CN110988718A - Test system and method for measuring expansion stress of lithium ion battery - Google Patents
Test system and method for measuring expansion stress of lithium ion battery Download PDFInfo
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- CN110988718A CN110988718A CN201911325478.0A CN201911325478A CN110988718A CN 110988718 A CN110988718 A CN 110988718A CN 201911325478 A CN201911325478 A CN 201911325478A CN 110988718 A CN110988718 A CN 110988718A
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- lithium ion
- ion battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention relates to a test system and a method for measuring expansion stress of a lithium ion battery. The system comprises a lithium ion battery clamp, a data acquisition instrument and a computer, wherein the lithium ion battery clamp comprises: a positioning bolt for positioning the battery; an upper end plate and a lower end plate accommodating a battery therebetween; a pressure sensor placed at a lower portion of the upper end plate for sensing a pressure experienced by the battery, the system being configured to perform the method of: placing a battery between an upper end plate and a lower end plate of a battery clamp, and adjusting the distance between the upper end plate and the lower end plate of the lithium ion battery clamp to enable a pressure sensor to be tightly attached to the battery; connecting the pressure sensor to a data acquisition instrument and opening the system; carrying out charge-discharge circulation on the lithium ion battery, and monitoring a strain signal of a pressure sensor of the battery clamp by the system; and calculating the expansion pressure of the battery according to the working curve of the pressure sensor. The invention can continuously monitor the expansion stress change of the lithium ion battery in the charging and discharging processes.
Description
Technical Field
The invention relates to the technical field of chemical power supplies, in particular to a test system and a method for measuring expansion stress of a lithium ion battery.
Background
At present, lithium ion batteries have the characteristics of high working voltage, high energy density, excellent charge retention capacity, long cycle life, wide working temperature range, no memory effect and the like, are widely applied to electronic products since commercialization, and gradually replace traditional batteries in the fields of aviation, aerospace, navigation, tactical weapons, vehicles, medical instruments and the like.
Lithium ion batteries are actually Li + concentration batteries. During charging, Li + is removed from crystal lattices of the anode material, is transferred to the cathode through electrolyte, and is embedded into a layered structure (or crystal lattices) of the cathode material or forms an alloy; during discharge, the Li + migration direction is reversed. Because the volume expansion of unit cells caused by the insertion and the extraction of Li + in the anode and cathode materials is inconsistent, the working process of the lithium ion battery is accompanied by the volume change of the electrode materials and is expressed as the thickness change of the pole piece. In addition, the power battery can be gradually aged in the recycling process, and gas is generated to cause the battery to expand. Therefore, the power battery is fixedly restrained when the module is assembled for the reasons of battery safety, reliability and service life. How much force is used to constrain the assembly of the die is of great research value, because the quality of constraint is directly related to the performance and life of the battery.
Disclosure of Invention
The invention aims to provide a test system for measuring expansion stress of a lithium ion battery, which can obtain expansion pressure stress data of the lithium ion battery caused by charge and discharge cycles and provide support for optimizing the strength constraint of a power battery during module assembly so as to improve the performance and the service life of the battery.
Technical objects that can be achieved by the present invention are not limited to what has been particularly described above, and other technical objects that are not described herein will be more clearly understood by those skilled in the art from the following detailed description.
The technical scheme for solving the technical problems is as follows:
according to one aspect of the present disclosure, a test system for measuring lithium ion battery expansion stress is provided, the system comprising a lithium ion battery clamp, a data collector, and a computer, the lithium ion battery clamp comprising:
a positioning bolt for positioning the lithium ion battery;
an upper end plate and a lower end plate for accommodating a lithium ion battery therebetween;
and the pressure sensor is placed at the lower part of the upper end plate and used for sensing the pressure born by the lithium ion battery.
According to an aspect of the disclosure, the above system is configured to perform the following method:
s1: placing a lithium ion battery between an upper end plate and a lower end plate of the lithium ion battery clamp, and adjusting the distance between the upper end plate and the lower end plate of the lithium ion battery clamp to enable the pressure sensor to be tightly attached to the lithium ion battery;
s2: connecting the pressure sensor to a data collector and turning on the system, the data collector sending data sensed by the pressure sensor to a computer of the system;
s3: carrying out charge-discharge circulation on the lithium ion battery, wherein the system monitors a strain signal of a pressure sensor of the lithium ion battery clamp;
s4: and calculating the expansion pressure of the lithium ion battery according to the working curve of the pressure sensor.
