Measuring device and measuring equipment

Abstract

The utility model provides a measuring device and measuring equipment, the measuring device comprises a first accommodating part and a second accommodating part, the first accommodating part comprises a first accommodating space, the first accommodating space is used for accommodating preset liquid, a battery is arranged in the first accommodating space and at least partially immersed in the preset liquid, and the second accommodating part comprises a second accommodating space. The second containing space is communicated with the first containing space and used for containing preset liquid, measuring scales are arranged on the outer wall of the second containing part in the longitudinal direction, and the radial size of the second containing part is smaller than that of the first containing part. The first containing part and the second containing part form a U-shaped communicating vessel, according to the communicating vessel principle, only the liquid level height variable quantity of the preset liquid in the second containing part needs to be read, the reading accuracy is improved, and the volume variable quantity generated when the battery works is calculated according to the height variable quantity, the bottom area of the first containing part and the bottom area of the second containing part. And the calculation accuracy and the measurement result of the volume variation of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a measuring device and measuring equipment. Background Art

[0002] Lithium-ion batteries are widely used in various electronic products due to their excellent cycle performance, rate performance, small size, light weight, and high reliability. With the gradual development of the market, all sectors of society are paying more and more attention to the safety of lithium-ion batteries.

[0003] For soft-pack batteries using lithium metal as the negative electrode material, the lithium metal material itself is easy to expand with the charge and discharge state. At the same time, the aluminum-plastic film of the soft-pack battery core cannot effectively restrict the lithium metal negative electrode that is easy to expand. Such expansion will bring certain safety hazards to lithium-ion battery products. Therefore, quantifying the volume expansion of lithium metal negative electrode soft-pack batteries throughout their life cycle is a task that needs to be verified during the research and development stage of related products. However, in the related technology, the battery volume measurement device has a relatively cumbersome procedure for measuring the volume of the battery during charge and discharge, and the measurement results are inaccurate. Utility Model Content

[0004] The purpose of the present application is to provide a measuring device and a measuring equipment to solve the technical problem that the volume measurement steps of the battery during charging and discharging of the battery in the related art are complicated and the measurement results are inaccurate.

[0005] In a first aspect, the present application provides a measuring device for measuring the volume of a battery, the measuring device comprising:

[0006] A first receiving member comprises a first receiving space, wherein the first receiving space is used to receive a preset liquid, and the battery is disposed in the first receiving space and at least partially immersed in the preset liquid; and

[0007] The second receiving piece includes a second receiving space, which is connected to the first receiving space and is used to receive the preset liquid. The outer wall of the second receiving piece is longitudinally provided with a measuring scale, and the radial dimension of the second receiving piece is smaller than the radial dimension of the first receiving piece.

[0008] In the measuring device provided by the present application, the first receiving member includes a first receiving space, the first receiving space is used to receive a preset liquid, the battery is arranged in the first receiving space and at least partially immersed in the preset liquid, the second receiving member includes a second receiving space, the second receiving space is connected to the first receiving space and is used to receive the preset liquid, the outer wall of the second receiving member is provided with a measuring scale in the longitudinal direction, and the radial dimension of the second receiving member is smaller than the radial dimension of the first receiving member. The first receiving member and the second receiving member form a U-shaped communicating vessel, the volume of the battery changes during the charging and discharging process so that the liquid level of the preset liquid in the first receiving member will also change accordingly, according to the communicating vessel principle, the liquid level of the preset liquid in the second receiving member will also change synchronously, the height change of the liquid level of the preset liquid in the second receiving member can be read, and the volume change of the battery during operation can be calculated based on the height change, the bottom area of ​​the first receiving member, and the bottom area of ​​the second receiving member. The volume of the second receiving member is relatively small, which is conducive to observing the slight change in the height of the liquid level of the preset liquid in the second receiving member, and improving the calculation accuracy and measurement results of the battery volume change. Furthermore, the volume change of the battery can be calculated by only reading the change in the liquid level of the preset liquid in the second receiving member, which is beneficial to simplifying the measurement steps of the measuring device.

[0009] Among them, the side wall of the first receiving piece includes a first through hole connected to the first receiving space, the side wall of the second receiving piece includes a second through hole connected to the second receiving space, and the second through hole and the first through hole are arranged correspondingly; the measuring device also includes a connecting part, and the pipeline of the connecting part connects the first through hole and the second through hole respectively, and connects the first receiving space and the second receiving space.

