CN112467813B - Method and system for opening and closing current limiting of battery management system - Google Patents
Method and system for opening and closing current limiting of battery management system Download PDFInfo
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- CN112467813B CN112467813B CN201910847778.9A CN201910847778A CN112467813B CN 112467813 B CN112467813 B CN 112467813B CN 201910847778 A CN201910847778 A CN 201910847778A CN 112467813 B CN112467813 B CN 112467813B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a method and a system for opening and closing current limiting of a battery management system, comprising the following steps: acquiring the current state of the battery pack; the current of the battery pack comprises a normal charge state and a current limiting charge state; if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method; if the current state of the battery pack is the current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by a second control method. The invention can effectively switch the current limiting module to be opened and closed, can ensure that the voltage at the two ends of the load is not too high, and can not damage internal devices, thereby avoiding the problem of cycle cabinet step-out in the switching process of opening and closing the current limiting module.
Description
Technical Field
The present invention relates to the field of battery management, and more particularly, to a method and system for opening and closing a current limit of a battery management system.
Background
The battery management system is an indispensable part of battery application, and can effectively monitor the charging state of the battery in the charging process and the discharging state in the discharging process, so that the battery is prevented from being overcharged or overdischarged, corresponding protection actions are timely acted when the battery is abnormal, the battery is prevented from being damaged, and the service life of the battery is prolonged.
For example, in the battery charging process, if the voltage across the charging device is too high, so that when the battery is charged through the normal charging loop, there is a risk of damaging the battery, at this time, the Battery Management System (BMS) controls to open the current limiting module, and charges the battery after current limiting through the current limiting module, so as to ensure that the battery can be safely charged. Meanwhile, after the current limiting is finished, the battery is charged by controlling the normal charging loop to be returned to ensure that the battery can be charged effectively.
However, in the current battery management system, the problem that the high voltage generated at the two ends of the (p+ and P-) of the charging equipment breaks down the MOS transistor when the current limiting module is turned on and turned off cannot be effectively controlled, or the high voltage generated at the two ends of the charging equipment cannot be effectively managed in the test process, so that the problem that the MOS transistor breaks down occurs, the problem that the current limiting module jumps the process step of the circulation cabinet in the switching process of the on and off is caused, and the safety and reliability of the battery are reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method and a system for opening and closing current limiting of a battery management system.
The technical scheme adopted for solving the technical problems is as follows: provided is a method for opening and closing a current limit of a battery management system, including:
acquiring the current state of the battery pack; the current of the battery pack comprises a normal charge state and a current limiting charge state;
if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method;
if the current state of the battery pack is the current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by a second control method.
In one embodiment, the charging current when the current state of the battery pack is a normal charging state is a normal charging current, and the charging current when the current state of the battery pack is a current limiting charging current.
In one embodiment, if the current state of the battery pack is a normal charging state, determining whether the current-limiting charging state needs to be entered includes:
acquiring normal charging current of the battery pack;
judging whether the normal charging current is larger than the current limiting starting current or not;
if yes, judging that the current-limiting charging state needs to be entered; if not, the normal charge state is maintained.
In one embodiment, if yes, starting the current limiting module by using the first control method includes:
controlling the current limiting module to be started;
monitoring the duration of time that the current limiting module is turned on;
judging whether the duration time reaches a first preset time or not;
if yes, the charging switch is controlled to be turned off.
In one embodiment, if the current state of the battery pack is a current limited charging state, determining whether the normal charging state needs to be entered includes: and judging through any one or more of the current charging current, the current cell voltage of the battery pack and the current temperature of the battery pack.
In one embodiment, if yes, closing the current limit with the second control method includes:
controlling the charging switch to be closed;
after the charging switch is closed, monitoring the closing time of the charging switch;
judging whether the closing time reaches a second preset time or not;
if yes, the current limiting module is controlled to be closed.
The invention also provides a current limiting opening and closing system of a battery management system, which comprises: the device comprises a battery pack, a current detection module, a charging switch, a current limiting module and a control unit;
when the battery pack is connected to the charging equipment, receiving charging current provided by the charging equipment for charging;
the current detection module is used for detecting the current charging current of the battery pack;
the charging switch is turned on or off according to the control of the control unit;
the current limiting module is opened or closed according to the control of the control unit;
the control unit is used for executing the following actions:
acquiring the current state of the battery pack; the current of the battery pack comprises a normal charge state and a current limiting charge state;
if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method;
if the current state of the battery pack is the current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by a second control method.
