Universal fixing clamp for acupuncture test of lithium battery

Abstract

The utility model relates to a universal fixing clamp for a lithium battery acupuncture test. The universal fixing clamp comprises a bottom plate, a movable plate, a top plate, a connecting rod and a locking assembly, the bottom plate, the movable plate and the top plate are sequentially arranged in the axis direction of the connecting rod. The two ends of the connecting rod are fixedly arranged on the bottom plate and the top plate respectively. Locking assemblies are arranged at the two ends of the top plate, the movable plate is in sliding fit with the connecting rods through the locking assemblies and can move up and down in the axial direction of the locking assemblies, insertion holes are formed in the bottom plate, through holes corresponding to the insertion holes are formed in the movable plate and the top plate, and the three holes are coaxially formed and communicated; the clamping surfaces of the bottom plate and the movable plate are respectively provided with a lower positioning groove and an upper positioning groove which are used for positioning a battery, and the bottom plate and the movable plate are used for clamping and placing the lithium battery. The device is simple in structure, time-saving, efficient, safe and convenient; the device is simple in structure and convenient to use, can realize the acupuncture test of a cylindrical battery after being fixed, can also realize the acupuncture test of a soft package battery and a prismatic battery after being fixed, and is good in universality, wide in application range and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing, in particular to a universal fixing fixture for lithium battery puncture testing. Background Art

[0002] With the widespread application of lithium-ion batteries in daily life, industrial production and other fields, their safety has received more and more attention. Safety performance is also a bottleneck restricting the development of lithium-ion batteries towards high energy, high power and large-scale. In order to evaluate the safety performance of lithium-ion batteries under internal short circuit conditions, the commonly used test method is to use a metal needle to pierce the inside of the battery to observe whether the battery has thermal runaway behaviors such as fire and explosion. Generally, steel needles with different diameters are used to penetrate the battery at a certain rate to observe whether the battery has fire, explosion and other phenomena.

[0003] After the battery is penetrated during the needle puncture test, the battery temperature rises, the shell swells and deforms, and the friction between the lithium battery and the steel needle increases. Due to the influence of friction, the lithium battery is easily lifted up when the needle is pulled out. The steel needle and the lithium battery are not separated. After each test is completed, they need to be separated manually. In this case, it takes a lot of time and there are safety hazards. Summary of the invention

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a universal fixing fixture for lithium battery puncture testing to solve the problems of time-consuming and potential safety hazards. It has the advantages of time-saving and high efficiency, safety and convenience, good versatility, wide application range and good stability.

[0005] The purpose of the utility model is achieved in this way:

[0006] A universal fixing fixture for lithium battery needle puncture test, comprising a bottom plate, a movable plate, a top plate, a connecting rod and a locking assembly, wherein the bottom plate, the movable plate and the top plate are arranged in parallel from bottom to top, the bottom plate and the top plate are connected by a connecting rod, and the movable plate is slidably sleeved on the connecting rod; a locking assembly is symmetrically provided on the left and right sides of the movable plate, respectively, and the locking assembly comprises a screw rod, the movable plate is sleeved on the screw rod and can move up and down along the axial direction of the screw rod, and the bottom plate and the movable plate are used to clamp and place the lithium battery;

[0007] A lower positioning groove is provided at the radial center axis of the upper surface of the base plate, and an upper positioning groove is provided at the radial center axis of the lower surface of the movable plate, and the upper positioning groove is arranged opposite to the lower positioning groove; an insertion hole is provided on the lower positioning groove of the base plate, and the insertion hole is arranged at the center of the base plate; a through hole is respectively provided at the center of the movable plate and the top plate, and the through hole is coaxially arranged with the insertion hole, and the axis coincides with the axis of the test steel needle.

[0008] Furthermore, four connecting rods are arranged between the bottom plate and the top plate, the top ends of the connecting rods are arranged at the corners of the top plate, and the bottom ends of the connecting rods are arranged at the corners of the bottom plate; and the four corners of the movable plate are slidably sleeved on the connecting rods.

[0009] Furthermore, the top end of the screw rod is connected to a screw wrench, and the screw wrench is arranged on the top plate, and the screw wrench facilitates the adjustment of the locking assembly.

