CN109787314A - A kind of method, apparatus and product of BMS short-circuit protection - Google Patents
A kind of method, apparatus and product of BMS short-circuit protection Download PDFInfo
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- CN109787314A CN109787314A CN201910121714.0A CN201910121714A CN109787314A CN 109787314 A CN109787314 A CN 109787314A CN 201910121714 A CN201910121714 A CN 201910121714A CN 109787314 A CN109787314 A CN 109787314A
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Abstract
The present invention is suitable for BMS technical field more particularly to a kind of method, apparatus and product of BMS short-circuit protection, which comprises when loading access, monitors discharge current in real time；Judge whether discharge current is greater than predetermined current threshold；When if the determination result is YES, discharge switch is turned off；Discharge switch is opened after delay time T1 to charge to load；Judge whether discharge current is greater than predetermined current threshold in reaction time T2；When if the determination result is YES, discharge switch is turned off, and record turn-off number of times；Judge whether turn-off number of times is greater than preset times threshold value；When if the determination result is YES, then BMS is very short-circuit；If judging result is no, BMS is false short circuit.The invention avoids BMS access large capacitive load when triggering short-circuit protection quickly cut off discharge loop vacation short circuit, thus make BMS can not powering load, improve BMS capacitive load load capacity.
Description
Technical field
The invention belongs to BMS technical field more particularly to a kind of method, apparatus and product of BMS short-circuit protection.
Background technique
Battery management system (BATTERY MANAGEMENT SYSTEM, BMS) is the tie between battery and user, main
Wanting object is secondary cell, mainly for can be improved the utilization rate of battery, prevents battery from occurring overcharging and over-discharge,
It can be used for electric car, battery truck, robot, unmanned plane, energy storage etc..
In the prior art, method of the BMS with capacitance load capability is promoted, is usually had following several: (1) increasing short-circuit threshold value
Electric current, this method is in the real risk for occurring to improve switching damage when short circuit；(2) increase short-circuit delay time, this method exists
The risk that switching damage can be also improved when short circuit really occurs；(3) increase pre-charge circuit, but this method increase hardware at
This, it is inflexible for use, and resistance heating is serious when precharge.Especially when BMS accesses big capacitive load, due to capacitor charging
Moment can generate biggish electric current, which can trigger BMS and generate short-circuit protection, and quickly cut off discharge loop, make BMS can not
It powers to capacitive load.Therefore how under the premise of not increasing cost, by changing the control strategy of BMS, so that BMS band holds
Property load ability the technical issues of greatly promoting, being those skilled in the art's urgent need to resolve.
Summary of the invention
The embodiment of the present invention provides a kind of method of BMS short-circuit protection, it is intended to BMS when solution prevents large capacitive load from accessing
The problem of false short circuit.
The embodiments of the present invention are implemented as follows, a kind of method of BMS short-circuit protection, which comprises
When loading access, discharge current is monitored in real time；
Judge whether discharge current is greater than predetermined current threshold；
When if the determination result is YES, discharge switch is turned off；
Discharge switch is opened after delay time T1 to charge to the load；
Judge whether discharge current is greater than the predetermined current threshold in reaction time T2；
When if the determination result is YES, the discharge switch is turned off, and records the turn-off number of times；
Judge whether the turn-off number of times is greater than preset times threshold value；
When if the determination result is YES, then BMS is very short-circuit；
If judging result is no, BMS is false short circuit, returns to execute and opens discharge switch pair after delay time T1
The step of load is charged.
It is further, described that the step of whether turn-off number of times is greater than preset times threshold value judged, comprising:
Judge whether the turn-off number of times is equal to the preset times within the time of " (T1+T2) * preset times threshold value "
Threshold value；
When if the determination result is YES, then judge that the BMS is very short-circuit.
It is further, described that the step of whether turn-off number of times is greater than preset times threshold value judged, comprising:
Judge the reaction time T2 in preset times threshold value whether both less than and/or equal to the default reaction time；
When if the determination result is YES, then judge that the BMS is very short-circuit.
