CN115579999A - Battery operation management system and battery operation management method - Google Patents

Battery operation management system and battery operation management method Download PDF

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Publication number
CN115579999A
CN115579999A CN202211407334.1A CN202211407334A CN115579999A CN 115579999 A CN115579999 A CN 115579999A CN 202211407334 A CN202211407334 A CN 202211407334A CN 115579999 A CN115579999 A CN 115579999A
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module
voltage
main
discharge
battery
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CN202211407334.1A
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CN115579999B (en
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张强
张书阳
付战超
佟天野
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Suzhou Luck Power Electronics Technology Co ltd
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Suzhou Luck Power Electronics Technology Co ltd
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Priority to CN202310687620.6A priority Critical patent/CN116599187A/en
Priority to CN202310687640.3A priority patent/CN116599188A/en
Priority to CN202211407334.1A priority patent/CN115579999B/en
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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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • 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
    • H01M10/443—Methods for charging or discharging in response to temperature
    • 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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H02J7/0049—Detection of fully charged condition
    • 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
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a battery operation management system and a battery operation management method, wherein the method comprises the following steps: initializing the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to enable the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be in a disconnected state; acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken down or not, if not, controlling the pre-discharging module to be conducted, acquiring the sampling value of the voltage of the discharging cathode to judge whether the current connected load state is abnormal or not, and if so, controlling the pre-discharging module to be disconnected and controlling the main discharging module to be conducted; acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken or damaged, if not, controlling the main discharging module and the pre-charging module to be conducted, and controlling the pre-discharging module and the main charging module to be disconnected; and acquiring a sampling value of the voltage of the charging cathode to judge whether the state of the currently accessed charger is abnormal, and if the state of the currently accessed charger is normal, controlling the pre-charging module to be disconnected and controlling the main charging module to be connected.

Description

Battery operation management system and battery operation management method
Technical Field
The invention relates to the field of battery control, in particular to a battery operation management system and a battery operation management method.
Background
A BMS (Battery Management System) is a device that monitors physical quantities such as Battery temperature, voltage, and current to control charging and discharging of a Battery. The existing BMS mainly has two charging and discharging management architectures, one of which is a charging and discharging same-port structure, namely, charging and discharging are led out from a same interface, and the architecture is simple but has higher cost. The second is split, namely the charging and discharging ports are completely separated, so that the cost is low, but the charging MOS is less in quantity, and the charging MOS is easy to damage when short circuit impact is caused.
Patent 2021206988916.4 discloses a charging and discharging structure with half ports, but its charging MOS has only one directional switch, when the discharging is turned on, the charging port will directly output high voltage, and there is a risk of electric shock and ignition. And whether the load or the charging port has a short circuit or other abnormal conditions cannot be judged in advance, and the risk cannot be predicted in advance.
The above background disclosure is only used for assisting understanding of the inventive concept and technical solutions of the present invention, and it does not necessarily belong to the prior art of the present patent application, nor does it necessarily give technical teaching; the above background should not be used to assess the novelty or inventiveness of the present application in the event that there is no clear evidence that the above disclosure has been made prior to the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a comprehensive battery operation management system and a battery operation management method, which can predict the abnormal risk of a discharge loop and/or a charge loop in advance or detect the state of a discharge MOS in advance to ensure the safe operation of battery charging and discharging.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a battery operation management system for controlling a discharging operation or a charging operation of a battery, the system comprising:
the device comprises a pre-discharge module and a main discharge module which are connected in parallel, wherein the pre-discharge module and the main discharge module are respectively provided with a controllable switch;
the system comprises a pre-charging module and a main charging module which are connected in parallel, wherein the pre-charging module and the main charging module are respectively provided with a controllable switch;
the main discharging module and the battery form a discharging loop, and the main discharging module, the main charging module and the battery form a charging loop;
the system further comprises a sampling module and a control module, wherein the sampling module is configured to sample one or more of a voltage, a current, a temperature signal; the control module controls the controllable switches of the pre-discharge module, the main discharge module, the pre-charge module and the main charge module according to the adoption result of the sampling module:
if the sampling result of the sampling module meets the preset condition in the on state of the pre-discharge module, the control module controls the pre-discharge module to be disconnected and controls the main discharge module to be connected;
and/or if the sampling result of the sampling module meets the preset condition in the conduction state of the main discharging module and the pre-charging module, the control module controls the pre-charging module to be disconnected and controls the main charging module to be connected.
Further, in accordance with any one or combination of the preceding claims, the sampling module is configured to sample a discharge cathode voltage;
if the voltage sampling result at the first moment after the pre-discharge module is conducted meets the following conditions:
V 21 ≤k 1 *V 1 wherein, in the step (A),V 21 is the sampled value of the discharge cathode voltage at the first time t1,V 1 is the voltage of the battery and is,k 1 is a first proportional threshold value which is preset,k 1 is greater than or equal to 50%, the set value range of the first time t1 is 150 to 500ms;
and the voltage sampling result at the second moment after the pre-discharge module is conducted meets the following conditions:
V 22 ≤k 2 *V 1 wherein, in the step (A),V 22 is the sampled value of the discharge cathode voltage at said second time t2,V 1 is the voltage of the battery and is,k 2 is a preset second proportional threshold value,k 2 the set value of (a) is between 1% and 15%, and the set value range of the second time t2 is between 1 and 3s;
the control module controls the controllable switch of the pre-discharge module to be switched off and controls the controllable switch of the main discharge module to be switched on.
Further, any one or combination of the above technical solutions if the battery voltageV 1 Greater than or equal to 48V, the first proportional threshold valuek 1 Is between 70% and 85%, the second proportional threshold valuek 2 The set value of (b) is between 10% and 15%; if the battery voltageV 1 Greater than or equal to 24V and less than 48V, the first proportional threshold valuek 1 Is between 65% and 70%, the second proportional threshold valuek 2 The set value of (b) is between 8% and 10%; if the battery voltage isV 1 Less than 24V, the first proportional threshold valuek 1 Is between 50% and 65%, the second proportional threshold valuek 2 The set value of (a) is between 1% and 8%.
