Battery grouping performance detection device

By using the design of the plug-in mechanism and anti-corrosion protective layer in the battery assembly performance detection device, the corrosion problem caused by the acidic environment of the existing equipment is solved, extending the service life of the equipment and simplifying the maintenance process.

CN119471454AInactive Publication Date: 2025-02-18SUZHOU MAIDAO ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411405368.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-10
Publication Date
2025-02-18
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing battery pack detection equipment is in an acidic environment for a long time, which causes internal cables and accessories to corrode, reducing the service life of the equipment.

Method used

A battery pack performance detection device is designed, using a plug-in and unplugged connection between the relay circuit board. The relay detection mechanism is coated with an anti-corrosion protection layer, which only exposes the removable cables to avoid large-area cables. Exposed to acidic environment.

Benefits of technology

It effectively avoids corrosion of cables and accessories, extends the service life of the inspection equipment, and simplifies the process of replacement and repair after damage.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of battery detection, and discloses a battery grouping performance detection device, which comprises a relay detection mechanism arranged at the top of a frame body; a plurality of groups of batteries are arranged on the frame body, the plurality of groups of batteries are all positioned below the relay detection mechanism, each group of batteries is provided with a detection line, and the top of each detection line is inserted into the relay detection mechanism; the interior of the relay detection mechanism is coated with an anti-corrosion protection layer, a relay circuit board is installed in the relay detection mechanism, and the surface, close to the edge, of the relay circuit board is provided with multiple sets of interfaces. The battery matching performance detection device solves the problems that in the prior art, in the space where a battery matching group is located, the environment is acidic due to the existence of batteries, detection equipment works in the acidic environment for a long time, cables and accessories integrally connected in the detection equipment are corroded, and the service life of the detection equipment is shortened.
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Description

Technical Field

[0001] The invention relates to the technical field of battery detection, in particular to a battery assembly performance detection device. Background Art

[0002] A battery pack is a battery group formed by connecting multiple batteries together to achieve a state of normal use. Its core lies in improving the overall performance of the battery pack, extending its service life, and enhancing safety through steps such as screening, pairing, and combination. This technology plays a vital role in the stability and safety of lead-acid batteries in various application fields.

[0003] The purpose of battery matching is to ensure the consistency of the performance of each cell in a group of batteries. In the process of in-depth research on battery matching, a set of data acquisition equipment that can accurately measure various battery parameters is an indispensable part.

[0004] By connecting the detection equipment, it can be ensured that each battery group can perform at its best performance, which not only improves the efficiency of the matching work, but also ensures the stability and reliability of the battery pack in actual use. However, in the prior art, the space where the battery is matched will cause the environment to become acidic due to the presence of the batteries, and the detection equipment will work in an acidic environment for a long time, which will cause the cables and accessories connected inside to be corroded, thereby reducing the service life of the detection equipment. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a battery pack performance detection device to solve the problems mentioned in the above background.

[0006] The present invention provides the following technical solution: a battery pack performance detection device, comprising: a relay detection mechanism arranged on the top of a frame; A plurality of groups of batteries are arranged on the frame, and the plurality of groups of batteries are all located below the relay detection mechanism, and a detection line is provided on each group of batteries, and the top of the detection line is plugged into the relay detection mechanism; The interior of the relay detection mechanism is coated with an anti-corrosion protective layer, a relay circuit board is installed in the relay detection mechanism, a plurality of groups of interfaces are arranged on the surface of the relay circuit board close to the edge, and a plug-in mechanism is arranged on each group of interfaces of the relay circuit board for plugging and unplugging, the end of the plug-in mechanism away from the relay circuit board passes through the relay detection mechanism and is connected to the top of the detection line, and supporting feet are installed at the four corners of the bottom of the relay detection mechanism.

[0007] Preferably, the frame is made of a frame structure as a whole, the top of the frame protrudes to form four pillars, two of the pillars located on the front and rear axes are longitudinally installed with slide rails, and the relay detection mechanism is slidably arranged with the pillars on the top of the frame through the slide rails.

