CN209842005U - Battery diaphragm breakdown voltage testing arrangement - Google Patents
Battery diaphragm breakdown voltage testing arrangement Download PDFInfo
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- CN209842005U CN209842005U CN201920083554.0U CN201920083554U CN209842005U CN 209842005 U CN209842005 U CN 209842005U CN 201920083554 U CN201920083554 U CN 201920083554U CN 209842005 U CN209842005 U CN 209842005U
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Abstract
The utility model provides a battery diaphragm breakdown voltage testing arrangement, including direct current test circuit, first electrode and portable anchor clamps, portable anchor clamps include the second electrode, direct current test circuit respectively with portable anchor clamps first electrode electricity is connected. The direct current test circuit is respectively electrically connected with the movable clamp and the first electrode, a low voltage value is set in the direct current test circuit as an upper limit value of withstand voltage, the diaphragm is laid on the first electrode, the movable clamp is pushed to enable the second electrode to be in contact with the diaphragm, the normal diaphragm is not broken down below the upper limit value of the low voltage in the test process, if the diaphragm has a weak point, the withstand voltage value is lower than the upper limit value, the diaphragm is broken down, and the direct current test circuit detects and displays the breakdown voltage value of the broken-down point. The testing device can test the diaphragm with large area, and can effectively test whether the diaphragm has weak points, the positions of the weak points and corresponding breakdown voltage values.
Description
Technical Field
The utility model relates to a lithium ion battery material test field particularly, mainly relates to a battery diaphragm breakdown voltage testing arrangement.
Background
The lithium ion battery is widely applied to digital products such as mobile phones, notebook computers and the like and new energy automobiles, and has the advantages of long cycle life, small self-discharge, no pollution, no memory effect and the like. In recent years, the safety of batteries has attracted more and more attention than the safety of batteries.
And the separator, as one of four major materials of the lithium ion battery, is a key internal component in the lithium ion battery although not participating in electrochemical reactions in the battery. The charge-discharge current density, the cycle performance and other key performances of the battery are directly related to the diaphragm, and the improvement of the diaphragm performance plays an important role in improving the performance of the lithium ion battery.
When the short circuit test of the battery core is carried out, if the breakdown voltage of the diaphragm is small, the diaphragm is easy to be broken down in the short circuit test process of the battery core, so that the loss of a winding core is caused, and the yield of the battery is influenced. Because the size distribution of the pores of the diaphragm is not uniform, the film surface is not uniform, and the weak point that the diaphragm is easy to break down exists. The method for testing the breakdown voltage of the diaphragm by the prior art is a test of a single point or a fixed area, the single point test range is small, although the value of the breakdown voltage of the diaphragm can be accurately tested, the test of some positions cannot be carried out, and the weak point of the breakdown voltage on the diaphragm is easy to ignore; in the fixed area test, two electrode plates with the side length of 50-800 mm are used for clamping a diaphragm with a certain area, only a small diaphragm with the size corresponding to that of the electrode plates can be tested, the sampling has randomness, the test range is limited, the larger or thicker the electrode plates are, the larger the influence of the surface roughness is, the electrode plates are not completely attached to the tested diaphragm, the measured data is not necessarily the lowest pressure resistance value in the diaphragm, and the larger the weight is applied to the tested diaphragm, the smaller the test value is easily compared with the true value.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a battery diaphragm breakdown voltage testing arrangement, can measure the diaphragm effectively through this testing arrangement whether there is the position of weak point and weak point.
For the purpose of the utility model discloses above the realization, the utility model provides a battery diaphragm breakdown voltage testing arrangement, including direct current test circuit, first electrode and portable anchor clamps, portable anchor clamps include the second electrode, direct current test circuit respectively with portable anchor clamps first electrode electricity is connected, first electrode is the plate electrode.
As a further improvement of the above technical solution, the movable clamp includes a conductive rod serving as the second electrode and an insulating handle connected to the conductive rod.
As a further improvement of the above technical solution, the movable clamp includes a conductive plate serving as the second electrode and an insulating handle connected to the conductive plate.
As a further improvement of the technical scheme, the surface roughness Ra of the second electrode is less than or equal to 1.25.
As a further improvement of the above technical solution, the second electrode material is metal or conductive rubber.
As a further improvement of the above technical solution, the clamping device further comprises a driving device, and the movable clamp is mounted on the driving device.
