JP6973857B2 - Battery control system, battery device, computer device, battery control method and program - Google Patents

Description

The present invention relates to a battery control system, a battery device, a computer device, a battery control method and a program.

In recent years, battery packs compliant with the smart battery standard have been adopted for electronic devices such as notebook computers. Such a battery pack is composed of an assembled battery using a plurality of battery cells. The battery cell is generally a lithium ion battery or a nickel hydrogen battery. Further, a battery fuel gauge IC for managing the capacity, voltage, current, temperature, etc. of the battery cell is incorporated in the battery pack.

The battery cells constituting the battery pack have high impedance and a large voltage drop in a low temperature environment of 0 ° C. or lower. Therefore, if the battery pack is used at 0 ° C. or lower, the operating time of the battery may be shortened due to the voltage drop, or the system may be shut down. Therefore, the operating temperature of a general notebook computer using such a battery pack is often from 0 ° C.

Some industrial notebook computers are required to be used in low temperature environments of 0 ° C or lower. Notebook computers that can be started at 0 ° C or lower minimize the risk of shutdown by adopting a dedicated battery cell that has good characteristics in a low temperature environment.

In general, electronic devices, especially notebook computers equipped with a hard disk drive, consume a large amount of power at startup. Since the battery is the coldest and the cell temperature is low at the time of starting the device, a large voltage drop will occur when a large amount of power is consumed at the time of starting.

When the battery pack is new, the problem caused by the voltage drop does not occur relatively. However, if the battery pack is used for a long period of time and its characteristics deteriorate, there is a problem that the battery usage time is shortened or shutdown occurs due to the voltage drop at startup.

Therefore, Patent Document 1 of the apparatus discloses a technique of suppressing a voltage drop at the time of starting the apparatus in a low temperature environment. In Patent Document 1, when the temperature of the smart battery at the time of starting the notebook computer is lower than a specific temperature, the constant power control circuit is used every time the voltage drop amount per unit time due to the discharge of the battery cell becomes equal to or less than the threshold value. By turning on the transistors that make up the main board in order, the current supplied to the main board is gradually increased.

Japanese Unexamined Patent Publication No. 2012-98866

In general, a lithium ion battery has an increased reaction resistance in a low temperature environment and a decreased discharge voltage, so that sufficient starting performance may not be obtained. Further, at startup, there is a problem that voltage fluctuation occurs on the electronic device side due to an inrush current, and the operation of the power supply circuit on the electronic device side becomes unstable. In Patent Document 1, in a low temperature environment, the current supplied from the battery to the electronic device is only changed stepwise, and the decrease in the discharge voltage is not taken into consideration.

An object of the present disclosure is a battery control system, a battery device, a computer device, and a battery capable of compensating for a decrease in the discharge voltage in a low temperature environment and stabilizing the operation of a power supply circuit on the electronic device side in view of the above-mentioned problems. The purpose is to provide control methods and programs.

A battery control system according to an aspect of the present invention includes a temperature detector for detecting a cell temperature at startup of an electronic device to which power is supplied from a battery including a plurality of battery cells, and the cell temperature of the battery. An information acquisition unit for acquiring information, a determination unit for determining whether the electronic device can be normally started based on the information of the battery, and a determination unit for determining whether the electronic device cannot be normally started, and when it is determined that the electronic device cannot be started normally, the electronic device It is provided with a control unit that changes the connection state of the plurality of battery cells before starting.

The battery control method according to one aspect of the present invention detects the cell temperature at the time of starting an electronic device to which power is supplied from a battery including a plurality of battery cells, and acquires the information of the battery including the cell temperature. , Based on the information of the battery, it is determined whether the electronic device can be started normally, and if it is determined that the electronic device cannot be started normally, the connection of a plurality of the battery cells before the electronic device is started. Change the state.

The program according to one aspect of the present invention includes temperature detection processing for detecting a cell temperature at startup of an electronic device powered by a battery including a plurality of battery cells, and information on the battery including the cell temperature. The information acquisition process to be acquired, the determination process for determining whether the electronic device can be started normally based on the information of the battery, and the determination process for determining whether the electronic device cannot be started normally, before the electronic device is started. To cause the computer to execute a control process for changing the connection state of the plurality of battery cells.

