Lithium ion secondary battery having self-heating function

Abstract

The invention discloses a lithium ion secondary battery having a self-heating function. The lithium ion secondary battery comprises a battery cell, an outer package and electrolyte; the outer package is used for encapsulating the battery cell; the electrolyte is filled in the outer package; a cathode and an anode are leaded out on the battery cell; a metal foil positioned at one side of the battery cell is also arranged in the outer package; the metal foil is provided with a third pole; and the third pole and the anode can be connected or disconnected. After the above structure is adopted, short-circuiting between the cathode and the anode can be caused by connection between the third pole of the metal foil and the anode in a low-temperature condition; heating can be caused when relatively large current passes through the metal foil instantly, so that the internal temperature of the battery is improved better; relatively high capacity of the lithium ion battery in a low-temperature environment can be ensured; furthermore, due to the internally insulated metal foil, the heat production efficiency is far greater than that in an external heating manner; furthermore, the internal temperature rising uniformity of the battery is better; the cost of the battery is also reduced; the energy density of the battery is increased; and in addition, the lithium ion secondary battery also can be suitable for different environmental temperatures better.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery with self-heating function. Background technique [0002] With the increasing use of electronic products, soft-pack lithium-ion batteries have the advantages of light weight, large capacity, and high energy density. They are widely used in various fields such as cameras, notebooks, and mobile phones. The existing lithium-ion secondary batteries are generally It is composed of the casing, the electrolyte in the casing, and the battery cell. However, as we all know, the use of lithium-ion batteries is greatly affected by the ambient temperature. Usually, its capacity cannot be exerted in a low-temperature environment, especially in cold winters, which often makes lithium-ion batteries It is difficult to maintain effective use of ion batteries. In the prior art, external heating is usually used to increase the capacity, which makes the cost high and ...

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Problems solved by technology

[0002] With the increasing use of electronic products, soft-pack lithium-ion batteries have the advantages of light weight, large capacity, and high energy density. They are widely used in various fields such as cameras, notebooks, and mobile phones. The existing lithium-ion secondary batteries are generally It is composed of the casing, the electrolyte in the casing, and the battery cell. However, as we all know, the use of lithium-ion batter

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