JP2014131451A - Charging control device, portable terminal, and charging control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a secondary battery to be used for a long time by preventing the secondary battery from deteriorating by stopping charging the secondary battery before the deterioration of the secondary battery appears truly.SOLUTION: In a charging control device (1), a weighting value selection part (12) selects a weighting value according to secondary battery temperature information that a temperature information acquisition part (11) acquires, a weighting value integration part (13) integrates the weighting value, and a charging stop part (14) stops charging a secondary battery (2) when the integrated weighting value reaches a threshold.

Description

  The present invention relates to a charge control device, a portable terminal, and a charge control program, and more particularly, to a charge control device that controls charging of a secondary battery built in an electronic device such as a portable terminal.

  Some electronic devices are supplied with electric power by a secondary battery built in the electronic device. In particular, secondary batteries are often built into electronic devices that are carried by users, such as portable terminals.

  However, during the operation of such an electronic device, the secondary battery built in the electronic device may become hot. For example, in a portable terminal, when a control unit that performs information processing becomes high temperature, a secondary battery located in the vicinity thereof also becomes high temperature. In addition, a charging current supplied to the secondary battery from a charge control device that charges and / or discharges the secondary battery may increase the temperature of the secondary battery.

  As described above, the high temperature of the secondary battery may cause battery deterioration in the secondary battery or cause a failure in an electronic device in which the secondary battery is built. is there. In addition, it is not preferable that the time during which the electronic device is at a temperature higher than the temperature that is normally assumed to be used for a long time is caused because various problems are caused.

  Therefore, conventionally, an invention for controlling the operation of the electronic device or the charging control device based on the measured temperature of the secondary battery, the electronic device, or the charging control device has been disclosed. For example, Patent Documents 1 to 3 disclose techniques for stopping charging a secondary battery, reducing a charging voltage value, or stopping a processing operation executed in the apparatus when the measured temperature is equal to or higher than a predetermined value. Have been described. In relation to the above technique, Patent Document 4 describes a portable electronic device that includes two temperature sensors in order to more accurately measure the temperature of the secondary battery or the electronic device itself.

Japanese Patent Laid-Open No. 2-2446739 (published on October 2, 1990) JP 2007-43422 A (published February 15, 2007) JP 2012-115080 A (released on June 14, 2012) JP 2010-25754 A (published February 4, 2010)

  However, the conventional technology as described above has a problem that the secondary battery continues to be in a high temperature state, and the deterioration of the secondary battery appears remarkably.

  The present invention has been made in view of the above problems, and its purpose is to stop the charging of the secondary battery until the deterioration of the secondary battery appears, and to prevent the deterioration of the secondary battery. This is to prevent the secondary battery from being used for a long time.

  In order to solve the above problem, a charge control device according to one aspect of the present invention includes a temperature information acquisition unit that acquires secondary battery temperature information indicating a temperature of a secondary battery built in an electronic device, and the temperature. Weighting value selection means for selecting a weighting value from the secondary battery temperature information acquired by the information acquisition means, weighting value integration means for integrating the weighting value selected by the weighting value selection means, and weighting value integration means Charging stop means for stopping the charging of the secondary battery when the weighted value is equal to or greater than a threshold value.

  According to one aspect of the present invention, the weight value selection unit selects a weight value from the secondary battery temperature information acquired by the temperature information acquisition unit, the weight value integration unit integrates the weight value, and the integration is performed. When the weighted value reaches the threshold value, the charging stop unit stops charging the secondary battery.

  That is, the weighting value is set so that the weighting value increases according to the increase in temperature from the battery temperature at which the deterioration of the secondary battery does not progress so much to the battery temperature at which the deterioration rate becomes significantly high. Is set so as to correspond to a time during which the deterioration rate of the secondary battery is significantly increased. Thereby, the charge stop means can accurately determine the timing at which the deterioration of the secondary battery appears clearly. Therefore, the charging stop means can stop the charging of the secondary battery until the deterioration of the secondary battery is manifested, and can prevent the secondary battery from being deteriorated. The effect which makes it possible is produced.

