CN-121596134-B - Multi-point synchronous detection structure of battery current probe and rapid detection method thereof

CN121596134BCN 121596134 BCN121596134 BCN 121596134BCN-121596134-B

Abstract

The invention relates to a multi-point synchronous detection structure of a battery current probe and a rapid test method thereof, belonging to the technical field of battery current probe detection, wherein two current probes respectively correspond to a first current connecting terminal and a second current connecting terminal, the two terminals are electrically isolated, the current probes are in axial movable fit with a probe fixing part and are elastically pressed by an elastic part, so that the pressing process has stroke compensation capability, the axial through holes of the current probes and the voltage probe combining part are integrally arranged, voltage sampling can be integrally arranged with a heavy current probe, a stable sampling channel is established under the same pressing action, sampling errors caused by pressure drop and connection state change of a heavy current lead are reduced, and the problems of fluctuation of contact resistance, easiness in heating and poor suitability caused by single connecting interface of the existing single-stud heavy current probe in hundreds of ampere battery tests are solved by the arrangement of a temperature measuring part, and the voltage sampling and the temperature acquisition of a contact area are difficult to be contacted under one-time pressing.

Inventors

LIU XIAOHONG
LAN JIE
YU RONGFENG
Ning Zhenjin

Assignees

广州江侨电子设备有限公司

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (8)

1. The utility model provides a battery current probe multiple spot synchronous detection structure which is characterized in that, including probe fixed part, two electric current needles, two elastic part, voltage needle combination part, temperature measurement portion and connecting portion, be provided with two installation through-holes that run through along fore-and-aft direction on the probe fixed part, two electric current needles respectively wear to locate in corresponding installation through-holes and form the relative movable cooperation along installation through-hole axis direction with the probe fixed part, the front end of electric current needle is equipped with the contact terminal surface that is used for with the battery contact surface, and the electric current needle is solid structure; The elastic part is arranged between the current pins and the probe fixing part, the voltage pin combination part is arranged on the probe fixing part outside the current pins, the temperature measuring part is arranged at the front end of the probe fixing part and adjacent to the contact end face, the connecting part is of a double-stud structure, the double-stud structure is fixedly connected to the rear ends of the two current pins, the connecting part comprises a first current connecting terminal and a second current connecting terminal, and the first current connecting terminal and the second current connecting terminal are protruded backwards along the direction parallel to the axes of the current pins, are electrically isolated from each other and are respectively connected with the two current pins in a conductive manner; The double-stud structure comprises a mounting plate, a first stud and a second stud which are respectively arranged on the mounting plate, wherein the first stud and the second stud respectively form a first current connecting terminal and a second current connecting terminal and are respectively connected with the rear ends of two current pins in a conductive manner; the voltage needle combination part comprises a voltage needle which penetrates through the probe fixing part at the outer side of one of the current needles and is eccentrically arranged relative to the axis of the current needle, and the front end of the voltage needle combination part extends out to form a T-shaped contact.
2. The multi-point synchronous detection structure of a battery current probe according to claim 1, wherein the number of the mounting through holes is two, the two mounting through holes are arranged on the probe fixing part at intervals, the axes of the two mounting through holes are parallel to each other, and the contact end face of the current probe is of a tooth end structure.
3. The structure according to claim 1, wherein a temperature sleeve is provided at the front end of the probe fixing part, a thermistor is installed in the temperature sleeve, and a temperature sensing end of the thermistor is disposed adjacent to the contact end face of the current needle.
4. The multi-point synchronous detection structure of a battery current probe according to claim 1, wherein the elastic portion is a spiral spring, the spiral spring is sleeved on the periphery of the current needle, one end of the spiral spring is abutted against a fixing ring of the current needle, and the other end of the spiral spring is abutted against the inner wall of the probe fixing portion.
5. A rapid test method for a multi-point synchronous detection structure of a battery current probe, based on the multi-point synchronous detection structure of a battery current probe according to any one of claims 1 to 4, characterized by comprising the following steps: s1, connecting a current lead of a test power supply to at least one of a first current connecting terminal and a second current connecting terminal according to a target test current level, connecting a voltage sampling lead with a voltage pin, and connecting a temperature collecting lead with a temperature measuring part; s2, aligning the probe fixing part with the contact surface of the battery to be tested and applying an axial pressure force, so that the two current pins are respectively pressed on the contact surface under the action of the elastic part, and simultaneously, the T-shaped contact head of the voltage pin is contacted with the contact surface to form voltage sampling contact; S3, applying pre-detection current under the state of keeping pressure connection, and synchronously collecting a current value, a voltage value obtained by a voltage needle and a temperature value obtained by a temperature measuring part; S4, calculating contact voltage drop or equivalent contact resistance based on synchronously collected current values and voltage values, and judging a crimping contact state by combining a temperature value; S5, when the compression joint contact state meets the preset condition, applying a target test current, executing at least one test of formation, capacity division, internal resistance evaluation and process consistency detection, and simultaneously keeping synchronous acquisition of voltage and temperature; and S6, releasing the crimping force after the test is finished and recording synchronously collected data.
6. The method for rapidly testing the multi-point synchronous detection structure of the battery current probe according to claim 5, wherein in the step S1, when the target test current is larger than a preset threshold value, the first current connection terminal and the second current connection terminal are simultaneously connected so as to shunt the two current pins in parallel, and when the target test current is not larger than the preset threshold value, only one of the first current connection terminal and the second current connection terminal is connected.
7. The method according to claim 5, wherein when the voltage pin assembly includes a voltage pin, the voltage value of the voltage pin is collected as the battery terminal voltage in step S3, and the stability of the voltage value or whether the voltage value falls within a preset range is used as a criterion for the effectiveness of voltage sampling contact.
8. The rapid test method of a multi-point synchronous detection structure of a battery current probe according to claim 5, wherein in step S4, an absolute value of a temperature value is compared with a preset threshold value, and a temperature rise value per unit time is compared with the preset threshold value as a judgment condition of a press-contact state, and when any one of the comparison results does not satisfy the preset condition, current application is stopped and an abnormality prompt is output before step S5.

