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A battery pack parallel charging control method and device

A charging control method and charging control technology, which are applied in battery/fuel cell control devices, electric vehicles, transportation and packaging, etc., can solve problems such as battery damage, high current of branch batteries, and excessive current of branch batteries, and achieve improved Long service life, reasonable control of segmented constant current charging, and the effect of avoiding damage to battery cells

Active Publication Date: 2020-07-10
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a battery pack parallel charging control method and device to solve the problem that the existing constant current charging method cannot judge whether to carry out the next stage of constant current according to the actual current on the branch when charging the parallel battery pack. Charging, causing the branch battery current to be too high and causing battery damage
[0005] In order to realize the reasonable control of battery pack parallel section constant current charging, solve the problem that the existing constant current charging method cannot judge whether to carry out the next stage of constant current charging according to the actual current on the branch circuit when charging the parallel battery pack, resulting in The problem of battery damage caused by excessive battery current

Method used

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  • A battery pack parallel charging control method and device
  • A battery pack parallel charging control method and device
  • A battery pack parallel charging control method and device

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Embodiment 1

[0024] The present invention provides a battery pack parallel charging circuit topology, at least one battery cell constitutes a battery unit, such as figure 2 As shown, taking 4 battery units and each battery unit contains a battery unit as an example, but the topology is not limited to this, and more battery units can also be set, and each battery unit is connected to the bus through a branch. To form a parallel connection, a relay is set on the branch of the battery unit, and a relay can be set, or as figure 2 Three relays are set as shown, for example, S1, S2 and S9; at the same time, a temperature collector for detecting the temperature of any relay on the branch is also set on the branch of each battery unit; or a temperature collector is also set on the branch of each battery unit There is a current collector used to detect the current on the branch; to realize the acquisition of temperature or current.

[0025] In addition, each battery unit is also connected in ser...

Embodiment 2

[0035] The invention provides a battery pack parallel charging control method, such as Figure 4 As shown, in order to make the segmental constant current control more accurate, the voltage value of each battery cell is also obtained during the segmental constant current charging control process, and it is judged whether each voltage value is not less than the corresponding cut-off voltage value of the current stage. If not, then perform the following steps:

[0036] 1) In the current constant current charging stage, obtain the branch current information or the temperature information of the relay on the charging branch of each battery unit;

[0037] 2) Judging whether the branch current is greater than the current threshold in the current constant current charging stage according to the branch current information, or judging whether the temperature rise rate of the relay is greater than the rate threshold in the current constant current charging stage according to the tempera...

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Abstract

The invention relates to the field of battery charging control, in particular to a battery pack parallel charging control method and device. Branch circuit current information of each battery unit charging branch circuit or temperature information of a relay is obtained. When the current of the branch circuits is larger than a current threshold in the current constant-current charging stage or when the heating rate of the relay is larger than a rate threshold under the current constant-current charging stage, it is judged that the current constant-current charging stage is not a final constant-current charging stage, and the device is controlled to enter the next constant-current charging stage. By judging the branch current of the battery unit charging branch circuits or the temperature change condition of the relay, whether the current constant-current charging stage is completed or not is judged so that whether next stage of constant-current charging is started or not can be judgedaccording to the actual current magnitude condition on the branch circuits, the situation that a battery in a battery cell is damaged due to excessively high current of one certain or some battery cell charging branch circuits is avoided, segmented constant-current charging control is more reasonable, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of battery charging control, in particular to a battery pack parallel charging control method and device. Background technique [0002] With the gradual deterioration of the global climate, the intensification of urban air pollution and the excessive consumption of oil resources, the development of energy-saving and environmentally friendly vehicles has become an important direction of technological innovation in the world's automotive industry and an inevitable choice for the sustainable development of the automotive industry. The development of new energy vehicles is gradually expanding. The types of power batteries currently used in new energy vehicles include: lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries and lithium batteries. The main factors affecting the performance and life of power batteries include battery temperature, battery internal resistance, and consistency of single ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/18
CPCY02T10/70
Inventor 姚雷侯俊剑张志刚陈向田李志强翟洪飞房占鹏王新生
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY