JP2022183420A - Charge management device, electronic apparatus and charge management method - Google Patents

Abstract

To provide a charge management device capable of suppressing degradation of a secondary battery when a state of connecting to a charger continues.SOLUTION: A charge management device can connect to a charger and a secondary battery and comprises a time measurement section which measures the time when connection of the charge management device with the charger continues and a power supply control section which charges the secondary battery with charge power supplied by the charger and makes the state of charge of the second battery reach that of a charging end stage, and the power supply control section, after the time point when the time reaches a set time, supplies discharge power discharged by the secondary battery to a load and determines whether or not the state of charge lowers to a specific state of charge lower than that of the charging end stage and after the time point when the state of charge lowers to the specific state of charge, stops to supply the discharge power to the load and supplies power supplied by the charger to the load.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a charging management device, an electronic device, and a charging management method.

Patent Literature 1 discloses a technique for controlling discharge according to the voltage of an assembled battery composed of a plurality of unit cells connected in series. In Patent Document 2, when the charging of the lithium ion battery is stopped, the voltage between the charging terminals of the device equipped with the lithium ion battery is measured. A technique for charging a lithium-ion battery when the battery is charged is disclosed.

JP 2011-249237 A JP 2019-110627 A

In the technique disclosed in Patent Document 1, the secondary battery may deteriorate due to repeated discharge according to the voltage of the secondary battery. In the technology disclosed in Patent Literature 2, when an electronic device including a secondary battery and a charger continue to be connected, the charging of the secondary battery and the charging of the secondary battery are performed in order to maintain the voltage of the secondary battery at the set voltage. discharge is repeated. Therefore, in the technique disclosed in Patent Document 2, when the electronic device including the secondary battery and the charger continue to be connected, charging and discharging of the secondary battery are repeated, thereby causing the secondary battery to be discharged. There is a risk of deterioration. An object of one aspect of the present disclosure is to provide a charging management device, an electronic device, and a charging management method that can suppress deterioration of a secondary battery when a state of being connected to a charger continues.

A charging management device according to an aspect of the present disclosure is a charging management device that can be connected to a charger and a secondary battery, and measures the time during which the connection between the charging management device and the charger continues. a time measurement unit; and a power supply control unit that charges the secondary battery with charging power supplied from the charger and causes the secondary battery to reach the end of charge, wherein the power supply control unit determines whether or not the state of charge has decreased to a specific state of charge lower than the end of charge by supplying the discharge power discharged by the secondary battery to the load after the time reaches the set time. After the state of charge drops to the specific state of charge, supply of the discharged power to the load is stopped, and the power supplied by the charger is supplied to the load.

An electronic device according to an aspect of the present disclosure includes a charging management device connectable to a charger and a secondary battery. The charging management device includes a time measuring unit that measures the duration of connection between the charging management device and the charger, and a charging power supplied from the charger to charge the secondary battery and a power supply control unit that causes the state of charge of the secondary battery to reach the end of charging, wherein the power supply control unit controls the discharge power discharged by the secondary battery after the time reaches the set time. is supplied to the load to determine whether the state of charge has decreased to a specific state of charge that is lower than the end of charge, and the discharged power is supplied to the load after the state of charge has decreased to the specific state of charge. supply is stopped and the power supplied by the charger is supplied to the load.

A charging management method according to an aspect of the present disclosure includes steps of measuring a time during which a charging management device connectable to a charger and a secondary battery and the charger continue to be connected; a step of charging the secondary battery with the supplied charging power to bring the state of charge of the secondary battery to the end of charging; and discharging discharged by the secondary battery after the time reaches a set time. a step of determining whether or not the state of charge is lowered to a specific state of charge lower than the end of charge by supplying electric power to a load; is stopped from being supplied to the load and the power supplied by the charger is supplied to the load.

It is a figure which shows an example of a structure of an electronic device. 4 is a flowchart showing an example of processing executed by an electronic device; FIG. 4 is a diagram showing an example of time transition of the state of charge of a secondary battery; It is a figure which shows an example of a structure of a charge management system.

