Explosion-proof cell short circuit testing device
By using insulated base and clamp structure in cell short circuit test, the problem of unstable contact resistance is solved and the accuracy of test results is ensured.
Patent Information
- Application Number
- CN202421386863.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-06-17
AI Technical Summary
In the existing battery cell short circuit test, the contact between the clip and the battery cell is point contact, and the contact resistance is unstable, which can easily cause the pole ear to be burned or loose, resulting in test failure and inaccurate results.
The insulated base and clamping member structure is adopted to fix the test connection wire and clamping member through the locking member, eliminating the stress of the connecting wire, increasing the contact area of the extreme ears, and avoiding poor contact.
The test connection wire and the battery cell ears are achieved to prevent unstable contact resistance and ensure the accuracy of the test results.
Smart Images
Figure CN223308232U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of lithium battery technology, and in particular to an explosion-proof battery cell short-circuit testing device. Background Art
[0002] As the name suggests, explosion-proof lithium batteries are highly safe. Designed for use in specialized environments and applications, they employ a series of specialized safety measures to effectively mitigate the risk of explosion, thereby ensuring safe operation of equipment. The quality of the battery directly impacts the quality of the cell. Currently, to ensure battery quality, a short-circuit test is often performed using a cell short-circuit tester.
[0003] When performing an external short-circuit test on an explosion-proof lithium battery, the existing technology is to directly place the test lithium battery in a laboratory cabinet and use the clamps provided by the laboratory cabinet to clamp the positive and negative pole tabs of the battery cell to perform the short-circuit test. However, since this experiment requires that the resistance of the external circuit of the battery cell be less than 3 milliohms, the copper cable connected to the tabs of the battery cell must be thick enough. Thick cables have greater stress and are connected to thin battery cells, making them difficult to fix and conduct, and will have a certain elastic pull on the clamps and the tabs of the battery cell. Under this requirement, the current of the entire circuit can reach more than 70 amperes in actual testing, which requires that the resistance of the contact part of the entire circuit be small enough. If the contact resistance is large, it will heat up and cause melting.
[0004] When performing a short-circuit test on a battery cell, the above solution has point contact between the clamp and the battery cell, and the assembly cable can easily tear off the tab during the test, resulting in unstable contact resistance. Large contact resistance will generate heat and cause melting, causing the clamped tab to burn out or become loose, or the poor contact will cause the loop resistance to be too large during the test, thus meeting the resistance requirement of the poor test, resulting in test failure and inaccurate test results. Utility Model Content
[0005] The present application provides an explosion-proof battery cell short-circuit testing device, which can avoid the situation where the contact resistance is unstable due to the copper wire connecting the tabs being too thick.
[0006] According to the present application, an embodiment provides an explosion-proof battery short-circuit test device, including two test connection lines, the two test connection lines are respectively used to conduct with the positive and negative battery cells of the battery cell, and further includes:
[0007] A base, used for placing the battery cell, the base is insulated, and the connection end of the test connection line is positioned on the base;
[0008] a pair of clamping members, respectively used to clamp the positive and negative tabs of the battery cell, the clamping members comprising an upper pressing block and a lower pressing block of identical structure and arranged opposite to each other, the lower pressing block and the upper pressing block being stacked on the base in sequence, and the connecting end of the test connection line being clamped between the base and the lower pressing block, the upper pressing block and the lower pressing block being conductively arranged and used to clamp the tabs of the battery cell to conduct the test connection line and the tabs of the battery cell; and
[0009] A locking piece is used to press the upper pressing block and the lower pressing block onto the base.
[0010] In another embodiment, a buffer net is covered on one side of the upper pressing block and the lower pressing block that are close to each other. The buffer net is conductively arranged and is used to be in close contact with the tab of the battery cell.
[0011] In another embodiment, the locking member includes a locking bolt and a locking nut, the locking bolt passes through the base, the connecting end of the test connection line, the lower pressure block and the upper pressure block in sequence, and the locking nut is threadedly connected to one end of the locking bolt passing through the upper pressure block.
