Nested assembly of power battery module

Abstract

The utility model discloses a nesting component of a power battery module, which comprises a battery module group and a mounting seat, a battery pack is arranged in the battery module group, the nesting component further comprises a plug, an external hanging box and a plug-in component, the plug is mounted at the upper end of the battery module group, and a mounting hole matched with the plug is formed in the mounting seat; the plug-in boxes are in one-to-one correspondence with the corresponding battery module groups, the plug-in boxes are fixed above the mounting seat, the bottoms of the plug-in boxes are provided with guide cavities for insertion of the plug-in heads, the plug-in assemblies are arranged on the inner walls of the plug-in boxes and distributed on the inner walls of the guide cavities, the plug-in assemblies comprise sleeves, plug pins and springs are movably arranged in the sleeves, and the two ends of the springs abut against the plug pins and inner cavities of the sleeves respectively; the spring applies thrust to the bolt, and the side wall of the plugging head is provided with a locking opening corresponding to the bolt. In the prior art, in the process of testing and installing a battery module group to optimize the battery module group, when the power battery module has an accident risk, the whole installation seat needs to be put into a water sinking pool, and targeted disposal of a single power battery module is not facilitated.

Description

Technical Field

[0001] The utility model relates to a vehicle-mounted battery test, in particular to a nested assembly of a power battery module. Background Art

[0002] With the development of technology, the current carrier of the battery module group is set up as a whole by using a shell, and the battery module group usually retains relevant interfaces, which are mainly used to charge and discharge the battery packs in the battery module group. Its battery module group usually needs to be installed on the test vehicle to detect the risk of collision and test the stability of the battery module group under overload operation. Among them, the battery module group is the power supply source of the vehicle. Considering the different uses of the vehicle, during the test process, the battery module group usually needs to be connected to the discharge equipment to simulate the factor experiment through the discharge process. In order to determine the difference in the use of battery module groups with different battery packs installed.

[0003] At present, on the test lines where actual tests are mainly concentrated, the battery module groups are transported and pulled for installation by robotic arms. The insertion and removal of battery module groups usually require manual or mechanical assistance. The robotic arm is placed from the top of the mounting seat into the reserved slot of the mounting seat for fixing. Considering the possible safety risks of overload operation of power battery modules and safety tests, mainstream tests require the installation of a sinking tank under the mounting seat. When an accident occurs to the tested battery module group, the entire mounting seat is placed in the sinking tank. If multiple battery module groups are tested on a mounting seat, the battery module groups on a mounting seat may all be affected, delaying the test efficiency. Therefore, it is worth studying how to optimize the fixation and release of power battery modules in a targeted manner. Utility Model Content

[0004] The purpose of the utility model is to provide a nested assembly of a power battery module in order to optimize the battery module group in cooperation with a robotic arm during testing and installation. If an unexpected risk occurs to the power battery module, the entire mounting base needs to be put into a sinking tank, which is not conducive to the targeted disposal of a single power battery module.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A nested component of a power battery module comprises a battery module group and a mounting seat, wherein the battery module group has a built-in battery pack, and the battery pack is used to electrically connect to a discharge device, and the discharge device is used to test the battery pack. The component also comprises a plug-in head, an external box and a plug-in assembly, wherein the plug-in head is mounted on the upper end of the battery module group, and the mounting seat is provided with a mounting hole adapted to the plug-in head, and the plug-in head is used to be inserted into the mounting hole and extend outwardly; the external box corresponds to the corresponding battery module group one by one, the external box is fixed above the mounting seat, and a guide cavity for inserting the plug-in head is provided at the bottom of the external box, the plug-in assembly is as for the inner wall of the external box, and is distributed on the inner wall of the guide cavity, and the plug-in assembly is used to resist the plug-in head and restrict the battery module group on the mounting seat. Among them, the above-mentioned plug-in assembly includes a sleeve, in which a pin and a spring are movably arranged, and the two ends of the above-mentioned spring respectively contact the pin and the inner cavity of the sleeve; the spring applies a thrust to the pin, and the front end of the sleeve is provided with an opening for the pin to extend, so that the front end of the pin extends from the sleeve into the guide cavity; wherein, the side wall of the above-mentioned plug-in head is provided with a lock corresponding to the pin, and when fixing the battery module group, the above-mentioned pin is used to contact the lock to complete the fixation of the plug-in head; when the pin is away from the lock, the plug-in head is released, so that the battery module group is separated from the mounting seat by its own weight.

