A low-temperature high-power output auxiliary device for a portable battery pack

Abstract

Provided is a low-temperature high-power output auxiliary apparatus for a portable battery pack, comprising a primary loop and a control unit, wherein the primary loop is arranged as a working loop of the battery pack, comprising a power resistor; two ends of the power resistor are electrically connected to a positive electrode and a negative electrode of the battery pack respectively; the battery pack performs current discharge via the power resistor at a low temperature, so that the temperature inside the battery pack rises; and the control unit is used for controlling the ON and OFF of the primary loop. According to the auxiliary apparatus of the present invention, by means of arranging a primary loop as a working loop of a battery pack, the battery pack performs current discharge via a power resistor, thereby realizing rapid auto-thermal temperature rising of the battery pack, and a high-power output capability of the battery pack is recovered within a short time in a low-temperature situation; moreover, by means of arranging a control unit to control the ON and OFF of the primary loop, the total amount of energy released by the battery pack is effectively controlled, and too large a temperature rising of the auxiliary apparatus is prevented at the same time.

Description

technical field [0001] The invention relates to a battery pack auxiliary device, in particular to a portable battery pack low-temperature high-power output auxiliary device which requires the battery pack to output high power even under low temperature conditions. Background technique [0002] With the advancement of chemical battery pack technology, the specific energy of its energy storage has increased rapidly, and the unit cost has gradually decreased. In addition, the battery pack itself has the characteristics of fast response and convenient setting, making the application of battery packs more and more extensive. . As an energy supply device in digital products, it has the characteristics of portability and high energy density. In the connection of new energy (such as wind power generation, solar photovoltaic power generation) as an energy buffer device, smooth new energy and increase the penetration rate of new energy; as a braking energy recovery device in automobi...

AI Technical Summary

Problems solved by technology

For example, the battery pack used in EV, in order to make the battery pack can still work normally at low or high temperature, usually a thermal management device (such as an air conditioner) is set around the battery pack, but this method of controlling the ambient temperature of the battery pack often has The problem of high thermal management cost and low thermal management efficiency

[0005] At the same time, in some occasions where the battery pack is required to meet high power output conditions (such as car start-up and ignition), since the battery pack is required to output a large power in a short period of time (~3S), it is impossible to pass the external Heating to make the battery pack itself reach a temperature capable of high power output work, on the one hand, it takes a long time, and also consumes a lot of energy stored in the battery pack; and there is a hidden danger of temperature imbalance of the battery pack itself through external heating (Prolonging the heating time can improve this hidden danger, but if the time is too long, it will make it meaningless to meet the application requirements, that is, it is impossible for users to accept such a long waiting time)

Furthermore, for occasions that require low temperature and high power output, it can be improved by optimizing the design of the battery pack, but by changing the chemical system of the battery pack itself, it often leads to a substantial increase in the cost of the battery pack or a significant decline in other performances (e.g. reduced high temperature performance of the battery pack)

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