JPH07203634A - Charger for secondary cell - Google Patents

Abstract

PURPOSE:To prevent variations in characteristics from one secondary cell to another by charging a plurality of the secondary cells by time-division system. CONSTITUTION:A microcomputer control unit 8 learns through voltage monitoring input that secondary cells C are placed between the terminals 4, 5 of a mounting section. The control unit equally divides a unit time T by the number of the secondary cells. It then controls a d.c. constant voltage control unit 1 through output control and controls switches 6a-6b through time- division switch control output so that charging current will sequentially pass between the corresponding ones of the terminals 4, 5 for each divided time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable rechargeable battery cell charging device such as nickel-cadmium, nickel-hydrogen, lithium-ion battery, etc., particularly when a plurality of rechargeable battery cells are used simultaneously. The present invention relates to a secondary battery cell charging device that can maintain the characteristics of each secondary battery cell constant.

[0002]

2. Description of the Related Art Portable terminal radios that are powered by commercially available batteries (such as portable cellular phones and low-power portable transceivers)
For batteries and battery-operated OA terminal devices, use primary battery cells such as manganese, mercury, and alkaline batteries, or rechargeable secondary battery cells such as nickel-cadmium, nickel-hydrogen, and lithium-ion batteries. be able to. The primary battery cells are discharged and then thrown away and replaced with new ones, but the secondary battery cells can be recharged and used. However, if a plurality of secondary battery cells are loaded to obtain a predetermined voltage, it is not easy to maintain the uniformity due to variations in the characteristics of the secondary battery cells and the number of times (life) of charge / discharge can be repeated. Therefore, the secondary battery cell is not suitable as an open assembled battery for a battery cassette in which individual battery cells can be replaced at any time, and the primary battery cell has been used.

In order to obtain a required power supply voltage by combining a plurality of secondary battery cells, a secondary battery cell having uniform characteristics is preliminarily wired in a factory to construct an assembled battery. , "Battery pack" that is hermetically mounted in a battery case shaped according to the style of each device used
Was manufactured and sold as

[0004]

In such a battery pack, since rechargeable battery cells having uniform characteristics can be collectively charged into an assembled battery, the labor of managing the state of each battery cell can be saved, but the assembled battery can be saved. If even one single secondary battery cell deteriorates in characteristics without waiting for a specified life and the balance of characteristics as an assembled battery is lost, the expensive battery pack must be replaced in its entirety, which is extremely uneconomical. It was a waste of resources.

Therefore, an object of the present invention is to provide a rechargeable battery in an open assembled battery system in which each rechargeable battery cell can be individually and arbitrarily loaded by charging while maintaining the characteristics of each rechargeable battery cell constant. Allows to use cells,
Therefore, it is an object of the present invention to provide a rechargeable battery cell charging device capable of improving uneconomical efficiency and effective utilization of resources.

[0006]

In order to achieve the above object, the invention as set forth in claim 1 is capable of mounting a plurality of secondary battery cells in respective fixed directions, and each of the mounted secondary battery cells is Mounting means having a plurality of sets of terminals that are in contact with both electrodes, power supply means for outputting a charging current, which is a constant-voltage direct current in the charging direction, to each pair of terminals of the mounting means, and for each set of terminals Switching means for respectively switching the charging current, voltage value measuring means for measuring the voltage value in the discharge direction between each pair of terminals, and a predetermined unit time, the voltage is measured and measured by the voltage value measuring means. The power supply means and each switching means are divided evenly by the number of pairs of terminals whose generated voltage values are equal to or less than a certain value, and a charging current flows through each pair of terminals in sequence at each divided time. control That to constitute a charging apparatus of the secondary battery cells and a control unit.

According to a second aspect of the invention, in the control means, the voltage value in the discharge direction measured by the voltage value measuring means exceeds the predetermined value which is a predetermined full charge value of the secondary battery cell, And controlling each of the switching means so that the charging current flows through the set of terminals that is less than a predetermined 100% charge value so that an appropriate amount of current is supplied as the supplementary charging current for a time shorter than the divided time. Thus, the rechargeable battery cell charging device according to claim 1 is configured.

According to a third aspect of the present invention, there is provided discharge load means connected to the set of each terminal through the switching means and the discharge load connection switching means, and a predetermined complete discharge voltage value is obtained. Until reaching, the control means controls the power supply means, the discharge load connection switching means, and the switching means so that the discharge current sequentially flows from each of the pairs of terminals and the charge current does not flow from the power supply means. The secondary battery cell charging device according to claim 2 is provided with a discharging circuit.

