JP2000012106A - Temperature detecting device for battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack comprising an overcharge protecting circuit having a simple structure and superior in the practical applicability. SOLUTION: A copper plate 4 is electrically insulatably and heat conductably contacted with a plurality of cells 1-3 adjacent to one another, and a temperature sensor 6 is contacted with the copper plate 4. Whereby a number of cells which can be monitored without increasing the number of expensive temperature sensors, can be increased, and a temperature detecting device of a battery pack superior in the reliability can be economically realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled battery temperature detecting device.

[0002]

2. Description of the Related Art Generally, a temperature sensor for detecting the temperature of an assembled battery is used in an assembled battery used as a battery for an electric vehicle or the like in order to improve safety.

[0003]

However, in a conventional battery pack for electric vehicles, several hundred cells are connected in cascade, but providing a temperature sensor for each cell is expensive. Therefore, several to several + temperature sensors have to be distributed. For this reason, it was not possible to monitor the temperature rise of the unit cell where the temperature sensor is not installed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an assembled battery having an overcharge protection circuit having a simple structure and excellent practicability. It is an object of the present invention to provide an assembled battery temperature detecting device with improved battery temperature monitoring performance.

[0005]

According to the first aspect of the present invention, there is provided a temperature detecting device for an assembled battery according to the present invention, wherein the heat conductive member is in contact with each other so as to be electrically insulable and heat conductive over a plurality of adjacent cells. Is done. Further, a temperature sensor is brought into contact with the heat conducting member. With this configuration, the number of cells that can be monitored can be increased without increasing the number of expensive temperature sensors, so that a highly reliable battery pack temperature detecting device with excellent reliability can be economically realized.

According to a second aspect of the present invention, in the temperature detecting apparatus for an assembled battery according to the first aspect, the heat conductive member may be a film, a tape, or a thin metal heat conductive plate made of an electrically insulating thin material such as a resin. To form a thin coating. It is preferable that the metal heat conductive plate is made of aluminum, copper, or the like. As the electrically insulating thin material, a good heat conductive resin film such as a silicone resin is preferable. The thickness of the electrically insulating thin material may be such that electrical insulation between the unit cells can be performed.

According to a third aspect of the present invention, in the temperature detecting apparatus for an assembled battery according to the second aspect, a heat insulating member having a heat insulating property is further closely attached to the surface of the metal heat conductive plate on the side opposite to the electrically insulating thin material. Therefore, the heat radiation from the metal heat conductive plate to the outside air can be reduced, so that the heat detectability can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus for detecting the temperature of an assembled battery according to the present invention will be specifically described with reference to the following examples.

[0009]

[Embodiment 1] An embodiment of a temperature detecting device for an assembled battery according to the present invention will be described with reference to FIG. FIG. 1 is a schematic perspective view of a temperature detecting device for an assembled battery. Reference numerals 1 to 3 denote cells comprising cylindrical secondary batteries cascaded with each other, and constitute an assembled battery together with other cells not shown. The outer peripheral surface of each of the cells 1 to 3 is formed of a metal can serving as a negative electrode, and has a different potential.

[0010] 4 is a copper plate having a partial cylindrical shape,
This constitutes the metal heat conductive plate referred to in the present invention. Reference numeral 5 denotes a resin thin plate formed in a partially cylindrical shape, which constitutes an electrically insulating thin material according to the present invention. The heat conductive member referred to in the present invention is constituted by the metal heat conductive plate 4 and the electrically insulating thin material 5.

The resin sheet 5 and the copper sheet 4 are formed in substantially the same shape.
-3 are tightly attached to the outer peripheral surface. Thereby, the heat of the cells 1 to 3 is transmitted well to the copper plate 4 through the resin thin plate 5 formed as thin as possible. However, the resin thin plate 5 has a thickness that allows electrical insulation between the copper plate 4 and the cells 1 to 3. The surface of the resin thin plate 5 is coated with heat conductive grease or the like, and the resin thin plate 5 and the cells 1 to 3 or the copper plate 4
Can also reduce the heat transfer resistance.

