Test probe

Abstract

The utility model discloses a test probe. The test probe comprises a probe group and a connecting sheet which are arranged on a probe seat, the probe group comprises a main probe group and a plurality of branch probe groups, the main probe group and the branch probe groups are identical in structure, each branch probe group comprises a current probe and a voltage probe which is located in the current probe and coaxially arranged, and the connecting piece comprises a current test connecting part and an integration part which are connected with an external power supply. And the current probes on the plurality of branch probe groups are positioned on the integration part so as to realize parallel connection with an external power supply. According to the utility model, voltage can be monitored synchronously during current testing, and a plurality of current testing ends are integrated into one current testing connection lead, so that the current testing connection leads are prevented from being disordered and tedious.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing, in particular to a testing probe. Background Art

[0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and long charge and discharge life. Therefore, they are widely used in products in many fields such as electronic products, portable small appliances, and energy storage systems. Lithium batteries have no electricity when they are assembled and must be charged and activated. The first charge is called "formation", which is used to activate the active materials in the battery. Formation is also called "activation". Formation is a very complicated process and also a very important process that affects battery performance. Because during the first charge of the battery, it is inevitable to form a passivation layer covering the surface of the carbon electrode at the interface between the carbon negative electrode and the electrolyte, which is called the solid electrolyte interface film or SEI film.

[0003] After the battery is formed, it comes to the last step - capacity division. Capacity division is to charge and discharge the battery, and detect the discharge capacity when the capacity division is full to determine the battery capacity. Only when the tested capacity meets or exceeds the designed capacity, the lithium battery is qualified, and the battery with less than the designed capacity cannot be considered a qualified battery. This process of screening out qualified batteries through capacity testing is called capacity division.

[0004] The existing test probes for battery capacity division are only equipped with current probes, which cannot monitor the voltage on the lithium battery while testing the current; on the other hand, when multiple battery terminals on the same battery pack need to be tested, each corresponding test probe needs to be connected to a current test lead, which results in many and complicated leads, making it inconvenient for users to use the layout.

[0005] Therefore, it is necessary to provide a test probe to solve the above problems. Utility Model Content

[0006] In order to overcome the above disadvantages, the purpose of the utility model is to provide a test probe that can synchronously monitor voltage when testing current, and integrate multiple current test terminals into one current test connection lead to avoid the clutter and cumbersome current test connection lead.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is: a test probe, including a probe group and a connecting piece arranged on a probe seat; the probe group includes a main probe group and multiple sub-probe groups with the same structure, the sub-probe group includes a current probe and a voltage probe located inside and coaxially arranged therein, the connecting piece includes a current test connection part connected to an external power supply and an integrated part, and the current probes on the multiple sub-probe groups are located on the integrated part to realize parallel connection with the external power supply.

[0008] Furthermore, the plurality of sub-probe groups are arranged around the main probe group, so as to facilitate parallel integration of the connection terminals of the current probes on the plurality of sub-probe groups.

[0009] Furthermore, the current test connection part and the integrated part are integrally formed and arranged perpendicular to each other. The integrated part is provided with a plurality of probe jacks for current probes to insert and contact. The middle of the integrated part is provided with a recess for accommodating the main probe group.

[0010] The integrated part is arranged horizontally, and the straight line in the length direction of the current test connection part is parallel to the straight line in the length direction of the voltage probe. The end of the current test connection part away from the integrated part is used to connect an external power supply to perform current detection on the lithium battery. There is no need to connect the current test connection ends on the tops of the current probes on multiple branch probe groups in sequence to the leads connected to the external power supply. It is only necessary to energize the current test part on the connecting piece to achieve energizing of the current probes on the multiple branch probe groups.

[0011] The arrangement of the give way groove is used to avoid the main probe group arranged on the probe seat. The give way groove is located on the integrated part and extends toward the outer edge of the side away from the current test connection part. On the one hand, it can facilitate the disassembly of the connecting piece, and on the other hand, it can effectively reduce the processing cost of the connecting piece.

[0012] Furthermore, the probe seat is provided with a plurality of probe slots for inserting the probe group, the current probe is provided with a first spring at its detection end and the lower surface of the probe seat, the middle of the current probe is provided with a receiving slot for inserting the voltage probe, and the voltage probe is provided with a second spring at its voltage test connection end and its detection end. The probe seat is used to fix the position of the probe group, and the first spring and the second spring can play a buffering role when the current probe and the voltage probe move downward to contact the lithium battery to be tested.