[0010] Wherein, a ratio α of a bottom area of ​​the first receiving piece to a bottom area of ​​the second receiving piece satisfies: 10≤α≤50.

[0011] Wherein, a ratio β of the radial dimension of the first receiving member to the width dimension of the battery satisfies: 1.1≤β≤3.

[0012] The structure of the first receiving piece includes a hollow column structure, and the structure of the second receiving piece includes a hollow column structure.

[0013] In which, the measuring device also includes a lifting assembly, which is spaced apart relative to the first receiving piece, the lifting assembly is connected to the battery, and at least a portion of the lifting assembly can be used to move along the axial direction of the first receiving piece and drive the battery to move along the axial direction of the first receiving piece so that the battery is immersed in the preset liquid or exposed to the preset liquid.

[0014] The lifting component includes a connected fixing part and a lifting part, wherein the fixing part is fixed relative to the first receiving part, one end of the lifting part is connected to the battery, and the other end is connected to the fixing part and can move relative to the lifting part to drive the battery to move.

[0015] Wherein, the measuring device also includes a clamping assembly, which is fixedly connected to the lifting member, and the clamping assembly includes a clamping hole and a clamping member, the pole ear of the battery is arranged in the clamping hole, and the clamping member is used to abut the pole ear of the battery and fix the pole ear of the battery in the clamping hole to fix the battery on the clamping assembly.

[0016] Wherein, the measuring device further comprises a base, and the first receiving member and the second receiving member are both arranged on the base.

[0017] In a second aspect, the present application provides a measuring device, which includes a preset liquid, an electrical performance testing device and the measuring device, wherein the preset liquid is disposed in the measuring device, and the electrical performance testing device is electrically connected to the battery and is used to charge and discharge the battery.

[0018] In the measuring device provided by the present application, the first receiving piece of the measuring device includes a first receiving space, the first receiving space is used to receive a preset liquid, the battery is arranged in the first receiving space and at least partially immersed in the preset liquid, the second receiving piece includes a second receiving space, the second receiving space is connected to the first receiving space and is used to receive the preset liquid, the outer wall of the second receiving piece is provided with a measuring scale in the longitudinal direction, and the radial dimension of the second receiving piece is smaller than the radial dimension of the first receiving piece. The first receiving piece and the second receiving piece form a U-shaped communicating vessel, the volume of the battery changes during the charging and discharging process so that the liquid level of the preset liquid in the first receiving piece will also change accordingly, according to the communicating vessel principle, the liquid level of the preset liquid in the second receiving piece will also change synchronously, the height change of the liquid level of the preset liquid in the second receiving piece can be read, and the volume change of the battery during operation can be calculated according to the height change, the bottom area of ​​the first receiving piece, and the bottom area of ​​the second receiving piece. The volume of the second receiving piece is small, which is conducive to observing the slight change of the height of the liquid level of the preset liquid in the second receiving piece, and improving the calculation accuracy and measurement results of the battery volume change. Furthermore, the volume change of the battery can be calculated by only reading the change in the liquid level of the preset liquid in the second receiving member, which is helpful to simplify the measurement steps of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of a measuring device provided in an embodiment of the present application. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of a measuring device provided in an embodiment of the present application. Figure 2 ;

[0022] Figure 3 It is a structural schematic diagram of a measuring device including a lifting assembly provided in an embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of a clamping assembly provided in an embodiment of the present application. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the structure of a clamping assembly provided in an embodiment of the present application. Figure 2 ;

[0025] Figure 6 It is a structural schematic diagram of a measuring device provided in an embodiment of the present application.

[0026] Description of labels:

[0027] Measuring equipment 1000, measuring device 100, first receiving piece 10, first through hole 11, second receiving piece 20, second through hole 21, battery 30, connecting part 40, base 50, lifting assembly 60, fixing piece 61, lifting piece 62, clamping assembly 70, clamping hole 71, clamping piece 72, electrical performance testing device 200. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In this specification, for the sake of convenience, the words and phrases indicating the orientation or positional relationship such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are used to illustrate the positional relationship of the constituent elements with reference to the drawings. This is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the orientation of the constituent elements being described. Therefore, it is not limited to the words and phrases described in the specification, and can be appropriately replaced according to the circumstances.