As a further improvement of the above technical scheme, the portable terminal device further comprises a support frame, wherein the support frame comprises a first cross rod, a first connecting column, a second connecting column and a second cross rod, one end of the first connecting column and one end of the second connecting column are respectively installed at two ends of the first cross rod, the other end of the first connecting column and the other end of the second connecting column are respectively installed at two ends of the second cross rod, the first cross rod is parallel to the second cross rod, the first cross rod is connected with the insulating handle, and the conductive rod is sleeved on the outer wall of the second cross rod.
As a further improvement of the technical proposal, the conductive rod is rotatably connected with the outer wall of the second cross bar
As a further improvement of the technical scheme, the length of the electrode plate is 200-400 mm, the width of the electrode plate is 200-400 mm, and the thickness of the electrode plate is 1-5 mm.
As a further improvement of the technical scheme, the surface roughness Ra of one surface of the electrode plate, which is opposite to the movable clamp, is less than or equal to 1.25.
The utility model has the advantages that:
the utility model provides a battery diaphragm breakdown voltage testing arrangement, including direct current test circuit, first electrode and portable anchor clamps, portable anchor clamps include the second electrode, direct current test circuit respectively with portable anchor clamps first electrode electricity is connected. The direct current test circuit is respectively electrically connected with the movable clamp and the first electrode, a low voltage value is set in the direct current test circuit as an upper limit value of withstand voltage, the diaphragm is laid on the first electrode, the movable clamp is pushed to enable the second electrode to be in contact with the diaphragm, the normal diaphragm is not broken down below the upper limit value of the low voltage in the test process, if the diaphragm has a weak point, the withstand voltage value is lower than the upper limit value, the diaphragm is broken down, and the direct current test circuit detects and displays the breakdown voltage value of the broken-down point. The testing device can test the diaphragm with large area, and can effectively test whether the diaphragm has weak points, the positions of the weak points and corresponding breakdown voltage values.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
Fig. 1 is a schematic structural diagram of a movable clamp according to an embodiment of the present invention.
Description of the main element symbols:
10. a movable clamp; 20. a conductive rod; 31. a first cross bar; 32. a first connecting column; 33. a second connecting column; 40. an insulated handle.
Detailed Description
Hereinafter, various embodiments of the present invention will be described more fully. The present invention is capable of various embodiments and of being modified and varied therein. However, it should be understood that: there is no intention to limit the various embodiments of the invention to the specific embodiments disclosed herein, but on the contrary, the intention is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the invention.
Hereinafter, the terms "includes" or "may include" used in various embodiments of the present invention indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to refer only to the particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combination of the foregoing.
In various embodiments of the present invention, the expression "a or/and B" includes any or all combinations of the words listed simultaneously, e.g. may include a, may include B or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
Referring to fig. 1, a device for testing a breakdown voltage of a battery diaphragm includes a dc test circuit, a first electrode and a movable clamp 10, where the movable clamp 10 includes a second electrode, and the dc test circuit is electrically connected to the movable clamp 10 and the first electrode, respectively.
The direct current test circuit is electrically connected with the movable clamp 10 and the first electrode respectively, a low voltage value is set in the direct current test circuit as an upper limit value of withstand voltage, the diaphragm is laid on the first electrode, the movable clamp 10 is pushed to enable the second electrode to be in contact with the diaphragm, the diaphragm is moved when appropriate, therefore, the whole diaphragm can be tested, the normal diaphragm is not broken down below the upper limit value of the low voltage in the test process, if the diaphragm has a weak point, the withstand voltage value is lower than the upper limit value, the diaphragm can be broken down, and the direct current test circuit detects and displays the breakdown voltage value of the broken-down point. The testing device can test the diaphragm with large area, and can effectively test whether the diaphragm has weak points, the positions of the weak points and corresponding breakdown voltage values.
In this embodiment, the first electrode is an electrode plate.
In the embodiment, the upper limit of the voltage set by the direct current test circuit is 0.5KV, and the leakage current is 0.1 to 12 mA.
The direct current test circuit is provided with 0.5KV as the upper limit value of withstand voltage, a normal diaphragm is not broken down under low voltage in the test process, if the diaphragm has a weak point, the withstand voltage value is lower than 0.5KV, the diaphragm is broken down, the direct current test circuit detects that the leakage current buzzer alarms and stops scanning, the displayed voltage value is recorded, and the test is restarted until all diaphragms are scanned completely to finish the test.