Further, it is described if the determination result is YES when, then after BMS is very short-circuit step, further includes:
True short-circuit signal is exported to EPLD input terminal, for feeding back short-circuit condition in the EPLD input terminal.
Further, since the reaction time T2 be opening discharge switch and charging to the load, to electricity
Stream turns off the time of the discharge switch when being greater than the predetermined current threshold.
The present invention also provides a kind of device of BMS short-circuit protection, for realizing the method for the BMS short-circuit protection,
Described device includes:
The charge switch of constant conduction in BMS power supply process；
The discharge switch to charge to the load of access BMS；
The charge switch is connected with the discharge switch, the charge switch, the discharge switch respectively with BMS just
Pole, cathode are connected, and described load one end connects the BMS anode, and the other end connects the charge switch.
The embodiment of the invention also provides a kind of lithium battery product, the device including the BMS short-circuit protection.
In the method for BMS short-circuit protection provided in an embodiment of the present invention, due to when false short circuit occurs for BMS, interval time
It is discharged automatically after T1, using load charging is given in short circuit delay Tm, after n times charge, load is full of, false short when no longer occurring
Lu Shi, the i.e. normal access BMS of load, triggering short-circuit protection quickly cuts off discharge loop when avoiding BMS access large capacitive load
Vacation short circuit, thus make BMS can not powering load, improve BMS capacitive load load capacity.
Detailed description of the invention
Fig. 1 is the method flow diagram for the BMS short-circuit protection that the embodiment of the present invention one provides；
Fig. 2 is the method flow diagram of BMS short-circuit protection provided by Embodiment 2 of the present invention；
Fig. 3 is the method flow diagram for the BMS short-circuit protection that the embodiment of the present invention three provides；
Fig. 4 is the method flow diagram for the BMS short-circuit protection that the embodiment of the present invention four provides；
Fig. 5 is the device block diagram for the BMS short-circuit protection that the embodiment of the present invention six provides；
Fig. 6 is the level signal in the BMS300 power supply process that the embodiment of the present invention six provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, when there is load access BMS, if discharge current
Greater than predetermined current threshold, then turns off discharge switch and stop charging to load, be again turned on discharge switch after delay time T1
It charges to load；When discharge current is greater than predetermined current threshold in reaction time T2, discharge switch is turned off, and record shutdown
Number is charged next time, is charged repeatedly, if turn-off number of times is greater than preset times threshold value, otherwise it is false that BMS, which is very short-circuit,
Short circuit, after charging several times, load loads normal access BMS full of no longer there are false short-circuit conditions.It can effectively avoid
Since the input capacitance momentary charge of load causes false short circuit, BMS capacitive load load capacity is improved.
Embodiment one
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, as shown in Figure 1, this method comprises the following steps:
Step S100, when loading access, discharge current is monitored in real time；
Step S200, judge whether discharge current is greater than predetermined current threshold；
Step S300, when if the determination result is YES, discharge switch is turned off；
Step S400, discharge switch is opened after delay time T1 to charge to load；
Step S500, judge whether discharge current is greater than predetermined current threshold in reaction time T2；
Step S600, when if the determination result is YES, discharge switch is turned off, and record turn-off number of times；
Step S700, judge whether turn-off number of times is greater than preset times threshold value；
Step S800, when if the determination result is YES, then BMS is very short-circuit；
Step S900, if judging result is no, BMS is false short circuit, returns to step S400.
The working principle of the above method is: when there is load access BMS, if discharge current is greater than predetermined current threshold,
It turns off discharge switch to stop charging to load, discharge switch is again turned on after delay time T1 and is charged to load；When electric discharge electricity
When stream is greater than predetermined current threshold in reaction time T2, discharge switch is turned off, and record turn-off number of times, filled next time
Electricity charges repeatedly, if turn-off number of times is greater than preset times threshold value, otherwise it is false short circuit, by filling several times that BMS, which is very short-circuit,
After electricity, load loads normal access BMS full of no longer there are false short-circuit conditions.