[0007] The technical concept is: a single battery module group is placed inverted on the mounting seat, and the battery module group is inserted into the mounting seat through the plug-in head and extends into the external box, and the battery module group is fixed by the external box and the plug-in assembly. The external box and the battery module group correspond one to one, so that multiple battery module groups can be installed on one mounting seat. When a battery module group is at risk, the battery module group is released by the corresponding plug-in assembly, thereby retaining the battery module groups on other mounting seats.

[0008] Preferably, the plug-in assembly further comprises a hollow insulating cylinder, a push rod is provided in the insulating cylinder, an opening for the push rod to pass through is provided at the rear end of the sleeve, and the inner cavity of the insulating cylinder is connected to the inner cavity of the sleeve; the push rod is used to pass through the spring, extend into the sleeve and connect the pin.

[0009] A further technical solution is that the central axes of the above-mentioned sleeve and the insulating tube overlap, the inner cavity of the above-mentioned insulating tube matches the size of the opening at the rear end of the sleeve, a support plate is provided in the above-mentioned insulating tube, and an electromagnet corresponding to the push rod is provided on the above-mentioned support plate, and the above-mentioned electromagnet is used to adsorb the push rod and move the push rod toward the support plate.

[0010] A further technical solution is that a magnetic attraction portion is provided at the rear end of the push rod, and an insulating portion is provided at the front end of the push rod, the magnetic attraction portion is used to resist the electromagnet, and the insulating portion is used to extend into the sleeve.

[0011] Preferably, the above-mentioned latch includes a limit pin and a push plate, the outer contour of the push plate is consistent with the cross-sectional contour of the inner cavity of the sleeve, the above-mentioned latch contacts the spring through the push plate, the above-mentioned limit pin is arranged at the front end of the push plate, and the above-mentioned limit pin is used to extend into the guide cavity and resist the plug head.

[0012] A further technical solution is that the end of the limit pin is inclined from top to bottom toward the push plate, the side wall of the plug head is provided with a lock hole adapted to the outer contour of the limit pin, and the upper end of the plug head is provided with a guide slope, which is used to apply thrust to the limit pin when the plug head is inserted into the guide cavity.

[0013] Preferably, a slide rail and a slide bar are respectively arranged on both sides of the battery module group, and the slide rail and the slide bar are vertically arranged on the battery module group, and the slide bar is adapted to the slide rail.

[0014] A further technical solution is that there are multiple battery module groups, the number of the external boxes is corresponding to the number of battery module groups, and two adjacent battery module groups are spliced ​​together by slide bars and rails to form a test piece.

[0015] A further technical solution is that a bus bar is provided in the slide rail, and a terminal head corresponding to the bus bar is provided on the slide bar, and the terminal head and the bus bar are respectively connected to the positive and negative poles of the battery pack in the battery module group through a power-off switch, and the test piece is used for sliding contact connection with the discharge device through the terminal head and the bus bar.

[0016] Compared with the prior art, the beneficial effects of the utility model are at least one of the following:

[0017] The utility model configures a plug-in head on the battery module group and designs an external box to fix the plug-in head. The external box locks the plug-in head through a spring and a latch built into the plug-in assembly, thereby achieving rapid assembly and disassembly. Its fixing method reduces the use of fixing elements such as bolts and screws. Its structure allows the battery module group to be invertedly installed on the mounting seat when the battery module group needs to be tested, making it easy for the battery module group to fall into the sinking tank.

