TWI684775B - Method for processing rsoc of a rechargeable battery - Google Patents

Abstract

A method of processing relative state of charge (RSOC) of a rechargeable battery includes establishing a first comparison table of a plurality of RSOCs of the rechargeable battery and a plurality of open circuit voltages of the rechargeable battery, charging the rechargeable battery using a plurality of sets of charging conditions, each set of charging conditions including a charging voltage and a cutoff current, after the rechargeable battery is charged to an ideal state using a set of charging conditions, measuring an idle voltage of the rechargeable battery, establishing a second comparison table of charging conditions and the idle voltages of the rechargeable battery, generating a plurality of calibration ratios corresponding to the plurality of sets of charging conditions according to the first comparison table and the second comparison table, and multiplying a current RSOC of the rechargeable battery by a corresponding calibration ratio of the plurality of calibration ratios.

Description

Method for processing relative state of charge of rechargeable battery

The invention relates to a method for processing the relative state of charge of a rechargeable battery, in particular to a method for multiplying the relative state of charge by a correction ratio to accurately represent the amount of electricity.

With the advancement of technology and the rapid development of integrated circuits, many electronic devices have been reduced in size. In addition to the basic requirements of lightness and portability, long-term operation has gradually become a necessary requirement. Moreover, these portable electronic devices all require power to operate, and the source of this power is the battery, so how to provide sufficient power for today's portable electronic devices has become one of the important challenges. In addition, because the charging and discharging of the battery are caused by a series of chemical reactions, there are many factors that directly affect the life of the battery during the chemical reaction, such as the ambient temperature of the battery and the output current of the battery. .

The traditional method of dealing with the relative state of charge of the battery is obtained by looking up the table with the open circuit voltage corresponding to the state of charge, but this only applies to the premise that the charger is charged in a conventional manner (such as fixed power such as 5V/2A, 9V/1.8A) . It is a commonly used technology to change the charging conditions to extend the battery life and ensure battery safety during a single charge process. For example, the charging current control method disclosed in Chinese Patent Publication No. CN107785946A, when the battery temperature is too high At the time, reduce the charging current, or change the charging voltage and charging current repeatedly in the final stage of charging in China Patent Publication No. CN105379057A, but the ultimate purpose is to allow the battery to shorten the charging time and extend the battery life in the best balanced state. The battery is charged to the saturation state (that is, the relative state of charge is 100%). However, when the charger cannot charge the battery to the maximum saturation state under certain charging conditions or requirements, even if the battery has been charged It cannot be further charged, but the relative state of charge will still not show 100%, which will cause the user to mistakenly think that the battery still needs to be charged.

An embodiment of the present invention provides a method for processing a relative state of charge of a rechargeable battery, including establishing a first comparison table of a plurality of relative states of charge of the rechargeable battery and a plurality of open circuit voltages of the rechargeable battery; using a plurality of charging conditions Charge the rechargeable battery, each set of charging conditions includes charging voltage and cut-off current; use a set of charging conditions to charge the rechargeable battery to an ideal state, measure the static voltage of the rechargeable battery; establish charging conditions and rechargeable battery A second comparison table of the static voltage, generating a plurality of correction ratios corresponding to the charging conditions of the complex array according to the first comparison table and the second comparison table, and multiplying the immediate relative state of charge of the rechargeable battery by the plurality of correction ratios The correction ratio corresponds to a correction ratio.

100‧‧‧Battery module

10‧‧‧rechargeable battery

12‧‧‧Microcontroller

14‧‧‧Memory

20‧‧‧ Charger

32 to 52‧‧‧ steps

FIG. 1 is a schematic diagram of the battery module of the embodiment.

FIG. 2 is a schematic diagram of the charger of the embodiment charging the rechargeable battery in FIG. 1.

FIG. 3 is a flowchart of a method for processing the relative state of charge of the rechargeable battery in FIG. 1.

FIG. 1 is a schematic diagram of a battery module 100 according to an embodiment. The battery module 100 includes a rechargeable battery 10 and a microcontroller 12, and the microcontroller 12 includes a memory 14.

Table 1

The first table is a comparison table of the open-circuit voltage of the battery 10 and the relative state of charge. The first table is stored in the memory 14 of the microcontroller 12, in the first table, each open circuit voltage of the rechargeable battery 10 corresponds to a relative state of charge (RSOC), and each relative state of charge Corresponds to an open circuit voltage. The relative state of charge refers to the ratio of the current charge in the battery 10 to the maximum charge of the battery 10, expressed as a percentage. The relative state of charge ranges from 0% to 100%. When the battery 10 is fully charged, the relative state of charge is 100%; when the battery 10 is fully discharged, the relative state of charge is 0%. The open circuit voltage of the battery 10 is the potential difference between the positive electrode and the negative electrode of the battery 10 after the battery 10 is disconnected and allowed to stand for a period of time, that is, after no current passes through the two electrodes for a period of time. Therefore, by looking up the first table, we can see that when the relative state of charge is 100%, the open circuit voltage is 4150mV, and when the relative state of charge is 98%, the open circuit voltage is 4133mV. Therefore, when measuring the current open circuit voltage of the battery 10, by looking up the first table, the relative state of charge of the battery 10 can be known. For example, when the measured open circuit voltage is 4150mV, the relative state of charge is 100%; when the measured open circuit voltage is 4133mV, the relative state of charge is 98%; when the measured open circuit voltage is 4116mV, The relative state of charge is 96%, and so on.

