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Battery pack equalization method, battery management system and battery system

A technology of battery management system and equalization method, which is applied in the field of battery management system, battery system, and battery pack equalization, which can solve problems such as reducing the service life of lithium iron phosphate battery packs, so as to avoid the exertion of power capacity and available energy, and improve the balance Efficiency, the effect of achieving charge balance

Active Publication Date: 2021-06-25
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, during the use of the lithium iron phosphate battery system, after repeated charging, discharging and calendar storage, the charge imbalance between the battery cells gradually increases, which directly affects the power capability and available energy of the lithium iron phosphate battery system. The performance of the battery reduces the service life of the lithium iron phosphate battery pack

Method used

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  • Battery pack equalization method, battery management system and battery system
  • Battery pack equalization method, battery management system and battery system
  • Battery pack equalization method, battery management system and battery system

Examples

Experimental program
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Embodiment 1

[0051] The embodiment of the present invention provides a battery pack equalization method, please refer to figure 1 , which is a schematic flowchart of Embodiment 1 of the battery pack equalization method provided by the embodiment of the present invention. As shown in the figure, the method includes the following steps:

[0052] S101. Detect the voltage data of each battery unit in the lithium iron phosphate battery pack, and acquire the state of charge of the lithium iron phosphate battery pack according to the voltage data of each battery unit.

[0053] S102. Acquire a minimum voltage value in the voltage data.

[0054] S103, judging whether the state of charge is between 10% and 40%, and respectively calculating the difference between the voltage data of each battery cell in the lithium iron phosphate battery pack and the minimum voltage value and the preset voltage threshold Compare.

[0055] S104. If it is determined that the state of charge is between 10% and 40%, an...

Embodiment 2

[0057] Please refer to figure 2 , which is a schematic flowchart of Embodiment 2 of the battery pack equalization method provided by the embodiment of the present invention, and this embodiment is a specific implementation method of Embodiment 1. As shown, the method includes the following steps:

[0058] S201. Detect the voltage data of each battery unit in the lithium iron phosphate battery pack, and acquire the state of charge of the lithium iron phosphate battery pack according to the voltage data of each battery unit.

[0059] Specifically, in the embodiment of the present invention, the voltage data of each battery cell in the lithium iron phosphate battery pack can be detected in the sleep mode.

[0060] It should be noted that the dormant mode refers to that the lithium iron phosphate battery pack does not input energy or output energy.

[0061] It should be noted that, in the embodiment of the present invention, the lithium iron phosphate battery pack is usually co...

Embodiment 3

[0088] Please refer to Figure 4 , which is a schematic flowchart of Embodiment 3 of the battery pack equalization method provided by the embodiment of the present invention, and this embodiment is another specific implementation method of Embodiment 1. As shown, the method includes the following steps:

[0089] S401, fully charge the lithium iron phosphate battery pack, and then discharge until the state of charge of the lithium iron phosphate battery pack is at 20% to 25%.

[0090] S402, in the body sleep mode, detect and record the voltage data of 100 battery cells connected in series in the lithium iron phosphate battery pack, denoted as U N , N is equal to 1, 2, 3, ..., 100.

[0091] S403. Calculate the difference between the voltage data of each battery cell in the lithium iron phosphate battery pack and the minimum voltage value.

[0092] S404. Discharging the battery cells whose voltage data and the minimum voltage value in the lithium iron phosphate battery pack ar...

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Abstract

A battery pack balancing method, a battery management system and a battery system. The equalization method includes: by detecting the voltage data of each battery cell in the lithium iron phosphate battery pack, and according to the voltage data of each battery cell, obtaining the state of charge of the lithium iron phosphate battery pack (S101), and obtaining the voltage data in the voltage data The minimum voltage value (S102); thus, determine whether the state of charge is between 10% and 40%, and respectively compare the difference between the voltage data of each battery cell in the lithium iron phosphate battery pack and the minimum voltage value with the preset Comparing the voltage threshold (S103); if it is determined that the state of charge is between 10% and 40%, and there is a battery unit whose voltage data and the minimum voltage value are greater than or equal to the voltage threshold, discharge the battery unit (S104 ). The consistency of the state of charge among the battery cells in the lithium iron phosphate battery pack is improved by the balancing method, and the service life of the lithium iron phosphate battery pack is prolonged.

Description

【Technical field】 [0001] The invention relates to the technical field of batteries, in particular to a battery pack balancing method, a battery management system and a battery system. 【Background technique】 [0002] Lithium iron phosphate battery pack (LiFePO 4 Battery Pack) has a typical charging and discharging platform. This excellent electrical performance, high cycle life, and high safety characteristics make this product widely used in the fields of electric vehicles and energy storage. [0003] The lithium iron phosphate battery system consists of a lithium iron phosphate battery pack and a battery management system. The lithium iron phosphate battery pack is composed of a large number of battery cells connected in series or in parallel or in combination. Due to variations in the raw materials and manufacturing process of the battery cells, the state of charge (SoC) of the battery cells is not exactly the same. As a result, during the use of the lithium iron phosp...

Claims

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Application Information

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IPC IPC(8): H01M10/42
CPCH01M10/42Y02E60/10
Inventor 陈玲杨元金周伟邓兆轩蔡毅种晋
Owner CONTEMPORARY AMPEREX TECH CO