CN211697879U

CN211697879U - Button cell fixture and battery testing arrangement

Info

Publication number: CN211697879U
Application number: CN201922212314.9U
Authority: CN
Inventors: 史碧梦; 杨娟玉; 史冬; 余章龙; 方升; 张莹; 罗茜
Original assignee: China Automotive Battery Research Institute Co Ltd
Current assignee: China Automotive Battery Research Institute Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-10-16
Anticipated expiration: 2029-12-11

Abstract

The utility model relates to a lithium ion battery field discloses a button cell fixture and battery testing arrangement. Button cell fixture includes: the button cell comprises a first cover body and a second cover body, wherein a battery jar for accommodating the button cell is constructed in the first cover body, the first cover body and the second cover body are oppositely buckled and arranged and are detachably connected through a fastener, the clamping function of the button cell with various thickness specifications is provided, the consequence that the cell is lost due to too large clamping force or the cell is fallen due to too small clamping force is avoided, and the residual electrolyte is easy to clean. The battery testing device includes: the first conducting electrode, the second conducting electrode and the button cell clamping mechanism avoid the hidden trouble of contact disconnection of the first conducting electrode and the second conducting electrode. The utility model discloses a battery test device simple structure, convenient operation, the security is high, measures accurately.

Description

Button cell fixture and battery testing arrangement

Technical Field

The utility model relates to a lithium ion battery field especially relates to a button cell fixture and battery testing arrangement.

Background

The lithium ion battery has the remarkable advantages of high charging efficiency, long service life and the like, and is widely applied to the fields of electronic products and the like. In the research and development of lithium ion battery materials, the batteries are generally prepared into button half batteries (models are CR2032, CR2025 and the like), electrochemical performance characterization is carried out on the button half batteries, and the performance of the materials is analyzed and evaluated.

The existing common test equipment provides test joints which are all crocodile clamps or clamps similar to the crocodile clamps, and has certain defects. The structure of the lithium battery clamp is similar to that of a crocodile clip type device, the lithium battery clamp is a device which is universal on the existing test equipment, and the lithium battery clamp comprises an upper clamp plate, a clamp spring, an upper support, an upper contact plate, an upper sepal, a lower contact plate, a lower support, a movable shaft and a lower clamp plate, wherein the upper support is arranged on the upper clamp plate, the lower support is arranged on the lower clamp plate, the upper support and the lower support are connected through the movable shaft, the clamp spring is nested on the movable shaft and arranged between the upper clamp plate and the lower clamp plate, the upper contact plate is arranged at the front end of the upper clamp plate, the lower contact plate is arranged at the front end of the lower clamp plate, the upper contact plate is matched with the lower contact plate, the upper sepal is arranged at the front end of the upper contact plate, the lower sepal is. This device has 2 problems: firstly, the clamping degree is not controllable, the clamping force given by the clamp springs on the batteries with different thicknesses is different, so that the test result is possibly influenced, the battery with serious gas production is also likely to burst and fly from the clamp, and potential safety hazards are caused; secondly, the raised grains on the surface of the clamp insulation sheet increase the friction coefficient to prevent the battery from slipping, but the residual electrolyte on the surface of the battery is likely to be accumulated in the raised grains and is difficult to clean, so that the contact of the battery is poor, and the test result is influenced. In addition, the cathode posts of the clamp are on the same side, and the potential of contacting a conductive medium exists when the clamp is inclined, so that the potential short circuit hazard exists.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The embodiment of the utility model provides a button cell fixture and battery testing arrangement to solve the inaccurate and potential safety hazard's of test result that alligator clip formula device exists among the prior art technical problem.

(II) technical scheme

In order to solve the technical problem, the embodiment of the utility model provides a button cell fixture, include: the button battery cover comprises a first cover body and a second cover body, wherein a battery jar for containing a button battery is constructed in the first cover body, and the first cover body and the second cover body are oppositely buckled and arranged and are detachably connected through a fastener.

The elastic piece is arranged between the first cover body and the second cover body.

The fastener comprises a screw and a nut, the screw is arranged along the axial direction of the first cover body, part of the screw protrudes out of the surface of the first cover body and faces the second cover body, the second cover body is provided with a positioning through hole matched with the screw, and the screw penetrates through the positioning through hole and then is connected with the nut in a meshed mode.

