CN220829541U - Testing device for battery - Google Patents

Abstract

The utility model relates to the technical field of battery testing, in particular to a battery testing device. The testing device of the battery comprises a mounting frame, a first detection mechanism, a second detection mechanism and a detection instrument, wherein the first detection mechanism comprises a first driving piece and a conductive connecting piece, the first driving piece is arranged on the mounting frame and used for driving the conductive connecting piece to be close to or far away from a lug of the battery to be tested, the second driving piece comprises a second driving piece and a conductive piece, the second driving piece is used for driving the conductive piece to be close to or far away from an aluminum-plastic film of the battery to be tested, the conductive piece can pierce the aluminum-plastic film to be connected with an aluminum layer of the aluminum-plastic film, and the detection instrument is used for detecting edge voltage and/or edge resistance of the battery to be tested. The accuracy, reliability and stability of the battery side voltage test are improved, the efficiency of battery side voltage detection is greatly improved, the labor cost is reduced, and the error rate of manual measurement is avoided to a great extent.

Description

Testing device for battery

Technical Field

The utility model relates to the technical field of battery testing, in particular to a battery testing device.

Background

The lithium ion battery is used as a secondary rechargeable battery and can be divided into a cylinder, a square and a soft package battery according to the appearance structure of the package; the soft-package lithium ion battery is widely applied to digital, mobile phones, mobile energy sources, wearable equipment and electric automobiles by virtue of the advantages of large capacity, light weight, small internal resistance, flexible design, high safety performance and the like.

The aluminum plastic film is a special packaging material for lithium ion battery cells and is commonly used in soft package battery cells and blade battery cells. Mainly plays roles of protecting the internal electrode and isolating the external environment. The aluminum plastic film is a high-strength and high-barrier multilayer composite structure composed of various plastics, aluminum foils and adhesives. Has high barrier property, good cold stamping forming property, puncture resistance, electrolyte resistance stability and insulativity.

When the battery cell is subjected to aluminum plastic film soft package, sometimes a PP (Polypropylene) layer of an inner layer of the aluminum plastic film is locally damaged, so that local conduction occurs between the PP layer and the Polypropylene layer, the battery cell can be corroded and leaked in the use process, and the whole battery cell is scrapped. To prevent the cell with the side voltage from flowing into the market, it is often detected when the cell leaves the factory.

And testing the voltage between the tab and the aluminum plastic film, namely testing the edge voltage. At present, for the test of the edge voltage, the positive and negative line contacts of a universal meter are usually used manually to be respectively contacted with the electrode lugs of the battery cells and the aluminum layer in the middle of the aluminum plastic film, so that the edge voltage test is implemented on the soft package battery. The manual side voltage test is performed manually, so that the problems of false detection or missing detection and the like are easy to occur, the side voltage test precision is not accurate enough, and the detection efficiency is too low.

Therefore, there is a need for a battery testing device to solve the above problems.

Disclosure of utility model

The utility model aims to provide a testing device for a battery, which improves the accuracy, reliability and stability of the battery side voltage test, greatly improves the efficiency of battery side voltage detection, reduces the labor cost and avoids the error rate of manual measurement to a great extent.

In order to achieve the above object, the following technical scheme is provided:

A test device for a battery, comprising:

A mounting frame;

The first detection mechanism comprises a first driving piece and a conductive connecting piece, wherein the first driving piece is arranged on the mounting frame and is configured to drive the conductive connecting piece to be close to or far away from a lug of a battery to be detected;

The second detection mechanism comprises a second driving piece and a conductive piece, wherein the second driving piece is configured to drive the conductive piece to be close to or far away from the aluminum-plastic film of the battery to be detected, and the conductive piece can penetrate through the aluminum-plastic film to be connected with an aluminum layer of the aluminum-plastic film;

And the detecting instrument is configured to detect the side voltage of the battery to be detected.

Preferably, the battery testing device further includes:

The positioning mechanism comprises two positioning pieces, wherein the two positioning pieces are oppositely arranged and are abutted against two side edges of the battery to be tested.

Preferably, the distance between the two positioning pieces is adjustable.

