Lithium ion battery test fixture

Abstract

The utility model belongs to the technical field of lithium ion batteries, and discloses a lithium ion battery test fixture, which comprises two rigid clamping plates and two connecting assemblies, a plane where two studs are located is a central parting plane, and the two rigid clamping plates are symmetrically distributed on two sides of the central parting plane; in each connecting assembly, two connecting rings are arranged, one ends of the two connecting rings are connected to the two ends of the corresponding stud in a sleeving mode, the other end of each connecting ring is rotationally connected with one ends of two connecting rods, and the other ends of the two connecting rods are rotationally connected with the side faces of the two rigid clamping plates correspondingly. The two connecting rods are symmetrically distributed relative to the center dividing face, and the two ends of the double-end bolt are each in threaded connection with a hexagon nut. According to the utility model, the applicability of the rigid clamping plate is increased, the adjusting process is simpler, the same side of the rigid clamping plate is uniformly stressed, the test accuracy and safety are improved, the battery cell is not contacted, and the damage to the battery cell caused by improper use of the bolt is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery testing fixture. Background Art

[0002] During the performance tests of lithium-ion single cells at room temperature, high temperature, and storage, various gases will be generated due to various electrochemical reactions. At the same time, the thickness of the battery will change due to changes in the size of the electrode pieces. If the battery is tested without a splint, the contact between the internal positive and negative electrodes and the diaphragm will deteriorate, and the battery will swell and deform, which will eventually lead to abnormal battery performance tests and even safety accidents. In order to ensure the accuracy of battery testing and prevent testing accidents, single cells are often tested with a splint during performance tests at room temperature, high temperature, and storage.

[0003] In addition, during the actual use of battery modules and battery packs, the single cells will be constrained by other batteries, liquid cooling plates and end plates. In order to simulate actual use conditions, single cell tests are often conducted with clamps.

[0004] The currently used clamps are usually two rigid plates, which are fixed by multiple bolts, and the force applied to the battery cell is controlled by the bolts.

[0005] This fixture has the following problems:

[0006] (1) The position of the openings of the splints. The openings of the splints on both sides must be in the same position before they can be used. However, the openings of each batch of splints are slightly different. The splints need to be matched before each use, which makes the operation process cumbersome.

[0007] (2) The two side clamps are fixed by more than 6 bolts. The use of the clamps involves too many bolts being tightened or loosened. The whole process takes a lot of time, affecting the test efficiency.

[0008] (3) Improper use of bolts will damage the battery cells. The bolts are close to the battery cells, which will squeeze the battery cells during the test and easily cause safety accidents. In addition, several bolts are usually installed separately during the bolting process, resulting in different forces at different positions of the battery, which will lead to abnormal test results. Moreover, the unbalanced force applied by multiple bolts will cause uneven distribution of the electrolyte in the battery cells, resulting in lithium deposition inside the battery, affecting the test results and even ultimately leading to safety accidents. Utility Model Content

[0009] The utility model aims to provide a lithium ion battery testing fixture to solve the above problems existing in the prior art.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A lithium-ion battery test fixture comprises two rigid clamps and two connecting components symmetrically distributed on both sides of the two rigid clamps, the two connecting components each comprising a connecting rod, a connecting ring, a hexagonal nut and a stud bolt, the plane where the two stud bolts are located is a central dividing plane, and the two rigid clamps are symmetrically distributed on both sides of the central dividing plane;

[0012] In each connecting assembly, two connecting rings are provided, one ends of the two connecting rings are symmetrically sleeved on the two ends of the corresponding stud bolts, the other end of each connecting ring is rotatably connected to one end of two connecting rods, the other ends of the two connecting rods are rotatably connected to the side surfaces of the two rigid clamps, and the two connecting rods connected by each connecting ring are symmetrically distributed relative to the central dividing plane, and the two ends of the stud bolts are respectively threaded with a hexagonal nut to tighten the two connecting rings between them through the two hexagonal nuts.

[0013] As a preferred technical solution in the utility model, the other end of each connecting rod is rotatably connected to the side surface of the rigid clamping plate through a screw threadedly connected to the rigid clamping plate.