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 to 3. FIG. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a diagram showing an example of the configuration of an electronic device 100. As shown in FIG. As illustrated in FIG. 1 , electronic device 100 includes secondary battery 101 , load 102 , and charge management device 103 . Electronic devices include smartphones, notebook PCs (Personal Computers), tablet terminals, and the like. Electronic device 100 is connectable to charger 111 .

A secondary battery 101 is a rechargeable battery that drives the electronic device 100 . For example, the secondary battery 101 is a lithium ion battery. Secondary battery 101 may be a secondary battery other than a lithium ion battery.

The load 102 includes system processing circuitry 104 . The system processing circuit 104 performs processing for realizing the functions of the electronic device 100 . The system processing circuit 104 includes a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like. The system processing circuit 104 may also control display processing on a liquid crystal display or the like included in the electronic device 100 .

The charging management device 103 can be connected to the charger 111 and the secondary battery 101 and controls power supply to the secondary battery 101 and the load 102 . For example, the charge management device 103 is implemented by a switching device, a voltage step-up/step-down circuit, and a control circuit such as a microcomputer or CPU.

Charging management device 103 includes charger connection unit 105 , connection detection unit 106 , time measurement unit 107 , and power supply control unit 108 . Charger connection unit 105 is an interface for connecting charger 111 to charge management device 103 . Connection detection unit 106 detects connection between charging management device 103 and charger 111 . The time measuring unit 107 measures the time during which the connection between the charging management device 103 and the charger 111 continues. The power supply control unit 108 controls power supply to the secondary battery 101 and the load 102 .

FIG. 2 is a flowchart illustrating an example of processing executed by electronic device 100 . FIG. 3 is a diagram showing an example of temporal transition of the state of charge (SOC) of the secondary battery 101. As shown in FIG. It is assumed that the charger 111 is connected to the power supply when the electronic device 100 starts the process of step S201 illustrated in FIG. Furthermore, in this example, it is assumed that the state of charge of the secondary battery 101 is lower than the end of charge when the electronic device 100 starts the process of step S201. In other words, it is assumed that the secondary battery 101 is not in a fully charged state when the electronic device 100 starts the process of step S201.

In step S<b>201 , the connection detection unit 106 determines whether connection between the charging management device 103 and the charger 111 has been detected. For example, the connection detection unit 106 detects that the charger connection unit 105 and the charger 111 are connected and a voltage is applied to the power supply control unit 108, whereby the charge management device 103 and the charger 111 are connected. connections may be detected. Alternatively, if charger connection unit 105 includes a lock mechanism for fitting electronic device 100 and charger 111 together, connection detection unit 106 detects that the lock mechanism operates and electronic device 100 and charger 111 are fitted together. The connection between the charge management device 103 and the charger 111 may be detected by detecting the combination. The connection detection unit 106 only needs to be able to detect connection between the charging management device 103 and the charger 111, and the details of the method for detecting connection between the charging management device 103 and the charger 111 are not limited.

If connection detection unit 106 does not detect connection between charging management device 103 and charger 111 in step S201, charging management device 103 returns the process to step S201. In other words, connection detection unit 106 repeats the process of step S201 before time t300 at which connection between charge management device 103 and charger 111 is detected. On the other hand, when the connection detection unit 106 detects connection between the charging management device 103 and the charger 111 in step S201, the time measurement unit 107 starts measuring time in step S202. In other words, the time measuring unit 107 starts measuring time in response to the charger 111 being connected to the charge management device 103 . In this example, after the connection detection unit 106 detects the connection between the charging management device 103 and the charger 111, the connection between the charging management device 103 and the charger 111 is continued until the process of step S212 is executed. and

In step S<b>203 , the power supply control unit 108 starts charging the secondary battery 101 by supplying the charging power 121 from the charger 111 to the secondary battery 101 . For example, when a switching device such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor) is provided in the current path between the charger connection unit 105 and the secondary battery 101, the power supply control unit 108 A current path between the charger connection unit 105 and the secondary battery 101 is conducted by the switching device, and the secondary battery 101 is charged with charging power 121 supplied from the charger 111 .

In step S204, the power supply control unit 108 determines whether the charging state of the secondary battery 101 has reached the end of charging. That is, the power supply control unit 108 determines whether or not the secondary battery 101 has reached the fully charged state.