Alternatively, in the system as described above, in S1, the mounting area of the pressure sensor covers a majority of the area of the lithium ion battery.
Alternatively, in the system described above, the initial readings of the pressure sensors are consistent and of small value at S3.
Optionally, in the system as described above, the lithium ion battery is a pouch lithium ion power battery.
Optionally, in the system as described above, the rated capacity of the lithium ion battery is 5 Ah.
The above-described embodiments are only some of the embodiments of the present invention, and those skilled in the art can derive and understand various embodiments including technical features of the present invention from the following detailed description of the present invention.
It will be appreciated by persons skilled in the art that the effects that can be achieved by the present invention are not limited to what has been particularly described hereinabove and other advantages of the present invention will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.
Fig. 1 is a front view of a lithium ion battery holder according to an embodiment of the present invention.
Fig. 2 is a side view of a lithium ion battery clamp according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a corresponding relationship between a battery voltage and an expansion pressure obtained by a test method provided in an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention, rather than to show the only embodiments that can be implemented according to the present invention. The following detailed description includes specific details in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details.
In some instances, well-known structures and devices are omitted or shown in block diagram form, focusing on important features of the structures and devices so as not to obscure the concept of the present invention. The same reference numbers will be used throughout the specification to refer to the same or like parts.
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "center", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A test system for measuring expansion stress of a lithium ion battery according to the present invention will be described in further detail with reference to fig. 1 to 3. As shown in fig. 1-2, the present invention provides a test system for measuring expansion stress of a lithium ion battery, which includes a lithium ion battery clamp, a data acquisition instrument and a computer, wherein the lithium ion battery clamp includes: a positioning bolt 1 for positioning the lithium ion battery; an upper end plate 2 and a lower end plate 6 for accommodating a lithium ion battery between the upper end plate 2 and the lower end plate 6; and the pressure sensor 3 is placed at the lower part of the upper end plate 2 and is used for sensing the pressure born by the lithium ion battery. The lithium ion battery is provided with a positive tab 4 and a negative tab 5 and is used for connecting a power supply to charge and discharge the battery.
In the present invention, the expansion pressure mainly refers to a pressure generated by a thickness change of the lithium ion battery on an external structural member (e.g., a clamp) in contact with the lithium ion battery during a charging and discharging process of the lithium ion battery.
The invention mainly aims at the soft package lithium ion power battery.
The test method for measuring the expansion stress of the lithium ion battery comprises the following steps:
1) a pressure sensor 3 is pasted on the lithium ion battery clamp;
2) placing the lithium ion battery between two end plates of the clamp, and adjusting the distance between the two end plates of the clamp to enable the pressure sensor 3 to be tightly attached to the lithium ion battery;
3) connecting the data acquisition instrument with a computer and opening a test system;
4) carrying out charge-discharge circulation on the lithium ion battery, and automatically monitoring a strain signal of a pressure sensor 3 on the clamp by a test system;
5) and calculating the expansion pressure of the lithium ion battery according to the working curve of the pressure sensor 3.
The test method for measuring the expansion pressure of the lithium ion battery is described in detail by taking the measurement of the expansion stress of the single lithium ion battery as an example.
In this embodiment, the lithium ion battery is a soft-package single power battery, the electrochemical system is NCM811/SiOC, and the rated capacity is 5 Ah. According to an embodiment of the present invention, a test system for measuring expansion stress of a lithium ion battery includes:
1) mounting a pressure sensor on the clamp; the pressure sensor can be simultaneously attached to the two end plates, or the pressure sensor can be attached to one end plate; in this embodiment, a pressure sensor is attached to one of the end plates.
2) Connecting the data acquisition instrument with a computer and opening a test system;
3) placing the single soft package lithium ion power battery between the two end plates, tightly suspending the bolts, wherein the strain signals of the pressure sensor are basically unchanged in the process of tightly suspending the bolts;
4) charging and discharging the lithium ion battery, wherein the charging and discharging multiplying power is 1C, the cut-off voltage of a charging point is 4.3V, and a testing system automatically and continuously monitors a strain signal of a pressure sensor on an end plate of the clamp and converts the strain signal into an expansion pressure curve in the charging and discharging process; fig. 3 is a schematic diagram of the corresponding relationship between the voltage and the expansion pressure of the lithium ion battery.
From the above description of the embodiments, it is obvious for those skilled in the art that the present application can be implemented by software and necessary general hardware, and of course, can also be implemented by hardware. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods described in the embodiments of the present application.
