CN109494850A - Battery pack equilibrium method, apparatus and system - Google Patents
Battery pack equilibrium method, apparatus and system Download PDFInfo
- Publication number
- CN109494850A CN109494850A CN201910016201.3A CN201910016201A CN109494850A CN 109494850 A CN109494850 A CN 109494850A CN 201910016201 A CN201910016201 A CN 201910016201A CN 109494850 A CN109494850 A CN 109494850A
- Authority
- CN
- China
- Prior art keywords
- battery
- battery pack
- single battery
- equalized
- equilibrium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 203
- 230000008569 process Effects 0.000 claims abstract description 112
- 238000007600 charging Methods 0.000 claims abstract description 100
- 230000005611 electricity Effects 0.000 claims description 24
- 239000000178 monomer Substances 0.000 claims description 24
- 238000005303 weighing Methods 0.000 description 15
- 238000003860 storage Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 239000005955 Ferric phosphate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229940032958 ferric phosphate Drugs 0.000 description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 4
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of battery pack equilibrium methods, apparatus and system, are related to power battery field.The battery pack can be divided into multiple sub- battery packs, in battery pack charging process, when detecting that battery pack meets equilibrium condition, it can be in the discharge process after the charging process of the battery pack, the battery pack charging complete and during at least one of charging process next time of the battery pack, equilibrium is carried out to all or part single battery to be equalized in N number of single battery to be equalized, and the quantity by balanced single battery for including in every sub- battery pack is respectively less than or is equal to amount threshold.As a result, in the balancing procedure of battery pack, can to avoid because balanced single battery it is excessive, cause balanced circuit to be burnt.Also, equilibrium can be carried out to battery pack in the entire charging process of battery pack and in discharge process using method provided by the invention, effectively increase equalization efficiency.
Description
Technical field
The present invention relates to power battery field, in particular to a kind of battery pack equilibrium method, device and battery pack balancing
System.
Background technique
Electric car in use, needs battery pack to provide energy for it.Battery pack generally comprises more piece monomer electricity
Pond, but the single battery of same batch production, the performance parameters such as internal resistance, capacity and self-discharge rate difference, and with
The increase of cycle charge-discharge number, the capacity volume variance between single battery can be more and more significant, seriously affects the service life of battery pack.
Therefore, need to carry out battery pack in charge and discharge process it is balanced, to reduce the capacity volume variance because of each single battery caused by electricity
The capacity of pond group is unbalance.
In the related technology, in order to which the capacity to single battery each in battery pack carries out balanced each monomer in battery pack
Battery can connect a resistance and one switch.When the switch is closed, the part electric energy of single battery can be converted into resistance
Thermal energy, be achieved in the equilibrium of the capacity to single battery each in battery pack.
But in the balancing procedure, each resistance can heat up because of thermal dissipation, cause the resistance value of resistance to reduce,
The euqalizing current in weighing apparatus circuit increases, and then balanced circuit is caused to be burnt because electric current is excessive.
Summary of the invention
The embodiment of the invention provides a kind of battery pack equilibrium method, device and systems, can solve the relevant technologies
Because euqalizing current it is excessively high caused by balanced circuit burn the problem of.The technical solution is as follows:
On the one hand, a kind of battery pack equilibrium method is provided, the battery pack includes M single battery, the M monomer
Battery is divided into multiple sub- battery packs, and each sub- battery pack includes concatenated multiple single batteries, wherein M is greater than 1
Positive integer；The described method includes:
In the battery pack charging process, according to the voltage difference of the M single battery, whether the battery pack is judged
Meet equilibrium condition；
When the battery pack meets equilibrium condition, determination is N number of to equal from the M single battery that the battery pack includes
Weigh single battery, and the voltage of each single battery to be equalized is all larger than the voltage of remaining single battery, the N be less than
Or the positive integer equal to M/2；
In balancing procedure, all or part single battery to be equalized in N number of single battery to be equalized is carried out
Equilibrium, and in each sub- battery pack amount threshold is respectively less than or is equal to by the quantity of balanced single battery, wherein it is described
Balancing procedure includes this charging process, the discharge process after the battery pack this charging complete and institute of the battery pack
State at least one process in the charging process next time of battery pack.
Optionally, described in the battery pack charging process, according to the voltage difference of the M single battery, judge institute
State whether battery pack meets equilibrium condition, comprising:
In the battery pack charging process, the voltage of each single battery is obtained；
When the maximum value of the voltage of the M single battery is greater than first voltage threshold value, the M single battery is determined
Voltage difference；
When the voltage difference is in difference range, the capacity difference of the M single battery is determined；
When the capacity difference is greater than capacity difference threshold value, determine that the battery pack meets the equilibrium condition；
When the capacity difference is less than or equal to capacity difference threshold value, determine that the battery pack is unsatisfactory for the equilibrium condition.
Optionally, in the voltage difference according to the M single battery, judge whether the battery pack meets balanced item
After part, the method also includes:
When the battery pack meets the equilibrium condition, first identifier is set by the balanced mark；
When the battery pack is unsatisfactory for the equilibrium condition, second identifier is set by the balanced mark；
It is described in balancing procedure, to all or part single battery to be equalized in N number of single battery to be equalized
It carries out balanced, comprising:
The equilibrium is detected to identify whether as the first identifier；
When the equilibrium of the battery pack is identified as the first identifier, to complete in N number of single battery to be equalized
Portion or the part single battery to be equalized carry out balanced.
Optionally, after determining N number of single battery to be equalized in the M single battery that the battery pack includes, institute
State method further include:
Record the battery label of each single battery to be equalized in N number of single battery to be equalized；
It is described in balancing procedure, to all or part single battery to be equalized in N number of single battery to be equalized
It carries out balanced, comprising:
In balancing procedure, according to the battery label of the single battery to be equalized of record, to all or part of described to equal
The single battery that weighs carries out balanced.
Optionally, the balancing procedure be the battery pack this charging process and/or the battery pack next time
Charging process is carrying out balanced process to all or part single battery to be equalized in N number of single battery to be equalized
In, the method also includes:
When the voltage of the single battery each in the M single battery is all larger than the first voltage threshold value, stop
Only the single battery to be equalized is carried out balanced；
Second identifier is set by the balanced mark, and removes the battery mark of the single battery to be equalized recorded
Number.
Optionally, the balancing procedure is the discharge process after this charging complete of the battery pack, described to described N number of
All or part single battery to be equalized in single battery to be equalized carries out balanced, comprising:
When the minimum value of the voltage of the M single battery is greater than second voltage threshold value, to N number of monomer to be equalized
All or part single battery to be equalized in battery carries out balanced；
The method also includes:
When the minimum value of the voltage of the M single battery is less than second voltage threshold value, stop to the list to be equalized
Body battery carries out balanced.
Optionally, after judging whether the battery pack meets equilibrium condition, the method also includes:
When the battery pack is unsatisfactory for equilibrium condition, the battery mark of the single battery to be equalized recorded is removed
Number.
On the other hand, a kind of battery pack balancing device is provided, the battery pack includes M single battery, and described M single
Body battery is divided into multiple sub- battery packs, and each sub- battery pack includes concatenated multiple single batteries, wherein M is greater than 1
Positive integer；Described device includes:
Judgment module, for according to the voltage difference of the M single battery, judging in the battery pack charging process
Whether the battery pack meets equilibrium condition；
Determining module, the M single battery for including from the battery pack when the battery pack meets equilibrium condition
The voltage of the middle N number of single battery to be equalized of determination, each single battery to be equalized is all larger than the voltage of residual monomer battery,
The N is the positive integer less than or equal to M/2；
Balance module is used in balancing procedure, to be equalized to all or part in N number of single battery to be equalized
Single battery carries out equilibrium, and is respectively less than or is equal to quantity threshold by the quantity of balanced single battery in each sub- battery pack
Value, wherein the balancing procedure include the battery pack this charging process, putting after the battery pack this charging complete
At least one process in the charging process next time of electric process and the battery pack.