[0031] In this specification, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the meanings of the above terms in this disclosure can be understood according to the circumstances.

[0032] Lithium-ion batteries are widely used in various electronic products due to their excellent cycle performance, rate performance, small size, light weight, and high reliability. With the gradual development of the market, all sectors of society are paying more and more attention to the safety of lithium-ion batteries.

[0033] For soft-pack batteries using lithium metal as the negative electrode material, the lithium metal material itself is easy to expand with the charge and discharge state. At the same time, the aluminum-plastic film of the soft-pack battery core cannot effectively restrict the lithium metal negative electrode that is easy to expand. Such expansion will bring certain safety hazards to lithium-ion battery products. Therefore, quantifying the volume expansion of lithium metal negative electrode soft-pack batteries throughout their life cycle is a task that needs to be verified during the research and development stage of related products.

[0034] There is still a lack of testing methods for the volume expansion of lithium metal soft-pack batteries during the entire charging and discharging process. Most of them use a single test method of the drainage method, replacing the volume of the battery with the volume of the discharged water; or use a pressure fixture to test the change in the gap between the fixtures to estimate the change in the battery volume. Testing the volume of the battery using the drainage method or the fixture gap method has the following disadvantages: First, when observing the rise in the water level, it is difficult to observe and accurately read the tiny rise; second, when reading, it is necessary to wait for the water surface to be completely still before reading, and for containers with larger volumes and larger bottom areas, it may take a long time to wait; third, the volume of the battery cannot be tested continuously, and the data before and after the test needs to be calculated. Fourth, the traditional rigid fixture, after the large surface of the battery expands first, the large surface area in the middle will be interfered by a greater extrusion force, while the extrusion force on the four sides will become smaller. At this time, the pressure from the outside world on each part of the battery is no longer equal, interfering with the test results.

[0035] In summary, in the related art, the steps for measuring the volume of a battery during charging and discharging by a battery volume measuring device are complicated and the measurement results are inaccurate.

[0036] The purpose of the present application is to provide a measuring device 100 to solve the technical problem that the volume measurement steps of the battery during charging and discharging in the battery volume measuring device in the related art are complicated and the measurement results are inaccurate.

[0037] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a measuring device provided in an embodiment of the present application. Figure 1 . The present application provides a measuring device 100, which is used to measure the volume of a battery 30 during the charging and discharging process. The measuring device 100 includes a first receiving piece 10 and a second receiving piece 20. The first receiving piece 10 includes a first receiving space, and the first receiving space is used to receive the preset liquid. The battery 30 is arranged in the first receiving space and is at least partially immersed in the preset liquid. The second receiving piece 20 includes a second receiving space, and the second receiving space is connected to the first receiving space and is used to receive the preset liquid. The outer wall of the second receiving piece 20 is provided with a measuring scale in the longitudinal direction, and the radial dimension of the second receiving piece 20 is smaller than the radial dimension of the first receiving piece 10.

[0038] The first receiving piece 10 includes a first receiving space. Specifically, in this embodiment, the structure of the first receiving piece 10 includes a hollow column structure, and the first receiving space of the first receiving piece 10 is a hollow part. Optionally, in this embodiment, the structure of the first receiving piece 10 is a hollow cylindrical structure. In other embodiments, the structure of the first receiving piece 10 may also include other column structures such as a hollow square column and a hollow prism, which is not limited in this application.

[0039] The first receiving space of the first receiving member 10 is connected to the external environment. In other words, the top of the first receiving member 10 is a non-sealed top. The top of the first receiving member 10 is an opening, so that the battery 30 can enter from the top of the first receiving member 10 and be immersed in the preset liquid in the first receiving space.

[0040] The second receiving piece 20 includes a second receiving space. Specifically, in this embodiment, the structure of the second receiving piece 20 includes a hollow column structure, and the second receiving space of the second receiving piece 20 is a hollow portion. Optionally, in this embodiment, the structure of the second receiving piece 20 is a hollow cylindrical structure. In other embodiments, the structure of the second receiving piece 20 may also include other column structures such as a hollow square column and a hollow prism, which is not limited in this application.

