CN115780304A - Method for detecting whether surface of soft package lithium battery is damaged or not and quality detection method thereof - Google Patents
Method for detecting whether surface of soft package lithium battery is damaged or not and quality detection method thereof Download PDFInfo
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- CN115780304A CN115780304A CN202211613007.1A CN202211613007A CN115780304A CN 115780304 A CN115780304 A CN 115780304A CN 202211613007 A CN202211613007 A CN 202211613007A CN 115780304 A CN115780304 A CN 115780304A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of lithium batteries, and provides a method for detecting whether the surface of a soft package lithium battery is damaged or not and a quality detection method thereof. A method for detecting whether a surface is damaged or not, comprising: two leads L 1 、L 2 Electrically connected with different positions of the aluminum layer of the battery aluminum-plastic film, and testing the resistance value R 0 (ii) a The battery clamp is arranged between two clamping plates, the two clamping plates are provided with conductive surfaces, the conductive surfaces are in contact with the surface of the battery, and the conductive surfaces of the two clamping plates are respectively in contact with the lead L 3 、L 4 Electrically connecting; test L 1 And L 3 Resistance value R between 1 Test L 1 And L 4 Resistance value R between 2 (ii) a Comparison of R 1 Or R 2 And R 0 If the difference between the two values is obvious, the comparison with L is shown 3 Or L 4 The protective layer on the side of the cell in contact with the conductive surface to be connected is damaged, otherwise, the protective layer is not damaged. The quality inspection method comprisesThe detection method is described. The detection method provided by the invention can effectively carry out quantitative measurement on the damaged area on the surface of the battery, and avoids the occurrence of screen leakage/screening caused by damage of the aluminum-plastic film.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a method for detecting whether the surface of a soft package lithium battery is damaged or not and a quality detection method thereof.
Background
At present, the main outside of soft packet of lithium cell mainly adopts the plastic-aluminum membrane to fold core/roll up the core and protect, but often can appear dashing the hole in conventional production process, the manipulator, the transportation causes the outward appearance of battery bad, for example, hole point, pinhole, mar, the general inspection mode to this kind of inefficacy is that personnel's visuals or adopt CCD to inspect at present, adopt artifical visual can't accurate inspection plastic-aluminum membrane impaired severity, and adopt CCD to inspect often can have the condition of sieving, consequently, need to have a detection method of detection battery outward appearance damaged degree.
The aluminum plastic film structure adopted in the industry currently is a nylon layer, an aluminum layer and a PP layer, the nylon layer plays a role in wear resistance and aluminum layer protection, the aluminum layer plays a role in water and oxygen isolation, the PP layer plays a role in heat sealing and electrolyte isolation, when the aluminum plastic film fails, the most important thing is the failure of the aluminum layer and the PP layer, when the nylon layer of the battery is scratched, no influence is caused on the aluminum plastic film, in other words, the nylon layer is not completely damaged/the aluminum layer is not exposed, and the aluminum plastic film still plays a role in protection on the battery.
Disclosure of Invention
The invention aims to provide a method for detecting whether the surface of a soft package lithium battery is damaged or not and a quality detection method thereof, aiming at improving at least one problem mentioned in the background technology.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a method for detecting whether a surface of a soft package lithium battery is damaged, including:
two leads L 1 、L 2 Electrically connected with different positions of the aluminum layer of the battery aluminum-plastic film, and testing the resistance value R 0 ；
The battery clamp is arranged between two clamping plates, the two clamping plates are provided with conductive surfaces, the conductive surfaces are in contact with the surface of the battery, and the conductive surfaces of the two clamping plates are respectively in contact with the lead L 3 、L 4 Electrically connecting;
test L 1 And L 3 Resistance value R between 1 Test L 1 And L 4 Resistance value R between 2 ；
Comparison of R 1 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 3 The protective layer on one surface of the battery contacted with the connected conductive surface is damaged, otherwise, the protective layer is not damaged;
comparison of R 2 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 4 The protective layer on the side of the cell to which the conductive surface is connected is damaged, otherwise none.
In an alternative embodiment, the clamping plate is made of a soft conductive material, so that when the clamping plate is applied with force to clamp the battery, the clamping plate can be filled to the damaged part on the surface of the battery to be contacted with the aluminum layer.
