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What is our biggest concern when purchasing lithium batteries? There are no better parameters than the voltage, capacity, and power of lithium batteries.

But many friends are not very familiar with them yet. So today, lithium battery manufacturers will explain in detail what impact these three factors have on everyone?

1、 Energy and specific energy of lithium-ion batteries

The electrical energy that a battery can output for external work under certain conditions is called the energy of the battery, and the unit is generally expressed in Wh.

1. Theoretical energy: The discharge process of the battery is in a balanced state, the discharge voltage maintains a positive electromotive force value, and the utilization rate of the active substance is 100%. Under these conditions, the output energy of the battery is the theoretical energy (Wo).

2. Actual energy: The actual energy output during battery discharge is called actual energy.

The energy provided by a unit mass or unit volume battery is called mass specific energy or volume specific energy, also known as energy density. Specific energy can also be divided into theoretical specific energy and actual specific energy. The theoretical mass specific energy is calculated based on the theoretical mass specific capacity of the positive and negative active substances and the electromotive force of the battery. Actual specific energy is the ratio of the actual output energy of a battery to the mass (or volume) of the battery.

2、 Power and specific power of lithium-ion batteries

The power of a battery refers to the energy output per unit time (W or kW) of the battery under a certain discharge system. Specific power refers to the power output per unit mass or unit volume of a battery. The magnitude of specific power represents the amount of working current that a lithium battery can withstand.

With the increasing transparency of battery processes, lithium-ion battery manufacturers are increasingly listing ingredients as their core secrets, because the selection, processing, and reasonable combination of materials involve too much technical personnel's efforts. Some manufacturers use the same materials very smoothly, while others are full of troubles; Some manufacturers can make high-end batteries using mid-range materials, while others use the best materials to make batteries that are unbearable; The basic knowledge of ingredients can help everyone have a better understanding of ingredients and avoid some detours; However, due to limited skills, there may be some omissions. We hope everyone can criticize and correct us more. We also hope that everyone will study seriously, communicate sincerely, innovate boldly, and unite in their work to jointly promote the improvement of China's lithium-ion battery production level.

3、 Capacity and specific capacity of lithium-ion batteries

Battery capacity refers to the amount of electricity that can be obtained from a battery under certain discharge conditions, divided into theoretical capacity, actual capacity, and rated capacity.

1. Actual capacity refers to the actual amount of electricity released by a battery under certain discharge conditions. The actual capacity is always lower than the theoretical capacity.

2. Rated capacity refers to the minimum amount of electricity that a battery should discharge under certain discharge conditions when designing and manufacturing batteries.

The capacity of different types of rechargeable batteries varies. In order to compare lithium batteries with different types of batteries such as nickel hydrogen batteries, the concept of specific capacity is introduced. Specific capacity refers to the capacity given per unit mass or unit volume of a battery, known as mass specific capacity or volume specific capacity. The capacity of a battery refers to the capacity of its positive (or negative) electrode. During battery operation, the amount of electricity passing through the positive and negative electrodes is always equal. Therefore, in practical work, the positive electrode capacity is commonly used to control the capacity of the entire battery, while the negative electrode capacity is excessive.

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