CN112467814A - Battery pack discharge management method and system - Google Patents
Battery pack discharge management method and system Download PDFInfo
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- CN112467814A CN112467814A CN201910847779.3A CN201910847779A CN112467814A CN 112467814 A CN112467814 A CN 112467814A CN 201910847779 A CN201910847779 A CN 201910847779A CN 112467814 A CN112467814 A CN 112467814A
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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
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention relates to a battery pack discharge management method and a system, wherein the method comprises the steps of S1, detecting whether short-circuit protection occurs after a battery pack is connected to a load; s2, if the pre-charging loop is controlled to be opened, the pre-charging loop is controlled to be closed after the battery pack is pre-charged to the preset time; s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again; s4, if yes, judging whether a load voltage is detected; s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if yes, executing steps S2 and S3 in sequence; s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs; s7, if yes, judging whether the pre-charging times meet the conditions; s8, if yes, judging the pre-charging fault of the pre-charging circuit; otherwise, the process returns to step S4 or step S6. When the battery pack is connected with a large capacitive load, the invention can accurately judge whether the battery pack is a true/false short circuit, ensure the normal power supply of the load and improve the convenience of use.
Description
Technical Field
The present invention relates to the field of battery discharge control, and more particularly, to a battery pack discharge management method and system.
Background
With the rapid development of science and technology, the requirement for battery power supply is higher and higher, and then the user pays more attention to the use safety performance of the battery. Therefore, in order to ensure the safety and reliability of the battery, the prior art is provided with a Battery Management System (BMS), which is configured to monitor and control the charging state and the discharging state of the battery in real time during the charging or discharging process of the battery, so as to prevent the occurrence of potential safety hazards or accidents caused by the overcharge or the overdischarge of the battery, etc.
When the existing battery is connected to a load (particularly a large capacitive load), a large capacitor voltage is generated at the moment of power-on, and at the moment, due to the monitoring function of the BMS, the BMS can monitor the capacitor voltage and further judge the capacitor voltage to be in a short-circuit state, and a loop for supplying power to the load is switched off according to the short-circuit state. However, in practical use, there is a false short circuit, and at this time, since the BMS cannot distinguish between a true short circuit and a false short circuit, as long as the instantaneous large capacitor voltage is detected, it is determined that the short circuit is true and the circuit for supplying power to the load from the battery is turned off, so that the load cannot normally operate, which affects normal power supply of the load and brings inconvenience to a user.
Disclosure of Invention
The present invention is directed to a battery pack discharge management method and system, which overcome the above-mentioned shortcomings in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the battery pack discharge management method is applied to a battery management system, and the battery management system comprises the following steps: the device comprises a battery pack, a control unit, a short-circuit protection unit, a current detection module, a discharge switch, a load detection unit and a pre-charging loop; the management method comprises the following steps:
s1, detecting whether short-circuit protection occurs after the battery pack is connected to the load;
s2, if yes, controlling the pre-charging loop to be opened, and controlling the pre-charging loop to be closed after the battery pack is pre-charged to a preset time;
s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again;
s4, if yes, judging whether a load voltage is detected;
s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if so, controlling the pre-charging loop to be started again, pre-charging the battery pack for a preset time, and controlling the pre-charging loop to be closed;
s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs;
s7, if yes, judging whether the pre-charging times meet the conditions;
s8, if yes, judging the pre-charging circuit to be in failure; if not, the process returns to step S4 or step S6.
In one embodiment, the step S1 includes:
s101, after the battery pack is connected to a load, the control unit controls a discharge switch to be turned on;
s102, sampling the discharge current through a current detection module to obtain a sampling current;
s103, the control unit judges whether the sampling current is larger than a short-circuit protection current threshold value or not according to the sampling current, and if yes, the short-circuit protection is judged to occur.
In one embodiment, the pre-charge circuit comprises: a pre-charging switch and a pre-charging module;
the step S2 includes:
s201, the control unit controls the pre-charging switch to be turned on so as to enable the pre-charging loop to be turned on;
s202, monitoring the pre-charging time, and controlling the pre-charging switch to be closed after the pre-charging time reaches the preset time so as to close the pre-charging loop.
