CN110015181A - Battery equalization method, device and vehicle - Google Patents
Battery equalization method, device and vehicle Download PDFInfo
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- CN110015181A CN110015181A CN201710736489.2A CN201710736489A CN110015181A CN 110015181 A CN110015181 A CN 110015181A CN 201710736489 A CN201710736489 A CN 201710736489A CN 110015181 A CN110015181 A CN 110015181A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003068 static effect Effects 0.000 claims abstract description 44
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims description 15
- 238000009966 trimming Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000000178 monomer Substances 0.000 description 9
- 238000004321 preservation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This disclosure relates to a kind of battery equalization method, device and vehicle.This method comprises: in the case where battery pack is in static operating condition, according to the open-circuit voltage values of single battery each in the battery pack, generate equalization information, after the battery pack enters dynamic operation condition by the static operating condition, it is balanced to needing balanced single battery to carry out in the battery pack according to the equalization information.Since the open-circuit voltage values of each single battery are more accurate in battery pack under static operating condition, it is not influenced by internal resistance and charging and discharging currents, so the equalization information generated is more accurate, it is carried out according to accurate equalization information balanced, a possibility that accidentally balanced is reduced, balanced accuracy is improved.Also, since the open-circuit voltage values of single battery are relatively easy to measure, so simplifying balancing procedure.
Description
Technical field
This disclosure relates to battery technology field, and in particular, to a kind of battery equalization method, device and vehicle.
Background technique
It is made of for the battery pack that electric car provides power more piece single battery.It is limited by production technology, or
Person can generate inconsistency with the increase that number is recycled, between single battery.Inconsistency between single battery can contract
The service life of short battery pack increases use cost to reduce the continual mileage of electric car.Therefore, battery management system
It needs to be determined that whether each single battery needs equilibrium in battery pack, and balanced to needing balanced single battery to carry out, with contracting
Inconsistency between minor comonomer battery.
Summary of the invention
Purpose of this disclosure is to provide a kind of battery equalization method, device and vehicles, to overcome present in the relevant technologies
Problem.
In order to achieve the above object, according to the first aspect of the embodiments of the present disclosure, a kind of battery equalization method is provided, is wrapped
It includes:
In the case where battery pack is in static operating condition, determine whether the battery pack meets preset condition, the preset condition is
The standing duration of the battery pack is greater than preset duration, and the maximum temperature difference in the battery pack between each single battery is less than
Preset temperature value；
When the battery pack meets the preset condition, according to the open-circuit voltage of single battery each in the battery pack
Value, generates equalization information, and the equalization information characterizes whether each single battery in the battery pack needs equilibrium；
After the battery pack enters dynamic operation condition by the static operating condition, according to the equalization information, to the battery
Balanced single battery is needed to carry out in packet balanced.
Optionally, when the battery pack meets the preset condition, according to single battery each in the battery pack
Open-circuit voltage values generate equalization information, comprising:
When the battery pack meets the preset condition, the open-circuit voltage of each single battery in the battery pack is determined
The minimum open circuit voltage value of value, and determine the average temperature value of the temperature value of each single battery in the battery pack；
According to the corresponding relationship and the average temperature value between temperature, open-circuit voltage values and SOC value, by the minimum
Open-circuit voltage values are converted to minimum SOC value；
It is opened according to the corresponding relationship, the average temperature value and the corresponding SOC threshold of the minimum SOC value, determination
Road voltage threshold；
According to the size between the open-circuit voltage values of single battery each in the battery pack and the open-circuit voltage threshold value
Relationship generates the equalization information, wherein open-circuit voltage values are greater than the monomer electricity of the open-circuit voltage threshold value in the battery pack
Pond is to need balanced single battery.
Optionally, the method also includes:
When the battery pack does not meet the preset condition, the last equalization information saved is obtained；
After the battery pack enters dynamic operation condition by the static operating condition, according to the equalization information, to the battery
Balanced single battery is needed to carry out in packet balanced, comprising:
After the battery pack enters dynamic operation condition by the static operating condition, according to the last balanced letter saved
Breath, it is balanced to needing balanced single battery to carry out in the battery pack.
Optionally, after needing balanced single battery to carry out equilibrium in the battery pack, the method also includes:
Determine the load voltage values for needing balanced single battery；
Detect whether the load voltage values for needing balanced single battery are less than stopping trimming threshold；
The single battery for stopping trimming threshold being less than to load voltage values and stops equilibrium.
