Test fixture for battery cover plate

Abstract

The utility model belongs to the technical field of battery detection, and particularly discloses a test fixture for a battery cover plate, and when a second fixture and a first fixture are buckled and compressed, a sealing element arranged on the first fixture can compress the circumferential edge of the battery cover plate on a mounting position on the second fixture. The fixing state of the battery cover plate is the same as the fixing state when the battery cover plate is assembled with the shell, and the high-pressure gas can act on the vast majority of the area of the battery cover plate and is close to the actual use condition of the battery cover plate, so that the obtained blasting value of the battery cover plate is close to the actual blasting value of the battery cover plate, and the test result is stable. Meanwhile, the circumferential edge of the battery cover plate can be well sealed with the first jig and the second jig through the sealing piece, the problem of gas leakage is avoided, and the accuracy of blasting value detection is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to a test fixture for a battery cover plate. Background Art

[0002] During the manufacturing process of a battery, it is necessary to conduct a bursting test on the battery cover plate to ensure that the battery cover plate meets the safety requirements during actual use.

[0003] During the test, generally, the battery cover plate is fixed on the test fixture, and then high-pressure gas is introduced from one side of the battery cover plate until the explosion-proof valve on the battery cover plate bursts. At this time, the bursting value of the battery cover plate is obtained. However, due to the relatively complex shape and structure of the battery cover plate, its edge position is not easy to fix, and the sealing effect is not good. Therefore, when the battery cover plate in the prior art is subjected to a bursting test, the fixing position is usually selected in the circumferential direction of the explosion-proof valve. The deviation between the bursting value of the battery cover plate measured by using this fixing method and the actual bursting value when the battery cover plate is assembled on the housing is relatively large, the measured data is inaccurate, and the measured bursting value is also unstable. How to accurately conduct a bursting test on the explosion-proof valve on the battery cover plate is a problem faced in the industry. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a test fixture for a battery cover plate, which can accurately measure the bursting value of the battery cover plate, the test result is accurate and stable, and is close to the actual bursting value when the actual battery cover plate is in use, and the test result is reliable.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a test fixture for a battery cover plate, including:

[0007] A first fixture, which is provided with an exhaust channel and an exhaust cavity that are communicated with each other. One end of the first fixture provided with the exhaust cavity is provided with a mounting groove, and a sealing member is arranged in the mounting groove;

[0008] A second fixture, which is provided with an air inlet channel and an air inlet cavity that are communicated with each other. One side of the second fixture provided with the air inlet cavity is provided with a mounting position for placing the battery cover plate, and the circumferential edge of the battery cover plate overlaps on the mounting position;

[0009] When the second fixture is buckled with the first fixture, the sealing member presses the circumferential edge of the battery cover plate against the mounting position.

[0010] Optionally, the longitudinal section of the installation groove is trapezoidal. The installation groove includes a first groove wall, a second groove wall, and a groove bottom. The first groove wall is located on the side close to the exhaust cavity. The second groove wall inclines away from the first groove wall, so that the notch of the installation groove shows a gradually shrinking trend. The groove bottom connects the first groove wall and the second groove wall.

[0011] Optionally, the seal is annular, and one end of the seal close to the first jig is clamped in the installation groove. One end of the seal close to the second jig extends out of the installation groove and can press the circumferential edge of the battery cover plate against the installation position.

[0012] Optionally, the seal and the installation groove are in clearance fit. The clearance between the seal and the first groove wall or the second groove wall is d, and the value range of d is 0.5mm - 0.8mm.

[0013] Optionally, the longitudinal section of the seal is trapezoidal. The seal includes a first side wall, a second side wall, a bottom wall, and a top wall. The first side wall is parallel to the first groove wall. The second side wall inclines away from the first side wall. The bottom wall is located in the installation groove, and the top wall is located outside the installation groove.

