Battery internal resistance detection device

Abstract

The utility model provides a battery internal resistance detection device. The battery internal resistance detection device comprises a support and a probe assembly installed on the support. The probe assembly comprises a first probe and a second probe, the first probe is sleeved with the second probe, the first probe and the second probe are in insulation connection, and the first probe can move in the vertical direction relative to the second probe; the first probe and the second probe are both arranged at the first end part of the battery, the first end part is provided with a cover cap and a bending section which are in insulated connection, the cover cap is connected with the first pole of the battery, the bending section is the second pole of the battery, the first probe is used for abutting against the cover cap, the second probe covers the first end part, and the second probe is used for abutting against the bending section. According to the utility model, the problem of low accuracy of the existing battery internal resistance detection device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to a battery internal resistance detection device. Background Art

[0002] During the existing production process of cylindrical lithium-ion batteries, defective products may be produced. For example, batteries with low liquid content and high internal resistance, as well as batteries with folded tab circuits, may flow into subsequent processes, posing a significant safety hazard. Therefore, it is necessary to test the internal resistance of the battery after it is sealed.

[0003] Currently, after lithium-ion batteries are filled, some electrolyte remains in the battery notch. After the capping process, residual electrolyte overflows onto the outside of the battery cell's steel casing, or some electrolyte remains on the battery's outer surface during filling. Upon contact with air, the electrolyte gradually condenses and remains at the bottom of the battery. When using existing battery internal resistance testing devices to measure the battery's internal resistance, residual electrolyte can lead to misjudgments, potentially misclassifying a qualified product as unqualified, and affecting the accuracy of the internal resistance test. Utility Model Content

[0004] The utility model aims to solve the problem of low accuracy of the existing battery internal resistance detection device.

[0005] In order to solve the above problems, the utility model provides a battery internal resistance detection device, comprising: a bracket and a probe assembly mounted on the bracket;

[0006] The probe assembly includes a first probe and a second probe, wherein the second probe is sleeved outside the first probe, the first probe and the second probe are insulated and connected, and the first probe can move in a vertical direction relative to the second probe;

[0007] The first probe and the second probe are both arranged at the first end of the battery, the first end is provided with an insulated cap and a bent section, the cap is connected to the first pole of the battery, the bent section is the second pole of the battery, the first probe is used to abut against the cap, the second probe cover is provided at the first end, and the second probe is used to abut against the bent section, and the polarities of the first pole and the second pole are opposite.

[0008] Furthermore, the second probe has an open hollow cavity, the first probe is accommodated in the hollow cavity, and an insulating elastic member is provided between the first probe and the second probe.

[0009] Furthermore, the second probe includes a second probe and a connecting rod, the connecting rod has a first hollow cavity, the second probe includes an integrally formed cylinder and an end plate, the end plate is arranged at the end of the cylinder away from the battery, the end plate is connected to the connecting rod, the cylinder has an opening at the end close to the battery, the cylinder has a second hollow cavity, the first hollow cavity, the second hollow cavity and the opening are connected to form a hollow cavity with an opening.

[0010] Furthermore, the second probe and the connecting rod are detachably connected.

[0011] Furthermore, the first probe includes a first probe head, a first probe handle, and a second probe handle connected in sequence, the diameter of the first probe handle is larger than the diameter of the first probe head and the second probe handle, the first probe handle and the second probe handle are located in the first hollow cavity, and part of the second probe handle extends to the outside of the first hollow cavity, the first probe extends from the first hollow cavity to the second hollow cavity, and the first probe has multiple conical needle tips.

[0012] Furthermore, the insulating elastic part includes a first insulating elastic part, which is arranged between the second probe handle and the connecting rod, and the second probe handle is covered with a first elastic part. One end of the first elastic part abuts against the first insulating elastic part, and the other end of the first elastic part abuts against the first probe handle.

[0013] Furthermore, the insulating elastic member also includes a second insulating elastic member, which is arranged between the first probe and the second probe, and the second insulating elastic member is located between the first end and the second end of the first probe. The second insulating elastic member can move between the first end and the second end in a vertical direction, the first end is the end of the first probe where the conical needle tip is set, and the second end is the end where the first probe and the first probe handle are connected.

[0014] Furthermore, the first insulating elastic member and the second insulating elastic member are both rubber rings.

[0015] Furthermore, the probe assembly also includes a mounting seat, which is sleeved on the outside of the connecting rod and connected to the bracket. A second elastic member is sleeved on the outside of the connecting rod, one end of the second elastic member abuts against the mounting seat, and the other end of the second elastic member abuts against the end plate.

[0016] Furthermore, a gasket and a locking piece are also sleeved on the outside of the connecting rod, and the gasket and the locking piece are arranged at the end away from the second probe. There is a gap between the gasket and the locking piece, and the locking piece can move relative to the connecting rod and can be locked with the connecting rod.

[0017] The battery internal resistance detection device described in the present invention, by arranging the second probe cover at the first end of the battery and the second probe abutting the bent section, is conducive to increasing the contact area between the second probe and the battery, improving the accuracy of internal resistance detection, and thus reducing the risk of misjudgment due to electrolyte crystallization; and compared with the prior art of arranging the first probe and the second probe at both ends of the battery for internal resistance detection, the present invention arranges the second probe outside the first probe so that the first probe and the second probe are located at the same end of the battery for internal resistance detection, thereby reducing the probability of the first probe and the second probe contacting electrolyte crystallization, which is conducive to further improving the accuracy of internal resistance detection. In addition, the first probe and the second probe are arranged on the same side of the battery in the present invention, which facilitates the connection of the battery internal resistance detection device for online internal resistance detection, and also makes the structure of the battery internal resistance detection device more compact, saving space for the battery internal resistance detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a battery internal resistance detection device provided in an embodiment of the present invention detecting the internal resistance of a battery;

[0019] Figure 2 A partial cross-sectional structural diagram of a battery internal resistance detection device provided in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic cross-sectional structural diagram of the first probe provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described clearly and in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In addition, in the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In this specification, the term "as an alternative embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one alternative embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0023] Combine Figure 1 and Figure 2 As shown, the first aspect of this embodiment provides a battery internal resistance detection device, wherein the battery 30 includes a first end and a second end arranged opposite to each other in a vertical direction. The first end is provided with a cap 31, which is connected to the first pole of the battery 30 and can serve as the lead-out terminal of the first pole. The second end is provided with a second pole, which is bent vertically to the first end to form a bent section 32. The bent section 32 is arranged on the periphery of the cap and is insulated from the cap 31. The first pole and the second pole have opposite polarities. If the first pole can be a positive pole, the second pole can be a negative pole, or if the first pole can be a negative pole, the second pole can be a positive pole. The battery internal resistance detection device is arranged at the first end of the battery 30 for detecting the internal resistance of the battery 30. The battery internal resistance detection device includes a bracket 10 and a probe assembly 20 mounted on the bracket 10, wherein:

[0024] The probe assembly 20 includes a first probe 21 and a second probe 22 arranged coaxially. The second probe 22 is sleeved on the outside of the first probe 21. The first probe 21 and the second probe 22 are insulated and connected. The first probe 21 can move in a vertical direction relative to the second probe 22. The first probe 21 is used to abut against the cap 31 of the battery 30. The second probe 22 is covered at the first end of the battery 30 and is used to abut against the bent section 32. The internal resistance of the battery 30 is detected by the first probe 21 and the second probe 22.

[0025] The battery internal resistance detection device provided in this embodiment, by arranging the second probe cover at the first end of the battery and the second probe abutting the bent section, is conducive to increasing the contact area between the second probe and the battery, improving the accuracy of internal resistance detection, and thus reducing the risk of misjudgment due to electrolyte crystallization; and compared with the prior art of arranging the first probe and the second probe at both ends of the battery for internal resistance detection, this embodiment arranges the second probe outside the first probe so that the first probe and the second probe are located at the same end of the battery for internal resistance detection, thereby reducing the probability of the first probe and the second probe contacting electrolyte crystallization, and is conducive to further improving the accuracy of internal resistance detection. In addition, in this embodiment, the first probe and the second probe are arranged on the same side of the battery, which facilitates the connection of the battery internal resistance detection device for online internal resistance detection, and also makes the structure of the battery internal resistance detection device more compact, saving space for the battery internal resistance detection device.

[0026] Combine Figure 2 As shown, based on the above embodiment, as an optional embodiment, the second probe 22 has an open hollow cavity, the first probe 21 is accommodated in the hollow cavity, and an insulating elastic member is provided between the first probe 21 and the second probe 22, and an insulating connection between the first probe 21 and the second probe 22 is achieved by the insulating elastic member. Specifically, the second probe 22 includes a second probe 221 and a connecting rod 222, the interior hollow of the connecting rod 222 forms a first hollow cavity, the second probe 221 includes an integrally formed cylinder 2211 and an end plate 2212, the end plate 2212 is provided at the end of the cylinder 2211 away from the battery 30, the end of the cylinder 2211 close to the battery 30 has an opening, and the interior hollow of the cylinder 221 forms a second hollow cavity, the first hollow cavity, the second hollow cavity and the opening are connected, so that the second probe 22 forms a hollow cavity with an opening, and the hollow cavity with an opening is used to accommodate the first probe 21. Thus, the first probe 21 is accommodated in the hollow cavity with an opening of the second probe 22, so that the first probe 21 and the second probe 22 can be coaxially arranged and arranged on the same side of the battery 30, making the structure of the battery internal resistance detection device more compact, which is beneficial to saving space of the battery internal resistance detection device.

[0027] It should be noted that the second probe 22 may only cover a portion of the first end of the battery 30 , or the second probe 22 may cover the entire first end of the battery 30 , as long as the second probe 22 can abut against the bent section 32 .

[0028] Based on the above embodiment, as an alternative embodiment, the end plate 2212 is connected to the connecting rod 222, thereby connecting the second probe 221 and the connecting rod 222. The end plate 2212 and the connecting rod 222 are detachably connected, thereby achieving a detachable connection between the second probe 221 and the connecting rod 222. Thus, for batteries 30 of different sizes, internal resistance testing can be performed by replacing different models of second probes 221, thereby expanding the applicability of the battery internal resistance testing device. As an alternative embodiment, the end plate 2212 and the connecting rod 222 can be connected by threads.

[0029] Combine Figure 2 and Figure 3 As shown, based on the above embodiment, as an optional embodiment, the first probe 21 includes a first probe head 211, a first probe handle 212, and a second probe handle 213 connected in sequence. The first probe handle 212 is located between the first probe head 211 and the second probe handle 213, and the diameter of the first probe handle 212 is larger than the diameter of the first probe head 211 and the second probe handle 213, so that a first step structure is formed between the first probe handle 212 and the second probe handle 213, and a second step structure is formed between the first probe handle 212 and the first probe head 211. The first probe handle 212 and the second probe handle 213 are located in the first hollow cavity, and a portion of the second probe handle 213 extends outside the first hollow cavity. The second probe handle 213 enables the first probe 211 to abut against the cap 31. The first probe 211 extends from the first hollow cavity to the second hollow cavity and has multiple tapered needle tips, which abut against the cap 31 of the battery 30.