[0013] Furthermore, the top of the current probe is a current test connection end, and the current test connection end is threadedly connected to a support nut, the lower surface of the support nut is in contact with the upper surface of the probe seat, the integrated part is placed on the support nut, and its upper surface is connected to the locking nut threadedly locked on the top of the current test connection end through a protective pad. By setting the support nut, the stability of current detection is ensured.

[0014] By providing the protective pad, the connecting piece can be prevented from being damaged when being locked by the locking nut, thereby effectively ensuring the service life of the connecting piece.

[0015] Furthermore, the sub-probe group also includes a sub-connection component, which includes a fixing part and a gasket inserted on the top of the current probe on the sub-probe group, and an annular groove is opened along the circumference of the top of the voltage probe on the sub-probe group near the voltage test connection end, and the gasket is clamped in the annular groove, and the lower surface of the gasket is in contact with the upper surface of the fixing part. By setting the fixing part and the gasket, the voltage probe will not be separated from the receiving groove opened in the middle of the current probe, ensuring the coaxial setting of the voltage probe and the current probe, thereby synchronously realizing the detection and monitoring of current and voltage.

[0016] Furthermore, the main probe group also includes a main connection component, which includes a mounting piece inserted on the main probe group, a through slot for the voltage probe on the main probe group to be inserted and penetrated is provided on the mounting piece along its height direction, a through pin insertion hole is provided on the side of the mounting piece along the horizontal direction, and a strip slot is provided near the voltage test connection end of the voltage probe on the main probe group, and the strip slot and the pin insertion hole are connected by a plug. The mounting piece, the plug and the voltage probe on the main probe group cooperate with each other, so that the voltage probe can move up and down inside the current probe on the main probe group, and the strip slot vertically provided on the voltage probe matches the pin insertion hole, which can effectively limit the moving distance of the voltage probe in the vertical direction, so that it meets the requirements of lithium battery voltage detection.

[0017] Beneficial effects of the utility model:

[0018] In the utility model, the main probe group, the sub-probe group, the current probe, the voltage probe and the connecting piece cooperate with each other, so that the voltage can be monitored synchronously when the current is tested. Multiple current test terminals are integrated into one current test connection lead to avoid the clutter and cumbersomeness of the current test connection lead. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an isometric view of the overall structure of an embodiment of the utility model;

[0020] Figure 2 It is an isometric view of the overall structure of an embodiment of the utility model from another viewing angle;

[0021] Figure 3 This is a schematic cross-sectional view of the overall structure of an embodiment of the utility model;

[0022] Figure 4 It is another schematic cross-sectional view of the overall structure of an embodiment of the utility model;

[0023] Figure 5 This is an axial view of a connecting piece according to an embodiment of the utility model;

[0024] In the figure: 1. probe holder; 2. main probe group; 3. sub-probe group; 4. current probe; 5. voltage probe; 6. sub-connection assembly; 61. fixing piece; 62. gasket; 7. connecting piece; 71. current test connection part; 72. clearance groove; 73. probe socket; 74. integrated part; 8. current test connection end; 9. voltage test connection end; 10. first spring; 11. second spring; 12. main connection assembly; 121. mounting piece; 122. latch; 123. strip slot; 124. pin socket; 13. support nut; 14. locking nut; 15. protective pad. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] See attached Figures 1 to 5 As shown, a test probe in this embodiment includes a probe group and a connecting piece 7 arranged on a probe seat 1; the probe group includes a main probe group 2 and multiple sub-probe groups 3 with the same structure, the sub-probe group 3 includes a current probe 4 and a voltage probe 5 located inside and coaxially arranged therein, the connecting piece 7 includes a current test connection part 71 connected to an external power supply and an integrated part 74, and the current probes 4 on the multiple sub-probe groups 3 are located on the integrated part 74 to realize parallel connection with the external power supply.

[0027] The current probe 4 and the voltage probe 5 are coaxially arranged, so that the voltage can be monitored synchronously while testing the current on the lithium battery. The current probes 4 on the multiple sub-probe groups 3 are located on the integrated part 74, and the end of the current test connection part 71 away from the integrated part 74 is connected to the external power supply, that is, the current probes 4 on the multiple sub-probe groups 3 only need one current test connection lead to realize their synchronous detection of current, and there is no need to connect the current probe 4 on each sub-probe group 3 to the current test connection lead, which effectively avoids the phenomenon of multiple leads being piled up in a mess, so that the lead layout of the test probe is reasonable when in use.

