JP2000003732A - Deteriorated battery detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deteriorated battery detecting device capable of surely and easily and inexpensively detecting a deteriorated battery in a set battery. SOLUTION: This device is a detecting device for a set battery, formed by connecting multiple mono block batteries 2 in series or in parallel with each other. In this case, at least one temperature detecting sensor 1 is installed on a cover or a battery jar wall of each battery, and when a temperature detected by the temperature detecting sensor 1 exceeds the preset value or the preset value of the mean value of all detected temperature, a processing device 3 issues an abnormality alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a deteriorated battery of an assembled battery which is used as a high-voltage power source by connecting a number of batteries to a series, such as an electric vehicle, a transport vehicle, an AGV, and the like. It is.

[0002]

2. Description of the Related Art A large number of batteries are connected to a series, such as for electric vehicles, transport vehicles, and AGVs. A battery used as a high-voltage power supply is a liquid battery that requires water refilling and a sealed that does not require water refilling. There is a battery.

[0003] In the case of a liquid-type battery, when charge and discharge are repeated, water in the electrolytic solution is electrolyzed and reduced, so that water replenishment is required about once a month. At the time of this water replenishment, one or two cells are not replenished, and the electrolyte inside the battery may be lost.
In addition, if the electrode group is short-circuited due to deterioration of the electrode plate, etc., the liquid consumption of only the cell becomes extremely fast, and the electrolyte inside the battery may be lost.

[0004] A cell in which the electrolyte in the battery has disappeared, the reaction area of the electrode plate is reduced, the internal resistance rises, and abnormally large heat is generated due to charge and discharge, and further reduction and heat generation are repeated.
Such a battery causes a large voltage drop and affects the vehicle performance. However, in some cases, the battery may be damaged due to abnormal heat generation.

On the other hand, in a sealed battery, a glass mat of fine fibers is arranged between a positive electrode plate and a negative electrode plate, and a predetermined amount of an electrolyte is retained on the mat to react and absorb O ₂ gas generated from the positive electrode during charging at the negative electrode. By doing so, rehydration is not required.
When these sealed batteries are also used as an assembled battery, a phenomenon called dry-up occurs in which one or two cells abnormally reduce the liquid compared to other cells due to variations in manufacturing and use environment. In this case, the internal resistance of the cell is extremely increased, causing abnormal heat generation, and eventually the internal resistance becomes infinite and the vehicle cannot travel.

[0006] As described above, when a specific one or two cells of a battery pack, both a liquid battery and a sealed battery, abnormally deteriorates, abnormal heat generation occurs, and if the battery is continued to be used as it is, sudden running becomes impossible. May cause.

[0007] In general, both the liquid battery and the sealed battery are repeatedly charged and discharged, so that the capacity of the battery is gradually reduced, and the running performance of the vehicle is generally reduced. When the capacity is reduced to a certain value, the vehicle cannot run and the battery is replaced with a new one. If a large number of batteries deteriorate almost uniformly and the capacity decreases uniformly, the running performance of the vehicle also gradually decreases.Therefore, the life of the battery can be grasped from the capacity meter attached to the vehicle, and the Battery replacement is possible.

However, when one cell and two cells are extremely deteriorated and affect the entire assembled battery, it cannot be detected by the existing capacity meter.

[0009]

From the above, it is important to detect an abnormality in a specific cell in order to safely use a vehicle. However, in an assembled battery having a large number of cells, an abnormality in one cell is detected. The voltage drop was also small from the viewpoint of the entire assembled battery voltage, and could not be detected by monitoring the voltage of the entire assembled battery. Further, if the voltage of each battery is monitored by drawing voltage lines from all the batteries, a defective battery can be detected. However, there is a risk of short-circuit at the time of assembling or the like, and there is a disadvantage that the configuration becomes complicated and the cost increases.

[0010]

SUMMARY OF THE INVENTION The present invention provides a simple and reliable apparatus for detecting the deterioration of a vehicle battery. Detection is performed based on the surface temperature of the tank, and an alarm is sounded by a buzzer or the like based on the detected temperature or a temperature difference between a normal cell and a cell that has abnormally generated heat.

In a state where an abnormal alarm is issued,
It outputs a signal that disables charging.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for detecting a deteriorated battery according to the present invention detects the temperature of an assembled battery composed of a large number of monoblock batteries using a temperature detection sensor such as a thermocouple or a thermistor. As a result, the heat generation of the element due to the deterioration of the specific cell or the abnormal running out of liquid is detected, and when the detected temperature exceeds a certain value or when the temperature difference between the cells reaches a certain value or more, the abnormally deteriorated cell is detected. Is determined to be present and an alarm is issued. By doing so, the deteriorated cells can be detected easily and inexpensively, and running failures and battery damage due to abnormal cells such as running out of liquid are eliminated, and the assembled battery can be used safely and safely.

[0013]

EXAMPLES The present invention will be described below with reference to examples.

FIG. 1 is a schematic view showing an embodiment of the deteriorated battery detecting apparatus according to the present invention. The second cell on the upper surface of a lid of a monoblock lead-acid battery 2 for a 12V type electric vehicle composed of 6 cells is shown. A temperature detecting sensor 1 such as a thermocouple or a thermistor is mounted on the fifth cell. Here 2
Although the temperature detection sensor 1 such as a thermocouple or thermistor is attached to the cell and the fifth cell, when a cell that abnormally generates heat due to deterioration or the like is generated, heat is transmitted to the element in the adjacent cell as well, and the cell of the cell is heated. The temperature of the lid and the side of the battery case rises, and the temperature of adjacent cells can be monitored by attaching temperature detection sensors such as thermocouples and thermistors to the second and fifth cells. Because you can. In addition, the normal cell cover and the battery side surface rarely exceed 60 ° C during charging,
Cells that have abnormally generated heat may exceed 100 ° C. Since an extreme temperature difference occurs as compared with a normal cell, information is transmitted to the processing device 3 and an alarm is issued from the processing device 3.

FIG. 2 is a schematic diagram showing another embodiment of the deteriorated battery detection device of the present invention. The processing device 3 issues a detection battery detection warning and outputs a detection signal to the charger 4 and the electric vehicle. However, after detecting a deteriorated battery, charging cannot be performed.

[0016]

As described above, since the deteriorated cells can be detected simply and inexpensively, running failures and battery damage due to abnormal cells such as liquid shortage are eliminated, and the assembled battery can be used safely and safely. The effect is enormous.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a deteriorated battery detection device according to the present invention.

FIG. 2 is a schematic diagram showing another embodiment of the deteriorated battery detection device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature detection sensor 2 Monoblock type lead storage battery 3 Processing device 4 Charger

Claims (3)

[Claims] 1. A detection device for an assembled battery in which a plurality of monoblock batteries are connected in series or in parallel, wherein at least one temperature detection sensor is mounted on a lid of each battery or on a battery case wall, A deteriorated battery detection device that issues an alarm when the temperature detected by the temperature detection sensor is equal to or higher than a predetermined value or equal to or higher than a predetermined value as compared with the average value of all the detected temperatures. . 2. The deteriorated battery detection device according to claim 1, wherein the temperature detection sensor is mounted every other cell or every several cells of each monoblock battery. 3. The deteriorated battery detection device according to claim 1, wherein a signal that disables charging is output when an abnormality alarm is issued.