CN222165945U - Battery thickness measuring device - Google Patents

Abstract

The utility model belongs to the technical field of batteries and discloses a battery thickness measuring device which comprises a base, a support and a pressing plate, wherein a limiting piece is arranged on the base, an object to be measured can be placed on the base, the limiting piece is used for being attached to the side wall of the object to be measured, the support is arranged on one side of the base, on which the object to be measured is placed, a digital display dial indicator and a driving piece are arranged, the digital display dial indicator is arranged on one side of the support, which is away from the base, the pressing plate is arranged between the base and the support, a measuring rod of the digital display dial indicator movably penetrates through the support and is connected with the pressing plate, a driving end of the driving piece is connected with the pressing plate, and the driving piece is used for driving the pressing plate to press the object to be measured on the base.

Description

Battery thickness measuring device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery thickness measuring device.

Background

Before the battery leaves the factory, the thickness of the battery needs to be detected, the thickness of the battery is measured by adopting a vernier caliper in the existing thickness measuring method, the measuring precision of the method is low, the measuring standard cannot be met, the efficiency of a manual thickness measuring mode is low, and the production efficiency of the battery is not improved.

Therefore, it is needed to provide a battery thickness measuring device to solve the above-mentioned problems.

Disclosure of utility model

The utility model aims to provide a battery thickness measuring device which can improve thickness measuring precision and thickness measuring efficiency.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery thickness measuring apparatus comprising:

The base is provided with a limiting piece, an object to be detected can be placed on the base, and the limiting piece is used for being attached to the side wall of the object to be detected;

The bracket is arranged on one side of the base where the object to be measured is placed, a digital display dial indicator and a driving piece are arranged on the bracket, and the digital display dial indicator is positioned on one side of the bracket away from the base;

The pressing plate is positioned between the base and the support, the measuring rod of the digital display dial indicator movably penetrates through the support and is connected with the pressing plate, the driving end of the driving piece is connected with the pressing plate, and the driving piece is used for driving the pressing plate to press an object to be measured on the base.

Optionally, the battery thickness measuring device further comprises a connecting piece, a connecting hole is formed in the limiting piece, a connecting portion is arranged on the base, and the connecting piece penetrates through the connecting hole and is detachably connected with the connecting portion.

Alternatively, the number of the connecting portions is plural, and the plurality of connecting portions are arranged at intervals in a direction parallel to the side wall of the object to be measured.

Optionally, the connecting hole is a bar hole, and an extending direction of the bar hole is perpendicular to a side wall of the object to be detected.

Optionally, the height of the limiting member is smaller than the thickness of the object to be measured, and/or the orthographic projection of the limiting member on the base and the orthographic projection of the pressing plate on the base are staggered.

Optionally, the battery thickness measuring device further comprises a guide shaft, one end of the guide shaft is connected with one side of the pressing plate, which is away from the base, and the other end of the guide shaft movably penetrates through the support.

Optionally, the battery thickness measuring device further comprises a linear bearing, the linear bearing is arranged on the support, and the other end of the guide shaft is movably connected with the inner ring of the linear bearing.

Optionally, the battery thickness measuring device further comprises a pressure sensor, the pressure sensor is arranged on one side of the pressing plate, which is away from the base, and the driving end of the driving piece is connected with one side of the pressure sensor, which is away from the pressing plate.

Optionally, the battery thickness measuring device further comprises a connecting plate, and the connecting plate is arranged between the pressure sensor and the driving end of the driving piece.

Optionally, the driving end of the driving piece is provided with a connecting block, and the connecting block is connected with the connecting plate.