Reference numeral 6 denotes a temperature sensor such as a thermistor or a PTC, which is bonded to the center of the surface of the copper plate 4 on the side opposite to the thin resin plate 5, and its output signal voltage is supplied to the amplifier, the power supply circuit and the A
It is output to the controller 8 through the pre-circuit unit 7 composed of a / D converter or the like. According to this embodiment, the single temperature sensor 6 can detect abnormal temperatures of the three cells 1 to 3 while suppressing the complexity of the circuit configuration.
Accurate monitoring of abnormal temperature of the assembled battery can be realized. More specifically, when a temperature sensor is provided for each of the cells 1 to 3, not only the addition of the temperature sensor but also the wiring to the temperature sensor and the addition of a front circuit unit such as an amplifier, a power supply circuit, and an A / D converter. Is required, and the circuit configuration becomes extremely complicated.

[0013]

Embodiment 2 Another embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sectional view of the assembled battery temperature detecting device of this embodiment. A copper tape 12 serving as a metal heat conductive plate is adhered to one surface of the polyester tape 11 which is an electrically insulating thin material, and a temperature sensor 13 is provided at a central portion of the main surface of the copper tape 12 on the polyester tape 11 side. Glued. Further, the main surface of the copper tape 12 on the side opposite to the polyester tape 11 is covered with a resin film layer 14 having excellent thin thermal conductivity and electrical insulation.

The temperature detecting device of the assembled battery according to the present embodiment having the above-mentioned structure has flexibility, and an adhesive having heat conductivity is applied to the surface of the resin film layer 14. Not adhered to the outer peripheral surface of each cylindrical battery. In this way, the heat of each cylindrical battery, that is, a unit cell, can be transmitted to the temperature sensor 13 through the resin film layer 14 and the copper tape 12 satisfactorily. It can be prevented well. Further, since the device can be realized only by attaching a plurality of tapes to a plurality of unit cells and further attaching a temperature sensor, the configuration and steps can be simplified.

[0015]

Modification In the above embodiment, a tape-like or thin-plate-like heat conductive member is adhered to the outer peripheral surface of each cylindrical battery. However, it is also possible to use a heat conductive member in which a part or the whole becomes linear. .

[0016]

Modification In the above embodiment, the temperature detecting device is provided on the outer peripheral surface of each cylindrical battery. For example, the hollow core at the center in the radial direction of the cylindrical battery is hollow, and the hollow core is provided with a rod-shaped or cylindrical shape. May be inserted, and a temperature sensor may be bonded to the metal member. However, in this embodiment, the rod-shaped or metal-shaped metal member needs to be electrically insulated from the electrode potential of each cylindrical battery.

[Brief description of the drawings]

FIG. 1 is a perspective view of an assembled battery temperature detecting device according to a first embodiment.

FIG. 2 is a cross-sectional development view of a temperature detector for a battery pack according to a second embodiment.

[Explanation of symbols]

1 to 3 are unit cells, 4 is a copper plate (metal heat conductive plate (heat conductive member)), 5 is a resin thin plate (electrically insulating thin material (heat conductive member)), 6 and 13 are temperature sensors, and 11 is a copper tape ( Metal heat conductive plate), 12 is polyester tape (heat insulation member),
14 is a resin film layer (electrically insulating thin material)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Kobayashi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Co., Ltd. 5H030 AA06 AA09 AS08 FF26

Claims (3)

[Claims] 1. A heat conductive member having good thermal conductivity and in contact with a plurality of cells adjacent to each other so as to be electrically insulable and heat conductive, and a temperature provided in contact with the heat conductive member. And a sensor for detecting the temperature of the assembled battery. 2. The temperature detecting device for an assembled battery according to claim 1, wherein the heat conducting member includes an electrically insulating thin material closely adhered to an outer peripheral surface of the unit cell, and an electrically insulating thin material on an opposite side of the battery. A temperature detecting device for an assembled battery, comprising: a metal heat conductive plate adhered to a surface. 3. A temperature detecting device for an assembled battery according to claim 2, wherein a heat insulating member having a heat insulating property is in close contact with the surface of the metal heat conductive plate on the side opposite to the electrically insulating thin material. Temperature detector.