Further, in accordance with any one or combination of the preceding claims, the sampling module is configured to sample the charge cathode voltage;
if the voltage sampling result at the third moment after the main discharging module and the pre-charging module are conducted meets the following conditions:
V 31 ≤k 3 *V 1 wherein, in the step (A),V 31 for the voltage of the discharge cathode at said third instant t3The value of the sample is taken,V 1 is the voltage of the battery and is,k 3 is a preset third proportional threshold value,k 3 is greater than or equal to 50%, the set value at the third time t3 ranges from 150 to 500ms;
and the voltage sampling result at the fourth moment after the main discharging module and the pre-charging module are conducted meets the following conditions:
V 32 ≤k 4 *V 1 wherein, in the step (A),V 32 is the sampled value of the discharge cathode voltage at the fourth time t2,V 1 is the voltage of the battery and is,k 4 is a preset fourth proportional threshold value,k 4 is between 20% and 35%, the set value of the fourth time t4 ranges from 1 to 3s;
the control module controls the controllable switch of the pre-charging module to be turned off and controls the controllable switch of the main charging module to be turned on.
Further, according to any one or combination of the preceding claims, the battery voltage is measuredV 1 Greater than or equal to 48V, the third proportional threshold valuek 3 Is between 70% and 85%, the fourth proportional threshold valuek 4 Is set between 30% and 35%; if the battery voltageV 1 Greater than or equal to 24V and less than 48V, the third scaling thresholdk 3 Is between 65% and 70%, the fourth proportional threshold valuek 4 Is between 26% and 30%; if the battery voltageV 1 Less than 24V, the third proportional threshold valuek 3 Is between 50% and 65%, the fourth proportional threshold valuek 4 Is set at 20% to 26%.
Further, in accordance with any one or combination of the preceding claims, the sampling module is configured to sample a discharge cathode voltage; the control module is further configured to detect a damaged state of a controllable switch of the main discharge module before the pre-discharge module is turned on by:
if the sampling value of the discharge cathode voltage meets the following conditions:
V 23 ＜k 3 *V 1 wherein, in the step (A),V 23 is a sampling value of the discharge cathode voltage in the case where both the pre-discharge module and the main discharge module are turned off,V 1 is the voltage of the battery and is,k 3 is a preset second proportional threshold value,k 3 if the set value of the voltage is between 1% and 15%, the control module sends a signal for prompting breakdown damage of the controllable switch of the main discharging module and controls the controllable switch of the main discharging module to keep an off state.
Further, in accordance with any one or combination of aspects described herein,V 1 is the rated voltage of the battery; alternatively, the sampling module is further configured to sample a battery voltage,V 1 is a real-time sampled value of the battery voltage.
Further, in accordance with any one or combination of the above, the sampling module is configured to sample the discharge cathode voltage; the control module is also configured to detect a damaged state of a controllable switch of the main discharge module in a state that the main discharge module is controlled to be on and other modules are controlled to be off by:
if the sampling value of the discharge cathode voltage meets the following conditions:
V 24 ＞V preset wherein, in the step (A),V 24 the sampling value of the discharge cathode voltage under the conditions that the pre-discharge module is disconnected and the main discharge module is connected,V preset is a preset breaking voltage threshold, wherein,V preset if the set value of the main discharging module is between 0.4 and 3V, the control module sends out a signal for prompting the open circuit damage of the controllable switch of the main discharging module.
Further, in any one or a combination of the foregoing technical solutions, the pre-discharge module is a series branch of a first MOS switch tube and a first resistor, and the main discharge module is a second MOS switch tube; the pre-charging module is a series branch of a third MOS switch tube and a second resistor, and the main charging module is a fourth MOS switch tube;
the sampling module is an AFE sampling chip, and the control module controls the first MOS switch tube, the second MOS switch tube, the third MOS switch tube and the fourth MOS switch tube through the MOS drive circuit.
Further, in accordance with any one or a combination of multiple technical solutions described above, the sampling module is configured to detect a total current input or output by the battery, and if a current sampling value exceeds a preset current threshold range, the control module controls the pre-discharge module, the main discharge module, the pre-charge module, and the main charge module to be turned off;
and/or the sampling module is configured to detect the surface temperature of the battery or the ambient temperature of the battery, and if the temperature sampling value exceeds a preset temperature threshold range, the control module controls the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be disconnected.
According to another aspect of the present invention, there is provided a battery operation management method based on the above battery operation management system, including the following steps:
initializing the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to enable the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be in a disconnected state;
acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken down or not, if so, sending a prompt signal, and if not, continuing to execute the next step;
responding to a trigger instruction of battery discharging, controlling the pre-discharging module to be conducted, and controlling the main discharging module, the pre-charging module and the main charging module to be disconnected;
acquiring a sampling value of the voltage of the discharging cathode to judge whether the current connected load state is abnormal, if not, controlling the pre-discharging module to be disconnected and controlling the main discharging module to be connected;
acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken or damaged, if so, sending a prompt signal, and if not, continuing to execute the next step;
responding to an access instruction of the charger, controlling the main discharging module and the pre-charging module to be conducted, and controlling the pre-discharging module and the main charging module to be disconnected;
and acquiring a sampling value of the voltage of the charging cathode to judge whether the state of the currently accessed charger is abnormal, and if not, controlling the disconnection of the pre-charging module and controlling the conduction of the main charging module.