Optionally, the judgment module, comprising:
Acquisition submodule, for obtaining the voltage of each single battery in the battery pack charging process；
First determines submodule, for when the maximum value of the voltage of the M single battery is greater than first voltage threshold value,
Determine the voltage difference of the M single battery；
Second determines submodule, for determining the M single battery when the voltage difference is in difference range
Capacity difference；
Third determines submodule, for determining that the battery pack meets institute when the capacity difference is greater than capacity difference threshold value
State equilibrium condition；When the capacity difference is less than or equal to capacity difference threshold value, determine that the battery pack is unsatisfactory for the balanced item
Part.
Optionally, described device further include:
Setup module, for judging the battery according to the voltage difference of the M single battery in the judgment module
After whether group meets equilibrium condition, when the battery pack meets the equilibrium condition, the is set by the balanced mark
One mark；And when the battery pack is unsatisfactory for the equilibrium condition, second identifier is set by the balanced mark；
The balance module, is used for:
The equilibrium is detected to identify whether as the first identifier；
When the equilibrium of the battery pack is identified as the first identifier, to complete in N number of single battery to be equalized
Portion or the part single battery to be equalized carry out balanced.
Optionally, described device further include:
Logging modle, for determination to be N number of to equal from the M single battery that the battery pack includes in the determining module
It weighs after single battery, records the battery label of each single battery to be equalized in N number of single battery to be equalized；
The balance module, is used for:
In balancing procedure, according to the battery label of the single battery to be equalized of record, to all or part of described to equal
The single battery that weighs carries out balanced.
Optionally, the balancing procedure be the battery pack this charging process and/or the battery pack next time
Charging process, the balance module are also used to:
When the voltage of the single battery each in the M single battery is all larger than the first voltage threshold value, stop
Only the single battery to be equalized is carried out balanced；
The setup module is also used to set second identifier for the balanced mark, and remove recorded it is described to
The battery label of balanced single battery.
Optionally, the balancing procedure be this charging complete of the battery pack after discharge process, the balance module,
For:
When the minimum value of the voltage of the M single battery is greater than second voltage threshold value, to N number of monomer to be equalized
All or part single battery to be equalized in battery carries out balanced；
When the minimum value of the voltage of the M single battery is less than second voltage threshold value, stop to the list to be equalized
Body battery carries out balanced.
Optionally, the logging modle is also used to: judging whether the battery pack meets balanced item in the judgment module
After part, when the battery pack is unsatisfactory for equilibrium condition, the battery label of the single battery to be equalized recorded is removed.
Another aspect, provides a kind of battery pack balancing device, and described device includes: processing component, memory and deposits
The computer program that can be run on the memory and on the processing component is stored up, the processing component executes the calculating
The battery pack equilibrium method as described in terms of above-mentioned is realized when machine program.
In another aspect, providing a kind of computer readable storage medium, it is stored in the computer readable storage medium
Instruction, when the computer readable storage medium is run on computers, so that computer is executed as described in terms of above-mentioned
Battery pack equilibrium method.
In another aspect, provide a kind of battery pack balancing system, the system comprises: battery pack, as described in terms of above-mentioned
Battery pack balancing device, M resistance and M switch, the battery pack includes M single battery, the M single battery
It corresponds with the M resistance, and is corresponded with the M switch, the M is the positive integer greater than 1, and the M is big
In 1 positive integer；
Each resistance is connected with corresponding one switch, the resistance and the switch after series connection with it is corresponding
The single battery it is in parallel, form a balanced circuit；
Each switch is connect with the battery pack balancing device, and the battery pack balancing device is for controlling each institute
State the closing or opening of switch.
Optionally, the battery pack balancing device, the M resistance and the M switch integrate on circuit boards,
The system also includes: the temperature sensor being integrated on the circuit board；
The temperature sensor is used to detect the temperature of the circuit board；
The battery pack balancing device is connect with the temperature sensor, is also used to be controlled according to the temperature each described
The open and close of switch.
Technical solution bring beneficial effect provided by the invention includes at least:
The present invention provides a kind of battery pack equilibrium method, apparatus and system, which can be divided into multiple son electricity
Pond group.It, can be in the charging of the battery pack when detecting that battery pack meets equilibrium condition in battery pack charging process
Discharge process after journey, the battery pack charging complete and at least one process in the charging process next time of the battery pack
In, equilibrium is carried out to all or part single battery to be equalized in N number of single battery to be equalized, and in every sub- battery pack
Including the quantity by balanced single battery be respectively less than or be equal to amount threshold.It, can as a result, in the balancing procedure of battery pack
It is excessive to avoid the single battery because of equilibrium, and cause temperature excessively high, balanced circuit is burnt.Also, using provided by the invention
Method can carry out equilibrium to battery pack in the entire charging process of battery pack and in discharge process, when increasing equilibrium
Between, effectively increase equalization efficiency.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of flow chart of battery pack equilibrium method provided in an embodiment of the present invention；
Fig. 2 is the flow chart of another battery pack equilibrium method provided in an embodiment of the present invention；
Fig. 3 is the flow chart for the judgment method whether a kind of battery pack provided in an embodiment of the present invention meets equilibrium condition；
Fig. 4 is the flow chart of the battery pack equilibrium method in a kind of charging process provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of battery pack balancing device provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of judgment module provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another battery pack balancing device provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Currently, with the battery technology of electric car fast development and charging pile it is universal, electric car into
Enter in average family.But the energy storage of batteries of electric automobile is always the bottleneck of Development of Electric Vehicles.Due to the limitation of production technology,
Lead to the single battery of same batch production, the performance parameters such as internal resistance, capacity and self-discharge rate are also variant, and with following
The increase of ring charge and discharge number, the capacity volume variance between single battery can be more and more significant, seriously affects the service life of battery pack.Cause
This, needs to carry out balanced management to battery pack, so that the capacity of the single battery of the battery pack is consistent.
In the related technology, the mode for generalling use passive equilibrium carries out equilibrium to the battery pack.Generally in battery pack
An each single battery resistance (such as power resistor) in parallel and a switch, the single battery, resistance and switch can be with
Form a balanced circuit.When the switch is closed, the part electric energy of the single battery can be converted into the thermal energy of resistance, to make
The capacity of each single battery is consistent in battery pack.
But in the balancing procedure, resistance can heat up because of thermal dissipation, and the resistance value of resistance is caused to reduce, and equilibrium is returned
The euqalizing current on road increases, and burns so as to cause balanced circuit because electric current is excessive.And the temperature and primary balanced list
The number of body battery is directly proportional.That is, the number of primary balanced single battery is more, temperature can be higher.Therefore, related skill
The number of the primary balanced single battery of equalization methods in art is less, and equalization efficiency is lower.
Also, in the related technology when carrying out balanced to battery pack, only in the latter stage of charging of battery pack (battery pack charging electricity
After amount about 95%) equilibrium is carried out, time for balance is shorter, causes equalization efficiency lower.
The embodiment of the invention provides a kind of battery pack equilibrium methods, can be applied to battery pack balancing device.This method
Can solve in the related technology because euqalizing current it is excessively high caused by balanced circuit burn the problem of, and can solve the relevant technologies
In the lower problem of equalization efficiency.Also, battery pack equilibrium method provided in an embodiment of the present invention can be used for the list for including
The battery pack of the number of body battery more (such as number can be greater than or equal to 150), the battery pack can be used for for large-scale electricity
Electrical automobile provides energy.
In embodiments of the present invention, which may include M single battery, which can be divided into
Multiple sub- battery packs, every sub- battery pack may include concatenated multiple single batteries, that is to say that every sub- battery pack includes
Multiple single batteries are located at the same region.Wherein, M is the positive integer greater than 1.Exemplary, M can be greater than or equal to 150.
