CN111478404B - Discharging system and discharging control method for lithium battery management system - Google Patents
Discharging system and discharging control method for lithium battery management system Download PDFInfo
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- CN111478404B CN111478404B CN202010403796.0A CN202010403796A CN111478404B CN 111478404 B CN111478404 B CN 111478404B CN 202010403796 A CN202010403796 A CN 202010403796A CN 111478404 B CN111478404 B CN 111478404B
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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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/005—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too low isolation resistance, too high load, short-circuit; earth fault
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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
- 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a discharge system and a discharge control method for a lithium battery management system, wherein the method comprises the following steps: 1) Providing a main discharge loop and a pre-discharge loop, wherein two ends of the main discharge loop are coupled with two ends of the pre-discharge loop; 2) When the load is not connected to the lithium battery management system, the main discharging loop is disconnected; 3) Closing a pre-discharge loop; 4) After the load is connected to the lithium battery management system, carrying out small current detection on the closed pre-discharge loop, and if a small current signal is detected, executing the step 5); if no small current signal is detected, returning to the step 2); 5) Detecting whether an overcurrent or short-circuit signal exists, and if so, executing the step 6); if no overcurrent or short-circuit signal is detected, executing the step 7); 6) Disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step 3); if the load is not removed, continuing to detect until the load is removed; 7) The main discharge loop is closed and the pre-discharge loop is opened.
Description
Technical Field
The invention relates to a lithium battery pack management system.
Background
In the prior art, the following methods are mainly used for solving the negative influence of the load capacitor on the lithium battery management system.
One approach is to increase the protection threshold for over-current and short-circuits. When the lithium battery pack is connected to the load control loop to discharge the load capacitor, the lithium battery pack is prevented from triggering overcurrent or short-circuit protection. But this approach suffers from the following drawbacks:
firstly, when the main discharge loop is closed, instantaneous high current still exists, electric spark is very easy to generate at the interface, so that the interface is oxidized, and poor contact is caused;
secondly, because the protection threshold value of overcurrent and short circuit is improved, a main discharge loop is required to adopt a larger power device, and the cost is increased.
Yet another approach is to discharge the load capacitance for a fixed period of time and then directly close the discharge loop. However, the method has the defect that the overcurrent or short-circuit fault actually generated by the load cannot be found in time, the problem of electric spark generated at the interface cannot be thoroughly solved, and the key components of the discharge loop are subjected to larger impact, so that the reliability is reduced.
Yet another approach is to add isolation detection to the load capacitance voltage over the former approach. But this approach suffers from the following drawbacks:
firstly, an isolation circuit is required to detect the voltage of a load capacitor, the circuit is complex, the cost is high, and the detection precision is low;
second, an overcurrent or a short circuit cannot be accurately detected. The method judges overcurrent or short circuit according to the load capacitance voltage and the empirical value, and the load capacitance voltage can change along with the total voltage of the lithium battery pack, the contact impedance at the load interface and the detection precision of the isolation circuit.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a discharge control system and a discharge control method for a lithium battery management system.
The discharge control method for the lithium battery management system comprises the following steps:
1) Providing a main discharge loop and a pre-discharge loop, wherein two ends of the main discharge loop are coupled with two ends of the pre-discharge loop;
2) When the load is not connected to the lithium battery management system, disconnecting a main discharging loop;
3) Closing a pre-discharge loop;
4) After the load is connected to the lithium battery management system, carrying out small current detection on the closed pre-discharge loop, and if a small current signal is detected, executing the step 5); if no small current signal is detected, returning to the step 2);
5) Detecting whether an overcurrent or short-circuit signal exists, and if so, executing the step 6); if no overcurrent or short-circuit signal is detected, executing the step 7);
6) Disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step 3); if the load is not removed, continuing to detect until the load is removed;
7) Closing the main discharge loop and opening the pre-discharge loop.
In one embodiment, the discharge control method of the present invention further includes:
a small current detection loop, an overcurrent and short circuit detection loop, and a load detection loop are provided.