The battery device according to one aspect of the present invention includes a battery including a plurality of battery cells, a temperature detection unit that detects the cell temperature of the battery cells at the time of starting an electronic device to which power is supplied from the batteries, and the above. A control unit that changes the connection state of a plurality of the battery cells before starting the electronic device according to a determination result of determining whether the electronic device can be normally started based on the information of the battery including the cell temperature. And prepare.

The computer device according to one aspect of the present invention is a computer device in which power is supplied from a battery including a plurality of battery cells, and includes the cell temperature of the battery cells at the time of starting the computer device. The connection state of a plurality of the battery cells before the start of the computer device according to the determination result of determining whether the computer device can be normally started based on the information of the information acquisition unit for acquiring the information and the information of the battery. It is provided with a determination unit for changing.

INDUSTRIAL APPLICABILITY According to the present invention, a battery control system, a battery device, a computer device, a battery control method and a program capable of compensating for a decrease in discharge voltage in a low temperature environment and stabilizing the operation of a power supply circuit on an electronic device side are provided. can do.

It is a figure which shows the structure of the battery control system which concerns on embodiment. It is a figure which shows the configuration example of the battery control system which concerns on embodiment. It is a figure explaining the example which changes the connection state of a battery cell. It is a figure which shows the example of the determination table. It is a figure explaining the example which changes the discharge end voltage. It is a flow diagram explaining the battery control method which concerns on embodiment. It is a figure which shows the other configuration example of the battery control system which concerns on embodiment. It is a figure which shows the discharge characteristic of a lithium ion battery.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In order to clarify the explanation, the following description and drawings are omitted or simplified as appropriate. Further, each element described in the drawing as a functional block for performing various processes can be configured by a CPU, a memory, and other lines in terms of hardware. Further, the present invention can also realize arbitrary processing by causing a CPU (Central Processing Unit) to execute a computer program. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof, and the present invention is not limited to any of them.

In addition, the programs described above can be stored and supplied to a computer using various types of non-transitory computer readable mediums. Non-temporary computer-readable media include various types of tangible storage mediums. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs. Includes CD-R / W, semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The program may also be supplied to the computer by various types of Transitory computer Readable Medium. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The embodiment relates to a control technique for a battery built in an electronic device. The electronic device is powered by a battery having a plurality of battery cells. In the following description, an example in which a lithium ion battery cell is used as the battery cell will be described. FIG. 8 shows the discharge characteristics of a general lithium-ion battery. In FIG. 8, A is 25 ° C., B is 0 ° C., C is −10 ° C., D is −20 ° C., and is a discharge curve when 1C is discharged. From these discharge curves, it can be seen that when the electronic device is used at a temperature of 0 ° C. or lower, not only the discharge capacity decreases but also a voltage drop occurs immediately after the start of discharge. In such a low temperature environment, both the discharge capacity and the discharge voltage are significantly reduced.

Therefore, the embodiment includes the following configuration in order to compensate for the decrease in the discharge voltage in the low temperature environment. As shown in FIG. 1, the battery control system 100 according to the embodiment acquires information on the battery 105 including the cell temperature and the temperature detection unit 101 that detects the cell temperature of the battery 105 at the time of starting the electronic device. The information acquisition unit 102, the determination unit 103 that determines whether the electronic device can be started normally based on the information of the battery 105, and the determination unit 103 that determines whether the electronic device cannot be started normally, a plurality of units before starting the electronic device. A control unit 104 for changing the connection state of the battery cell of the above is provided. This makes it possible to compensate for the discharge voltage in a low temperature environment and stabilize the operation of the power supply circuit on the electronic device side.
Hereinafter, specific examples of the embodiments will be described with reference to the drawings.

FIG. 2 is a diagram showing a configuration example of the battery control system 100 according to the embodiment. The battery control system 100 shown in FIG. 2 employs a notebook computer 10 (computer device) as an example of an electronic device. A battery pack 1 (battery device) is detachably attached to the notebook computer 10. The battery pack 1 is a battery pack compliant with the smart battery standard specified by the SBS-IF (Smart Battery System Implementers Forum). The notebook computer 10 operates by receiving electric power from the battery pack 1. Although not shown here, the notebook computer 10 is connected to an AC (alternating current) adapter via an external power supply terminal, and can be supplied with power from a commercial power supply.

