Method for thermal runaway protection of power battery pack by virtue of heat pipe technology

A power battery pack and thermal runaway technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as inability to isolate a single cell, damage to thermal runaway cell modules, and safety hazards for drivers and passengers. , to achieve the effect of simple structure, delaying cell fire, and facilitating engineering application

Inactive Publication Date: 2015-06-03
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high-temperature and high-pressure gas generated by the deflagration of the cells of the power battery pack when the heat is out of control, and the flames during the fire will cause great harm to the safety of drivers and passengers, and the thermal runaway protection of the power battery pack is currently a difficult point in the power battery pack technology. At present, the safety of the power battery system is mainly to isolate the battery module through flame-retardant materials and structures, or to isolate the battery pack box from the fire-resistant materials used in the vehicle. This method cannot be used to prevent thermal runaway through isolation. If a single cell is isolated, the high temperature generated by the thermal runaway cell will spread like the surrounding cells, causing a chain reaction, and the module where the thermal runaway cell is located is almost completely damaged
[0004] At present, the protection method for the thermal runaway of the battery pack is mainly to divide the battery pack into several modules, and use fireproof and heat insulating materials to isolate the modules, so as to prevent the heat and flame from the module where the battery cell is located when the thermal runaway of a certain battery cell is out of control. Diffusion to other modules and the passenger compartment, the manufacturing process of this method is complicated, because the flame-retardant materials have heat insulation performance, which is inconsistent with the heat dissipation requirements of the battery core

Method used

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  • Method for thermal runaway protection of power battery pack by virtue of heat pipe technology
  • Method for thermal runaway protection of power battery pack by virtue of heat pipe technology
  • Method for thermal runaway protection of power battery pack by virtue of heat pipe technology

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Embodiment 1

[0028] The heat pipe is connected with the heat dissipation fins, and a fan can be installed on the box body at a position equivalent to the height of the heat dissipation fins. When the fan is turned on, forced convection can be formed on the surface of the heat dissipation fins to enhance the heat dissipation effect. The fan can adopt two forms of blowing or sucking, and the air outlet (inlet) is on the side opposite to the fan on the surface of the box. If there is no fan, the heat is dissipated through the natural convection between the fins and the external environment. The second part of the heat pipe and the box form an airtight battery compartment, which can seal the battery module in the battery compartment to ensure the protection level of the space where the battery module is located in the box.

[0029] The heat pipe inside the box is connected to the heat pipe outside the box, and the heat pipe outside the box is connected to the external heat exchanger. radiator...

Embodiment 2

[0031] Use heat pipe technology to realize the protection of power battery pack cells from thermal runaway;

[0032] The heat pipe consists of 2 to 3 parts. The first part of the heat pipe is inserted into the gap of the electric core, the second part of the heat pipe connects the first part of the heat pipe and the cooling fins, or the second part of the heat pipe connects the first part of the heat pipe and the third part of the heat pipe, and the third part Part of the heat pipe is connected to the heat exchanger outside the battery box;

[0033] The cooling fins can be dissipated by forced air cooling, or by heat pipes and heat exchangers;

[0034] If forced air cooling is used to dissipate heat from the cooling fins, the box body and the second part of the heat pipe form a sealed battery compartment to ensure the protection level of the battery compartment;

[0035] If the heat is dissipated through the heat exchanger, the battery box is a closed battery compartment to e...

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Abstract

The invention discloses a method for thermal runaway protection of a power battery pack by virtue of a heat pipe technology. The heat pipe technology is composed of four parts, namely a battery cell module, a heat pipe, a box body and an external heat radiating structure. By applying the heat pipe technology to the thermal runaway protection aspect of the power battery pack, the temperature increase rate of a battery cell in thermal runaway is delayed in a mode of dredging heat energy, so that the fire breakout of the battery cell is prevented or delayed; and the power battery pack has the characteristics of high efficiency, simple structure, convenience in manufacturing and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for protecting a power battery pack from thermal runaway by utilizing heat pipe technology. Background technique [0002] The current power battery pack has been widely used in electric vehicles, ships, electric bicycles and other fields. With the widespread application of electric vehicles, the safety performance requirements for power battery packs are getting higher and higher. Problems such as high temperature and fire during thermal runaway of power battery pack cells will seriously affect the safety of vehicles and drivers. Therefore, ensuring the safety of the battery pack, delaying the temperature rise of the thermal runaway cell, and preventing or delaying the fire of the cell are all of great help to the safety of the battery pack. [0003] The high-temperature and high-pressure gas generated by the deflagration of the cells of the power battery...

Claims

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Application Information

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IPC IPC(8): H01M10/613H01M10/6552
CPCY02E60/10
Inventor 翟文波俞会根
Owner BEIJING ELECTRIC VEHICLE
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