[0030] Based on the above embodiment, as an optional implementation, the insulating elastic member includes a first insulating elastic member 23 and a second insulating elastic member 24. The first insulating elastic member 23 is disposed between the second probe handle 213 and the connecting rod 222. The inner holes of the second probe handle 213 and the first insulating elastic member 23 are clearance fits, while the outer rings of the connecting rod 222 and the first insulating elastic member 23 are interference fits. The first probe handle 212, the second probe handle 213, the inner wall of the connecting rod 222, and the first insulating elastic member 23 form a first receiving groove. The second insulating elastic member 24 is disposed between the first probe 211 and the second probe 221. The inner holes of the first probe 211 and the second insulating elastic member 24 are clearance fits, while the outer rings of the second probe 221 and the second insulating elastic member 24 are interference fits. The first probe handle 212, the first probe 211, the inner wall of the connecting rod 222, and the second insulating elastic member 24 form a second receiving groove. Thus, by providing the first insulating elastic member 23 and the second insulating elastic member 24 to isolate the first probe 21 and the second probe 22, not only can the first probe 21 and the second probe 22 operate independently of each other, preventing the two probes from contacting each other during operation and causing a short circuit, but the two insulating elastic members can also improve the stability of the first probe 21 moving vertically relative to the second probe 22. As an optional embodiment, the first insulating elastic member 23 and the second insulating elastic member 24 can be made of rubber rings.

[0031] In an alternative embodiment, based on the above embodiment, a first elastic member 25 is sheathed around the exterior of the second probe handle 213. The first elastic member 25 is housed within the first receiving groove, with one end of the first elastic member 25 abutting the first insulating elastic member 23, and the other end of the first elastic member 25 abutting the first probe handle 212. This creates a flexible connection between the first probe 21 and the second probe 22, enabling vertical movement of the first probe 21 relative to the second probe 22. The first elastic member 25 also provides a buffer during vertical movement of the first probe 21, preventing damage to the smaller-diameter first probe 21 from overpressure. Alternatively, the first elastic member 25 can be a compression spring.

[0032] Based on the above embodiment, as an optional implementation, the second insulating elastic member 24 is located between the first end of the first probe 211 and the second end of the first probe 211, and the second insulating elastic member 24 can move in the vertical direction. The second receiving groove provides space for the second insulating elastic member 24 to move in the vertical direction, wherein the first end is the end of the first probe 211 provided with the tapered needle tip, and the second end is the end where the first probe 211 and the first probe handle 212 are connected. Thus, the second insulating elastic member 24 is located in the middle of the first probe 211 and can move in the vertical direction between the first end and the second end. The second insulating elastic member 24 can act as a limiter. By adjusting the position of the second insulating elastic member 24 in the second receiving groove, the relative distance between the first probe 211 and the second probe 221 can be adjusted, thereby ensuring that the first probe 211 and the second probe 221 can always maintain stable contact with the first end of the battery 30.

[0033] Based on the above embodiment, as an optional implementation, the probe assembly 20 further includes a mounting seat 26, which is sleeved on the exterior of the connecting rod 222 and connected to the bracket 10, thereby connecting the probe assembly 20 and the bracket 10. A second elastic member 27 is sleeved on the exterior of the connecting rod 222, one end of the second elastic member 27 abutting the mounting seat 26, and the other end of the second elastic member 27 abutting the end plate 2212. Thus, by providing the second elastic member 27, the height of the second probe 221 in the vertical direction can be adjusted. As an optional implementation, the second elastic member 27 can be a compression spring.

[0034] Based on the above embodiment, as an optional embodiment, the outside of the connecting rod 222 is further provided with a gasket 28 and a locking member 29. Both the gasket 28 and the locking member 29 are provided at the end of the connecting rod 222 away from the second probe 221. A gap is provided between the gasket 28 and the locking member 29, and the locking member 29 can move relative to the connecting rod 222 and can be locked with the connecting rod 222. Specifically, the locking member 29 can move along the connecting rod 222 to a locked position. The locking member 29 can be provided with a threaded hole. A threaded member can be inserted into the threaded hole to lock the locking member 29 with the connecting rod 222. Therefore, when the locking member 29 moves relative to the connecting rod 222, the gap between the gasket 28 and the locking member 29 can be adjusted. The gap between the gasket 28 and the locking member 29 is used to accommodate a test line. After the test line is connected, the test line is fixed by the gasket 28 and the locking member 29. Therefore, by providing a gap between the gasket 28 and the locking member 29 , the battery internal resistance detection device can be directly connected to the test line, which is more convenient and has shorter wiring.