According to a fourth aspect of the present invention, the control means performs a one-time charging mode in which the charging process and the auxiliary charging process are sequentially performed only once, and a discharging process in which the charging process, the auxiliary charging process, and the discharging process are sequentially repeated. The mode is selectable, and the rechargeable battery cell charging device according to claim 3 is configured to control each means according to the selected mode.

According to a fifth aspect of the invention, the rechargeable battery cell charging apparatus according to the fourth aspect is configured such that the mode selection is performed by manual switching.

According to a sixth aspect of the present invention, the control means evenly divides the predetermined unit time by the number of pairs of terminals in which the voltage in the discharge direction is detected by the voltage value measuring means,
The power supply unit, the discharge load connection switching unit, and the switching unit are controlled so that a discharge current flows in sequence from each set of terminals for each divided time, and the charging process and the auxiliary charging process are set to one. 4. A one-time charge mode that is sequentially performed only once, and a discharge mode that sequentially repeats a charging process, a supplementary charging process, and a discharging process can be selected, and each means is controlled according to the selected mode. A rechargeable battery cell charging device was constructed.

The invention according to claim 7 is provided with an abnormality detecting means for detecting an abnormality in each of the secondary battery cells attached to the set of terminals, and the charging device for the secondary battery cell according to claim 6. Configured.

According to the eighth aspect of the present invention, the abnormality detecting means is a ratio of cumulative operating time required for charging / discharging voltage change of a certain width between charging and discharging for each set of the terminals. 8. The measured charging / discharging time ratio is calculated and compared with a predetermined standard charging / discharging characteristic, and if there is a certain error or more, the secondary battery cell attached to the set of terminals is judged to be abnormal. The rechargeable battery cell charging device described in 1. was constructed.

According to a ninth aspect of the present invention, the abnormality detecting means includes a change in the actually measured voltage value measured by the voltage measuring means for measuring a discharge voltage value between the pairs of terminals, and a predetermined standard. The secondary battery cell according to claim 7, wherein the secondary battery cell attached to the set of terminals is judged to be abnormal when the voltage value change is compared with a predetermined range. Configured the charging device.

According to a tenth aspect of the present invention, the abnormality detecting means is respectively measured by a plurality of temperature measuring means for measuring the surface temperature of each secondary battery cell in which an electrode contacts the set of each terminal. 8. The secondary battery according to claim 7, wherein the measured temperature is compared with a predetermined standard temperature, and if there is a certain error or more, the secondary battery cell attached to the set of terminals is determined to be abnormal. A battery cell charging device was constructed.

According to an eleventh aspect of the present invention, in the discharge mode, if no abnormality is detected by the abnormality detecting means in each of the charging process, the supplementary charging process and the discharging process, after the discharging process is completed, the set of the terminals is assembled. When the abnormality is detected again in the charging mode once, and the abnormality is detected again in the charging process, the supplementary charging process, and the discharging process for the second time, the corresponding warning means of the respective terminal groups is applicable. The rechargeable battery cell charging device according to claim 7 is configured such that the operation of the secondary battery cell is interrupted while the one of the terminals is operated.

According to a twelfth aspect of the present invention, the rechargeable battery cell charging device according to the third aspect is configured such that at least a part of the discharging load means is a light emitting diode connected in a forward direction. did.

[0018]

Since the present invention has the above-mentioned structure, it has the following effects.

In the rechargeable battery cell charging device according to the first aspect of the present invention, by mounting a plurality of rechargeable battery cells to be charged on the mounting means, both electrodes of each rechargeable battery cell are attached. The sets of terminals come into contact with each other, and the voltage value measuring means detects the voltage in the discharge direction. This makes it possible to know which set of terminals the secondary battery cell is attached to. The control means evenly divides the predetermined unit time by the number (1 or more) of terminal pairs in which the voltage is detected and the measured voltage value is equal to or less than a certain value (that is, charging is required), By controlling the power supply means that outputs a charging current that is a constant voltage direct current in the charging direction and the switching means that switches the charging current for each set of terminals, and for each set of corresponding terminals, for each divided time. The charging current is made to flow in sequence one by one. When the charging of the secondary battery cell progresses and the voltage value measured by the voltage value measuring means exceeds a certain value, it is determined that the secondary battery cell attached to the set of terminals is sufficiently charged, and Supply of charging current to the set is stopped.
In this case, the number of terminal sets is reduced by one, and time sharing is performed again to continue supplying the charging current to the other terminal sets. This is continued until the voltage value exceeds a constant value for all the pairs of terminals to which the charging current is initially applied.

