CN110061478B - Battery pack disconnection protection method and system - Google Patents
Battery pack disconnection protection method and system Download PDFInfo
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- CN110061478B CN110061478B CN201910350930.2A CN201910350930A CN110061478B CN 110061478 B CN110061478 B CN 110061478B CN 201910350930 A CN201910350930 A CN 201910350930A CN 110061478 B CN110061478 B CN 110061478B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery pack disconnection protection method, which comprises the following steps: performing overvoltage discharge detection scanning on the battery pack; performing overvoltage discharge protection delay timing and broken line detection scanning based on the detected voltage being lower than the over-discharge protection threshold; based on the detection of the disconnection, suspending the overvoltage discharge protection delay timing and performing the disconnection protection delay timing; continuously detecting the voltage before the over-voltage discharge protection delay timer is full, and continuously detecting the disconnection before the disconnection protection delay timer is full; recovering the overvoltage discharge protection delay timer based on that the disconnection is not continuously detected when the disconnection protection delay timer is full; entering a discharging overvoltage protection state or a disconnection protection state based on a voltage detection result before the overvoltage discharge protection delay timer is counted and a disconnection detection result before the disconnection protection delay timer is counted. The safety of the user when the battery pack is broken is ensured in the process of using the battery pack by the user.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a method and a system for protecting a battery pack from being broken.
Background
In a multi-section lithium battery protection system, a plurality of connecting lines are arranged between the battery cell string and the protection board. When the battery pack is used for a power supply, the positive electrode and the negative electrode of the whole battery pack are connected with the protection plate by thick lines, and the other intermediate node connecting lines for detecting voltage generally use thinner signal lines. The signal lines of these intermediate nodes are relatively likely to break or open as the circuit ages. The disconnection occurs at the middle node, the voltage state of the relevant electric core cannot be accurately detected by the protection plate, and some technologies for detecting the disconnection appear in the industry aiming at the disconnection condition.
In the past, battery pack protection systems have been designed to inhibit both charging and discharging if a wire break is detected, given that the protection system is unable to determine the cell voltage status of the wire break. In the processing method, the charging is forbidden, so that the electric core disconnected with the protection board is prevented from being overcharged, and danger is generated in the charging process; the prohibition of discharge ensures that the cell voltage of the break line with the protection board is not discharged to a level lower than the level that affects the life of the battery. The above-described disconnection protection method reduces the risks during charging, while benefiting the service life of the battery itself during discharging. However, the above protection method is insufficient in terms of security protection for use by the user. For example, if a plurality of lithium battery packs in an electric vehicle, an unmanned aerial vehicle, or other equipment in operation are disconnected from a protection board in a circuit responsible for level detection, the battery packs protected according to the method can discharge without warning interruption, and the unmanned aerial vehicle can be out of control due to sudden loss of power supply, which may cause economic loss or personal injury to users or other people.
Disclosure of Invention
In view of this, the present application provides a method and a system for protecting a battery pack from disconnection.
In a first aspect, an embodiment of the present application provides a method for protecting a battery pack from a disconnection, where the method includes:
performing overvoltage discharge detection scanning on the battery pack;
performing overvoltage discharge protection delay timing and broken line detection scanning based on the detected voltage being lower than the over-discharge protection threshold;
based on the detection of the disconnection, suspending the overvoltage discharge protection delay timing and performing the disconnection protection delay timing;
continuously detecting the voltage before the over-voltage discharge protection delay timer is full, and continuously detecting the disconnection before the disconnection protection delay timer is full;
recovering the overvoltage discharge protection delay timer based on that the disconnection is not continuously detected when the disconnection protection delay timer is full;
entering a discharging overvoltage protection state or a disconnection protection state based on a voltage detection result before the overvoltage discharge protection delay timer is counted and a disconnection detection result before the disconnection protection delay timer is counted.
In an optional embodiment, the entering the discharging overvoltage protection state or the wire breakage protection state based on the voltage detection result before the overvoltage discharge protection delay timer is timed out and the wire breakage detection result before the wire breakage protection delay timer is timed out includes:
before the disconnection protection delay timer is full, the disconnection is continuously detected, the disconnection protection state is entered, the protection system prohibits charging the battery pack, and does not prohibit discharging the battery pack.
