Battery cell detection equipment of lithium battery

Abstract

The utility model relates to battery cell detection equipment of a lithium battery. The device comprises a bottom plate and a battery tool, and the battery tool comprises a first clamping plate, a second clamping plate, a plurality of connecting rods fixedly connected between the two clamping plates, a battery clamp set connected to the connecting rods in a sliding mode and an ejector rod connected to the first clamping plate in a screwed mode. The battery clamp set is composed of two one-way clamps located at the two ends, a plurality of two-way clamps located in the middle and a plurality of springs connected between any two adjacent clamps, and a clamping cavity is formed between every two adjacent clamping grooves. According to the utility model, the clamping state of the battery clamp group is controlled through the ejector rod, the lithium battery can be mounted or taken out when the clamping cavity on the battery clamp group is in an expansion state, the battery tool is turned over by 90 degrees when the clamping cavity is tightened, so that the lithium battery is in a horizontal placement state, and then whether liquid leakage exists on two sides of the lithium battery or not is observed after a period of time. Therefore, the liquid leakage detection device can be used for detecting the liquid leakage of the battery cells of the cylindrical lithium batteries in small batches.

Description

Technical Field

[0001] The utility model relates to a lithium battery detection device, in particular to a lithium battery cell detection device. Background Art

[0002] In the new energy pure electric vehicle power battery industry, lithium battery packs are generally used to power electric vehicles, and lithium battery packs are composed of several battery cells connected in series. The battery cell area is often leaked due to the consistency of the welding process on the shell, and the battery cell leakage problem has always been difficult to detect and inefficient.

[0003] A Chinese patent (CN216012599U) named "Lithium Battery Cell Leakage Detection Device" is now disclosed. It includes spaced-apart clamps and a connecting rod connected between the clamps. The battery cell is placed between the two clamps. The relative positions of the two clamps are adjusted to clamp and fix the battery cell. The upper edge of the clamp is higher than the upper position of the battery cell. Then, by applying a clamping force to the battery cell, observe whether there is leakage in the welding area of ​​the battery cell. The battery cell leakage detection device has a simple structure, low cost, and is easy to use. It is suitable for leakage detection of a small amount of battery cells and has strong practicality and good application prospects. However, the device is only applicable to square lithium batteries and is not applicable to cylindrical lithium batteries. Therefore, it is necessary to develop a battery cell leakage detection device suitable for cylindrical lithium batteries. Summary of the invention

[0004] The utility model provides a lithium battery core detection device, which solves the problem in the prior art that a core leakage detection device cannot be used to detect leakage of a cylindrical lithium battery.

[0005] The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: a lithium battery cell detection device, characterized in that: it includes a bottom plate and a battery tooling, the battery tooling includes a first clamping plate, a second clamping plate, a plurality of connecting rods fixedly connected between the two clamping plates, a battery clamp group slidably connected to the connecting rods and a top rod screwed on the first clamping plate, the battery clamp group is composed of two unidirectional clamps located at both ends, a plurality of bidirectional clamps located in the middle and a plurality of springs connected between any two adjacent clamps, an arc-shaped clamping groove is provided on the inner side of the unidirectional clamp, a clamping groove is provided on each side of the bidirectional clamp, and a clamping cavity is formed between two adjacent clamping grooves; by rotating the top rod so that its end continuously pushes the unidirectional clamp to move to one side, all clamping cavities can be tightened synchronously.

[0006] The detection method of the utility model is: the battery tooling is placed vertically on the bottom plate so that the clamping cavity is vertically distributed. At this time, the clamping cavity is in an expanded state, so the worker can easily put the cylindrical lithium battery to be tested into all the clamping cavities in turn, the bottom end of the battery is in contact with the bottom plate, and then start to tighten the push rod. In practice, a torque wrench is generally used to operate. The push rod will slowly push the one-way clamp to move to the side of the second clamping plate, so that all the clamping cavities will begin to tighten and compress the spring until it rotates to a predetermined torque value. At this time, the clamping force generated by the clamping cavity on the lithium battery is slightly less than the maximum pressure range of the lithium battery, and then the battery tooling is turned 90 degrees to make the lithium battery in a horizontal position, and then wait for a period of time to observe whether there is leakage on both sides of the lithium battery. If the electrolyte leaks, it will react with the aluminum profile battery shell, leaving white abnormal marks, to determine whether the battery is leaking, which is convenient for the inspector to detect the leaking battery, and inexperienced inspectors can also perform the inspection work.