Optionally, the static operating condition is the operating condition without charging and discharging currents in the battery pack, and the dynamic operation condition is institute
State the operating condition for there are charging and discharging currents in battery pack.
A kind of battery balanced device is provided according to the second aspect of an embodiment of the present disclosure, and described device includes:
First determining module, for determining whether the battery pack meets default item in the case where battery pack is in static operating condition
Part, the preset condition are that the standing duration of the battery pack is greater than preset duration, and each single battery in the battery pack
Between maximum temperature difference be less than preset temperature value；
Generation module, for when the battery pack meets the preset condition, according to monomer each in the battery pack
The open-circuit voltage values of battery, generate equalization information, and the equalization information characterizes whether each single battery in the battery pack needs
Want balanced；
Balance module, for being believed after the battery pack enters dynamic operation condition by the static operating condition according to the equilibrium
Breath, it is balanced to needing balanced single battery to carry out in the battery pack.
Optionally, the generation module includes:
First determines submodule, each in the battery pack for determining when the battery pack meets the preset condition
The minimum open circuit voltage value of the open-circuit voltage values of a single battery, and determine the temperature value of each single battery in the battery pack
Average temperature value；
Transform subblock, for according between temperature, open-circuit voltage values and SOC value corresponding relationship and the average temperature
The minimum open circuit voltage value is converted to minimum SOC value by angle value；
Second determines submodule, for according to the corresponding relationship, the average temperature value and the minimum SOC value pair
The SOC threshold answered determines open-circuit voltage threshold value；
Submodule is generated, for according to the open-circuit voltage values of single battery each in the battery pack and the open-circuit voltage
Size relation between threshold value generates the equalization information, wherein open-circuit voltage values are greater than the open circuit electricity in the battery pack
The single battery of pressure threshold value is to need balanced single battery.
Optionally, described device further include:
Module is obtained, for when the battery pack does not meet the preset condition, obtaining the last balanced letter saved
Breath；
The balance module includes:
Balanced submodule, for after the battery pack enters dynamic operation condition by the static operating condition, according to described upper one
The equalization information of secondary preservation, it is balanced to needing balanced single battery to carry out in the battery pack.
Optionally, described device further include:
Second determining module, for determining the load voltage values for needing balanced single battery；
Detection module, for detecting whether the load voltage values for needing balanced single battery are less than the balanced threshold of stopping
Value；
Stopping modular stops equilibrium for being less than the single battery for stopping trimming threshold to load voltage values.
The disclosure third aspect provides a kind of vehicle, comprising: battery described in battery pack and disclosure second aspect is equal
Weigh device, and the battery balanced device is connected with the battery pack.
The battery equalization method provided using the embodiment of the present disclosure, in the case where battery pack is in static operating condition, according to battery pack
In each single battery open-circuit voltage values, generate for characterizing whether each single battery in battery pack needs balanced equilibrium
Information, and after battery pack enters dynamic operation condition, according to the equalization information generated under static operating condition, to the monomer for needing equilibrium
Battery carries out balanced.Since the open-circuit voltage values of the single battery under static operating condition are more accurate, not by internal resistance and charge and discharge
The influence of electric current carries out equilibrium according to accurate equalization information, reduces mistake so the equalization information generated is more accurate
A possibility that balanced, improves balanced accuracy.Also, since the open-circuit voltage values of single battery are relatively easy to measure, so
Simplify balancing procedure.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of flow chart for battery equalization method that the embodiment of the present disclosure provides.
Fig. 2 is the open circuit during a kind of battery equalization method that the embodiment of the present disclosure provides includes the steps that according to single battery
The flow chart of voltage value generation equalization information.
Fig. 3 is a kind of another flow chart for battery equalization method that the embodiment of the present disclosure provides.
Fig. 4 is a kind of block diagram for battery balanced device that the embodiment of the present disclosure provides.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
The embodiment of the present disclosure provides a kind of battery equalization method, referring to FIG. 1, Fig. 1 is one that the embodiment of the present disclosure provides
The flow chart of kind battery equalization method, as shown in Figure 1, method includes the following steps:
Step S11: in the case where battery pack is in static operating condition, determining whether the battery pack meets preset condition, described pre-
If the standing duration that condition is the battery pack is greater than preset duration, and the maximum in the battery pack between each single battery
The temperature difference is less than preset temperature value；
Step S12: when the battery pack meets the preset condition, according to single battery each in the battery pack
Open-circuit voltage values, generate equalization information, and the equalization information characterizes whether each single battery in the battery pack needs equilibrium；
Step S13: right according to the equalization information after the battery pack enters dynamic operation condition by the static operating condition
Balanced single battery is needed to carry out in the battery pack balanced.
