Universal clamp for mechanical performance test of battery pack

Abstract

The utility model relates to a battery pack mechanical performance test universal clamp which is used for being installed on a test bed and comprises a cross beam, the cross beam is located above the test bed, the middle of the cross beam is connected with a middle fixing point of a battery pack, and the two ends of the cross beam are connected with a first fixing seat and a second fixing seat which are arranged side by side in the length direction of the cross beam. And the fixed seat I and the fixed seat II are both mounted on the test bed. The two ends of the cross beam are connected with the test bench through the first fixing seat and the second fixing seat, the second fixing seat provides stable supporting for the cross beam, the first fixing seat reduces the supporting span of the cross beam, the rigidity of the test clamp in the X direction is improved, it is ensured that the first-order frequency of the test clamp is larger than 200 Hz, and the test efficiency is improved. And the failure risk caused by insufficient rigidity of the test clamp when the battery pack vibrates is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a universal fixture for mechanical performance testing of a battery pack. Background Art

[0002] In order to test the various indicators of the battery pack, the battery pack needs to be tested for mechanical reliability and safety. At present, for battery packs with fixed points in the middle (the middle fixed point is used to connect to the whole vehicle), when doing mechanical reliability and safety tests, at least two types of tooling equipment are usually designed to assist in completing the test. One type of tooling fixture is used for random vibration, mechanical shock, simulated collision and other tests, and the other type of tooling fixture is used for bottom ball hitting and other tests, which increases the test cost of the battery pack. In addition, in the vibration test, in order to simulate the installation method of the battery pack on the whole vehicle, the battery pack needs to be fixed on the vibration table with a tooling fixture. In order to ensure that the vibration of the vibration table can be rigidly transmitted to the battery pack, the fixture must be subjected to a frequency sweep test before the test, and its first-order resonance frequency must be greater than the maximum frequency of the test (200Hz). However, the tooling fixtures used for battery pack tests with fixed points in the middle currently have a first-order frequency lower than 200Hz. According to the national standard, the frequency range of the random vibration PSD spectrum is 0-200Hz. If the first-order frequency of the tooling is lower than 200Hz, the probability of vibration failure of the battery pack will increase. Utility Model Content

[0003] Based on this, it is necessary to address the technical problem that the current tooling fixtures used for battery pack testing with a fixed point in the middle all have a first-order frequency lower than 200Hz. If the first-order frequency of the tooling is lower than 200Hz, the probability of vibration failure of the battery pack will increase. The utility model proposes a universal fixture for mechanical property testing of battery packs.

[0004] The utility model proposes a universal fixture for mechanical performance testing of a battery pack, which is used for being installed on a test bench, and comprises a crossbeam, which is located above the test bench and whose middle part is connected to the middle fixed point of the battery pack, and both ends of the crossbeam are connected to a fixing seat 1 and a fixing seat 2 which are arranged side by side in the length direction thereof, and both fixing seat 1 and fixing seat 2 are installed on the test bench.

[0005] The utility model is connected to the test bench at both ends of the beam through a fixing seat 1 and a fixing seat 2, wherein the fixing seat 2 provides stable support for the beam, and the fixing seat 1 reduces the support span of the beam, thereby improving the X-direction stiffness of the test fixture, ensuring that the first-order frequency of the test fixture is greater than 200 Hz, and greatly reducing the risk of failure caused by insufficient stiffness of the test fixture when the battery pack vibrates.

[0006] As a further improvement of the above scheme of the utility model, the crossbeam is a symmetrical structure, and the crossbeam includes a support plate and two side plates; the width of the support plate gradually decreases from both ends to the middle, and the support plate is connected to the middle fixing point of the battery pack, the first fixing seat, and the second fixing seat by bolts; the bottoms of the two side plates are respectively welded to both sides of the support plate in the length direction, and the two side plates are symmetrically arranged about the central axis in the length direction of the support plate.

