Impact tool and battery pack impact system

Abstract

The utility model relates to the technical field of battery testing, in particular to an impact tool and a battery pack impact system. The impact tool comprises a support, the support is provided with at least three installation faces, every two adjacent installation faces are perpendicular to each other, and the installation faces can be fixedly connected with the impact test bed and / or the battery pack. The impact tool provided by the utility model can be used for the impact test of the battery pack, and through arranging at least three mounting surfaces on the bracket, when the impact test is carried out, one of the mounting surfaces can be used for being fixedly connected with an impact test bench, and the other mounting surfaces are used for fixedly mounting the battery pack, so that a plurality of battery packs can be tested at the same time; the test efficiency can be improved; meanwhile, two adjacent mounting surfaces are perpendicular to each other, so that impact tests in X, Y and Z directions can be compatibly realized on an impact test bed which can only perform single-direction impact by adjusting the mounting direction and the mounting position of the battery pack, and the impact test bed is convenient to use and good in applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to an impact tool and a battery pack impact system. Background Art

[0002] Before the battery is officially shipped out of the factory, a series of safety performance tests are required to simulate the various environments encountered when the battery pack is mounted on the vehicle and used, to verify whether the battery can work normally. Among them, the impact test is used to simulate the mechanical structural stability of the battery pack when it is subjected to external impact, especially to simulate the impact of adverse conditions such as bumps and vibrations on the battery pack structure when the vehicle encounters bumpy road conditions (such as speed bumps or potholes) during driving. By processing and analyzing the samples after the test, the impact resistance and safety performance of the battery can be effectively evaluated. And through the impact test, the design defects of the sample can be quickly found to help improve the structural design of the battery, thereby ensuring that the battery can maintain structural safety when subjected to external impact and improving the safety of vehicle driving.

[0003] The current impact fixture technology has limited installation positions for battery packs, and most of them can only withstand impacts in a certain fixed direction. The installation position of the impact fixture needs to be frequently adjusted, which makes testing very cumbersome. Utility Model Content

[0004] The purpose of the invention of the utility model is to provide an impact tool and a battery pack impact system to address the problems existing in the prior art, which can be compatible with the installation and testing of battery packs in three directions of X / Y / Z, is easy to use and can improve the testing efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An impact tool comprises a bracket, wherein the bracket has at least three mounting surfaces, two adjacent mounting surfaces are perpendicular to each other, and the mounting surfaces can be fixedly connected to an impact test bench and / or a battery pack.

[0007] The impact tooling provided in the present application can be used for impact testing of battery packs. By setting at least three mounting surfaces on the bracket, when performing the impact test, one of the mounting surfaces can be used to be fixedly connected to the impact test bench, and the other at least two mounting surfaces can be used to fix and install the battery pack, so that multiple battery packs can be tested at the same time, which is conducive to improving the test efficiency;

[0008] At the same time, since the two adjacent mounting surfaces are perpendicular to each other, by adjusting the mounting direction and mounting position of the battery pack, impact testing in three directions of X / Y / Z can be achieved on an impact test bench that can only perform impact in a single direction. It is easy to use and has good applicability.

[0009] As a preferred solution of the utility model, the bracket is formed by welding square tube components.

[0010] The square tube is light in weight and high in strength. It is not only easy to install and use, but also can meet the strength requirements of the impact test. The sides of the square tube are relatively flat and can be easily fixed to the impact test bench or battery pack.

[0011] As a preferred solution of the utility model, the bracket is a regular hexahedron, and the square tube assembly includes side bars and oblique bars, the side bars are located on the edges of the bracket, and the oblique bars are located on the diagonal lines of the bracket surface.

[0012] The frame structure formed by the side bars and diagonal bars has high structural strength and good structural stability, meeting the impact test requirements of 0-150g.

[0013] The present application also provides a battery pack impact system, including a battery pack, an impact test bench and the impact tooling as described above, wherein the bracket is fixedly connected to the impact test bench via a mounting surface, and the battery pack is fixed on the mounting surface.

[0014] The battery pack impact system provided in the present application can perform impact tests on multiple battery packs at the same time by using the above-mentioned impact tooling, which is beneficial to improving the test efficiency; at the same time, it reduces the functional requirements for the impact test bench, and can be compatible with impact tests in three directions of X / Y / Z on an impact test bench that can only perform impact in a single direction. It is easy to use and has good applicability.

[0015] As a preferred solution of the utility model, the battery pack impact system also includes a seat plate and a limit assembly, the seat plate is fixed on the mounting surface, the limit assembly is fixed on the seat plate, and the limit assembly can fix the battery pack.

[0016] The seat plate and limit assembly are provided to facilitate the installation and fixation of the battery pack.

[0017] As a preferred solution of the utility model, at least two first bolt holes are provided on the mounting surface, at least two second bolt holes are provided on the seat plate, and the seat plate is bolted to the mounting surface;

[0018] and / or,

[0019] At least two third bolt holes are arranged on the seat plate, at least two fourth bolt holes are arranged on the limiting assembly, and the limiting assembly is connected with the seat plate by bolts.

[0020] Bolt connection has the characteristics of easy installation and disassembly and good fastening effect.

[0021] As a preferred solution of the present invention, the limiting assembly includes at least 4 limiting bars, and at least part of the limiting bars enclose the battery pack.

[0022] As a preferred solution of the utility model, a wedge-shaped piece is provided at the lower part of the side of the battery pack, and a limiting slope is provided on the side of at least part of the limiting strip, the limiting slope is adapted to the upper surface of the wedge-shaped piece, and the limiting slope can lock the battery pack.

[0023] The cooperation between the limit strip and the wedge-shaped piece can effectively pre-tighten the battery pack and prevent the battery pack from relative slipping during the impact process.

[0024] As a preferred solution of the utility model, the number of mounting surfaces is 4, and all mounting surfaces are connected end to end.

[0025] It is easy to set up, and can simultaneously install and test two battery packs in the ±Z direction and one battery pack in the ±X direction, or simultaneously install and test three battery packs in the ±Y direction to meet test needs.

[0026] As a preferred solution of the utility model, the number of the mounting surfaces is 4, and all the mounting surfaces include 3 mounting surfaces that are adjacent to each other.

[0027] It is easy to set up, and can simultaneously install and test a battery pack in the ±Z direction, a battery pack in the ±X direction, and a battery pack in the ±Y direction to meet testing needs.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0029] 1. The impact tooling provided in the present application can be used for impact testing of battery packs. By setting at least three mounting surfaces on the bracket, when performing an impact test, one of the mounting surfaces can be used to be fixedly connected to the impact test bench, and the other at least two mounting surfaces are used to fix the battery pack, so that multiple battery packs can be tested at the same time, which is beneficial to improving the test efficiency. At the same time, since two adjacent mounting surfaces are perpendicular to each other, the installation direction and installation position of the battery pack can be adjusted to achieve impact testing in three directions of X / Y / Z on an impact test bench that can only perform impact in a single direction. The tooling is easy to use and has good applicability.

[0030] 2. The battery pack impact system provided in the present application can perform impact tests on multiple battery packs at the same time by using the impact tooling as described above, which is beneficial to improving the test efficiency; at the same time, it reduces the functional requirements for the impact test bench, and can be compatible with impact tests in three directions of X / Y / Z on an impact test bench that can only perform impact in a single direction. It is easy to use and has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the cooperation between the impact tool and the battery pack of the utility model;

[0032] Figure 2 for Figure 1 A front view of

[0033] Figure 3 for Figure 1 Side view of

[0034] Figure 4 This is a structural schematic diagram of the seat plate of the utility model;

[0035] Figure 5 It is a structural schematic diagram of the limit strip of the utility model;

[0036] Figure 6 It is a structural schematic diagram of the battery pack of the utility model;

[0037] Figure 7 is a stress distribution diagram of the bracket under +X direction impact in Example 4;

[0038] Figure 8 This is a maximum stress / time curve of the bracket under +X-direction impact in Example 4;

[0039] Fig. 9 is the stress distribution diagram of the weld under +X direction impact in Example 4;

[0040] Fig.10 It is the maximum stress / time curve of the weld under +X direction impact in Example 4;

[0041] Fig.11 is a stress distribution diagram of the seat plate under +X direction impact in Example 4;

[0042] Fig.12 The maximum stress / time curve of the seat plate under +X direction impact in Example 4;

[0043] Fig.13 A schematic diagram of a test method of the battery pack impact system of the utility model;

[0044] Fig.14 for Fig.13 A top view of

[0045] Fig.15 It is a schematic diagram of another test method of the battery pack impact system of the utility model;

[0046] Fig.16 for Fig.15 Side view of

[0047] Fig.17 for Fig.15 Top view of the .

