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A liquid thermal management scheme for cylindrical power battery modules

A technology for cylindrical batteries and power batteries, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of long flow of refrigerant or heat medium, battery temperature difference, etc., and achieve the effect of eliminating the inconsistency of temperature difference and reducing space

Active Publication Date: 2021-11-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of design has a long flow of refrigerant or heat medium, because the heat exchange temperature of the fluid increases or decreases during the flow process, the temperature of the battery will produce a large temperature difference with the flow

Method used

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  • A liquid thermal management scheme for cylindrical power battery modules
  • A liquid thermal management scheme for cylindrical power battery modules
  • A liquid thermal management scheme for cylindrical power battery modules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The spiral coil tube 4 on the cylindrical shell 1 is arranged according to figure 1 As shown, when the temperature of the battery is lower than the reasonable temperature range, the heat medium enters from the top of each branch coil, and the heat medium flows out from the bottom of each branch coil after exchanging heat with the battery during the flow process. When the temperature of the battery is higher than the reasonable temperature range, the cold medium enters from the top of each branch coil, and flows out from the bottom of each branch coil after exchanging heat with the cylindrical battery 7 during the flow.

[0042] When the battery is at a discharge rate of 5C, the inlet cold medium is water, the inlet temperature is set to 298.15K, and the inlet mass flow rate is set to 1×10 -5 kg / s, the temperature rise curves of batteries under different numbers of branch coils (2, 3, 4, 5) are as follows figure 1 As shown in (c), it can be seen that increasing the numb...

Embodiment 2

[0045] The coil arrangement on the housing is in accordance with figure 2 As shown, during the flow process, the temperature of the fluid increases or decreases due to the heat exchange with the battery. The inlet and outlet of each coil are arranged in a staggered manner. For the same transverse section position of the battery, it can offset the flow of such fluid media in different processes. The temperature difference causes the temperature inconsistency of different positions of a single battery.

[0046] When the battery is at a discharge rate of 5C, the inlet cold medium is water, the inlet temperature is set to 298.15K, and the inlet mass flow rate is set to 5×10 -5 kg / s, the temperature rise curves of batteries under different numbers of branch coils are shown in Figure 2(b). It can be seen that the staggered arrangement of coil inlets and outlets can effectively reduce the temperature rise and Control the temperature difference within 5K.

[0047] Figure 9 Shown ...

Embodiment 3

[0049] The coil arrangement on the cylindrical shell 1 is according to image 3 As shown, considering the inconsistent temperature distribution of a single battery along the axial direction, especially when the battery is charged and discharged at a high rate, the temperature difference between the positive terminal and the negative terminal is large (in the case of high rate discharge, the temperature difference can reach 5°C above) phenomenon. The inlet and outlet branches of each coil can be designed asymmetrically. For example, when there are 3 coils, the number of positive coil inlets can be set to 2, and the number of negative coil inlets can be set to 1. When there are 5 coils, the number of positive coil inlets can be set to 3 or 4, and the number of negative coil inlets can be set to 2 or 1. Figure 10 What is shown is the temperature distribution diagram with different numbers of inlets and outlets located at the upper and lower ends of the coil. Figure 10 (a) sh...

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Abstract

The invention discloses a liquid thermal management scheme for a cylindrical power battery module, which belongs to the technical field of power battery thermal management. The cylindrical battery of the invention is located in the hollow interior of a cylindrical shell; a spiral coil is arranged on the outer side of the cylindrical shell ;The spiral coil is wound on the cylindrical shell with different branch coils; the inlet and outlet of each branch coil are arranged in a staggered manner; the inlet and outlet of each branch coil are designed symmetrically or asymmetrically, and each branch coil in the spiral coil The pipes are respectively connected to the manifolds for introducing refrigerant and heat medium, and the manifolds for leading out refrigerant and heat medium through hose connecting pipes, and then connected to the cooling system and heating system of the battery module; serpentine coils are wound on the On the cylindrical shell of the battery, the battery is located in the heat exchange mode of the shell, and the manifold is introduced to provide refrigerant and heat medium for each battery at the same time, so as to reduce the temperature rise between the batteries in the battery module and improve the temperature between the batteries. temperature consistency.

Description

technical field [0001] The invention relates to the technical field of thermal management of power batteries, in particular to a liquid thermal management solution for a cylindrical power battery module. Background technique [0002] Lithium-ion battery is currently the most promising recyclable new energy. It is a research hotspot in academia and industry. It is widely used in pure electric vehicles, hybrid vehicles, portable electronic devices and other fields. However, lithium-ion batteries are very sensitive to temperature, and 20-40°C is their suitable operating temperature range. Too low a temperature will cause the diffusion rate of lithium ions at the interface between the anode and the electrolyte to slow down and cause high polarization resistance. The temperature will lead to the degradation of the SEI film at the interface between the anode and the electrolyte, which will cause a significant drop in battery capacity and power. In addition, lithium-ion batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/615H01M10/617H01M10/643H01M10/6556H01M10/6568
CPCH01M10/613H01M10/615H01M10/617H01M10/643H01M10/6556H01M10/6568Y02E60/10
Inventor 周浩兵周飞张茜徐立鹏王谦之孔继周
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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