JP2001174532A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a working process and shorten a measuring time on diagnosis, and to detect capacity deterioration of a secondary battery without delay, by executing capacity deterioration diagnosis by using a portable instrument. SOLUTION: An internal resistance measuring circuit 3d sends an alternating current or a direct current through an upper part node of a protection circuit 1b and a negative electrode side node of the secondary battery 1a, and simultaneously measures the change of a voltage developed across the secondary battery 1a between a node between the protection circuit 1b and the secondary battery 1a and the negative electrode side node of the secondary battery 1a, and divides the measured value of the change of the voltage developed across the secondary battery 1a by the value of the alternating current or the direct current, to thereby determine the internal resistance R of the secondary battery 1a. The internal resistance is increased following capacity deterioration in the secondary battery. Therefore, the internal resistance determination circuit 3e determines as the capacity deterioration of the secondary battery, when the internal resistance of the secondary battery 1a exceeds a prescribed internal resistance value, and displays it on a display part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device having a built-in device for diagnosing capacity deterioration of a secondary battery such as a nickel hydrogen battery or a lithium ion secondary battery.

[0002]

2. Description of the Related Art Conventionally, a portable telephone or a portable information terminal device has a built-in battery for supplying power to a main body.
As this battery, a secondary battery such as a rechargeable nickel-metal hydride battery or a lithium ion battery is used. In particular, a lightweight lithium ion secondary battery having a high energy density is widely used. By the way, it is generally known that in the above-mentioned secondary battery, a capacity deterioration occurs in which the battery capacity is reduced every time a cycle of charging and discharging is repeated. In a mobile phone, each time charging and talking (discharging) are repeated, the talking time (discharging time) is shortened. By repeating this charging and talking cycle many times, a talking time of a predetermined performance can be secured. It happens that it is gone. In order to eliminate such a situation, it is necessary to know the state of the battery.

For example, as a method for quantitatively measuring the state of capacity deterioration of a battery pack, a method using a discharge capacity tester using an external discharger (discharge capacity test method) is generally used.
Has been done. In this discharge capacity test method, a fully charged secondary battery is discharged at a constant current value, and the capacity of the secondary battery is measured from the product of the discharge time at that time.

In addition, for example, only the internal resistance of a secondary battery in a battery pack is measured as seen in the invention described in Japanese Patent Application No. 11-22815 of the present invention. Accordingly, there is a method of accurately diagnosing the capacity deterioration of the secondary battery (internal resistance measuring method). In this method, the correlation between the internal resistance of the secondary battery in the battery pack and the battery capacity is measured in advance, and the internal resistance value of the secondary battery corresponding to the battery capacity determined to be capacity degradation is determined. In this method, when the internal resistance of the secondary battery in the battery pack reaches the internal resistance defined as capacity deterioration, the capacity deterioration is diagnosed.

[0005]

However, the above-mentioned discharge capacity test method includes a charger for fully charging a secondary battery, a discharger for discharging, and a measuring circuit for measuring a discharge time. There is a problem that a dedicated measuring device is required outside. In addition, the above-described internal resistance measurement method has a problem in that a dedicated measurement device including an internal resistance measurement circuit for measuring the internal impedance of the secondary battery and a determination circuit for analyzing the impedance is required.

[0006] Further, the above-mentioned discharge capacity test method for judging capacity deterioration by actually discharging a secondary battery and measuring the battery capacity, and an internal resistance measurement for diagnosing capacity deterioration from a change in the internal resistance of the secondary battery. In the capacity deterioration determination of the secondary battery in the battery pack using the method, when performing the capacity determination of the secondary battery, after removing the battery pack from the portable terminal device and connecting to the dedicated measurement device, the discharge capacity test method or It is necessary to diagnose the battery by the internal resistance measurement method. For this reason, each time a battery pack is inspected, the battery pack is taken out of the portable terminal device and connected to a dedicated measuring device for measuring battery capacity deterioration and inspected. In addition, there is a problem that it is necessary to prepare a dedicated measuring device, which requires a great deal of labor.

