JPS58201269A - Storage battery with temperature sensor - Google Patents

Abstract

PURPOSE:To smoothly transfer heat generating in cathode plates and prevent deformation of a container by heat by using a thermal protector having special detecting temperature and stable ON-OFF operation, and installing a separating wall which devides in two rows the container in parallel with plates. CONSTITUTION:A separating wall 8 which is installed in the center of a container 4 is heated by cathode plates 2 in the outside of an electrode group of a cell 5 placed in both sides separated by the separating wall 8. Only the inner side which is in contact with the electrode group is heated by heat generating from cathode plates 2. The temperature of the inner side is increased than that of outer side container wall c which is in contact with outer atmosphere. A thermal protector 6 having a detecting temperature of 65 deg.C is set in a container wall d which is in contact with the end of the separating wall 8 so as to cross cells 5 arranged in two rows. Thereby, heat conductivity becomes good and detecting of heat becomes sensitive. The maximum temperature is low by 10 deg.C than the deformation temperature of plastic resin of about 70 deg.C. Therefore, expansion and deformation of the container are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage battery equipped with a temperature sensor attached to the main body of the storage battery to detect heat generated during charging.

Normally, lead-acid batteries generate heat when they are charged. In addition, in sealed lead-acid batteries, at the end of charging when the active material used for discharge is fully charged, oxygen gas generated from the anode plate is absorbed by the three-phase interface consisting of the cathode plate surface and the electrolyte. , heat is generated by the reaction that prevents the water content in the electrolyte from decreasing.

This gas absorption reaction is pb + o → PbO161,110119
4,21,(SPbO+ H2SO4→PbSO4+
H2O................................................... (2) Follows the reaction formula shown in (1) and (2) above. The reaction in reaction formula (1) is an exothermic reaction, so if the battery becomes overcharged due to a charging error or a malfunction of the charger, a large amount of heat will be generated, which may cause the battery case to swell or deform. Become. Therefore, a temperature sensor is required to detect such heat and cut off the charging current.

Figure 1 shows the structure of a conventional storage battery with a temperature sensor, in which an anode plate 1 and a cathode plate 2 are separated by a separator 3.
They are placed in a plurality of cells 5 arranged in one row in the battery case 4. A thermal probe as a temperature sensor is installed on the wall of the battery case in contact with the cell 5 in the temperature sensor storage chamber 7 provided adjacent to the cell 5 at the end.

In the above device, the thermal protector 6 is installed at the highest heat generating part of the battery, i.e., not on the battery case wall a where the liquid is directly applied to the cathode plate 2, but in consideration of weight efficiency and volumetric efficiency, as shown in Fig. 1. Since it is attached to the wall of the battery case on the short side of the battery, a thermal protector 6 is attached to the case wall α which is in contact with the cathode plate 2, which is the highest heat generating part that is most susceptible to heat, and senses the temperature. There is a temperature difference of 4 to 6 degrees Celsius between the wall and the wall of the container. Therefore, in order to prevent the battery case from blistering and deformation, use a thermal protector with a lower sensing temperature than a general thermal protector, which has a sensing temperature of 65°C or higher, and measure the temperature of the highest heat generating part of the battery from the material forming the battery case. It was necessary to control the heat deformation temperature of the synthetic resin to be about 70°C or less.

The thermal protector 6 used in this conventional example takes advantage of the fact that the bimetal, which is the main component, curves in response to temperature changes, gives the bimetal a predetermined deviation, and exceeds the predetermined deviation in a certain temperature range. This is a component that interrupts a circuit by bending. Therefore, in order to suppress the sensed temperature to 50° C. or less, which is a sufficient margin with respect to the thermal deformation temperature of the battery case of about 70° C., it is necessary to reduce the deviation given to the bimetal. However, if the deviation is made small, it is difficult to detect the amount of deviation with respect to temperature changes, the ON-OFF operation becomes unstable, and the durability of repeated operations as a current fuse deteriorates.

As described above, it is very difficult to select the operating temperature of a thermal protector used for a lead-acid battery, and it has been difficult to fully demonstrate its characteristics.