[0035] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A battery internal resistance detection device, characterized in that: include: a bracket and a probe assembly mounted on the bracket; The probe assembly includes a first probe and a second probe, wherein the second probe is sleeved outside the first probe, the first probe and the second probe are insulated and connected, and the first probe can move in a vertical direction relative to the second probe; The first probe and the second probe are both arranged at the first end of the battery, the first end is provided with an insulated cap and a bent section, the cap is connected to the first pole of the battery, the bent section is the second pole of the battery, the first probe is used to abut against the cap, the second probe cover is provided at the first end, and the second probe is used to abut against the bent section, and the polarities of the first pole and the second pole are opposite.

2. The battery internal resistance detection device according to claim 1, characterized in that: The second probe has an open hollow cavity, the first probe is accommodated in the hollow cavity, and an insulating elastic member is provided between the first probe and the second probe.

3. The battery internal resistance detection device according to claim 2, characterized in that: The second probe includes a second probe and a connecting rod, the connecting rod has a first hollow cavity, the second probe includes an integrally formed cylinder and an end plate, the end plate is arranged at the end of the cylinder away from the battery, the end plate is connected to the connecting rod, the cylinder has an opening at the end close to the battery, the cylinder has a second hollow cavity, the first hollow cavity, the second hollow cavity and the opening are connected to form a hollow cavity with an opening.

4. The battery internal resistance detection device according to claim 3, characterized in that: The second probe and the connecting rod are detachably connected.

5. The battery internal resistance detection device according to claim 3, characterized in that: The first probe includes a first probe head, a first probe handle, and a second probe handle connected in sequence. The diameter of the first probe handle is larger than the diameter of the first probe head and the second probe handle. The first probe handle and the second probe handle are located in the first hollow cavity, and a portion of the second probe handle extends to the outside of the first hollow cavity. The first probe extends from the first hollow cavity to the second hollow cavity, and the first probe has multiple tapered needle tips.

6. The battery internal resistance detection device according to claim 5, characterized in that: The insulating elastic member includes a first insulating elastic member, which is arranged between the second probe handle and the connecting rod, and the first elastic member is sleeved on the outside of the second probe handle. One end of the first elastic member abuts against the first insulating elastic member, and the other end of the first elastic member abuts against the first probe handle.

7. The battery internal resistance detection device according to claim 6, characterized in that: The insulating elastic member also includes a second insulating elastic member, which is arranged between the first probe and the second probe, and the second insulating elastic member is located between the first end and the second end of the first probe. The second insulating elastic member can move between the first end and the second end in a vertical direction, the first end is the end of the first probe where the conical needle tip is set, and the second end is the end where the first probe and the first probe handle are connected.

8. The battery internal resistance detection device according to claim 7, characterized in that: The first insulating elastic member and the second insulating elastic member are both rubber rings.

9. The battery internal resistance detection device according to claim 3, characterized in that: The probe assembly also includes a mounting seat, which is sleeved on the outside of the connecting rod and connected to the bracket. A second elastic member is sleeved on the outside of the connecting rod, one end of the second elastic member abuts the mounting seat, and the other end of the second elastic member abuts the end plate.

10. The battery internal resistance detection device according to claim 9, characterized in that: The outside of the connecting rod is also provided with a gasket and a locking piece, and the gasket and the locking piece are arranged at the end away from the second probe. There is a gap between the gasket and the locking piece, and the locking piece can move relative to the connecting rod and can be locked with the connecting rod.

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