[0014] As a preferred technical solution in the utility model, the screw includes a screw portion and a nut portion connected to one end of the screw portion, the screw portion includes a threaded section threadedly connected to the rigid clamp and a cylindrical section connecting the threaded section and the nut portion, and a first limiting ring is provided at the other end of the connecting rod, and the first limiting ring is sleeved on the outside of the cylindrical section.

[0015] As a preferred technical solution in the utility model, the connecting ring includes a sleeve ring, a connecting rod and a limit block which are sequentially connected from one end to the other end. The sleeve ring is sleeved on the outside of the stud bolt and abuts against the corresponding hexagonal nut. The other ends of the two connecting rods connected by the connecting ring are each provided with a second limit ring. The two second limit rings are both sleeved on the connecting rod between the sleeve ring and the limit block.

[0016] Beneficial effects: The utility model does not need to punch holes on the front of the rigid clamping plate, which increases the applicability of the rigid clamping plate and eliminates the use of multiple bolts. The spacing between the two rigid clamping plates and the force applied by the clamping plates to the battery cells can be adjusted by two hexagonal nuts on both sides, making the adjustment process simpler. The rigid clamping plates are applied with force by connecting rods, and the force on the same side of the rigid clamping plates is balanced, which can prevent uneven force from affecting the test results and improve the accuracy and safety of the test. The utility model will not contact the battery cells during use, effectively preventing improper use of bolts from causing damage to the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the connecting rod in the utility model;

[0019] Figure 3 It is a structural schematic diagram of the connecting ring in the utility model.

[0020] In the figure: 1-rigid splint; 2-screw; 3-connecting rod; 4-connecting ring; 5-hexagonal nut; 6-stud bolt. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0022] Example:

[0023] like Figure 1-Figure 3 As shown, this embodiment provides a lithium-ion battery test fixture, including two rigid clamps 1 and two connecting components symmetrically distributed on both sides of the two rigid clamps 1, ensuring that the two connecting components can apply force symmetrically when applying force, thereby ensuring that the rigid clamps 1 are balanced in force, and the two connecting components each include a connecting rod 3, a connecting ring 4, a hexagonal nut 5 and a stud bolt 6, the plane where the two stud bolts 6 are located is a central dividing plane, and the two rigid clamps 1 are symmetrically distributed on both sides of the central dividing plane, so that each connecting component can unfold the structure with its own stud bolt 6 as the center;

[0024] In each connecting assembly, two connecting rings 4 are provided, and one ends of the two connecting rings 4 are symmetrically sleeved on the two ends of the corresponding stud bolts 6, so that one end of the two connecting rings 4 can move on the stud bolts 6, and the other end of each connecting ring 4 is rotatably connected to one end of two connecting rods 3, and the other ends of the two connecting rods 3 are rotatably connected to the side surfaces of the two rigid clamps 1, and the two connecting rods 3 connected by each connecting ring 4 are symmetrically distributed relative to the central dividing plane, and the two ends of the stud bolts 6 are respectively threaded with a hexagonal nut 5, which is used to tighten the two connecting rings 4 between the two through the two hexagonal nuts 5, and the actual adjustment process requires adjusting the feed of the two hexagonal nuts 5 to adjust the spacing and clamping force between the two rigid clamps 1.

[0025] The utility model eliminates the use of multiple bolts, and the distance between the two rigid clamps 1 and the force applied by the clamps to the battery cells can be adjusted through the two hexagonal nuts 5 on both sides, and the number of bolts used is reduced by at least 1 / 2; when using the utility model, the adjustment process of the rigid clamp 1 is simplified from the original clamp pairing, placing the battery cells, placing the screws, and tightening the nuts (6 pieces) to: placing the battery cells, tightening the hexagonal nuts (2 pieces), and the use efficiency is improved by at least 1 / 2.

[0026] During use, the utility model eliminates the bolts close to the battery cells, so that there will be no situation where the bolts contact the battery cells during use, effectively preventing the battery cells from being damaged by improper use of the bolts. The utility model applies force to the rigid clamping plate 1 through the connecting rod, and the rigid clamping plate 1 is evenly stressed on the same side, which can prevent uneven stress from affecting the test results and improve the test accuracy.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that the other end of each connecting rod 3 is rotatably connected to the side of the rigid clamp 1 through a screw 2 threadedly connected to the rigid clamp 1. The connection method is simple and stable, and the nut part of the screw 2 can also be used as a limiter to ensure that the other end of the connecting rod 3 is always located between the rigid clamp 1 and the nut part of the screw 2, thereby ensuring the stability of the other end of the connecting rod 3.