[0048] Markings in the figure: 10- bracket; 11- side bar; 12- inclined bar; 13- seat plate; 14- limiting bar; 15- first bolt hole; 16- second bolt hole; 17- third bolt hole; 18- fourth bolt hole; 20- impact test bench; 21- battery pack; 22- wedge; 23- limiting slope. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0050] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product / equipment / device of the utility model when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0051] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0052] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0053] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0054] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0055] Example 1

[0056] An impact tooling provided in this embodiment includes a bracket 10 , wherein the bracket 10 has at least three mounting surfaces, two adjacent mounting surfaces are perpendicular to each other, and the mounting surfaces can be fixedly connected to the impact test bench 20 and / or the battery pack 21 .

[0057] The support 10 may be a solid structure, or a hollow structure or a hollow frame.

[0058] The number of mounting surfaces on the bracket 10 may be 3, 4, 5 or 6. If the number of mounting surfaces is 6, it includes three pairs of mounting surfaces arranged opposite to each other, and any two pairs of mounting surfaces are perpendicular to each other.

[0059] The shape of the bracket 10 may be a triangular pyramid having three mutually perpendicular surfaces, and the three mutually perpendicular surfaces of the triangular pyramid may be selected as mounting surfaces.

[0060] The shape of the bracket 10 can also be a hexahedron with adjacent faces perpendicular to each other. Three, four, five or six faces of the hexahedron can be selected as installation faces. If the lengths of all edges of the hexahedron are equal, it is a regular hexahedron.

[0061] The shape of the bracket 10 can also be formed by cutting corners or edges of a hexahedron.

[0062] The impact test bench 20 is a device for performing an impact test. At least one mounting surface can be fixedly connected to the impact test bench 20 for mounting the bracket 10 on the impact test bench 20 .

[0063] The test piece for the impact test may be a battery pack 21 . In addition to the mounting surface for being fixedly connected to the impact test bench 20 , at least two mounting surfaces can be fixedly connected to the battery pack 21 .

[0064] The impact tooling provided in the present application can be used for the impact test of the battery pack 21. By setting at least three mounting surfaces on the bracket 10, when performing the impact test, one of the mounting surfaces can be used to be fixedly connected to the impact test bench 20, and the other at least two mounting surfaces are used to fix the battery pack 21, so that multiple battery packs 21 can be tested at the same time, which is conducive to improving the test efficiency;

[0065] At the same time, since two adjacent mounting surfaces are perpendicular to each other, by adjusting the mounting direction and mounting position of the battery pack 21, impact testing in three directions of X / Y / Z can be achieved on the impact test bench 20 which can only perform impact in a single direction. This is convenient to use and has good applicability.

[0066] Example 2

[0067] The impact tool provided in this embodiment is optimized on the basis of the embodiment 1. In this embodiment, the bracket 10 is welded by a square tube assembly.

[0068] The square tube assembly includes several square tubes. The square tubes are hollow structures with the characteristics of light weight and high strength. They are not only easy to install and use, but also can meet the strength requirements of impact tests.

[0069] The material of the square tube can be Q355 steel, and its yield strength is 355MPa.

[0070] The side of the square tube is relatively flat and can be conveniently fixedly connected to the impact test bench 20 or the battery pack 21 .

[0071] By welding the square tubes together, the bracket 10 in the shape of a hollow frame can be formed.

[0072] The welding wire model ER50-6 can be used for welding, and the yield strength of the weld formed is 475MPa.

[0073] Preferably, the bracket 10 is a regular hexahedron, and the square tube assembly includes side bars 11 and oblique bars 12 . The side bars 11 are located on the edges of the bracket 10 , and the oblique bars 12 are located on the diagonal lines of the surface of the bracket 10 .

