JPH0898426A - Battery charging method - Google Patents

Battery charging method

Info

Publication number
JPH0898426A
JPH0898426A JP6226707A JP22670794A JPH0898426A JP H0898426 A JPH0898426 A JP H0898426A JP 6226707 A JP6226707 A JP 6226707A JP 22670794 A JP22670794 A JP 22670794A JP H0898426 A JPH0898426 A JP H0898426A
Authority
JP
Japan
Prior art keywords
charging
battery
temperature
stage
amount
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6226707A
Other languages
Japanese (ja)
Inventor
Koichiro Hara
Koji Nakamura
好志 中村
浩一郎 原
Original Assignee
Aisin Seiki Co Ltd
Toyota Motor Corp
アイシン精機株式会社
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd, Toyota Motor Corp, アイシン精機株式会社, トヨタ自動車株式会社 filed Critical Aisin Seiki Co Ltd
Priority to JP6226707A priority Critical patent/JPH0898426A/en
Publication of JPH0898426A publication Critical patent/JPH0898426A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Abstract] [Purpose] To provide a charging method capable of shortening charging time while preventing deterioration of a battery. [Configuration] Battery temperature and battery charge state are detected. An amount of electricity to be charged is calculated based on the detected battery charge state. Based on the battery temperature and the amount of electricity to be charged, a charging current at which the battery temperature at the end of charging becomes a predetermined temperature or a predetermined temperature or less is calculated. Charging is performed with the calculated charging current.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of charging a battery while maintaining the battery in a state where the battery does not deteriorate and can be charged efficiently.

[0002]

2. Description of the Related Art As batteries, there are used batteries such as manganese batteries and alkaline batteries which are usually called dry batteries, and so-called secondary batteries, and secondary batteries which can be used again by charging even if discharged. The life of the secondary battery varies greatly depending on the usage condition and the charging condition. For example, in the case of a lead secondary battery, which is a typical example of the latter battery, once the amount of stored electricity becomes 0, deterioration progresses significantly. Deterioration also progresses due to an increase in battery temperature during charging and overcharging.

As described above, in the case of the secondary battery, it is necessary to use and charge the battery in an appropriate state according to the characteristics of the battery. In Japanese Patent Laid-Open No. 4-351428, when a secondary battery is charged, an appropriate charging time is calculated based on the current stored amount of electricity, and a charging time for achieving this charged amount of electricity is calculated to prevent overcharging. Techniques for doing so are disclosed. When calculating the charging time, the current during charging (charging current)
Is done as being constant.

[0004]

As described above, the conventional device has a problem that the charging current is constant, the charging current cannot be increased, and the charging time becomes long. That is, the charging current is fixed to a sufficiently low value in order to suppress the deterioration due to the temperature rise of the battery, and even when it is considered that the charging time is short and the temperature rise is small, the outside temperature during charging is also reduced. Even when the battery temperature is low and the battery is not expected to reach a high temperature, the battery must be charged with the low charging current.

If the battery is charged at a high temperature,
Gas is generated from the electrolytic solution due to electrolysis of water, the electrolytic solution is reduced, and finally the liquid is exhausted, and the battery does not function. This gas generation is more likely to occur as the battery temperature is higher, and therefore the higher the battery temperature during charging, the faster the deterioration of the battery. Further, the charging current is consumed due to the generation of gas, so that the charging efficiency also deteriorates. Also, when the battery temperature is high, lattice corrosion occurs,
This also accelerates the deterioration of the battery.

[0006] As described above, if charging is performed in a state where the battery temperature is high, the efficiency is poor and the deterioration of the battery progresses rapidly. Therefore, it is necessary to set the charging current such that the battery temperature does not become too high during charging. is there. In the device disclosed in the above publication, the charging current is constant, and in consideration of the deterioration of the battery, it is necessary to set the charging current to a low value when it is considered that the charging time is long and the temperature rise is large. Therefore, even when the amount of electricity to be charged is small and charging is completed in a relatively short time, the charging current cannot be increased even though the battery temperature does not rise so much, and the charging time is longer than necessary. There was a problem that sometimes.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a battery charging method capable of shortening the charging time while suppressing deterioration of the battery.

