连接方式对电池模块一致性与产热影响

丁昌明; 文华

doi:10.13700/j.bh.1001-5965.2020.0513

连接方式对电池模块一致性与产热影响

doi: 10.13700/j.bh.1001-5965.2020.0513

丁昌明,
文华^,

南昌大学机电工程学院, 南昌 330031

基金项目:

国家自然科学基金 51762034

详细信息

通讯作者:
文华, E-mail: wenhua25@ncu.edu.cn

中图分类号: TM912
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- HTML全文浏览量: 103
- PDF下载量: 27
- 被引次数: 0
出版历程
- 收稿日期: 2020-09-11
- 录用日期: 2020-11-06
- 网络出版日期: 2022-01-20

Influence of connection mode on consistency and heat production of battery modules

DING Changming,
WEN Hua^,

School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China

Funds:

National Natural Science Foundation of China 51762034

More Information

Corresponding author: WEN Hua, E-mail: wenhua25@ncu.edu.cn

摘要

摘要:
为了研究锂离子电池成组使用时遇到的不一致性和温度不均的问题，基于电化学-热耦合模型，以8块软包电池为例，通过多种串并联方式建立不同的电路模块，分析在1C和0.5C放电过程中电池的温度特征和不一致性。结果表明：电池模块的均温性和一致性与放电倍率有关。不管是先串后并还是先并后串，并联支路的增加或者是串联单元数量的减少都会使电池模块的平均温升和最大温差降低，还会影响温升速率和放电结束时的电压。并联支路数相同时，先串后并模块的一致性要比先并后串好。对于先并后串的模块，其并联支路中串联电池的数量越多，放电过程中电池之间的一致性越差。对于先串后并的模块，其并联的支路数越多，电池的一致性越差。
- 电池模组 /
- 不一致性 /
- 电化学-热耦合模型 /
- 串并联 /
- 放电
Abstract:
In order to study the inconsistency and uneven behavior of temperature in lithium-ion batteries packing, based on the electrochemical-thermal coupling model, this paper takes eight pouch batteries as an example, establishes different circuit modules through different series and parallel connection modes, and analyzes the temperature characteristics and inconsistency of batteries at the discharge of 1C and 0.5C. The results show that the inconsistency and temperature difference of the battery module are related to the discharge rate. The increase of parallel branches or the decrease of the number of series units will not only reduce the average temperature rise and maximum temperature difference of battery module, but also affect the temperature rise rate and voltage at the end of discharge. When the number of parallel branches is the same, the consistency of the series-parallel modules is better than that of parallel-series modules. For the parallel-series modules, the more batteries are connected in series in the parallel branch, the worse the consistency of the batteries is. For the series-parallel modules, the more the number of parallel branches, the worse the battery consistency.
- battery module /
- inconsistency /
- electrochemical-thermal coupling model /
- series and parallel /
- discharge

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图 1 电池模块结构简化示意图

Figure 1. Simplified schematic diagram of battery module structure

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图 2 电池模块拓扑

Figure 2. Battery module topology

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图 3 热电偶位置分布

Figure 3. Thermocouple position distribution

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图 4 仿真与实验温度数据

Figure 4. Simulation and experimental temperature data

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图 5 仿真与实验电压数据

Figure 5. Simulation and experimental voltage data

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图 6 电池模块平均温升

Figure 6. Average temperature rise of battery module

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图 7 电池模块最大温差

Figure 7. Maximum temperature difference of battery module

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图 8 不同电路放电结束时的电池电压对比

Figure 8. Comparison of battery voltage at the end of discharge in different circuits

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图 9 不同电路的不一致性系数

Figure 9. Inconsistency coefficient of different circuits

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表 1 电池的部分参数

Table 1. Partial battery parameters

参数	正极	隔膜	负极	其余数据	描述
L/μm	90^a	20^a	60^a		厚度
R_p/μm	3.5^a		6^a		活性颗粒粒子半径
ε₁	0.56^b		0.44^b		固相体积分数
ε₂	0.555 6^b	0.4^b	0.444 4^b		液相体积分数
c_{1, max}/(mol·m^-3)	19 102^b		36 100^b		最大可嵌锂浓度
c_{2, 0}/(mol·m^-3)	1 200^a	1 200^a	1 200^a		初始电解液锂浓度
k₀/(m·s^-1)	4.38×10^-11c		1.63×10^-11c		反应速率常数
H×W×L_b/mm				342×109.5×9.5^a	电池长×宽×厚
C_pa/(J·(kg·K)^-1)				1 299.4^a	电芯平均比热容
C_pb/(J·(kg·K)^-1)	900^a		385^a		极耳比热容
λ_a/(W·(m·K)^-1)				1.282 7^b	电芯平均导热系数
λ_b/(W·(m·K)^-1)	238^b		400^b		极耳导热系数
注：上标a为厂家提供数据；上标b为计算所得数据；上标c为根据参考文献和基于文献调整所得。

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表 2 控制方程和边界条件

Table 2. Governing equations and boundary conditions

	控制方程	边界条件
质量守恒
电荷守恒
电化学反应速率
能量守恒

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表 3 放电结束时的P₀值

Table 3. P₀ at the end of discharge

电路	P₀值/10^-5
电路	0.5C	1C
电路a	7.488 9	22.843 3
电路b	88.537 5	179.948 6
电路c	54.487 5	89.021 1
电路d	10.012 9	20.278 2
电路e	88.706 9	180.002 8
电路f	155.269 4	296.066 4

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