[0007] As a further improvement of the above scheme of the utility model, the side panel is a symmetrical structure, and the side panel includes side panel one, two side panels two and two side panels three. The two side panels two are respectively welded to the two ends of the side panel one and the two side panels two are symmetrically arranged about the side panel one. The ends of the two side panels two away from the side panel one are welded to a side panel three and the two side panels three are symmetrically arranged about the side panel one.

[0008] As a further improvement of the above scheme of the utility model, two groups of connecting parts are arranged between the two side panels, and the two groups of connecting parts are symmetrically arranged about the central axis in the width direction of the support plate. Each connecting part includes a plurality of connecting plates arranged in parallel and spaced apart. The two ends of the connecting plate are respectively welded to the two side panels and the bottom thereof is welded to the support plate.

[0009] As a further improvement of the above scheme of the utility model, the fixing seat 1 is connected to the test bench through a mounting piece, the fixing seat 2 is connected to the test bench through bolts, the mounting piece includes a fixing plate 1 and a fixing plate 2; the fixing plate 1 is connected to the test bench through bolts, and a plurality of fixing plates 3 arranged vertically opposite to each other are welded on the fixing plate 1; the fixing plate 2 is arranged parallel to the fixing plate 1 and is connected to the plurality of fixing plates 3 through bolts, and the fixing plate 2 is connected to the battery pack through bolts; the fixing seat 1 is welded to the top surface of the fixing plate 2.

[0010] As a further improvement of the above-mentioned solution of the utility model, the universal fixture for mechanical performance testing of the battery pack also includes two fixing parts 1 and two fixing parts 2 installed on the test bench and connected to the battery pack, the two fixing parts 1 are arranged on one side of the beam, and the two fixing parts 2 are arranged on the other side of the beam.

[0011] As a further improvement of the above scheme of the utility model, the fixing member 1 includes a fixing plate 4 and a fixing plate 5, the fixing plate 4 is connected to the test bench by bolts, two fixing plates 6 arranged vertically opposite to each other are welded to the fixing plate 4, the fixing plate 5 is arranged parallel to the fixing plate 4 and is connected to the two fixing plates 6 by bolts, and the fixing plate 5 is connected to the battery pack by bolts.

[0012] As a further improvement of the above scheme of the utility model, the fixing part 2 includes a fixing plate 7 and a fixing plate 8, the fixing plate 7 is connected to the test bench by bolts, two fixing plates 9 arranged vertically opposite to each other are welded to the fixing plate 7, the fixing plate 8 is arranged parallel to the fixing plate 7 and is connected to the two fixing plates 9 by bolts, and the fixing plate 8 is connected to the battery pack by bolts.

[0013] As a further improvement of the above solution of the utility model, the crossbeam, the first fixing seat, the second fixing seat, the first fixing piece and the second fixing piece are all made of aluminum alloy material.

[0014] As a further improvement of the above solution of the utility model, a plurality of screw holes distributed in a matrix and with a hole spacing of 100*100mm are opened on the fixing plate 1, the fixing seat 2, the fixing plate 4 and the fixing plate 7.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model is connected to the test bench at both ends of the beam through a fixing seat 1 and a fixing seat 2, wherein the fixing seat 2 provides stable support for the beam, and the fixing seat 1 reduces the support span of the beam, thereby improving the X-direction stiffness of the test fixture and ensuring that the first-order frequency of the test fixture is greater than 200 Hz, thereby greatly reducing the risk of failure caused by insufficient stiffness of the test fixture when the battery pack vibrates.

[0017] 2. The structural setting of the crossbeam of the utility model further improves the X-direction rigidity of the test fixture and further ensures that the first-order frequency of the test equipment is greater than 200 Hz.

