Testing device

Abstract

According to the testing device, a to-be-tested battery pack is installed on a second support, a first support restrains the second end of the second support, and the second end of the second support has the freedom degree of rotating around the long axis of the second support. During testing, the first bracket applies two load forces in opposite directions to the second bracket, so that the second end rotates around the long axis of the second bracket, and the to-be-tested battery pack mounted on the second bracket is subjected to a torsion force along with the rotation of the second bracket, thereby performing a torsion test on the to-be-tested battery pack. The working condition of the to-be-tested battery pack on the non-paving road is accurately reproduced, whether the torsional strength of the to-be-tested battery pack can meet the working condition requirement or not is evaluated, and then the reliability of the strength safety design of the to-be-tested battery pack can be accurately evaluated.

Description

Technical Field

[0001] This application relates to the field of detection technology, and more specifically, to a testing device. Background Art

[0002] Generally speaking, the battery pack to be tested applied to an automobile needs to be subjected to a vibration intensity test in accordance with relevant national standards to simulate the force condition of the battery pack to be tested during the operation of the whole vehicle. However, at present, the national standard for the strength test of the battery pack to be tested only includes vibration test, but does not include torsion test, and cannot truly simulate the torsion force condition of the battery pack to be tested when the vehicle is driving on an unpaved road. Correspondingly, the testing devices in the related art can only perform vibration tests on the battery pack to be tested and cannot perform torsion tests on the battery pack to be tested. Utility Model Content

[0003] The purpose of the embodiment of this application is to provide a testing device. The battery pack to be tested is installed on the second bracket, and the degree of freedom of the second end of the second bracket is restricted by the first bracket, and a torsion force is applied to the battery pack to be tested to perform a torsion test, so as to more accurately evaluate the reliability of the strength safety design of the battery pack to be tested.

[0004] The embodiment of this application provides a testing device for performing a fatigue test on a battery pack to be tested. The testing device includes:

[0005] A base;

[0006] A first bracket located on the base, with one side of the first bracket connected to the base;

[0007] A second bracket located on the first bracket, having a first end and a second end. The first end is connected to the base, the second end is connected to the other side of the first bracket, and an installation space is provided on the second bracket for installing the battery pack to be tested;

[0008] Wherein, the second end has the degree of freedom to rotate around the long axis of the second bracket, and the first bracket is used to apply two load forces in opposite directions to the second bracket, so that the second end rotates around the long axis of the second bracket and drives the battery pack to be tested to twist.

[0009] In one embodiment, the first bracket includes:

[0010] A fixing part fixed on the base;

[0011] A first constraint part located on the fixing part, the first constraint part is rotationally connected to the fixing part, and the first constraint part has the degree of freedom to rotate in a first direction, and the first direction is parallel to the long axis of the second bracket;

[0012] The first movable part is located on the first constraint part. One side of the first movable part is rotatably connected to the first constraint part, and the other side of the first movable part is connected to the second end. The first movable part has a degree of freedom to rotate about the first direction.

[0013] In one embodiment, the first constraint part includes a first limiting sub - part and a first connecting sub - part provided on the first limiting sub - part. The first movable part is rotatably connected to the first connecting sub - part through a first connecting member, and the first limiting sub - part is rotatably connected to the fixed part through a second connecting member.

[0014] In one embodiment, the first limiting sub - part extends along a second direction, and the second direction intersects the first direction;

[0015] The first bracket includes two of the first movable parts, and the first constraint part includes two of the first connecting sub - parts. In the orthographic projection pattern on the base, the two first connecting sub - parts are respectively located on both sides of the fixed part in the second direction.

[0016] In one embodiment, the first bracket further includes at least two sets of loading parts, and each loading part is fixed on the first limiting sub - part;

[0017] In the orthographic projection pattern on the base, one set of the loading parts is correspondingly arranged on one side of one first connecting sub - part away from the fixed part.

[0018] In one embodiment, the first limiting sub - part includes a first bottom plate, a first side plate and a first top plate. The first side plate is connected between the first bottom plate and the first top plate. The first bottom plate is located on the side of the first side plate close to the fixed part, and the first top plate is located on the side of the first side plate away from the fixed part;

[0019] The first connecting sub - part is fixed to the first bottom plate, and a limiting opening is formed on the first top plate. A part of the first movable part passes through the limiting opening and is rotatably connected to the first connecting sub - part.

