Test device and battery production line

Abstract

The application discloses a test device and a battery production line, and relates to the technical field of batteries, wherein the test device comprises two electrodes, a bearing part and a driving system, the two electrodes are oppositely and spacedly arranged in a first direction, and are used to correspond to the inner side and the outer side of a to-be-tested box wall of a box body, one of the two electrodes is arranged as a local electrode, and the area of the local electrode can correspond to the area of a plurality of local areas of the to-be-tested box wall; the bearing part is used to bear the box body, at least one of the bearing part and the local electrode is movably arranged, so that the local electrode can correspond to the plurality of local areas of the to-be-tested box wall; the driving system drives the local electrode and / or the bearing part; when the local electrode moves to a local area of the to-be-tested box wall in which insulation withstand voltage failure occurs, the two electrodes are coupled to form a closed loop. The technical scheme provided by the application can identify the local area of the to-be-tested box wall in which insulation withstand voltage failure occurs through the movement of the local electrode relative to the to-be-tested box wall, and the compatibility is relatively high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a testing device and a battery production line. Background Technology

[0002] In the field of new energy batteries, insulation withstand voltage testing is a crucial step in ensuring the high-voltage resistance of battery devices. In this step, the insulation withstand voltage testing device actively applies a test voltage much higher than the working voltage to the battery device's enclosure, which can detect insulation withstand voltage failures in advance (such as sealing failure, structural cracks, material aging, etc.), thus preventing electric shock, short circuit fires, and system collapse caused by high-voltage breakdown. However, the compatibility of current insulation withstand voltage testing devices is poor. Utility Model Content

[0003] The main purpose of this application is to propose a testing device and a battery production line, which aims to improve the poor compatibility of current testing devices.

[0004] Firstly, the testing apparatus proposed in this application is used to test the insulation withstand voltage performance of the battery pack housing, the testing apparatus comprising:

[0005] Two electrodes are arranged opposite to each other and spaced apart in a first direction. The two electrodes are arranged on the inner and outer sides of the test box wall of the box body respectively. At least one of the electrodes is set as a local electrode, and the area of ​​the local electrode is set to correspond to the area of ​​multiple local areas of the test box wall.

[0006] A support portion for supporting the housing, wherein at least one of the support portion and the local electrode is movably disposed, such that the support portion and the local electrode can move relative to each other, and that the local electrode can correspond to multiple local areas of the wall of the test chamber; and,

[0007] A drive system drives the locally mounted electrode and / or the carrier portion, which are movably positioned.

[0008] The two electrodes are positioned opposite each other, and when the local electrode moves to the local area where the insulation withstand voltage of the test chamber wall fails, the two electrodes couple to form a closed loop.

[0009] In the technical solution provided in this application, the carrier part is used to support the box body. Two electrodes are respectively disposed on the inner and outer sides of the test box wall of the box body, and one of them is set as a local electrode. Based on the fact that the area of ​​the local electrode corresponds to the area of ​​a local region of the test box wall, that is, the area of ​​the local electrode is smaller than the area of ​​the test box wall, the local electrode and at least one of the carrier parts can move under the driving action of the driving system, so that the local electrode can move relative to the test box wall of the box body, and then the local electrode can move sequentially to correspond to multiple local regions of the test box wall. In this process, the two electrodes always remain opposite in the first direction, and a high test voltage is applied to the inner and outer sides of the test box wall to complete the insulation withstand voltage test of the test box wall; based on this, this application The proposed technical solution leverages the compact size of the local electrodes to test the insulation withstand voltage performance of various enclosures of different specifications, improving the poor compatibility of current testing devices. Also based on the compact size of the local electrodes, the testing device provided in this application has the advantages of small size and low space requirement. Furthermore, during the dynamic movement of the local electrodes relative to the enclosure wall under test, the insulation withstand voltage performance of each local area of ​​the enclosure wall can be tested individually. Once the testing device identifies an insulation withstand voltage failure in the enclosure wall under test, the local area corresponding to the local electrode is the insulation withstand voltage failure area, giving the testing device the ability to accurately identify the insulation withstand voltage failure area of ​​the enclosure, which is beneficial for subsequent repair of the insulation withstand voltage failure area of ​​the enclosure.

