CN106816652B - Battery system and its starting control method - Google Patents
Battery system and its starting control method Download PDFInfo
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- CN106816652B CN106816652B CN201510855611.9A CN201510855611A CN106816652B CN 106816652 B CN106816652 B CN 106816652B CN 201510855611 A CN201510855611 A CN 201510855611A CN 106816652 B CN106816652 B CN 106816652B
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- battery pack
- voltage
- starting
- control unit
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of battery system and its starting control methods, which includes: preliminary filling unit, including preliminary filling resistance and preliminary filling relay；M relay and M diode；M battery pack, the first output end are connected after corresponding series connection with M relay with preliminary filling unit first end, and preliminary filling unit first end is connected on the first output bus, and M battery pack second output terminal is electrically connected with the second output bus；First output end of M battery pack is connected with the first end of M diode one-to-one correspondence, and the second end of M diode is connected after linking together with the second end of preliminary filling unit；M battery management unit connects one to one with M battery pack with acquisition state information；Battery control unit controls preliminary filling relay closure after electrifying startup, obtains the voltage sequence of battery pack, is successively started after the first preset time according to voltage sequence M battery pack of control.The system only uses a preliminary filling resistance and preliminary filling relay, reduces costs.
Description
Technical field
The present invention relates to battery technology field, in particular to a kind of battery system and its starting control method.
Background technique
In high voltage direct current power supply system field, lithium iron battery is more and more applied at present.To realize High voltage output, adopt
It is that multiple battery modules are used in series, each battery module is generally made of 16 string iron lithium cells, exports 48V.Current one
As have 240V system (5 battery modules series connection), 336V system (7 battery modules series connection), 480V system (10 battery modules
Series connection) etc..In addition, in order to extend the charging time of battery pack, and need for concatenated battery pack system to be together in parallel to mention
Capacity is risen, to improve output power.
Battery management system generally uses BMU (battery management unit) mono- battery module of Lai Guanli, to being managed
Battery module carry out voltage, the acquisition of temperature and Balance route etc..And all BMU are then by BCU (battery control unit)
Unified management, BMU send the data to BCU, BCU then to receive whole system data it is for statistical analysis, and issue
Various corresponding control commands realize the control to whole system.
In electrifying startup Managed Solution in the related technology, generally it can increase preliminary filling resistance at each group battery pack end in parallel
And preliminary filling relay, solve the problems, such as that electric current is excessive in circulation circuit between battery pack, also avoids simultaneously by preliminary filling resistance
The heavy current impact of capacitive load when cold start, as shown in Fig. 1.In system electrification starting, it is first closed all preliminary fillings
Relay K2 ... Kn2 (n=1 here, 2,3... indicate the preliminary filling relay serial number in n-th group battery pack, similarly hereinafter), and pass through
It crosses (such as t can be set as 1 second) after predetermined set time t, then is switched to relay K1, K11 ... Kn1 (this charged normal in succession
In, the access of K1, K11 ... Kn1 sequence is the sequence access according to battery voltage from small to large, as long as and have one group just
Normal charge relay K1 (or Kn1) access system, then can disconnect all preliminary filling relay K2, K12 ... Kn2), but
Every group of battery pack in this way will on charging normal relay a preliminary filling relay and preliminary filling resistance in parallel.
Although solving battery pack by the method for preliminary filling relay in parallel on charging normal relay and preliminary filling resistance
Between the excessive problem of electric current, the heavy current impact of capacitive load when avoiding cold start in circulation circuit.But it does so but
System cost is increased simultaneously, particularly with the system for having the parallel connection of multiple groups battery pack, preliminary filling relay and preliminary filling resistance quantity
It will be with increase.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of battery system, and the heavy current impact of capacitive load, solves battery when avoiding cold start
The excessive problem of electric current in circulation circuit between group, and a preliminary filling resistance and a preliminary filling relay have been only used in the battery system
Device thus greatly reduces cost.
Second object of the present invention is to propose a kind of starting control method of battery system.