[0012] In another embodiment, the upper pressing block and the lower pressing block are provided with a slot for embedding the buffer net, and a limiting portion is detachably connected to the slot, and the limiting portion is used to be clamped in the slot and position the buffer net.
[0013] In another embodiment, the buffer net is arranged beyond the two side surfaces of the upper pressing block and the lower pressing block, and the card slots are arranged on two adjacent side surfaces of the buffer net covering surface to make the covering surface of the buffer net flat.
[0014] In another embodiment, the slot is provided with through-holes at both ends along the length direction, and the limiting portion is slidably installed in the slot along the length direction of the slot.
[0015] In another embodiment, the width of the cross section of the slot gradually increases from the slot opening to the slot bottom, and the cross section of the limiting portion corresponds to the cross section of the slot to limit the limiting portion from detaching from the slot opening of the slot.
[0016] In another embodiment, the limiting portion includes a pressure strip and a limiting head that are arranged perpendicular to each other, the pressure strip is slidably installed in the card slot, and the limiting head is arranged outside the card slot to limit the limiting portion from being completely embedded in the card slot.
[0017] In another embodiment, the base is configured to be stepped, and the clamping member and the battery cell are respectively arranged at different heights of the base, so that the clamping member and the positive and negative electrodes of the battery cell are at the same height.
[0018] In another embodiment, an isolation portion is provided on the base, and the isolation portion is provided between the two groups of the clamping members.
[0019] According to the explosion-proof battery cell short-circuit test device of the above embodiment, the test connection line is connected to the insulating base, and the positive and negative pole tabs of the battery cell are clamped by the stacked upper and lower pressing blocks, and the test connection line and the lower pressing block are fixed together by a locking piece, so as to achieve conduction between the test connection line and the pole tabs of the battery cell. On the one hand, direct contact between the test connection line and the pole tabs of the battery cell is avoided, and the stress of the test connection line is eliminated, thereby avoiding the pulling of the pole tabs by the stress of the thick connecting cable. On the other hand, the pole tabs are pressed up and down by the upper and lower pressing blocks, which increases the contact area of the pole tabs of the battery cell, avoids point contact, and avoids the pole tabs from heating and melting due to the small contact area of the clamps during the test, so that the contact resistance is stable during the test, further ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the overall structure of the explosion-proof battery short-circuit test device;
[0021] Figure 2 This is an exploded view of an explosion-proof battery cell short-circuit test device along the vertical direction in one embodiment;
[0022] Figure 3 is a schematic structural diagram of a clamping member according to another embodiment;
[0023] Figure 4 This is a partial structural diagram of a clamping member in another embodiment.
[0024] Figure markings: 1. Base; 11. Isolation part; 2. Test connection line; 21. Connection end; 22. Cable; 3. Clamping part; 31. Upper pressure block; 32. Lower pressure block; 33. Buffer net; 34. Slot; 35. Limiting part; 351. Pressure strip; 352. Limiting head; 4. Locking part; 41. Locking bolt; 42. Locking nut; 5. Battery cell; 51. Tab. DETAILED DESCRIPTION
[0025] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion 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. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.
[0026] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various implementations, and the operational steps involved in each embodiment may be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a particular embodiment and do not imply a required composition and / or sequence.
[0027] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).
[0028] When performing an external short-circuit test on explosion-proof lithium batteries, the existing technology involves simply placing the test lithium battery in a test cabinet and using the cabinet's built-in clips to clamp the positive and negative tabs of the battery cell to perform the short-circuit test. However, since this test requires the resistance of the battery cell's external circuit to be less than 3 milliohms, the copper cable connecting the tabs to the battery cell must be sufficiently thick and have very good contact to meet this test requirement. However, thick cables have high stress and are connected to thin cells, making them difficult to fix and conduct, and they will exert a certain elastic force on the clips and the tabs of the battery cell. Under these requirements, the current of the entire circuit can reach over 70 amperes in actual testing, which requires the contact resistance of the entire circuit to be sufficiently low. If the contact resistance is too high, it will heat up and cause melting. The contact between the clip and the battery cell is point contact, which can easily tear the tabs during the test, resulting in unstable contact resistance. When performing a short-circuit test on the battery cell, the tabs are prone to burning or loosening, or poor contact causes the circuit resistance to be too high during the test, failing to meet the resistance requirement for the test, resulting in test failure and inaccurate test results.
