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A low-temperature self-heating device, method, and ripple suppression method for a power battery

A power battery and self-heating technology, which is applied in battery circuit devices, battery/fuel cell control devices, circuit devices, etc., can solve problems such as excessive ripple and reduced service life of power batteries, so as to improve service life and reduce volume and cost, the effect of suppressing the charge and discharge ripple current

Active Publication Date: 2022-02-11
SHENZHEN VMAX NEW ENERGY CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of reduced service life of the power battery and excessive ripple in the charging and discharging process of the power battery caused by the sudden drop in performance of the power battery at low temperature in the prior art, the present invention proposes a low-temperature self-heating device, method and ripple for the power battery. wave suppression method

Method used

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  • A low-temperature self-heating device, method, and ripple suppression method for a power battery
  • A low-temperature self-heating device, method, and ripple suppression method for a power battery
  • A low-temperature self-heating device, method, and ripple suppression method for a power battery

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Embodiment Construction

[0042] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. Wherein, the same or similar labels represent the same or similar elements or have the same or similar elements; those skilled in the art can easily understand the usual operations in the circuit, such as connecting resistance to change current / voltage adaptation, and in specific embodiments Do not describe. The embodiments described below by referring to the figures are illustrative only for explaining the present invention and cannot be construed as limiting the present invention.

[0043] figure 1 A typical power battery equivalent model is shown, which is the Thevenin model, which is a first-order RC (resistance-capacitance) model, usually used for power battery SOC (state of charge, representing the remaining power in the battery, Indicated by the ratio of the remaining power to the capacity of the battery) for online real-time estimation. ...

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Abstract

The invention discloses a power battery low-temperature self-heating device, method and ripple suppression method. The power battery low-temperature self-heating device includes: a power battery and a bidirectional converter compensation device, and the bidirectional converter compensation device includes an energy storage element , a bidirectional converter and a bidirectional converter control circuit, the bidirectional converter is arranged between the energy storage element and the power battery, the bidirectional converter control circuit is used to control the bidirectional converter in charging mode and The discharge mode is switched. In the charging mode, the energy of the power battery charges the energy storage element through the bidirectional converter; in the discharge mode, the energy flows from the energy storage element to the power battery through the bidirectional converter. The invention can realize the self-heating function of the power battery at low temperature, and can effectively reduce the charge and discharge ripple voltage and ripple current when the power battery is charged and discharged, thereby improving the service life of the battery.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a power battery low-temperature self-heating device, method and ripple suppression method. Background technique [0002] With the rapid development and widespread use of electric vehicles, research on the charging of power batteries and their low-temperature characteristics has become a hot topic. The performance of the power battery will be greatly attenuated at low temperature. Take the ternary lithium battery currently used in the market as an example: charging at low temperature will cause irreversible damage to the battery, and discharging at low temperature will significantly attenuate its capacity. In order to prolong the service life of the battery, the battery is usually heated by external heating at low temperature. The traditional heating methods are mainly divided into air convection heating, cooling liquid convection heating, and resistance wire heating. Both air an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/27B60L58/10H01M10/615H01M10/625H01M10/637H02J1/02H02J7/00H02M3/00
CPCB60L58/27B60L58/10H01M10/615H01M10/625H01M10/637H02J1/02H02J7/0068H02M3/00Y02E60/10Y02T10/70Y02T10/72
Inventor 冯颖盈姚顺冯仁伟
Owner SHENZHEN VMAX NEW ENERGY CO LTD
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