower than this standard 1% all are to need balanced batteries.Definite method of time for balance can comprise: standard SOC deducts the SOC of battery to be balanced monomer, deducts 0.5% again, then is multiplied by the capacity of battery cell, last electric current divided by active equalization.For example, the highest SOC is 100% as the battery cell of standard, treats that the SOC of balanced battery cell is 95%, and the capacity of battery cell is 70 ampere-hours, and euqalizing current is 2 amperes, and then time for balance is: (100%-95%-0.5%) * 70/2=1.575 hour.After step 602, carry out step 604.If unbalanced sign is not 1, the equalization operation that namely will carry out then carry out step 603 for following uncompleted equalization operation last time, and reading needs balanced battery cell and the data of time for balance.Then, carry out step 604, the battery cell the longest to time for balance charges.In step 604, sort according to the time for balance of battery cell obtained in the previous step, time for balance is long carries out first equilibrium.Its advantage is, even this equilibrium fails to finish smoothly because of various reasons, the partial-equilibrium operation that the battery cell of SOC minimum (namely time for balance is the longest) is carried out also can improve the imbalance of battery pack to a certain extent.After the step 604, carry out step 605, keep charging and retention time t7.Carry out step 606 afterwards, determine whether the balanced battery cell of current needs charges complete, i.e. whether current equilibrium is finished.If current equilibrium is finished, then carry out step 607, determine whether current battery cell is that last needs balanced battery cell.Need balanced battery cell if current battery cell is last, i.e. equilibrium is all finished, and all need balanced battery cell, and all charging is complete; Then carry out step 609, unbalanced sign is set to 0, and carry out step 614, withdraws from equilibrium.Do not need balanced battery cell if current battery cell is not last, then carry out step 608, from battery to be balanced, remove current battery cell data, and change step 604 over to.If current equilibrium is not finished, carry out step 610, determine whether to receive vehicle activation signal.If receive vehicle activation signal, then carry out step 612.And if do not receive vehicle activation signal, then carry out step 611, determine that the voltage, temperature of the battery cell of battery pack are whether within setting range.In a preferred embodiment of the invention, the temperature range of the battery cell of battery pack can be 0 ~ 40 degree centigrade, and the voltage setting range can be 3.0 ~ 4.15 volts.If the voltage of battery pack, temperature all within setting range, then go back to step 605, continue to keep charging current and retention time t7.If the voltage of battery pack, temperature among the two any one not within setting range, then carry out step 612, the time for balance of current battery cell is deducted time for balance, then carry out step 613, store all and do not finish balanced battery cell and the data of time for balance, and unbalanced sign is set to 2, i.e. balanced interrupt status.After the step 613, carry out step 614, withdraw from equilibrium.
On the other hand, the present invention also provides a kind of system for the balancing battery group.Fig. 7 shows the system 700 that is used for according to the preferred embodiment of the invention the balancing battery group.As shown in Figure 7, this system comprises: the battery pack balancing mode is determined that device 701, battery pack are not worked and is determined device 704 and battery pack balancing device 706.Wherein, the battery pack balancing mode determines that device 701 is configured to for determining according to the selected balanced way of the battery consistency of battery pack.Battery pack is not worked and is determined that device 704 is configured to not work for definite battery pack.Battery pack balancing device 706 is configured to be used to utilizing determined balanced way balancing battery group.
According to a preferred embodiment of the present invention, the battery consistency of battery pack is determined by the battery cycle life test.
According to a preferred embodiment of the present invention, balanced way can comprise equalization discharge mode and active equalization mode; Wherein, the equalization discharge mode is selected when the parameter of expression battery consistency is less than or equal to threshold value, and the active equalization mode is selected when the parameter of expression battery consistency is higher than threshold value.Preferably, this threshold value can be 5%.
According to a preferred embodiment of the present invention, the system 700 that is used for the balancing battery group can also comprise that the battery pack balancing state determines device 703, and it is configured to determine for not working in battery pack that device 704 determines that battery pack determine the equilibrium state of battery pack before not working.
According to a preferred embodiment of the present invention, the system 700 that is used for the balancing battery group can also comprise batteries charging control device 702, and it is configured to the charging process of battery pack being carried out before the equilibrium state of determining battery pack be used to being controlled at.
According to a preferred embodiment of the present invention, batteries charging control device 702 also is configured to open for controlled circulation cooling system before charging process, and determines that at the battery pack balancing state controlled circulation cooling system cuts out after device 703 is determined the equilibrium state of described battery pack.
According to a preferred embodiment of the present invention, the system 700 that is used for the balancing battery group can also comprise balanced starting drive 705, its be configured to voltage for the described battery cell of determining described battery pack reach stable and determine the voltage of described battery cell of described battery pack and temperature within setting range separately.
According to a preferred embodiment of the present invention, balanced starting drive 705 also is configured to for the temperature difference between the described battery cell of determining described battery pack less than preset value.Wherein, described preset value is determined by the battery temperature test.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just is used for for example and the purpose of explanation, but not is intended to the present invention is limited in the described scope of embodiments.It will be appreciated by persons skilled in the art that in addition the present invention is not limited to above-described embodiment, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modifications all drop in the present invention's scope required for protection.Protection scope of the present invention is defined by the appended claims and equivalent scope thereof.
Claims (20)
1. method that is used for the balancing battery group comprises:
Determine according to the selected balanced way of the battery consistency of battery pack;
Determine that described battery pack do not work; And
Utilize the balanced described battery pack of determined balanced way.
2. method according to claim 1 is characterized in that, determines that described described battery pack also comprises before not working: the equilibrium state of determining described battery pack.
