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A Method of Dynamically Detecting the Consistency of Battery Packs

A technology for dynamic detection and battery packs, which is applied in the direction of measuring electricity, secondary batteries, and measuring electrical variables. It can solve the problems of not fully covering the battery cells, affecting the performance of the battery pack, and not having real-time performance. It achieves good timeliness, Easy to promote, good practical effect

Active Publication Date: 2017-05-17
HUIZHOU BNET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of electric vehicles, there is such a problem in the battery pack as the power source of electric vehicles: even if the same batch of batteries manufactured by strict processes are used for assembly, these batteries will have differences. The difference is getting bigger and bigger, and eventually the capacity of some cells in the entire battery pack will decay much faster than other normal cells, which is specifically reflected in the process of charging or discharging the battery pack, and these cells will prematurely discharge. Reaching the cut-off point of charging / discharging, this not only affects the performance of the entire battery pack, but also poses safety hazards
[0003] 1. It does not have real-time performance. During the discharge process of the battery pack, the consistency of the battery cells can only be detected during charging, and the BMS cannot be adjusted in real time.
[0004] 2. Only cells with capacity problems during charging can be detected, but cells with capacity problems during discharge cannot be fully covered

Method used

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  • A Method of Dynamically Detecting the Consistency of Battery Packs
  • A Method of Dynamically Detecting the Consistency of Battery Packs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a method for dynamically detecting the consistency of a battery pack includes the following steps during the charging and discharging process of the battery pack:

[0035] Step 1: Monitor the current and voltage of each single cell;

[0036] Step 2: Capturing sudden current and / or sudden voltage;

[0037] Step 3: If the sudden current and / or sudden voltage is captured, calculate the DC internal resistance Rx of each cell of the battery pack;

[0038] Step 4: Determine the consistency of the battery pack based on the DC internal resistance.

[0039] The method for dynamically detecting the consistency of the battery pack provided by the present invention can perform the consistency detection of the battery pack during the charging and discharging process of the battery pack, has good timeliness, simple operation, high accuracy, good practicability and easy promotion.

Embodiment 2

[0041] Example 2 is an improvement of Example 1, refer to figure 2 The method for dynamically detecting the consistency of a battery pack includes the following steps:

[0042] S1 When the car is running or charging, the BMS monitors and records the voltage and current of each cell in the battery pack in real time.

[0043] S2 captures sudden current or sudden voltage. Among them, the conditions of the sudden change current are: (11) the current change amount is not less than 50%, (12) the current sudden change slope is not less than 0.01A / ms, and (13) the sudden change maintenance time is not less than 1s. The condition of the sudden current can also be set to satisfy any one or any combination of the aforementioned conditions (11), (12), and (13). In addition, the amount of current change, current sudden change slope, and sudden change maintenance time in the above conditions (11), (12), (13) can be adjusted according to actual needs.

[0044] The conditions for the sudden volt...

Embodiment 3

[0055] This embodiment is another improvement of Embodiment 1. The different technologies between this embodiment and Embodiment 2 are:

[0056] In the step 3 of calculating the DC internal resistance Rx of each cell of the battery pack, the process of calculating the DC internal resistance R(x-n) of a certain cell is:

[0057] After the current sudden change and / or the voltage sudden change and maintain the first preset period of time, the average cell voltage Un of the tested cell is compared to the average cell current In to obtain the DC internal resistance of the cell R(xn). The first preset time period is 1s.

[0058] As a further technical solution of the present invention: in the step three, for the current and voltage that do not meet the capture conditions, proceed to step one to continue data collection of the voltage and current.

[0059] In the present invention,

[0060] State of charge: the ratio of the remaining capacity of the battery after being used for a period of ...

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Abstract

The invention discloses a method for dynamically detecting the consistency of a battery pack. The method is characterized by comprising the following steps in a battery pack charging / discharging process: step 1, monitoring current and voltage of each single cell; step 2, capturing inrush current and / or inrush voltage; step 3, if capturing the inrush current and / or the inrush voltage, calculating direct-current inner resistance Rx of each single cell of the battery pack; and step 4, judging the consistency of the battery pack according to the direct-current inner resistance. The method disclosed by the invention can be used for carrying out consistency detection of the battery pack, and has the advantages of good timeliness, simplicity in operation, high accuracy, good practicability and easiness for popularization.

Description

Technical field [0001] The invention relates to the technical field of battery pack dynamic monitoring applications, in particular to a method for dynamically detecting the consistency of a battery pack. Background technique [0002] In the field of electric vehicles, the battery pack as the power source of electric vehicles has such a problem: even if the same batch of batteries manufactured through strict processes are used for packaging, these batteries will be different. After a period of use, this The difference is getting bigger and bigger. In the end, the capacity of some cells in the entire battery pack will decay much faster than other normal cells. This is reflected in the charging or discharging process of the battery pack, these cells will be premature Reach the cut-off point of charging / discharging, which not only affects the performance of the entire battery pack, but also poses safety risks. Some BMS (Battery Management System) manufacturers will check the consist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36H01M10/48
CPCG01R31/389G01R31/396H01M10/482Y02E60/10
Inventor 徐文赋任素云曾咏涛
Owner HUIZHOU BNET TECH CO LTD