[0041] The first receiving space of the first receiving member 10 is connected to the second receiving space of the second receiving member 20. In other words, the first receiving member 10 and the second receiving member 20 at least partially form a U-shaped tube. In other words, the first receiving member 10 and the second receiving member 20 form a U-shaped communicating vessel. According to the principle of fluid statics, when the preset liquid in the measuring device 100 is in a stable state, the liquid level of the preset liquid in the first receiving member 10 is equal to the liquid level of the preset liquid in the second receiving member 20.

[0042] Specifically, when the battery 30 is immersed in the preset liquid in the first receiving member 10, the battery 30 is electrically connected through the electrical performance testing device 200, and the battery 30 is charged and discharged. The specific charging and discharging operations are described in detail below, and the present application does not limit this. At this time, because the battery 30 is immersed in the preset liquid in the first receiving member 10, if the volume of the battery 30 changes during the charging and discharging process, the liquid level of the preset liquid in the first receiving member 10 will also change accordingly. According to the principle of communicating vessels, when the liquid level of the preset liquid in the first receiving member 10 changes, the liquid level of the preset liquid in the second receiving member 20 will also change synchronously, and the side wall of the second receiving member 20 is longitudinally provided with a measuring scale. When the liquid level of the preset liquid in the second receiving member 20 changes, the height change h of the preset liquid level can be read, and the volume change V of the battery 30 during operation is calculated according to the height change h, the bottom area S1 of the first receiving member 10, and the bottom area S2 of the second receiving member 20. Specifically, in this embodiment, the first receiving member 10 and the second receiving member 20 are in the shape of a hollow cylinder, and the change in volume V of the battery 30 is (S1+S2)*h. In other embodiments, if the first receiving member 10 and the second receiving member 20 are in the shape of other types of hollow cylindrical structures, the change in volume V of the battery 30 can also be calculated by other corresponding structural volume formulas, and this application does not limit this.

[0043] It should be noted that the bottom area S1 of the first receiving member 10 is the bottom area measured without the thickness of the side wall of the first receiving member 10. In other words, the bottom area S1 of the first receiving member 10 is the radial area of ​​the first receiving space. Similarly, the bottom area S2 of the second receiving member 20 is the bottom area measured without the thickness of the side wall of the second receiving member 20. In other words, the bottom area S2 of the second receiving member 20 is the radial area of ​​the second receiving space. This can avoid errors in calculating the volume change of the battery 30 and improve the measurement accuracy of the volume change of the battery 30.

[0044] It should be further explained that the volume change of the battery 30 during operation includes, but is not limited to, the expansion or contraction of the battery 30. Specifically, for example, when the battery 30 is charged, the battery 30 will expand to a certain extent, and the volume of the battery 30 will increase, thereby causing the liquid level of the preset liquid in the first receiving part 10 to rise. According to the principle of communicating vessels, the liquid level of the preset liquid in the second receiving part 20 will rise synchronously, and the rising height of the liquid level of the preset liquid in the second receiving part 20 will be consistent with the rising height of the liquid level of the preset liquid in the first receiving part 10. Similarly, when the battery 30 is discharged, the battery 30 will shrink to a certain extent, and the volume of the battery 30 will shrink, thereby causing the liquid level of the preset liquid in the first receiving part 10 to drop. According to the principle of communicating vessels, the liquid level of the preset liquid in the second receiving part 20 will drop synchronously, and the falling height of the liquid level of the preset liquid in the second receiving part 20 will be consistent with the falling height of the liquid level of the preset liquid in the first receiving part 10. Furthermore, after the battery 30 is charged and discharged multiple times, the expansion volume or contraction volume of the battery 30 may be calculated by observing the change in the liquid level in the second receiving member 20 , and the present application does not impose any limitation on this.

[0045] The outer wall of the second receiving piece 20 is provided with a measuring scale in the longitudinal direction. In the present embodiment, the minimum reading unit of the measuring scale is 0.1mm-1mm. Optionally, the minimum reading unit of the measuring scale may be 0.1mm, or 0.2mm, or 0.3mm, or 0.4mm, or 0.5mm, or 0.6mm, or 0.7mm, or 0.8mm, or 0.9mm, or 1.0mm, or other values ​​within 0.1mm-1mm. The minimum reading unit range of the measuring scale may also be other ranges, which shall not be construed as a limitation to the present application.