In an optional embodiment, the clamping plate is made of a non-soft conductive material, and the conductive surface is formed by arranging a layer of soft conductive material on the surface of the clamping plate, so that when the battery is clamped by applying force to the clamping plate, the conductive surface can be filled to the damaged part on the surface of the battery to be contacted with the aluminum layer.
In an alternative embodiment, the current is passed through the conductor L 1 And L 2 A conductive bayonet is connected on the aluminum layer, and the conductive bayonet is contacted with the aluminum layer.
In an optional embodiment, after the conductive bayonet is in contact with the aluminum layer, the contact between the two conductive bayonet and the aluminum layer is detected by a resistance detection device, and when the detection result shows that the conductive bayonet is conducted with the aluminum layer, formal detection work is started.
In an alternative embodiment, the area of the clamping plate is greater than or equal to the area of one side of the battery, and when the clamping plate is tightly attached to the surface of the battery for detection, the projection of the side of the battery on the plane where the clamping plate is located is completely located in the clamping plate.
In an alternative embodiment, the detection method is implemented by using a detection tool, and the detection tool comprises two clamping plates capable of moving relatively.
In an alternative embodiment, the protective layer of the soft package lithium battery is a nylon layer.
In a second aspect, the present invention provides a quality inspection method for a soft package lithium battery, including a method for detecting whether the surface of the soft package lithium battery is damaged according to any one of the foregoing embodiments.
The beneficial effects of the embodiment of the invention include, for example:
the detection method provided by the application can detect whether the protective layer on the surface of the soft package lithium battery is damaged or not. If the protective layer is not damaged, the conductive surface of the splint can only contact with the nylon 3 Or L 4 Can not form conduction with the aluminum layer on the surface of the battery (the resistance is large enough), and R is measured when the resistance is tested 0 And R 1 Or R 2 The difference of the test results is very obvious, and if the protective layer is damaged, the conductive surface of the clamping plate is contacted with the damaged part L 3 Or L 4 Conducting with the aluminum layer on the surface of the battery, and testing the resistance 0 And R 1 Or R 2 The test results of (2) are not very different. Thus, R is 1 Or R 2 And R 0 The comparison can determine whether the protective layer on the surface of the battery is damaged. The test method provided by the application is simple and convenient, whether the battery surface protection layer is damaged or not can be quickly tested, the method can effectively carry out quantitative measurement on the damaged area of the surface of the battery, and screen leakage/screening of damage of an aluminum-plastic film is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, 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, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a histogram of broken and normal cell resistance;
FIG. 2 is a schematic diagram of a detection method according to an embodiment of the present disclosure when detecting damage to a surface of a battery;
fig. 3 is a schematic structural diagram of the clamping plate and the conductive surface thereof.
Icon: 11-a battery; 12-a splint; 13-conductive surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
As shown in fig. 2, an embodiment of the present application provides a method for detecting whether a surface of a soft package lithium battery 11 is damaged, including:
two lead wires L 1 、L 2 Electrically connected with different positions of the aluminum layer of the aluminum plastic film of the battery 11 and tested for resistance value R 0 ；
The battery 11 is clamped between two clamping plates 12, each clamping plate 12 is provided with a conductive surface 13, the conductive surfaces 13 are in contact with the surface of the battery 11, and the conductive surfaces 13 of the two clamping plates 12 are respectively in contact with the lead L 3 、L 4 Electrically connecting;
test L 1 And L 3 Resistance value R between 1 Test L 1 And L 4 Resistance value R between 2 ；
Comparison of R 1 And R 0 If the difference between the two values is obvious, the comparison with L is shown 3 The protective layer on the side of the battery 11 contacted by the connected conductive surface 13 is damaged, otherwise, the protective layer is not damaged;
comparison of R 2 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 4 The protective layer of the side of the battery 11 that is in contact with the conductive surface 13 to be connected is broken, whereas it is not.