Wherein, static operating condition refers to that battery pack is even connected with the mains or electrical equipment, but the relay in battery pack is
Opening state, the operating condition without charging and discharging currents in battery pack flow in single battery without charging and discharging currents in this condition, can be with
The open-circuit voltage values of the single battery are measured, which not will receive the influence of internal resistance of single cell size, measure
Open-circuit voltage values are more accurate, meanwhile, under the operating condition, the linear relationship of open-circuit voltage values and SOC value is good, between the two may be used
Accurately to convert.
Dynamic operation condition refers to that battery pack is even connected with the mains or electrical equipment, while the relay in battery pack is closed form
State has the operating condition of charging and discharging currents in battery pack, has charging and discharging currents flowing in single battery in this state, can measure this
The load voltage values of single battery, the load voltage values are influenced by charging and discharging currents and internal resistance size, and under dynamic operation condition,
The linear relationship of load voltage values and SOC value is unobvious, and the accuracy converted between the two is poor.
The open-circuit voltage values that each single battery in battery pack is measured by battery parameter test module, according to open circuit electricity
Pressure value, generates equalization information accordingly, and whether each single battery which is used to characterize in the battery pack needs
Weighing apparatus.
During generating equalization information, need to according to the corresponding relationship between temperature, open-circuit voltage values and SOC value, into
Conversion between row open-circuit voltage values and SOC value, but only under certain conditions, between open-circuit voltage values and SOC value
It with good linear relationship, could accurately be converted between open-circuit voltage values and SOC value, it is therefore desirable to which default item is set
Part, and the preset condition be battery pack standing duration be greater than preset duration, and in battery pack between each single battery most
The big temperature difference is less than preset temperature value, wherein preset duration and preset temperature value can be battery pack default setting, can also be with
It is user's self-setting.
There are multiple temperature sensors in battery pack, to measure the temperature value of each single battery respectively, between single battery
Maximum temperature difference be battery pack in the highest single battery of temperature temperature value and the minimum single battery of temperature temperature value it
Between difference.When due to excessive temperature differentials between single battery, be unfavorable for carrying out each single battery it is balanced, or even can be to electricity
Irreversible destruction is caused in pond, therefore it is required that the maximum temperature difference between each single battery is less than preset temperature value.
Illustratively, it is assumed that preset duration is 15 minutes, and preset temperature value is 5 DEG C, and the time of repose of battery pack A is 20 points
Clock contains 3 single batteries: single battery 1, single battery 2 and single battery 3 in battery pack A.Wherein, single battery 1
Temperature is 5 DEG C, and the temperature of single battery 1 is 8 DEG C, and the temperature of single battery 3 is 4 DEG C, therefore each monomer electricity in battery pack A
Maximum temperature difference between pond is 4 DEG C.Since the standing duration of battery pack A is greater than 15 minutes, and each single battery in battery pack A
Between maximum temperature difference less than 5 DEG C, then battery pack A meets preset condition, it can be determined that each single battery is in battery pack A
It is no to need equilibrium, and then generate equalization information.
Under static operating condition, it is contemplated that the temperature difference between the standing duration and single battery of battery pack, so, institute's benefit
Corresponding relationship between temperature, open-circuit voltage values and SOC value is more accurate, thus the open-circuit voltage values measured are compared with subject to
Really, the equalization information of generation is also more accurate.
Optionally, the specific embodiment of equalization information is generated according to the open-circuit voltage of single battery, as shown in Fig. 2, packet
Include following steps:
Step S111: when the battery pack meets the preset condition, each single battery in the battery pack is determined
Open-circuit voltage values minimum open circuit voltage value, and determine the mean temperature of the temperature value of each single battery in the battery pack
Value；
Step S112: according to the corresponding relationship and the average temperature value between temperature, open-circuit voltage values and SOC value,
The minimum open circuit voltage value is converted into minimum SOC value, wherein SOC value is the current remaining capacity and specified electricity of single battery
The ratio of amount；
Step S113: according to the corresponding relationship, the average temperature value and the corresponding SOC threshold of the minimum SOC value
Value, determines open-circuit voltage threshold value；
Step S114: according to the open-circuit voltage values of single battery each in the battery pack and the open-circuit voltage threshold value it
Between size relation, generate the equalization information, wherein in the battery pack open-circuit voltage values be greater than the open-circuit voltage threshold value
Single battery be to need balanced single battery.
