CN208862616U - A kind of current limiting system of battery management - Google Patents
A kind of current limiting system of battery management Download PDFInfo
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- CN208862616U CN208862616U CN201821812458.7U CN201821812458U CN208862616U CN 208862616 U CN208862616 U CN 208862616U CN 201821812458 U CN201821812458 U CN 201821812458U CN 208862616 U CN208862616 U CN 208862616U
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- lithium battery
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Abstract
The utility model embodiment discloses a kind of current limiting system of battery management.It include: charger and lithium battery group, current collection circuit, voltage collection circuit, battery management system BMS master control borad, photoelectric isolating driving circuit, MOS switch pipe, current-limiting inductance；The input terminal of current collection circuit is connected with the negative terminal of lithium battery group, and the input terminal of voltage collection circuit is connected with the anode of lithium battery, and the output end of current collection circuit and the output end of voltage collection circuit are connected with the input terminal of BMS master control borad；The output end of BMS master control borad is connected with the input terminal of photoelectric isolating driving circuit, the control terminal of photoelectric isolating driving circuit is connected with the controlled end of MOS switch pipe, one end of MOS switch pipe is connected with the negative terminal of charger, the other end of MOS switch pipe is connected with one end of current-limiting inductance, and the other end of current-limiting inductance is connected with the negative terminal of lithium battery group.The current limiting system of battery management provided by the embodiment of the utility model can reduce circuit area, power consumption and cost.
Description
Technical field
The utility model embodiment is related to technical field of battery management more particularly to a kind of current limiting system of battery management.
Background technique
Battery backup, battery management system (Battery Management are usually mounted in communication base station
System, BMS) during the charging process, it needs to carry out current limliting using current limliting module, to prevent electric current excessive or overcharge is to battery
It damages.
In the prior art, in BMS control mainboard, additional one piece of independent current limiting plate or current limliting module are to realize current limliting
Effect.Including power management control chip, Current Voltage Acquisition Circuit and accessory power supply etc. in independent current limliting module, so that
The control circuit of entire battery management system is complicated, area occupied is big, and independent current limliting module not only increases cost, but also
It is at high cost.
Utility model content
The utility model embodiment provides a kind of current limiting system of battery management, to realize the current limliting in battery management,
Circuit area, power consumption and cost can be reduced.
In a first aspect, the utility model embodiment provides a kind of current limiting system of battery management, including charger and lithium
Battery pack, further includes: current collection circuit, voltage collection circuit, battery management system BMS master control borad, Phototube Coupling driving electricity
Road, MOS switch pipe, current-limiting inductance；
The input terminal of the current collection circuit is connected with the negative terminal of the lithium battery group, the voltage collection circuit it is defeated
Enter end to be connected with the anode of the lithium battery, the output end of the output end of the current collection circuit and the voltage collection circuit
It is connected with the input terminal of the BMS master control borad；The output end of the BMS master control borad is defeated with the photoelectric isolating driving circuit
Enter end to be connected, the control terminal of the photoelectric isolating driving circuit is connected with the controlled end of the MOS switch pipe, the MOS switch
One end of pipe is connected with the negative terminal of the charger, one end phase of the other end of the MOS switch pipe and the current-limiting inductance
Even, the other end of the current-limiting inductance is connected with the negative terminal of the lithium battery group；
The current collection circuit acquires the charging current of the lithium battery group, and the charging current is sent to described
BMS master control borad；The voltage collection circuit acquires the charging voltage of the lithium battery group, and the charging voltage is sent to institute
State BMS master control borad；The BMS master control borad generates pulse width modulation according to the charging current and/or the charging voltage
Pwm signal, and the pwm signal is sent to the photoelectric isolating driving circuit；The photoelectric isolating driving circuit amplifies institute
Pwm signal is stated, and determines the on and off of the MOS switch pipe according to the pwm signal.