Preferably, the positioning mechanism further comprises a third driving piece, an output end of the third driving piece is fixed with at least one positioning piece, and the third driving piece can drive the two positioning pieces to be close to or far away from each other.

Preferably, the battery testing device further includes:

The ejection mechanism is configured to drive the battery to be tested to switch between the loading and unloading station and the testing station.

Preferably, the battery to be measured is a folded soft package battery.

Preferably, the battery testing device further includes:

The guide mechanism comprises a guide rod and a guide piece, wherein the first driving piece is connected with the conductive connecting piece through the guide piece, the guide rod extends along the preset direction and is arranged on the mounting frame, and the guide piece is in sliding connection with the guide rod.

Preferably, the battery testing device further includes:

the guide mechanism comprises a guide rail and a sliding block, wherein the guide rail is arranged on the mounting frame and extends along a preset direction, and the sliding block is connected with the conductive connecting piece and is in sliding connection with the guide rail.

Preferably, the battery testing device further includes:

The workbench, the battery to be tested and the mounting rack are all arranged on the workbench, and the truckles are arranged below the workbench.

Preferably, the caster is provided with a brake device.

Compared with the prior art, the utility model has the beneficial effects that:

According to the battery testing device provided by the utility model, the feeding amount of the conductive element is controlled through the second driving element, so that the depth of the puncture point of the battery to be tested is ensured, the testing precision is further ensured, and the situation that the puncture amount of the conductive element damages the battery core too deeply or the puncture amount is too shallow to cause the aluminum layer which is not contacted with the aluminum-plastic film, so that the testing result is inaccurate is avoided. The first driving piece and the second driving piece are used for respectively controlling the feeding amounts of the conductive connecting piece and the conductive piece, so that the device can adapt to measurement of the edge voltage of the battery to be tested with different thicknesses and improve the universality of the edge voltage test coil device of the battery; meanwhile, the efficiency of detecting the battery side voltage is improved, and the labor cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic structural diagram of a battery testing device according to an embodiment of the present utility model.

Reference numerals:

100. a testing device of the battery;

10. a mounting frame;

20. a first detection mechanism; 21. a first driving member; 22. a conductive connection;

30. a second detection mechanism; 31. a second driving member; 32. a conductive member;

40. a positioning mechanism; 41. a positioning piece;

50. A guide mechanism; 51. a guide rod; 52. a guide member;

60. a work table;

70. casters;

200. a battery to be tested; 210. and a tab.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, 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 explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

When carrying out plastic-aluminum membrane soft package to the electric core, sometimes the PP layer of plastic-aluminum membrane inlayer can produce local impaired, leads to appearing local switching on between them, leads to the electric core can appear corroding, the condition of weeping in the use to lead to the fact whole group electric core to scrap. To prevent the cell with the side voltage from flowing into the market, it is often detected when the cell leaves the factory.

And testing the voltage between the tab and the aluminum plastic film, namely testing the edge voltage. At present, for the test of the edge voltage, the positive and negative line contacts of a universal meter are usually used manually to be respectively contacted with the electrode lugs of the battery cells and the aluminum layer in the middle of the aluminum plastic film, so that the edge voltage test is implemented on the soft package battery. The manual side voltage test is performed manually, so that the problems of false detection or missing detection and the like are easy to occur, the side voltage test precision is not accurate enough, and the detection efficiency is too low.

In order to solve the above-mentioned problems, as shown in fig. 1, the present embodiment provides a testing device 100 for a battery, where the testing device 100 for a battery includes a mounting frame 10, a first detecting mechanism 20, a second detecting mechanism 30 and a detecting instrument (not shown in the drawings), the first detecting mechanism 20 includes a first driving member 21 and a conductive connecting member 22, the first driving member 21 is disposed on the mounting frame 10 and is used for driving the conductive connecting member 22 to approach or separate from a tab 210 of the battery 200 to be tested, the second driving member 31 includes a second driving member 31 and a conductive member 32, the second driving member 31 is used for driving the conductive member 32 to approach or separate from an aluminum-plastic film of the battery 200 to be tested, the conductive member 32 can pierce the aluminum-plastic film and be connected with an aluminum layer of the aluminum-plastic film, and the detecting instrument is used for detecting an edge voltage and/or an edge resistance of the battery 200 to be tested. The first driving member 21 may be a linear cylinder or an electric cylinder. The second driving member 31 may be a linear cylinder or an electric cylinder. The detecting instrument is any current universal meter or voltmeter capable of realizing the functions.