In the rechargeable battery cell charging device according to the second aspect of the present invention, the constant voltage value in the discharging direction is:
It is set to a predetermined full charge value of the secondary battery cell. Supplementary charging is performed for the set of terminals that exceed the full charge value.
The supplementary charging is performed by controlling the switching means so that the supplementary charging current has an appropriate amount of current so that the supplemental charging current flows for a shorter time than the time obtained by dividing the unit time. The supplementary charge is continued until the voltage value becomes equal to or higher than a predetermined 100% charge value. The full charge value and the 100% charge value can be set in advance for each type of secondary battery cell.

A charging device for a secondary battery cell according to a third aspect of the present invention is provided with a discharging circuit having a discharging load means. The discharging load means is connected to each set of terminals via the switching means and the discharging load connection switching means. The control means controls the power supply means, the switching means, and the discharge load connection switching means, and in the discharging process in which each terminal and the discharge load are connected by the discharge load connection switching means, no charging current flows from the power supply means. Thus, the output of the power supply means is stopped. The discharge is continued until the voltage value reaches the predetermined complete discharge voltage value, and the discharge is stopped for the set of terminals that has reached the predetermined complete discharge voltage value. The complete discharge voltage value can be set in advance for each type of secondary battery cell.

In the rechargeable battery cell charging device according to the fourth aspect of the present invention, the control means can select a one-time charging mode and a discharging mode. In the one-time charging mode, the charging process and the auxiliary charging are performed. The process is performed only once in sequence, and each means is controlled so that the charging process, the supplementary charging process, and the discharging process are sequentially repeated in the discharge mode.

In the rechargeable battery cell charging device according to the fifth aspect of the present invention, mode selection is performed by manual switching.

In the rechargeable battery cell charging apparatus according to the sixth aspect of the present invention, the discharging is performed in a predetermined unit time by the number of terminal sets in which the voltage in the discharging direction is detected by the voltage value measuring means. It is carried out by controlling the switching means so that the discharge current flows through the terminals evenly and one group at a time for each of the terminals. The discharge is
It continues until the voltage value reaches the predetermined full discharge voltage value,
Discharging is stopped for a set of terminals that has reached a predetermined complete discharge voltage value, the number of set of terminals is reduced by one, and time division is performed again to continue discharging for another set of terminals. Also,
The control means can select one-time charge mode and discharge mode. In the one-time charge mode, the charging process and the auxiliary charging process are performed only once in sequence, and in the discharging mode, the charging process, the auxiliary charging process, and the discharging process. Each means is controlled so that and are repeated in order.

In the rechargeable battery cell charging apparatus according to the seventh aspect of the invention, the abnormality detecting means detects an abnormality in each of the secondary battery cells attached to the set of terminals.

In the rechargeable battery cell charging device according to the present invention as defined in claim 8, the abnormality detecting means changes the charging / discharging voltage within a certain range between charging and discharging for each set of terminals. A measured charge / discharge time ratio, which is the ratio of the cumulative operating time required, is obtained and compared with a predetermined standard charge / discharge characteristic. When there is a certain error or more, the secondary battery cell attached to the set of terminals is determined to be abnormal. The standard charge / discharge characteristics can be set in advance for each type of secondary battery cell.

In the rechargeable battery cell charging device according to the present invention as defined in claim 9, the abnormality detecting means is an actual measurement measured by the voltage measuring means for measuring a discharge voltage value between each set of terminals. The voltage value change is compared with a predetermined standard voltage value change. If it is outside the specified range,
The secondary battery cell attached to the set of terminals is determined to be abnormal. The standard voltage value change can be set in advance for each type of secondary battery cell.

In the rechargeable battery cell charging device according to the tenth aspect of the present invention, the abnormality detection means means is provided with a plurality of means for measuring the surface temperature of each rechargeable battery cell whose electrode contacts the set of terminals. The actual temperature measured by each of the temperature measuring means and the predetermined standard temperature are compared. When there is a certain error or more, the secondary battery cell attached to the set of terminals is determined to be abnormal. The standard temperature can be set in advance for each type of secondary battery cell.