[0018] A plurality of plug-in assemblies can be arranged in the external box of the utility model, and the plug-in head can be supported at multiple points by means of a plurality of built-in springs and pins of the plug-in assemblies; the mounting hole of the mounting seat can restrict the plug-in head laterally, while the plug-in assemblies can restrict the plug-in head longitudinally; and a tensioner is arranged in the external box, which can also cooperate with the plug-in assemblies to reduce the risk of loosening caused by external factors, and further improve the stability of the locking of the plug-in assemblies and the plug-in head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Figure 2This is a schematic diagram of the locking structure of the utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the utility model in the insertion state.

[0022] Figure 4 This is a working schematic diagram of the guide slope of the utility model.

[0023] Description of reference numerals:

[0024] 1-battery module group, 2-mounting seat, 3-plug-in head, 4-external box, 5-plug-in assembly, 6-pin, 8-tensioner, 101-slide rail, 102-slide bar, 301-lock, 302-guide slope, 401-guide cavity, 402-tension groove, 501-sleeve, 502-insulating cylinder, 503-spring, 504-push rod, 505-, 506-electromagnet, 507-magnetic suction part, 508-insulating part, 601-limit pin, 602-push plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] refer to Figure 1 and Figure 2 As shown, one embodiment of the utility model is a nested assembly of a power battery module, comprising a battery module group 1 and a mounting seat 2, wherein the battery module group 1 has a built-in battery pack, and the battery pack is used to electrically connect to a discharge device, and the battery pack is tested by the discharge device, wherein the discharge device is an existing test device, and the discharge device is electrically connected to the battery module group 1 through a cable, and the discharge device works as a load to simulate an overload test on the battery module group 1.

[0027] The nested components of the power battery module include a plug-in head 3, an external box 4 and a plug-in component 5. The external box 4 is made of plastic with sufficient hardness. Ears are provided on both sides of the external box 4 and are fixed above the mounting base 2 through the ears.

[0028] In order for the battery module group 1 to better bear its own weight, the plug head 3 is installed at the upper end of the battery module group 1, and the mounting seat 2 is provided with a mounting hole adapted to the plug head 3, and the plug head 3 is used to be inserted into the mounting hole and extend outward.

[0029] Among them, the number of the above-mentioned external boxes 4 corresponds to the battery module group 1, the specific positions of the above-mentioned external boxes 4 correspond to the mounting holes on the mounting base 2, the external boxes 4 are fixed above the mounting base 2, and a guide cavity 401 for inserting the plug head 3 is arranged at the bottom of the external box 4; its guide cavity 401 can be connected with the mounting hole of the mounting base 2, and in principle, the size of the mounting hole is adapted to the size of the guide cavity 401, so as to facilitate the external fit of the plug head 3 to the guide cavity 401, so that during the insertion of the plug head 3 into the guide cavity 401, the plug head 3 will not shake abnormally in the guide cavity 401.

[0030] The plug-in assembly 5 is placed on the inner wall of the external box 4 , wherein one external box 4 has at least two plug-in assemblies 5 , and the plug-in assembly 5 is installed on the inner wall of the external box 4 in an inlaid manner.

[0031] For reference, when there are only two plug-in assemblies 5, the plug-in assemblies 5 are relatively arranged with the central axis of the external hanging box 4 as the center, so as to ensure the relativity of the acting force, which is beneficial to the stability of the installation.

[0032] For reference, when there are more than two plug-in components 5 , the plug-in components 5 are arranged around the inner wall of the external box 4 with the central axis of the external box 4 as the center.

