JPH04194689A - Detecting device of residual capacity of battery - Google Patents

Abstract

PURPOSE:To enable accurate detection of a residual capacity with low power consumption by determining a full charge capacity calculated from the number of times of charging stored in a battery unit and from information on the intrinsic characteristics of a battery, and a consumed power calculated from a consumed power value for each processing of an apparatus. CONSTITUTION:A circuit 3 for changing the number of times of accumulation of a battery unit 1 reads out the number of times from a storage area of the number of times of charging at the time of an operation for accumulation, adds 1 to it and stores it again. A power consumption calculating means 8 of a central processing unit 7 determines in a detecting circuit 12 a consumed power at the moment obtained by an interrupt signal at each prescribed time from a timer 11, and integrates this and an average consumed power value of the apparatus stored in a state-classified consumed power value table 14, in a consumed power integration circuit 15, for each time interval. In a battery residual capacity calculating means 9, then, a full charge capacity is determined on the basis of the number of times of charging from a circuit 16 for reading out the number of times of charging and values of characteristics from a circuit 17 for reading out the characteristic values, and a residual capacity of a battery is determined on the basis of this full charge capacity and the consumed power determined by the means 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a battery remaining capacity detection device for detecting the remaining capacity of a storage battery used as a power source for various devices, and particularly relates to an improvement in remaining capacity detection accuracy. It is something.

[Prior Art] Detecting the remaining capacity of storage batteries used in various devices is important for operating the devices. In order to detect the remaining capacity of the storage battery, conventionally the power consumption is calculated based on the operating time of the device, and from the power consumption and the constant capacity when the storage battery is fully charged, it is calculated as ((full charge capacity - power consumption) / The remaining capacity is determined and displayed by calculating the full charge capacity.

[Problem to be solved by the invention]

Because storage batteries charge and discharge through chemical changes in materials,
When charging and discharging are repeated, the charging and discharging ability deteriorates due to consumption of materials, and as shown in FIG. 8, a storage battery that initially had a full charge capacity S decreases to Sn after being charged N times. This decreasing property varies depending on the type of battery, such as nickel-cadmium, lead, hydrogen, etc., but it is a characteristic specific to the battery, and batteries of the same type and type have the same characteristics.

However, conventionally, when detecting the remaining capacity of a storage battery, the initial full charge capacity S is used, so as shown in Figure 9, the remaining capacity after one hour of operation is , always (S-S (t))/S.

Therefore, after charging N times, there will be a difference between the actual remaining capacity (Sn-5n (t)l /Sn) after one hour of operation, and this difference will increase as the number of charging increases, making it difficult to accurately determine the remaining capacity. In order to overcome the disadvantage of not being able to obtain
The power consumption from the previous charge to the next charge is determined by integrating the value, and the remaining capacity is determined using this power consumption as the next full charge capacity. However, in this case, since the power source of the outflow current measuring device is the storage battery to be measured, there is a disadvantage that the outflow current measurement itself leads to battery consumption and is not efficient.

The present invention has been made in order to solve these shortcomings, and it is an object of the present invention to provide a battery remaining capacity detection device that can accurately detect remaining capacity with low power consumption.

[Means to solve the problem]

The remaining battery capacity detection device according to the present invention determines the processing status of a battery unit having a means for storing the number of times the storage battery has been charged and a means for storing characteristic information specific to the storage battery, and a device to which the battery unit is installed. , a power consumption calculation means that calculates the power consumption of the storage battery from pre-stored power consumption values for each process; and a power consumption calculation means that calculates the full charge capacity of the storage battery from the number of charging times of the storage battery and battery-specific characteristic information stored in the battery unit. The present invention is characterized by comprising a remaining battery capacity calculation means for calculating the remaining battery capacity from the calculated full charge capacity and the power consumption of the storage battery calculated by the power consumption calculation means.

[Effect]

In this invention, the processing status of the device to which the battery unit is attached is determined, and the power consumption of the storage battery is calculated from the power consumption value stored for each process. Calculate power consumption.

