Square battery expansive force testing device

Abstract

The utility model provides a square battery expansive force testing device, which belongs to the field of battery expansive force testing and comprises a support plate used for arranging a battery. The bottom plate and the pressing plate are arranged on the two plate face sides of the carrying plate. The limiting assembly is arranged on the carrier plate and the pressing plate and limits the movement of the battery; the abutting piece is arranged on the limiting assembly and arranged between the carrying plate and the pressing plate. The pressing plate clamps the battery between the carrier plate and the pressing plate; the at least two propping parts are respectively propped against two opposite corners of the at least one battery between the carrier plate and the pressing plate; the head battery and the tail battery of a plurality of stacked batteries are limited by the limiting assembly to be free of position deviation, and meanwhile, the two abutting pieces located between the pressing plate and the carrying plate abut against the two opposite corners of each battery in the middle, so that the batteries are not prone to being expanded to the periphery under the condition that the batteries are not hindered from expanding to the periphery. The situation that the position of each battery located in the middle deviates is limited, and the problem that the battery clamped in the middle can be extruded out to be separated from the battery pack stack is avoided.

Description

Technical Field

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

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. During the cycle of lithium batteries, a small amount of gas will be generated inside the battery, causing the battery shell to expand outward and the extrusion module to deform, so an expansion detection device is needed to perform quality inspection on lithium batteries.

[0003] Chinese patent CN202011519002.3 discloses a lithium battery expansion detection device with high detection efficiency, including a base, a skateboard fixedly connected to the top of the base near the side wall, a top plate fixedly connected to the top of the skateboard, a first slide groove provided on the side wall of the skateboard, a support plate fixedly connected to the adjacent side wall of the base located on the skateboard, a third extrusion plate embedded in the support plate and fixedly connected to the side wall close to the base; a servo motor is fixedly connected to the top center of the top plate.

[0004] However, when a battery expands outward, its surface will bulge outward to form an arc surface. When multiple batteries are stacked together and quality inspected using an expansion detection device, the surfaces of adjacent batteries are in contact with each other through the arc surfaces. This causes the expansion detection device to squeeze the stacked batteries. When the squeezing force is transmitted to the arc surface, it will generate a lateral force that squeezes the batteries outward, which may cause the battery stacked in the middle to be squeezed out and will also have an adverse effect on the accuracy of the expansion detection results. Utility Model Content

[0005] In view of this, the utility model proposes a square battery expansion force testing device, which is used to solve the problem that when the expansion detection device squeezes the stacked batteries, the squeezing force will be transmitted to the curved surface, which will generate a lateral force that squeezes the batteries outward, which may cause the batteries stacked in the middle to be squeezed out and also have an adverse effect on the accuracy of the expansion detection results.

[0006] The technical solution of the utility model is implemented as follows: the utility model provides a square battery expansion force testing device, including a carrier plate, on which a battery is arranged; a bottom plate and a pressure plate, respectively arranged on two plate surface sides of the carrier plate, and the pressure plate moves in a vertical direction along the surface of the carrier plate; a pressure sensor, connected between the bottom plate and the carrier plate; two limit assemblies, respectively arranged on the carrier plate and the pressure plate, and the two limit assemblies limit the movement of the battery along the surface of the carrier plate or the pressure plate; at least two abutting members, arranged on the limit assemblies and arranged between the carrier plate and the pressure plate; wherein the pressure plate moves toward the carrier plate and clamps the battery between the carrier plate and the pressure plate; and at least two abutting members respectively abut on two opposite corners of at least one battery located between the carrier plate and the pressure plate.

[0007] On the basis of the above technical scheme, preferably, the limit assembly includes two limit bars, which are arranged on the carrier plate and the pressure plate; four limit blocks, which are arranged in groups of two on the two limit bars and are located between the two limit bars; wherein the limit bar moves along the surface of the carrier plate, the moving direction of the limit bar is perpendicular to the moving direction of the limit bar, the battery is clamped between the two limit bars and the battery is restricted from moving along the moving direction of the limit bar; the limit block moves along the extension direction of the limit bar, the battery is clamped between the four limit blocks and the battery is restricted from moving along the extension direction of the limit bar.

[0008] More preferably, the limiting strip and the limiting block are respectively abutted against two adjacent side surfaces of the battery.

[0009] More preferably, the limit assembly also includes a sliding rod, which is arranged between the carrier plate and the pressure plate and is perpendicular to the surface of the carrier plate; wherein both ends of the sliding rod are respectively connected to two symmetrically arranged limit blocks located on the carrier plate and the pressure plate; and the supporting member is arranged on the sliding rod and moves along the sliding rod.

[0010] More preferably, the sliding rod is a telescopic rod.