[0029] The present application provides an explosion-proof battery cell short-circuit testing device, which connects the test connection wire 2 to the insulating base 1 to eliminate the stress of the test connection wire 2, and then clamps the positive and negative pole tabs 51 of the battery cell 5 through the stacked upper pressing block 31 and the lower pressing block 32, and fixes the test connection wire 2 and the lower pressing block 32 together through the locking member 4, thereby achieving conduction between the test connection wire 2 and the pole tab 51 of the battery cell 5, avoiding the situation where the contact resistance is unstable due to the copper wire connecting the pole tab 51 being too thick.
[0030] Please refer to Figure 1 and Figure 2 In one embodiment, an explosion-proof battery short-circuit test device is provided, comprising a base 1, two test connection wires 2 connected to the base 1, a pair of clamps 3, and a locking member 4 for mounting the clamps 3 on the base 1. The base 1 is insulated and used to place the battery cell 5. The test connection wire 2 has a connection end 21 and a cable 22. The connection end 21 of the test connection wire 2 is positioned on the base 1; two sets of clamps 3 are respectively used to clamp the positive and negative pole tabs 51 of the battery cell 5. The clamps 3 include an upper pressing block 31 and a lower pressing block 32 with the same structure and arranged opposite to each other. The lower pressing block 32 and the upper pressing block 31 are stacked on the base 1 in sequence, and the connection end 21 of the test connection wire 2 is clamped between the base 1 and the lower pressing block 32. The upper pressing block 31 and the lower pressing block 32 are conductively arranged and used to clamp the tab 51 of the battery cell 5 to conduct the test connection wire 2 and the tab 51 of the battery cell 5; the locking member 4 is used to press the upper pressing block 31 and the lower pressing block 32 on the base 1.
[0031] Please refer to Figure 1 and Figure 2 In the embodiment of the present application, the base 1 adopts a marble platform, and the connecting end 21 of the test connection line 2 is set to a flat structure; specifically, the locking member 4 includes a locking bolt 41 and a locking nut 42. The locking bolt 41 passes through the base 1, the connecting end 21 of the test connection line 2, the lower pressure block 32 and the upper pressure block 31 from bottom to top. The locking nut 42 is threadedly connected to the end of the locking bolt 41 passing through the upper pressure block 31. The locking nut 42 adopts a dovetail nut, which is convenient for manual knob force application. Through the cooperation of the locking bolt 41 and the locking nut 42, the tab 51 of the battery cell 5 is clamped between the upper pressure block 31 and the lower pressure block 32, thereby achieving conduction between the test connection line 2 and the tab 51 of the battery cell 5.
[0032] Through the above technical solution, the overly thick test connection line 2 is fixed on the marble base 1, eliminating the stress of the cable 22, and the base 1, the connection end 21 of the test connection line 2, the lower pressure block 32 and the upper pressure block 31 are connected by the locking bolt 41 and the locking nut 42, and the pole ear 51 of the battery cell 5 is pressed tightly by the pressure of the nut, which plays the role of fixing the test connection line 2 and maintaining good contact with the pole ear 51, avoiding direct contact between the test connection line 2 and the pole ear 51 of the battery cell 5, thereby avoiding the pulling of the pole ear 51 by the excessive thickness of the test connection line 2, and increasing the contact area of the pole ear 51 of the battery cell 5, avoiding poor contact caused by the clamp clamping the pole ear 51 of the battery cell 5, so that the contact resistance is stable during the test, and further ensuring the accuracy of the test results.
[0033] For further information, please refer to Figure 1 and Figure 2 The side where the upper pressing block 31 and the lower pressing block 32 are close to each other is covered with a buffer net 33. The buffer net 33 is conductively configured and is used to fit tightly against the tab 51 of the battery cell 5. The tab 51 is pressed down by the upper pressing block 31 and the lower pressing block 32 covered with the buffer net 33. The tab 51 is a nickel sheet and is not easy to be made very flat. The buffer net 33 has a certain thickness, which can make up for the unevenness of the tab 51 of the battery cell 5, further increase the contact area with the tab 51 of the battery cell 5, avoid point contact, further ensure the stability of the contact resistance, and avoid the tab 51 from burning out or the short-circuit resistance being too large to meet the test requirements.