[0074] See also Figure 1 The number of the side rods 11 is 12, and a regular hexahedral frame is formed by end-to-side docking.

[0075] On each side of the bracket 10, an inclined rod 12 is provided on the diagonal line thereof. Three inclined rods 12 are combined to form an X shape to strengthen the strength of the frame structure and improve its stability to meet the requirements of the 0-150g impact test.

[0076] Example 3

[0077] A battery pack impact system provided in this embodiment includes a battery pack 21, an impact test bench 20 and an impact tooling as described in Embodiment 1 or 2. The bracket 10 is fixedly connected to the impact test bench 20 via a mounting surface, and the battery pack 21 is fixed on the mounting surface.

[0078] One or more battery packs 21 may be tested simultaneously according to test requirements.

[0079] The battery pack 21 impact system provided in the present application can perform impact tests on multiple battery packs 21 at the same time by using the above-mentioned impact tooling, which is beneficial to improving the test efficiency; at the same time, it reduces the functional requirements for the impact test bench 20, and can be compatible with impact tests in three directions of X / Y / Z on the impact test bench 20 that can only perform impact in a single direction. It is easy to use and has good applicability.

[0080] Example 4

[0081] The present embodiment provides a battery pack impact system, which is optimized on the basis of the embodiment 3. In the present embodiment, the battery pack 21 impact system further includes a seat plate 13 and a limit assembly. The seat plate 13 is fixed on the mounting surface, and the limit assembly is fixed on the seat plate 13. The limit assembly can fix the battery pack 21. Figure 1-5 .

[0082] The seat plate 13 is a plate structure and can be detachably connected to the bracket 10. The connection method can be bolt connection, magnetic connection, snap connection, etc.

[0083] After the installed seat plate 13 is removed and rotated 90° along the plate surface, it can still be fixedly connected to the installation surface.

[0084] The limiting assembly can be detachably connected to the seat plate 13 , and the limiting assembly is used to fix the battery pack 21 , and the fixing method can be pressing, snapping, locking, etc.

[0085] The seat plate 13 and the limiting assembly are provided to facilitate the installation and fixation of the battery pack 21 .

[0086] Preferably, at least two first bolt holes 15 are provided on the mounting surface, at least two second bolt holes 16 are provided on the seat plate 13, and the seat plate 13 is connected to the mounting surface by bolts.

[0087] The first bolt hole 15 and the second bolt hole 16 can have the same diameter as the bolt hole on the impact test bench 20. In the present embodiment, both are through holes with a diameter of 100 mm, so that the mounting surface on the bracket 10 can be fixed to both the impact test bench 20 and the seat plate 13. The bolts are locked by passing through the first bolt hole 15 and the second bolt hole 16, or the bolts are locked by passing through the first bolt hole 15 and the bolt hole on the impact test bench 20.

[0088] At least two first bolt holes 15 are aligned with the second bolt holes 16 to fix the seat plate 13 . Similarly, at least two first bolt holes 15 are aligned with the bolt holes on the impact test bench 20 to fix the bracket 10 .

[0089] In this embodiment, the first bolt holes 15 are arranged circumferentially around the mounting surface, and the number of the first bolt holes 15 is 4×5; the seat plate 13 is a rectangular plate, and the second bolt holes 16 are arranged circumferentially around the seat plate 13. The second bolt holes 16 located on three sides of the seat plate 13 can be aligned with the first bolt holes 15.

[0090] Similarly, at least two third bolt holes 17 are provided on the seat plate 13 , and at least two fourth bolt holes 18 are provided on the limiting assembly. The limiting assembly is connected to the seat plate 13 by bolts.

[0091] The third bolt hole 17 may be a countersunk hole for accommodating a nut located at one side of the bracket 10 .

[0092] At least two third bolt holes 17 are aligned with the fourth bolt hole 18 to fix the limiting assembly.

[0093] The third bolt hole 17 and the fourth bolt hole 18 are arranged around the battery pack 21 .

[0094] Preferably, the limiting assembly includes at least four limiting bars 14 , and at least part of the limiting bars 14 enclose the battery pack 21 .