Further, in view of any one or a combination of the foregoing technical solutions, if the voltage sampling result at the first time after the pre-discharge module is turned on meets the following condition:V 21 ≤k 1 *V 1 wherein, in the step (A),V 21 is the sampled value of the discharge cathode voltage at the first time t1,V 1 is the voltage of the battery and is,k 1 is a first proportional threshold value which is preset,k 1 is greater than or equal to 50%, the set value at the first time t1 ranges from 150 to 500ms;
and the voltage sampling result at the second moment after the pre-discharge module is conducted meets the following conditions:V 22 ≤k 2 *V 1 wherein, in the step (A),V 22 is the sampled value of the discharge cathode voltage at the second time t2,V 1 is the voltage of the battery and is,k 2 is a preset second proportional threshold value,k 2 the set value of (a) is between 1% and 15%, and the set value range of the second time t2 is between 1 and 3s;
then it is determined that the currently accessed load state is not abnormal.
Further, in view of any one or a combination of the foregoing technical solutions, if the voltage sampling result at the third time after the main discharging module and the pre-charging module are turned on meets the following condition:V 31 ≤k 3 *V 1 wherein, in the step (A),V 31 is the sampled value of the discharge cathode voltage at the third time t3,V 1 is the voltage of the battery and is,k 3 is a preset third proportional threshold value,k 3 is greater than or equal to 50%, the set value at the third time t3 ranges from 150 to 500ms;
and the voltage sampling result at the fourth moment after the main discharging module and the pre-charging module are conducted meets the following conditions:V 32 ≤k 4 *V 1 wherein, in the step (A),V 32 is the sampled value of the discharge cathode voltage at the fourth time t2,V 1 is the voltage of the battery and is,k 4 is a preset fourth proportional threshold value,k 4 is between 20% and 35%, and the set value of the fourth time t4 ranges from 1 to 3s;
it is determined that the state of the currently accessed charger is not abnormal.
Further, in view of any one or a combination of the foregoing technical solutions, if the sampling value of the discharge cathode voltage satisfies the following condition:V 23 ＜k 3 *V 1 wherein, in the step (A),V 23 is a sampling value of the discharge cathode voltage in the case where both the pre-discharge module and the main discharge module are turned off,V 1 is the voltage of the battery and is,k 3 is a preset second proportional threshold value and is,k 3 if the set value of the main discharging module is between 1% and 15%, the breakdown damage of the controllable switch of the main discharging module is judged;
and/or if the sampling value of the discharge cathode voltage meets the following conditions:V 24 ＞V preset wherein, in the process,V 24 is a sampling value of the voltage of the discharge cathode under the conditions that the pre-discharge module is disconnected and the main discharge module is connected,V preset is a preset breaking voltage threshold, wherein,V preset is provided withAnd if the constant value is between 0.4 and 3V, judging that the controllable switch of the main discharging module is broken and damaged.
Further, in light of any one or a combination of multiple technical solutions, the battery operation management method further includes monitoring one or more of voltage, current, and temperature parameters of the battery in real time during the battery operation process, and if the monitored parameters reach a protection critical threshold, turning off the pre-discharge module, the main discharge module, the pre-charge module, and the main charge module; and if yes, closing the pre-discharge module, the main discharge module, the pre-charge module and the main charge module, and entering a standby mode until the standby timing overflows, and then shutting down and sleeping the BMS.
The technical scheme provided by the invention has the following beneficial effects:
a. by adding the pre-discharge module and setting the secondary pre-discharge judgment, the load state can be accurately judged in advance, the false starting probability of the discharge switch is reduced, and the reliability of the BMS is improved;
b. by adding the pre-charging module and setting secondary pre-charging judgment, the state of the port of the charger can be accurately judged in advance, the probability of false opening of a charging switch is reduced, and the reliability of the BMS is improved;
c. and performing performance detection on the discharge MOS, ensuring that the discharge MOS has no breakdown damage before starting discharge, and ensuring that the discharge MOS has no open circuit damage before starting charge.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a framework of a battery operation management system according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a battery operation management system provided in an exemplary embodiment of the present invention;
fig. 3 is a schematic management flow diagram of a battery operation management system according to an exemplary embodiment of the present invention;
fig. 4 is a logic diagram of switching control of a MOS transistor by a battery operation management system according to an exemplary embodiment of the present invention;
fig. 5 is a pre-discharge detection flowchart of a battery operation management system according to an exemplary embodiment of the present invention;
fig. 6 is a flow chart illustrating a pre-charge detection of a battery operation management system according to an exemplary embodiment of the present invention;
fig. 7 is a discharge MOS failure detection flowchart of a battery operation management system according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In one embodiment of the present invention, there is provided a battery operation management system for controlling a discharging operation or a charging operation of a battery, referring to fig. 1, the system including:
the device comprises a pre-discharge module and a main discharge module which are connected in parallel, wherein the pre-discharge module and the main discharge module are respectively provided with a controllable switch;
the system comprises a pre-charging module and a main charging module which are connected in parallel, wherein the pre-charging module and the main charging module are respectively provided with a controllable switch;
the main discharging module and the battery form a discharging loop, and the main discharging module, the main charging module and the battery form a charging loop; as shown in fig. 1, the battery positive electrode is both a discharging positive electrode and a charging positive electrode, which are collectively called charging and discharging positive electrodes, one end of the discharging module is connected with the battery negative electrode, and the other end is configured to be connected with a load, which is called a discharging negative electrode; one end of the charging module is connected with the discharging module, and the other end is configured to be connected with a charger, and the end is called as a charging cathode.