[0028] As a preferred implementation scheme in this embodiment, it needs to be further explained that the screw 2 includes a screw portion and a nut portion connected to one end of the screw portion, the screw portion includes a threaded section threadedly connected to the rigid clamp 1 and a cylindrical section connecting the threaded section and the nut portion, and the other end of the connecting rod 3 is provided with a first limiting ring, which is sleeved on the outside of the cylindrical section. In practice, the threaded section can be completely threadedly connected to the rigid clamp 1, and thus there will be no interference between the first limiting ring and the threaded section, and the flexibility of the first limiting ring in the cylindrical section can also be guaranteed.

[0029] As a preferred implementation scheme in this embodiment, it needs to be further explained that the connecting ring 4 includes a sleeve ring, a connecting rod and a limit block which are connected in sequence from one end to the other end. The sleeve ring is sleeved on the outside of the stud bolt 6 and abuts against the corresponding hexagonal nut 5. The other ends of the two connecting rods 3 connected by the connecting ring 4 are each provided with a second limit ring. The two second limit rings are both sleeved on the connecting rod between the sleeve ring and the limit block. The sleeve ring and the limit block limit the second limit ring on both sides to ensure that the second limit ring can be stably and flexibly rotated on the connecting rod.

[0030] It should be noted that, in practice, the connecting ring 4 can also be divided into two parts, one part is a sleeve ring, and the other part is formed integrally by a connecting rod and a limit block, combined into a second screw with a structure similar to the screw 2, and the screw is detachably connected to the sleeve ring, thereby realizing the loading and unloading of the second limit ring.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium-ion battery testing fixture, characterized in that: The invention comprises two rigid clamping plates (1) and two connecting components symmetrically distributed on both sides of the two rigid clamping plates (1), wherein the two connecting components each comprise a connecting rod (3), a connecting ring (4), a hexagonal nut (5) and a stud bolt (6), wherein the plane where the two stud bolts (6) are located is a central dividing plane, and the two rigid clamping plates (1) are symmetrically distributed on both sides of the central dividing plane; In each connection assembly, two connection rings (4) are provided, one end of the two connection rings (4) is symmetrically sleeved on the two ends of the corresponding stud bolts (6), the other end of each connection ring (4) is rotatably connected to one end of two connection rods (3), the other ends of the two connection rods (3) are rotatably connected to the side surfaces of two rigid clamping plates (1), and the two connection rods (3) connected to each connection ring (4) are symmetrically distributed relative to the central dividing plane, and the two ends of the stud bolts (6) are respectively threadedly connected with a hexagonal nut (5) for tightening the two connection rings (4) therebetween through the two hexagonal nuts (5).

2. A lithium-ion battery testing fixture according to claim 1, characterized in that: The other end of each connecting rod (3) is rotatably connected to the side surface of the rigid clamping plate (1) through a screw (2) threadedly connected to the rigid clamping plate (1).

3. A lithium-ion battery testing fixture according to claim 2, characterized in that: The screw (2) comprises a screw rod portion and a nut portion connected to one end of the screw rod portion, the screw rod portion comprises a threaded section threadedly connected to the rigid clamping plate (1) and a cylindrical section connecting the threaded section and the nut portion, and the other end of the connecting rod (3) is provided with a first limiting ring, which is sleeved outside the cylindrical section.

4. A lithium-ion battery testing fixture according to any one of claims 1 to 3, characterized in that: The connecting ring (4) comprises a sleeve ring, a connecting rod and a limit block which are sequentially connected from one end to the other end. The sleeve ring is sleeved on the outside of the stud bolt (6) and abuts against the corresponding hexagonal nut (5). The other ends of the two connecting rods (3) connected to the connecting ring (4) are each provided with a second limit ring. The two second limit rings are sleeved on the connecting rod between the sleeve ring and the limit block.

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