An internal heating method suitable for power battery packs

A technology for power battery packs and power batteries, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as uneven preheating, and achieve uniform heating effects

Active Publication Date: 2022-03-04
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that an additional preheating circuit needs to be added and the preheating is uneven in the external preheating method used by most of the existing power battery preheating, and proposes an internal heating method suitable for power battery packs

Method used

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  • An internal heating method suitable for power battery packs
  • An internal heating method suitable for power battery packs
  • An internal heating method suitable for power battery packs

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0019] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, an internal heating method suitable for a power battery pack described in this embodiment, the power battery pack described in this method includes an even number of power batteries inside, and each two groups of power batteries are a self-heating unit, The charging and discharging signal terminals of one group of power batteries of each heating unit are connected to the signal input and output terminals on one side of the bidirectional DC / DC converter 2, and the charging and discharging signal terminals of the other group of power batteries are connected to the other side of the bidirectional DC / DC converter 2. side signal input and output terminals;

[0020] No. 1 sampling circuit 1 and No. 2 sampling circuit 3 are respectively used to collect the temperature, terminal voltage, internal current of the power battery and the state of charge of the power battery ...

specific Embodiment approach 2

[0028] Specific implementation mode two: the following combination image 3 Describe this embodiment. This embodiment will further explain an internal heating method suitable for power battery packs described in Embodiment 1. The first-order Thevenin equivalent circuit model described in step 3 includes the ohmic internal resistance R 0 , Polarization resistance R 1 , Polarized capacitance C 1 and open circuit equivalent voltage source U OC ;

[0029] Ohm internal resistance R 0 One end of the connection is connected to the positive pole of the charging power supply, and the ohmic internal resistance R 0 The other end of the polarized capacitor C is connected at the same time 1 one end and the polarization resistance R 1 One end of the polarized capacitance C 1 The other end of the polarizing resistor R 1 The other end of the open circuit equivalent voltage source U OC The positive pole of the open circuit equivalent voltage source U OC The negative pole of the batte...

specific Embodiment approach 3

[0030] Specific embodiment three: This embodiment further explains an internal heating method suitable for power battery packs described in embodiment two. The formula of the first-order Thevenin equivalent circuit model described in step three is:

[0031]

[0032] Among them, R 0 is the ohmic internal resistance, R 1 is the polarization internal resistance, C 1 is the polarized capacitance, U OC is the open circuit voltage of the lithium-ion battery, U is the terminal voltage of the lithium-ion battery, and s is the complex frequency.

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Abstract

An internal heating method suitable for a power battery pack relates to the technical field of lithium ion power battery heating. The invention solves the problem that an additional preheating circuit needs to be added and the preheating is not uniform in the external preheating mode that is often used for preheating the existing power battery. The invention utilizes the relatively large self-impedance of the lithium battery at low temperature to generate frequency-adjustable alternating excitation currents between two sets of power batteries through bidirectional DC / DC, so that the interior of the lithium battery is self-heated to a suitable working temperature. In this way, not only no external heating device is needed, but also no external excitation source is required. It is only necessary to install a bidirectional DC / DC converter between the two sets of batteries. By controlling the switching frequency of the conduction direction of the bidirectional DC / DC converter, that is, the alternating excitation frequency , to realize the simultaneous excitation and heating of two batteries. And by establishing the equivalent circuit model of the battery, the optimal alternating excitation frequency for heating is calculated, which is used to control the switching frequency of the bidirectional DC / DC converter. The invention is suitable for the preheating use of the lithium ion power battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion power battery heating. Background technique [0002] With the emergence of energy problems, the state strongly supports the new energy industry. Lithium-ion batteries have become important energy storage components due to their advantages such as high energy density, low self-discharge rate and no memory effect. It has been widely used in new energy power stations, electric vehicles and other fields. [0003] Due to the internal structure and electrochemical properties of lithium batteries, there are major problems in the charge and discharge performance of lithium batteries at low temperatures. The activity of the active material decreases at low temperature, and the internal diffusion rate decreases. As a result, the internal impedance of the lithium-ion battery increases significantly at low temperatures, the output power decreases, and the available battery capacity also decreases accor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/633H01M10/42
CPCY02E60/10
Inventor 吴晓刚崔智昊
Owner HARBIN UNIV OF SCI & TECH
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