In one embodiment, when the current state of the battery pack is a normal charging state, the charging switch is turned on, and the current limiting module is turned off;
when the current state of the battery pack is a current limiting charging state, the charging switch is disconnected, and the current limiting module is started.
In one embodiment, the charging switch comprises a MOS transistor.
The method for opening and closing the current limit of the battery management system has the following beneficial effects: the method for opening and closing the current limit of the battery management system comprises the following steps: acquiring the current state of the battery pack; the current of the battery pack comprises a normal charge state and a current limiting charge state; if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method; if the current state of the battery pack is the current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by a second control method. The invention can effectively switch the current limiting module to be opened and closed, can ensure that the voltage at the two ends of the load is not too high, and can not damage internal devices, thereby avoiding the problem of cycle cabinet step-out in the switching process of opening and closing the current limiting module.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a battery management system current limiting opening and closing system according to the present invention;
FIG. 2 is a flow chart of one embodiment of a method for opening and closing a battery management system current limit according to the present invention;
FIG. 3 is a flow chart of another embodiment of a method for opening and closing a current limit of a battery management system according to the present invention;
fig. 4 is a flowchart illustrating a method for opening and closing a current limit of a battery management system according to still another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic diagram of a structure of a current limiting opening and closing system of a battery management system according to the present invention is shown.
As shown in fig. 1, the opening and closing system of the battery management system current limit includes: a battery pack 11, a current detection module 12, a charge switch 13, a current limiting module 15, and a control unit 14.
When the battery pack 11 is connected to the charging device, the charging current provided by the charging device is received for charging. The charging state of the battery pack 11 includes a normal charging state and a current limiting charging state, and when the battery pack 11 is in the normal charging state, a normal charging current is formed correspondingly; when the battery 11 is in the current-limiting charge state, the current-limiting charge current is formed.
The current detection module 12 is configured to detect a present charging current of the battery pack 11. Alternatively, the current detection module 12 may include a sampling resistor, through which real-time acquisition of the present charging current of the battery pack 11 may be achieved.
The charge switch 13 is turned on or off according to the control of the control unit 14. As can be appreciated, when the battery pack 11 is normally charged, the charging switch 13 is closed, and the normal charging current flows through the sampling resistor after passing through the charging switch 13 in sequence. When the battery pack 11 is current-limited charged, the charging switch 13 is turned off, and the charging circuit is not turned on. Optionally, the charging switch 13 includes, but is not limited to, a MOS transistor.
The flow limiting module 15 is turned on or off according to the control of the control unit 14. As can be appreciated, when the battery 11 is normally charged, the current limiting module 15 is closed, and the current limiting circuit is not opened; when the battery pack 11 is in current-limiting charging, the current-limiting module 15 is turned on, the current-limiting circuit is turned on, and the current-limiting charging current can charge the battery pack 11 through the current-limiting circuit.
The control unit 14 is arranged to perform the following actions: acquiring the current state of the battery pack 11; the current state of charge of the battery 11 includes a normal state of charge and a current limited state of charge; if the current state of the battery pack 11 is a normal charging state, judging whether the current-limiting charging state is needed to be entered; if yes, starting the current limiting module 15 by a first control method; if the current state of the battery pack 11 is the current-limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by using a second control method.
Further, in the embodiment of the present invention, when the current state of the battery pack 11 is the normal charging state, the charging switch 13 is turned on, and the current limiting module 15 is turned off. When the current state of the battery pack 11 is the current-limiting charging state, the charging switch 13 is turned off, and the current-limiting module 15 is turned on. Accordingly, the current state of the battery pack 11 may be acquired by detecting the on/off state of the current limiting module 15 to determine the state in which the battery pack 11 is currently located. Of course, it will be appreciated that in other embodiments, the control unit 14 may also obtain the current state of the battery pack 11 in other manners, and the present invention is not limited herein.
Referring to fig. 2, a flow chart of a method for opening and closing a current limit of a battery management system according to an embodiment of the present invention is shown. The method for opening and closing the current limit of the battery management system can be realized through the system for opening and closing the current limit of the battery management system.
As shown in fig. 2, the method for opening and closing the current limit of the battery management system includes: step S101, step S102, and step S103.
Specifically, in step S101, the current state of the battery pack 11 is acquired.