There is another problem that the portable terminal device cannot be used while the battery pack is being removed.
The present invention has been made to solve the above-described problem, and it is possible to perform capacity deterioration diagnosis of a secondary battery in a battery pack for a portable terminal device while the secondary battery is built in the portable terminal device. The aim is to detect the deterioration of the capacity of the secondary battery without delay by shortening the work process related to the diagnosis and shortening the measurement time and performing the capacity deterioration diagnosis of the secondary battery while using the portable device. It is assumed that.

[0008]

In order to solve the above-mentioned problems, the present invention provides a secondary battery and a battery capacity deterioration judging unit for judging the capacity deterioration of the secondary battery (in the embodiment, the capacity deterioration judging unit). A wireless communication device (including a mobile phone, a portable information terminal, and the like), which includes a circuit, but the battery capacity deterioration determination unit is not limited to a circuit capacity determination unit.
In the above, the battery capacity deterioration determination unit discharges the secondary battery at a predetermined current value, and measures a discharge time to reach a predetermined voltage lower than a voltage in a fully charged state (discharge time in the embodiment). This means a time measurement circuit, but the discharge time measurement unit is not limited to a circuit configured by a circuit.)
Wherein the battery capacity deterioration determination unit determines that the battery capacity has deteriorated when the discharge time measured by the discharge time measurement unit becomes a predetermined value or less.

According to a second aspect of the present invention, in the wireless communication apparatus according to the first aspect, the battery capacity deterioration determining unit measures a temperature of the secondary battery. In the embodiment, the secondary battery thermometer is referred to.), And the battery capacity deterioration determination unit determines a discharge time serving as a reference for capacity deterioration determination according to the temperature measured by the secondary battery temperature measurement unit. It is characterized by correction.

According to a third aspect of the present invention, there is provided a wireless communication apparatus including a secondary battery and a battery capacity deterioration determining unit for determining capacity deterioration of the secondary battery, wherein the battery capacity deterioration determining unit is provided. Has an internal resistance measuring unit for measuring the internal resistance of the secondary battery (in the embodiment, it refers to an internal resistance measuring circuit; however, the internal resistance measuring unit is not limited to a circuit configured by a circuit); The battery capacity deterioration determining unit determines that the capacity is deteriorated when the internal resistance measured by the internal resistance measuring unit becomes equal to or less than a predetermined value.

According to a fourth aspect of the present invention, in the wireless communication apparatus according to the third aspect, the battery capacity deterioration determining section has a secondary battery temperature measuring section for measuring the temperature of the secondary battery. The battery capacity deterioration determining unit corrects an internal resistance value of the secondary battery serving as a criterion of capacity deterioration determination according to the temperature measured by the secondary battery temperature measuring unit.

According to a fifth aspect of the present invention, in the wireless communication apparatus according to any one of the first to fourth aspects, when the secondary battery is judged to be deteriorated by the battery capacity deterioration judging section. , Display or alarm or display and alarm. According to a sixth aspect of the present invention, in the wireless communication device according to any one of the first to fourth aspects, when the secondary battery is determined to be deteriorated by the battery capacity deterioration determination circuit, the secondary battery is charged. It is characterized by transmitting an external radio signal for notifying the capacity deterioration to the outside.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams for explaining the principle of the present invention. FIG. 1 is a diagram illustrating the principle of the present invention. 1 is a battery pack composed of a secondary battery and a protection circuit, 2
Is a display unit that displays an abnormality of the battery pack, etc., 3 is a capacity deterioration determination circuit that measures the battery capacity of the secondary battery in the battery pack and diagnoses capacity deterioration, and 4 is a determination result from the capacity deterioration determination circuit. This is a main control circuit unit that performs control necessary for realizing the main function of the portable terminal device and the control of inputting and outputting the same to the display circuit 2.

