CN212363109U - Lithium ion battery lithium analysis monitoring system - Google Patents
Lithium ion battery lithium analysis monitoring system Download PDFInfo
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- CN212363109U CN212363109U CN202021219837.2U CN202021219837U CN212363109U CN 212363109 U CN212363109 U CN 212363109U CN 202021219837 U CN202021219837 U CN 202021219837U CN 212363109 U CN212363109 U CN 212363109U
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Abstract
The utility model relates to a lithium ion battery technical field specifically provides a lithium ion battery analyses monitoring system of lithium. The monitoring system includes: the thickness measuring device is used for collecting thickness data of the lithium ion battery in the circulating charging and discharging process, the thickness data comprises thickness change data at different positions on the lithium ion battery, and the online monitoring device is used for drawing a corresponding thickness change rate curve according to the thickness data and judging the lithium analysis state inside the lithium ion battery. The utility model discloses in, because lithium ion battery is dynamic change at the thickness of circulation charge-discharge in-process, through the change of real-time supervision battery thickness data, judge on line whether lithium ion battery analyses lithium, simple swift.
Description
Technical Field
The utility model relates to a lithium ion battery technical field specifically relates to a lithium ion battery analyses monitoring system of lithium.
Background
Lithium ion batteries have attracted more and more attention in recent years as green energy sources, and with the development of lithium ion battery technology, how to improve the service life and the safety of the lithium ion batteries becomes a target of researchers. The cell life test is one of the conventional items of the battery test, and one of the factors influencing the cell life and the safety thereof is the lithium separation of the lithium ion battery, so that the prediction of whether the lithium ion battery separates lithium becomes particularly important. In the prior art, the lithium ion battery is charged after being charged and discharged for many times, then the battery is disassembled in a disassembling room, whether the battery analyzes lithium is judged by checking the condition of a pole piece interface, the working time is long, the efficiency is low, and the lithium analysis condition of the battery cannot be judged on line.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lithium ion battery analyses monitoring system of lithium aims at solving prior art and judges that there is inefficiency and unable on-line monitoring and the problem of judging when lithium ion battery's the lithium condition of analysing.
The technical scheme of the utility model as follows:
a lithium ion battery lithium evolution monitoring system, comprising:
the thickness measuring device is used for collecting thickness data of the lithium ion battery in the cyclic charge and discharge process, wherein the thickness data comprises thickness change data at different positions on the lithium ion battery;
the online monitoring device comprises a data receiving module, a data processing module and a judging module;
the data receiving module is used for receiving thickness data of the lithium ion battery;
the data processing module is used for drawing a corresponding thickness change rate curve according to the thickness data of the lithium ion battery;
the judging module comprises:
the first judgment unit is used for judging that the lithium ion battery does not analyze lithium when the thickness change rate deviation of different positions on the lithium ion battery does not exceed a threshold value, the growth trend of each thickness change rate curve is gentle, and a plateau area appears;
and the second judging unit is used for judging lithium separation of the lithium ion battery when the thickness change rate deviation of different positions on the lithium ion battery and/or any one thickness change rate curve shows a steep increasing trend.
Preferably, the monitoring system performs a cycle charge and discharge test on the lithium ion battery under the conditions of constant temperature and constant voltage, wherein the cycle charge and discharge frequency is 200-2000.
Preferably, the data processing module includes:
the first calculating unit is used for respectively calculating the thickness change rate An of the lithium ion battery according to the thickness change data of at least two positions on the lithium ion battery, and n is a positive integer not less than 2;
the method for calculating the thickness change rate An at different positions on the lithium ion battery comprises the following steps:
and the first drawing unit is used for drawing thickness change rate curves at different positions on the lithium ion battery according to the thickness change rate An.
Preferably, the monitoring system further comprises:
the capacity acquisition unit is used for acquiring capacity data of the lithium ion battery in the cyclic charge and discharge process;
the second calculating unit is used for calculating a capacity attenuation rate according to the capacity data of the lithium ion battery;
the second drawing unit is used for drawing a capacity decay rate curve according to the capacity decay rate;
the third judgment unit is used for judging the lithium separation condition of the lithium ion battery by taking the thickness change rate curve as a main part and taking the capacity attenuation rate curve as an auxiliary part;
when the descending trend of the capacity decay rate curve is flat, judging that the lithium ion battery does not analyze lithium;
and when the capacity decay rate curve shows a sudden drop trend, judging that the lithium ion battery separates lithium.
