CN212134814U - Lithium battery isolation film surface resistance measuring device - Google Patents
Lithium battery isolation film surface resistance measuring device Download PDFInfo
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- CN212134814U CN212134814U CN202020167787.1U CN202020167787U CN212134814U CN 212134814 U CN212134814 U CN 212134814U CN 202020167787 U CN202020167787 U CN 202020167787U CN 212134814 U CN212134814 U CN 212134814U
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- electrode assembly
- resistance measuring
- surface resistance
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Abstract
The utility model discloses a lithium cell barrier film face resistance measuring device, it contains: the upper electrode assembly is provided with an upper electrode body and an insulating element wrapping the side wall of the lower end of the upper electrode body, and the bottom surface of the upper electrode body and the bottom surface of the insulating element form a coplanar; the top end of the lower electrode assembly is provided with a containing groove which can contain the upper electrode assembly, the electrolyte and the test isolating membrane; and a surface resistance measuring element electrically connected to the upper electrode assembly and the lower electrode assembly, wherein a load of the upper electrode assembly is between 20gf and 160 gf. The utility model discloses a lithium cell isolation membrane face resistance measuring device can simplify the operation procedure, shortens measuring time.
Description
Technical Field
The utility model relates to a lithium cell isolation membrane face resistance measuring device especially relates to a simple and convenient lithium cell isolation membrane face resistance measuring device of design.
Background
The lithium battery isolation film is a polymer film applied to a lithium battery, and is disposed between a positive electrode and a negative electrode to prevent a short circuit between the two electrodes due to physical contact. Meanwhile, a large number of micropores which are bent and run through are formed in the isolating membrane, lithium ions are allowed to pass through the micropores and migrate between the positive electrode and the negative electrode to form a battery internal conductive loop, and electrons pass through an external loop to form a current loop between the positive electrode and the negative electrode.
The quantity of lithium ions passing through the unit area of the isolation film in unit time is an important index for measuring the performance of the isolation film, and usually the ionic conductivity of the isolation film is represented by measuring the conductivity or the surface resistance of the isolation film, so as to evaluate the performance of the isolation film, wherein the measurement of the conductivity of the isolation film is easily affected by factors such as the distance between two electrodes and the roughness of the electrode surface, so that a large error exists, and more resources are required to be invested to improve the accuracy, so the industry often measures the surface resistance to evaluate the performance of the isolation film.
The prior art has proposed a surface resistance measuring device, which includes an insulating housing, an upper electrode plate and a lower electrode plate, wherein the insulating housing is provided with a liquid tank, the lower electrode plate is disposed at the bottom of the liquid tank and connected to an external electrochemical workstation via a bolt and a binding post, the upper electrode plate is covered by an insulating sleeve ring and an insulating cover plate and fixed with an insulating counterweight via the bolt, and the upper electrode plate is connected to the external electrochemical workstation via the bolt and the binding post. The electrode plate of the surface resistance measuring device is maintained in an insulating environment to avoid the interference of external air and dust impurities on the test result.
In addition, there is also proposed a surface resistance measuring apparatus in which an electrode is covered with an insulating material, a lower electrode of the apparatus is fixed to a base, and an upper electrode of the apparatus is connected to a transmission member, and the upper electrode is moved in a vertical direction by the transmission member and a predetermined pressure is applied to the lower electrode to perform measurement. The surface resistance measuring device has a complex structure and is complex to operate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a lithium cell barrier film face resistance measurement device to avoid the problem that the electrode took place to leak current, and can simplify the experiment operation, shorten the measuring time of face resistance.
According to an aspect of the utility model provides a lithium cell isolation membrane face resistance measurement device, it contains:
the upper electrode assembly is provided with an upper electrode body and an insulating element wrapping the side wall of the lower edge of the upper electrode body, and the bottom surface of the upper electrode body and the bottom surface of the insulating element form a coplanar;
the top end of the lower electrode assembly is provided with a containing groove which can contain the upper electrode assembly, the electrolyte and the test isolating membrane; and
a surface resistance measuring element electrically connected to the upper electrode assembly and the lower electrode assembly,
wherein the load of the upper electrode assembly is between 20gf to 160 gf.
As an optional technical solution, the electrode assembly further comprises a resin filled between the upper electrode body and the insulating element.
As an optional technical solution, the bottom surface of the upper electrode body and the bottom surface of the receiving groove of the lower electrode assembly are polished surfaces.
As an optional technical solution, the surface roughness of the bottom surface of the upper electrode body and the surface roughness of the bottom surface of the receiving groove of the lower electrode assembly are both less than 1 μm.
As an optional technical solution, the depth of the receiving groove is smaller than the height of the insulating element of the upper electrode assembly.
As an optional technical solution, the upper electrode assembly has a first jack, the lower electrode assembly has a second jack, and the surface resistance measuring element includes a first electrical plug and a second electrical plug respectively inserted into the first jack of the upper electrode assembly and the second jack of the lower electrode assembly, so that the upper electrode assembly and the lower electrode assembly are electrically connected to the surface resistance measuring element.
