Battery external short circuit test device and battery external short circuit test equipment

Abstract

The utility model relates to the technical field of battery testing devices, in particular to a battery external short circuit testing device and battery external short circuit testing equipment. The battery external short circuit test device comprises wire assemblies and a switch, the two wire assemblies are used for being connected with a positive tab and a negative tab of a battery respectively, the switch is connected between the two wire assemblies and used for controlling connection and disconnection of the two wire assemblies, each wire assembly comprises a wire, a clamping piece and an adjusting piece, and the first end of each wire is electrically connected with the corresponding switch; the second end of the wire is electrically connected with the clamping piece, the clamping piece comprises a clamping part, the clamping part is provided with a conductive surface, the conductive surface is used for being attached to the tab of the battery, and the adjusting piece is used for applying clamping force to the clamping part so that the clamping part can clamp the tab of the battery. The contact area of the conductive surface and the tab is large, and the adjusting piece can apply a clamping force to make the conductive surface and the tab more fully contacted, so that the resistance value at the contact part is small, and the conditions of tab fusing and battery fire are not easy to occur.

Description

Technical Field

[0001] This application relates to the technical field of battery testing devices, and particularly relates to a battery external short - circuit test device and a battery external short - circuit test equipment. Background Art

[0002] The battery external short - circuit test is a test that simulates the external short - circuit situation of the battery. The external short - circuit test process of explosion - proof lithium batteries is generally carried out in an explosion - proof box. The explosion - proof box can provide the high - temperature working conditions required for the test. During the test, the staff uses wires to connect the positive electrode tab and the negative electrode tab of the battery to form an external short - circuit. Since the current is large when the battery has an external short - circuit, and the wires are generally connected to the positive electrode tab and the negative electrode tab of the battery through alligator clips, problems such as electrode tab fusing and even battery fire are likely to occur. Utility Model Content

[0003] This application mainly solves the problem that during the battery external short - circuit test process, the battery is prone to electrode tab fusing and even catching fire.

[0004] According to one aspect of this application, in one embodiment, a battery external short - circuit test device is provided, including a wire assembly and a switch. There are two groups of the wire assemblies. The two groups of wire assemblies are respectively used to connect the positive electrode tab and the negative electrode tab of the battery. The switch is connected between the two groups of wire assemblies and is used to control the conduction and disconnection of the two groups of wire assemblies.

[0005] The wire assembly includes a wire, a clamping member, and an adjusting member. The first end of the wire is electrically connected to the switch, and the second end of the wire is electrically connected to the clamping member. The clamping member includes a clamping portion. The clamping portion has a conductive surface, and the conductive surface is used to fit with the electrode tab of the battery. The adjusting member is used to apply a clamping force to the clamping portion so that the clamping portion clamps the electrode tab of the battery.

[0006] In some embodiments, the clamping portion includes a first clip and a second clip arranged opposite to each other. The opposite surfaces of the first clip and the second clip form the conductive surface.

[0007] In some embodiments, a cutting groove is provided at one end of the clamping member. The first clip and the second clip are respectively formed on both sides of the cutting groove.

[0008] In some embodiments, the head of the adjusting member is threadedly connected to the first clip, and the tail of the adjusting member abuts against the second clip. The adjusting member is used to adjust the distance between the first clip and the second clip when rotated, so that the clamping portion clamps the electrode tab of the battery.

[0009] In some embodiments, the adjusting member is an adjusting screw, and the wire is connected to the clamping member through the adjusting screw.

[0010] In some embodiments, the switch is a relay switch, and the relay switch has at least two pairs of contacts, and the relay switch is used to control the on and off of each pair of the contacts.

[0011] In some embodiments, the wire assembly includes a terminal block, the first end of the wire is electrically connected to the terminal block, the terminal block is provided with a plurality of parallel connection portions, and the plurality of connection portions are electrically connected to the plurality of contacts on one side of the relay switch in one-to-one correspondence.