Preferably, the thickness measuring device includes: the device comprises a support, a lower pressing plate fixed on the support and used for placing a lithium ion battery, an upper pressing plate which is arranged above the lower pressing plate in parallel and adjustable in position, and at least two laser range finders which are arranged at different positions between the upper pressing plate and the lower pressing plate and used for measuring the thickness of the lithium ion battery.
Preferably, the thickness measuring device further comprises a drive assembly mounted on the support;
the driving assembly comprises a motor, a plurality of adjusting columns and a connecting plate, the adjusting columns are electrically connected with the motor, the bottom ends of the adjusting columns are fixedly connected with the upper pressing plate through the connecting plate, and the driving assembly drives the upper pressing plate to move towards/away from the direction of the lithium ion battery and enables the upper pressing plate to generate pressure on the lithium ion battery.
Preferably, the thickness measuring device further comprises a pressure sensor arranged on the lower surface of the upper pressure plate, the pressure sensor is indirectly contacted with the lithium ion battery through a partition plate, and the pressure sensor is used for detecting and outputting the pressure value applied to the lithium ion battery in real time.
Preferably, in the cyclic charge and discharge process of the lithium ion battery, the driving assembly drives the upper pressure plate to move and enables the lithium ion battery to be constantly pressed.
Preferably, the laser range finder comprises a signal transmitter mounted on the upper press plate/the lower press plate, a signal receiver mounted on the lower press plate/the upper press plate, and a calculation unit electrically connected with the signal transmitter and the signal receiver respectively, wherein the calculation unit is used for calculating and outputting the real-time distance between the upper press plate and the lower press plate according to the received laser signal.
Preferably, the real-time distance between the upper pressing plate and the lower pressing plate is characterized by the battery thickness of the lithium ion battery in the cyclic charge and discharge process.
According to the technical scheme, the lithium analysis state in the lithium ion battery is judged by collecting the thickness data of the lithium ion battery in the cyclic charge and discharge process and according to the drawn thickness change rate curve. Because the thickness of the lithium ion battery is dynamically changed in the process of cyclic charging and discharging, whether the lithium ion battery separates lithium is judged on line by monitoring the change of the thickness of the battery in real time, and the working process is simple, convenient and quick and has high efficiency.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method for monitoring lithium evolution in a lithium ion battery;
FIG. 2 is a schematic diagram of a monitoring system for lithium evolution of a lithium ion battery;
FIG. 3 is a schematic structural view of a thickness measuring device;
FIG. 4 is a graph of the rate of change in thickness versus the rate of decay in capacity in example 1;
FIG. 5 is a graph of the rate of change in thickness versus the rate of decay in capacity in example 2.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
As shown in fig. 1, the utility model provides a lithium ion battery lithium separation monitoring method, which comprises the following steps:
s1, carrying out a cyclic charge and discharge test on the lithium ion battery, and collecting thickness data of the lithium ion battery in the cyclic charge and discharge process;
and S2, drawing a corresponding thickness change rate curve according to the thickness data of the lithium ion battery, and judging the lithium analysis state in the lithium ion battery.
Correspondingly, the utility model also provides a lithium ion battery analyses monitoring system of lithium, as shown in figure 2, this monitoring system includes:
and the thickness measuring device is used for acquiring thickness data of the lithium ion battery in the cyclic charge and discharge process, wherein the thickness data comprises thickness change data at different positions on the lithium ion battery.
The on-line monitoring device comprises a data receiving module, a data processing module and a judging module.
The data receiving module is in communication connection with the thickness measuring device and used for receiving the thickness data of the lithium ion battery. And the data processing module is connected with the data receiving module and used for drawing a corresponding thickness change rate curve according to the thickness data of the lithium ion battery.
And the judging module is used for judging whether the lithium ion battery separates lithium or not according to the thickness change rate curve.
Specifically, the judging module comprises:
and the first judgment unit is used for judging that the lithium ion battery does not analyze lithium when the thickness change rate deviation of different positions on the lithium ion battery does not exceed a threshold value, the growth trend of each thickness change rate curve is gentle, and a plateau area appears.
And the second judging unit is used for judging lithium separation of the lithium ion battery when the thickness change rate deviation of different positions on the lithium ion battery exceeds a threshold value and/or any one thickness change rate curve shows a steep increasing trend.
According to the technical scheme, the thickness of the lithium ion battery is dynamically changed along with the cyclic charge and discharge of the lithium ion battery, and a thickness change rate curve is drawn according to the obtained thickness data so as to monitor the change of the thickness of the battery in real time and judge whether the lithium ion battery analyzes lithium on line.