The detection method provided by the application can detect whether the protective layer on the surface of the soft package lithium battery 11 is damaged or not, and as shown in fig. 1, the resistance of the battery 11 with the damaged protective layer is obviously different from that of the normal battery 11. L if the protective layer is not damaged and the conductive surface 13 of the splint 12 can only contact with nylon 3 Or L 4 It is impossible to establish conduction with the aluminum layer on the surface of the battery 11 (resistance is sufficiently large), and R is measured when the resistance is measured 0 And R 1 Or R 2 The difference between the test results is very obvious, and if there is a damage on the protection layer, the conductive surface 13 of the clamping plate 12 contacts the damaged portion, L 3 Or L 4 Conducting with the aluminum layer on the surface of the battery 11, and testing the resistance 0 And R 1 Or R 2 The test results of (2) are not very different. Thus, R is substituted 1 Or R 2 And R 0 Then compare it withIt is possible to determine whether or not the protective layer on the surface of the battery 11 is broken. The test method provided by the application is simple and convenient, whether the surface protection layer of the battery 11 is damaged or not can be rapidly tested, the method can effectively carry out quantitative measurement on the damaged area of the surface of the battery, and screen leakage/screening of damage of an aluminum-plastic film is avoided.
Specifically, if there is a damage to the protective layer, in order to ensure that the conductive surface 13 of the clamping plate 12 can be completely contacted with the damaged portion: the clamping plate 12 is made of soft conductive material, so that when the battery 11 is clamped by applying force to the clamping plate 12, the clamping plate 12 can be filled until the damaged part on the surface of the battery 11 is contacted with the aluminum layer; alternatively, the clamping plate 12 is made of a non-soft conductive material, and the conductive surface 13 is made of a soft conductive material (as shown in fig. 3) disposed on the surface of the clamping plate 12, so that the conductive surface 13 can be filled to the damaged portion of the surface of the battery 11 to contact the aluminum layer when the battery 11 is clamped by applying a force to the clamping plate 12.
It should be noted that the protective layer referred to in this application mainly refers to a nylon layer, and the outermost layer of the soft-package battery 11 is generally made of nylon material, but it should be noted that the detection method provided in this application is also applicable to a protective layer made of non-nylon material.
The test method specifically comprises the following steps:
s1, preparing a tool, wherein the tool comprises two clamping plates 12 capable of moving relatively, and the mutually opposite surfaces of the two clamping plates 12 are conductive surfaces 13;
the battery 11 is placed in a tool, two conductive stabbing knives for connecting two leads are in contact with an aluminum layer of an aluminum plastic film of the battery 11, and the specific contact position is a position where the upper end of the battery 11 is not in contact with the clamping plate 12.
Further, the area of the clamping plate 12 is larger than or equal to the area of one side surface of the battery 11, and when the clamping plate 12 is tightly attached to the surface of the battery 11 for detection, the projection of the side surface of the battery 11 on the plane where the clamping plate 12 is located is completely located in the clamping plate 12; that is, after the battery 11 is clamped by the clamping plate 12, one side surface of the battery 11 is completely contacted with the conductive surface 13 of the clamping plate 12, so as to ensure that the side surface of the battery 11 can be fully detected.
And S2, detecting the contact between the two conductive bayonet and the aluminum layer through a resistance detection device after the conductive bayonet is contacted with the aluminum layer, carrying out formal detection on the next step when the detection result shows that the conductive bayonet is conducted with the aluminum layer and the detection device feeds back OK, and resetting the conductive bayonet to conduct the conductive bayonet with the aluminum layer if the detection device feeds back NG shows that the conductive bayonet is not conducted with the aluminum layer.
S2, controlling the two clamping plates 12 to move relatively to clamp the battery 11 between the two clamping plates 12, enabling the conductive surface 13 to be tightly attached to the surface of the battery 11, and testing L by adopting a resistance detection device 1 、L 2 R between 0 ；
Test L 1 And L 3 Resistance value R between 1 Test L 1 And L 4 Resistance value R between 2 ；
Comparison of R 1 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 3 The surface of the battery 11 contacted by the connected conductive surface 13 is damaged, otherwise, the surface is not damaged;
comparison of R 2 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 4 The surface of the battery 11 that is in contact with the conductive surface 13 to be connected is damaged, whereas it is not.
In summary, the detection method provided by the present application can detect whether the protection layer on the surface of the soft package lithium battery 11 is damaged. If the protective layer is not damaged, the conductive surface 13 of the clamping plate 12 can only contact with nylon, so that the L3 or L4 cannot be conducted with the aluminum layer on the surface of the battery 11 (the resistance is large enough), the difference between the test results of R0 and R1 or R2 is very obvious when the resistance is tested, if the protective layer is damaged, the conductive surface 13 of the clamping plate 12 contacts with the damaged part, so that the L3 or L4 is conducted with the aluminum layer on the surface of the battery 11, and the difference between the test results of R0 and R1 or R2 when the resistance is tested is not large. Therefore, comparing R1 or R2 with R0 makes it possible to determine whether or not there is a breakage of the protective layer on the surface of the battery 11. The test method provided by the application is simple and convenient, whether the surface protection layer of the battery 11 is damaged or not can be rapidly tested, the method can be used for effectively quantitatively measuring the damaged area of the surface of the battery, and the phenomenon that the aluminum-plastic film is damaged and leaks/screens is avoided.