[0007] Furthermore, the larger the spacing of the clamping cavity when it is in the expanded state, the easier it is to manually install the lithium battery, but correspondingly, the longer the distance the ejector needs to retreat. Since the ejector is a screw-on fit, a lot of time needs to be spent on rotating the ejector to achieve a larger expanded state, which is time-consuming and laborious. To this end, the utility model further provides a pre-ejector mounting hole on the first clamping plate, the pre-ejector mounting hole can be penetrated by a pre-ejector, the rear end of the pre-ejector is provided with a pre-ejector cap, the pre-ejector is further provided with two clamping blocks, and the pre-ejector mounting hole is provided with two grooves adapted to the shape of the clamping blocks; the ejector includes a bare rod section, a screw rod section and a hexagonal nut. When the utility model needs to loosen the clamping cavity, first rotate the ejector rod to completely screw the screw section out of the first clamping plate, and then pull out the bare rod section. At this time, the one-way clamp abuts against the pre-elevator rod, and then rotate the pre-elevator rod so that the two blocks are opposite to the two grooves. At this time, the entire pre-elevator rod can be pulled out of the pre-elevator rod mounting hole, and under the resetting action of the spring, the clamping cavity can be fully expanded.

[0008] Therefore, compared with the prior art, the utility model has the following characteristics: 1. The utility model controls the clamping state of the battery clamp group through the push rod. When the clamping cavity on the battery clamp group is in an expanded state, the lithium battery can be installed or removed. When the clamping cavity is tightened, the battery tooling is flipped 90 degrees to make the lithium battery in a horizontal position. Then, after waiting for a period of time, observe whether there is any leakage on both sides of the lithium battery. Therefore, the utility model can carry out small-batch leakage detection of cylindrical lithium battery cells. It has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 This is a structural schematic diagram of the utility model when the lithium battery is clamped;

[0010] Attached Figure 2 Yes Figure 1 A cross-sectional view of

[0011] Attached Figure 3 It is a schematic diagram of the structure of the battery tooling in an expanded state;

[0012] Attached Figure 4 It is a schematic diagram of the structure of the ejector rod;

[0013] Attached Figure 5 It is a schematic diagram of the structure of the pre-elevator;

[0014] Attached Figure 6 This is a diagram of the utility model in a state of detecting whether a lithium battery is leaking;

[0015] Attached Figure 7 It is the outline drawing of the pre-elevator mounting hole. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] Example 1: See Figure 1 , Figure 2 , Figure 6 A lithium battery cell testing device includes a bottom plate 100 and a battery fixture 200. The bottom plate is a tray structure with a recessed supporting cavity 110 on it. The battery fixture includes a first clamping plate 210, a second clamping plate 220, 8 connecting rods 230 fixedly connected between the two clamping plates, two sets of battery clamp groups 300 slidably connected to the connecting rods, and a top rod 240 screwed on the first clamping plate. The battery clamp group consists of two one-way clamps 31 located at both ends. 0. It consists of 8 two-way clamps 320 located in the middle and 18 springs 330 connected between any two adjacent clamps. The two-way clamps and the one-way clamps are slidably connected to the four connecting rods at the same time. An arc-shaped clamping groove 340 is provided on the inner side of the one-way clamp, and a clamping groove is provided on each side of the two-way clamp. A clamping cavity 350 is formed between two adjacent clamping grooves. By rotating the top rod so that its end continuously pushes the one-way clamp to move to one side, all the clamping cavities can be tightened synchronously.