To achieve the goals above, the battery system of first aspect present invention embodiment, comprising: preliminary filling unit, it is described pre-
Filling unit includes the preliminary filling resistance and preliminary filling relay being connected in series；M relay and M diode, wherein M is greater than 1
Integer；M battery pack, the first output end of the M battery pack and the M relay one-to-one correspondence connect after with it is described pre-
The first end for filling unit is connected, and the first end of the preliminary filling unit is connected on the first output bus, and the of the M battery pack
Two output ends are electrically connected with the second output bus；The first end of first output end of the M battery pack and the M diode
Series connection is corresponded, the second end of the M diode is connected after linking together with the second end of the preliminary filling unit；M
Battery management unit, M battery management unit and M battery pack connect one to one to acquire the state of respective battery group letter
Breath；Battery control unit, the battery control unit are communicated with the M battery management unit respectively, the battery control
Unit processed for controlling preliminary filling relay closure after the battery system electrifying startup, and to the M battery pack into
Row poll is sorted with the voltage for obtaining each battery pack, and according to the voltage of each battery pack after the first preset time
Sequence is by being controlled such that the M battery pack is successively started by voltage from as low as big sequence to the M relay.
Battery system according to an embodiment of the present invention, the heavy current impact of capacitive load when avoiding cold start solve
The excessive problem of electric current in circulation circuit between battery pack, and preliminary filling resistance has been only used in the battery system and one is pre-
Relay is filled, cost is thus greatly reduced.
To achieve the goals above, the battery system based on first aspect present invention embodiment, second aspect of the present invention are real
Apply the starting control method of the battery system of example, comprising the following steps: after the battery system electrifying startup, the battery control
Unit processed controls the preliminary filling relay closure；The battery control unit is polled the M battery pack every to obtain
The voltage of a battery pack sorts；And after the first preset time of the battery system electrifying startup, the battery control is single
Member according to the voltage of each battery pack sort by the M relay be controlled such that the M battery pack by
Voltage successively starts from as low as big sequence.
The starting control method of battery system according to an embodiment of the present invention, capacitive load is big when avoiding cold start
Rush of current solves the problems, such as that electric current is excessive in circulation circuit between battery pack, and has only used a preliminary filling in battery system
Resistance and a preliminary filling relay, thus greatly reduce cost.
Detailed description of the invention
Fig. 1 is the schematic illustration of battery system in the related technology；
Fig. 2A is the schematic diagram of battery system according to an embodiment of the invention；
Fig. 2 B is the schematic diagram of battery system in accordance with another embodiment of the present invention；
Fig. 3 is the sequence starting state diagram of battery system according to an embodiment of the invention；
Fig. 4 is the sequence starting state transition graph of battery system according to an embodiment of the invention.
Fig. 5 is the flow chart of the starting control method of battery system according to an embodiment of the invention；
Fig. 6 is the flow chart of the starting control method of battery system accord to a specific embodiment of that present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition battery system and battery system starting control method.
Fig. 2A is the schematic diagram of battery system according to an embodiment of the invention.As shown in Figure 2 A, the embodiment of the present invention
Battery system 10 include: preliminary filling unit 100, M battery pack 200, M relay (K1, K21, K31 ... KM1), two poles M
Manage (D1, D2, D3 ... DM), M battery management unit 300 and battery control unit 400.Wherein, M is the integer greater than 1.
Wherein, preliminary filling unit 100 includes the preliminary filling resistance R0 and preliminary filling relay K0 being connected in series.As shown in Fig. 2, preliminary filling
The first end of unit 100 is connected with the first output bus 11, and the second end of preliminary filling unit 100 is connected with the second output bus 12.
M battery pack, the first output end 201 of M battery pack 200 with M relay (K1, K21, K31 ... KM1) one by one
It is connected after corresponding series connection with the first end 101 of preliminary filling unit 100, the first end 101 of preliminary filling unit 100 is connected to the first output mother
On line 11, the second output terminal 202 of M battery pack 200 is electrically connected with the second output bus 12；The first of M battery pack 200 is defeated
Outlet 201 is connected with the first end of M diode (D1, D2, D3 ... DM) one-to-one correspondence, and the second end of M diode is connected to
It is connected after together with the second end 102 of preliminary filling unit 100.