[0008]

In order to achieve the above-mentioned object, a battery charging method according to the present invention comprises a step of detecting a battery temperature, a step of detecting a battery charge state, and the detected battery. Calculating the amount of electricity to be charged based on the state of charge, and calculating the maximum charging current at which the battery temperature at the end of charging falls below a predetermined temperature based on the battery temperature and the amount of electricity to be charged. The method includes a step and a step of performing charging with the calculated charging current.

[0009]

Since the present invention has the above-mentioned structure and can suppress the temperature rise of the battery within a predetermined value, it is possible to prevent the deterioration of the battery due to the temperature rise during charging. Moreover, since the charging current can be increased within the range where the battery deterioration does not occur, the charging time can be shortened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a flow chart of the first embodiment. First, the temperature T a of the battery before the start of charging
Is detected (S10). Further, the battery terminal voltage in the uncharged state is detected (S12), and based on this, the battery storage state (SOC) indicating how much electricity is stored in the battery is calculated (S14).
The SOC is a ratio of the currently stored electricity amount to the electricity amount in a state where the battery is sufficiently stored, and is usually displayed as a percentage. Further, when the SOC is high, that is, when the amount of stored electricity is large, the battery terminal voltage also becomes high, and conversely, when the SOC is low, the terminal voltage becomes low. Therefore, the SOC can be detected by detecting the terminal voltage.
Can be calculated.

Based on the calculated SOC, the amount of electricity (required amount of charge) C to be charged is calculated (S16). Necessary charge amount C is the amount of electricity to be charged to a state in which the battery is sufficiently power storage, plus the equalization charge quantity C s. The amount of electricity to be stored in the battery is calculated from the battery capacity (C full ) and SOC (%).

## EQU1 ## C full * (1-SOC / 100) (1) Further, the equalized charge amount C s is the amount of electricity lost due to gas generation during charging, and the amount of electricity for reducing the variation in the storage state among a plurality of batteries.
If the batteries connected in series are used without any variation in the storage state, the variation becomes even larger, and the deterioration of the specific battery progresses rapidly. Therefore, by charging a little more, the variation of the plurality of batteries is reduced. Therefore, the required charge C
Is

## EQU2 ## C = C full * (1-SOC / 100) + C s (2)

Next, the charge amount C 1 for the first stage charge is calculated based on the required charge amount C (S18). The battery is usually charged in two stages, and in the first half (first stage), the state of charge is rapidly improved with a relatively large charging current.
In the latter half (second stage), the charging current is made relatively low to suppress gas generation and charge efficiently. Also in this embodiment, 2
The charging is performed in stages, and the charging conditions for the second stage are fixed. That is, in the second-stage charging, the charging current and the charging time are fixed to predetermined values, so that the rise in the battery temperature during this period becomes a substantially constant value. Further, since the charging current and the charging time are fixed, the charging amount in the second-stage charging C 2 is also fixed. Therefore, from the required charge amount C and the second-stage charge amount C 2 , the first-stage charge amount C 1 is

## EQU3 ## C 1 = C-C 2 (3)

Next, the first-stage charging current I 1 is assumed (S
20). This assumed value is the maximum charging current that can be generated by the apparatus of the embodiment, and this charging current I 1 and the first-stage charging amount C
1st to 1st stage charging time t 1

## EQU4 ## t 1 = C 1 / I 1 (4)

From the above, the temperature change ΔT 1 when the first-stage charging is performed can be obtained (S22). That is, as shown in FIG. 2, there charging current I 1 charge time t 1 is beforehand prepared a temperature rise characteristic graph showing the temperature change [Delta] T 1 when performing charging, the temperature change from FIG. presume. Then, from the battery temperature T a obtained in step S10 and the temperature change ΔT 1 in the first-stage charging, the battery temperature T 1 at the end of the first-stage charging is

## EQU5 ## T 1 = T a + ΔT 1 (5) is calculated (S24). The battery temperature T 1 at the end of the first stage is compared with the upper limit charge temperature T u1 of the first stage (S26). The first-stage upper-limit temperature T u1 is calculated from the lower-limit temperature (upper-charging upper-limit temperature) T u at which the deterioration of the battery significantly progresses due to gas generation and the temperature change ΔT 2 during the second-stage charging,

