Abnormal voltage detection apparatus for detecting voltage abnormality in assembled battery

• US 7,557,585 B2
• Filed: 06/20/2005
• Issued: 07/07/2009
• Est. Priority Date: 06/21/2004
• Status: Expired due to Fees

• Current Assignee: Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Original Assignee: Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Inventors: Yudahira, Hirofumi
• Primary Examiner(s): Ullah; Akm E
• Assistant Examiner(s): Muralidar; Richard V
• Application Number:
  US11/157,021
• Publication Number:
  US 20060001403A1
• Time in Patent Office: 1,478 Days
• Field of Search: 324425-433, 324/434, 326/63, 326/83, 327/100, 320/132, 320/148, 320156-159, 320161-164
• US Class Current: 324/433
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An abnormal voltage detection apparatus is provided for an assembled battery including a plurality of battery blocks connected in series to each other. In the abnormal voltage detection apparatus, each of a plurality of signal detectors is provided in each of battery blocks. Each of the signal detectors detects voltage abnormality or normality in each battery block based on a voltage of each battery block, generates an abnormality detecting signal containing information about the detected voltage abnormality or normality, and outputs the abnormality detecting signal. A signal generator generates an abnormality detecting information signal containing information about whether or not any of the battery blocks in the voltage abnormality is present based on the abnormality detecting signals. A transmission device has an input terminal pair and an output terminal pair which are electrically insulated from each other, and transmits the abnormality detecting information signal to an external apparatus.

Claims

1. An abnormal voltage detection apparatus for use in an assembled battery comprising a plurality of battery blocks connected in series to each other, said abnormal voltage detection apparatus detecting voltage abnormality in said assembled battery, each battery block comprising at least one secondary battery, said abnormal voltage detection apparatus comprising:

a plurality of signal detectors each provided in each of said battery blocks, each of said signal detectors;

detecting either one of voltage abnormality and normality of said each battery block based on a voltage of said each battery block,

generating an abnormality detecting signal containing information about either detected one of the voltage abnormality and normality, and

outputting the abnormality detecting signal, wherein said signal detectors simultaneously detect the respective voltages of said battery blocks;

a signal generator connected with the plurality of signal detectors to receive the abnormality detecting signals, the signal generator generating an abnormality detecting information signal containing information about whether or not a voltage abnormality is present in any of said battery blocks based on the abnormality detecting signals; and

a first transmission device directly connected to the abnormality detecting information signal generated by the signal generator, the first transmission device having an input terminal pair and an output terminal pair which are electrically insulated from each other, said first transmission device transmitting the abnormality detecting information signal to an external apparatus, wherein the abnormality detecting information signal turns the first transmission device on when any of said battery blocks has a voltage abnormality and wherein the abnormality detecting information signal turns the first transmission device off when none of the plurality of signal detectors detect voltage abnormality in the battery blocks.

2. The abnormal voltage detection apparatus as claimed in claim 1,

wherein said signal generator calculates a logical sum of the abnormality detecting signals, and generates an abnormality detecting information signal containing a calculated logical sum as information about whether or not any of said battery blocks in the voltage abnormality is present.

3. An abnormal voltage detection apparatus for use in an assembled battery comprising a plurality of battery blocks connected in series to each other, said abnormal voltage detection apparatus detecting voltage abnormality in said assembled battery, each battery block comprising at least one secondary battery, said abnormal voltage detection apparatus comprising:

a plurality of signal detectors connected, one of the plurality of signal detectors provided in each of said battery blocks, each of said signal detectors;

detecting either one of voltage abnormality and normality of said each battery block based on a voltage of said each battery block, wherein voltage abnormality of a particular battery block is detected when the detected voltage of the particular battery block is above a first voltage or below a second voltage lower than the first voltage,

generating an abnormality detecting signal containing information about the voltage abnormality and normality based on the detected voltages of the battery blocks, and

outputting the abnormality detecting signal, wherein said signal detectors simultaneously detect the respective voltages of said battery blocks;

a signal converter connected to the abnormality detecting signal output by the plurality of signal detectors, the signal converter generating and outputting an abnormality detecting information signal containing information about the abnormality detecting signals based on the respective abnormality detecting signals; and

a first transmission device connected to the abnormality detecting information signal, the first transmission device having an input terminal pair and an output terminal pair which are electrically insulated from each other, said first transmission device transmitting the abnormality detecting information signal to an external apparatus, wherein the abnormality detecting information signal controls output levels of the first transmission device.

4. The abnormal voltage detection apparatus as claimed in claim 3,

wherein a plurality of the abnormality detecting signals are parallel signals, and the abnormality detecting information signal is a serial signal, and

wherein said signal converter comprises a parallel-serial converter for converting a plurality of the abnormality detecting signals into the abnormality detecting information signal, and outputting the abnormality detecting information signal, wherein the serial signal identifies which battery block has an abnormal voltage.

5. The abnormal voltage detection apparatus as claimed in claim 4,

wherein said signal converter comprises a level converter provided at a former stage of said parallel-serial converter, said level converter converting a voltage level of each of the abnormality detecting signals into each of converted voltage levels, and outputting the abnormality detecting signals each having the converted voltage level.

6. The abnormal voltage detection apparatus as claimed in claim 5,

wherein the converted voltage levels are substantially the same as each other, and

wherein said level converter converts the voltage level of each of the abnormality detecting signals into each of the converted voltage levels, respectively, by resistance voltage division circuits.

7. The abnormal voltage detection apparatus as claimed in claim 5,

wherein the converted voltage levels are substantially the same as each other, and

wherein said level converter converts the voltage level of each of the abnormality detecting signals into each of the converted voltage levels, respectively, by level converter circuits each including transistors and each utilizing voltage differences each between electrodes of each transistor.

8. The abnormal voltage detection apparatus as claimed in claim 5,

wherein the converted voltage levels are substantially the same as each other, and

wherein said level converter converts the voltage level of at least one of the abnormality detecting signals into each of the converted voltage levels, respectively, by level converter circuits each including transistors and each utilizing voltage differences each between electrodes of each transistor.

9. The abnormal voltage detection apparatus as claimed in claim 8,

wherein each of said level converter circuits lowers the voltage level of the abnormality detecting signal stepwise by a unit voltage, which is a voltage between the terminals of each of said battery blocks, to convert the voltage level thereof into the converted voltage level.

10. The abnormal voltage detection apparatus as claimed in claim 8,

wherein said level converter circuits comprises;

a first level lowering circuit for lowering the voltage level of the abnormality detecting signal for a first battery block of said battery blocks only by a unit voltage, which is a voltage between the terminals of each of said battery blocks, to convert the voltage level thereof into the converted voltage level, and

a second level lowering circuit for lowering the voltage level of the abnormality detecting signal for a second battery block of said battery blocks by a plurality of the unit voltages, to convert the voltage level thereof into the converted voltage level.

11. The abnormal voltage detection apparatus as claimed in claim 10, further comprising:

a third level lowering circuit for lowering the voltage level of the abnormality detecting signal for a third battery block of said battery blocks by the plurality of the unit voltages and then lowering a lowered voltage level thereof by the unit voltage to convert the voltage level thereof into the converted voltage level.

12. The abnormal voltage detection apparatus as claimed in claim 4, further comprising:

a second transmission device having an input terminal pair and an output terminal pair which are electrically insulated from each other, said second transmission device transmitting an output command signal generated by said external apparatus to said parallel-serial converter,

wherein said parallel-serial converter starts generating and outputting of the abnormality detecting information signal in accordance with the output command signal from said second transmission device.