Introduction:
In the field of battery repair, the consistency of the battery pack is a key element, which directly affects the service life of lithium batteries. But what exactly does this consistency refer to, and how can it be accurately judged? For example, if there is a difference in capacity between batteries, how much of this difference should be controlled appropriately? This is important because it concerns how long your lithium battery can last.
The consistency of batteries is an extremely important concept in the field of batteries. Simply put, the better the consistency of the battery pack, the more it can charge or release, and the overall utilization rate of the battery pack will also be greatly improved. Specifically, battery consistency covers eight main aspects, namely voltage, capacity, internal resistance, constant current ratio, discharge plateau, cycle life, SOC charge, and self discharge rate. Given the complexity of the entire explanation, we will focus on analyzing three key elements that are easy to control and judge.
Consistency of batteries
The consistency of batteries is an extremely important concept in the field of batteries. Simply put, the better the consistency of the battery pack, the more it can charge or release, and the overall utilization rate of the battery pack will also be greatly improved. Specifically, battery consistency covers eight main aspects, namely voltage, capacity, internal resistance, constant current ratio, discharge plateau, cycle life, SOC charge, and self discharge rate. Given the complexity of the entire explanation, we will focus on analyzing three key elements that are easy to control and judge.
Consistency of voltage
Firstly, the consistency of voltage. Especially before assembling lithium batteries, it is necessary to ensure that the voltage between each cell is completely consistent. In the civilian low-speed or energy storage field, it is generally considered to meet the standard to strictly control the voltage error value within 5 millivolts. This is also why careful measurement of cell voltage is the primary and essential step before assembling lithium batteries. For example, in a battery pack composed of multiple battery cells, if the voltage deviation of one battery cell from the others exceeds 5 millivolts, the battery cell may experience overcharging or undercharging during the charging process. Over time, this not only affects the overall performance of the battery pack, but also significantly shortens its service life.
Consistency of capacity
Secondly, the capacity size between each battery cell should be kept as consistent as possible. In an ideal state, the capacity of each battery cell should be no different, but in actual production and use, it is almost difficult to achieve complete consistency. Therefore, the error value of capacity is usually controlled at around 2% as much as possible. Of course, in a group of batteries, it is acceptable for individual cells to have slightly higher capacity, but in actual use, they should be treated according to the standards of low capacity cells. For example, in a 48 volt battery system consisting of 16 series connected battery cells, where the capacity of 15 cells is basically the same, and the capacity of the 16th cell is slightly higher, the actual available capacity of the entire battery pack should be based on the lower capacity of these 15 cells. Because the current is the same in a series connected battery pack, if charged and discharged according to the standards of high-capacity cells, low capacity cells may be damaged due to excessive charging and discharging, thereby affecting the performance and lifespan of the entire battery pack.
Consistency of internal resistance
The last thing to talk about is internal resistance. The difference in internal resistance between each cell in the battery pack should be minimized, and it is generally appropriate to control it within 15%. The small difference in internal resistance can effectively reduce the imbalance phenomenon of batteries during charging and discharging. A battery pack with good internal resistance consistency can significantly reduce energy loss and heat generation during charging and discharging. Taking the battery pack of electric vehicles as an example, if the internal resistance consistency of the battery cells is poor, during fast charging, the cells with higher internal resistance will generate more heat, which not only reduces charging efficiency, but also may cause safety hazards such as overheating and fire. When the consistency of internal resistance is guaranteed, the charging and discharging efficiency of the battery pack can be improved, and the safety can be greatly enhanced.
Heltec Battery Equalizer
In short, in the process of battery repair, assembly, and use of battery packs, it is crucial to pay full attention to and strictly control the consistency of the battery, especially in the three key aspects of voltage, capacity, and internal resistance, in order to extend the service life of the battery and improve the performance of the battery pack.
In the journey of ensuring battery consistency, our battery balancer can be regarded as a reliable assistant, suitable for new energy vehicles and electric vehicle batteries, and can accurately monitor and adjust every cell in the battery pack. In the field of new energy vehicles, its efficient balancing function ensures that each battery cell can maintain its optimal working state, effectively reducing energy loss caused by inconsistent battery cells, significantly improving the vehicle's range, while reducing safety risks such as battery overheating, and safeguarding your green travel. For electric scooter users, using our battery balancer can maintain good consistency of your electric scooter battery at all times, extend battery life, and reduce the hassle and cost of frequent battery replacement. Whether it's a new energy vehicle or an electric scooter, our battery balancer can provide you with more stable and long-lasting power support by maintaining battery consistency, allowing you to easily enjoy convenient travel and efficient energy utilization. Choosing our battery balancer means choosing to invest in a reliable guarantee for your battery and embark on a new high-quality experience of battery use.
Request for Quotation:
Jacqueline: jacqueline@heltec-bms.com / +86 185 8375 6538
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Post time: Apr-17-2025