The elastic piece is a spring, the spring is sleeved on the outer peripheral side of the screw rod, one end of the spring is fixed to the first cover body, and the other end of the spring faces the second cover body.

The number of the screw rods is at least two, and the screw rods are symmetrically arranged along the center of the first cover body.

The screw rod is provided with a plane along the axial direction, and scales are marked on the plane along the axial direction.

Wherein, the depth of the battery jar ranges from 15 microns to 25 microns, and the diameter ranges from 20 microns to 30 microns.

The embodiment of the utility model provides a still disclose a battery testing arrangement, include: first conducting electrode, second conducting electrode and if the utility model discloses button cell fixture, first conducting electrode runs through first lid, and stretch into inside the battery jar, the second conducting electrode runs through the second lid, and the orientation inside the battery jar.

The first cover body and the second cover body are both insulating cover bodies.

(III) advantageous effects

The embodiment of the utility model provides a pair of button cell fixture and battery testing arrangement. The clamping mechanism can fix the button cell in the cell tank through buckling the first cover body and the second cover body, and adjust the distance between the first cover body and the second cover body through the fastener, so that the clamping function of the button cell with various thickness specifications is provided, and the consequence that the cell fails due to overlarge clamping force or falls off due to undersize clamping force is avoided; the first cover body, the battery jar and the second cover body are planes, and residual electrolyte is easy to clean. This battery testing arrangement is connected with first conducting electrode through outside test equipment's positive pole, and test equipment's negative pole is connected with the second conducting electrode, tests in button cell's positive and negative both sides, has avoided the hidden danger of first conducting electrode and second conducting electrode contact open circuit. The utility model discloses a battery test device simple structure, convenient operation, the security is high, measures accurately.

Drawings

Fig. 1 is a schematic structural diagram of a battery testing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first cover body according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a second cover body according to an embodiment of the present invention;

fig. 4 is a schematic structural view of the screw rod according to the embodiment of the present invention.

Reference numerals:

1: a screw; 2: a nut; 31: a first conductive electrode; 32: a second conductive electrode; 4: a battery case; 5: a first cover body; 6: a second cover body; 7: positioning the through hole; 8: a spring; 9: and (4) calibration.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, the embodiment of the utility model discloses a button cell fixture, include: the button cell comprises a first cover body 5 and a second cover body 6, wherein a cell slot 4 for accommodating a button cell is formed in the first cover body 5, and the first cover body 5 and the second cover body 6 are oppositely buckled and arranged and are detachably connected through a fastener.

Specifically, the first cover 5 and the second cover 6 are both cylindrical in shape, the battery container 4 is hollow and is shaped as a cylindrical container, and the fastening members may be various threaded fastening members or other types of fastening members. Put into the battery jar 4 of first lid 5 with button cell in, with second lid 6 lock on first lid 5 to fix first lid 5 and second lid 6 through the fastener, the distance between first lid 5 and the second lid 6 is adjusted to the accessible fastener, with the button cell of adaptation different thickness specifications, avoids leading to the battery to become invalid or the result that the clamping-force undersize leads to the battery to drop because of the clamping-force is too big. And because the fastening effect of fastener, in the test process, the inflation of reducible battery thickness direction, even final flatulence fracture also can not break away from this clamping structure, reduced the potential safety hazard.

Further, in this embodiment, since no texture is required to increase the friction force, the surfaces of the first cover 5, the battery jar 4, and the second cover 6 are all flat, which is beneficial to wiping and cleaning.

The embodiment of the utility model provides a pair of button cell fixture. The clamping mechanism can accommodate the button cell in the cell tank 4 through the buckling arrangement of the first cover body 5 and the second cover body 6, and adjust the distance between the first cover body 5 and the second cover body 6 through the fastener, so as to provide the clamping function of the button cell with various thickness specifications, and avoid the consequence that the cell fails due to overlarge clamping force or falls off due to undersize clamping force; the first cover 5, the battery container 4 and the second cover 6 are flat surfaces, and the residual electrolyte is easy to clean.