It is a block diagram which shows the structure of the electronic device provided with the charge control apparatus which concerns on one Embodiment of this invention. 2 is a flowchart of an operation executed by the electronic device of FIG. In FIG. 2, it is the flowchart which described concretely operation | movement (S3) of the temperature information acquisition part which determines secondary battery temperature information. It is a figure which shows the weighting value table provided in the electronic device of FIG. It is a figure which shows the temperature correlation table provided in the electronic device of FIG.

  An embodiment of the present invention will be described below with reference to FIGS. Descriptions of configurations other than those described in the following specific embodiments may be omitted as necessary, but are the same as those configurations when described in other embodiments. For convenience of explanation, members having the same functions as those shown in each embodiment are given the same reference numerals, and the explanation thereof is omitted as appropriate.

[1. About device configuration)
First, a schematic configuration of an electronic device 10 for realizing the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating a schematic configuration of the entire electronic device 10. As shown in the figure, the electronic device 10 includes a charging control device 1, a secondary battery 2, a secondary battery temperature sensor 3, and a device 4 (hereinafter simply referred to as “peripheral device” provided around the secondary battery). ”), A peripheral device temperature sensor 5, and a storage unit 6.

  The secondary battery 2 is also called a storage battery or a rechargeable battery, and is mainly built in an electronic device. Examples of secondary batteries include those using lithium ions or lithium polymers.

  The secondary battery temperature sensor 3 detects the temperature of the secondary battery 2 built in the electronic device 10 as the secondary battery temperature. The secondary battery temperature sensor 3 is composed of, for example, a thermistor.

  The peripheral device 4 of the secondary battery is provided around the secondary battery 2 built in the electronic device 10 and is a device that easily causes a change in the temperature of the secondary battery 2. Examples of such peripheral devices include a CPU and a GPS sensor.

  The peripheral device temperature sensor 5 detects the temperature of the peripheral device 4 as peripheral device temperature information, and is composed of, for example, a thermistor.

  The storage unit 6 is realized by an HDD (Hard Disk Drive) or a flash memory, and includes a temperature correlation table 6a and a weight value table 6b. Details of these two tables will be described later.

  In addition, the charging control device 1 includes a temperature information acquisition unit 11, a weight value selection unit 12, a weight value integration unit 13, and a charge stop unit 14. The temperature information acquisition unit 11 acquires secondary battery temperature information indicating the temperature of the secondary battery 2 built in the electronic device 10. Three embodiments are assumed as embodiments for acquiring secondary battery temperature information. Details of these three embodiments will be described later. The weight value selection unit 12 selects an appropriate weight value obtained by an experiment or the like with reference to the weight value table 6b for the secondary battery temperature information acquired by the temperature information acquisition unit 11. The weighting value integration unit 13 integrates the weighting values selected by the weighting value selection unit 12. The charging stop unit 14 stops charging the secondary battery 2 when the weighted value accumulated by the weighted value integrating unit 13 is equal to or greater than the threshold value.

  In the electronic device 10 having the configuration described above, the charging control device 1 stops charging the secondary battery 2 until the deterioration of the secondary battery 2 appears. As a result, the secondary battery 2 can be prevented from deteriorating, and the secondary battery 2 can be used for a long time. Hereinafter, the points where the effect is achieved will be described, and the three embodiments described above will also be described. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

[2. About common flow)
First, a common flow of processing executed by the electronic device 10 having the configuration shown in FIG. 1 will be described with reference to FIG.

