CN113433470A - Device and method for measuring cell parameters - Google Patents
Device and method for measuring cell parameters Download PDFInfo
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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
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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- G—PHYSICS
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- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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- 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]
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Abstract
The disclosure relates to a device and a method for measuring cell parameters. The method comprises the following steps: measuring bucket, electric core mount, level sensor and treater. The charge and discharge equipment is used for measuring charge and discharge voltage or current of the battery cell to be measured; the liquid level sensor is used for acquiring liquid level height data of the measuring liquid, wherein the liquid level height data comprises liquid level height data of the to-be-measured battery cell in two states of not contacting the measuring liquid and completely immersing the to-be-measured battery cell in the measuring liquid; and the processor is used for acquiring the charging and discharging voltage or current of the battery cell to be tested and the liquid level height data and determining at least one measurement parameter of the battery cell to be tested. The embodiment of the disclosure can measure various measurement parameters of the battery cell to be measured simultaneously such as temperature, discharge rate and the like under the same detection condition, and has the advantage of high measurement accuracy.
Description
Technical Field
The present disclosure relates to the field of battery cell measurement technologies, and in particular, to a device and a method for measuring battery cell parameters.
Background
With the rapid development of the electric automobile industry, the electric automobile not only improves the production and life of people, but also reduces the emission of harmful gases, thereby protecting the environment better. The battery cell is used as a core component of an electric automobile, and the parameter performance of the battery cell directly affects the performance of the automobile, so that measurement and research on various parameters of the battery cell are necessary for optimization and improvement.
In the related art, the measurement of the parameters of the battery core is performed manually, the manual measurement is troublesome and laborious, the manual measurement is not accurate enough, only one kind of parameters can be measured at each time, and all the parameters of the battery core cannot be measured simultaneously.
Therefore, an automatic, fast and accurate cell parameter measuring device and method are needed.
Disclosure of Invention
To overcome at least one of the problems in the related art, the present disclosure provides a cell parameter measuring apparatus and method.
According to a first aspect of the embodiments of the present disclosure, there is provided a device for measuring a cell parameter, including:
the measuring barrel is internally provided with measuring liquid;
the battery cell fixing frame is arranged inside the measuring barrel and used for fixing a battery cell to be measured;
the charge and discharge equipment is electrically connected with the anode and the cathode of the battery cell to be tested and is used for charging or discharging the battery cell to be tested and measuring the charge and discharge voltage or current of the battery cell to be tested;
the liquid level sensor is used for acquiring liquid level height data of the measuring liquid, wherein the liquid level height data comprises liquid level height data of the electric core to be measured under two states that the electric core to be measured is not contacted with the measuring liquid and the electric core to be measured is completely immersed in the measuring liquid;
and the processor is electrically connected with the discharge equipment and the liquid level sensor and is used for acquiring the charge-discharge voltage or current of the battery cell to be detected and the liquid level height data and determining at least one measurement parameter of the battery cell to be detected.
In one possible implementation, the measuring parameters include: energy, capacity, volume, energy density and volume expansion rate of the battery cell.
In a possible implementation manner, the liquid level sensor includes a visual sensor, and the installation height of the visual sensor is adapted to the liquid level height of the measurement liquid, where the condition of adaptation includes that the height value of the liquid level height before and after the battery cell to be measured is immersed in the detection range of the visual sensor.
In a possible implementation manner, the apparatus further includes an identification component, the identification component is electrically connected to the processor, and the identification component is configured to identify identification information on the electrical core to be tested.
In one possible implementation, the identification component comprises a code reader.
In one possible implementation manner, the method further includes: and the display is electrically connected with the processor and is used for displaying the identification information of the battery cell to be measured and the measurement parameters.
In one possible implementation, the measuring liquid is made by mixing a non-conductive liquid with a color developing liquid according to a volume ratio of 500:1 to 10000: 1.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for measuring a cell parameter, including:
acquiring height data of the liquid level of the measuring liquid in the measuring barrel;
completely immersing the battery cell to be measured into the measuring liquid to obtain the height data of the liquid level of the measuring liquid;
performing charge and discharge processing on the battery cell to be tested by using charge and discharge equipment, and measuring charge and discharge voltage or current of the battery cell to be tested;
and determining at least one measurement parameter of the battery cell to be measured according to the liquid level height data and the charging and discharging voltage or current.