In an optional embodiment, the entering into the discharging overvoltage protection state or the wire breakage protection state based on the voltage detection result before the overvoltage discharging protection delay timer expires and the wire breakage detection result before the wire breakage protection delay timer expires further includes:
when the overvoltage discharge protection delay timer is full, the battery protection system continuously detects that the voltage is too low and enters a discharge overvoltage protection state, and the battery protection system prohibits the battery pack from discharging.
In an alternative embodiment, the disconnect protection delay time is shorter than the overvoltage discharge protection delay time.
In an optional embodiment, in the performing the overvoltage discharge protection delay timing and the disconnection detection scan based on the detected over-discharge protection threshold, the disconnection detection scan is an up-conversion disconnection detection scan.
In an optional embodiment, a method and a system for protecting a battery pack from disconnection further include:
performing line breakage detection scanning based on the detected voltage not being lower than the over-discharge protection threshold;
if the disconnection is detected, performing disconnection protection timing;
continuously detecting the disconnection before the disconnection protection timing is full, entering a disconnection protection state, and prohibiting the battery pack from being charged and the battery pack from being discharged by the protection system; and a shielding discharge overvoltage protection function.
In a second aspect, an embodiment of the present application provides a battery pack protection system, including:
the acquisition unit is used for acquiring the voltage of the battery pack and triggering overvoltage discharge protection delay timing and disconnection protection delay timing according to the acquired voltage;
a timing unit for performing overvoltage discharge protection delay timing and disconnection protection delay timing on the battery pack;
and the processing unit is used for processing the information fed back by the acquisition unit and the timing unit and triggering the battery pack to enter a disconnection protection state or a discharge overvoltage protection state according to a processing result.
The embodiment of the application has the following beneficial effects:
the method and the system for protecting the disconnection of the battery pack ensure that screening confirmation of disconnection protection detection is required before any discharge overvoltage protection action in a protection mechanism, and eliminate wrong overvoltage discharge protection caused by floating voltage caused by disconnection. According to the method provided by the embodiment of the application, the battery pack is not forbidden from discharging when entering the disconnection protection state, so that the safety of a user when the battery pack is disconnected is ensured when the user uses the battery pack.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method for protecting a battery pack from disconnection according to the present application;
fig. 2 shows a schematic structural diagram of a battery protection system according to the present application.
Detailed Description
The present application is described in further detail below with reference to specific examples, but the present application is not limited thereto. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Fig. 1 is a schematic flow chart of a battery pack disconnection protection method according to an embodiment of the present invention, as shown in fig. 1, including steps S101 to S401.
Step S101, overvoltage discharge detection scanning is performed.
Step S102, determining whether the detected voltage is lower than an over-discharge protection threshold, and if the detected voltage is not lower than the over-discharge protection threshold, executing step S201. If the detected voltage is lower than the over-discharge protection threshold, step S301 is executed.
In step S201, a line break detection scan is performed.
When the detected voltage is not lower than the over-discharge protection threshold value, the line break detection scanning is line break scanning with the conventional frequency, and at the moment, the line break scanning frequency is low, so that the power consumption of conventional work can be reduced.
Step S202 is to determine whether a wire break is detected, if a wire break is detected, step S203 is executed, and if a wire break is not detected, step S102 is executed.
Step S203, a line break detection scan at a normal frequency is performed, and normal line break delay protection timing is started.
Step S204, judging whether the disconnection is continuously detected or not until the disconnection protection delay timer is full. If the disconnection is continuously detected when the disconnection protection delay timer is expired, the process proceeds to step S401, and if the disconnection is not continuously detected when the disconnection protection delay timer is expired, the process proceeds to step S102.
When the disconnection is detected for the first time, the disconnection delay protection timing is started, and when the disconnection delay protection timing is full, the disconnection is continuously detected and then the disconnection protection state is started. It is ensured that the detection of a wire break is not an accidental situation.
