Operating method of battery pack of electric locomotive

A working method and technology of electric locomotives, applied in the field of rail transit, can solve problems such as practical discounts and cost increases, and achieve the effects of prolonging life, improving life, and large balanced current

Inactive Publication Date: 2015-08-26
株洲中车电气科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are that a large number of power devices are used as switching elements, and the second is that a certain proportion of redundant batteries (about 20%) is required, which leads to a sharp increase in the cost of the entire battery pack and greatly reduces the practicability

Method used

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  • Operating method of battery pack of electric locomotive
  • Operating method of battery pack of electric locomotive

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Embodiment Construction

[0028] The working method of a battery pack of an electric locomotive according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] The core point of the present invention is to use power electronic technology to extract part of the energy from the whole group of batteries to replenish the battery with low capacity, so as to realize low cost and strong compensation ability, and increase the life of the group of batteries to the level close to that of a single battery.

[0030] The circuit principle of the present invention is: the whole circuit is similar to a switching power supply, and the actual output power of the switching power supply depends on the magnitude of the charging or discharging current on RC2. The circuit judges that the battery is in three states of charging, discharging and disconnecting according to the positive and negative current on RC2. The N secondary and rectifying circuits of the high-fre...

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Abstract

The invention discloses an operating method of a battery pack of an electric locomotive. A circuit in the method comprises a multi-way high-frequency transformer, a high-frequency rectification loop and additional charging circuits; during charging, charging current is distributed to the additional charging circuits of single batteries; the distributed charging current depends on the magnitude of voltage of each single battery, i.e., the higher the voltage of each single battery is, the lower the obtained charging current is, and the lower the voltage of each single battery is, the higher the obtained charging current is; during discharging, the additional charging circuits distribute additional current to the single batteries; the higher the voltage drop speed of each single battery is, the higher the obtained additional current is, and the lower the voltage drop speed of each single battery is, the lower the obtained additional current is. With the adoption of the method, high-current non-dissipative equalization can be achieved in charging and discharging processes of the battery pack; the consistency of the batteries within a life cycle is ensured to the greatest extent; the whole battery pack can still operate normally when few batteries have faults; and the service life of the battery pack is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a working method for a battery pack of an electric locomotive. Background technique [0002] Electric locomotive batteries work in series, and Harmony locomotives have a single 2V series of 48 batteries. Shaoshan locomotive has a single 1.2V battery with a total of 74 batteries in series. Due to its individual inconsistency, there is a difference in capacity, and the difference in capacity will gradually increase during the charging and discharging process. Eventually, the life of individual batteries expires early and the entire battery pack is scrapped. [0003] In order to solve the above problems, people have done a lot of work, mainly in the following ways: [0004] 1. Balanced charging: When charging in series, control the charging voltage through the discharge circuit connected to each battery to make it consistent with the charging voltage of other batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/44H02J7/00Y02E60/10
Inventor 施宇飞何向东屈大卫
Owner 株洲中车电气科技有限公司
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