Lithium ion battery internal temperature monitoring method

A lithium-ion battery and internal temperature technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems that the temperature control of lithium-ion batteries cannot provide accurate information, cannot be applied in real vehicles, and has a large amount of calculation. The test method is simple and fast, the calculation method is simple and easy, and the effect of real-time monitoring is satisfied

CN105206888AInactive Publication Date: 2015-12-30ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
2 Cites 89 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-12-30
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a lithium ion battery internal temperature monitoring method. The monitoring method includes the following steps that a charge-discharge tester is used for carrying out charge-discharge tests on a lithium ion battery on different environment conditions to obtain a battery surface temperature change curve; related parameters such as battery internal resistance and an open-circuit voltage temperature coefficient are tested, and a lithium ion battery electric heating coupling model based on a variable heat production rate is set up; the temperature rise change of the discharge process of the battery is simulated to obtain a temperature change simulation curve; the experiment test temperature change curve and the simulation curve are analyzed and compared to optimize and verify the electric heating coupling model; the influence between the battery internal temperature and the battery surface temperature as well as the influence between the discharge currents and the discharge depth are analyzed, and a lithium ion battery internal temperature model is constructed; the battery internal temperature is monitored in real time according to the model. The lithium ion battery internal temperature monitoring method is simple and easy to implement, small in estimation error and capable of well meeting the requirement for monitoring the battery internal temperature in real time.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and more specifically, relates to a method for monitoring the internal temperature of a lithium ion battery. Background technique

[0002] Lithium-ion batteries appeared in the early 1990s. In just over two decades, lithium-ion battery technology has achieved unprecedented development. At present, the performance of lithium-ion batteries is better than that of lead-acid batteries and nickel-hydrogen batteries in terms of specific energy, specific power, working voltage and service life, and has gradually become the development direction of power batteries. With the improvement of the safety performance and low-temperature discharge performance of lithium-ion batteries, more and more electric vehicles use lithium-ion power batteries as power sources, showing very broad application prospects. However, as a chemical power source, lithium-ion batteries are accompanied by complex chemical an...

Examples

Embodiment 1

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the drawings and the description of the implementation examples. The process of the method for monitoring the internal temperature of the lithium ion battery of the present invention is as follows figure 1 Shown:

[0036] 1) First, use the charge and discharge tester to perform charge and discharge experiments under different environmental conditions (different environmental conditions including ambient temperature, different charge and discharge rates, and heat dissipation coefficient conditions) of the lithium-ion battery to be tested, and close multiple temperature sensors to the cell On the surface of the battery, measure the surface temperature change curve of the lithium ion battery during charging and discharging; the sample selected in this embodiment is a 3.2V / 20Ah lithium iron phosphate battery with a discharge cut-off voltage of 2.5V, a charge cut-off vol...