If the state of charge of the secondary battery 101 has not reached the end of charging in step S204, the charge management device 103 returns the process to step S203. That is, the power supply control unit 108 charges the secondary battery 101 with the charging power 121 supplied from the charger 111 when the state of charge of the secondary battery 101 reaches the end of charging before time t301. As a result, the power supply control unit 108 charges the secondary battery 101 with the charging power 121 supplied from the charger 111 so that the secondary battery 101 reaches the end of charging. That is, the power supply control unit 108 charges the secondary battery 101 to a fully charged state with the charging power 121 supplied from the charger 111 .

On the other hand, when the state of charge of the secondary battery 101 reaches the end of charging in step S204, the power supply control unit 108 stops supplying the charging power 121 from the charger 111 to the secondary battery 101 in step S205. For example, when a switching device is provided between the charger connection unit 105 and the secondary battery 101, the power supply control unit 108 interrupts the current path between the charger connection unit 105 and the secondary battery 101 by the switching device. , the supply of the charging power 121 from the charger 111 to the secondary battery 101 is stopped.

In step S<b>206 , the power supply control unit 108 supplies the power 122 from the charger 111 to the load 102 . For example, when a switching device is provided between the charger connection unit 105 and the load 102 , the power supply control unit 108 conducts the current path between the charger connection unit 105 and the load 102 by the switching device, supplies power 122 supplied by to the load 102 . Then, the power supply control unit 108 causes the system processing circuit 104 to perform processing for realizing the functions of the electronic device 100 using the power 122 .

By executing the processing from step S205 to step S206 by the charge management device 103, overcharging of the secondary battery 101 can be suppressed, and deterioration of the secondary battery 101 due to overcharging can be suppressed. Furthermore, the charge management device 103 executes the processing from step S205 to step S206, thereby preventing the secondary battery 101 from being charged or discharged, suppressing a decrease in the state of charge of the secondary battery 101, and allowing the system processing circuit 104 to performs processing for realizing the functions of the electronic device 100 .

In step S<b>207 , the power supply control unit 108 determines whether or not the set time has passed since the time measurement unit 107 started measuring time. That is, in step S207, the power supply control unit 108 determines whether or not the set time has passed since the electronic device 100 and the charger 111 were connected. For example, the set time is a time during which deterioration of the secondary battery 101 can be suppressed when the charging state of the secondary battery 101 is the end of charging. For example, if the time required for the state of charge of the secondary battery 101 to reach the end of charge from the end of discharge is two hours, the set time is one day.

In step S207, if the set time has not elapsed since the time measuring unit 107 started measuring the time, the charging management device 103 returns the process to step S206. In other words, the power supply control unit 108 determines that the time during which the connection between the charging management device 103 and the charger 111 continues after the time t301 when the charging state of the secondary battery 101 reaches the end of charging is within the set time. If it is before time t302, the power 122 is supplied from the charger 111 to the load 102 by the process of step S206.

On the other hand, if the set time has elapsed since the time measurement unit 107 started measuring the time in step S207, the power supply control unit 108 stops supplying the power 122 from the charger 111 to the load 102 in step S208. do. That is, when the time during which the connection between the charging management device 103 and the charger 111 continues is after time t302 when the set time is reached, the power supply control unit 108 supplies the power 122 from the charger 111 to the load 102. stop doing For example, when a switching device is provided in the current path between the charger connection unit 105 and the load 102, the power supply control unit 108 cuts off the current path between the charger connection unit 105 and the load 102 by the switching device, The supply of power 122 from charger 111 to load 102 is stopped.

In step S<b>209 , the power supply control unit 108 supplies the discharge power 123 from the secondary battery 101 to the load 102 . For example, when a switching device is provided in the current path between the secondary battery 101 and the load 102 , the power supply control unit 108 conducts the current path between the secondary battery 101 and the load 102 with the switching device. Accordingly, the power supply control unit 108 supplies the discharge power 123 from the secondary battery 101 to the load 102 and causes the system processing circuit 104 to perform processing for realizing the functions of the electronic device 100 .

