CN111505351B

CN111505351B - Battery tab clamp

Info

Publication number: CN111505351B
Application number: CN202010455832.8A
Authority: CN
Inventors: 吴月; 范佳臻; 田秀君; 李敏
Original assignee: Hunan Lingpai Energy Storage Technology Co ltd; Hunan Lingpai New Energy Research Institute Co ltd; Hunan Lingpai New Energy Technology Co Ltd; Hengyang Lingpai New Energy Technology Co Ltd; Hunan Lead Power Dazhi Technology Inc
Current assignee: Hunan Lingpai Energy Storage Technology Co ltd; Hunan Lingpai New Energy Research Institute Co ltd; Hunan Lingpai New Energy Technology Co Ltd; Hengyang Lingpai New Energy Technology Co Ltd; Hunan Lead Power Dazhi Technology Inc
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2023-08-15
Anticipated expiration: 2040-05-26
Also published as: CN111505351A

Abstract

The application provides a battery tab clamp, comprising: two clamping plates with conductive surfaces, two rollers and a fixed structural member; one ends of the two clamping plates are arranged in the fixed structural member, the conductive surfaces of the two clamping plates are parallel, and a crack is formed between the two conductive surfaces; the two rollers are respectively arranged at the other ends of the two clamping plates. The battery tab clamp provided by the application realizes the surface-to-surface contact of the battery tab and the clamp, effectively reduces the contact resistance, reduces the heat generation under the high-rate test condition, and reduces the errors of rate current measurement and temperature measurement.

Description

Battery tab clamp

Technical Field

The application relates to the field of lithium ion battery testing, in particular to a tab clamp of a lithium ion battery.

Background

Common products with high power requirements such as wireless handheld tools, remote control airplanes, automobiles, portable electric appliances and the like are nickel-cadmium batteries or lead-acid batteries, and the nickel-chromium batteries and the lead-acid batteries are replaced by lithium ion batteries with good safety performance and environmental friendliness for realizing environmental protection.

Lithium ion batteries not only have high energy density, but also have higher power performance so that they gradually occupy the power market of high-power products. The power requirement of the start-stop power supply on the battery is about 40 ℃, and the instantaneous power is about 3 ℃ when the common pure electric automobile is started. In order to test whether the rate performance of the battery meets the use requirement, the rate performance of the finished battery core needs to be tested, a large-current charge-discharge method is generally adopted for testing, and the maximum allowable charge/discharge current is tested and the temperature rise is recorded. The prior art adopts crocodile clamps when performance test is carried out, the clamps are of a zigzag contact structure, point contact or line contact is carried out between the clamps and the lugs, current is mainly conducted through contact parts, the contact points are limited, contact resistance is further caused to be large, a multiplying power test result is deviated, and temperature rise of the battery lugs cannot be tested.

Disclosure of Invention

The application aims to solve the technical problem that the contact resistance of the tab clamp for the performance test of the existing lithium ion battery is larger, so that the battery multiplying power test result is deviated.

In order to solve the technical problems, the application discloses a battery tab clamp, which comprises: two clamping plates with conductive surfaces, two rollers and a fixed structural member; one ends of the two clamping plates are arranged in the fixed structural member, the conductive surfaces of the two clamping plates are parallel, and a crack is formed between the two conductive surfaces; the two rollers are respectively arranged at the other ends of the two clamping plates.

Optionally, the battery tab fixture further includes a conductive coating covering other surfaces of the clamping plate and a portion of the roller, and the clamping plate is mounted in the fixing structure through the conductive coating.

Optionally, the battery tab fixture further includes an elastic member disposed in the conductive coating and connected to the roller.

Optionally, the battery tab clamp further includes an elastic member disposed in the conductive coating and connected to the clamping plate.

Optionally, the battery tab fixture further includes a temperature sensor disposed in the clamping plate.

Optionally, the thickness of the clamping plate is 3 mm-5 mm.

Optionally, the splint is made of metal alloy.

Optionally, the conductive coating is made of a metal conductive material.

Optionally, the roller is made of stainless steel, hard metal alloy, ceramic or polytetrafluoroethylene.

Optionally, the fixing structure is made of stainless steel, hard metal alloy, ceramic or polytetrafluoroethylene.

Compared with the prior art, the technical scheme of the application has at least the following beneficial effects:

the battery tab clamp comprises two clamping plates, wherein the conductive surfaces of the two clamping plates are parallel, and a crack is formed between the two conductive surfaces and is suitable for clamping the tab. Therefore, compared with the traditional crocodile type tab clamp, the battery tab clamp disclosed by the application has the advantages that the surface-to-surface contact between the battery tab and the clamp is realized, the contact resistance is effectively reduced, the heat generation under the high-rate test condition is reduced, and the errors of rate current measurement and temperature measurement are reduced.

Compared with the currently used gasket type/conducting strip type battery tab clamp, the battery tab clamp can integrate a test clamp and a temperature sensor, can be internally provided with the temperature sensor on the upper clamping plate and the lower clamping plate of the clamp, simplifies the complicated process during test and reduces human errors.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a battery tab clamp according to an embodiment of the present application.

