Method and device for determining reliability of battery box of electric vehicle

A technology of electric vehicles and determination methods, applied in the field of automobiles, can solve the problems of lack of mature mechanism, aggravated battery inconsistency, affecting the reliability of battery boxes, etc., and achieve the effect of accurate reliability values

Inactive Publication Date: 2019-07-09
CH AUTO TECH CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for efficient use of space by connecting multiple small lithium ion (Li-ion) batteries together into one larger unit called an array or module. By grouping them up according to their constraints, they may have more reliable performance than traditional methods such as serial connection.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality control over electrical devices such as car tractor boxes that require high voltage and current levels during their operation. Current methods involve testing each battery individually before assembly into the device, but they may also result in variations from batches of similar cells leading to potential issues when combined together. Therefore, there remains room for improvement through improved mechanism for determining if these batteries can maintain reliable functionality even after prolonged periods under harsh conditions like fuel supply scarcity.

Method used

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  • Method and device for determining reliability of battery box of electric vehicle
  • Method and device for determining reliability of battery box of electric vehicle
  • Method and device for determining reliability of battery box of electric vehicle

Examples

Experimental program
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Effect test

example 1

[0063] The power battery system uses a nickel cobalt oxide lithium battery whose model is nCR18650. This type of lithium battery is a high-energy battery with a nominal voltage of 3.6V and a nominal capacity of 3.10Ah. The basic parameters of the power battery system are shown in Table 1-3, among which Table 1 is the basic parameter table; Table 2 is the cell power matrix table; Table 3 is the battery system power matrix table.

[0064] Cell model Panasonic Cell type Ternary Cell voltage / V3.60 Unit capacity / Ah3.10 Total battery voltage / V356.4 Total battery capacity / Ah213.90 Total battery power / kWh76.23 Group way 69P99S

[0065] Table 1

[0066] project parameter Remarks Sustainable charging current / A3.1 10s pulse charging current / A6.2 Continuous discharge current / A6.2 10s pulse discharge current / A9.2 Sustainable charging power / kW0.011 Sustainable discharge power / kW0.022

[0067] Table 2

[0068] project parameter Remarks Sustainable charging

example 2

[0085] The power battery system uses a nickel-cobalt-manganese lithium battery whose model is B18650CC. The battery has a nominal voltage of 3.60V and a nominal capacity of 2.00Ah. The basic parameters of the power battery system are shown in Table 4-6. Table 4 is the basic parameter table; Table 5 is the cell power matrix table; Table 6 is the battery system power matrix table.

[0086] Cell model CEA-LM36 Cell type Ternary Cell voltage / V3.65 Unit capacity / Ah36 Total battery voltage / V365 Total battery capacity / Ah218 Total battery power / kWh78.84 Group way 6P100S

[0087] Table 4

[0088] project parameter Remarks Sustainable charging current / A36 10s pulse charging current / A54 Continuous discharge current / A72 10s pulse discharge current / A108 Sustainable charging power / kW0.1314 Sustainable discharge power / kW0.2628

[0089] table 5

[0090] project parameter Remarks Sustainable charging current / A218 Pulse, step charging current / A327 Conti

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Abstract

The embodiment of the invention discloses a method and device for determining the reliability of a battery box of an electric vehicle. n batteries are connected to one other in parallel to form one parallel connection battery set, and m parallel connection battery sets are connected to one another in series, wherein the n and the m each is a positive integer equal to or greater than 2. The methodincludes the following steps that based on a constraint condition set of the battery box, the maximum number of the batteries permitting faults in each parallel connection battery set is determined, wherein the constraint condition set includes a first preset requirement which the charging power of the battery box needs to meet, a second preset requirement which the discharging power of the battery box needs to meet, and a third preset requirement which needs to be met when the service life of the battery box is shortened due to the damage of one single battery; based on the maximum number ofthe batteries permitting faults, the reliability parameters of the batteries, n and m, the reliability function of the battery box is determined; by receiving the reliability input value of the batteries, the reliability value, corresponding to the reliability input value, of the battery box is determined based on the reliability function. The reliability value of the battery box with the batteries connected in parallel firstly and then the battery sets connected in series can be accurately predicted.

Description

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Claims

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Application Information

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Owner CH AUTO TECH CORP CO LTD
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