For more than 20 years, SWE has been designing and developing battery packs manufactured to customer specifications using lithium-ion and lithium-polymer cells. SWE has invested heavily in acquiring technology and creating intellectual property related to the development of battery packs and battery systems utilizing the chemical composition of lithium ions and lithium polymers. SWE works with the intellectual community to share technological advances through international battery technology conferences and technical journals. SWE has been granted several patents directly related to lithium-ion battery control and holds a variety of relevant trade secrets - some of which are being considered for future patent applications. SWE has applied all of these intellectual property rights in its delivery products for above-ground, downhole and subsea applications.

lithium ion introduction

lithium-ion batteries have been developed to this level, There are few applications that cannot take advantage of the excellent cycle life, power and energy density, and wide operating temperature range inherent in lithium-ion technology. Lithium-ion batteries are also environmentally friendly.

Lithium-ion batteries are common in consumer electronics. They are one of the most popular battery types in portable electronics, have one of the best energy-to-weight ratios, have no memory effect, and lose power very slowly when not in use. In addition to consumer electronics, small lithium-ion batteries can be used in specialized applications ranging from implantable batteries in the human body to various satellites, hybrid vehicles and military aircraft. Due to their high energy density, lithium-ion batteries are becoming increasingly popular in defense, automotive and aerospace applications.

Battery Management Systems (BMS) for lithium-ion batteries Recent advances in electronics and new modular design concepts for building complex battery systems are making battery systems safer, more robust, more flexible, have a longer life, and are easier to charge and maintain. Battery pack protection circuits (PTC), shut-off separators, etc. (developed specifically for mass consumer use) provide multiple layers of safety not available in other chemical products.

All batteries sold by SWE comply with the manufacturer's UL 1642 requirements.

lithium ion battery transportation security

until 2003, the ministry of communications to the carriage of lithium ion battery or battery pack without any limitation. However, beginning in 2003/2004, the Department of Transportation required battery packs to pass the new Department of Transportation test. Prototype battery packs are not subject to this requirement.

characteristics of lithium ion battery

lithium ion battery can according to customer demand for size, suitability and performance. Lithium-ion batteries have a high energy density (ratio of weight to size).

each battery voltage: lithium ion battery for each section of the nominal voltage of 3.7 v. By using the cells in series, the battery pack can get any possible voltage in steps of 3.7 volts. For example, a lithium-ion battery uses 3 batteries to provide 11.1 volts, 4 batteries to provide 14.8 volts, or 10 batteries to provide 37 volts.

capacity: lithium-ion batteries placed in parallel to provide the required amount of ampere hours (Ah). Depending on the application requirements, Ah values can range from a few amps to several hundred amps. For example, a lithium-ion battery using three 2.6Ah batteries in parallel can produce 7.8Ah or ten 2.6Ah batteries in parallel can produce 26 Ah. There are many batteries with high Ah ratings that can be used to give you the capacity you need for your application.

Maximum charge rate: The maximum charge rate of lithium-ion batteries is 1C, and the maximum charge rate of lithium polymer batteries is 2C. Some batteries have charging rates as high as 10C. By choosing the right battery, you can get a lithium-ion battery pack that meets your requirements.

Charging technology: Lithium-ion batteries using typical Pack Protect circuitry have complex charging configurations and can only be used with chargers designed for that battery. However, if you use an SWE BMS (Battery Management System) with pulse charging, you only need a simple DC power supply and constant power to charge the battery pack, or connect it directly to a solar panel with only isolated diodes. In other words, there is no need for a special lithium-ion charger, thus reducing system costs.

Maximum discharge rate: The maximum discharge rate of lithium ion is 2C, and the maximum discharge rate of lithium polymer is 3C (note: some lithium polymer batteries have discharge rates greater than 30C).

discharge temperature range: lithium ion and lithium polymer discharge limits for 20 to 60 c c. SWE has selected chemical and empirical data to increase the discharge limit to -50°C.

Storage: Recommended storage temperature range: -20°C to 60°C (Storage temperatures below 20°C reduce permanent capacity loss). The recommended voltage range for short-term storage is 3.0 to 4.2 V per series battery. Long-term storage period: Lithium-ion batteries are stored at approximately 75% capacity (3.85V to 4.0V) and at low temperatures to reduce permanent capacity loss during long-term storage.

note: lithium-ion battery with high power and energy density. Take common sense precautions when handling or testing. Do not replace a single battery or module, or connect this battery in series or parallel with other batteries, as this may cause a fire or explosion.

warning: lithium-ion batteries, if not handled properly, there may be a risk of fire or chemical burns. Do not short-circuit, overcharge, squeeze, destroy, nail, reverse, disassemble, expose to temperatures above 100°C (212°F), or incinerate.

disposal: lithium-ion batteries do not contain harmful substances to the environment, so there is no disposal rules or restrictions. Lithium-ion batteries can be recycled to recover the relatively expensive cobalt contained in the cathode. After the battery is discarded, dispose of the old battery safely. Keep away from children. Do not disassemble or discard in the fire.