Battery module safety testing device and method

Abstract

The application discloses a kind of battery module safety regulation test device and method, wherein, test device includes first probe mechanism, second probe mechanism, battery module to be measured, battery module tray and industrial computer;First probe mechanism is provided with multiple groups of first probe;Second probe mechanism is provided with side wall probe and shell probe;The positive pole of the battery module to be measured is connected with its corresponding positive pole column;The battery module to be measured is loaded on the upper surface of battery module tray;Industrial computer controls the electrical connection or electrical disconnection between first probe, and test voltage is applied between the first probe that is electrically disconnected, test voltage is applied between the side wall probe and the first probe that is electrically disconnected, test voltage is applied between the shell probe and the first probe that is electrically disconnected;The application realizes the automatic fast test of the insulation voltage resistance performance of power battery module assembly, reduces test cost, improves test efficiency, and is suitable for batch detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery module safety testing, and particularly relates to a battery module safety testing device and method. BACKGROUND

[0002] For a battery module, safety testing is required to ensure that it will not cause leakage, short circuit, etc., that is, it needs to be tested for inter-cell insulation, cell pole to side wall insulation, module positive to shell insulation, and voltage resistance. A battery module is composed of multiple cells, and the traditional safety testing method requires multiple tests on different points. The testing procedure is too cumbersome, the detection efficiency is low, and it cannot adapt to mass production. The above problems need to be solved. SUMMARY

[0003] The purpose of the present application is to provide a battery module safety testing device and method. The battery module safety testing device is used for insulation voltage resistance testing of high-voltage elements and devices of a battery module. It is a special device for detecting whether the product is leaking, whether it is well grounded, and whether it will harm personal safety. The main detection items are voltage, leakage current, insulation resistance, and ground resistance, to solve the problems raised in the background technology.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a battery module safety testing device, comprising:

[0005] A first probe mechanism is provided with a plurality of first probes;

[0006] A second probe mechanism is provided with a side wall probe and a shell probe;

[0007] A battery module to be tested includes a plurality of cells, cell positive poles, side walls, and shells. The cells have cell positive poles, and the cell positive poles are connected to their corresponding cell positive poles;

[0008] A battery module tray is provided, and the battery module to be tested is loaded on the upper surface of the battery module tray;

[0009] An industrial computer is used to control the electrical connection or disconnection between a plurality of first probes, and to apply a test voltage between the first probes that are electrically disconnected;

[0010] Each of the plurality of positive poles of the battery cell is arranged with a corresponding group of the first probes, the side wall is arranged with the side wall probe, and the shell is arranged with the shell probe; the first probe mechanism has a first working position in a first direction, in which the first probe mechanism is close to the battery module to be tested, and a first separation position in which the first probe mechanism is separated from the battery module to be tested; when the first probe mechanism is in the first working position, the first probe is electrically connected to the corresponding positive pole of the battery cell; when the first probe mechanism is in the first working position, the second probe mechanism has a second working position in a second direction, in which the second probe mechanism is close to the battery module to be tested, and a second separation position in which the second probe mechanism is separated from the battery module to be tested; when the second probe mechanism is in the second working position, the side wall probe is electrically connected to the side wall, and the shell probe is electrically connected to the shell; the first direction is perpendicular to the second direction.

[0011] Further, the top plate and the leg are connected;

[0012] The first probe mechanism further comprises:

[0013] The first cylinder comprises a first cylinder body and a first piston rod;

[0014] The first mounting plate is connected to the end of the first piston rod, and a plurality of first probes are connected to the first mounting plate;

[0015] The second probe mechanism further comprises:

[0016] The second cylinder comprises a second cylinder body and a second piston rod, and the second cylinder body is connected to the first mounting plate;

[0017] The second mounting plate is connected to the end of the second piston rod, and the side wall probe and the shell probe are respectively connected to the second mounting plate;

[0018] The industrial computer controls the first cylinder to make the first probe mechanism in the first working position or the first separation position, and controls the second cylinder to make the second probe mechanism in the second working position or the second separation position.