In other embodiments, the upper limit of the voltage may be set according to actual requirements, such as 0.6KV, 0.7KV, 0.8KV or 1.5 KV.
Optionally, the surface roughness Ra of the second electrode in the movable clamp 10 is less than or equal to 1.25. When the surface roughness of the second electrode in the movable clamp 10 is large, the second electrode in the movable clamp 10 cannot be completely attached to the diaphragm, and the measured breakdown voltage value is inaccurate. In the embodiment, the surface roughness Ra of the second electrode is less than or equal to 1.25, so that the second electrode in the movable clamp is more attached to the diaphragm, and the measured breakdown voltage value is accurate.
Preferably, the test effect is best when the surface roughness Ra of the second electrode of the movable clamp 10 is less than or equal to 0.7.
Optionally, the length of the electrode plate is 200-400 mm, the width is 200-400 mm, and the thickness is 1-5 mm.
Optionally, the surface roughness Ra of the surface of the electrode plate opposite to the movable clamp 10 is less than or equal to 1.25.
Optionally, a driving device is further included, and the movable clamp 10 is mounted on the driving device. The movable fixture 10 is driven by the driving device to make the second electrode in sliding contact with the diaphragm until the diaphragm is completely scanned, so as to finish the test.
Optionally, the second electrode material is metal or conductive rubber.
Optionally, the movable clamp 10 includes a conductive rod 20 serving as the second electrode and an insulated handle 40 connected to the conductive rod 20.
As described above, the insulating handle 40 can be held by hand to push the conductive rod 20 to slide on the diaphragm so as to test the breakdown voltage value of the diaphragm. The circular conductive rod 20 is selected to slide smoothly on the diaphragm with less obstruction.
Preferably, the conductive rod 20 is a metal rod, and the metal rod has the characteristics of good conductivity and convenience in measurement accuracy.
More preferably, the conductive rod 20 is a rubber rod, and the rubber rod has the characteristics of good conductivity, light weight and convenience in measurement accuracy.
Optionally, the surface roughness Ra of the conductive rod 20 is less than or equal to 1.25.
Preferably, the surface roughness Ra of the conductive rod 20 is less than or equal to 0.7.
Optionally, still include the support frame, the support frame includes first horizontal pole 31, first spliced pole 32, second spliced pole 33 and second horizontal pole, the one end of first spliced pole 32 with the one end of second spliced pole 33 install respectively in the both ends of first horizontal pole 31, the other end of first spliced pole 32 with the other end of second spliced pole 33 install respectively in the both ends of second horizontal pole, first horizontal pole 31 with the second horizontal pole is parallel, first horizontal pole 31 with insulated handle 40 connects, conducting rod 20 cover is located the outer wall of second horizontal pole.
As an embodiment, the conductive rod 20 is not rotatable with respect to the outer wall of the second rail.
As another possible embodiment, the conductive rod 20 is rotatably connected with respect to the outer wall of the second cross bar.
Above-mentioned, the conducting rod 20 can direct contact diaphragm and easy roll, and the conducting rod 20 rolls the contact diaphragm and can reduce the frictional force between conducting rod 20 and the diaphragm, reduces the impaired probability of diaphragm, and the voltage value of test is more accurate.
Optionally, the insulating handle 40 is connected to the first cross bar 31 by bolts. In other embodiments, the insulated handle 40 and the first rail 31 may be connected by a snap fit or a dowel pin.
Optionally, the support frame is a metal support frame, a first wire interface is arranged on the support frame, and a wire of the dc test circuit is connected to the conductive rod 20 through the first wire interface.
Optionally, a second lead interface is arranged on the electrode plate, and a lead of the dc test circuit is connected to the electrode plate through the second lead interface.
Alternatively, the movable clamp 10 includes a conductive plate serving as the second electrode and an insulating handle 40 connected to the conductive plate.
Optionally, the surface roughness Ra of the conductive plate is less than or equal to 1.25.