[0020] In one embodiment, the limiting opening extends along the second direction.

[0021] In one embodiment, the testing device further includes a third bracket, which is located between the base and the second bracket. The third bracket includes:

[0022] The second constraint part is located on the base. A first connecting arm, a second connecting arm, and a third connecting arm are sequentially arranged in the extending direction of the second constraint part. The second constraint part is respectively connected to the base through the first connecting arm, the second connecting arm, and the third connecting arm. The extending direction of the second connecting arm intersects with the extending direction of the first connecting arm, and the extending direction of the second connecting arm intersects with the extending direction of the third connecting arm;

[0023] The second movable part is located on the second constraint part. One side of the second movable part is connected to the second constraint part, and the other side of the second movable part is connected to the first end.

[0024] In an embodiment, the first movable part is rotatably connected to the second end through a third connecting piece, and the axial direction of the third connecting piece is parallel to the short axis of the second bracket;

[0025] The second movable part is rotatably connected to the first end through a fourth connecting piece, and the axial direction of the fourth connecting piece is parallel to the short axis of the second bracket;

[0026] The axial direction of the first connecting piece is parallel to the first direction, and the axial direction of the second connecting piece is parallel to the first direction;

[0027] The second movable part is rotatably connected to the second constraint part through a fifth connecting piece, and the axial direction of the fifth connecting piece is parallel to the first direction;

[0028] The first connecting arm, the second connecting arm, and the third connecting arm are respectively connected to the second constraint part through a sixth connecting piece, the axial direction of the sixth connecting piece is parallel to the first direction, the first connecting arm, the second connecting arm, and the third connecting arm are respectively connected to the base through a seventh connecting piece, and the axial direction of the seventh connecting piece is parallel to the first direction.

[0029] In an embodiment, the second constraint part includes a second limiting sub - part and a second connecting sub - part;

[0030] The second limiting sub - part includes a second bottom plate, second side plates, and a second top plate. The second side plates are connected between the second bottom plate and the second top plate. The second bottom plate is located on the side of the second side plates close to the base, and the second top plate is located on the side of the second side plates far from the base;

[0031] The second connecting sub - part is fixed to the second top plate. An avoidance opening is formed on the second bottom plate, and part of the first connecting arm, part of the second connecting arm, and part of the third connecting arm all pass through the avoidance opening and are connected to the second connecting sub - part.

[0032] In one embodiment, a plurality of groups of first fixing holes are formed in the second top plate, at least one group of second fixing holes is formed in the second connecting sub - part, and the group of second fixing holes is fixedly connected to any one group of the first fixing holes through an eighth connecting member.

[0033] The beneficial effect of the test device provided by the embodiment of the present application is as follows: Compared with the related art, in the test device of the present application, the battery pack to be tested is installed on the second bracket, the first bracket restricts the second end of the second bracket, and the second end of the second bracket has a degree of freedom of rotation around the long axis of the second bracket. During the test, the first bracket applies two load forces in opposite directions to the second bracket, so that the second end rotates around the long axis of the second bracket, and the battery pack to be tested installed on the second bracket is subjected to a torsional force as the second bracket rotates, thereby performing a torsional test on the battery pack to be tested, accurately reproducing the working conditions of the battery pack to be tested on an unpaved road, evaluating whether the torsional strength of the battery pack to be tested can meet the working condition requirements, and further accurately evaluating the reliability of the strength safety design of the battery pack to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 is a schematic three - dimensional structure diagram of the test device provided by the embodiment of the present application;

[0036] Figure 2 is Figure 1 the left view of

[0037] Figure 3 is Figure 1 the front view of

[0038] Figure 4 is Figure 1 the top view of

[0039] Figure 5 is Figure 1 the right view of

[0040] Among them, the reference numerals in the drawings are as follows:

[0041] 100, test device; 200, battery pack to be tested;

[0042] 110, base; 120, first bracket; 130, second bracket; 140, third bracket; 131, first end; 132, second end;