In the present embodiment, predetermined current threshold, delay time T1, reaction time T2 can be arranged according to practical application, preset
Frequency threshold value can also not change hard according to capacitance size setting (such as setting preset times threshold value to 10 times) in practical application
Part cost can effectively avoid since the input capacitance momentary charge of load causes false short circuit, improve BMS capacitive load band and carry energy
Power.
Embodiment two
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, as shown in Fig. 2, step S700 includes:
Step S701, judge whether turn-off number of times is equal to preset times within the time of " (T1+T2) * preset times threshold value "
Threshold value；
Step S702, when if the determination result is YES, then judge that BMS is very short-circuit.
In the present embodiment, in the specific time set according to delay time T1, reaction time T2 and preset times threshold value
In section, if turn-off number of times has reached preset times threshold value, BMS is very short circuit, has cut off discharge loop at this time, BMS stops to negative
Power supply is carried, otherwise continues to charge to load.
Embodiment three
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, as shown in figure 3, step S700 includes:
Step S703, when judging whether reaction time T2 is both less than in preset times threshold value and/or is equal to default reaction
Between；
Step S704, when if the determination result is YES, then judge that BMS is very short-circuit.
In the present embodiment, reaction time T2 is less than the default reaction time in preset times threshold value, then BMS is very short
Road, has cut off discharge loop at this time, and BMS stops otherwise continuing to charge to load to load supplying.
Example IV
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, as shown in Figure 4, further includes:
Step S1000, true short-circuit signal is exported to EPLD input terminal, for feeding back short-circuit condition in EPLD input terminal.
In the present embodiment, when BMS is very short-circuit, to EPLD ((Erasable Programmable Logic Device,
Erasable Programmadle logic device) input terminal output for by short-circuit condition feedback in the true short-circuit signal of EPLD input terminal,
EPLD carries out subsequent operation according to true short-circuit signal.
Embodiment five
The embodiment of the invention provides a kind of method of BMS short-circuit protection, reaction time T2 is from opening discharge switch pair
Load carries out charging and starts, and the time of discharge switch is turned off when being greater than predetermined current threshold to electric current.
In the present embodiment, since reaction time T2 the time of discharge switch conducting, i.e., discharged from opening discharging short circuit
Switch carries out charging to load and starts, and the time of discharge switch is turned off when being greater than predetermined current threshold to electric current.
Embodiment six
The embodiment of the invention provides a kind of devices of BMS short-circuit protection, for realizing the method for BMS short-circuit protection, such as
Shown in Fig. 5, which includes:
The charge switch 100 of constant conduction in BMS300 power supply process；
The discharge switch 200 to charge to the load 400 of access BMS300；
Charge switch 100 is connected with discharge switch 200, charge switch 100, discharge switch 200 respectively with BMS300 anode,
Cathode is connected, and 400 one end of load connection BMS300 anode, the other end connects charge switch 100.
In the present embodiment, charge switch 100, discharge switch 200 are also connected with EPLD, in real time will feed back to short-circuit condition
EPLD.When load access BMS300, if discharge current is greater than predetermined current threshold, turns off discharge switch 200 and stop to load
Charging is again turned on 200 pairs of load chargings of discharge switch after delay time T1；When discharge current is greater than in reaction time T2
When predetermined current threshold, discharge switch 200 is turned off, and record turn-off number of times, charged, charged repeatedly next time, if shutdown
Number is greater than preset times threshold value, and BMS300 is very short-circuit, is otherwise false short circuit, after charging several times, loads 400 capacitors
Full of no longer there are false short-circuit conditions, 400 normal access BMS300 are loaded.Short-circuit guarantor is carried out to BMS300 by above-mentioned apparatus
Shield, by changing the control strategy of BMS300, makes ability of the BMS300 with capacitive load significantly under the premise of not increasing cost
It is promoted, false short-circuit conditions occurs when avoiding BMS300 access large capacitive load and lead to not power to load 400.