Further, the utility model discloses in the scheme, monitoring system carries out the test of circulating charge and discharge to lithium ion battery under constant temperature, constant voltage condition. Preferably, the number of cyclic charge and discharge is 200-2000.
Further, collecting thickness data at different locations on the lithium ion battery includes: the method includes collecting thickness data of at least two positions on the lithium ion battery in a cyclic charge and discharge process, for example, collecting thicknesses of two ends of the lithium ion battery, or collecting thicknesses of the middle and the edge of the lithium ion battery, and the like.
According to a specific embodiment, the dynamic range of the thickness of the lithium ion battery ranges from 4mm to 16 mm.
Further, the data processing module comprises:
the first calculating unit is used for respectively calculating the thickness change rate An of the lithium ion battery according to the thickness change data of at least two positions on the lithium ion battery, wherein n is a positive integer not less than 2, namely the thickness change rates A1 and A2.. An of the lithium ion battery are respectively calculated according to the thicknesses of at least two positions on the lithium ion battery;
in the cyclic charge-discharge process, the calculation method of the thickness change rate An at different positions on the lithium ion battery comprises the following steps:
and the first drawing unit is used for drawing thickness change rate curves at different positions on the lithium ion battery according to the thickness change rate An, and the thickness change rate curves comprise at least two thickness change rate curves.
According to a specific embodiment, the lithium ion battery has a thickness variation rate of-5% to 30%.
According to a specific embodiment, the threshold value for the deviation of the rate of thickness change at different locations on the lithium ion battery is 6-30%. That is, when any one of the thickness change rate curves is taken as a reference curve, and the deviation of the thickness change rate of the other thickness change rate curves from the reference curve along with the change of the time is between 6 and 30 percent, the lithium ion battery is judged not to be separated out lithium.
Further, the monitoring system further comprises:
and the capacity acquisition unit is used for acquiring the capacity data of the lithium ion battery in the cyclic charge and discharge process.
And the second calculating unit is used for calculating the capacity attenuation rate according to the capacity data of the lithium ion battery.
And the second drawing unit is used for drawing a capacity decay rate curve according to the capacity decay rate of the lithium ion battery.
And the third judgment unit is used for judging the lithium separation condition of the lithium ion battery by taking the thickness change rate curve as a main part and taking the capacity attenuation rate curve as an auxiliary part.
The capacity decay rate curve is usually used as a secondary judgment factor for whether lithium ions are analyzed or not, or is used for verifying the judgment accuracy of the thickness change rate curve, and the judgment mechanism is as follows: when the descending trend of the capacity decay rate curve is gentle, judging that the lithium ion battery does not analyze lithium; and when the capacity decay rate curve shows a sudden drop trend, judging that the lithium ion battery separates lithium.
The utility model provides a thickness measurement device is used for at circulation charge-discharge in-process real-time measurement lithium ion battery's thickness. As shown in fig. 3, the thickness measuring apparatus includes: the device comprises a support 1, a lower pressing plate 3 fixed on the support 1 and used for placing a lithium ion battery, an upper pressing plate 2 which is arranged above the lower pressing plate 3 in parallel and adjustable in position, and at least two laser range finders which are arranged at different positions between the upper pressing plate 2 and the lower pressing plate 3 and used for measuring the thickness of the lithium ion battery.
In the present invention, as shown in fig. 3, the support 1 is an i-shaped three-dimensional support, and is composed of two flat plates and two upright posts respectively and vertically connected between the two flat plates. The upper press plate 2 and the lower press plate 3 are parallel and horizontally arranged, and the horizontal plane is determined by the horizontal plane of the operating table. The lower pressing plate 3 is fixed on the support 1, the lithium ion battery is placed on the upper surface of the lower pressing plate 3, and the upper pressing plate 2 is located above the lower pressing plate 3 and is adjustable in distance with the lower pressing plate 3.
According to a particular embodiment, the upper platen 2 and the lower platen 3 have a thickness of 8-20mm, preferably 8-15 mm.
According to a specific embodiment, the upper press plate 2 and the lower press plate 3 are made of bakelite plates, PVC plates or PP plates, preferably bakelite plates.
Further, the thickness measuring apparatus further includes a driving assembly mounted on the support 1. This drive assembly includes a motor 4, a plurality of regulation post 5 to and a connecting plate 6, adjusts post 5 and 4 electric connection of motor, and connecting plate 6 and 2 fixed connection of top board are passed through to the bottom of adjusting post 5, and this motor 4 drive is adjusted 5 and is gone up and down to drive connecting plate 6 and with the 2 motion of top board of connecting plate 6 fixed connection. The utility model discloses in, motor 4 drive top board 2 is to being close to/keeping away from lithium ion battery direction removal and making top board 2 generate pressure to lithium ion battery.