As mentioned above, a detailed description of the preferred embodiments of the invention has been given to enable those skilled in the art to make and practice the invention. Although the present invention has been described with reference to exemplary embodiments, those skilled in the art will appreciate that various modifications and changes can be made in the present invention without departing from the spirit or scope of the invention described in the appended claims. Thus, the present invention is not intended to be limited to the particular embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A test system for measuring lithium ion battery expansion stress, the system comprising a lithium ion battery clamp, a data acquisition instrument and a computer, the lithium ion battery clamp comprising:
a positioning bolt for positioning the lithium ion battery;
an upper end plate and a lower end plate for accommodating a lithium ion battery therebetween;
and the pressure sensor is placed at the lower part of the upper end plate and used for sensing the pressure born by the lithium ion battery.
2. A method performed by the system of claim 1, comprising:
s1: placing a lithium ion battery between an upper end plate and a lower end plate of the lithium ion battery clamp, and adjusting the distance between the upper end plate and the lower end plate of the lithium ion battery clamp to enable the pressure sensor to be tightly attached to the lithium ion battery;
s2: connecting the pressure sensor to a data collector and turning on the system, the data collector sending data sensed by the pressure sensor to a computer of the system;
s3: carrying out charge-discharge circulation on the lithium ion battery, wherein the system monitors a strain signal of a pressure sensor of the lithium ion battery clamp;
s4: and calculating the expansion pressure of the lithium ion battery according to the working curve of the pressure sensor.
3. The system of claim 2, wherein the first and second sensors are arranged in a single package,
in S1, a mounting area of the pressure sensor covers a majority of the area of the lithium ion battery.
4. The system of claim 2, wherein the first and second sensors are arranged in a single package,
in S3, the initial readings of the pressure sensors are consistent and have small values.
5. The system of claim 2, wherein the first and second sensors are arranged in a single package,
the lithium ion battery is characterized in that the lithium ion battery is a soft package lithium ion power battery.
6. The method of claim 2, wherein the first and second light sources are selected from the group consisting of,
the lithium ion battery is characterized in that the rated capacity of the lithium ion battery is 5 Ah.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911325478.0A CN110988718A (en) | 2019-12-20 | 2019-12-20 | Test system and method for measuring expansion stress of lithium ion battery |
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| CN201911325478.0A CN110988718A (en) | 2019-12-20 | 2019-12-20 | Test system and method for measuring expansion stress of lithium ion battery |
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| CN110988718A true CN110988718A (en) | 2020-04-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580001A (en) * | 2020-06-18 | 2020-08-25 | 东莞理工学院 | Battery volume change in-situ testing device |
| CN112108400A (en) * | 2020-08-07 | 2020-12-22 | 合肥国轩高科动力能源有限公司 | Test method for predicting cycle performance of soft package battery |
| CN112379287A (en) * | 2020-09-15 | 2021-02-19 | 万向一二三股份公司 | Test fixture for lithium ion power battery with large length-width ratio |
| CN113432766A (en) * | 2021-05-11 | 2021-09-24 | 天津大学 | Device for in-situ observation of battery operation |
| CN113552492A (en) * | 2020-04-23 | 2021-10-26 | 荣盛盟固利新能源科技有限公司 | Safety test protection device for lithium ion battery |
| CN113985293A (en) * | 2021-10-26 | 2022-01-28 | 远景动力技术(江苏)有限公司 | Lithium ion battery expansion rate prediction method and device, electronic device and storage medium |
| CN114946067A (en) * | 2020-07-31 | 2022-08-26 | 株式会社Lg新能源 | Battery cell holder comprising a membrane pressure sensor and method for measuring the swelling of a battery cell |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552492A (en) * | 2020-04-23 | 2021-10-26 | 荣盛盟固利新能源科技有限公司 | Safety test protection device for lithium ion battery |
| CN111580001A (en) * | 2020-06-18 | 2020-08-25 | 东莞理工学院 | Battery volume change in-situ testing device |
| CN114946067A (en) * | 2020-07-31 | 2022-08-26 | 株式会社Lg新能源 | Battery cell holder comprising a membrane pressure sensor and method for measuring the swelling of a battery cell |
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| CN113985293A (en) * | 2021-10-26 | 2022-01-28 | 远景动力技术(江苏)有限公司 | Lithium ion battery expansion rate prediction method and device, electronic device and storage medium |
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Application publication date: 20200410 |