[0046] The radial dimension of the second receiving member 20 is smaller than the radial dimension of the first receiving member 10. In other words, the volume of the second receiving member 20 is smaller than the volume of the first receiving member 10. The smaller volume of the second receiving member 20 makes it easier to observe the liquid level when the liquid level of the preset liquid in the second receiving member 20 changes, which is conducive to observing the slight change in the liquid level of the preset liquid in the second receiving member 20 and simultaneously reflects the slight change in the liquid level of the preset liquid in the first receiving member 10.

[0047] In this embodiment, the first receiving member 10 and the second receiving member 20 can be an integrated structure. In other words, the first receiving member 10 and the second receiving member 20 can be made in one process. For the convenience of description, the present application names them separately, which should not be understood as a limitation to the present application. In other embodiments, the first receiving member 10 and the second receiving member 20 can also be a split structure, which is not limited in the present application.

[0048] In the measuring device 100 provided in the present application, the first receiving piece 10 includes a first receiving space, the first receiving space is used to receive the preset liquid, the battery 30 is arranged in the first receiving space and is at least partially immersed in the preset liquid, the second receiving piece 20 includes a second receiving space, the second receiving space is connected to the first receiving space and is used to receive the preset liquid, the outer wall of the second receiving piece 20 is provided with a measuring scale along the longitudinal direction, and the radial dimension of the second receiving piece 20 is smaller than the radial dimension of the first receiving piece 10. The first receiving member 10 and the second receiving member 20 form a U-shaped communicating vessel. The volume of the battery 30 changes during the charging and discharging process, so that the liquid level of the preset liquid in the first receiving member 10 will also change accordingly. According to the communicating vessel principle, the liquid level of the preset liquid in the second receiving member 20 will also change synchronously. The height change of the preset liquid level in the second receiving member 20 can be read, and the volume change of the battery 30 during operation can be calculated based on the height change, the bottom area of ​​the first receiving member 10, and the bottom area of ​​the second receiving member 20. The volume of the second receiving member 20 is small, which is conducive to observing the slight change in the height of the preset liquid level in the second receiving member 20, and improving the calculation accuracy and measurement results of the volume change of the battery 30. In addition, the volume change of the battery 30 can be calculated by only reading the height change of the preset liquid level in the second receiving member 20, which is conducive to simplifying the measurement steps of the measuring device 100.

[0049] Furthermore, if the liquid level of the preset liquid in the first receiving component 10 is read, the preset liquid is likely to form tension with the battery cell, thereby affecting the measurement result. The measuring device 100 of the present application can directly read the liquid level of the preset liquid in the second receiving component 20, thereby improving the accuracy of the measurement result.

[0050] Optionally, in this embodiment, the material of the preset liquid includes but is not limited to fluorinated ether-based electronic coolant or deionized water (pure water), which has a high dielectric constant and excellent thermal conductivity, and has stable physical and chemical properties at room temperature and is not easy to volatilize, which can improve the safety and reliability of the measuring device 100 when performing electrical performance testing on the battery 30. In other embodiments, the preset liquid can also be other liquid materials with a high dielectric constant and excellent thermal conductivity, which is not limited in this application.

[0051] It should be noted that, in this embodiment, the measuring device 100 is used to measure the volume change of the battery 30 when it is in a working state. In other embodiments, the measuring device 100 can also be used to directly measure the volume of the battery 30, or to measure the volume of other structural parts, which should not be understood as a limitation to the present application.

[0052] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a measuring device provided in an embodiment of the present application. Figure 2 In one embodiment, the side wall of the first receiving member 10 includes a first through hole 11 connected to the first receiving space, and the side wall of the second receiving member 20 includes a second through hole 21 connected to the second receiving space, and the second through hole 21 and the first through hole 11 are arranged correspondingly. The measuring device 100 also includes a connecting portion 40, and the pipeline of the connecting portion 40 connects the first through hole 11 and the second through hole 21 respectively, and connects the first receiving space and the second receiving space.

