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Can the lead-acid battery of an electric bicycle be changed to a lithium battery?

pxid 2021-09-11 14 times

Today, we are going to talk about a topic that everyone is interested in: Can lead-acid batteries of electric bicycles be changed to lithium batteries?

Let me start with the conclusion: we do not recommend or support replacing the battery of a lead-acid electric bicycle with a lithium battery, because this behavior is risky and brings potential safety hazards. In severe cases, it may cause the battery to short-circuit or even explode.

Under normal circumstances, electric bicycles equipped with lead-acid batteries are equipped with an EABS, or electronic auxiliary braking system, to assist the vehicle in deceleration and braking.

At this time, the brake of the lead-acid electric bicycle will bring great energy back to the battery. The lead-acid battery on a lead-acid electric vehicle is a relatively large capacitor, which can carry and timely recover the energy generated when the vehicle brakes.

Can the lead-acid battery of an electric bicycle be changed to a lithium battery?

But this energy is harmful to lithium batteries. Lithium batteries for electric bicycles used on the market are generally battery packs, which will be equipped with a BMS (Battery Management System) to monitor and intelligently manage them. And there is another component in BMS called MOS tube.

When the energy generated during braking is large and urgent, it is possible to burn out the BMS in the lithium battery and destroy the protection system of the battery pack. Under normal circumstances, if there is a problem inside the lithium battery, the BMS will take the initiative to turn off the MOS tube after detecting it to avoid further deterioration of the situation. When the BMS is burned out, even if there is a problem inside the lithium battery, it cannot be handled like a normal battery, which may cause short-circuit or even explosion.

Therefore, we do not recommend or support the replacement of lead-acid electric bicycle batteries with lithium batteries.

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