CN215180460U

CN215180460U - Edge voltage test fixture

Info

Publication number: CN215180460U
Application number: CN202121305156.2U
Authority: CN
Inventors: 周洋
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-12-14
Anticipated expiration: 2031-06-10

Abstract

The utility model discloses a limit voltage test fixture for the banding voltage of test electric core, electric core include the body and locate anodal utmost point ear and negative pole utmost point ear on the body, and the body has length direction and width direction, and anodal utmost point ear is used for carrying out the electric conductance with the tester and leads to, and limit voltage test fixture includes: the base is made of insulating materials and provided with a horizontal binding surface, and the binding surface is used for binding a horizontal plane during testing; electrically conductive piece installs on the base, including installation department and test section, the installation department is connected with the base to be used for carrying out the electric conduction with the tester, test section protrusion in base, be used for carrying out the electric conduction with the edge of body, wherein, the body laminating is on the horizontally plane. The utility model discloses a limit voltage test fixture can test the aluminium-plastic membrane in the electric core fast and break the electric potential between back aluminium-plastic membrane and the anodal utmost point ear to obtain the degree of breaking of aluminium-plastic membrane.

Description

Edge voltage test fixture

Technical Field

The utility model relates to an aluminium-plastic film of electricity core detects technical field, especially relates to a limit voltage test fixture.

Background

The lithium ion battery consists of a positive electrode, a negative electrode, a diaphragm, electrolyte, a current collector and an outer package. The electrolyte in the lithium ion battery has very active chemical properties, and is very easy to catch fire or even explode when being placed in the air, so that the packaging shell of the lithium ion battery has certain corrosion resistance and very good barrier property, and the current common packaging mainly comprises a steel shell, an aluminum shell and a high polymer aluminum plastic film. Wherein, soft packet of lithium cell adopts the plastic-aluminum complex film to pack electrolyte, not only has light in weight's advantage, can also promote the specific energy of battery by a wide margin. The aluminum-plastic composite film forms edge sealing at the positive electrode and the negative electrode, and sequentially comprises a plastic layer, an aluminum layer and a PP layer from outside to inside, wherein the electrolyte is in contact with the PP layer.

Under the normal condition, voltage has between the positive negative pole of battery, and the position of positive pole and banding department is the equipotential, does not have the voltage difference, and when the PP layer in the plastic-aluminum complex film appears damaged, will form the voltage difference at banding and positive pole, outside electrically conductive instrument and banding can carry out the electric conduction, and the numerical value of voltage difference explains that inside PP is damaged more seriously more greatly more, and the damaged back appears in the PP layer, can consume the aluminium of aluminum hull to lead to corroding, directly influence the safety and the life-span of electric core.

However, no testing device for related forming tests the edge voltage of the edge sealing of the aluminum-plastic composite film in the market, during the test, a copper sulfate solution is prepared on the spot, and the copper sulfate solution and the aluminum-plastic composite film are respectively electrically conducted with the anode and the cathode of a power supply, when copper is separated out from the aluminum-plastic composite film, the aluminum-plastic composite film is damaged, but the testing mode is troublesome.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a limit voltage test fixture can conveniently test out the voltage between aluminium-plastic film and the anodal utmost point ear when damaged.

According to the utility model discloses a limit voltage test fixture of first aspect embodiment for the banding voltage of test electric core, wherein, electric core arranges in on the horizontally plane, electric core includes the body and locates anodal utmost point ear and negative pole utmost point ear on the body, the body has length direction and width direction, anodal utmost point ear with negative pole utmost point ear is toward length direction extends, the body is in anodal utmost point ear with one side formation banding of negative pole utmost point ear, anodal utmost point ear is used for carrying out the electric conduction with the tester, limit voltage test fixture includes: the base is made of an insulating material and provided with a horizontal binding surface, and the binding surface is used for binding the horizontal plane during testing; electrically conductive piece, install in on the base, including installation department and test section, the installation department with the pedestal connection for carry out the electric conduction with the tester, test section protrusion in outside the base, be used for with the banding carries out the electric conduction.