[0028] In some embodiments, the current probe 4 and the voltage probe 5 are both made of beryllium copper, which is hardened by heat treatment to effectively increase rigidity and wear resistance, thereby effectively improving the service life of the current probe 4 and the voltage probe 5. The test end on the voltage probe 5 protrudes from the end face of the test end on the current probe 4.

[0029] In some embodiments, during testing, the main probe group 2 and the sub-probe group 3 are in contact with the positive electrode and the negative electrode on the lithium battery respectively, so that a complete closed loop is formed between the probe group, the lithium battery and the external power supply, thereby realizing the monitoring and detection of the current and voltage on the lithium battery.

[0030] The plurality of sub-probe groups 3 are arranged around the main probe group 2, so as to facilitate parallel integration of the connection terminals of the current probes 4 on the plurality of sub-probe groups 3.

[0031] The current test connection part 71 and the integration part 74 are integrally formed and arranged perpendicular to each other. The integration part 74 is provided with a plurality of probe insertion holes 73 for the current probes 4 to insert and contact. The middle of the integration part 74 is provided with a make way slot 72 for accommodating the main probe set 2.

[0032] The integrated part 74 is arranged horizontally, and the straight line in the length direction of the current test connection part 71 is parallel to the straight line in the length direction of the voltage probe 5. The end of the current test connection part 71 away from the integrated part 74 is used to connect an external power supply to perform current detection on the lithium battery. There is no need to connect the current test connection ends 8 on the tops of the current probes 4 on the multiple sub-probe groups 3 with leads connected to the external power supply in sequence. It is only necessary to energize the current test part on the connecting piece 7 to realize energizing the current probes 4 on the multiple sub-probe groups 3.

[0033] The arrangement of the give way groove 72 is used to avoid the main probe group 2 arranged on the probe seat 1. The give way groove 72 is located on the integrated part 74 and extends toward the outer edge of the side away from the current test connection part 71. On the one hand, it can facilitate the disassembly of the connecting piece 7, and on the other hand, it can effectively reduce the processing cost of the connecting piece 7.

[0034] The probe seat 1 is provided with a plurality of probe slots for inserting the probe group, the current probe 4 is provided with a first spring 10 at its detection end and the lower surface of the probe seat 1, the middle of the current probe 4 is provided with a receiving slot for inserting the voltage probe 5, and the voltage probe 5 is provided with a second spring 11 at the voltage test connection end 9 and the detection end. The probe seat 1 is used to fix the position of the probe group, and the first spring 10 and the second spring 11 can play a buffering role when the current probe 4 and the voltage probe 5 move downward to contact the lithium battery to be tested.

[0035] In some embodiments, four sub-probe groups 3 are arranged around the main probe group 2 , and one main probe group 2 is arranged.

[0036] The cross-section of the probe seat 1 along its length direction is in a convex shape, and the four sub-probe groups 3 are respectively arranged at the four corners of the upper half of the convex shape, and the main probe group 2 is located in the middle position. A plurality of connecting holes are opened around the lower half of the probe seat 1 to facilitate the connection and fixation of the probe seat 1 with external equipment, thereby facilitating the subsequent testing work of the probe group.

[0037] It should be noted that the number of the sub-probe groups 3 is determined by the number of lithium battery terminals that need to be tested.

[0038] The top of the current probe 4 is a current test connection terminal 8, and the current test connection terminal 8 is threadedly connected to a support nut 13, the lower surface of the support nut 13 is in contact with the upper surface of the probe seat 1, and the integrated portion 74 is placed on the support nut 13, and its upper surface is connected to the locking nut 14 threadedly locked on the top of the current test connection terminal 8 through a protective pad 15. By providing the support nut 13, the current probe 4 can be placed on the probe seat 1, and the connecting piece 7 is sleeved on the current test connection terminal 8 of the current probe 4 on the sub-probe group 3, and is locked and fixed between the support nut 13 and the locking nut 14, which effectively ensures that the connecting piece 7 will not short-circuit during the use of the test probe, and ensures that the connecting piece 7 is always connected to the multiple current probes 4 on the sub-probes, ensuring the stability of current detection.