The beneficial effects are that:

The battery thickness measuring device provided by the utility model is provided with the driving piece and the digital display dial indicator, when the thickness is measured, the driving piece drives the pressing plate to press the object to be measured on the base, and then the numerical value of the digital display dial indicator is read, so that manual thickness measurement by using a vernier caliper is omitted, the device is convenient to operate, the thickness measuring efficiency is improved, the thickness measuring precision can be greatly improved by adopting the digital display dial indicator, in addition, when the object to be measured is placed on the base, the side wall of the object to be measured is attached to the limiting piece, the displacement of the object to be measured in the process that the pressing plate moves towards the base is avoided, the pressing plate can be pressed on one side of the object to be measured, which is far away from the base, and the effect of further improving the thickness measuring precision is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a battery thickness measuring device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a battery thickness measuring device according to an embodiment of the present utility model, in which the first protective cover, the second protective cover, and the second support plate are not shown;

fig. 3 is a schematic structural diagram of a battery thickness measuring device according to an embodiment of the present utility model.

In the figure:

10. An object to be measured;

100. Base 110, first base plate 120, second base plate 130, third base plate 131, connecting part 200, bracket 210, first support plate 220, second support plate 300, pressing plate 400, limit piece 410, first limit part 420, second limit part 421, connecting hole 510, digital display dial indicator 511, measuring rod 512, fixing rod 520, driving piece 521, connecting block 610, guiding shaft 620, linear bearing 630, first fixing block 710, pressure sensor 720, connecting plate 800, fixing component 810, connecting shaft 820, second fixing block 830, fixing plate 840, knob 910, first protective cover 920, second protective cover.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a battery thickness measuring device, which can improve thickness measuring precision and thickness measuring efficiency.

Specifically, as shown in fig. 1 to 3, the battery thickness measuring device includes a base 100, a support 200 and a pressing plate 300, wherein the base 100 is provided with a limiting member 400, an object 10 to be measured can be placed on the base 100, the limiting member 400 is used for being attached to a side wall of the object 10 to be measured, the support 200 is arranged on one side of the base 100 where the object 10 to be measured is placed, the support 200 is provided with a digital display dial indicator 510 and a driving member 520, the digital display dial indicator 510 is located on one side of the support 200, which is away from the base 100, the pressing plate 300 is located between the base 100 and the support 200, a measuring rod 511 of the digital display dial indicator 510 is movably arranged on the support 200 and connected with the pressing plate 300, a driving end of the driving member 520 is connected with the pressing plate 300, and the driving member 520 is used for driving the pressing plate 300 to press the object 10 to be measured on the base 100.

Alternatively, the object to be measured 10 may be a square battery, or may be another component requiring thickness measurement, and the embodiment will be described taking the square battery as an example of the object to be measured 10.

When the thickness of the square battery is measured by the battery thickness measuring device provided by the embodiment, the square battery is placed on the base 100, the side wall of the square battery is attached to the limiting piece 400, so that the square battery is positioned, then the driving piece 520 drives the pressing plate 300 to move towards the direction of the base 100, at the moment, the measuring rod 511 of the digital display dial indicator 510 stretches along with the movement of the pressing plate 300 until the pressing plate 300 presses the square battery, the pressing plate 300 stops moving, the numerical value on the digital display dial indicator 510 is read, after the reading is finished, the driving piece 520 drives the pressing plate 300 to move along the direction away from the base 100, at the moment, the measuring rod 511 of the digital display dial indicator 510 shortens along with the movement of the pressing plate 300 until the pressing plate 300 resets.

It can be seen that when the thickness of the square battery is measured by adopting the battery thickness measuring device, the driving piece 520 drives the pressing plate 300 to press the square battery on the base 100, then the numerical value of the digital display dial indicator 510 is read, the manual thickness measurement by using a vernier caliper is omitted, the operation is convenient and fast, the thickness measuring efficiency is improved, the thickness measuring precision can be greatly improved by adopting the digital display dial indicator 510, in addition, when the square battery is placed on the base 100, the side wall of the square battery is attached to the limiting piece 400, the displacement of the square battery in the process that the pressing plate 300 moves towards the base 100 is avoided, the pressing plate 300 is ensured to be pressed on one side of the square battery, which is away from the base 100, and the effect of further improving the thickness measuring precision is achieved.

