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Lithium iron phosphate batteries, as one of the favored batteries for new energy electric vehicles, have seen the emergence of many lithium iron battery manufacturers in recent years. This has led to many brands of lithium iron phosphate batteries on the market, with varying prices. So how to determine which brand of lithium iron phosphate battery is good has become a concern for battery users. Now let the manufacturer of Grep batteries briefly explain from which aspects to judge which brand of lithium iron phosphate battery is good.

Lithium iron phosphate battery

For consumers, regardless of the brand of the battery, the quality of the battery is mainly judged from the following aspects:

1、 The safety of lithium iron phosphate batteries

Among lithium batteries, it is widely recognized that lithium batteries with LiFePO4 as the positive electrode material have the best safety performance. Mainly due to its good oxygen retention ability under high temperature conditions, LiFePO4 does not lose oxygen even at temperatures exceeding 500 ℃, which is much higher than drugs such as lithium cobalt oxide, lithium manganese oxide, and ternary materials. However, under abusive conditions, even lithium batteries with LiFePO4 as the positive electrode can still have safety issues.

2、 Price of lithium iron phosphate batteries

There are three pricing methods for lithium iron phosphate batteries: one is the price of only buying lithium iron phosphate battery cells, another is the price of lithium iron phosphate batteries without protective plates, and the last is the price of batteries with protective plates. These three methods have completely different prices. Let's take a closer look below:

1. Only buy lithium iron phosphate battery cells

Lithium iron battery cells come in two types: brand new cells and tiered cells. Brand new cells are new products that go through the process from raw materials to cost. Tiered cells refer to cells that are reused, such as lithium iron phosphate batteries used in new energy vehicles. When the cells decay to a certain extent, they cannot provide power or capacity for the vehicle, but they are not damaged. After certain repairs and adjustments, they can be used in the next level of electrical equipment. For example, backup power supply for communication base stations, electric bicycles, and some 3C products. Therefore, some people often find that there are significant differences in quotes from different vendors when purchasing battery cells, with some even ranging from 8 yuan per hour to 2 yuan. Most of the low-priced batteries are lithium iron phosphate batteries. Of course, it's not that tiered battery cells are bad, it depends on the specific product application requirements.

2. Only purchase lithium iron phosphate batteries without protective plates

In this form of purchase, there are also differences between brand new batteries and tiered batteries. Therefore, when purchasing, it is best for buyers to first understand whether the price quoted by the battery supplier is for brand new lithium iron phosphate batteries or tiered batteries. Generally speaking, the price quote for a tiered battery is roughly equivalent to half the price of a brand new battery. Lithium iron phosphate batteries without protective plates are basically single low voltage batteries, and the number of parallel and series connected cells is generally within a certain range. Because the consistency of lithium iron phosphate battery cells is not very good, the number of cells that can be used in series and parallel is limited. Such batteries generally have low voltage and capacity, and larger ones are prone to problems. Generally speaking, the current quotation for lithium iron phosphate battery cells produced by powerful lithium iron phosphate battery manufacturers mainly provides brand new batteries at a price of around 8 yuan per hour; For manufacturers of lithium iron phosphate batteries, the price is generally around 6 yuan per hour, and some even around 5 yuan per hour.

3. Lithium iron phosphate battery with protective plate

Lithium iron phosphate batteries with protective plates are generally single cells or battery packs with a voltage of 12V or higher. These types of batteries are divided into new and graded batteries. The price difference of such batteries is the same as the second point mentioned above, with the price difference mainly in the battery protection board. The price difference of the battery protection board lies in the functional differences and component costs. Therefore, the price of lithium iron phosphate batteries with protective plates may vary greatly depending on different manufacturers. Anyway, when choosing lithium iron phosphate batteries, we need to first understand our actual needs and then choose the product that maximizes our economic benefits.

3、 Service life of lithium iron phosphate batteries

At present, the standard cycle life of lithium iron phosphate batteries on the market is around 2000 times, which refers to the ideal number for smooth and normal low current charging and discharging and application at room temperature. However, in reality, the actual cycle life of lithium iron phosphate batteries varies under different usage conditions. This mainly discusses the service life under several different usage scenarios.

1. Lithium iron phosphate batteries used at room temperature

(1) Small current charging and discharging

In this case, it is mainly used in 3C electronic products. If lithium iron phosphate batteries are used normally in this field, if the battery brand manufacturer has strong strength and good quality, they will have a cycle life of more than 2000 times; Small lithium battery manufacturers, even those with slightly lower quality, have a cycle life of over 1000 times;

(2) High rate stable charging and discharging use

The applications of high rate discharge are mostly power type lithium batteries, which are mostly used to provide power to electric motors, such as new energy vehicles, electric vehicles, fishing boat electromechanical power supplies, etc. Due to the fact that most lithium iron phosphate batteries operate under high load conditions, the degradation time of battery materials is accelerated, resulting in a sharp decrease in cycle life. Poor quality battery cells may only have about 500 cycles; A strong brand manufacturer of lithium iron phosphate batteries will have better equipment technology and material application, resulting in better battery cell quality, but the cycle life is only about 800 times.

(3) High rate unstable charging and discharging use

The lithium iron phosphate battery used in this situation will have a shorter lifespan, and will be scrapped after about 300 cycles. The unstable discharge of batteries, with varying times, will have a greater promoting effect on battery degradation.

2. Lithium iron phosphate batteries used in high-temperature environments

The high-temperature performance of lithium iron phosphate batteries is currently not very mature, with operating temperatures ranging from -20 ℃ to 125 ℃, which is a theoretical value, and the actual application temperature range is smaller.

(1) Small current charging and discharging

If lithium iron phosphate batteries are used normally in this field, if the battery brand manufacturer has strong strength and good quality, they generally have a cycle life of over 1000 times; Small lithium battery manufacturers, even those with slightly lower quality, have a cycle life of over 500 times; Because using it at high temperatures can cause significant damage to the battery.

(2) High rate stable charging and discharging use

The application of high rate discharge of batteries in high-temperature environments is mostly power type lithium batteries, which are mostly used to provide power to motors. The battery cells produced by strong domestic lithium battery manufacturers are mostly used in new energy vehicles, electric vehicles, fishing boat electromechanical power supplies, etc. The battery manufacturers with poor strength are mostly used in some relatively niche fields, such as medical and boiler equipment start-up. Due to the fact that most lithium iron phosphate batteries operate under high load conditions, the degradation time of battery materials is accelerated, resulting in a sharp decrease in cycle life. Poor quality battery cells may only have about 300 cycles; A strong battery brand manufacturer will have better equipment technology and material application, resulting in better battery cell quality, but the cycle life is only around 500 times.

(3) High rate unstable charging and discharging use

High temperature and unstable discharge rate operation cause greater damage to the battery and have a relatively low cycle life. Tests on battery cells from several battery factories have found that the battery can hardly be used after 250 to 300 cycles.

3. Low temperature use of lithium iron phosphate batteries

The impact of low temperature environment on the performance of lithium iron phosphate batteries is even greater than that of high temperature. Based on the current market situation, the lifespan of lithium iron phosphate batteries decreases significantly when operating below -20 ℃ to -40 ℃. The discharge current range is 0.2C to 1C, the discharge capacity is 50% to 60%, and the temperature is also low, resulting in poorer discharge capacity. Therefore, there are not many mature low-temperature lithium iron phosphate batteries in the market now, with a temperature range of -20 ℃ to 55 ℃ and a cycle life of about 300 times.

The above are the basic knowledge points on how to determine which brand of lithium iron phosphate battery is good, hoping to help everyone.

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