In one embodiment of the invention, as shown in Figure 2 A, the first output end 201 of M battery pack 200 is that anode is defeated
Outlet, second output terminal 202 are cathode output end；First output bus 11 is anode output bus, and the second output bus 12 is
Cathode exports bus.Correspondingly, the first end for M diode being connected with the first output end 201 of M battery pack 200 is sun
Pole, the second end of M diode are cathode.
Certainly, so it is easy to understand that in another embodiment of the present invention, can also be；The first of M battery pack is defeated
Outlet is cathode output end, and second output terminal is cathode output end；First output bus is that cathode exports bus, and the second output is female
Line is anode output bus.Correspondingly, the first end for M diode being connected with the first output end 201 of M battery pack 200
For cathode, the second end of M diode is anode (no longer being illustrated herein with figure).
Compared with battery system in the related technology, in the battery system of the embodiment of the present invention, even if using multiple groups electricity
Pond group 200 is in parallel, also only needs using an a preliminary filling relay K0 and preliminary filling resistance R0, while in every group of battery pack
200 the first output end 201 respectively increases diode D1, D2 ... a DM.Although the first output end 201 of every group of battery pack 200
A diode is increased, but the cost of diode is lower than the cost of preliminary filling resistance and preliminary filling relay, to reduce
System cost.
M battery management unit 300 (BMU, Battery Management Unit), M battery management unit 300 and M
A battery pack 200 connects one to one to acquire the status information of respective battery group 200.
Specifically, battery management unit 300 is connected with the one-to-one correspondence of battery pack 200, and battery management unit 300 is for acquiring
The whole status information of respective battery group 200.
Battery control unit 400 (BCU, Battery Control Unit) respectively with each battery management unit 300 into
Row communication, battery control unit 400 are used to control preliminary filling relay K0 closure after battery system electrifying startup, and to M electricity
Pond group 200 is polled to obtain the sequence of the voltage of each battery pack 200, and according to each battery after the first preset time
Group 200 voltage sequence by M relay be controlled such that M battery pack 200 by voltage from as low as big sequence according to
Secondary starting.Wherein, the starting of battery pack 200 refers to the access of battery pack 200 first output bus 11.
Wherein, battery control unit 400 is polled M battery pack 200 and refers to: battery control unit 400 successively with M
The battery management unit 300 of a battery pack 200 is communicated to obtain the status information of M battery pack 200.
In another embodiment of the present invention, as shown in Figure 2 B, each battery pack 200 in M battery pack 200 includes
The battery module 210 of N number of series connection, N are the integer more than or equal to 1；Battery management unit 300 includes N number of sub- battery management
Unit 310, every sub- battery management unit 310 acquire the status information of a battery module 210 and with battery control unit 400
It is communicated.
By taking 336V system schema as an example, i.e., a battery pack 200 is connected by 7 battery modules 210, each battery module
210 are made of 16 string iron lithium cells again, wherein each battery core internal resistance is about 1m Ω, i.e., system battery group internal resistance total size is 112m
Ω (i.e. 16*7*1m Ω also has ignored system connecting copper bar, the internal resistances such as conducting wire among these).Battery core is able to bear maximum charge electricity
Stream is 50A.Therefore the condition of 200 access system busbar of battery pack (i.e. the condition of the starting of battery pack 200) should meet: preparation will connect
The voltage for entering (preparing starting) battery pack 200 of system busbar is less than the minimum battery voltage accessed and adds 5V (i.e.
112m Ω * 50A is approximately equal to 5V).In addition, preparing time of the battery pack 200 of access apart from upper 200 access system of a battery pack needs
Meet and is greater than predetermined time interval t1.
In one embodiment of the invention, after the first preset time battery control unit 400 according to each battery pack
200 voltage sequence obtains the smallest battery pack 200 of voltage in M battery pack 200, and controls the smallest battery pack 200 of voltage
Corresponding relay is closed so that the smallest battery pack 200 of voltage starts, while controlling preliminary filling relay K0 disconnection.