[0012] In some embodiments, the wire assembly includes a terminal, the terminal includes a wire fixing portion and a connecting portion, the wire fixing portion is fixed to the end of the wire, the connecting portion has a connection hole, and the connection hole is connected to the switch or the clamping member.

[0013] In some embodiments, the battery external short-circuit test device includes a voltmeter, the voltmeter is connected to the wire, and the voltmeter is used to measure the external circuit voltage of the battery.

[0014] According to one aspect of the present application, in one embodiment, a battery external short-circuit test equipment is provided, including:

[0015] The battery external short-circuit test device as described in any one of the above embodiments;

[0016] An explosion-proof box for accommodating the battery and the wire assembly of the battery external short-circuit test device.

[0017] According to the battery external short-circuit test device and the battery external short-circuit test equipment of the above embodiments, the switch can control the conduction and disconnection of the two wire assemblies, thereby controlling the start and end of the battery external short-circuit test; in the wire assembly, the clamping member is provided with a clamping portion, which is convenient for connecting the wire to the ear of the battery; the clamping portion has a conductive surface, the contact area between the conductive surface and the ear of the battery is large, and the adjusting member can apply a clamping force, so that the contact between the conductive surface and the ear of the battery is more sufficient, the resistance value at the contact is small, the generated heat is less, and the heat can be released to the external environment more quickly through the clamping member, and it is not easy to occur the situation of ear melting and battery fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the battery external short-circuit test equipment in the present invention;

[0019] Figure 2 Figure 1 It is a schematic diagram of the assembly relationship between the clamping member, the battery and the wire.

[0020] Figure 3 is Figure 2 an enlarged view of a clamping member.

[0021] Reference numerals:

[0022] 1. Switch; 2. Wire assembly; 21. Wire; 22. Clamping member; 221. First clamping piece; 222. Second clamping piece; 223. Cutting groove; 23. Adjusting member; 24. Wiring row; 241. Wiring part; 25. Wiring terminal; 251. Wire fixing part; 252. Connecting part; 3. Battery; 31. Tab. Detailed implementation manners

[0023] The present application will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners adopt related similar element numbers. In the following implementation manners, many detailed descriptions are for better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid the core part of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0024] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners, and the operation steps involved in each embodiment can also be adjusted or reordered in an obvious manner by those skilled in the art. Therefore, the specification and the drawings are only for clearly describing a certain embodiment, and do not mean to be the necessary composition and / or order.

[0025] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0026] As Figure 1 shown, the battery external short - circuit test equipment of the embodiment of the present utility model includes an explosion - proof box (not shown in the figure), a switch 1, and a wire assembly 2. The battery 3 to be tested is placed in the explosion - proof box, and the switch 1 is placed outside the explosion - proof box. The explosion - proof box can isolate the battery 3 from the outside, avoiding the threat to personal and property safety caused by the battery 3 catching fire due to short - circuit.

[0027] There are two sets of wire assemblies 2, and the two sets of wire assemblies 2 are respectively used to connect the positive electrode tab 31 and the negative electrode tab 31 of the battery 3. The switch 1 is connected between the two sets of wire assemblies 2 and is used to control the conduction and disconnection of the two sets of wire assemblies 2.

[0028] Specifically, one set of wire assembly 2 is connected between the positive electrode tab 31 of the battery 3 and the switch 1, and the other set of wire assembly 2 is connected between the negative electrode tab 31 of the battery 3 and the switch 1. When the switch 1 is closed, the two sets of wire assemblies 2 are conducted, and at this time, a short circuit occurs outside the battery 3; when the switch 1 is opened, the two sets of wire assemblies 2 are disconnected, and the outside of the battery 3 is open-circuited. During the external short-circuit test of the battery, the staff can control the start and stop of the external short-circuit test through the switch 1.