[0034] Please refer to Figure 3 and Figure 4 In the embodiment of the present application, the buffer net 33 is made of copper net, and the upper pressing block 31 and the lower pressing block 32 are also made of copper blocks; in order to facilitate the installation and replacement of the buffer net 33, a card slot 34 for embedding the buffer net 33 is opened on the upper pressing block 31 and the lower pressing block 32, and the buffer net 33 is arranged beyond the two side surfaces of the upper pressing block 31 and the lower pressing block 32. The card slot 34 is opened on the two adjacent side surfaces of the covering surface of the buffer net 33 to make the covering surface of the buffer net 33 flat; a limiting part 35 is detachably connected to the card slot 34, and the limiting part 35 is used to be clamped in the card slot 34 and position the buffer net 33. The card slot 34 is set through at both ends along the length direction, and the limiting part 35 can be slidably installed in the card slot 34 along the length direction of the card slot 34.
[0035] For details, please refer to Figure 3 and Figure 4The limiting portion 35 includes a pressure strip 351 and a limiting head 352 arranged perpendicular to each other. The pressure strip 351 is slidably installed in the card slot 34, and the limiting head 352 is arranged outside the card slot 34 to limit the limiting portion 35 from being completely embedded in the card slot 34; the cross-section of the card slot 34 gradually increases from the slot opening to the slot bottom, and the cross-section of the limiting portion 35 corresponds to the cross-section of the card slot 34 to limit the limiting portion 35 from being separated along the slot opening of the card slot 34; the buffer net 33 fits the covering surface and leaves a margin on both sides for easy positioning. The remaining buffer net 33 is bent and fits to the side and is embedded in the card slot 34, and the pressure strip 351 is inserted to press the buffer net 33 between the bottom of the card slot 34 and the pressure strip 351 to complete the positioning of the buffer net 33, and the pressure strip 351 is used to fix the buffer net 33, which is convenient for disassembly and addition of the thickness of the buffer net 33.
[0036] Please refer to Figure 1 and Figure 2 , the base 1 is set to be stepped, and the clamping member 3 and the battery cell 5 are respectively set at different heights of the base 1, so that the clamping member 3 and the positive and negative electrodes of the battery cell 5 are at the same height. Specifically, the battery cell 5 is placed horizontally on the high plane, and the tabs 51 of the battery cell 5 are facing the side of the low plane. The clamping member 3 is placed on the low plane, and the two groups of clamping members 3 are used to clamp the positive and negative tabs 51 of the battery cell 5 respectively; an isolation part 11 is provided at the low plane, and the isolation part 11 is provided between the two groups of clamping members 3 to isolate the positive and negative tabs 51 of the battery cell 5 and prevent the positive and negative tabs 51 of the battery cell 5 from short-circuiting. The battery cell 5 to be tested is fixed on the horizontal plane of the platform. During the test, the battery does not move horizontally due to swelling, which makes it convenient to attach a temperature probe to the positive surface of the battery and to detect the temperature change curve during the short-circuit process in real time during the experiment.
[0037] In the embodiment of the present application, the test device needs to be assembled before the battery cell 5 is tested. For details, please refer to Figure 2 , first pass the locking bolt 41 through the base 1, and pass the connecting end 21 of the test connection line 2 into the locking bolt 41, and then press the buffer net 33 into the card slot 34 through the pressure strip 351, so that the buffer net 33 flatly covers the contact surface of the battery cell 5 pole ear 51, and then install the lower pressing block 32, and then place the pole ear 51 of the battery cell 5 on the buffer net 33 of the lower pressing block 32, install the upper pressing block 31, press the buffer net 33 with one side of the upper pressing block 31 against the pole ear 51, tighten the locking nut 42, and complete the installation of the test device; when testing, connect the two test connection lines 2 to the switch or to the positive and negative poles on the short-circuit tester, close the switch or start the short-circuit tester to perform a short-circuit test. The device has a simple structure and is easy to assemble, and the assembly does not require tools and can be completed manually, which is simple to operate and saves time and effort.