The elastic piece is arranged between the first cover body 5 and the second cover body 6. In the embodiment, the elastic piece is arranged between the first cover body 5 and the second cover body 6, so that the force generated by the expansion of the button cell can be judged according to the length change of the elastic piece. Specifically, if the force generated by the expansion of the battery needs to be measured, the button battery is firstly placed in the battery jar 4, the first cover body 5 and the second cover body 6 are fastened (the fastening is not performed by using a fastener or the fastener is performed without providing an axial fastening force, i.e. the nut 2 is not screwed in or the nut 2 is screwed in but not screwed in the corresponding embodiment, and the nut 2 does not provide an axial fastening force in the circulation process), and the bottom surface of the button battery is pressed against the first cover body 5 through the battery jar 4, and the top surface of the button battery is pressed against the second cover body 6, and the button battery is in a natural state; when a charge-discharge cycle test or a thermodynamics test and the like are carried out, the battery expands, the top surface of the button battery jacks up the second cover body 6, and the expansion force of the button battery in the process can be calculated according to hooke's law according to the extending distance of the elastic part. The elastic member in this embodiment may employ various types of coil springs or other elastic members.

The fastener comprises a screw rod 1 and a nut 2, the screw rod 1 is arranged along the axial direction of the first cover body 5, part of the screw rod 1 protrudes out of the surface of the first cover body 5 and faces the second cover body 6, the second cover body 6 is provided with a positioning through hole 7 matched with the screw rod 1, and the screw rod 1 penetrates through the positioning through hole 7 and then is meshed with the nut 2. In this embodiment, the screw 1 and the nut 2 are used as fastening members to detachably connect the first cover 5 and the second cover 6. Specifically, the positioning through hole 7 in this embodiment is not a threaded hole, and is located opposite to the position of the screw rod 1, and the diameter of the positioning through hole 7 is slightly larger than the outer diameter of the screw rod 1, so that the screw rod 1 can smoothly pass through the positioning through hole 7.

Further, the elastic element is a spring 8, the spring 8 is sleeved on the outer periphery of the screw rod 1, one end of the spring 8 is fixed on the first cover body 5, and the other end faces the second cover body 6. Specifically, the diameter of the spring 8 in this embodiment is larger than the diameter of the positioning through hole 7, so that when the screw 1 passes through the positioning through hole 7, the spring 8 cannot pass through the positioning through hole 7, and the spring 8 abuts against the space between the first cover 5 and the second cover 6.

Further, the number of the screws 1 is at least two, and the screws 1 are arranged along the center of the first cover body 5 in a symmetrical manner. It can be understood that the number of the positioning through holes 7 is the same as that of the screws 1, and the positioning through holes are arranged along the center of the second cover body 6 symmetrically, so that the nut 2 can be rotated by using a wrench in the embodiment to ensure uniform pressurization, thereby ensuring uniform stress of the battery and avoiding virtual connection. As shown in fig. 1 to 3, the present embodiment may adopt a mode of symmetrically arranging two screws 1 and two positioning through holes 7.

The screw 1 is axially formed with a plane, and the plane is axially marked with a scale 9. As shown in fig. 4, according to the above embodiment, since the spring 8 is fitted around the outer circumferential side of the screw 1, in the present embodiment, the amount of deformation of the spring 8 can be observed by using the screw 1 having the scale 9, thereby facilitating calculation of the battery expansion force by hooke's law. Specifically, the scale 9 on the screw 1 is marked starting from the surface of the first cover 5 with a "0" scale or other integer scale. Through observing scale 9 on the screw rod 1, can obtain the length of nut 2 screw in screw rod 1, can guarantee when utilizing spanner swivel nut 2, the clamping-force that the battery of different thickness specifications received when the test is the same, guarantees that test condition is unanimous, reduces experimental error.

Wherein, the depth of the battery groove 4 ranges from 15 micrometers to 25 micrometers, and is preferably 20 micrometers; the diameter ranges from 20 microns to 30 microns, preferably 25 microns. The battery jar 4 of this kind of size is applicable in most button cell, according to actual need, can design the battery jar 4 of arbitrary degree of depth and diameter size, guarantees to accord with the size of actual button cell.