The notebook computer 10 includes a motherboard 11, a battery charger IC 12, a power supply unit 13, an embedded controller (Embedded Controller) 14, and a storage unit 15. A main circuit component (not shown) that constitutes a computer is mounted on the motherboard 11. The battery charger IC 12, the power supply unit 13, the embedded controller 14, and the storage unit 15 are used to control the supply of electric power to the motherboard 11.

The battery pack 1 includes a battery 2, a protection circuit 3, a battery fuel gauge IC (integrated circuit) 4, a control unit 5, and a thermistor 6. The battery 2 is connected to the battery charger IC 12 in the notebook computer 10 via a power supply line. The battery charger IC 12 supplies the electric power from the battery 2 to the motherboard 11 via the power supply unit 13. Further, the battery charger IC 12 charges the battery 2 when necessary.

The embedded controller 14, the battery fuel gauge IC4, and the battery charger IC12 are connected by SMBus (System Management Bus), which is a general-purpose communication bus between devices. The built-in controller 14 and the battery charger IC 12 can read the information of the battery 2 from the battery fuel gauge IC 4 described later via SMBus. The battery charger IC 12 and the built-in controller 14 can always be operated by an auxiliary power source (not shown) such as a button battery. Battery monitoring is performed by exchanging information between the battery pack 1 and the notebook computer 10.

The embedded controller 14 and the motherboard 11 are connected by an LPC (low pin count) 121. Further, the embedded controller 14 is connected to a storage unit 15 that can retain storage even when the power of the Flash ROM or the like is turned off. The storage unit 15 stores firmware, various data, and the like.

As shown in FIG. 3, the battery 2 includes a plurality of battery cells 20 and switches 21 to 24. The switches 21 to 24 change the connection state of the battery cell 20. The terminal voltage of each battery cell 20 is individually input to the protection circuit 3. The protection circuit 3 monitors so that the terminal voltage of each battery cell 20 does not exceed the specified voltage value.

The battery fuel gauge IC4 measures and monitors information such as the degree of deterioration, capacity, voltage, current, and temperature of the battery 2. Further, the battery fuel gauge IC 4 exchanges necessary information with the protection circuit 3. Further, the battery fuel gauge IC 4 is connected to the thermistor 6 that detects the temperature of the battery 2. The thermistor 6 functions to detect the cell temperature of the battery 2 when the notebook computer 10 is started. That is, the thermistor 6 corresponds to the temperature detection unit 101 of FIG.

The embedded controller 14 acquires information on the battery 2 including the cell temperature from the battery fuel gauge IC4. Then, the embedded controller 14 determines whether or not the notebook computer 10 can be normally started based on the acquired information of the battery 2. That is, the embedded controller 14 corresponds to the information acquisition unit 102 and the determination unit 103 in FIG. The determination result by the built-in controller 14 is transmitted to the battery fuel gauge IC4.

The control unit 5 is connected to the battery 2 and the battery fuel gauge IC4. When the embedded controller 14 determines that the notebook computer 10 cannot be started normally, the control unit 5 controls switches 21 to 24 to change the connection state of the battery cell 20 before starting the notebook computer 10. change.

In the example shown in FIG. 3, the battery 2 is provided with eight battery cells 20. The connection state of the battery 2 includes a normal operation mode, a low temperature operation mode, and a normal operation mode. The normal operation mode and the low temperature operation mode are switched according to the determination result based on the information of the battery 2.

In the normal operation mode, the switches 22, 23, and 24 are turned on and the switch 21 is turned off. As a result, two battery cells 20 connected in series are connected in parallel. This connection state is called 4 straight-twin. In the low temperature operation mode, the switches 21 and 24 are turned on and the switches 22 and 23 are turned off. As a result, eight battery cells 20 are connected in series. This connection state is called 8 shifts. That is, in the low temperature operation mode, a voltage higher than the voltage in the normal operation mode is supplied to the notebook computer 10.

The embedded controller 14 can determine whether the notebook computer 10 can be normally started based on the cell temperature and the degree of deterioration. FIG. 4 is a diagram showing an example of a determination table for determining whether or not the notebook computer 10 device can be started normally. In this determination table, the cell temperature, the degree of deterioration, and whether or not the notebook computer 10 can be normally started in that state are stored in association with each other.