The system further comprises a sampling module and a control module, wherein the sampling module is configured to sample one or more of a voltage, a current, a temperature signal; the control module controls controllable switches of the pre-discharge module, the main discharge module, the pre-charge module and the main charge module according to the sampling result of the sampling module, wherein the controllable switches can be MOSFETs, relays and the like, in this embodiment, the MOSFET type is taken as an example, specifically as shown in fig. 2, the pre-discharge module is a series branch of a first MOS switch tube Q1 and a first resistor R1, and the main discharge module is a second MOS switch tube Q2; the pre-charging module is a series branch of a third MOS switch tube Q3 and a second resistor R2, and the main charging module is a fourth MOS switch tube Q4; in one embodiment as shown in fig. 2, a fifth MOS switch Q5 is disposed between the main discharging module and the main charging module, and the body diode of the fifth MOS switch Q5 is in a unidirectional conduction direction from the main charging module to the main discharging module, so that when the main charging module (i.e. the fifth MOS switch Q5) is turned off, the pre-charging module (i.e. the third MOS switch Q3) is turned on, i.e. turned on to the main discharging module through the body diode of the fifth MOS switch Q5.
The pre-discharge module is used for detecting whether the discharge port has short circuit or overload before discharge, and if the discharge port has abnormal conditions, the main discharge module is not started, so that the main discharge module starts discharge after the pre-discharge detection is passed. Even if the discharge port has a short circuit or an overload, the first resistor R1 is connected in series with the first MOS switch tube Q1, and the first resistor R1 plays a role in limiting current and can protect the switch tube Q1.
The pre-charging module is used for detecting whether faults such as short circuit exist in the charging port before charging, and if the faults exist, the main charging module is not started, so that the charging module allows charging after pre-charging detection is passed. Even if the charging port has a short circuit or overload, the second resistor R2 plays a role of limiting current and can protect the switch tube Q3 because the second resistor R2 is connected in series with the third MOS switch tube Q3.
The sampling module can be an AFE sampling chip or other detection devices capable of realizing signal adoption, and the control module (which can be an MCU) is connected with the AFE sampling chip to receive sampling signals of the control module and controls the first MOS switching tube Q1, the second MOS switching tube Q2, the third MOS switching tube Q3 and the fourth MOS switching tube Q4 through the MOS driving circuit.
The flow chart of the battery operation management method of the battery operation management system is shown in fig. 3: after a Battery Management System (BMS) is started, whether the Battery voltage and the Battery temperature are abnormal or not is checked, and if a Battery voltage sampling value exceeds a normal voltage range or a Battery temperature sampling value exceeds a normal temperature range, all MOS switch tubes are immediately controlled to be turned off and an alarm is issued.
If the sampling values of the battery voltage and the battery temperature are both within the normal range, next step, whether a shutdown signal exists is judged (generally triggered manually by a user), if the shutdown signal does not have any computer signal, a pre-discharge module can be started (a first MOS switch tube Q1 is closed), pre-discharge detection is carried out (a specific detection method is described in detail below), if the pre-discharge detection passes, the current connected load is normal (no discharge port is in no-load or short circuit), the pre-discharge module can be disconnected, and a main discharge module is started (the first MOS switch tube Q1 is changed from closed to open, and the second MOS switch tube Q2 is changed from open to closed).
At this time, that is, under the condition that the first MOS switch tube Q1 is turned off and the second MOS switch tube Q2 is turned on, if the charger is connected and the full charge flag is false, the charging is considered to be allowed, or the current battery temperature is further detected, and whether the charging is allowed or not is judged (the charging is not allowed if the temperature exceeds the standard). Under the condition of allowing charging, the pre-charge module is started, that is, the third MOS switch tube Q3 is opened, at this time, the second MOS switch tube Q2 remains closed, the main charge module is disconnected, and pre-charge detection is performed (a specific detection method is described in detail below), if the pre-charge detection is passed, it is described that the currently accessed charger is normal (there is no condition of overload or short circuit of the charge port), the pre-charge module may be disconnected and the main charge module is started (the third MOS switch tube Q3 is changed from closed to open, the fourth MOS switch tube Q4 is changed from open to closed), the second MOS switch tube Q2 remains in a closed state, and the fifth MOS switch tube Q5 also changes to a closed state. In the charging process, whether the battery is full is detected in real time, if the battery is full, the full flag is set to True (if the charging flag is detected to be True when the charger is accessed), the pre-charging module is closed, namely the third MOS switch tube Q3 is disconnected, and at the moment, the main charging module is also disconnected. If the battery is not fully charged, parameters such as voltage, current and temperature of the battery are monitored in real time in the charging process, if the parameters reach a protection critical threshold value, all MOS switching tubes are closed, an alarm is given out or the battery is shut down and dormant, and if the parameters do not reach the protection critical threshold value, a signal for judging whether the battery is related is returned.
If a shutdown signal (generally triggered manually by a user), all the MOS switching tubes are closed, and a standby mode is entered, if the standby timing overflows, the shutdown is dormant, and if the standby timing does not overflow, whether a relevant machine signal exists or not is judged.
If the pre-discharge detection is not passed or the pre-charge detection is not passed, all MOS switching tubes are closed, and an alarm signal is sent or the device is shut down and dormant.
The method of pre-amplification detection is described below: if the sampling result of the sampling module meets the preset condition in the on state of the pre-discharge module, the control module controls the pre-discharge module to be disconnected and controls the main discharge module to be connected, as shown in fig. 5 specifically:
the sampling module is configured to sample a discharge cathode voltage; if the voltage sampling result at the first moment after the pre-discharge module is conducted meets the following conditions:V 21 ≤k 1 *V 1 wherein, in the step (A),V 21 is the sampled value of the discharge cathode voltage at the first time t1,V 1 is the voltage of the battery and is,k 1 is a first proportional threshold value which is preset,k 1 is greater than or equal to 50%, the set value at the first time t1 ranges from 150 to 500ms;
and the voltage sampling result at the second moment after the pre-discharge module is conducted meets the following conditions:V 22 ≤k 2 *V 1 wherein, in the step (A),V 22 is the sampled value of the discharge cathode voltage at the second time t2,V 1 is the voltage of the battery and is,k 2 is a preset second proportional threshold value,k 2 the set value of (a) is between 1% and 15%, and the set value range of the second time t2 is between 1 and 3s;
the control module controls the controllable switch of the pre-discharge module to be switched off and controls the controllable switch of the main discharge module to be switched on.
