CN111129626B - Low-voltage threshold adjusting method - Google Patents
Low-voltage threshold adjusting method Download PDFInfo
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- CN111129626B CN111129626B CN201811276919.8A CN201811276919A CN111129626B CN 111129626 B CN111129626 B CN 111129626B CN 201811276919 A CN201811276919 A CN 201811276919A CN 111129626 B CN111129626 B CN 111129626B
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- current
- voltage threshold
- low voltage
- threshold value
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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
- H01M10/448—End of discharge regulating measures
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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
-
- 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 provides a low voltage threshold adjusting method, which comprises the following steps: detecting whether the current voltage is lower than a low voltage threshold value; when the current voltage is lower than the low voltage threshold value, detecting whether the current exceeds a preset current threshold value; when the current exceeds a preset current threshold value, detecting whether the current temperature exceeds a preset temperature; checking whether the current charge value is higher than a preset charge value or not when the current temperature does not exceed the preset temperature; and when the current charge value is higher than the preset charge value, reducing the low-voltage threshold value.
Description
Technical Field
The invention relates to a power management technology, in particular to a low-voltage threshold adjusting method.
Background
Generally, battery management has measures for measuring voltage, preventing overcharge, overdischarge (low voltage protection), detecting temperature abnormality, etc. to prevent irreparable damage of the battery. For example, when the battery management system detects an over-discharge condition, the battery management system stops continuing the discharge to avoid the situation that the internal pressure of the battery is too high to affect the activity of the internal positive and negative ions. However, in case of sudden passing of large current, the positive and negative ions in the battery will change instantaneously and the voltage will suddenly decrease rapidly. If the voltage drops below the low voltage threshold, the battery management system stops discharging the battery. However, in most cases, the voltage of the battery will rise after the large current is removed. That is, the battery still has a condition for safe discharge but is forced to stop outputting current, thereby causing unnecessary trouble to the user.
Disclosure of Invention
The invention provides a low voltage threshold adjusting method, which can reduce unnecessary trouble of power consumers caused by current output failure of a battery due to low voltage temporarily by dynamically adjusting a low voltage threshold value.
The invention relates to a low voltage threshold adjustment method, which comprises the following steps. Detecting whether the current voltage is lower than a low voltage threshold value; when the current voltage is lower than the low voltage threshold value, detecting whether the current exceeds a preset current threshold value; when the current exceeds a preset current threshold value, detecting whether the current temperature exceeds a preset temperature; checking whether the current charge value is higher than a preset charge value or not when the current temperature does not exceed the preset temperature; and when the current charge value is higher than the preset charge value, reducing the low-voltage threshold value.
Based on the above, the low voltage threshold adjustment method of the present invention further determines whether the voltage of the battery is too low or not due to too large current when the voltage of the battery is lower than the low voltage threshold. If the safety of battery discharge is ensured, the voltage threshold is further reduced, and the situation that the battery stops outputting current under the condition of safety discharge is reduced.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a flowchart illustrating a low voltage threshold adjustment method according to an embodiment of the invention.
The reference numbers illustrate:
s110 to S170: step (ii) of
Detailed Description
Fig. 1 is a flowchart illustrating a low voltage threshold adjustment method according to an embodiment of the invention. In this embodiment, the low voltage threshold adjustment method is suitable for use in a battery management system circuit. The battery management system circuit is formed by combining a controller chip, a monitoring chip and a diode connected with a battery together. Also, the low voltage threshold adjustment method may be performed by, for example, a controller chip of the battery management system circuit, or may be performed by a chip that is independent and connected to the battery management system circuit, but the invention is not limited thereto.
Referring to fig. 1, during the process of using the battery, the battery management system circuit will continuously detect the current voltage value of the battery. Specifically, in step S110, the battery management system circuit detects whether the current voltage is lower than the low voltage threshold. If the current voltage value is not lower than the low voltage threshold value, which indicates that there is no risk of the battery being too low, the battery management system executes step S170 to allow the battery to continue discharging, and ends the process.
For example, in one embodiment of the present invention, the predetermined low voltage threshold is, for example, 2.7 volts (V). The battery management system allows the battery to continue to discharge if the battery management system circuitry detects that the current voltage is at a value of 3 volts. However, if the battery management system circuit detects that the current voltage is 2.65 v, the battery management system circuit will continue to perform the following process.