In the determination table shown in FIG. 4, whether or not the notebook computer 10 can be started (◯: can be started normally, ×: cannot be started normally) is shown in the two pieces of information of the cell temperature and the degree of deterioration. This determination table is stored in the storage unit 15 in advance. Before starting the notebook computer 10, the control unit 5 refers to the determination table shown in FIG. 4 and determines whether the notebook computer 10 can be normally started.

When it is determined that the notebook computer 10 cannot be started normally, the control unit 5 switches the connection state of the battery cell 20 so that the notebook computer 10 is supplied with a higher voltage than usual. As described above, when the notebook computer 10 is started by using the battery pack 1 in a low temperature environment, a voltage higher than usual can be supplied to the notebook computer 10. As a result, it is possible to prevent a voltage drop from occurring even when a voltage fluctuation occurs due to an inrush current, and it is possible to stably operate the power supply circuit on the notebook computer 10 side.

By the way, the nominal voltage of the lithium ion battery cell is about 3.7V per cell, and the battery cell discharge end voltage for shutting down the system is generally set to about 3.0V. However, referring to the discharge curve D at −20 ° C. in FIG. 8, the voltage may drop below 3.0 V immediately after the start of discharge, and there is a risk that shutdown will occur immediately after the notebook computer 10 starts up. Therefore, in the embodiment, not only the connection state of the battery cell 20 is changed, but also the discharge end voltage of the battery cell 20 is controlled.

FIG. 5 is a diagram illustrating an example of changing the discharge cutoff voltage. As described above, the battery fuel gauge IC4 measures the degree of deterioration of the battery cell 20, the cell voltage, the cell temperature, and the like. These data are read by the embedded controller 14. Normally, the battery fuel gauge IC4 monitors the cell voltage of the battery cell 20 based on the discharge end voltage set from the built-in controller 14. When the cell voltage of the battery cell 20 is lower than the discharge end voltage, the battery fuel gauge IC4 notifies the embedded controller 14 of the discharge end alarm. The embedded controller 14 shuts down the system in response to the discharge end alarm.

Further, the built-in controller 14 can communicate with the battery fuel gauge IC4 to set the voltage value of the discharge end voltage in the battery fuel gauge IC4. In the embodiment, as described above, the embedded controller 14 reads the information on the degree of deterioration of the battery 2 and the cell temperature from the battery fuel gauge IC4, and determines whether the notebook computer 10 can be started normally. .. When the embedded controller 14 determines that the notebook computer 10 cannot be started normally, the discharge end voltage is temporarily invalidated, or the discharge end voltage is set to be lower than the normal time. , Change the setting value. That is, the embedded controller 14 corresponds to the change unit. As a result, in a low temperature environment, the risk of unexpected shut-down at startup can be reduced by temporarily changing the discharge end voltage from the information on the cell temperature and the degree of deterioration.

Next, the battery control method according to the embodiment will be described with reference to FIG. FIG. 6 is a flow chart illustrating the battery control method according to the embodiment. As shown in FIG. 6, first, when the power of the notebook computer 10 device is turned on (step S1), the embedded controller 14 measures the cell temperature and the degree of deterioration from the battery fuel gauge IC4 to the battery fuel gauge IC4. Obtained from (steps S2, S3). Then, the embedded controller 14 reads out the determination table shown in FIG. 4 from the storage unit 15 (step S4).

After that, the embedded controller 14 determines whether or not the notebook computer 10 can be normally started based on the acquired information of the battery 2 using the determination table (step S5). When the notebook computer 10 can be started normally (step S5, YES), the battery pack 1 is in the normal operation mode (step S6). In the normal operation mode, the battery cells 20 are connected in 4 straight-twin engines.

On the other hand, when the notebook computer 10 cannot be started normally (step S5, NO), the battery pack 1 is in the low temperature operation mode (step S7). As described above, in the embodiment, in the low temperature operation mode, not only the connection state of the battery cell 20 is changed, but also the discharge end voltage of the battery cell 20 is controlled. Therefore, in step S7, first, the discharge end voltage is temporarily invalidated, or the discharge end voltage is set so that the discharge end voltage becomes lower than the normal time (step S71). Then, the connection state of the battery cell 20 is changed (step S72). In the low temperature operation mode, the battery cells 20 are directly connected to eight.