Therefore, the present invention uses a thermal protector with a stable 0N-OFF operation at a sensing temperature of 65°C, and provides a partition wall in the battery case that divides the inside of the battery case into two rows parallel to the electrode plates. To provide a storage battery with a temperature sensor that smoothly transfers heat generated from a plate and reliably prevents deformation of a battery case due to heat. Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing the structure of an embodiment of the present invention, in which two adjacent plates 1 made of lead dioxide and three cathode plates 2 made of spongy lead are separated by a cenogulator 3. , the battery case 4 is divided into two rows by a partition wall 8, in which groups of electrode plates are alternately combined.
The cathode plates 2 on both sides of the electrode plate group are installed in the inner cell 5' so that they face the partition wall 8 and the outer wall, respectively. The thermal protector 6 is located in a temperature sensor storage chamber 7 provided adjacent to the end cells 5' divided into two rows by the partition wall 8.
It is installed on the container wall d in contact with the cell 5' so as to straddle the two cells 5' divided around the partition wall 8.

In the above configuration, the partition wall 8 installed at the center of the battery case 4 allows the cells 5' on both sides separated by the partition wall 8 to
Since the cathode plate 2 on the outside of the electrode plate group is heated, the electrode is heated by the heat generated from the cathode plate 2 at the part a in the conventional example in FIG. 1 and the part 0 in the present embodiment in FIG. Only the inner side of the container that is in contact with the plate group is heated, and more heat is accumulated than on the outer wall of the container, which forms an outer wall where the outside is in contact with the outside air, and the temperature rises. Then, 2
Since the thermal protector 6 is installed so as to straddle the cells 5' in the row, heat conduction is extremely good and sensitive heat sensing is possible.

FIG. 3 shows the atmosphere temperature of 25° C. and 1.6° C. in the above embodiment.
A: This is a diagram showing the change in temperature of each part of the battery over time in an overcharged state. The vertical axis is the temperature of the battery case wall (so the horizontal axis is time (minutes). The temperature of the battery wall d that senses the maximum temperature is the highest, and the battery wall d, which forms the outer wall in contact with the cathode plate that has conventionally shown the highest temperature, reaches a temperature of about 5% under the same conditions as a in Figure 1 and C in Figure 2. °C temperature increases.

Therefore, when using a thermal protector with a sensing temperature of 65°C, the maximum temperature of the container wall C in Fig. 2 will be approximately 60°C, which is 10°C lower than the thermal deformation temperature of synthetic resin, approximately 70°C. Blistering and deformation of the battery case will no longer occur.

Furthermore, since the present invention can use a thermal protector with a relatively high sensing temperature of 65°C, the ON-OFF operation is stable without deteriorating the durability of repeated operations as a current fuse. Furthermore, it is also possible to incorporate a temperature sensor inside the battery as a device to detect the heat generation state of the battery and control charging.

As explained above, the present invention sensitively and reliably prevents blistering and deformation of the battery case due to heat, since the temperature of the battery case wall in contact with the partition wall that performs temperature detection is higher than other battery case walls. Furthermore, it has the effect of stabilizing the control operation without deteriorating the durability of a part of the temperature sensor.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a conventional storage battery with a temperature sensor, FIG. 2 is a diagram showing the structure of an embodiment of the present invention, and FIG. 3 is a diagram showing the structure of an embodiment of the present invention.
The figure is a diagram showing changes over time in the temperature rise of each part of the battery in an overcharged state of 1.6 A at an ambient temperature of 25° C. in the above-mentioned example. l...Anode plate, 2...Cathode plate, 3...Separator, 4...
・°・・・・・・Battery case, 5.5'・・・・・・・・・Cell, 6・・・・・・・・・Thermal protector, 7...
...Temperature sensor storage chamber, 8...S...
- Bulkhead. Figure 2 Figure 3 Figure 11 (intermediate)

Claims (2)

[Claims] (1) In a sealed storage battery having a battery case consisting of a plurality of cells adjacent to each other, a partition wall is provided that divides the inside of the battery case into two rows, and a partition wall at the end of the partition wall is provided with a partition wall centered on the partition wall. A storage battery with a temperature sensor, characterized in that a temperature sensor is installed in close contact with two divided cells so as to straddle them, and the partition wall is used as a conductor of heat generated inside the battery. (2) The storage battery with a temperature sensor according to claim (1), characterized in that the temperature sensor is of a resetting type thermal protector type.