CN106253374A - The compensation method of each branch current during a kind of lithium battery group parallel operation - Google Patents
The compensation method of each branch current during a kind of lithium battery group parallel operation Download PDFInfo
- Publication number
- CN106253374A CN106253374A CN201610625742.2A CN201610625742A CN106253374A CN 106253374 A CN106253374 A CN 106253374A CN 201610625742 A CN201610625742 A CN 201610625742A CN 106253374 A CN106253374 A CN 106253374A
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- China
- Prior art keywords
- lithium battery
- battery group
- parallel
- internal resistance
- branch road
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Classifications
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- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
Abstract
The present invention relates to the compensation method of each branch current during a kind of lithium battery group parallel operation, belong to field of lithium.The compensation method of each branch current during a kind of lithium battery group parallel operation, one two resistor coupled in parallel circuit of series connection on every branch road of the lithium battery group power supply circuits composed in parallel by some lithium battery groups, and on a wherein branch road of two resistor coupled in parallel circuit, it is in series with HF switch, an internal resistance measurement device in parallel in each lithium battery group；The break-make of described HF switch is by PWM drive circuit control；Described internal resistance measurement device is measured the resistance of lithium battery group internal resistance in real time and feeds back to PWM drive circuit, so that PWM drive circuit selects suitable dutycycle.The present invention effective compensation lithium battery group internal resistance can change the curent change caused, and keeps each branch current equal.
Description
Technical field
The present invention relates to field of lithium, particularly to the compensation side of each branch current during a kind of lithium battery group parallel operation
Method.
Background technology
When lithium battery dump energy (State Of Charge, SOC) is different, its DC internal resistance is also different, and
With the minimizing of dump energy, its DC internal resistance increases.
As it is shown in figure 1, when the parallel connection of lithium battery group being powered load, the working condition of each branch road lithium battery group is also
Not being strict conformance, therefore, the value of its each branch road lithium battery internal resistance is also likely to be different, then result in each branch current
The most equal.
Summary of the invention
Present invention aims to the problems referred to above, it is provided that each branch current during a kind of lithium battery group parallel operation
Compensation method, effective compensation lithium battery group internal resistance can change the curent change caused, keep each branch current equal.
The object of the present invention is achieved like this:
The compensation method of each branch current during a kind of lithium battery group parallel operation, it is characterised in that by some lithium batteries
One two resistor coupled in parallel circuit of series connection on every branch road of the lithium battery group power supply circuits that group composes in parallel, and at two resistance also
It is in series with HF switch, an internal resistance measurement device in parallel in each lithium battery group on a wherein branch road of connection circuit；Institute
State the break-make of HF switch by PWM drive circuit control；Described internal resistance measurement device measures the resistance of lithium battery group internal resistance in real time
And feed back to PWM drive circuit, so that PWM drive circuit selects suitable dutycycle.
Wherein, every branch road of described lithium battery group power supply circuits is also in series with current sensor, described current sense
Device is for checking the compensation effect of each branch road in lithium battery group power supply circuits.
The invention have the benefit that this method effective compensation lithium battery group internal resistance can change the curent change caused, protect
Hold each branch current equal.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of existing lithium battery group parallel operation.
Fig. 2 is embodiments of the invention structure chart.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the present invention is expanded on further.
The compensation method of each branch current during a kind of lithium battery group parallel operation, composed in parallel by some lithium battery groups
One two resistor coupled in parallel circuit of series connection on every branch road of lithium battery group power supply circuits, and at two resistor coupled in parallel circuit wherein
Article one, branch road is in series with HF switch, an internal resistance measurement device in parallel in each lithium battery group；Described HF switch
Break-make is by PWM drive circuit control；Described internal resistance measurement device is measured the resistance of lithium battery group internal resistance in real time and feeds back to PWM and drive
Galvanic electricity road, so that PWM drive circuit selects suitable dutycycle.
For checking the compensation effect of each branch road in lithium battery group power supply circuits, at every of described lithium battery group power supply circuits
Current sensor also it is in series with on branch road,.
As in figure 2 it is shown, lithium battery group power supply circuits are specifically by lithium battery group 1, lithium battery group 2 and lithium battery group 3 joint group
Become, each lithium battery group is parallel with an internal resistance measurement device, corresponding lithium battery group 1, lithium battery group 2 and lithium battery group 3
It is respectively internal resistance measurement device 1, internal resistance measurement device 2 and internal resistance measurement device 3, at every branch road of lithium battery group power supply circuits
On, one two resistor coupled in parallel circuit being made up of m Ω level resistance R1 and m Ω level resistance R2 of series connection respectively, and at two resistor coupled in parallel
Being in series with HF switch on the branch road of the resistance R1 in circuit, corresponding lithium battery group 1, lithium battery group 2 and lithium battery group 3 are respectively
HF switch S1, HF switch S2 and HF switch S3；Meanwhile, every branch road of lithium battery group power supply circuits is also in series with
One current sensor, corresponding lithium battery group 1, lithium battery group 2 and lithium battery group 3 are respectively current sensor A1, current sense
Device A2 and current sensor A3.