In one embodiment, the step S2 further includes:
and the control unit records the pre-charging times after controlling the pre-charging switch to be turned on.
In one embodiment, the step S3 is followed by:
s3-1, if short-circuit protection does not occur, judging that the pre-charging is finished;
and S3-2, clearing the pre-charging times.
In one embodiment, if not, the determining as a true short and triggering a short protection warning includes:
and controlling the discharge switch to be closed and controlling the short-circuit protection unit to be opened so as to trigger the short-circuit protection early warning.
In one embodiment, the step S5 further includes:
and the control unit records the pre-charging times after controlling the pre-charging switch to be turned on.
In one embodiment, the step S6 is followed by:
s6-1, if short-circuit protection does not occur, judging that the pre-charging is finished;
and S6-2, clearing the pre-charging times.
In one embodiment, the determining whether the number of pre-charges satisfies the condition includes:
comparing and judging the pre-charging times with the maximum pre-charging times;
and if the pre-charging times are larger than the maximum pre-charging times, judging that the pre-charging times meet the conditions.
The present invention also provides a battery pack discharge management system, including: the device comprises a battery pack, a control unit, a short-circuit protection unit, a current detection module, a discharge switch, a load detection unit and a pre-charging loop;
the battery pack supplies power to the load when being connected to the load;
the short-circuit protection unit is used for executing short-circuit protection;
the current detection module is used for sampling the discharge current of the battery pack to obtain a sampling current;
the discharge switch is turned on or off according to the control of the control unit;
the load detection unit is used for detecting the terminal voltage of the load to obtain the load voltage;
the pre-charging circuit is used for being opened or closed according to the control of the control unit;
the control unit is configured to perform the following actions:
s1, detecting whether short-circuit protection occurs after the battery pack is connected to the load;
s2, if yes, controlling the pre-charging loop to be opened, and controlling the pre-charging loop to be closed after the battery pack is pre-charged to a preset time;
s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again;
s4, if yes, judging whether a load voltage is detected;
s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if so, controlling the pre-charging loop to be started again, pre-charging the battery pack for a preset time, and controlling the pre-charging loop to be closed;
s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs;
s7, if yes, judging whether the pre-charging times meet the conditions;
s8, if yes, judging the pre-charging circuit to be in failure; if not, the process returns to step S4 or step S6.
In one embodiment, the discharge switch comprises a MOS transistor.
In one embodiment, the pre-charge circuit comprises: a pre-charging switch and a pre-charging module;
the first end of the pre-charging switch is connected with the negative end of the battery pack and the ground, the second end of the pre-charging switch is connected with the first end of the pre-charging module, the second end of the pre-charging module is connected with the load, and the third end of the pre-charging switch is connected with the control unit.
In one embodiment, the pre-charge switch comprises a MOS transistor.
In one embodiment, the pre-charge module comprises: a plurality of resistors connected in parallel.
In one embodiment, the load detection unit includes: the circuit comprises a first resistor, a second resistor and a photoelectric coupler;
the first end connection power of first resistance, the second end connection of first resistance the control unit with optoelectronic coupler's fourth end, optoelectronic coupler's third end ground, optoelectronic coupler's second end is connected the negative terminal of load, optoelectronic coupler's first end is connected the second end of second resistance, the first end connection of second resistance the positive terminal of group battery with the positive terminal of load.
The battery pack discharge management method and the battery pack discharge management system have the following beneficial effects: the method comprises the steps of S1, detecting whether short-circuit protection occurs after the battery pack is connected to a load; s2, if the pre-charging loop is controlled to be opened, the pre-charging loop is controlled to be closed after the battery pack is pre-charged to the preset time; s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again; s4, if yes, judging whether a load voltage is detected; s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if yes, executing steps S2 and S3 in sequence; s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs; s7, if yes, judging whether the pre-charging times meet the conditions; s8, if yes, judging the pre-charging fault of the pre-charging circuit; otherwise, the process returns to step S4. The invention can accurately judge whether the power supply circuit is a true short circuit or a false short circuit when the battery pack is connected with a large capacitive load, thereby avoiding that the load can not work normally due to misjudgment, ensuring the normal power supply of the load and improving the use convenience.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a battery pack discharge management system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of an embodiment of a battery pack discharge management method provided in the present invention;
fig. 3 is a schematic flow chart of another embodiment of a battery pack discharge management method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a battery pack discharge management system according to an embodiment of the present invention is provided. The battery pack discharge management system can be used for monitoring the discharge state of the battery pack 17 in real time in the discharge process of the battery pack 17, accurately judging whether the battery pack 17 is in a true short circuit or a false short circuit when the battery pack 17 is in short circuit protection, and accordingly performing corresponding processing according to a judgment result (for example, triggering short circuit protection in the case of a true short circuit, and controlling normal power supply of the battery pack 17 in the case of a false short circuit).