In the rechargeable battery cell charging device according to the eleventh aspect of the present invention, in the discharging mode, the abnormality detecting means must detect an abnormality in each of the charging process, the supplementary charging process and the discharging process. For example, after the discharging process is completed, the set of terminals is switched to the charging mode once, and the charging is completed through the charging process and the supplementary charging process. When an abnormality is detected, the process of charging, supplementary charging and discharging is repeated for the set of terminals in the discharging mode. And 2
If the abnormality is detected again during the charge process, the supplementary charge process, and the discharge process for the second time, it is determined that the secondary battery cell attached to the set of terminals has an abnormality that is difficult to cure, and the Appropriate ones of the warning means attached to each group are activated, and the work for the group of terminals is interrupted.

In the rechargeable battery cell charging apparatus according to the twelfth aspect of the present invention, at least a part of the discharging load means is a light emitting diode connected in the forward direction, so that the load current is not heat but light. To be converted. In addition, backflow can be prevented.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below.

FIG. 1 is a block diagram showing the configuration of an embodiment of a rechargeable battery cell charging apparatus according to the present invention.

In the figure, a charging current, which is a constant-voltage DC current, is supplied from the DC constant-voltage control unit 1. The charging device of this embodiment can obtain electric power from the power supply of the automobile and the commercial AC power supply, and when the vehicle is mounted, +12 from the battery.
Directly convert the charging current from the DC power supply of V to + 24V. When a commercial AC power supply is used, the AC rectification unit 2 converts the AC 100V obtained from the plug into a DC and then converts it into a charging current to generate a stabilized voltage.

The DC constant voltage control unit 1 is connected to a plurality of terminals 4 of the mounting unit 3 in which a plurality of secondary battery cells are mounted, and each terminal 4 is connected to each secondary battery cell C mounted in the mounting unit 3. The positive electrodes are in contact with each other, and the negative electrodes of the secondary battery cells C are in contact with the terminals 5, respectively. A diode D for commutation is connected in parallel between each terminal 4 and the DC constant voltage control unit 1 in order to prevent current from flowing backward from the secondary battery cell C to the DC constant voltage control unit 1. A switch 6 is connected to each terminal 5 and is grounded. Terminal 4,
5, the switches 6 and the like are provided in the same number as each of the secondary battery cells C that can be mounted on the mounting portion 3, but in the figure, four of them are shown.

A discharge load connection switching section 7 is connected between the diode D and the terminal 4. The discharge load connection switching unit 7 performs simultaneous load disconnection control for collectively outputting the inputs from the terminals 4. On the output side of the discharge load connection switching unit 7, a discharge load is provided in which a plurality of pairs of forward LEDs and protection resistors R connected in series with the LEDs are connected in parallel. Only two sets are shown in the figure. This forward LED prevents Joule heat from being generated when a normal resistor is used for a load and adversely affects the thermistor T and other devices described later, and the forward voltage of the LED (usually 1.1). ~ 1.4 V), the forward current characteristic (10 to 50 mA) depending on the electrode voltage of each secondary battery cell is obtained as a load current, and the electrode voltage of the secondary battery cell is 1.0 V. The purpose of the overload discharge below is to limit (load current interruption) by utilizing its forward current characteristic.

A thermistor T for measuring the surface temperature of each secondary battery cell C mounted between the terminals 4 and 5 is attached to the mounting portion 3. A warning lamp P, which is a light emitting diode, is attached to each secondary battery cell C. Each warning lamp P is attached so as to identify each secondary battery cell C, and is not limited to one provided in close proximity to each other, for example, for each secondary battery cell C in an external cabinet. In some cases, it may be exposed adjacent to the displayed number.

The microcomputer control unit 8 receives the surface temperature detection sensor input from each thermistor T, and receives the voltage monitoring input from the line connected between the terminal 4 and the diode D between the groups of the terminals 4 and 5. Of the DC constant voltage control unit 1 by output control, the switch 6 by the time-division switch control output, the discharge load connection switching unit 7 by the load switching control output, and the warning lamp control output. Controls each operation of the warning lamp P. The microcomputer control unit 8 stores a predetermined voltage value or standard value in advance,
A RAM 9 for storing data of each secondary battery cell to be charged is connected. Each data for each secondary battery cell is stored in the RAM 9 until the secondary battery cell is removed from the mounting portion 3. The microcomputer control unit 8
Comes with a mode switch (not shown).

