Battery power source supply with coolant flow

• US 6,344,728 B1
• Filed: 09/30/1999
• Issued: 02/05/2002
• Est. Priority Date: 10/06/1997
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Marukawa, Shuuhei, Watanabe, Koh, Kouzu, Katsumi, Kanamaru, Kunio, Kimura, Tadao, Nakanishi, Toshiaki, Inui, Kiwamu
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US09/319,328
• Time in Patent Office: 859 Days
• Field of Search: 320/112, 320/116, 320/132, 320/150, 320/149, 320/153, 320/161, 320/162, 320/134, 320/FOR.101, 320/FOR.114, 320/FOR.134, 320/FOR.138, 320/FOR.142, 320/DIG.21
• US Class Current: 320/116
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/64 Constructional details of batteries specially adapted for electric vehicles
• CPC Class Codes: B60L 50/66 Arrangements of batteries
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/617 for achieving uniformity or desired distribution of temperature
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/63 Control systems charging or discharging in response to temperature H01M10/44 , H01M10/443; measurement of temperature H01M10/48 , H01M10/486
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/652 characterised by gradients for achieving a desired temperature gradient H01M10/617
• CPC Class Codes: H01M 10/6551 Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
• CPC Class Codes: H01M 10/6557 arranged between the cells
• CPC Class Codes: H01M 10/6563 : with forced flow, e.g. by blowers
• CPC Class Codes: H01M 10/6565 : with recirculation or U-turn in the flow path, i.e. back and forth
• CPC Class Codes: H01M 10/6566 : Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers H01M10/6565 takes precedence
• CPC Class Codes: H01M 2200/10 : Temperature sensitive devices
• CPC Class Codes: H01M 2200/106 : PTC
• CPC Class Codes: H01M 50/213 : adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/50 : Current conducting connections for cells or batteries
• CPC Class Codes: H02J 7/0031 : using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

A power source has a battery pack housing a plurality of interconnected battery modules wherein a plurality of single cells are connected serially. A blower is provided which forces air through the battery pack to maintain the battery modules at a correct temperature. A controller controls the blower in accordance with date provided by sensors which detect voltage, current and temperature. The controller outputs the data and a state of charge. A charging/discharging current circuit includes a relay for interrupting charging and discharging of the battery modules in the event of failure and also includes a rush current prevention resistor and a current sensor. The controller permits the power source to be maintained in a correct operating condition wherein neither overcharging nor undercharging occurs.

Claims

1. A battery power source device comprising:

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

cooling means for forcing coolant to flow within battery pack;

means for voltage detection for detecting voltage at a plurality of positions arranged on said battery pack; and

means for current detection for detecting a charging and a discharging current of the battery pack.

2. The battery power source device according to claim 1 wherein the means for voltage detection comprise means for detecting a total voltage of the battery pack.

3. The battery power source device according to claim 1 wherein the means for voltage detection comprise means for detecting voltage at a single or a plurality of battery modules.

4. A battery power source device comprising:

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

cooling means for forcing coolant to flow within battery pack;

means for voltage detection for detecting voltage at a plurality of positions arranged on said battery pack;

means for current detection for detecting a charging and a discharging current of the battery pack;

means for temperature detection for detecting a temperature of one of a single and a plurality of the battery modules; and

means for determining battery capacity by calculating a SOC using the voltage detected, the current detected and the temperature detected by respective ones of the means for detection.

5. The battery power source device according to claim 4 wherein the means for determining battery capacity are constituted so as to calculate the SOC of a single or a plurality of the battery modules, based on the voltage of a single or a plurality of the battery modules detected by the means for voltage detection, the temperature of a single or a plurality of the battery modules detected by the means for temperature detection, and the current detected by the means for current detection.

6. The battery power source device according to claim 4 wherein the means for determining battery capacity are arranged to calculate the SOC of one of a single and a plurality of the battery modules by looking up the voltage detected, the current detected and the temperature detected in a previously found voltage/current data table corresponding to each battery temperature.

7. The battery power source device according to claim 4 wherein the means for determining battery capacity are arranged to calculate the SOC of one of a single and a plurality of the battery modules by comparing with a voltage/current data table, which was previously found corresponding to each battery temperature, a group of values of the voltage detected and the current detected and the temperature detected of one of a single or a plurality of the battery modules by the means for temperature detection and detecting the voltage and current at prescribed time intervals by the means for detection of voltage and the means for detection of current, and by plotting the detected values of voltage and current at each time point on voltage/current characteristic co-ordinates.