In one embodiment, the discharge control method of the present invention further includes:
one end of the small current detection loop is coupled between the pre-discharge loop and the load, and the other end of the small current detection loop is coupled with the control unit.
In one embodiment, the discharge control method of the present invention further includes:
one end of the over-current and short-circuit detection loop is coupled between the pre-discharge loop and the load, and the other end of the over-current and short-circuit detection loop is coupled with the control unit.
In one embodiment, the discharge control method of the present invention further includes:
one end of the load detection loop is coupled between the pre-discharge loop and the load, and the other end of the load detection loop is coupled with the control unit.
In one embodiment, the discharge control method of the present invention further includes:
one end of the main discharging loop is coupled with the negative electrode of the lithium battery pack in the lithium battery management system, and the other end of the main discharging loop is coupled with the negative electrode of the load.
In one embodiment, the discharge control method of the present invention further includes:
one end of the pre-discharge loop is coupled with the negative electrode of the lithium battery pack in the lithium battery management system, and the other end of the pre-discharge loop is coupled with the negative electrode of the load.
The discharging system for a lithium battery management system of the present invention is coupled to a load, the discharging system comprising:
the lithium battery pack comprises a positive electrode and a negative electrode, and the positive electrode of the lithium battery pack is coupled with the positive electrode of the load;
the two ends of the main discharge loop are respectively coupled with the negative electrode of the lithium battery pack and the negative electrode of the load;
the two ends of the pre-discharge loop are coupled with the two ends of the main discharge loop;
the small current detection loop is connected between the pre-discharge loop and the load at one end and the control unit at the other end, and is used for detecting whether small current exists in the pre-discharge loop or not and feeding back a detection result to the control unit;
the over-current and short-circuit detection circuit is used for detecting whether the over-current and short-circuit condition exists in the pre-discharge circuit or not and feeding back a detection result to the control unit;
the load detection loop is used for detecting whether the load is removed or not and feeding back a detection result to the control unit;
and the control unit is used for controlling the opening or closing of the main discharge loop and the pre-discharge loop according to the detection results of the small current detection loop, the overcurrent and short circuit detection loop and the load detection loop.
In one embodiment, the control unit controls the opening or closing of the main discharge circuit and the pre-discharge circuit according to the detection result, including the steps of:
a. when the load is not connected to the lithium battery management system, the control unit disconnects the main discharge loop;
b. the control unit closes the pre-discharge loop;
c. d, performing small current detection after the load is connected to a lithium battery management system, and executing the step d if the control unit detects that a small current signal exists in the small current detection loop; if no small current signal is detected, returning to the step a;
d. detecting whether the overcurrent and short-circuit detection loop has an overcurrent or short-circuit signal, and if so, executing the step e; if no overcurrent or short-circuit signal is detected, executing the step f;
e. disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step a, namely re-closing the pre-discharge loop and detecting a current signal; if the load is not removed, continuing to detect until the load is removed;
f. closing the main discharge loop and opening the pre-discharge loop.
In one embodiment, the pre-discharge loop includes a current limiting unit for limiting the current in the prevention circuit when an overcurrent or short circuit signal occurs.
The invention avoids generating electric spark at the interface when the load is connected by closing the pre-discharge loop and opening the main discharge loop, and can detect whether the load is over-current or short-circuit in advance when the load is pre-discharged, thereby avoiding closing the main discharge loop when the external actually exists over-current or short-circuit, eliminating the impact on key components of the system and the main discharge loop, improving the reliability and the service life of the system and saving the cost.
Drawings
The foregoing summary of the invention, as well as the following detailed description of the invention, will be better understood when read in conjunction with the accompanying drawings. It is to be noted that the drawings are merely examples of the claimed invention. In the drawings, like reference numbers indicate identical or similar elements.
Fig. 1 shows a block diagram of a discharge system for a lithium battery management system according to an embodiment of the present invention;
fig. 2 illustrates a discharge control method according to an embodiment of the present invention.