In the case where battery pack is in static operating condition, whether single battery needs balanced judgment principle are as follows: monomer in battery pack
Whether the SOC value of battery is greater than SOC threshold, which is to increase by one on the basis of the minimum SOC value of the battery pack in advance
If what numerical value obtained, which is the numerical value greater than 0, for example, it may be 5%.The default value can be battery pack and go out
Factory's setting, it is also possible to user's self-setting, if the SOC value of single battery is greater than the SOC threshold, the single battery
Equilibrium is needed, if the SOC value of single battery is not more than the SOC threshold, which does not need equilibrium.
The acquisition of the SOC value of single battery is the average temperature value of the open-circuit voltage values and battery pack according to single battery,
Using the corresponding relationship between temperature, open-circuit voltage values and SOC value, table look-up.Since battery pack is by several hundred a monomer electricity
Pond composition, the SOC value of each single battery are required to search and be obtained, it is therefore desirable to which each monomer electricity can be obtained by looking into several hundred secondary tables
Then the SOC value in pond determines the minimum SOC value of battery pack, then determines SOC threshold, whether finally judge each single battery
Need equilibrium, larger workload.
Therefore, it will judge whether the single battery needs according to the SOC value of single battery in the embodiments of the present disclosure
Weighing apparatus, is converted into judging that the single battery is whether to need equilibrium according to the open-circuit voltage values of single battery.
Under static operating condition, the temperature of each single battery in the battery pack is measured using the temperature sensor in battery pack
The average temperature value (easy for description, to be denoted as T_mean) of value, under the operating condition, without charging and discharging currents in battery pack, utilizes electricity
Pond parametric testing module can relatively accurately measure the open-circuit voltage values of each single battery in battery pack, and then determine battery
The minimum open circuit voltage value (easy for description, to be denoted as Vcell_min) of packet, then according to pair of temperature, open-circuit voltage and SOC value
It should be related to (i.e. T_OCV_SOC curve), table look-up to obtain minimum SOC value (easy for description, to be denoted as SoC_min).
Then, SOC threshold (easy for description, to be denoted as SoC_bal) is determined using the minimum SOC value, as it was noted above, should
SOC threshold is to increase a default value on the basis of minimum SOC value to obtain, illustratively, SoC_bal=SoC_min+
5%.
In known T_mean, SoC_bal, according to corresponding relationship (the i.e. T_OCV_SOC of temperature, open-circuit voltage and SOC value
Curve), it tables look-up again, SOC threshold is converted into open-circuit voltage threshold value (easy for description, to be denoted as V_bal), wherein V_bal is
It is to judge whether each single battery needs balanced critical value in the battery pack corresponding to the open-circuit voltage values of SoC_bal.It will
The open-circuit voltage values of single battery generate equalization information compared with the open-circuit voltage threshold value, and open-circuit voltage values are big in battery pack
It is to need balanced single battery in the single battery of V_bal.
Using the above method, under static operating condition, it is only necessary to carry out it is above-mentioned table look-up twice, can opening according to single battery
Road voltage value, determines whether the single battery needs equilibrium, without repeatedly tabling look-up, reduces calculation amount.
After battery pack enters dynamic operation condition by static operating condition, according to the equalization information, to needing equilibrium in the battery pack
Single battery carry out it is balanced, be between the single battery and containing charge less single battery more containing charge into
Row electric charge transfer carries out equilibrium to the single battery in the battery pack to reduce the charge differences even being eliminated between the two
Precondition are as follows: generated in equalization information under static operating condition, at least one single battery is to need equilibrium, if the electricity
All single batteries do not need equilibrium in the packet of pond, then do not execute equalization operation under dynamic operation condition.