[0029] The wire assembly 2 includes a wire 21, a clamping member 22 and an adjusting member 23. The first end of the wire 21 is electrically connected to the switch 1, and the second end of the wire 21 is electrically connected to the clamping member 22. The clamping member 22 includes a clamping portion, and the clamping portion has a conductive surface. The conductive surface is used to fit with the electrode tab 31 of the battery 3. The adjusting member 23 is used to apply a clamping force to the clamping portion so that the clamping portion clamps the electrode tab 31 of the battery 3.

[0030] The clamping member 22 includes a clamping portion, and the clamping portion has a conductive surface. It can be understood that: the clamping member 22 can clamp the electrode tab 31 of the battery 3 or loosen the electrode tab 31 of the battery 3; the conductive surface can be a plane, or the conductive surface is a concave surface or a convex surface adapted to the shape of the electrode tab 31 of the battery 3.

[0031] The adjusting member 23 is used to apply a clamping force to the clamping portion. It can be understood that: the adjusting member 23 can control the clamping portion to clamp the electrode tab 31 of the battery 3 or loosen the electrode tab 31 of the battery 3. The adjusting member 23 applies a clamping force so that the conductive surface of the clamping member 22 can be in full contact with the electrode tab 31 of the battery 3.

[0032] In the battery external short-circuit test equipment of the embodiment of the present invention, the clamping member 22 is provided with a clamping portion, and the clamping portion can clamp the electrode tab 31 of the battery 3, which is convenient for connecting the wire 21 to the electrode tab 31 of the battery 3. The clamping portion has a conductive surface, and the contact mode between the clamping member 22 and the electrode tab 31 is surface contact, and the contact area is large. On the other hand, the adjusting member 23 can apply a clamping force to the clamping portion, so that the contact between the conductive surface and the electrode tab 31 is more sufficient, the resistance value at the contact is smaller, and it is not easy to occur the situation that the electrode tab 31 melts and the battery 3 catches fire.

[0033] In addition, when the resistance value at the contact is small, the wire 21 is not easy to age due to excessive temperature, its own resistance value is relatively stable, it can meet the accuracy requirements of the resistance value for the battery external short-circuit test, and there is no need to replace it frequently, reducing the use cost of the test equipment.

[0034] In some embodiments, such as Figures 1-3As shown, the clamping part includes a first clamping piece 221 and a second clamping piece 222 arranged opposite to each other. The opposite surfaces of the first clamping piece 221 and the second clamping piece 222 form a conductive surface.

[0035] Both the first clamping piece 221 and the second clamping piece 222 are sheet-like structures, with a relatively large contact area with the tab 31 of the battery 3, a relatively small resistance at the contact, and less heat generated during the test. At the same time, the sheet-like structure has a relatively large heat dissipation area, and the generated heat can be released to the external environment in a timely manner, and it is not easy to occur the situation that the tab 31 of the battery 3 is melted and the test is terminated, and the integrity and effectiveness of the test are better.

[0036] In some embodiments, as Figures 1-3 shown, a cut groove 223 is provided at one end of the clamping member 22, and the first clamping piece 221 and the second clamping piece 222 are respectively formed on both sides of the cut groove 223.

[0037] Specifically, the clamping member 22 can be in the shape of a cuboid. After a cut groove 223 is opened at one end of the clamping member 22, the first clamping piece 221 and the second clamping piece 222 arranged at intervals are formed. The areas of the first clamping piece 221 and the second clamping piece 222 are larger than the area of the tab 31 of the battery 3. The material of the clamping member 22 can be copper with good thermal conductivity, and the heat generated during the test process can be released to the external environment in a timely manner, and it is not easy to occur the situation that the tab 31 of the battery 3 is melted or the battery 3 catches fire.

[0038] In other embodiments, the first clamping piece 221 and the second clamping piece 222 of the clamping member 22 can also be made by casting or stamping.