Specifically, as shown in fig. 1, the battery pack discharge management system includes: the battery pack 17, the control unit 11, the short-circuit protection unit 12, the current detection module 13, the discharge switch 14(K1), the load detection unit 15, and the pre-charge circuit 16.
Wherein the battery pack 17 supplies power to the load when the load is connected. Optionally, the load may be any one of an inductive load, a resistive load, and a capacitive load, wherein the determination of the true and false short circuit in the embodiment of the present invention is mainly a determination of the capacitive load.
The short-circuit protection unit 12 is used to perform short-circuit protection. Specifically, the short-circuit protection unit 12 is controlled by the control unit 11, and when the control unit 11 determines that the power supply loop is a true short circuit, the control unit 11 controls the short-circuit protection unit 12 to be turned on to trigger short-circuit protection, so that short-circuit protection of the battery pack 17 is realized, and damage to the battery pack 17 and related components and parts due to excessive current is avoided.
The current detection module 13 is configured to sample a discharge current of the battery pack 17 to obtain a sampled current. Specifically, the current detection module 13 samples the discharge current in real time during the process of supplying power to the load by the battery pack 17, and the discharge current is transmitted to the control unit 11 and is determined by the control unit 11 according to the received sample current. Alternatively, the current detection module 13 may be implemented by a sampling resistor, and the discharge current of the battery pack 17 may be obtained by detecting the current flowing through the sampling resistor.
The discharge switch 14 is turned on or off according to the control of the control unit 11. It can be understood that when the discharge switch 14 is turned on, the discharge loop of the battery pack 17 is turned on, and the supply current output by the battery pack 17 is output from the positive terminal, passes through the load, passes through the discharge switch 14 and the current detection module 13, and returns to the negative terminal of the battery pack 17. Optionally, the discharge switch 14 includes, but is not limited to, a MOS transistor.
The load detection unit 15 is configured to detect a terminal voltage of the load to obtain a load voltage. By detecting and collecting the terminal voltage of the load and transmitting the terminal voltage to the control unit 11, the control unit 11 can judge whether the short circuit occurs according to the existence of the load voltage, and the short circuit is a true short circuit or a false short circuit. Specifically, when the short circuit is a true short circuit, the detected load voltage is zero or almost zero; when the short circuit is a false short circuit, the detected load voltage is larger, so that the true short circuit or the false short circuit can be accurately judged according to the load voltage. Alternatively, the load detection unit 15 may be implemented by a photo coupler, and when a true short circuit occurs, the photo coupler is not turned on, so that the detected load voltage is zero; when a false short circuit occurs, the photocoupler is turned on, and the control unit 11 can detect a large load voltage. Wherein, this photoelectric coupler is isolation coupler, can avoid the mutual interference of load end and group battery 17 end through adopting isolation coupler, improves the degree of accuracy that detects.
The pre-charge circuit 16 is adapted to be opened or closed according to the control of the control unit 11. Specifically, when short-circuit protection occurs, the control unit 11 controls the precharge circuit 16 to be opened; when the short-circuit protection does not occur, the control unit 11 controls the pre-charge circuit 16 to be closed. In an embodiment of the present invention, the pre-charging circuit 16 includes: a pre-charge switch 161 and a pre-charge module 162. When the pre-charge switch 161 is turned on, the pre-charge circuit 16 is turned on, and the discharge current can pass through the pre-charge module 162. When the precharge switch 161 is off, the precharge circuit 16 is off and no current flows therethrough. Optionally, the pre-charge switch 161 of the embodiment of the present invention includes, but is not limited to, a MOS transistor. Further, the pre-charge module 162 according to the embodiment of the present invention may be implemented by a parallel resistor group formed by a plurality of resistors, wherein the number of the parallel resistors may be determined according to the size of the load, and the present invention is not limited in particular.