[0019] Further, the limiting mechanism comprises:

[0020] The first flange is connected to the top plate, and the center hole of the first flange is concentric with the avoiding hole;

[0021] The second flange is connected to the upper surface of the first mounting plate;

[0022] a striker connected with the second flange, the striker being provided with a striker hole concentric with the center hole of the first flange;

[0023] a limiting column connected with the second flange, the limiting column being provided with a limiting hole, the limiting hole being provided in the avoiding hole, the center hole of the first flange and the striker hole, and the limiting column being capable of sliding in the center hole of the second flange;

[0024] a mounting block fixedly installed on the top end of the limiting column;

[0025] a limiting switch installed on the mounting block, when the first piston rod moves downward, the limiting switch moves downward with the limiting column, and when the limiting switch touches the striker, the first piston rod stops moving downward;

[0026] a stopper installed on the mounting block, when the stopper moves downward with the limiting column and abuts against the striker, the first mounting plate stops moving downward, so that the first probe mechanism is in the first working position;

[0027] the limiting mechanism is used for limiting the first working position and the first separated position, and limiting the first probe mechanism to move in the first direction.

[0028] Further, the top plate is provided with a first piston rod avoiding hole, the first cylinder body is provided with a first cylinder seat, the first cylinder seat is connected with the top plate, and the first piston rod is provided in the first piston rod avoiding hole.

[0029] Further, the second cylinder includes a second cylinder seat, and the second cylinder seat is connected with the side wall of the first mounting plate.

[0030] Further, the first probe mechanism further includes a first probe seat, the first probe seat is connected with the first mounting plate, one end of the first probe is connected with the first probe seat, and when the first probe mechanism is in the first working position, the other end of the first probe abuts against the positive electrode of the battery cell.

[0031] Further, the second probe mechanism includes a second probe seat, the second probe seat is connected with the second mounting plate, one end of the side wall probe and one end of the shell probe are respectively connected with the second probe seat, and when the second probe mechanism is in the second working position, the other end of the side wall probe abuts against the side wall and the other end of the shell probe abuts against the shell.

[0032] Further, when the first probe mechanism is located at the first working position and the second probe mechanism is located at the second separated position, the industrial computer controls the odd first probe series and the even first probe series, applies a test voltage between the odd first probe and the even first probe, and tests the resistance between the odd first probe and the even first probe to detect whether the positive poles of the battery cells are insulated.

[0033] Further, when the first probe mechanism is located at the first working position and the second probe mechanism is located at the second working position, the industrial computer controls all the first probes to be in series, applies a test voltage between the first probes in series and the side wall probe, tests the resistance between the positive pole of the battery cell and the side wall probe to test whether the positive pole of the battery cell and the side wall are insulated, applies a test voltage between the first probes in series and the shell probe, and tests the resistance between the positive pole of the battery cell and the shell probe to test whether the positive pole of the battery cell and the shell are insulated.

[0034] In another aspect, a battery module safety testing method is provided, which includes:

[0035] The battery module tray transports the battery module to below the first mounting plate and is lifted to be positioned;

[0036] The first cylinder drives the first probe mechanism to move to the first working position, so that a plurality of groups of first probes are respectively in contact with corresponding positive poles of the battery cells to complete electrical connection;

[0037] The second cylinder drives the second probe mechanism to move to the second working position, so that the side wall probe and the shell probe are respectively in contact with the side wall and the shell to complete electrical connection;

[0038] The inter-battery cell voltage resistance test is performed, the industrial computer controls the odd first probe series and the even first probe series to realize the series connection of the odd positive poles and the series connection of the even positive poles, applies 2700VDC between the odd first probe and the even first probe for 2 seconds, and if the resistance is greater than 500MΩ, the inter-battery cell voltage resistance test is qualified;

[0039] The inter-battery cell insulation test is performed, the industrial computer controls the odd first probe series and the even first probe series to realize the series connection of the odd positive poles and the series connection of the even positive poles, applies 500VDC between the odd first probe and the even first probe for 2 seconds, and if the resistance is greater than 100MΩ, the inter-battery cell insulation test is qualified, otherwise, an alarm is given and the product is rejected for repair;

