CN217639454U

CN217639454U - Detection apparatus for invariable pressure under lithium cell thickness continuously changes

Info

Publication number: CN217639454U
Application number: CN202220579337.2U
Authority: CN
Inventors: 赵月; 陈朝斌; 胡迈进
Original assignee: Changzhou Lvneng New Energy Testing Co ltd
Current assignee: Changzhou Lvneng New Energy Testing Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-10-21
Anticipated expiration: 2032-03-17

Abstract

The utility model relates to the technical field of battery detection, in particular to a detection device for constant pressure under the condition of continuously changing the thickness of a lithium battery, which comprises a base, an actuating mechanism and a buffer mechanism, wherein an optical axis is fixed on the base, the actuating mechanism is positioned between the base and a top plate and is connected on the optical axis in a sliding manner, the actuating mechanism comprises an active pressing plate and a passive pressing plate, a pressure sensor is fixed between the passive pressing plate and the base, a thickness detection device is installed between the active pressing plate and the passive pressing plate, and the buffer mechanism comprises a plurality of buffer cushions; the utility model discloses a pressure sensor records the pressure value and compares with the pressure value of applying in advance, controls power supply device and reduces the deviation to make power supply device can provide invariable pressure, thickness detection device can measure the lithium cell and receiving under certain constant pressure condition, because the biggest thickness change that leads to of ageing, and can cushion the initiative clamp plate that drops through buffer gear, can also play the effect of overpressure protection, avoid damaging the lithium cell.

Description

Detection apparatus for invariable lower pressure of lithium cell thickness sustained change

Technical Field

The utility model belongs to the technical field of the battery test technique and specifically relates to a detection apparatus for invariable holding down force of lithium cell thickness sustained variation is related to.

Background

Lithium batteries have many advantages such as high volumetric energy density, high gravimetric energy density, and low self-discharge rate, and thus are widely used in portable appliances such as mobile phones and tablet computers, but in other durable consumer products such as electric vehicles and hybrid electric vehicles, the lithium batteries are required to have a longer cycle life. However, lithium batteries are very complex systems, the aging process is more complex, and the capacity decay and the power decay are not caused by a single cause but by a number of different processes and their interactions.

Aging of lithium batteries can lead to significant and irreversible increase in battery thickness, thereby placing a high load on the battery module frame, mechanical support of the lithium batteries and consequent increase in module housing load, affecting aging of the batteries as the load evolves, and aging of lithium batteries can lead to increase in battery thickness, thereby increasing load. Therefore, the aging thickness of the battery under the load needs to be detected so as to research and judge the aging condition of the lithium battery.

The thickness detection device in the prior art generally measures the thickness of the battery by placing the battery between two pressing plates and applying pressure to the pressing plates by a driving mechanism, however, when the driving mechanism fails, the battery is subjected to external impact or heavy pressure, and smoking, fire or even explosion may occur, which endangers personal safety.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to overcome the problems that in the prior art, when a driving mechanism breaks down, the battery is subjected to external impact or heavy pressure, smoking, ignition and even explosion can occur, and personal safety is damaged, the detection device for the constant pressure under the condition of continuous change of the thickness of the lithium battery is provided.

In order to solve the technical problem, the utility model discloses a following technical scheme: a detection device for constant pressure under the condition of continuous change of the thickness of a lithium battery comprises a base, an actuating mechanism and a buffer mechanism;

the base is fixedly provided with a plurality of optical axes along the vertical direction, the tops of the optical axes are fixedly connected with a top plate, the top plate is horizontally arranged, and a power source device is fixed on the top plate;

the actuating mechanism is positioned between the base and the top plate and is connected to the optical axis in a sliding manner, the actuating mechanism comprises an active pressing plate and a passive pressing plate, the active pressing plate is fixedly connected with the output end of the power source device through a connecting plate, the power source device drives the active pressing plate to move along the vertical direction, a pressure sensor is fixed between the passive pressing plate and the base, and a thickness detection device is arranged between the active pressing plate and the passive pressing plate;

the buffer mechanism comprises a plurality of buffer pads which are respectively fixed at the bottom of the active pressure plate and the top of the passive pressure plate; when the power supply device breaks down, the initiative clamp plate drops, can pound well lithium cell or the personnel's of installing the lithium cell hand, receive external shock or heavy pressure when the lithium cell, can lead to the smoking, the incident of catching fire even explosion, harm personal safety, and the pressure protection logic that becomes invalid and the device loses efficacy when pressure sensor pressure acquisition, can't react to overpressure, the unable initiative of initiative clamp plate is returned promptly, can lead to the unusual pressurization of initiative clamp plate, partly unusual pressure can be offset to the rubber pad, avoid directly crushing the lithium cell.