[0010] Furthermore, the upper positioning groove and the lower positioning groove are both V-shaped grooves.

[0011] Furthermore, a plurality of pressure relief holes are provided on the movable plate.

[0012] Furthermore, the pressure relief holes are evenly arranged in an array on the movable plate and are symmetrically arranged along the axis of the through hole.

[0013] Furthermore, the diameters of the through holes on the movable plate and the top plate are larger than the insertion holes on the bottom plate, which facilitates the needle removal work after the acupuncture test is completed.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model provides a universal fixing fixture for lithium battery needle penetration test, which clamps the battery to be tested between a movable movable plate and a bottom plate, and the test steel needle passes through a through hole, which is convenient for needle removal; the utility model has a simple structure, saves time and is efficient, safe and convenient; it can realize the needle penetration test of cylindrical batteries after fixation, and can also realize the needle penetration test of soft-pack batteries and prismatic batteries after fixation, and has the characteristics of good versatility, wide application range and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the utility model from another angle.

[0018] in:

[0019] Bottom plate 1, insertion hole 101, lower positioning groove 102, movable plate 2, upper positioning groove 201, pressure relief hole 202, top plate 3, connecting rod 4, locking assembly 5, screw 501, screw wrench 502, through hole 6. DETAILED DESCRIPTION

[0020] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0021] See also Figure 1-Figure 2 , Figure 1 The structural schematic diagram of the utility model is drawn. As shown in the figure, the utility model relates to a universal fixing fixture for lithium battery needle puncture test, which includes a bottom plate 1, a movable plate 2, a top plate 3, a connecting rod 4 and a locking assembly 5. The bottom plate 1, the movable plate 2 and the top plate 3 are arranged in parallel from bottom to top, and the bottom plate 1, the movable plate 2 and the top plate 3 can be rectangular plates of the same size. Four connecting rods 4 are arranged between the bottom plate 1 and the top plate 3, and the top ends of the connecting rods 4 are arranged at the corners of the top plate 3, and the bottom ends of the connecting rods 4 are arranged at the corners of the bottom plate 1; the four corners of the movable plate 2 are slidably sleeved on the connecting rods 4.

[0022] A locking assembly 5 is symmetrically provided on the left and right sides of the movable plate 2, and the locking assembly 5 includes a screw 501 and a screw wrench 502. The movable plate 2 is sleeved on the screw 501, and the top of the screw 501 is connected to the screw wrench 502, which is arranged on the top plate 3, and the screw wrench 502 is convenient for adjusting the locking assembly 5. The movable plate 2 moves up and down along the axial direction of the screw 501 through the sliding cooperation between the locking assembly 5 and the connecting rod 4, and the bottom plate 1 and the movable plate 2 are used to clamp and place lithium batteries.

[0023] A lower positioning groove 102 is provided at the radial center axis of the upper surface of the bottom plate 1, and an upper positioning groove 201 is provided at the radial center axis of the lower surface of the movable plate 2. The upper positioning groove 201 is arranged opposite to the lower positioning groove 102 to fix the cylindrical battery.

[0024] The upper positioning groove 201 and the lower positioning groove 102 are both V-shaped grooves.

[0025] An insertion hole 101 is provided on the lower positioning groove 102 of the bottom plate 1, and the insertion hole 101 is arranged at the center of the bottom plate 1; a through hole 6 is respectively provided at the center of the movable plate 2 and the top plate 3, and the through hole 6 is coaxially arranged with the insertion hole 101, and the axis coincides with the axis of the test steel needle.

[0026] The diameter of the through holes 6 on the movable plate 2 and the top plate 3 is larger than the insertion hole 101 on the bottom plate 1 , which facilitates the needle removal work after the acupuncture test is completed.

[0027] The movable plate 2 is provided with a plurality of pressure relief holes 202, which are evenly arranged in an array on the movable plate 2 and symmetrically arranged along the axis of the through hole 6. The pressure relief holes 202 can be circular through holes. When the steel needle penetrates the battery, the battery short-circuit generates heat, the electrolyte vaporizes, and the battery expands, accelerating the battery short-circuit and causing explosion and fire. When an explosion occurs, the pressure can be relieved through the pressure relief holes 202 to prevent dangerous accidents.

