Blade battery expansion testing device

Abstract

The utility model provides a blade battery expansion testing device, which relates to the field of battery testing and comprises a driving assembly, an upper plate, a lower plate and a pressing plate arranged between the upper plate and the lower plate, and the upper plate, the pressing plate and the lower plate are connected through guide columns. The driving assembly is installed on the upper end face of the upper plate, the output end of the driving assembly is in transmission connection with the pressing plate through a connecting piece, and a displacement sensor is arranged below the pressing plate. A plurality of plane type pressure sensors are symmetrically arranged above the lower plate, and a mounting plate is arranged above the plurality of plane type pressure sensors, is positioned below the pressing plate and is used for placing a battery to be tested. According to the device, a plurality of plane type pressure sensors are used, so that the whole unbalance loading resistance of the device is high, friction force generated by the pressing plate and the guide column cannot be collected by the plane type pressure sensors due to the fact that the plane type pressure sensors are arranged on the lower portion, and detected data are high in precision.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a blade battery expansion testing device. Background Art

[0002] Secondary batteries have been widely used in the new energy industry. As the demand for capacity becomes higher and higher, the size of the battery design has also increased, and new products such as blade batteries have emerged. Battery products must undergo safety testing before leaving the factory, among which the changes in thickness and expansion force caused by the expansion during the charging and discharging process are one of the important indicators. At present, the expansion test for large-size batteries on the market is mostly limited to the use of manual fixtures with low control accuracy and measurement accuracy. The pressure sensor is a single-point type installed between the power source and the pressure plate. If the battery expands unevenly, the pressure plate will tilt to produce a radial force component, and the friction between the pressure plate and the guide column will be collected together by the planar pressure sensor. The measured data deviates from the vertical expansion force generated by the actual battery expansion. Utility Model Content

[0003] The utility model discloses a blade battery expansion testing device, aiming to improve the above technical problems.

[0004] The utility model adopts the following scheme:

[0005] A blade battery expansion testing device comprises a driving assembly, an upper plate, a lower plate and a pressing plate installed between the upper plate and the lower plate, wherein the upper plate, the pressing plate and the lower plate are connected via guide pillars; the driving assembly is installed on the upper end surface of the upper plate, and its output end is transmission-connected to the pressing plate via a connecting piece, and a displacement sensor is provided below the pressing plate; a plurality of planar pressure sensors are symmetrically arranged above the lower plate, a mounting plate is provided above the plurality of planar pressure sensors, and the mounting plate is located below the pressing plate for placing batteries to be tested.

[0006] As a further improvement, the number of the planar pressure sensors is four, and the four planar pressure sensors are symmetrically arranged on the lower plate.

[0007] As a further improvement, the displacement sensors are arranged at four corners below the pressure plate.

[0008] As a further improvement, there are four guide pillars, which are respectively distributed on the four corners of the upper plate, the pressure plate and the lower plate.

[0009] As a further improvement, both upper and lower ends of the guide column are sleeved with fixing nuts.

[0010] As a further improvement, guide pieces are provided on both upper and lower end surfaces of the pressure plate, and the guide pieces are sleeved on the outer wall of the guide column.

[0011] As a further improvement, the mounting plate is provided with a notch for mounting an auxiliary clamp.

[0012] As a further improvement, the driving component is a servo motor cylinder or a stepper motor cylinder.

[0013] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0014] The blade battery expansion testing device of the present application uses multiple planar pressure sensors, which makes the overall anti-eccentric load capability of the present application strong. At the same time, because they are arranged at the bottom, the friction force generated by the pressure plate and the guide column will not be collected by the planar pressure sensor, and the detected data is highly accurate. The existing pressure sensor is improved to a single-point type and installed between the power source and the pressure plate. If the battery expands unevenly, the pressure plate will tilt to generate a radial component force, and the friction force generated by the pressure plate and the guide column will be collected by the planar pressure sensor. There is a problem of deviation between the measured data and the vertical expansion force generated by the actual battery expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the blade battery expansion testing device of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0019] Example

[0020] The first embodiment of the utility model provides a blade battery expansion test device, including a driving assembly 1 (such as a servo motor electric cylinder or a stepper motor electric cylinder, etc.), an upper plate 3, a lower plate 10, and a pressing plate 6 installed between the upper plate 3 and the lower plate 10. The upper plate 3, the pressing plate 6 and the lower plate 10 are connected by guide pillars 4, and the upper and lower ends of the guide pillars 4 are sleeved with fixing nuts 11 for fastening. The fixing nuts 11 can also be used to level the upper plate 3 and the lower plate 10. Preferably, there are four guide pillars 4, which are respectively distributed at the four corners of the upper plate 3, the pressing plate 6 and the lower plate 10, so that the overall structure is symmetrical and the force is balanced.