According to the utility model discloses limit voltage test fixture has following beneficial effect at least: carry out the electricity through the anodal ear of will placing the electric core on the horizontal plane and be connected with the tester to place jointly on the horizontal plane through the base rather than the electrically conductive piece of being connected, the test section of electrically conductive piece carries out the electric conduction with the edge of the banding of electric core, thereby when the plastic-aluminum membrane in the body breaks, the body of electric core this moment, anodal utmost point ear and tester constitute the return circuit of electricity intercommunication, the tester will have numerical value display, and then can judge the damaged degree of plastic-aluminum membrane according to the limit voltage result that obtains.

According to the utility model discloses a some embodiments, the base is equipped with the mounting groove, the mounting groove is located deviate from on the base planar one side, the installation department install in the mounting groove.

According to some embodiments of the present invention, the mounting groove further comprises an elastic member connected between the side wall of the mounting groove and the conductive member.

According to some embodiments of the utility model, still include the guide, the elastic component cover is located on the guide, the guide wears to establish electrically conductive piece, and both ends connect in on the base.

According to some embodiments of the utility model, the test portion is the cutting edge form, the length direction of test portion with the body width direction is mutually perpendicular.

According to some embodiments of the present invention, the conductive member includes a plurality of the test portions, a plurality of the test portions are arranged to be separated from each other in the width direction.

According to the utility model discloses a some embodiments, the surface coating of installation department has insulating material, the installation department is equipped with the connecting hole, the connecting hole be used for with the tester is connected and the electric conductance leads to.

According to some embodiments of the utility model, waist shape hole has been seted up on the base, the length direction in waist shape hole does width direction.

According to some embodiments of the utility model, seted up a plurality ofly on the base waist shape hole, it is a plurality of waist shape hole is parallel to each other and separates the setting.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a side voltage test of the battery cell in fig. 1;

fig. 3 is a schematic structural diagram of an edge voltage testing fixture according to an embodiment of the present invention;

FIG. 4 is an exploded view of the edge voltage testing fixture of FIG. 3;

FIG. 5 is a schematic structural view of the base of FIG. 4;

fig. 6 is a reference diagram of a use state of the edge voltage testing fixture according to the embodiment of the present invention;

fig. 7 is an enlarged schematic view at I in fig. 6.

Reference numerals:

the edge voltage test fixture 100;

the base 110, the binding surface 111, the gap 112, the mounting groove 113, the mounting hole 114, the positioning part 115 and the waist-shaped hole 116;

conductive member 120, mounting portion 121, connection hole 1211, test portion 122;

an elastic member 130;

a guide 140;

a battery cell 200;

the body 210, the electrolyte 211, the aluminum plastic film 212, the pp layer 2121, the aluminum layer 2122 and the nylon layer 2123;

a positive electrode tab 220;

a negative electrode tab 230;

a seal edge 240;

a tester 300.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, which is a schematic structural diagram of a battery cell 200, the battery cell 200 includes a body 210, and a positive tab 220 and a negative tab 230 that are disposed on the body 210, the body 210 has a length direction a and a width direction b, the positive tab 220 and the negative tab 230 extend in the length direction a, and the body 210 forms a sealing edge 240 on one side of the positive tab 220 and one side of the negative tab 230.

The body 210 includes an electrolyte 211 used for conducting electricity inside and an aluminum-plastic film 212 encapsulated on the surface of the electrolyte 211, and the aluminum-plastic film 212 forms an edge seal 240. Referring to fig. 2, the aluminum-plastic film 212 includes a pp layer 2121, an aluminum layer 2122, and a nylon layer 2123 in sequence from inside to outside, and the pp layer 2121 is in contact with the electrolyte 211. When pp layer 2121 is damaged, the electrolyte 211 inside penetrates into aluminum layer 2122 to form an aluminum-lithium alloy with aluminum layer 2122, thereby corroding aluminum layer 2122.