Specifically, battery control unit 400 controls preliminary filling relay K0 closure, and battery control after battery system electrifying startup
Unit 400 processed is polled M battery pack 200 to obtain the sequence of the voltage of each battery pack 200, on battery system
After electric first preset time t (for example, t is 1 second), battery control unit 400 obtains the smallest battery pack of voltage in M battery pack
200, and control the voltage corresponding relay of the smallest battery pack 200 and be closed so that the smallest battery pack starting of voltage, same to time control
Preliminary filling relay K0 processed is disconnected.
Wherein, within this period of preliminary filling relay K0 closure, since preliminary filling resistance R0 exists, cold start is avoided
When capacitive load heavy current impact, and due to increasing diode D1, D2 ... DM at every group of 200 end of battery pack, therefore can keep away again
Exempt to generate circulation between battery pack, i.e., circulation circuit is not present between battery pack 200 during this period.
Lower mask body introduction controls the process that remaining M-1 battery pack 200 starts.
In one embodiment of the invention, after the smallest battery pack 200 of voltage starts, if M battery pack 200 it
Between voltage difference be less than or equal to predetermined voltage threshold, battery control unit 400 according to battery pack 200 voltage from small to large
Sequence every the second preset time control M-1 battery pack 200 successively start.
Specifically, after control preliminary filling relay K0 is disconnected, judge whether is voltage difference between M battery pack 200
Less than or equal to predetermined voltage threshold (for example, 112m Ω * 50A is approximately equal to 5V), if the voltage difference between battery pack 200 is small
In or equal to predetermined voltage threshold, then further judge whether the time started apart from a upper battery pack 200 has reached second
Preset threshold t1 starts if it is, controlling next group of battery pack 200, circuits sequentially, until by remaining M-1 battery pack
200 successively starting finish.Wherein, the sequencing that battery pack 200 starts is voltage from small to large suitable according to battery pack 200
Sequence.
In one embodiment of the invention, after the smallest battery pack 200 of voltage starts, if M battery pack 200 it
Between voltage difference be greater than predetermined voltage threshold, when battery control unit 400 judges whether to start next battery pack 200,
In, if the time interval for starting battery pack 200 with upper one reaches third preset time, under battery control unit 400 controls
One battery pack 200 starts；If the voltage of next battery pack 200 is less than minimum battery pack in the battery pack 200 having been turned on
The sum of 200 voltages and predetermined voltage threshold and with upper one start battery pack 200 time interval reach the second preset time, electricity
Pond control unit 400 controls next battery pack 200 and starts；If there is discharge current alarm in the battery pack 200 having been turned on, electricity
Pond control unit 400 controls next battery pack 200 and starts.It is understood that next battery pack 200 refer to it is inactive
The smallest battery pack 200 of voltage in battery pack.
Specifically, after control preliminary filling relay K0 is disconnected, judge whether is voltage difference between M battery pack 200
Less than or equal to predetermined voltage threshold (for example, 112m Ω * 50A is approximately equal to 5V), if the voltage difference between battery pack 200 is big
In predetermined voltage threshold, then battery control unit 400 judges whether to start next battery pack 200, if meeting following three kinds
Situation it is any, all control starts next battery pack 200:
(1) if the voltage of next battery pack 200 is less than 200 voltage of minimum battery pack in the battery pack 200 having been turned on
With the sum of predetermined voltage threshold and the time interval that starts battery pack 200 with upper one reaches the second preset time t 1, battery control
Unit 400 processed then controls next battery pack 200 and starts.
(2) if the time interval for starting battery pack 200 with upper one reaches third preset time t 2, battery control unit
400 control next battery pack 200 and start.
Wherein, the value of third preset time t 2 is illustrated: since the battery pack 200 having been turned on will do it charging, electricity
Pressure can be gradually increasing, then, as long as the value of third preset time t 2 control it is good, then apart from upper starting battery pack
In 200 t2 time, the voltage of next battery pack 200 to be launched will meet in the battery pack 200 for being less than and having been turned on most
The sum of 200 voltage of baby battery group and predetermined voltage threshold.
(3) if electric discharge overcurrent alarm occurs in the battery pack 200 having been turned on, battery control unit 400 controls described next
A battery pack 200 starts.