Above-mentioned technical scheme applys predetermined pressure for initiative clamp plate through the power supply device, it is compressed between initiative clamp plate and passive clamp plate to be detected the lithium cell, lithium cell circulation charge and discharge takes place ageing, thereby lead to the thickness change to bring the pressure value change, pressure sensor measures the pressure value and feeds back to controlling means, the value of surveying compares with the predetermined value, its difference reduces the deviation through controlling means control power supply device, thereby make the power supply device can provide invariable pressure, thickness detecting means surveys the lithium cell and is receiving under certain constant pressure condition, because the biggest thickness change that ageing caused, and through the initiative clamp plate that buffer gear can cushion and drop, can also play the effect of excessive pressure protection.

Furthermore, the optical axis is sleeved with a plurality of linear bearings, sliding holes for the optical axis to pass through are formed in the driving pressing plate and the driven pressing plate, the linear bearings are installed in the sliding holes, and the friction force between the actuating mechanism and the optical axis can be reduced by achieving sliding connection of the actuating mechanism and the optical axis through the linear bearings.

Furthermore, each linear bearing is sleeved with two shaft snap springs, the two shaft snap springs on the linear bearing in the driving pressing plate are respectively positioned at the upper side and the lower side of the driving pressing plate, so that the linear bearing is fixed in the sliding hole of the driving pressing plate, and the two shaft snap springs on the linear bearing in the driven pressing plate are respectively positioned at the upper side and the lower side of the driven pressing plate, so that the linear bearing is fixed in the sliding hole of the driven pressing plate.

Furthermore, thickness detection device is the digital gauge, and the precision is high, but the thickness of precision measurement lithium cell at the charge-discharge in-process.

Furthermore, the power source device comprises a plurality of cylinders which are distributed circumferentially, so that the load applied to the lithium battery by the active pressing plate can be uniformly distributed.

Furthermore, the blotter cover is established the optical axis outside, and does not produce with linear bearing and for the axle jump ring and interfere, can save space, make this detection device structure more compact, and the middle lithium cell of better protection.

Further, the buffer pad is a rubber pad.

The utility model has the advantages that: the utility model discloses a pressure sensor records the pressure value and compares with the pressure value of applying in advance, controls power supply device and reduces the deviation to make power supply device can provide invariable pressure, thickness detection device can measure the lithium cell and receiving under certain constant pressure condition, because the biggest thickness change that leads to of ageing, and can cushion the initiative clamp plate that drops through buffer gear, can also play the effect of overpressure protection, avoid damaging the lithium cell.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a partial enlarged view of portion B of FIG. 1;

in the figure: 1. a base; 2. an optical axis; 3. a pressure sensor; 4. a top plate; 5. an active pressing plate; 6. a passive platen; 7. a linear bearing; 8. a clamp spring for the shaft; 9. a cushion pad; 10. a power source device; 11. a connecting plate; 12. thickness detection device.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1-3, the present invention is a device for detecting a constant pressure when the thickness of a lithium battery is continuously changed, which comprises a base 1, an actuating mechanism and a buffer mechanism;

base 1 is fixed with four optical axes 2 along vertical direction, and the top fixedly connected with roof 4 of four optical axes 2, roof 4 level set up, be fixed with power supply device 10 on roof 4, power supply device 10 includes a plurality of cylinders that are the circumference and distribute.

The actuator is located between the base 1 and the top plate 4 and is in sliding connection with the optical shaft 2, the actuator comprises an active pressing plate 5 and a passive pressing plate 6 which are right opposite, the active pressing plate 5 is fixedly connected with an output end of the power source device 10 through a connecting plate 11, the power source device 10 drives the active pressing plate 5 to move in the vertical direction, a pressure sensor 3 is fixed between the passive pressing plate 6 and the base 1, the pressure sensor 3 is located at the center of the base 1, a plurality of linear bearings 7 are sleeved on the optical shaft 2, sliding holes for the optical shaft 2 to penetrate are formed in the active pressing plate 5 and the passive pressing plate 6, the linear bearings 7 are installed in the sliding holes, two shaft-used clamping springs 8 are sleeved on each linear bearing 7, the two shaft-used clamping springs 8 on the linear bearings 7 in the active pressing plate 5 are located on the upper side and the lower side of the active pressing plate 5 respectively, and the two shaft-used clamping springs 8 on the linear bearings 7 in the passive pressing plate 6 are located on the upper side and the lower side of the passive pressing plate 6 respectively, so that the linear bearings 7 are fixed in the sliding holes. A digital gauge is arranged between the active pressing plate 5 and the passive pressing plate 6, and the thickness change of the lithium battery is measured by measuring the distance change between the active pressing plate 5 and the passive pressing plate 6.

