Repair methods for lithium iron phosphate battery packs in electric vehicles
Currently, when users encounter problems with their lithium iron phosphate battery packs, they simply take them to repair shops or authorized service centers to replace them with new lithium batteries. But is it really impossible to repair lithium iron phosphate battery packs? Is it technically difficult to overcome these challenges? After years of development in lithium-ion batteries, some brands have achieved success in lithium-ion battery pack repair technology. Therefore, it is indeed possible to repair lithium iron phosphate batteries in electric vehicles.
1. Repackaging: After an entire lithium iron phosphate battery pack is damaged, we often perform charge-discharge tests on the electric vehicle's lithium-ion battery pack. During the inspection, we often find that 50% of the batteries in a group are not damaged. This is because, in the series-connected battery pack, the lagging performance of individual batteries leads to a decrease in the overall battery pack's function, resulting in a decline in the overall battery pack's performance.
2. Water Replenishment: Replenishing water on a lithium-ion battery in an electric vehicle after approximately four months of use can extend its lifespan by an average of three months or more. It should be noted that each water replenishment process involves overcharging the battery, transitioning it from a near-starved state to a starved state. This overcharging is beneficial for increasing battery capacity.
3. Desulfation: The lithium iron phosphate battery repair equipment is used to desulfate the batteries.
The difference between passive and active balancing in lithium iron ion battery protection boards. Lithium-ion battery protection boards, playing a crucial role in battery systems, are gaining increasing attention as an effective means of extending battery life. Among these, the balancing system of the lithium-ion battery protection board, which plays a key role, has also attracted widespread attention. Currently, there are two methods on the market for balancing multi-series battery systems: traditional passive balancing and active balancing.
Active balancing and passive balancing are hotly debated topics in the electric vehicle industry. Much like the Qi and Sword factions of the Huashan Sword Sect, the debate is heated within the industry, while outsiders remain confused. Below, we'll guide you through understanding passive and active balancing in lithium iron ion battery protection boards and the differences between them!
Principle of lithium iron ion battery protection board
The reason why lithium-ion battery protection boards (rechargeable type) need protection is determined by their inherent characteristics. Due to the materials used in the lithium-ion battery protection board, it cannot be overcharged, over-discharged, over-currented, short-circuited, or subjected to excessively high temperatures during charging and discharging. Therefore, lithium-ion battery packs are always accompanied by a sophisticated protection board and a current fuse. The protection function of a lithium-ion battery is usually accomplished by the protection circuit board and a PTC (Power Transmission Control) working together. The protection board, composed of electronic circuitry, accurately monitors the cell voltage and the charging/discharging current in environments ranging from -40℃ to +85℃, and controls the current circuit's on/off state in real time. The PTC prevents severe damage to the battery in high-temperature environments.