Step S401, entering a disconnection protection state, and prohibiting the battery pack from being charged by the protection system and not prohibiting the battery pack from being discharged.
When the battery pack protection system is powered off, the protection system prohibits charging of the battery pack, and the battery cells which are powered off between the protection boards cannot be overcharged, so that danger is generated in the charging process. The safety of the user in the process of using the battery pack is ensured by not forbidding discharge, and accidents caused by the fact that the discharge of the battery pack is interrupted without warning are avoided.
In step S301, overvoltage discharge protection delay timing is performed, and disconnection detection scanning is performed.
Wherein, after starting the overvoltage discharge protection delay timing, the disconnection detection scanning is carried out. Preferably, an upscaled line break detection scan is performed. In order to reduce the power consumption of the conventional operation, the line breakage detection scanning frequency is low in the conventional state (namely when the cell voltage is detected to be not lower than the over-discharge protection threshold). Once it is detected that the cell voltage is lower than the over-discharge protection threshold, the line break detection scanning frequency needs to be increased in order to increase the line break detection rate to avoid the mistaken entry of the discharge over-voltage discharge protection. At the moment, the voltage of the battery pack is abnormal, and the battery pack can accept the temporary increase of power consumption of the battery pack protection system for ensuring the protection function of the system.
At the same time of starting the overvoltage discharge protection timing, the line break detection scanning of the frequency rise is started. When the voltage of the battery pack is detected to be lower than the preset over-discharge protection threshold value, the reason that the voltage value is too low at the moment cannot be judged. Therefore, before entering the discharge overvoltage protection state, it is necessary to eliminate erroneous discharge overvoltage protection caused by the floating voltage due to the disconnection. Therefore, it is necessary to start the line break detection scanning of the rising frequency at the same time as the start of the overvoltage discharge protection delay timer.
Step S302 is to determine whether a wire break is detected, if a wire break is detected, step S303 is executed, and if a wire break is not detected, step S301 is executed.
Step S303, performing frequency-up disconnection detection scanning, suspending overvoltage discharge protection delay timing, and starting disconnection protection delay timing.
In step S304, it is determined whether or not the disconnection is continuously detected until the disconnection protection delay timer is expired. Step S401 is executed if the disconnection protection delay timer is expired and step S305 is executed if the disconnection is not continuously detected.
In step S305, the overvoltage discharge protection delay timer is resumed.
And after the disconnection is detected, suspending the overvoltage discharge protection delay timing and starting the disconnection protection delay timing. Before the disconnection protection delay meter is fully recorded, the disconnection detection of the frequency increase is continuously performed. After the disconnection is detected, the overvoltage discharge protection delay timing is suspended, so that the disconnection protection detection is screened before the overvoltage discharge protection state is entered. If the overvoltage discharge protection delay timer is not suspended after a wire break is detected, the following situations may exist: after the disconnection is detected, the overvoltage discharge protection delay timer and the disconnection protection delay timer are both performed at the same time, and since the start time of the overvoltage discharge protection delay timer is earlier than the start time of the disconnection protection delay timer, that is, the overvoltage protection delay timer may be earlier than the disconnection protection delay timer to be full. The purpose of screening through disconnection protection detection before entering an overvoltage discharge protection state is not achieved.
When the disconnection is detected, the overvoltage discharge protection delay timer is suspended. And when the disconnection protection delay timer is full, the disconnection is not continuously detected, and the overvoltage discharge protection delay timer is recovered. The overvoltage discharge protection delay time and the disconnection protection delay time are not particularly limited. Preferably, the disconnection protection delay time may be set shorter than the overvoltage discharge protection delay time. Since the line breakage detection scanning of the up-conversion is performed under the condition that the detected voltage is lower than the over-discharge protection threshold value, the delay time of the line breakage protection is set to be shorter than the delay time of the over-voltage discharge protection, and the condition that the detected line breakage is not accidental when the delay time of the line breakage protection is full can be ensured. The disconnection protection delay time is set to be short, so that the abnormal state of the battery pack can be ended as soon as possible, and the battery pack enters an overvoltage protection state or a disconnection protection state.
