Lead-acid battery is the most widely used power battery for electric storage vehicle, but with the continuous development of lithium battery technology, more and more people begin to replace lead-acid battery with lithium battery. Of course, at the same time, whether the controller of the vehicle needs to be replaced has become a hot topic.

Simply put, in general, if the battery is replaced and no other changes are made to the circuit system, then the controller of the vehicle does not need to be replaced. However, lithium batteries and lead-acid batteries have a large difference in energy density, so before changing the battery, you need to check whether the rated voltage and current of the controller support the use of lithium batteries.

Otherwise, the controller will be damaged due to overload. It is also common to replace a controller if it does not support lithium batteries. If you plan to replace the lead-acid battery of electric vehicle with lithium battery, it is recommended to find a professional to check before confirming. The following is the explanation given by professionals, which I organized into articles for your reference and study.

One: Overview

Electric car is a common means of transportation in our life. Battery is the power source of electric car. The batteries used are lead-acid battery and lithium battery.

A lead-acid battery is a battery whose electrodes are mainly made of lead and its oxides and whose electrolyte is a solution of sulfuric acid. Black gold and graphene batteries on the market are upgraded versions of lead-acid batteries.

Lithium battery is a kind of battery with lithium metal or lithium alloy as positive/negative electrode material and using non-aqueous electrolyte solution. Common lithium batteries include lithium iron phosphate, lithium manganese acid and lithium manganese acid batteries, of which the ternary lithium battery is the most widely used.

Two: the advantages and disadvantages of lead-acid batteries

The advantages of lead-acid battery: cheap, recyclable, mature manufacturing technology, high rate discharge performance is good, high and low temperature performance is good, easy maintenance, stable quality, safe and reliable use.

Disadvantages of lead-acid battery: large volume, heavy weight, low energy density, short cycle life, long charging time, recycling and refining will pollute the environment.

Three: advantages and disadvantages of lithium battery

The advantages of lithium battery: light weight, no memory effect, can be used with charge, high energy density, long driving distance, low self-discharge rate, long cycle life, green environmental protection.

Disadvantages of lithium battery: high production cost, expensive price, safety problems (such as fire, deflagration), poor resistance to low temperature, unable to replace the old, low recycling value.

In which cases do I need to replace a controller?

Lead-acid batteries and lithium-ion batteries have different voltage, capacity and other parameters, so it is necessary to replace the controller of the electric vehicle at the same time. So when do you need to replace the controller?

1. The original controller of the battery car is not compatible with the new lithium battery, so the controller suitable for lithium battery needs to be replaced.

2. After replacing the lithium battery, it is found that the range of the battery car has not been significantly improved, so it is necessary to replace the efficient controller suitable for lithium battery to improve the endurance of the electric car.

3. In order to improve the safety of lithium batteries, lithium batteries need more stringent protection measures. Therefore, you need to replace the BMS battery management system and controller applicable to lithium batteries to ensure battery safety.

In particular, when replacing the controller, you need to find a professional maintenance personnel to replace it. Because the electric vehicle control system is the key to the whole vehicle, improper work will bring bad effects on the whole vehicle.