A battery separator breakdown voltage test comprises the following steps:
1. cutting a diaphragm;
2. the parameters of the direct current test circuit are set as follows: setting the upper limit value of voltage to be 0.5KV, the upper limit value of leakage current to be 0.1-12 mA, and the rising time of voltage to be 0.5 s;
3. connecting the direct current test circuit with the first electrode; laying a membrane on the first electrode;
4. connecting the movable clamp 10 with a direct current test circuit;
5. lightly placing the movable clamp 10 on the diaphragm, starting a direct current test circuit switch, and starting a test;
6. when the test is started, the movable clamp 10 is slid to sweep the diaphragm, the tested diaphragm is moved to the left to the right when appropriate, and the whole diaphragm is sequentially swept from bottom to top;
7. when the direct current test circuit detects that the leakage current buzzer alarms, scanning is stopped, the voltage value displayed at the moment is recorded, and the test is restarted until all diaphragms are scanned to finish the test.
Example 1
In this embodiment 1, a device for testing the breakdown voltage of a battery diaphragm is adopted, and the device includes a dc test circuit, an electrode plate and a movable clamp 10, where the dc test circuit is respectively electrically connected to the movable clamp 10 and the electrode plate. The movable clamp 10 comprises a conductive rod 20 used as the second electrode and an insulating handle 40 connected to the conductive rod 20, the conductive rod 20 is made of brass material with good conductivity and strong oxidation resistance, an electrode plate with the specification of 300mm by 2mm is used as a fixed electrode, the surface roughness Ra is 1.2, and the parameters of a direct current test circuit are as follows: the upper limit of the voltage is 0.5KV, the upper limit of the leakage current is 1mA, and the rise time of the voltage is 0.5 s.
In this embodiment, a diaphragm made of 16 μmPP material is tested, and the specific operation steps are as follows:
1. cutting a 0.5m by 10m diaphragm;
2. connecting the direct current test circuit with the electrode plate, and flatly paving the diaphragm on the electrode plate;
3. connecting the conductive rod 20 to a DC test circuit;
4. placing the conductive rod 20 on the diaphragm lightly, turning on the DC test circuit switch, and starting the test;
5. when the test is started, the insulating handle 40 is held by hand to enable the conductive rod 20 to slide on the diaphragm, and the conductive rod sequentially sweeps the whole diaphragm from bottom to top;
6. when the direct current test circuit detects that the leakage current buzzer alarms, scanning is stopped, the position is recorded, and the test is restarted until the diaphragm is completely scanned to finish the test.
Breakdown voltage point specification of diaphragm surface made of table 116 mu mPP material
| Test area (m2) | 5.0 |
| Test voltage (KV) | 0.5 |
| Number of detected weak points | 2 |
Example 2
The battery diaphragm breakdown voltage testing device adopted in the example 2 comprises a direct current testing circuit, an electrode plate and a movable clamp 10, wherein the direct current testing circuit is electrically connected with the movable clamp 10 and the electrode plate respectively. Wherein the movable fixture 10 is composed of a conductive plate used as the second electrode and an insulating handle 40 connected to the conductive plate, the conductive plate on the fixture for testing the breakdown voltage of the diaphragm is made of brass material with good conductivity and strong oxidation resistance, an electrode plate with the specification of 300mm 2mm is used as a fixed electrode, the surface roughness Ra is 1.2, and the parameters of the direct current test circuit are as follows: the upper limit value of the voltage is 0.8KV, the upper limit of the leakage current is 1mA, and the rise time of the voltage is 0.5 s.
In this example, the specific operation steps of testing the diaphragm made of 16 μmPP material are the same as those in example 1, and the test result is as follows:
breakdown voltage point specification of diaphragm surface made of 216 mu mPP material
| Test area (m2) | 5.0 |
| Test voltage (KV) | 0.8 |
| Number of detected weak points | 5 |
Comparative example
The membrane of 16 mu mPP material is cut into an area of 0.5m by 10m by adopting a test of a 50-point electrode method in GB/T13542.2-2009 to be detected, and the numerical results of breakdown voltage are as follows:
TABLE 3 breakdown Voltage Point details tested by the method in GB/T13542.2-2009
| Test area (m2) | 0.02 |
| Minimum value of breakdown voltage | 1.8 |
| Maximum value of breakdown voltage | 2.4 |
| Point number less than 0.5KV | 0 |
| Point number < 0.8V | 0 |
The test result shows that the breakdown voltage data tested by the GB/T13542.2-2009 method is between 1.8 and 2.4KV, but the breakdown voltage range tested by the GB/T13542.2-2009 method is limited, and the area of the diaphragm which can only be tested at 50 points is 0.02m2And each point on the membrane surface can not be detected, the minimum value of the measured breakdown voltage is 1.8KV, the minimum value belongs to the normal range of the withstand voltage of the diaphragm, and data lower than 0.5KV and 0.8KV are not found. And adopt the utility model discloses the method of embodiment 1 and embodiment 2, because the area of scan test is big, survey 5m2The membrane, found a total of less than 0.5KV at 2 and less than 0.8KV at 5.