Battery control unit 400 successively controls all battery packs 200 and starts, during battery pack 200 starts
According to 200 voltage of battery pack from the sequence access system busbar of small arrival, to solve between battery pack electric current in circulation circuit
Excessive problem.
In addition, if the alarm feelings such as battery module occurs in battery system quantity is abnormal, communication failures, electric discharge overcurrent
Condition, state are converted otherwise processed, are specifically described below.
In one embodiment of the invention, as shown in figure 3, by (i.e. battery pack before and after 200 access system busbar of battery pack
200 starting front and backs), tri- states of T0, T1, T2 are defined respectively:
(1) T0 state
Battery pack sequence starting process start marker and battery pack sequence starting process end of identification position all it is invalid this
In section section, and battery system does not complete primary all battery data scannings or battery system is passed through till now from starting
Time be less than scheduled time t.Or current system occurs that battery pack quantity is abnormal, communication failures alarm, then switchs to this
Kind state.
(2) T1 state
Battery pack sequence starting process start marker effectively with battery pack sequence starting process end of identification position it is invalid
In this section of section, in sequence access system busbar of this stage battery pack 200 according to global voltage from small to large.
(3) T2 state
Battery pack sequence starting process start marker effectively with battery pack sequence starting process end of identification position it is effective
In this section of section, battery pack 200 of battery system completing accesses busbar work.
Fig. 4 show the sequence starting state transition condition schematic diagram of battery system.Every kind of state enters NextState
Condition it is as follows:
(1) starting starts (T0 → T1)
Battery control unit 400 is completed the voltage data of one week M battery pack 200 of poll, and system is from starting to
Elapsed time is greater than scheduled time t now, and the functions such as current system battery module quantity, communication are normal.
(2) start-up course (T1 → T2)
When entering the T1 stage, battery pack 200 sequentially sequences access system according to voltage value from small to large, thereafter according to
Whether the voltage difference between whole system battery pack 200 starts in two kinds of situation all within 5V, in the embodiment of front
Through being illustrated, details are not described herein.
(3) starting waits (T2 → T0 or T1 → T0)
1, there is the recovery of 200 discharge prevention of battery pack in T1 or T2 state in system；
2, there is battery module quantity, communication failures alarm in T1 or T2 state, in battery system in system.
The battery system of the embodiment of the present invention, the heavy current impact of capacitive load, solves electricity when avoiding cold start
The excessive problem of electric current in circulation circuit between the group of pond, and only used in the battery system preliminary filling resistance and a preliminary filling after
Electric appliance thus greatly reduces cost.
Battery system in based on the above embodiment, the invention also provides a kind of starting control methods of battery system.
Fig. 5 is the flow chart of the starting control method of battery system according to an embodiment of the invention.As shown in figure 5,
The starting control method of the battery system of the embodiment of the present invention, comprising the following steps:
S1, after battery system electrifying startup, battery control unit controls preliminary filling relay closure.
Specifically, after battery system electrifying startup, all relays in battery system are in off-state, battery control
Unit processed controls preliminary filling relay K0 closure first, to avoid the issuable heavy current impact of capacitive load when cold start.
S2, battery control unit are polled M battery pack to obtain the sequence of the voltage of each battery pack.
Wherein, the battery management unit for referring to battery control unit successively with M battery pack is polled to M battery pack
It is communicated to obtain the status information of M battery pack.
Specifically, battery control unit is communicated with each battery management unit respectively, to obtain all battery packs
The data such as voltage, temperature, after the data of all battery packs of the complete battery system of battery control unit poll, by battery pack
It is ranked up according to the sequence of voltage from small to large.
S3, after the first preset time of battery system electrifying startup, battery control unit is according to the electricity of each battery pack
Pressure sequence is by being controlled such that M battery pack is successively started by voltage from as low as big sequence to M relay.
Wherein, the starting of control battery pack refers to control battery pack access the first output bus 11.
