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A calculation method for battery bus bar selection

A technology of a battery busbar and a calculation method, which is applied in the field of battery busbar selection and calculation, can solve the problems of hidden safety hazards and inaccuracy of batteries, and achieve the effect of increasing safety.

Active Publication Date: 2021-08-17
北京长城华冠汽车技术开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a calculation method for battery busbar type selection, so as to solve the technical problems existing in the prior art that the selection of the wire diameter of the rated current is inaccurate, and it is easy to cause potential safety hazards during the use of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] step one:

[0044] When the wire is a flat busbar,

[0045] Step two:

[0046] To calculate A, in this embodiment, a flat busbar with insulating plastic sheath with a length of 25mm and a width of 2mm is selected, so A=25x2=50mm.

[0047] Step three:

[0048] Calculate p, according to the length value is 25mm, the width value is 2mm, so the perimeter of the flat busbar is, p=25x2+2x2=54mm.

[0049] Step four:

[0050] Calculate θ. In this embodiment, the ambient temperature is selected as 25°C, and the maximum temperature of the wire in the battery system is 60°C. Therefore, the maximum expected conductor temperature is used to subtract the ambient temperature, then θ=60-25=35°C.

[0051] Step five:

[0052] According to the above optional content, when the wire material is silver, the temperature coefficient of resistance is 0.0038; when the wire material is copper, the temperature coefficient of resistance is 0.004; when the wire material is aluminum, the tempe...

Embodiment 2

[0068] step one:

[0069] When the wire is a round busbar,

[0070] Step two:

[0071]Calculate A. In this embodiment, a round busbar with insulating plastic sheath with a length of 25mm and a width of 2mm is selected, so A=25x2=50mm.

[0072] Step three:

[0073] Calculate θ. In this embodiment, the ambient temperature is selected as 25°C, and the maximum temperature of the wire in the battery system is 60°C. Therefore, the maximum expected conductor temperature is used to subtract the ambient temperature, then θ=60-25=35°C.

[0074] Step four:

[0075] According to the above optional content, when the wire material is silver, the temperature coefficient of resistance is 0.0038; when the wire material is copper, the temperature coefficient of resistance is 0.004; when the wire material is aluminum, the temperature coefficient of resistance is 0.0039.

[0076] However, in this embodiment, a round bus bar whose material is copper is selected, so α=0.004.

[0077] Of cour...

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Abstract

A calculation method for battery bus type selection provided by the present invention relates to the field of battery technology, using the formula to calculate the current value I: when the wire is a flat bus, take λ=1.02, γ=0; when the wire is a round bus, take λ = 0, γ = 1.78; where, A is the cross-sectional area of ​​the battery busbar, in square millimeters; K is the insulation coefficient; p is the circumference of the conductor, in millimeters; θ is the difference between the maximum expected conductor temperature and the ambient temperature, The unit is Celsius; α is the material resistance temperature coefficient; ρ is the material resistivity. In the above technical solution, by controlling the maximum desired wire harness temperature and calculating the optimal wire diameter of the high-voltage wire harness in the battery box, the problem of inaccurate calculation of the wire diameter in the prior art can be solved, and then in the selection of the wire diameter of the rated current Form an effective analysis in the process, make the battery pack lightweight, and control the temperature of the high-voltage wiring harness, thereby increasing the safety of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a calculation method for battery busbar type selection. Background technique [0002] At present, when selecting the appropriate wire diameter for the rated current, the rated current is usually obtained by dividing the rated power of the battery system by the rated voltage, and then selecting the appropriate wire diameter that meets the rated current according to the specifications provided by the supplier. [0003] However, this selection method is very rough and cannot effectively analyze the wire diameter of a reasonable rated current, so there is also a potential safety hazard in the use of the battery. Contents of the invention [0004] The purpose of the present invention is to provide a calculation method for battery busbar type selection, so as to solve the technical problem in the prior art that the selection of the wire diameter of the rated current is inaccurate, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F113/16G06F119/08
CPCG06F30/20
Inventor 郑洁民张猛孔令广
Owner 北京长城华冠汽车技术开发有限公司
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