In the embodiments of the present disclosure, it is under static operating condition that whether each single battery, which needs balanced judgement, in battery pack
It carries out, under the operating condition, is flowed in battery pack without charging and discharging currents, the open-circuit voltage values according to each single battery are sentenced
It is disconnected, equalization information is generated, it is balanced to needing balanced single battery to carry out according to the equalization information under dynamic operation condition, it is not right
Whether single battery needs equilibrium to be judged, i other words, whether need balanced judgement to occur over just battery single battery
Packet is under static operating condition, and under the operating condition, the open-circuit voltage values of single battery not will receive internal resistance and charging and discharging currents
It influencing, the open-circuit voltage values measured are more accurate, and therefore, the equalization information generated according to the open-circuit voltage values is also more accurate,
A possibility that accidentally balanced is reduced, balanced accuracy is improved.
Optionally, when the preset condition is unsatisfactory for, the method also includes following steps:
When the battery pack does not meet the preset condition, the last equalization information saved is obtained；
After the battery pack enters dynamic operation condition by the static operating condition, according to the equalization information, to the battery
Balanced single battery is needed to carry out in packet balanced, comprising:
After the battery pack enters dynamic operation condition by the static operating condition, according to the last balanced letter saved
Breath, it is balanced to needing balanced single battery to carry out in the battery pack.
If be unsatisfactory in view of the preset condition, such as: the standing duration of battery pack is less than preset duration, or
Maximum temperature difference in battery pack between each single battery is not less than preset temperature value, or occurs above-mentioned two situations simultaneously
When, whether equilibrium is not needed to judge each single battery in the battery pack, upper one can be read from memory at this time
The equalization information of secondary preservation, and according to the equalization information, after battery pack enters dynamic operation condition by static operating condition, to the battery pack
It is middle that balanced single battery is needed to carry out equilibrium, it adopts this method, even if under static operating condition, when preset condition is ungratified
It waits, also available accurate equalization information, and under dynamic operation condition, using the equalization information to the monomer for needing equilibrium
Battery carries out balanced.
Referring to FIG. 3, Fig. 3 is a kind of another flow chart for battery equalization method that the embodiment of the present disclosure provides, such as Fig. 3 institute
Show, this method is further comprising the steps of other than including step S11, step S12 and step S13:
Step S14: the load voltage values for needing balanced single battery are determined；
Step S15: whether the detection load voltage values for needing balanced single battery are less than stopping trimming threshold；
Step S16: the single battery for stopping trimming threshold being less than to load voltage values and stops equilibrium.
Specifically, when battery pack enters dynamic operation condition, whether equilibrium is not needed to judge single battery, only
It is according to the equalization information generated under static operating condition, equalization information shows that a single battery is to need balanced single battery,
The equalization instruction for being directed to the single battery is then generated, then the single battery is carried out according to equalization instruction balanced.
If overcharged during equilibrium, over-current phenomenon avoidance, irreversible destruction can be all caused to single battery,
It even will cause safety accident, therefore in the embodiments of the present disclosure, preset a stopping trimming threshold, the size of the outage threshold
Temperature and access times between battery Packet type, mould group is related.
The load voltage values for needing balanced single battery are determined in real time in balancing procedure, when the load electricity of single battery
When pressure value is greater than the stopping trimming threshold, equilibrium is continued to the single battery, when the load voltage values of single battery are less than
When the stopping trimming threshold, equilibrium is stopped to the single battery, adopting this method can be in time to by balanced list
Body battery stops balanced, avoids the overcharging of single battery, over-current phenomenon avoidance, improves the service efficiency of single battery.
Optionally, after executing the step S16, the load voltage values of the single battery have been less than stopping trimming threshold,
Equilibrium cannot be carried out to it again, need to remove equalization instruction corresponding with the single battery equalization operation at this time, and quiet
Single battery equalization information generated is directed under state operating condition, to prevent after next time powers on, when preset condition is unsatisfactory for,
The equalization information or equalization instruction are utilized again, and harm caused by forcing equilibrium is carried out to the single battery.In lower electricity,
If needing the equalization information by the also not balanced single battery finished to be stored in storage there are also the not balanced single battery finished
In device, after powering in order to next time, continue to carry out the not balanced single battery finished balanced.
In addition, during single battery carries out balanced, if the temperature in the battery pack is excessively high or battery pack goes out
When existing failure etc. is unfavorable for the state of single battery equilibrium, in this state, continue to carry out the single battery of the battery pack equal
Weighing apparatus operation, may shorten the service life of battery pack, will cause safety accident when serious, therefore, when there is above-mentioned state,
It need to stop equilibrium.After stopping equilibrium, equalization instruction corresponding with equalization operation is removed, is retained under static operating condition and generates
Equalization information, and by the equalization information storage in memory, in order to be unfavorable for single battery equilibrium state elimination
Later, continue balanced to needing balanced single battery to carry out.