Optionally, can be one group with default value single battery to be grouped M single battery, remaining monomer
Battery can be divided into one group, so that M single battery is divided into multiple sub- battery packs.Exemplary, if M is 150, this is default
Numerical value is 60, then 150 single batteries can be divided into 3 sub- battery packs, the single battery which includes
Number successively are as follows: 60,60 and 30.
Referring to Fig. 1, which may include:
Step 101, in battery pack charging process, according to the voltage difference of M single battery, judge whether the battery pack full
Sufficient equilibrium condition.
Wherein, the voltage difference of the M single battery: referring in the M single battery, the electricity of the highest single battery of voltage
The difference of pressure and the voltage of the minimum single battery of voltage.The equilibrium condition can be with are as follows: it is poor that the voltage difference of M single battery is located at
It is worth in range.
Step 102, when the battery pack meets equilibrium condition, from the M single battery that the battery pack includes determination it is N number of
Single battery to be equalized.
Wherein, the voltage of each single battery to be equalized is all larger than the voltage of remaining single battery, and N is to be less than or wait
In the positive integer of M/2.It that is to say, which is the higher N number of monomer electricity of the voltage in M single battery
Pond.Optionally, which can be distributed in different sub- battery packs.
Exemplary, if M is 150, and when N=M/2, then battery pack balancing device can detect that it is equal that the battery pack meets
After weighing apparatus condition, in 150 single batteries including by the battery pack, highest 75 single batteries of voltage are determined as list to be equalized
Body battery.
Step 103, in balancing procedure, to single battery to be equalized all or part of in N number of single battery to be equalized
It carries out balanced.
The balancing procedure may include the battery pack this charging process, the electric discharge after the battery pack this charging complete
At least one process in the charging process next time of process and the battery pack.
Wherein, amount threshold is respectively less than or is equal to by the quantity of balanced single battery in every sub- battery pack.The quantity
Threshold value can be the half of the maximum value of the number for the single battery for including in each sub- battery pack.This is by balanced monomer
Battery is that battery pack balancing device is determined from the single battery to be equalized.
It, can since the quantity by balanced single battery for including in every sub- battery pack is respectively less than or is equal to amount threshold
To guarantee when carrying out balanced to battery pack, in every sub- battery pack, dissipated with this by the resistance that balanced single battery connects
The total amount of heat of hair is not too high, so as to avoid because temperature it is excessively high caused by balanced circuit electric current it is excessively high, and then can be with
The safety for guaranteeing balanced circuit, avoids balanced circuit from burning.
Also, in the case where guaranteeing that the balanced circuit in every sub- battery pack will not be burnt, battery pack balancing device can
It is balanced to be carried out to every sub- battery pack, it can the single battery to be equalized in each region to be carried out balanced.It is possible thereby to
It effectively increases by the number of balanced single battery, improves the equalization efficiency of battery pack.
In conclusion the battery pack can be divided into multiple the embodiment of the invention provides a kind of battery pack equilibrium method
Sub- battery pack.It, can be in the charging of the battery pack when detecting that battery pack meets equilibrium condition in battery pack charging process
Discharge process after process, the battery pack charging complete and at least one of charging process mistake next time in the battery pack
Cheng Zhong carries out equilibrium, and every sub- battery pack to all or part single battery to be equalized in N number of single battery to be equalized
In include the quantity by balanced single battery be respectively less than or be equal to amount threshold.As a result, in the balancing procedure of battery pack,
Can be excessive to avoid the single battery because of equilibrium, and cause temperature excessively high, balanced circuit is burnt.Also, implemented using the present invention
The method that example provides can carry out equilibrium to battery pack in the entire charging process of battery pack and in discharge process, increase
Time for balance effectively increases equalization efficiency.
Fig. 2 is the flow chart of another battery pack equilibrium method provided in an embodiment of the present invention.Referring to fig. 2, this method can
To include:
Step 201, in battery pack charging process, the equilibrium for detecting battery pack identifies whether as first identifier.
In embodiments of the present invention, battery pack balancing device can detect the equal of battery pack when battery pack charges beginning
Weighing apparatus identifies whether as first identifier.Equilibrium mark can serve to indicate that whether the battery pack needs equilibrium when charging and starting.
And when the equilibrium is identified as first identifier (such as 1), it can indicate that the battery pack needs equilibrium when charging and starting；When this
When equilibrium is identified as second identifier (such as 0), it can indicate that the battery pack is not necessarily to equilibrium when charging and starting.Wherein, the battery
The balanced mark of group can be battery pack balancing device and be obtained and stored in memory in upper primary charging process, and should
The initial marking of equilibrium mark can be second identifier.
It is exemplary, if the battery pack balancing device, in the charging process of the battery pack, detect the balanced mark of battery pack
Knowing is 1, then can determine that the battery pack needs equilibrium.If the battery pack balancing device, detects that the equilibrium is identified as 0, then may be used
To determine the battery pack without equilibrium.
When the equilibrium for detecting the battery pack is identified as first identifier, battery pack balancing device can execute step 202；
When the balanced mark for detecting the battery pack is not first identifier, battery pack can continue to charge, and the battery pack balancing
Device can execute step 203.
Step 202, the battery label according to record, to all or part of to be equalized in N number of single battery to be equalized
Single battery carries out balanced.Execute step 203.
In embodiments of the present invention, which can be a battery pack balancing device charging process on the battery pack
In, when determining that the battery pack meets equilibrium condition, the battery label of single battery to be equalized that obtains and store to memory.
And the battery label of the single battery to be equalized in every sub- battery pack can store in the same memory block of the memory
In domain.Optionally, which can be electrification erasable programmable read-only memory (electrically erasable
Programmable read-only memory, EEPROM).
Battery pack balancing device, can be first from the memory when the equilibrium for detecting the battery pack is identified as first identifier
The interior battery label for reading the single battery to be equalized in every sub- battery pack.Then, it can determine and be wrapped in every sub- battery pack
The number of the single battery to be equalized included.If the number is less than or equal to the amount threshold, can be directly according to the every of record
The battery label of a single battery to be equalized carries out equilibrium to the single battery to be equalized in every sub- battery pack, that is to say to N
Whole single battery to be equalized in a single battery to be equalized carries out equilibrium, so that M single battery in the battery pack
Capacity is consistent.
If the number is greater than amount threshold, can be according only to the monomer to be equalized of the amount threshold in the sub- battery pack
The battery label of battery carries out equilibrium to the single battery to be equalized of the amount threshold, that is to say to N number of single battery to be equalized
In part single battery to be equalized carry out it is balanced so that the capacity of M single battery in the battery pack is consistent.It is optional
, which can be the 1/2 of the number maximum value of single battery included in each sub- battery pack.The battery pack is equal
Weighing apparatus device can randomly select the single battery to be equalized of the amount threshold.
Thus, it is possible to ensure to be respectively less than or be equal to quantity by the quantity of balanced single battery in every sub- battery pack
Threshold value, and then can be to avoid because more by the number of balanced single battery during battery pack balancing, caused equilibrium is returned
The temperature on road increases, and euqalizing current increases, and balanced circuit is burnt.
Wherein, when carrying out balanced to battery pack, can by way of reducing the capacity of the higher single battery of capacity,
It is consistent the capacity of single battery each in battery pack, so as to so that the voltage of each single battery keeps one
It causes.
It is exemplary, it is assumed that M 150, N 75, the battery pack include 3 sub- battery packs, the list that every sub- battery pack includes
The number of body battery is successively are as follows: 60,60 and 30.The amount threshold is 30.Also, battery pack balancing device is remembered according in memory
The label of the single battery to be equalized of record, determines the number for the single battery to be equalized for including in 3 sub- battery packs successively are as follows:
40,20 and 15.Since the number for the single battery to be equalized for including in first sub- battery pack is greater than 30, other two sub- batteries
The number for the single battery to be equalized that group includes is respectively less than 30, therefore when carrying out balanced to battery pack, can be only to this 75
Part single battery to be equalized in single battery to be equalized carries out equilibrium, and by balanced single battery in 3 sub- battery packs
Number successively are as follows: 30,20 and 15.