Specifically, as shown in fig. 1, the positive terminal of the battery pack 17 is connected to the positive terminal of the load, the negative terminal of the load is connected to the second terminal of the discharge switch 14 and the second terminal of the precharge module 162, the first terminal of the discharge switch 14 is connected to the second terminal of the current detection module 13, and the first terminal of the current detection module 13 and the first terminal of the precharge switch 161 are connected to the negative terminal of the battery pack 17 and connected to Ground (GND); the third terminal of the current detection module 13 is connected to the control unit 11, the second terminal of the precharge switch 161 is connected to the first terminal of the precharge module 162, the third terminal of the precharge switch 161(K2) is connected to the control unit 11, one terminal of the short-circuit protection unit 12 is connected to the third terminal of the discharge switch 14, and the other terminal of the short-circuit protection unit 12 is connected to the control unit 11.
The load detection unit 15 includes: the circuit comprises a first resistor R1, a second resistor R2 and a photoelectric coupler.
The first end of the first resistor R1 is connected with a power supply (VCC), the second end of the first resistor R1 is connected with the fourth ends of the control unit 11 and the photoelectric coupler, the third end of the photoelectric coupler is grounded, the second end of the photoelectric coupler is connected with the negative end of a load, the first end of the photoelectric coupler is connected with the second end of the second resistor R2, and the first end of the second resistor R2 is connected with the positive end of the battery pack 17 and the positive end of the load.
Further, the control unit 11 of the embodiment of the present invention is configured to perform the following actions:
s1, detecting whether short-circuit protection occurs after the battery pack 17 is connected to a load;
s2, if yes, controlling the pre-charging circuit 16 to be started, pre-charging the battery pack 17 for a preset time, and then controlling the pre-charging circuit 16 to be closed;
s3, controlling the discharge switch 14 to be closed, and detecting whether short-circuit protection occurs again;
s4, if yes, judging whether a load voltage is detected;
s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if yes, controlling the pre-charging circuit 16 to be started again, pre-charging the battery pack 17 for a preset time, and controlling the pre-charging circuit 16 to be closed;
s6, controlling the discharge switch 14 to be closed, and detecting whether short-circuit protection occurs;
s7, if yes, judging whether the pre-charging times meet the conditions;
s8, if yes, judging the pre-charging fault of the pre-charging circuit 16; if not, the process returns to step S4.
Referring to fig. 2, a schematic flow chart of an embodiment of a battery pack discharge management method according to an embodiment of the present invention is shown. The battery pack discharge management method can be realized by the battery pack discharge management system provided by the embodiment of the invention.
Specifically, as shown in fig. 2, the battery pack discharge management method includes step S1, step S2, step S3, step S4, step S5, step S6, step S7, and step S8.
In step S1, after the battery pack 17 is loaded, it is detected whether or not short-circuit protection has occurred.
Specifically, in the process of detecting whether the short-circuit protection occurs, the discharge switch 14 may be repeatedly turned on/off for multiple times to achieve the purpose of short-circuit protection detection, where the number of times the discharge switch 14 is repeatedly turned on/off and the interval time are not specifically limited in the present invention and may be determined according to actual detection.
In step S2, if yes, the pre-charge circuit 16 is controlled to be turned on, and the pre-charge circuit 16 is controlled to be turned off after the battery pack 17 is pre-charged to the preset time.
Step S3, the discharge switch 14 is controlled to be closed, and whether short-circuit protection occurs is detected again.
Specifically, when the battery pack 17 is precharged for a preset time and the precharge circuit 16 is turned off, the discharge switch 14 needs to be controlled to be turned on, and then the system needs to be detected again whether short-circuit protection exists.
Step S4, if yes, determines whether a load voltage is detected.
Step S5, if not, determining that the short circuit is true and triggering a short circuit protection early warning; if yes, the pre-charging circuit 16 is controlled to be opened again, and the pre-charging circuit 16 is controlled to be closed after the battery pack 17 is pre-charged to the preset time.