Further, the thickness measuring apparatus further includes a pressure sensor (not shown in fig. 3) provided on a lower surface of the upper platen 3. The pressure sensor is indirectly contacted with the lithium ion battery through a partition plate and is used for detecting and outputting the value of the pressure applied to the lithium ion battery in real time.
The contact surface of the upper pressure plate 2 and the lithium ion battery in the thickness measuring device is smooth and wear-resistant, in the circulating charge and discharge process of the lithium ion battery, along with the dynamic change of the thickness of the lithium ion battery, a pressure sensor arranged between the upper pressure plate 2 and the lithium ion battery outputs the monitored pressure in real time, and a driving assembly drives the upper pressure plate 2 to move and enables the lithium ion battery to be constantly pressed.
Laser rangefinders are often used to make high precision distance measurements. The utility model provides a laser range finder is including installing signal transmitter on top board 2/lower clamp plate 3, installing signal receiver on 3/top board 2 of lower clamp plate to and the distance calculation unit of being connected with signal transmitter and signal receiver electricity respectively. The distance calculation unit is used for calculating and outputting the real-time distance between the upper pressing plate 2 and the lower pressing plate 3 according to the received laser signals, and the output real-time distance is the battery thickness of the lithium ion battery in the cyclic charge and discharge process.
The utility model provides a thickness measurement device simple structure, convenient to use can gather lithium ion battery at the thickness data of circulation charge-discharge in-process fast to analyze lithium ion battery through the on-line monitoring device in real time and whether analyse lithium, in order to avoid extravagant test resource.
According to the above technical solution, two embodiments are provided to assist in demonstration.
The lithium ion battery is a soft package power battery, the positive active material of the lithium ion battery is a ternary material, the negative active material of the lithium ion battery is graphite, and the electrolyte is conventional electrolyte for the power battery.
Example 1
A lithium ion battery was assembled between the upper and lower pressing plates of the thickness measuring device, and under the conditions of a temperature of 25 ℃ and a temperature of 1C/1C, 400 charge and discharge cycles were performed, and the capacity data of the lithium ion battery and the thickness data of both ends of the lithium ion battery in each cycle were measured, and the capacity fade rate and the thickness change rate were calculated, respectively, and the capacity fade rate curve and the thickness change rate curve as shown in fig. 4 were plotted.
As can be seen from the thickness change rate curve in fig. 4, in the process of 400 cycles of charge and discharge, the thickness change rate curve 1 and the thickness change rate curve 2 intersect each other at all times, there is no obvious difference, the deviation value thereof obviously does not exceed the threshold, and the two thickness change rate curves have a gentle increasing trend, and neither of the two thickness change rate curves has a steep increasing slope, and at the same time, the capacity decay rate curve has a gentle decreasing trend, so that it can be determined that no lithium is separated from the lithium ion battery.
In order to ensure the accuracy of the result, the experimenter also carries out disassembly verification on the lithium ion battery, and the disassembly result shows that the battery does not separate lithium.
Example 2
The lithium ion battery was assembled between the upper and lower press plates of the thickness measuring device, and under the conditions of a temperature of 25 ℃ and a temperature of 1.5C/1C, 440 charge and discharge cycles were performed, and the capacity data of the lithium ion battery and the thickness data of both ends of the lithium ion battery in each cycle were measured, and the capacity fade rate and the thickness change rate were calculated, respectively, and the capacity fade rate curve and the thickness change rate curve shown in FIG. 3 were plotted.
As can be seen from the thickness change rate curve in fig. 3, during 440 cycles of charge and discharge, the thickness change rate curve 1 and the thickness change rate curve 2 both show steep slopes during 320 th 440 cycles of charge and discharge, and meanwhile, the capacity decay rate curve shows a sudden drop trend, so that it is determined that the lithium ion battery is lithium-analyzed.
And (5) carrying out disassembly verification to separate lithium from the lithium ion battery.