Step S306, judging whether the voltage value is continuously detected to be too low until the overvoltage discharge protection delay timer is full. If the overvoltage discharge protection delay timer is expired, the step S307 is executed if the voltage is continuously detected to be too low, and if the overvoltage discharge protection delay timer is expired, the step S102 is executed if the voltage is not continuously detected to be too low.
If no disconnection is detected at the time of the expiration of the overvoltage protection delay time, the steps S301, S302, and S306 are executed before the expiration of the overvoltage discharge protection delay time. After step S306 is executed, if the voltage is continuously detected to be too low when the overvoltage discharge protection delay timer is expired, the discharge overvoltage protection state is entered, and the battery protection system prohibits the battery pack from discharging. If the voltage is not continuously detected to be too low when the overvoltage discharge protection delay timer is full, the disconnection detection of the battery pack is continuously performed.
Step S307, entering a discharge overvoltage protection state, and the battery protection system prohibits the battery pack from discharging.
The above embodiments are possible cases of the present invention, but are not limited to the cases included in the above embodiments.
Embodiments of the present invention provide a battery pack protection system, which may implement the disconnection protection method in the above embodiments, and the above embodiments of the disconnection protection method may be used to understand and describe the following embodiments of the battery pack protection system. Likewise, the following embodiments of the battery pack protection system may also be used to understand the above-described method embodiments.
Fig. 2 is a schematic structural diagram of a battery pack disconnection protection system according to an embodiment of the present invention, referring to fig. 2, the battery pack disconnection protection system according to the embodiment of the present invention includes:
the acquisition unit 20 is used for acquiring the voltage of the battery pack and triggering the overvoltage discharge protection timing and the disconnection protection timing according to the acquired voltage;
wherein the collecting unit 20 collects the voltage of the battery pack. Comparing the collected voltage with an over-discharge protection threshold, performing overvoltage discharge protection delay timing and disconnection detection scanning when the detected voltage value is lower than the over-discharge protection threshold, and continuously detecting the voltage of the battery pack before the overvoltage discharge protection delay timing is full; and performing line breakage detection scanning when the detected voltage value is higher than the over-discharge protection threshold value.
A timing unit 21 for performing overvoltage discharge protection delay timing and disconnection protection timing for the battery pack;
and the processing unit 22 is used for processing the information fed back by the acquisition unit 20 and the timing unit 21 and triggering the battery pack to enter a disconnection protection state or a discharge overvoltage protection state according to the processing result.
Further, the timing unit 21 in this embodiment includes a first timing unit and a second timing unit, the first timing unit is used for the overvoltage discharge protection delay timing, and the second timing unit is used for the disconnection protection delay timing. After the first and second timer units have timed out, the timer expiration information is sent to the processing unit 22. The processing unit 22 processes the received information from the acquisition unit 20 and the timing unit 21, and specifically includes continuously detecting a disconnection when the disconnection protection delay timing is full, entering a disconnection protection state, and prohibiting the battery pack from being charged and not prohibiting the battery pack from being discharged by the protection system. When the overvoltage discharge protection delay timer is full, if the disconnection is not detected and the voltage is continuously detected to be too low, the overvoltage protection state is entered, and the battery protection system prohibits the battery pack from discharging.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (7)
1. A battery pack disconnection protection method comprises the following steps:
performing overvoltage discharge detection scanning on the battery pack;
performing overvoltage discharge protection delay timing and broken line detection scanning based on the detected voltage being lower than the over-discharge protection threshold;
based on the detection of the disconnection, suspending the overvoltage discharge protection delay timing and performing the disconnection protection delay timing;
continuously detecting the voltage before the over-voltage discharge protection delay timer is full, and continuously detecting the disconnection before the disconnection protection delay timer is full;
recovering the overvoltage discharge protection delay timer based on that the disconnection is not continuously detected when the disconnection protection delay timer is full;
entering a discharging overvoltage protection state or a disconnection protection state based on a voltage detection result before the overvoltage discharge protection delay timer is counted and a disconnection detection result before the disconnection protection delay timer is counted.