Step S6, the discharge switch 14 is controlled to be closed, and whether short-circuit protection occurs is detected.
Specifically, when the pre-charge circuit 16 is controlled to be turned on again, the battery pack 17 is pre-charged to reach the preset time, and the pre-charge circuit 16 is turned off, the discharge switch 14 is controlled to be turned on first, and then the system is detected again whether the short-circuit protection exists.
Step S7, if yes, determine whether the number of times of precharging satisfies the condition.
Step S8, if yes, determining that the pre-charge circuit 16 is in a pre-charge failure; if not, the process returns to step S4 or step S6.
The method can effectively distinguish true short circuit and false short circuit when the battery pack 17 is connected with a capacitive load, and can also effectively pre-charge the capacitor and find the pre-charge fault in time.
Further, in order to more clearly describe the battery pack discharge management method of the present invention, as shown in fig. 3, in the embodiment of the present invention, step S1 includes:
in step S101, after the battery pack 17 is loaded, the control unit 11 controls the discharge switch 14 to be turned on.
Step S102, sampling the discharge current by the current detection module 13 to obtain a sampling current.
Step S103, the control unit 11 determines whether the sampled current is greater than the short-circuit protection current threshold, and if so, determines that short-circuit protection occurs.
It is understood that if the sampled current is smaller than the short-circuit protection current threshold, it is determined that the short-circuit protection does not occur, and at this time, the battery pack 17 is normally powered on and normally supplies power to the load.
In an embodiment of the present invention, the pre-charging circuit 16 includes: a pre-charge switch 161 and a pre-charge module 162.
Wherein, step S2 includes:
in step S201, the control unit 11 controls the precharge switch 161 to be turned on, so as to turn on the precharge circuit 16.
Step S202, monitoring the pre-charging time, and controlling the pre-charging switch 161 to close after the pre-charging time reaches a preset time, so as to close the pre-charging circuit 16.
Further, when it is determined that short-circuit protection occurs and before the precharge switch 161 is controlled to be opened, i.e., before step S201 is executed, the control unit 11 first controls the short-circuit protection unit 12 to trigger the short-circuit protection early warning, and simultaneously turns off the discharge switch 14, at which time the power supply circuit is turned off. Therefore, when the control unit 11 controls the precharge switch 161 to be opened, since the power supply circuit is disconnected, current passes through the precharge circuit 16, and the precharge circuit 16 is turned on.
In addition, when the pre-charge circuit 16 is turned on, the control unit 11 starts to monitor the time when the pre-charge circuit 16 is turned on (i.e. the pre-charge time), and controls the pre-charge switch 161 to be turned off after the pre-charge time reaches the preset time, at which time the current cannot pass through, and the pre-charge circuit 16 is turned off.
Further, step S2 further includes:
in step S203, the control unit 11 records the number of times of precharging after controlling the precharge switch 161 to be turned on. After the precharge switch 161 is turned on, the precharge circuit 16 is turned on, and the control unit 11 records the number of times of precharging, i.e. the number of times of precharging plus 1.
Further, before executing step S3, the method further includes:
the discharge switch 14 is controlled to be turned on, that is, after the pre-charge circuit 16 is turned on for a preset time, the control unit 11 controls the pre-charge switch 161 to be turned off to turn off the pre-charge circuit 16, and turns on the discharge switch 14 to allow the current to pass through the power supply circuit, and at this time, the step S3 may be continuously performed.
As shown in fig. 3, step S3 is followed by:
step S3-1, if short-circuit protection does not occur, it is determined that the pre-charging is completed.
And step S3-2, clearing the pre-charging times.
Specifically, since the number of times of precharging is increased by 1 after the precharge circuit 16 is turned on in step S203, when it is detected that short-circuit protection has not occurred in step S3, it can be determined that precharging is completed, and the battery pack 17 can normally supply power to the load, and the number of times of precharging is cleared, so that the battery pack 17 is kept normally supplying power to the load through the power supply circuit.
Further, as shown in fig. 3, if the occurrence of the short-circuit protection is detected again in step S3, in this case, step S4 may be executed to determine whether the load voltage is detected. Wherein, step S4 specifically includes: the load detection unit 15 detects the terminal voltage of the load, and if there is a voltage on the load, the photocoupler in the load detection unit 15 is turned on, so that the control unit 11 can detect the voltage.