[0039] In some embodiments, as Figures 1-3 shown, the head of the adjusting member 23 is threadedly connected to the first clamping piece 221, the tail of the adjusting member 23 abuts against the second clamping piece 222, and the adjusting member 23 is used to adjust the distance between the first clamping piece 221 and the second clamping piece 222 when rotating, so that the clamping part clamps the tab 31 of the battery 3. Specifically, the adjusting member 23 can be an adjusting screw. Rotating the adjusting screw can clamp the tab 31 of the battery 3 or loosen the tab 31 of the battery 3, which is convenient for the staff to assemble or disassemble the wire assembly 2.

[0040] In some embodiments, as Figures 1-3 shown, the adjusting member 23 is an adjusting screw, and the wire 21 is connected to the clamping member 22 through the adjusting screw. Specifically, the wire 21 can be placed between the tail of the adjusting screw and the second clamping piece 222. Rotating the adjusting screw can not only make the clamping member 22 clamp the tab 31 of the battery 3, but also realize the connection between the wire 21 and the clamping member 22. When it is necessary to disassemble the wire assembly 2, just loosen the adjusting screw, which is relatively convenient to use.

[0041] In some embodiments, as Figures 1-3As shown, switch 1 is relay switch 1. Relay switch 1 has at least two pairs of contacts, and relay switch 1 is used to control the on / off of each pair of contacts. Since the current is large when the battery 3 is short-circuited externally, using relay switch 1 can avoid directly controlling the external short-circuit current, making the test process safer.

[0042] In some embodiments, as Figures 1-3 shown, wire assembly 2 includes connection terminal block 24. The first end of wire 21 is electrically connected to connection terminal block 24. Connection terminal block 24 is provided with a plurality of parallel connection parts 241, and the plurality of connection parts 241 are electrically connected to the plurality of contacts on one side of relay switch 1 in one-to-one correspondence.

[0043] Specifically, connection terminal block 24 may include three connection parts 241, and the three connection parts 241 are respectively connected to the three contacts on one side of relay switch 1 in one-to-one correspondence. The above setting can parallel the three circuits corresponding to the three pairs of contacts on relay switch 1, reduce the resistance value of the part of relay switch 1 in the external circuit of battery 3, and can meet the requirement of a smaller resistance value for the short-circuit test.

[0044] In some embodiments, as Figures 1-3 shown, wire assembly 2 includes terminal 25. Terminal 25 includes wire fixing part 251 and connection part 252. Wire fixing part 251 is fixed to the end of wire 21, and connection part 252 has a connection hole, and the connection hole is connected to switch 1 or clamping member 22.

[0045] Specifically, a conductive screw can be used to pass through the connection hole to connect terminal 25 to switch 1 or clamping member 22. The setting of the connection hole makes the connection and disassembly of terminal 25 with switch 1 and clamping member 22 more convenient.

[0046] In some embodiments, the battery external short-circuit test equipment may include a voltmeter. The voltmeter is connected to wire 21, and the voltmeter is used to measure the external circuit voltage of battery 3. Specifically, the voltmeter can be connected to terminal 25 at the end of wire 21. Setting the voltmeter facilitates the staff to observe the external voltage change during the short-circuit process of battery 3 and determine whether battery 3 has finished discharging.

[0047] Next, the battery external short-circuit test device according to the embodiments of the present invention will be described.

[0048] The battery external short-circuit test device according to the embodiments of the present invention has the same structure as the battery external short-circuit test device in the battery external short-circuit test equipment in any of the above embodiments, and will not be elaborated here.

[0049] Next, the usage process of the battery external short-circuit test equipment according to the embodiments of the present invention will be described.

[0050] Place the tab 31 of the battery 3 between the first clip 221 and the second clip 222 of the clamping member 22, and rotate the adjustment screw to make the clamping member 22 in close contact with the tab 31.

[0051] Put the connected battery 3 and the wire 21 into the explosion-proof box through the side hole of the explosion-proof box, place the relay switch 1 outside the explosion-proof box for easy operation of closing and opening the switch 1. Clip the test leads of the multimeter onto the terminal 25 at the end of the wire 21 and set it to the voltage range.