[0014] Optionally, the inclination angle of the second groove wall is α, and the value range of α is 50° - 70°;

[0015] And / or, the inclination angle of the second side wall is β, the value range of β is 50° - 70°, and β ≥ α.

[0016] Optionally, chamfers R are provided between the top wall and the first side wall, between the bottom wall and the first side wall, between the top wall and the second side wall, and between the bottom wall and the second side wall.

[0017] Optionally, the installation position includes a first step portion and a second step portion. The circumferential edge of the battery cover plate overlaps on the first step portion. One side of the seal facing the second jig abuts against the second step portion and the circumferential edge of the battery cover plate;

[0018] And / or, the first step portion includes a first wall surface and a second wall surface, the first wall surface is perpendicular to the second wall surface, and the circumferential edge of the battery cover plate overlaps on the first wall surface.

[0019] Optionally, the test jig for the battery cover plate includes a first air nozzle and a second air nozzle. The first air nozzle is connected to the exhaust passage, and the second air nozzle is connected to the intake passage.

[0020] Optionally, the test fixture for the battery cover plate further includes a guiding post. The first fixture is provided with a first guiding hole, and the second fixture is provided with a second guiding hole. Two ends of the guiding post are respectively inserted into the first guiding hole and the second guiding hole.

[0021] The beneficial effects of the present utility model are as follows:

[0022] The present utility model provides a test fixture for a battery cover plate, including a first fixture and a second fixture. The first fixture is provided with an exhaust passage and an exhaust cavity that communicate with each other. One end of the first fixture where the exhaust cavity is located is provided with a mounting groove, and a sealing member is arranged in the mounting groove. The second fixture is provided with an air inlet passage and an air inlet cavity that communicate with each other. One side of the second fixture where the air inlet cavity is located is provided with a mounting position for placing the battery cover plate, and the circumferential edge of the battery cover plate overlaps on the mounting position. When performing a bursting test, the second fixture is buckled and pressed against the first fixture. At this time, the sealing member presses the circumferential edge of the battery cover plate against the mounting position. This makes the fixing state of the battery cover plate the same as the fixing state when it is assembled with the housing, and high-pressure gas can act on most of the area on the side of the battery cover plate facing the battery cell, approaching the actual usage condition of the battery cover plate. Therefore, the bursting value of the battery cover plate obtained is close to the actual bursting value of the battery cover plate, and the test result is stable. At the same time, the sealing member can seal the circumferential edge of the battery cover plate with the first fixture and the second fixture well, avoiding the problem of gas leakage and ensuring the accuracy of the bursting value detection. Description of the Drawings

[0023] Figure 1 is an exploded view of the test fixture for the battery cover plate provided in the embodiment of the present utility model;

[0024] Figure 2 is a sectional view of the test fixture for the battery cover plate provided in the embodiment of the present utility model;

[0025] Figure 3 is Figure 2 a partial enlarged view of part A in

[0026] Figure 4 is a sectional view of the first fixture provided in the embodiment of the present utility model;

[0027] Figure 5 is Figure 4 a partial enlarged view of part B in

[0028] Figure 6 is a sectional view of the sealing member provided in the embodiment of the present utility model;

[0029] Figure 7 is a sectional view of the second fixture provided in the embodiment of the present utility model;

[0030] Figure 8 is Figure 7Partial enlarged view at position C in the figure.

[0031] In the figure:

[0032] 10. Battery cover plate; 11. Circumferential edge

[0033] 100. First fixture; 110. Exhaust passage; 120. Exhaust cavity; 130. Installation groove; 131. First groove wall; 132. Second groove wall; 133. Groove bottom; 140. First nozzle; 150. First guide hole; 160. Contact portion

[0034] 200. Second fixture; 210. Intake passage; 220. Intake cavity; 230. Installation position; 231. First step portion; 2311. First wall surface; 2312. Second wall surface; 232. Second step portion; 240. Second nozzle; 250. Second guide hole