As shown in fig. 3, in step S5, if the load voltage is not detected, the determining that the short circuit is true and triggering the short circuit protection includes: the discharge switch 14 is controlled to be closed, and the short-circuit protection unit 12 is controlled to be opened to trigger the short-circuit protection.
However, in step S5, if the load voltage is detected, it can be determined that the short circuit is false, and therefore, the control unit 11 controls the precharge switch 161 to open again, so that the current can flow through the precharge module 162, the precharge circuit 16 is opened, and the battery pack 17 can continue to supply power to the load through the precharge circuit 16. Also, the control unit 11 monitors the pre-charge time after turning on the pre-charge switch 161, controls the pre-charge circuit 16 to be turned off after the pre-charge time reaches a preset time, and controls the discharge switch 14 to be turned on again after the pre-charge circuit 16 is turned off.
Further, step S5 further includes: the control unit 11 controls the precharge switch 161 to be turned on, and then records the number of times of precharging.
As shown in fig. 3, after step S6, the method further includes:
step S6-1, if short-circuit protection does not occur, it is determined that the pre-charging is completed.
And step S6-2, clearing the pre-charging times.
It can be understood that if the short-circuit protection does not occur after the discharging switch 14 is turned on again and the power supply circuit is restarted, which indicates that the pre-charging is completed, the battery pack 17 can normally supply power to the load, so that the pre-charging times are cleared and the discharging switch 14 is kept on, so that the current can normally supply power to the load through the power supply circuit.
Further, as shown in fig. 3, in step S7, if it is detected that short-circuit protection is occurring again, at this time, the number of times of precharging is compared with the maximum number of times of precharging, and if the number of times of precharging is greater than the maximum number of times of precharging, it is determined that the number of times of precharging satisfies the condition, at this time, it indicates that a precharge failure occurs in the precharge circuit 16, that is, normal precharging cannot be performed by the precharge circuit 16, and then a precharge failure signal is output to alert the precharge failure. If the number of times of precharging is less than the maximum number of times of precharging, it indicates that the precharging circuit 16 is normal, at this time, the procedure can return to step S4 to continuously detect whether the load voltage is detected, and the process is repeated.
Optionally, the maximum number of times of precharging may be set according to the size of the capacitive load in practical applications, and the present invention is not limited in particular.
By adopting the battery pack discharge management method, the true short circuit and the false short circuit can be effectively distinguished, the load can be effectively precharged, the precharge fault can be found in time, the phenomenon that the load cannot normally work due to misjudgment is avoided, the normal power supply of the load is ensured, the use convenience is improved, and the use experience of a user and the safety, the stability and the reliability of the battery pack are improved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (15)
1. A battery pack discharge management method is applied to a battery management system, and the battery management system comprises: the device comprises a battery pack, a control unit, a short-circuit protection unit, a current detection module, a discharge switch, a load detection unit and a pre-charging loop; the management method is characterized by comprising the following steps:
s1, detecting whether short-circuit protection occurs after the battery pack is connected to the load;
s2, if yes, controlling the pre-charging loop to be opened, and controlling the pre-charging loop to be closed after the battery pack is pre-charged to a preset time;
s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again;
s4, if yes, judging whether a load voltage is detected;
s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if so, controlling the pre-charging loop to be started again, pre-charging the battery pack for a preset time, and controlling the pre-charging loop to be closed;
s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs;
s7, if yes, judging whether the pre-charging times meet the conditions;
s8, if yes, judging the pre-charging circuit to be in failure; if not, the process returns to step S4 or step S6.
2. The battery pack discharge management method according to claim 1, wherein the step S1 includes:
s101, after the battery pack is connected to a load, the control unit controls a discharge switch to be turned on;
s102, sampling the discharge current through a current detection module to obtain a sampling current;
s103, the control unit judges whether the sampling current is larger than a short-circuit protection current threshold value or not according to the sampling current, and if yes, the short-circuit protection is judged to occur.