[0053] In this embodiment, the first through hole 11 is disposed at the bottom of the side wall of the first receiving member 10 , and the second through hole 21 is disposed at the bottom of the side wall of the second receiving member 20 , so that the first receiving member 10 and the second receiving member 20 relatively form a U-shaped communicating vessel structure.

[0054] It should be noted that, in the present embodiment, the measuring device 100 further includes a connecting portion 40, and the first receiving member 10, the second receiving member 20, and the connecting portion 40 form a U-shaped connecting vessel. In other embodiments, the first receiving member 10 may include a connecting pipe, and the connecting pipe is connected to the second through hole 21 of the second receiving member 20, or the second receiving member 20 may include a connecting pipe, and the connecting pipe is connected to the first through hole 11 of the first receiving member 10. All of the above belong to the embodiments of the present application, and the present application does not limit this. Among them, the present application does not limit the transverse length of the connecting portion 40. Optionally, the transverse length of the connecting portion 40 may be less than 5 cm. For example, the transverse length of the connecting portion 40 may be 1 cm, or 2 cm, or 3 cm, or 4 cm, or 5 cm, or other values, and the present application does not limit this.

[0055] In one embodiment, a ratio α of a bottom area of ​​the first receiving member 10 to a bottom area of ​​the second receiving member 20 satisfies: 10≤α≤50.

[0056] Optionally, the ratio α of the bottom area of ​​the first receiving member 10 to the bottom area of ​​the second receiving member 20 can be 10, or 12, or 15, or 18, or 20, or 22, or 24, or 26, or 27, or 29, or 30, or 31, or 33, or 38, or 40, or 41, or 43, or 44, or 46, or 48, or 49, or 50, or other values ​​within the range of 10-50, and the present application does not impose any limitation thereto.

[0057] In one embodiment, a ratio β of a radial dimension of the first receiving member 10 to a width dimension of the battery 30 satisfies: 1.1≤β≤3.

[0058] Optionally, the ratio β of the radial dimension of the first receiving member 10 and the width dimension of the battery 30 can be 1.1, or 1.2, or 1.3, or 1.4, or 1.5, or 1.6, or 1.7, or 1.8, or 1.9, or 2.0, or 2.1, or 2.2, or 2.3, or 2.4, or 2.5, or 2.6, or 2.7, or 2.8, or 2.9, or 3, or other values ​​within the range of 1.1-3, and the present application does not impose any limitation on this.

[0059] In one embodiment, the height of the first receiving piece 10 is 30cm-50cm. Optionally, the height of the first receiving piece 10 can be 30cm, or 32cm, or 34cm, or 35cm, or 37cm, or 39cm, or 40cm, or 41cm, or 43cm, or 45cm, or 48cm, or 50cm, or other values ​​within the range of 30cm-50cm. Similarly, the height of the second receiving piece 20 is 30cm-50cm. The height of the second receiving piece 20 can be 30cm, or 32cm, or 34cm, or 35cm, or 37cm, or 39cm, or 40cm, or 41cm, or 43cm, or 45cm, or 48cm, or 50cm, or other values ​​within the range of 30cm-50cm. In other embodiments, the heights of the first receiving member 10 and the second receiving member 20 may also be adjusted according to the specifications of the battery 30. For example, the heights of the first receiving member 10 and the second receiving member 20 may also be 50 cm-100 cm or other ranges. The heights of the first receiving member 10 and the second receiving member 20 may also be different, and the present application does not impose any restrictions on this.

[0060] Please refer to Figure 1 to Figure 2 In one embodiment, the measuring device 100 further includes a base 50 , and the first receiving member 10 and the second receiving member 20 are both disposed on the base 50 .

[0061] The base 50 is a rigid material. Optionally, the material of the base 50 includes but is not limited to metal, high-performance plastic and other rigid materials, which is not limited in the present application. The base 50 is arranged on a horizontal placement surface, and the base 50 is kept parallel to the horizontal placement surface to improve the stability of the measuring device 100, thereby improving the accuracy of reading the preset liquid level height. In one embodiment, the base 50 may include a first base and a second base, and the first receiving member 10 is arranged on the first base, and the second receiving member 20 is arranged on the second base, and the first base and the second base are kept in a relatively horizontal state to improve the stability of the measuring device 100.