If battery pack balancing device determines 3 son electricity according to the label of the single battery to be equalized recorded in memory
The number for the single battery to be equalized that Chi Zuzhong includes is successively are as follows: 28,28 and 19, then due to every sub- battery pack include to equal
The number of weighing apparatus single battery is respectively less than 30, therefore when carrying out balanced to battery pack, can be to 75 single batteries to be equalized
In whole single battery to be equalized carry out it is balanced.
Step 203, according to the voltage difference of M single battery, judge whether the battery pack meets equilibrium condition.
When the battery pack meets the equilibrium condition, which can execute step 204 and step 206；
When the battery pack is unsatisfactory for the equilibrium condition, which can execute step 205.
In embodiments of the present invention, no matter detect that equilibrium is identified as second identifier or first identifier, battery pack balancing
Device can be in the battery pack latter stage of charging (after battery pack charge capacity is about 95%), according to the electricity of the M single battery
Pressure difference, rejudges whether the battery pack meets equilibrium condition.
Referring to Fig. 3, battery pack balancing device judges whether the battery pack meets according to the voltage difference of M single battery
The process of weighing apparatus condition may include:
Step 2031, in battery pack charging process, obtain the voltage of each single battery.
In embodiments of the present invention, which can be with battery management system (battery
Management system, BMS) connection, the BMS can with the voltage of M single battery in the real-time detection battery pack, and
The multiple voltages that will test are sent to the battery pack balancing device.
Step 2032, when the maximum value of the voltage of the M single battery be greater than first voltage threshold value when, determine this M singly
The voltage difference of body battery.
In embodiments of the present invention, when battery pack meets battery pack balancing Rule of judgment, it could judge that the battery pack is
It is no to meet equilibrium condition.Wherein, battery pack balancing Rule of judgment are as follows: battery pack pressure difference is larger and battery pack in each monomer electricity
The voltage change in pond is more gentle.In the charging process of battery pack, the voltage of each single battery in battery pack, in battery pack
Early period (battery pack charge capacity is about within 20% to 95% time) rising of charging is more steady, and voltage at this time is known as monomer electricity
The platform voltage in pond, battery pack pressure difference is smaller, so battery pack is unsatisfactory for battery pack balancing Rule of judgment.In the electric discharge of battery pack
In the process, the electric current output of battery pack is larger, and the voltage change of the single battery of battery pack is violent, is also unsatisfactory for battery pack balancing
Rule of judgment.Therefore it is unable to judge accurately whether battery pack meets balanced item during battery pack charges early period and electric discharge
Part.And battery pack latter stage of charging (after battery pack charge capacity is about 95%), the pressure difference of battery pack is larger, and each monomer electricity
The voltage in pond will not acute variation.During this period, which can satisfy battery pack balancing Rule of judgment, can be with accurate judgement
Whether battery pack meets equilibrium condition.
In battery pack charging process, when the maximum value of the voltage of the M single battery is greater than first voltage threshold value, i.e.,
It can determine that the battery pack is in latter stage of charging, the battery pack meets balanced Rule of judgment at this time.Further, battery pack balancing fills
The minimum value in the voltage of the maximum value and M single battery in the voltage of the available M single battery is set, and should
The difference of maxima and minima is determined as the voltage difference of the M single battery.
Optionally, which can determine according to the type for the single battery that the battery pack includes.It is exemplary,
If the single battery that the battery pack includes is ferric phosphate lithium cell, which can be 3550 millivolts (mv).
When the single battery that the battery pack includes is ternary battery, which can be 4050mv.
It is exemplary, it is assumed that the single battery that the battery pack includes is ferric phosphate lithium cell, then the battery pack balancing device
The voltage of the M single battery can be determined when the maximum value in the voltage for detecting M single battery is greater than 3550mv
Difference.
Step 2033, when the voltage difference is in difference range, determine the capacity difference of the M single battery.
Wherein, which refers to the remaining capacity (state of charge, SOC) of each single battery.The capacity difference is
Refer to the maximum capacity of M single battery of the battery pack and the difference of minimum capacity.The capacity of each single battery can basis
Voltage and remaining capacity-open-circuit voltage (the state of charge-open circuit of corresponding single battery
Voltage, SOC-OCV) curve determination.
In embodiments of the present invention, after determining the voltage difference of the M single battery, battery pack balancing device be may determine that
Whether the voltage difference is in preset difference range.When determining that the voltage difference is in the difference range, the battery pack is equal
Weighing apparatus device can determine the M monomer according to the maximum value of the voltage of the M single battery, minimum value and SOC-OCV curve
The maximum value and minimum value of the capacity of battery, and the M single battery is determined according to the maximum value of the capacity and minimum value
Capacity difference.
In embodiments of the present invention, when the voltage difference is less than the lower limit of the difference range, battery pack balancing device can be with
Determine that the Capacity uniformity of each single battery in battery pack is preferable, it is balanced without being carried out to the battery pack, therefore can nothing
Subsequent operation need to be executed again, and battery pack can continue to charge normal.When the voltage difference is greater than the upper limit of the difference range, battery
Group balancer can determine that the battery pack has been damaged, and need replacing, therefore without executing subsequent operation again.
Optionally, which can be preset for operator.It is exemplary, it is assumed that the difference range can be
50mv to 300mv.When the battery pack balancing device detects that voltage difference is 260mv, which is greater than 50mv and is less than
300mv then may further determine that the capacity difference for determining the M single battery in difference range.Assuming that the battery pack is equal
The voltage difference that weighing apparatus device detects is 30mv, and less than the lower limit 50mv of difference range, battery pack balancing device can determine the electricity
The Capacity uniformity of pond group is preferable, and balanced without carrying out to the battery pack, no longer execution subsequent operation, battery pack can continue just
Often charging.Assuming that the voltage difference that the battery pack balancing device detects is 350mv, then battery pack balancing device can determine the electricity
Pond group has been damaged, and is needed replacing, no longer execution subsequent operation.
Step 2034, when the capacity difference be greater than capacity difference threshold value when, determine that the battery pack meets equilibrium condition.Execute step
204。
After the battery pack balancing device has determined the capacity difference of M single battery, can by the capacity difference with deposit in advance
The capacity difference threshold value of storage is made comparisons, and when determining that the capacity difference is greater than the capacity difference threshold value, it is equal can to determine that the battery pack meets
Weighing apparatus condition.
It is exemplary, it is assumed that the capacity difference threshold value is 1%, and the capacity difference that the battery pack balancing device detects is 5%, then
Since the capacity difference is greater than 1%, thus may determine that the battery pack meets equilibrium condition.
Step 2035, when the capacity difference be less than or equal to capacity difference threshold value when, determine that the battery pack is unsatisfactory for the equilibrium item
Part.Execute step 205.
When the battery pack balancing device is by the capacity difference and after pre-stored capacity difference threshold value comparison, when determining the capacity
When difference is less than or equal to the capacity difference threshold value, that is, it can determine that the battery pack is unsatisfactory for equilibrium condition.
It is exemplary, it is assumed that the capacity difference threshold value is 1%, and the capacity difference of the battery pack of battery pack balancing device determination
It is 0.5%, then due to 0.5% < 1%, thus may determine that the battery pack meets unbalanced condition.
Equilibrium mark is set the first identifier by step 204.
It in embodiments of the present invention, can will be balanced if battery pack balancing device determines that the battery pack meets equilibrium condition
Mark is set as first identifier, in balancing procedure, to indicate that the battery pack needs equilibrium.
