CN112260359B - BMS control method, system, electronic equipment and storage medium - Google Patents

BMS control method, system, electronic equipment and storage medium Download PDF

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Publication number
CN112260359B
CN112260359B CN202011154480.9A CN202011154480A CN112260359B CN 112260359 B CN112260359 B CN 112260359B CN 202011154480 A CN202011154480 A CN 202011154480A CN 112260359 B CN112260359 B CN 112260359B
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charge
discharge loop
external
voltage
current
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CN112260359A (en
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葛厚艺
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Jiangsu Boqiang New Energy Technology Co ltd
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Jiangsu Boqiang New Energy Technology Co ltd
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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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a BMS control method, a BMS control system, electronic equipment and a storage medium, wherein the BMS control method is used for safely controlling a charge and discharge loop and an external circuit and comprises the following steps: collecting voltage V between external positive electrode and external negative electrode in charge-discharge loop 1 And current I at the external positive electrode or external negative electrode 1 The method comprises the steps of carrying out a first treatment on the surface of the Collecting voltage V between internal positive electrode and internal negative electrode in charge-discharge loop 2 And current I at the internal positive electrode or internal negative electrode 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the real-time state of the charge-discharge loop, selecting a corresponding control strategy and based on voltage V 1 、V 2 Current I 1 、I 2 And safety control is carried out on the charge and discharge loop and an external circuit. Compared with the prior art, the invention can realize fault judgment of the lithium battery, the charge-discharge loop, the load and the like by collecting the current and the voltage inside and outside the BMS and carrying out safety control on the BMS through the corresponding safety control strategy, thereby ensuring the safety of the whole BMS.