[0018] 3. The universal fixture for mechanical property test of battery pack proposed by the utility model can be used for random vibration test, mechanical impact test, simulated collision test and bottom ball impact test of battery pack, and can be compatible with the equipment table of conventional test in the industry, thus reducing the cost of battery pack test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a universal fixture for mechanical performance testing of a battery pack is provided for the embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of a crossbeam in a universal fixture for mechanical performance testing of a battery pack is provided for an embodiment of the utility model;

[0021] Figure 3 A structural schematic diagram of a fixing seat 1 in a universal fixture for mechanical performance testing of a battery pack is provided for an embodiment of the utility model;

[0022] Figure 4 A structural schematic diagram of a fixing seat 2 in a universal fixture for mechanical performance testing of a battery pack is provided for an embodiment of the utility model;

[0023] Figure 5 A structural schematic diagram of a fixing member 1 in a universal fixture for mechanical performance testing of a battery pack is provided for an embodiment of the utility model;

[0024] Figure 6 A structural schematic diagram of a fixing component 2 in a universal fixture for mechanical performance testing of a battery pack is provided for an embodiment of the utility model.

[0025] Figure numerals: 1. test bench; 2. crossbeam; 21. support plate; 22. side plate; 24. connecting plate; 3. fixing seat one; 4. fixing seat two; 5. mounting part; 51. fixing plate one; 52. fixing plate two; 53; fixing plate three; 6. fixing part one; 61. fixing plate four; 62. fixing plate five; 63. fixing plate six; 7. fixing part two; 71. fixing plate seven; 72. fixing plate eight; 73. fixing plate nine. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] This embodiment provides a universal fixture for mechanical performance test of battery pack, which is used for performance test of battery pack, and the performance test includes random vibration test, mechanical impact test, simulated collision test and bottom ball impact test. The universal fixture for mechanical performance test of battery pack in this embodiment includes a crossbeam 2, and may also include two fixing members 1 6 and two fixing members 2 7.

[0028] Combination Figure 2In this embodiment, the crossbeam 2 is a symmetrical structure as a whole, and the crossbeam 2 includes a support plate 21, two side plates 22 and two sets of connecting parts. The support plate 21 is a symmetrical structure, and the width of the support plate 21 gradually decreases from the two ends to the middle. Two symmetrically arranged screw holes are opened in the middle of the support plate 21. The distance between the two screw holes is set according to the middle fixing point of the battery pack. The connection between the crossbeam and the battery pack is achieved by bolts at the positions of the two screw holes. The bottoms of the two side plates 22 are respectively welded to the two sides of the length direction of the support plate 21, and the two side plates 22 are symmetrically arranged about the central axis of the length direction of the support plate 21. In this embodiment, each side plate 22 includes a side plate 22-1, two side plates 22-2 and two side plates 22-3. The two side plates 22-2 are respectively welded to the two ends of the side plate 22-1 and the two side plates 22-2 are symmetrically arranged about the side plate 22-1. The ends of the two side plates 22-2 away from the side plate 22-1 are welded to a side plate 22-3 and the two side plates 22-3 are symmetrically arranged about the side plate 22-1. Two groups of connecting parts are arranged between the two side plates 22 and are symmetrically arranged about the central axis in the width direction of the support plate 21. Each connecting part includes a plurality of connecting plates 23 arranged in parallel and spaced apart. The two ends of the connecting plates 23 are respectively welded to the two side plates 22 and the bottom is welded to the support plate 21. The crossbeam 2 of this embodiment is formed by welding of plates and does not need to be disassembled for subsequent use, thereby reducing the difficulty of installation and improving the test efficiency. Compared with bolt connection, it avoids the phenomenon of loose connection during use that causes the rigidity of the tooling to decrease. At the same time, it replaces the traditional crossbeam 2 formed by milling of aluminum blocks, greatly reducing the cost.