[0035] 300. Sealing member; 310. First side wall; 320. Second side wall; 330. Bottom wall; 340. Top wall; 400. Guide post Detailed implementation manner

[0036] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figures 1 - 3 shown, this embodiment provides a test fixture for a battery cover plate, which includes a first fixture 100 and a second fixture 200. Among them, the first fixture 100 is provided with an exhaust passage 110 and an exhaust chamber 120 that communicate with each other. One end of the first fixture 100 where the exhaust chamber 120 is provided is provided with a mounting groove 130, and a sealing member 300 is arranged in the mounting groove 130. The second fixture 200 is provided with an air inlet passage 210 and an air inlet chamber 220 that communicate with each other. On one side of the second fixture 200 where the air inlet chamber 220 is provided, there is a mounting position 230 for placing the battery cover plate 10, and the circumferential edge 11 of the battery cover plate 10 overlaps on the mounting position 230.

[0041] When performing a bursting test, the second fixture 200 is buckled and pressed against the first fixture 100. At this time, the sealing member 300 connected to the first fixture 100 presses the circumferential edge 11 of the battery cover plate 10 tightly on the mounting position 230. Then, high-pressure gas is introduced into the air inlet passage 210. The high-pressure gas enters the air inlet chamber 220 through the air inlet passage 210. When the air pressure in the air inlet chamber 220 reaches the bursting value of the explosion-proof valve on the battery cover plate 10, the explosion-proof valve bursts, and the high-pressure gas enters the exhaust chamber 120 through the explosion-proof valve and then is discharged through the exhaust passage 110, thereby realizing the detection of the bursting value of the battery cover plate 10.

[0042] Since the sealing member 300 in this embodiment presses the circumferential edge 11 of the battery cover plate 10 tightly on the mounting position 230 of the second fixture 200, the fixing state of the battery cover plate 10 is the same as the fixing state when it is assembled with the housing. The high-pressure gas can act on most of the area of the battery cover plate 10 facing the side of the battery cell, approaching the actual usage condition of the battery cover plate 10. Therefore, the bursting value of the battery cover plate 10 obtained by using the above test fixture for the battery cover plate is close to the actual bursting value of the battery cover plate 10, and the test result is stable. At the same time, since the sealing member 300 can seal the circumferential edge 11 of the battery cover plate 10 with the first fixture 100 and the second fixture 200 well, avoiding the problem of gas leakage, the accuracy of the bursting value detection is ensured.

[0043] Continue to refer to Figure 4 、 Figure 5 and Figure 6, in this embodiment, the longitudinal section of the installation groove 130 is trapezoidal, where the longitudinal section refers to the section Figure 1 parallel to the X-Z plane in. The installation groove 130 includes a first groove wall 131, a second groove wall 132 and a groove bottom 133. The first groove wall 131 is located on the side close to the exhaust cavity 120. The second groove wall 132 is inclined away from the first groove wall 131, so that the notch of the installation groove 130 shows a gradually shrinking trend. The groove bottom 133 connects the first groove wall 131 and the second groove wall 132. The seal 300 is annular. By setting the notch of the installation groove 130 to have a gradually shrinking trend, one end of the seal 300 close to the first fixture 100 can be clamped in the installation groove 130, preventing the seal 300 from slipping out of the installation groove 130, and at the same time, it is relatively convenient for disassembly and assembly. Further, one end of the seal 300 close to the second fixture 200 extends out of the installation groove 130 and can press the circumferential edge 11 of the battery cover 10 against the installation position 230.