The event the utility model discloses a weak point of diaphragm can be found effectively to the method, and the sign that can be better goes out the good or bad of diaphragm resistance to pressure, provides effectual data for the battery producer and gets rid of the problem diaphragm to reduce the diaphragm and cause the influence of battery short circuit because of withstand voltage problem.
It should be noted that: in the present invention, unless otherwise explicitly specified or defined, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present invention, it should be understood by those skilled in the art that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, other various changes and modifications can be made according to the above-described technical solutions and concepts, and all such changes and modifications should fall within the protection scope of the present invention.
Claims (10)
1. The device for testing the breakdown voltage of the battery diaphragm is characterized by comprising a direct current test circuit, a first electrode and a movable clamp, wherein the movable clamp comprises a second electrode, the direct current test circuit is respectively electrically connected with the movable clamp and the first electrode, and the first electrode is an electrode plate.
2. The battery separator breakdown voltage testing device of claim 1, wherein the movable clamp comprises a conductive rod serving as the second electrode and an insulating handle connected to the conductive rod.
3. The battery separator breakdown voltage testing device of claim 1, wherein the movable clamp includes a conductive plate serving as the second electrode and an insulated handle connected to the conductive plate.
4. The battery separator breakdown voltage testing device of claim 1, wherein the surface roughness Ra of the second electrode is less than or equal to 1.25.
5. The battery separator breakdown voltage testing device of claim 1, wherein the second electrode material is metal or conductive rubber.
6. The battery separator breakdown voltage testing device of claim 1, further comprising a driving device on which the movable clamp is mounted.
7. The device for testing the breakdown voltage of the battery diaphragm according to claim 2, further comprising a support frame, wherein the support frame comprises a first cross rod, a first connecting column, a second connecting column and a second cross rod, one end of the first connecting column and one end of the second connecting column are respectively mounted at two ends of the first cross rod, the other end of the first connecting column and the other end of the second connecting column are respectively mounted at two ends of the second cross rod, the first cross rod is parallel to the second cross rod, the first cross rod is connected with the insulating handle, and the conductive rod is sleeved on the outer wall of the second cross rod.
8. The battery separator breakdown voltage testing device of claim 7, wherein the conductive bar is rotatably coupled with respect to an outer wall of the second rail.
9. The device for testing the breakdown voltage of the battery separator according to claim 1, wherein the electrode plate has a length of 200-400 mm, a width of 200-400 mm and a thickness of 1-5 mm.
10. The device for testing the breakdown voltage of the battery separator as claimed in claim 9, wherein the surface roughness Ra of the surface of the electrode plate opposite to the movable clamp is less than or equal to 1.25.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920083554.0U CN209842005U (en) | 2019-01-16 | 2019-01-16 | Battery diaphragm breakdown voltage testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920083554.0U CN209842005U (en) | 2019-01-16 | 2019-01-16 | Battery diaphragm breakdown voltage testing arrangement |
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| CN209842005U true CN209842005U (en) | 2019-12-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077422A (en) * | 2019-12-31 | 2020-04-28 | 河北金力新能源科技股份有限公司 | Lithium ion battery diaphragm breakdown strength testing device and testing method thereof |
| CN111707965A (en) * | 2020-05-26 | 2020-09-25 | 欣旺达电动汽车电池有限公司 | Lithium ion battery short circuit test method |
-
2019
- 2019-01-16 CN CN201920083554.0U patent/CN209842005U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077422A (en) * | 2019-12-31 | 2020-04-28 | 河北金力新能源科技股份有限公司 | Lithium ion battery diaphragm breakdown strength testing device and testing method thereof |
| CN111707965A (en) * | 2020-05-26 | 2020-09-25 | 欣旺达电动汽车电池有限公司 | Lithium ion battery short circuit test method |
| CN111707965B (en) * | 2020-05-26 | 2022-08-09 | 欣旺达电动汽车电池有限公司 | Lithium ion battery short circuit test method |
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