Lithium ion battery

Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises a battery main body and at least one semiconductor chilling plate; the semiconductor chilling plate is arranged on the outer surface of the battery main body; and the semiconductor chilling plate is provided with a first connection terminal and a second connection terminal, wherein the first connection terminal is electrically connected with the positive pole or the negative pole of the battery main body, and the second connection terminal is non-occupied. The outer surface of the battery main body of the lithium ion battery is provided with a semiconductor chilling plate; the semiconductor chilling plate is connected with the battery main body when in use; and the semiconductor chilling plate cools or heats the battery main body, thus, the lithium ion battery has the function of temperature regulation. When the semiconductor chilling plate works, the power supply is supplied by the battery main body or the direct-current power supply in the charging circuit, therefore, no external power supply is required, and the use is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently the mainstream products in the field of power and energy storage power supplies, ranging from electric buses, electric cars, to small cameras, mobile phones, etc. Reports of explosions and explosions in lithium-ion batteries have dealt a severe blow to the confidence of consumers and regulators. [0003] The main cause of safety problems such as fire and explosion of lithium-ion batteries is that in addition to the thermal runaway caused by the internal short circuit of the battery cell, the other is the thermal runaway caused by the structural change of the internal material of the battery caused by the excessive local temperature rise of the battery, and the excessively high The discharge temperature will also accelerate battery aging and induce safety hazards. At present, t...

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Problems solved by technology

[0003] The main cause of safety problems such as fire and explosion of lithium-ion batteries is that in addition to the thermal runaway caused by the internal short circuit of the battery cell, the other is the thermal runaway caused by the structural change of the internal material of the battery caused by the excessive local temperature rise of the battery, and the excessively high Discharge temperature will also accelerate battery aging and induce safety hazards

At present, there are two main methods of external heat dissipation and cooling for lithium-ion batteries. One is to absorb and store the heat generated during the discharge process of lithium-ion batteries through a high-heat-capacity conductive medium, so as to accelerate the heat dissipation of the battery and prevent the local temperature of the battery from being too high. Out of control; one is air circulation heat dissipation or air cooling heat dissipation, this method has limited heat dissipation capacity, has many limitations, poor effect, and small application range

These two methods are to carry out the overall heat dissipation design after the single cells are combined into a battery module. When the battery module is larger and the number of single cells is larger, the heat dissipation effect of the battery pack is worse. The battery at the center of the battery pack The worse the heat dissipation effect of the core, the greater the temperature difference of the single cell, resulting in a greater difference in the discharge characteristics of a single battery. Therefore, the larger the battery pack, the worse the cycle performance of the combined batteries. It can be seen that the existing technology The heat dissipation of the lithium-ion battery pack has been realized, but the heat dissipation and cooling of a single lithium-ion battery have not been realized

[0004] In addition, when lithium-ion batteries are used, they will also face changes in the external environment, which will cause their functional efficiency to decrease. For example, when they are used at low temperatures, lithium-ion batteries cannot be discharged or charged normally because the temperature is too low. The battery can only be used in a higher temperature room or after heating and heat preservation treatment, which will also have a potential impact on the service life and safety of the battery

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