[0033] Among them, reference Figure 3 As shown, the plug-in assembly 5 is used to abut against the plug-in head 3 and restrict the battery module group 1 on the mounting seat 2. The plug-in assembly 5 includes a sleeve 501, in which a latch 6 and a spring 503 are movably arranged, and the two ends of the spring 503 abut against the latch 6 and the inner cavity of the sleeve 501 respectively; in order to better ensure the load transmission of the spring, the openings at both ends of the sleeve 501 are set smaller than the inner cavity size of the sleeve 501, so that the spring 503 can directly abut against the end of the sleeve 501. The spring 503 applies a thrust to the latch 6, and the front end of the sleeve 501 is provided with an opening for the latch 6 to extend, so that the front end of the latch 6 extends from the sleeve 501 into the guide cavity 401; wherein, the channel in the middle of the spring 503 can cooperate with the opening to form a channel. wherein, the maximum cross-sectional size of the latch 6 is adapted to the sleeve 501 to ensure that the thrust of the spring 503 does not cause displacement to the movement of the latch 6.

[0034] The side wall of the plug head 3 is provided with a lock hole 301 corresponding to the plug pin 6, and the plug pin 6 is used to cooperate with the lock hole 301 to fix or release the plug head 3. The plug head 3 is fixed and released by the external box 4, so that the battery module group 1 is separated from the mounting seat 2 by its own weight.

[0035] The lock opening 301 can surround the latch pin 6 , thereby reducing the posture restriction of the plug head 3 when being inserted into the external box 4 .

[0036] Considering that the battery module group 1 may be installed in a fixed posture on the mounting base 2 with the assistance of a robotic arm, so that the plug head 3 is also inserted into the external box 4 in a fixed posture, therefore, the lock hole 301 on the side wall of the latch 6 corresponds to the plug assembly 5.

[0037] During operation, the battery module group 1 is moved from the bottom of the mounting seat 2 by a mechanical arm or other means, so that the plug head 3 is inserted into the mounting hole of the mounting seat 2, and then the battery module group 1 is moved upward so that the plug head 3 extends into the guide cavity 401 of the external box 4, until the lock 301 of the plug head 3 moves to the position of the plug pin 6 of the plug assembly 5, and the plug pin 6 is inserted into the lock 301 under the action of the spring to complete the locking. In an unexpected situation, the corresponding battery module group 1 usually falls under the action of its own weight by moving the plug pin 6 away from the lock 301, thereby breaking away from the mounting seat 2 and falling into the sinking tank.

[0038] Based on the above embodiments, reference Figure 2 and Figure 3 As shown, another embodiment of the utility model is that the plug-in assembly 5 further includes a hollow insulating cylinder 502, the insulating cylinder 502 is made of plastic material, and the insulating cylinder 502 has a certain thickness to ensure sufficient hardness; a push rod 504 is provided in the insulating cylinder 502, and the push rod 504 is slidably arranged in the insulating cylinder 502, and an opening for the push rod 504 to pass through is provided at the rear end of the sleeve 501, and the opening size is adapted to the push rod 504, and the inner cavity of the insulating cylinder 502 is connected with the inner cavity of the sleeve 501, so that the push rod can extend from the insulating cylinder 502 into the sleeve 501, and the push rod 504 is used to pass through the spring 503 to extend into the sleeve 501 and connect the bolt 6. When locking, the bolt 6 pulls the push rod 504 to keep moving forward under the influence of the spring 503 itself. When it is necessary to release, the push rod 504 moves backward to drive the bolt 6 to move backward and overcome the influence of the spring 503.

[0039] Furthermore, in order to better control the backward movement of the push rod 504, the central axes of the sleeve 501 and the insulating tube 502 overlap, so that the push rod 504 moves relatively smoothly in the sleeve 501 and the insulating tube 502, avoiding the inner walls of the sleeve 501 and the insulating tube 502 from hindering the movement of the push rod 504.

[0040] Among them, the inner cavity of the above-mentioned insulating tube 502 is consistent with the size of the rear end opening of the sleeve 501, thereby reducing the risk of shaking when the push rod 504 moves. The above-mentioned insulating tube 502 is provided with a support plate 505, and the support plate 505 is arranged at the rear part of the insulating tube 502. The above-mentioned support plate 505 is provided with an electromagnet 506 corresponding to the push rod 504. When the electromagnet 506 is energized, the electromagnet 506 generates suction. The above-mentioned electromagnet 506 is used to absorb the push rod 504, so that the push rod 504 moves toward the support plate 505, and realizes the backward movement of the push rod 504. When the push rod 504 hits the electromagnet 506, the push rod 504 reaches the maximum stroke, which needs to satisfy the requirement that the pin 6 is away from the lock mouth 301 to avoid the pin 6 restricting the plug head 3.

