CN220730257U - Three-electrode cell test fixture - Google Patents

Abstract

The utility model discloses a three-electrode cell testing clamp which comprises an upper cover plate and a lower cover plate, wherein clamping structures capable of clamping lugs are respectively arranged between the upper cover plate and the lower cover plate at positions corresponding to three lugs. Therefore, through being equipped with the clamp structure between upper cover plate and lower apron, can press from both sides three utmost point ears of three electrode electricity core respectively tightly fixed, when test current voltage presss from both sides and is connected to each utmost point ear of three electrodes, because the utmost point ear is pressed from both sides the frequent dismantlement of tight outside test clamp and can not produce the pulling force to tab connection tab piece, can reach the protection tab piece reference electrode and do not destroyed the purpose.

Description

Three-electrode cell test fixture

Technical Field

The utility model relates to the technical field of battery tool clamps, in particular to a three-electrode cell testing clamp.

Background

The three-electrode cell is characterized in that a reference electrode is introduced into the normal cell for monitoring the potential changes of a working electrode and a counter electrode in the normal use process of the cell, so that the conditions of positive and negative electrode impedance changes, negative electrode lithium precipitation and the like can be independently evaluated, and the three-electrode cell is a powerful means for cell failure analysis. The cell undergoes a series of side reactions during the charge and discharge processes: for example, the increase of the thickening resistance of the SEI film stripped by the gas generating active substance is generally shown as the increase of the thickness of the battery cell, and in order to alleviate the deterioration, a clamp is used for giving a certain pretightening force to the battery cell in the actual test, so as to inhibit the expansion and the later thickness increase in the charging process of the battery cell.

The existing battery cell testing clamp is mainly characterized in that an upper cover plate and a lower cover plate are used for fixing a battery cell body through bolts, but internal lugs cannot be fixed, current and voltage clamps generate continuous pulling force on the lugs in the actual testing process, the lugs are connected with tab pieces of positive and negative electrodes and reference electrodes through frequent upper cabinet and lower cabinet tests to be broken easily, the tab pieces are connected with the positive and negative electrodes to be broken easily, the capacity of the battery cell is suddenly reduced, resistance is increased, the reference electrode is directly broken, the reference electrode is invalid, the voltage of the positive and negative electrodes cannot be monitored, and difficulty is brought to actual performance judgment and voltage monitoring of the battery cell.

Disclosure of Invention

In order to solve the technical problems in the background technology, the utility model provides a three-electrode cell testing fixture.

The utility model provides a three-electrode cell testing clamp which comprises an upper cover plate and a lower cover plate, wherein clamping structures capable of clamping lugs are respectively arranged between the upper cover plate and the lower cover plate at positions corresponding to three lugs.

Preferably, the clamping structure comprises an L-shaped protruding block arranged on the upper cover plate and an L-shaped concave block arranged on the lower cover plate, a protruding portion of the L-shaped protruding block is matched with a concave portion of the L-shaped concave block, and the tab is located between the protruding portion and the concave portion.

Preferably, the upper cover plate and the lower cover plate are of square structures with the same size.

Preferably, the upper cover plate and the lower cover plate are fixed by bolts, and bolt holes corresponding to the bolts are respectively arranged at each corner of the upper cover plate and each corner of the lower cover plate.

Preferably, the upper cover plate and the lower cover plate are made of steel plates or aluminum plates or epoxy plates or wood plates.

Preferably, the material of the L-shaped protruding block and the L-shaped concave block is rubber or silica gel.

In summary, the utility model has the following effects: through being equipped with the clamp structure between upper cover plate and the lower cover plate, can press from both sides three utmost point ears of three electrode electricity core respectively tightly fixed, when test current voltage presss from both sides to be connected to each utmost point ear of three electrode, because the utmost point ear is pressed from both sides the frequent dismantlement of tight outside test clamp and can not produce the pulling force to tab connection tab piece, can reach the protection tab piece reference electrode and not destroyed the purpose.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

FIG. 1 is a top view of a lower cover plate and a battery cell according to an embodiment of the utility model;

FIG. 2 is a top view of an embodiment of the present utility model after the upper and lower cover plates secure the battery cells;

FIG. 3 is a cross-sectional view along the x-axis of a positive tab according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view along the x-axis of a negative tab according to an embodiment of the present utility model;

fig. 5 is a cross-sectional view along the y-axis of a reference electrode tab according to an embodiment of the utility model.