[0062] Please refer to Figure 3 , Figure 31 is a schematic diagram of a structure of a measuring device including a lifting assembly provided in an embodiment of the present application. In one embodiment, the measuring device 100 further includes a lifting assembly 60, the lifting assembly 60 is spaced relative to the first receiving member 10, the lifting assembly 60 is connected to the battery 30, and at least a portion of the lifting assembly 60 can be used to move along the axial direction of the first receiving member 10, and drive the battery 30 to move along the axial direction of the first receiving member 10, so that the battery 30 is immersed in the preset liquid or exposed to the preset liquid.

[0063] Furthermore, the lifting component 60 includes a connected fixing member 61 and a lifting member 62, wherein the fixing member 61 is fixed relative to the first receiving member 10, one end of the lifting member 62 is connected to the battery 30, and the other end is connected to the fixing member 61 and can move relative to the lifting member 62 to drive the battery 30 to move.

[0064] Specifically, the fixing member 61 includes an extension portion and a bending portion, one end of the extension portion is fixed to the base 50, and the other end extends in a vertical direction, the bending portion is connected to the other end of the extension portion, and the bending portion is arranged above the first receiving member 10 to facilitate connection with the lifting member 62.

[0065] The lifting member 62 can be used to drive the battery 30 to move in the preset liquid and make the battery 30 hover at any height, so as to facilitate the measurement of the volume change of the battery 30. It should be noted that, in this embodiment, the lifting assembly 60 also includes an adjustment member, and the adjustment member can be used to fix the lifting member 62. In this embodiment, the lifting assembly 60 needs to be adjusted manually to adjust the height of the battery 30. In other embodiments, the lifting assembly 60 can also be a fully automatic structural member, and the height of the battery 30 is adjusted by a computer, and this application does not limit this.

[0066] Please refer to Figures 3 to 5 , Figure 4 This is a schematic diagram of the structure of a clamping assembly provided in an embodiment of the present application. Figure 1 , Figure 5 This is a schematic diagram of the structure of a clamping assembly provided in an embodiment of the present application. Figure 2 In one embodiment, the measuring device 100 further includes a clamping assembly 70, the clamping assembly 70 is fixedly connected to the lifting member 62, the clamping assembly 70 includes a clamping hole 71 and a clamping member 72, the pole ear of the battery 30 is arranged in the clamping hole 71, and the clamping member 72 is used to abut the pole ear of the battery 30 and fix the pole ear of the battery 30 in the clamping hole 71, so as to fix the battery 30 on the clamping assembly 70. Figure 4is a schematic diagram of a structure in which the clamping member 72 does not move. Figure 5 It is a schematic diagram of the structure after the clamping member 72 moves to a certain position.

[0067] Specifically, the tab of the battery 30 is first passed through the clamping hole 71, and then the clamping member 72 is moved to abut against the tab, and the tab is abutted against the hole wall of the clamping hole 71 and clamped and fixed. It should be noted that the clamping member 72 includes but is not limited to structural members such as bolts.

[0068] Optionally, in this embodiment, the number of the clamping holes 71 and the clamping members 72 is 2, and they are respectively used to fix the positive pole tab and the negative pole tab of the battery 30. In other embodiments, the number of the clamping holes 71 and the clamping members 72 may also be 1, 3, or other numbers, and the present application does not impose any limitation on this.

[0069] Please refer to Figure 6 The present application also provides a measuring device 1000, which includes a preset liquid, an electrical performance testing device 200 and the measuring device 100, wherein the preset liquid is disposed in the measuring device 100, and the electrical performance testing device 200 is electrically connected to the battery 30 and is used to charge and discharge the battery 30.

[0070] The electrical performance testing device 200 is electrically connected to the battery 30 and is used to charge and discharge the battery 30. The measuring device 100 is used to measure the volume change of the battery 30 in the working state. It should be noted that the user can observe the volume change of the battery 30 according to multiple parameters through the measuring device 100, and the multiple parameters include but are not limited to time, SOC, throughput, etc., wherein the SOC is the discharge and charge state of the battery 30 reflected by the electrical performance testing device 200, and the throughput is the total charge and discharge energy of the battery 30.