FIG. 2 is a flowchart for explaining the determination of capacity deterioration in FIG. First, when the capacity deterioration determination of the battery pack 1 is started (S100), a start signal is transmitted from the main control circuit unit 4 to the capacity deterioration determination circuit 3.
Then, the capacity deterioration determination circuit 3 diagnoses the battery capacity of the secondary battery in the battery pack 1 (S101). Then, the capacity deterioration determination circuit 3 determines whether or not the diagnosed battery capacity of the secondary battery in the battery pack 1 is equal to or more than a specified value, and outputs the result to the main control circuit unit 4 (S102). When the battery capacity of the secondary battery in the battery pack 1 is equal to or greater than the specified value, the main control circuit unit 4 displays on the display circuit 2 that the battery pack is normal (S104), and the battery of the secondary battery in the battery pack 1 If the capacity is equal to or less than the specified value, the main control circuit unit 4 causes the display circuit 2 to display that the battery pack is abnormal (S105).

With the above operation, the battery capacity of the secondary battery in the battery pack 1 is diagnosed, and when the capacity of the secondary battery is deteriorated, the capacity deterioration is displayed. FIG. 3 and FIG. 4 are diagrams for explaining the first embodiment. FIG. 3 is an example of a portable terminal device for explaining the first embodiment, wherein 1 is a battery pack composed of a secondary battery and a protection circuit, 1a is a secondary battery such as a lithium ion secondary battery, and 1b is Secondary battery 1
Protection circuit, 2 is a display unit for displaying an abnormality of the battery pack, etc., 3 is a capacity deterioration determination circuit for measuring the battery capacity of the secondary battery in the battery pack and diagnosing the capacity deterioration, 3a is a secondary battery Charge / discharge circuit for charging or discharging 1a, 3
b is a discharge time measuring circuit for measuring a discharge time when discharging from the secondary battery 1 to the charging / discharging circuit 3a, and 3c is a discharge time measured by the discharge time measuring circuit 3b and a capacity deterioration when performing capacity deterioration judgment. A discharge time determining circuit for comparing a reference value of the regarded discharge time with a capacity deterioration determining circuit;
The main control circuit section performs a control for inputting the judgment result from and outputting it to the display circuit 2 and a control necessary for realizing a main function of the portable terminal device.

FIG. 4 shows a discharge voltage characteristic when the secondary battery 1a is discharged, and shows a discharge voltage curve of the battery when discharged at a constant current. The vertical axis indicates voltage and the horizontal axis indicates time. V0 in FIG. 4 is a discharge end voltage of the secondary battery 1a, and T0 is a reference time for determining capacity deterioration. Here, as a method of determining T0, assuming that the initial battery capacity of the secondary battery 1a is H0 and the remaining battery capacity ratio for determining that the capacity is deteriorated is P% (for example, 50%), T0 is obtained by the following equation. be able to.

T0 = P × H0 ÷ I0 (where I0 is a discharge current) Further, in FIG. 4, a discharge curve A is a discharge characteristic of a new secondary battery 1a, and the secondary battery 1a is charged and discharged many times. Is repeated, the discharge curve changes to the discharge curve B and the discharge curve C, and the capacity of the secondary battery 1a is degraded. Next, the operation of FIG. 3 will be described. First, the charge / discharge circuit 3a in the capacity deterioration determination circuit 3 executes charging until the secondary battery 1a is fully charged, and then discharges the fully charged secondary battery 1a with a constant discharge current. During the discharge, the discharge time measuring circuit 3b measures the actual discharge time T1, which is the elapsed time from the start of the discharge to the end voltage V0. Thereafter, the data of the actual discharge time T1 is input to the discharge time determination circuit 3c, and is compared with the determination reference time T0. When T1> T0, the secondary battery 1a has no capacity deterioration,
When T1 <T0, it is determined that the capacity of the secondary battery 1a is deteriorated. The determination result is output from the discharge time determination circuit 3c to the main control circuit unit 4, and when the capacity of the secondary battery 1a is deteriorated,
The main control circuit unit 4 outputs a signal to the display unit 2 to indicate that the capacity of the secondary battery 1a has deteriorated, and the display unit 2 indicates that the capacity of the secondary battery 1a has deteriorated. .