Description

BMS control method, system, electronic equipment and storage medium
Technical Field
The invention belongs to the technical field of battery management, and particularly relates to a BMS control method, a BMS control system, electronic equipment and a storage medium.
Background
A BATTERY Management System (BMS) MANAGEMENT SYSTEM is a tie between a BATTERY and a user, and can improve the utilization rate of the BATTERY and prevent overcharge and overdischarge of the BATTERY.
The existing Battery Management System (BMS) collects relevant battery information (voltage, current, temperature and the like), controls the charge-discharge MOS after being processed by the MCU, cuts off a charge-discharge loop, achieves the purpose of protecting the battery, and monitors the state of the battery through a dynamic ring monitoring system (FSU).
However, in the prior art, only the voltage and the current entering the battery are sampled, only the collected voltage, current, temperature and the like are simply processed, comprehensive safety detection cannot be performed, the problem of the battery cannot be predicted in time, and safety accidents cannot be completely avoided.
Accordingly, in view of the above-described technical problems, it is necessary to provide improvements to the existing BMS control technology.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a BMS control method, a BMS control system, an electronic device and a storage medium, wherein the BMS control method, the BMS control system and the storage medium have high control accuracy and can realize comprehensive safety control.
The aim of the invention can be achieved by the following technical scheme:
the BMS control method is used for safely controlling a charge-discharge loop and an external circuit and comprises the following steps:
collecting voltage V between external positive electrode and external negative electrode in charge-discharge loop 1 And current I at the external positive electrode or external negative electrode 1 ；
Collecting voltage V between internal positive electrode and internal negative electrode in charge-discharge loop 2 And current I at the internal positive electrode or internal negative electrode 2 ；
According to the real-time state of the charge-discharge loop, selecting a corresponding control strategy and based on voltage V 1 、V 2 Current I 1 、I 2 And safety control is carried out on the charge and discharge loop and an external circuit.
Further, the control strategy includes:
in standby state, current I 1 And I 2 0, when V 1 ≤V UV When the output voltage of the charge-discharge loop is abnormal, when V UV <V 1 <V OV And V is 1 ≥V 2 Starting charging when V 1 ≥V OV When the lithium battery is abnormal, V UV V is the undervoltage protection value of the charge-discharge loop OV Is the overvoltage protection value of the charge-discharge loop, and V UV <V OV ；
In the charged state, when I 1 >I 2 When the charge and discharge loop is in fault, when V 1 When the variation amplitude of the lithium battery is larger than a first preset threshold value and reaches a first preset number of times, judging that the lithium battery is in fault and closing charging;
in the discharge state, when I 1 <I 2 When the charge-discharge loop is abnormal and the discharge is closed, when I 1 ＝I 2 And I 1 And when the change amplitude is larger than a second preset threshold value and reaches a second preset number of times, judging that the external load is abnormal and closing the discharge.
Further, when V UV <V 1 <V OV And V is 1 ≥V 2 When the charging is started, if V 1 <V 2 +V 0 And I 1 、I 2 0, judge the lithium battery fault, V 0 Is a preset voltage value.
Further, the preset voltage value V 0 0.1V to 0.3V.
Further, the preset voltage value V 0 Is 0.2V.
Further, the first preset threshold is greater than or equal to 5V/s, the first preset times is greater than or equal to 1 time, the second preset threshold is greater than or equal to 10V/s, and the second preset times is greater than or equal to 10 times.
The invention also provides a BMS control system for safety control of a charge-discharge loop and an external circuit, comprising:
an external data acquisition unit including a voltage V for acquiring voltage between an external positive electrode and an external negative electrode 1 Is used for collecting current I at an external positive electrode or an external negative electrode 1 Is a first current collection unit of (a);
an internal data acquisition unit including a voltage V for acquiring voltage between an internal positive electrode and an internal negative electrode 2 Is used for collecting the current I at the internal positive electrode or the internal negative electrode 2 Is a second current acquisition unit of (a);
BMS control unit connected with the internal data acquisition unit, the external data acquisition unit and the charge-discharge loop for charging and discharging according to the chargeThe real-time state of the electric loop is selected corresponding control strategy and based on voltage V 1 、V 2 Current I 1 、I 2 And safety control is carried out on the charge and discharge loop and an external circuit.
Further, the control strategy includes:
in standby state, current I 1 And I 2 0, when V 1 ≤V UV When the output voltage of the charge-discharge loop is abnormal, when V UV <V 1 <V OV And V is 1 ≥V 2 When the charging is started, when V 1 ≥V OV When the lithium battery is abnormal, V UV V is the undervoltage protection value of the charge-discharge loop OV Is the overvoltage protection value of the charge-discharge loop, and V UV <V OV ；
In the charged state, when I 1 >I 2 When the charge and discharge loop is in fault, when V 1 When the variation amplitude of the lithium battery is larger than a first preset threshold value and reaches a first preset number of times, judging that the lithium battery is in fault and closing charging;
in the discharge state, when I 1 <I 2 When the charge-discharge loop is abnormal and the discharge is closed, when I 1 ＝I 2 And I 1 And when the change amplitude is larger than a second preset threshold value and reaches a second preset number of times, judging that the external load is abnormal and closing the discharge.
The present invention also provides an electronic device including:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the BMS control method as described.
The present invention also provides a computer-readable storage medium including one or more programs for execution by one or more processors of an electronic device, the one or more programs including instructions for performing the BMS control method as described above.
Compared with the prior art, the invention has the following beneficial effects:
1. through gathering inside and outside electric current and the voltage of charge-discharge return circuit, carry out safety control to BMS system through corresponding safety control strategy, can realize trouble judgement such as lithium cell, charge-discharge return circuit, load, guaranteed the security of whole BMS system.
2. Different states of the charge and discharge loop, such as a standby state, a charge state, a discharge state and the like, are considered, and different control strategies are adopted for safety control under different states, so that the fault judgment accuracy is higher.
3. The method is simple and effective, and can be conveniently applied to embedded equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
Fig. 1 is a schematic block diagram of a BMS control system according to an embodiment of the present invention;