  First, the temperature information acquisition unit 11 acquires the secondary battery temperature directly detected by the secondary battery temperature sensor 3 (step 1. Hereinafter, “step” is simply referred to as “S”). On the other hand, the temperature information acquisition unit 11 acquires peripheral device temperature information detected by the peripheral device temperature sensor 5 (S2). Then, the temperature information acquisition unit 11 determines secondary battery temperature information using at least one of the secondary battery temperature acquired in S1 and the peripheral device temperature information acquired in S2 (S3).

  In [Embodiment 1] described later, the secondary battery temperature (secondary battery temperature α) acquired in S1 is determined as secondary battery temperature information. In [Embodiment 2] described later, the secondary battery temperature (secondary battery temperature β) obtained by converting the peripheral device temperature information acquired in S2 by the temperature correlation table 6a is used as the secondary battery temperature information. It is determined. Furthermore, in [Embodiment 3] described later, the higher one of the secondary battery temperature α and the secondary battery temperature β is determined as the secondary battery temperature information. Details of the first to third embodiments will be described later in the description of the flowchart of FIG.

  Then, after the secondary battery temperature information is determined in S3, the weight value selection unit 12 selects a weight value corresponding to the secondary battery temperature information determined in S3 with reference to the weight value table 6b. (S4).

  Here, the setting of the weight value table 6b built in the electronic apparatus 10 having the configuration shown in FIG. 1 will be described in detail with reference to FIG. The weighting value table 6b is a table in which weighting values are set so as to correspond to the secondary battery temperature information. Appropriate weighting values obtained by experiments or the like are obtained in a long time at a low temperature, and in a short time at a high temperature. A value that increases the integrated weighting value is stored in advance.

  For example, there is a lithium ion battery in which deterioration starts gradually from 43 ° C., and when the charge / discharge is repeated at 50 ° C. or higher, the deterioration of the secondary battery appears significantly. For such a lithium ion battery, as shown in FIG. 4, a weighting value (20) for the secondary battery (43 ° C.) and a weighting value (4500 for the secondary battery temperature (50 ° C.)). ) Should be set. Further, the deterioration of the secondary battery becomes more prominent in a shorter time as the secondary battery temperature becomes higher. For this reason, in the weighting value table 6b shown in FIG. 4, the weighting value is set to increase as the secondary battery temperature becomes higher.

  In general, when the temperature of the secondary battery exceeds a certain level, the deterioration of the secondary battery starts to appear prominently.If charging and discharging are repeated at a high temperature, the capacity of the secondary battery decreases, and gas is generated inside the secondary battery. It occurs and swells. In particular, a rechargeable secondary battery such as lithium ion or lithium polymer has a characteristic that when the battery is left at high temperature in a high capacity state, the secondary battery tends to swell and the secondary battery is likely to deteriorate significantly. Such a problem appears more clearly as the secondary battery capacity increases. Therefore, it is desirable to prepare different weight value tables according to the size of the secondary battery capacity.

  Then, the weight value integration unit 13 integrates the weight values selected by the weight value selection unit 12 in S4 (S5 in FIG. 2), and the charge stop unit 14 determines that the weight values integrated by the weight value integration unit 13 are in advance. When the threshold value is exceeded (S6), charging of the secondary battery 2 is stopped (S8).

  For example, when the temperature information acquisition unit 11 determines 43 ° C. as the secondary battery temperature information, the weight value selection unit 12 refers to the weight value table 6 b and the secondary battery temperature information acquired by the temperature information acquisition unit 11. A weight value (20) corresponding to (43 ° C.) is selected. The weight value accumulation unit 13 accumulates the weight value (20) selected by the weight value selection unit 12.

  If the secondary battery temperature information (43 ° C.) from the temperature information acquisition unit 11 is continuously notified to the weight value selection unit 12, the weight value integration unit 13 sets the weight value (20) using a 10-second counter. Accumulate. The charging stop unit 14 stops charging the secondary battery 2 when the weighted value accumulated by the weighted value accumulating unit 13 is equal to or higher than the weighting value threshold (54000). That is, the charging stop unit 14 stops charging the secondary battery 2 within 7 hours and 30 minutes after the secondary battery temperature information from the temperature information acquisition unit 11 reaches 43 ° C.