Further, the current collection circuit includes current sensing resistance and operational amplifier；
The first input with the other end of the current-limiting inductance, the operational amplifier respectively of one end of the current sensing resistance
End is connected；The second input with the negative terminal of the lithium battery group, the operational amplifier respectively of the other end of the current sensing resistance
End is connected；The output end of the operational amplifier is connected with the input terminal of the BMS master control borad.
Further, the voltage collection circuit includes first resistor, second resistance and first capacitor；
One end of the first resistor is connected with the anode of the lithium battery group, the other end of the first resistor, described
One end of second resistance and one end of the first capacitor are connected with the input terminal of the BMS control panel；The second resistance
The other end and the other end of the first capacitor be connected with the negative terminal of the lithium battery group.
Further, the voltage collection circuit further include: 3rd resistor, the 4th resistance, the 5th resistance and the second capacitor；
One end of the 3rd resistor is connected with the negative terminal of the charger, the other end of the 3rd resistor and described the
One end of four resistance is connected；The other end of 4th resistance is connected with the negative terminal of the lithium battery group；5th resistance
One end is connected with the other end of the 3rd resistor, and the other end of the 5th resistance is connected with compensating end；Second capacitor
One end be connected with one end of the 5th resistance, the other end of second capacitor is connected with the negative terminal of the lithium battery group；
The other end of the 3rd resistor is connected with the input terminal of the voltage collection circuit.
Further, the photoelectric isolating driving circuit includes high speed photo coupling module, Shaping Module and MOS drive module；
The input terminal of the high speed photo coupling module is connected with the output end of the BMS master control borad, the high speed photo coupling module
Output end be connected with the input terminal of the Shaping Module, the output end of the Shaping Module is defeated with the MOS drive module
Enter end to be connected, the control terminal of the MOS drive module is connected with the controlled end of the MOS switch pipe.
It further, further include the first filter capacitor, freewheeling diode and the second filter capacitor；
One end of first filter capacitor is connected with the anode of the charger, the other end of first filter capacitor
It is connected with one end of the negative terminal of the charger and the MOS switch pipe；One end of the freewheeling diode and the charger
Anode be connected, the other end of the freewheeling diode is connected with the other end of the MOS switch pipe；Second filter capacitor
One end be connected with the anode of the charger, the other end and the other end phase of the current-limiting inductance of second filter capacitor
Even.
Second aspect, the utility model embodiment additionally provide a kind of current-limiting method of battery management, which is characterized in that institute
State the execution of method current limiting system as described in the utility model embodiment, comprising:
Acquire the current charging current and charging voltage of lithium battery group；
PWM value is determined according to the charging current and/or the charging voltage；
Current limliting adjusting is carried out to the lithium battery group according to the PWM value.
It is further, described that PWM value is determined according to the charging current and/or the charging voltage, comprising:
Judge whether the charging voltage is greater than target charging voltage value；
If more than then judging whether the charging current is greater than target charge current value；
It is if more than target charge current value, then inclined according to the charging current and the target charge current value calculating current
Difference, and PWM value is calculated according to the current deviation；
If being less than target charge current value, it is inclined that voltage is calculated according to the charging voltage and the target charging voltage
Difference, and PWM value is calculated according to the voltage deviation.
Further, after judging whether the charging voltage is greater than target charging voltage value, further includes:
It is inclined according to the charging current and the target charge current value calculating current if being less than target charge current value
Difference, and PWM value is calculated according to the current deviation.