[0008] Preferably, the support leg includes a support block, and the two support blocks located in front of the relay detection mechanism are both provided with an accommodating cavity, a pin rod is slidably arranged inside the accommodating cavity, both ends of the pin rod pass through the support block, a retaining ring is sleeved on the surface of the pin rod located inside the accommodating cavity, a compression spring is arranged on one side of the retaining ring, and the compression spring is sleeved on the pin rod.

[0009] Preferably, the support leg also includes a socket mounted on the frame, the socket is provided with a socket hole, one end of the pin rod is inserted into the socket hole, a handle is integrally provided on the surface of the pin rod close to the other end, a groove is provided on the side of the support block, and the handle is slidably arranged in the groove.

[0010] Preferably, the bottom of the relay circuit board is filled with silicone grease and is in contact with a heat sink, the bottom of the heat sink is integrally formed with a plurality of fins, and the plurality of fins all penetrate the bottom of the relay detection mechanism, and the gap between the heat sink and the relay detection mechanism is filled with sealant.

[0011] Preferably, the relay detection mechanism includes a casing, and a plurality of groups of symmetrically arranged first connecting slots are provided on the front and rear sides of the casing, and each group of the first connecting slots is plugged into the plug-in mechanism. A second connecting slot is provided at the front end of the casing near the corner, and the interior of the second connecting slot is connected to the intelligent matching system equipment through a plug-in cable.

[0012] Preferably, the relay detection mechanism also includes a mounting seat, which is integrally arranged in the casing, and a plurality of groups of positioning grooves are provided on the side of the mounting seat, and the positions of the plurality of groups of positioning grooves respectively correspond to the positions of the first connecting groove and the casing, and the structure on the plug-in mechanism is plugged into the inner wall of the positioning groove, and a top cover is sealedly installed on the top of the casing.

[0013] Preferably, the plug-in mechanism includes a connecting head, a collection line is arranged on the top of the connecting head, a plug is installed on the end of the collection line away from the connecting head, a plurality of groups of sockets are integrally connected to the relay circuit board, the plug is plugged into one of the sockets, a positioning block is arranged on the side of the connecting head, and the positioning block is mounted to the internal structure of the relay detection mechanism by bolts.

[0014] Preferably, the connecting head includes a disassembly block, one side of the disassembly block is integrally provided with a socket, the other side of the disassembly block is provided with an embedding groove, the socket passes through the relay detection mechanism and is plugged into the detection line, the inner wall of the embedding groove is formed with a slope, and the structure of the positioning block close to the side of the disassembly block is adapted to the structure of the inner wall of the embedding groove and overlapped with it.

[0015] Preferably, the detection line includes two clamping handles connected by a tail handle spring, the bottom of the clamping handle is integrally provided with a contact piece, the contact pieces at the bottom of the two clamping handles are pinched together to form a hollow component, a probe is provided inside the hollow component, a collection cable made of a spring telescopic wire is provided on the top of the probe, a connector is installed at the end of the collection cable away from the probe, the connector is plugged into the relay detection mechanism, the needle tube of the probe is fixed in one of the contact pieces by using insulating glue, and one of the clamping handles is connected in series with an adjacent detection line by providing a group connection line, the electrode on the battery is concave to form a pole hole, and the hollow component formed by the pinching of the contact pieces carries the probe and is plugged into the pole hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The battery pack performance detection device abandons the traditional wiring idea, uses a plug-in mechanism to connect with the relay circuit board, and uses the plug-in mechanism as an external interface to connect with the detection line, so that the instrument and the battery are completely changed to a point-to-point cable connection mode, and the plug-in mechanism is used to seal the opening on the relay detection mechanism, so that the accessories are installed in the anti-corrosion sealed relay detection mechanism, and only the detachable and replaceable cables are exposed to the outside, thereby avoiding the situation where large-area integrated connected cables and accessories are exposed to the acidic environment, and the damaged cables can be replaced in a targeted manner, which has the effect of increasing the service life of the detection equipment.