[0044] As an alternative solution, in this embodiment, the longitudinal section of the seal 300 is trapezoidal, where the longitudinal section refers to the section Figure 1 parallel to the X-Z plane in. The seal 300 includes a first side wall 310, a second side wall 320, a bottom wall 330 and a top wall 340. The first side wall 310 is parallel to the first groove wall 131. The second side wall 320 is inclined away from the first side wall 310. The bottom wall 330 of the seal 300 is snapped into the installation groove 130, and the top wall 340 of the seal 300 is located outside the installation groove 130. That is, along Figure 4 the Z-axis direction in, the height of the seal 300 is greater than the depth of the installation groove 130, so that the seal 300 can extend out of the installation groove 130 to abut against the circumferential edge 11 of the battery cover 10, and ensure that the seal 300 has a certain elastic deformation amount along its height direction ( Figure 6 the Z-axis direction shown in). The compression rate of the seal 300 can be 30%-40%. Optionally, the height of the seal 300 can be set to about 6 mm. When the height of the seal 300 is too small, problems are likely to occur in the sealing; when the height of the seal 300 is too large, the pressure required to press the first fixture 100 and the second fixture 200 is too large and it is not easy to achieve.

[0045] Exemplarily, in this embodiment, the inclination angle of the second groove wall 132 is α, and the value range of α is 50°-70°. For example, the inclination angle α of the second groove wall 132 can be 50°, 60°, 70°, etc. The inclination angle of the second side wall 320 is β, and the value range of β is 50°-70°. The inclination angle β of the second side wall 320 can be 50°, 60°, 70°, etc. In some embodiments, the inclination angle α of the second groove wall 132 can be equal to the inclination angle β of the second side wall 320. For example, both α and β are 60°. In some other embodiments, the inclination angle β of the second side wall 320 can also be set to be greater than the inclination angle α of the second groove wall 132, that is, β>α. For example, α is 55° and β is 60°. This setting can further ensure that the seal 300 is not easily disengaged from the installation groove 130 of the first fixture 100, and the fixing effect is better.

[0046] Optionally, a chamfer R is provided between the top wall 340 of the seal 300 and the first side wall 310, between the bottom wall 330 and the first side wall 310, between the top wall 340 and the second side wall 320, and between the bottom wall 330 and the second side wall 320. The radius of the chamfer R is 0.2 mm. By providing the chamfer R, it is convenient for the seal 300 to be demolded during manufacturing.

[0047] Further, continue to refer to Figure 2 and Figure 3 , in this embodiment, the seal 300 and the installation groove 130 are in clearance fit, and the clearance between the seal 300 and the first groove wall 131 or the second groove wall 132 is d. Here, the distance between the second side wall 320 of the seal 300 and the second groove wall 132 of the installation groove 130 is taken as an example to illustrate. The value range of d is 0.5 mm - 0.8 mm. For example, the value of d can be 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm. By providing a clearance between the seal 300 and the installation groove 130, it is to provide a deformation space for the seal 300. When the seal 300 is pressurized, the seal 300 can be deformed along its radial direction, and the radial direction of the seal 300 is the Figure 2 X-axis direction shown in

[0048] Optionally, a contact portion 160 is further provided on one side of the first fixture 100 where the installation groove 130 is located. The contact portion 160 can help the seal 300 to press against the circumferential edge 11 of the battery cover 10. Through the cooperation of the contact portion 160 and the seal 300, the gap between the first fixture 100 and the circumferential edge 11 of the battery cover 10 is well sealed. Exemplarily, the contact portion 160 can be an annular protrusion extending from the edge of the exhaust cavity 120 on the first fixture 100 towards the second fixture 200.

[0049] Refer to Figure 3 , Figure 7And Figure 8 In this embodiment, the mounting position 230 on the second fixture 200 includes a first step portion 231 and a second step portion 232. The circumferential edge 11 of the battery cover plate 10 overlaps on the first step portion 231, and one side of the seal 300 facing the second fixture 200 abuts against the second step portion 232 and the circumferential edge 11 of the battery cover plate 10. That is, the top wall 340 of the seal 300 abuts against the second step portion 232 and the circumferential edge 11 of the battery cover plate 10. Thus, the circumferential edge 11 of the battery cover plate 10 can be completely wrapped by the seal 300, so that the gap between the second fixture 200 and the battery cover plate 10 is completely sealed, avoiding the problem of gas leakage.