The current limiting system of battery management provided by the embodiment of the utility model, including charger and lithium battery group, further includes:
Current collection circuit, voltage collection circuit, battery management system BMS master control borad, photoelectric isolating driving circuit, MOS switch pipe, limit
Galvanic electricity sense.The input terminal of current collection circuit is connected with the negative terminal of lithium battery group, the input terminal and lithium battery of voltage collection circuit
Anode be connected, the output end of the output end of current collection circuit and voltage collection circuit with the input terminal phase of BMS master control borad
Even.The output end of BMS master control borad is connected with the input terminal of photoelectric isolating driving circuit, the control terminal of photoelectric isolating driving circuit with
The controlled end of MOS switch pipe is connected, and one end of MOS switch pipe is connected with the negative terminal of charger, the other end of MOS switch pipe and
One end of current-limiting inductance is connected, and the other end of current-limiting inductance is connected with the negative terminal of lithium battery group.The utility model embodiment provides
Battery management current limiting system, simplify circuit system complexity, circuit area, power consumption and cost can be reduced.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the current limiting system of one of the utility model embodiment one battery management；
Fig. 2 is the structural schematic diagram of the current limiting system of one of the utility model embodiment one battery management；
Fig. 3 is the structural schematic diagram of one of the utility model embodiment one voltage collection circuit；
Fig. 4 is the structural schematic diagram of one of the utility model embodiment one photoelectric isolating driving circuit；
Fig. 5 is the structural schematic diagram of the current limiting system of one of the utility model embodiment one battery management；
Fig. 6 a is the flow chart of the current-limiting method of one of the utility model embodiment two battery management；
Fig. 6 b is the flow chart of the current-limiting method of one of the utility model embodiment two battery management.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of structural schematic diagram of the current limiting system for battery management that the utility model embodiment one provides, this reality
It applies example and is applicable to the case where carrying out current limliting in lithium battery group charging process, as shown in Figure 1, the current limiting system includes charger
110 and lithium battery group 120, further includes: current collection circuit 130, voltage collection circuit 140, battery management system BMS master control borad
150, photoelectric isolating driving circuit 160, MOS switch pipe 170, current-limiting inductance 180.
The input terminal of current collection circuit 130 is connected with the negative terminal of lithium battery group 120, the input of voltage collection circuit 140
End is connected with the anode of lithium battery group 120, and the output end of current collection circuit 130 and the output end of voltage collection circuit 140 are equal
It is connected with the input terminal of BMS master control borad 150.The output end of BMS master control borad 150 and the input terminal of photoelectric isolating driving circuit 160
It is connected, the control terminal of photoelectric isolating driving circuit 160 is connected with the controlled end of MOS switch pipe 170, one end of MOS switch pipe 170
Be connected with the negative terminal of charger 110, the other end of MOS switch pipe 170 is connected with one end of current-limiting inductance 180, current-limiting inductance
180 other end is connected with the negative terminal of lithium battery group 120.
Current collection circuit 130 acquires the charging current of lithium battery group 120, and charging current is sent to BMS master control borad
150.Voltage collection circuit 140 acquires the charging voltage of lithium battery group 120, and charging voltage is sent to BMS master control borad 150.
BMS master control borad 150 according to charging current and/or charging voltage generate pulse width modulation (Pulse Width Modulation,
PWM) signal, and pwm signal is sent to photoelectric isolating driving circuit 160；Photoelectric isolating driving circuit 160 amplifies pwm signal,
And the on and off of MOS switch pipe 170 is determined according to PWM signal.
Wherein, BMS master control borad 150 is the kernel control chip in current limiting system, the main short circuit for completing lithium battery group, mistake
Stream, over-voltage, temperature protection function and the monitoring function to battery current, voltage.BMS master control borad 150 is adopted with High Speed Analog
Collect function, can quickly handle collected electric current and voltage, and control calculating is carried out to current loop.BMS master control borad 150
Pwm signal is generated according to charging current and/or charging voltage, and output pwm signal is to photoelectric isolating driving circuit 160.Photoelectricity every
The switch of MOS switch pipe is controlled according to pwm signal from driving circuit 160, to adjust charging current and charging voltage height
It is low, it flexibly can continuously adjust charging current limiter point and charging voltage.
Optionally, Fig. 2 is a kind of structural representation of the current limiting system for battery management that the utility model embodiment one provides
Figure, as shown in Fig. 2, current collection circuit 130 includes current sensing resistance and operational amplifier；One end of current sensing resistance respectively with current limliting
The other end of inductance 180, the first input end of operational amplifier are connected；The other end of current sensing resistance respectively with lithium battery group 120
Negative terminal, operational amplifier the second input terminal be connected；The input terminal phase of the output end of operational amplifier and BMS master control borad 150
Even.
