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Battery pack charging method, apparatus and equipment
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A charging method and a technology of a charging device, which are applied in battery/fuel cell control devices, secondary battery charging/discharging, secondary batteries, etc., can solve the problem of power battery service life decay, battery cell safety risk increase, and unfavorable new energy vehicles. Development and other issues to achieve the effect of improving the service life
Active Publication Date: 2017-11-17
CONTEMPORARY AMPEREX TECH CO
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However, the existing charging piles charge all the modules or cells in the battery pack to the same charging cut-off voltage, which will inevitably cause overcharging of some battery packs composed of modules or cells connected in series.
[0004] Overcharging of battery cells will lead to a rapid decline in the service life of the power battery, and at the same time lead to an increase in the safety risk of the battery cells in the battery pack, which is not conducive to the development of new energy vehicles
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specific Embodiment 1
[0076] A battery pack of a ternary system is selected, and the structure of the battery pack is a series branch of battery modules. Specifically, the battery pack is composed of four battery modules with the same structure connected in series, and the theoretical cut-off voltage of the battery modules may be, for example, 25.5V.
[0077] Set a set of successively decreasing charging current values {200A, 150A, 100A, 50A, 20A} during the charging process of charging the battery pack, place the battery pack in a charging environment of 25 degrees Celsius, and charge the battery pack discharge;
[0078]The DCR of the 4 battery modules in the battery pack are 4.5mohm, 5.1mohm, 4.2mohm, 4.7mohm respectively, among them, the DCR of the battery modules in the battery pack 1max is 5.1mohm, using the above formula (1) to calculate the charging cut-off voltage corresponding to the charging current value of each charging stage {24.48V, 24.74V, 24.99V, 25.29V, 25.37V}.
[0079] Figu...
specific Embodiment 2
[0095] A ternary system battery pack is selected, and the structure of the battery pack is a series branch of cells. Specifically, the battery pack is composed of five cells connected in series, and the theoretical cut-off voltage of the cells can be, for example, 4.25V.
[0096] Set a set of successively decreasing charging current values {60A, 40A, 20A, 5A} during the charging process of charging the battery pack, place the battery pack in a charging environment of 25 degrees Celsius, and charge and discharge the battery pack;
[0097] The DCR of the 5 cells in the battery pack are 1.2mohm, 1.1mohm, 1.4mohm, 1.5mohm and 1.6mohm respectively. Among them, the DCR of the cells in the battery pack 2max is 1.6mohm, and the charging cut-off voltage {4.15V, 4.19V, 4.22V, 4.24V} corresponding to the charging current value of each charging stage is calculated by using the above formula (2).
[0098] Figure 4a A schematic diagram showing a battery pack charging process in a speci...
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Abstract
The invention discloses a battery pack charging method, apparatus and equipment. The battery pack charging method comprises the steps of setting a charging current value I<n> in each charging stage of a charging process; when the structure of the battery pack is a series branch of a battery module, calculating a charging cut-off voltage value corresponding to I<n> in the n charging stage based on the maximum internal resistance value of the battery module; when the structure of the battery pack is a series branch of a cell, calculating a charging cut-off voltage value corresponding to I<n> in the n charging stage based on the maximum internal resistance value of the cell; and in the (n-1) charging stage, charging the battery pack by I<n-1>, when the charging voltage of the battery pack reaches V<n-1> and when (n-1) is smaller than the set total number of charging stages, entering the n charging stage, and when the charging voltage of the battery pack reaches V<n-1> and when (n-1) is equal to the set total number of charging stages, stopping charging. By virtue of the battery pack charging method provided by the embodiments, battery pack charging safety can improved, and the service life of the power battery can be prolonged.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a battery pack charging method, device and equipment. Background technique [0002] As we all know, power batteries are the heart of new energy vehicles, and the life and safety performance of power batteries play a vital role in new energy vehicles. [0003] The power battery pack can be formed by combining multiple battery modules in series and parallel, or by combining multiple battery cells in series and parallel, and the resistance between different battery cells or different battery modules has certain differences. However, the existing charging piles charge all the modules or cells in the battery pack to the same charging cut-off voltage, which will inevitably cause overcharging of some battery packs composed of modules or cells connected in series. [0004] Overcharging of batteries will lead to a rapid decline in the service life of the power battery, and at the same ...
Claims
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