[0017] 2. The battery pack performance detection device is provided with a plug-in mechanism, and the plug-in mechanism and the relay detection mechanism are detachably connected. After the plug-in mechanism is used to block the hole opened on the relay detection mechanism, even if the interface of the plug-in mechanism is exposed to the outside due to the hole, the plug-in mechanism can be replaced after damage, so that the detection device can be quickly put into use again after simple maintenance and replacement of accessories, reducing the impact of accessory damage on the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional top view of the structure of the relay detection mechanism of the present invention; Figure 3 It is a schematic diagram of the cross-section structure of the relay detection mechanism of the present invention when viewed from above; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the side section structure of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle; Figure 7This is a schematic diagram of the internal disassembled structure of the relay detection mechanism of the present invention; Figure 8 It is a schematic diagram of the structure of the relay detection mechanism of the present invention; Fig. 9 It is a schematic diagram of the connection structure between the relay circuit board and the plug-in mechanism of the present invention; Fig.10 This is a schematic diagram of the disassembled structure of the insertion mechanism of the present invention; Fig.11 It is a schematic diagram of the detection line structure of the present invention; Fig.12 This is a schematic diagram of the connection structure between the detection line and the battery of the present invention.

[0019] In the figure: 1, frame; 2, battery; 3, relay detection mechanism; 31, housing; 32, first connection slot; 33, second connection slot; 34, mounting seat; 35, top cover; 36, positioning slot; 4, slide rail; 5, support foot; 51, support block; 52, accommodating cavity; 53, pin rod; 54, retaining ring; 55, compression spring; 56, card seat; 57, card hole; 58, strip groove; 59, dial handle; 6, detection line ; 61. Clamp handle; 62. Contact piece; 63. Group connection line; 64. Collection cable; 65. Connector; 66. Probe; 7. Relay circuit board; 8. Insertion mechanism; 81. Connector; 811. Disassembly block; 812. Embedding groove; 813. Socket; 82. Collection line; 83. Plug; 84. Positioning block; 9. Heat sink; 10. Fin; 11. Socket; 12. Bolt; 13. Pole hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-12 , a battery pack performance detection device, comprising: a relay detection mechanism 3 arranged on the top of a frame 1; A plurality of battery groups 2 are arranged on the frame 1, and the plurality of battery groups 2 are all located below the relay detection mechanism 3, and a detection line 6 is provided on each battery group 2, and the top of the detection line 6 is plugged into the relay detection mechanism 3; The interior of the relay detection mechanism 3 is coated with an anti-corrosion protective layer, and a relay circuit board 7 is installed in the relay detection mechanism 3. A plurality of groups of interfaces are arranged on the surface of the relay circuit board 7 near the edge, and a plug-in mechanism 8 is arranged on the interfaces of each group of the relay circuit board 7 for plugging and unplugging. The end of the plug-in mechanism 8 away from the relay circuit board 7 passes through the relay detection mechanism 3 and is connected to the top of the detection line 6. Support feet 5 are installed at the four corners of the bottom of the relay detection mechanism 3.

[0022] Among them; the frame body 1 is made of a frame structure as a whole, and four pillars are protruded from the top of the frame body 1. Slide rails 4 are longitudinally installed on the two pillars located on the front and rear axes. The relay detection mechanism 3 is slidably arranged with the pillars on the top of the frame body 1 through the slide rails 4. The relay detection mechanism 3 is set on the frame body 1 by using the slide rails 4, so that the relay detection mechanism 3 is easy to disassemble. After the accessories are damaged, they can be removed to a normal environment for maintenance, avoiding the acidic air in the assembly room from entering the relay detection mechanism 3.

[0023] Among them; the support leg 5 includes a support block 51, and the two support blocks 51 located in front of the relay detection mechanism 3 are both provided with a accommodating cavity 52, and a pin rod 53 is slidably arranged inside the accommodating cavity 52. ​​Both ends of the pin rod 53 pass through the support block 51, and a retaining ring 54 is sleeved on the surface of the pin rod 53 located inside the accommodating cavity 52. ​​A compression spring 55 is arranged on one side of the retaining ring 54, and the compression spring 55 is sleeved on the pin rod 53. By arranging the pin rod 53 in the support leg 5, after the relay detection mechanism 3 is set on the frame 1 using the slide rail 4, the pin rod 53 can quickly lock and fix the relay detection mechanism 3 to prevent the relay detection mechanism 3 from shaking.