Description of the reference numerals
Preventive circuit 103
Low current detection loop 105
Overcurrent and short-circuit detection loop 106
Steps 201-206
Detailed Description
The detailed features and advantages of the present invention will be readily apparent to those skilled in the art from the following detailed description, claims, and drawings that follow.
The invention improves the pre-discharge loop, adds a low-cost small-current detection loop and an overcurrent and short-circuit detection loop, provides better software control logic, and solves the problem that the existing pre-discharge scheme cannot detect load overcurrent or short circuit in advance.
The pre-discharge control scheme has the advantages of few circuit components, low cost, easy realization, safety, reliability and the like. The invention can close the pre-discharge loop and open the main discharge loop, the small current detection loop can accurately detect the small current signal of the load, and can pre-judge the overcurrent or short circuit fault of the load, and inhibit closing the main discharge loop after the overcurrent or short circuit fault occurs, thereby greatly improving the safety and reliability of the system and prolonging the service life of the lithium battery management system.
Fig. 1 shows a schematic block diagram of a discharge system for a lithium battery management system according to an embodiment of the present invention. The lithium battery management system includes: a lithium battery pack 101, a main discharge circuit 102, a pre-discharge circuit 103, a control unit 104, a small current detection circuit 105, an overcurrent and short circuit detection circuit 106, and a load detection circuit 107.
The lithium battery pack 101 has a positive electrode b+ and a negative electrode B-. The positive electrode B+ of the lithium battery pack 101 is connected with the positive electrode P+ of the load, and the negative electrode B-of the lithium battery pack 101 is connected with the negative electrode P-of the load through the main discharge loop 102 and the pre-discharge loop 103.
Both ends of the main discharge loop 102 are coupled to the negative electrode B-of the lithium battery pack 101 and the negative electrode P-of the load, respectively. In one embodiment, the main discharge loop 102 is used to discharge a lithium battery pack to power a load.
Both ends of the pre-discharge loop 103 are coupled with both ends of the main discharge loop 102. In one embodiment, the pre-discharge loop 103 is used to pre-discharge the load.
The small current detection loop 105 has one end coupled between the pre-discharge loop 103 and the load and the other end coupled to the control unit 104. The small current detection circuit 105 is used for detecting whether a small current exists in the pre-discharge circuit 103, and feeding back the detection result to the control unit 104.
The over-current and short-circuit detection circuit 106 has one end coupled between the pre-discharge circuit 103 and the load and the other end coupled to the control unit 104. The overcurrent and short-circuit detection circuit 106 is configured to detect whether an overcurrent and short-circuit condition exists in the pre-discharge circuit 103, and to feed back a detection result to the control unit 104.
The load detection circuit 107 has one end coupled between the pre-discharge circuit 103 and the load and the other end coupled to the control unit 104. The load detection loop 107 is configured to detect whether the load is removed, and feed back the detection result to the control unit 104;
the control unit 104 controls the opening or closing of the main discharge circuit 102 and the pre-discharge circuit 103 by acquiring signals of the small current detection circuit 105, the overcurrent and short circuit detection circuit 106, and the load detection circuit 107.
In one embodiment, the pre-discharge circuit 103 includes a current limiting unit for limiting the current in the prevention circuit when an over-current or short circuit signal occurs.
In one embodiment, the current limiting unit includes a current limiting resistor.
The control unit controls the opening or closing of the main discharge loop and the pre-discharge loop according to the detection result, and the control unit comprises the following steps:
a. when the load is not connected to the lithium battery management system, the control unit disconnects the main discharge loop;
b. the control unit closes the pre-discharge loop;
c. d, performing small current detection after the load is connected to a lithium battery management system, and executing the step d if the control unit detects that a small current signal exists in the small current detection loop; if no small current signal is detected, returning to the step a;
d. detecting whether the overcurrent and short-circuit detection loop has an overcurrent or short-circuit signal, and if so, executing the step e; if no overcurrent or short-circuit signal is detected, executing the step f;
e. disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step a, namely re-closing the pre-discharge loop and detecting a current signal; if the load is not removed, continuing to detect until the load is removed;
f. closing the main discharge loop and opening the pre-discharge loop.