[0050] Optionally, the first step portion 231 in this embodiment includes a first wall surface 2311 and a second wall surface 2312, the first wall surface 2311 is perpendicular to the second wall surface 2312, and the circumferential edge 11 of the battery cover plate 10 overlaps on the first wall surface 2311. The first wall surface 2311 can provide good support for the battery cover plate 10, so that under the pressing action of the seal 300, the battery cover plate 10 can be stably fixed on the mounting position 230 of the second fixture 200. The second wall surface 2312 can play a role in radially limiting the circumferential edge 11 of the battery cover plate 10, where the radial direction refers to Figure 7 the X-axis direction in

[0051] Continue to refer to Figure 1 In this embodiment, the test fixture for the battery cover plate includes a first air nozzle 140 and a second air nozzle 240. The first air nozzle 140 is connected to the exhaust passage 110, and the second air nozzle 240 is connected to the intake passage 210. The high-pressure gas source and the intake passage 210 can be connected through the second air nozzle 240, and the exhaust passage 110 and the pressure detection device can be connected through the first air nozzle 140, thus forming a flow path for high-pressure gas. The pressure value of the high-pressure gas, that is, the bursting value of the battery cover plate, can be obtained through the pressure detection device.

[0052] Further, the test fixture for the battery cover plate further includes a guiding column 400. The first fixture 100 is provided with a first guiding hole 150, and the second fixture 200 is provided with a second guiding hole 250. Two ends of the guiding column 400 respectively extend into the first guiding hole 150 and the second guiding hole 250. Through the cooperation of the guiding column 400 with the first guiding hole 150 and the second guiding hole 250, the alignment between the first fixture 100 and the second fixture 200 can be made accurate, ensuring that the seal 300 on the first fixture 100 can tightly press the circumferential edge 11 of the battery cover plate 10 onto the installation position 230 of the second fixture 200, thereby ensuring good sealing between the battery cover plate 10, the first fixture 100, and the second fixture 200, and helping to improve the accuracy of the burst value test result. Exemplarily, the first guiding hole 150 may be a through hole, and the second guiding hole 250 may be a blind hole. Of course, both the first guiding hole 150 and the second guiding hole 250 may also be blind holes.

[0053] Optionally, the guiding column 400, the first guiding hole 150, and the second guiding hole 250 may be provided in multiple numbers, and the guiding column 400, the first guiding hole 150, and the second guiding hole 250 correspond to each other one by one. The first guiding holes 150 are uniformly and spacedly arranged in the circumferential direction of the exhaust cavity 120, and the second guiding holes 250 are uniformly and spacedly arranged in the circumferential direction of the intake cavity 220. Exemplarily, in this embodiment, four guiding columns 400, four first guiding holes 150, and four second guiding holes 250 are taken as an example for illustration. Of course, in other embodiments, the guiding column 400, the first guiding hole 150, and the second guiding hole 250 may also be provided in other numbers, which will not be listed one by one here.

[0054] Further, the test fixture for the battery cover plate in this embodiment has multiple uses. It can not only be used to detect the burst value of the battery cover plate 10, but also be used as a test fixture for helium leak detection. The difference is that at this time, helium needs to be introduced into the intake cavity 220 through the second nozzle 240, and the first nozzle 140 is connected to a helium detection device, and the helium detection device is used to detect whether there is helium entering the exhaust cavity 120, so as to determine whether the sealing performance of the battery cover plate 10 is good.