[0039] By providing the protective pad 15 , it is possible to prevent the connecting piece 7 from being damaged when being locked by the locking nut 14 , thereby effectively ensuring the service life of the connecting piece 7 .

[0040] The sub-probe group 3 also includes a sub-connection component 6, which includes a fixing member 61 and a gasket 62 inserted into the top of the current probe 4 on the sub-probe group 3. The top of the voltage probe 5 on the sub-probe group 3 is provided with an annular groove along its circumference near the voltage test connection terminal 9, and the gasket 62 is clamped in the annular groove, and the lower surface of the gasket 62 is in contact with the upper surface of the fixing member 61. By providing the fixing member 61 and the gasket 62, the voltage probe 5 will not be separated from the receiving groove opened in the middle of the current probe 4, ensuring the coaxial arrangement of the voltage probe 5 and the current probe 4, thereby synchronously realizing the detection and monitoring of current and voltage.

[0041] The fixing member 61 is inserted into the top of the receiving groove on the current probe 4 by interference fit, so as to ensure that the fixing member 61 will not fall off from the current probe 4, thereby ensuring the installation of the voltage probe 5 thereon.

[0042] The main probe group 2 also includes a main connection component 12, which includes a mounting member 121 inserted on the main probe group 2, a through slot for the voltage probe 5 on the main probe group 2 to be inserted and penetrated is provided on the mounting member 121 along its height direction, a through pin insertion hole 124 is provided on the side of the mounting member 121 along the horizontal direction, and a strip slot 123 is provided near the voltage test connection terminal 9 of the voltage probe 5 on the main probe group 2, and the strip slot 123 and the pin insertion hole 124 are connected by a plug 122. The mounting member 121, the plug 122 and the voltage probe 5 on the main probe group 2 cooperate with each other, so that the voltage probe 5 can move up and down inside the current probe 4 on the main probe group 2, and the strip slot 123 vertically provided on the voltage probe 5 matches the pin insertion hole 124, which can effectively limit the moving distance of the voltage probe 5 in the vertical direction, so that it meets the requirements of lithium battery voltage detection.

[0043] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A test probe, characterized in that: It includes a probe group and a connecting piece arranged on a probe seat; the probe group includes a main probe group and multiple sub-probe groups with the same structure, the sub-probe group includes a current probe and a voltage probe located inside and coaxially arranged therein, the connecting piece includes a current test connection part connected to an external power supply and an integrated part, and the current probes on multiple sub-probe groups are located on the integrated part to achieve parallel connection with the external power supply.

2. A test probe according to claim 1, characterized in that: A plurality of the sub-probe groups are arranged around the main probe group.

3. A test probe according to claim 1, characterized in that: The current test connection part and the integrated part are integrally formed and arranged perpendicularly to each other. The integrated part is provided with a plurality of probe jacks for current probes to insert and contact. The middle of the integrated part is provided with a recess for accommodating the main probe group.

4. A test probe according to claim 1, characterized in that: The probe seat is provided with a plurality of probe slots for inserting the probe group, the portion of the current probe located at the detection end and the lower surface of the probe seat is sleeved with a first spring, the middle portion of the current probe is provided with a receiving groove for inserting the voltage probe, and the portion of the voltage probe located at the voltage test connection end and the detection end is sleeved with a second spring.

5. A test probe according to claim 4, characterized in that: The top of the current probe is a current test connection end, and the current test connection end is threadedly connected to a support nut. The lower surface of the support nut abuts against the upper surface of the probe seat. The integrated part is placed on the support nut, and its upper surface is connected to the locking nut threadedly locked to the top of the current test connection end through a protective pad.

6. A test probe according to claim 1, characterized in that: The sub-probe group also includes a sub-connection component, which includes a fixing part and a gasket inserted on the top of the current probe on the sub-probe group. The top of the voltage probe on the sub-probe group is provided with an annular groove along its circumference near the voltage test connection end. The gasket is clamped in the annular groove, and the lower surface of the gasket is in contact with the upper surface of the fixing part.

7. A test probe according to claim 1, characterized in that: The main probe group also includes a main connection component, which includes a mounting piece inserted on the main probe group, a through slot is provided on the mounting piece along its height direction for the voltage probe on the main probe group to insert and pass through, a through pin socket is provided on the side of the mounting piece along the horizontal direction, and a strip slot is provided near the voltage test connection end of the voltage probe on the main probe group, and the strip slot is connected to the pin socket by a pin.

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