In the example of FIG. 4, when the secondary battery 1a is discharged, in the case of the discharge curve A or the discharge curve B, since T1 (point A or point B)> T0, it is determined that there is no capacity deterioration. On the other hand, when the secondary battery 1a is discharged, in the case of the discharge curve C, since T1 <T0, it is determined that the capacity is deteriorated. Also,
In FIG. 4, the determination reference time is changed from the full charge to the end voltage V0.
However, the reference time may be a voltage lower than the voltage in the fully charged state and higher than the end voltage V0. By doing so, the determination time can be reduced.

With the above operation, the capacity deterioration of the secondary battery 1a in the battery pack 1 is diagnosed by using the capacity deterioration determination circuit 3 built in the portable terminal device, and the capacity of the secondary battery 1a is deteriorated. , Capacity deterioration can be displayed. FIG. 5 and FIG. 6 are diagrams for explaining the second embodiment. FIG. 5 is an example of a portable terminal device for explaining the second embodiment, wherein 1 is a battery pack composed of a secondary battery and a protection circuit, 1a is a secondary battery such as a lithium ion secondary battery, and 1b is A protection circuit for the secondary battery 1, a display unit 2 for displaying an abnormality of the battery pack, and the like, a capacity degradation determination circuit 3 for measuring the battery capacity of the secondary battery in the battery pack and diagnosing the capacity degradation, 3 d Is an internal resistance measuring circuit for measuring the internal resistance of the secondary battery 1a, 3e is a value of the internal resistance measured by the internal resistance measuring circuit 3d and a reference value of the internal resistance regarded as the capacity deterioration when the capacity deterioration is determined. The internal resistance determination circuit 4 is configured to control the input of the determination result from the capacitance deterioration determination circuit 3 and output the result to the display circuit 2 and to perform the control necessary for realizing the main function of the portable terminal device. Consists of a control circuit

The battery pack 1 and the internal resistance measuring circuit 3
d is an upper node of the protection circuit 1b, a node between the protection circuit 1b and the secondary battery 1a, and a node on the negative electrode side of the secondary battery 1a. The internal resistance measurement circuit 3d includes a protection circuit 1b
AC or DC current flows through the upper node and the secondary battery 1a negative node, and at the same time, changes in the voltage across the secondary battery 1a are detected by the protection circuit 1b, the node between the secondary batteries 1a, and the secondary battery 1a negative node. And the measured change in the voltage across the secondary battery 1a is divided by the value of the AC or DC current to obtain the secondary battery 1a.
Is determined.

FIG. 6 is a diagram showing the relationship between the battery capacity and the internal resistance which change with the capacity deterioration of the secondary battery (example of lithium ion secondary battery) 1a, and the horizontal axis shows the battery capacity (% display). ) And the vertical axis indicates the internal resistance (Ω). Here, the internal resistance in the case of a new battery (no capacity deterioration: when the battery capacity is 100%) is defined as R0, and as an example, the capacity of the secondary battery 1a is up to P% (for example, the remaining capacity of the battery capacity: 50%). When the time when the battery voltage decreases is defined as capacity deterioration, the secondary battery 1a
Is the reference resistance for determining the capacity deterioration.

Next, the operation of FIG. 5 will be described. First, the internal resistance measuring circuit 3d in the capacity deterioration determining circuit 3 measures the internal resistance R of the secondary battery 1a in the battery pack 1. Next, the value of the internal resistance R of the secondary battery 1a is input to the internal resistance determination circuit 3e. The internal resistance determination circuit 3e compares the internal resistance R of the secondary battery 1a with a reference resistance R1 for determining the internal resistance regarded as capacity deterioration. If R <R1, the secondary battery 1a has no capacity deterioration and R> R1. In this case, it is determined that the capacity of the secondary battery 1a is deteriorated. The result of the determination is stored in the internal resistance determination circuit 3e.
Is output to the main control circuit section 4, and when the capacity of the secondary battery 1a is deteriorated, the main control circuit section 4 sends a signal to the display section 2 to indicate that the capacity of the secondary battery 1a is deteriorated. Then, the display unit 2 displays that the capacity of the secondary battery 1a is deteriorated.