[0010] In some embodiments, one of the carrier and the local electrode is movably disposed along at least a second direction, and the other is movably disposed along at least a third direction, wherein the first direction, the second direction, and the third direction intersect each other;

[0011] The drive system includes a first drive mechanism for driving the movement of the local electrode and a second drive mechanism for driving the movement of the support portion.

[0012] In the above technical solution, the local electrode and the support part are driven to move along the second direction and the third direction respectively by the first driving mechanism and the second driving mechanism, so that the local electrode can move arbitrarily in its extension plane relative to the test box wall of the box. This driving method, in which the local electrode and the support part are driven to move along the corresponding direction by two driving mechanisms respectively, has less mutual influence between the two movements, so that the driving system has high driving accuracy.

[0013] In some embodiments, at least one of the carrier portion and the local electrode is also movably disposed in the first direction.

[0014] In the above technical solution, at least one of the carrier and the local electrode is movably arranged along the first direction, which means that the local electrode can approach and move away from the test box wall of the box in the first direction. After the box is installed on the carrier, the carrier and the local electrode can be driven to approach each other, so that the local electrode contacts the test box wall of the box to start the test. After the test is completed, the carrier and the local electrode can be driven to move away from each other, so that the local electrode moves away from the test box wall, so that space can be left on the carrier to place the box.

[0015] In some embodiments, the first drive mechanism has a first movable part and a second movable part, the second movable part being movably disposed along the second direction, and the first movable part being movably disposed in the second movable part along the first direction;

[0016] The local electrode is mounted on the first movable part.

[0017] In the above technical solution, after the local electrode has completed testing a local area of ​​the test chamber wall, the local electrode can be moved away from the support part by the first movable part, thereby detaching from the surface of the test chamber wall. In the subsequent process of the first movable part and the local electrode moving together in the second direction by the second movable part, the local electrode does not come into contact with the surface of the test chamber wall, thereby reducing the degree of wear caused by relative movement between the local electrode and the test chamber wall, improving the service life of the local electrode, and preventing the failure of the chamber insulation withstand voltage due to the movement of the local structure.

[0018] In some embodiments, the testing apparatus further includes a mounting base;

[0019] The first drive mechanism and the second drive mechanism are mounted on the mounting base.

[0020] In the above technical solution, the first drive mechanism and the second drive mechanism are installed on the mounting base at the same time. This arrangement, which connects the first drive mechanism and the second drive mechanism together through the mounting base, helps to reduce the drive error between the first drive mechanism and the second drive mechanism.

[0021] In some embodiments, one of the two electrodes is the local electrode and the other is a carrier electrode, the carrier electrode being used to support the wall of the test chamber, and the carrier portion is formed on the carrier electrode.

[0022] In the above technical solution, the carrier part is formed on the carrier electrode, which means that the carrier electrode not only applies high voltage to the wall of the test chamber, but also serves as the carrier body. Compared with the method of setting the carrier part and the carrier electrode separately, this solution is conducive to simplifying the structure of the test device, reducing the number of drive mechanisms, and reducing the assembly cost of the test device.

[0023] In some embodiments, the local electrode is made of a conductive elastic material.

[0024] In the above technical solution, the material of the local electrode is selected as a conductive elastic material. In addition to giving the local electrode the necessary conductivity, it also gives the local electrode a certain elasticity. When the local electrode contacts the test box wall of the test box and moves relative to the test box wall, the local electrode will not scratch the insulating surface of the test box wall, thereby improving the test reliability of the test device.

[0025] In some embodiments, the conductive elastic material is conductive foam.

[0026] In the above technical solution, the conductive elastic material is specifically limited to conductive foam. On the one hand, conductive foam is readily available in the battery field, and its cost is 50% to 80% lower than that of conductive silicone, which is beneficial for controlling the installation cost. On the other hand, conductive foam has a lower density, which is beneficial for reducing the driving pressure of the drive system.

[0027] In some embodiments, the testing apparatus further includes a warning unit configured to issue a warning signal when the two electrodes are coupled together to form a closed loop.