One of the ideas of the invention is that secondary pre-discharge judgment is carried out at different moments, so that the accuracy of pre-discharge detection is improved, and the false turn-on probability of a discharge switch is reduced, namely, in the secondary pre-discharge judgment, if any condition is not met, a main discharge module cannot be turned on.
On one hand, the rated voltage of the battery itself is high and low, on the other hand, the voltage of the same battery at different discharge stages also changes, and through tests, for higher battery voltage, a higher first proportional threshold needs to be setk 1 And a second proportional thresholdk 2 In one embodiment, if the battery voltage is lowV 1 Greater than or equal to 48V, the first proportional threshold valuek 1 Is between 70% and 85%, the second proportional threshold valuek 2 The set value of (b) is between 10% and 15%; if the battery voltageV 1 Greater than or equal to 24V and less than 48V, the first proportional threshold valuek 1 Is between 65% and 70%, the second proportional threshold valuek 2 The set value of (b) is between 8% and 10%; if the battery voltage isV 1 Less than 24V, the first proportional threshold valuek 1 Is between 50% and 65%, the second proportional threshold valuek 2 The set value of (a) is between 1% and 8%.
The method of pre-charge detection is described as follows: if the sampling result of the sampling module meets the preset condition in the on state of the main discharging module and the pre-charging module, the control module controls the pre-charging module to be switched off and controls the main charging module to be switched on, as shown in fig. 6:
the sampling module is configured to sample a charge cathode voltage; if the voltage sampling result at the third moment after the main discharging module and the pre-charging module are conducted meets the following conditions:V 31 ≤k 3 *V 1 wherein, in the step (A),V 31 is the sampled value of the discharge cathode voltage at the third time t3,V 1 is the voltage of the battery and is,k 3 is a preset third proportional threshold value,k 3 is greater than or equal to 50%, the set value range of the third time t3 is 150 to 500ms;
and the voltage sampling result at the fourth moment after the main discharging module and the pre-charging module are conducted meets the following conditions:V 32 ≤k 4 *V 1 wherein, in the process,V 32 is the sampled value of the discharge cathode voltage at the fourth time t2,V 1 is the voltage of the battery and is,k 4 is a preset fourth proportional threshold value,k 4 is between 20% and 35%, the set value of the fourth time t4 ranges from 1 to 3s;
the control module controls the controllable switch of the pre-charging module to be turned off and controls the controllable switch of the main charging module to be turned on.
The invention also has the other conception that the secondary pre-charging judgment is carried out at different moments, the accuracy of the pre-charging detection is improved, and the false opening probability of the charging switch is reduced, namely, in the secondary pre-charging judgment, the main charging module cannot be started when any condition is not met.
On one hand, the rated voltage of the battery itself has high and low values, on the other hand, the voltage of the same battery in different charging stages also changes, and through tests, for higher battery voltage, a higher third proportional threshold needs to be setk 3 And a fourth proportional thresholdk 4 In one embodiment, if the battery voltage is lowV 1 Greater than or equal to 48V, the third proportional threshold valuek 3 Is between 70% and 85%, the fourth proportional threshold valuek 4 Is set between 30% and 35%; if the battery voltage isV 1 Greater than or equal to 24V and less than 48V, the third proportional threshold valuek 3 Is between 65% and 70%, and the fourth proportional threshold valuek 4 Is between 26% and 30%; if the battery voltage isV 1 Less than 24V, the third proportional threshold valuek 3 Is between 50% and 65%, the fourth proportional threshold valuek 4 Is set at 20% to 26%.
In a specific embodiment of the present invention, the sampling module is further configured to sample the discharge cathode voltage; the control module is further configured to detect a damaged state of the controllable switch of the main discharge module before the pre-discharge module is turned on, in a manner shown in fig. 7:
if the sampling value of the discharge cathode voltage meets the following conditions:V 23 ＜k 3 *V 1 wherein, in the step (A),V 23 is a sampling value of the discharge cathode voltage under the condition that the pre-discharge module and the main discharge module are both disconnected,V 1 is the voltage of the battery and is,k 3 is a preset second proportional threshold value,k 3 if the set value of the main discharging module is between 1% and 15%, the control module sends a signal for prompting breakdown damage of the controllable switch of the main discharging module and controls the controllable switch of the main discharging module to keep a disconnected state.
The control module is further configured to detect a damaged state of a controllable switch of the main discharge module in a state that the main discharge module is controlled to be on and other modules are controlled to be off, as shown in fig. 7, by:
if the sampling value of the discharge cathode voltage meets the following conditions:
V 24 ＞V preset wherein, in the process,V 24 is a sampling value of the voltage of the discharge cathode under the conditions that the pre-discharge module is disconnected and the main discharge module is connected,V preset is a preset breaking voltage threshold, wherein,V preset if the set value of the main discharging module is between 0.4 and 3V, the control module sends a signal for prompting the breakage of the controllable switch of the main discharging module.
In the embodiments or combinations of the embodiments described above,V 1 is the rated voltage of the battery; alternatively, the sampling module is further configured to sample the battery voltage (first voltage acquisition in FIG. 2),V 1 a real-time sample value of the battery voltage; the voltage of the charge and discharge anode can be collected to ensure that the battery can not be charged over-voltage or over-discharge.