[0011] On the basis of the above technical solution, preferably, a corner groove is provided at the position where the abutting member contacts the battery, and the corner of the battery abuts against the inner wall of the corner groove.

[0012] More preferably, the cross-sectional shape of the angle groove is a right angle.

[0013] On the basis of the above technical solution, preferably, it also includes a top plate, which is arranged on the side of the pressure plate away from the surface of the carrier plate; a support rod, which is arranged between the top plate and the bottom plate; wherein the support rod is perpendicular to the surface of the carrier plate, and both ends of the support rod pass through the carrier plate and the pressure plate and are respectively connected to the bottom plate and the top plate.

[0014] More preferably, it also includes a driving cylinder, which is arranged on the top plate; wherein the driving cylinder has a driving end and the driving end is connected to the pressure plate, and the driving cylinder drives the pressure plate to move toward or away from the carrier plate.

[0015] More preferably, a floating joint is connected between the driving end of the driving cylinder and the pressure plate.

[0016] The square battery expansion force testing device of the utility model has the following beneficial effects compared with the prior art:

[0017] (1) The utility model uses a limiting assembly to prevent the head and tail batteries of a plurality of stacked batteries from shifting in position. At the same time, two abutting members located between the pressure plate and the carrier plate abut against two opposite corners of each battery in the middle, thereby limiting the positional shift of each battery in the middle without hindering the battery from expanding in all directions, thereby avoiding the problem that the battery sandwiched in the middle may be squeezed out of the battery stack.

[0018] (2) The utility model can adjust the distance between the two limit bars and the distance between the four limit blocks according to the size of the square battery. At the same time, the supporting block is also installed on the limit block and moves therewith, thereby being able to adapt to the testing requirements of batteries of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A three-dimensional diagram of the testing device of the utility model;

[0021] Figure 2 It is a side view of the testing device of the utility model;

[0022] Figure 3 It is a front view of the testing device of the utility model;

[0023] Figure 4 It is a partial stereogram of the limiting assembly of the utility model.

[0024] In the figure: 1. carrier plate; 2. bottom plate; 3. pressure plate; 4. pressure sensor; 5. limit assembly; 51. limit strip; 52. limit block; 53. slide bar; 6. supporting member; 601. angle groove; 7. top plate; 8. support rod; 9. driving cylinder. DETAILED DESCRIPTION

[0025] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown, combined Figure 4 The utility model discloses a square battery expansion force testing device, comprising a carrier plate 1, a bottom plate 2, a pressure plate 3, a pressure sensor 4, a limit assembly 5 and a supporting member 6.

[0027] The carrier board 1 is used to place batteries, which are usually square-shell batteries.

[0028] The bottom plate 2 and the pressing plate 3 are respectively arranged on two plate surface sides of the carrier plate 1 . Generally speaking, the test device is placed on a horizontal surface through the bottom plate 2 .

[0029] The pressing plate 3 moves along a direction perpendicular to the surface of the carrier plate 1 . The pressing plate 3 moves toward the carrier plate 1 and clamps the battery between the carrier plate 1 and the pressing plate 3 .

[0030] The pressure sensor 4 is connected between the bottom plate 2 and the carrier plate 1. The pressure sensor 4 is usually electrically connected to a data acquisition device and a data processing device, so that the data sensed by the pressure sensor 4 can be collected and processed to convert and obtain the change of the expansion force of the battery.

[0031] Two limiting components 5 are respectively arranged on the carrier plate 1 and the pressing plate 3 and respectively limit the battery closely attached to the carrier plate 1 and the pressing plate 3 from moving along the surface of the carrier plate 1. The function of the limiting components 5 is to lock the battery so that it will not move at will.

[0032] At least two abutting members 6 are arranged on the limiting assembly 5 and between the carrier plate 1 and the pressing plate 3 ; the at least two abutting members 6 are respectively abutted against two opposite corners of at least one battery located between the carrier plate 1 and the pressing plate 3 .

[0033] The specific operation of the test device is to place the battery to be tested on the carrier 1, and then lock the battery on the carrier 1 through the limit assembly 5 on the carrier 1 to ensure that the battery does not slide around; then drive the pressure plate 3 to press the battery, and then lock the battery on the pressure plate 3 through the limit assembly 5 on the pressure plate 3; since the battery is pressed by the pressure plate 3, the data of the pressure sensor 4 will change at this time, so the pressure sensor 4 needs to be zeroed before detection; then the test starts, the battery is connected to a general electrical device for discharge, the battery will expand to a certain extent, and the battery expansion will squeeze the carrier 1 and the pressure plate 3, so that the pressure sensor 4 can sense it, so that the data change of the battery expansion force can be inferred by observing the detection data change of the pressure sensor 4.