[0040] Carry out the positive pole of the electric core to the side wall insulation test, the industrial computer controls all the first probe series, realizes all the positive pole series of electric core, applies 500VDC between the first probe and the side wall probe of series for 2 seconds, if the resistance is greater than 100MΩ, then the positive pole of the electric core to the side wall insulation test is qualified, otherwise, alarm, off-line maintenance;

[0041] Carry out the positive pole of the electric core to the side wall insulation test, the industrial computer controls all the first probe series, realizes all the positive pole series of electric core, applies 500VDC between the first probe and the side wall probe of series for 2 seconds, if the resistance is greater than 100MΩ, then the positive pole of the electric core to the side wall insulation test is qualified, otherwise, alarm, off-line maintenance.

[0042] Compared with the prior art, the beneficial effects of the present application are: the present application specifically relates to the insulation voltage resistance performance test of power battery module assembly, including inter-battery insulation test, positive pole of electric core to side wall insulation test, module positive pole to shell insulation test and voltage resistance test, the tooling of multiple probes realizes the contact of test points, the industrial computer controls the relay to control the on-off of test points, so as to realize different detection circuits, realize the automatic and rapid test of insulation voltage resistance performance of power battery module assembly, reduce the test cost, improve the test efficiency, and be suitable for batch detection. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a battery module safety testing device structure schematic view in the embodiment of the present application;

[0044] Figure 2 It is a battery module safety testing device structure front view in the embodiment of the present application;

[0045] Figure 3 It is a battery module safety testing device structure side view in the embodiment of the present application;

[0046] Figure 4 It is an A part structure enlarged schematic view of Figure 1 in the embodiment of the present application;

[0047] Figure 5 It is a battery module tray and battery module to be tested structure schematic view in the embodiment of the present application;

[0048] Figure 6 It is a B part structure enlarged schematic view of Figure 5 in the embodiment of the present application;

[0049] Figure 7 It is a battery module safety testing device structure connection schematic view in the embodiment of the present application;

[0050] Figure 8 It is a battery module safety testing method flow chart in the embodiment of the present application;

[0051] In the diagram: 100, First probe mechanism; 200, Second probe mechanism; 300, Battery module under test; 400, Battery module tray; 500, Industrial computer; 600, Top plate; 700, Support leg; 800, Limiting mechanism; 110, First probe; 120, First cylinder; 130, First mounting plate; 140, First probe holder; 210, Side wall probe; 220, Outer shell probe; 230, Second cylinder; 240, Second mounting plate; 250, Second probe holder; 310, Battery cell; 320, Side wall; 330, Housing; 810, First flange; 820, Second flange; 830, Impact block; 840, Limit post; 850, Mounting block; 860, Limit switch; 870, Stop block; 121, First cylinder body; 122, First piston rod; 131, Side wall; 231, Second cylinder body; 232, Second piston rod; 233, Second cylinder seat; 311, Positive electrode of battery cell; 312, Negative electrode of battery cell; 1211, First cylinder seat. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] Please refer to the accompanying drawings in the specification. This invention provides a technical solution: such as...Figures 1 to 5 As shown, a battery module safety testing device includes a first probe mechanism 100, a second probe mechanism 200, a battery module under test 300, a battery module tray 400, and an industrial control computer 500. The first probe mechanism 100 is provided with multiple sets of first probes 110; the second probe mechanism 200 is provided with sidewall probes 210 and shell probes 220; the battery module under test includes multiple cells 310, cell positive terminals, sidewalls 320, and shells 330, each cell 310 having a cell positive terminal 311 connected to its corresponding cell positive terminal; the battery module under test 300 is loaded on the battery module tray 400. The upper surface of 0; the industrial control computer 500 is used to control the electrical connection or disconnection between multiple sets of the first probes 110, and to apply a test voltage between the electrically disconnected first probes 110, to apply a test voltage between the electrically disconnected first probes 110 and the sidewall probes 210, and to apply a test voltage between the electrically disconnected first probes 110 and the housing probes 220; each of the multiple positive electrodes 311 of the battery cells is correspondingly arranged with a set of the first probes 110, the sidewall 320 is correspondingly arranged with the sidewall probes 210, and the housing 330 is correspondingly arranged with the housing probes 220; in the first direction the first The probe mechanism 100 has a first working position close to the battery module 300 under test, and a first separation position separate from the battery module 300 under test. When the first probe mechanism 100 is in the first working position, the first probe 110 is electrically connected to its corresponding positive electrode 311 of the battery cell. The industrial control computer 500 performs a withstand voltage test or an insulation test between the corresponding positive electrodes 311 of the battery cell by applying a test voltage between the electrically disconnected first probes 110. When the first probe 110 is in the first working position, the second probe mechanism 200 is in a second direction with respect to the battery module 300 under test. The battery modules 300 are in a second working position close to each other, and a second separation position separated from the battery module 300 under test. When the second probe mechanism 200 is in the second working position, the sidewall probe 210 is electrically connected to the sidewall 320, and the outer casing probe 220 is electrically connected to the outer casing 330. The industrial control computer 500 controls all the first probes 110 to be connected in series. The second probe mechanism 200 can perform insulation tests between the positive terminal of the battery cell and the sidewall 320, and insulation tests between the positive terminal of the battery cell and the outer casing 330 on the battery module 300 under test. The first direction and the second direction are perpendicular to each other.