[0021] In this embodiment, the driving assembly 1 is installed on the upper end surface of the upper plate 3, and its output end is transmission-connected to the pressure plate 6 through the connector 2. A displacement sensor 7 is provided below the pressure plate 6 for testing the expansion thickness of the battery. A number of planar pressure sensors 9 are symmetrically arranged above the lower plate 10, and a mounting plate 8 is provided above the planar pressure sensor 9. The mounting plate 8 is located below the pressure plate 6 for placing the battery to be tested. Preferably, there are four planar pressure sensors 9, and the four planar pressure sensors 9 are symmetrically arranged on the lower plate 10. By using a plurality of planar pressure sensors 9, the overall anti-eccentric load capability of the present application is strong. At the same time, because they are arranged below, the friction force generated by the pressure plate 6 and the guide column 4 will not be collected by the planar pressure sensor 9, and the detected data has high accuracy.

[0022] Preferably, the displacement sensors 7 are arranged at the four corners below the pressure plate 6, and the four displacement sensors 7 at the four corners are arranged around the detection plane. Through the displacement data of the four points, the plane coordinates of the pressure plate 6 can be accurately established, and the actual expansion thickness can be calculated by the average value. Compared with single-point thickness measurement, the measured thickness change is more accurate and can reach the micron level. And the planar pressure sensor 9 and the displacement sensor 7 can also be five or six, etc., and the utility model does not make specific restrictions.

[0023] Furthermore, guide members 5 are provided on both upper and lower end surfaces of the pressing plate 6. The guide members 5 are sleeved on the outer wall of the guide pillar 4 to guide the pressing plate 6 to move up and down, making its movement more stable.

[0024] Furthermore, the mounting plate 8 is provided with slots for installing auxiliary clamps, which are used to install auxiliary clamps when needed, such as charging cable clamps, additional fixation when the battery size is large, and additional detection sensors for a certain area of ​​the battery cell that is of particular concern.

[0025] Working process: During the test, just put the battery on the mounting plate 8, flexibly install the auxiliary fixture as needed, start the driving component 1, and the driving component 1 drives the pressing plate 6 to press down through the connecting part 2 (the guide part 5 guides smoothly on the guide column 4). After reaching the battery surface and reaching the rated preset pressure, the battery is charged and discharged. The displacement sensor 7 and the planar pressure sensor 9 collect the change data of the battery expansion amount and expansion force during the process, and finally the actual expansion thickness of the battery can be calculated based on the collected data.

[0026] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

Claims

1. A blade battery expansion test device, characterized in that: It includes a driving assembly, an upper plate, a lower plate and a pressing plate installed between the upper plate and the lower plate, wherein the upper plate, the pressing plate and the lower plate are connected by guide pillars; the driving assembly is installed on the upper end surface of the upper plate, and its output end is transmission-connected to the pressing plate through a connecting piece, and a displacement sensor is provided below the pressing plate; a plurality of planar pressure sensors are symmetrically arranged above the lower plate, and a mounting plate is provided above the plurality of planar pressure sensors, and the mounting plate is located below the pressing plate for placing batteries to be tested.

2. The blade battery expansion testing device according to claim 1, characterized in that: The number of the planar pressure sensors is four, and the four planar pressure sensors are symmetrically arranged on the lower plate.

3. The blade battery expansion testing device according to claim 1, characterized in that: The displacement sensors are arranged at four corners below the pressing plate.

4. The blade battery expansion testing device according to claim 1, characterized in that: There are four guide pillars, which are respectively distributed on four corners of the upper plate, the pressing plate and the lower plate.

5. The blade battery expansion testing device according to claim 1, characterized in that: The upper and lower ends of the guide column are both sleeved with fixing nuts.

6. The blade battery expansion testing device according to claim 1, characterized in that: The upper and lower end surfaces of the pressing plate are both provided with guide pieces, and the guide pieces are sleeved on the outer wall of the guide column.

7. The blade battery expansion testing device according to claim 1, characterized in that: The mounting plate is provided with a notch for mounting an auxiliary fixture.

8. The blade battery expansion testing device according to claim 1, characterized in that: The driving component is a servo motor electric cylinder or a stepper motor electric cylinder.

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