Next, the operation of the charging device of this embodiment will be described with reference to the flowcharts of FIG.

As shown in the main chart of FIG. 2, when charging (step 1) and auxiliary charging (step 2) are completed,
Depending on the mode discrimination (step 3), the process proceeds to one of time division discharge (step 4), discharge (step 5), and end.

Of these, in the fixed mode, the processes of charging, supplementary charging and normal discharging are repeated several times. In normal discharge, each switch 6 connected to the terminal 5 in which the secondary battery cell is mounted is continuously closed, and when the discharge reaches the full discharge voltage, charging and supplementary charging are repeated. By repeating the operation twice, the break-in of a new rechargeable battery cell and the memory effect are reduced.

In the one-time charge mode, the discharged secondary battery cells are only charged and supplemented, but not discharged. This is the mode selected when charging a secondary battery cell with normal performance.

The automatic mode is a mode selected to match the characteristic balance of a plurality of secondary battery cells. Hereinafter, the charging process, the auxiliary charging process, and the time-division discharging process will be described in this order with reference to FIGS.

In the charging process, first, the secondary battery cell to be charged is mounted on the mounting portion 3, and both electrodes of the secondary battery cell and the terminals 4 and 5 are brought into contact with each other. Is the voltage monitoring input. Microcomputer control unit 8
Determines that the secondary battery cell that needs to be charged is attached to the set of terminals in which the voltage in the discharge direction is detected and the measured voltage value is equal to or less than the predetermined full charge value Vf (step 11). ). The full charge value Vf is stored in the RAM 9 in advance. If the voltage value is abnormal (for example, if the direction is different or extremely high), the terminal 4,
No charging current is supplied to the group of 5.

Next, the predetermined unit time T is evenly divided by the number n of sets of terminals 4 and 5 to which the secondary battery cells requiring charging are mounted, and the divided time t1 is obtained (step 12).
The unit time T is, for example, 1 second, and if n is 4, t1 is 0.25 seconds. If n is 3, t1 will be 0.33 seconds. If only one secondary battery is attached, t1 is 1 second.

When t1 is obtained, charging is started (step 13). In the present embodiment, unlike the sequential charging method in which one of the secondary battery cells is charged and then the next secondary battery cell is charged, a case where a plurality of secondary battery cells are mounted , The charge / discharge is performed in a time-sharing manner in units of secondary battery cells.

This will be described with reference to FIG. Figure 6 (a)
(B) is a diagram showing a time division timing at the time of charging. FIG. 6A shows a case where three rechargeable battery cells are mounted.
(B) is a case where four pieces are mounted. When three pieces are attached, the unit time T of 1 second is divided into three, and CH1 = 0.
During the 33 seconds, the first secondary battery cell C1 is charged. That is, only the switch 6a connected to the attached terminal 5 of the secondary battery cell C1 is closed and the other switches 6 are opened for 0.33 seconds. After 0.33 seconds have passed, the switch 6a opens, and during CH2 = 0.33 seconds, 2
Only the switch 6b connected to the mounted terminal 5 of the secondary battery cell C2 is closed, and then only the switch 6c is closed. This process is repeated.

The same applies to the case where four switches shown in FIG. 6B are mounted, and each switch 6a to 6d has CH5 = CH6 = CH7 = C.
During H8 = 0.25 seconds, the batteries are sequentially opened to charge in a time-sharing manner. Due to such time-divisional charging, a plurality of secondary battery cells are charged under almost the same conditions, unlike the sequential charging method, so that variations in characteristics are unlikely to occur.

Even during charging, the microcomputer controller 8 constantly monitors the voltage, and charging is continued until the voltage value in the discharging direction between the terminals 4 and 5 exceeds the full charge value Vf. (Step 14).

During charging, the microcomputer control unit 8 monitors the rate of change of the voltage value between the terminals 4 and 5, and the temperature rise rate of each secondary battery cell C by the thermistor T.
If the standard change rate or the temperature rise rate stored in No. 9 is exceeded, it is determined to be abnormal (step 15) and the charging is interrupted. Furthermore, in the process of charging, the microcomputer control unit 8 calculates the cumulative charging time for each set of terminals 4 and 5,
It is stored in the RAM 9.