Optionally, Fig. 3 is a kind of structural schematic diagram for voltage collection circuit that the utility model embodiment one provides.Such as figure
Shown in 3, voltage collection circuit includes first resistor, second resistance and first capacitor.One end of first resistor and lithium battery group
Anode is connected, input terminal of the one end of the other end of first resistor, one end of second resistance and first capacitor with BMS control panel
It is connected；The other end of second resistance and the other end of first capacitor are connected with the negative terminal of lithium battery group.
Optionally, voltage collection circuit further include: 3rd resistor, the 4th resistance, the 5th resistance and the second capacitor.Third electricity
One end of resistance is connected with the negative terminal of charger, and the other end of 3rd resistor is connected with one end of the 4th resistance；4th resistance it is another
One end is connected with the negative terminal of lithium battery group；One end of 5th resistance is connected with the other end of 3rd resistor, the 5th resistance it is another
End is connected with compensating end；One end of second capacitor is connected with one end of the 5th resistance, the other end and lithium battery group of the second capacitor
Negative terminal be connected；The other end of 3rd resistor is connected with the input terminal of voltage collection circuit.
Optionally, photoelectric isolating driving circuit includes high speed photo coupling module, Shaping Module and MOS drive module.High-speed light
The input terminal of coupling module is connected with the output end of BMS master control borad, the output end of high speed photo coupling module and the input terminal of Shaping Module
It is connected, the output end of Shaping Module is connected with the input terminal of MOS drive module, the control terminal and MOS switch of MOS drive module
The controlled end of pipe is connected.
Illustratively, Fig. 4 is a kind of structural representation for photoelectric isolating driving circuit that the utility model embodiment one provides
Figure, as shown in figure 4, photoelectric isolating driving circuit is driven by current limliting BUCK, pwm signal successively passes through high speed photo coupling chip, whole
Shape chip and MOS driving chip realize the driving to pwm signal.
Optionally, Fig. 5 is a kind of structural representation of the current limiting system for battery management that the utility model embodiment one provides
Figure, as shown in figure 5, further including the first filter capacitor, freewheeling diode and the second filter capacitor.The one of first filter capacitor
End is connected with the anode of the charger, the other end of first filter capacitor and the negative terminal of the charger and the MOS
One end of switching tube is connected；One end of the freewheeling diode is connected with the anode of the charger, the freewheeling diode
The other end is connected with the other end of the MOS switch pipe；The anode phase of one end of second filter capacitor and the charger
Even, the other end of second filter capacitor is connected with the other end of the current-limiting inductance.
The current limiting system of battery management provided by the embodiment of the utility model, including charger and lithium battery group, further includes:
Current collection circuit, voltage collection circuit, battery management system BMS master control borad, photoelectric isolating driving circuit, MOS switch pipe, limit
Galvanic electricity sense.The input terminal of current collection circuit is connected with the negative terminal of lithium battery group, the input terminal and lithium battery of voltage collection circuit
Anode be connected, the output end of the output end of current collection circuit and voltage collection circuit with the input terminal phase of BMS master control borad
Even.The output end of BMS master control borad is connected with the input terminal of photoelectric isolating driving circuit, the control terminal of photoelectric isolating driving circuit with
The controlled end of MOS switch pipe is connected, and one end of MOS switch pipe is connected with the negative terminal of charger, the other end of MOS switch pipe and
One end of current-limiting inductance is connected, and the other end of current-limiting inductance is connected with the negative terminal of lithium battery group.The utility model embodiment provides
Battery management current limiting system, simplify circuit system complexity, circuit area, power consumption and cost can be reduced.
Embodiment two
Fig. 6 a is a kind of flow chart of the current-limiting method for battery management that the utility model embodiment two provides, such as Fig. 6 a institute
Show, this method comprises the following steps:
Step 210, the current charging current and charging voltage of lithium battery group is acquired.