The method of determining the capacity deterioration of the secondary battery based on the internal resistance can be performed more quickly than the method of measuring the discharge time. Therefore, the method of determining the capacity deterioration of the secondary battery based on the internal resistance is more suitable for determining the capacity deterioration of the secondary battery built in the portable terminal device. With the above operation, the battery capacity of the secondary battery 1a in the battery pack 1 is diagnosed by using the capacity deterioration determination circuit 3 built in the portable terminal device. When the capacity of the secondary battery 1a is deteriorated, the capacity deterioration is performed. Can be displayed.

FIGS. 7 and 8 are diagrams for explaining the third embodiment. FIG. 7 is an example of a portable terminal device for explaining the third embodiment, wherein 1 is a battery pack composed of a secondary battery and a protection circuit, 1a is a secondary battery such as a lithium ion secondary battery, and 1b is Protection circuit for secondary battery 1, 1 c
Is a thermometer for measuring the temperature of the secondary battery 1a, 2 is a display unit for displaying an abnormality of the battery pack, etc., 3 is a capacity for measuring the battery capacity of the secondary battery in the battery pack and diagnosing the capacity deterioration. The deterioration determination circuit, 3a is a charge / discharge circuit for charging or discharging the secondary battery 1a, 3b is a discharge time measurement circuit for measuring a discharge time when discharging from the secondary battery 1 to the charge / discharge circuit 3a, and 3c is The discharge time determination circuit 4 compares the discharge time measured by the discharge time measurement circuit 3b with a reference value of the discharge time considered as the capacity deterioration when performing the capacity deterioration determination. It comprises a main control circuit unit for performing control for inputting and outputting to the display circuit 2 and control necessary for realizing the main function of the portable terminal device.

FIG. 8 shows the battery temperature Q of the secondary battery 1a and FIG.
Shows the relationship with the capacity reference time T0 shown in FIG. The reference time T0 is a discharge time when the secondary battery 1 is discharged at a constant current. According to FIG. 8, the discharge time T0 has a temperature characteristic. Therefore, in order to accurately judge the capacity deterioration of the secondary battery, it is necessary to make a correction corresponding to the temperature of the secondary battery.

For example, when a group of temperature characteristic data (Q, T0 (Q)) of FIG. 8 measured in advance is prepared and temperature correction for capacity deterioration determination is performed, a certain battery temperature Q is determined using this temperature characteristic data. Is determined for the determination reference time T0 (Q). The operation of FIG. 7 will be described. First, the charge / discharge circuit 3a in the capacity deterioration determination circuit 3 executes charging of the secondary battery 1a until it is fully charged, and thereafter, the secondary battery 1a in the fully charged state
a is discharged with a constant discharge current. During the discharge,
The discharge time measuring circuit 3b measures the discharge time T1, which is the elapsed time from the start of discharge to the end voltage V0. afterwards,
The data of the discharge time T1 is input to the discharge time determination circuit 3c. On the other hand, the battery temperature Q of the secondary battery 1a is measured by the thermometer 1c, and the battery temperature Q is input to the discharge time determination circuit 3c. Further, the temperature characteristic data (Q, T0 (Q)) group of FIG. 8 is stored in advance in the discharge time determination circuit 3c, and a determination corresponding to the battery temperature Q measured by the thermometer 1c is made from the temperature characteristic data. The reference time T0 is determined. The reference time T0 is used as the reference time T0 in the second embodiment.