[0071] In the measuring device 1000 provided in the present application, the first receiving piece 10 of the measuring device 100 includes a first receiving space, the first receiving space is used to receive the preset liquid, the battery 30 is arranged in the first receiving space and is at least partially immersed in the preset liquid, the second receiving piece 20 includes a second receiving space, the second receiving space is connected to the first receiving space and is used to receive the preset liquid, the outer wall of the second receiving piece 20 is provided with a measuring scale along the longitudinal direction, and the radial dimension of the second receiving piece 20 is smaller than the radial dimension of the first receiving piece 10. The first receiving member 10 and the second receiving member 20 form a U-shaped communicating vessel. The volume of the battery 30 changes during the charging and discharging process, so that the liquid level of the preset liquid in the first receiving member 10 will also change accordingly. According to the communicating vessel principle, the liquid level of the preset liquid in the second receiving member 20 will also change synchronously. The height change of the preset liquid level in the second receiving member 20 can be read, and the volume change of the battery 30 during operation can be calculated based on the height change, the bottom area of ​​the first receiving member 10, and the bottom area of ​​the second receiving member 20. The volume of the second receiving member 20 is small, which is conducive to observing the slight change in the height of the preset liquid level in the second receiving member 20, and improving the calculation accuracy and measurement results of the volume change of the battery 30. In addition, the volume change of the battery 30 can be calculated by only reading the height change of the preset liquid level in the second receiving member 20, which is conducive to simplifying the measurement steps of the measuring device 1000.

[0072] Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, provided that there is no contradiction between them.

[0073] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A measuring device, characterized in that: Used to measure the volume of a battery, the measuring device comprises: A first receiving member comprises a first receiving space, wherein the first receiving space is used to receive a preset liquid, and the battery is disposed in the first receiving space and at least partially immersed in the preset liquid; and The second receiving piece includes a second receiving space, which is connected to the first receiving space and is used to receive the preset liquid. The outer wall of the second receiving piece is longitudinally provided with a measuring scale, and the radial dimension of the second receiving piece is smaller than the radial dimension of the first receiving piece.

2. The measuring device according to claim 1, characterized in that The side wall of the first receiving member includes a first through hole connected to the first receiving space, and the side wall of the second receiving member includes a second through hole connected to the second receiving space, and the second through hole and the first through hole are arranged correspondingly; The measuring device further includes a connecting portion, wherein a pipe of the connecting portion connects the first through hole and the second through hole respectively, and connects the first receiving space and the second receiving space.

3. The measuring device according to claim 1, characterized in that A ratio α of a bottom area of ​​the first receiving piece to a bottom area of ​​the second receiving piece satisfies: 10≤α≤50.

4. The measuring device according to claim 1, characterized in that A ratio β of a radial dimension of the first receiving member to a width dimension of the battery satisfies: 1.1≤β≤3.

5. The measuring device according to claim 1, characterized in that The structure of the first receiving piece includes a hollow cylindrical structure, and the structure of the second receiving piece includes a hollow cylindrical structure.

6. The measuring device according to claim 1, characterized in that The measuring device also includes a lifting component, which is spaced apart from the first receiving piece, the lifting component is connected to the battery, and at least a portion of the lifting component can be used to move along the axial direction of the first receiving piece and drive the battery to move along the axial direction of the first receiving piece so that the battery is immersed in the preset liquid or exposed to the preset liquid.

7. The measuring device according to claim 6, characterized in that The lifting component includes a connected fixing member and a lifting member, wherein the fixing member is fixed relative to the first receiving member, one end of the lifting member is connected to the battery, and the other end is connected to the fixing member and can move relative to the lifting member to drive the battery to move.

8. The measuring device according to claim 7, characterized in that The measuring device also includes a clamping assembly, which is fixedly connected to the lifting member. The clamping assembly includes a clamping hole and a clamping member. The battery tab is arranged in the clamping hole. The clamping member is used to abut the battery tab and fix the battery tab in the clamping hole to fix the battery on the clamping assembly.

9. The measuring device according to any one of claims 1 to 7, characterized in that: The measuring device further comprises a base, and the first receiving member and the second receiving member are both arranged on the base.

10. A measuring device, characterized in that: The measuring device comprises a preset liquid, an electrical performance testing device and the measuring device according to any one of claims 1 to 9, wherein the preset liquid is arranged in the measuring device, and the electrical performance testing device is electrically connected to the battery and is used to charge and discharge the battery.

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