The charge management device 103 executes the processes from step S208 to step S209, thereby suppressing deterioration of the secondary battery 101 due to the end-of-charge state of the secondary battery 101 being maintained for a long time. A state in which power is supplied to the load 102 can be maintained. Furthermore, when the state of charge of the secondary battery 101 is the end of charging, the charge management device 103 suppresses the deterioration of the state of charge of the secondary battery 101 for a time that can suppress the deterioration of the secondary battery 101, thereby preventing the state of charge of the secondary battery 101 from decreasing. It is possible to suppress a decrease in the convenience of the electronic device 100 due to a decrease in .

In step S210, the power supply control unit 108 determines whether or not the state of charge of the secondary battery 101 has decreased to a specific state of charge that is lower than the end of charge. That is, the power supply control unit 108 supplies the discharge power 123 discharged by the secondary battery 101 to the load 102 after time t302 when the time measured by the time measurement unit 107 reaches the set time, and It is determined whether or not the state of charge has decreased to a specific state of charge that is lower than the end of charge. For example, the specific state of charge is a state in which battery deterioration does not progress easily even if the secondary battery 101 is maintained at a constant voltage for a long time. In step S210, the power supply control unit 108 may determine that the voltage of the secondary battery 101 has dropped below a predetermined threshold as that the state of charge of the secondary battery 101 has dropped to a specific state of charge. .

If the state of charge of the secondary battery 101 has not decreased to the specific state of charge in step S210, the charge management device 103 returns the process to step S209. In other words, supply of discharged power 123 from secondary battery 101 to load 102 continues until the state of charge of secondary battery 101 decreases to the specific state of charge.

On the other hand, when the state of charge of the secondary battery 101 drops to the specific state of charge in step S210, the power supply control unit 108 stops supplying the discharge power 123 from the secondary battery 101 to the load 102 in step S211. For example, when a switching device is provided in the current path between the secondary battery 101 and the load 102, the power supply control unit 108 cuts off the current path between the secondary battery 101 and the load 102 by the switching device, The supply of discharge power 123 from battery 101 to load 102 is stopped.

In step S<b>212 , the power supply control unit 108 supplies the power 122 from the charger 111 to the load 102 . In other words, the power supply control unit 108 stops supplying the discharge power 123 to the load 102 after time t303 when the state of charge of the secondary battery 101 has decreased to the specific state of charge, and 122 to load 102 . For example, when a switching device is provided in the current path between the charger connection unit 105 and the load 102, the power supply control unit 108 conducts the current path between the charger connection unit 105 and the load 102 by the switching device, Electric power 122 is supplied from the charger 111 to the load 102 . Then, the power supply control unit 108 causes the system processing circuit 104 to perform processing for realizing the functions of the electronic device 100 using the power 122 .

Power supply control unit 108 continues to supply power 122 from charger 111 to load 102 until electronic device 100 and charger 111 are disconnected. Therefore, the charge management device 103 executes the processing from step S211 to step S212 to maintain the specific state of charge and prevent the state of charge of the secondary battery 101 from decreasing without charging or discharging the secondary battery 101. Electric power 122 can be supplied from the charger 111 to the load 102 while suppressing power consumption, and the system processing circuit 104 can perform processing for realizing the functions of the electronic device 100 . Furthermore, the charge management device 103 can suppress charging and discharging of the secondary battery 101 by executing the processes from step S211 to step S212, and can suppress deterioration of the secondary battery 101 due to charging and discharging.

As described above, even when the electronic device 100 is connected to the charger 111 for a long time, the charging and discharging of the secondary battery 101 is suppressed, and the state of charge is maintained lower than that at the end of charging. , the deterioration of the secondary battery 101 can be suppressed.

(Modification 1) As a modification 1 of the charging management device 103 according to the present embodiment, the time measurement unit 107 measures time in response to the state of charge of the secondary battery 101 reaching the end of charging. may be started. In this case, in step S207, the power supply control unit 108 determines whether or not the set time has elapsed since the measurement of time was started in response to the charging state of the secondary battery 101 reaching the end of charging. judge. That is, the power supply control unit 108 does not charge or discharge the secondary battery 101 for the set time after the state of charge of the secondary battery 101 reaches the end of charging, thereby suppressing the deterioration of the state of charge of the secondary battery 101. while supplying power 122 from the charger 111 to the load 102 . As a result, in the first modification, the charging management device 103 can set the secondary battery 101 to the set time after starting to measure the time in response to the charge state of the secondary battery 101 reaching the end of charging. By suppressing the deterioration of the state of charge of the electronic device 101, the deterioration of the convenience of the electronic device 100 can be suppressed.