[0043] 121. Fixed part; 122. First constraint part; 123. First movable part; 124. Loading part; 141. Second constraint part; 142. First connecting arm; 143. Second connecting arm; 144. Third connecting arm; 145. Second movable part;

[0044] 1221. First limit sub - part; 1222. First connecting sub - part; B1. First bottom plate; B2. First side plate; B3. First top plate; 1411. Second limit sub - part; 1412. Second connecting sub - part; P1. Second bottom plate; P2. Second side plate; P3. Second top plate;

[0045] C1. Limit opening; C2. Avoidance opening; U. Installation space; K1. First fixing hole; K2. Second fixing hole; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation mode

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0047] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0048] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, 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, and therefore cannot be understood as a limitation to this application.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0050] Please refer to together Figures 1 to 5, the test device 100 provided by the embodiments of the present application will be described below. The test device 100 of the present application is used to perform fatigue tests on the battery pack 200 to be tested. As Figure 1 shown, the test device 100 includes a base 110, a first bracket 120, a second bracket 130, and a third bracket 140. The first bracket 120 and the third bracket 140 are located on the base 110, and the second bracket 130 is located on the first bracket 120 and the second bracket 130. The second bracket 130 has a first end 131 and a second end 132. The first end 131 of the second bracket 130 is connected to the base 110 through the third bracket 140. The second end 132 of the second bracket 130 is connected to the base 110 through the first bracket 120. That is, one side of the first bracket 120 is connected to the base 110, and the other side of the first bracket 120 is connected to the second end 132 of the second bracket 130. An installation space U is provided on the second bracket 130, and the battery pack 200 to be tested is installed in the installation space U.

[0051] Among them, the second end 132 has a degree of freedom of rotation about the long axis of the second bracket 130. The first bracket 120 is used to constrain the degree of freedom of the second end 132 of the second bracket 130, and the first bracket 120 is used to apply two load forces in opposite directions to the second bracket 30. During the test, the first bracket 120 is used to apply two load forces in opposite directions to the second bracket 30, so that the second end 132 rotates about the long axis of the second bracket 130 and drives the battery pack 200 to be tested to twist.

[0052] In mechanics, a rigid body has at most three translational degrees of freedom and three rotational degrees of freedom in three-dimensional space: translation along the X-axis, rotation about the X-axis, translation along the Y-axis, rotation about the Y-axis, translation along the Z-axis, and rotation about the Z-axis. In the present application, the first bracket 120 constrains the degree of freedom of the second end 132 of the second bracket 130, and the second end 132 of the second bracket 130 has a degree of freedom of rotation about the long axis of the second bracket 130, so that torsion can be performed. It should be noted that the long axis of the second bracket 130 refers to the central axis that extends along the long side direction of the second bracket 130 and passes through the center of the second bracket 130. The short axis of the second bracket 130 refers to the central axis that extends along the short side direction of the second bracket 130 and passes through the center of the second bracket 130.

[0053] In the test device 100 provided by the embodiment of the present application, the battery pack 200 to be tested is installed on the second bracket 130. The first bracket 120 restricts the second end 132 of the second bracket 130, and the second end 132 of the second bracket 130 has a degree of freedom to rotate around the long axis of the second bracket 130. During the test, the first bracket 120 applies two load forces in opposite directions to the second bracket 130, so that the second end 132 rotates around the long axis of the second bracket 130. The battery pack 200 to be tested installed on the second bracket 130 is subjected to a torsional force as the second bracket 130 rotates, thereby performing a torsional test on the battery pack 200 to be tested, accurately reproducing the working conditions of the battery pack 200 to be tested on an unpaved road, and evaluating whether the torsional strength of the battery pack 200 to be tested can meet the requirements of the working conditions, so as to accurately evaluate the reliability of the strength safety design of the battery pack 200 to be tested.

[0054] Specifically, as Figure 1 and Figure 2 shown, the first bracket 120 includes a fixed part 121, a first constraint part 122, and a first movable part 123. In the direction from the base 110 towards the second bracket 130, the fixed part 121, the first constraint part 122, and the first movable part 123 are arranged in sequence. That is, the fixed part 121 is fixed to the base 110, the first constraint part 122 is located on the fixed part 121, and the first movable part 123 is located on the first constraint part 122.

