TWI405384B - Active type cell charging equalizing method for battery packs - Google Patents

Abstract

An active-type cell charging equalizing method for battery packs measures electric quantity for a plurality of serial-connected rechargeable batteries and defines a judgment rule by setting high and low electric quantity parameters. The total quantity of residual electricity of the rechargeable batteries is determined simultaneously according to the judgment rule for choosing charge mode for the rechargeable batteries. Thereby heavy power charge for all rechargeable batteries or low power charge for individual or a plurality of rechargeable batteries is decided by the quantity of electricity in the rechargeable batteries so as to rapidly charge rechargeable batteries with equipotential and without losing any electricity.

Description

Battery pack active potential equalization charging method

The invention relates to a charging method, in particular to a battery pack active potential equalization charging method.

According to the current energy shortage, especially oil resources, and conventional transportation vehicles are driven by oil as fuel, but because of the environmental pollution caused by the burning of oil, in order to reduce this pollution, oil and electricity mixing has been developed. Power transportation vehicles, or purely electric driving vehicles, are the main problems that must be overcome in power storage and charging to extend the service life of rechargeable batteries.

Conventional rechargeable batteries often use different potential characteristics and usage conditions when they are used in series. Therefore, the performance of the entire battery is degraded, so a potential balance circuit (or potential equalizer) is derived. Improve this phenomenon.

In the conventional potential balance, the passive resistance leakage balance method is used as a balance. When charging, when the voltage of the single rechargeable battery in the battery pack reaches the set upper limit, the single rechargeable battery in the rechargeable battery pack has a higher power. The discharge operation is performed to achieve the potential balance, but the balance current is about 50 mA-200 mA due to the heat dissipation factor. For the current large capacity (ampere/hour) lithium battery, the balance current is too small. It has no obvious effect. Secondly, the balance time is too long, and the effect is not good in practical application. The above passive resistance leakage balance method has been disclosed in the European Patent Patent Publication No. EP1367688B1, and the US Patent Publication No. In the case of the patent case No. US2003222619 and the patent case No. CN101162792 of the mainland, it is a space in which the shortcomings of the prior art need to be improved.

The main object of the present invention is to provide a battery pack active potential equalization charging method, which can charge a majority or a single rechargeable battery through a power charger of different sizes for a plurality of rechargeable batteries. The potential of the rechargeable batteries can be made to be nearly equipotential.

In the battery pack active potential equalization charging method of the present invention, the main steps include: Step 1: First, the battery is sensed for a plurality of rechargeable batteries connected in series, and the voltage, current or temperature of the rechargeable battery is used. At least one of the estimated total state of charge of the rechargeable battery, wherein the total state of charge of the rechargeable battery defines a high power parameter and a low battery parameter, and can be classified according to the high and low power parameters. At least one of the first determining rule and the second determining rule is formed by one of the determining rule groups; Step 2: determining the total residual power of the rechargeable batteries according to the determining rule group and performing the following actions, wherein if the first action is met When judging the rules, a whole set of chargers is selected to charge the rechargeable batteries, and the charging voltage of the whole set of chargers is greater than the saturation voltage of the rechargeable batteries, and at the same time of charging, and continuing to follow the judgment rule group Determining the total residual power of the rechargeable batteries, if the second determination rule is met, stopping charging of the entire set of chargers, and selecting at least The single-core charger charges at least one rechargeable battery, and the charging voltage of the whole set of chargers is much larger than the charging voltage of the single-core charger, and the charging voltage of the single-core charger is at least greater than that of the single rechargeable battery. The saturation voltage is simultaneously charged, and the residual power of the rechargeable batteries is continuously determined according to the determination rule group. If none of the first and second determination rules are met, the charging operation is completed.

Thereby, all the rechargeable batteries can be charged with high power through the whole set of chargers, and further switched to the single-core charger to charge a small power of individual or multiple rechargeable batteries, thereby making the rechargeable batteries It can achieve the purpose of fast charging, and its potential can reach nearly the same potential.