3. method according to claim 2 is characterized in that, the equilibrium state of described definite described battery pack comprises:
The voltage of determining the battery cell of described battery pack reaches stable; And
Determine that the magnitude relationship of voltage pressure reduction between the described battery cell of described battery pack and set point is to determine the equilibrium state of described battery pack.
4. method according to claim 2 is characterized in that, also comprises: be controlled at the charging process of described battery pack being carried out before the described equilibrium state of determining described battery pack.
5. method according to claim 4 is characterized in that, described charging process comprises:
In the situation that guarantee will be increased to the maximum charging current that allows from zero to the charging current of described batteries charging safely, keep described maximum permission charging current to reach set point until one of battery cell of described battery pack reaches the total voltage of charge cutoff voltage or described battery pack; And
Progressively reduce described charging current to described batteries charging until it reaches the minimum charge current of setting.
6. method according to claim 4 is characterized in that,
Also comprise before described charging process: the controlled circulation cooling system is opened; And
Determine also to comprise after the equilibrium state of described battery pack described: control described circulating cooling system and close.
7. method according to claim 6 is characterized in that, the equilibrium state of described definite described battery pack also comprises:
Utilize described circulating cooling system to make the temperature difference between the battery cell of described battery pack less than preset value;
Wherein, described preset value is determined by the battery temperature test.
8. method according to claim 1 is characterized in that, does not also comprise after described definite battery pack is worked and before the described battery pack of described equilibrium: balanced start-up course, and it comprises:
The voltage of determining the battery cell of described battery pack reaches stable; And
Determine that the voltage of described battery cell of described battery pack and temperature are within setting range separately.
9. method according to claim 8 is characterized in that, described balanced start-up course also comprises:
Determine that the temperature difference between the described battery cell of described battery pack is less than preset value;
Wherein, described preset value is determined by the battery temperature test.
10. method according to claim 1 is characterized in that,
Described balanced way comprises equalization discharge mode and active equalization mode;
Wherein, described equalization discharge mode is selected when the parameter of the described battery consistency of expression is less than or equal to threshold value, and described active equalization mode is selected when the parameter of the described battery consistency of described expression is higher than described threshold value.
11. method according to claim 1 is characterized in that, described battery consistency is determined by the battery cycle life test.
12. method according to claim 11 is characterized in that,
In the test of described battery cycle life, test the quantity that used number of batteries equals the battery cell in the described battery pack, perhaps be less than the quantity of the described battery cell in the described battery pack but be no less than 10.
13. a system that is used for the balancing battery group comprises:
The battery pack balancing mode is determined device, and it is configured to for determining according to the selected balanced way of the battery consistency of battery pack;
Battery pack definite device of not working, it is configured to not work for definite described battery pack; And
Battery pack balancing device, it is configured to be used to utilizing the balanced described battery pack of determined balanced way.
14. system according to claim 13 is characterized in that, described system also comprises:
The battery pack balancing state is determined device, and it is configured to for the equilibrium state of determining described battery pack before not working in described definite described battery pack.
15. system according to claim 14 is characterized in that, described system also comprises:
The batteries charging control device, it is configured to the charging process of described battery pack being carried out before the described equilibrium state of determining described battery pack be used to being controlled at.
16. system according to claim 15, it is characterized in that, described batteries charging control device also is configured to open for controlled circulation cooling system before described charging process, and the described circulating cooling system of control is closed after the equilibrium state of described definite described battery pack.
17. system according to claim 13 is characterized in that, described system also comprises:
Balanced starting drive, its be configured to voltage for the battery cell of determining described battery pack reach stable and determine the voltage of described battery cell of described battery pack and temperature within setting range separately.
18. system according to claim 17 is characterized in that,
Described balanced starting drive also is configured to for the temperature difference between the described battery cell of determining described battery pack less than preset value;
Wherein, described preset value is determined by the battery temperature test.
19. system according to claim 13 is characterized in that,
Described balanced way comprises equalization discharge mode and active equalization mode;
Wherein, described equalization discharge mode is selected when the parameter of the described battery consistency of expression is less than or equal to threshold value, and described active equalization mode is selected when the parameter of the described battery consistency of described expression is higher than described threshold value.
20. system according to claim 13 is characterized in that, described battery consistency is determined by the battery cycle life test.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210545178.5A CN103023111B (en) | 2012-12-14 | 2012-12-14 | A kind of method and system for balancing battery group |
| HK13108703.6A HK1181560A1 (en) | 2012-12-14 | 2013-07-24 | A method and system for equalizing a battery pack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210545178.5A CN103023111B (en) | 2012-12-14 | 2012-12-14 | A kind of method and system for balancing battery group |
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| CN103023111B CN103023111B (en) | 2016-02-10 |
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| CN109884532A (en) * | 2019-03-06 | 2019-06-14 | 郑州大学 | A kind of power grid energy-storage battery detection device and detection method |
| CN110525270A (en) * | 2019-08-02 | 2019-12-03 | 昆山宝创新能源科技有限公司 | Battery pack equilibrium method, system and vehicle |
| CN111103549A (en) * | 2019-12-16 | 2020-05-05 | 中车大连机车车辆有限公司 | Method for judging maintenance requirement of battery system of hybrid power locomotive |
| CN113422423A (en) * | 2021-08-25 | 2021-09-21 | 绵阳天仪空间科技有限公司 | Satellite storage battery system |
| WO2023206484A1 (en) * | 2022-04-29 | 2023-11-02 | 时代电服科技有限公司 | Battery swapping method and device, and station control system and electric device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103023111B (en) | 2016-02-10 |
| HK1181560A1 (en) | 2013-11-08 |
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