3. The battery pack discharge management method of claim 1, wherein the pre-charge circuit comprises: a pre-charging switch and a pre-charging module;
the step S2 includes:
s201, the control unit controls the pre-charging switch to be turned on so as to enable the pre-charging loop to be turned on;
s202, monitoring the pre-charging time, and controlling the pre-charging switch to be closed after the pre-charging time reaches the preset time so as to close the pre-charging loop.
4. The battery pack discharge management method according to claim 3, wherein the step S2 further includes:
and the control unit records the pre-charging times after controlling the pre-charging switch to be turned on.
5. The battery pack discharge management method according to claim 4, further comprising, after step S3:
s3-1, if short-circuit protection does not occur, judging that the pre-charging is finished;
and S3-2, clearing the pre-charging times.
6. The battery pack discharge management method according to claim 1, wherein if not, determining a true short and triggering a short protection warning comprises:
and controlling the discharge switch to be closed and controlling the short-circuit protection unit to be opened so as to trigger the short-circuit protection early warning.
7. The battery pack discharge management method according to claim 1, wherein the step S5 further includes:
and the control unit records the pre-charging times after controlling the pre-charging switch to be turned on.
8. The battery pack discharge management method according to claim 7, further comprising, after step S6:
s6-1, if short-circuit protection does not occur, judging that the pre-charging is finished;
and S6-2, clearing the pre-charging times.
9. The battery pack discharge management method according to claim 1, wherein the determining whether the number of pre-charges satisfies a condition includes:
comparing and judging the pre-charging times with the maximum pre-charging times;
and if the pre-charging times are larger than the maximum pre-charging times, judging that the pre-charging times meet the conditions.
10. A battery pack discharge management system, comprising: the device comprises a battery pack, a control unit, a short-circuit protection unit, a current detection module, a discharge switch, a load detection unit and a pre-charging loop;
the battery pack supplies power to the load when being connected to the load;
the short-circuit protection unit is used for executing short-circuit protection;
the current detection module is used for sampling the discharge current of the battery pack to obtain a sampling current;
the discharge switch is turned on or off according to the control of the control unit;
the load detection unit is used for detecting the terminal voltage of the load to obtain the load voltage;
the pre-charging circuit is used for being opened or closed according to the control of the control unit;
the control unit is configured to perform the following actions:
s1, detecting whether short-circuit protection occurs after the battery pack is connected to the load;
s2, if yes, controlling the pre-charging loop to be opened, and controlling the pre-charging loop to be closed after the battery pack is pre-charged to a preset time;
s3, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs again;
s4, if yes, judging whether a load voltage is detected;
s5, if not, determining that the short circuit is true and triggering short circuit protection early warning; if so, controlling the pre-charging loop to be started again, pre-charging the battery pack for a preset time, and controlling the pre-charging loop to be closed;
s6, controlling the discharge switch to be closed, and detecting whether short-circuit protection occurs;
s7, if yes, judging whether the pre-charging times meet the conditions;
s8, if yes, judging the pre-charging circuit to be in failure; if not, the process returns to step S4 or step S6.
11. The battery discharge management system of claim 10, wherein the discharge switch comprises a MOS transistor.
12. The battery pack discharge management system of claim 10, wherein the pre-charge circuit comprises: a pre-charging switch and a pre-charging module;
the first end of the pre-charging switch is connected with the negative end of the battery pack and the ground, the second end of the pre-charging switch is connected with the first end of the pre-charging module, the second end of the pre-charging module is connected with the load, and the third end of the pre-charging switch is connected with the control unit.
13. The battery discharge management system of claim 12, wherein the pre-charge switch comprises a MOS transistor.
14. The battery pack discharge management system of claim 12, wherein the pre-charge module comprises: a plurality of resistors connected in parallel.
15. The battery pack discharge management system of claim 10, wherein the load detection unit comprises: the circuit comprises a first resistor, a second resistor and a photoelectric coupler;
the first end connection power of first resistance, the second end connection of first resistance the control unit with optoelectronic coupler's fourth end, optoelectronic coupler's third end ground, optoelectronic coupler's second end is connected the negative terminal of load, optoelectronic coupler's first end is connected the second end of second resistance, the first end connection of second resistance the positive terminal of group battery with the positive terminal of load.
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