[0041] For further reference, Figure 2 As shown, in order to avoid excessive influence of the magnetization of the electromagnet 506, a magnetic attraction portion 507 is provided at the rear end of the push rod 504, and the magnetic attraction portion 507 is made of a material that can be magnetized by the electromagnet 506, such as iron. An insulating portion 508 is provided at the front end of the push rod 504, and the insulating portion 508 is made of a material that cannot be magnetized by the electromagnet 506, such as plastic. When the electromagnet 506 is magnetized, its magnetic attraction is only directed to the magnetic attraction portion 507. The magnetic attraction portion 507 is used to resist the electromagnet 506, and the insulating portion 508 is driven to move by the magnetic attraction portion 507. At the same time, because the insulating portion 508 has insulating properties, the insulating portion 508 extends into the sleeve 501 and will not affect the spring inside the sleeve 501.

[0042] Based on the above embodiment, another embodiment of the utility model is that, in order to optimize the movement of the latch 6 in the sleeve 501, the latch 6 includes a limit pin 601 and a push plate 602, and the outer contour of the push plate 602 is consistent with the cross-sectional contour of the inner cavity of the sleeve 501, so that the push plate 602 can only move forward and backward in the sleeve 501, and will not shake at will. At the same time, the latch 6 contacts the spring 503 through the push plate 602, and the limit pin 601 is arranged at the front end of the push plate 602. The limit pin 601 is used to extend into the guide cavity 401 and resist the plug head 3. The limit pin 601 can maintain a relative position relative to the push plate 602, so that the limit pin 601 has a stable moving path during the movement, which is conducive to the limit pin 601 extending or retracting from the opening at the front end of the sleeve 501.

[0043] For further reference, Figure 3 and Figure 4As shown, considering that the limit pin 601 is in an extended state under normal conditions, in order to ensure the stable insertion of the plug head 3, the end of the limit pin 601 is inclined from top to bottom toward the push plate 602, wherein the upper end of the limit pin 601 is a plane, and the side wall of the plug head 3 is provided with a locking hole 301 adapted to the outer contour of the limit pin 601, and the locking hole 301 is a right-angled trapezoid. When the limit pin 601 is inserted into the locking hole 301, under the action of the right-angled trapezoid, the upper end of the locking hole 301 can contact the plane of the upper end of the limit pin 601.

[0044] In order to prevent the plug head 3 from being hit by the limit pin 601 during the insertion process, refer to Figure 4 As shown, a guide slope 302 is provided at the upper end of the plug head 3, and the guide slope is used to apply a thrust to the stop pin 601 when the plug head 3 is inserted into the guide cavity 401. The guide slope 302 can directly act on the end of the stop pin 601, and as the guide slope 302 moves upward, the guide slope 302 gradually applies a reaction force to the stop pin 601, and under the influence of the reaction force, the end of the stop pin 601 is retracted to the outer wall position of the plug head 3. Thus, the extended stop pin 601 blocks the insertion process of the plug head 3.

[0045] Based on the above embodiments, reference Figure 1 and Figure 3 As shown, another embodiment of the utility model is to better reduce the risk of shaking of the plug head 3 in the guide cavity 401. A tension groove 402 is provided in the above-mentioned external box 4, wherein the cross-sectional dimension of the tension groove 402 is smaller than the cross-sectional dimension of the guide cavity 401, the above-mentioned tension groove 402 is connected to the top of the guide cavity 401, and a tensioner 8 is provided in the tension groove 402, wherein the tensioner 8 is an existing commodity, and can be an existing spring reset mechanism, wherein the fixed end of the tensioner 8 is installed at the bottom of the tension groove 402, and the movable end of the tensioner 8 is used to extend into the guide cavity 401 and abut against the upper end of the plug head 3, and the tensioner 8 applies downward pressure to the plug head 3.