[0056] In the above embodiments, the battery module 300 under test is positioned by the battery positioning mechanism 410 when it is installed on the battery module tray 400.

[0057] Optionally, it also includes a top plate 600 and a support leg 700, the top plate 600 and the support leg 700 being connected;

[0058] The first probe mechanism 100 further includes a first cylinder 120 and a first mounting plate 130. The first cylinder 120 includes a first cylinder body 121 and a first piston rod 122. The first mounting plate 130 is connected to the end of the first piston rod 122, and a plurality of first probes 110 are connected to the first mounting plate 130. The second probe mechanism 200 further includes a second cylinder 230 and a second mounting plate 240. The second cylinder 230 includes a second cylinder body 231 and a second piston rod 232. The second cylinder body 231 is connected to the first mounting plate 130. The second mounting plate 240 is connected to the end of the second piston rod 232. The side wall probe 210 and the outer shell probe 220 are respectively connected to the second mounting plate 240. The industrial control computer 500 controls the first cylinder 120 to place the first probe mechanism 100 in the first working position or the first disengaged position, and the industrial control computer 500 controls the second cylinder 230 to place the second probe mechanism 200 in the second working position or the second disengaged position.

[0059] In the above embodiments, the industrial control computer 500 controls the extension and retraction of the first piston rod 122 via a relay. When the first piston rod 122 extends and drives the first probe 110 to contact the positive electrode 311 of the battery cell, it reaches the first working position and the first piston rod 122 stops moving. The industrial control computer 500 controls the extension and retraction of the second piston rod 232 via a relay. When the second piston rod 232 extends and drives the side wall probe 210 and the outer shell probe 220 to contact the side wall and the outer shell respectively, it reaches the second working position and the second piston rod 232 stops moving.

[0060] Optionally, it also includes a limiting mechanism 800, which includes a first flange 810, a second flange 820, a stop block 830, a limiting post 840, a mounting block 850, a limit switch 860, and a stop block 870; the top plate 600 has a clearance hole, the first flange 810 is connected to the top plate 600, and the center hole of the first flange 810 is concentric with the clearance hole; the second flange 820 is connected to the upper surface of the first mounting plate 130; the stop block 830 is connected to the second flange 820, and the stop block 830 has a stop hole, which is concentric with the center hole of the first flange 810; the limiting post 840 is connected to the second flange 820 and passes through the clearance hole, the center hole of the first flange 810, and the stop hole, and can be positioned within the second flange 820. The first probe mechanism 100 slides within the central hole; the mounting block 850 is fixedly mounted on the top of the limiting post 840; the limiting switch 860 is mounted on the mounting block 850, and when the first piston rod 122 moves downward, the limiting switch 860 moves downward with the limiting post 840; when the limiting switch 860 touches the impact block 830, the first piston rod 122 stops moving downward; the stop block 870 is mounted on the mounting block 850, and when the stop block 870 moves downward with the limiting post 840 and abuts against the impact block 830, the first mounting plate 130 stops moving downward, thereby placing the first probe mechanism 100 in the first working position; the limiting mechanism 800 is used to limit the first working position and the first separation position, and to restrict the first probe mechanism 100 from moving in the first direction.