As an alternative solution, the isolation film is disposed between the upper electrode assembly and the lower electrode assembly.
As an optional technical solution, the material of the upper electrode body is stainless steel or aluminum alloy which is anodized, and the upper electrode body is a cylinder with a diameter between 20mm and 40 mm.
As an optional technical scheme, the bottom surface of the insulating element and the bottom surface of the upper electrode body form a coplanar surface with the diameter between 25mm and 50 mm.
As an optional technical solution, the receiving groove is a circular bottom surface with a diameter between 30mm to 55 mm.
To sum up, the utility model discloses an upper electrode subassembly coats upper electrode body lower edge lateral wall for insulating element, and can further fill the clearance with the resin between the two, can avoid the leakage current that foreign matter impurity card leads to between upper electrode body and insulating element by this. In addition, after the isolating film is flatly placed in the containing groove of the lower electrode assembly, the upper electrode assembly can be directly placed on the isolating film, and the isolating film is pressed down by utilizing the load of the upper electrode assembly so as to be flatly attached, so that the operation procedure is simple and convenient, and the measuring time can be greatly shortened.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery isolation film surface resistance measurement device according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of an upper electrode assembly according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a lower electrode assembly according to an embodiment of the present invention.
Detailed Description
The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of a preferred embodiment of the invention as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 shows a schematic structural diagram of a lithium battery separator surface resistance measuring device 10 according to an embodiment of the present invention, in which the lithium battery separator surface resistance measuring device 10 includes an upper electrode assembly 100, a lower electrode assembly 200, and a surface resistance measuring element 300 of a separator. The utility model discloses a lithium cell barrier film face resistance measuring device 10 puts barrier film (not shown in the drawing) and presses between two electrode subassemblies (be promptly go up electrode subassembly 100 and electrode subassembly 200 down), and the face resistance value of barrier film is surveyed through electric connection's face resistance measuring element 300, by this aassessment barrier film's performance. Each component/element of the device is described in further detail below.
Fig. 2 is a cross-sectional view of the upper electrode assembly 100 according to an embodiment of the present invention, which shows that the upper electrode assembly 100 has an upper electrode body 110 and an insulating element 120, wherein the upper electrode body 110 is made of anodized stainless steel or aluminum alloy and is a cylinder with a diameter between 20mm and 40mm, preferably 20mm to 30mm, the bottom surface 112 of the upper electrode body 110 is a polished surface with a smooth surface for facilitating the film to be flatly attached to the surface of the electrode when the isolation film is pressed, and the surface roughness (Rz) of the bottom surface 112 of the upper electrode body 110 is preferably less than 1 μm, more preferably less than 0.5 μm. The insulating element 120 is made of an electrically insulating material and covers the sidewall of the lower edge of the upper electrode body 110, and the bottom surface 122 of the insulating element 120 and the bottom surface 112 of the upper electrode body 110 form a coplanar surface with a diameter of 25mm to 50 mm. The insulating element 120 is disposed to prevent the exposed electrodes from easily causing the detection current to flow outside the predetermined circuit route and thus increase the test variation when the upper electrode assembly 100 is in contact with the lower electrode assembly 200. The height of the insulating element 120 is not particularly limited to avoid the flow of current beyond the test when the upper electrode assembly 100 is in contact with the lower electrode assembly 200. The material of the insulating element 120 may be a plastic material, such as polypropylene (PP), Polyethylene (PE), polyethylene terephthalate (PET), Acrylonitrile Butadiene Styrene (ABS), or an epoxy resin, preferably an epoxy resin.
In an embodiment of the present invention, the insulating element may further include a resin (not shown) filled between the upper electrode body 110 and the insulating element 120 to prevent foreign impurities from being stuck between the upper electrode body 110 and the insulating element 120 and reduce the leakage current.
In an embodiment of the present invention, the upper electrode assembly 100 needs a certain load, so that the load can make the surface of the isolation film to be tested smoothly adhere to the surface of the upper and lower electrodes and sufficiently discharge the bubbles of the isolation film when the resistance of the isolation film is measured. The load of the upper electrode assembly 100 may be in a range of 20gf to 160gf (where gf is a meaning of gram force, that is, a weight of a gram of the object), preferably 40gf to 80 gf. When the load of the upper electrode assembly 100 is too low, bubbles in the separator cannot be removed and the membrane surface cannot be smoothly attached, and when the load is too high, bubbles can be removed, but the membrane surface is crushed and damaged and the porous structure is closed.
