Energy-saving heating device for lithium battery pack

Abstract

The invention discloses an energy-saving heating device for a lithium battery pack, and belongs to the technical field of lithium battery heating. Lithium batteries in the prior art are poor in heating effect, uniform heating of each lithium battery is difficult to guarantee, and potential safety hazards and energy wasting exist due to local overheating of the lithium batteries. The energy-saving heating device for the lithium battery pack comprises a heating component used for heating the lithium batteries and a power supply control module connected with the heating component; all wire parts winding the lithium batteries are mutually independent and are connected with the power supply control module respectively, according to differences of temperatures of all areas of the lithium battery pack, different voltages can have access to the wire parts of all the areas through a control chip, and heating parts of all the areas are controlled to generate heat; the corresponding wire parts are deenergized in time according to the temperature variation conditions of the lithium batteries; it is guaranteed that the lithium battery pack is heated uniformly, the heating efficiency is high, the energy is saved, the structure is simple and reasonable, the situation that local temperature is too high is avoided, and the potential safety hazards are prevented.

Description

technical field [0001] The invention relates to an energy-saving heating device for a lithium battery pack, belonging to the technical field of lithium battery heating. Background technique [0002] As a representative of new energy, lithium batteries are widely used in many fields. However, due to the inherent characteristics of lithium battery materials, it has very strict requirements on the operating environment temperature. At present, it is difficult to achieve normal high-current start-up and discharge at both high and low temperatures. The actual discharge performance of lithium batteries at low temperatures is far lower than that at room temperature, and it decreases as the temperature drops. In low temperature and severe cold areas, especially when the temperature drops to 0°C, the lithium battery can only be charged to 70%-75% of the capacity, and the discharge is less than 90%. When the temperature is lower than 0°C, the lithium battery For electric vehicles po...

AI Technical Summary

Problems solved by technology

In low temperature and severe cold areas, especially when the temperature drops to 0°C, the lithium battery can only be charged to 70%-75% of the capacity, and the discharge is less than 90%. When the temperature is lower than 0°C, the lithium battery For electric vehicles powered by the group, the battery cannot be charged and discharged or the charging and discharging capacity is extremely low, affecting the normal start of the vehicle or shortening the cruising range of the vehicle

One electrothermal film is used to heat multiple lithium batteries. When the temperature of a local lithium battery rises, the resistance value of the PTC electric heating film becomes larger, and the heat production of the PTC electric heating film in other positions decreases, resulting in poor heating effect of other lithium batteries. At the same time, only wrapping On the three sides of the lithium battery, it is difficult to ensure that each lithium battery is heated evenly, and local overheating of the lithium battery will have certain safety hazards

And because the lithium batteries are arranged at intervals to form a lithium battery pack, the heat generated by the electrothermal film arranged between the two lithium batteries is directly exposed to the air, resulting in low heating efficiency and wasting a lot of energy

If each lithium battery uses a separate heating film, it will lead to a complicated and bulky lithium battery heating device, and it is difficult to ensure the safety performance of the heating device

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