The aluminum plastic film comprises a protective layer, an intermediate layer and a heat sealing layer, wherein the protective layer is preferably made of nylon or PET (polyethylene glycol terephthalate, polyethylene terephthalate) materials, the intermediate layer of the aluminum plastic film is an aluminum layer, and the heat sealing layer is preferably made of polypropylene materials. On the one hand, the second driving piece 31 is used for pushing the conductive piece 32 and accurately controlling the feeding amount of the conductive piece 32, so that the depth of the conductive piece 32 penetrating into the aluminum-plastic film of the soft package lithium battery to be tested is ensured to be within the range of 0.1-0.5mm, the conductive piece is contacted with the aluminum layer, the conduction between the aluminum layer of the aluminum-plastic film and the conductive piece 32 is realized, and the testing precision is ensured. It can be appreciated that the conductive member 32 pierces the aluminum plastic film of the battery 200 to be tested, so as to ensure that the conductive member 32 can reliably contact with the aluminum layer in the aluminum plastic film, thereby realizing the testing process. By ensuring the stability of the penetration point of the battery 200 to be tested, the deviation of the penetration point in the penetration process of the conductive element 32 is avoided to influence the test precision. The position of the penetration point is accurately grasped, and the test deviation caused by the difference of penetration depths due to the structural deviation of the batteries 200 to be tested with different tests is avoided. The feeding amount and the precision of the conductive element 32 are accurately controlled, the penetration depth of the conductive element 32 into the battery core is accurately controlled, and the testing precision is ensured. Preventing too deep penetration from damaging the test pouch cell or too shallow penetration would result in an aluminum layer that does not contact the aluminum plastic film, resulting in inaccurate test results. On the other hand, the first driving member 21 and the second driving member 31 respectively control the feeding amounts of the conductive connecting member 22 and the conductive member 32, so that the device can adapt to the measurement of the side voltage of the battery 200 to be measured with different thicknesses and improve the universality of the side voltage test coil device of the battery; meanwhile, the efficiency of detecting the battery side voltage is improved, and the labor cost is reduced.

Further, as shown in fig. 1, the battery testing device 100 further includes a workbench 60, the battery 200 to be tested and the mounting frame 10 are all disposed on the workbench 60, and the workbench 60 realizes a stable bearing effect of the battery 200 to be tested and the mounting frame 10. Further, the casters 70 are disposed below the working table 60, and the casters 70 enable a worker to push the battery testing device 100 to move with a small force, so that the battery testing device 100 can be moved to a required position, and the flexibility of using the battery testing device 100 is improved. Preferably, the caster 70 is provided with a braking device, and any existing foot-operated braking structure of the caster 70 can be used to facilitate the fixing of the battery testing device 100.

Further, as shown in fig. 1, the battery testing device 100 further includes a guiding mechanism 50, the guiding mechanism 50 includes a guiding rod 51 and a guiding member 52, the first driving member 21 is connected with the conductive connecting member 22 through the guiding member 52, the guiding rod 51 extends along a preset direction and is disposed on the mounting frame 10, and the guiding member 52 is slidably connected with the guiding rod 51. The guide rod 51 plays a certain guiding role on the movement of the conductive member 32, and simultaneously reduces the sliding friction force to ensure the smooth and steady movement of the conductive member 32. In other embodiments, the guide mechanism 50 includes a rail mounted on the mounting frame 10 and extending in a predetermined direction, and a slider connected to the conductive connector 22 and slidably connected to the rail. Note that, the preset direction is a vertical direction in this embodiment.

