Light-operated low-temperature protection device for lithium battery pack and low-temperature protection method used therein

Abstract

The invention relates to a light-operated low-temperature protection device for a lithium battery pack and a low-temperature protection method used therein. The light-operated low-temperature protection device comprises an encapsulating shell, a solar cell panel, an intelligent controller, a heat-insulation layer, a lithium battery pack, a battery protection plate, a temperature controller and a heat-conducting aluminum plate, wherein the lithium battery pack, the battery protection plate, the temperature controller and the heat-conducting aluminum plate are wrapped by the heat-insulation layer to form an integral lithium battery group; the solar cell panel is electrically connected with the light-operated signal input terminal of the intelligent controller via a lead; the temperature controller and the intelligent controller are both via electrically connected with the positive pole and the negative pole of the battery protection plate via leads; the positive electrode and the negative electrode of the lithium battery pack are connected with the battery protection plate; and the temperature controller is provided with a temperature sensor and a heating element. The light-operated low-temperature protection device only carries out low-temperature protection on the lithium battery pack during charging of the lithium battery pack in daytime, so the service life and durability of the lithium battery pack are effectively improved, and unnecessary energy loss of the lithium battery pack is prevented.

Description

Technical field [0001] The invention relates to the technical field of low-temperature protection of lithium battery packs for solar street lamps, and specifically relates to a light-controlled lithium battery pack low-temperature protection device and a low-temperature protection method for solar street lamps. Background technique [0002] Lithium-ion batteries (lithium batteries for short) have high voltage, high specific energy and excellent cycle life, are safe and pollution-free, and are called green power sources. With the successful development of high-capacity lithium manganate batteries and the maturity of technology, there are more and more projects using lithium batteries in the solar battery field. The application of solar batteries not only plays an important role in remote areas and areas with temporary power shortages, but also in other areas. It has also been rapidly popularized in various industries such as transportation, construction, agriculture and forestry, ...

AI Technical Summary

Problems solved by technology

[0003] However, since the normal operating temperature of the lithium battery pack used in the existing lithium battery solar street lights is between 10-40°C, and the lithium battery cell has a high temperature requirement when charging, but there is no requirement when discharging, That is, the charging and discharging of lithium battery packs have different requirements on the ambient temperature. When charging lithium battery packs, a temperature environment higher than 0°C is required, otherwise the inside of the lithium battery pack is prone to crystallization. When the temperature drops to 0°C, the charging capacity of the lithium battery pack can only reach About 75%, the discharge efficiency is less than 90%, which greatly affects the service life and durability of lithium battery packs

The disadvantage of this lo

Images