Further, by calculating the full charge capacity of the storage battery from the number of times the storage battery has been charged and characteristic information unique to the battery, the actual full charge capacity according to the number of times the battery has been charged is calculated.

The remaining capacity of the storage battery is calculated based on the calculated actual full charge capacity.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention. As shown in FIG. It has a storage area 4 for storing the number of charging times to be stored, and a characteristic value storage area 5 for storing characteristic information specific to the storage battery such as the equation of the characteristic curve of the storage battery 2 as shown in FIG. The charging number changing circuit 3 reads out the previous charging number stored in the charging number storage area 4 when charging the storage battery 2, and
Add "1" and store it in the charging number storage area 4.

This battery unit 1 is connected to a central processing unit 7 via an interface 6.

The central processing unit 7 has a power consumption calculation means 8, a remaining battery capacity calculation means 9, and a display means 10.

The power consumption calculation means 8 includes a timer 11 that generates an interrupt signal at regular intervals, a power consumption detection circuit 12 that calculates the power consumption at that moment based on the interrupt signal from the timer 11, and a battery unit 1 at that time. As shown in FIG. 2, the state determination circuit 13 determines the processing content of the device equipped with the device, and the average power consumption value when the device is performing each process, for example, during printing. is 200 mW, and a power consumption integration circuit 15 that integrates the power consumption determined by the power consumption detection circuit 12 for each time interval and calculates the total power consumption.
has.

The remaining battery capacity calculation means 9 includes a charging number reading circuit 16 that reads the number of photoelectric charges from the battery unit ↓, a characteristic value reading circuit 17 that reads the battery characteristic value from the battery unit 1, and a charging number reading circuit 17 that reads the battery characteristic value from the battery unit 1. A full charge capacity determination circuit 18 that calculates the battery capacity when the storage battery 2 is fully charged; a battery remaining capacity calculation circuit 19 that calculates the remaining battery capacity from the full charge capacity and the power consumption obtained by the power consumption calculation means 8; It has a display data creation circuit 20 that converts into display data for displaying the remaining battery capacity.

The operation of the remaining battery capacity detection device configured as above is as follows.
This will be explained with reference to the flowcharts of FIGS. 3, 4, and 5.

First, the battery unit 1 operates when connected to an external power source. During this operation, as shown in FIG. 3, the charging frequency changing circuit 3 always determines whether or not charging is in progress (step S1).
When not charging, the charging flag is turned off (step S2). When charging, the charging frequency changing circuit 3 checks whether the charging flag is on or not in step S3.
), charge count storage area 4 when the photoelectric mode flag is off.
The number of charging times of the storage battery 2 from the time to the number of songs is read out, and "1" is added to the value of the number of charging times that has been read out (step S4
．． S5). Thereafter, the added number of photoelectric charges is written in the charging number storage area 4 (step S6), and the charging flag is turned on to charge the storage battery 2 (step S7). This process is repeated while connected to the external power source and ends when the external power source is turned off (step S7).

In this way, the current number of charging times of the storage battery 2 is always stored in the charging number storage area 4 of the battery unit 1.

On the other hand, the power consumption calculation means 8 constantly integrates the power consumption of devices using the storage battery 2 as a power source.

As shown in FIG. 4, when the timer 11 issues an interrupt signal to (2) at regular intervals, for example every LOMS (step 511), the power consumption detection circuit 12 informs the state determination circuit 13 that the device is Ask them to determine what processing is being performed at that time. When the power consumption detection circuit 12 receives the information for internal processing determined by this request (step 5L2), the power consumption detection circuit 12 calculates the power consumption value according to the type of processing from the state-specific power consumption value table. The data is sent to the reading power consumption integration circuit 15 (step 513). The read power consumption value is the instantaneous value when the interrupt signal is sent, as shown in Figure 6.
It is assumed that the processing state continues for at least 10 m5 until the next interrupt signal, and the power consumption integration circuit 15 integrates every 10 m5 as shown in FIG.
14) The integration result of this power consumption value is added to the previous cumulative power consumption value (step 515).

