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Matsushita Battery Use Notes

Preventing Overdischarge

When Panasonic battery discharges to the termination voltage, the continued discharge is called overdischarge. Overdischarge will seriously damage the battery, which is very harmful to the electrical performance and cycle life of the battery.

When Panasonic battery discharges to the termination voltage, the internal resistance is larger, the concentration of electrolyte is very thin, especially the inner hole and surface of the plate are almost neutral. When overdischarge occurs, the internal resistance has a tendency of heating, volume expansion, and when discharge current is larger, the obvious heating (or even heating deformation) occurs. At this time, the concentration of lead sulfate is particularly high, and the possibility of branch crystal short circuit increases, and at this time, lead sulfate It will crystallize into larger particles, i.e. irreversible sulfation, which will further increase the internal resistance, and the recharging recovery ability is very poor, or even can not be repaired. Overdischarge should be prevented in the use of storage batteries. Undervoltage protection is an effective measure. In addition, because the "under-voltage protection" of electric vehicles is controlled by the controller, but some other devices such as voltmeters, indicator lights and other power-consuming appliances outside the controller are directly powered by batteries, the supply of power is generally not controlled by the controller, and the locks (switches) of electric vehicles start to use electricity once they are closed. Although the current is small, if the discharge lasts for a long time (1-2 weeks), it will be over-discharged. Therefore, it should not be opened for a long time and should be switched off immediately when not in use.

Preventing Overcharging

Overcharging will increase the water loss of the battery, accelerate grid corrosion, soften the active material, and increase the probability of battery deformation. Overcharging should be avoided as far as possible; the selection of charger parameters should be well matched with batteries, and the operation status of batteries in high temperature season should be fully understood, as well as the change of the whole service life. Do not place the battery in an overheated environment when using, especially when charging, keep away from the heat source. After the battery is heated, cooling measures should be taken to recharge the battery until the temperature of the battery returns to normal. Panasonic batteries should be installed in a position that ensures good heat dissipation as far as possible. Charging should be stopped when overheating is found. Chargers and batteries should be checked. The charging time should be shortened when the discharge depth of the battery is shallow or the ambient temperature is high.

Prevent short circuit

When Panasonic battery is in short circuit state, its short circuit current can reach hundreds of amperes. The stronger the short-circuit contact is, the larger the short-circuit current is. Therefore, a lot of heat will be generated in all the connections, and the more heat will be generated in the weak links, which will fuse the joints and cause short-circuit phenomenon. Local explosive gases (or explosive gases accumulated during charging) may occur in the battery, sparks will occur when the connection is fused, which will cause the battery to explode; if the short-circuit time of the battery or the current is not particularly large, it may not cause the connection to fuse, but the short-circuit will still cause overheating, which will damage the adhesive around the connection bar, leaving hidden dangers such as leakage. Therefore, the battery should not be short-circuited, and special care should be taken in installation or use. Insulation measures should be taken for the tools used. When connecting, electrical appliances other than batteries should be connected well. After checking, no short-circuited battery should be connected. Wiring specifications should be well insulated to prevent overlapping pressure from rupturing.

To prevent loosening and fastness of connection, if the contact is not firm and the degree is light, bad conductivity will occur, which will make the contact part of the line heated, the line loss is large, the output voltage is low, which will affect the power of the motor, reduce the driving mileage or can not ride normally; if the connection terminal components are not firmly contacted (most of the faults are at the connection end and the connection joint), the terminal will heat up, shadow. The combination of ringing terminal and sealant will lead to leakage of liquid and acid creeping over a long period of time. If the contact is not strong during driving or charging, it may cause circuit breaking, which will produce strong sparks, and may ignite the explosive gases inside the battery (especially the battery which is just charged), because there are more explosive gases in the battery and the battery has enough electricity, the sparks are strong when the circuit breaks, and the possibility of explosion is quite large. )

Electric vehicles should bear strong vibration in operation. Therefore, the reliability of all connections should be assessed. Connectors should have "self-locking" function to prevent vibration and pulling from falling off. Connectors with batteries should be adopted and soldered firmly with solder. Connectors and connections should be pressed (solder soldering can also be used once after soldering to increase reliability). Sex).

Prevent sunshine

Exposure to sunlight will increase the temperature of the battery and the activity of the active substances of the battery, which will affect the service life of the battery.

UPS Battery-Discharge

When discharging UPS batteries, please control the temperature of the batteries in the range of - 15 ~50 ~C. Continuous discharge current should be controlled below 3CA (H below 6CA). The discharge termination voltage varies with the magnitude of the current, as described below. Note that when amplifying, the voltage should not be lower than the following voltage. Please charge quickly after discharging. If discharged carelessly, please charge immediately.

Safety precautions

There is no short circuit between batteries and terminals. Short circuit between terminals may cause scald, smoke and fire hazards. )

Do not charge in an airtight container. (Charging in an airtight container may cause personal injury if the container ruptures. )

Batteries should not be placed in closed spaces or near fire sources. If placed in these places, it may cause explosion and fire hazards. )

Torque wrench, wrench and other metal tools, please use plastic tape after insulation treatment. If no insulation treatment is carried out, the short circuit will lead to scald, battery damage and explosion. )

The battery can not be decomposed or reformed. (power storage)




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