[0055] The first constraint part 122 is rotatably connected to the fixed part 121, so that the first constraint part 122 has a degree of freedom to rotate around the first direction X, where the first direction X is parallel to the long axis of the second bracket 130. That is, the first constraint part 122 can rotate around the first direction X. One side of the first movable part 123 is rotatably connected to the first constraint part 122, and the other side is connected to the second end 132 of the second bracket 130, so that the first movable part 123 has a degree of freedom to rotate around the first direction X.

[0056] Since the fixed part 121 is fixed to the base 110 by screws, the first constraint part 122 is rotatably connected to the fixed part 121, and the first movable part 123 is rotatably connected to the first constraint part 122, the translational degree of freedom of the first bracket 120 in the third direction Z is restricted, and further the translational degrees of freedom of the second bracket 130 and the battery pack 200 to be tested in the third direction Z are restricted.

[0057] In the present application, the first direction X is the long side direction of the second bracket 130, and the first direction X is parallel to the long axis of the second bracket 130. The second direction Y is the wide side direction of the second bracket 130, and the second direction Y is parallel to the short axis of the second bracket 130. The third direction Z is the longitudinal direction of the second bracket 130, that is, the height direction of the second bracket 130. The first direction X, the second direction Y, and the third direction Z intersect pairwise. Specifically, in this embodiment, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise.

[0058] Since the first constraint portion 122 is rotatably connected to the fixed portion 121, and one side of the first movable portion 123 is rotatably connected to the first constraint portion 122, when the first constraint portion 122 rotates around the first direction X, it drives the first movable portion 123 to rotate around the first direction X, thereby applying a torsional force to the second bracket 130, and the second bracket 130 has a torsional force on the battery pack 200 to be tested. In the present application, the second bracket 130 simulates the frame structure to truly simulate the vehicle driving environment and further ensure the authenticity of the torsional strength test of the battery pack 200 to be tested.

[0059] In this embodiment, please refer to Figure 1 and Figure 3 , the first constraint portion 122 includes a first limiting sub-portion 1221 and a first connecting sub-portion 1222 provided on the first limiting sub-portion 1221. The first limiting sub-portion 1221 extends along the second direction Y. The first connecting sub-portion 1222 includes a fixing plate and a connecting ear. The connecting ear has an opening along the second direction Y, and a part of the first movable portion 123 extends into the opening of the connecting ear to be connected to the connecting ear. A through hole along the first direction X is formed in the connecting ear, and a first connecting member passes through the through hole and the first movable portion 123 to connect the first movable portion 123 and the first connecting sub-portion 1222, realizing the rotational connection between the first movable portion 123 and the first connecting sub-portion 1222. The axial direction of the first connecting member is parallel to the first direction X.

[0060] In the present application, the first connecting member, the second connecting member, the third connecting member, the fourth connecting member, the fifth connecting member, the sixth connecting member, and the seventh connecting member are all pin shafts, and the eighth connecting member is a screw.

[0061] The fixing part 121 includes a support column and a connecting ear. The connecting ear has an opening along the second direction Y, and part of the first limiting sub - part 1221 extends into the opening of the connecting ear to be connected with the connecting ear. A through - hole is formed in the connecting ear along the first direction X, and a second connecting member passes through the through - hole and the first limiting sub - part 1221 to connect the first limiting sub - part 1221 and the fixing part 121, realizing the rotational connection between the first limiting sub - part 1221 and the fixing part 121. The axial direction of the second connecting member is parallel to the first direction X. The first limiting sub - part 1221 is rotationally connected to the fixing part 121 through the second connecting member. Optionally, the fixing part 121 is connected to the middle of the first limiting sub - part 1221 to facilitate torque adjustment and avoid excessive torque caused by too large a distance between the acting point of the first limiting sub - part 1221 and the fulcrum of the fixing part 121.