FIG. 2 is a schematic diagram of a charger 20 charging a rechargeable battery 10 according to an embodiment. When the charger 20 charges the rechargeable battery 10, the charger 20 charges the battery 10 under a charging condition, and the charging condition includes a charging voltage ( charging voltage) and a cutoff current, the charging voltage is the constant voltage provided by the charger 20 when charging the battery 10; the cutoff current is when the charger 20 charges the battery 10 using the charging voltage, when the current is less than the set cutoff current At this time, the charger 20 stops the current charging the battery 10. The charging conditions can be controlled by the microcontroller 12 or the charger 20.

The second table is a comparison table between the charging conditions of the battery 10 and the idle voltage. As shown in Table 2, the static voltage of the battery 10 refers to when the charger 20 uses a charging condition to charge the battery 10 to the ideal state of the battery 10, and after standing for a period of time, the two poles of the battery 10 are measured The voltage. For example, when the charger 20 uses a charging condition of a charging voltage of 4180 mV and a cut-off current of 1 A to charge the rechargeable battery 10 to an ideal state, the measured static voltage is 4150 mV; when the charger 20 uses a charging voltage of 4170 mV and After charging the rechargeable battery 10 to an ideal state with the charging condition of cut-off current 0.9A, the measured static voltage is 4140mV; when the charger 20 uses the charging condition of the charging voltage 4160mV and the cut-off current 0.8A to charge the rechargeable battery 10 After reaching the ideal state, the measured static voltage is 4130mV, and so on. Under the charging condition that the charging voltage is 4170mV and the cut-off current is 0.9A, although the charger 20 has actually charged the rechargeable battery 10 to an ideal state, the static voltage of the rechargeable battery 10 is only 4140mV, less than 4150mV, and there is no Achieve 100% relative state of charge. The ideal state of the battery 10 refers to the maximum state of the battery voltage that can be reached by the battery 10 under a charging condition.

The third table is a comparison table of charging conditions, static voltage, and relative state of charge of the battery 10. After the second table is generated, the corresponding state of charge corresponding to the charging conditions listed in the second table can be generated by interpolation according to the first table. For example, if the charging voltage is 4170mV and the cut-off current is 0.9A, the relative charge state of the static voltage is 4140mV under the linear formula:

RSOC=98.82%

That is 98.82% listed in Table 3.

If the charging voltage is 4160mV and the cut-off current is 0.8A, the relative charge state of the static voltage of 4130mV will be as follows:

RSOC=97.65%

That is 97.65% listed in Table 3.

The fourth table is on the third table, and a comparison table showing the reciprocal of the relative state of charge. It can be seen from Table 4 that when the relative state of charge is equal to 98.82%, the reciprocal is 100/98.82; when the relative state of charge, etc. At 97.65%, the reciprocal is 100/97.65. The reciprocal of the relative state of charge is the corresponding correction ratio under a certain charging condition. For example, when the charger 20 uses a charging condition of a charging voltage of 4180mV and a cut-off current of 1A to charge the rechargeable battery 10 to an ideal state, the static voltage measured under this condition is 4150mV, corresponding to a relative state of charge of 100 %, so no correction is needed. When the rechargeable battery 10 is charged to an ideal state using a charging voltage of 4170mV and a cut-off current of 0.9A, the measured static voltage is 4140mV, the relative state of charge is 98.82%, and the correction ratio is its reciprocal 100/98.82. In other words, when the rechargeable battery 10 is charged to an ideal state with a charging voltage of 4170mV and a cut-off current of 0.9A, although the relative state of charge is only 98.82%, which does not reach 100%, in order to let the user understand the battery 10 After being charged to the ideal state under this charging condition, the display screen will show that the saturation of the battery 10 has reached 100%, and this 100% is obtained by the following formula: .98.82%×(100/98.82)=100%

In this way, the battery 10 can be prevented from being charged to an ideal state, and the user mistakenly thinks that the battery 10 still needs to be charged and overcharges the battery 10.

The embodiment can not only generate the relative charge states corresponding to the charging conditions listed in Table 2 according to the first table by interpolation, but also generate the corresponding correction ratios for the charging conditions listed in Table 4 by interpolation, in This will not be repeated here.