(Second embodiment)
A second embodiment will be described with reference to FIG. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted. Configurations and processes having substantially the same functions as those of the first embodiment will be referred to by common reference numerals, description thereof will be omitted, and differences from the first embodiment will be described.

FIG. 4 is a diagram showing an example of the configuration of a charging management system 400 according to this embodiment. Charging management system 400 includes charging management device 401 , secondary battery 402 , load 403 , and charger 404 . The charge management device 401, the secondary battery 402, and the charger 404 are the same as the charge management device 103, the secondary battery 101, and the charger 111, respectively, illustrated in FIG. 1, and detailed description thereof will be omitted. Furthermore, the functional configuration of the charging management device 401 is the same as that of the charging management device 103 illustrated in FIG. 1, and detailed description thereof will be omitted. However, in the second embodiment, unlike the first embodiment, the charging management device 401 and the load 403 may be different devices, and the load 403 may constitute a device other than the electronic device.

Charging management device 401 is connectable to charger 404 and secondary battery 402 . Further, charging management device 401 connects to load 403 . For example, charging management device 401 is realized by a computer having a CPU. Charger 404 supplies charging power 411 to secondary battery 402 . The load 403 may be a circuit or the like that operates with the power 412 supplied from the charger 404 and the discharged power 413 supplied from the secondary battery 402, and the details thereof are not limited.

Similarly to the charge management device 103 according to the first embodiment, the charge management device 401 suppresses the charging and discharging of the secondary battery 101 while maintaining the state of charge lower than the end of charge. Deterioration can be suppressed. Furthermore, like the charging management device 103 according to the first embodiment, the charging management device 401 can cause the load 403 to operate while suppressing deterioration of the secondary battery 402 .

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

REFERENCE SIGNS LIST 100 electronic device 101 secondary battery 102 load 103 charge management device 104 system processing circuit 105 charger connection unit 106 connection detection unit 107 time measurement unit 108 power supply control unit 111 charger 121 charge Power 122 Power 123 Discharge Power 400 Charge Management System 401 Charge Management Device 402 Secondary Battery 403 Load 404 Charger 411 Charge Power 412 Power 413 Discharge Power

Claims (7)

A charging management device connectable to a charger and a secondary battery,
a time measuring unit that measures the time during which the connection between the charging management device and the charger continues;
a power supply control unit that charges the secondary battery with charging power supplied from the charger and causes the secondary battery to reach the end of charging;
with
The power supply control unit
After the time reaches the set time, supplying the discharge power discharged by the secondary battery to the load and determining whether the state of charge has decreased to a specific state of charge lower than the end of charge,
After the state of charge has decreased to the specific state of charge, the charge management device stops supplying the discharge power to the load and supplies the power supplied by the charger to the load. The power supply control unit supplies the power to the load after the state of charge reaches the end of charging and before starting to supply the discharged power to the load. Item 1. The charging management device according to item 1. The power supply control unit detects that the voltage of the secondary battery has decreased below a predetermined threshold after the time reaches the set time, and that the state of charge has decreased to the specific state of charge. The charging management device according to claim 1 or 2, wherein the determination is as follows. The charging management device according to any one of claims 1 to 3, wherein measuring the time is started in response to connecting the charger to the charging management device. An electronic device comprising the charge management device according to any one of claims 1 to 4. 6. The electronic device according to claim 5, wherein said load comprises a system processing circuit that performs processing for realizing functions of said electronic device. a step of measuring the time during which the charging management device connectable to the charger and the secondary battery continues to be connected to the charger;
a step of charging the secondary battery with the charging power supplied from the charger to bring the state of charge of the secondary battery to the end of charging;
After the time reaches the set time, it is determined whether the discharged power discharged by the secondary battery is supplied to the load and the state of charge is lowered to a specific state of charge lower than the end of charge. process and
a step of stopping the supply of the discharged power to the load after the state of charge has decreased to the specific state of charge, and supplying the power supplied by the charger to the load;
charging management methods including;

Images