The embodiment is as follows:
taking a battery with a rated voltage of 48V as an example, the above-mentioned breakdown damage detection, pre-discharge detection, discharge MOS open-circuit damage, and pre-charge detection of the discharge MOS are taken as management methods of the management system, as shown in fig. 4:
in an initial state, the MOS Q1-Q5 are all in an off state, and at this time, it can be detected whether the MOS Q2 in the main discharge module is broken down or not, and the detection principle is as follows: under the condition that the discharging MOS is normal, the discharging cathode is charged through a load, the voltage of the discharging cathode is increased under the normal condition, and if the voltage of the discharging cathode is sampled to be less than 5V at the moment, the fact that the MOS Q2 is actually in a conducting state under an off state is indicated, namely, the breakdown damage of the MOS Q2 is estimated.
If the breakdown damage does not occur to the MOS Q2, the pre-discharge detection is performed, that is, only the MOS Q1 of the pre-discharge module is turned on first, and the current direction is the battery positive electrode (charge and discharge positive electrode) → load → discharge negative electrode → R1 → Q1 → R3 → battery negative electrode in fig. 2. If the result V2 of the second voltage acquisition is equal to the result V1 of the first voltage acquisition, the discharging port is in short circuit; if the result V2 of the second voltage acquisition is 0, the port is unloaded; if V2 is less than V1, a load exists in the port, a threshold voltage VT1 is set, the VT1 meets the condition that the VT1 is less than the battery voltage (between 50 percent and 85 percent of the battery voltage), and the voltage of a discharging cathode 300ms after the Q1 of the collecting switch tube is conductedV 21 By judgmentV 21 And VT1, it can be determined whether there is a short circuit at the discharge port: if it isV 21 If VT1 is larger, short circuit is caused, alarm is directly given, Q1 and Q2 are closed, and discharge is forbidden; if it isV 21 VT1 or less, then there is no short circuit at present, and the discharging cathode voltage of 2s after the switch tube Q1 is conducted is sampled againV 22 If at allV 22 And (4) V1 is less than or equal to 10, the pre-discharge is allowed to be closed, the main discharge is started, namely Q2 is switched on, Q1 is switched off, and the battery is allowed to discharge through Q2.
And next, detecting whether the MOS Q2 in the main discharge module is broken or not, wherein the detection principle is as follows: after the second MOS switch tube Q2 is switched on, the voltage value of the discharging cathode is collected, under the condition that the discharging MOS is normally switched on, the voltage of the discharging cathode should be close to 0V, and if the voltage of the discharging cathode is sampled to be larger than 1V (or 0.4V), the situation that the MOS Q2 is actually in an open circuit state under the closed state is indicated, namely, the situation that the MOS Q2 is broken and damaged is estimated.
If MOS Q2 is not broken, then enter into pre-charge detection, pre-charge detectionThis is done after the pre-discharge detection passes (i.e., Q2 has been turned on), and if the pre-discharge detection does not pass, the pre-charge detection is not performed. That is, MOS Q2 and Q3 are in a conducting state, and the principle that the pre-charging module detects whether the charging port is short-circuited is as follows: before charging, the lead is connected with Q3, and the direction of the current is battery positive electrode (charge and discharge positive electrode) → charger → charging negative electrode → R2 → Q3 → Q5 body diode → Q2 → R3 → battery negative electrode. If the result V3 of the third voltage acquisition is equal to the result V1 of the first voltage acquisition, the charging port is short-circuited; if the result V3 of the third voltage acquisition is 0, the port is unloaded; if V3 is less than V1, a load exists on the port, a threshold voltage VT2 is set, the VT2 meets the condition that the VT2 is less than the battery voltage (between 50% and 85% of the battery voltage), and the charging negative electrode voltage of 300ms after the Q2 and the Q3 are conducted is collectedV 31 By judgmentV 31 And VT2, it can be determined whether there is a short circuit at the charging port: if it isV 31 If the voltage is more than VT2, short circuit is caused, direct alarm is given, Q1 and Q2 are closed, and charging is forbidden; if it isV 31 VT2 or less, then there is no short circuit at present, and the charge cathode voltage 2s after the Q2 and Q3 switch-on is sampledV 32 If, ifV 32 And (4) V1 is less than or equal to 30, the pre-charging is allowed to be closed, the main charging is started, namely Q2, Q4 and Q5 are switched on, Q3 is switched off, and the battery is allowed to be charged through Q4 and Q5.
Monitoring parameters such as voltage, current and temperature of the battery in real time in the charging process, monitoring whether the battery is fully charged, and controlling Q3, Q4 and Q5 to be disconnected if the battery is fully charged; and if the parameters are detected to exceed the protection critical threshold, all the MOS switching tubes are closed, and an alarm is given or the device is shut down and dormant.
It should be noted that, in this document, relational terms such as first and second, and the like do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (15)

1. A battery operation management system for controlling a discharging operation or a charging operation of a battery, the system comprising:
the device comprises a pre-discharge module and a main discharge module which are connected in parallel, wherein the pre-discharge module and the main discharge module are respectively provided with a controllable switch;
the system comprises a pre-charging module and a main charging module which are connected in parallel, wherein the pre-charging module and the main charging module are respectively provided with a controllable switch;
the main discharging module and the battery form a discharging loop, and the main discharging module, the main charging module and the battery form a charging loop;
the system further comprises a sampling module and a control module, wherein the sampling module is configured to sample one or more of a voltage, a current, a temperature signal; the control module controls the controllable switches of the pre-discharge module, the main discharge module, the pre-charge module and the main charge module according to the adoption result of the sampling module:
if the sampling result of the sampling module meets the preset condition in the on state of the pre-discharge module, the control module controls the pre-discharge module to be disconnected and controls the main discharge module to be connected; and/or the presence of a gas in the gas,
if the sampling result of the sampling module meets the preset condition in the conduction state of the main discharging module and the pre-charging module, the control module controls the pre-charging module to be disconnected and controls the main charging module to be conducted.