2. The method of claim 1, wherein entering the discharging overvoltage protection state or the wire breakage protection state based on the voltage detection result at the time of the overvoltage discharging protection delay timer expiration and the wire breakage detection result at the time of the wire breakage protection delay timer expiration comprises:
when the disconnection protection delay timer is full, the disconnection is continuously detected, the disconnection protection state is entered, the protection system prohibits charging the battery pack, and does not prohibit discharging the battery pack.
3. The method of claim 1, wherein entering the discharging overvoltage protection state or the wire break protection state based on the voltage detection result before the overvoltage discharging protection delay timer expires and the wire break detection result before the wire break protection delay timer expires further comprises:
when the overvoltage discharge protection delay timer is full, the battery protection system continuously detects that the voltage is too low and enters a discharge overvoltage protection state, and the battery protection system prohibits the battery pack from discharging.
4. The method of claim 1, wherein the disconnect protection delay time is shorter than an overvoltage discharge protection delay time.
5. The method of claim 1, wherein the disconnection detection scan is an up-converted disconnection detection scan in performing the overvoltage discharge protection delay timing and the disconnection detection scan based on the detected voltage being below the over-discharge protection threshold.
6. The method of claim 1, further comprising:
performing line breakage detection scanning based on the detected voltage not being lower than the over-discharge protection threshold;
if the disconnection is detected, performing disconnection protection timing;
continuously detecting the disconnection before the disconnection protection timing is full, entering a disconnection protection state, and prohibiting the battery pack from being charged and the battery pack from being discharged by the protection system; and a shielding discharge overvoltage protection function.
7. A battery pack protection system based on the battery pack disconnection protection method according to claim 1, comprising:
the acquisition unit is used for acquiring the voltage of the battery pack and triggering overvoltage discharge protection delay timing and disconnection protection delay timing according to the acquired voltage;
a timing unit for performing overvoltage discharge protection delay timing and disconnection protection delay timing on the battery pack;
and the processing unit is used for processing the information fed back by the acquisition unit and the timing unit and triggering the battery pack to enter a disconnection protection state or a discharge overvoltage protection state according to a processing result.
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| CN201910350930.2A CN110061478B (en) | 2019-04-28 | 2019-04-28 | Battery pack disconnection protection method and system |
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| CN201910350930.2A CN110061478B (en) | 2019-04-28 | 2019-04-28 | Battery pack disconnection protection method and system |
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| CN110061478A CN110061478A (en) | 2019-07-26 |
| CN110061478B true CN110061478B (en) | 2022-04-15 |
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| CN111693901A (en) * | 2020-07-28 | 2020-09-22 | 南京微盟电子有限公司 | A broken string detecting system for multisection lithium cell protection chip |
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| CN107543985A (en) * | 2017-06-30 | 2018-01-05 | 西安华泰半导体科技有限公司 | A kind of more piece battery core protection board break detection circuit |
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| CN102723754B (en) * | 2012-06-01 | 2014-10-15 | 惠州市亿能电子有限公司 | Identifying circuit and identifying method of broken line of battery pack acquisition line of battery management system |
| CN105277902A (en) * | 2015-11-27 | 2016-01-27 | 中颖电子股份有限公司 | Battery abnormal-state detection circuit and battery abnormal-state detection circuit system |
| CN108732448A (en) * | 2017-04-24 | 2018-11-02 | 凹凸电子（武汉）有限公司 | Wire break detection method and broken string in battery management system release detection method |
| CN107171405A (en) * | 2017-07-12 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of battery bag with breaking protection technology |
| CN109066903B (en) * | 2018-09-20 | 2024-05-17 | 富满微电子集团股份有限公司 | Battery disconnection protection system and method |
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| WO2011021880A3 (en) * | 2009-08-21 | 2011-06-23 | 주식회사 레오모터스 | System and method for preventing excessive charging or excessive discharging of batteries |
| CN107543985A (en) * | 2017-06-30 | 2018-01-05 | 西安华泰半导体科技有限公司 | A kind of more piece battery core protection board break detection circuit |
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