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Method for determining pulse heating temperature acquisition point of power battery

A temperature collection point and pulse heating technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of the actual temperature sampling point of the battery core and the inability to reflect the effectiveness of the temperature, and achieve reliable and reliable temperature sampling. The effect of high accuracy

Active Publication Date: 2022-04-12
深蓝汽车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN108777339A discloses a lithium-ion battery pulse discharge self-heating method and device, which collects temperature through a temperature sensor, selects current and frequency for testing, but the actual temperature sampling point of the battery core and the validity of the temperature cannot be reflected

Method used

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  • Method for determining pulse heating temperature acquisition point of power battery
  • Method for determining pulse heating temperature acquisition point of power battery
  • Method for determining pulse heating temperature acquisition point of power battery

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1: as figure 1 As shown, there are M=102 batteries in the battery pack used in this embodiment, and the method for determining the pulse heating temperature collection point of the power battery includes:

[0030] Step 1. Select any one of the 102 cells that make up the battery pack (that is, select a cell that belongs to the same model as the 102 cells in the battery pack), and arrange a temperature in the center of the large surface of the cell. sensor, and then go to step 2.

[0031] Step 2. Select the pulse heating current and pulse heating frequency required for the test, and perform n=100 pulse heating on the battery cell, collect the large surface temperature of the battery cell during the pulse heating process, and use the large surface temperature of the battery cell as the battery temperature. core temperature, get 100 cell temperature change curves, and then go to step 3.

[0032] Step 3: Use 100 cell temperature change curves to optimize the pre...

Embodiment 2

[0045] Embodiment 2: The method for determining the pulse heating temperature collection point of the power battery in this embodiment, most of the steps are the same as in Embodiment 1, the only difference is that in step 6, n large surface temperature change curves and n The specific method of the temperature change curve of the top cover of the strip is as follows: select the median of 15 large surface temperatures (that is, the large surface temperatures of 15 batteries) at each time point during a pulse heating process, and compare each time point with the median number (that is, the median of 15 large surface temperatures), and a large surface temperature change curve corresponding to this pulse heating is obtained. Select the median of 15 top cover temperatures (that is, the top cover temperatures of 15 cells) at each time point during a pulse heating process, and compare each time point with the median (that is, the median of 15 top cover temperatures) Number) correspo...

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Abstract

The invention discloses a method for determining a pulse heating temperature acquisition point of a power battery, which comprises the following steps of: performing pulse heating on a single battery cell, optimizing a temperature rise model, selecting a certain battery cell according to the temperature distribution condition of each battery cell in a battery pack obtained by thermal simulation, and determining the pulse heating temperature acquisition point of the power battery. The method comprises the following steps: arranging temperature sensors on a large surface and a top cover of a selected battery cell, carrying out temperature acquisition, establishing a mapping relation between the temperature of the large surface of the battery cell and the temperature of the top cover of the battery cell, and verifying the rationality and effectiveness of a temperature acquisition point by using an optimized temperature rise model, thereby obtaining an optimal temperature acquisition point in a battery pack. The temperature sampling accuracy is higher, the temperature authenticity is more reliable, and a reliable judgment basis is provided for a temperature control strategy of a subsequent power battery in the pulse heating process.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for determining a pulse heating temperature collection point of a power battery. Background technique [0002] The performance of the power battery is greatly affected by the ambient temperature of the battery pack. In a low-temperature environment, key performances such as the charging capacity, discharge power, energy efficiency, and discharge energy of the power battery will drop sharply, resulting in the power battery being unable to work normally under low temperature conditions. Satisfying the power requirements of electric vehicles seriously affects the experience and convenience of users. The more serious consequence is that the abuse of the battery under low temperature conditions, such as overcharging and over-discharging, can easily lead to lithium precipitation and other phenomena in the battery, which will lead to accelerated battery capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48G06F30/20G06F119/08
CPCY02E60/10
Inventor 郑豪谭希袁昌荣牟丽莎
Owner 深蓝汽车科技有限公司