The subsequent operation is the same as in the second embodiment. By the above operation, by using the temperature-compensated judgment reference time as the judgment reference time T0, even when the battery temperature changes, the battery capacity diagnosis of the secondary battery 1a in the battery pack 1 is accurately performed, and the secondary When the capacity of the battery 1a is deteriorated, the capacity deterioration can be accurately displayed.

FIGS. 9 and 10 are views for explaining the fourth embodiment. FIG. 9 is an example of a portable terminal device for explaining the fourth embodiment, wherein 1 is a battery pack including a secondary battery and a protection circuit, 1a is a secondary battery such as a lithium ion secondary battery, and 1b is Protection circuit for secondary battery 1, 1 c
Is a thermometer for measuring the temperature of the secondary battery 1a, 2 is a display unit for displaying an abnormality of the battery pack, etc., 3 is a capacity for measuring the battery capacity of the secondary battery in the battery pack and diagnosing the capacity deterioration. The deterioration determination circuit 3d is an internal resistance measurement circuit that measures the internal resistance of the secondary battery 1a, and the internal resistance 3e is the internal resistance measured by the internal resistance measurement circuit 3d and the internal resistance that is regarded as capacity deterioration when capacity deterioration determination is performed. An internal resistance judging circuit 4 for comparing the resistance with a reference value is required for realizing the control of inputting the judgment result from the capacity deterioration judging circuit 3 and outputting it to the display circuit 2 and realizing the main functions of the portable terminal device. It is composed of a main control circuit unit that performs various controls.

The battery pack 1 and the internal resistance measuring circuit 3
d is an upper node of the protection circuit 1b, a node between the protection circuit 1b and the secondary battery 1a, and a node on the negative electrode side of the secondary battery 1a. The internal resistance measurement circuit 3d includes a protection circuit 1b
AC or DC current flows through the upper node and the secondary battery 1a negative node, and at the same time, changes in the voltage across the secondary battery 1a are detected by the protection circuit 1b, the node between the secondary batteries 1a, and the secondary battery 1a negative node. The change in the voltage across the measured secondary battery 1a is divided by the value of the AC or DC current to obtain the secondary battery 1a.
Is determined.

FIG. 10 shows the relationship between the battery temperature Q of the secondary battery 1a and the reference resistance R1 for judging the capacity deterioration shown in FIG. The reference resistance R1 is an internal resistance value of the secondary battery 1a that is determined to have a capacity deterioration, and has a temperature characteristic as shown in FIG. Therefore, in order to accurately judge the capacity deterioration of the secondary battery, it is necessary to make a correction corresponding to the temperature of the secondary battery.

For example, when a group of temperature characteristic data (Q, R1 (Q)) of FIG. 8 measured in advance is prepared and temperature correction for capacity deterioration determination is performed, a certain battery temperature Q is determined using this temperature characteristic data. Is determined for the determination reference resistance R1 (Q). Next, the operation of FIG. 9 will be described. First, the internal resistance measuring circuit 3d in the capacity deterioration determining circuit 3
The internal resistance R of the secondary battery 1a is measured. Next, the value of the internal resistance R of the secondary battery 1a is input to the internal resistance determination circuit 3e. On the other hand, the battery temperature Q of the secondary battery 1a is measured by a thermometer 1c.
And the battery temperature Q is input to the internal resistance determination circuit 3e. Further, in the internal resistance determination circuit 3e, a group of temperature characteristic data (Q, R1 (Q)) of FIG. 10 is stored in advance, and the temperature characteristic data corresponding to the battery temperature Q measured by the thermometer 1c is stored based on the temperature characteristic data. The determination reference resistance R1 (Q) is determined. Then, this determination reference resistance R1 is used in the third embodiment.
Is determined as the reference resistance R1.

The subsequent operation is the same as in the third embodiment. With the above operation, by using the temperature-compensated judgment reference resistor as the judgment reference resistor R1, even if the battery temperature changes, the battery capacity diagnosis of the secondary battery 1a in the battery pack 1 is accurately performed, and the secondary When the capacity of the battery 1a is deteriorated, the capacity deterioration can be accurately displayed.