[0052] Start the temperature control function of the explosion-proof box. After waiting for the temperature on the surface of the battery 3 to reach the predetermined temperature and stabilize, close the relay switch 1, an external short-circuit resistance is formed, and the battery 3 starts to short-circuit.

[0053] During the short-circuit process, electrons flow from the negative electrode to the positive electrode, and the reverse current flows from the positive electrode to the negative electrode. Since the external short-circuit resistance is extremely small, the short-circuit current is very large. A large amount of heat accumulates on the negative tab 31 of the battery 3 and quickly spreads through the clamping copper block, which not only ensures the connection state of the tab 31 but also ensures that the tab 31 will not be melted due to excessive temperature resulting in the termination of the short circuit.

[0054] Observe the reading of the multimeter. When the voltage approaches 0V, it means the short circuit ends. Disconnect the relay switch 1, take out the battery 3, and the test is over.

[0055] The above uses specific examples to elaborate on the present utility model, which is only used to help understand the present utility model and is not intended to limit the present utility model. For those skilled in the technical field to which the present utility model belongs, based on the idea of the present utility model, several simple deductions, deformations or substitutions can also be made.

Claims

1. A battery external short circuit test device, characterized in that, It includes a wire assembly and a switch. There are two sets of wire assemblies, and the two sets of wire assemblies are respectively used to connect the positive electrode tab and the negative electrode tab of the battery. The switch is connected between the two sets of wire assemblies and is used to control the conduction and disconnection of the two sets of wire assemblies. The wire assembly includes a wire, a clamping member, and an adjusting member. The first end of the wire is electrically connected to the switch, and the second end of the wire is electrically connected to the clamping member. The clamping member includes a clamping portion, and the clamping portion has a conductive surface, which is used to fit with the electrode tab of the battery. The adjusting member is used to apply a clamping force to the clamping portion so that the clamping portion clamps the electrode tab of the battery.

2. The battery external short circuit test device according to claim 1, characterized in that, The clamping portion includes a first clip and a second clip arranged oppositely, and the opposite surfaces of the first clip and the second clip form the conductive surface.

3. The battery external short circuit test device according to claim 2, wherein One end of the clamping member is provided with a cutting groove, and the first clip and the second clip are respectively formed on both sides of the cutting groove.

4. The battery external short-circuit test device according to claim 2, characterized in that, The head of the adjusting member is threadedly connected to the first clip, and the tail of the adjusting member abuts against the second clip. The adjusting member is used to adjust the distance between the first clip and the second clip when rotating so that the clamping portion clamps the electrode tab of the battery.

5. The battery external short circuit test device according to claim 4, characterized in that, The adjusting member is an adjusting screw, and the wire is connected to the clamping member through the adjusting screw.

6. The battery external short-circuit test device according to claim 1, wherein, The switch is a relay switch, and the relay switch has at least two pairs of contacts. The relay switch is used to control the on-off of each pair of contacts.

7. The battery external short circuit test device according to claim 6, characterized in that The wire assembly includes a wiring row. The first end of the wire is electrically connected to the wiring row. The wiring row is provided with a plurality of parallel wiring portions, and the plurality of wiring portions are respectively and electrically connected to the plurality of contacts on one side of the relay switch.

8. The battery external short circuit test device according to any one of claims 1-7, characterized in that, The wire assembly includes a terminal block. The terminal block includes a wire fixing portion and a connecting portion. The wire fixing portion is fixed to the end of the wire, and the connecting portion has a connecting hole, and the connecting hole is connected to the switch or the clamping member.

9. The external short-circuit test device for a battery according to any one of claims 1-7, characterized in that it includes a voltmeter, and the voltmeter is connected to the wire and is used to measure the external circuit voltage of the battery.

10. A battery external short-circuit test device, characterized in that, It includes: the external short-circuit test device for a battery according to any one of claims 1-9; an explosion-proof box, which is used to accommodate the battery and the wire assembly of the external short-circuit test device for the battery.

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