[0055] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A test fixture for a battery cover plate, characterized in that Including: A first fixture (100) is provided with an exhaust passage (110) and an exhaust cavity (120) that communicate with each other. One end of the first fixture (100) where the exhaust cavity (120) is provided is provided with a mounting groove (130), and a sealing member (300) is arranged in the mounting groove (130); A second fixture (200) is provided with an air inlet passage (210) and an air inlet cavity (220) that communicate with each other. One side of the second fixture (200) where the air inlet cavity (220) is provided is provided with a mounting position (230) for placing a battery cover plate (10), and the circumferential edge (11) of the battery cover plate (10) overlaps on the mounting position (230); When the second fixture (200) is buckled with the first fixture (100), the sealing member (300) presses the circumferential edge (11) of the battery cover plate (10) against the mounting position (230).

2. The test fixture for the battery cover plate according to claim 1, wherein, The longitudinal section of the mounting groove (130) is trapezoidal. The mounting groove (130) includes a first groove wall (131), a second groove wall (132) and a groove bottom (133). The first groove wall (131) is located on the side close to the exhaust cavity (120), and the second groove wall (132) inclines away from the first groove wall (131) so that the notch of the mounting groove (130) shows a gradually shrinking trend, and the groove bottom (133) connects the first groove wall (131) and the second groove wall (132).

3. The test fixture for the battery cover plate according to claim 2, wherein The sealing member (300) is annular, and one end of the sealing member (300) close to the first fixture (100) is clamped in the mounting groove (130), and one end of the sealing member (300) close to the second fixture (200) extends out of the mounting groove (130) and can press the circumferential edge (11) of the battery cover plate (10) against the mounting position (230).

4. The test fixture for the battery cover plate according to claim 3, characterized in that, The sealing member (300) and the mounting groove (130) are in clearance fit, and the clearance between the sealing member (300) and the first groove wall (131) or the second groove wall (132) is d, and the value range of d is 0.5 mm - 0.8 mm.

5. The test fixture for the battery cover plate according to claim 3, characterized in that, The longitudinal section of the sealing member (300) is trapezoidal. The sealing member (300) includes a first side wall (310), a second side wall (320), a bottom wall (330) and a top wall (340). The first side wall (310) is parallel to the first groove wall (131), the second side wall (320) inclines away from the first side wall (310), the bottom wall (330) is located in the mounting groove (130), and the top wall (340) is located outside the mounting groove (130).

6. The test fixture for the battery cover plate according to claim 5, wherein The inclination angle of the second groove wall (132) is α, and the value range of α is 50° - 70°; And / or, the inclination angle of the second side wall (320) is β, the value range of β is 50° - 70°, and β ≥ α.

7. The test fixture for the battery cover plate according to claim 5, characterized in that, A chamfer R is provided between the top wall (340) and the first side wall (310), between the bottom wall (330) and the first side wall (310), between the top wall (340) and the second side wall (320), and between the bottom wall (330) and the second side wall (320).

8. The test fixture for the battery cover plate according to claim 1, wherein, The mounting position (230) includes a first stepped portion (231) and a second stepped portion (232). The circumferential edge (11) of the battery cover plate (10) overlaps the first stepped portion (231), and one side of the seal (300) facing the second jig (200) abuts against the second stepped portion (232) and the circumferential edge (11) of the battery cover plate (10). And / or, the first stepped portion (231) includes a first wall surface (2311) and a second wall surface (2312). The first wall surface (2311) is perpendicular to the second wall surface (2312), and the circumferential edge (11) of the battery cover plate (10) overlaps the first wall surface (2311).

9. The test fixture for the battery cover plate according to any one of claims 1-8, characterized in that, The test jig for the battery cover plate includes a first air nozzle (140) and a second air nozzle (240). The first air nozzle (140) is connected to the exhaust passage (110), and the second air nozzle (240) is connected to the intake passage (210).

10. The test fixture for the battery cover plate according to any one of claims 1-8, characterized in that, The test jig for the battery cover plate further includes a guide post (400). The first jig (100) is provided with a first guide hole (150), and the second jig (200) is provided with a second guide hole (250). Both ends of the guide post (400) extend into the first guide hole (150) and the second guide hole (250) respectively.

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