[0028] In the above technical solution, a warning unit is set up for the testing device. When the two electrodes are coupled together to form a closed circuit, the warning unit can issue a warning signal to remind the operator to intervene, thereby marking the local area of ​​insulation withstand voltage failure of the test chamber wall.

[0029] Secondly, this application also proposes a battery production line that includes the aforementioned testing apparatus. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of an embodiment of the testing apparatus provided in this application;

[0032] Figure 2 for Figure 1 A partial structural diagram of the testing device;

[0033] Figure 3 for Figure 2 Schematic diagram of the structure of section AA;

[0034] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle.

[0035] Explanation of icon numbers:

[0036] 100. Testing equipment;

[0037] 1. Mounting base; 2. Electrode; 21. Local electrode; 22. Bearing electrode; 22a. Bearing part; 3. Drive system; 31. First drive mechanism; 311. First movable part; 312. Second movable part; 313. First drive part; 314. Second drive part; 32. Second drive mechanism; 321. Third movable part; 322. Third drive part;

[0038] 200. Enclosure; 210. Enclosure wall to be tested; 211. Enclosure wall body; 212. First insulation layer; 213. Second insulation layer;

[0039] X, first direction; Y, second direction; Z, third direction.

[0040] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0048] In the field of new energy batteries, insulation withstand voltage testing is a crucial step in ensuring the high-voltage resistance of battery devices. This step is primarily performed by an insulation withstand voltage testing device. Currently, mainstream insulation withstand voltage testing devices mainly consist of two test electrodes. During the insulation withstand voltage test, the two test electrodes are respectively positioned on the inner and outer sides of the test chamber wall, covering its surface. When a high test voltage is applied, if the test chamber wall exhibits insulation withstand voltage failure, the two test electrodes will break down the corresponding defective area, forming a closed circuit. The insulation withstand voltage testing device can identify the current information in this circuit, thus determining that the insulation withstand voltage test has failed. Through insulation withstand voltage testing, insulation withstand voltage failures in the test chamber can be detected early (e.g., sealing failure, structural cracks, material aging, etc.), preventing electric shock, short circuit fires, and system collapse caused by high-voltage breakdown.

[0049] However, current mainstream insulation withstand voltage testing devices suffer from insufficient compatibility. For example, the size of the test electrodes of some insulation withstand voltage testing devices is only compatible with a single size of enclosure (for example, to test the insulation withstand voltage performance of a standard 800mm×600mm enclosure, the corresponding test electrode size is also 800mm×600mm). For other smaller enclosures, the test electrodes cannot easily reach into the enclosure, making testing impossible. For other larger enclosures, the test electrodes can only test a local area of ​​the enclosure wall corresponding to its size, and cannot guarantee whether there is insulation withstand voltage failure in other areas of the enclosure wall, rendering the test meaningless.

[0050] Analysis of the above reasons shows that the current insulation withstand voltage test device's lack of compatibility mainly lies in the size of its test electrodes. It is advisable to consider reducing the size of the test electrodes and adopting a method in which the test electrodes can move relative to the test chamber wall. This would allow the insulation withstand voltage test device to not only test various sizes of chambers, but also accurately detect the location of insulation withstand voltage failure during the test when the test electrodes move relative to the test chamber wall.

[0051] In view of this, this application provides a testing device in which a local electrode of the two electrodes is movable relative to the test chamber wall, which at least improves the problem of poor compatibility of current testing devices. To facilitate understanding of the testing device provided in this application, the following description is provided in conjunction with the accompanying drawings. Figure 1 A schematic diagram of the structure of an embodiment of the testing apparatus provided in this application; Figure 2 for Figure 1 A partial structural diagram of the testing device; Figure 3 for Figure 2 Schematic diagram of the structure of section AA; Figure 4 for Figure 3 A magnified structural diagram of part B in the middle.