Exemplary, which can be 1.That is, being somebody's turn to do in battery pack latter stage of charging if battery pack balancing device determines
When battery pack meets equilibrium condition, 1 can be set by equilibrium mark.
Step 205 sets second identifier for equilibrium mark, and removes the battery of the single battery to be equalized recorded
Label.
It in embodiments of the present invention, can will be equal if battery pack balancing device determines that the battery pack is unsatisfactory for equilibrium condition
The battery label for the single battery to be equalized that weighing apparatus mark is set as second identifier, and has recorded before can removing.Wherein, should
The battery label of the single battery to be equalized recorded can be balanced in the battery pack last time charging process, to judge to meet
After condition, the battery label of the single battery to be equalized according to determined by the voltage of each single battery.
By setting second identifier for equilibrium mark, can in order in the battery pack charging process or discharge process,
Indicate the battery pack without equilibrium.By removing the battery label of single battery to be equalized recorded, can to avoid with it is subsequent
The battery label of the single battery to be equalized of required record causes to obscure.
It is exemplary, it is assumed that when battery pack balancing device detects that battery pack is unsatisfactory for equilibrium condition, to be recorded in memory
Equilibrium be identified as 1, and record has the battery label of 75 single batteries to be equalized, then battery pack balancing device can be by this
Weighing apparatus mark is set as 0, and removes the battery label of 75 single batteries to be equalized recorded.
It should be noted that if n-th latter stage of charging of the battery pack balancing device in battery pack, which is identified and is arranged
For first identifier.Then battery pack balancing device can carry out the battery pack balanced when (n+1)th charging of battery pack starts.And
If the battery pack, in (n+1)th charging process, not up to balanced Rule of judgment, then balanced mark remains first identifier.It should
When the n-th+2 times chargings of battery pack start, battery pack balancing device still carries out the battery pack balanced.In this way, if subsequent each
During the charging process, not up to balanced Rule of judgment, battery balanced device can fill every time battery pack in the subsequent of the battery pack
Persistently the battery pack is carried out in electric process and in electric discharge balanced.It is thereby possible to the consistency that will lead to battery pack is deteriorated, and
And balanced circuit can be damaged.
Therefore, in embodiments of the present invention, when the battery pack balancing device detects that the battery pack charged at continuous m times
Cheng Zhong, the maximum value of the voltage of M single battery in the battery pack is respectively less than first voltage threshold value every time, can determine battery
Group continuous m time not up to balanced Rule of judgment, then set second identifier for balanced identify, and battery pack balancing device can be at this time
Second identifier is set by equilibrium mark, and removes the label of the single battery to be equalized recorded.To avoid in the battery
During group subsequent charge, balanced circuit damage, so as to ensure the reliability in balanced circuit.Wherein, m can be for greater than 3
Positive integer, such as m can be equal to 4.
Step 206 determines N number of single battery to be equalized from the M single battery that the battery pack includes.
Wherein, the voltage of each single battery to be equalized is all larger than the voltage of remaining single battery, N be less than or equal to
The positive integer of M/2, such as N can be equal to M/2.
In embodiments of the present invention, which, can be by M after setting first identifier for equilibrium mark
The voltage of a single battery is ranked up by sequence from high to low, and the higher N number of battery of voltage is determined as to equal
Weigh single battery.
It is exemplary, it is assumed that the number M for the single battery for including in battery pack is 150, and when N=M/2, then battery pack balancing
After device can meet equilibrium condition detecting the battery pack, in 150 single batteries including by the battery pack, voltage is most
75 high single batteries are determined as single battery to be equalized.
Step 207, the battery label for recording each single battery to be equalized in N number of single battery to be equalized.
In embodiments of the present invention, each single battery in the battery pack is previously provided with a corresponding battery mark
Number.The battery pack balancing device is after determining the battery to be equalized, the label of available each single battery to be equalized, and
The label of each single battery to be equalized is stored to memory.
It is exemplary, it is assumed that the battery pack is divided into 3 sub- battery packs by battery pack balancing device, and determined 75 to
Balanced single battery.If the number for the single battery to be equalized for including in every sub- battery pack respectively is: 40,25 and 5.Then
Battery pack balancing device can be stored in storage respectively by the battery label of the single battery to be equalized in every sub- battery pack
In the same storage region of device, such as 40 single batteries to be equalized in first sub- battery pack can be stored in storage
In the same storage region of device.
Step 208, in balancing procedure, to all or part in N number of single battery to be equalized monomer to be equalized electricity
Pond carries out balanced.
Wherein, after which may include this charging process of the battery pack, the battery pack this charging complete
Discharge process and/or at least one process in the charging process next time of the battery pack.This is by balanced monomer electricity
Pond can be all or part of single battery in N number of single battery to be equalized.
The realization process of step 208 can refer to the realization process of above-mentioned steps 201 and step 202, the embodiment of the present invention
It repeats no more.
It should be noted that referring to fig. 4, when this charging process and/or the battery that the balancing procedure is the battery pack
When the charging process next time of group, the battery pack balancing device is to all or part of to equal in N number of single battery to be equalized
When the single battery that weighs carries out balanced, this method can also include:
Step 209, when the voltage of single battery each in M single battery is all larger than first voltage threshold value, stop pair
Single battery to be equalized carries out balanced.
In embodiments of the present invention, which can obtain the M monomer electricity in balancing procedure in real time
The battery in pond.When the battery pack balancing device detects that the voltage of each single battery in the M single battery is all larger than first
When voltage threshold, it can determine that the pressure difference of battery pack is smaller, the consistency of battery pack is preferable, can stop at this time to list to be equalized
Body battery carries out balanced.
It is exemplary, it is assumed that the single battery that the battery pack includes is ferric phosphate lithium cell, then the first voltage threshold value can
Think 3550mv, which detects the voltage of each single battery in M single battery in balancing procedure
It is all larger than 3550mv, then battery pack balancing device can stop carrying out single battery to be equalized balanced.
Step 210 sets second identifier for equilibrium mark, and removes the battery of the single battery to be equalized recorded
Label.
When stopping to the equilibrium of the single battery to be equalized, battery pack balancing device can set equilibrium mark to the
Two marks (such as 0), and remove the battery label of the single battery to be equalized recorded.The second identifier can be indicated in the electricity
In the discharge process of pond group and next time charging process, no longer need to carry out the battery pack balanced.
Optionally, when the balancing procedure is the discharge process of battery pack, battery pack balancing device is detecting balanced mark
When knowledge is first identifier, before carrying out equilibrium to single battery to be equalized, the voltage of the M single battery can also be judged
Whether minimum value is greater than second voltage threshold value, and can be greater than second voltage in the minimum value of the voltage of the M single battery
When threshold value, then each single battery to be equalized is carried out balanced.
Optionally, which can determine according to the type of the battery pack.It is exemplary, if in the battery pack
Each single battery is ferric phosphate lithium cell, then the second voltage threshold value can be 2900mv.If each list in the battery pack
Body battery is ternary battery, then the second voltage threshold value can be 3300mv.
Exemplary, if the first identifier is 1, which is 2900mv, it is assumed that battery pack balancing device inspection
It measures the equilibrium to be identified as after 1, detects that the minimum value of the voltage of the M single battery is 3000mv, be greater than second voltage
Threshold value 2900mv then starts to carry out the battery pack balanced.
In embodiments of the present invention, the capacity of each single battery in discharge process can be gradually reduced, correspondingly, each
The voltage of single battery can be also gradually reduced.Therefore, minimum of the battery pack balancing device in the voltage for detecting M single battery
When value is greater than second voltage threshold value, i.e., equilibrium is carried out to the battery pack, to ensure the battery pack each monomer during discharge
The capacity of battery is consistent.
In embodiments of the present invention, when carrying out balanced to the battery pack in the discharge process in battery pack, battery pack is equal
Weighing apparatus device can continue to test the voltage of each single battery, and can be less than in the minimum value of the voltage of the M single battery
When second voltage threshold value, stop carrying out single battery to be equalized balanced.