When the voltage value in the discharging direction between the terminals 4 and 5 exceeds the full charge value Vf, the auxiliary charging process as shown in FIG. The auxiliary charging corresponds to the microcomputer control unit 8 so that the charging current from the DC constant voltage control unit 1 flows for a time shorter than the time divided in step 2 so that an appropriate amount of current is obtained as the auxiliary charging current. Switch 6 consisting of a set of terminals 4 and 5
Control is performed.

First, by the voltage discrimination, the auxiliary charging is performed only for the voltage values of the terminals 4 and 5 exceeding the full charge value Vf (step 21). As in the charging process, when the voltage value is abnormal, supplementary charging is not performed.

Next, the auxiliary charging time t2 is calculated (step 22). As shown in FIG. 6C, it is assumed that, out of the four secondary battery cells C1 to C4, the secondary battery cells C2 and C4 have moved to the auxiliary charging process. Other secondary battery cells C1, C
3 continues to CH9 = CH11 = CH5 = 0.25
Charging for seconds.

The occupation time in the auxiliary charging process can be obtained as follows. The auxiliary charging current capacity IL is, for example, IL
= Ic × 0.02. Here, Ic is the secondary battery cell nominal capacity, and 0.02 is an appropriate value as the auxiliary charging current. If the output current capacity from the DC constant voltage control unit 1 is Io, IL = Io × (T / t
It is expressed by the relationship of 2). Here, t2 is a supplementary charging time, and charging time t1 = T × 1 / n means t2 = t1 × 1 /
There is a relationship of m. Here, m is a supplementary charge division ratio set to satisfy IL = Ic × 0.02, and is 1 or more. Therefore, t1 ≧ t2.

For example, assuming that the output current capacity Io from the DC constant voltage control unit 1 is 800 mC (C: capacity), and the secondary battery cell nominal capacity Ic = 800 mA / h and n = 4,
Since IL is 16 mA, t2 is 16 ÷ 800 = 1
/ 50 = 2 msec. Furthermore, the supplementary charge division ratio m
Becomes t1 / t2 = 12.5. That is, the occupation time in the supplementary charging process is calculated by dividing the charging time t1 by the supplementary charging division ratio m.
It can be seen that division is performed at = 12.5, which is 2 msec. In this way, by varying the auxiliary charging division ratio m, it is possible to supply a predetermined integrated current value per unit time T. By performing time-division supplementary charging in this way, unlike the sequential method, variations in characteristics are less likely to occur even when a plurality of secondary battery cells are charged.

The time CH10 = obtained in this way
Only for CH12, the switches 6b and 6d are controlled so that the charging current is passed through the secondary battery cells C2 and C4, and the microcomputer control unit 8 constantly monitors the voltage during this time as well.
Supplementary charging is continued until the 100% charge value Vh stored in AM9 is reached (step 24).

During the supplementary charging, if an abnormality is detected in the surface temperature, voltage, time required for charging or supplementary charging of the secondary battery cell (step 25), the work relating to the secondary battery cell is interrupted. It

In the automatic mode, when the auxiliary charging process is completed, the discharge process is started. The discharging process is performed after charging or supplementary charging of all the mounted secondary battery cells is completed or interrupted.

In the discharging process, as in the case of charging, the unit time T is equally divided by the number l of the corresponding terminals to obtain the discharge occupation time t3 (step 41) and discharging is performed (step 42). With this, unlike the sequential discharge method, it is possible to perform discharge in which variations in characteristics are unlikely to occur.

The discharge is continued until the discharge voltage becomes equal to or lower than the complete discharge voltage value Ve (step 43). During the discharge, the rate of voltage change and the rate of temperature rise are monitored as in the case of charging.
The charge / discharge time ratio is investigated to detect an abnormality (step 44). The charge / discharge time ratio is the time of charging and the time of discharging,
It is the ratio of the cumulative operating time until the voltage value between the terminals 4 and 5 of each secondary battery cell changes within a certain range, and the measured charge / discharge time ratio is constant between the standard charge / discharge characteristics. The above errors are compared for any error. This test best reflects the characteristics of the secondary battery cell.

When the discharge voltage becomes equal to or lower than the complete discharge voltage value Ve without detecting an abnormality, the mode is switched (step 45), and the charging process and the auxiliary charging process are performed again,
Charging of the secondary battery cell is completed normally.