As described above, according to the embodiment, it is possible to compensate for the decrease in the discharge voltage in a low temperature environment and stabilize the operation of the power supply circuit on the electronic device side even when the voltage fluctuation due to the inrush current occurs. Become. In addition, by temporarily changing the discharge cutoff voltage, the risk of unexpected shut-down at startup can be reduced. Further, when charging the battery, a general-purpose AC adapter can be used by returning the battery cell connection to the normal connection state, and it is not necessary to prepare a special AC adapter.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. In the above-described embodiment, the example of the notebook computer 10 using the smart battery has been described, but the present invention is not limited thereto. FIG. 7 shows another configuration example of the battery control system according to the embodiment. As shown in FIG. 7, the present invention is effective even when a portable information terminal 10'is adopted as an electronic device and a battery pack 1'which is not a smart battery is used.

The mobile information terminal 10'has a smaller battery capacity than the notebook computer 10, and cannot mount the battery fuel gauge IC4 that consumes electric power in the battery pack 1. In this case, the connection state of the battery cell 20 of the battery 2 can be controlled by using, for example, the power supply control IC 16 on the mobile information terminal 10'side.

Some or all of the above embodiments may also be described, but not limited to:
(Appendix 1)
A temperature detector that detects the cell temperature at startup of an electronic device that is powered by a battery that has multiple battery cells.
An information acquisition unit that acquires information on the battery, including the cell temperature,
Based on the battery information, a determination unit that determines whether the electronic device can be started normally, and
When it is determined that the electronic device cannot be started normally, a control unit that changes the connection state of the plurality of battery cells before starting the electronic device, and a control unit.
To prepare
Battery control system.
(Appendix 2)
The control unit changes the connection state of the plurality of battery cells so that a higher voltage than usual is supplied to the electronic device.
The battery control system according to Appendix 1.
(Appendix 3)
Based on the determination result of the determination unit, the control unit switches the connection state of the plurality of battery cells between the normal operation mode and the low temperature operation mode to activate the electronic device.
In the normal operation mode, a plurality of the battery cells are connected in parallel, and the battery cells are connected in parallel.
In the low temperature operation mode, a plurality of the battery cells are connected in series.
The battery control system according to Appendix 2.
(Appendix 4)
If it is determined that the electronic device cannot be started normally, a change unit for invalidating the discharge end voltage of the battery cell or changing the set value of the discharge end voltage is provided before the electronic device is started. Further prepare
The battery control system according to any one of Supplementary note 1 to 3.
(Appendix 5)
The changing unit changes the set value so that the discharge end voltage becomes lower than in the normal state.
The battery control system according to Appendix 4.
(Appendix 6)
A determination table is provided in which information on the battery and whether or not the electronic device can be normally started by the battery, which is the state of the information, are stored in association with each other.
The determination unit determines whether or not the electronic device can be normally started by referring to the determination table.
The battery control system according to any one of Supplementary note 1 to 5.
(Appendix 7)
The information acquisition unit further acquires the degree of deterioration of the battery.
The battery control system according to any one of Supplementary note 1 to 6.
(Appendix 8)
Detects the cell temperature at startup of an electronic device powered by a battery with multiple battery cells,
Acquire information about the battery, including the cell temperature,
Based on the battery information, it is determined whether the electronic device can be started normally.
When it is determined that the electronic device cannot be started normally, the connection state of the plurality of battery cells is changed before the electronic device is started.
Battery control method.
(Appendix 9)
Temperature detection processing that detects the cell temperature at startup of an electronic device powered by a battery with multiple battery cells,
Information acquisition processing for acquiring information on the battery, including the cell temperature,
Judgment processing for determining whether the electronic device can be normally started based on the battery information, and
When it is determined that the electronic device cannot be started normally, a control process for changing the connection state of a plurality of the battery cells before starting the electronic device, and a control process for changing the connection state of the plurality of battery cells.
Let the computer run
program.
(Appendix 10)
A battery with multiple battery cells and
A temperature detector that detects the cell temperature of the battery cell when the electronic device to which power is supplied from the battery is started.
Control to change the connection state of a plurality of the battery cells before starting the electronic device according to a determination result of determining whether the electronic device can be normally started based on the information of the battery including the cell temperature. Department and
To prepare
Battery device.
(Appendix 11)
A computer device that is powered by a battery that has multiple battery cells.
An information acquisition unit for acquiring information on the battery, including the cell temperature of the battery cell at the time of starting the computer device,
A determination unit that changes the connection state of a plurality of the battery cells before starting the computer device according to the determination result of determining whether the computer device can be normally started based on the information of the battery.
To prepare
Computer equipment.