However, in step S120, once the value of the current voltage is lower than the low voltage threshold, the battery management system circuit detects whether the current exceeds the predetermined current threshold, thereby determining whether the cause of the current voltage decrease is caused by an instantaneous excessive current. If the current does not exceed the predetermined current threshold, it indicates that the current is lower than the low voltage threshold due to normal discharge to the low current threshold. Therefore, the battery management system circuit executes step S160, enables the low voltage protection routine, and ends the flow.
For example, in one embodiment of the present invention, if the rated current is 1 (i.e. 1C), the predetermined current threshold is, for example, 1.5C or 2C. Taking the preset current threshold value of 1.5C as an example, if the battery management system circuit determines that the current is 1.2C, the battery management system circuit executes step S160 to start the low voltage protection procedure, and ends the process.
If the current is 1.7C, which indicates that the voltage is too low due to the instantaneous excessive current, the battery management system circuit will continue to perform the following process.
In step S130, the battery management system circuit detects whether the current temperature exceeds a preset temperature. If the current temperature exceeds the preset temperature, the temperature of the battery is indicated to exceed the safe discharge temperature. If the discharge is resumed, irreversible chemical changes inside the battery can result. Therefore, the battery management system circuit executes the low voltage protection procedure and ends the process.
For example, in the present embodiment, the predetermined temperature is, for example, 60 degrees. If the current temperature is detected to be 63 degrees, the battery management system circuit executes step S160 to start the low voltage protection procedure, and ends the process.
However, if the battery management system circuit determines that the current temperature is 55 degrees, it indicates that the battery can still be discharged at a safe temperature, and therefore the battery management system circuit continues to execute the following process.
In step S140, the battery management system circuit further checks whether the current charge value is higher than the preset charge value. Specifically, the State of charge (SOC) reflects the remaining capacity of the battery. If the current charge value is lower than the preset charge value, it indicates that the remaining capacity of the battery is insufficient, and it must be charged.
For example, in the present embodiment, the predetermined charge value is 15%. If the current charge value is detected to be 13%, the battery management system circuit executes step S160 to start the low voltage protection procedure, and ends the process.
If the current charge value is still higher than the preset charge value, it indicates that the residual capacity still exists for discharging. Therefore, the battery management system circuit can judge that the battery can still continue to discharge, and therefore the low voltage threshold value is directly reduced, so that the battery can continue to operate.
For example, in the present embodiment, the predetermined charge value is 15%. If the current charge value is detected to be 33%, the battery management system circuit executes step S150 to lower the low voltage threshold and ends the process. In this embodiment, each time the battery management system circuit adjusts the low voltage threshold, the voltage adjustment value is used as the adjustment range, so that the low voltage threshold is decreased by one unit of the voltage adjustment value or a multiple of the voltage adjustment value. For example, in this embodiment, the voltage adjustment value is 0.2 volts. That is, the low voltage threshold is adjusted from 2.7 volts to 2.5 volts.
In other embodiments of the present invention, when the battery management system circuit adjusts the threshold of the low voltage, the battery management system circuit adjusts the threshold of the low voltage by a multiple of the voltage adjustment value according to the current voltage. For example, if the current voltage is 2.4 volts, the circuit management system circuit adjusts the low voltage threshold from 2.7 volts down by two units of voltage adjustment, i.e., 2.3 volts.
In other embodiments of the present invention, the battery management system circuit directly adjusts the low voltage threshold to the current voltage when adjusting the low voltage threshold. For example, if the current voltage is 2.4 volts, the circuit management system circuit directly adjusts the low voltage threshold to 2.4 volts. However, the present invention is not limited to the foregoing embodiments.
It should be noted that, in an embodiment of the present invention, after the battery management system circuit lowers the low voltage threshold, the step S110 is still continuously executed, that is, whether the current voltage is lower than the low voltage threshold is detected. If the current voltage is again lower than the low voltage threshold, the battery management system circuit will again execute steps S110 to S160 to determine whether the cause of the voltage drop still comes from the instantaneous current. If the battery management system circuit determines that the current charge value is higher than the predetermined charge value and intends to lower the low voltage threshold value in step S140, the battery management system circuit adjusts the low voltage threshold value down by one unit of voltage adjustment value again, for example, but the invention is not limited thereto.