In one embodiment of the invention, step S3 is specifically included: the battery control unit root after the first preset time
The smallest battery pack of voltage in M battery pack is obtained according to the voltage sequence of each battery pack, and controls the smallest battery pack of voltage
Corresponding relay is closed so that the smallest battery pack of voltage starts, while controlling the disconnection of preliminary filling relay.
Specifically, after powering on the first preset time t (for example, t is 1 second) apart from battery system, battery control unit control
The corresponding relay of the smallest battery pack of voltage processed is closed so that the smallest battery pack starting of voltage, while controlling preliminary filling relay
K0 is disconnected.
In one embodiment of the invention, step S3 further include: after voltage the smallest battery pack starting, if M
Voltage difference between battery pack is less than or equal to predetermined voltage threshold, battery control unit according to battery pack voltage from it is small to
Big sequence controls M-1 battery pack every the second preset time and successively starts.
Specifically, after control preliminary filling relay K0 is disconnected, judge whether the voltage difference between M battery pack is less than
Or it is equal to predetermined voltage threshold (for example, 112m Ω * 50A is approximately equal to 5V), if the voltage difference between battery pack is less than or waits
In predetermined voltage threshold, then further judge whether the time started apart from a upper battery pack has reached the second preset threshold
T1 is circuited sequentially, has successively been started until by remaining M-1 battery pack if it is, controlling next group of battery pack starting
Finish.Wherein, the sequencing of battery pack starting is the voltage sequence from small to large according to battery pack.
In another embodiment of the present invention, step S3 further include: after voltage the smallest battery pack starting, if M
Voltage difference between a battery pack is greater than predetermined voltage threshold, and battery control unit judges whether to start next battery pack
When, wherein if the time interval for starting battery pack with upper one reaches third preset time, battery control unit control is next
A battery pack starting；If the voltage of next battery pack is less than minimum battery voltage and default electricity in the battery pack having been turned on
It presses the sum of threshold value and the time interval for starting battery pack with upper one reaches the second preset time, battery control unit control is next
A battery pack starting；If discharge current alarm occurs in the battery pack having been turned on, battery control unit controls next battery pack
Starting.
It is understood that next battery pack refers to the smallest battery pack of voltage in inactive battery pack.
Specifically, after control preliminary filling relay K0 is disconnected, judge whether the voltage difference between M battery pack is less than
Or it is equal to predetermined voltage threshold (for example, 112m Ω * 50A is approximately equal to 5V), it is preset if the voltage difference between battery pack is greater than
Voltage threshold, then battery control unit judges whether to start next battery pack, if meeting any of following three kinds of situations,
All control starts next battery pack:
(1) if the voltage of next battery pack is less than minimum battery voltage and predeterminated voltage in the battery pack having been turned on
The sum of threshold value and with upper one start battery pack time interval reach the second preset time t 1, under battery control unit then controls
One battery pack starting.
(2) if the time interval for starting battery pack with upper one reaches third preset time t 2, if battery control unit
Control next battery pack starting.
Battery control unit successively controls all battery pack startings, according to battery pack during battery pack starting
Voltage is from the sequence access system busbar of small arrival, to solve the problems, such as that electric current is excessive in circulation circuit between battery pack.
Fig. 6 is the flow chart of the starting control method of battery system accord to a specific embodiment of that present invention.Such as Fig. 6 institute
Show, the starting control method of the battery system of the embodiment of the present invention, comprising the following steps:
S101 controls preliminary filling relay K0 closure after battery system powers on.
Do S102, BCU judge whether one week complete to the data polling of M battery pack? if so, S103 is executed, if it is not, returning
S102 continues to judge.
Do S103, the time interval for judging to power on from battery system till now have reached the first preset time t? if so,
S104 is then executed, continues to judge if it is not, returning to S103.
S104, the smallest battery pack starting of control voltage, and disconnect preliminary filling relay K0.
Does S105, judge whether the voltage difference between battery pack is both less than equal to predetermined voltage threshold (for example, 5V)? if
It is to execute S107, if it is not, executing S109 or S110 or S111.
Do S106, judgement have reached the second preset time t 1 with upper battery pack starting time interval? if so, executing
S107 continues to judge if it is not, returning to S106.
S107 controls next battery pack starting.