The utility model also discloses a battery testing arrangement, include: the button cell clamping mechanism comprises a first conductive electrode 31, a second conductive electrode 32 and the button cell clamping mechanism as in the above embodiment, wherein the first conductive electrode 31 penetrates through the first cover body 5 and extends into the cell slot 4, and the second conductive electrode 32 penetrates through the second cover body 6 and faces the cell slot 4.

Specifically, the first conductive electrode 31 and the second conductive electrode 32 in the present embodiment are both made of a conductive material, preferably copper. One end of the first conductive electrode 31 extends into the battery jar 4 to be in contact with the positive electrode (or the negative electrode) of the button battery, the other end of the first conductive electrode is connected with the positive electrode (or the negative electrode) of the testing equipment, one end of the second conductive electrode 32 is in contact with the negative electrode (or the positive electrode) of the button battery, and the other end of the second conductive electrode is connected with the negative electrode (or the positive electrode) of the testing equipment. The first conductive electrode 31 and the second conductive electrode 32 in this embodiment may be columnar, preferably rectangular, and are conveniently clamped and fixed by a positive electrode (or negative electrode) alligator clamp (or other clamps), so that various tests can be performed.

Furthermore, the end faces of the first conductive electrode 31 and the second conductive electrode 32 are both flat, so that residual lithium salt in the electrolyte can be conveniently cleaned, and the test error can be reduced. The end face sizes of the first conductive electrode 31 and the second conductive electrode 32 are smaller than the diameter of the battery, so that the battery can be prevented from separating from a conductive area to cause virtual connection, and the test error is reduced. The end faces of the first and second

conductive electrodes

31 and 32 are flat, and the battery is not damaged during the pressurization process within a range not exceeding the pressure.

The utility model discloses a battery testing device, positive pole through outside test equipment is connected with first conducting electrode 31, and test equipment's negative pole is connected with second conducting electrode 32, tests in button cell's positive, reverse both sides, has avoided the hidden danger of first conducting electrode 31 and second conducting electrode 32 contact open circuit. The utility model discloses a battery test device simple structure, convenient operation, the security is high, measures accurately.

Wherein, first lid 5 and second lid 6 are insulating lids, preferably organic glass apron, avoid influencing the test result because first lid 5 and second lid 6 are electrically conductive in the test process.

The following tests were performed based on the battery test apparatus of the above embodiment:

1. a lithium ion button cell is assembled and respectively tested on 8 channels of a blue test system, and the open circuit voltages are respectively 2.958V (volt, hereinafter referred to as V), 2.886V, 3.011V, 2.965V, 2.899V, 3.157V, 3.002V and 2.955V. The battery is placed in a battery jar 4 of a first cover body 5, a spring 8 is sleeved on a screw rod 1, the screw rod 1 penetrates out of a positioning through hole 7, the first cover body 5 and a second cover body 6 are fixed by matching and fastening a nut 2 and the screw rod 1, the nut 2 is screwed by a torque wrench, the spring 8 is compressed, the torque of the two nuts 2 is adjusted to be consistent, and the button battery is respectively in close contact with a first conductive electrode 31 and a second conductive electrode 32 on the front side and the back side. The positive and negative alligator clips of the blue test system are respectively clamped on the first conductive electrode 31 and the second conductive electrode 32 of the corresponding electrode side, and the open-circuit voltages of the battery are respectively 2.964V, 2.905V, 2.974V, 2.955V, 2.932V, 2.977V, 2.958V and 2.960V.

2. The lithium ion button batteries with different thicknesses are assembled, the batteries are placed in the battery grooves 4 of the first cover body 5 respectively, the spring 8 is sleeved on the screw rod 1, the screw rod 1 penetrates out of the positioning through hole 7, the first cover body 5 and the second cover body 6 are fixed by matching and fastening the nut 2 and the screw rod 1, the nut 2 is screwed by using a torque wrench, the spring 8 is compressed, the torque of the two nuts 2 is adjusted to be consistent, the torque of the nut 2 of each battery is adjusted to be consistent, the button batteries are respectively in close contact with the first conductive electrode 31 and the second conductive electrode 32 on the front side and the back side, the external forces of the button batteries with different thicknesses are consistent, and experimental errors are reduced. And after circulation, the battery is fixed in the testing device, so that potential safety hazards are reduced.