In addition, in an embodiment of the invention, the battery management system circuit further determines whether the adjusted low voltage threshold is lower than the end-of-discharge voltage. The discharge end voltage is the lowest critical value at which the battery can be safely operated. In detail, the battery management system circuit takes the discharge end voltage as a reference, and adds a buffer voltage value to further set a low voltage threshold value, thereby ensuring the safety of the battery operation. In fact, if the current voltage is lower than the low voltage threshold but higher than the end-of-discharge voltage, the battery can still be discharged under high-safety conditions. If the current voltage is lower than the discharge end voltage, the battery will cause irreversible damage if the discharge continues. Therefore, the battery management system circuit further determines whether the low voltage threshold is not less than the end-of-discharge voltage to avoid excessively adjusting the low voltage threshold.
For example, in one embodiment of the present invention, the discharge termination voltage is, for example, 2 volts. That is, if the adjusted low voltage threshold is lower than 2 v, the battery management system circuit will restore the adjusted low voltage threshold to the low voltage threshold before the adjustment. Alternatively, in other embodiments, the battery management system circuit adjusts the low voltage threshold to the end-of-discharge voltage, i.e., 2 volts. Alternatively, in another embodiment, the battery management system circuit may directly initiate the low voltage protection procedure. The present invention is not limited thereto.
It should be noted that the battery management system circuit stores the initial low voltage threshold in addition to the predetermined low voltage threshold. The initial low voltage threshold is a low voltage threshold set when the battery is shipped from the factory. The adjustment of the low voltage threshold is performed in response to the instantaneous large current when the low voltage threshold adjustment method is operated. Therefore, after detecting the rise of the current voltage, the battery management system circuit further determines whether the current voltage is higher than the initial preset voltage threshold. If the current voltage is higher than the initial preset voltage threshold value, the battery management system circuit adjusts the low voltage threshold value back to the initial preset voltage threshold value to ensure that the low voltage protection program can operate correctly.
In summary, the low voltage threshold adjustment method of the present invention further determines whether the voltage of the battery is too low or not due to too large current when the voltage of the battery is lower than the low voltage threshold. In addition, the low voltage threshold adjustment method further determines the conditions of the output current, such as temperature and charge level (SOC), so as to lower the voltage threshold under the condition that the battery discharge condition is determined to be safe, thereby maintaining the output of the current. Therefore, under the condition of ensuring that the battery is in safe discharge, the situation that the battery stops outputting current under the condition of having safe discharge is also reduced, and the use experience of a user is optimized.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A low voltage threshold adjustment method, comprising:
detecting whether the current voltage is lower than a low voltage threshold value;
when the current voltage is lower than the low voltage threshold value, detecting whether the current exceeds a preset current threshold value;
when the current exceeds the preset current threshold value, detecting whether the current temperature exceeds a preset temperature;
when the current temperature does not exceed the preset temperature, checking whether the current charge value is higher than a preset charge value; and
and when the current charge value is higher than the preset charge value, reducing the low-voltage threshold value.
2. The method of claim 1, wherein if the current does not exceed the predetermined current threshold, or the current temperature exceeds a predetermined temperature, or the current charge is not higher than a predetermined charge, a low voltage protection procedure is initiated.
3. The low voltage threshold adjustment method of claim 1, wherein the predetermined current threshold is 1.5 times the rated current or 2 times the rated current.
4. The low voltage threshold adjustment method of claim 1, wherein the predetermined temperature is 60 degrees.
5. The low voltage threshold adjustment method of claim 1, wherein the low voltage threshold is 2.7 volts.
6. The method of claim 1, wherein the step of decreasing the low voltage threshold is performed according to a voltage adjustment value or a multiple of the voltage adjustment value.
7. The low voltage threshold adjustment method of claim 1, further comprising:
judging whether the adjusted low-voltage threshold value is lower than a discharge termination voltage or not; and
when the adjusted low voltage threshold value is lower than the discharge termination voltage, executing:
restoring the adjusted low voltage threshold value to a low voltage threshold value before adjustment, adjusting the adjusted low voltage threshold value to the discharge termination voltage, or starting a low voltage protection procedure.
8. The low voltage threshold adjustment method of claim 7, wherein the end-of-discharge voltage is 2 volts.
9. The low voltage threshold adjustment method of claim 1, further comprising:
detecting the current voltage rise;
judging whether the current voltage is higher than an initial preset voltage threshold value or not;
and if the current voltage is higher than the initial preset voltage threshold value, adjusting the low voltage threshold value to the initial preset voltage threshold value.
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| CN201811276919.8A CN111129626B (en) | 2018-10-30 | 2018-10-30 | Low-voltage threshold adjusting method |
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| CN201811276919.8A CN111129626B (en) | 2018-10-30 | 2018-10-30 | Low-voltage threshold adjusting method |
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