FIG. 3 is a flowchart of a method 30 for processing the relative state of charge of the rechargeable battery 10 of the embodiment, which may include the following steps: Step 32: Establish a plurality of relative states of charge of the rechargeable battery 10 and a plurality of states of the rechargeable battery 10 Comparison table of open circuit voltages (as shown in Table 1); Step 34: Charge the rechargeable battery 10 with multiple sets of charging conditions, each group is charged The conditions include a charging voltage and a cut-off current; Step 36: After charging the rechargeable battery 10 to an ideal state using a set of charging conditions, measuring a static voltage of the rechargeable battery 10, the ideal state may be the rechargeable battery 10 The best state after charging under this set of charging conditions; Step 38: Establish a comparison table of complex charging conditions and a plurality of static voltages of the rechargeable battery 10 (as shown in Table 2); Step 40: According to the first The table generates a plurality of relative states of charge of a plurality of static voltages (as shown in Table 3); Step 42: Generate a plurality of plural reciprocals of a relative state of charge (as shown in Table 4), which corresponds to the complex number Correction ratio of each charging condition; Step 44: Store the charging condition, static voltage, relative state of charge and correction ratio in the memory 14; Step 46: Use a set of charging conditions to charge the rechargeable battery 10 to an ideal state; Step 48 : Obtain the relative state of charge corresponding to the ideal state of step 46; Step 50: Obtain the correction ratio corresponding to the set of charging conditions in step 46; Step 52: Multiply the immediate relative state of charge of the rechargeable battery 10 by the correction obtained in step 50 proportion.

When the charger 20 uses a set of charging conditions to charge the rechargeable battery 10, the microcontroller 12 will find the corresponding correction ratio according to the set of charging conditions, and multiply the immediate relative state of charge of the rechargeable battery 10 by this correction ratio. You can get the corrected immediate relative state of charge. In this way, when the battery 10 has been charged to the ideal state, the user can know through the display screen that the battery 10 has been charged to the ideal state, and the battery 10 is no longer continuously charged.

The above are only the preferred embodiments of the present invention, and all changes made in accordance with the scope of the patent application of the present invention And modifications shall fall within the scope of the present invention.

32 to 52‧‧‧ steps

Claims (9)

A method for processing the relative state of charge of a rechargeable battery includes: establishing a first comparison table of the plurality of relative states of charge of the rechargeable battery and the plurality of open circuit voltages of the rechargeable battery; The rechargeable battery is charged, and each set of charging conditions includes a charging voltage and a cut-off current; after each of the sets of charging conditions is used to charge the rechargeable battery to an ideal state, a measurement of the rechargeable battery is performed. Static voltage; establishing a second comparison table of the plurality of charging conditions of the sets of charging conditions and the plurality of static voltages of the rechargeable battery; and generating corresponding to the sets of charging conditions according to the first comparison table and the second comparison table Plural correction ratios; the charging voltage of these groups of charging conditions is different. The method of claim 1, wherein the correction ratio corresponding to the sets of charging conditions is a plurality of reciprocals of the relative states of charge that generate the static voltages. The method of claim 1, wherein the sets of charging conditions are controlled by a microcontroller or a charger. The method according to claim 1, wherein when the static voltage is different from several open-circuit voltages in the first look-up table, the set of charging conditions is obtained by interpolating the static voltage according to two of the open-circuit voltages Correction ratio. The method of claim 1, wherein generating a correction ratio corresponding to the sets of charging conditions according to the first look-up table and the second look-up table includes when one of the sets of charging conditions is between the sets When two adjacent charging conditions are among the charging conditions, the correction ratio of the set of charging conditions is obtained by interpolation according to the correction ratio corresponding to the two charging conditions. The method according to any one of claims 1 to 5, wherein the ideal state is a battery voltage maximum state of the rechargeable battery. A method for correcting the relative state of charge of a rechargeable battery includes: storing a correction ratio corresponding to the charging conditions of a complex array in a memory; using a set of charging conditions to charge the rechargeable battery to an ideal state; obtaining the ideal state correspondence The relative state of charge; obtaining the correction ratio corresponding to the group of charging conditions; and multiplying one of the rechargeable batteries' immediate relative state of charge by the correction ratio value; wherein the correction ratio corresponding to the group of charging conditions is to generate the static Set the reciprocal of these relative states of charge. The method according to claim 7, wherein when the set of charging conditions is between two adjacent charging conditions in the sets of charging conditions, the interpolation ratio is used to obtain the correction ratio corresponding to the two charging conditions The correction ratio of the charging conditions of the group. The method according to claim 7 or 8, wherein the ideal state is a battery voltage maximum state of the rechargeable battery.

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