[0095] The cross section of the battery pack 21 is generally rectangular, and the four limiting bars 14 are provided to fix the battery pack 21 from all sides, and the installation and removal are convenient.

[0096] Further preferably, a wedge-shaped piece 22 is provided on the lower portion of the side of the battery pack 21 , and a limiting slope 23 is provided on the side of at least part of the limiting strip 14 , the limiting slope 23 is adapted to the upper surface of the wedge-shaped piece 22 , and the limiting slope 23 can lock the battery pack 21 .

[0097] See also Figure 6 , outwardly protruding wedge-shaped pieces 22 may be provided at the lower portions of the four sides of the battery pack 21 , and the limiting strips 14 may fix the battery pack 21 by pressing the wedge-shaped pieces 22 .

[0098] The cross-sectional shape of the wedge-shaped piece 22 may be a right-angled trapezoid, and its upper surface is a slope inclined downward. In order to better fasten the wedge-shaped piece 22 and prevent the battery pack 21 from relative slipping during the impact, a limiting slope 23 may be provided on the side of the limiting strip 14, and the limiting slope 23 is adapted to the upper surface of the wedge-shaped piece 22.

[0099] The limiting inclined surfaces 23 may be provided on some of the limiting strips 14 or on all of the limiting strips 14 . The limiting inclined surfaces 23 may be provided continuously or at intervals.

[0100] It should be noted that, in this embodiment, the lower portion refers to the position of the battery pack 21 close to the bracket 10 , and in contrast, the position of the battery pack 21 far from the bracket 10 is the upper portion.

[0101] Taking into account the installation structure of the battery pack 21, the present application uniformly stipulates that when the battery pack 21 is fixed on the seat plate 13, the normal direction of the seat plate 13 is the Z direction of the battery pack 21, and correspondingly, the X direction and Y direction of the battery pack 21 are the two side normal directions perpendicular to the Z direction.

[0102] In this embodiment, see Figure 6 The X-direction dimension of the battery pack 21 is smaller than the Y-direction dimension; the X-direction and Y-direction positions of the battery pack 21 can be swapped in space by rotating the seat plate 13 or the battery pack 21 to adjust the impact direction for impact testing in the X-direction and Y-direction.

[0103] The applicant simulated the impact system of the battery pack 21 described in this embodiment. According to the national standard GB38031-2020 and industry requirements or vehicle manufacturer requirements, the impact test requires the battery to be tested in six different directions of ±X / ±Y / ±Z. Since the structure of the fixture bracket 10 is symmetrical, the fixture is subjected to a simulated impact in the +X direction. A finite element model is established for the impact fixture and the battery, and a specified 150g / 15ms impact load is applied. The simulation results show that during the mechanical impact process in the +X direction, the proportion of hourglass energy and slip energy in the total internal energy is less than 5%, which meets the industry standards and the results are credible; see Figure 7-8 , under mechanical impact conditions, the +X stress of bracket 10 is 327.97MPa, which is less than the yield strength of bracket 10Q355 material 355MPa, and the design meets the strength requirements; see Figure 9-10 , the +X stress of the weld of the bracket 10 under mechanical impact condition is 474.08MPa, which is less than the yield strength of the weld ER50-6 material 475MPa, and the design meets the strength requirements; see Figure 11-12 Under mechanical impact conditions, the +X stress of the seat plate 13 and the limit strip 14 is 326.45MPa, which is less than the yield strength of Q355 material 355MPa. The design meets the strength requirements.

[0104] In summary, under the specified impact load (150g / 15ms), the stresses of the bracket 10, weld, seat plate 13 and limit strip 14 in the impact fixture are all less than the yield strength of the corresponding materials, meeting the strength requirements.

[0105] Example 5

[0106] A battery pack impact system provided in this embodiment is optimized based on Embodiment 3 or 4. In this embodiment, the number of mounting surfaces is 4, and all mounting surfaces are connected end to end.

[0107] Taking the impact test bench 20 provided by the testing organization as an example, the impact test bench 20 can only perform horizontal back-and-forth impact in ±X directions.