[0024] Among them, the support leg 5 also includes a socket 56 installed on the frame 1, and a socket 56 is provided with a socket hole 57. One end of the pin rod 53 is inserted into the socket hole 57, and a handle 59 is integrally provided on the surface of the pin rod 53 near the other end. A groove 58 is provided on the side of the support block 51, and the handle 59 is slidably set in the groove 58. When the relay detection mechanism 3 needs to be removed, the handle 59 is pushed to slide along the groove 58 to disengage the pin rod 53 from the plug-in state, so that the relay detection mechanism 3 can be quickly removed from the frame 1.

[0025] Among them; the bottom of the relay circuit board 7 is filled with silicone grease and is in contact with the heat sink 9, and the bottom of the heat sink 9 is integrally formed with a plurality of fins 10, and the plurality of fins 10 all penetrate the bottom of the relay detection mechanism 3. The heat sink 9 and the relay detection mechanism 3 are filled with sealant. The heat sink 9 and the relay circuit board 7 are fully in contact by filling with silicone grease. When the relay circuit board 7 generates heat due to long-term work, the heat can be transferred to the heat sink 9, and then the heat is dissipated to the outside of the relay detection mechanism 3 by using the plurality of fins 10, thereby achieving the effect of heat dissipation in a sealed state.

[0026] Among them; the relay detection mechanism 3 includes a casing 31, and a plurality of groups of symmetrically arranged first connecting slots 32 are opened on the front and rear sides of the casing 31, and each group of first connecting slots 32 is plugged into the plug-in mechanism 8. A second connecting slot 33 is opened at the front end of the casing 31 near the corner, and the interior of the second connecting slot 33 is connected to the intelligent matching system equipment through a plug-in cable. By opening the first connecting slot 32 and the second connecting slot 33 on the relay detection mechanism 3, the external line can be connected to the relay circuit board 7 inside the relay detection mechanism 3 through the first connecting slot 32 and the second connecting slot 33.

[0027] Among them; the relay detection mechanism 3 also includes a mounting seat 34, the mounting seat 34 is integrally arranged in the casing 31, and a plurality of positioning grooves 36 are provided on the side of the mounting seat 34, and the positions of the plurality of positioning grooves 36 respectively correspond to the positions of the first connecting groove 32 and the casing 31, and the structure on the plug-in mechanism 8 is plugged into the inner wall of the positioning groove 36, and a top cover 35 is sealedly installed on the top of the casing 31. The positioning groove 36 is used to guide and position the plug-in mechanism 8 when it is installed, so that the plug-in mechanism 8 can be installed stably to avoid shaking after installation.

[0028] Among them; the plug-in mechanism 8 includes a connecting head 81, a collection line 82 is arranged on the top of the connecting head 81, a plug 83 is installed on the end of the collection line 82 away from the connecting head 81, a plurality of sockets 11 are integrally connected to the relay circuit board 7, the plug 83 is plugged into one of the sockets 11, a positioning block 84 is arranged on the side of the connecting head 81, and the positioning block 84 is installed with the internal structure of the relay detection mechanism 3 by setting bolts 12. The plug-in mechanism 8 is used as a mechanism for blocking the holes on the relay detection mechanism 3, and the holes on the relay detection mechanism 3 can be used to connect the external lines to the inside thereof. At the same time, when the plug-in mechanism 8 is corroded and damaged due to contact with the external air during the long-term blocking process, it can also be replaced.