[0052] Please see Figure 1In one embodiment of this application, the testing device 100 is used to detect the insulation withstand voltage performance of the battery housing 200. The testing device 100 includes two electrodes 2, a support portion 22a, and a driving system 3. The two electrodes 2 are arranged opposite to each other and spaced apart in a first direction X. The two electrodes 2 are correspondingly arranged on the inner and outer sides of the test wall 210 of the housing 200. At least one of the electrodes 2 is set as a local electrode 21, and the area of ​​the local electrode 21 is set to correspond to the area of ​​multiple local areas of the test wall 210. 22a is used to support the housing 200. At least one of the support part 22a and the local electrode 21 is movably arranged so that the support part 22a and the local electrode 21 can move relative to each other and the local electrode 21 can correspond to multiple local areas of the test housing wall 210. The drive system 3 drives the movably arranged local electrode 21 and / or the support part 22a. The two electrodes 2 are kept relative to each other, and when the local electrode 21 moves to the local area of ​​the test housing wall 210 where the insulation withstand voltage fails, the two electrodes 2 are coupled to each other to form a closed loop.

[0053] It should be noted that the battery pack housing 200 typically has a test wall 210, which is usually the bottom wall of the housing 200, i.e., the part that directly contacts the individual battery cells. Therefore, the test wall 210 needs to meet high insulation withstand voltage requirements. Typically, the test wall 210 includes a main body 211 and a first insulating layer 212 and a second insulating layer 213 respectively disposed on the inner and outer surfaces of the main body 211. (See [link to relevant documentation]). Figure 3 and Figure 4 If the insulation layer on any one side is damaged or defective, it can easily lead to the failure of the insulation withstand voltage of the main body of the box wall 211, affecting the reliability of the battery device.

[0054] "Two electrodes 2 are positioned opposite each other and spaced apart in the first direction X." The purpose of this spacing is to allow the test wall 210 of the housing 200 to be positioned between them. During testing, the two electrodes 2 can contact the insulating layers of the inner and outer surfaces of the test wall 210, respectively, and apply corresponding high voltages. The local electrode 21 can be positioned on either the inner or outer surface of the test wall 210. To leverage the compact size of the local electrode 21, it is typically positioned on the inner surface. In this embodiment, the first direction X can also be understood as the thickness direction of the test wall 210 after the housing 200 is mounted on the support portion 22a. "At least one electrode 2 is set as a local electrode 21" can be understood as either only one electrode 2 being set as a local electrode 21, or both electrodes 2 being set as local electrodes 21. Regardless of the arrangement, the two electrodes 2 should at least [specify the distance between them] in the first direction X. When the two electrodes 2 are kept in a relative position, it can also be understood that the projections of the two electrodes 2 in the first direction X coincide. The purpose of the "relative position" is that when the local electrode 21 moves to the insulation withstand voltage failure area on the test chamber wall 210, the high voltage current can easily break down the defect area, thereby realizing the coupling and conduction of the two electrodes 2. This prevents the test failure caused by the difficulty of high voltage current breakdown when the positions of the two electrodes 2 are deviated. The area of ​​the other electrode 2 can be set to be equivalent to or larger than the area of ​​the local electrode 21. However, it should be noted that when the areas of the two electrodes 2 are equivalent, if the local electrode 21 moves relative to the test chamber wall 210, in order to ensure that the two electrodes 2 are set in a relative position in the first direction X, the other electrode 2 should also move relative to the test chamber wall 210 along with the local electrode 21. When the area of ​​the other electrode 2 is large enough to cover the active area of ​​the local electrode 21, then the electrode 2 can be fixed relative to the local electrode 21.

[0055] In this embodiment, the area of ​​the local electrode 21 is smaller than the area of ​​the test box wall 210 of the box 200. Therefore, during the movement of the local electrode 21 relative to the test box wall 210, the local electrode 21 can reach multiple local areas of the test box wall 210 and test each local area of ​​the test box wall 210 one by one by "scanning", and finally achieve the test of the entire area of ​​the test box wall 210.