[0062] Since the first constraint part 122 and the first movable part 123 are rotationally connected, and the first constraint part 122 is rotationally connected to the fixing part 121, the first constraint part 122 can rotate around the first direction X. Since the opening of the connecting ear of the first connecting sub - part 1222 extends along the second direction Y, part of the first movable part 123 extends into the opening, and the connecting ear restricts the translation of both sides of the first movable part 123 in the first direction X. Similarly, the opening of the connecting ear of the fixing part 121 extends along the second direction Y, part of the first limiting sub - part 1221 extends into the opening, and the connecting ear restricts the translation of both sides of the first limiting sub - part 1221 in the first direction X. That is, the translational degrees of freedom of the fixing part 121, the first constraint part 122, and the first movable part 123 in the first direction X are all restricted and cannot translate in the first direction X. The translational degree of freedom of the second end 132 of the second bracket 130 and the first movable part 123 as a whole in the first direction X is also constrained, so that the battery pack 200 to be measured cannot perform translation in the first direction X.

[0063] In this embodiment, as Figure 3 and Figure 4 , the first bracket 120 includes two first movable parts 123, and the corresponding first constraint part 122 includes two first connecting sub - parts 1222. One first movable part 123 is correspondingly connected to one first connecting sub - part 1222. In the orthographic projection pattern on the base 110, the two first connecting sub - parts 1222 are respectively located on both sides of the fixing part 121 in the second direction Y. When the first constraint part 122 rotates with the connection point with the fixing part 121 as the fulcrum, the two first movable parts 123 are located on both sides of the fulcrum and move correspondingly, facilitating the application of two torsion forces in opposite directions to the second bracket 130.

[0064] Further, the first bracket 120 further includes at least two sets of loading portions 124, and each loading portion 124 is fixed on the first limiting sub-portion 1221. In the orthographic projection pattern on the base 110, one set of loading portions 124 is correspondingly arranged on one side of a first connecting sub-portion 1222 away from the fixing portion 121. That is, the two sets of loading portions 124 are located outside the two first connecting sub-portions 1222, which can avoid the interference of the first moving portion 123 on the application of the load. Two torsional loads are respectively applied to the two sets of loading portions 124, and the directions of the two loads are opposite, so that the first constraint portion 122 rotates. By providing two sets of loading portions 124 to apply a torsional force to the first constraint portion 122, it is beneficial to adjust the load magnitude and apply the force evenly.

[0065] Specifically, please refer to Figure 1 , Figure 2 and Figure 3 As shown in, the first limiting sub-portion 1221 includes a first bottom plate B1, a first side plate B2, and a first top plate B3. The first side plate B2 is connected between the first bottom plate B1 and the first top plate B3. The first bottom plate B1 is located on the side of the first side plate B2 close to the fixing portion 121, and the first top plate B3 is located on the side of the first side plate B2 away from the fixing portion 121. Optionally, each set of loading portions 124 includes one loading portion 124. The two sets of loading portions 124 are both fixed on the first top plate B3, or the two loading portions 124 are both fixed on the first bottom plate B1. Optionally, one loading portion 124 is fixed on the first top plate B3 to facilitate applying the load force from top to bottom, and the other loading portion 124 is fixed on the first bottom plate B1 to facilitate applying the load force from bottom to top. In this embodiment, each set of loading portions 124 includes two loading portions 124. One loading portion 124 in each set is fixed on the first top plate B3, and the other loading portion 124 is fixed on the first bottom plate B1 to facilitate applying the load to the first constraint portion 122 from top to bottom or from bottom to top.

[0066] In this embodiment, the first connecting sub-portion 1222 is fixed to the first bottom plate B1. A limiting opening C1 is formed on the first top plate B3. Part of the first moving portion 123 passes through the limiting opening C1 and is rotatably connected to the first connecting sub-portion 1222. Part of the first moving portion 123 extends into the limiting opening C1, and the first top plate B3 restricts the translational degree of freedom of the first moving portion 123 in the first direction X. The limiting opening C1 extends along the second direction Y, reducing the restriction of the limiting opening C1 on the rotation of the first constraint portion 122 around the first direction X. The remaining part of the first moving portion 123 is restricted by the first top plate B3, thereby reducing the rotation range of the first moving portion 123 and the first constraint portion 122, and avoiding the out-of-control rotation of the first constraint portion 122 from damaging the test device 100 and the battery pack 200 to be tested.