According to the utility model provides a thickness measurement device can make lithium ion battery carry out the circulation under constant temperature, constant voltage condition and charge and discharge the test, gathers the thickness change data of battery in real time, still judges whether lithium ion battery analyses the lithium through the thickness change data of on-line monitoring device analysis battery and on line.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A monitoring system for lithium evolution of a lithium ion battery, the monitoring system comprising:
the thickness measuring device is used for collecting thickness data of the lithium ion battery in the cyclic charge and discharge process, wherein the thickness data comprises thickness change data at different positions on the lithium ion battery;
the online monitoring device comprises a data receiving module, a data processing module and a judging module;
the data receiving module is used for receiving thickness data of the lithium ion battery;
the data processing module is used for drawing a corresponding thickness change rate curve according to the thickness data of the lithium ion battery;
the judging module comprises:
the first judgment unit is used for judging that the lithium ion battery does not analyze lithium when the thickness change rate deviation of different positions on the lithium ion battery does not exceed a threshold value, the growth trend of each thickness change rate curve is gentle, and a plateau area appears;
and the second judging unit is used for judging lithium separation of the lithium ion battery when the thickness change rate deviation of different positions on the lithium ion battery exceeds a threshold value and/or any one thickness change rate curve shows a steep increasing trend.
2. The monitoring system of claim 1, wherein the monitoring system performs a cycle charge and discharge test on the lithium ion battery under constant temperature and constant pressure conditions, and the number of cycles of charge and discharge is 200-2000.
3. The monitoring system of claim 1, wherein the data processing module comprises:
the first calculating unit is used for respectively calculating the thickness change rate An of the lithium ion battery according to the thickness change data of at least two positions on the lithium ion battery, and n is a positive integer not less than 2;
the method for calculating the thickness change rate An at different positions on the lithium ion battery comprises the following steps:
and the first drawing unit is used for drawing thickness change rate curves at different positions on the lithium ion battery according to the thickness change rate An.
4. The monitoring system of claim 1, further comprising:
the capacity acquisition unit is used for acquiring capacity data of the lithium ion battery in the cyclic charge and discharge process;
the second calculating unit is used for calculating a capacity attenuation rate according to the capacity data of the lithium ion battery;
the second drawing unit is used for drawing a capacity decay rate curve according to the capacity decay rate;
the third judgment unit is used for judging the lithium separation condition of the lithium ion battery by taking the thickness change rate curve as a main part and taking the capacity attenuation rate curve as an auxiliary part;
when the descending trend of the capacity decay rate curve is flat, judging that the lithium ion battery does not analyze lithium;
and when the capacity decay rate curve shows a sudden drop trend, judging that the lithium ion battery separates lithium.
5. The monitoring system of claim 1, wherein the thickness measuring device comprises: the device comprises a support, a lower pressing plate fixed on the support and used for placing a lithium ion battery, an upper pressing plate which is arranged above the lower pressing plate in parallel and adjustable in position, and at least two laser range finders which are arranged at different positions between the upper pressing plate and the lower pressing plate and used for measuring the thickness of the lithium ion battery.
6. The monitoring system of claim 5, wherein the thickness measuring device further comprises a drive assembly mounted on the bracket;
the driving assembly comprises a motor, a plurality of adjusting columns and a connecting plate, the adjusting columns are electrically connected with the motor, the bottom ends of the adjusting columns are fixedly connected with the upper pressing plate through the connecting plate, the motor drives the upper pressing plate to move towards/away from the direction of the lithium ion battery and enable the upper pressing plate to generate pressure on the lithium ion battery.
7. The monitoring system of claim 6, wherein the thickness measuring device further comprises a pressure sensor disposed on a lower surface of the upper platen;
the pressure sensor is indirectly contacted with the lithium ion battery through a partition plate and is used for detecting and outputting the pressure value borne by the lithium ion battery in real time.
8. The monitoring system of claim 7, wherein the driving assembly drives the upper pressure plate to move and keep the lithium ion battery constantly pressed as the thickness of the lithium ion battery dynamically changes during cyclic charging and discharging.
9. The monitoring system of claim 6, wherein the laser range finder comprises a signal transmitter mounted on the upper press plate/the lower press plate, a signal receiver mounted on the lower press plate/the upper press plate, and a distance calculation unit electrically connected with the signal transmitter and the signal receiver respectively, wherein the distance calculation unit is used for calculating and outputting the real-time distance between the upper press plate and the lower press plate according to the received laser signal.
10. The monitoring system of claim 9, wherein the real-time distance between the upper platen and the lower platen is characterized by a cell thickness of the lithium ion battery during cyclic charging and discharging.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113075566A (en) * | 2021-06-07 | 2021-07-06 | 四川新能源汽车创新中心有限公司 | Lithium-ion power battery lithium-separation detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113075566A (en) * | 2021-06-07 | 2021-07-06 | 四川新能源汽车创新中心有限公司 | Lithium-ion power battery lithium-separation detection method |
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