Is the battery shorted or the main unit shorted? The short circuit of the power supply battery refers to the connection of the positive and negative groups inside the lead battery. The short circuit of the battery will generate a huge current, and the short circuit wire will generally be blown, which may cause fire or explosion in serious cases. Pay attention to the safety of the power supply battery, and recommend the installation of the power supply and battery Contact professional manufacturers.

The reasons for the internal short circuit of the battery:

(1) The quality of the separator is not good or defective, so that the active material of the plate passes through, resulting in virtual or direct contact between the positive and negative plates.

(2) The displacement of the separator causes the positive and negative plates to be connected.

(3) The active material on the electrode plate expands and falls off. Due to the excessive deposition of the fallen active material, the lower edge or side edge of the positive and negative plates is in contact with the sediment, causing the positive and negative plates to be connected.

(4) The conductive object falls into the power supply battery, causing the positive and negative plates to be connected.

(5) The "lead current" formed during the welding of the pole group is not completely removed, or there are "lead beans" between the positive and negative plates during assembly, and the separator is damaged during the charging and discharging process, causing the positive and negative plates to be connected.

The short circuit phenomenon of the battery is mainly manifested in the following aspects:

(1) The open circuit voltage is low, and the closed circuit voltage (discharge) quickly reaches the termination voltage.

(2) When a large current is discharged, the terminal voltage rapidly drops to zero.

(3) When the circuit is open, the density of the electrolyte is very low, and the electrolyte will freeze in a low temperature environment.

(4) When charging, the voltage rises very slowly and always maintains a low value (sometimes it drops to zero).

(5) During charging, the temperature of the electrolyte rises very quickly.

(6) During charging, the density of the electrolyte rises very slowly or hardly changes.

(7) No bubbles or gas appears very late when charging.

What are the causes of battery fire?

The virtual connection of the cable joint causes the contact resistance to be too large, and the contact surface is seriously oxidized after the temperature rises, which in turn causes the contact resistance to continue to increase, which will eventually cause electrical ignition or even arcing, igniting nearby combustibles and causing fire.

How to deal with battery short circuit:

Reduce the charging current, reduce the charging voltage, and check whether the safety valve body is blocked. Periodically charge and discharge. The float voltage and discharge voltage of lead-acid batteries in the power supply battery system have been debugged to the rated value before leaving the factory, and the discharge current increases with the increase of the load. The load should be adjusted reasonably during use, such as Control the number of electronic devices such as computers used. When installing lead-acid batteries, the tools to be used should be insulated. When wiring, the electrical appliances other than the battery should be connected first. After inspection, there is no short circuit. Finally, the battery should be connected. The wiring specification should be well insulated to prevent overlapping pressure. rupture.