[0029] Both ends of the beam 2 are connected with a fixing seat 1 3 and a fixing seat 2 4 by bolts, and the fixing seat 1 3 and the fixing seat 2 4 are connected to the test bench 1. The fixing seat 2 4 is arranged outside the fixing seat 1 3. The fixing seat 2 4 provides stable support for the beam 2. The fixing seat 1 3 is used to reduce the support span of the beam 2. Figure 3 , Figure 4In this embodiment, the fixing seat 1 3 is connected to the test bench 1 through a mounting part, wherein the mounting part includes a fixing plate 1 51 and a fixing plate 2 52, a plurality of screw holes are provided on the fixing plate 1 51 and connected to the test bench 1 through bolts, a plurality of fixing plates 3 53 arranged vertically opposite to each other are welded on the fixing plate 1 51, and the fixing plate 2 52 is arranged in parallel with the fixing plate 1 51 and connected to the plurality of fixing plates 3 53 through bolts. The fixing seat 1 3 is welded to the top surface of the fixing plate 2 52, a plurality of screw holes are provided on the fixing seat 1 3 and connected to the support plate 21 through bolts. The fixing seat 2 4 has a plurality of screw holes at the bottom and is directly connected to the test bench 1 through bolts, and a plurality of screw holes are also provided at the top of the fixing seat 2 4 and is connected to the support plate 21 through bolts. The positions of the fixing seat 1 3 and the fixing seat 2 4 on the test bench 1 can be adjusted according to different battery packs. The fixing plate 1 51 and the fixing plate 3 53, and the fixing seat 1 3 and the fixing plate 2 52 are all welded. Except for the first assembly, they do not need to be disassembled for subsequent use, thereby reducing the difficulty of installation and improving the test efficiency. Compared with bolt connection, it avoids the phenomenon of loose connection during use, which leads to a decrease in tooling rigidity. In this embodiment, a plurality of screw holes are opened on the fixing plate 2 52 and connected to the mounting point of the battery pack in the X direction by bolts.

[0030] The above structural arrangement of the present embodiment connects the middle fixing point of the battery pack to the support plate 21 by bolts when fixing the battery pack, and two fixing structures are arranged at both ends of the crossbeam 2, thereby improving the stiffness in the X direction (the X direction is the X direction of the whole vehicle), ensuring that the first-order frequency of the test equipment is greater than 200 Hz, and greatly reducing the risk of failure caused by insufficient stiffness of the test equipment when the battery pack vibrates.

[0031] It should be noted that grooves can be provided on the fixing seat 1 3 and the fixing seat 2 4. The grooves can reduce the weight of the fixture, save materials, and reduce manufacturing costs. The fixing seat 1 3 can be formed by welding aluminum plates, and the fixing seat 2 4 can be formed by milling aluminum blocks.

[0032] Two fixing members 6 are arranged on one side of the cross beam 2, combined with Figure 5The fixing part 6 includes a fixing plate four 61 and a fixing plate five 62. The fixing plate four 61 is provided with a plurality of screw holes and is connected to the test bench 1 by bolts. The position of the fixing part 6 on the test bench 1 can be adjusted according to different battery packs. Two fixing plates six 63 arranged vertically opposite to each other are welded to the fixing plate four 61. The fixing plate five 62 is arranged parallel to the fixing plate four 61 and is connected to the two fixing plates six 63 by bolts. The fixing plate five 62 is provided with a screw hole on the side close to the crossbeam and is connected to the mounting point of the battery pack in the Y direction by bolts at the screw hole. The fixing plate four 61 and the fixing plate six 63 adopt a welded structure. Except for the first assembly, they do not need to be disassembled for subsequent use, thereby reducing the difficulty of installation and improving the test efficiency. Compared with the bolt connection, it avoids the phenomenon of loose connection during use resulting in a decrease in the stiffness of the tooling.

[0033] Two fixing members 7 are arranged on the other side of the crossbeam 2, combined with Figure 6 The fixing part 27 includes a fixing plate 71 and a fixing plate 8 72. The fixing plate 71 is provided with a plurality of screw holes and is connected to the test bench 1 by bolts. The position of the fixing part 27 on the test bench 1 can be adjusted according to different battery packs. Two fixing plates 9 73 arranged vertically opposite to each other are welded to the fixing plate 71. The fixing plate 8 72 is arranged parallel to the fixing plate 71 and is connected to the two fixing plates 9 73 by bolts. The fixing plate 8 72 is provided with a screw hole on the side close to the crossbeam and is connected to the mounting point of the battery pack in the Y direction by bolts at the screw hole. The fixing plate 71 and the fixing plate 9 73 adopt a welded structure. Except for the first assembly, they do not need to be disassembled for subsequent use, thereby reducing the difficulty of installation and improving the test efficiency. Compared with the bolt connection, it avoids the phenomenon of loose connection during use, which leads to a decrease in the rigidity of the tooling.