Referring to fig. 3 to fig. 6, for the edge voltage testing fixture 100 provided by the embodiment of the present invention, the edge sealing 240 of the electrical core 200 and the voltage between the positive electrode tabs 220 are used for testing the voltage between the electrical core 200 and the edge sealing 240, the electrical core 200 is disposed on the horizontal plane, the positive electrode tabs 220 of the electrical core 200 are used for electrically conducting with the tester 300, and the edge voltage testing fixture 100 includes the base 110 and the conductive piece 120.

The base 110 is made of an insulating material and has a horizontal attaching surface 111, and the attaching surface 111 is used for attaching to a horizontal plane during testing; the conductive member 120 is mounted on the base 110, and is configured to be electrically conducted with the tester 300, and includes a mounting portion 121 and a testing portion 122, the mounting portion 121 is connected to the base 110 and is electrically conducted with the tester 300, the testing portion 122 protrudes out of the base 110, and is configured to be electrically conducted with the edge of the sealing edge 240, where the battery cell 200 is attached to a horizontal plane.

Above-mentioned limit voltage test fixture 100, through placing the positive tab 220 of electric core 200 on the horizontal plane and being connected with tester 300 electrically, and place the conductive piece 120 that will be connected with it on the horizontal plane jointly through base 110, the test portion 122 of conductive piece 120 carries out the electric conduction with the edge of the banding 240 of electric core 200, thereby when the plastic-aluminum membrane 212 in the body 210 breaks, the body 210 of electric core 200, positive tab 220 and tester 300 constitute the return circuit of electric intercommunication this moment, tester 300 will have numerical value display, and then can judge the damaged degree of plastic-aluminum membrane 212 according to the electric limit voltage result that obtains.

Wherein, electric core 200 in this embodiment is soft packet of lithium cell, and anodal utmost point ear 220 and negative pole utmost point ear 230 all have certain compliance, are used for carrying out the electric conduction with tester 300 for the convenience of anodal utmost point ear 220, promote the precision of test to place electric core 200 on the horizontally plane when the test. Specifically, electrical conduction is made to the positive electrode tab 220 through a probe of the tester 300.

Accordingly, please refer to fig. 5, which is a schematic structural diagram of the base 110 in the present embodiment, wherein the base 110 has a horizontal attachment surface 111, so that the attachment surface 111 is attached to a horizontal plane during a test, for example, a horizontal desktop, to facilitate a voltage measurement.

Wherein, base 110 forms a breach 112 to conveniently push electric core 200 when the test, avoid causing to block electric core 200 and produce the damage to electric core 200.

Specifically, the base 110 in this embodiment is provided with the mounting groove 113, the mounting groove 113 is disposed on a side of the base 110 away from the plane, and the mounting portion 121 of the conductive member 120 is mounted in the mounting groove 113, so that the testing portion 122 is closer to a horizontal placing surface during testing, and is electrically connected to the edge of the sealing edge 240 of the aluminum-plastic film 212. In other embodiments, a clamping groove may be disposed on the mounting portion 121, so that the mounting portion 121 is clamped on the base 110 through the clamping groove.

In addition, in order to facilitate the positioning of the testing part 122 when the conductive member 120 is mounted on the base 110, a positioning part 115 is further formed on the base 110, the positioning part 115 protrudes out of the main body of the base 110 along the width direction a, and when the conductive member 120 is mounted in the mounting groove 113, the testing part 122 abuts against the positioning part 115.

In the present embodiment, when testing the edge voltage of the battery cell 200, one edge voltage testing fixture 100 is respectively disposed along the width direction of the battery cell 200.