[0038] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.
Claims
1. An explosion-proof battery short-circuit test device, comprising two test connection lines (2), wherein the two test connection lines (2) are respectively used to conduct with the positive and negative electrodes (5) of a battery (5), and characterized in that: Also includes: A base (1) for placing a battery cell (5), the base (1) being insulated, and the connection end (21) of the test connection line (2) being positioned on the base (1); A pair of clamping members (3) are respectively used to clamp the positive and negative pole tabs (51) of the battery cell (5); the clamping members (3) include an upper pressing block (31) and a lower pressing block (32) having the same structure and arranged opposite to each other; the lower pressing block (32) and the upper pressing block (31) are sequentially stacked on the base (1); and the connecting end (21) of the test connection line (2) is clamped between the base (1) and the lower pressing block (32); the upper pressing block (31) and the lower pressing block (32) are conductively arranged and used to clamp the pole tabs (51) of the battery cell (5) to conduct the test connection line (2) and the pole tabs (51) of the battery cell (5); as well as A locking member (4), wherein the locking member (4) is used to press the upper pressing block (31) and the lower pressing block (32) onto the base (1).
2. The explosion-proof battery short-circuit test device according to claim 1, characterized in that: The side where the upper pressing block (31) and the lower pressing block (32) are close to each other is covered with a buffer net (33), and the buffer net (33) is conductively arranged and used to be in close contact with the tab (51) of the battery cell (5).
3. The explosion-proof battery short-circuit test device according to claim 1, characterized in that: The locking member (4) includes a locking bolt (41) and a locking nut (42); the locking bolt (41) passes through the base (1), the connection end (21) of the test connection line (2), the lower pressing block (32) and the upper pressing block (31) in sequence; the locking nut (42) is threadedly connected to one end of the locking bolt (41) passing through the upper pressing block (31).
4. The explosion-proof battery short-circuit test device according to claim 2, characterized in that: The upper pressing block (31) and the lower pressing block (32) are provided with a card slot (34) for embedding the buffer net (33), and a limiting portion (35) is detachably connected in the card slot (34). The limiting portion (35) is used to be locked in the card slot (34) and position the buffer net (33).
5. The explosion-proof battery short-circuit test device according to claim 4, characterized in that: The buffer net (33) is arranged beyond the two side surfaces of the upper pressing block (31) and the lower pressing block (32), and the card slots (34) are arranged on two adjacent side surfaces of the buffer net (33) covering surface, so that the covering surface of the buffer net (33) is flat.
6. The explosion-proof battery short-circuit test device according to claim 5, characterized in that: The card slot (34) is provided with through-holes at both ends along the length direction, and the limiting portion (35) is slidably installed in the card slot (34) along the length direction of the card slot (34).
7. The explosion-proof battery short-circuit test device according to claim 6, characterized in that: The width of the cross section of the slot (34) gradually increases from the slot opening to the slot bottom, and the cross section of the limiting portion (35) corresponds to the cross section of the slot (34) to limit the limiting portion (35) from being disengaged along the slot opening of the slot (34).
8. The explosion-proof battery short-circuit test device according to claim 5, characterized in that: The limiting portion (35) comprises a pressure strip (351) and a limiting head (352) arranged perpendicular to each other, the pressure strip (351) is slidably installed in the card slot (34), and the limiting head (352) is arranged outside the card slot (34) to limit the limiting portion (35) from being completely embedded in the card slot (34).
9. The explosion-proof battery short-circuit test device according to any one of claims 1 to 8, characterized in that: The base (1) is arranged in a stepped shape, and the clamping member (3) and the battery cell (5) are respectively arranged at different heights on the base (1), so that the clamping member (3) and the positive and negative electrodes (5) of the battery cell (5) are at the same height.
10. The explosion-proof battery short-circuit test device according to claim 9, characterized in that: An isolation portion (11) is provided on the base (1), and the isolation portion (11) is provided between the two groups of clamping members (3).