The above method is used, even if above-mentioned preset condition is unsatisfactory for after power on next time, can not be given birth under static operating condition
When at equalization information, the equalization information of last preservation can also be obtained from memory, and then according to the equal of last time preservation
Weigh information, balanced to needing balanced single battery to carry out in the battery pack.
Based on the same inventive concept, the embodiment of the present disclosure also provides a kind of battery balanced device.Referring to FIG. 4, Fig. 4 is this
A kind of block diagram for battery balanced device that open embodiment provides.As shown in figure 4, the device 400 includes:
First determining module 401, for it is default to determine whether the battery pack meets in the case where battery pack is in static operating condition
Condition, the preset condition are that the standing duration of the battery pack is greater than preset duration, and each monomer is electric in the battery pack
Maximum temperature difference between pond is less than preset temperature value；
Generation module 402, for when the battery pack meets the preset condition, according to list each in the battery pack
The open-circuit voltage values of body battery generate equalization information, and whether each single battery in the equalization information characterization battery pack
Need equilibrium；
Balance module 403, for after the battery pack enters dynamic operation condition by the static operating condition, according to the equilibrium
Information, it is balanced to needing balanced single battery to carry out in the battery pack, wherein the static state operating condition is in the battery pack
Operating condition without charging and discharging currents, the dynamic operation condition are the operating condition for having charging and discharging currents in the battery pack.
Optionally, which includes:
First determines submodule, each in the battery pack for determining when the battery pack meets the preset condition
The minimum open circuit voltage value of the open-circuit voltage values of a single battery, and determine the temperature value of each battery modules in the battery pack
Average temperature value；
Transform subblock, for according between temperature, open-circuit voltage values and SOC value corresponding relationship and the average temperature
The minimum open circuit voltage value is converted to minimum SOC value by angle value；
Second determines submodule, for according to the corresponding relationship, the average temperature value and the minimum SOC value pair
The SOC threshold answered determines open-circuit voltage threshold value；
Submodule is generated, for according to the open-circuit voltage values of single battery each in the battery pack and the open-circuit voltage
Size relation between threshold value generates the equalization information, wherein open-circuit voltage values are greater than the open circuit electricity in the battery pack
The single battery of pressure threshold value is to need balanced single battery.
Optionally, described device further include:
Module is obtained, for when the battery pack does not meet the preset condition, obtaining the last balanced letter saved
Breath；
The balance module includes:
Balanced submodule, for after the battery pack enters dynamic operation condition by the static operating condition, according to described upper one
The equalization information of secondary preservation, it is balanced to needing balanced single battery to carry out in the battery pack.
Optionally, described device further include:
Second determining module, for determining the load voltage values for needing balanced single battery；
Detection module, for detecting whether the load voltage values for needing balanced single battery are less than the balanced threshold of stopping
Value；
Stopping modular stops equilibrium for being less than the single battery for stopping trimming threshold to load voltage values.
Based on the same inventive concept, the embodiment of the present disclosure additionally provides a kind of vehicle, comprising: battery pack and the disclosure are real
The battery balanced device of example offer is applied, the battery balanced device is connected with the battery pack.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (10)
1. a kind of battery equalization method characterized by comprising
In the case where battery pack is in static operating condition, determine whether the battery pack meets preset condition, the preset condition is described
The standing duration of battery pack is greater than preset duration, and the maximum temperature difference in the battery pack between each single battery is less than default
Temperature value；
When the battery pack meets the preset condition, according to the open-circuit voltage values of single battery each in the battery pack,
Equalization information is generated, the equalization information characterizes whether each single battery in the battery pack needs equilibrium；
After the battery pack enters dynamic operation condition by the static operating condition, according to the equalization information, in the battery pack
Balanced single battery is needed to carry out balanced.