[0108] During the test, any mounting surface is selected to be fixed to the impact test bench 20, and three battery packs 21 are respectively mounted on the other three mounting surfaces. By adjusting the mounting direction of the battery packs 21, the ±Z direction of two battery packs 21 and the ±X direction of one battery pack 21 can be tested simultaneously. Figure 13-14 ; After the bracket 10 is rotated 90° and then the bolts are tightened, the ±Y direction of the three battery packs 21 can be tested simultaneously, see Figure 15-17 , to meet the testing needs.

[0109] Of course, the battery pack 21 may also be rotated to switch the ±X direction and the ±Y direction of the battery pack 21 .

[0110] Example 6

[0111] A battery pack impact system provided in this embodiment is based on Embodiment 3 or 4, and differs from Embodiment 5 in that, in this embodiment, the number of mounting surfaces is 4, and all mounting surfaces include 3 mounting surfaces that are adjacent to each other.

[0112] Taking the impact test bench 20 provided by the testing organization as an example, the impact test bench 20 can only perform horizontal back-and-forth impact in ±X directions.

[0113] During the test, any mounting surface is selected to be fixed to the impact test bench 20, and the other three mounting surfaces are connected to the same vertex. By adjusting the mounting direction of the battery pack 21, the ±Z direction of one battery pack 21, the ±X direction of one battery pack 21, and the ±Y direction of one battery pack 21 can be tested simultaneously to meet the test requirements.

[0114] Of course, the battery pack 21 or the bracket 10 may also be rotated to perform impact tests on the battery pack 21 in other directions.

[0115] When the number of mounting surfaces is 3, 5 or 6, the test method can be inferred and can meet the test requirements.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An impact tool, characterized in that: It comprises a bracket (10), wherein the bracket (10) has at least three mounting surfaces, two adjacent mounting surfaces are perpendicular to each other, and the mounting surfaces can be fixedly connected to an impact test bench (20) and / or a battery pack (21).

2. The impact tool according to claim 1, characterized in that: The bracket (10) is formed by welding square tube components.

3. The impact tool according to claim 2, characterized in that: The support (10) is a regular hexahedron, and the square tube assembly comprises side bars (11) and oblique bars (12), wherein the side bars (11) are located on the edges of the support (10), and the oblique bars (12) are located on the diagonal lines of the surface of the support (10).

4. A battery pack impact system, characterized in that: It comprises a battery pack (21), an impact test bench (20) and an impact tool as claimed in any one of claims 1 to 3, wherein the bracket (10) is fixedly connected to the impact test bench (20) via the mounting surface, and the battery pack (21) is fixed on the mounting surface.

5. The battery pack impact system according to claim 4, characterized in that: It also includes a seat plate (13) and a limiting assembly, wherein the seat plate (13) is fixed on the mounting surface, the limiting assembly is fixed on the seat plate (13), and the limiting assembly is capable of fixing the battery pack (21).

6. The battery pack impact system according to claim 5, characterized in that: At least two first bolt holes (15) are provided on the mounting surface, at least two second bolt holes (16) are provided on the seat plate (13), and the seat plate (13) is connected to the mounting surface by bolts; and / or, At least two third bolt holes (17) are provided on the seat plate (13), at least two fourth bolt holes (18) are provided on the limiting assembly, and the limiting assembly is bolted to the seat plate (13).

7. The battery pack impact system according to claim 5, characterized in that: The limiting assembly comprises at least four limiting bars (14), and at least a portion of the limiting bars (14) encloses the battery pack (21).

8. The battery pack impact system according to claim 7, characterized in that: A wedge-shaped piece (22) is provided at the lower part of the side surface of the battery pack (21), and a limiting inclined surface (23) is provided on the side edge of at least part of the limiting strip (14), wherein the limiting inclined surface (23) is matched with the upper surface of the wedge-shaped piece (22), and the limiting inclined surface (23) can lock the battery pack (21).

9. The battery pack impact system according to any one of claims 4 to 8, characterized in that: The number of the mounting surfaces is 4, and all the mounting surfaces are connected end to end.

10. The battery pack impact system according to any one of claims 4 to 8, characterized in that: The number of the mounting surfaces is 4, and all the mounting surfaces include 3 mounting surfaces that are adjacent to each other.

Images