The embodiment of the application further provides a quality inspection method for the soft package lithium battery 11, which includes the method for detecting whether the surface of the soft package lithium battery 11 provided by the embodiment of the application is damaged.
When the soft package lithium battery 11 is subjected to quality inspection, one of the detection items comprises whether the protective layer on the surface of the soft package lithium battery is damaged or not, and the method for detecting the protective layer in the quality inspection method is the method provided by the application, so that the quality inspection method is simple and quick.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for detecting whether the surface of a soft package lithium battery is damaged is characterized by comprising the following steps:
two leads L 1 、L 2 Electrically connected with different positions of the aluminum layer of the battery aluminum-plastic film, and testing the resistance value R 0 ；
The battery clamp is arranged between two clamping plates, the two clamping plates are provided with conductive surfaces, the conductive surfaces are in contact with the surface of the battery, and the conductive surfaces of the two clamping plates are respectively in contact with a lead L 3 、L 4 Electrically connecting;
test L 1 And L 3 Resistance value R between 1 Test L 1 And L 4 Resistance value R between 2 ；
Comparison of R 1 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 3 The protective layer on one surface of the battery contacted with the connected conductive surface is damaged, otherwise, the protective layer is not damaged;
comparison of R 2 And R 0 If the difference between the two values is obvious, the value is shown as being equal to L 4 The protective layer on the side of the cell in contact with the conductive surface to be connected is damaged, otherwise, the protective layer is not damaged.
2. The method as claimed in claim 1, wherein the clamping plate is made of a soft conductive material so that the clamping plate can be filled until a damaged portion of the surface of the battery comes into contact with the aluminum layer when the battery is clamped by applying a force to the clamping plate.
3. The detection method according to claim 1, wherein the clamping plate is made of a non-soft conductive material, and the conductive surface is formed by providing a layer of a soft conductive material on the surface of the clamping plate so that the conductive surface can be filled until the damaged portion of the surface of the battery is in contact with the aluminum layer when the battery is clamped by applying force to the clamping plate.
4. The detection method according to claim 1, wherein the detection is performed by a wire L 1 And L 2 A conductive bayonet is connected on each of the aluminum layers and is in contact with the aluminum layer.
5. The detection method as claimed in claim 4, wherein after the conductive bayonet contacts the aluminum layer, the contact between the two conductive bayonet and the aluminum layer is detected by a resistance detection device, and when the detection result shows that the conductive bayonet is conducted with the aluminum layer, formal detection work is started.
6. The detection method according to claim 1, wherein the area of the clamping plate is larger than or equal to the area of one side face of the battery, and when the clamping plate is tightly attached to the surface of the battery for detection, the projection of the side face of the battery on the plane where the clamping plate is located is completely located in the clamping plate.
7. The inspection method of claim 1, including employing an inspection tool comprising two of said jaws that are movable relative to each other to perform said inspection method.
8. The detection method according to claim 1, wherein the protective layer of the soft package lithium battery is a nylon layer.
9. A quality inspection method for a soft package lithium battery, characterized by comprising the method for detecting whether the surface of the soft package lithium battery is damaged according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211613007.1A CN115780304A (en) | 2022-12-15 | 2022-12-15 | Method for detecting whether surface of soft package lithium battery is damaged or not and quality detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211613007.1A CN115780304A (en) | 2022-12-15 | 2022-12-15 | Method for detecting whether surface of soft package lithium battery is damaged or not and quality detection method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115780304A true CN115780304A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211613007.1A Pending CN115780304A (en) | 2022-12-15 | 2022-12-15 | Method for detecting whether surface of soft package lithium battery is damaged or not and quality detection method thereof |
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|---|---|
| CN (1) | CN115780304A (en) |
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- 2022-12-15 CN CN202211613007.1A patent/CN115780304A/en active Pending
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