The buffer mechanism comprises a plurality of buffer pads 9, the buffer pads 9 are respectively fixed at the bottom of the active pressing plate 5 and the top of the passive pressing plate 6 and sleeved outside the optical axis 2, and the buffer pads 9 are rubber pads; when power source device 10 breaks down, initiative clamp plate 5 drops, can pound well lithium cell or the personnel's of installing the lithium cell hand, receive external shock or heavy pressure when the lithium cell, probably lead to the smoking, the incident of catching fire even explosion, harm personal safety, and the pressure protection logic that becomes invalid and the device when 3 pressure acquisition of pressure sensor loses efficacy, can't react to overpressure, promptly initiative clamp plate 5 can't initiatively return, can lead to the unusual pressurization of initiative clamp plate 5, the rubber pad can offset partly unusual pressure, avoid directly crushing the lithium cell.

The working principle is as follows:

when the lithium battery pressing device is used, the piston rod of the air cylinder moves upwards, the active pressing plate 5 is lifted, the lithium battery is placed on the passive pressing plate 6, and then the piston rod of the air cylinder moves downwards to drive the active pressing plate 5 to press the lithium battery; in the testing process, the lithium battery is charged and discharged in a circulating mode, the pressure sensor 3 on the lower surface of the passive pressing plate 6 measures the pressure pressing the lithium battery, and the digital gauge measures the thickness change of the lithium battery by measuring the distance change between the active pressing plate 5 and the passive pressing plate 6; the change of the thickness of the battery causes the change of the output pressure of the cylinder, the change value is measured by the pressure sensor 3, the pressure sensor 3 feeds the measured pressure change value back to the control device, and the control device controls the cylinder to reduce the output pressure so as to keep the pressure at a preset value; and the digital gauge and the pressure sensor 3 are connected to an HMI (human machine interface), and the thickness change of the lithium battery under different constant pressures is recorded in real time.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a detection apparatus for invariable pressure under lithium cell thickness continuously changes which characterized in that: comprises a base (1), an actuating mechanism and a buffer mechanism;

a plurality of optical axes (2) are fixed on the base (1) along the vertical direction, the tops of the optical axes (2) are fixedly connected with a top plate (4), and a power source device (10) is fixed on the top plate (4);

the actuating mechanism is positioned between the base (1) and the top plate (4) and is connected to the optical axis (2) in a sliding manner, the actuating mechanism comprises an active pressing plate (5) and a passive pressing plate (6), the active pressing plate (5) is fixedly connected with the output end of the power source device (10) through a connecting plate (11), a pressure sensor (3) is fixed between the passive pressing plate (6) and the base (1), and a thickness detection device (12) is arranged between the active pressing plate (5) and the passive pressing plate (6);

the buffer mechanism comprises a plurality of buffer pads (9), and the plurality of buffer pads (9) are respectively fixed at the bottom of the active pressing plate (5) and the top of the passive pressing plate (6).

2. The device for detecting the constancy of pressure under the continuous variation of the thickness of a lithium battery as claimed in claim 1, characterized in that: the optical axis (2) is sleeved with a plurality of linear bearings (7), sliding holes for the optical axis (2) to pass through are formed in the driving pressing plate (5) and the driven pressing plate (6), and the linear bearings (7) are installed in the sliding holes.

3. The device for detecting the constant pressure of the continuously-changed thickness of the lithium battery as claimed in claim 2, wherein: two shaft snap springs (8) are sleeved on each linear bearing (7), the two shaft snap springs (8) on the linear bearings (7) in the driving pressing plate (5) are respectively positioned on the upper side and the lower side of the driving pressing plate (5), and the two shaft snap springs (8) on the linear bearings (7) in the driven pressing plate (6) are respectively positioned on the upper side and the lower side of the driven pressing plate (6).

4. The device for detecting the constancy of pressure under the continuous variation of the thickness of a lithium battery as claimed in claim 1, characterized in that: the thickness detection device (12) is a digital gauge.

5. The device for detecting the constant pressure of the continuously-changed thickness of the lithium battery as claimed in claim 1, wherein: the power source arrangement (10) comprises a plurality of circumferentially distributed cylinders.

6. The device for detecting the constancy of pressure under the continuous variation of the thickness of a lithium battery as claimed in claim 1, characterized in that: the buffer pad (9) is sleeved on the outer side of the optical axis (2).

7. The device for detecting the constant pressure of the continuously-changed thickness of the lithium battery as claimed in claim 1, wherein: the buffer pads (9) are rubber pads.