Battery swelling? Everything you want to know is here!

Everyone is familiar with battery swelling. After the battery has been used for quite a long time, swelling appears, especially in summer when it becomes more serious. For a swollen battery it is better not to keep using it. Of course, slight swelling is acceptable, but for a severely swollen battery the best move is to replace it. In fact, many people do not know why an electric vehicle battery swells. Below we analyze the causes.

1. Technology change

Earlier lead-acid batteries were widely produced with the traditional cadmium-containing formula and the external formation process. Cadmium-containing lead-acid batteries resist high temperature and large current, but pollute the environment greatly. Today lead-acid batteries are strictly forbidden to contain cadmium, so with long-time charging under high temperature and large current, battery swelling is hard to avoid.

2. Safety valve pressure too high

Electric vehicle batteries have a safety valve to ensure safety. When the pressure inside the battery rises, the safety valve opens automatically to release the pressure, so that the battery can be used normally. When the internal pressure rises but the safety valve cannot open, swelling occurs.

3. Excessive charging current

Normally, electric vehicle batteries made by regular manufacturers have a set charging current value. Excessive voltage or charging current caused by various reasons makes the deposition on the electrode plates too fast, leading to insufficient chemical reactions. At the same time, if the temperature inside the battery rises rapidly and gas exhaust is not timely, swelling naturally occurs.

4. Overcharging of series-connected batteries

The batteries of some electric vehicles are connected in series to obtain larger capacity. When series-connected batteries are overcharged, the gas recombination inside the battery becomes poor, causing swelling.

5. Charger overcharging

When charging an electric vehicle battery,a float charge of2hours after the charger light turns green is fine, but not for too long, because saturation has been reached once the light turns green, yetthe charger does not stop charging the battery: a tiny current keeps flowing. Lead-acid batteries undergo chemical reactions and produce some hydrogen during charging and discharging. Normally the gas escapes through tiny pores, but when the exhaust holes of the battery are blocked and the gas cannot get out,plus the aggravation of overcharging, the battery case twists and deforms.

6. Non-compliant battery

 If the battery design does not reserve pressure-relief passages, the internal pressure becomes too large and the battery swells.

Therefore when choosing a battery, try to choose a high-quality one,such as Xupai battery. Xupai batteries are of very solid quality with good service. Sales, customer service, technical support and repair are very well established, so consumers can receive better after-sales service.

The above are the common causes of electric vehicle battery swelling. To avoid swelling, besides knowing the causes, pay attention to the following: even the best battery cannot withstand rough treatment. Many people neglect electric vehicle maintenance: bumpy roads on the way, frequent hard braking and overloading all damage the battery. So check the battery often - on the one hand to ensure normal battery operation, on the other to protect personal safety and avoid accidents.