In embodiments of the present invention, when the minimum value of the voltage of M single battery is less than second voltage threshold value, if continuing
Equilibrium is carried out to the battery pack, equilibrium may be carried out to the lower single battery of capacity, to exacerbate the list in battery pack
The inconsistency of the capacity of body battery, and may be damaged the battery pack.Therefore battery pack balancing device is in battery power discharge
During when carrying out equilibrium to it, when detecting that the minimum value of voltage of M single battery is less than second voltage threshold value, need
Stop equilibrium.
It is exemplary, it is assumed that the second voltage threshold value be 2900mv, then during the battery power discharge to the battery pack into
When row is balanced, when the minimum value of the voltage for the M single battery that the battery pack balancing device detects is less than second voltage threshold value
When 2900mv, the balancing procedure can be stopped.
It should be noted that battery pack balancing device can not identify the equilibrium after stopping equilibrium during discharge
Modify, it can keep the equilibrium to be identified as first identifier, in order to the battery pack next time charge start when, Ke Yiji
It is continuous that equilibrium is carried out to the battery pack, to improve equalization efficiency.
In embodiments of the present invention, in the balancing procedure of the battery pack, which can also supervise in real time
The state for surveying each balanced circuit, when the battery pack balancing device detects electricity in the balanced circuit by balanced single battery
When stream is 0 namely the equilibrium loop open circuit, i.e., capable of emitting warning information, prompt operator equilibrium circuit there are failure, with
Convenient for operator's on-call maintenance.
In conclusion the battery pack can be divided into multiple the embodiment of the invention provides a kind of battery pack equilibrium method
Sub- battery pack.It, can be in the charging of the battery pack when detecting that battery pack meets equilibrium condition in battery pack charging process
Discharge process after process, the battery pack charging complete and at least one of charging process mistake next time in the battery pack
Cheng Zhong carries out equilibrium, and every sub- battery pack to all or part single battery to be equalized in N number of single battery to be equalized
In include the quantity by balanced single battery be respectively less than or be equal to amount threshold.As a result, in the balancing procedure of battery pack,
Can be excessive to avoid the single battery because of equilibrium, and cause temperature excessively high, balanced circuit is burnt.Also, implemented using the present invention
The method that example provides can carry out equilibrium to battery pack in the entire charging process of battery pack and in discharge process, increase
Time for balance effectively increases equalization efficiency.
The embodiment of the invention provides a kind of battery pack balancing device, which may include M single battery, the M
A single battery is divided into multiple sub- battery packs, and every sub- battery pack includes concatenated multiple single batteries, wherein M is greater than 1
Positive integer.Referring to Fig. 5, the apparatus may include:
Judgment module 301, in the battery pack charging process, according to the voltage difference of the M single battery, judgement should
Whether battery pack meets equilibrium condition.
Determining module 302, the M single battery for including from the battery pack when the battery pack meets equilibrium condition
The middle N number of single battery to be equalized of determination, the voltage of each single battery to be equalized are all larger than the voltage of residual monomer battery, the N
For the positive integer less than or equal to M/2.
Balance module 303 is used in balancing procedure, to be equalized to all or part in N number of single battery to be equalized
Single battery carries out equilibrium, and is respectively less than or is equal to amount threshold by the quantity of balanced single battery in every sub- battery pack,
Wherein, the balancing procedure may include battery pack this charging process, the discharge process after battery pack this charging complete with
And at least one process in the charging process next time of battery pack.
Optionally, the judgment module 301 may include:
Acquisition submodule 3011, for obtaining the voltage of each single battery in the battery pack charging process.
First determines submodule 3012, and the maximum value for the voltage when the M single battery is greater than first voltage threshold value
When, determine the voltage difference of the M single battery.
Second determines submodule 3013, for determining the M single battery when the voltage difference is in difference range
Capacity difference.
Third determines submodule 3014, is somebody's turn to do for when the capacity difference is greater than capacity difference threshold value, determining that the battery pack meets
Equilibrium condition；And when the capacity difference is less than or equal to capacity difference threshold value, determine that the battery pack is unsatisfactory for the equilibrium condition.
Optionally, referring to Fig. 5, which can also include: setup module 304, be used in judgment module 301, according to the M
The voltage difference of a single battery, after judging whether the battery pack meets equilibrium condition,
When the battery pack meets the equilibrium condition, first identifier is set by equilibrium mark；And work as the battery pack
When being unsatisfactory for the equilibrium condition, second identifier is set by equilibrium mark.
The balance module 303, can be used for:
The equilibrium is detected to identify whether as the first identifier.
When the equilibrium of the battery pack is identified as the first identifier, in N number of single battery to be equalized whole or portion
The single battery to be equalized is divided to carry out balanced.
Optionally, as shown in figure 5, the device further include: logging modle 305, in determining module 302 from the battery pack
Including M single battery in determine N number of single battery to be equalized after, record in N number of single battery to be equalized each to
The battery label of balanced single battery.
The balance module 303, can be used for:
In balancing procedure, according to the battery label of the single battery to be equalized of record, to all or part, this is to be equalized
Single battery carries out balanced.
Optionally, the balancing procedure be the battery pack this charging process and/or the battery pack charged next time
Journey, the balance module 303 can be also used for:
When the voltage of each single battery in the M single battery is all larger than the first voltage threshold value, stopping waits for this
Balanced single battery carries out balanced.
The setup module 304, is also used to identify the equilibrium and is set as second identifier, and it is to be equalized to remove this that recorded
The battery label of single battery.
Optionally, which is the discharge process after this charging complete of the battery pack.The balance module 303, can
To be used for:
When the minimum value of the voltage of the M single battery is greater than second voltage threshold value, to N number of single battery to be equalized
In all or part single battery to be equalized carry out it is balanced.
When the minimum value of the voltage of the M single battery is less than second voltage threshold value, stop to the monomer electricity to be equalized
Pond carries out balanced.
Optionally, which can be also used for: judge whether the battery pack meets in the judgment module 301
After weighing apparatus condition, when the battery pack is unsatisfactory for equilibrium condition, the battery label of the single battery to be equalized recorded is removed.
In conclusion the battery pack can be divided into multiple the embodiment of the invention provides a kind of battery pack balancing device
Sub- battery pack.In battery pack charging process, when battery pack balancing device detects that battery pack meets equilibrium condition, Ji Ke
Discharge process after the charging process of the battery pack, the battery pack charging complete and the charging process next time in the battery pack
At least one of during, all or part in N number of single battery to be equalized single battery to be equalized is carried out it is balanced,
And the quantity by balanced single battery in every sub- battery pack including is respectively less than or is equal to amount threshold.As a result, to battery
, can be excessive to avoid the single battery because of equilibrium in the balancing procedure of group, and cause temperature excessively high, balanced circuit is burnt.Also,
It can be in the entire charging process of battery pack and in discharge process to battery pack using device provided in an embodiment of the present invention
Equilibrium is carried out, time for balance is increased, effectively increases equalization efficiency.
It is apparent to those skilled in the art that for convenience and simplicity of description, the device of foregoing description,
The specific work process of each module and each submodule, can refer to corresponding processes in the foregoing method embodiment, herein no longer
It repeats.
Fig. 7 is the structural schematic diagram of another battery pack balancing device provided in an embodiment of the present invention.Referring to Fig. 7, the dress
Setting may include: processing component 401, memory 402 and is stored on the memory 402 and can be on the processing component 401
The computer program 4021 of operation, the processing component 401 are realized as shown in Figures 1 to 4 when executing the computer program 4021
Battery pack equilibrium method.
The embodiment of the invention also provides a kind of computer readable storage medium, stored in the computer readable storage medium
There is instruction, when the computer readable storage medium is run on computers, so that computer executes as shown in Figures 1 to 4
Battery pack equilibrium method.