Fig. 2 shows a flowchart of a discharge control method according to an embodiment of the present invention. The method comprises the following steps:
step 201: when the load is not connected to the lithium battery management system, the load current is zero, and the control unit disconnects the main discharging loop;
step 202: the pre-discharge loop is closed.
In the present invention, when the load is not connected, the lithium battery management system needs to keep the main discharge circuit open and prevent the circuit from closing.
Step 203: when the load is connected to the lithium battery management system, performing small current detection, and if the control unit detects that the small current detection loop has a small current signal, executing step 204; if no small current signal is detected, execution returns to step 201.
In practical applications, there are cases where the load access is unstable due to hardware contact problems, i.e. there may be cases where the load access is temporarily not turned on but is then turned on again. That is, if the system does not detect a small current temporarily, it does not indicate that the load is not connected all the time, and it is possible that the load is connected at the next time. Therefore, the system needs to be restored to the initial state to cope with the case where the load is turned on at the next moment.
Step 204: detecting whether the overcurrent and short-circuit detection loop has an overcurrent or short-circuit signal, and if so, executing step 205; if no over-current or short-circuit signal is detected, step 206 is performed;
step 205: the pre-discharge loop is opened and continued to detect if the load has been removed. If the load is removed, go back to step 201, i.e. re-close the pre-discharge loop and detect the current signal; if the load is not removed, continuing to detect until the load is removed.
The purpose of this step is to keep the main discharge loop open and prevent the circuit from closing when the load is not connected to the lithium battery management system, so as to detect the small current and overcurrent and short circuit of the load before the lithium battery pack completely opens the discharge loop.
Step 206: closing the main discharge loop, opening the pre-discharge loop, and ending the flow after the pre-discharge is successful.
The discharging control method of the invention firstly opens the main discharging loop and closes the pre-discharging loop, thereby avoiding the electric spark at the interface when the load is connected. After the load is connected, whether the load end has overcurrent or short-circuit faults or not is judged in advance through the discharge current of the pre-discharge loop, and the main discharge loop is not closed when the overcurrent or short-circuit faults exist, so that the main discharge loop can be stopped from being closed when the overcurrent or short-circuit exists outside practically, the impact on a system is eliminated, the reliability of the system is improved, and the cost is saved.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of these terms and expressions is not meant to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible and are intended to be included within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that while the present invention has been described with reference to the particular embodiments presently, it will be appreciated by those skilled in the art that the above embodiments are provided for illustration only and that various equivalent changes or substitutions may be made without departing from the spirit of the invention, and therefore, the changes and modifications to the above embodiments shall fall within the scope of the claims of the present application as long as they are within the true spirit of the invention.
Claims (10)
1. A discharge control method for a lithium battery management system, the discharge control method comprising the steps of:
1) Providing a main discharge loop and a pre-discharge loop, wherein two ends of the main discharge loop are coupled with two ends of the pre-discharge loop;
2) When the load is not connected to the lithium battery management system, the main discharging loop is disconnected;
3) Closing a pre-discharge loop;
4) After the load is connected to the lithium battery management system, carrying out small current detection on the closed pre-discharge loop, and if a small current signal is detected, executing the step 5); if no small current signal is detected, returning to the step 2);
5) Detecting whether an overcurrent or short-circuit signal exists, and if so, executing the step 6); if no overcurrent or short-circuit signal is detected, executing the step 7);
6) Disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step 3); if the load is not removed, continuing to detect until the load is removed;
7) Closing the main discharge loop and opening the pre-discharge loop.
2. The discharge control method for a lithium battery management system according to claim 1, further comprising:
a small current detection loop, an overcurrent and short circuit detection loop, and a load detection loop are provided.
3. The discharge control method for a lithium battery management system according to claim 2, further comprising:
one end of the small current detection loop is coupled between the pre-discharge loop and the load, and the other end of the small current detection loop is coupled with the control unit.