Alternatively, as shown in fig. 1 to 3, two digital dial indicators 510 are provided, the two digital dial indicators 510 are respectively located at two ends of the pressing plate 300, and the driving end of the driving member 520 is located between the two digital dial indicators 510, so as to further improve the thickness measurement accuracy.

Optionally, the height of the limiting member 400 is smaller than the thickness of the square battery, and/or the front projection of the limiting member 400 on the base 100 and the front projection of the pressing plate 300 on the base 100 are staggered, so that when the pressing plate 300 moves towards the square battery, the pressing plate 300 can be prevented from pressing onto the limiting member 400, and the pressing plate 300 is ensured to press onto the square battery.

Alternatively, as shown in fig. 1 to 3, the square battery includes a long side wall and a short side wall, and the stopper 400 in the present embodiment is configured to be attached to the long side wall to improve the positioning effect of the square battery. Of course, in other embodiments, the stop 400 may be attached to the short sidewall, or the stop 400 may be attached to the long sidewall and the short sidewall, respectively. For ease of understanding, the length direction of the square battery is regarded as the x direction in fig. 2, the width direction of the square battery is regarded as the y direction in fig. 2, and the thickness direction of the square battery is regarded as the z direction in fig. 2 in this embodiment.

Further, the number of the limiting members 400 is more than two, for example, two, three or more limiting members 400 may be provided, and the two or more limiting members 400 are disposed at intervals along the length direction of the square battery, so as to further improve the positioning effect of the square battery.

Optionally, as shown in fig. 1 to 3, the battery thickness measuring device further includes a connecting piece (not shown in the drawings), the limiting piece 400 is provided with a connecting hole 421, the base 100 is provided with a connecting portion 131, and the connecting piece is arranged through the connecting hole 421 and detachably connected with the connecting portion 131, so as to realize a structure that the limiting piece 400 is detachably connected with the base 100, and the square battery is conveniently placed on the base 100.

Further, the connecting member is a bolt, and the connecting portion 131 is a threaded hole in threaded engagement with the bolt. In another embodiment, the connection member is a plug, the connection portion 131 is a slot or a jack, and the plug is detachably inserted into the slot or the jack, so long as the structure is capable of realizing the detachable connection between the connection member and the connection portion 131, which is not described in detail herein.

Alternatively, as shown in fig. 1 to 3, the number of the connection portions 131 is plural, the plural connection portions 131 are configured to be arranged at intervals along a direction parallel to the side wall of the square battery, in this embodiment, each of the limiting members 400 corresponds to the plural connection portions 131, and the plural connection portions 131 are arranged at intervals along the x direction, so that the positions of the limiting members 400 can be conveniently adjusted along the x direction, so as to adapt to square batteries with different lengths, and the limiting members 400 can have good positioning effects on the square batteries with different lengths.

Alternatively, as shown in fig. 1 to 3, the connecting hole 421 is a bar-shaped hole, and the extending direction of the bar-shaped hole is perpendicular to the side wall of the square battery attached to the limiting member 400, that is, the bar-shaped hole extends along the y direction, so that the position of the limiting member 400 can be conveniently adjusted along the y direction to adapt to square batteries with different widths, and the limiting member 400 can have good positioning effect on square batteries with different widths.

Alternatively, as shown in fig. 1 to 3, the limiting member 400 includes a first limiting portion 410 and a second limiting portion 420, the first limiting portion 410 is connected to and perpendicular to the second limiting portion 420, the first limiting portion 410 is used for being attached to a side wall of the square battery, the connecting hole 421 is formed in the second limiting portion 420, the second limiting portion 420 is connected to the base 100 through the connecting member, and the structural arrangement can enlarge an attaching area of the limiting member 400 and the side wall of the square battery, so that a positioning effect of the limiting member 400 on the square battery is improved.