[0061] In the above embodiment, the industrial control computer 500 controls the retraction of the first piston rod 122 via a relay. When the first piston rod 122 retracts, it drives the first probe mechanism 100 to move, causing the limit switch 860 to touch the impact block 830. At this point, the first piston rod 122 stops retracting, and the first probe mechanism 100 is located in the first separation position. The industrial control computer 500 controls the retraction of the second piston rod 232 via a relay. When the second piston rod 232 retracts, it drives the side wall probe 210 and the outer shell probe 220 to separate from the side wall and the outer shell, respectively. When the second piston rod 232 is fully retracted, it reaches the second separation position and stops moving.

[0062] Optionally, the top plate 600 is provided with a clearance hole for the first piston rod 122, the first cylinder body 121 is provided with a first cylinder seat 1211, the first cylinder seat 1211 is connected to the top plate 600, and the first piston rod 122 passes through the clearance hole of the first piston rod 122.

[0063] Optionally, the first mounting plate 130 has a side wall 131, and the second cylinder 230 includes a second cylinder seat 233, which is connected to the side wall 131.

[0064] Optionally, the first probe mechanism 100 further includes a first probe base 140, which is connected to the first mounting plate 130. One end of the first probe 110 is connected to the first probe base 140. When the first probe mechanism 100 is in the first working position, the other end of the first probe 110 abuts against the corresponding positive electrode 311 of the battery cell.

[0065] Optionally, the above embodiments further include a third probe holder 170 and a third probe 160. The third probe holder 170 is connected to the first mounting plate 130, and the third probe holder 170 is connected to the third probe 160. In the first working position, the third probe 160 is connected to the negative electrode 312 of the battery cell. The industrial control computer can control the on / off combination of the third probe 160 to perform withstand voltage and insulation tests between the negative electrodes of the battery cell, as well as insulation tests between the negative electrode post of the battery cell and the side wall and the outer shell of the battery module under test.

[0066] Optionally, the second probe mechanism 200 includes a second probe base 250, which is connected to the second mounting plate 240. One end of the sidewall probe 210 and one end of the outer shell probe 220 are respectively connected to the second probe base 250. When the second probe mechanism 200 is in the second working position, the other end of the sidewall probe 210 abuts against the sidewall 320, and the other end of the outer shell probe 220 abuts against the outer shell 330.

[0067] Optionally, when the first probe mechanism 100 is in the first working position and the second probe mechanism 200 is in the second separated position, the industrial control computer 500 controls the odd number of the first probes 110 to be connected in series and controls the even number of the first probes 110 to be connected in series. The industrial control computer 500 applies a test voltage between the odd number of the first probes 110 and the even number of the first probes 110 to test the resistance between the odd number of the first probes 110 and the even number of the first probes 110 to detect whether the positive electrode 311 of the battery cell is withstand voltage and whether it is insulated.

[0068] In the above embodiments, the multiple cells of the battery module under test are arranged continuously. For example, the cells 310 are arranged in the following order: cell 1, cell 2, cell 3, cell 4... cell n-1, cell n. The first probes 110 are arranged in the following order: first probe 1, first probe 2, first probe 3, first probe 4... first probe n-1, first probe n, where n is an even number. The positive electrode 311 of cell n is correspondingly set with the first probe 110. When in the first working position, the industrial control computer 500 controls the relay to electrically connect the odd number of first probes 110 and the even number of first probes 110, that is, to electrically connect the first probes 1, 3... first probe n-1, and to electrically connect the first probes 2, 4... first probe n. By testing the resistance between the even number of first probes 110 and the odd number of first probes 110, the withstand voltage and insulation between the positive electrodes 311 of the cells are detected. The same method can also be used to test whether the withstand voltage and insulation between the negative electrodes 312 of the cells are tested.