[Equation 6] T u1 = T u −ΔT 2 (6) That is, the temperature that should not be exceeded during charging, including the first and second stages, is the charging upper limit temperature T u , and does not exceed this upper limit temperature upper limit temperature T u at the end of the second stage charging. In order to do so, the upper limit temperature T u1 at the end of the first stage is set in anticipation of the temperature ΔT 2 that rises in the second stage charging. Then, if the estimated temperature T 1 at the end of the first-stage charging is equal to or lower than the upper-limit temperature T u1 of the first stage, the charging for the first-stage charging time t 1 is executed with the first-stage charging current I 1. (S28). The second-stage charging is executed immediately after the end of the first-stage charging time (S30). As described above, in the present embodiment, the current and time for the second stage charging are preset fixed values.

On the other hand, if the temperature T 1 at the end of the first-stage charging exceeds the upper limit temperature T u1 of the first stage in step S26,
A lower charging current is assumed again, and the process proceeds to step S22.

The determination of the first-stage charging condition will be described using a concrete example with reference to FIG. The battery has a storage capacity C
full is 50 Ah, the upper limit temperature T u of charging has a performance of 60 ° C.. The charging condition for the second-stage charging is the charging current I
2 is 2.5 A, charging time t 2 is 4 hours, and battery temperature rise ΔT 2 at this time is 10 ° C. And SO
C is 0%, that is, an empty state, the battery temperature T a is 15
Suppose you start charging from ℃. In addition, the equalized charge amount C s
Is 8 Ah. The charging device has a charging current of 12
It can be set to A, 8A, 6A, 2.5A.

The required amount of charge C is 58 Ah from the formula (2), and the amount of charge C 1 of the first stage is further from the formula (3).
Is 48 Ah. The maximum value 12A of the current that can be generated by the charging device is first assumed as the first-stage charging current I 1 . At this time, the charging time t 1 is found to be 4 hours from the equation (4). From FIG. 2, the temperature rise Δ at the end of the first-stage charging at this time Δ
It can be seen that T 1 is 50 ° C. Furthermore, the battery temperature T 1 at the end of the first-stage charging is calculated as 65 ° C. from the equation (5). On the other hand, the first-stage charging upper limit temperature T u1 is calculated as 50 ° C. from the equation (6), and the calculated battery temperature T
1 is significantly higher than this 50 ° C. That is, it can be seen that the assumed charging current I 1 was too high. Therefore, the first-stage charging current I 1 is again assumed to be lower than the previously assumed value. Since the current that can be set in the charging device is discrete as described above, 8 A is assumed as the new first-stage charging current I 1 in this case.

Similarly to the case of assuming 12 A, the first stage charging time t 1 is 6 hours, the temperature rise ΔT 1 at the end of the first stage charging is 35 ° C., and the temperature at this time is 50 ° C. In this case, the first-stage charging upper limit temperature T u1 (= 50 ° C.) is not exceeded, so the first-stage charging is performed under this condition. And
After the completion of the first-stage charging, the second-stage charging is performed under the above-mentioned charging conditions.

According to the above specific example, the temperature T 1 at the end of the first charging is equal to the upper limit temperature T u1 , but when the charging current I 1 can take only discrete values, these are not equal. There is. At this time, the highest charging current is set within a range not exceeding the upper limit temperature T u1 .

FIG. 3 shows a flowchart of the second embodiment according to the present invention. The same steps as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The characteristic of this embodiment is that the state of charge (SOC) of the battery is
The calculation is based on the calculation from the internal resistance of the battery and the calculation of the first-stage charging current I 1 is performed directly without using an assumed value.

The detection of the battery internal resistance (S34) is obtained, for example, by detecting the voltage between the terminals when a certain current flows. Alternatively, it can be obtained by passing an alternating current and measuring the impedance. Since the internal resistance is small when the SOC is high and large when the SOC is low, the SOC can be calculated from the internal resistance by previously obtaining the relationship between the internal resistance and the SOC (S36).