3. And the packaging pressure of each battery is consistent when the lithium ion button battery prepared by different electrode materials is assembled. The material a cell (without the cell test apparatus of this example) had a thickness of 32.5mm before cycling (data below are averaged 3 times using a digital micrometer), 32.5mm after 5 cycles, 32.8mm after 10 cycles, 32.9mm after 20 cycles, and 33.0mm after 30 cycles. The thickness of the material a battery before cycling was 32.6mm, and the thickness after cycling for 30 weeks using the battery testing apparatus of this example was 32.6 mm. The thickness of the material B battery (without using the battery test apparatus of this example) was 32.1mm before the cycle, 32.4mm after the cycle of 5 weeks, 32.5mm after the cycle of 10 weeks, 32.6mm after the cycle of 20 weeks, and 32.8mm after the cycle of 30 weeks. The thickness of the material B battery before cycle was 32.2mm, and the thickness of the material B battery after 30 cycles using the battery test apparatus of this example was 32.2 mm. Therefore, the battery testing device of the embodiment can effectively avoid the expansion of the lithium ion button battery in the circulation process.

4. The lithium ion button cell is assembled, the cell is placed in the cell slot 4 of the first cover body 5, the spring 8 is sleeved on the screw rod 1, the screw rod 1 penetrates out of the positioning through hole 7, the first cover body 5 and the second cover body 6 are buckled and arranged (the fastener is not used for fastening or the fastener is used but axial fastening force is not provided, namely, the nut 2 is not screwed or the nut 2 is screwed but not screwed in the embodiment, and the nut 2 does not provide axial fastening force in the circulation process), and the bottom surface of the button cell is enabled to be propped against the first cover body 5 through the cell slot 4, the top surface is propped against the second cover body 6, and the natural state is realized at the moment. The button cell is in close contact with the first conductive electrode 31 and the second conductive electrode 32 on the front side and the back side. The battery is circulated in the testing device, if the battery is expanded violently in the circulation process, the spring 8 pushes the second cover body 6 to move upwards, and the expansion degree of the battery can be observed according to the change of scale indication numbers of the second cover body 6 on the screw rod 1. Further, the force generated by the expansion of the battery can be estimated by the amount of change in the elongation of the spring 8 according to hooke's law.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a button cell fixture which characterized in that includes: the button battery cover comprises a first cover body and a second cover body, wherein a battery jar for containing a button battery is constructed in the first cover body, and the first cover body and the second cover body are oppositely buckled and arranged and are detachably connected through a fastener.

2. The button cell clamping mechanism according to claim 1, further comprising an elastic member disposed between the first cover and the second cover.

3. The button cell clamping mechanism according to claim 2, wherein the fastening member comprises a screw rod and a nut, the screw rod is arranged along the axial direction of the first cover body, part of the screw rod protrudes out of the surface of the first cover body and faces the second cover body, the second cover body is provided with a positioning through hole matched with the screw rod, and the screw rod is meshed with the nut after passing through the positioning through hole.

4. The button cell clamping mechanism according to claim 3, wherein the elastic member is a spring, the spring is sleeved on the outer periphery of the screw, one end of the spring is fixed to the first cover, and the other end of the spring faces the second cover.

5. The button cell clamping mechanism according to claim 3, wherein the number of the screws is at least two, and the screws are symmetrically arranged along the center of the first cover.

6. Button cell clamping mechanism according to claim 4, characterized in that the screw is configured with a plane in the axial direction and on the plane a scale is marked in the axial direction.

7. The button cell holder according to any one of claims 1 to 6, wherein the depth of the cell well ranges from 15 microns to 25 microns and the diameter ranges from 20 microns to 30 microns.

8. A battery testing apparatus, comprising: the button cell clamping mechanism comprises a first conductive electrode, a second conductive electrode and the button cell clamping mechanism as claimed in any one of claims 1 to 7, wherein the first conductive electrode penetrates through the first cover body and extends into the cell groove, and the second conductive electrode penetrates through the second cover body and faces the cell groove.

9. The battery testing device of claim 8, wherein the first cover and the second cover are both insulating covers.