[0069] Optionally, when the first probe mechanism 100 is in the first working position and the second probe mechanism 200 is in the second working position, the industrial control computer 500 controls all the first probes 110 to be connected in series. The industrial control computer 500 applies a test voltage between the connected first probes 110 and the sidewall probes 210 to detect the resistance between the positive terminal of the battery cell and the sidewall probes 210 to test whether the positive terminal of the battery cell is insulated from the sidewall 320. The industrial control computer 500 applies a test voltage between the connected first probes 110 and the outer casing probes 220 to detect the resistance between the positive terminal of the battery cell and the outer casing probes 220 to test whether the positive terminal of the battery cell is insulated from the outer casing 330.

[0070] On the other hand, a battery module safety testing method is provided, including the following steps:

[0071] S110, The battery module tray transports the battery module to the area below the first mounting plate, and the battery module tray is lifted and positioned.

[0072] S120, The first cylinder drives the first probe mechanism to move to the first working position, so that multiple sets of first probes respectively contact their corresponding positive terminals of the battery cells to complete the electrical connection;

[0073] S130, the second cylinder drives the second probe mechanism to move to the second working position, so that the side wall probe and the outer shell probe abut against the side wall and the outer shell respectively, and complete the electrical connection;

[0074] S140. Perform a cell-to-cell withstand voltage test. The industrial control computer controls the odd-numbered first probe and the even-numbered first probe to be connected in series, so as to realize the series connection of the positive terminals of the odd-numbered cells and the even-numbered cells. Apply 2700VDC between the odd-numbered first probe and the even-numbered first probe for 2 seconds. If the resistance is greater than 500MΩ, the cell-to-cell withstand voltage test is qualified.

[0075] S150. Perform cell-to-cell insulation test. The industrial control computer controls the odd-numbered first probe and the even-numbered first probe to be connected in series, so as to realize the positive terminals of the odd-numbered cells and the even-numbered cells are connected in series. Apply 500VDC to the odd-numbered first probe and the even-numbered first probe for 2 seconds. If the resistance is greater than 100MΩ, the cell-to-cell insulation test is qualified; otherwise, an alarm is triggered and the cell is taken offline for maintenance.

[0076] S160. Perform insulation test of the positive terminal of the battery cell to the side wall. The industrial control computer controls all the first probes to be connected in series to realize the series connection of the positive terminals of all the battery cells. Apply 500VDC to the first probe and the side wall probe for 2 seconds. If the resistance is greater than 100MΩ, the insulation test of the positive terminal of the battery cell to the side wall is qualified. Otherwise, an alarm is triggered and the battery cell is taken offline for maintenance.

[0077] S170. When performing the insulation test of the positive terminal of the battery cell to the casing, the industrial control computer controls all the first probes to be connected in series, so that all the positive terminals of the battery cells are connected in series. Apply 500VDC for 2 seconds between the first probes connected in series and the casing probes. If the resistance is greater than 500MΩ, the insulation test of the positive terminal of the battery cell to the side wall is qualified; otherwise, an alarm is triggered and the battery is taken offline for maintenance.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery module safety testing device, characterized in that, include: A first probe mechanism 100 is provided, wherein the first probe mechanism 100 is provided with multiple sets of first probes 110; The second probe mechanism 200 is provided with a sidewall probe 210 and a housing probe 220. The battery module under test 300 includes multiple battery cells 310, a positive terminal post of the battery cell, a sidewall 320 and a housing 330. Each battery cell 310 has a positive terminal 311, which is connected to its corresponding positive terminal post. Battery module tray 400, wherein the battery module 300 to be tested is mounted on the upper surface of the battery module tray 400; An industrial computer 500 is used to control the electrical connection or disconnection between multiple sets of the first probes 110, and to apply a test voltage between the electrically disconnected first probes 110, to apply a test voltage between the electrically disconnected first probes 110 and the side wall probe 210, and to apply a test voltage between the electrically disconnected first probes 110 and the housing probe 220. Each of the plurality of positive electrode 311 of the battery cells is correspondingly disposed with a set of the first probes 110, the sidewall 320 is correspondingly disposed with the sidewall probes 210, and the outer shell 330 is correspondingly disposed with the outer shell probes 220. In a first direction, the first probe mechanism 100 has a first working position close to the battery module 300 under test and a first separation position separate from the battery module 300 under test. When the first probe mechanism 100 is in the first working position, the first probe 110 is electrically connected to its corresponding positive electrode 311 of the battery cell. When the first probe 110 is in the first working position, in a second direction, the second probe mechanism 200 has a second working position close to the battery module 300 under test and a second separation position separate from the battery module 300 under test. When the second probe mechanism 200 is in the second working position, the sidewall probes 210 are electrically connected to the sidewall 320, and the outer shell probes 220 are electrically connected to the outer shell 330. The first direction and the second direction are perpendicular to each other.