Referring to fig. 3 to 6, in an embodiment of the present invention, in order to conveniently limit the position of the battery cell 200 during testing, the base 110 is fixed on a plane of external water, a waist-shaped hole 116 is formed on the base 110, the length direction of the waist-shaped hole 116 is the width direction b, so that a bolt passes through the waist-shaped hole 116 to be installed on an external horizontal supporting surface, and the waist-shaped hole 116 is arranged, so that the distance between two edge voltage testing jigs 100 can be conveniently adjusted according to the battery cells 200 with different width dimensions. It can be understood that a plurality of slotted holes 116 may be formed on the base 110, and the slotted holes 116 are spaced apart from each other in parallel, so as to prevent the base 110 from moving askew when the base 110 is fixed on an external horizontal supporting surface.

Wherein, in the utility model discloses an embodiment, base 110 adopts the glass fiber material preparation to form to when measuring not equidimension electricity core 200, reduce the damage to base 110 after dismantling base 110 many times, in other embodiments, base 110 can adopt wooden material or other insulating material preparation to form.

Referring to fig. 3 and 4, in an embodiment of the present invention, in order to reduce damage to the battery cell 200 during testing, the edge voltage testing fixture 100 of the embodiment further includes an elastic member 130, the elastic member 130 is connected between the side wall of the mounting groove 113 and the conductive member 120, so that during testing, when the battery cell 200 is pushed toward the testing portion 122, deformation caused by the excessive force that causes the testing portion 122 to pierce the aluminum-plastic film 212 is avoided, and the testing portion 122 can be buffered by installing the elastic member 130.

The elastic member 130 in this embodiment is a spring.

Referring to fig. 3 and 4, in an embodiment of the present invention, in order to enable the elastic member 130 to move along a predetermined path when being pushed by an external force and compressed, the edge voltage testing fixture 100 further includes a guide member 140, the elastic member 130 is sleeved on the guide member 140, the guide member 140 penetrates through the conductive member 120, and both ends of the guide member 140 are connected to the base 110, so that the conductive member 120 and the elastic member 130 can move along the path determined by the guide member 140 under the external force.

Specifically, the edge voltage testing fixture 100 in this embodiment includes two guiding members 140 and two elastic members 130, and each elastic member 130 is correspondingly sleeved on one guiding member 140.

In addition, referring to fig. 3, in order to fix the guide member 140, two mounting holes 114 are further formed on the base 110, and the two mounting holes 114 are formed on opposite sides of the base 110 in the width direction b, so that the conductive member 120 is locked in the base 110 by mounting two bolts in one mounting hole 114.

Referring to fig. 3, which is a schematic structural view of the conductive device 120 of the present invention, the conductive device 120 of the present embodiment is prepared by Cr12, so that the conductive device 120 has excellent wear resistance.

The conductive member 120 includes a mounting portion 121 and a test portion 122. The mounting portion 121 is provided with a connection hole 1211, and the connection hole 1211 is used for connecting and electrically communicating with the tester. Wherein an outer surface of the mounting part 121 is coated with an insulating material. Specifically, in a specific embodiment of the present invention, the insulating material coated on the outer surface of the mounting portion 121 is Polytetrafluoroethylene (PTFE), so as to ensure the adhesion force on the surface of the mounting portion 121, and avoid the falling-off phenomenon after long-term use.

Referring to fig. 3, 4, 6 and 7, in an embodiment of the present invention, the testing portion 122 is in a blade shape, it can be understood that the testing portion 122 needs to be electrically connected to the aluminum plastic film 212, and the surface of the testing portion 122 is not coated with an insulating material. The length direction of the testing portion 122 is perpendicular to the width direction b of the battery cell 200, that is, the testing portion 122 is perpendicular to the width direction of the sealing edge 240. Through being the cutting edge form with the design of test portion 122 to carry out contact electricity with banding 240 looks vertically mode and banding 240 and switch on, promote the degree of accuracy of test, avoided because of the problem of contact failure and retesting.

Wherein, for the phase-match with not unidimensional electric core 200, electrically conductive piece 120 includes a plurality of test portions 122, and a plurality of test portions 122 set up along width direction b mutual separation to when detecting with not unidimensional electric core 200, increase the position of contact, promote the degree of accuracy that detects.