1, 1'Battery pack 2 Battery 3 Protection circuit 4 Battery fuel gauge IC
5 Control unit 6 Thermistor 10 Notebook computer 10'Mobile information terminal 11 Motherboard 12 Battery charger IC
13 Power supply unit 14 Embedded controller 15 Storage unit 16 Power supply control IC
20 Battery cell 21 to 24 Switch 100 Battery control system 101 Temperature detection unit 102 Information acquisition unit 103 Judgment unit 104 Control unit 105 Battery

Claims (9)

A temperature detector that detects the cell temperature at startup of an electronic device that is powered by a battery that has multiple battery cells.
An information acquisition unit that acquires information on the battery, including the cell temperature and the degree of deterioration of the battery.
A determination unit for determining whether or not the electronic device can be normally started based on the cell temperature and the degree of deterioration.
When it is determined that the electronic device cannot be started normally, the connection state of the plurality of battery cells is changed so that the electronic device is supplied with a higher voltage than usual before the electronic device is started. Control unit and
To prepare
Battery control system. Based on the determination result of the determination unit, the control unit switches the connection state of the plurality of battery cells between the normal operation mode and the low temperature operation mode to activate the electronic device.
In the normal operation mode, a plurality of the battery cells are connected in parallel, and the battery cells are connected in parallel.
In the low temperature operation mode, a plurality of the battery cells are connected in series.
The battery control system according to claim 1. If it is determined that the electronic device cannot be started normally, a change unit for invalidating the discharge end voltage of the battery cell or changing the set value of the discharge end voltage is provided before the electronic device is started. Further prepare
The battery control system according to claim 1 or 2. The changing unit changes the set value so that the discharge end voltage becomes lower than in the normal state.
The battery control system according to claim 3. A determination table is provided in which information on the battery and whether or not the electronic device can be normally started by the battery, which is the state of the information, are stored in association with each other.
The determination unit determines whether or not the electronic device can be normally started by referring to the determination table.
The battery control system according to any one of claims 1 to 4. Detects the cell temperature at startup of an electronic device powered by a battery with multiple battery cells,
Obtaining information on the battery, including the cell temperature and the degree of deterioration of the battery,
Based on the cell temperature and the degree of deterioration, it is determined whether the electronic device can be started normally.
When it is determined that the electronic device cannot be started normally, the connection state of the plurality of battery cells is changed so that the electronic device is supplied with a higher voltage than usual before the electronic device is started. ,
Battery control method. Temperature detection processing that detects the cell temperature at startup of an electronic device powered by a battery with multiple battery cells,
Information acquisition processing for acquiring information on the battery, including the cell temperature and the degree of deterioration of the battery,
Judgment processing for determining whether the electronic device can be started normally based on the cell temperature and the degree of deterioration, and
When it is determined that the electronic device cannot be started normally, the connection state of the plurality of battery cells is changed so that the electronic device is supplied with a higher voltage than usual before the electronic device is started. Control processing and
Let the computer run
program. A battery with multiple battery cells and
A temperature detector that detects the cell temperature of the battery cell when the electronic device to which power is supplied from the battery is started.
Before starting the electronic device, a higher voltage than usual is applied to the electronic device according to the determination result of determining whether the electronic device can be normally started based on the cell temperature and the degree of deterioration of the battery. A control unit that changes the connection state of the plurality of battery cells so as to be supplied, and
To prepare
Battery device. A computer device that is powered by a battery that has multiple battery cells.
An information acquisition unit for acquiring information on the battery, including the cell temperature of the battery cell and the degree of deterioration of the battery when the computer device is started.
Before starting the computer device, a higher voltage than usual is applied to the computer device according to the determination result of determining whether the computer device can be normally started based on the cell temperature and the degree of deterioration of the battery. A determination unit that changes the connection state of the plurality of battery cells so as to be supplied, and
To prepare
Computer equipment.

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