FIG. 11 shows a portable terminal device according to a fifth embodiment. Reference numeral 1 denotes a secondary battery or a protection circuit shown in FIGS. 1, 3, 5, 7, 9 and the like. Battery pack, 2
Is a display unit for displaying an abnormality of the battery pack, etc., 2a is a liquid crystal display driver, 2b is a liquid crystal display device, 2c is an alarm / warning device, and 3 is described in FIG. 1, FIG. 3, FIG. 5, FIG. The capacity degradation determination circuit 4 measures the battery capacity of the secondary battery in the battery pack and diagnoses the capacity degradation, and the capacity degradation determination circuit 4 described in FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. It comprises a main control circuit unit for performing control for inputting the judgment result from the capacity deterioration judgment circuit 3 and outputting it to the display circuit 2 and for performing control necessary for realizing the main function of the portable terminal device.

The basic operation for determining the capacity deterioration is the same as that described in the embodiment shown in FIGS. 1, 3, 5, 7, and 9, but in the present embodiment, Is determined to have a capacity deterioration, the main control circuit unit 4 outputs a signal to the display unit 2 to indicate that the capacity of the secondary battery 1a is deteriorated. Simultaneously with the indication of the deterioration, the main control circuit unit 4 sounds an alarm sound to the alarm alarm device 2 to notify the outside of the capacity deterioration.

It should be noted that the main control circuit section 4 may selectively perform display or alarm or display and alarm. By the above operation, when the battery temperature changes by using the alarm alarm device 2 built in the portable terminal device,
By emitting an alarm sound, the secondary battery 1a
Can be notified of capacity deterioration.

FIG. 12 shows a portable terminal device according to the sixth embodiment. Reference numeral 1 denotes a secondary battery and a protection circuit shown in FIGS. 1, 3, 5, 7, and 9 and the like. Battery pack, 2
Is a display unit for displaying an abnormality of the battery pack, etc., 2a is a liquid crystal display driver, 2b is a liquid crystal display device, 2d is an external wireless signal generation device, 3 is FIG. 1, FIG. 3, FIG. 5, FIG. A capacity deterioration determination circuit that measures the battery capacity of the secondary battery in the battery pack described in and performs a capacity deterioration diagnosis,
The control of inputting the judgment result from the capacity deterioration judging circuit 3 described in FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. 9 and the like and outputting it to the display circuit 2 realizes the main function of the portable terminal device. It is composed of a main control circuit unit that performs necessary control to perform the control.

The basic operation for determining the capacity deterioration is the same as the operation of the embodiment shown in FIGS. 1, 3, 5, 7, and 9, but in this embodiment, Is determined to have a capacity deterioration, the main control circuit unit 4 outputs a signal to the display unit 2 to indicate that the capacity of the secondary battery has deteriorated, and the display unit 2 indicates that the capacity of the secondary battery has deteriorated. At the same time, the main control circuit unit 4 transmits a radio signal of capacity deterioration to the external radio signal generator 2 and notifies the outside of the capacity deterioration.

With the above operation, when the battery temperature changes by using the external radio signal generator 2 built in the portable terminal device, a radio signal of capacity deterioration is emitted, and the secondary battery 1a Can be notified of capacity deterioration. Note that the protection circuit 1b may be configured by a resistor.

[0039]

As described above, according to the present invention, a portable terminal device incorporates a battery capacity deterioration judgment circuit using a temperature compensation type discharge capacity measurement method or an internal resistance measurement method, and a secondary battery in a battery pack. By diagnosing the capacity deterioration of the secondary battery, it is possible to determine the capacity deterioration of the secondary battery while the secondary battery is connected to the portable terminal device.

Further, the temperature compensation circuit of the two-hour battery
Even if the temperature of the secondary battery changes, the determination can be made with high accuracy. Further, when the capacity of the secondary battery is deteriorated, a timing for replacing the battery pack can be obtained by a display, an alarm sound, or an external signal transmission.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a flowchart illustrating a determination of capacity deterioration in FIG. 1;

FIG. 3 is a diagram for explaining a portable terminal device according to the first embodiment.

