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Cylindrical power battery module liquid heat management scheme

A technology of 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

Active Publication Date: 2019-04-09
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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  • Cylindrical power battery module liquid heat management scheme
  • Cylindrical power battery module liquid heat management scheme
  • Cylindrical power battery module liquid heat management scheme

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 cylindrical power battery module liquid heat management scheme, and belongs to the technical field of power battery heat management. In the cylindrical power battery module liquid heat management scheme, cylindrical batteries are positioned inside hollow parts of cylindrical shells; spiral coils are arranged outside the cylindrical shells; the spiral coils are wound on the cylindrical shells by different branch coils; an inlet and an outlet of each branch coil are arranged in a staggered mode; the inlet and the outlet of each branch coil adopt symmetric or asymmetricdesign; each branch coil in the spiral coils is respectively connected with a manifold for leading in refrigerant and heat media and a manifold for leading out the refrigerant and heat media by hose connection pipes, and then is connected with a cooling system and a heating system of a battery module; and in a heat exchange mode that the S-shaped coils are wound on the battery cylindrical shells and the batteries are positioned in the shells, when the manifolds are led in, the refrigerant and heat medias are provided for each battery, so as to reduce temperature rise among the batteries in thebattery module and improve temperature consistency among the batteries.

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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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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