  If the secondary battery temperature information (50 ° C.) from the temperature information acquisition unit 11 is continuously notified to the weight value selection unit 12, the weight value integration unit 13 uses a 10-second counter to calculate the weight value (4500). ). The charging stop unit 14 stops charging the secondary battery 2 when the weighted value accumulated by the weighted value accumulating unit 13 is equal to or higher than the weighting value threshold (54000). That is, the charging stop unit 14 stops charging the secondary battery 2 within 2 minutes after the secondary battery temperature information from the temperature information acquisition unit 11 reaches 50 ° C.

  If the weighted value integrated by the weighted value integrating unit 13 is less than the threshold value, the charging control device 1 continues to charge the secondary battery 2 as shown in S7. And charging control apparatus 1 repeats the initial step of the flowchart of FIG. 2 again, continuing charging. That is, the charging control device 1 executes the processes of S1 and S2 again.

  According to the above configuration, the weight value selection unit 12 selects a weight value from the secondary battery temperature information acquired by the temperature information acquisition unit 11, the weight value integration unit 13 integrates the weight value, and the integration is performed. When the weighted value reaches the threshold value, the charging stop unit 14 stops charging the secondary battery 2. In other words, the weighting value is set so that the weighting value increases from the battery temperature at which the deterioration of the secondary battery 2 does not progress so much to the battery temperature at which the deterioration rate of the secondary battery 2 is significantly increased. In addition, the threshold value of the integrated value of the weighting values is set so as to correspond to the time when the deterioration rate of the secondary battery 2 is significantly increased. Thereby, the charge stop part 14 can judge accurately the timing when deterioration of the secondary battery 2 appears clearly. Therefore, the charging stop unit 14 can stop the charging of the secondary battery 2 until the deterioration of the secondary battery 2 is manifested, and can prevent the secondary battery 2 from being deteriorated. Can be used for a long time.

[3. Embodiment 1]
Next, an example of the operation of the temperature information acquisition unit 11 will be described in detail with reference to FIG. In the present embodiment, the secondary battery temperature detected by the secondary battery temperature sensor 3 is used as secondary battery temperature information, and S1, S31, and S35 in FIG. 3 are assumed. Note that S2, S32 to S34, S36, and S37 will be described later in the second and third embodiments.

  The temperature information acquisition unit 11 acquires the secondary battery temperature (secondary battery temperature α) from the secondary battery temperature sensor 3 (S1), and the secondary battery temperature α is equal to or higher than a temperature at which battery deterioration is noticeable. In step S31, the temperature information acquisition unit 11 determines the secondary battery α as the secondary battery temperature information (S35), and notifies the weight value selection unit 12 of the secondary battery α.

  According to said structure, the temperature information acquisition part 11 determines the secondary battery temperature (secondary battery temperature (alpha)) directly detected by the secondary battery temperature sensor 3 as secondary battery temperature information. For this reason, since the temperature information acquisition part 11 can determine the secondary battery temperature information correctly, it can avoid reliably the risk that the deterioration of the secondary battery 2 will appear clearly. Therefore, the deterioration of the secondary battery 2 can be accurately prevented, and the secondary battery 2 can be used for a long time.

  According to the above configuration, since the peripheral device temperature sensor 5 is not used, the temperature information acquisition unit 11 acquires the peripheral device temperature detected by the peripheral device temperature sensor 5 and refers to the temperature correlation table 6a to The process of converting the device temperature into the secondary battery temperature (secondary battery temperature β) and comparing the secondary battery temperature α and the secondary battery temperature β can be omitted. For this reason, the process from the acquisition of the secondary battery temperature to the stop of charging can be quickly performed, and the temperature information acquisition unit 11 acquires the secondary battery temperature α from the secondary battery temperature sensor 3. Time until the secondary battery temperature information is determined can be shortened. Therefore, the charging stop unit 14 stops charging the secondary battery 2 immediately in response to the change in the secondary battery temperature α until the deterioration of the secondary battery 2 is manifested. 2 can be prevented, and the secondary battery 2 can be used for a long time.