If an abnormality is detected, the microcomputer control unit 8 uses the RAM 9 to store data regarding the secondary battery cell (including abnormality detection in the charging process and the auxiliary charging process).
Is read out, and it is judged whether or not an abnormality has been detected in the previous charging process, auxiliary charging process, and discharging process, and the detection of the current abnormality is the second time (step 45). Accordingly, in this embodiment, it is not immediately determined that the secondary battery cell is abnormal due to the first abnormality detection, and if the abnormality is cured through the discharging process, the charging process, and the supplementary charging process, this is corrected. As normal, the mode is switched in step 45, and the battery can be charged and used. Further, even if the battery is not abnormal, it is possible to avoid that a battery that has not been charged as a voltage abnormality in the first charging process, such as a new secondary battery cell, is determined to be abnormal.

When the abnormality is detected for the second time, the microcomputer controller 8 outputs a warning lamp control output, and the corresponding terminal 4,
By turning on the warning lamp P attached to the group of 5 (step 46), the user can be prompted to discard or replace the secondary battery cell attached to the group of the terminal, and it is possible to prevent mixed use. .

The embodiments of the present invention have been described above.
It is needless to say that the present invention is not limited to the above-mentioned embodiments and can be appropriately modified within the scope of the gist of the present invention.

[0064]

According to the rechargeable battery cell charging apparatus of the first aspect of the invention, charging is performed in sequence for each divided time, and a plurality of rechargeable battery cells are charged. , Since the charging is performed in almost the same steps, variations in characteristics are unlikely to occur even when the charging is stopped midway.

According to the rechargeable battery cell charging device of the second aspect of the invention, since the auxiliary charging is performed in sequence one by one, even if a plurality of secondary battery cells are auxiliary charged, Even if the auxiliary charging is stopped in the middle of the process, variations in characteristics are unlikely to occur.

Since the secondary battery cell charging device according to the third aspect of the present invention is provided with the discharging circuit, charging,
By repeating supplemental charging and discharging, it is possible to make the new secondary battery cell accustomed and reduce the memory effect.

In the rechargeable battery cell charging device according to the fourth aspect of the present invention, the normal rechargeable battery cell is normally charged in the one-time charge mode, and the rechargeable battery cell is new or has a memory effect. Can be charged with the discharge mode.

In the rechargeable battery cell charging device according to the fifth aspect of the invention, the mode can be selected by manual switching depending on the rechargeable battery cell.

According to the rechargeable battery cell charging device of the sixth aspect of the present invention, the discharge is performed once every divided time.
Since the steps are sequentially performed one by one, variations in characteristics are unlikely to occur even when the discharge of a plurality of secondary battery cells is stopped midway.

According to the rechargeable battery cell charging device of the seventh aspect of the present invention, each of the two batteries attached to the set of terminals is
The abnormality of the secondary battery cell can be detected by the abnormality detecting means.

According to the rechargeable battery cell charging device of the eighth aspect of the present invention, the abnormality can be detected by the measured charge / discharge time ratio representing the characteristics of the secondary battery cell.

According to the rechargeable battery cell charging device of the ninth aspect of the present invention, the abnormality can be detected by the change in the measured voltage value representing the characteristics of the rechargeable battery cell.

According to the rechargeable battery cell charging device of the tenth aspect of the present invention, each of the two values representing the characteristics of the rechargeable battery cell is
Abnormality can be detected by the surface temperature of the secondary battery cell.

According to the rechargeable battery cell charging device of the eleventh aspect of the present invention, it is not determined that the abnormality is detected once the abnormality is detected, but the abnormality is detected for the first time when the abnormality is detected a second time.
Since the warning is issued, the abnormality will not be healed or the normal one will not be abnormal.

According to the rechargeable battery cell charging device of the twelfth aspect of the invention, the Joule heat can be suppressed by using the light emitting diode as the load resistance at the time of discharging, and it is possible to use the other device. There is no adverse effect from heat.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a configuration of an embodiment of a rechargeable battery cell charging device according to the present invention.

FIG. 2 is a main flow showing an operation of the embodiment shown in FIG.

FIG. 3 is a flowchart showing a charging process routine in the main flow of FIG.

FIG. 4 is a flowchart showing a supplementary charging process routine in the main flow of FIG.

FIG. 5 is a flowchart showing a discharge process routine in the main flow of FIG.

6 (a), (b) and (c) are diagrams showing time division timings.