[0067] In this embodiment, please refer to Figure 1 and Figure 5, the third bracket 140 is located between the base 110 and the second bracket 130. The third bracket 140 includes a second restraint portion 141 and a second movable portion 145. The second restraint portion 141 is located on the base 110, the second movable portion 145 is located on the second restraint portion 141, one side of the second movable portion 145 is connected to the second restraint portion 141, and the other side of the second movable portion 145 is connected to the first end 131 of the second bracket 130.

[0068] The first movable portion 123 is rotatably connected to the second end 132 of the second bracket 130 through a third connecting member, and the axial direction of the third connecting member is parallel to the second direction Y. The second movable portion 145 is rotatably connected to the first end 131 of the second bracket 130 through a fourth connecting member, and the axial direction of the fourth connecting member is parallel to the second direction Y. The second bracket 130 has a rotational degree of freedom relative to the first movable portion 123 in the second direction Y, and the second bracket 130 has a rotational degree of freedom relative to the second movable portion 145 in the second direction Y. Due to the settings of the first movable portion 123 and the second movable portion 145, when a load is applied to the second bracket 130, the second bracket 130 can simulate the vibration conditions during vehicle driving, further improving the test accuracy.

[0069] The second restraint portion 141 is sequentially provided with a first connecting arm 142, a second connecting arm 143, and a third connecting arm 144 in its extending direction. The second restraint portion 141 is respectively connected to the base 110 through the first connecting arm 142, the second connecting arm 143, and the third connecting arm 144. The extending direction of the second connecting arm 143 intersects the extending direction of the first connecting arm 142, and the extending direction of the second connecting arm 143 intersects the extending direction of the third connecting arm 144. Since the lengths of the first connecting arm 142, the second connecting arm 143, and the third connecting arm 144 are fixed, the translation of the second restraint portion 141, the second movable portion 145, and the first end 131 of the second bracket 130 in the third direction Z is restricted. Also, since the extending direction of the second connecting arm 143 intersects the extending direction of the first connecting arm 142 and the extending direction of the third connecting arm 144 respectively, the translation of the second restraint portion 141 in the second direction Y will be subjected to the pulling force or pushing force of the second connecting arm 143, so the translation of the second restraint portion 141 in the second direction Y is restricted.

[0070] Please refer to Figure 1 , Figure 3 and Figure 4 , the second restraint portion 141 includes a second limiting sub-portion 1411 and a plurality of second connecting sub-portions 1412. The second connecting sub-portions 1412 are fixed on the second limiting sub-portion 1411. The second limiting sub-portion 1411 is provided with a connecting ear to connect with the second movable portion 145. The second connecting sub-portions 1412 include a fixing plate and a connecting ear, and are connected to the first connecting arm 142, the second connecting arm 143, or the third connecting arm 144.

[0071] Since the second movable part 145 is rotatably connected to the second restraint part 141 through a fifth connecting member, the axial direction of the fifth connecting member is parallel to the first direction X. A connecting ear is provided on the second restraint part 141, and the opening of the connecting ear extends along the second direction Y. Part of the second movable part 145 extends into the opening, and the connecting ear restricts the translation of both sides of the second movable part 145 in the first direction X.

[0072] The first connecting arm 142, the second connecting arm 143, and the third connecting arm 144 are respectively connected to the second restraint part 141 through a sixth connecting member. The axial direction of the sixth connecting member is parallel to the first direction X. The opening of the connecting ear of the second limiting sub-part 1411 extends along the second direction Y. Part of the first connecting arm 142 extends into the opening, and the connecting ear restricts the translation of both sides of the first connecting arm 142 in the first direction X. The first connecting arm 142, the second connecting arm 143, and the third connecting arm 144 are respectively arranged corresponding to the connecting ears of a second limiting sub-part 1411.

[0073] The first connecting arm 142, the second connecting arm 143, and the third connecting arm 144 are respectively connected to the base 110 through a seventh connecting member, and the axial direction of the seventh connecting member is parallel to the first direction X. Connecting ears are provided on the base 110 to restrict the translation of both sides of the connecting arm in the first direction X.