[0019] The detection method of this embodiment is: place the battery tooling vertically in the supporting cavity of the bottom plate so that the clamping cavity is vertically distributed. At this time, the clamping cavity is in an expanded state, so the worker can easily put the cylindrical lithium battery to be tested into all the clamping cavities in turn, the bottom end of the battery abuts against the bottom plate, and then start to tighten the push rod. In practice, a torque wrench is generally used to operate. The push rod will slowly push the one-way clamp to move to one side of the second clamping plate, so that all the clamping cavities will begin to tighten and compress the spring until it rotates to a predetermined torque value. At this time, the clamping force generated by the clamping cavity on the lithium battery is slightly less than the maximum pressure range of the lithium battery, and then the battery tooling is turned 90 degrees so that the lithium battery is in a horizontal position, and then wait for a period of time to observe whether there is leakage on both sides of the lithium battery. If the electrolyte leaks, it will react with the aluminum profile battery shell, leaving white abnormal marks to determine whether the battery is leaking, which is convenient for the inspector to detect the leaking battery. Inexperienced inspectors can also perform inspection work.

[0020] See Figure 2 , Figure 4 , Figure 5 and Figure 7 The larger the spacing of the clamping cavity when it is in the expanded state, the easier it is to manually install the lithium battery. However, correspondingly, the longer the distance the ejector needs to retreat is. Since the ejector is a screw-on fit, a lot of time needs to be spent on rotating the ejector to achieve a larger expanded state, which is time-consuming and laborious. To this end, the present embodiment further provides a pre-ejector mounting hole 211 on the first clamping plate, and a pre-ejector 250 can be penetrated through the pre-ejector mounting hole. A pre-ejector cap 251 is provided at the rear end of the pre-ejector. Two clamping blocks 252 are also convexly provided on the pre-ejector, and two grooves 212 adapted to the shape of the clamping blocks are provided on the pre-ejector mounting hole; the ejector includes a bare rod section 241, a screw rod section 242 and a hexagonal nut 243. When the clamping cavity needs to be loosened in this embodiment, the push rod is first rotated to completely screw the screw segment out of the first clamping plate, and then the bare rod segment is pulled out. At this time, the one-way clamp is in contact with the pre-push rod, and then the pre-push rod is rotated so that the two blocks are opposite to the two grooves. At this time, the entire pre-push rod can be pulled out of the pre-push rod mounting hole, and under the resetting action of the spring, the clamping cavity can be fully expanded.

[0021] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. A lithium battery cell testing device, characterized in that: It includes a bottom plate and a battery fixture, which includes a first clamping plate, a second clamping plate, a plurality of connecting rods fixedly connected between the two clamping plates, a battery clamp group slidably connected to the connecting rods, and a push rod screwed on the first clamping plate. The battery clamp group is composed of two unidirectional clamps located at both ends, a plurality of bidirectional clamps located in the middle, and a plurality of springs connected between any two adjacent clamps. An arc-shaped clamping groove is provided on the inner side of the unidirectional clamp, a clamping groove is provided on each side of the bidirectional clamp, and a clamping cavity is formed between two adjacent clamping grooves. By rotating the push rod so that its end continuously pushes the unidirectional clamp to move to one side, all clamping cavities can be tightened synchronously.

2. The lithium battery cell testing device according to claim 1, characterized in that: The first clamping plate is also provided with a pre-elevator mounting hole, the pre-elevator mounting hole can be penetrated by a pre-elevator, the rear end of the pre-elevator is provided with a pre-elevator cap, the pre-elevator is also protruding with two clamping blocks, and the pre-elevator mounting hole is provided with two grooves adapted to the shape of the clamping blocks.

3. The lithium battery cell testing device according to claim 1 or 2, characterized in that: The bottom plate is a tray structure, on which a recessed supporting cavity is arranged.

4. The lithium battery cell testing device according to claim 1, characterized in that: The battery clamp group is provided with two groups, the connecting rods are provided with 8 pieces, and the bidirectional clamp and the unidirectional clamp are both slidably connected with four connecting rods at the same time.

5. The lithium battery cell testing device according to claim 1, characterized in that: The push rod comprises a polished rod section, a screw rod section and a hexagonal nut.

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