[4. Embodiment 2]
Next, another example of the operation of the temperature information acquisition unit 11 will be described in detail with reference to FIG. In the present embodiment, the secondary battery temperature information is determined from the peripheral device temperature information detected by the peripheral device temperature sensor 5, and S1, S2, S31 to S34, and S36 in FIG. 3 are assumed. . Note that S37 will be described later in the third embodiment.

  The temperature information acquisition unit 11 acquires the secondary battery temperature (secondary battery temperature α) directly detected by the secondary battery temperature sensor 3 (S1). On the other hand, the temperature information acquisition unit acquires peripheral device temperature information from the peripheral device temperature sensor 5 (S2), refers to the temperature correlation table 6a (S32), and corresponds to the peripheral device temperature information acquired in S2. The obtained secondary battery temperature (secondary battery temperature β) is acquired (S33).

  Here, the setting of the temperature correlation table 6a built in the electronic apparatus 10 having the configuration shown in FIG. 1 will be described with reference to FIG. The temperature correlation table 6a is a table in which secondary battery temperatures are set so as to correspond to peripheral device temperature information, and appropriate secondary battery temperatures obtained by experiments or the like are stored in advance. For example, when the peripheral device temperature becomes higher than the secondary battery temperature, the secondary battery 2 becomes high temperature due to the influence of thermal radiation from the peripheral device 4, and the deterioration of the secondary battery 2 may progress. For this reason, secondary battery temperature (40 degreeC) etc. are set with respect to peripheral device temperature information (45 degreeC).

  Then, the temperature information acquisition unit 11 determines whether or not the secondary battery temperature α is higher than the secondary battery temperature β and the secondary battery temperature α is equal to or higher than a temperature at which the deterioration of the secondary battery 2 is noticeable ( (S31 in FIG. 3). If the secondary battery temperature α is equal to or lower than the secondary battery temperature β, or if the secondary battery temperature α is lower than a temperature at which the deterioration of the secondary battery 2 is noticeable, the temperature information acquisition unit 11 The difference between the secondary battery temperature α and the secondary battery temperature β is taken, and it is determined whether this difference is outside the proper range (S34). The appropriate range of the secondary battery temperature difference can be set to 3 ° C., for example. Furthermore, if this difference is outside the appropriate range, the temperature information acquisition unit 11 determines the secondary battery temperature β as the secondary battery temperature information (S36), and notifies the weight value selection unit 12 of it.

  For example, when the electronic device 10 is suddenly warmed by an external element unrelated to the electronic device 10 such as a heating device in a car under a hot summer or a heating device such as a stove, the secondary battery 2 is preliminarily heated. The peripheral device 4 of the secondary battery 2 often becomes rapidly hot. Then, the secondary battery 2 is suddenly exposed to a high temperature by the heat radiation due to the temperature of the peripheral device 4, and the possibility that the deterioration of the secondary battery 2 appears clearly increases. The temperature information acquisition unit 11 takes the difference between the secondary battery temperature α and the secondary battery temperature β so that the charging stop unit 14 can stop charging the secondary battery 2 in response to such a situation. When the difference is outside the appropriate range, the temperature information acquisition unit 11 determines the secondary battery temperature β, which is higher than the secondary battery temperature α, as the secondary battery temperature information.