[0074] That is, the translational degrees of freedom of the second restraint part 141 and the second movable part 145 in the first direction X are both restricted and cannot translate in the first direction X. The translational degrees of freedom of the first end 131 of the second bracket 130 and the second movable part 145 as a whole in the first direction X are also constrained, so that the battery pack 200 to be measured cannot translate in the first direction X.

[0075] As Figure 3 shown, the second limiting sub-part 1411 includes a second bottom plate P1, a second side plate P2, and a second top plate P3. The second side plate P2 is connected between the second bottom plate P1 and the second top plate P3. The second bottom plate P1 is located on the side of the second side plate P2 close to the base, and the second top plate P3 is located on the side of the second side plate P2 away from the base. The second connecting sub-part 1412 is fixed to the second top plate P3. An avoidance opening C2 is formed on the second bottom plate P1. Part of the first connecting arm 142, part of the second connecting arm 143, and part of the third connecting arm 144 all pass through the avoidance opening C2 and are connected to the second connecting sub-part 1412. The second bottom plate P1 further restricts the translational degrees of freedom of the first connecting arm 142, the second connecting arm 143, and the third connecting arm 144 in the first direction X.

[0076] Optionally, as Figure 4, a plurality of groups of first fixing holes K1 are formed in the second top plate P3, and at least one group of second fixing holes K2 are formed in the second connecting sub - part 1412. One group of second fixing holes K2 is fixedly connected to any one group of first fixing holes K1 through an eighth connecting member. Through the arrangement of the plurality of groups of first fixing holes K1 and one group of second fixing holes K2, the fixing positions of the first connecting arm 142, the second connecting arm 143 and the third connecting arm 144 can be adjusted.

[0077] Optionally, a plurality of groups of fixing holes can also be provided on the first bottom plate B1 and the first top plate B3 to be fixedly connected to the first connecting sub - part 1222 and the loading part 124. A plurality of groups of fixing holes can also be provided on the first movable part 123 and the second movable part 145 to be fixedly connected to the second bracket 130. The arrangement of the plurality of groups of fixing holes facilitates the assembly and adjustment of the testing device 100.

[0078] The above is the description of the testing device 100 provided by the embodiments of the present application.

[0079] In the testing device provided by the embodiments of the present application, the battery pack to be tested is installed on the second bracket. The first bracket restricts the second end of the second bracket, and the second end of the second bracket has a degree of freedom of rotation about the long axis of the second bracket. During the test, the first bracket applies two load forces in opposite directions to the second bracket, so that the second end rotates about the long axis of the second bracket. The battery pack to be tested installed on the second bracket is subjected to a torsional force as the second bracket rotates, thereby performing a torsional test on the battery pack to be tested, accurately reproducing the working conditions of the battery pack to be tested on an unpaved road, evaluating whether the torsional strength of the battery pack to be tested can meet the requirements of the working conditions, and further accurately evaluating the reliability of the strength safety design of the battery pack to be tested.

[0080] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A testing device for performing fatigue testing on a battery pack to be tested, characterized in that: include: Pedestal; A first bracket is located on the base, and one side of the first bracket is connected to the base; A second bracket is located on the first bracket and has a first end and a second end, the first end is connected to the base, the second end is connected to the other side of the first bracket, and an installation space is provided on the second bracket, and the installation space is used to install the battery pack to be tested; Among them, the second end has the freedom to rotate around the long axis of the second bracket, and the first bracket is used to apply two load forces in opposite directions to the second bracket, so that the second end rotates around the long axis of the second bracket and drives the battery pack to be tested to twist.

2. The testing device according to claim 1, characterized in that: The first bracket comprises: A fixing part, fixed on the base; a first constraint portion, located on the fixing portion, the first constraint portion being rotatably connected to the fixing portion, the first constraint portion having a degree of freedom to rotate about a first direction, and the first direction being parallel to the long axis of the second bracket; The first movable part is located on the first constraint part, one side of the first movable part is rotationally connected to the first constraint part, the other side of the first movable part is connected to the second end, and the first movable part has the freedom to rotate around the first direction.