Level signal in BMS300 power supply process is as shown in fig. 6, discharge switch 200 is connected when BMS300 powers, at this time
Output is high level signal, when load accesses BMS300, if discharge current is greater than predetermined current threshold, turns off discharge switch
200 stop charging to load, and what is exported at this time is low level signal；That is, failing edge indicates that BMS300 generation is short-circuit, disconnected
The state of open electric switch 200, rising edge indicate the state of release short circuit, conducting discharge switch 200；1,2 in figure ... n, table
Show turn-off number of times；T1 indicates delay time, the i.e. interval time of delay release short circuit；Tm indicates short circuit delay；T2 indicates reaction
Since the time be the time be connected discharging short circuit to discharge switch, i.e., since opening discharge switch and charging to load,
The time of discharge switch is turned off when being greater than predetermined current threshold to electric current.When false short circuit occurs for BMS300, when being spaced delay
Between discharged after T1 automatically, using giving load charging in short circuit delay Tm, after n times charge, load 400 capacitor and be full of, when
When false short circuit no longer occurs, the i.e. normal access BMS300 of load.
Embodiment seven
The embodiment of the invention provides a kind of lithium battery product, the device including BMS short-circuit protection.
In the present embodiment, by using the device of BMS short-circuit protection in lithium battery product, before not increasing cost
It puts, by changing the control strategy of BMS, greatly promotes BMS with the ability of capacitive load, avoid BMS and access big capacitive
False short-circuit conditions occur when load and lead to not powering load so that lithium battery properties of product are significantly promoted, preferably for
Load stabilization power supply.
The embodiment of the invention provides a kind of methods of BMS short-circuit protection, when there is load access BMS, if discharge current
Greater than predetermined current threshold, then turns off discharge switch and stop charging to load, be again turned on discharge switch after delay time T1
It charges to load；When discharge current is greater than predetermined current threshold in reaction time T2, discharge switch is turned off, and record shutdown
Number is charged next time, is charged repeatedly, if turn-off number of times is greater than preset times threshold value, otherwise it is false that BMS, which is very short-circuit,
Short circuit, after charging several times, load loads normal access BMS full of no longer there are false short-circuit conditions.It can effectively avoid
Since the input capacitance momentary charge of load causes false short circuit, BMS capacitive load load capacity is improved.Specifically, in root
In the specific period according to the setting of delay time T1, reaction time T2 and preset times threshold value, if turn-off number of times has reached pre-
If frequency threshold value, BMS is very short circuit, has cut off discharge loop at this time, and BMS stops otherwise continuing to fill load to load supplying
Electricity；Alternatively, reaction time T2 is less than the default reaction time in preset times threshold value, then BMS is very short-circuit, is cut off at this time
Discharge loop, BMS stop otherwise continuing to charge to load to load supplying.Further, defeated to EPLD when BMS is very short-circuit
Enter end output for, in the true short-circuit signal of EPLD input terminal, EPLD to carry out subsequent according to true short-circuit signal by short-circuit condition feedback
Operation.The embodiment of the present invention also provides a kind of device of BMS short-circuit protection, for realizing the method for BMS short-circuit protection, by upper
It states device and short-circuit protection is carried out to BMS, under the premise of not increasing cost, by changing the control strategy of BMS, hold BMS band
Property load ability greatly promote, false short-circuit conditions occur when avoiding BMS access large capacitive load and lead to not supply to load
Electricity.The embodiment of the invention also provides a kind of lithium battery products, by the dress for using BMS short-circuit protection in lithium battery product
It sets, so that lithium battery properties of product are significantly promoted, it is preferably load stable power-supplying.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of method of BMS short-circuit protection, which is characterized in that the described method includes:
When loading access, discharge current is monitored in real time；
Judge whether discharge current is greater than predetermined current threshold；
When if the determination result is YES, discharge switch is turned off；
Discharge switch is opened after delay time T1 to charge to the load；
Judge whether discharge current is greater than the predetermined current threshold in reaction time T2；
When if the determination result is YES, the discharge switch is turned off, and records the turn-off number of times；
Judge whether the turn-off number of times is greater than preset times threshold value；
When if the determination result is YES, then BMS is very short-circuit；
If judging result is no, BMS is false short circuit, returns to execute and opens discharge switch after delay time T1 to described negative
The step of being loaded into row charging.