fig. 2 is a flowchart of a BMS control method according to an embodiment of the invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
As shown in fig. 1, this embodiment provides a BMS control system for performing safety control on a charge and discharge circuit and an external circuit, the charge and discharge circuit includes a lithium battery 10, a charging unit 21 and a discharging unit 22, the positive electrode and the negative electrode of the charge and discharge circuit are an external positive electrode (p+) and an external negative electrode (P "), and the positive electrode and the negative electrode of the lithium battery are an internal positive electrode (b+) and an internal negative electrode (B"), the BMS control system includes:
an external data acquisition unit comprising a voltage V for acquiring voltage between an external positive electrode (P+) and an external negative electrode (P-) 1 Is used for collecting the current I at the external positive electrode or the external negative electrode 1 Is provided with a first current acquisition unit 32;
an internal data acquisition unit including a voltage V between an internal positive electrode (B+) and an internal negative electrode (B-) 2 Is used for collecting the current I at the internal positive electrode or the internal negative electrode 2 Is provided for the second current acquisition unit 42;
the BMS control unit 50 is connected to the internal data acquisition unit, the external data acquisition unit, and the charge/discharge circuit, and is used for safely controlling the charge/discharge circuit and the external circuit according to the data acquired by the internal data acquisition unit and the external data acquisition unit.
Preferably, the charging unit is a charging MOS tube, and the discharging unit is a discharging MOS tube.
The first voltage acquisition unit 31 and the second voltage acquisition unit 41 in the present embodiment directly acquire voltages between the lithium batteries b+, B-and between the charge and discharge circuits p+, P-, and the first current acquisition unit 32 and the second current acquisition unit 42 acquire the resistor R 1 And R is 2 Voltage U at both ends 1 、U 2 And is converted into a flow-through resistor R 1 And R is 2 Is the current I of (2) 1 、I 2 ，I 1 ＝U 1 /R 1 ，I 2 ＝U 2 /R 2 。
Accordingly, referring to fig. 2, the BMS control method based on current-voltage sampling in this embodiment includes:
s1, collecting voltage V between an external positive electrode (P+) and an external negative electrode (P-) in a charge-discharge loop 1 And current I at the external positive electrode or external negative electrode 1 ；
S2, collecting the voltage V between the internal positive electrode (B+) and the internal negative electrode (B-) in the charge-discharge loop 2 And current I at the internal positive electrode or internal negative electrode 2 ；
S3, selecting a corresponding control strategy according to the real-time state of the charge-discharge loopSlightly and based on voltage V 1 、V 2 Current I 1 、I 2 And safety control is carried out on the charge and discharge loop and an external circuit.
In this embodiment, the security control policy in step S3 specifically includes:
strategy 1: the BMS control unit is in standby state (the charging unit and the discharging unit are both closed), and the current I 1 And I 2 At 0, the charging unit and the discharging unit are turned off, when V 1 ≤V UV When the output voltage of the charge-discharge loop is abnormal, when V UV <V 1 <V OV And V is 1 ≥V 2 When the charging unit is started to charge, when V 1 ≥V OV When the lithium battery is abnormal, V UV V is the undervoltage protection value of the charge-discharge loop OV Is the overvoltage protection value of the charge-discharge loop, and V UV <V OV 。
In another preferred embodiment, when V UV <V 1 <V OV And V is 1 ≥V 2 After the charging unit is started to charge, if V 1 <V 2 +V 0 And I 1 、I 2 0, determining a lithium battery failure, wherein V 0 The voltage value is preset and is 0.1V-0.3V. The preset voltage value V in the present embodiment 0 Is 0.2V.
Strategy 2: when the BMS control unit is in a charging state (the charging MOS tube is opened and the discharging MOS tube is closed), the BMS control unit is in a state of I 1 >I 2 When the charge and discharge loop is in fault, when V 1 When the variation amplitude of the lithium battery is larger than the first preset threshold value and reaches the first preset times, the lithium battery is judged to be faulty and the charging unit is closed.
Preferably, the first preset threshold is greater than or equal to 5V/s and the first preset number of times is greater than or equal to 1 time. In this embodiment, the first preset threshold is 5V/s, and the first preset times are 1 time.
Strategy 3: the BMS control unit is in a discharging state (the discharging MOS tube is opened, the charging MOS tube is closed), when I 1 <I 2 When the charge-discharge loop is abnormal and the discharge unit is closed, when I 1 ＝I 2 And I 1 And when the change amplitude is larger than a second preset threshold value and reaches a second preset number of times, judging that the external load is abnormal and closing the discharge unit.
Preferably, the second preset threshold is greater than or equal to 10V/s and the second preset number of times is greater than or equal to 10 times. In this embodiment, the second preset threshold is 10V/s, and the second preset times are 10 times.
Further, the collected voltage and current data and the state of the charge and discharge loop, the lithium battery and the external circuit determined according to the voltage and the current are also reported to a movable ring monitoring system (FSU), wherein the FSU is the prior art in BMS control, and no description is repeated here.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Example 2
The embodiment provides a BMS control method for performing safety control on a charge and discharge loop and an external circuit, including the following steps: collecting voltage V between external positive electrode and external negative electrode in charge-discharge loop 1 And current I at the external positive electrode or external negative electrode 1 The method comprises the steps of carrying out a first treatment on the surface of the Collecting internal positive in charge-discharge loopVoltage V between the pole and the internal negative electrode 2 And current I at the internal positive electrode or internal negative electrode 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the real-time state of the charge-discharge loop, selecting a corresponding control strategy and based on voltage V 1 、V 2 Current I 1 、I 2 And safety control is carried out on the charge and discharge loop and an external circuit. The control strategy is as described in example 1.
In the BMS control method of the present embodiment, specific parameters of the control policy are selected as follows: preset voltage value V 0 The voltage is 0.1V, the first preset threshold is 8V/s, the first preset times are 3 times, the second preset threshold is 12V/s, and the second preset times are 15 times.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment contains only one independent technical solution, and that such description is provided for clarity only, and that the technical solutions of the embodiments may be appropriately combined to form other embodiments that will be understood by those skilled in the art.