  For example, if the secondary battery temperature sensor 3 fails, the accurate temperature of the secondary battery 2 cannot be measured. At this time, the temperature information acquisition unit 11 acquires the peripheral device temperature information from the peripheral device temperature sensor 5, and indirectly acquires the secondary battery temperature (secondary battery temperature β) with reference to the temperature correlation table 6a. To do. At this time, since the temperature information acquisition unit 11 has not acquired the secondary battery temperature α, the difference between the secondary battery temperature α and the secondary battery temperature β does not fall within the proper range (that is, outside the proper range). Become). Therefore, the temperature information acquisition unit 11 determines the secondary battery temperature β as secondary battery temperature information.

  According to said structure, the temperature information acquisition part 11 acquires peripheral device temperature information from the peripheral device temperature sensor 5, and acquires secondary battery temperature information from peripheral device temperature information with reference to the temperature correlation table 6a. .

  Thereby, the temperature information acquisition part 11 uses the peripheral device temperature sensor 5 and the temperature correlation table 6a, when the secondary battery 2 becomes high temperature by the thermal radiation by the peripheral device 4 of the secondary battery 2, for example. Secondary battery temperature information can be acquired. In addition, when the secondary battery temperature sensor 3 that directly detects the temperature of the secondary battery 2 fails, the temperature information acquisition unit 11 uses the peripheral device temperature sensor 5 and the temperature correlation table 6a to recharge the secondary battery temperature. Information can be acquired.

  Therefore, it is possible to surely avoid the risk that the deterioration of the secondary battery 2 will be clearly manifested. Therefore, deterioration of the secondary battery 2 can be accurately prevented, and the secondary battery 2 can be used for a long time.

[5. Embodiment 3]
Next, another example of the operation of the temperature information acquisition unit 11 will be described in detail with reference to FIG. In the present embodiment, when the secondary battery temperature information is determined from the secondary battery temperature detected by the secondary battery temperature sensor 3 and the peripheral device temperature information detected by the peripheral device temperature sensor 5, S1 in FIG. S2, S31 to S34, and S37 are assumed.

  The temperature information acquisition unit 11 acquires the secondary battery temperature (secondary battery temperature α) directly detected by the secondary battery temperature sensor 3 (S1). On the other hand, the temperature information acquisition unit 11 acquires peripheral device temperature information detected by the peripheral device temperature sensor 5 (S2), refers to the temperature correlation table 6a (S32), and the peripheral device temperature acquired in S2 A secondary battery temperature (secondary battery temperature β) corresponding to the information is acquired (S33).

  Then, the temperature information acquisition unit 11 determines whether or not the secondary battery temperature α is higher than the secondary battery temperature β and the secondary battery temperature α is equal to or higher than a temperature at which the deterioration of the secondary battery 2 is noticeable ( S31). If the secondary battery temperature α is equal to or lower than the secondary battery temperature β, or if the secondary battery temperature α is lower than a temperature at which the deterioration of the secondary battery 2 is noticeable, the temperature information acquisition unit 11 The difference between the secondary battery temperature α and the secondary battery temperature β is taken, and it is determined whether this difference is outside the proper range (S34). Further, if this difference is not outside the appropriate range, the temperature information acquisition unit 11 determines the higher one of the secondary battery temperature α and the secondary battery temperature β as the secondary battery temperature information (S37), and the weighting value. Notify the selection unit 12.

  For example, when a peripheral device 4 such as a CPU or a GPS sensor performs a specific operation regardless of the secondary battery 2, the current in the peripheral device 4 increases and Joule heat increases, and the temperature of the peripheral device 4 increases. May rise. The closer the peripheral device 4 is to the secondary battery 2, the more likely the secondary battery 2 is affected by the heat radiation from the peripheral device 4, resulting in a higher temperature, and the deterioration of the secondary battery 2 may progress. Rise.

