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Low-temperature preheating system for battery pack of electric vehicle and control method of low-temperature preheating system

An electric vehicle and battery management system technology, applied in the field of electric vehicle battery pack preheating, can solve the problems of battery heating, poor battery pack balance, and high failure rate, and achieve the effects of simple control, uniform preheating, and simple structure

Inactive Publication Date: 2016-03-02
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims to solve the problems of high cost, complex structure, difficult control, high failure rate or inability to uniformly heat the battery, resulting in poor balance of the battery pack when the battery is charged and used at low temperature

Method used

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  • Low-temperature preheating system for battery pack of electric vehicle and control method of low-temperature preheating system

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specific Embodiment approach 1

[0021] Specific implementation mode 1. Combination figure 1 Describe this embodiment, a low-temperature preheating system for an electric vehicle battery pack described in this embodiment, the system includes an electrothermal film 1, a relay set 3, a battery management system 4, a vehicle management system 5, a temperature sensor 6 and ground charging device 7;

[0022] An electrothermal film 1 is pasted on the outside of the outermost battery cells of the battery pack 2 and between every two adjacent rows of battery cells.

[0023] The battery management system 4 is used to collect the remaining power information of the battery pack 2, the remaining power signal output terminal of the battery pack of the battery management system 4 is connected to the battery pack remaining power signal input terminal of the vehicle management system 5, and the relay of the vehicle management system 5 The switch control signal output terminal is connected to the switch control signal input ...

specific Embodiment approach 2

[0026] Embodiment 2. This embodiment is a control method for the low-temperature preheating system of an electric vehicle battery pack described in Embodiment 1. The specific steps of the method are:

[0027] Step 1, using the temperature sensor 6 to collect the temperature T1 in the battery pack 2;

[0028] Step 2. The vehicle management system 5 judges whether the temperature T1 is greater than the target temperature T according to the temperature T1 in the battery pack 2 obtained in the step 1. g , if T1>T g , then go to step ten; otherwise go to step three; where, T g is a positive number;

[0029] Step 3. Use the battery management system 4 to collect the remaining power of the battery pack 2. The vehicle management system 5 judges whether the remaining power of the battery pack 2 is greater than the battery warm-up power threshold Q1. If the judgment result is yes, then perform step 4. If the judgment result is If no, go to step 7;

[0030] Step 4, the vehicle manage...

specific Embodiment approach 3

[0037] Specific Embodiment 3. This embodiment is a further description of the control method of the electric vehicle battery pack low-temperature preheating system described in Specific Embodiment 2. The temperature threshold T g is 10 degrees.

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Abstract

The invention relates to a preheating technology for a battery pack of an electric vehicle, in particular to a low-temperature preheating system for the battery pack of the electric vehicle and a control method of the low-temperature preheating system, and solves the problem of higher cost, complex structure, high control difficulty, high failure rate or poor balance of the battery pack due to failure of even heating of batteries during charge and use of the batteries at the low temperature. Electro-thermal films are attached on outer sides of the outermost row of cells of the battery pack as well as between every two adjacent rows of cells, a battery pack residual capacity signal output end of a battery management system is connected with a battery pack residual capacity signal input end of a whole vehicle management system, a power supply signal input end of a relay set is connected with a power signal output end of the battery pack, and the relay set correspondingly controls power supply switches of the electro-thermal films; a battery charge control signal output end of the whole vehicle management system is connected with a charge control signal input end of a ground charge device, and the ground charge device charges the battery pack. The system is applicable to preheating of batteries of the electric vehicle.

Description

technical field [0001] The invention relates to a technology for preheating battery packs of electric vehicles. Background technique [0002] Lithium-ion batteries are gradually replacing other batteries as the main power batteries due to their advantages such as high specific power, high energy density, long life, low self-discharge rate and long storage time. Although lithium-ion batteries have many advantages, there are still major problems in the charging and discharging performance of lithium-ion batteries at low temperatures, such as: the activity of various active materials is reduced, the reaction rate of the battery electrode is low, and the graphite negative electrode inside the lithium-ion battery All kinds of impedances have increased significantly, and the use of lithium-ion batteries is difficult. At the same time, lithium batteries tend to precipitate metal lithium on the graphite negative electrode during low-temperature charging, forming dendrites. The form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/635H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 吴晓刚陈喆胡宸陈景夫
Owner HARBIN UNIV OF SCI & TECH
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