The first-stage charging current I 1 is calculated as follows. In order to charge the first-stage charge amount C 1 calculated in step S18, the current I 1 needs to flow for time t 1 . That is,

## EQU7 ## C 1 = I 1 * t 1 (7) Also, most of the heat generated during this period is Jur heat, so the heat generation amount Q is proportional to the square of the current I 1 ,

## EQU8 ## Q = k 1 * I 1 2 * t 1 (8) Here, k 1 is a proportional constant. further,
The temperature increase ΔT 1 due to this heat generation amount Q is

[Expression 9] ΔT 1 = k 2 * Q (9) (k 2 is a proportional constant) and the above equation (7),
From (8) and (9), the first-stage charging current I 1 is

[Expression 10] I 1 = ΔT 1 / (k 1 * k 2 * C 1 ) ... (10) Since the proportional constant k 1 is determined by the internal resistance of the battery and the proportional constant k 2 is determined by the heat capacity of the battery, if these proportional constants are measured in advance for the same battery, the charging current I 1 will increase the temperature increase ΔT 1
And a function of charge capacity C 1. Furthermore, the rising temperature ΔT 1
Is the difference between the upper limit temperature T u1 at the time of first-stage charging and the battery temperature T a before charging, which is determined by the characteristics of the battery, the battery will not be heated above the upper limit temperature T u during charging. Therefore, equation (10) becomes

[ Equation 11] I 1 = (T u1 −T a ) / (k 1 * k 2 * C 1 ) ... (11), of which the first-stage charging upper limit temperature T u1 and proportional constant k
Since 1 and k 2 are constants determined by the characteristics of the battery as described above, if these are obtained in advance, the first-stage charging current I 1 is the battery temperature T a before charging and the first-stage charging amount C. It can be calculated from 1 (S38).

If the first-stage charging current I 1 is obtained, the first-stage charging time t 1 can be calculated from the equation (7) (S40). The first-stage charging is executed based on these conditions, and when this is completed, the second-stage charging is executed.

As described above, in the two embodiments, it is possible to charge the battery within an appropriate temperature range in consideration of the increase in the battery temperature caused by the charging. Therefore, SO
When C is large and it is not necessary to perform charging so much, the charging time is short and a large current can be passed. In other words, because more current can flow,
The charging time can be shortened. Moreover, since the battery temperature during charging can be kept below a predetermined value, deterioration can be suppressed and the life of the battery can be extended.

In the two embodiments, the method of calculating the state of charge (SOC) of the battery is different, but either method can be used. That is, in the first embodiment, the SOC can be calculated based on the internal resistance of the battery, and in the second embodiment, the SOC can be calculated from the battery terminal voltage.
Furthermore, it is also possible to successively monitor the amount of electricity flowing in and out of the battery and calculate the SOC from this history.

Furthermore, in the two embodiments, the two-stage charging was performed, but it is also possible to perform only one-stage charging. In this case, the calculation may be performed so that the battery temperature at the end of the first stage is the upper limit temperature when charging the battery,
The charging time may be shortened as in the above-described embodiment.

[0028]

As described above, according to the present invention, the temperature rise of the battery can be suppressed within a predetermined value.
It is possible to prevent battery deterioration due to temperature rise during charging. Therefore, the life of the battery can be extended. Moreover, since the charging current can be increased within the range where the battery deterioration does not occur, the charging time can be shortened.

[Brief description of drawings]

FIG. 1 is a flowchart of a first embodiment according to the present invention.

FIG. 2 is a characteristic diagram used when calculating an appropriate charging current in the first embodiment.

FIG. 3 is a flowchart of a second embodiment according to the present invention.

