Secondary battery device and vehicle

• US 8,294,426 B2
• Filed: 09/23/2011
• Issued: 10/23/2012
• Est. Priority Date: 03/25/2009
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kosugi, Shinichiro, Miyamoto, Yasuhiro
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US13/241,355
• Publication Number:
  US 20120015222A1
• Time in Patent Office: 396 Days
• Field of Search: 320116-122
• US Class Current: 320/117
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2270/142 acoustic
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

According to one embodiment, a secondary battery device includes a first assembled battery including a plurality of secondary battery cells, a second assembled battery including a plurality of secondary battery cells and connected in series to a low-potential terminal of the first assembled battery, a disconnecting module capable of mechanically switching connection between the first assembled battery and the second assembled battery, a voltage measurement circuit configured to measure voltages of the plurality of secondary battery cells of the second assembled battery, a first power source wiring connected between a high-potential terminal of the second assembled battery and the voltage measurement circuit, a second power source wiring connected between a low-potential terminal of the second assembled battery and the voltage measurement circuit, and a filter connected between the first power source wiring and the second power source wiring.

Claims

1. A secondary battery device comprising:

a first assembled battery including a plurality of secondary battery cells;

a second assembled battery including a plurality of secondary battery cells and connected in series to a low-potential terminal of the first assembled battery;

a disconnecting module capable of mechanically switching connection between the first assembled battery and the second assembled battery;

a voltage measurement circuit configured to measure voltages of said plurality of secondary battery cells of the second assembled battery;

a first wiring connected between a high-potential terminal of the second assembled battery and the voltage measurement circuit;

a second wiring connected between a low-potential terminal of the second assembled battery and the voltage measurement circuit; and

a filter connected between the first wiring and the second wiring and including a first filter and a second filter connected in parallel between the voltage measurement circuit and the second assembled battery,

wherein the second filter is configured to attenuate a signal of frequencies greater than a cutoff frequency, the cutoff frequency is set to be smaller than a peak frequency of the secondary battery cells, and an impedance of the secondary battery cell takes on a maximum value when the frequency is the peak frequency.

2. The secondary battery device of claim 1, wherein the first filter and the second filter are configured to attenuate a signal of a frequency band of several MHz or higher.

3. The secondary battery device of claim 1, wherein the first filter includes a first capacitor configured to short-circuit the first wiring and the second wiring at high frequencies, and

the second filter further includes an inductor connected in series to the first wiring and the second wiring, and a second capacitor configured to short-circuit the first wiring and the second wiring at high frequencies on a side closer to the voltage measurement circuit than the inductor.

4. A secondary battery device of claim 1, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.

5. A secondary battery device of claim 2, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.

6. A secondary battery device of claim 3, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.

8. The secondary battery device of claim 1, wherein the first filter and the second filter are configured to attenuate a signal of a frequency band of several MHz or higher.

11. The vehicle of claim 8, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.

7. A vehicle including a secondary battery device comprising:

a first assembled battery including a plurality of secondary battery cells;

a second assembled battery including a plurality of secondary battery cells and connected in series to a low-potential terminal of the first assembled battery;

a disconnecting module capable of mechanically switching connection between the first assembled battery and the second assembled battery;

a voltage measurement circuit configured to measure voltages of said plurality of secondary battery cells of the second assembled battery;

a first wiring connected between a high-potential terminal of the second assembled battery and the voltage measurement circuit;

a second wiring connected between a low-potential terminal of the second assembled battery and the voltage measurement circuit; and

a filter connected between the first wiring and the second wiring and including a first filter and a second filter connected in parallel between the voltage measurement circuit and the second assembled battery,

wherein the second filter is configured to attenuate a signal of frequencies greater than a cutoff frequency, the cutoff frequency is set so as to be smaller than a peak frequency, and an impedance of the secondary battery cell takes on a maximum value when the frequency is the peak frequency.

9. The vehicle of claim 7, wherein the first filter includes a first capacitor configured to short-circuit the first wiring and the second wiring at high frequencies, and the second filter further includes an inductor connected in series to the first wiring and the second wiring, and a second capacitor configured to short-circuit the first wiring and the second wiring at high frequencies on a side closer to the voltage measurement circuit than the inductor.

10. The vehicle of claim 7, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.

12. The vehicle of claim 9, further comprising:

an equalizing circuit configured to equalize a remaining capacitance of the secondary battery cells;

a transformer configured to transform a voltage supplied from an external power source and output the transformed voltage to the equalizing circuit;

two third wirings connected between the transformer and the equalizing circuit; and

an inductor connected in series to each of the two third wirings, an electric field generated by an electric current flowing through one of the inductors being cut off by the other inductor.