In one possible implementation, the measuring parameters include: energy, capacity, volume, energy density and volume expansion rate of the battery cell.
In a possible implementation manner, the determining at least one measurement parameter of the battery cell to be tested according to the liquid level height data and the charging and discharging voltage or current includes:
acquiring the charging time or the discharging time of the battery cell to be tested;
and determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current.
In a possible implementation manner, the determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current includes:
acquiring the bottom surface area of the measuring barrel;
and determining the volume of the battery cell to be tested according to the bottom surface area and the page height data.
In a possible implementation manner, the determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current includes:
acquiring the charging time or the discharging time of the battery cell to be tested;
determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current;
and determining the energy of the battery cell to be tested according to the capacity and the charge/discharge voltage of the battery cell to be tested.
In a possible implementation manner, after the determining the energy of the battery cell to be tested according to the capacity and the charge/discharge voltage of the battery cell to be tested, the method further includes:
acquiring the bottom surface area of the measuring barrel;
determining the volume of the battery cell to be tested according to the bottom surface area and the page height data;
and determining the energy density of the electric core to be tested according to the volume and the energy of the electric core to be tested.
In a possible implementation manner, the determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current includes:
acquiring liquid level height data acquired at every sub-period within a preset period, wherein the liquid level height data is obtained by repeatedly charging and discharging the to-be-detected battery cell by using the charging and discharging equipment within the preset period;
acquiring the bottom surface area of the measuring barrel;
determining a plurality of volume parameters of the battery cell to be tested in the preset time period according to the liquid level height data and the bottom surface area;
and determining the volume expansion rate of the electric core to be tested according to the volume parameters.
According to a third aspect of the embodiments of the present disclosure, there is provided a device for measuring a cell parameter, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: perform the method of any embodiment of the present disclosure.
According to a fourth aspect of embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, wherein instructions, when executed by a processor, enable the processor to perform the method according to any of the embodiments of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the embodiment of the disclosure can simultaneously measure various measurement parameters of the battery cell to be measured under the same detection condition, such as temperature, discharge rate and the like, has the beneficial effect of high measurement accuracy, and provides powerful data support for researching the performance of the battery cell. In addition, for the battery cores with different shapes or the battery cores with deformation, the volume measurement accuracy is high because the battery cores can be determined by measuring the liquid level data.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic block diagram of a cell parameter measurement apparatus according to an exemplary embodiment.
Fig. 2 is a flowchart illustrating a method for measuring a cell parameter according to an exemplary embodiment.
Fig. 3 is a schematic block diagram of a cell parameter measurement apparatus according to an exemplary embodiment.
Fig. 4 is a schematic block diagram of a cell parameter measurement apparatus according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In order to facilitate those skilled in the art to understand the technical solutions provided by the embodiments of the present disclosure, a technical environment for implementing the technical solutions is described below.
The cell is an electrochemical cell which comprises a positive electrode and a negative electrode and comprises an aluminum shell cell, a soft package cell and a cylindrical cell. The shape of the battery cell can comprise a cuboid and a plurality of irregular bodies, and the battery cell of the cuboid can also become the irregular bodies after being charged and discharged for a plurality of times. For the soft package battery, the lengths, widths and thicknesses of different positions are difficult to be consistent, and the measurement of the volume parameters of the battery cell is inconvenient. The related art cannot simultaneously measure other parameters than the volume, such as capacity, energy density, volume expansion rate in a state of multiple charging and discharging, and the like. Under the condition that parameters cannot be obtained simultaneously, the parameters measured under different conditions are put together to study, which affects the accuracy of the performance of the battery cell, such as studying the relationship between the volume expansion rate and the capacity, and the volume expansion rate is the relationship between the volume and the capacity when the battery cell is repeatedly charged, and when the volume and the capacity are measured respectively, it is required to ensure that other conditions such as the discharge rate and the temperature are consistent. Great inconvenience is brought to measurement, and the measurement is time-consuming and labor-consuming. Therefore, it is necessary to provide a measuring device for simultaneously measuring multiple parameters of the battery cell.
Based on the practical technical requirements similar to those described above, the embodiments of the present disclosure provide a cell parameter measurement device and method.
Fig. 1 is a schematic block diagram of a cell parameter measurement apparatus according to an exemplary embodiment. A device 100 for measuring cell parameters, comprising:
a measuring barrel 101, in which a measuring liquid is arranged;
the battery cell fixing frame 103 is arranged inside the measuring barrel and used for fixing a battery cell to be measured;
the charging and discharging equipment 107 is electrically connected with the anode and the cathode of the battery cell to be tested, and is used for charging or discharging the battery cell to be tested and measuring the charging and discharging voltage or current of the battery cell to be tested;
the liquid level sensor 108 is configured to obtain liquid level height data of the measurement liquid, where the liquid level height data includes liquid level height data of the to-be-measured battery cell in two states, that is, the to-be-measured battery cell is not in contact with the measurement liquid, and the to-be-measured battery cell is completely immersed in the measurement liquid;
and the processor 106 is electrically connected with the discharge equipment and the liquid level sensor, and is configured to acquire the charge-discharge voltage or current of the to-be-detected electric core and the liquid level height data, and determine at least one measurement parameter of the to-be-detected electric core.
In the embodiment of the present disclosure, the measuring barrel may include a transparent container, such as a plastic or glass material, and in one example, the measuring barrel may further include a scale, and when the liquid level of the measuring liquid changes, the scale is displayed. And the measuring barrel is internally provided with measuring liquid, and the measuring liquid is composed of non-conductive liquid. The battery cell fixing frame is arranged in the content of the measuring barrel, and in one example, the battery cell fixing frame is arranged at the bottom of the measuring barrel. In another example, the battery cell fixing frame may be further disposed on an inner side wall of the measuring barrel.
In the embodiment of the present disclosure, the charging and discharging device may include a separate charging device, such as a charging motor and a charging power source, a separate discharging device, such as a discharging motor, an electric fan, an electric water heater, an electric vehicle, or the like, or may include a charging and discharging machine integrating the charging motor and the discharging motor. And the positive and negative electrodes of the charging equipment are fixed on the positive and negative electrode lugs of the battery cell to be tested. It should be noted that the arrangement of the charging and discharging device is not limited to the above examples, and those skilled in the art may make other modifications within the spirit of the present application, and all such modifications are intended to be included within the scope of the present application as long as the functions and effects achieved by the charging and discharging device are the same as or similar to those of the present application.
In the embodiment of the present disclosure, the liquid level sensor may include a visual sensor, and the visual sensor obtains the liquid level height data by shooting an image of the to-be-measured battery cell not contacting the measurement liquid and an image of the to-be-measured battery cell completely immersed in the measurement liquid. In one example, when the cell to be measured is not immersed in the measurement liquid, the measurement liquid has a liquid level height which can be displayed through the scale of the measurement barrel, and the cell to be measured is captured by the visual sensor. And carrying out image processing on the captured image data to obtain liquid level height data. In another example, the liquid level sensor may further include a laser sensor, an ultrasonic sensor, and the like, and the liquid level of the measurement liquid is determined because the measurement barrel with the liquid and the measurement barrel without the liquid reflect electromagnetic waves or ultrasonic waves differently.
In the embodiment of the present disclosure, the processor may include devices with computer program processing functions, such as a CPU, a GPU, and an MCU, and the computer program is preset in the processor, and the following method can be automatically executed: and acquiring the charging and discharging voltage or current of the battery cell to be tested and the liquid level height data, and determining at least one measurement parameter of the battery cell to be tested. In the embodiment of the present disclosure, the measurement parameter may include energy, capacity, volume, energy density, cell volume expansion rate, and the like of the cell.
The embodiment of the disclosure can simultaneously measure various measurement parameters of the battery cell to be measured under the same detection condition, such as temperature, discharge rate and the like, has the beneficial effect of high measurement accuracy, and provides powerful data support for researching the performance of the battery cell. In addition, for the battery cores with different shapes or the battery cores with deformation, the volume measurement accuracy is high because the battery cores can be determined by measuring the liquid level data.
In a possible implementation manner, the liquid level sensor is a visual sensor, and the installation height of the visual sensor is adapted to the liquid level height of the measurement liquid, wherein the condition of adaptation includes that the height value of the liquid level height before and after the battery cell to be measured is immersed is within the detection range of the visual sensor. In one example, the installation height of the visual sensor or the distance from the measuring bucket may be adjusted so that the liquid level of the measuring liquid is located in the detection range of the visual sensor. In another example, the liquid level of the measurement liquid may be located in the detection range of the visual sensor by controlling the volume amount of the measurement liquid, for example, marking the addition range of the measurement liquid in the measurement barrel in advance.
In the embodiment of the disclosure, the liquid level height data of the measuring liquid can be automatically acquired through the vision sensor, and the accuracy is high.
In a possible implementation manner, the apparatus further includes an identification component, the identification component is electrically connected to the processor, and the identification component is configured to identify identification information on the electrical core to be tested.
In the embodiment of the present disclosure, the identification component may include a scanner, a code reader, a camera, and the like, and may be attached to or printed with an identifier in advance on the electrical core to be tested, and the identification component identifies the serial number of the electrical core to be tested, and the like. In one example, the identification information may include a two-dimensional code, a barcode, or the like.
In the embodiment of the disclosure, the identification information is set for the battery core to be measured, and is acquired through the identification component, so that after the relevant parameters are measured, the identification information can be stored in the corresponding battery core to be measured, and a large number of battery cores to be measured can be measured and stored.
In a possible implementation manner, the device for measuring the battery cell parameter further includes a display, and the display is electrically connected to the processor and is configured to display the identification information of the battery cell to be measured and the measurement parameter. In an example, the display may further display the acquired data, such as charging and discharging voltage or current of the battery cell to be tested, liquid level height data, and the like. In one example, the display may also be provided with a manual interactive interface, and operation controls for data, such as start, end, delete, move up and down, and the like, are set. The operation control can also comprise some control functions of the charging and discharging equipment, the liquid level sensor and the identification assembly, such as starting, adjusting, closing, setting the charging and discharging times, setting the charging and discharging time, charging and discharging steps and the like.
According to the embodiment of the disclosure, the components of the display are added, so that the man-machine interaction is facilitated, and the measured data is processed.
In one possible implementation, the measuring liquid is made by mixing a non-conductive liquid with a color developing liquid according to a volume ratio of 500:1 to 10000: 1.
In the embodiment of the present disclosure, the measurement liquid is composed of a non-conductive liquid, and the non-conductive liquid may include deionized water. In one example, a coloring liquid is added to the non-conductive liquid so that a visual sensor can more easily detect changes in page height. In one example, the non-conductive liquid and the color developing liquid are mixed according to a volume ratio of 500: 1. In another example, the non-conductive liquid is mixed with the color developing liquid according to a volume ratio of 1000: 1. A method for measuring a cell parameter according to the present disclosure is described in detail below with reference to fig. 2. Fig. 1 is a method flowchart of an embodiment of a method for measuring a cell parameter according to the present disclosure. Although the present disclosure provides method steps as illustrated in the following examples or figures, more or fewer steps may be included in the method based on conventional or non-inventive efforts. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the disclosed embodiments.
Specifically, as shown in fig. 2, an embodiment of the method for measuring a cell parameter provided by the present disclosure includes:
step S201, acquiring height data of the liquid level of the measuring liquid in the measuring barrel;
step S203, immersing the battery cell to be tested into the measuring liquid to obtain the height data of the liquid level of the measuring liquid;
step S205, performing charge and discharge processing on the battery cell to be tested by using charge and discharge equipment, and measuring charge and discharge voltage or current of the battery cell to be tested;
step S207, determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current.
In the embodiment of the present disclosure, step S201 obtains data of a liquid level of the measurement liquid in the measurement barrel, where the liquid level is an initial liquid level of the battery cell not placed in the measurement barrel. In step S203, the battery cell to be measured is completely immersed in the measurement liquid, and the liquid level height data of the measurement liquid is obtained. In step S207, determining at least one measurement parameter of the to-be-measured electric core according to the page height data and the charge and discharge voltage or current includes: and determining the volume parameter of the battery cell to be measured by using the difference value of the two times of height data and the bottom area of the measuring barrel, and multiplying the bottom area by the difference value. In another example, determining at least one measurement parameter of the battery cell to be tested according to the liquid level height data and the charging and discharging voltage or current may further include determining the capacity of the battery cell to be tested according to the charging current and the charging time or according to the discharging current and the discharging time.
In the embodiment of the disclosure, multiple measurement parameters of the battery cell to be measured can be measured simultaneously under the same detection condition, such as temperature, discharge rate and the like, so that the method has the beneficial effect of high measurement accuracy, and provides powerful data support for researching the performance of the battery cell. In addition, for the battery cores with different shapes or the battery cores with deformation, the volume measurement accuracy is high because the battery cores can be determined by measuring the liquid level data.
In one possible implementation, the measurement parameter includes: energy, capacity, volume, energy density and volume expansion rate of the battery cell.
In a possible implementation manner, the determining at least one measurement parameter of the battery cell to be tested according to the liquid level height data and the charging and discharging voltage or current includes:
acquiring the charging time or the discharging time of the battery cell to be tested;
and determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current.
In the embodiment of the present disclosure, a time when charging is started or discharging is started is obtained, and a time when charging is ended or discharging is ended is obtained. The charging time includes a period between the end of charging and the start of charging, and the discharging time includes a period between the end of discharging and the start of discharging. In one example, in the case where the charging current is a constant current, the cell capacity is a product of the charging current and a charging time, and in the case where the charging current is an alternating current, the cell capacity is an integrated value of the charging current over the charging time. In another example, in the case where the discharge current is a constant current, the cell capacity is a product of the discharge current and a discharge time, and in the case where the discharge current is an alternating current, the cell capacity is an integrated value of the discharge current over a charge time.
In a possible implementation manner, the determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current includes:
acquiring the bottom surface area of the measuring barrel;
and determining the volume of the battery cell to be tested according to the bottom surface area and the page height data.
According to the embodiment of the disclosure, the bottom surface of the measuring barrel can comprise a circle, a square and a rectangle, or even a polygon, and the volume of the battery cell to be measured can be obtained by multiplying the area of the bottom surface by the height difference of the page. In an example, the height difference may include a difference between a liquid level height at which the battery cell is placed in the measurement liquid and the initial liquid level height when the battery cell is not subjected to the charging and discharging process, and may further include performing a preset number of times, such as 50 times, 100 times, 150 times, and the like, on the battery cell to be measured, and a corresponding initial liquid level height.
The embodiment of the disclosure can measure the volume parameter of the electric core to be measured in real time under the condition of charging and discharging the electric property to be measured, and provides accurate data support for better research on the change of the volume parameter.
In a possible implementation manner, the determining at least one measurement parameter of the to-be-measured electric core according to the liquid level height data and the charge and discharge voltage or current includes:
acquiring the charging time or the discharging time of the battery cell to be tested;
determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current;
and determining the energy of the battery cell to be tested according to the capacity and the charge/discharge voltage of the battery cell to be tested.
In an embodiment of the present disclosure, the capacity of the electrical core to be tested may be determined according to any one of the above methods, and after the capacity of the electrical core to be tested is obtained, in one example, the energy of the electrical core to be tested may be determined according to the capacity measured by charging multiplied by a charging voltage, and in another example, the energy of the electrical core to be tested may be determined according to the capacity measured by discharging multiplied by a discharging voltage.
In a possible implementation manner, after the determining the energy of the battery cell to be tested according to the capacity and the charge/discharge voltage of the battery cell to be tested, the method further includes:
acquiring the bottom surface area of the measuring barrel;
determining the volume of the battery cell to be tested according to the bottom surface area and the page height data;
and determining the energy density of the electric core to be tested according to the volume and the energy of the electric core to be tested.
In the embodiment of the present disclosure, the volume of the electrical core to be measured may be determined according to any one of the methods in the embodiments, and the energy density of the electrical core to be measured is obtained by dividing the energy of the electrical core to be measured by the volume of the electrical core to be measured under the same condition.
The embodiment of the disclosure can simultaneously measure various measurement parameters of the cell to be measured under the same detection condition, such as temperature, discharge rate and the like, has the beneficial effects of high measurement accuracy,
in a possible implementation manner, the determining at least one measurement parameter of the battery cell to be tested according to the liquid level height data and the charging and discharging voltage or current includes:
acquiring liquid level height data acquired at every sub-period within a preset period, wherein the liquid level height data is obtained by repeatedly charging and discharging the to-be-detected battery cell by using the charging and discharging equipment within the preset period;
acquiring the bottom surface area of the measuring barrel;
determining a plurality of volume parameters of the battery cell to be tested in the preset time period according to the liquid level height data and the bottom surface area;
and determining the volume expansion rate of the electric core to be tested according to the volume parameters.
TABLE 1 cell volume expansion ratio
In this embodiment of the disclosure, the constraint time period may include half a year or a year, the electrical property to be measured is repeatedly charged and discharged during this time period, and according to the above method, the volume of the electrical core to be measured is measured once every preset time, for example, every month, and the volume expansion rate of the electrical core to be measured can be determined according to the volumes obtained by multiple measurements. Wherein the volume expansion ratio is the difference of the current measured volume minus the last measured volume divided by the last measured volume. In one example, table 1 records the capacity, volume, and volume expansion rate of three cells.
In a possible implementation manner, the relationship between the capacity SOH and the volume expansion rate (as shown in table 2 below) is further fitted to establish, and the characteristic rule of the battery core is effectively analyzed.
| Cell number | Battery core code number | Preliminary fitting result of script | Coefficient a | Coefficient b |
| 1 | LG005 | Capacity SOH ═ a ^ (volume expansion ratio) ^0.5+ b | 0.81 | 0.1 |
| 2 | LG006 | Capacity SOH ═ a ^ (volume expansion ratio) ^0.5+ b | 0.82 | 0.12 |
| 3 | LG007 | Capacity SOH ═ a ^ (volume expansion ratio) ^0.5+ b | 0.81 | 0.11 |
According to the embodiment of the disclosure, the charging and discharging equipment has the function of measuring the capacity (and the capacity SOH) of the battery cell by performing charging and discharging circulation on the battery cell, and the volume measuring barrel has the function of measuring the volume change of the battery cell, so that the volume change can be measured while charging and discharging are performed, and the relation between the capacity SOH and the volume expansion rate is established.
Fig. 3 is a block diagram illustrating a cell parameter measurement apparatus 800 according to an exemplary embodiment. For example, the apparatus 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 3, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.
The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 808 includes a screen that provides an output interface between the device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Fig. 4 is a block diagram illustrating a cell parameter measurement apparatus 1900 according to an exemplary embodiment. For example, the apparatus 1900 may be provided as a server. Referring to fig. 4, the device 1900 includes a processing component 1922 further including one or more processors and memory resources, represented by memory 1932, for storing instructions, e.g., applications, executable by the processing component 1922. The application programs stored in memory 1932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 1922 is configured to execute instructions to perform the above-described method.