4. The discharge control method for a lithium battery management system according to claim 1, further comprising:
one end of the over-current and short-circuit detection loop is coupled between the pre-discharge loop and the load, and the other end of the over-current and short-circuit detection loop is coupled with the control unit.
5. The discharge control method for a lithium battery management system according to claim 1, further comprising:
one end of the load detection loop is coupled between the pre-discharge loop and the load, and the other end of the load detection loop is coupled with the control unit.
6. The discharge control method for a lithium battery management system according to claim 1, further comprising:
one end of the main discharging loop is coupled with the negative electrode of the lithium battery pack in the lithium battery management system, and the other end of the main discharging loop is coupled with the negative electrode of the load.
7. The discharge control method for a lithium battery management system according to claim 1, further comprising:
one end of the pre-discharge loop is coupled with the negative electrode of the lithium battery pack in the lithium battery management system, and the other end of the pre-discharge loop is coupled with the negative electrode of the load.
8. A discharge system for a lithium battery management system, the discharge system coupled to a load, the discharge system comprising:
a lithium battery pack including a positive electrode and a negative electrode; the positive electrode of the lithium battery pack is coupled with the positive electrode of the load;
the two ends of the main discharge loop are respectively coupled with the negative electrode of the lithium battery pack and the negative electrode of the load;
the two ends of the pre-discharge loop are coupled with the two ends of the main discharge loop;
the small current detection loop is connected between the pre-discharge loop and the load at one end and the control unit at the other end, and is used for detecting whether small current exists in the pre-discharge loop or not and feeding back a detection result to the control unit;
the over-current and short-circuit detection circuit is used for detecting whether the over-current and short-circuit condition exists in the pre-discharge circuit or not and feeding back a detection result to the control unit;
the load detection loop is used for detecting whether the load is removed or not and feeding back a detection result to the control unit;
and the control unit is used for controlling the opening or closing of the main discharge loop and the pre-discharge loop according to the detection results of the small current detection loop, the overcurrent and short circuit detection loop and the load detection loop.
9. The discharging system for a lithium battery management system according to claim 8, wherein the control unit controls opening or closing of the main discharging circuit and the pre-discharging circuit according to the detection result, comprising the steps of:
a. when the load is not connected to the lithium battery management system, the control unit disconnects the main discharge loop;
b. the control unit closes the pre-discharge loop;
c. d, performing small current detection after the load is connected to a lithium battery management system, and executing the step d if the control unit detects that a small current signal exists in the small current detection loop; if no small current signal is detected, returning to the step a;
d. detecting whether the overcurrent and short-circuit detection loop has an overcurrent or short-circuit signal, and if so, executing the step e; if no overcurrent or short-circuit signal is detected, executing the step f;
e. disconnecting the pre-discharge loop and continuously detecting whether the load has been removed; if the load is removed, returning to the step a, namely re-closing the pre-discharge loop and detecting a current signal; if the load is not removed, continuing to detect until the load is removed;
f. closing the main discharge loop and opening the pre-discharge loop.
10. The discharge system for a lithium battery management system of claim 8, wherein the pre-discharge loop includes a current limiting unit for limiting current in the prevention circuit when an overcurrent or short circuit signal occurs.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010403796.0A CN111478404B (en) | 2020-05-13 | 2020-05-13 | Discharging system and discharging control method for lithium battery management system |
| TW109122092A TWI748540B (en) | 2020-05-13 | 2020-06-30 | The invention relates to a discharge system and a discharge control method for a lithium battery management system |
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| CN202010403796.0A CN111478404B (en) | 2020-05-13 | 2020-05-13 | Discharging system and discharging control method for lithium battery management system |
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| CN110138200A (en) * | 2019-06-24 | 2019-08-16 | 深圳前海云充科技有限公司 | A kind of load of automatic sensing, Auto Power On inverter electricity saving method |
| CN110265738A (en) * | 2019-06-28 | 2019-09-20 | 山东精工电子科技有限公司 | Lithium battery group control system and lithium battery and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI748540B (en) | 2021-12-01 |
| CN111478404A (en) | 2020-07-31 |
| TW202143596A (en) | 2021-11-16 |
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