This process is repeated while the device is in operation (step 816).
).

When the remaining battery capacity calculating means 9 calculates the remaining battery capacity of the storage battery 2, as shown in FIG. 521), the characteristic value reading circuit 17 reads the characteristic value of the storage battery 2 and sends it to the full charge capacity determining circuit 18 (step 522).

The full charge capacity determination circuit 18 determines the battery capacity when the storage battery 2 is fully charged at that point from the sent charging number and characteristic values, and sends the determined full charge capacity to the remaining battery capacity calculation circuit 19 (step 523 ).

When the remaining battery capacity calculation circuit 19 receives the full charge capacity,
The integrated value of the power consumption of the device at that time is taken in from the power consumption calculation means 8 (step 524). Then, from the integrated value of the full charge capacity and the power consumption at that time, (full charge capacity - integrated power consumption)/full charge capacity is calculated, and the remaining battery capacity is determined and sent to the display data creation circuit 20 (step 525).

The display data creation circuit 20 converts the sent battery remaining capacity data into display data and sends it to the display device 10 for display (step 526).

In the above embodiment, the interrupt cycle of the timer 11 was set to 10 m5, but by changing the interrupt cycle as appropriate depending on the operational status of the device, accurate power consumption values can be obtained and the remaining battery level can be adjusted. Capacity can be obtained with high precision.

〔Effect of the invention〕

As explained above, this invention determines the processing status of the equipment to which the 5-battery unit is attached, and calculates the power consumption of the storage battery from the power consumption value stored for each process, so it can be used as a power source for the equipment. It is possible to calculate the power consumption of a storage battery with low power consumption.

In addition, by calculating the full charge capacity of the storage battery from the number of times the storage battery has been charged and the characteristic information unique to the battery, the actual full charge capacity according to the number of charging times can be calculated, and the remaining capacity of the storage battery can be calculated based on the actual full charge capacity. Since it is calculated, the remaining capacity of the storage battery can be accurately calculated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the second invention, FIG. 2 is an explanatory diagram showing the contents of the state-specific consumption 'gravity value table of the above embodiment, and FIGS. 3, 4, and 5 respectively. 6 and 7 are explanatory diagrams showing the operation of calculating power consumption in the above embodiment, respectively. FIG. 8 is a characteristic diagram of the number of charging times and full charge capacity of the storage battery, and FIG. FIG. 9 is a characteristic diagram of the operating time of the storage battery and the remaining battery capacity. 1: Battery unit, 2: Storage battery, 3: Charging frequency changing circuit, 4: Charging frequency storage area, 5: Characteristic value storage area, 6
; Interface; 7; Central processing unit; 8; Power consumption calculation means; 9; Battery remaining capacity calculation means; 10; Display means; 11; Timer; 12; Power consumption detection circuit; 13; Status determination circuit; 14; Status Separate power consumption value table, 15; Power consumption integration circuit, 16; Charging number reading circuit, 17; Characteristic value reading circuit, 18; Full charge capacity determination circuit, 19; Battery remaining capacity calculation circuit, 20; Display data creation circuit .

Claims (1)

[Scope of Claims] A battery unit having means for storing the number of charging times of the storage battery and means for storing characteristic information unique to the storage battery, and a method for determining the processing state of a device to which the battery unit is attached, and storing information stored in advance. A power consumption calculation means that calculates the power consumption of the storage battery from the power consumption value for each process, and a fully charged capacity of the storage battery is calculated from the number of charging times of the storage battery and battery-specific characteristic information stored in the battery unit. A battery remaining capacity detection device comprising: a battery remaining capacity calculation means for calculating a battery remaining capacity from a full charge capacity and a power consumption of a storage battery calculated by a power consumption calculation means.