Does S108 judge whether that all battery packs all have been turned on? if so, battery pack sequence starting is completed, held if it is not, returning
Row S106.
Do S109, judgement have reached third preset time t 2 with upper battery pack starting time interval? if so, executing
S112 executes S109 or S110 or S111 if it is not, returning.
S110 judges whether next battery voltage to be accessed is less than (the minimum battery voltage+5V accessed),
And reach the second preset time t 1 apart from upper battery pack starting time interval? if so, executing S112, held if it is not, returning
Row S109 or S110 or S111.
Does S111 judge that overcurrent alarm of discharging occurs in the battery pack having been turned on? if so, executing S112, held if it is not, returning
Row S109 or S110 or S111.
S112 controls next battery pack starting.
Does S113 judge whether that all battery packs all have been turned on? if so, battery pack sequence starting is completed, held if it is not, returning
Row S109 or S110 or S111.
The starting control method of the battery system of the embodiment of the present invention, the high current of capacitive load when avoiding cold start
Impact solves the problems, such as that electric current is excessive in circulation circuit between battery pack, and has only used a preliminary filling resistance in battery system
With a preliminary filling relay, cost is thus greatly reduced.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (12)
1. a kind of battery system characterized by comprising
Preliminary filling unit, the preliminary filling unit include the preliminary filling resistance and preliminary filling relay being connected in series；
M relay and M diode, wherein M is the integer greater than 1；
M battery pack, the first output end of the M battery pack and the M relay one-to-one correspondence connect after with it is described pre-
The first end for filling unit is connected, and the first end of the preliminary filling unit is connected on the first output bus, and the of the M battery pack
Two output ends are electrically connected with the second output bus；The first end of first output end of the M battery pack and the M diode
Series connection is corresponded, the second end of the M diode is connected after linking together with the second end of the preliminary filling unit；
M battery management unit, M battery management unit and M battery pack connect one to one to acquire respective battery group
Status information；
Battery control unit, the battery control unit are communicated with the M battery management unit respectively, the battery control
Unit processed for controlling preliminary filling relay closure after the battery system electrifying startup, and to the M battery pack into
Row poll is sorted with the voltage for obtaining each battery pack, and according to the voltage of each battery pack after the first preset time
Sequence is by being controlled such that the M battery pack is successively started by voltage from as low as big sequence to the M relay.
2. battery system according to claim 1, which is characterized in that each battery pack in the M battery pack includes N
The battery module of a series connection, N are the integer more than or equal to 1；The battery management unit includes N number of sub- battery management list
Member, every sub- battery management unit acquire the status information of a battery module and are communicated with the battery control unit.
3. battery system according to claim 1, which is characterized in that the first output end of the M battery pack is anode
Output end, second output terminal are cathode output end；The first output bus is anode output bus, the second output bus
Bus is exported for cathode.
4. battery system according to claim 1, which is characterized in that the first output end of the M battery pack is cathode
Output end, the second output terminal are cathode output end；The first output bus is that cathode exports bus, second output
Bus is anode output bus.
5. battery system according to claim 1, which is characterized in that the first end of the M diode is anode, described
The second end of M diode is cathode；Or the first end of the M diode is cathode, the second end of the M diode
For anode.
6. battery system according to claim 1, which is characterized in that the battery control after first preset time
Unit obtains the smallest battery pack of voltage in the M battery pack according to the sequence of the voltage of each battery pack, and controls institute
The corresponding relay of the smallest battery pack of voltage is stated to be closed so that the smallest battery pack of the voltage starts, while controlling described pre-
Fill relay disconnection.
7. battery system according to claim 6, which is characterized in that after the voltage the smallest battery pack starting, such as
Voltage difference between M battery pack described in fruit is less than or equal to predetermined voltage threshold, and the battery control unit is according to battery
The sequence of the voltage of group from small to large controls M-1 battery pack every the second preset time and successively starts.