8. The battery power source device according to claim 4 wherein the means for determining battery capacity are arranged to control operation of the cooling means in accordance with the voltage detected the current detected, and the temperature detected by respective ones of the means for detection and in a accordance with the SOC calculated by the means for determining battery capacity.

9. A battery power source device for driving an external device, comprising:

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

said battery pack having positive and negative terminals and means for connection to the external device;

a relay that opens and closes the means for connection of said battery pack to the external device;

said means for connection including means for preventing a rush current in a connection circuit selectively interposed electrically in series with said external device by said relay to reduce an initial current flowing to said external device; and

said means for preventing a current rush including a resistance in the means for connection to said external device and in series with said external device, and a series bypass circuit selectable by said relay for bypassing said resistance.

10. A battery power source device for driving an external device, comprising

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

said battery pack having positive and negative terminals and means for connection to the external device;

a relay that opens and closes the means for connection of said battery pack to the external device;

said means for connection including means for preventing a rush current in a connection circuit selectively interposed electrically in series with said external device by said relay to reduce an initial current flowing to said external device; and

means for series circuit interruption for interrupting at least one location of the series connection of the battery modules that are connected in series.

11. The battery power source device according to claim 10 wherein said means for preventing a current rush includes a resistance in the means for connection to said external device and in series with said external device, and a series bypass circuit selectable by said relay for bypassing said resistance.

12. A battery power source device for powering an external device, comprising:

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said being battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

cooling means for forcing coolant to flow within battery pack;

means for voltage detection for detecting voltage at a plurality of positions arranged on said battery pack;

means for current detection for detecting a charging and a discharging current of the battery pack;

means for temperature detection for detecting a temperature of one of a single and a plurality of the battery modules;

means for determining battery capacity by calculating a SOC using the voltage detected, the current detected and the temperature detected by respective ones of the means for detection;

the battery pack having positive and negative terminals; and

means for connecting the positive and negative terminals of the battery pack to the external device, the means for connecting including a relay that opens and closes the connection with the external device.

13. A battery power source device mounted on an automobile equipped with a motor, a generator, and a vehicle control device for controlling operation of said motor and said generator, said motor being used as a propulsion source, the battery power source device comprising:

a battery pack having battery modules formed by connecting in series electrically and mechanically a plurality of single cells in the form of secondary cells;

said battery modules being held in a holder case in a three-dimensionally parallel arrangement and being electrically connected in series;

said battery pack having positive and negative terminals and means for connection transferring charging and discharging current from and to the battery pack;

cooling means for forcing coolant to flow within battery pack;

means for voltage detection for detecting voltage at a plurality of positions arranged on said battery pack;

means for current detection for detecting a charging and a discharging current of the battery pack;

means for temperature detection that detect temperature at a plurality of positions in said battery pack;

means for determining battery capacity by calculating a SOC using the voltage detected, the current detected and the temperature detected by respective ones of the means for detection;

means for transmitting a battery condition that outputs operational condition data of the battery pack to the vehicle control device of said automobile; and

a relay for opening and closing a circuit connecting said battery pack to said motor and said generator of the automobile.

14. The battery power source device according to claim 13 wherein the means for transmitting battery condition outputs to the vehicle control device a failure condition of the battery pack detected by the means for detection.

15. The battery power source device according to claim 13 wherein the relay is arranged to interrupt the connection circuit of the battery pack to the motor and the generator of the automobile in response to the vehicle control device in event of failure.

16. A battery power source device comprising:

a battery pack having battery modules that are interconnected;

a holding casing containing said battery modules;

cooling means for forcing coolant to flow through said holding case and around said battery modules to effect cooling of said battery modules;

a voltage detector detecting a voltage across a pair of positions of said interconnected battery modules; and

a current detector detecting current flow of said battery pack.

17. The battery power source device according to claim 16 wherein said voltage detector detects a total voltage of said battery pack.

18. The battery power source device according to claim 16 wherein said voltage detector detects voltages across a plurality of pairs of positions of said battery modules.

19. The battery power source device according to claim 16 further comprising:

a temperature detector for detecting a temperature at at least one of said battery modules; and

means for determining battery capacity by calculating a state of charge of said battery modules using said voltage detected, said current detected and said temperature detected by respective ones of said voltage detector, said current detector, and said temperature detector.

