Power storage system and power storage device storing data for the identifying power storage device

• US 9,577,446 B2
• Filed: 12/12/2013
• Issued: 02/21/2017
• Est. Priority Date: 12/13/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Koyama, Jun
• Primary Examiner(s): Wang, Albert
• Application Number:
  US14/103,883
• Publication Number:
  US 20140173300A1
• Time in Patent Office: 1,167 Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence

Abstract

The versatility of a power feeding device is improved. A power storage system includes a power storage device and a power feeding device. The power storage device includes data for identifying the power storage device. The power storage device includes a power storage unit, a switch that controls whether power from the power feeding device is supplied to the power storage unit, and a control circuit having a function of controlling a conduction state of the switch in accordance with a control signal input from the power feeding device. The power feeding device includes a signal generation circuit having a function of identifying the power storage device by the data input from the power storage device, generating the control signal corresponding to the identified power storage device, and outputting the generated control signal to the power storage device.

Claims

1. A power storage device comprising:

a power receiving circuit;

a data communication circuit;

a power storage unit;

a first transistor between the power receiving circuit and the power storage unit; and

a control circuit electrically connected to a gate of the first transistor and to the power storage unit,

wherein the control circuit includes;

a processor that includes a register and is electrically connected to the gate of the first transistor;

a memory that includes data for identifying the power storage device and is electrically connected to the processor; and

a controller electrically connected to the processor and to the memory,

wherein the register includes;

a first memory circuit configured to hold data in a period during which power is supplied to the processor from the power storage unit; and

a second memory circuit configured to hold data in a period during which supply of the power to the processor from the power storage unit is stopped, the second memory circuit including a second transistor configured to control writing and holding of data.

2. The power storage device according to claim 1, further comprising a protection circuit between the second transistor and the power storage unit,

wherein the protection circuit is electrically connected to the control circuit.

3. The power storage device according to claim 1,

wherein the data for identifying the power storage device includes at least one of data on an average voltage of the power storage device, a capacity of the power storage device, an energy density of the power storage device, a resistance of the power storage device, output power of the power storage device, cycle characteristics of the power storage device, a temperature of the power storage device, an operating temperature range of the power storage device, and an allowable charging current of the power storage device.

6. The power storage device according to claim 1,

wherein an off-state current per micrometer of channel width of the second transistor is lower than or equal to 100 zA.

7. The power storage device according to claim 1,

wherein the second transistor comprises a oxide semiconductor.

8. The power storage device according to claim 7,

wherein the oxide semiconductor comprises at least one of In, Zn and Ga.

9. The power storage device according to claim 1,

wherein an amount of hydrogen of a channel formation region of the second transistor is lower than or equal to 1×

10<sup>−

19</sup>/cm³.

10. The power storage device according to claim 1,

wherein an off-state current per micrometer of channel width of the second transistor is lower than or equal to 100 zA and is greater than or equal to 1×

10<sup>−

30</sup> A.

4. A power storage system comprising a power storage device and a power feeding device,

wherein the power storage device is configured to store data for identifying the power storage device,

wherein the power storage device includes:

a power storage unit;

a switch configured to control whether power from the power feeding device is supplied to the power storage unit;

a control circuit configured to control a conduction state of the switch in accordance with a control signal input from the power feeding device,

a power receiving circuit including a first antenna, and

a data communication circuit including an second antenna and a signal generation circuit,

wherein the power receiving circuit is configured to receive power wirelessly,

wherein the signal generation circuit is configured to generate a response signal in accordance with the inquiry signal from the power feeding device,

wherein the data communication circuit is configured to transmit the response signal to the power feeding device,

wherein the power storage device is configured to input the data into the power feeding device,

wherein the power feeding device is configured to transmit the inquiry signal to the power storage device,

wherein the power feeding device includes a signal processing circuit and a power transmitting circuit,

wherein the signal processing circuit is configured to identify the power storage device based on the data, generate the control signal corresponding to the identified power storage device, and output the control signal to the power storage device,

wherein the power transmitting circuit includes a third antenna,

wherein the power transmitting circuit is configured to start transmitting power to the power storage device when the signal processing circuit determines to charge the power storage device in accordance with the response signal, and

wherein the power transmitting circuit is configured to stop transmitting power to the power storage device when the signal processing circuit determines not to charge the power storage device in accordance with the response signal.

5. The power storage system according to claim 4,

wherein the data for identifying the power storage device includes at least one of data on an average voltage of the power storage device, a capacity of the power storage device, an energy density of the power storage device, a resistance of the power storage device, output power of the power storage device, cycle characteristics of the power storage device, a temperature of the power storage device, an operating temperature range of the power storage device, and an allowable charging current of the power storage device.

11. A power storage system comprising a power storage device and a power feeding device,

wherein the power storage device is configure to store data for identifying the power storage device, and

wherein the power storage device includes:

a power storage unit;

a switch configured to control whether power from the power feeding device is supplied to the power storage unit; and

a control circuit configured to control a conduction state of the switch in accordance with a control signal input from the power feeding device,

wherein the power storage device is configured to input the data into the power feeding device in accordance with an inquiry signal from the power feeding device,

wherein the power storage device is configured to transmit a stop signal to the power feeding device when a voltage of the power storage unit is higher than or equal to a reference voltage,

wherein the power storage device is configured to receive power wirelessly,

wherein the power storage device and the power feeding device are configured to transmit and to receive signal wirelessly each other,

wherein the power feeding device is configured to transmitting power wirelessly,

wherein the power feeding device is configured to transmit the inquiry signal to the power storage device,

wherein the power feeding device includes a signal processing circuit and a power transmitting circuit,

wherein the signal processing circuit is configured to identify the power storage device based on the data,

wherein the signal processing circuit is configured to generate the control signal corresponding to the identified power storage device,

wherein the signal processing circuit is configured to output the control signal to the power storage device,

wherein the power transmitting circuit is configured to start transmitting power to the power storage device when the signal processing circuit determines to charge the power storage device in accordance with the data, and

wherein the power transmitting circuit is configured to stop transmitting power to the power storage device when the signal processing circuit is input with the stop signal.