Claims (1)

[Claims]
1. A step of detecting a battery temperature, a step of detecting a battery charge state, a step of calculating an amount of electricity to be charged based on the detected battery charge state, the battery temperature and the charge Based on the amount of electricity, a step of calculating a maximum charging current at which the battery temperature at the end of charging is equal to or lower than a predetermined temperature, and a step of executing charging by the calculated charging current, How to charge the battery.
JP6226707A 1994-09-21 1994-09-21 Battery charging method Pending JPH0898426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6226707A JPH0898426A (en) 1994-09-21 1994-09-21 Battery charging method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6226707A JPH0898426A (en) 1994-09-21 1994-09-21 Battery charging method

Publications (1)

Publication Number Publication Date
JPH0898426A true JPH0898426A (en) 1996-04-12

Family

ID=16849385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6226707A Pending JPH0898426A (en) 1994-09-21 1994-09-21 Battery charging method

Country Status (1)

Country Link
JP (1) JPH0898426A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008136330A (en) * 2006-11-29 2008-06-12 Matsushita Electric Ind Co Ltd Charging system, charger, and battery pack
CN101394103A (en) * 2007-09-19 2009-03-25 联想(新加坡)私人有限公司 Surface temperature dependent battery cell charging system
JP2009081958A (en) * 2007-09-26 2009-04-16 Hitachi Vehicle Energy Ltd Charge/discharge controller
JP2009148046A (en) * 2007-12-12 2009-07-02 Sanyo Electric Co Ltd Charging method
JP2009183105A (en) * 2008-01-31 2009-08-13 Panasonic Corp Charge control circuit, battery pack, and charging system
JP2010121459A (en) * 2008-11-17 2010-06-03 Mitsubishi Motors Corp Idling stop control device
JP2010263676A (en) * 2009-04-30 2010-11-18 Toshiba Corp Information processing apparatus
US7887941B2 (en) 2007-03-05 2011-02-15 Lenovo (Singapore) Pte. Ltd. Battery pack
JP2013106476A (en) * 2011-11-15 2013-05-30 Toshiba Corp Charge and discharge planning system and charge and discharge planning method
JP2013258902A (en) * 2007-12-10 2013-12-26 Bayer Healthcare Llc Fast charge and power supply management of battery-driven fluid sample measuring instrument
CN103682498A (en) * 2013-12-04 2014-03-26 华为终端有限公司 Charging method and electronic device
JP2015133813A (en) * 2014-01-10 2015-07-23 株式会社デンソー Charger
CN106663957A (en) * 2016-03-01 2017-05-10 广东欧珀移动通信有限公司 Charging method, adapter, mobile terminal and charging system
JP2017108522A (en) * 2015-12-09 2017-06-15 本田技研工業株式会社 Charge current setting method, charging method, charger and actuator