Alternatively, as shown in fig. 1 to 3, the battery thickness measuring device further includes a guide shaft 610 with a diameter of 140mm, one end of the guide shaft 610 is connected to one side of the pressing plate 300, which is away from the base 100, through a first fixing block 630, the other end of the guide shaft 610 movably penetrates through the bracket 200, and the guide shaft 610 plays a role in guiding movement of the pressing plate 300, so that thickness measuring stability is improved. It should be noted that in other embodiments, guide shafts 610 of other diameters may be selected, as desired.

Further, as shown in fig. 1 to 3, the battery thickness measuring apparatus further includes a linear bearing 620, the linear bearing 620 is disposed on the bracket 200, and the other end of the guide shaft 610 is movably connected with an inner ring of the linear bearing 620 to improve the guiding effect on the pressing plate 300.

Preferably, as shown in fig. 1 to 3, the number of the guide shafts 610 is plural, for example, the guide shafts 610 may be two, four, six, etc., and the plurality of guide shafts 610 are uniformly distributed on the platen 300, and each guide shaft 610 corresponds to one linear bearing 620 to enhance the guiding effect on the movement of the platen 300.

In actual thickness measurement operation, part of the battery needs to be measured under a certain pressure, and the prior art is usually performed by adopting a manual pressing mode, however, the pressure applied to the battery by adopting the mode is unstable, and the specific pressure value to which the battery is subjected cannot be known. In order to solve the technical problem, as shown in fig. 1 to 3, the battery thickness measuring device provided in this embodiment further includes a pressure sensor 710, the pressure sensor 710 is disposed on a side of the pressing plate 300 away from the base 100, the driving end of the driving member 520 is connected with a side of the pressure sensor 710 away from the pressing plate 300, when the driving member 520 drives the pressing plate 300 to press the square battery on the base 100, the pressure sensor 710 can detect a pressure value received by the square battery in real time, so that an operator can conveniently read a specific pressure value received when the square battery is measured thick, and compared with a manual pressing mode, the embodiment applies a pressing force to the square battery by using the driving member 520, thereby improving stability of applying pressure to the square battery.

Further, as shown in fig. 1 to 3, the battery thickness measuring device further includes a connection plate 720, the connection plate 720 is disposed between the pressure sensor 710 and the driving end of the driving member 520, the connection plate 720 can protect the pressure sensor 710, and the driving end of the driving member 520 can transmit pressure to the pressure sensor 710 uniformly, so as to improve the detection accuracy of the pressure sensor 710.

Preferably, as shown in fig. 1 to 3, the driving end of the driving member 520 is provided with a connection block 521, the driving end of the driving member 520 is connected with the connection plate 720 through the connection block 521, and the contact area between the driving end of the driving member 520 and the connection plate 720 is enlarged by the connection block 521, so that the uniformity of pressure transmitted to the pressure sensor 710 can be further improved, and the detection accuracy of the pressure sensor 710 is further improved.

Alternatively, as shown in fig. 1 to 3, the number of the driving pieces 520 is plural, and the plurality of driving pieces 520 are uniformly distributed along the circumferential direction of the connection plate 720 to improve uniformity of applying pressure to the pressure sensor 710 and the square battery, with the effect of improving accuracy of measuring the pressure value. In this embodiment, the number of driving members 520 is two, and the two driving members 520 are symmetrically disposed about the center line of the connecting plate 720. In other embodiments, the driving member 520 may be three or four, as required by actual measurement.

Alternatively, the drive 520 may be a linear drive element such as a cylinder or progressive motor.