The battery pack 11 of the embodiment of the present invention currently includes a normal charge state and a current-limiting charge state. Optionally, when the battery 11 is in a normal charging state, the current of the charging circuit is a normal charging current; when the battery pack 11 is in the current-limited charging state, the current of the charging circuit is the current-limited charging current.
Wherein both the normal charging current and the limited charging current are monitored and judged in real time by the control unit 14.
Step S102, if the current state of the battery pack 11 is a normal charging state, judging whether to enter a current limiting charging state; if yes, the current limiting module 15 is turned on by the first control method.
Referring to fig. 1, when the current state of the battery pack 11 is a normal charging state, the charging switch 13 is turned on, and the current limiting module 15 is turned off.
If the current state of the battery pack 11 is a normal charging state, the determining whether the current-limiting charging state needs to be entered may be implemented by the following steps:
the normal charge current of the battery pack 11 is acquired.
Judging whether the normal charging current is larger than the current limiting starting current.
If yes, judging that the current-limiting charging state needs to be entered; if not, the normal charge state is maintained.
Further, as shown in fig. 3, if the current-limiting charging state needs to be entered, the current-limiting module 15 is turned on by the first control method, which may be implemented by the following steps:
step S301, the current limiting module 15 is controlled to be turned on.
Step S302, monitoring the duration of the current limiting module 15 being turned on.
Step S303, judging whether the duration time reaches a first preset time.
Step S304, if yes, controls the charging switch 13 to be turned off.
It can be understood that, when the current limiting module 15 is controlled to be turned on and continues until the first preset time is reached, the current limiting module 15 and the charging switch 13 are turned on at the same time, and the charging switch 13 is turned off after the first preset time is reached, at this time, the battery 11 enters the current limiting charging state. That is, if the current state of the battery pack 11 is the normal charging state (the battery pack 11 is in the normal charging state), the charging switch 13 is in the on state, and the current limiting module 15 is in the off state; when the control unit 14 determines that the battery pack 11 needs to enter the current-limiting charging state, the control unit 14 controls the current-limiting module 15 to be turned on first, at this time, the charging switch 13 is still turned on, that is, the current-limiting module 15 and the charging switch 13 are turned on simultaneously, and when the control unit 14 monitors that the time when the current-limiting module 15 and the charging switch 13 are turned on simultaneously reaches a first preset time (set to T1), the control unit 14 controls the charging switch 13 to be turned off, so that the charging switch 13 is turned off, at this time, the battery pack 11 enters the current-limiting charging state.
Optionally, the first preset time may be adjusted according to specific requirements, and the present invention is not limited specifically.
Step S103, if the current state of the battery pack 11 is the current-limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing the current limiting by a second control method.
If the current state of the battery pack 11 is the current-limiting charging state, the determination of whether to enter the normal charging state is implemented by the following steps:
the current limiting charging time of the battery pack 11 is acquired.
And judging whether the current-limiting charging time reaches a current-limiting charging threshold value or not.
If yes, judging that the normal charging state needs to be entered; if not, the current limiting charging state is maintained.
Further, as shown in fig. 4, if the normal charging state needs to be entered, the closing of the current limiting module 15 by the second control method may be achieved by:
step S401, the charging switch 13 is controlled to be closed.
Step S402, after the charging switch 13 is closed, monitoring the closing time of the charging switch 13.
Step S403, determining whether the closing time reaches a second preset time.
In step S404, if yes, the current limiting module 15 is controlled to be turned off.
It can be understood that, when the charging switch 13 is controlled to be closed and continues until the second preset time is reached, the charging switch 13 and the current limiting module 15 are in the on state at the same time, and after the second preset time is reached, the current limiting module 15 is disconnected, the current limiting charging is closed, and the battery 11 enters the normal charging state from the current limiting charging state. That is, if the current state of the battery pack 11 is the current-limiting charging state (the battery pack 11 is in the current-limiting charging state), the charging switch 13 is in the off state, and the current-limiting module 15 is in the on state; when the control unit determines that the battery pack 11 needs to enter the normal charging state, the control unit 14 controls the charging switch 13 to be turned on first, at this time, the current limiting module 15 is still in an on state, that is, the current limiting module 15 and the charging switch 13 are turned on simultaneously, and when the control unit 14 monitors that the time for which the current limiting module 15 and the charging switch 13 are turned on simultaneously reaches a second preset time (set to T2), the control unit 14 controls the current limiting module 15 to be turned off, and the current limiting charging is turned off, so that the battery pack 11 enters the normal charging state.
