Electric tools refer to mechanical tools that are powered by small-capacity electric motors or electromagnets to drive the working head for operation. Common electric tools include electric drills, electric grinding wheels, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete vibrators, electric planers, etc. Electric tools are widely used in various fields such as industrial manufacturing, wood processing, road construction, public cleaning, and daily household use. With the rapid development of the intelligent era, people have put forward new requirements for power tools to be used as needed. Cordless power tools have gradually become the mainstream of development. As the core component of cordless power tools, batteries usually need to be powered by built-in nickel-metal-hydride batteries or lithium batteries to meet People's Daily needs!

Features of Yuanli power tool batteries

● High capacity density

● Wide operating temperature range (-20℃ to 50℃)

● High cost-effectiveness

● No memory effect

● Flexible support for customization

● Low self-discharge

● Long cycle life

The battery is lightweight

● Environmentally friendly and pollution-free

● Stronger current discharge performance.

● Higher discharge platform, strong fast charging capability, and longer working time after each charge.

A comprehensive BMS with multiple protection functions.

● Fully compatible with original power tools and chargers.

● Safe and reliable, our company holds various certifications such as ISO13485, ROHS, CE, UL, UN38.3, and MSDS!

Lithium polymer battery series

Yuanli's power tool batteries are made of high-quality soft-pack lithium polymer batteries and integrated with BMS. Compared with traditional cylindrical lithium-ion power tool batteries, we offer more powerful discharge performance and longer operating time and cycle life. Our high-rate power tool batteries are compatible with original power tools.

Specification parameters of lithium polymer batteries for some power tools

Battery type: Lithium polymer battery

Voltage: 11.1V(Customizable)

Combination method: 3S1P

Discharge rate: 5C - 50C(customization supported)

Battery capacity: 1300mAh (15C)/1800mAh (25C)(Customization supported)

Note: For more information on battery solutions for power tools, please contact Yuanli New Energy. Our company supports flexible customization!

Solutions for high-rate pouch batteries in the power tool industry

In order to meet the characteristics of high-power operation and long service life of power tools, Yuanli New Energy has made special considerations in product design, including battery cell development, electronic component selection and structural component design, to ensure that the battery cells can discharge at high rates, have low temperature rise and long service life, and that the electronic solutions and structural components are safe and reliable.

Battery packs (Packs) for power tools are mainly composed of lithium polymer batteries, electronic components and structural components. Currently, lithium polymer batteries are mainly divided into two types: pouch polymer batteries and cylindrical lithium polymer batteries. Among them, high-rate pouch lithium polymer batteries are gradually replacing cylindrical batteries and becoming the mainstream.

High-rate soft-pack lithium polymer battery pack solution

Compared with cylindrical batteries, high-rate soft-pack lithium polymer batteries have gradually gained attention in recent years due to their advantages such as light weight, good rate performance, long cycle life, higher safety and flexible size customization. For pouch batteries, to meet the high-rate discharge requirements of power tools, considerations can be made from the cell structure and chemical system design to reduce the internal resistance of the battery and minimize the polarization during charging and discharging, thereby enhancing the rate performance.

1.1: Cell structure

Yuanli New Energy adopts the lamination process in the production of battery cells. The lamination battery process can effectively avoid core defects such as powder shedding and gaps caused by the bending of electrode sheets and separators during the winding process. Meanwhile, in terms of rate performance, the laminated structure battery has better rate performance compared to the common structure of the winding process, the mid-position structure of the tabs, and the multi-tab structure battery. The multi-tab structure of the high-rate soft-pack lithium polymer battery of Gripe can significantly reduce the internal resistance of the battery and improve the rate performance due to the larger number and uniform distribution of tabs, and can support discharge above 10C. Effectively reduce the temperature rise during high-rate battery discharge and significantly extend the battery's cycle life. Multi-tab structure batteries have been applied in fields such as unmanned aerial vehicles, models, emergency start power supplies, and UPS.

1.2: Chemical System Design

To meet the high-rate discharge characteristics of power tools, it is necessary to reduce the internal resistance of the battery as much as possible and minimize the polarization during battery charging and discharging. Besides adopting a multi-tab lamination process in the battery structure, corresponding considerations should also be made in the design of the material system.

Firstly, the positive electrode usually adopts single-crystal high-nickel materials. Single-crystal materials are less prone to cracking and have higher stability and safety than polycrystalline materials. Products produced by single crystal technology can effectively solve the problems of drastic changes in the battery electrochemical environment caused by the cracking and breaking of secondary particles due to the secondary particle agglomeration technology, which leads to shortened battery cycle life and performance deterioration. They have significant advantages in high-temperature cycle stability, structural stability, and safety performance of the products.

Secondly, the negative electrode is generally made of high-rate graphite material to meet the requirements of lithium intercalation and deintercalation during fast charging and discharging. For products with high energy density requirements, silicon-doped negative electrodes can also be used. For the electrolyte, it is necessary to select a solvent system with low gas production and excellent kinetic performance. Moreover, in the development of additives, it should be able to reduce the resistance of the positive electrode film formation, inhibit the decomposition of the electrolyte at the positive electrode interface and the dissolution of transition metal elements, and also ensure the stability and safety of the film formation at the negative electrode. For separators, products with high porosity and low air permeability should be adopted to meet the rapid migration of lithium ions. For tabs and current collectors, under the premise of meeting the process capacity and energy density, the ohmic impedance of the battery and its influence on the temperature rise during charging and discharging should be fully considered.

In summary, based on the multi-pole ear laminated structure, Yuanli New Energy selects a chemical system with better kinetic performance, enabling the battery cells to support continuous fast charging at 5C, continuous fast discharging at 5C to 50C, and a cycle life of over 800 times.

By replacing the existing cylindrical battery packs with high-rate soft-pack lithium polymer battery packs of the same size, the energy can be increased by approximately 26%. If the energy is kept consistent with that of the cylindrical battery pack, the weight of the pouch battery pack can be reduced by a certain proportion.