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8111035B2 (en) 2006-11-29 2012-02-07 Panasonic Corporation Charging system, charging device and battery pack
JP2008136330A (en) * 2006-11-29 2008-06-12 Matsushita Electric Ind Co Ltd Charging system, charger, and battery pack
US7887941B2 (en) 2007-03-05 2011-02-15 Lenovo (Singapore) Pte. Ltd. Battery pack
US8097356B2 (en) 2007-03-05 2012-01-17 Lenovo (Singapore) Pte. Ltd. Battery pack
CN101394103A (en) * 2007-09-19 2009-03-25 联想(新加坡)私人有限公司 Surface temperature dependent battery cell charging system
JP2009077466A (en) * 2007-09-19 2009-04-09 Lenovo Singapore Pte Ltd Charging system for controlling charge by using surface temperature of battery cell
TWI475781B (en) * 2007-09-19 2015-03-01 Lenovo Singapore Pte Ltd A charging system for charging control of the surface temperature of the battery cell, a charging method, a charging device, a battery pack, and a computer program
JP4660523B2 (en) * 2007-09-19 2011-03-30 レノボ・シンガポール・プライベート・リミテッド Charging system that controls charging at the surface temperature of the battery cell
JP2009081958A (en) * 2007-09-26 2009-04-16 Hitachi Vehicle Energy Ltd Charge/discharge controller
US10050458B2 (en) 2007-12-10 2018-08-14 Ascensia Diabetes Care Holdings Ag Rapid charging and power management of a battery-powered fluid analyte meter
US9667078B2 (en) 2007-12-10 2017-05-30 Ascensia Diabetes Care Holdings Ag Rapid charging and power management of a battery-powered fluid analyte meter
JP2013258902A (en) * 2007-12-10 2013-12-26 Bayer Healthcare Llc Fast charge and power supply management of battery-driven fluid sample measuring instrument
US10320212B2 (en) 2007-12-10 2019-06-11 Ascensia Diabetes Care Holdings Ag Rapid charging and power management of a battery-powered fluid analyte meter
US9312720B2 (en) 2007-12-10 2016-04-12 Ascensia Diabetes Care Holdings Ag Rapid charging and power management of a battery-powered fluid analyte meter
JP2009148046A (en) * 2007-12-12 2009-07-02 Sanyo Electric Co Ltd Charging method
JP2009183105A (en) * 2008-01-31 2009-08-13 Panasonic Corp Charge control circuit, battery pack, and charging system
JP2010121459A (en) * 2008-11-17 2010-06-03 Mitsubishi Motors Corp Idling stop control device
US8035351B2 (en) 2009-04-30 2011-10-11 Kabushiki Kaisha Toshiba Information processing apparatus
JP2011078307A (en) * 2009-04-30 2011-04-14 Toshiba Corp Information processing device and charging method
JP4635094B2 (en) * 2009-04-30 2011-02-23 株式会社東芝 Information processing device
JP2010263676A (en) * 2009-04-30 2010-11-18 Toshiba Corp Information processing apparatus
US9093844B2 (en) 2011-11-15 2015-07-28 Kabushiki Kaisha Toshiba Charge/discharge scheduling system and charge/discharge scheduling method
JP2013106476A (en) * 2011-11-15 2013-05-30 Toshiba Corp Charge and discharge planning system and charge and discharge planning method
CN103682498A (en) * 2013-12-04 2014-03-26 华为终端有限公司 Charging method and electronic device
JP2015133813A (en) * 2014-01-10 2015-07-23 株式会社デンソー Charger
JP2017108522A (en) * 2015-12-09 2017-06-15 本田技研工業株式会社 Charge current setting method, charging method, charger and actuator
CN106663957A (en) * 2016-03-01 2017-05-10 广东欧珀移动通信有限公司 Charging method, adapter, mobile terminal and charging system

Similar Documents

Publication Publication Date Title
US10267864B2 (en) Battery management system including apparatus for estimating battery state
US8237411B2 (en) Battery cell monitoring and balancing circuit
KR101786900B1 (en) Battery monitoring apparatus and battery monitoring method
US5321627A (en) Battery monitor and method for providing operating parameters
DE10231700B4 (en) Method for determining the aging state of a storage battery with regard to the removable amount of charge and monitoring device
US6362598B2 (en) Method for determining the state of charge and loading capacity of an electrical storage battery
KR100874727B1 (en) How to determine the state of charge of lithium ion batteries
US6577107B2 (en) Method of testing a lead battery for the purpose of charging it under optimal conditions
US9219377B2 (en) Battery charging apparatus and battery charging method
US6366054B1 (en) Method for determining state of charge of a battery by measuring its open circuit voltage
US8288995B2 (en) Assembled battery charging method and battery charging system
US6094033A (en) Battery state of charge detector with rapid charging capability and method
EP0994362B1 (en) Method for determining the load state and the high current bearing capacity of batteries
Kutluay et al. A new online state-of-charge estimation and monitoring system for sealed lead-acid batteries in telecommunication power supplies
DE10158029B4 (en) Method for calculating the dynamic state of charge in a battery
EP0711016B1 (en) Parameter measuring method, charge/discharge control method and apparatus and life predicting method for secondary batteries and power storage apparatus using the same
US6892148B2 (en) Circuit and method for measurement of battery capacity fade
CA1184599A (en) Method and apparatus for testing a battery
JP5393956B2 (en) Battery full charge capacity detection method
EP1877812B1 (en) Lithium sulfur rechargeable battery fuel gauge systems and methods
KR101414287B1 (en) Arithmetic processing apparatus for calculating internal resistance/open-circuit voltage of secondary battery
JP4962808B2 (en) Engine automatic control device and storage battery charge control device
US5631540A (en) Method and apparatus for predicting the remaining capacity and reserve time of a battery on discharge
DE60132951T2 (en) Detection method for detecting the internal state of a rechargeable battery, detection device for carrying out such a method and instrument with such a device
US8093866B2 (en) Method for managing charging of a rechargeable battery