2. The battery module safety testing device according to claim 1, characterized in that, It also includes a top plate 600 and a support leg 700, which are connected; The first probe mechanism 100 further includes: The first cylinder 120 includes a first cylinder body 121 and a first piston rod 122; A first mounting plate 130 is connected to the end of the first piston rod 122, and a plurality of first probes 110 are connected to the first mounting plate 130. The second probe mechanism 200 further includes: The second cylinder 230 includes a second cylinder body 231 and a second piston rod 232, and the second cylinder body 231 is connected to the first mounting plate 130. The second mounting plate 240 is connected to the end of the second piston rod 232, and the side wall probe 210 and the outer shell probe 220 are respectively connected to the second mounting plate 240; The industrial control computer 500 controls the first cylinder 120 to place the first probe mechanism 100 in the first working position or the first separation position, and the industrial control computer 500 controls the second cylinder 230 to place the second probe mechanism 200 in the second working position or the second separation position.

3. The battery module safety testing device according to claim 2, characterized in that, It also includes a limiting mechanism 800, which includes: The first flange 810 is connected to the top plate 600, and the center hole of the first flange 810 is concentric with the clearance hole. The second flange 820 is connected to the upper surface of the first mounting plate 130; A striking block 830 is connected to the second flange 820. The striking block 830 is provided with a striking block hole, which is concentric with the center hole of the first flange 810. The limiting post 840 is connected to the second flange 820 and passes through the clearance hole, the center hole of the first flange 810 and the impact block hole, and can slide within the center hole of the second flange 820; Mounting block 850, which is fixedly mounted on the top of the limiting post 840; Limit switch 860 is mounted on mounting block 850. When the first piston rod 122 moves downward, the limit switch 860 moves downward with the limit post 840. When the limit switch 860 touches the stop block 830, the first piston rod 122 stops moving downward. A stop block 870 is mounted on the mounting block 850. When the stop block 870 moves downward with the limiting post 840 and abuts against the impact block 830, the first mounting plate 130 stops moving downward, thereby placing the first probe mechanism 100 in the first working position. The limiting mechanism 800 is used to limit the first working position and the first separation position, and to restrict the movement of the first probe mechanism 100 in the first direction.

4. The battery module safety testing device according to claim 2, characterized in that, The top plate 600 is provided with a clearance hole for the first piston rod 122, and the first cylinder body 121 is provided with a first cylinder seat 1211. The first cylinder seat 1211 is connected to the top plate 600, and the first piston rod 122 passes through the clearance hole of the first piston rod 122.

5. A battery module safety testing device according to claim 2, characterized in that, The first mounting plate 130 has a side wall 131. The second cylinder 230 includes a second cylinder seat 233, which is connected to the side wall 131.

6. The battery module safety testing device according to claim 2, characterized in that, The first probe mechanism 100 further includes a first probe base 140, which is connected to the first mounting plate 130. One end of the first probe 110 is connected to the first probe base 140. When the first probe mechanism 100 is in the first working position, the other end of the first probe 110 abuts against the corresponding positive electrode 311 of the battery cell.