Specifically, in the present embodiment, referring to fig. 7, the conductive member 120 includes three testing portions 122, and in other embodiments, other numbers of testing portions 122 may be arranged according to actual needs. Wherein, the distance c between every two adjacent test parts 122 is between 1.0mm and 1.2mm, and the width d of the blade is between 2.0mm and 2.3 mm.

The process of measuring the electric potential by the edge voltage testing fixture 100 is as follows: the edge voltage testing jig 100 is placed on a horizontal placing surface and fixed, a lead of the tester 300 is connected with the connecting hole 1211 to be electrically conducted, the battery cell 200 is placed on a horizontal plane and pushed towards the direction of the testing part 122, so that the testing part 122 is vertically abutted against the edge of the sealing edge 240, the knife-edge-shaped testing part 122 penetrates into the glue overflow part of the sealing edge 240, a probe on the tester 300 is pressed down to the positive pole tab 220, the tester 300 is electrically conducted with the positive pole tab 220, the tester 300 and the battery cell 200 form a complete loop, the edge voltage between the positive pole tab 220 and the sealing edge 240 is measured, and the damage degree of the PP layer 2121 in the aluminum-plastic film 212 is judged according to the edge voltage. That is, the larger the side voltage value is, the more damaged the PP layer 2121 becomes, and the smaller the side voltage value is, the smaller the degree of damage of the PP layer 212 becomes.

In the edge voltage testing fixture 100, the elastic member 130 is further connected between the base 110 and the conductive member 120, so as to prevent the battery cell 200 from being damaged when being pushed to the testing portion 122 for testing, and the elastic member 130 is sleeved on the conductive member 120, so as to ensure the movement path of the elastic member 130 and the conductive member 120.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. Edge voltage test fixture for the edge voltage of test electric core, wherein, on the horizontally plane was arranged in to electric core, electric core includes the body and locates anodal utmost point ear and negative pole utmost point ear on the body, the body has length direction and width direction, anodal utmost point ear with negative pole utmost point ear toward length direction extends, the body is in anodal utmost point ear with one side formation banding of negative pole utmost point ear, anodal utmost point ear is used for carrying out the electric conductance with the tester and leads to, its characterized in that, edge voltage test fixture includes:

the base is made of an insulating material and provided with a horizontal binding surface, and the binding surface is used for binding the horizontal plane during testing;

electrically conductive piece, install in on the base, including installation department and test section, the installation department with the pedestal connection for carry out the electric conduction with the tester, test section protrusion in outside the base, be used for with the edge of banding carries out the electric conduction.

2. The edge voltage testing jig of claim 1, wherein the base is provided with a mounting groove, the mounting groove is arranged on one side of the base, which is far away from the plane, and the mounting part is mounted in the mounting groove.

3. The edge voltage testing jig of claim 2, further comprising an elastic member connected between the side wall of the mounting groove and the conductive member.

4. The edge voltage testing jig of claim 3, further comprising a guiding member, wherein the elastic member is sleeved on the guiding member, the guiding member penetrates through the conductive member, and two ends of the guiding member are connected to the base.

5. The edge voltage testing jig of claim 1, wherein the testing portion is blade-shaped, and a length direction of the testing portion is perpendicular to the width direction of the body.

6. The edge voltage testing jig of claim 5, wherein the conductive member comprises a plurality of the testing portions, and the testing portions are spaced apart from each other along the width direction.

7. The edge voltage testing jig of claim 1, wherein an outer surface of the mounting portion is coated with an insulating material, and the mounting portion is provided with a connecting hole for connecting and electrically communicating with the tester.

8. The edge voltage testing jig of claim 1, wherein the base is provided with a waist-shaped hole, and the length direction of the waist-shaped hole is the width direction.

9. The edge voltage testing jig of claim 8, wherein the base is provided with a plurality of the kidney-shaped holes, and the kidney-shaped holes are arranged in parallel and separated from each other.