20. The battery power source device according to claim 19 wherein said voltage detector detects a total voltage of said battery pack.

21. The battery power source device according to claim 19 wherein said voltage detector detects voltages across a plurality of pairs of positions of said battery modules.

22. The battery power source device according to claim 21 wherein said means for determining battery capacity calculates said state of charge of a plurality of said battery modules further based on said voltage detected across said plurality of pairs of positions of said battery modules.

23. The battery power source device according to claim 22 wherein:

said temperature detector detects temperatures at a plurality of said battery modules; and

said means for determining battery capacity calculates said state of charge of said plurality of said battery modules further based on said temperatures detected at said plurality of said battery modules.

24. The battery power source device according to claim 23 wherein said plurality of said battery modules for which said state of charge is calculated is different from said plurality of said battery modules for which said temperatures are detected.

25. The battery power source device according to claim 16 further comprising:

a temperature detector for detecting a temperature at a plurality of said battery modules; and

means for determining battery capacity by calculating a state of charge of a plurality of said battery modules using said voltage detected, said current detected and said temperatures detected by respective ones of said voltage detector, said current detector, and said temperature detector.

26. The battery power source device according to claim 25 wherein said plurality of said battery modules for which said state of charge is calculated is different from said plurality of said battery modules for which said temperatures are detected.

27. A battery power source device for driving an external device, comprising:

a battery pack having battery modules that are interconnected;

a holding casing containing said battery modules;

said battery pack having positive and negative terminals and means for connection to the external device;

a relay that opens and closes said means for connection of said battery pack to the external device; and

means for preventing a current rush including a resistance in the means for connection to said external device and in series with said external device, and a series bypass circuit selectable by said relay for bypassing said resistance.

28. A battery power source device for driving an external device, comprising:

a battery pack having battery modules that are interconnected;

a holding casing containing said battery modules;

said battery pack having positive and negative terminals and means for connection to the external device;

a relay that opens and closes said means for connection of said battery pack to the external device;

cooling means for forcing coolant to flow through said holding case and around said battery modules to effect cooling of said battery modules;

a voltage detector detecting a voltage across a pair of positions of said interconnected battery modules; and

a current detector detecting current flow of said battery pack.

29. The battery power source device according to claim 28 wherein said means for connection includes means for preventing a rush current in a connection circuit selectively interposed electrically in series with said external device by said relay to reduce an initial current flowing to said external device.

30. A battery power source device for driving an external device, comprising:

a battery pack having battery modules that are interconnected;

a holding casing containing said battery modules;

said battery pack having positive and negative terminals and means for connection to the external device;

a relay that opens and closes said means for connection of said battery pack to the external device;

a series connection of said battery modules; and

means for series circuit interruption for interrupting at least one location of said series connection of said battery modules.

31. The battery power source device according to claim 30 wherein said means for connection includes means for preventing a current rush including a resistance in the means for connection to said external device and in series with said external device, and a series bypass circuit selectable by said relay for bypassing said resistance.

32. A battery power source device for powering an external device having an external device controller, comprising:

a battery pack having battery modules that are interconnected;

a holding casing containing said battery modules;

cooling means for forcing coolant to flow through said holding case and around said battery modules to effect cooling of said battery modules;

a voltage detector detecting a voltage across a pair of positions of said interconnected battery modules;

a current detector detecting current flow of said battery pack;

a temperature detector for detecting a temperature at at least one of said battery modules;

means for determining battery capacity by calculating a state of charge of said battery modules using said voltage detected, said current detected and said temperature detected by respective ones of said voltage detector, said current detector, and said temperature detector;

means for connecting power output of said battery pack to the external device, said means for connecting including a relay that opens and closes said connection with the external device;

means for transmitting data, including said battery capacity of said battery pack, from said means for determining to the external device controller; and

a relay, responsive to said external device controller, for opening and closing said connection of said battery pack to said external device.

33. The battery power source device according to claim 32 wherein said means for transmitting battery condition outputs to the external device controller a failure condition of said battery pack determined by said means for determining.

34. The battery power source device according to claim 33 wherein said relay is arranged to interrupt said connection of said battery pack to the external device in response to the external device controller when said failure condition is transmitted.