[0034] exist Figure 2 In a preferred embodiment shown, batteries of different sizes need to be tested, and the limiting assembly 5 includes a limiting bar 51 and a limiting block 52 .

[0035] Among them, two limit bars 51 are arranged on the carrier plate 1 and the pressure plate 3. The limit bars 51 move along the surface of the carrier plate 1, and the moving direction of the limit bars 51 is perpendicular to the moving direction of the limit bars 51. The two limit bars 51 clamp the battery and limit the battery from moving along the moving direction of the limit bars 51.

[0036] The four limit blocks 52 are arranged in pairs on the two limit bars 51 and between the two limit bars 51. The limit blocks 52 move along the extending direction of the limit bars 51, and the four limit blocks 52 clamp the battery and restrict the battery from moving along the extending direction of the limit bars 51.

[0037] Through the above technical solution, the distance between the two limit bars 51 and the distance between the four limit blocks 52 can be adjusted, so as to meet the testing requirements of batteries of different sizes.

[0038] exist Figure 2 In a preferred embodiment shown, for a square-shell battery, the limiting strip 51 and the limiting block 52 are respectively held against two adjacent sides of the battery. In short, the limiting strip 51 and the limiting block 52 respectively limit the battery from moving in two mutually perpendicular directions.

[0039] exist Figure 3 In a preferred embodiment shown, when testing batteries of different specifications, adjustments are required, and the position of the supporting block also needs to change accordingly. The limiting assembly 5 also includes a sliding rod 53.

[0040] The slide bar 53 is disposed between the carrier plate 1 and the pressure plate 3 and is perpendicular to the surface of the carrier plate 1 ; both ends of the slide bar 53 are respectively connected to two symmetrically disposed limit blocks 52 located on the carrier plate 1 and the pressure plate 3 .

[0041] The abutment member 6 is disposed on the slide bar 53 and moves along the slide bar 53. It should be noted that when the corner of the battery located in the middle abuts against the abutment member 6, the four side surfaces of the batteries located at the head and tail are also closely attached to the two limit bars 51 and the four limit blocks 52 respectively.

[0042] exist Figure 3 In a preferred embodiment shown, the distance between the carrier plate 1 and the pressing plate 3 will also change when testing batteries of different specifications or when the number of stacked batteries changes, so the slide bar 53 is preferably a telescopic rod. When the pressing plate 3 is pressed down, the distance between the carrier plate 1 and the pressing plate 3 will also be shortened to a certain extent, and the slide bar 53 will shrink accordingly, which can avoid hindering the pressing of the pressing plate 3, and the abutment member 6 is still abutted on the corner of the battery.

[0043] exist Figure 1In a preferred embodiment shown, in order to firmly clamp the two opposite corners of the battery so that the battery located in the middle of the stacked batteries will not be displaced, a corner groove 601 is provided at the portion where the supporting member 6 contacts the battery, so that the corner of the battery abuts against the inner wall of the corner groove 601.

[0044] exist Figure 1 In a preferred embodiment shown, since the four corners of a square-shell battery are usually right angles, the cross-sectional shape of the corner groove 601 is also preferably a right angle. Since the detection device of the present application can also be applied to the expansion force detection of batteries of other shapes, the cross-sectional shape of the corner groove 601 is a contoured shape, so that it can be replaced according to the shape of the battery.

[0045] exist Figure 1 In a preferred embodiment shown, in order to ensure that the moving directions of the carrier plate 1 and the pressure plate 3 are always along the vertical direction of the surface of the carrier plate 1, so as to obtain accurate battery expansion force change data, a top plate 7 and a support rod 8 are also included.

[0046] The top plate 7 is arranged on the plate surface side of the pressing plate 3 away from the carrier plate 1 .

[0047] The support rod 8 is arranged between the top plate 7 and the bottom plate 2; the support rod 8 is perpendicular to the surface of the carrier plate 1, and the two ends of the support rod 8 pass through the carrier plate 1 and the pressure plate 3 and are respectively connected to the bottom plate 2 and the top plate 7. The frame structure surrounded by the top plate 7, the bottom plate 2 and the support rod 8 forms a stable structural body of the detection device. At the same time, the support rod 8 also plays a guiding role, guiding the carrier plate 1 and the pressure plate 3 to move along the vertical direction of the surface of the carrier plate 1, so that the pressure plate 3 will not produce a large deflection during the movement, thereby improving the test accuracy, so that accurate battery expansion force change data can be obtained.

[0048] exist Figure 1 In the preferred embodiment shown, a driving cylinder 9 is also included.