2. The battery operation management system of claim 1, wherein the sampling module is configured to sample a discharge cathode voltage;
if the voltage sampling result at the first moment after the pre-discharge module is conducted meets the following conditions:
V 21 ≤k 1 *V 1 wherein, in the process,V 21 as a sampling value of the discharge cathode voltage at the first time t1,V 1 is the voltage of the battery and is,k 1 is a first proportional threshold value which is preset,k 1 is greater than or equal to 50%, the set value range of the first time t1 is 150 to 500ms;
and the voltage sampling result at the second moment after the pre-discharge module is conducted meets the following conditions:
V 22 ≤k 2 *V 1 wherein, in the step (A),V 22 is the sampled value of the discharge cathode voltage at the second time t2,V 1 is the voltage of the battery and is,k 2 is a preset second proportional threshold value,k 2 the set value of (a) is between 1% and 15%, and the set value range of the second time t2 is between 1 and 3s;
the control module controls the controllable switch of the pre-discharge module to be switched off and controls the controllable switch of the main discharge module to be switched on.
3. The battery operation management system of claim 2, wherein the battery voltage is determined if the battery voltage is lowV 1 Greater than or equal to 48V, the first proportional threshold valuek 1 Is between 70% and 85%, and a second proportional thresholdk 2 Is between 10% and 15%; if the battery voltageV 1 Greater than or equal to 24V and less than 48V, the first proportional threshold valuek 1 Is between 65% and 70%, and a second proportional thresholdk 2 The set value of (b) is between 8% and 10%; if the battery voltage isV 1 Less than 24V, the first proportional threshold valuek 1 Is between 50% and 65%, and a second proportional thresholdk 2 The set value of (b) is between 1% and 8%.
4. The battery operation management system of claim 1, wherein the sampling module is configured to sample a charge cathode voltage;
if the voltage sampling result at the third moment after the main discharging module and the pre-charging module are conducted meets the following conditions:
V 31 ≤k 3 *V 1 wherein, in the step (A),V 31 as a sampled value of the discharge cathode voltage at the third time t3,V 1 is the voltage of the battery and is,k 3 is a preset third proportional threshold value,k 3 is greater than or equal to 50%, the set value at the third time t3 ranges from 150 to 500ms;
and the voltage sampling result at the fourth moment after the main discharging module and the pre-charging module are conducted meets the following conditions:
V 32 ≤k 4 *V 1 wherein, in the step (A),V 32 as a sampling value of the discharge cathode voltage at the fourth time t2,V 1 is the voltage of the battery and is,k 4 is a preset fourth proportional threshold value,k 4 is between 20% and 35%, the set value of the fourth time t4 ranges from 1 to 3s;
the control module controls the controllable switch of the pre-charging module to be turned off and controls the controllable switch of the main charging module to be turned on.
5. The battery operation management system of claim 4, wherein the battery voltage is determined if the battery voltage is lowV 1 Greater than or equal to 48V, then the third proportional thresholdk 3 Is between 70% and 85%, and a fourth proportional thresholdk 4 Is set between 30% and 35%; if the battery voltageV 1 Greater than or equal to 24V and less than 48V, then the third proportional threshold valuek 3 Is between 65% and 70%, and a fourth proportional thresholdk 4 Is between 26% and 30%; if the battery voltageV 1 Less than 24V, the third proportional threshold valuek 3 Is between 50% and 65%, and a fourth proportional thresholdk 4 Is set at 20% to 26%.
6. The battery operation management system of claim 1, wherein the sampling module is configured to sample a discharge cathode voltage; the control module is further configured to detect a damaged state of a controllable switch of the main discharge module before the pre-discharge module is turned on by:
if the sampling value of the discharge cathode voltage meets the following conditions:
V 23 ＜k 3 *V 1 wherein, in the step (A),V 23 is a sampling value of the discharge cathode voltage in the case where both the pre-discharge module and the main discharge module are turned off,V 1 is the voltage of the battery and is,k 3 is a preset second proportional threshold value,k 3 if the set value of the main discharging module is between 1% and 15%, the control module sends a signal for prompting breakdown damage of the controllable switch of the main discharging module and controls the controllable switch of the main discharging module to keep a disconnected state.
7. The battery operation management system according to any one of claims 2 to 6,V 1 is the rated voltage of the battery; alternatively, the sampling module is further configured to sample the battery voltage,V 1 is a real-time sampled value of the battery voltage.
8. The battery operation management system of claim 1, wherein the sampling module is configured to sample a discharge cathode voltage; the control module is also configured to detect a damaged state of a controllable switch of the main discharge module in a state that the main discharge module is controlled to be on and other modules are controlled to be off by:
if the sampling value of the voltage of the discharge cathode meets the following conditions:
V 24 ＞V preset wherein, in the process,V 24 the sampling value of the discharge cathode voltage under the conditions that the pre-discharge module is disconnected and the main discharge module is connected,V preset is a predetermined breakdown voltage threshold, wherein,V preset if the set value of the main discharging module is between 0.4 and 3V, the control module sends a signal for prompting the breakage of the controllable switch of the main discharging module.
9. The battery operation management system according to claim 1, wherein the pre-discharge module is a series branch of a first MOS switch tube and a first resistor, and the main discharge module is a second MOS switch tube; the pre-charging module is a series branch of a third MOS switch tube and a second resistor, and the main charging module is a fourth MOS switch tube;
the sampling module is an AFE sampling chip, and the control module controls the first MOS switching tube, the second MOS switching tube, the third MOS switching tube and the fourth MOS switching tube through the MOS driving circuit.
10. The battery operation management system according to claim 1, wherein the sampling module is configured to detect a total current input or output by the battery, and the control module controls the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be turned off if a current sampling value exceeds a preset current threshold range; and/or the presence of a gas in the gas,
the sampling module is configured to detect the surface temperature of the battery or the ambient temperature of the battery, and if the temperature sampling value exceeds a preset temperature threshold range, the control module controls the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be disconnected.