The embodiment of the invention also provides a kind of battery pack balancing system, which be can be applied in electric car.It should
System may include: battery pack, battery pack balancing device (such as Fig. 5 or device shown in Fig. 7) provided by above-described embodiment,
M resistance and M switch, which includes M single battery, and the M single battery and the M resistance correspond,
And corresponded with this M switch, M is the positive integer greater than 1.
Each resistance is connected with a corresponding switch, and the resistance and switch after series connection can be with a corresponding monomer electricity
Pond is in parallel, forms a balanced circuit.Each switch can be connect with the battery pack balancing device, which uses
In the closing or opening for controlling each switch.Optionally, which can be Metal-Oxide Semiconductor field effect transistor
(metal-oxide-semiconductor field-effect transistor, MOSFET).
In embodiments of the present invention, in the discharge process of battery pack charging process or the battery pack, when the battery pack is equal
Weighing apparatus device detects that equilibrium is identified as first identifier, i.e., it is controllable in N number of single battery to be equalized it is all or part of to
The connection of balanced single battery closes the switch, so as to pass through so that the balanced circuit of corresponding single battery to be equalized is connected
The electric energy of single battery to be equalized is converted to thermal energy by resistance, and then realizes the equilibrium to the battery pack, makes the M single battery
Capacity be consistent.
Also, in balancing procedure, if the battery pack balancing device detects that the voltage of M single battery is all larger than first
Voltage threshold can control and disconnect with each switch connected by balanced single battery, stops the equilibrium to the battery pack.
Optionally, the battery pack balancing device, the M resistance and this M switch can integrate on circuit boards, should
System can also include: integrated temperature sensor on the board.The temperature sensor can be used for detecting the circuit board
Temperature.The battery pack balancing device is connect with the temperature sensor, can be also used for controlling each switch according to the temperature
Open and close.
In embodiments of the present invention, when carrying out balanced to the battery pack, the thermal energy of the resistance in balanced circuit can be transmitted
To circuit board, temperature sensor can be produced by the temperature of real-time detection circuit plate, the resistance that can be obtained in balanced circuit
Raw thermal energy.Temperature that battery pack balancing device can obtain more in real time and pre-stored temperature threshold, judge whether after
It is continuous that equilibrium is carried out to the battery pack:
When battery pack balancing device determine the temperature be greater than temperature threshold when, then disconnect it is all with by balanced single battery
Connection switch, stop equilibrium to the battery pack, it is excessively high to avoid temperature, cause euqalizing current to be greater than current threshold,
Weighing apparatus circuit is burnt, to ensure the security reliability in the equilibrium circuit.
When battery pack balancing device determines that the temperature is less than temperature threshold, then continue to carry out the battery pack balanced.This
When, the euqalizing current in the battery pack balancing circuit is smaller, can be less than current threshold.
Optionally, which can be 100 milliamperes (mA), which can be 65 degrees Celsius (DEG C).Example
, it is assumed that the battery pack balancing device detects that the temperature of the circuit board is 68 DEG C, since the temperature is greater than 65 DEG C of temperature threshold
When, then it disconnects all with by the switch of the connection of balanced single battery, stops the equilibrium to the battery pack.Assuming that the battery pack
Balancer detects that the temperature of the circuit board is 40 DEG C, when being less than 65 DEG C of temperature threshold due to 40 DEG C, then continues to the battery
Group carries out balanced.At this point, the euqalizing current in the battery pack balancing circuit can be less than 100mA.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely exemplary embodiment of the present invention, are not intended to limit the invention, all in spirit of the invention
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of battery pack equilibrium method, which is characterized in that the battery pack includes M single battery, the M single battery
Multiple sub- battery packs are divided into, each sub- battery pack includes concatenated multiple single batteries, wherein M is just whole greater than 1
Number；The described method includes:
In the battery pack charging process, according to the voltage difference of the M single battery, judge whether the battery pack meets
Equilibrium condition；
When the battery pack meets equilibrium condition, N number of list to be equalized is determined from the M single battery that the battery pack includes
Body battery, the voltage of each single battery to be equalized are all larger than the voltage of remaining single battery, and the N is to be less than or wait
In the positive integer of M/2；
In balancing procedure, equilibrium is carried out to all or part single battery to be equalized in N number of single battery to be equalized,
And amount threshold is respectively less than or is equal to by the quantity of balanced single battery in each sub- battery pack, wherein the equilibrium
Process include the battery pack this charging process, discharge process and the electricity after the battery pack this charging complete
At least one process in the charging process next time of pond group.
2. the method according to claim 1, wherein described in the battery pack charging process, according to the M
The voltage difference of a single battery, judges whether the battery pack meets equilibrium condition, comprising:
In the battery pack charging process, the voltage of each single battery is obtained；
When the maximum value of the voltage of the M single battery is greater than first voltage threshold value, the electricity of the M single battery is determined
Pressure difference；
When the voltage difference is in difference range, the capacity difference of the M single battery is determined；
When the capacity difference is greater than capacity difference threshold value, determine that the battery pack meets the equilibrium condition；
When the capacity difference is less than or equal to capacity difference threshold value, determine that the battery pack is unsatisfactory for the equilibrium condition.
3. method according to claim 1 or 2, which is characterized in that in the voltage according to the M single battery
Difference, after judging whether the battery pack meets equilibrium condition, the method also includes:
When the battery pack meets the equilibrium condition, first identifier is set by the balanced mark；
When the battery pack is unsatisfactory for the equilibrium condition, second identifier is set by the balanced mark；
It is described in balancing procedure, all or part in N number of single battery to be equalized single battery to be equalized is carried out
It is balanced, comprising:
The equilibrium is detected to identify whether as the first identifier；
When the equilibrium of the battery pack is identified as the first identifier, in N number of single battery to be equalized whole or
The part single battery to be equalized carries out balanced.
4. according to the method described in claim 3, it is characterized in that, true from the M single battery that the battery pack includes
After fixed N number of single battery to be equalized, the method also includes:
Record the battery label of each single battery to be equalized in N number of single battery to be equalized；
It is described in balancing procedure, all or part in N number of single battery to be equalized single battery to be equalized is carried out
It is balanced, comprising:
In balancing procedure, according to the battery label of the single battery to be equalized of record, to all or part of list to be equalized
Body battery carries out balanced.
5. according to the method described in claim 4, it is characterized in that, the balancing procedure is this charging of the battery pack
The charging process next time of journey and/or the battery pack, to all or part of to equal in N number of single battery to be equalized
During the single battery that weighs carries out equilibrium, the method also includes:
When the voltage of the single battery each in the M single battery is all larger than the first voltage threshold value, stopping pair
The single battery to be equalized carries out balanced；
Second identifier is set by the balanced mark, and removes the battery label of the single battery to be equalized recorded.
6. according to the method described in claim 4, it is characterized in that, the balancing procedure is this charging complete of the battery pack
Discharge process afterwards, all or part single battery to be equalized in N number of single battery to be equalized carry out equilibrium,
Include:
When the minimum value of the voltage of the M single battery is greater than second voltage threshold value, to N number of single battery to be equalized
In all or part single battery to be equalized carry out it is balanced；
The method also includes:
When the minimum value of the voltage of the M single battery is less than second voltage threshold value, stop to the monomer electricity to be equalized
Pond carries out balanced.
7. according to any method of claim 4 to 6, which is characterized in that judging whether the battery pack meets equilibrium
After condition, the method also includes:
When the battery pack is unsatisfactory for equilibrium condition, the battery label of the single battery to be equalized recorded is removed.