Optionally, the second preset time may be adjusted according to specific requirements, and the present invention is not limited specifically.
According to the method for opening and closing the current limit of the battery pack 11 management system, through the steps and the time sequence control (namely, the time sequence control of opening and closing the charging switch 13 and the current limit module 15 and the related time delay control), the opening and closing of the current limit module 15 can be effectively switched, and as long as the time delay time (the first preset time T1 and the second preset time T2) is adjusted to be proper, the voltages at two ends of the charging equipment (P+ and P-) can be ensured not to be too high, the duration time is not too long, the charging switch 13 and the current limit module 15 can not be damaged, the problem of step-skipping caused by the fact that the battery cell voltage cannot be detected by a circulation cabinet is avoided, the safety and the reliability of the battery pack 11 are effectively improved, and the service life of the battery pack 11 is prolonged.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. A method for opening and closing a current limit of a battery management system, comprising:
acquiring the current state of the battery pack; the current state of the battery pack comprises a normal charging state and a current limiting charging state;
if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method, wherein the current limiting module specifically comprises:
controlling the current limiting module to be started;
monitoring the duration of time that the current limiting module is turned on;
judging whether the duration time reaches a first preset time or not;
if yes, the charging switch is controlled to be disconnected;
if the current state of the battery pack is a current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing current limiting by a second control method, wherein the method specifically comprises the following steps:
controlling the charging switch to be closed;
after the charging switch is closed, monitoring the closing time of the charging switch;
judging whether the closing time reaches a second preset time or not;
if yes, the current limiting module is controlled to be closed;
wherein, if the current state of the battery pack is a current limited charging state, determining whether to enter a normal charging state includes: and judging through any one or more of the current charging current of the battery pack, the current cell voltage of the battery pack and the current temperature of the battery pack.
2. The method of claim 1, wherein the charging current when the current state of the battery pack is a normal charging state is a normal charging current, and the charging current when the current state of the battery pack is a current limiting charging state is a current limiting charging current.
3. The method for opening and closing current limit of battery management system according to claim 2, wherein if the current state of the battery pack is a normal state of charge, determining whether the current limit state of charge needs to be entered comprises:
acquiring normal charging current of the battery pack;
judging whether the normal charging current is larger than the current limiting starting current or not;
if yes, judging that the current-limiting charging state needs to be entered; if not, the normal charge state is maintained.
4. A battery management system current limiting opening and closing system, comprising: the device comprises a battery pack, a current detection module, a charging switch, a current limiting module and a control unit;
when the battery pack is connected to the charging equipment, receiving charging current provided by the charging equipment for charging;
the current detection module is used for detecting the current charging current of the battery pack;
the charging switch is turned on or off according to the control of the control unit;
the current limiting module is opened or closed according to the control of the control unit;
the control unit is used for executing the following actions:
acquiring the current state of the battery pack; the current of the battery pack comprises a normal charge state and a current limiting charge state;
if the current state of the battery pack is a normal charging state, judging whether the battery pack needs to enter a current-limiting charging state or not; if yes, starting a current limiting module by a first control method, wherein the current limiting module specifically comprises:
controlling the current limiting module to be started;
monitoring the duration of time that the current limiting module is turned on;
judging whether the duration time reaches a first preset time or not;
if yes, the charging switch is controlled to be disconnected;
if the current state of the battery pack is a current limiting charging state, judging whether the battery pack needs to enter a normal charging state, if so, closing current limiting by a second control method, wherein the method specifically comprises the following steps:
controlling the charging switch to be closed;
after the charging switch is closed, monitoring the closing time of the charging switch;
judging whether the closing time reaches a second preset time or not;
if yes, the current limiting module is controlled to be closed;
wherein, if the current state of the battery pack is a current limited charging state, determining whether to enter a normal charging state includes: and judging through any one or more of the current charging current of the battery pack, the current cell voltage of the battery pack and the current temperature of the battery pack.
5. The system of claim 4, wherein the charge switch is turned on and the current limiting module is turned off when the current state of the battery pack is a normal charge state;
when the current state of the battery pack is a current limiting charging state, the charging switch is disconnected, and the current limiting module is started.
6. The system of claim 4, wherein the charge switch comprises a MOS transistor.
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| CN201910847778.9A CN112467813B (en) | 2019-09-09 | 2019-09-09 | Method and system for opening and closing current limiting of battery management system |
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| CN112467813A (en) | 2021-03-09 |
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