Fig. 3 is a cross-sectional view of the lower electrode assembly 200 according to an embodiment of the present invention, and fig. 3 shows that the top end of the lower electrode assembly 200 has a receiving groove 210 for receiving the upper electrode assembly 100, an electrolyte (not shown) and a test isolation film (not shown). The design of the accommodating groove 210 can make the isolation film fully soaked in the electrolyte, thereby avoiding the influence on the measurement accuracy due to insufficient electrolyte. The lower electrode assembly 200 and the upper electrode body 100 are made of the same material. The receiving groove 210 has a circular bottom surface 212 with a diameter between 30mm and 55mm and a depth smaller than the height of the insulating member 120. The bottom surface 212 of the receiving groove 210 is a polished surface that is smoothed, and the surface roughness (Rz) thereof is preferably less than 1 μm, and more preferably less than 0.5 μm.
Referring to fig. 1 to 3, the upper electrode assembly 100 and the lower electrode assembly 200 may be connected to the surface resistance measuring device 300, for example, the upper electrode assembly 100 has a first insertion hole 114, the lower electrode assembly 200 has a second insertion hole 214, and the surface resistance measuring device 300 further includes a first electrical plug 310 and a second electrical plug 320 respectively inserted into the first insertion hole 114 and the second insertion hole 214, so that the upper electrode assembly 100 and the lower electrode assembly 200 are electrically connected to the surface resistance measuring device 300. The first electrical pins 310 and the second electrical pins 320 may be movable pins or fixed pins, preferably fixed pins, to avoid errors caused by contact resistance.
To sum up, the utility model discloses an upper electrode subassembly coats upper electrode body lower edge lateral wall for insulating element, and can further fill the clearance with the resin between the two, can avoid the leakage current that foreign matter impurity card leads to between upper electrode body and insulating element by this. In addition, after the isolating film is flatly placed in the containing groove of the lower electrode assembly, the upper electrode assembly can be directly placed on the isolating film, and the isolating film is pressed down by utilizing the load of the upper electrode assembly so as to be flatly attached, so that the operation procedure is simple and convenient, and the measuring time can be greatly shortened.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims appended hereto. The scope of the claims of the present invention should therefore be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is appropriate to the context of the description set forth above.
Claims (10)
1. A lithium battery isolation film surface resistance measuring device is characterized by comprising:
the upper electrode assembly is provided with an upper electrode body and an insulating element wrapping the side wall of the lower edge of the upper electrode body, and the bottom surface of the upper electrode body and the bottom surface of the insulating element form a coplanar;
the top end of the lower electrode assembly is provided with a containing groove which can contain the upper electrode assembly, the electrolyte and the test isolating membrane; and
a surface resistance measuring element electrically connected to the upper electrode assembly and the lower electrode assembly,
wherein the load of the upper electrode assembly is between 20gf to 160 gf.
2. The lithium battery separator surface resistance measuring device of claim 1, further comprising a resin filled between the upper electrode body and the insulating member.
3. The lithium battery separator surface resistance measuring device of claim 1, wherein the bottom surface of the upper electrode body and the bottom surface of the receiving groove of the lower electrode assembly are polished surfaces.
4. The lithium battery separator surface resistance measurement device of claim 1, wherein the surface roughness of the bottom surface of the upper electrode body and the surface roughness of the bottom surface of the receiving groove of the lower electrode assembly are both less than 1 μm.
5. The lithium battery separator surface resistance measuring device of claim 1, wherein the depth of the receiving groove is less than the height of the insulating element of the upper electrode assembly.
6. The lithium battery separator surface resistance measuring device of claim 1, wherein the upper electrode assembly has a first receptacle, the lower electrode assembly has a second receptacle, and the surface resistance measuring element comprises a first electrical plug and a second electrical plug for respectively inserting into the first receptacle of the upper electrode assembly and the second receptacle of the lower electrode assembly, such that the upper electrode assembly and the lower electrode assembly are electrically connected to the surface resistance measuring element.
7. The lithium battery separator surface resistance measuring device of claim 1, wherein the separator is pressed between the upper electrode assembly and the lower electrode assembly.
8. The lithium battery isolation membrane surface resistance measurement device of claim 1, wherein the upper electrode body is made of anodized stainless steel or aluminum alloy, and the upper electrode body is a cylinder with a diameter of 20mm to 40 mm.
9. The lithium battery separator surface resistance measuring device of claim 1, wherein the bottom surface of the insulating element and the bottom surface of the upper electrode body form a coplanar surface with a diameter of between 25mm and 50 mm.
10. The lithium battery separator surface resistance measuring device of claim 1, wherein the receiving groove is a circular bottom surface with a diameter between 30mm and 55 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020167787.1U CN212134814U (en) | 2020-02-14 | 2020-02-14 | Lithium battery isolation film surface resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020167787.1U CN212134814U (en) | 2020-02-14 | 2020-02-14 | Lithium battery isolation film surface resistance measuring device |
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| Publication Number | Publication Date |
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| CN212134814U true CN212134814U (en) | 2020-12-11 |
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| CN202020167787.1U Active CN212134814U (en) | 2020-02-14 | 2020-02-14 | Lithium battery isolation film surface resistance measuring device |
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