[0034] It should be noted that due to different test equipment in the industry, the spacing between the connecting screw holes of the test bench 1 will be different, some are 100mm*100mm, and some are 200mm*200mm. In order to be compatible with all random vibration test benches, mechanical shock test benches, simulated collision test benches, and bottom ball impact test benches in the industry, the multiple screw holes on the fixed plate 1 51, the fixed seat 2 4, the fixed plate 4 61, and the fixed plate 7 71 of this embodiment have a spacing of 100mm*100mm, which is compatible with the equipment test benches for conventional tests in the industry, and can be used for random vibration, mechanical shock, simulated collision, bottom ball impact and other working conditions.

[0035] Next, the working principle of this embodiment is explained: first, the middle fixing point of the battery pack is fixedly connected to the middle of the support plate 21 by bolts, and then the distance between the two fixing seats 1 3 and the two fixing seats 2 4 is adjusted according to the size of the battery pack, and the fixing plate 2 52 is connected to the mounting points on both sides of the battery pack X by bolts, and the fixing seat 1 3 and the fixing seat 2 4 are connected to the support plate 21 by bolts; then the assembled battery pack is hoisted onto the test bench 1 by a hoist, and the fixing seat 2 4 and the fixing plate 1 51 are connected to the test bench 1 by bolts; then the positions of the fixing parts 1 and 2 on the test bench 1 are adjusted according to the size of the battery pack, and the fixing plates 4 61 and 71 are fixed to the test bench 1 by bolts, and the fixing plates 5 62 and 8 72 are connected to the mounting points on both sides of the battery pack Y by bolts, and the mechanical properties test of the battery pack can be carried out.

[0036] It should be noted that the overall material of the universal fixture for testing the mechanical properties of battery packs in this embodiment is aluminum alloy, which is lightweight, convenient for transportation and storage, and greatly reduces the cost of equipment.

[0037] It should be noted that wire thread sleeves can be installed in the screw holes in the universal fixture for the battery pack mechanical properties test of this embodiment, which increases the number of times the threads can be used and reduces the probability of some structural parts being scrapped due to thread damage. At the same time, it improves the connection stiffness and ensures the continuity of the test.

[0038] It should be noted that in other embodiments, the connection between the fixing seat 2 4, the fixing plate 1 51, the fixing plate 4 61 and the fixing plate 7 71 and the test bench 1 may also select other structures that have a fastening function and are detachable, such as a snap connection, a quick pin connection, etc.

[0039] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A universal fixture for mechanical performance testing of a battery pack, used for installation on a test bench (1), characterized in that: The cross beam (2) comprises a cross beam (2), the cross beam (2) being located above the test bench (1) and the middle of which is connected to the middle fixed point of the battery pack, the two ends of the cross beam (2) being connected to a first fixing seat (3) and a second fixing seat (4) arranged side by side in the length direction thereof, and the first fixing seat (3) and the second fixing seat (4) being installed on the test bench (1).

2. The universal fixture for battery pack mechanical performance testing according to claim 1, characterized in that: The crossbeam (2) is a symmetrical structure, comprising a support plate (21) and two side plates (22); the width of the support plate (21) gradually decreases from both ends to the middle, and the support plate (21) is connected to the middle fixing point of the battery pack, the first fixing seat (3), and the second fixing seat (4) by bolts; the bottoms of the two side plates (22) are respectively welded to both sides of the support plate (21) in the length direction, and the two side plates (22) are symmetrically arranged about the central axis of the support plate (21) in the length direction.