Claims (8)

1. The BMS control method is characterized by being used for safely controlling a charge and discharge loop and an external circuit and comprising the following steps of:
collecting voltage V between external positive electrode and external negative electrode in charge-discharge loop 1 And current I at the external positive electrode or external negative electrode 1 ；
Collecting voltage V between internal positive electrode and internal negative electrode in charge-discharge loop 2 And current I at the internal positive electrode or internal negative electrode 2 ；
According to the real-time state of the charge-discharge loop, selecting a corresponding control strategy and based on voltage V 1 、V 2 Current I 1 、I 2 Safety control is carried out on the charge and discharge loop and an external circuit;
the control strategy comprises the following steps:
in standby state, current I 1 And I 2 0, when V 1 ≤V UV When the output voltage of the charge-discharge loop is abnormal, when V UV <V 1 <V OV And V is 1 ≥V 2 When the charging is started, when V 1 ≥V OV When the lithium battery is abnormal, V UV V is the undervoltage protection value of the charge-discharge loop OV Is the overvoltage protection value of the charge-discharge loop, and V UV <V OV ；
In the charged state, when I 1 >I 2 When the charge and discharge loop is in fault, when V 1 When the variation amplitude of the lithium battery is larger than a first preset threshold value and reaches a first preset number of times, judging that the lithium battery is in fault and closing charging;
in the discharge state, when I 1 <I 2 When the charge-discharge loop is abnormal and the discharge is closed, when I 1 ＝I 2 And I 1 And when the change amplitude is larger than a second preset threshold value and reaches a second preset number of times, judging that the external load is abnormal and closing the discharge.
2. The BMS control method according to claim 1, wherein when V UV <V 1 <V OV And V is 1 ≥V 2 After charging is started, if V 1 <V 2 +V 0 And I 1 、I 2 0, judge the lithium battery fault, V 0 Is a preset voltage value.
3. The BMS control method of claim 2, whichCharacterized in that the preset voltage value V 0 0.1V to 0.3V.
4. The BMS control method according to claim 3, wherein the preset voltage value V 0 Is 0.2V.
5. The BMS control method according to claim 1, wherein the first preset threshold is greater than or equal to 5V/s, the first preset number of times is greater than or equal to 1 time, the second preset threshold is greater than or equal to 10V/s, and the second preset number of times is greater than or equal to 10 times.
6. The BMS control system is characterized by being used for safely controlling a charge-discharge loop and an external circuit, and comprises the following components:
an external data acquisition unit including a voltage V for acquiring voltage between an external positive electrode and an external negative electrode 1 Is used for collecting current I at an external positive electrode or an external negative electrode 1 Is a first current collection unit of (a);
an internal data acquisition unit including a voltage V for acquiring voltage between an internal positive electrode and an internal negative electrode 2 Is used for collecting the current I at the internal positive electrode or the internal negative electrode 2 Is a second current acquisition unit of (a);
the BMS control unit is connected with the internal data acquisition unit, the external data acquisition unit and the charge-discharge loop, and is used for selecting a corresponding control strategy according to the real-time state of the charge-discharge loop and based on voltage V 1 、V 2 Current I 1 、I 2 Safety control is carried out on the charge and discharge loop and an external circuit;
the control strategy comprises the following steps:
in standby state, current I 1 And I 2 0, when V 1 ≤V UV When the output voltage of the charge-discharge loop is abnormal, when V UV <V 1 <V OV And V is 1 ≥V 2 When the charging is started, when V 1 ≥V OV When the lithium battery is abnormal, V UV V is the undervoltage protection value of the charge-discharge loop OV Is the overvoltage protection value of the charge-discharge loop, and V UV <V OV ；
In the charged state, when I 1 >I 2 When the charge and discharge loop is in fault, when V 1 When the variation amplitude of the lithium battery is larger than a first preset threshold value and reaches a first preset number of times, judging that the lithium battery is in fault and closing charging;
in the discharge state, when I 1 <I 2 When the charge-discharge loop is abnormal and the discharge is closed, when I 1 ＝I 2 And I 1 And when the change amplitude is larger than a second preset threshold value and reaches a second preset number of times, judging that the external load is abnormal and closing the discharge.
7. An electronic device, comprising:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the BMS control method of any of claims 1-5.
8. A computer-readable storage medium comprising one or more programs for execution by one or more processors of an electronic device, the one or more programs comprising instructions for performing the BMS control method of any of claims 1-5.
CN202011154480.9A 2020-08-27 2020-10-26 BMS control method, system, electronic equipment and storage medium Active CN112260359B (en)

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CN115378104B (en) * 2022-04-22 2024-02-13 宁德时代新能源科技股份有限公司 Control method, device, system, equipment and storage medium of charge-discharge circuit

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