Alternatively, as shown in fig. 1 to 3, the base 100 includes a first base plate 110, a second base plate 120, and a third base plate 130, wherein the first base plate 110 is used for being placed on a horizontal plane, the second base plate 120 is sandwiched between the first base plate 110 and the third base plate 130, the third base plate 130 is used for supporting square batteries, and the connecting portion 131 is disposed on the third base plate 130. The bracket 200 comprises a first support plate 210 and a second support plate 220, wherein the digital display dial indicator 510, the fixed end of the driving piece 520 and the linear bearing 620 are all arranged on the first support plate 210, one end of the guide shaft 610, which is movably connected with the linear bearing 620, penetrates through the first support plate 210, two sides of the first support plate 210 are respectively provided with the second support plate 220, the second support plate 220 is supported between the first bottom plate 110 and the first support plate 210 so as to play a supporting role on the first support plate 210, and when the part arranged on the bracket 200 slightly shakes, the structural design can avoid the influence on the square battery caused by slight shaking, so that the thickness measuring stability and the thickness measuring precision are improved.

Alternatively, as shown in fig. 1 to 3, the digital display dial indicator 510 is mounted on the first support plate 210 through the fixing assembly 800, specifically, the fixing assembly 800 includes a connecting shaft 810, a second fixing block 820, two fixing plates 830 and two knobs 840, one end of the connecting shaft 810 is fixed on the first support plate 210 through the second fixing block 820, the other end of the connecting shaft 810 extends towards a direction away from the first support plate 210, the fixing rods 512 of the connecting shaft 810 and the digital display dial indicator 510 are respectively clamped between the two fixing plates 830, the two knobs 840 respectively penetrate through the two fixing plates 830 and are in threaded connection with a corresponding nut (not shown) or threaded hole on the fixing plate 830, the knob 840 close to the fixing rod 512 is located on a side of the fixing rod 512 away from the connecting shaft 810, and the knob 840 close to the connecting shaft 810 is located on a side of the connecting shaft 810 away from the fixing rod 512, so as to mount the digital display dial indicator 510 on the first support plate 210. Of course, in other embodiments, the digital dial indicator 510 may be mounted on the first support 210 by other structures, which are not listed here. In this embodiment, the diameter of the connecting shaft 810 is 200mm, and in other embodiments, other diameters of the connecting shaft 810 may be selected, as required by the actual use.

Optionally, as shown in fig. 1 to 3, the outer side of the driving member 520 is covered with a first protective cover 910 to protect and prevent dust of the driving member 520. The first support plate 210 is further provided with a second protection cover 920, and the second protection cover 920 covers one side of the guide shaft 610 extending out of the first support plate 210, so as to protect and prevent dust on the guide shaft 610.

The following briefly describes a method of using the battery thickness measuring device provided in this embodiment:

Referring to fig. 1 to 3, a battery module (not shown) is disposed on the third base plate 130, and the limiting member 400 is adjusted so that the limiting member 400 is attached to a side wall of the battery module. The driving member 520 is started, the driving member 520 drives the pressing plate 300 to press the battery standard block on the third bottom plate 130, the value of the pressure sensor 710 is recorded, the value is recorded as a standard pressure value, the digital display dial indicator 510 is zeroed, the driving member 520 reversely drives the pressing plate 300 to loosen the battery standard block, and the thickness value of the battery standard block is regarded as a standard thickness value for convenience of understanding. Taking out the battery standard block, placing the square battery to be tested on the third bottom plate 130, attaching the side wall of the square battery to the limiting piece 400, starting the driving piece 520 again, enabling the pressing plate 300 to press the square battery to the third bottom plate 130, when the numerical value of the pressure sensor 710 is the same as the standard pressure value, the numerical value displayed by the digital display dial indicator 510 is the difference value between the actually measured thickness of the square battery and the standard thickness value, and reading the numerical value displayed by the digital display dial indicator 510 can judge whether the actually measured thickness of the square battery meets the requirement. After the reading of the digital display dial indicator 510 is finished, the driving piece 520 drives the pressing plate 300 reversely to loosen the square battery, and the next thickness measurement is waited.