3. The universal fixture for battery pack mechanical performance testing according to claim 2, characterized in that: The side plate (22) is a symmetrical structure, and the side plate (22) comprises a side plate (22) 1, two side plates (22) 2 and two side plates (22) 3. The two side plates (22) 2 are respectively welded to the two ends of the side plate (22) 1 and the two side plates (22) 2 are symmetrically arranged with respect to the side plate (22) 1. One end of the two side plates (22) 2 away from the side plate (22) 1 is welded to a side plate (22) 3 and the two side plates (22) 3 are symmetrically arranged with respect to the side plate (22) 1.

4. The universal fixture for battery pack mechanical performance testing according to claim 2, characterized in that: Two groups of connecting members are arranged between the two side plates (22), and the two groups of connecting members are symmetrically arranged about the central axis in the width direction of the support plate (21). Each connecting member comprises a plurality of connecting plates (23) arranged in parallel and spaced apart. The two ends of the connecting plates (23) are respectively welded to the two side plates (22) and the bottom thereof is welded to the support plate (21).

5. The universal fixture for battery pack mechanical performance testing according to claim 1, characterized in that: The fixing seat 1 (3) is connected to the test bench (1) through the mounting member (5), and the fixing seat 2 (4) is connected to the test bench (1) through bolts; the mounting member (5) comprises a fixing plate 1 (51) and a fixing plate 2 (52); the fixing plate 1 (51) is connected to the test bench (1) through bolts; a plurality of fixing plates 3 (53) arranged vertically opposite to each other are welded to the fixing plate 1 (51); the fixing plate 2 (52) is arranged parallel to the fixing plate 1 (51) and is connected to the plurality of fixing plates 3 (53) through bolts; the fixing plate 2 (52) is connected to the battery pack through bolts; the fixing seat 1 (3) is welded to the top surface of the fixing plate 2 (52).

6. The universal fixture for battery pack mechanical performance testing according to claim 5, characterized in that: The universal fixture for testing the mechanical properties of a battery pack also includes two fixing members 1 (6) and two fixing members 2 (7) mounted on the test bench (1) and connected to the battery pack, wherein the two fixing members 1 (6) are arranged on one side of the crossbeam (2), and the two fixing members 2 (7) are arranged on the other side of the crossbeam (2).

7. The universal fixture for battery pack mechanical performance testing according to claim 6, characterized in that: The fixing member 1 (6) includes a fixing plate 4 (61) and a fixing plate 5 (62), wherein the fixing plate 4 (61) is connected to the test bench (1) by bolts, and two fixing plates 6 (63) arranged vertically opposite to each other are welded to the fixing plate 4 (61), and the fixing plate 5 (62) is arranged parallel to the fixing plate 4 (61) and connected to the two fixing plates 6 (63) by bolts, and the fixing plate 5 (62) is connected to the battery pack by bolts.

8. The universal fixture for battery pack mechanical performance testing according to claim 7, characterized in that: The fixing member 2 (7) comprises a fixing plate 7 (71) and a fixing plate 8 (72), the fixing plate 7 (71) being connected to the test bench (1) by bolts, two fixing plates 9 (73) arranged vertically opposite to each other are welded to the fixing plate 7 (71), the fixing plate 8 (72) is arranged parallel to the fixing plate 7 (71) and connected to the two fixing plates 9 (73) by bolts, and the fixing plate 8 (72) is connected to the battery pack by bolts.

9. The universal fixture for battery pack mechanical performance testing according to claim 6, characterized in that: The crossbeam (2), the first fixing seat (3), the second fixing seat (4), the first fixing piece (6) and the second fixing piece (7) are all made of aluminum alloy material.

10. The universal fixture for battery pack mechanical performance testing according to claim 8, characterized in that: A plurality of screw holes distributed in a matrix with a hole spacing of 100*100 mm are provided on the fixing plate 1 (51), the fixing seat 2 (4), the fixing plate 4 (61) and the fixing plate 7 (71).

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