Specifically, lithium battery group is during the charging process, the current charging electricity of lithium battery group is obtained by current collection circuit
Stream obtains the current charging voltage of lithium battery group by voltage collection circuit.
Step 220, PWM value is determined according to charging current and/or charging voltage.
Specifically, determining PWM value according to charging current and/or charging voltage, it can be implemented by following manner: judgement charging
Whether voltage is greater than target charging voltage value；If more than then judging whether charging current is greater than target charge current value；If more than
Target charge current value then according to charging current and target charge current value calculating current deviation, and is calculated according to current deviation
PWM value；If being less than target charge current value, voltage deviation is calculated according to charging voltage and target charging voltage, and according to electricity
Deviation is pressed to calculate PWM value.
It further include following steps after judging whether charging voltage is greater than target charging voltage value: if being filled less than target
Electric current value then according to charging current and target charge current value calculating current deviation, and calculates PWM value according to current deviation.
Step 230, current limliting adjusting is carried out to lithium battery group according to PWM value.
After obtaining PWM value, current regulation is carried out to lithium battery according to PWM value.
Fig. 6 b is a kind of flow chart of the current-limiting method for battery management that the utility model embodiment two provides, as to upper
Being explained further for embodiment is stated, as shown in Figure 6 b, this method comprises the following steps:
Step 310, battery terminal voltage, electric current are sampled.
Step 320, judge whether cell voltage is greater than target charging voltage, if more than 330 being thened follow the steps, if less
In thening follow the steps 360.
Step 330, judge whether electric current is greater than target charge current, if more than, 360 are thened follow the steps, if being not more than,
Execute step 340.
Step 340, voltage deviation value is calculated.
Step 350, pass through voltage PID arithmetic PWM value.
Step 360, calculating current deviation.
Step 370, pass through electric current PID arithmetic PWM value.
Step 380, current limliting adjusting is carried out to lithium battery group according to PWM value.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (6)
1. a kind of current limiting system of battery management, including charger and lithium battery group, which is characterized in that further include: current acquisition
Circuit, voltage collection circuit, battery management system BMS master control borad, photoelectric isolating driving circuit, MOS switch pipe, current-limiting inductance；
The input terminal of the current collection circuit is connected with the negative terminal of the lithium battery group, the input terminal of the voltage collection circuit
Be connected with the anode of the lithium battery, the output end of the output end of the current collection circuit and the voltage collection circuit with
The input terminal of the BMS master control borad is connected；The output end of the BMS master control borad and the input terminal of the photoelectric isolating driving circuit
It is connected, the control terminal of the photoelectric isolating driving circuit is connected with the controlled end of the MOS switch pipe, the MOS switch pipe
One end is connected with the negative terminal of the charger, and the other end of the MOS switch pipe is connected with one end of the current-limiting inductance, institute
The other end for stating current-limiting inductance is connected with the negative terminal of the lithium battery group；
The current collection circuit acquires the charging current of the lithium battery group, and the charging current is sent to the BMS
Master control borad；The voltage collection circuit acquires the charging voltage of the lithium battery group, and the charging voltage is sent to described
BMS master control borad；The BMS master control borad generates pulse width modulation (PWM) letter according to the charging current and/or the charging voltage
Number, and the pwm signal is sent to the photoelectric isolating driving circuit；The photoelectric isolating driving circuit amplifies the PWM
Signal, and determine according to the pwm signal on and off of the MOS switch pipe.
2. current limiting system according to claim 1, which is characterized in that the current collection circuit includes current sensing resistance and fortune
Calculate amplifier；
One end of current sensing resistance first input end phase with the other end of the current-limiting inductance, the operational amplifier respectively
Even；The other end of the current sensing resistance the second input terminal phase with the negative terminal of the lithium battery group, the operational amplifier respectively
Even；The output end of the operational amplifier is connected with the input terminal of the BMS master control borad.
