An important factor affecting the performance of lithium batteries is internal resistance. As a key indicator of lithium battery performance, internal resistance has a profound impact on the battery's discharge performance, charging performance, self-discharge rate, temperature characteristics and cycle life.

The influence of lithium battery internal resistance on battery performance

1. Lithium battery discharge

In terms of discharge performance, the greater the internal resistance of the lithium battery, the more voltage is lost during the discharge process, resulting in a decrease in output voltage. In addition, a larger internal resistance will also limit the size of the output current. The size of the lithium battery internal resistance directly affects the discharge capacity of the battery. In scenarios where high power output is required, lithium batteries with larger internal resistance may not be able to meet the demand, resulting in performance degradation.

2. Lithium battery charging

In terms of charging performance, internal resistance also plays a key role. When the internal resistance is large, the charging current will be limited, resulting in a slower charging speed and affecting the charging efficiency of the battery. Especially with the widespread application of fast charging technology, reducing internal resistance has become the key to improving charging performance.

3. Internal resistance also affects the self-discharge rate of lithium batteries. Self-discharge refers to the loss of power caused by internal chemical reactions when the battery is not connected to an external circuit. The larger the internal resistance, the higher the self-discharge rate, which will also cause rapid power loss when the battery is not in use.

4. The influence of internal resistance on the temperature characteristics of lithium batteries

Lithium batteries generate heat when working, and the larger the internal resistance, the more heat is generated. This may not only cause the battery temperature to rise, but also affect the stability and safety of the battery.

Optimization measures to reduce the internal resistance of lithium batteries and improve battery performance

1. Optimize battery materials: Select positive and negative electrode materials and electrolytes with high conductivity and low polarization effect, which can effectively reduce the internal resistance of the battery.

2. Improve battery structure: By optimizing the battery pole design, diaphragm thickness and electrolyte distribution, the internal resistance and polarization effect of the battery can be reduced, thereby reducing the internal resistance.

3. Apply BMS management to reduce internal resistance: BMS can accurately control and monitor the battery to avoid problems such as overcharging and discharging and overheating of the battery, so as to keep the internal resistance of the battery at a low level.

4. Reduce the internal resistance of lithium batteries by adopting advanced thermal management technology: By adopting advanced thermal management technology to reduce the internal resistance of lithium batteries, such as liquid cooling, air cooling, etc., the operating temperature of the battery can be effectively controlled to reduce the increase in internal resistance caused by temperature increase.

Bosa Energy

Bosa Energy with 150GWH capacity and over 400,000 electric bus/utility vehicle application experience we are listing first 5 in China power battery industry. We cooperate with Yutong/Geely/Damiler etc.

We are also offering Container ESS systems and delivered 6GWh in 2024(=75,000 Model3 with 80kWh battery). In local market, we are offering OEM service for Changan, CALB, National grid, Ping Gao Electric , Xuji electronics, Ruineng electronics, they are our main Container ESS suppliers in China Market.

We are the most professional supplier of marine lithium batteries in China, and our export volume of marine batteries consistently ranks among the top three in China; We are also the top 1 exporter of lithium battery modules in China, specializing in providing various lithium battery module solutions.

For excellent quality and performance our products are popular in more than 30 countries in the world. We also have established warehouse in Germany and Netherlands to provide safety stock timely delivery for our customers.

l Customized and Flexible

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l Rich experience on Lithium battery pack