[0029] Among them; the connecting head 81 includes a disassembly block 811, one side of the disassembly block 811 is integrally provided with a socket 813, the other side of the disassembly block 811 is provided with an embedding groove 812, the socket 813 passes through the relay detection mechanism 3 and is inserted into the detection line 6, the inner wall of the embedding groove 812 is formed with a slope, the structure of the positioning block 84 close to the side of the disassembly block 811 is adapted to the structure of the inner wall of the embedding groove 812 and overlapped with it, after the socket 813 is inserted into the hole on the relay detection mechanism 3, the positioning block 84 is pressed down to push the embedding groove 812 outward to ensure that the connecting head 81 is tightly connected to the relay detection mechanism 3.

[0030] Among them, the detection line 6 includes two clamping handles 61 connected by a tail handle spring, and a contact piece 62 is integrally arranged at the bottom of the clamping handle 61. The contact pieces 62 at the bottom of the two clamping handles 61 are pinched together to form a hollow component, and a probe 66 is arranged inside the hollow component. A collection cable 64 made of a spring telescopic line is arranged on the top of the probe 66. A connector 65 is installed at the end of the collection cable 64 away from the probe 66. The connector 65 is plugged into the relay detection mechanism 3, and the needle tube of the probe 66 is fixed in one of the contact pieces 62 with insulating glue. , and one of the clamping handles 61 is connected in series with the adjacent detection line 6 by providing a group connection line 63, the electrode on the battery 2 is concave to form a pole hole 13, and the hollow component formed by the contact piece 62 is kneaded to carry the probe 66 and inserted into the pole hole 13. The limited length of the collection cable 64 is stored above the frame 1 in the form of a spring telescopic line and plugged into the relay circuit board 7, so that the collection cable 64 and the probe 66 can be quickly replaced even if they are damaged, reducing the disadvantage of damage caused by the integrated line connection, that is, all replacement, thereby saving replacement costs.

[0031] Working principle: when testing the paired battery 2, firstly, the relay detection mechanism 3 is fixed on the frame 1 by using the slide rail 4 and the support leg 5, and after the battery 2 is paired, the detection data in the pole hole 13 is transmitted to the relay detection mechanism 3 separately by using the detection line 6, so as to achieve the effect of testing the paired battery 2; When the line is damaged due to air corrosion, a new set of detection lines 6 is directly taken to replace the damaged ones, and then plugged into the relay detection mechanism 3; When the part of the relay detection mechanism 3 that is connected to the detection line 6 is damaged, the relay detection mechanism 3 is removed from the frame 1, the relay detection mechanism 3 is disassembled in a normal environment, and then the insertion mechanism 8 is removed and replaced, and then the relay detection mechanism 3 is reinstalled and used again.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack performance detection device, characterized in that: include: A relay detection mechanism (3) disposed on the top of the frame (1); A plurality of groups of batteries (2) are arranged on the frame (1), the plurality of groups of batteries (2) are all located below the relay detection mechanism (3), and a detection line (6) is provided on each group of batteries (2), the top of the detection line (6) is plugged into the relay detection mechanism (3); The interior of the relay detection mechanism (3) is coated with an anti-corrosion protective layer. A relay circuit board (7) is installed in the relay detection mechanism (3). A plurality of groups of interfaces are arranged on the surface of the relay circuit board (7) near the edge. A plug-in mechanism (8) is provided on each group of interfaces of the relay circuit board (7). An end of the plug-in mechanism (8) away from the relay circuit board (7) passes through the relay detection mechanism (3) and is connected to the top of the detection line (6). Support feet (5) are installed at the four corners of the bottom of the relay detection mechanism (3).

2. A battery pack performance detection device according to claim 1, characterized in that: The frame (1) is made of a frame structure as a whole. The top of the frame (1) protrudes to form four pillars. Two of the pillars located on the front and rear axes are longitudinally mounted with slide rails (4). The relay detection mechanism (3) is slidably arranged with the pillars on the top of the frame (1) via the slide rails (4).

3. A battery pack performance detection device according to claim 1, characterized in that: The support foot (5) comprises a support block (51), and the two support blocks (51) located in front of the relay detection mechanism (3) are both provided with a receiving cavity (52), and a pin rod (53) is slidably arranged inside the receiving cavity (52), and both ends of the pin rod (53) pass through the support block (51), and a retaining ring (54) is sleeved on the surface of the pin rod (53) located inside the receiving cavity (52), and a compression spring (55) is arranged on one side of the retaining ring (54), and the compression spring (55) is sleeved on the pin rod (53).