First, please refer to the first figure, which is a flow chart of the charging method of the present invention, which comprises the following steps: Step 1: firstly, for a plurality of rechargeable batteries connected in series, the battery is sensed by the battery. At least one of the voltage, the current, or the temperature is used to estimate the total state of charge of the rechargeable battery. In the embodiment of the present invention, the total residual power of the rechargeable battery is performed through the voltage, current, and temperature of the rechargeable battery. The high-capacity parameter and the low-power parameter are defined in the embodiment of the present invention. The high-battery parameter and the low-battery parameter are the remaining battery capacity of the rechargeable battery. State of charge (SOC), and the high-power parameter is from 90% to 95%, and the low-power parameter is from 60% to 70%, and can be classified according to the high and low power parameters. Forming a judgment rule group consisting of a first judgment rule and a second judgment rule, wherein the first judgment rule is a percentage of the residual power of the rechargeable battery to the full charge (State of The charge, SOC) is less than or equal to the low battery parameter, and the second determination rule is that the state of charge (SOC) of the rechargeable battery is greater than the low battery parameter and less than or equal to the high battery parameter.

Step 2: determining the total residual power of the rechargeable batteries according to the judgment rule group and performing the following actions, wherein if the first determination rule is met, the entire set of chargers is selected to charge the rechargeable batteries, and The charging voltage of the whole set of chargers is greater than the saturation voltage of the rechargeable batteries, and at the same time of charging, further determining whether the charging current of the whole set of chargers is less than a first set value, if less than the When the first set value is used, the remaining power of the rechargeable batteries is continuously determined according to the determining rule group. If the first set value is greater than the first set value, the charging operation of the entire set of chargers is continued, and if the second set is met, When the rule is judged, the charging action of the whole set of chargers is stopped, and at least one single-cell charger is used to charge at least one rechargeable battery, and the charging voltage of the whole set of chargers is much larger than the charging of the single-core charger. Voltage, at the same time, the charging voltage of the single-core charger is at least greater than the saturation voltage of the single rechargeable battery, and at the same time of charging, further determining each charging Whether at least one of the voltage, the current, or the temperature of the pool is greater than a second set value, and in the embodiment of the present invention, each of the rechargeable batteries is jointly determined by voltage, current, and temperature, and if less than the second set value, continuing Performing the charging operation of the single-core charger, if it is greater than the second set value, completing the charging operation, and ending the charging operation of the single-core chargers, and after ending the charging operation of the single-core chargers, That is to say, the total residual power of the rechargeable batteries is higher than the high-power parameter, so that the first and second determination rules are not met, and further, the rechargeable batteries will continue to perform the power sensing.

For a further understanding of the structural features of the present invention, the application of the technical means, and the desired effect of the present invention, the manner of use of the present invention will be described. It is believed that the present invention may be more deeply and specifically understood as follows: As shown in the first figure, in the implementation of the present invention, the first battery is first sensed by the battery, and the first and second determination rules are defined by the set high and low power parameters. In the example, the percentage of the electricity of the high-power parameter is 90%, and the percentage of the electricity of the low-power parameter is 70%, and the rechargeable batteries are charged according to the remaining amount of electricity, wherein, if When the percentage of charge of the rechargeable batteries is less than or equal to 70% (the total residual power of the rechargeable batteries is low), the entire set of chargers is used for high-power charging of the rechargeable batteries, so that rapid charging can be achieved. Purpose, and at the same time of charging, it is determined whether the charging current of the whole set of chargers exceeds the first set value, and if it is less than the first set value, the return feeling The state of charge of the rechargeable batteries, and determining the residual power of the rechargeable batteries according to the determining rule group, and if greater than the set value, continuing to charge the entire set of chargers, and the first set value is The discriminating system is that when the rechargeable batteries are charged, if the amount of charge accumulated is increased, the charging current of the entire group of chargers is reduced, so the first set value can be used to determine whether the entire set of chargers is Continuous charging, and if the percentage of the charge of the rechargeable battery is greater than 70% and less than or equal to 90% at the same time (the total residual charge of the rechargeable batteries is medium), then at least one single-core charger is selected for at least A rechargeable battery is used for low-power charging, so that the potential of the rechargeable batteries can reach a nearly equipotential effect, and the method is charged by the single-cell charging unit for the insufficiency of the rechargeable batteries. Loss of any amount of electricity does not cause thermal buildup as in the conventional resistor leakage balance method. In this embodiment, the single-core charger has a plurality of, and the single-core chargers and the chargers The battery can be selectively charged to a single rechargeable battery with a single single-cell charger, to a single rechargeable battery with a single single-core charger, or to a single rechargeable battery with a plurality of single-core chargers. And determining whether the voltage, current and temperature of each rechargeable battery are greater than the second set value, and if less than the second set value, continuing the charging operation of the single-core charger, if greater than the second set value , then complete the charging action.

