JP4656677B2 - Deteriorated battery detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for detecting a deteriorated battery of an assembled battery in which a large number of batteries are connected to a series and used as a high voltage power source, such as for electric vehicles, transport vehicles, and AGVs.
[0002]
[Prior art]
A number of batteries, such as those for electric vehicles, transport vehicles, and AGVs, connected to the series and used as a high-voltage power source include liquid batteries that require replenishment and sealed batteries that do not require replenishment.
[0003]
In the case of a liquid battery, if charging and discharging are repeated, water in the electrolytic solution is electrolyzed and decreases, so replenishment about once a month is necessary. During this water replenishment, 1 to 2 cells may not be refilled, and the electrolyte inside the battery may disappear. Further, when the electrode plate group is short-circuited due to deterioration of the electrode plate or the like, the liquid in the cell is extremely quickly reduced, and the electrolyte in the battery may be lost.
[0004]
In the cell in which the electrolyte solution in the battery has disappeared, the reaction area of the electrode plate decreases, the internal resistance increases, and abnormally large heat generation occurs due to charge / discharge, and further liquid 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.
[0005]
On the other hand, in a sealed battery, a glass mat of fine fibers is arranged between positive and negative electrode plates, a predetermined amount of electrolyte is held on the mat, and O ₂ gas generated from the positive electrode during charging is reacted and absorbed by the negative electrode. , Replenishment is unnecessary. When these sealed batteries are also used as assembled batteries, a phenomenon of dry-up in which one or two cells are abnormally reduced in comparison with other cells may occur due to variations in manufacturing and use environments. In this case, the internal resistance of the cell increases extremely, causing abnormal heat generation, and eventually the internal resistance becomes infinite and the vehicle cannot run.
[0006]
In this way, if a specific battery of about 1 or 2 cells in a battery pack, whether it is a liquid battery or a sealed battery, is abnormally deteriorated, abnormal heat generation will occur, and if the battery is used as it is, it will suddenly become impossible to run. There is.
[0007]
Generally, the capacity of a battery is gradually reduced by repeatedly charging and discharging both a liquid battery and a sealed battery, and the traveling performance of the vehicle is generally lowered. When the capacity drops to a certain value, the vehicle cannot run and the battery is replaced as a lifetime. When a large number of batteries deteriorate almost uniformly and the capacity decreases uniformly, the vehicle's running performance also gradually decreases, so the battery life can be grasped from the capacity meter attached to the vehicle, Battery replacement is possible.
[0008]
However, when one cell or two cells are extremely deteriorated and affect the entire assembled battery, it cannot be detected by an existing capacity meter.
[0009]
[Problems to be solved by the invention]
From the above, it is important to detect an abnormality in a specific cell in order to use the vehicle safely. However, in an assembled battery with a large number of cells, an abnormal voltage drop of one cell can cause an overall assembled battery voltage. From the point of view, it was very small, and this could not be detected by monitoring the voltage of the entire assembled battery. In addition, if a voltage line is drawn out to all the batteries and the voltage of each battery is monitored, a defective battery can be detected. However, there is a risk that a short circuit may occur at the time of incorporation, and the configuration becomes complicated and the cost is increased.
[0010]
[Means for Solving the Problems]
The present invention simply and reliably supplies a vehicle battery deterioration detection device, and detects the heat generation of an element due to deterioration of a specific cell or abnormal liquid leakage by the surface temperature of a lid or a battery case. A warning is given by a sound such as a buzzer according to a temperature or a temperature difference between a normal cell and an abnormally heated cell.
[0011]
In addition, in a state where an abnormality alarm is issued, a signal that disables charging is output.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus for detecting a deteriorated battery according to the present invention detects an assembled battery temperature composed of a large number of monoblock batteries by 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 a specific cell or abnormal liquid breakage is detected, and when the detected temperature exceeds a certain value or when the temperature difference between cells reaches a certain value, the abnormally deteriorated cell It is determined that there is an alarm and issues an alarm. By doing so, the deteriorated cell can be reliably and easily detected at a low cost, and there is no running failure or battery damage due to an abnormal cell such as a liquid shortage, and the assembled battery can be used safely and safely.
[0013]
【Example】
Hereinafter, the present invention will be described by way of examples.
[0014]
FIG. 1 is a schematic view showing an embodiment of the deteriorated battery detection device of the present invention. The second cell and the fifth 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. And a temperature detection sensor 1 such as a thermocouple or a thermistor. Here, the temperature detection sensor 1 such as a thermocouple or thermistor is attached to the second cell and the fifth cell. However, when a cell that is abnormally heated due to deterioration or the like is generated, heat is transferred to the element in the adjacent cell as well, The temperature on the lid of the cell 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. This is because the temperature can be monitored. In addition, the normal cell top and battery side hardly exceed 60 ° C. even during charging, and abnormally heated cells may exceed 100 ° C. Compared with a normal cell, an extreme temperature difference occurs, so that information is transmitted to the processing device 3 and an alarm is issued from the processing device 3.
[0015]
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 alarm for a deteriorated battery, and outputs a detection signal to the charger 4 and the electric vehicle. After the battery is detected, charging is disabled.
[0016]
【The invention's effect】
As described above, the ability to reliably and inexpensively detect deteriorated cells eliminates run-off and battery damage due to abnormal cells such as running out of liquid, so that the assembled battery can be used safely and safely, and the effect on electric vehicles is enormous. is there.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of a deteriorated battery detection device of the present invention. FIG. 2 is a schematic diagram showing another embodiment of the deterioration battery detection device of the present invention.
DESCRIPTION OF SYMBOLS 1 Temperature detection sensor 2 Monoblock type lead acid battery 3 Processing apparatus 4 Charger

Claims (1)

A deterioration battery detecting device for detecting deterioration of a mono block type battery, the with the deterioration battery detection device with a plurality of temperature detecting sensor processing unit and, in the processing device temperature detected by the plurality of temperature detection sensor When a predetermined value or more is reached, an abnormality alarm is issued , and the plurality of temperature sensors are attached to the lid or battery wall of the cell constituting the monoblock battery every other cell or several cells. deterioration battery detection apparatus characterized by there.

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