As shown in fig. 1, the second driving member 31 is disposed on the guiding member 52, and the output end of the second driving member 31 passes through the guiding member 52 and is fixed to the conductive member 32, so that the first driving member 21 drives the conductive connecting member 22 to move along a preset direction, and simultaneously drives the second detecting mechanism 30 to move along the preset direction. During detection, the first driving member 21 drives the conductive connecting member 22 and the second detection mechanism 30 to move downwards at the same time until the conductive connecting member 22 abuts against the tab 210 of the battery 200 to be detected; subsequently, the second driving member 31 drives the conductive member 32 to move downward and pierce the aluminum plastic film of the battery 200 to be tested and connect with the aluminum layer of the aluminum plastic film; the contacts of the test instrument are respectively contacted with the conductive connecting piece 22 and the conductive piece 32 to detect the side voltage of the battery 200 to be tested.

Specifically, the conductive connecting piece 22 includes a positive conductive connecting piece and a negative conductive connecting piece, the tab 210 includes a positive tab and a negative tab, the positive conductive connecting piece can be abutted to the positive tab, the negative conductive connecting piece can be abutted to the negative tab, the positive conductive connecting piece is abutted to the positive tab to realize contact, and the negative conductive connecting piece is abutted to the negative tab to realize contact. Test analysis may be performed by selectively connecting the conductive member 32 to the testing instrument with the positive and negative conductive connectors. Illustratively, the positive conductive connecting piece and the conductive piece 32 are connected with a testing instrument, and can perform a side voltage test between the positive tab and the aluminum layer of the aluminum plastic film of the battery 200 to be tested; the positive electrode conductive connecting piece and the negative electrode conductive connecting piece are connected with a testing instrument, so that the voltage and the like of the battery 200 to be tested can be tested. Testing the resistance between the aluminum plastic film and the negative electrode, testing the current between the aluminum plastic film and the positive electrode, and testing the voltage between the aluminum plastic film and the positive electrode; for testing the resistance between the aluminum plastic film and the negative electrode, the resistance is generally considered to be safe with more than 5M ohms, and the resistance test mainly selects out an electronic path; for testing the current between the positive electrode and the aluminum plastic film, a direct current source is generally used for testing, and the current is generally considered to be more than 0.001mA, so that the current is a defective product; and for testing the voltage between the anode and the aluminum plastic film, the voltage is generally considered to be defective if the voltage is greater than 1V. Because the aluminum-plastic film is provided with static electricity, if the voltage drop is detected to be fast, the insulation between the aluminum-plastic film and the tab 210 is good, and the battery 200 to be detected is judged to be a qualified product; if the voltage release is detected very slowly, the voltage of the whole battery 200 to be tested is tested, the aluminum plastic film is conducted with the tab 210, the battery 200 to be tested is a defective product and cannot flow to the market, because if the aluminum plastic film is conducted with the tab 210, the short circuit of the soft package lithium battery can be caused, so that the damage of the internal PP film layer, the leakage of electrolyte and the like are caused, and serious hidden dangers are caused.

Further, the conductive member 32 is sharp at its end to pierce the aluminum plastic film. Specifically, the conductive member 32 is a bayonet or probe. The conductive member 32 and the conductive connecting member 22 are made of metal or other conductive materials.

As shown in fig. 1, the battery testing device 100 further includes a positioning mechanism 40, wherein the positioning mechanism includes two positioning members 41, and the two positioning members 41 are disposed opposite to each other and abut against two sides of the battery 200 to be tested, so as to position the battery 200 to be tested, and avoid the influence of the position movement of the battery 200 to be tested on the testing precision.

Further, the distance between the two positioning members 41 is adjustable, so as to adapt to the voltage-on-edge test of the battery 200 to be tested with different models, and further improve the versatility of the battery testing device 100.

Specifically, the positioning mechanism 40 further includes a third driving member, an output end of the third driving member is fixed with at least one positioning member 41, the third driving member can drive two positioning members 41 to approach or separate from each other, and the third driving member is provided to automatically adjust a distance between the two positioning members 41, so as to improve an automation degree of the battery testing device 100. The third driving piece can be a linear cylinder or an electric cylinder.