[0028] The two screw rods 501 are symmetrically arranged on both sides of the axis of the through hole 6 , and the screw rod 501 is arranged between the two connecting rods 4 on one side of the through hole 6 .

[0029] Working principle:

[0030] The utility model provides a universal fixing fixture for lithium battery puncture test. When the lithium battery is fixed and punctured, the sample to be tested is placed between the bottom plate 1 and the movable plate 2 and fixed and locked to conduct the test. Cylindrical batteries, soft-pack batteries and prismatic batteries can all be tested. Among them, for cylindrical batteries, after being placed, they are fixed and locked by the lower positioning groove 102 and the upper positioning groove 201. After the lower positioning groove 102 and the upper positioning groove 201 are fixed and locked, the center of the cylindrical battery can naturally be located at the puncture center; for soft-pack batteries and prismatic batteries, the position can be adjusted arbitrarily, and they can be directly placed between the bottom plate 1 and the movable plate 2 and fixed and locked to conduct the test.

[0031] The position of the movable plate 2 is adjusted by the locking assembly 5, so as to clamp and fix the lithium battery to be tested.

[0032] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A universal fixing fixture for lithium battery puncture test, characterized by: It comprises a bottom plate (1), a movable plate (2), a top plate (3), a connecting rod (4) and a locking assembly (5), wherein the bottom plate (1), the movable plate (2) and the top plate (3) are arranged in parallel from bottom to top, the bottom plate (1) and the top plate (3) are connected via a connecting rod (4), and the movable plate (2) is slidably sleeved on the connecting rod (4); a locking assembly (5) is symmetrically provided on the left and right sides of the movable plate (2), respectively, and the locking assembly (5) comprises a screw rod (501), the movable plate (2) is sleeved on the screw rod (501) and can move up and down along the axial direction of the screw rod (501), and the bottom plate (1) and the movable plate (2) are used for clamping and placing lithium batteries; A lower positioning groove (102) is provided at the radial center axis of the upper surface of the bottom plate (1), and an upper positioning groove (201) is provided at the radial center axis of the lower surface of the movable plate (2), and the upper positioning groove (201) and the lower positioning groove (102) are arranged opposite to each other; an insertion hole (101) is provided on the lower positioning groove (102) of the bottom plate (1), and the insertion hole (101) is arranged at the center of the bottom plate (1); a through hole (6) is provided at the center of each of the movable plate (2) and the top plate (3), and the through hole (6) and the insertion hole (101) are arranged coaxially, and the axis coincides with the axis of the test steel needle.

2. A universal fixing fixture for lithium battery puncture test according to claim 1, characterized in that: Four connecting rods (4) are provided between the bottom plate (1) and the top plate (3); the top ends of the connecting rods (4) are arranged at the corners of the top plate (3), and the bottom ends of the connecting rods (4) are arranged at the corners of the bottom plate (1); and the four corners of the movable plate (2) are slidably sleeved on the connecting rods (4).

3. A universal fixing fixture for lithium battery puncture test according to claim 1, characterized in that: The top end of the screw rod (501) is connected to a screw wrench (502), and the screw wrench (502) is arranged on the top plate (3). The screw wrench (502) facilitates the adjustment of the locking assembly (5).

4. A universal fixing fixture for lithium battery puncture test according to claim 1, characterized in that: The upper positioning groove (201) and the lower positioning groove (102) are both V-shaped grooves.

5. A universal fixing fixture for lithium battery puncture test according to claim 1, characterized in that: The movable plate (2) is provided with a plurality of pressure relief holes (202).

6. A universal fixing fixture for lithium battery puncture test according to claim 5, characterized in that: The pressure relief holes (202) are evenly arranged in an array on the movable plate (2), and are symmetrically arranged along the axis of the through hole (6).

7. A universal fixing fixture for lithium battery puncture test according to claim 1, characterized in that: The diameter of the through holes (6) on the movable plate (2) and the top plate (3) is larger than the insertion hole (101) on the bottom plate (1), so as to facilitate the needle removal work after the acupuncture test is completed.

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