It should be noted that, the use method of the battery thickness measuring device provided in this embodiment is not limited to the above use method, and in other embodiments, other thickness measuring methods may be used, for example, in the initial stage of thickness measurement, the driving member 520 is started, the driving member 520 drives the pressing plate 300 to be attached to the third bottom plate 130, and the digital display dial indicator 510 is zeroed. The driving member 520 reversely drives the pressing plate 300 to pull the distance between the pressing plate 300 and the third base plate 130, places the square battery on the third base plate 130, then the driving member 520 drives the pressing plate 300 to press the square battery on the third base plate 130, and then reads the numerical value of the digital display dial indicator 510.

The battery thickness measuring device provided by the embodiment is suitable for square batteries (especially blade batteries) of various types, in the thickness measuring process, the real-time pressure value suffered by the square batteries during thickness measurement can be known by reading the value of the pressure sensor 710, and the thickness measurement is performed by adopting the digital display dial indicator 510, so that the thickness measuring precision is improved, the data of each thickness measurement can be stored, and the thickness measuring record can be conveniently searched.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The battery thickness measuring device, its characterized in that includes:

The device comprises a base (100), wherein a limiting piece (400) is arranged on the base (100), an object to be detected (10) can be placed on the base (100), and the limiting piece (400) is used for being attached to the side wall of the object to be detected (10);

The bracket (200) is arranged on one side of the base (100) where the object (10) to be detected is placed, a digital display dial indicator (510) and a driving piece (520) are arranged on the bracket (200), and the digital display dial indicator (510) is positioned on one side of the bracket (200) away from the base (100);

The clamp plate (300), clamp plate (300) are located base (100) with between support (200), measuring rod (511) of digital display percentage table (510) movably wears to locate support (200) and with clamp plate (300) are connected, the drive end of driver (520) with clamp plate (300) are connected, driver (520) are used for the drive clamp plate (300) will await measuring thing (10) are pressed on base (100).

2. The battery thickness measuring device according to claim 1, further comprising a connecting piece, wherein the limiting piece (400) is provided with a connecting hole (421), the base (100) is provided with a connecting portion (131), and the connecting piece is arranged in the connecting hole (421) in a penetrating manner and is detachably connected with the connecting portion (131).

3. The battery thickness measuring device according to claim 2, wherein the number of the connecting portions (131) is plural, and the plurality of connecting portions (131) are arranged to be spaced apart in a direction parallel to the side wall of the object (10).

4. The battery thickness measuring device according to claim 2, wherein the connection hole (421) is a bar-shaped hole extending in a direction perpendicular to the side wall of the object (10).

5. The battery thickness measuring device according to any one of claims 1 to 4, wherein the height of the limiting member (400) is smaller than the thickness of the object to be measured (10), and/or the front projection of the limiting member (400) on the base (100) and the front projection of the pressing plate (300) on the base (100) are staggered from each other.

6. The battery thickness measuring device according to any one of claims 1 to 4, further comprising a guide shaft (610), one end of the guide shaft (610) is connected to a side of the pressing plate (300) facing away from the base (100), and the other end of the guide shaft (610) is movably inserted through the bracket (200).

7. The battery thickness measuring device according to claim 6, further comprising a linear bearing (620), wherein the linear bearing (620) is disposed on the bracket (200), and the other end of the guide shaft (610) is movably connected with an inner ring of the linear bearing (620).

8. The battery thickness measuring device according to any one of claims 1 to 4, further comprising a pressure sensor (710), wherein the pressure sensor (710) is disposed on a side of the pressure plate (300) facing away from the base (100), and wherein the driving end of the driving member (520) is connected to a side of the pressure sensor (710) facing away from the pressure plate (300).

9. The battery gauge apparatus of claim 8, further comprising a connection plate (720), the connection plate (720) being disposed between the pressure sensor (710) and the drive end of the driver (520).

10. The battery thickness measuring device according to claim 9, wherein the driving end of the driving member (520) is provided with a connection block (521), and the connection block (521) is connected with the connection plate (720).