In the figure:

1-upper cover plate, 2-lower cover plate, 3-L type lug, 4-L type concave block, 5-protruding part, 6-concave part, 7-bolt, 8-tab, 9-three electrode cell.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar symbols indicate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

As shown in fig. 1-5, the three-electrode battery cell testing fixture provided in this embodiment includes an upper cover plate 1 and a lower cover plate 2, and clamping structures capable of clamping the tabs 8 are respectively disposed between the upper cover plate 1 and the lower cover plate 2 at positions corresponding to the three tabs 8.

Therefore, by arranging the clamping structure between the upper cover plate 1 and the lower cover plate 2, three lugs 8 of the three-electrode cell 9 can be respectively clamped and fixed, and when the test current and voltage clamp is connected to each lug 8 of the three-electrode cell 9, the lug 8 is frequently detached by the clamping external test clamp, so that the tab 8 is not connected with a tab piece to generate pulling force, and the purpose of protecting the tab piece reference electrode from being damaged can be achieved.

Further, as shown in fig. 3-5, the clamping structure comprises an L-shaped protruding block 3 arranged on the upper cover plate 1 and an L-shaped concave block 4 arranged on the lower cover plate 2, the protruding part 5 of the L-shaped protruding block 3 is matched with the concave part 6 of the L-shaped concave block 4, the protruding part 5 faces downwards, the concave part 6 faces upwards, the protruding part 5 and the concave part 6 can be meshed, and the lug 8 is located between the protruding part 5 and the concave part 6.

Specifically, as shown in fig. 1, three clamping structures are distributed on two sides of the upper cover plate 1 and the lower cover plate 2, which are perpendicular to each other, wherein two clamping structures are distributed on one side for fixing the positive electrode lug and the negative electrode lug respectively, and one clamping structure is distributed on the other side for fixing the reference electrode lug.

Meanwhile, the L-shaped protruding block 3 and the L-shaped concave block 4 are made of rubber or silica gel, so that the lug can be clamped, a buffering effect can be achieved, and the lug is prevented from being damaged.

In this embodiment, the upper cover plate 1 and the lower cover plate 2 are provided in a square structure having the same size, the upper cover plate 1 and the lower cover plate 2 are fixed by bolts 7, and bolt holes corresponding to the bolts 7 are provided in respective corners of the upper cover plate 1 and the lower cover plate 2, respectively. The three-electrode cell 9 is arranged between the upper cover plate 1 and the lower cover plate 2, and each tab 8 is respectively arranged in the clamping structure. In this way, the L-shaped protrusion 3 and the L-shaped recess 4 can be engaged and fix the three electrode tabs placed therein when the bolts 7 are screwed. When the test current voltage clamp is connected to the tab, the tab is frequently disassembled by the clamping external test clamp, so that a pulling force is not generated on the tab connection tab, the purpose of protecting the tab reference electrode from being damaged can be achieved, and the reliability of the battery cell test result is ensured.

In this embodiment, the upper cover plate 1 and the lower cover plate 2 are made of steel plates or aluminum plates or epoxy plates or wood plates, as the case may be.

It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (5)

1. The three-electrode cell testing clamp comprises an upper cover plate and a lower cover plate, and is characterized in that clamping structures capable of clamping the lugs are respectively arranged between the upper cover plate and the lower cover plate at positions corresponding to the three lugs; the clamping structure comprises an L-shaped protruding block arranged on the upper cover plate and an L-shaped concave block arranged on the lower cover plate, the protruding portion of the L-shaped protruding block is matched with the concave portion of the L-shaped concave block, and the lug is located between the protruding portion and the concave portion.

2. The three-electrode cell testing fixture of claim 1, wherein the upper cover plate and the lower cover plate are of square structures with the same size.

3. The three-electrode cell testing fixture according to claim 2, wherein the upper cover plate and the lower cover plate are fixed by bolts, and each corner on the upper cover plate and the lower cover plate is respectively provided with a bolt hole corresponding to the bolt.

4. The three-electrode cell testing fixture of claim 1, wherein the upper cover plate and the lower cover plate are made of steel plates or aluminum plates or epoxy plates or wood plates.

5. The three-electrode cell testing fixture of claim 1, wherein the L-shaped bumps and the L-shaped concave blocks are made of rubber or silica gel.