3. current limiting system according to claim 1, which is characterized in that the voltage collection circuit includes first resistor,
Two resistance and first capacitor；
One end of the first resistor is connected with the anode of the lithium battery group, the other end of the first resistor, described second
One end of resistance and one end of the first capacitor are connected with the input terminal of the BMS control panel；The second resistance it is another
The other end of one end and the first capacitor is connected with the negative terminal of the lithium battery group.
4. current limiting system according to claim 3, which is characterized in that the voltage collection circuit further include: 3rd resistor,
4th resistance, the 5th resistance and the second capacitor；
One end of the 3rd resistor is connected with the negative terminal of the charger, the other end of the 3rd resistor and the 4th electricity
One end of resistance is connected；The other end of 4th resistance is connected with the negative terminal of the lithium battery group；One end of 5th resistance
It is connected with the other end of the 3rd resistor, the other end of the 5th resistance is connected with compensating end；The one of second capacitor
End is connected with one end of the 5th resistance, and the other end of second capacitor is connected with the negative terminal of the lithium battery group；It is described
The other end of 3rd resistor is connected with the input terminal of the voltage collection circuit.
5. current limiting system according to claim 1, which is characterized in that the photoelectric isolating driving circuit includes high speed photo coupling
Module, Shaping Module and MOS drive module；
The input terminal of the high speed photo coupling module is connected with the output end of the BMS master control borad, the high speed photo coupling module it is defeated
Outlet is connected with the input terminal of the Shaping Module, the input terminal of the output end of the Shaping Module and the MOS drive module
It is connected, the control terminal of the MOS drive module is connected with the controlled end of the MOS switch pipe.
6. current limiting system according to claim 1, which is characterized in that further include the first filter capacitor, freewheeling diode and
Second filter capacitor；
One end of first filter capacitor is connected with the anode of the charger, the other end of first filter capacitor and institute
One end of the negative terminal and the MOS switch pipe of stating charger is connected；One end of the freewheeling diode and the charger are just
End is connected, and the other end of the freewheeling diode is connected with the other end of the MOS switch pipe；The one of second filter capacitor
End is connected with the anode of the charger, and the other end of second filter capacitor is connected with the other end of the current-limiting inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821812458.7U CN208862616U (en) | 2018-11-05 | 2018-11-05 | A kind of current limiting system of battery management |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821812458.7U CN208862616U (en) | 2018-11-05 | 2018-11-05 | A kind of current limiting system of battery management |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149727A (en) * | 2018-11-05 | 2019-01-04 | 深圳市科润达电气技术有限公司 | A kind of current limiting system and method for battery management |
| CN110212600A (en) * | 2019-05-23 | 2019-09-06 | 欣旺达电子股份有限公司 | The mobile power source of multipath charging |
| CN110571883A (en) * | 2019-09-10 | 2019-12-13 | 欣旺达电子股份有限公司 | Lithium battery charging current limiting system |
| CN114142567A (en) * | 2021-12-06 | 2022-03-04 | 珠海冠宇动力电源有限公司 | Battery management circuit and battery device |
-
2018
- 2018-11-05 CN CN201821812458.7U patent/CN208862616U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149727A (en) * | 2018-11-05 | 2019-01-04 | 深圳市科润达电气技术有限公司 | A kind of current limiting system and method for battery management |
| CN110212600A (en) * | 2019-05-23 | 2019-09-06 | 欣旺达电子股份有限公司 | The mobile power source of multipath charging |
| CN110571883A (en) * | 2019-09-10 | 2019-12-13 | 欣旺达电子股份有限公司 | Lithium battery charging current limiting system |
| CN110571883B (en) * | 2019-09-10 | 2023-05-09 | 欣旺达电子股份有限公司 | Lithium battery charging current limiting system |
| CN114142567A (en) * | 2021-12-06 | 2022-03-04 | 珠海冠宇动力电源有限公司 | Battery management circuit and battery device |
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