Description

Multi-point synchronous detection structure of battery current probe and rapid detection method thereof Technical Field The invention belongs to the technical field of battery current probe detection, and particularly relates to a battery current probe multipoint synchronous detection structure and a rapid detection method thereof. Background In the scenes of formation, capacity division, internal resistance evaluation, process consistency detection and the like of a lithium ion power battery, test equipment is generally required to be reliably and electrically connected with battery lugs, terminals and buses through a probe device so as to complete operations such as construction of a high-current charge-discharge loop, sampling of terminal voltage and the like. The conventional heavy current probe common structure comprises an insulated probe fixing piece serving as a mounting substrate, a current needle which is a columnar piece with an axial through hole, a contact end face contacted with a battery lug, and a nut assembly matched with a threaded section at the rear end of the current needle to realize compression connection of a lead terminal, wherein a voltage needle is inserted into the axial through hole of the current needle, a needle-shaped contact structure is formed at the front end of the voltage needle, a wiring terminal is formed at the rear end of the voltage needle, and a spring is matched to provide elastic buffering for the axial compression connection process of the current needle or the voltage needle, for example, the structure disclosed in patent with publication number CN208636359U belongs to the typical scheme, wherein the threaded section of the current needle is used as a single current wiring terminal, and the lead terminal is clamped through the nut assembly. However, when the above structure is applied to a higher current level, for example, hundreds of ampere levels, and a test condition requiring a higher beat and higher consistency, the prior art will reveal several limitations derived from structural features, namely, firstly, since the current terminals are usually single threaded ends/single compression interfaces, the test current is totally led into the same wire terminal crimping area and single threaded connection path, and is limited by factors such as contact area, discrete compression force, thread engagement state and terminal surface state, and the equivalent contact resistance at the connection is difficult to control stably; under the condition of large current, tiny fluctuation of contact resistance is amplified into remarkable heat according to the square relation of current, temperature rise further causes material resistance change, surface oxidation aggravation and pretightening force attenuation, the accumulated effect of temperature rise-resistance increase-larger temperature rise is formed, further risks of voltage drop drift, repeatability worsening, even local overheating and the like are caused, the existing probes depend on torque assembly or post electrical parameter judgment, contact state degradation is difficult to discover in time, secondly, in the face of adapting requirements of different current grades, different cable specifications or different equipment terminals, single terminal forms often force the site to meet the requirements of current carrying and temperature rise through cable replacement or whole probe replacement or reassembly, so that the change of shape maintenance steps are more, beat is influenced and artificial assembling difference is introduced, meanwhile, the existing voltage pins are arranged along the axis of the current pins, the positions of the contact points are relatively fixed, when the contact surfaces of the batteries have steps, grooves, flanges, narrow gaps or asymmetric structures, the voltage contact points can be interfered to cause unstable contact or the contact positions deviate from expected contact positions, in the scene of carrying out consistency acquisition on a plurality of signal points under the same crimping action, the existing structure often needs to additionally arrange other sensing/sampling elements or adopts polling switching, thereby further bringing about the problems of structural complexity and time sequence consistency. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a multi-point synchronous detection structure of a battery current probe and a rapid detection method thereof, which solve the problems that the contact resistance is fluctuated, the heating is easy to occur and the suitability is poor due to the single connecting interface of the traditional single-stud high-current probe in hundreds of ampere-level battery tests, and the voltage sampling and the contact area temperature acquisition of multi-point contact are difficult to be considered under one-time crimping. The aim of the invention can be achieved by the following tech