The following supplementary explanation is given to the accompanying drawings:

1-clamping plates; 10-conductive coating; 2-a roller; 3-fixing the structural member; 4-clamping gaps; 5. 6-elastic member.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

Based on the problems in the prior art, the battery tab clamp provided by the application adopts a mode of contacting with the tab surface to reduce contact resistance and test errors. Referring to fig. 1, a battery tab fixture according to an embodiment of the present application includes: two clamping plates 1 with conductive surfaces, two rollers 2, and a fixed structural member 3; wherein, one end of the two clamping plates 1 is arranged in the fixed structural member 3, the conductive surfaces of the two clamping plates 1 are parallel, and a crack 4 is arranged between the two conductive surfaces; the two rollers 2 are respectively arranged at the other ends of the two clamping plates 1.

In this embodiment, two clamping plates 1 are installed in parallel to the fixing structure 3 to form upper and lower parallel clamping plates, and in particular, the battery tab clamp may further include a conductive coating 10 covering other surfaces (surfaces other than the conductive surface) of the clamping plates 1 and a part of the roller 2, and the clamping plates 1 are installed in the fixing structure 3 through the conductive coating 10. The conductive coating 10 has a protective effect on the clamping plate 1 and can make the clamping plate 1 more firmly and parallelly installed in the fixed structural member 3. In other embodiments, the conductive coating 10 may not be required, and one end of the clamping plate 1 may be directly mounted in the fixed structure 3.

The fixing structure 3 may comprise a fastener which fastens the two parallel clamping plates 1 covered by the conductive coating 10 so that they remain parallel. The conductive surfaces of the clamping plates 1 are opposite, and a clamping gap 4 is reserved between the conductive surfaces, and the clamping gap 4 is used for clamping the pole lugs. The gap (i.e. the gap 4) between the two conductive surfaces is adapted to the thickness of the tab. The two rollers 2 are respectively arranged in the conductive coating 10 and are positioned at the other ends of the two clamping plates 1, and part of the surfaces of the rollers 2 are exposed out of the conductive coating 10. The lugs are contacted with the exposed surfaces of the two rollers 2 when being inserted into the gaps 4 between the clamping plates 1, and the lugs are easier to be inserted between the clamping plates 1 by the rolling pushing of the rollers 2. In other embodiments, the rollers 2 may be disposed outside the conductive coating 10, and a gap is also formed between the two rollers 2, so that the tab contacts the two rollers 2 when inserted into the gap.

Further, the battery tab fixture may further include an elastic member 5 disposed in the conductive coating 10 and connected to the roller 2, for example, a spring may be disposed between the inner wall of the conductive coating 10 and the roller 2, and a center connecting line of the two springs passes through the center of the roller 2. The elastic piece 5 can enable a certain contraction and expansion allowance to exist in a gap between the two rollers 2, and the elastic piece is matched with the rollers 2 to play a role of conveying the lugs, and meanwhile damage to the surfaces of the lugs caused by direct insertion is reduced. When the tab starts to be inserted, the tab contacts with the rollers 2, and the gap between the two rollers 2 is slightly enlarged due to the action of the elastic piece 5, so that the tab is easier to be inserted; after the tab is inserted into the gap 4 between the clamping plates 1, the gap between the two rollers 2 is contracted due to the action of the elastic member 5, so that the clamping plates 1 can clamp the tab, thereby realizing sufficient surface-to-surface contact between the tab and the conductive surface of the clamping plates 1. In addition, an elastic member having a similar function to the elastic member 5 may be provided in the conductive coating 10, and the elastic member 6 provided in the conductive coating 10 and connected to the clamping plate 1 as shown in the drawing may be provided, for example, with a spring between the inner wall of the conductive coating 10 and the clamping plate 1.

Further, the battery tab clamp of the present embodiment may further include a temperature sensor (not shown in the drawings) provided in the clamping plate 1. A temperature sensor can be built in each of the two clamping plates 1 (upper and lower parallel clamping plates) for monitoring the temperature change of the tab during the test, thereby obtaining the battery tab temperature rise during the test.

In this embodiment, in order to ensure good conductivity, the thickness of the clamping plate 1 is 3mm to 5mm, and the surface area of the clamping plate 1 is adapted to the surface area of the tab, so as to obtain a large contact area. The material of the clamping plate 1 can be metal alloy with good electric conductivity, such as copper alloy, aluminum alloy, nickel alloy and the like. The conductive coating 10 may be made of a metal conductive material, such as gold plating, silver plating, etc. on the surface of the alloy plate. The roller 2 is made of stainless steel, hard metal alloy, ceramic or polytetrafluoroethylene. The fixing structure 3 may be made of stainless steel, hard metal alloy, ceramic, polytetrafluoroethylene, or the like. The roller 2 and the fixed structural member 3 have the characteristics of wear resistance and difficult deformation, and can keep the clamping force between the two clamping plates for a long time so as to avoid the increase of the test internal resistance caused by too small clamping force and the untight contact between the polar lugs and the clamping plates and the generation of test result deviation.