2. the method for BMS short-circuit protection as described in claim 1, which is characterized in that described whether to judge the turn-off number of times
The step of greater than preset times threshold value, comprising:
Judge whether the turn-off number of times is equal to the preset times threshold value within the time of " (T1+T2) * preset times threshold value "；
When if the determination result is YES, then judge that the BMS is very short-circuit.
3. the method for BMS short-circuit protection as described in claim 1, which is characterized in that described whether to judge the turn-off number of times
The step of greater than preset times threshold value, comprising:
Judge the reaction time T2 in preset times threshold value whether both less than and/or equal to the default reaction time；
When if the determination result is YES, then judge that the BMS is very short-circuit.
4. the method for BMS short-circuit protection as described in claim 1, which is characterized in that it is described if the determination result is YES when, then
After BMS is very short-circuit step, further includes:
True short-circuit signal is exported to EPLD input terminal, for feeding back short-circuit condition in the EPLD input terminal.
5. the method for BMS short-circuit protection as described in claim 1, which is characterized in that the reaction time T2 is put from opening
Electric switch to the load carry out charging starts, to electric current be greater than the predetermined current threshold when turn off the discharge switch when
Between.
6. a kind of device of BMS short-circuit protection, for realizing the side of BMS short-circuit protection described in any one of claims 1 to 5
Method, which is characterized in that described device includes:
The charge switch of constant conduction in BMS power supply process；
The discharge switch to charge to the load of access BMS；
The charge switch is connected with the discharge switch, and the charge switch, the discharge switch are positive, negative with BMS respectively
Extremely it is connected, described load one end connects the BMS anode, and the other end connects the charge switch.
7. a kind of lithium battery product, which is characterized in that the device including BMS short-circuit protection as claimed in claim 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910121714.0A CN109787314A (en) | 2019-02-19 | 2019-02-19 | A kind of method, apparatus and product of BMS short-circuit protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910121714.0A CN109787314A (en) | 2019-02-19 | 2019-02-19 | A kind of method, apparatus and product of BMS short-circuit protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082490A (en) * | 2019-12-28 | 2020-04-28 | 杭州协能科技股份有限公司 | Short-circuit protection method |
| CN111313360A (en) * | 2020-03-03 | 2020-06-19 | 杭州艾启新能源有限公司 | Method for automatically identifying and judging reasons causing circuit overcurrent protection |
| CN111537913A (en) * | 2020-05-14 | 2020-08-14 | 广东汉力威技术有限公司 | Method for diagnosing short circuit by using pre-discharge loop |
| CN114865901A (en) * | 2022-04-26 | 2022-08-05 | 山东圣阳电源股份有限公司 | Control method, device and medium for starting inverter |
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| CN103094932A (en) * | 2011-10-28 | 2013-05-08 | 东莞钜威新能源有限公司 | Power supply system and power protection circuit thereof |
| CN105244850A (en) * | 2015-10-09 | 2016-01-13 | 深圳市沛城电子科技有限公司 | Battery protection circuit and control method therefor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103094932A (en) * | 2011-10-28 | 2013-05-08 | 东莞钜威新能源有限公司 | Power supply system and power protection circuit thereof |
| CN105244850A (en) * | 2015-10-09 | 2016-01-13 | 深圳市沛城电子科技有限公司 | Battery protection circuit and control method therefor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082490A (en) * | 2019-12-28 | 2020-04-28 | 杭州协能科技股份有限公司 | Short-circuit protection method |
| CN111313360A (en) * | 2020-03-03 | 2020-06-19 | 杭州艾启新能源有限公司 | Method for automatically identifying and judging reasons causing circuit overcurrent protection |
| CN111537913A (en) * | 2020-05-14 | 2020-08-14 | 广东汉力威技术有限公司 | Method for diagnosing short circuit by using pre-discharge loop |
| CN114865901A (en) * | 2022-04-26 | 2022-08-05 | 山东圣阳电源股份有限公司 | Control method, device and medium for starting inverter |
| CN114865901B (en) * | 2022-04-26 | 2023-10-31 | 山东圣阳电源股份有限公司 | Control method, device and medium for starting inverter |
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Application publication date: 20190521 |