3. The testing device according to claim 2, characterized in that: The first restraining portion includes a first limiting sub-portion and a first connecting sub-portion arranged on the first limiting sub-portion, the first movable portion is rotatably connected to the first connecting sub-portion through a first connecting member, and the first limiting sub-portion is rotatably connected to the fixed portion through a second connecting member.

4. The testing device according to claim 3, characterized in that: The first limiting sub-portion extends along a second direction, and the second direction intersects with the first direction; The first bracket includes two first movable parts, the first restraining part includes two first connecting sub-parts, and in the orthographic projection pattern on the base, the two first connecting sub-parts are respectively located on both sides of the fixing part in the second direction.

5. The testing device according to claim 4, characterized in that: The first bracket further comprises at least two groups of loading parts, each of which is fixed on the first limiting sub-part; In the orthographic projection pattern on the base, a group of the loading parts is correspondingly arranged on a side of the first connecting sub-part away from the fixing part.

6. The testing device according to claim 3, characterized in that: The first limiting sub-portion includes a first bottom plate, a first side plate and a first top plate, the first side plate is connected between the first bottom plate and the first top plate, the first bottom plate is located on a side of the first side plate close to the fixing portion, and the first top plate is located on a side of the first side plate away from the fixing portion; The first connecting sub-part is fixed to the first bottom plate, a limiting opening is provided on the first top plate, and part of the first movable part passes through the limiting opening and is rotatably connected to the first connecting sub-part.

7. The testing device according to claim 6, characterized in that: The limiting opening extends along the second direction.

8. The testing device according to any one of claims 4 to 7, characterized in that: The testing device further includes a third bracket, the third bracket being located between the base and the second bracket, and the third bracket including: a second constraint portion, located on the base, wherein a first connecting arm, a second connecting arm and a third connecting arm are sequentially arranged in an extension direction of the second constraint portion, the second constraint portion is connected to the base through the first connecting arm, the second connecting arm and the third connecting arm respectively, the extension direction of the second connecting arm intersects with the extension direction of the first connecting arm, and the extension direction of the second connecting arm intersects with the extension direction of the third connecting arm; The second movable portion is located on the second restraining portion, one side of the second movable portion is connected to the second restraining portion, and the other side of the second movable portion is connected to the first end.

9. The testing device according to claim 8, characterized in that: The first movable portion is rotatably connected to the second end via a third connecting member, and the axial direction of the third connecting member is parallel to the short axis of the second bracket; The second movable portion is rotatably connected to the first end via a fourth connecting member, and the axial direction of the fourth connecting member is parallel to the short axis of the second bracket; The axial direction of the first connecting member is parallel to the first direction, and the axial direction of the second connecting member is parallel to the first direction; The second movable portion is rotatably connected to the second restraining portion via a fifth connecting member, and the axial direction of the fifth connecting member is parallel to the first direction; The first connecting arm, the second connecting arm and the third connecting arm are respectively connected to the second constraint portion through a sixth connecting member, and the axial direction of the sixth connecting member is parallel to the first direction. The first connecting arm, the second connecting arm and the third connecting arm are respectively connected to the base through a seventh connecting member, and the axial direction of the seventh connecting member is parallel to the first direction.

10. The testing device according to claim 9, characterized in that: The second restraining portion includes a second limiting sub-portion and a second connecting sub-portion; The second position-limiting sub-portion includes a second bottom plate, a second side plate and a second top plate, the second side plate is connected between the second bottom plate and the second top plate, the second bottom plate is located on a side of the second side plate close to the base, and the second top plate is located on a side of the second side plate away from the base; The second connecting sub-part is fixed to the second top plate, and an avoidance opening is provided on the second bottom plate. Part of the first connecting arm, part of the second connecting arm, and part of the third connecting arm pass through the avoidance opening to be connected to the second connecting sub-part.

11. The testing device according to claim 10, characterized in that: The second top plate is provided with a plurality of first fixing holes, the second connecting sub-part is provided with at least one second fixing hole, and the group of second fixing holes is fixedly connected to any group of the first fixing holes through an eighth connecting member.

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