In a specific example, the upper and lower parallel clamping plates 1 of the battery tab clamp are made of copper alloy, and the thickness of the upper and lower parallel clamping plates 1 is 3mm; the built-in roller 2 and the fixed structural member 3 are made of polytetrafluoroethylene materials. The battery to be tested is a 48V lithium iron phosphate system battery for a start-stop power supply, the test charge/discharge current is 40 ℃, and an external thermistor is adopted for temperature acquisition; the crocodile clips were also used as a control for testing under the same conditions. The test results are: adopting crocodile clips for testing, wherein the rate charging constant current charging ratio is 90%, and the rate discharging temperature rise is 27 ℃; the tab clamp is adopted for testing, the multiplying power charging constant current charging ratio is 95%, and the multiplying power discharging temperature rise is 25 ℃. Therefore, the battery tab clamp of the embodiment can be fully contacted with the tab, so that the internal resistance generated by an external circuit during the multiplying power test is reduced, the constant current charging proportion is increased, the heat generation is reduced, and the temperature rise is reduced.

The application provides a tab clamp suitable for testing the performance of a high-power battery, which can be suitable for square and soft-package batteries. Compared with the traditional crocodile clamp, the battery tab clamp can realize surface-to-surface contact with the tab, has larger contact area, adopts metal alloy as the clamp material, and reduces the error of a multiplying power test result caused by internal resistance of an external circuit in the charging and discharging process; in addition, compared with the gasket type/conducting strip type battery tab clamp, the battery tab clamp is simple to operate, and human errors are reduced.

In view of the foregoing, it will be evident to a person skilled in the art that the foregoing detailed disclosure may be presented by way of example only and may not be limiting. Although not explicitly described herein, those skilled in the art will appreciate that the present application is intended to embrace a variety of reasonable alterations, improvements and modifications to the embodiments. Such alterations, improvements, and modifications are intended to be proposed by this disclosure, and are intended to be within the spirit and scope of the exemplary embodiments of this disclosure.

Furthermore, certain terms in the present disclosure have been used to describe embodiments of the present disclosure. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. Thus, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the disclosure.

It should be appreciated that in the foregoing description of embodiments of the disclosure, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure. Alternatively, the application may be practiced where various features are dispersed throughout a plurality of embodiments of the application. However, this is not to say that a combination of these features is necessary, and it is entirely possible for a person skilled in the art to extract some of them as separate embodiments to understand them when reading this application. That is, embodiments of the present application may also be understood as an integration of multiple secondary embodiments. While each secondary embodiment is satisfied by less than all of the features of a single foregoing disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in some instances by the term "about," approximately, "or" substantially. For example, unless otherwise indicated, "about," "approximately," or "substantially" may mean a change in a value of ±20% of what it describes. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.

Each patent, patent application, publication of patent application, and other materials, such as articles, books, specifications, publications, documents, articles, etc., cited herein are hereby incorporated by reference. The entire contents for all purposes, except for any prosecution file history associated therewith, may be any identical prosecution file history inconsistent or conflicting with this file, or any identical prosecution file history which may have a limiting influence on the broadest scope of the claims. Now or later in association with this document. For example, if there is any inconsistency or conflict between the description, definition, and/or use of terms associated with any of the incorporated materials, the terms in the present document shall prevail.

Finally, it is to be understood that the embodiments of the application disclosed herein are illustrative of the principles of embodiments of the present application. Other modified embodiments are also within the scope of the application. Accordingly, the disclosed embodiments are illustrative only and not limiting. Those skilled in the art can adopt alternative configurations to implement the application of the present application according to embodiments of the present application. Thus, embodiments of the application are not limited to what has been described in the application precisely.

Claims

1. A battery tab clamp, comprising: two clamping plates with conductive surfaces, two rollers and a fixed structural member; wherein, the liquid crystal display device comprises a liquid crystal display device,

one ends of the two clamping plates are arranged in the fixed structural member, the conductive surfaces of the two clamping plates are relatively parallel, and a crack is formed between the two conductive surfaces; the two rollers are respectively arranged at the other ends of the two clamping plates;

the conductive coating coats other surfaces of the clamping plates and part of the rollers, and the clamping plates are arranged in the fixed structural part through the conductive coating;

an elastic piece connected with the roller and an elastic piece connected with the clamping plate are arranged in the conductive coating.

2. The battery tab clamp of claim 1, further comprising a temperature sensor disposed in the clamping plate.

3. The battery tab clamp of claim 1, wherein the clamping plate has a thickness of 3mm to 5mm.

4. The battery tab clamp of claim 1, wherein the clamping plate is a metal alloy.

5. The battery tab clamp of claim 1, wherein the conductive coating is a metallic conductive material.

6. The battery tab clamp of claim 1, wherein the roller is made of stainless steel, a hard metal alloy, ceramic or polytetrafluoroethylene.

7. The battery tab clamp of claim 1, wherein the fixing structure is made of stainless steel, a hard metal alloy, ceramic or polytetrafluoroethylene.