  Here, if the peripheral device temperature sensor 5 is installed in the vicinity of the peripheral device 4 that easily causes a temperature change in the secondary battery 2, the temperature information acquisition unit 11 detects the peripheral device temperature detected by the peripheral device temperature sensor 5. The information is converted into a secondary battery temperature (secondary battery temperature β) with reference to the temperature correlation table 6a. Thereby, the temperature information acquisition part 11 not only acquires the secondary battery temperature (secondary battery temperature (alpha)) directly detected by the secondary battery temperature sensor 3, but indirectly secondary battery temperature (secondary battery temperature). β) is obtained. And the temperature information acquisition part 11 compares the secondary battery temperature (secondary battery temperature (alpha)) detected directly with the secondary battery temperature (secondary battery temperature (beta)) obtained indirectly, and is secondary. The higher one of the battery temperature α and the secondary battery temperature β is determined as the secondary battery temperature information. According to said structure, the temperature information acquisition part 11 uses the secondary battery temperature sensor 3, the peripheral device temperature sensor 5, and the temperature correlation table 6a, and deterioration of a secondary battery is so high that the temperature of a secondary battery is high. Since it appears remarkably, higher secondary battery temperature information is acquired. Thereby, the weight value selection unit 12 can select the weight value corresponding to the high temperature acquired by the temperature information acquisition unit 11, and can reliably reduce the risk that the deterioration of the secondary battery 2 is manifested. Can be avoided. Therefore, deterioration of the secondary battery 2 can be accurately prevented, and the secondary battery 2 can be used for a long time.

[Example of software implementation]
The control block (particularly the temperature information acquisition unit 11, the weight value selection unit 12, the weight value integration unit 13, and the charge stop unit 14) of the charge control device 1 is a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. Hardware), or software using a CPU (Central Processing Unit).

  In the latter case, the charging control device 1 includes a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU). Alternatively, a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
The charge control device 1 according to the first aspect of the present invention includes a temperature information acquisition unit (temperature information acquisition unit 11) that acquires secondary battery temperature information indicating the temperature of the secondary battery 2 built in the electronic device 10, and a temperature. Weight value selection means (weight value selection unit 12) for selecting a weight value from secondary battery temperature information acquired by the information acquisition means, and weight value integration means (weight value integration) for integrating the weight values selected by the weight value selection means Unit 13) and charging stopping means (charging stopping part 14) for stopping charging of the secondary battery when the weighted value integrated by the weighting value integrating means becomes equal to or greater than the threshold value.

  According to the above configuration, the weight value selection unit selects the weight value from the secondary battery temperature information acquired by the temperature information acquisition unit, the weight value integration unit integrates the weight value, and the integrated weight value When becomes a threshold value, the charging stop means stops charging the secondary battery. That is, the weighting value is set so that the weighting value increases according to the increase in temperature from the battery temperature at which the deterioration of the secondary battery does not progress so much to the battery temperature at which the deterioration rate becomes significantly high. Is set so as to correspond to a time during which the deterioration rate of the secondary battery is significantly increased. Thereby, the charge stop means can accurately determine the timing at which the deterioration of the secondary battery appears clearly. Therefore, the charging stop means can stop the charging of the secondary battery until the deterioration of the secondary battery is manifested, and can prevent the secondary battery from being deteriorated. Make it possible.

  The charge control device according to aspect 2 of the present invention is the secondary battery temperature acquired by the temperature information acquisition unit with reference to the weighting value table 6b in which the temperature of the secondary battery and the weighting value are associated with each other. You may provide the weight value selection means which selects a weight value from information.

  According to said structure, the suitable weight value matched with the temperature of the secondary battery is obtained by experiment etc. in the weight value table, and the suitable weight value is stored in the weight value table. Thereby, the weight value selection means can select an appropriate weight value from the secondary battery temperature information acquired by the temperature information acquisition means. That is, when the capacity of the secondary battery is high, it is possible to reliably avoid the risk that the deterioration of the secondary battery is clearly manifested. Therefore, the deterioration of the secondary battery can be accurately prevented, and the secondary battery can be used for a long time.