Utilize this lithium battery group power supply circuits power supply direct to dc motor or by inverter circuit to exchange
Motor is powered.At initial period, dump energy is sufficient, and each branch road HF switch S1, S2 and S3 all disconnect, in each branch road
The resistance of resistance can be considered resistance and the resistance sum of two resistor coupled in parallel circuit of each lithium battery group internal resistance.Along with power supply process
Carrying out, the interior resistive of each lithium battery group is big, and each branch road lithium battery group internal resistance change is asynchronous, and curent change is the most different
Step.Now, HF switch is started working, the duty cycle alpha of PWM drive circuit output signal control the break-make of HF switch,
Because the switching frequency of HF switch the highest (up to 20kHz), it is possible to consider each by the meansigma methods of certain period of time
The internal resistance on road, equally, it is also possible to consider the electric current of each branch road by the meansigma methods of certain period of time.Now, Wherein, R0Open for high frequency
The conducting resistance closed, α is the dutycycle of PWM drive circuit output signal.Consider make the branch road internal resistance of each branch road equal and be
A certain constant C, utilize internal resistance measurement device 1, internal resistance measurement device 2 and internal resistance measurement device 3 measure respectively lithium battery group 1,
The internal resistance resistance of lithium battery group 2 and lithium battery group 3, is determined suitably by the internal resistance resistance of measured each lithium battery group
The duty cycle alpha of PWM drive circuit output signal is identical to ensure the electric current of each branch road.
Finally, the electric current of each branch road recorded by current sensor A1, current sensor A2 and current sensor A3 is true
The duty cycle alpha of the PWM drive circuit output signal that fixed each branch road is corresponding is the most suitable, and the electric current of each branch road is the most equal.
The present invention uses high frequency switching elements to form variable resistance, and combines internal resistance measurement device, in parallel in lithium battery group
Compensate the branch current change caused because of lithium battery group internal resistance change during power supply, utilize HF switch to adjust each branch road the most electric
The size of resistance, thus ensure that each branch resistance value is equal and for same constant, and then ensure that each branch current is equal.The present invention
Can effective compensation lithium battery group parallel operation time internal resistance change the curent change that causes, keep each branch current equal.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any
Above-described embodiment all can be modified under the spirit and the scope of the present invention and change by skilled person.Therefore,
The scope of the present invention, should be as listed by claims.
Claims (2)
1. the compensation method of each branch current during a lithium battery group parallel operation, it is characterised in that by some lithium battery groups
One two resistor coupled in parallel circuit of series connection on every branch road of the lithium battery group power supply circuits composed in parallel, and at two resistor coupled in parallel
It is in series with HF switch, an internal resistance measurement device in parallel in each lithium battery group on a wherein branch road of circuit；Described
The break-make of HF switch is by PWM drive circuit control；Described internal resistance measurement device measures the resistance of lithium battery group internal resistance also in real time
Feed back to PWM drive circuit, so that PWM drive circuit selects suitable dutycycle.
The compensation method of each branch current during a kind of lithium battery group parallel operation the most according to claim 1, its feature exists
In, every branch road of described lithium battery group power supply circuits is also in series with current sensor, described current sensor is used for checking
The compensation effect of each branch road in lithium battery group power supply circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625742.2A CN106253374A (en) | 2016-08-02 | 2016-08-02 | The compensation method of each branch current during a kind of lithium battery group parallel operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625742.2A CN106253374A (en) | 2016-08-02 | 2016-08-02 | The compensation method of each branch current during a kind of lithium battery group parallel operation |
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| Publication Number | Publication Date |
|---|---|
| CN106253374A true CN106253374A (en) | 2016-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610625742.2A Pending CN106253374A (en) | 2016-08-02 | 2016-08-02 | The compensation method of each branch current during a kind of lithium battery group parallel operation |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208820A (en) * | 2010-03-29 | 2011-10-05 | 比亚迪股份有限公司 | Energy storage battery pack parallel-connection device and control method thereof |
| CN102447292A (en) * | 2012-01-09 | 2012-05-09 | 张从峰 | Battery/capacitor bank current sharing control circuit |
| CN104993538A (en) * | 2015-07-06 | 2015-10-21 | 苏州海格新能源汽车电控系统科技有限公司 | Balancing application device and method for chargeable battery pack |
-
2016
- 2016-08-02 CN CN201610625742.2A patent/CN106253374A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208820A (en) * | 2010-03-29 | 2011-10-05 | 比亚迪股份有限公司 | Energy storage battery pack parallel-connection device and control method thereof |
| CN102447292A (en) * | 2012-01-09 | 2012-05-09 | 张从峰 | Battery/capacitor bank current sharing control circuit |
| CN104993538A (en) * | 2015-07-06 | 2015-10-21 | 苏州海格新能源汽车电控系统科技有限公司 | Balancing application device and method for chargeable battery pack |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161221 |
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| RJ01 | Rejection of invention patent application after publication |