Hereafter, the features of the present invention and its achievable efficacy are stated as follows:

1. The active potential equalization charging method of the battery pack of the present invention can first charge all rechargeable batteries with high power through the whole set of chargers, and further switch to the single core charger for individual or multiple rechargeable batteries. The charging of low power is performed, so that the rechargeable batteries can achieve the purpose of fast charging, and the potential can reach the effect of nearly equipotential.

2. The active potential equalization charging method of the battery pack of the present invention is charged by the single-core charging unit for the inadequacies of the rechargeable batteries, so that no power is wasted and unnecessary heat accumulation is generated.

In summary, the present invention has excellent advancement and practicability in similar products, and at the same time, the technical materials of such structures are frequently investigated at home and abroad, and the same or similar structures are not found in the literature. Therefore, the present invention already has the invention patent requirements, and the application is filed according to law.

However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and the equivalent structural changes of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

The first figure is a flow chart of the charging method of the present invention.

Claims (10)

A battery pack active potential equalization charging method, the main steps of which include: Step 1: Firstly, for a plurality of rechargeable batteries connected in series, the power is sensed, and the voltage, current or temperature of the rechargeable battery is at least The first is to estimate the total power state of the remaining rechargeable batteries, wherein the saturated total power of the rechargeable batteries defines a high power parameter and a low power parameter, and can be classified according to the high and low power parameters. a first judgment rule and a second judgment rule are formed by one of the judgment rule groups; Step 2: determining the total residual power of the rechargeable batteries according to the judgment rule group and performing the following actions, wherein if the first judgment is met In the case of rules, a whole set of chargers is used to charge the rechargeable batteries, and the charging voltage of the whole set of chargers is greater than the saturation voltage of the rechargeable batteries, and at the same time of charging, and continuously judged according to the judgment rule group If the total residual power of the rechargeable batteries meets the second determination rule, the charging action of the entire group of chargers is stopped, and at least one is selected. The core charger charges at least one rechargeable battery, and the charging voltage of the whole set of chargers is much larger than the charging voltage of the single-core charger, and the charging voltage of the single-core charger is at least greater than the saturation of the single rechargeable battery. The voltage is simultaneously charged, and the residual power of the rechargeable batteries is continuously determined according to the determination rule group. If none of the first and second determination rules are met, the charging operation is completed. The battery pack active potential equalization charging method according to claim 1, wherein the high power parameter is a state of charge (SOC) of the rechargeable battery to a full charge (State of charge, SOC), and the The high power parameter is from 90% to 95%. The battery pack active potential equalization charging method according to claim 1, wherein the low battery parameter is a state of charge (SOC) of the rechargeable battery to a full charge (State of charge, SOC), and the The low battery parameter is from 60% to 70%. According to the battery pack active potential equalization charging method described in claim 1, wherein the first determination rule is that the residual power of the rechargeable battery is less than or equal to a state of charge (SOC) The low battery parameter. According to the battery pack active potential equalization charging method described in claim 1, wherein the second determination rule is that the residual power of the rechargeable battery is greater than the percentage of the full charge (State of charge, SOC). The low battery parameter is less than or equal to the high battery parameter. The battery pack active potential equalization charging method according to the first aspect of the patent application, wherein, when the first set of judgment rules is met, and the entire group of chargers charges the rechargeable batteries, the whole is further determined. Whether the charging current of the rechargeable battery is less than a first set value, and if it is less than the first set value, continuously determining the residual power of the rechargeable battery according to the determining rule group, if the first setting is greater than the first setting When the value is up, the charging operation of the entire group of chargers is continued. The battery pack active potential equalization charging method according to the first aspect of the patent application, wherein, in accordance with the second determination rule, and the single-core charger charges the rechargeable battery, further determining each charging Whether at least one of the voltage, current or temperature of the battery is greater than a second set value, and if less than the second set value, continuing the charging operation of the single-core charger, if greater than the second set value, completing Charging action. The battery pack active potential equalization charging method according to claim 1, wherein each single-core charger is charged for each rechargeable battery. The battery pack active potential equalization charging method according to claim 1, wherein each single-core charger is charged for a plurality of rechargeable batteries. The battery pack active potential equalization charging method according to claim 1, wherein a plurality of single-core chargers charge a plurality of rechargeable batteries.