Battery anatomy and analysis

When the lead battery test ends or the battery fails and fault cannot be eliminated, the battery needs to be dissected for observation and analysis. The steps are as follows:

1. Appearance check: Check whether there’s damage and cracks of the battery containers.

1.1 Measure the electrolyte density value, battery terminal voltage and each single cell voltage.

1.2 Check the condition of the battery pole and Lead strap.

2. Anatomical observation

2.1 For rubber-case battery, put the battery into a higher temperature environment to soften the sealer, use a knife to pick out the sealer, saw off the connection bar with an iron saw, pull out each plate group with an iron hook and put it into the iron tray.

2.2 For the plastic-case battery, saw the battery along the heat seal of the case and cover with an iron saw. After observing whether the wall welding joint has virtual welding, false welding and fracture, and the connection between the pole and the end column, saw the wall welding joint with an iron saw, pulled out each plate group, and put it into the iron tray.

2.3 Observe the condition of the plate group, whether there is a lack of separator, whether the lead strap is broken, the connection condition between the lead strap and the lug of the plate, whether there are falling plates and false welding phenomenon. Observe whether the connection condition between the pole and the lead strap, the pole and the end column is broken or not, and whether there is any foreign body in the plate group.

2.4 Observe whether there’s short circuit connection phenomenon on the side and bottom of the plate group and the position of the separator in the plate group and whether the edge of the separator is damaged.

2.5 Observe the electrolyte status in the battery case, the deposition status of active substances, whether there is foreign matter in the case, and whether there is cracking, damage, and communication between cells in the middle partition of the battery case.

2.6 After completing the above observation, use an iron saw to cut the joint between the plate and the plate strap, and check the condition of the positive plate, negative plate and separator one by one.

2.7 Observe whether the four frames of the positive plate are broken, the plate surface condition, the active material shedding condition, the corrosion and fracture of small grid ribs and whether the plate is bent, etc.

2.8 For the tubular positive plate, observe whether the spine is damaged, whether the spine is drop from gauntlet, whether the bottom bar is falling off, whether the lead strap is broken, whether the active material in the gauntlet is sinking, etc.

2.9 Observe the surface condition of the negative plate, whether there is any sign of sulfation, whether the active material shrinkage and hardening, whether there is expansion, accumulation and shedding phenomenon.

2.10 Observe the corrosion degree of each separator, whether there is damage, fracture, corner drop, perforation phenomenon, when observing the separator, clean the separator with water and carefully observe.

3. Analysis record

After the battery anatomy observation, record the observation results, analyze the reasons of affecting the battery performance and the test termination, and put forward the battery anatomy analysis opinions.