技術 101 · 電動輪椅 ·Dec 29, 2018

How to choose an electric wheelchair - battery

There are many types of batteries for electric wheelchairs. The following short article will explain them to you.

Samsung wheelchair

1. Lead-acid batteries (cheap, but heavy)

2. Domestic lithium batteries (lightweight, cheap, but may not have BMS control)

BMS domestic electricity

3. Dual independent lithium batteries (often said that they can be used on airplanes, but are dangerous. Accidents with this type of model are common in the news)

Panasonic

4. Imported lithium batteries (usually with BMS)

The BMS system Battery Managment System can calculate and stabilize the current and improve performance. It can be charged quickly and has a longer and stable life.

BMS wheelchair

5. Independent lithium battery that can be used on airplanes (the most stable, ultra-safe, can be used on airplanes, and has evidence)

wheelchair flight

Battery type	Lead-acid batteries	lithium battery
Battery type	Lead-acid batteries	Domestic lithium battery	Dual independent lithium batteries	Imported lithium batteries (usually with BMS)	Independent lithium battery that can be used on airplanes
advantage	Low prices are cheap. Reliable and proven for over 140 years. Large capacity, resistant to overcharging. Internal resistance is low. Can provide high current. Available in a variety of shapes and capacities. Many suppliers.	High energy density - high energy. Does not require prolonged use to remain active. Just charge it regularly. Low automatic discharge rate - Low maintenance requirements - no periodic drains required; no memory. Specialty batteries can provide very high currents for tools such as electric wheelchairs.
advantage		low price	Lightweight and separable	Stable current and high efficiency, fast charging, longer and stable life	Lightweight and efficient, fast charging
shortcoming	Very bulky. High automatic discharge rate, leakage power. Need to be used frequently to maintain activity. The efficiency is only 70%, but with some special designs, it can be as high as 85% to 90%. There is a risk of overheating when charging Not suitable for fast charging The life span is 300 to 500 charge and difference cycles. If the electrolyte solution is poor, the shelf life is uncertain.	Packaging protection is required, as is the circuit to keep voltage and current within safe limits. It ages even when not used - storage at 40% charge in the shade will reduce the aging effect. Shipping Restrictions - Larger quantity shipments may be subject to regulations. This restriction does not apply to portable batteries. Expensive to manufacture Not quite mature yet - metals and chemicals are constantly changing.
Commonly seen in styles	heavy duty vehicle	Domestic foldable electric wheelchair	Domestic electric wheelchair	Foldable electric wheelchair	Lightweight electric wheelchair
weight	very heavy	light	very light	light	very light
Price	$	$$	$$	$$$	$$$
Lifespan (charge-difference cycle)	300-500	500-1000	500-1000	1000	1000
Remark	Need daily use	Cheap and relatively unstable	It can be charged independently, but it is best to charge the two batteries at the same time, otherwise it will heat up if the high battery is charged and the low battery is charged.	More stable, safe and fast charging	Relatively stable, super safe, can be used on planes, and has evidence and evidence