[Explanation of symbols]

 1 DC constant voltage control unit 3 Mounting unit 4, 5 terminals 6 Switch 8 Microcomputer control unit

Claims (12)

[Claims] 1. A mounting means, wherein a plurality of secondary battery cells can be mounted in a fixed direction, respectively, and a mounting means having a set of a plurality of terminals that come into contact with both electrodes of each mounted secondary battery cell; A power supply unit that outputs a charging current that is a constant voltage direct current in the charging direction to each terminal group, a switching unit that switches the charging current for each terminal group, and a discharging direction between each terminal group. The voltage value measuring means for measuring the voltage value of and the predetermined unit time are evenly divided by the number of pairs of terminals in which the voltage value is detected by the voltage value measuring means and the measured voltage value is a certain value or less. A charging device for a secondary battery cell, comprising: a power supply means and a control means for controlling each switching means so that a charging current flows in sequence to each set of the terminals at each divided time. 2. The control means, wherein the voltage value in the discharging direction measured by the voltage value measuring means exceeds the predetermined value which is a predetermined full charge value of the secondary battery cell, and a predetermined 100
2. The switching means is controlled so that a charging current flows through the set of terminals having a charging rate less than a% charging value for a suitable amount of auxiliary charging current for a time shorter than the divided time. The rechargeable battery cell charging device described in 1. 3. A discharge load means connected to the set of each terminal through the switching means and a discharge load connection switching means, and until a predetermined complete discharge voltage value is reached.
A discharge circuit in which the power supply means, the discharge load connection switching means, and the switching means are controlled by the control means so that the discharge current sequentially flows from each of the sets of terminals and the charge current does not flow from the power supply means. The rechargeable battery cell charging device according to claim 2, further comprising: 4. The control means can select one-time charging mode in which the charging process and the auxiliary charging process are sequentially performed only once, and a discharging mode in which the charging process, the auxiliary charging process, and the discharging process are sequentially repeated. The rechargeable battery cell charging device according to claim 3, wherein each unit is controlled according to the selected mode. 5. The rechargeable battery cell charging device according to claim 4, wherein the selection of the mode is performed by manual switching. 6. The control unit divides a predetermined unit time evenly by the number of terminal sets in which a voltage in the discharge direction is detected by the voltage value measuring unit, and the divided time from each of the terminal sets. A one-time charge mode in which the power source means, the discharge load connection switching means, and the switching means are controlled so that a discharge current flows in sequence for each set, and the charging process and the auxiliary charging process are performed only once in sequence. The charging device for a secondary battery cell according to claim 3, wherein a discharging mode in which a charging process, a supplementary charging process, and a discharging process are sequentially repeated can be selected, and each means is controlled according to the selected mode. 7. The rechargeable battery cell charging device according to claim 6, further comprising an abnormality detecting unit that detects an abnormality in each of the secondary battery cells attached to the set of terminals. 8. The abnormality detecting means obtains a measured charge / discharge time ratio, which is a ratio of cumulative operating time required for a change in charge / discharge voltage with a constant width between charging and discharging, for each set of the terminals. The rechargeable battery cell according to claim 7, wherein the rechargeable battery cell attached to the set of terminals is judged to be abnormal when there is a certain error or more compared with a predetermined standard charge / discharge characteristic. apparatus. 9. The abnormality detecting means compares the actually measured voltage value change measured by the voltage measuring means for measuring the discharge voltage value between the pairs of terminals with a predetermined standard voltage value change. The rechargeable battery cell charging device according to claim 7, wherein the rechargeable battery cell attached to the set of terminals is determined to be abnormal if the battery is out of a predetermined range. 10. The anomaly detecting means is a measured temperature and a predetermined standard measured by a plurality of temperature measuring means for measuring the surface temperature of each secondary battery cell whose electrode is in contact with the set of each terminal. The rechargeable battery cell charging device according to claim 7, wherein the temperature of the rechargeable battery cell is judged to be abnormal when the temperature of the rechargeable battery cell is compared with the temperature and there is a certain error or more. 11. In the discharging mode, if no abnormality is detected by the abnormality detecting means in each of the charging process, the supplementary charging process and the discharging process, after the discharging process is completed, the terminal set is set to the once charging mode. If the abnormality is detected again during the second charging process, the auxiliary charging process, and the discharging process, the corresponding alarming means attached to each of the terminal groups is activated, and The rechargeable battery cell charging device according to claim 7, wherein the work is suspended for the set of terminals. 12. The light emitting diode connected in a forward direction, at least a part of the discharging load means.
The rechargeable battery cell charging device described in 1.