8. a kind of battery pack balancing device, which is characterized in that the battery pack includes M single battery, the M single battery
Multiple sub- battery packs are divided into, each sub- battery pack includes concatenated multiple single batteries, wherein M is just whole greater than 1
Number；Described device includes:
Judgment module, in the battery pack charging process, according to the voltage difference of the M single battery, described in judgement
Whether battery pack meets equilibrium condition；
Determining module, for when the battery pack meets equilibrium condition, from the M single battery that the battery pack includes really
Fixed N number of single battery to be equalized, the voltage of each single battery to be equalized is all larger than the voltage of residual monomer battery, described
N is the positive integer less than or equal to M/2；
Balance module is used in balancing procedure, to all or part monomer to be equalized in N number of single battery to be equalized
Battery carries out equilibrium, and is respectively less than or is equal to amount threshold by the quantity of balanced single battery in each sub- battery pack,
Wherein, the balancing procedure include the battery pack this charging process, the electric discharge after the battery pack this charging complete
At least one process in the charging process next time of process and the battery pack.
9. a kind of battery pack balancing system, which is characterized in that the system comprises: battery pack, battery as claimed in claim 8
Group balancer, M resistance and M switch, and the battery pack includes M single battery, the M single battery with it is described
M resistance corresponds, and corresponds with the M switch, and the M is the positive integer greater than 1；
Each resistance is connected with corresponding one switch, the resistance and the switch and corresponding one after series connection
A single battery is in parallel, forms a balanced circuit；
It is each it is described switch connect with the battery pack balancing device, the battery pack balancing device be used for control it is each described in open
The closing or opening of pass.
10. system according to claim 9, which is characterized in that the battery pack balancing device, the M resistance and
The M switch it is integrated on circuit boards, the system also includes the temperature sensors being integrated on the circuit board；
The temperature sensor is used to detect the temperature of the circuit board；
The battery pack balancing device is connect with the temperature sensor, is also used to control each switch according to the temperature
Open and close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016201.3A CN109494850B (en) | 2019-01-08 | 2019-01-08 | Battery pack balancing method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016201.3A CN109494850B (en) | 2019-01-08 | 2019-01-08 | Battery pack balancing method, device and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109494850A true CN109494850A (en) | 2019-03-19 |
| CN109494850B CN109494850B (en) | 2022-05-03 |
Family
ID=65714189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910016201.3A Active CN109494850B (en) | 2019-01-08 | 2019-01-08 | Battery pack balancing method, device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109494850B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110509817A (en) * | 2019-09-02 | 2019-11-29 | 广州小鹏汽车科技有限公司 | Vehicle and battery balanced control method, device |
| CN111211594A (en) * | 2020-01-02 | 2020-05-29 | 安徽锐能科技有限公司 | Power supply type balance control method, circuit and storage medium considering temperature and SOH |
| CN117013110A (en) * | 2023-08-08 | 2023-11-07 | 杭州华塑科技股份有限公司 | Battery pack equalization method and device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8461806B2 (en) * | 2007-10-15 | 2013-06-11 | O2Micro Inc | Systems and methods for cell balancing |
| CN103647332A (en) * | 2013-12-26 | 2014-03-19 | 上海航天电源技术有限责任公司 | Passive equalization control system and control method used for maintaining consistency of battery pack |
| CN103683358A (en) * | 2012-09-20 | 2014-03-26 | 株式会社理光 | Battery voltage balancing device |
| CN104377776A (en) * | 2014-11-20 | 2015-02-25 | 重庆长安汽车股份有限公司 | Efficient and passive balancing control method for lithium ion battery for electric vehicle |
| JP2016096694A (en) * | 2014-11-17 | 2016-05-26 | 株式会社東芝 | Battery monitoring method and battery monitoring device |
| CN106143159A (en) * | 2016-07-07 | 2016-11-23 | 超威电源有限公司 | There is electric automobile low-voltage power supply system and the control method thereof of battery equilibrium regulation |
| WO2018128257A1 (en) * | 2017-01-03 | 2018-07-12 | 삼성에스디아이 주식회사 | Voltage detection integrated circuit and battery management system comprising same |
-
2019
- 2019-01-08 CN CN201910016201.3A patent/CN109494850B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8461806B2 (en) * | 2007-10-15 | 2013-06-11 | O2Micro Inc | Systems and methods for cell balancing |
| CN103683358A (en) * | 2012-09-20 | 2014-03-26 | 株式会社理光 | Battery voltage balancing device |
| CN103647332A (en) * | 2013-12-26 | 2014-03-19 | 上海航天电源技术有限责任公司 | Passive equalization control system and control method used for maintaining consistency of battery pack |
| JP2016096694A (en) * | 2014-11-17 | 2016-05-26 | 株式会社東芝 | Battery monitoring method and battery monitoring device |
| CN104377776A (en) * | 2014-11-20 | 2015-02-25 | 重庆长安汽车股份有限公司 | Efficient and passive balancing control method for lithium ion battery for electric vehicle |
| CN106143159A (en) * | 2016-07-07 | 2016-11-23 | 超威电源有限公司 | There is electric automobile low-voltage power supply system and the control method thereof of battery equilibrium regulation |
| WO2018128257A1 (en) * | 2017-01-03 | 2018-07-12 | 삼성에스디아이 주식회사 | Voltage detection integrated circuit and battery management system comprising same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110509817A (en) * | 2019-09-02 | 2019-11-29 | 广州小鹏汽车科技有限公司 | Vehicle and battery balanced control method, device |
| CN110509817B (en) * | 2019-09-02 | 2021-09-03 | 广州小鹏汽车科技有限公司 | Vehicle and battery equalization control method and device |
| CN111211594A (en) * | 2020-01-02 | 2020-05-29 | 安徽锐能科技有限公司 | Power supply type balance control method, circuit and storage medium considering temperature and SOH |
| CN111211594B (en) * | 2020-01-02 | 2024-03-15 | 安徽锐能科技有限公司 | Complementary equalization control method, circuit and storage medium considering temperature and SOH |
| CN117013110A (en) * | 2023-08-08 | 2023-11-07 | 杭州华塑科技股份有限公司 | Battery pack equalization method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109494850B (en) | 2022-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108152755B (en) | Method for online quantitative diagnosis of battery micro short circuit fault | |
| CN102736031B (en) | For the method and apparatus determining the charged state of battery | |
| US9461495B2 (en) | Battery warm up system and method for warming up battery using the same | |
| CN109193050B (en) | Active equalization method and device for electric quantity among battery packs | |
| CN107492917B (en) | Electric quantity balancing method, battery management system and the power electric car of power battery | |
| KR20180122429A (en) | Power System | |
| CN109863058B (en) | Model predictive battery power limit estimation system and method | |
| JP7072607B2 (en) | Effective Battery Cell Balancing Methods and Systems Using Duty Control | |
| CN104079016B (en) | Battery pack balancing system and its balance control method | |
| CN103904721B (en) | Cell voltage equalization device and method | |
| JP6324248B2 (en) | Battery state detection device, secondary battery system, battery state detection program, battery state detection method | |
| CN109494850A (en) | Battery pack equilibrium method, apparatus and system | |
| CN110323519A (en) | Battery pack method for heating and controlling and system | |
| CN106655408B (en) | Battery pack balancing control method and control device | |
| CN104237795A (en) | Detection of Imbalance Across Multiple Battery Cells Measured by the Same Voltage Sensor | |
| CN105390759B (en) | A kind of state of electric automobile lithium battery determines method | |
| KR20090130406A (en) | System and method for cell equalization using state of charge | |
| CN113696786B (en) | Battery equalization method and system | |
| CN108206560A (en) | Battery equalization method | |
| CN102130483A (en) | Equalizing charging and discharging method for power type lithium-ion battery | |
| CN104577242A (en) | Battery pack management system and method | |
| US7612540B2 (en) | Lithium-ion battery diagnostic and prognostic techniques | |
| CN110154829B (en) | Balance control method for battery core of power battery pack and power battery system | |
| CN106340920A (en) | Control method and device of passive equalization of battery pack, battery system and vehicle | |
| CN202616826U (en) | An active balance testing device of a battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |