CN111256629A - Instrument and method for measuring volume change of battery cell - Google Patents
Instrument and method for measuring volume change of battery cell Download PDFInfo
- Publication number
- CN111256629A CN111256629A CN202010139124.3A CN202010139124A CN111256629A CN 111256629 A CN111256629 A CN 111256629A CN 202010139124 A CN202010139124 A CN 202010139124A CN 111256629 A CN111256629 A CN 111256629A
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- measuring
- connecting arm
- battery cell
- bracket
- sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
Abstract
The invention discloses an instrument and a method for measuring the volume change of a battery cell, and relates to the field of battery cell measurement. The instrument for measuring the volume change of the battery cell comprises a shell, a high-precision mechanical sensing system and a measuring end. The measuring end comprises a measuring support, a fixture for fixing the electric core to be tested and a container for containing bath lotion and the electric core, the measuring end is connected to the high-precision mechanical sensing system, and the fixture is connected to the measuring support. The battery cell is placed on the clamp and immersed in liquid, the buoyancy change of the battery cell is monitored in real time through the high-precision mechanical sensing system, and then the volume change of the battery cell is calculated. The instrument can record the volume change of the battery cell in the whole charging and discharging process in situ, and further obtain the accurate gas production volume and gas production rate of the battery cell in each stage.
Description
Technical Field
The invention relates to the field of battery cell measurement, in particular to an instrument and a method for measuring battery cell volume change.
Background
The existing methods for measuring the volume change of the battery core comprise a single volume measurement method, an internal pressure measurement method and the like. The single volume measurement method is to measure the volume of the battery cell by using a drainage method. In the internal pressure measurement method, a pressure measuring device is arranged in a battery cell, and the volume change of the battery cell is represented by the pressure change.
The disadvantages of single volume measurements are:
(1) the method can only carry out single-point measurement, and cannot obtain the volume change and the gas production rate of the whole formation process of the battery cell;
(2) ex situ measurement, which is susceptible to external environment during transfer measurement;
(3) the common balance is adopted for weighing, so that long-time online stable high-precision measurement cannot be realized;
(4) the test needs to consume a large number of battery cores, the cost is high, and the influence of the inconsistency of the battery cores cannot be eliminated.
The disadvantages of the internal pressure measurement method are:
(1) the mode of the built-in pressure measuring device is complicated to operate;
(2) the method is only suitable for steel shell battery cores;
(3) the manufacturing cost is high.
Disclosure of Invention
In order to solve the problem of measuring the volume of the battery cell, the invention provides an instrument for measuring the volume change of the battery cell, which comprises a shell, a high-precision mechanical sensing system and a measuring end, wherein the shell is provided with a plurality of measuring holes; wherein:
the high-precision mechanical sensing system comprises a high-precision weight sensor and a sensor bracket, and the high-precision weight sensor is fixedly arranged in the shell; the sensor bracket is arranged on the high-precision weight sensor, and two ends of the sensor bracket exceed the high-precision weight sensor;
the measuring end comprises a measuring bracket which is connected with the sensor bracket and is positioned below the sensor bracket;
the shell is provided with a holding cavity for placing the battery cell sample, and the measuring support part is located in the holding cavity to be connected with the battery cell sample.
Preferably, the measuring end further comprises a clamp for fixing the cell sample and a container for containing bath solution and the cell sample; the measuring bracket comprises a first connecting arm, a second connecting arm and a third connecting arm, one end of the first connecting arm and one end of the second connecting arm are respectively connected with two ends of the sensor bracket, and the third connecting arm is transversely connected with the other end of the first connecting arm and the other end of the second connecting arm; the clamp is connected to the third connecting arm; the container is arranged in the accommodating cavity and is positioned below the clamp.
Preferably, the container is a double-layer beaker, the outer wall of the double-layer beaker is provided with a water inlet and a water outlet, and the interlayer of the double-layer beaker can be filled with water to heat the bath lotion and the battery cell in a water bath manner.
Preferably, an upper inner plate and a lower inner plate are further arranged in the shell; the high-precision weight sensor is arranged on the upper inner plate, and the lower inner plate and the bottom plate of the shell form the accommodating cavity; the first connecting arm and the second connecting arm of the measuring support penetrate through the upper inner plate and the lower inner plate in a non-contact manner and extend into the accommodating cavity; the third connecting arm is located in the accommodating cavity.
Preferably, the device further comprises a sensing system protection device; the sensing system protection device is arranged between the upper inner plate and the lower inner plate and is connected with the first connecting arm and the second connecting arm so as to disconnect the conduction force of the measuring bracket to the sensor bracket by providing a supporting force; or removing the supporting force to restore the conduction force of the measuring bracket to the sensor bracket.
Preferably, the sensing system protection device comprises a cross bar and a driving mechanism, two ends of the cross bar are respectively connected with the first connecting arm and the second connecting arm, a driving end of the driving mechanism abuts against the lower portion of the cross bar, and a fixed end of the driving mechanism is fixed on the lower inner plate; and flexible connecting sections are arranged between the first connecting arm and the sensor bracket and between the second connecting arm and the sensor bracket.
Preferably, one end of the flexible connecting section is connected with the sensor bracket, and the other end of the flexible connecting section is connected with the first connecting arm or the second connecting arm, or the other end of the flexible connecting section penetrates through the upper inner plate and is connected with the cross bar in a non-contact manner.
Preferably, the flexible connecting section is a rope of a non-rigid material; the driving mechanism can drive the cross rod to move upwards, so that the two ropes are bent, and the conduction force of the measuring bracket to the sensor bracket is disconnected; or the output end of the driving mechanism moves downwards until the output end of the driving mechanism is separated from the cross rod, so that the two ropes are straightened, and the conduction force of the measuring bracket to the sensor bracket is restored.
The invention also provides a method for measuring the volume change of the battery cell, which is applied to the instrument for measuring the volume change of the battery cell, and comprises the following steps: placing bath liquid in a container, placing a battery cell to be measured on the clamp and immersing the battery cell into the bath liquid; and carrying out charging and discharging operation on the battery cell, monitoring the buoyancy change of the battery cell in real time through the high-precision mechanical sensing system, and calculating the volume change of the battery cell according to the buoyancy change.
Preferably, the apparatus for measuring the volume change of the battery cell is further provided with a sensing system protection device: when the measurement is not started, the conduction force of the measurement bracket to the sensor bracket is cut off through the sensing system protection device; when the measurement is started, the conduction force of the measurement bracket to the sensor bracket is recovered through the sensing system protection device.
The invention has the beneficial effects that:
(1) the volume change of the battery cell in the whole charging and discharging process can be recorded in situ, so that the accurate gas production volume and gas production rate of the battery cell in each stage can be obtained;
(2) the measuring process is not easily influenced by the external environment;
(3) the operation is simple, the cost is low, the cell does not need to be moved in the measurement process, and a large number of cells do not need to be consumed to participate in the test;
(4) a high-precision mechanical induction system is adopted, so that the test result is accurate;
(5) the method is suitable for measuring the soft shell battery core.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic external front view of an apparatus for measuring a change in cell volume according to embodiments 1 to 2 of the present invention;
fig. 2 is a schematic front view of an internal structure of an apparatus for measuring a cell volume change according to embodiment 1 of the present invention;
fig. 3 is a schematic side view of an internal structure of an apparatus for measuring a change in cell volume according to embodiments 3 to 4 of the present invention;
FIG. 4 is a schematic view of the connection of the flexible connecting section to the sensor holder and the measuring holder according to example 4 of the present invention;
fig. 5 is another schematic connection diagram of the flexible connecting section and the sensor holder and the measuring holder provided in embodiment 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The instrument and method for measuring the volume change of the battery cell are comprehensively described by the embodiment of the invention.
Example 1
As shown in fig. 1-2, the present embodiment provides an instrument for measuring a volume change of an electrical core, which includes a housing 1, a high-precision mechanical sensing system, and a measuring end.
The housing 1 can be made of a metal material, and a relatively closed accommodating space is formed to accommodate the high-precision mechanical sensing system and the measuring end, so that the high-precision mechanical sensing system and the measuring end are ensured to be in a relatively stable working environment.
In the embodiment, the high-precision mechanical sensing system comprises a high-precision weight sensor 2 and a sensor bracket 3, wherein the high-precision weight sensor 2 is fixedly installed in the shell 1; the sensor support 3 is mounted on the high-precision weight sensor 2, and both ends of the sensor support exceed the high-precision weight sensor 2.
Specifically, in the present embodiment, the high-precision weight sensor 2 may be an E10K single-point weighing sensor, the sensor holder 3 is in a straight line shape and is placed on the measuring position of the high-precision weight sensor 2, and two ends of the sensor holder extend outwards along the high-precision weight sensor 2 for a section, so as to facilitate the suspension connection of the force application device at two ends of the sensor holder 3. Of course, it should be noted that in other embodiments of the present invention, other types and models of the high-precision weight sensor 2 may be adopted, and these solutions are all within the protection scope of the present invention.
In this embodiment, the measuring end includes a measuring bracket 4, and the measuring bracket 4 is connected to the sensor bracket 3 and located below the sensor bracket 3. The shell 1 is provided with a holding cavity 14 for placing the cell sample, and the measuring support 4 is partially positioned in the holding cavity 14 so as to be connected with the cell sample.
Specifically, as shown in fig. 2, in a preferred embodiment of the present invention, the measuring end may further include a fixture (not shown) for fixing the cell sample, and a container (not shown) for containing the bath solution and the cell sample; the measuring bracket 4 comprises a first connecting arm 41, a second connecting arm 42 and a third connecting arm 43, one end of the first connecting arm 41 and one end of the second connecting arm 42 are respectively connected with two ends of the sensor bracket 3, and the third connecting arm 43 is transversely connected with the other end of the first connecting arm 41 and the other end of the second connecting arm 42; the clamp is connected to the third connecting arm 43; the container is placed in the accommodating cavity 14 and is positioned below the clamp.
The operation steps of the embodiment of the present invention and the measurement principle thereof are described below.
In the embodiment, when the volume change of the battery cell is measured, firstly, bath lotion is placed in the container, then, the battery cell to be measured is placed on the clamp and is immersed in the bath lotion, at the moment, the battery cell transmits the tensile force generated by gravity to the high-precision weight sensor 2 through the clamp, the measurement support 4 and the sensor support 3, and the high-precision weight sensor 2 records an initial tensile force value;
secondly, charging and discharging or formation operation or no operation is carried out on the battery cell, the change of the tension of the battery cell is monitored in real time through a high-precision mechanical sensing system, so that the buoyancy variable quantity of the battery cell can be obtained, the volume variable quantity of the battery cell is further calculated, and the accurate gas production volume and gas production rate of the battery cell in each stage can be obtained by combining the whole charging and discharging process;
the correlation calculation formula is as follows:
wherein, Δ V is the volume change of the battery cell, Δ F is the buoyancy change of the battery cell, ρ is the density of the bath lotion, and g is the gravity constant.
In this embodiment, the bath may be selected from silicone oil. The silicone oil has the advantages of electric insulation, weak volatility, high boiling point higher than 200 ℃, no toxicity and suitability for heating the battery core. Of course, other baths may be used, and the present invention is not particularly limited.
Through the mechanism, the instrument for measuring the volume change of the battery cell can record the volume change of the battery cell in the whole charging and discharging process in situ, so that the accurate gas production volume and gas production rate of the battery cell in each stage can be obtained, the measuring process is not easily influenced by the external environment, the operation is simple, the cost is low, the battery cell does not need to be moved in the measuring process, a large number of battery cells do not need to be consumed for participating in the test, the test result is accurate, and the instrument is suitable for measuring the soft-shell battery cell.
Example 2
As shown in fig. 1, in the present embodiment, preferably, on the basis of the above embodiment, the container is a double-layer beaker 8, a water inlet 9 and a water outlet 10 are provided on an outer wall of the double-layer beaker 8, and an interlayer 11 of the double-layer beaker 8 can be filled with water to heat the bath solution and the battery cell in a water bath.
Through water bath heating, can satisfy the temperature condition of electric core inflation test, it is safe and easily control the temperature.
Example 3
As shown in fig. 3, in addition to the above embodiments, in the present embodiment, an upper inner plate 12 and a lower inner plate 13 are preferably further provided in the housing 1; the high-precision weight sensor 2 is arranged on the upper inner plate 12, and the lower inner plate 13 and the bottom plate of the shell 1 form the accommodating cavity 14; the first connecting arm 41 and the second connecting arm 42 of the measuring bracket 4 pass through the upper inner plate 12 and the lower inner plate 13 without contact and extend into the accommodating cavity 14; the third connecting arm 43 is located in the accommodating cavity 14. The non-contact penetration can eliminate the interference of friction force on the test result.
Example 4
As shown in fig. 3, on the basis of the above embodiment 3, in this embodiment, a sensing system protection device is further included; the sensing system protection device is arranged between the upper inner plate 12 and the lower inner plate 13 and is connected with the first connecting arm 41 and the second connecting arm 42 so as to disconnect the conduction force of the measuring bracket 4 to the sensor bracket 3 by providing a supporting force; or to remove the supporting force to restore the conductive force of the measuring carriage 4 to the sensor carriage 3.
Because the high-precision weight sensor 2 is very precise and is easily damaged by the influence of external force in the processes of transporting, taking and placing samples and the like, the high-precision weight sensor 2 is disconnected from the external force when the measurement is not carried out so as to prevent the high-precision weight sensor 2 from being damaged, and a sensing system protection device is added.
Specifically, in one implementation manner, the sensing system protection device includes a cross bar 6 and a driving mechanism 7, two ends of the cross bar 6 are respectively connected to the first connecting arm 41 and the second connecting arm 42, a driving end of the driving mechanism 7 abuts against the lower side of the cross bar 6, and a fixed end of the driving mechanism 7 is fixed on the lower inner plate 13; flexible connecting sections 5 are arranged between the first connecting arm 41 and the sensor bracket 3 and between the second connecting arm 42 and the sensor bracket 3.
Wherein, actuating mechanism 7 contains motor and roof, and motor fixed connection is on inner panel 13 down, and roof is fixed connection downwards on the output shaft of motor, and the roof is upwards butt at 6 lower surfaces of horizontal pole. When the measurement is not started, the motor can drive the top plate to move upwards to support the cross rod 6 to move upwards, so that the flexible connecting section 5 is loosened, and the conduction force of the measurement bracket 4 to the sensor bracket 3 is disconnected; when the measurement is started, the motor drives the top plate to move downwards until the top plate is separated from the cross rod 6, so that the flexible connecting section 5 is straightened, and the conduction force of the measurement support 4 to the sensor support 3 is restored.
As shown in fig. 4, in this embodiment, the flexible connecting section 5 may be a rope made of a non-rigid material, and one end of the flexible connecting section 5 is connected to the sensor holder 3, and the other end is connected to the first connecting arm 41 or the second connecting arm 42. Of course, as shown in fig. 5, it is also possible to connect one end of the flexible connecting segment 5 to the sensor holder 3 and the other end to the cross bar 6 without contact through the upper inner plate 12, and these solutions are all within the protection scope of the present invention. In this embodiment, by adding the protection device of the sensing system, the high-precision weight sensor 2 can be in a state of no stress or small stress when not in use, so as to avoid the damage of the high-precision weight sensor 2 caused by sudden change of force in the processes of transporting, taking and placing samples and the like.
While the invention has been described with reference to a number of illustrative embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. An instrument for measuring the volume change of a battery cell is characterized by comprising a shell, a high-precision mechanical sensing system and a measuring end; wherein:
the high-precision mechanical sensing system comprises a high-precision weight sensor and a sensor bracket, and the high-precision weight sensor is fixedly arranged in the shell; the sensor bracket is arranged on the high-precision weight sensor, and two ends of the sensor bracket exceed the high-precision weight sensor;
the measuring end comprises a measuring bracket which is connected with the sensor bracket and is positioned below the sensor bracket;
the shell is provided with a holding cavity for placing the battery cell sample, and the measuring support part is located in the holding cavity to be connected with the battery cell sample.