8. battery system according to claim 6, which is characterized in that after the voltage the smallest battery pack starting, such as
Voltage difference between M battery pack described in fruit is greater than predetermined voltage threshold, and the battery control unit judges whether under starting
When one battery pack, wherein
If the time interval for starting battery pack with upper one reaches third preset time, described in the battery control unit control
Next battery pack starting；
If the voltage of next battery pack is less than minimum battery voltage and the default electricity in the battery pack having been turned on
The sum of pressure threshold value and the time interval for starting battery pack with upper one reach the second preset time, the battery control unit control
Next battery pack starting；
If discharge current alarm occurs in the battery pack having been turned on, the battery control unit controls next battery
Group starting.
9. a kind of starting control method of the battery system provided based on claim 1, which comprises the following steps:
After the battery system electrifying startup, the battery control unit controls the preliminary filling relay closure；
The battery control unit is polled the M battery pack to obtain the sequence of the voltage of each battery pack；And
After the first preset time of the battery system electrifying startup, the battery control unit is according to each battery pack
Voltage sequence by the M relay be controlled such that the M battery pack by voltage from as low as big sequence according to
Secondary starting.
10. the starting control method of battery system as claimed in claim 9, which is characterized in that described in the battery system
It is sorted according to the voltage of each battery pack by controlling the M relay after the first preset time of electrifying startup
So that the M battery pack successively starts, specifically include:
The battery control unit obtains the M according to the sequence of the voltage of each battery pack after first preset time
The smallest battery pack of voltage in a battery pack, and the corresponding relay closure of the smallest battery pack of the voltage is controlled so that described
The smallest battery pack starting of voltage, while controlling the preliminary filling relay and disconnecting.
11. the starting control method of battery system as claimed in claim 10, which is characterized in that further include:
After the voltage the smallest battery pack starting, if the voltage difference between the M battery pack is less than or equal in advance
If voltage threshold, the battery control unit is controlled according to the voltage sequence from small to large of battery pack every the second preset time
M-1 battery pack successively starts.
12. the starting control method of battery system as claimed in claim 10, which is characterized in that further include:
After the voltage the smallest battery pack starting, if the voltage difference between the M battery pack is greater than predeterminated voltage
Threshold value, when the battery control unit judges whether to start next battery pack, wherein
If the time interval for starting battery pack with upper one reaches third preset time, described in the battery control unit control
Next battery pack starting；
If the voltage of next battery pack is less than minimum battery voltage and the default electricity in the battery pack having been turned on
The sum of pressure threshold value and the time interval for starting battery pack with upper one reach the second preset time, the battery control unit control
Next battery pack starting；
If discharge current alarm occurs in the battery pack having been turned on, the battery control unit controls next battery
Group starting.
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| CN201510855611.9A CN106816652B (en) | 2015-11-27 | 2015-11-27 | Battery system and its starting control method |
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| CN201510855611.9A CN106816652B (en) | 2015-11-27 | 2015-11-27 | Battery system and its starting control method |
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| CN107947261A (en) * | 2017-11-14 | 2018-04-20 | 欣旺达电子股份有限公司 | Multi-string battery powering method, apparatus and system |
| CN108054745B (en) * | 2017-12-15 | 2019-11-15 | 天津津航计算技术研究所 | A kind of method for controlling power supply with capacitive overload protection |
| CN109167111A (en) * | 2018-07-12 | 2019-01-08 | 国网山西省电力公司电力科学研究院 | The LiFePO4 standby battery group charging method for inhibiting circulation to generate |
| CN114295974B (en) * | 2021-12-30 | 2023-11-10 | 上海儒竞智控技术有限公司 | Method and circuit for detecting failure of precharge relay |
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| JP2012034515A (en) * | 2010-07-30 | 2012-02-16 | Sanyo Electric Co Ltd | Power supply device for vehicle |
| JP2012217276A (en) * | 2011-03-31 | 2012-11-08 | Sanyo Electric Co Ltd | Power supply and vehicle having the same |
| WO2014156041A1 (en) * | 2013-03-29 | 2014-10-02 | 三洋電機株式会社 | Power supply system and charging and discharging control method for power supply system |
| CN104600784B (en) * | 2014-12-25 | 2017-10-27 | 北京新能源汽车股份有限公司 | The upper current-programmed method and apparatus of multiple branch circuit battery energy storage system |
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