Further, the battery testing device 100 further includes a pushing mechanism, where the pushing mechanism is used to drive the battery 200 to be tested to switch between the loading and unloading station and the testing station. The loading and unloading station is a platform for placing batteries which are not finished in the side voltage test and are finished in the side voltage test, and the testing station is arranged between the two positioning pieces 41 and is used for placing batteries which need the side voltage test. Specifically, the ejection mechanism may be any existing mechanical arm; when the height of the platform where the loading and unloading station is located is equal to the height of the workbench 60, the pushing mechanism may also be an air cylinder or an electric cylinder.

Optionally, the battery 200 to be tested is a folded soft package battery. The plastic-aluminum membrane edge resistor bad product is likely to be corroded, and generally needs to be displayed by a user after a period of use, and the failure of the plastic-aluminum membrane edge resistor bad product is represented by corrosion and cracking of the plastic-aluminum membrane, blackening, cell expanding and incapability of using the plastic-aluminum membrane edge resistor bad product, so that the plastic-aluminum membrane edge resistor bad product is the most serious bad product. In the prior art, an aluminum plastic film outside the edge sealing is punctured after the edge sealing is not folded, and the edge voltage and edge resistance between an aluminum layer and positive and negative electrodes of the aluminum plastic film are measured, however, the edge sealing can also influence the corrosion performance of the battery.

Note that in the description of this specification, a description referring to terms "some embodiments", "other embodiments", and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description is only of the preferred embodiments of the utility model and the technical principles employed. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A test device for a battery, comprising:

A mounting frame (10);

the first detection mechanism (20) comprises a first driving piece (21) and a conductive connecting piece (22), wherein the first driving piece (21) is arranged on the mounting frame (10) and is configured to drive the conductive connecting piece (22) to be close to or far away from a lug (210) of the battery (200) to be detected;

the second detection mechanism (30) comprises a second driving piece (31) and a conductive piece (32), wherein the second driving piece (31) is configured to drive the conductive piece (32) to be close to or far away from an aluminum-plastic film of the battery (200) to be detected, and the conductive piece (32) can penetrate through the aluminum-plastic film to be connected with an aluminum layer of the aluminum-plastic film;

A detection instrument configured to detect a side voltage and/or a side resistance of the battery (200) under test.

2. The apparatus according to claim 1, wherein the apparatus further comprises:

The positioning mechanism (40) comprises two positioning pieces (41), and the two positioning pieces (41) are oppositely arranged and are abutted against two side edges of the battery (200) to be tested.

3. A device for testing a battery according to claim 2, characterized in that the distance between two of said positioning members (41) is adjustable.

4. A battery testing device according to claim 3, wherein the positioning mechanism (40) further comprises a third driving member, an output end of the third driving member being fixed to at least one of the positioning members (41), the third driving member being capable of driving the two positioning members (41) toward or away from each other.

5. The apparatus according to claim 1, wherein the apparatus further comprises:

And the ejection mechanism is configured to drive the battery (200) to be tested to be switched between the loading and unloading stations and the testing station.

6. The battery testing device according to claim 1, wherein the conductive member (32) is a bayonet or a probe.

7. The battery testing device according to claim 1, wherein the battery (200) to be tested is a folded pouch battery.

8. The apparatus according to any one of claims 1 to 7, further comprising:

The guide mechanism (50) comprises a guide rod (51) and a guide piece (52), the first driving piece (21) is connected with the conductive connecting piece (22) through the guide piece (52), the guide rod (51) extends along the preset direction and is arranged on the mounting frame (10), and the guide piece (52) is in sliding connection with the guide rod (51).

9. The apparatus according to any one of claims 1 to 7, further comprising:

The guide mechanism (50) comprises a guide rail and a sliding block, wherein the guide rail is arranged on the mounting frame (10) and extends along a preset direction, and the sliding block is connected with the conductive connecting piece (22) and is in sliding connection with the guide rail.

10. The apparatus according to any one of claims 1 to 7, further comprising:

The workbench (60), the battery (200) to be tested and the mounting frame (10) are both arranged on the workbench (60), the truckle (70) is arranged below the workbench (60), and the truckle (70) is provided with a brake device.