[0046] For reference, in order to better enable the tensioner 8 to act on the plug head 3, multiple tensioners 8 can be provided, and a contact plate is provided at the lower end of the tensioner 8 to apply pressure to the plug head 3. If necessary, the upper end of the plug head 3 adopts a planar structure, so as to facilitate load transfer between the plug head 3 and the tensioner 8.

[0047] It is worth noting that, although the mounting hole of the mounting seat 2 can restrict the plug head 3, the process of inserting the plug head 3 into the mounting hole needs to be sufficiently smooth so that the matching between the mounting hole and the plug head 3 is a clearance match. Similarly, there is obviously a tolerance gap between the inner wall of the guide cavity 401 and the plug head 3. The tensioner 8 applies downward pressure to the plug head 3, so that after the plug pin 6 is inserted into the lock 301, the upper end of the lock 301 contacts the upper end of the plug pin 6, and the friction generated by the contact can reduce the risk of shaking.

[0048] Based on the above embodiment, another embodiment of the utility model is that the above battery module group 1 is provided with a slide rail 101 and a slide bar 102 on both sides, wherein the slide rail 101 and the slide bar 102 are both existing products. The setting of the slide rail 101 and the slide bar 102 is mainly used for splicing in specific circumstances to meet the requirements of some test scenarios. The above slide rail 101 and the slide bar 102 are vertically arranged on the battery module group 1, and the above slide bar 102 is adapted to the slide rail 101.

[0049] There are multiple battery module groups 1 , and the number of the external boxes 4 corresponds to that of the battery module groups 1 . Two adjacent battery module groups 1 are spliced ​​together through the slide bar 102 and the slide rail 101 to form a test piece.

[0050] Furthermore, considering that there may be a need for electrical connection between two adjacent battery module groups 1, a busbar is provided in the slide rail 101, and the above-mentioned slide bar 102 is provided with a terminal head corresponding to the busbar. The above-mentioned terminal head and busbar are respectively connected to the positive and negative poles of the battery group in the battery module group 1 through the power-off switch, and the above-mentioned test piece is used for sliding connection with the discharge device through the terminal head and the busbar. This requirement is usually considered when conducting relevant tests on model vehicles, and the plug-in assembly 5 meets sufficient support effects before the sliding connection method is considered for setting, so as to facilitate the replacement or release of the entire test piece. For example, when the test vehicle is impacted, the test piece is subjected to a throwing combustion test or a throwing damage test.

[0051] The "one embodiment", "another embodiment", "embodiment", "preferred embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0052] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to the modifications and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A nested assembly of a power battery module, comprising a battery module group (1) and a mounting seat (2), wherein the battery module group (1) has a built-in battery pack, the battery pack is used to be electrically connected to a discharge device, and the discharge device is used to perform a battery pack test, characterized in that: Also includes: A plug head (3), the plug head (3) being mounted on the upper end of the battery module group (1), the mounting seat (2) being provided with a mounting hole adapted to the plug head (3), the plug head (3) being used to be inserted into the mounting hole and extend outwards; An external box (4), the external box (4) corresponding to the battery module group (1), the external box (4) being fixed above the mounting seat (2), and a guide cavity (401) for inserting the plug head (3) being provided at the bottom of the external box (4); A plug-in assembly (5), the plug-in assembly (5) being arranged on the inner wall of the external box (4) and distributed on the inner wall of the guide cavity (401), the plug-in assembly (5) being used to abut against the plug-in head (3) and restrict the battery module group (1) on the mounting seat (2); The plug-in assembly (5) comprises a sleeve (501), wherein a latch (6) and a spring (503) are movably arranged in the sleeve (501), and the two ends of the spring (503) respectively contact the latch (6) and the inner cavity of the sleeve (501); the spring (503) applies a thrust to the latch (6), and the front end of the sleeve (501) is provided with an opening for the latch (6) to extend, so that the front end of the latch (6) extends from the sleeve (501) into the guide cavity (401); the side wall of the plug head (3) is provided with a lock hole (301) corresponding to the latch (6), and the latch (6) is used to cooperate with the lock hole (301) to fix or release the plug head (3), so that the battery module group (1) is separated from the mounting seat (2) by its own weight.