2. the method according to claim 1, wherein when the battery pack meets the preset condition, according to
The open-circuit voltage values of each single battery in the battery pack generate equalization information, comprising:
When the battery pack meets the preset condition, the open-circuit voltage values of each single battery in the battery pack are determined
Minimum open circuit voltage value, and determine the average temperature value of the temperature value of each single battery in the battery pack；
According to the corresponding relationship and the average temperature value between temperature, open-circuit voltage values and SOC value, by the minimum open circuit
Voltage value is converted to minimum SOC value；
According to the corresponding relationship, the average temperature value and the corresponding SOC threshold of the minimum SOC value, open circuit electricity is determined
Press threshold value；
According to the size relation between the open-circuit voltage values of single battery each in the battery pack and the open-circuit voltage threshold value,
Generate the equalization information, wherein open-circuit voltage values are greater than the single battery of the open-circuit voltage threshold value in the battery pack
Need balanced single battery.
3. the method according to claim 1, wherein the method also includes:
When the battery pack does not meet the preset condition, the last equalization information saved is obtained；
After the battery pack enters dynamic operation condition by the static operating condition, according to the equalization information, in the battery pack
Balanced single battery is needed to carry out balanced, comprising:
It is right according to the last equalization information saved after the battery pack enters dynamic operation condition by the static operating condition
Balanced single battery is needed to carry out in the battery pack balanced.
4. the method according to claim 1, wherein needed in the battery pack balanced single battery into
After row is balanced, the method also includes:
Determine the load voltage values for needing balanced single battery；
Detect whether the load voltage values for needing balanced single battery are less than stopping trimming threshold；
The single battery for stopping trimming threshold being less than to load voltage values and stops equilibrium.
5. the method according to claim 1, wherein the static state operating condition is in the battery pack without charge and discharge electricity
The operating condition of stream, the dynamic operation condition are the operating condition for having charging and discharging currents in the battery pack.
6. a kind of battery balanced device, which is characterized in that described device includes:
First determining module, for determining whether the battery pack meets preset condition, institute in the case where battery pack is in static operating condition
It states the standing duration that preset condition is the battery pack and is greater than preset duration, and in the battery pack between each single battery
Maximum temperature difference is less than preset temperature value；
Generation module, for when the battery pack meets the preset condition, according to single battery each in the battery pack
Open-circuit voltage values, generate equalization information, the equalization information characterizes whether each single battery in the battery pack needs
Weighing apparatus；
Balance module, it is right according to the equalization information for after the battery pack enters dynamic operation condition by the static operating condition
Balanced single battery is needed to carry out in the battery pack balanced.
7. device according to claim 6, which is characterized in that the generation module includes:
First determines submodule, for determining each list in the battery pack when the battery pack meets the preset condition
The minimum open circuit voltage value of the open-circuit voltage values of body battery, and determine the flat of the temperature value of each single battery in the battery pack
Equal temperature value；
Transform subblock, for according between temperature, open-circuit voltage values and SOC value corresponding relationship and the mean temperature
Value, is converted to minimum SOC value for the minimum open circuit voltage value；
Second determines submodule, for corresponding according to the corresponding relationship, the average temperature value and the minimum SOC value
SOC threshold determines open-circuit voltage threshold value；
Submodule is generated, for the open-circuit voltage values and the open-circuit voltage threshold value according to single battery each in the battery pack
Between size relation, generate the equalization information, wherein in the battery pack open-circuit voltage values be greater than the open-circuit voltage threshold
The single battery of value is to need balanced single battery.
8. device according to claim 6, which is characterized in that described device further include:
Module is obtained, for when the battery pack does not meet the preset condition, obtaining the last equalization information saved；
The balance module includes:
Balanced submodule, for being protected according to the last time after the battery pack enters dynamic operation condition by the static operating condition
The equalization information deposited, it is balanced to needing balanced single battery to carry out in the battery pack.
9. device according to claim 6, which is characterized in that described device further include:
Second determining module, for determining the load voltage values for needing balanced single battery；
Detection module, for detecting whether the load voltage values for needing balanced single battery are less than stopping trimming threshold；
Stopping modular stops equilibrium for being less than the single battery for stopping trimming threshold to load voltage values.
10. a kind of vehicle characterized by comprising
Battery pack and the battery balanced device as described in claim 6-9, the battery balanced device and the battery pack phase
Even.
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| CN201710736489.2A CN110015181B (en) | 2017-08-24 | 2017-08-24 | Battery equalization method and device and vehicle |
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| CN114103729A (en) * | 2020-08-27 | 2022-03-01 | 比亚迪股份有限公司 | Method and device for balancing battery pack and electric automobile |
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| CN110015181B (en) | 2021-01-12 |
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