[0049] The driving cylinder 9 is arranged on the top plate 7; the driving cylinder 9 is used to provide thrust for driving the pressing plate 3 to move, and has a stable thrust force; the driving cylinder 9 has a driving end and the driving end is connected to the pressing plate 3, and the driving cylinder 9 drives the pressing plate 3 to move toward or away from the carrier plate 1. The driving cylinder 9 can adopt a telescopic push rod mechanism.

[0050] In addition, a button switch will be installed on the top plate 7 to control the pushing and lifting of the driving cylinder 9; a pressure regulating valve can also be installed to connect the air intake pipe of the driving cylinder 9. The function of the pressure regulating valve is to adjust the air intake pressure of the driving cylinder 9, thereby controlling the thrust of the driving cylinder 9.

[0051] exist Figure 1In a preferred embodiment shown, in order to avoid the driving cylinder 9 from dying during telescopic pushing, thereby helping to increase the service life of the driving cylinder 9, a floating joint is connected between the driving end of the driving cylinder 9 and the pressure plate 3.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A square battery expansion force testing device, characterized in that: include: A carrier plate (1) on which a battery is arranged; The bottom plate (2) and the pressing plate (3) are respectively arranged on two plate surface sides of the carrier plate (1), and the pressing plate (3) moves in a direction perpendicular to the surface of the carrier plate (1); A pressure sensor (4) connected between the base plate (2) and the carrier plate (1); Two limit assemblies (5) are respectively arranged on the carrier plate (1) and the pressure plate (3), and the two limit assemblies (5) limit the movement of the battery along the surface of the carrier plate (1) or the pressure plate (3); At least two abutting members (6) are arranged on the limiting assembly (5) and between the carrier plate (1) and the pressing plate (3); Wherein, the pressing plate (3) moves toward the carrier plate (1) and clamps the battery between the carrier plate (1) and the pressing plate (3); At least two of the abutting members (6) are respectively abutted against two opposite corners of at least one battery located between the carrier plate (1) and the pressure plate (3).

2. A square battery expansion force testing device according to claim 1, characterized in that: The limiting component (5) comprises: Two limit strips (51) are arranged on the carrier plate (1) and the pressure plate (3); Four limiting blocks (52), arranged in pairs on the two limiting strips (51) and located between the two limiting strips (51); The limiting strip (51) moves along the surface of the carrier plate (1), the moving direction of the limiting strip (51) is perpendicular to the moving direction of the limiting strip (51), and the battery is clamped between the two limiting strips (51) and is restricted from moving along the moving direction of the limiting strip (51); The limiting blocks (52) move along the extension direction of the limiting strip (51), and the four limiting blocks (52) clamp the battery and restrict the battery from moving along the extension direction of the limiting strip (51).

3. A square battery expansion force testing device according to claim 2, characterized in that: The limiting strip (51) and the limiting block (52) are respectively held against two adjacent side surfaces of the battery.

4. A square battery expansion force testing device according to claim 2, characterized in that: The limiting component (5) further comprises: A sliding rod (53) is arranged between the carrier plate (1) and the pressing plate (3) and is perpendicular to the surface of the carrier plate (1); Wherein, the two ends of the sliding rod (53) are respectively connected to the two symmetrically arranged limit blocks (52) located on the carrier plate (1) and the pressure plate (3); The abutting member (6) is arranged on the sliding rod (53) and moves along the sliding rod (53).

5. A square battery expansion force testing device according to claim 4, characterized in that: The sliding rod (53) is a telescopic rod.

6. A square battery expansion force testing device according to claim 1, characterized in that: A corner groove (601) is provided at the position where the abutting piece (6) contacts the battery, and the corner of the battery abuts against the inner wall of the corner groove (601).

7. A square battery expansion force testing device according to claim 6, characterized in that: The cross-sectional shape of the angle groove (601) is a right angle.

8. A square battery expansion force testing device according to claim 1, characterized in that: Also includes: A top plate (7) is arranged on a plate surface side of the pressing plate (3) away from the carrier plate (1); A support rod (8) is arranged between the top plate (7) and the bottom plate (2); The support rod (8) is perpendicular to the surface of the carrier plate (1), and two ends of the support rod (8) pass through the carrier plate (1) and the pressure plate (3) and are respectively connected to the bottom plate (2) and the top plate (7).

9. A square battery expansion force testing device according to claim 8, characterized in that: Also includes: A driving cylinder (9) is arranged on the top plate (7); The driving cylinder (9) has a driving end and the driving end is connected to the pressing plate (3), and the driving cylinder (9) drives the pressing plate (3) to move toward or away from the carrier plate (1).

10. A square battery expansion force testing device according to claim 9, characterized in that: A floating joint is connected between the driving end of the driving cylinder (9) and the pressing plate (3).

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