2. The apparatus of claim 1, wherein the measuring end further comprises a fixture for fixing the cell sample and a container for containing the bath solution and the cell sample; the measuring bracket comprises a first connecting arm, a second connecting arm and a third connecting arm, one end of the first connecting arm and one end of the second connecting arm are respectively connected with two ends of the sensor bracket, and the third connecting arm is transversely connected with the other end of the first connecting arm and the other end of the second connecting arm; the clamp is connected to the third connecting arm; the container is arranged in the accommodating cavity and is positioned below the clamp.
3. The apparatus of claim 2, wherein the container is a double-layer beaker, a water inlet and a water outlet are arranged on the outer wall of the double-layer beaker, and the interlayer of the double-layer beaker is filled with water to heat the bath solution and the battery cell in a water bath.
4. The apparatus according to claim 2, wherein an upper inner plate and a lower inner plate are further disposed in the housing; the high-precision weight sensor is arranged on the upper inner plate, and the lower inner plate and the bottom plate of the shell form the accommodating cavity; the first connecting arm and the second connecting arm of the measuring support penetrate through the upper inner plate and the lower inner plate in a non-contact manner and extend into the accommodating cavity; the third connecting arm is located in the accommodating cavity.
5. The apparatus for measuring cell volume change according to claim 4, further comprising a sensing system protection device; the sensing system protection device is arranged between the upper inner plate and the lower inner plate and is connected with the first connecting arm and the second connecting arm so as to disconnect the conduction force of the measuring bracket to the sensor bracket by providing a supporting force; or removing the supporting force to restore the conduction force of the measuring bracket to the sensor bracket.
6. The apparatus according to claim 5, wherein the sensing system protection device includes a cross bar and a driving mechanism, two ends of the cross bar are respectively connected to the first connecting arm and the second connecting arm, a driving end of the driving mechanism abuts against a lower portion of the cross bar, and a fixed end of the driving mechanism is fixed to the lower inner plate; and flexible connecting sections are arranged between the first connecting arm and the sensor bracket and between the second connecting arm and the sensor bracket.
7. The apparatus of claim 6, wherein one end of the flexible connecting section is connected to the sensor holder, and the other end of the flexible connecting section is connected to the first connecting arm or the second connecting arm, or both the other ends of the flexible connecting section pass through the upper inner plate and are connected to the cross bar in a non-contact manner.
8. The apparatus of claim 6, wherein the flexible connecting section is a rope made of a non-rigid material; the driving mechanism can drive the cross rod to move upwards, so that the two ropes are bent, and the conduction force of the measuring bracket to the sensor bracket is disconnected; or the output end of the driving mechanism moves downwards until the output end of the driving mechanism is separated from the cross rod, so that the two ropes are straightened, and the conduction force of the measuring bracket to the sensor bracket is restored.
9. A method for measuring the volume change of a cell is applied to the instrument for measuring the volume change of the cell according to any one of claims 2 to 8, and is characterized by comprising the following steps:
placing bath liquid in a container, placing a battery cell to be measured on the clamp and immersing the battery cell into the bath liquid;
and carrying out charging and discharging operation on the battery cell, monitoring the buoyancy change of the battery cell in real time through the high-precision mechanical sensing system, and calculating the volume change of the battery cell according to the buoyancy change.
10. The method of measuring cell volume change of claim 9, wherein: the instrument for measuring the volume change of the battery cell is also provided with a sensing system protection device;
when the measurement is not started, the conduction force of the measurement bracket to the sensor bracket is cut off through the sensing system protection device;
when the measurement is started, the conduction force of the measurement bracket to the sensor bracket is recovered through the sensing system protection device.
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| CN202010139124.3A CN111256629B (en) | 2020-03-03 | 2020-03-03 | Instrument and method for measuring volume change of battery cell |
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| CN202010139124.3A CN111256629B (en) | 2020-03-03 | 2020-03-03 | Instrument and method for measuring volume change of battery cell |
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| CN111256629B (en) | 2022-03-01 |
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