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Method and device for measuring heat generation power of batteries in condition of variable current

A technology of generating heat power and changing current, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of temperature difference, expensive testing equipment and expenses, unable to obtain heat generating power and heat, etc., and achieve low cost. , The effect of simple test equipment and easy implementation

Active Publication Date: 2015-04-29
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the calorific value of lithium batteries is mostly described by the temperature rise curve. This method obtains the temperature difference and cannot obtain the specific heat generation power and heat.
[0003] At present, the existing technology generally uses accelerated calorimeters to test the calorific value of lithium batteries, but the test equipment and costs are expensive, and most companies do not have the corresponding financial resources
And in most cases, what is tested is the temperature rise curve of the lithium battery charging or discharging at a constant current, which is inconsistent with the changing current and the alternating charging and discharging of the lithium battery in the actual working state.

Method used

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  • Method and device for measuring heat generation power of batteries in condition of variable current
  • Method and device for measuring heat generation power of batteries in condition of variable current
  • Method and device for measuring heat generation power of batteries in condition of variable current

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Effect test

Embodiment 1

[0061] In order to overcome the shortcomings of current calculation methods for the calorific value of power batteries such as lithium batteries and the high cost of testing, the embodiment of the present invention proposes a battery under changing operating current conditions, the heat generation power changes with the test current and time calculation method.

[0062] The aforementioned power battery may be a lithium battery, a lead-acid battery, a nickel-cadmium battery or the like, and the following uses a lithium battery as an example to describe the embodiments of the present invention.

[0063] This embodiment provides a processing flow of a method for measuring the heat generation power of a battery under variable current conditions as follows: figure 1 As shown, the following processing steps are included:

[0064] Step S110, measuring the temperature rise data of charging and / or discharging the lithium battery at different rates.

[0065] The discharge rate refers ...

Embodiment 2

[0103] The schematic diagram of the current variation with time of a certain type of lithium battery cell under actual working conditions provided by this embodiment is as follows: image 3 As shown, in order to calculate the heat generation power of a certain type of lithium battery as a function of current in actual working conditions, you can first measure the discharge temperature rise data of this type of lithium battery at different rates. The measurement results are shown in Table 1 below:

[0104] Table 1

[0105] time(s)

0.5C

1C

2C

120

26.87

26.17

26.23

240

26.90

26.17

26.27

360

26.97

26.30

28.43

480

27.03

27.03

31.83

600

27.17

27.77

34.67

900

27.50

29.33

39.43

1200

27.83

30.23

42.60

1500

28.07

30.80

44.90

1800

28.20

31.40

45.67

2100

28.30

31.90

47.73

240...

Embodiment 3

[0114] This embodiment provides a device for measuring the heat generation power of the battery under variable current conditions, and its specific implementation structure is as follows Image 6 As shown, it can specifically include the following modules:

[0115] Different magnification temperature rise data measurement module 61, used to measure the temperature rise data of the charging and / or discharging of the battery at different magnifications;

[0116] The heat generation power calculation module 62 at different rates is used to calculate the heat generation power of the battery charged and / or discharged at different rates according to the temperature rise data obtained by the temperature rise data measurement module at different rates;

[0117] The heat generation power and current value relational expression acquisition module 63 is used to generate the current value corresponding to the heat generation power of charging and / or discharging at different rates obtained...

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Abstract

Embodiments of the invention provide a method and device for measuring heat generation power of batteries in condition of variable current. The method comprises the following steps: measuring charging and / or discharging temperature rise data of a battery at different rates, and calculating charging and / or discharging heat generation powers of the battery at different rate according to the charging and / or discharging temperature rise data; generating a relation between the charging and / or discharging heat generation powers of the battery and the current values through curve fitting according to the current values corresponding to the charging and / or discharging heat generation powers at different rates. According to the embodiment of the invention, the relation among the heat generation powers as well as the current and time in condition of variable working current of the battery can be obtained by simply testing the temperature rise data of the battery at a fixed rate and then performing theoretical calculation according to the test result; the test equipment is simple, convenient to implement, and low in cost; a solution for effectively measuring the heat generation power of the battery in the process of charging and discharging in condition of variable current is provided.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a method and device for measuring the heat generation power of a battery under variable current conditions. Background technique [0002] As the new energy industry has higher and higher requirements on the performance and cycle life of lithium battery packs, more and more attention has been paid to the thermal management scheme of lithium battery packs, and the thermal management scheme needs to be designed according to the heat generation of ion batteries. At present, the calorific value of lithium batteries is mostly described by the temperature rise curve. This method obtains the temperature difference, but cannot obtain the specific heat generation power and heat. [0003] At present, the existing technology generally tests the calorific value of lithium batteries by accelerating calorimeters, but the testing equipment and costs are expensive, and most enterprises do...

Claims

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Application Information

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IPC IPC(8): G01R31/36G06F19/00
Inventor 翟文波
Owner BEIJING ELECTRIC VEHICLE
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