4. A battery pack performance detection device according to claim 3, characterized in that: The support leg (5) further comprises a holder (56) mounted on the frame body (1), a holder (56) being provided with a holder hole (57), one end of the pin rod (53) being inserted into the holder hole (57), a handle (59) being integrally provided on a surface of the pin rod (53) close to the other end, a groove (58) being provided on a side surface of the support block (51), and the handle (59) being slidably disposed in the groove (58).

5. A battery pack performance detection device according to claim 1, characterized in that: The bottom of the relay circuit board (7) is filled with silicone grease and in contact with a heat sink (9), the bottom of the heat sink (9) is integrally formed with a plurality of fins (10), the plurality of fins (10) all penetrate the bottom of the relay detection mechanism (3), and a sealant is used to fill the gap between the heat sink (9) and the relay detection mechanism (3).

6. A battery pack performance detection device according to claim 1, characterized in that: The relay detection mechanism (3) comprises a housing (31), and a plurality of groups of symmetrically arranged first connection slots (32) are provided on the front and rear sides of the housing (31), and each group of the first connection slots (32) is plugged into the plug-in mechanism (8). A second connection slot (33) is provided at the front end of the housing (31) near the corner, and the interior of the second connection slot (33) is connected to the intelligent matching system device via a plug-in cable.

7. A battery pack performance detection device according to claim 6, characterized in that: The relay detection mechanism (3) further comprises a mounting seat (34), the mounting seat (34) being integrally arranged in the housing (31), a plurality of groups of positioning grooves (36) being provided on the side surface of the mounting seat (34), the positions of the plurality of groups of positioning grooves (36) respectively corresponding to the positions of the first connection groove (32) and the housing (31), the structure on the plug-in mechanism (8) being plugged into the inner wall of the positioning groove (36), and a top cover (35) being sealedly mounted on the top of the housing (31).

8. A battery pack performance detection device according to claim 1, characterized in that: The plug-in mechanism (8) comprises a connection head (81), a collection line (82) is arranged on the top of the connection head (81), a plug (83) is installed at one end of the collection line (82) away from the connection head (81), a plurality of groups of sockets (11) are integrally connected to the relay circuit board (7), the plug (83) is plugged into one of the sockets (11), a positioning block (84) is arranged on the side of the connection head (81), and the positioning block (84) is installed with the internal structure of the relay detection mechanism (3) by means of bolts (12).

9. A battery pack performance detection device according to claim 8, characterized in that: The connecting head (81) comprises a disassembly block (811), one side of the disassembly block (811) is integrally provided with a socket (813), the other side of the disassembly block (811) is provided with an embedding groove (812), the socket (813) passes through the relay detection mechanism (3) and is plugged into the detection line (6), the inner wall of the embedding groove (812) is formed with a slope, and the structure of the positioning block (84) close to the side of the disassembly block (811) is adapted to the structure of the inner wall of the embedding groove (812) and overlaps with it.

10. A battery pack performance detection device according to claim 1, characterized in that: The detection line (6) comprises two clamping handles (61) connected by a tail handle spring, the bottom of the clamping handle (61) is integrally provided with a contact piece (62), the contact pieces (62) at the bottom of the two clamping handles (61) are pinched together to form a hollow member, a probe (66) is arranged inside the hollow member, a collection cable (64) made of a spring telescopic wire is arranged on the top of the probe (66), a connector (65) is installed at one end of the collection cable (64) away from the probe (66), the connector (65) is plugged into the relay detection mechanism (3), the needle tube of the probe (66) is fixedly arranged in one of the contact pieces (62) by using insulating glue, and one of the clamping handles (61) is connected in series with the adjacent detection line (6) by being provided with a group connection line (63), the electrode on the battery (2) is concave to form a pole hole (13), and the hollow member formed by pinching the contact pieces (62) carries the probe (66) and is plugged into the pole hole (13).