Battery Charging Process

During the charging of lithium iron phosphate (LiFePO4) batteries, lithium ions detach from the positive electrode (LiFePO4) and migrate through the electrolyte to the negative electrode (graphite). The hexagonal honeycomb structure of graphite allows lithium ions to be intercalated, where they are stored until released during the discharge phase to produce energy.

在磷酸铁锂 (LiFePO4) 电池充电过程中，锂离子会脱离正极 (LiFePO4)，并通过电解质迁移到负极 (石墨)。石墨的六边形蜂窝结构允许锂离子嵌入其中，它们被储存在那里，直到放电阶段释放出来产生能量。

The total amount of lithium ions within the battery remains constant and does not increase; however, they can be consumed during each charging cycle. When temperatures rise, the electrolyte is prone to thermal decomposition, leading to byproducts that chemically interact with lithium ions to form an SEI film on the negative electrode. As a result, fewer lithium ions are available for storage in the negative electrode, contributing to the substantial energy loss during charging in high-temperature conditions. Moreover, this loss of lithium ions is irreversible, leading to a reduction in the battery’s maximum capacity.

电池内的锂离子总量保持不变，不会增加；但是，它们会在每个充电周期中被消耗掉。当温度升高时，电解质容易发生热分解，产生的副产物与锂离子发生化学反应，在负极上形成 SEI 膜。因此，负极中可存储的锂离子更少，导致高温条件下充电时能量损失显著。此外，锂离子的损失是不可逆的，导致电池的最大容量降低。

Cycle Life and Performance

When discussing battery lifespan, the concept of cycle count is crucial. This metric measures the battery’s longevity and performance based on the complete charge-discharge cycles it undergoes. The solar light batteries we use at GCOTS typically have a cycle count ranging from 1,500 to 2,000. However, if lithium ions are significantly depleted due to prolonged exposure to high temperatures, the degradation of the battery’s lifespan accelerates, resulting in a reduced actual cycle count.

讨论电池寿命时，循环次数的概念至关重要。该指标根据电池经历的完整充电放电循环来衡量电池的寿命和性能。我们在 GCOTS 使用的太阳能电池的循环次数通常在 1,500 到 2,000 之间。但是，如果锂离子因长时间暴露在高温下而严重耗尽，电池寿命的下降会加速，导致实际循环次数减少。

To extend the battery’s lifespan, it is essential to operate within more ideal temperature conditions. To address this, we have developed a new battery box solution applicable to all split type and some all-in-one solar street lights. Below is the initial version of the battery box. The metal casing will be produced using a high-temperature electrostatic spraying process to provide protection and enhance aesthetics.

为了延长电池的使用寿命，必须在更理想的温度条件下运行。为了解决这个问题，我们开发了一种新的电池盒解决方案，适用于所有分体式和部分一体式太阳能路灯。以下是电池盒的初始版本。金属外壳将采用高温静电喷涂工艺生产，以提供保护并增强美观度。

The box is made from sheet metal, shaped through bending techniques, which offers cost advantages over aluminum, as it eliminates the need for molds. Its high plasticity allows it to accommodate solar panels of any size by easily adjusting the dimensions of the box.

箱子是钣金材料，采用折弯技术塑形，相比铝材成本低，不需要开模，可塑性强能匹配任意尺寸的光伏板，随意放大或者缩小箱子的空间。

With its larger unsealed space and increased convection holes, this new design can reduce battery temperature significantly compared to traditional approaches. We have conducted some relevant tests and expect that in actual applications this design can help reduce the battery operating temperature by more than 10 degrees Celsius.

与传统方法相比，这种新设计拥有更大的非密封空间，且增加了对流孔，可以极大降低电池温度。我们进行了相关的一些测试，预计在实际应用中这款设计能帮助电池工作温度下降10摄氏度以上。

Below is part of the test results. For detailed test content, please contact us for business communication.

下方是测试结果的部分内容，详细的测试内容请联系我们业务沟通。