FIG. 4 is a diagram for explaining voltage characteristics at the time of discharge for explaining the first embodiment;

FIG. 5 is a diagram illustrating a portable terminal device according to a second embodiment.

FIG. 6 is a graph illustrating a relationship between a battery capacity and an internal resistance according to a second embodiment.

FIG. 7 is a diagram illustrating a portable terminal device according to a third embodiment.

FIG. 8 is a diagram illustrating a relationship between a battery temperature and a determination reference time according to a third embodiment.

FIG. 9 is a diagram illustrating a portable terminal device according to a fourth embodiment.

FIG. 10 is a diagram for explaining a relationship between a battery temperature and a determination reference resistance for explaining a fourth embodiment;

FIG. 11 is a diagram illustrating a portable terminal device according to a fifth embodiment.

FIG. 12 is a diagram illustrating a portable terminal device according to a sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery pack including secondary battery and protection circuit 1a Secondary battery 1b Protection circuit 1c Thermometer 2 Display unit 2a Liquid crystal display driver 2b Liquid crystal display device 2c Alarm / warning device 2d External wireless signal generator 3 Capacity deterioration judgment circuit 3a Charge / discharge Circuit 3b Discharge time measurement circuit 3c Discharge time determination circuit 3d Internal resistance measurement circuit 3e Internal resistance determination circuit 4 Main control circuit section

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI theme coat ゛ (Reference) H04M 1/725 H04B 7/26 109T (72) Inventor Kazuki Nakamura 2-1-1 Toranomon, Minato-ku, Tokyo F-term in NTT Mobile Communication Network Co., Ltd. (reference)

Claims (6)

[Claims] 1. A wireless communication device having a built-in secondary battery and a battery capacity deterioration judging unit for judging capacity deterioration of the secondary battery, wherein the battery capacity deterioration judging unit operates the secondary battery at a predetermined current. Discharge at a value, having a discharge time measurement unit that measures a discharge time to reach a predetermined voltage lower than the voltage in the fully charged state, the battery capacity deterioration determination unit, the discharge time measured by the discharge time measurement unit A wireless communication apparatus characterized in that it is determined that the capacity has deteriorated when the value falls below a predetermined value. 2. The wireless communication device according to claim 1, wherein the battery capacity deterioration determination unit has a secondary battery temperature measurement unit that measures the temperature of the secondary battery, A wireless communication device, wherein a discharge time serving as a criterion for determining capacity deterioration is corrected in accordance with a temperature measured by the secondary battery temperature measurement unit. 3. A wireless communication device having a built-in secondary battery and a battery capacity deterioration judging unit for judging a capacity deterioration of the secondary battery, wherein the battery capacity deterioration judging unit comprises an internal resistance measuring unit of the secondary battery. The wireless communication device, characterized in that the battery capacity deterioration determination unit determines that the battery capacity has deteriorated when the internal resistance measured by the internal resistance measurement unit becomes a predetermined value or less. 4. The wireless communication device according to claim 3, wherein the battery capacity deterioration determination unit has a secondary battery temperature measurement unit that measures the temperature of the secondary battery, A wireless communication device, wherein an internal resistance value of a secondary battery serving as a criterion of capacity deterioration determination is corrected according to a temperature measured by the secondary battery temperature measurement unit. 5. The wireless communication device according to claim 1, wherein a display or a warning or a display and a warning is performed when the battery capacity deterioration determination unit determines that the secondary battery has deteriorated. A wireless communication device characterized by the above-mentioned. 6. The wireless communication device according to claim 1, wherein when the battery capacity deterioration determination circuit determines that the secondary battery has deteriorated, the capacity deterioration of the secondary battery is notified to the outside. A wireless communication device for transmitting an external wireless signal for notification.