7. The battery module safety testing device according to claim 6, characterized in that, The second probe mechanism 200 includes a second probe base 250, which is connected to the second mounting plate 240. One end of the side wall probe 210 and one end of the outer shell probe 220 are respectively connected to the second probe base 250. When the second probe mechanism 200 is in the second working position, the other end of the side wall probe 210 abuts against the side wall 320, and the other end of the outer shell probe 220 abuts against the outer shell 330.

8. The battery module safety testing device according to claim 7, characterized in that, When the first probe mechanism 100 is in the first working position and the second probe mechanism 200 is in the second separation position, the industrial control computer 500 controls the odd number of the first probes 110 to be connected in series and controls the even number of the first probes 110 to be connected in series. The industrial control computer 500 applies a test voltage between the odd number of the first probes 110 and the even number of the first probes 110 and tests the resistance between the odd number of the first probes 110 and the even number of the first probes 110 to detect whether the positive electrode 311 of the battery cell is insulated.

9. A battery module safety testing device according to claim 7, characterized in that, When the first probe mechanism 100 is in the first working position and the second probe mechanism 200 is in the second working position, the industrial control computer 500 controls all the first probes 110 to be connected in series. The industrial control computer 500 applies a test voltage between the connected first probes 110 and the sidewall probes 210 to detect the resistance between the positive terminal of the battery cell and the sidewall probes 210 to test whether the positive terminal of the battery cell is insulated from the sidewall 320. The industrial control computer 500 applies a test voltage between the connected first probes 110 and the outer casing probes 220 to detect the resistance between the positive terminal of the battery cell and the outer casing probes 220 to test whether the positive terminal of the battery cell is insulated from the outer casing 330.

10. A safety testing method for a battery module, characterized in that, include: The battery module tray transports the battery module to the area below the first mounting plate, and then the battery module tray is lifted and positioned. The first cylinder drives the first probe mechanism to move to the first working position, so that multiple sets of first probes respectively come into contact with the positive terminal of their corresponding battery cells to complete the electrical connection. The second cylinder drives the second probe mechanism to the second working position, so that the side wall probe and the outer shell probe abut against the side wall and the outer shell respectively, and complete the electrical connection. To conduct a withstand voltage test between battery cells, the industrial control computer controls the odd-numbered first probe and the even-numbered first probe to be connected in series, so as to realize the series connection of the positive terminals of the odd-numbered battery cells and the even-numbered battery cells. Apply 2700VDC between the odd-numbered first probe and the even-numbered first probe for 2 seconds. If the resistance is greater than 500MΩ, the withstand voltage test between battery cells is qualified. To perform cell-to-cell insulation testing, the industrial control computer controls the odd-numbered first probe and the even-numbered first probe to be connected in series, thus achieving series connection of the positive terminals of the odd-numbered cells and the even-numbered cells. Apply 500VDC to the odd-numbered first probe and the even-numbered first probe for 2 seconds. If the resistance value is greater than 100MΩ, it means that the cell-to-cell insulation test is qualified; otherwise, an alarm is triggered and the cells are taken offline for maintenance. To perform an insulation test on the positive terminal of the battery cell to the sidewall, the industrial control computer controls all the first probes to be connected in series, so that all the positive terminals of the battery cells are connected in series. A 500VDC is applied between the first probe and the sidewall probe for 2 seconds. If the resistance is greater than 100MΩ, the insulation test on the positive terminal of the battery cell to the sidewall is qualified; otherwise, an alarm is triggered and the battery cell is taken offline for maintenance. When performing insulation tests on the positive terminal of the battery cell to the casing, the industrial control computer controls all the first probes to be connected in series, so that all the positive terminals of the battery cells are connected in series. A 500VDC is applied between the first probes connected in series and the casing probe for 2 seconds. If the resistance is greater than 500MΩ, the insulation test of the positive terminal of the battery cell to the side wall is qualified; otherwise, an alarm is triggered and the battery is taken offline for maintenance.

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