11. A battery operation management method based on the battery operation management system according to claim 1, comprising the steps of:
initializing a pre-discharge module, a main discharge module, a pre-charge module and a main charge module to enable the pre-discharge module, the main discharge module, the pre-charge module and the main charge module to be in a disconnected state;
acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken down or not, if so, sending a prompt signal, and if not, continuing to execute the next step;
responding to a trigger instruction of battery discharging, controlling the pre-discharging module to be conducted, and controlling the main discharging module, the pre-charging module and the main charging module to be disconnected;
acquiring a sampling value of the voltage of the discharging cathode to judge whether the current connected load state is abnormal, if not, controlling the pre-discharging module to be disconnected and controlling the main discharging module to be connected;
acquiring a sampling value of the voltage of the discharging cathode to judge whether a controllable switch of the main discharging module is broken or damaged, if so, sending a prompt signal, and if not, continuing to execute the next step;
responding to an access instruction of the charger, controlling the main discharging module and the pre-charging module to be conducted, and controlling the pre-discharging module and the main charging module to be disconnected;
and acquiring a sampling value of the voltage of the charging cathode to judge whether the state of the currently accessed charger is abnormal, and if not, controlling the pre-charging module to be disconnected and controlling the main charging module to be connected.
12. The battery operation management method according to claim 11, wherein if the voltage sampling result at the first time after the pre-discharge module is turned on satisfies the following condition:V 21 ≤k 1 *V 1 wherein, in the step (A),V 21 to discharge at a first time t1The value of the sampled value of the voltage,V 1 is the voltage of the battery and is,k 1 is a first proportional threshold value which is preset,k 1 is greater than or equal to 50%, the set value at the first time t1 ranges from 150 to 500ms;
and the voltage sampling result at the second moment after the pre-discharge module is conducted meets the following conditions:V 22 ≤k 2 *V 1 wherein, in the step (A),V 22 is the sampled value of the discharge cathode voltage at the second time t2,V 1 is the voltage of the battery and is,k 2 is a preset second proportional threshold value,k 2 the set value of (a) is between 1% and 15%, and the set value range of the second time t2 is between 1 and 3s;
it is determined that the currently accessed load state is not abnormal.
13. The battery operation management method according to claim 11, wherein if the voltage sampling result at the third time after the main discharging module and the pre-charging module are turned on satisfies the following condition:V 31 ≤k 3 *V 1 wherein, in the process,V 31 as a sampled value of the discharge cathode voltage at the third time t3,V 1 is the voltage of the battery and is,k 3 is a third preset proportion threshold value, and the third proportion threshold value,k 3 is greater than or equal to 50%, the set value at the third time t3 ranges from 150 to 500ms;
and the voltage sampling result at the fourth moment after the main discharging module and the pre-charging module are conducted meets the following conditions:V 32 ≤k 4 *V 1 wherein, in the step (A),V 32 as a sampling value of the discharge cathode voltage at the fourth time t2,V 1 is the voltage of the battery and is,k 4 is a preset fourth proportional threshold value, and the proportional threshold value is set,k 4 is between 20% and 35%, the set value of the fourth time t4 ranges from 1 to 3s;
it is determined that the state of the currently accessed charger is not abnormal.
14. The battery operation management method according to claim 11, wherein if the sampled value of the discharge cathode voltage satisfies the following condition:V 23 ＜k 3 *V 1 wherein, in the step (A),V 23 is a sampling value of the discharge cathode voltage under the condition that the pre-discharge module and the main discharge module are both disconnected,V 1 is the voltage of the battery and is,k 3 is a preset second proportional threshold value and is,k 3 if the set value of the main discharging module is between 1% and 15%, the breakdown damage of the controllable switch of the main discharging module is judged; and/or the presence of a gas in the gas,
if the sampling value of the discharge cathode voltage meets the following conditions:V 24 ＞V preset wherein, in the process,V 24 is a sampling value of the voltage of the discharge cathode under the conditions that the pre-discharge module is disconnected and the main discharge module is connected,V preset is a preset breaking voltage threshold, wherein,V preset if the set value of the main discharging module is between 0.4 and 3V, the controllable switch of the main discharging module is judged to be broken and damaged.
15. The battery operation management method according to claim 11, further comprising monitoring one or more of voltage, current and temperature parameters of the battery in real time during the operation of the battery, and turning off the pre-discharge module, the main discharge module, the pre-charge module and the main charge module if the monitored parameters reach a protection threshold; and if not, inquiring whether a shutdown signal is received, if so, closing the pre-discharge module, the main discharge module, the pre-charge module and the main charge module, and entering a standby mode until the standby timing overflows, and shutting down and sleeping the BMS.
CN202211407334.1A 2022-11-10 2022-11-10 Battery operation management system and battery operation management method Active CN115579999B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202310687620.6A CN116599187A (en) 2022-11-10 2022-11-10 Battery system and battery operation management method
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CN213093258U (en) * 2020-08-11 2021-04-30 珠海冠宇动力电池有限公司 Battery system and battery system group
CN113219289A (en) * 2021-06-03 2021-08-06 惠州美安时能源科技有限公司 BMS load detection circuit and system
CN214707250U (en) * 2021-04-29 2021-11-12 珠海迈巨微电子有限责任公司 Integrated device, battery management chip and system and isolated power supply
CN216153618U (en) * 2021-09-18 2022-04-01 北京骑胜科技有限公司 Battery management system, battery pack and vehicle
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CN111953043A (en) * 2020-08-11 2020-11-17 珠海冠宇动力电池有限公司 Battery management method, device and equipment
CN213093258U (en) * 2020-08-11 2021-04-30 珠海冠宇动力电池有限公司 Battery system and battery system group
CN214707250U (en) * 2021-04-29 2021-11-12 珠海迈巨微电子有限责任公司 Integrated device, battery management chip and system and isolated power supply
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