2. The nested assembly of power battery modules according to claim 1, characterized in that: The plug-in assembly (5) further comprises a hollow insulating cylinder (502), a push rod (504) being arranged in the insulating cylinder (502), an opening for the push rod (504) to pass through being arranged at the rear end of the sleeve (501), and the inner cavity of the insulating cylinder (502) is communicated with the inner cavity of the sleeve (501); the push rod (504) is used to pass through the spring (503), extend into the sleeve (501) and connect with the plug (6).

3. The nested assembly of power battery modules according to claim 2, characterized in that: The central axes of the sleeve (501) and the insulating tube (502) overlap, the inner cavity of the insulating tube (502) matches the size of the rear end opening of the sleeve (501), a support plate (505) is provided in the insulating tube (502), and an electromagnet (506) corresponding to the push rod (504) is provided on the support plate (505), and the electromagnet (506) is used to absorb the push rod (504) so ​​that the push rod (504) moves toward the support plate (505).

4. The nested assembly of power battery modules according to claim 3, characterized in that: The rear end of the push rod (504) is provided with a magnetic attraction portion (507), and the front end of the push rod (504) is provided with an insulating portion (508). The magnetic attraction portion (507) is used to resist the electromagnet (506), and the insulating portion (508) is used to extend into the sleeve (501).

5. The nested assembly of power battery modules according to claim 1, characterized in that: The latch (6) comprises a limit pin (601) and a push plate (602); the outer contour of the push plate (602) matches the cross-sectional contour of the inner cavity of the sleeve (501); the latch (6) contacts the spring (503) through the push plate (602); the limit pin (601) is arranged at the front end of the push plate (602); and the limit pin (601) is used to extend into the guide cavity (401) and abut against the plug head (3).

6. The nested assembly of power battery modules according to claim 5, characterized in that: The end of the limit pin (601) is inclined from top to bottom toward the push plate (602), the locking opening (301) of the side wall of the plug head (3) is adapted to the outer contour of the limit pin (601), and a guide slope (302) is provided at the upper end of the plug head (3), and the guide slope is used to apply a thrust to the limit pin (601) when the plug head (3) is inserted into the guide cavity (401).

7. The nested assembly of power battery modules according to claim 1, characterized in that: The external box (4) is provided with a tension groove (402), the tension groove (402) is connected to the top of the guide cavity (401), and a tensioner (8) is provided in the tension groove (402), the tensioner (8) is used to contact the upper end of the plug head (3), and the tensioner (8) applies downward pressure to the plug head (3).

8. The nested assembly of power battery modules according to claim 1, characterized in that: A slide rail (101) and a slide bar (102) are respectively provided on both sides of the battery module group (1); the slide rail (101) and the slide bar (102) are vertically arranged on the battery module group (1); and the slide bar (102) is adapted to the slide rail (101).

9. The nested assembly of power battery modules according to claim 8, characterized in that: There are a plurality of battery module groups (1), the number of the external boxes (4) corresponds to the number of the battery module groups (1), and two adjacent battery module groups (1) are spliced ​​together via a slide bar (102) and a slide rail (101) to form a test piece.

10. The nested assembly of power battery modules according to claim 9, characterized in that: A busbar is provided in the slide rail (101), and a terminal head corresponding to the busbar is provided on the slide bar (102). The terminal head and the busbar are respectively connected to the positive and negative electrodes of the battery pack in the battery module group (1) through a power-off switch.

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