The device 1900 may also include a power component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input/output (I/O) interface 1958. The device 1900 may operate based on an operating system stored in memory 1932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided that includes instructions, such as the memory 1932 that includes instructions, which are executable by the processing component 1922 of the apparatus 1900 to perform the above-described method. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (11)
1. A device for measuring cell parameters, comprising:
the measuring barrel is internally provided with measuring liquid;
the battery cell fixing frame is arranged inside the measuring barrel and used for fixing a battery cell to be measured;
the charge and discharge equipment is electrically connected with the anode and the cathode of the battery cell to be tested and is used for charging or discharging the battery cell to be tested and measuring the charge and discharge voltage or current of the battery cell to be tested;
the liquid level sensor is used for acquiring liquid level height data of the measuring liquid, wherein the liquid level height data comprises liquid level height data of the electric core to be measured under two states that the electric core to be measured is not contacted with the measuring liquid and the electric core to be measured is completely immersed in the measuring liquid;
and the processor is electrically connected with the discharge equipment and the liquid level sensor and is used for acquiring the charge-discharge voltage or current of the battery cell to be detected and the liquid level height data and determining at least one measurement parameter of the battery cell to be detected.
2. The device of claim 1, wherein the liquid level sensor comprises a visual sensor, and the installation height of the visual sensor is adapted to the liquid level height of the measurement liquid, wherein the adapted condition includes that the height value of the liquid level height before and after the immersion of the cell to be measured is within the detection range of the visual sensor.
3. The device of claim 1, further comprising an identification component electrically connected to the processor, wherein the identification component is configured to identify the identification information on the electrical core to be tested.
4. The apparatus of claim 1, further comprising: and the display is electrically connected with the processor and is used for displaying the identification information of the battery cell to be measured and the measurement parameters.
5. The apparatus of claim 1, wherein the measurement parameters comprise: energy, capacity, volume, energy density and volume expansion rate of the battery cell.
6. A method for measuring cell parameters is characterized by comprising the following steps:
acquiring height data of the liquid level of the measuring liquid in the measuring barrel;
completely immersing the battery cell to be measured into the measuring liquid to obtain the height data of the liquid level of the measuring liquid;
performing charge and discharge processing on the battery cell to be tested by using charge and discharge equipment, and measuring charge and discharge voltage or current of the battery cell to be tested;
and determining at least one measurement parameter of the battery cell to be measured according to the liquid level height data and the charging and discharging voltage or current.
7. The method according to claim 6, wherein the determining at least one measurement parameter of the cell under test according to the liquid level data and the charge-discharge voltage or current comprises:
acquiring the charging time or the discharging time of the battery cell to be tested;
and determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current.
8. The method according to claim 6, wherein the determining at least one measurement parameter of the cell under test according to the liquid level data and the charge-discharge voltage or current comprises:
acquiring the bottom surface area of the measuring barrel;
and determining the volume of the battery cell to be measured according to the bottom surface area and the liquid level height data.
9. The method according to claim 6, wherein the determining at least one measurement parameter of the cell to be tested according to the liquid level data and the charge and discharge voltage or current comprises:
acquiring the charging time or the discharging time of the battery cell to be tested;
determining the capacity of the battery cell to be tested according to the charging time and the charging current or according to the discharging time and the discharging current;
and determining the energy of the battery cell to be tested according to the capacity and the charge/discharge voltage of the battery cell to be tested.
10. The method of claim 6, wherein after the determining the energy of the cell to be tested according to the capacity and the charge/discharge voltage of the cell to be tested, the method further comprises:
acquiring the bottom surface area of the measuring barrel;
determining the volume of the battery cell to be tested according to the bottom surface area and the liquid level height data;
and determining the energy density of the electric core to be tested according to the volume and the energy of the electric core to be tested.
11. The method according to claim 6, wherein the determining at least one measurement parameter of the cell to be tested according to the liquid level data and the charge and discharge voltage or current comprises:
acquiring liquid level height data acquired at every sub-period within a preset period, wherein the liquid level height data is obtained by repeatedly charging and discharging the to-be-detected battery cell by using the charging and discharging equipment within the preset period;
acquiring the bottom surface area of the measuring barrel;
determining a plurality of volume parameters of the battery cell to be tested in the preset time period according to the liquid level height data and the bottom surface area;
and determining the volume expansion rate of the electric core to be tested according to the volume parameters.
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