  The charge control device according to aspect 3 of the present invention is the peripheral device that detects the temperature of the peripheral device (peripheral device 4 of the secondary battery) provided around the secondary battery as the peripheral device temperature in the above aspect 1 or 2. Peripheral device temperature information indicating the temperature of the peripheral device is acquired from the temperature sensor 5, and referring to the temperature correlation table 6 a in which the peripheral device temperature and the temperature of the secondary battery are associated with each other, from the peripheral device temperature information You may provide the temperature information acquisition means to acquire secondary battery temperature information.

  According to said structure, a temperature information acquisition means acquires peripheral device temperature information from a peripheral device temperature sensor, acquires a secondary battery temperature information from peripheral device temperature information with reference to a temperature correlation table. Thereby, the temperature information acquisition means, for example, when the secondary battery becomes high temperature due to thermal radiation by the peripheral device of the secondary battery, the secondary battery temperature information is obtained using the peripheral device temperature sensor and the temperature correlation table. You can get it. Further, the temperature information acquisition means can acquire the secondary battery temperature information using the peripheral device temperature sensor and the temperature correlation table when the secondary battery temperature sensor 3 that directly detects the temperature of the secondary battery fails. . Therefore, it is possible to reliably avoid the risk that the deterioration of the secondary battery is clearly manifested. Therefore, the deterioration of the secondary battery can be accurately prevented, and the secondary battery can be used for a long time.

  The electronic device according to aspect 4 of the present invention is a mobile terminal and may be a mobile terminal including the charge control device according to any one of the above aspects 1 to 3.

  According to the above configuration, it is possible to realize a portable terminal that can stop the charging of the secondary battery and prevent the deterioration of the secondary battery until the charging stop means clearly shows the deterioration of the secondary battery. .

  The charge control device according to each aspect of the present invention may be realized by a computer. In this case, the charge control device is realized by the computer by operating the computer as each unit included in the charge control device. A charge control program for the charge control device and a computer-readable recording medium on which the charge control program is recorded also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can be applied to a charge control device, a portable terminal, and a charge control program. In particular, it can be used for a charging control device for controlling charging of a secondary battery built in a portable terminal.

DESCRIPTION OF SYMBOLS 1 Charge control apparatus 2 Secondary battery 3 Secondary battery temperature sensor 4 Peripheral device of secondary battery 5 Peripheral device temperature sensor 6 Memory | storage part 6a Temperature correlation table 6b Weighting value table 10 Electronic device 11 Temperature information acquisition part (Temperature information acquisition means )
12 Weighting value selection unit (weighting value selection means)
13 Weighting value integration unit (weighting value integration means)
14 Charge stop part (Charge stop means)

Claims (5)

Temperature information acquisition means for acquiring secondary battery temperature information indicating the temperature of the secondary battery incorporated in the electronic device;
Weight value selection means for selecting a weight value from the secondary battery temperature information acquired by the temperature information acquisition means;
Weighting value integrating means for integrating the weighting values selected by the weighting value selecting means;
A charge control device comprising: charge stopping means for stopping charging of the secondary battery when the weighted value integrated by the weighted value integrating means exceeds a threshold value.   The weight value selection means refers to a weight value table in which the temperature of the secondary battery is associated with the weight value, and selects the weight value from the secondary battery temperature information acquired by the temperature information acquisition means. The charge control device according to claim 1, wherein   The temperature information acquisition means acquires peripheral device temperature information indicating the temperature of the peripheral device from a peripheral device temperature sensor that detects the temperature of the peripheral device provided around the secondary battery as the peripheral device temperature, and 3. The secondary battery temperature information is obtained from the peripheral device temperature information with reference to a temperature correlation table in which the peripheral device temperature and the secondary battery temperature are associated with each other. Charge control device. The electronic device is a mobile terminal,
A portable terminal comprising the charge control device according to any one of claims 1 to 3.   A charge control program for causing a computer to function as the charge control device according to any one of claims 1 to 3, wherein the charge control program causes the computer to function as each of the means.

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