[0056] To facilitate understanding of the movement of the local electrode 21 relative to the test chamber wall 210, the test chamber wall 210 is defined as extending within the plane where the second direction Y and the third direction Z intersect (i.e., the second direction Y and the third direction Z can be the length and width directions of the test chamber wall 210, respectively). When the dimension of the local electrode 21 along the second direction Y is equivalent to the dimension of the test chamber wall 210 along the second direction Y, then the dimension of the local electrode 21 along the third direction Z should be at least smaller than the dimension of the test chamber wall 210 along the third direction Z. This ensures that the local electrode 21 gradually "scans" multiple local areas distributed along the third direction Z of the test chamber wall 210 during its movement relative to the test chamber wall 210 along the third direction Z. When the dimension of the local electrode 21 along the second direction Y is smaller than the dimension of the test chamber wall 210 along the second direction Y, and the dimension of the local electrode 21 along the third direction Z is also smaller than the dimension of the test chamber wall 210 along the third direction Z, such as... Figure 1 As shown, the local electrode 21 needs to be able to move not only along the second direction Y relative to the test chamber wall 210, but also along the third direction Z relative to the test chamber wall 210, so that it can gradually "scan" multiple local areas of the test chamber wall 210 distributed along the second direction Y and the third direction Z respectively.

[0057] It should be noted that the first direction X, the second direction Y, and the third direction Z mentioned in the embodiments of this application are three directions that intersect each other. In principle, the included angle between each pair can be any value between 0° and 180° (excluding 0° and 180°). However, under normal circumstances, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, that is, the included angle is 90°.

[0058] The activity logic of the local electrode 21 relative to the test chamber wall 210 includes two cases. In one case, the local electrode 21 moves slowly and continuously relative to the test chamber wall 210 along a specific activity trajectory. In the other case, the local electrode 21 moves intermittently relative to the test chamber wall 210 along a specific activity trajectory. For example, in a specific scheme, multiple local areas of the test chamber wall 210 are arranged adjacent to each other. The local electrode 21 stays in the corresponding local area for a set time. This set time is also used for the local electrode 21 to perform static pressure testing on the local area. After the test on one local area is completed, the local electrode 21 needs to be moved to another adjacent local area for repeated static heating testing. The time taken for this transfer process can vary, and it can also be comparable to the set time of the static pressure test of the local electrode 21.

[0059] The function of the "supporting part 22a" is to provide a base for the housing 200. In order to realize the movement of the local electrode 21 relative to the test housing wall 210, at least one of the supporting part 22a and the local electrode 21 should be movable. During the relative movement of the supporting part 22a and the local electrode 21, the local electrode 21 can correspond to multiple local areas of the test housing wall 210. This includes multiple schemes. For example, if the supporting part 22a remains stationary, then the local electrode 21 needs to be able to move relative to the supporting part 22a. If the local electrode 21 remains stationary, then the supporting part 22a needs to drive the housing 200 to move relative to the local electrode 21. At the same time, the supporting part 22a and the local electrode 21 can be set to be movable, so that the testing device 100 has a higher degree of flexibility.

[0060] "Drive system 3 drives the movable local electrode 21 and / or the support part 22a" means that the movement of the local electrode 21 and the support part 22a is achieved by the drive system 3. If only the local electrode 21 is movable, then the drive system 3 only needs to drive the local electrode 21 to move; if only the support part 22a is movable, then the drive system 3 only needs to drive the local electrode 21 to move. The specific way in which the drive system 3 drives the local electrode 21 and / or the support part 22a to move should be determined according to the matching of the length and width dimensions of the local electrode 21 and the test chamber wall 210, which will not be elaborated here. There are various specific structural forms of the drive system 3. For example, the drive system 3 can be driven by a mechanical arm clamping, or it can be driven by a combination of drive screws. This embodiment does not limit this.

[0061] In the technical solution provided in this application, the support part 22a is used to support the box 200. Two electrodes 2 are respectively disposed on the inner and outer sides of the test box wall 210 of the box 200, and one of them is set as a local electrode 21. Based on the fact that the area of ​​the local electrode 21 corresponds to the area of ​​the local region of the test box wall 210, that is, the area of ​​the local electrode 21 is smaller than the area of ​​the test box wall 210, the local electrode 21 and at least one of the support part 22a can move under the driving action of the driving system 3, so that the local electrode 21 can move relative to the test box wall 210 of the box 200, and then the local electrode 21 can move sequentially to correspond to multiple local regions of the test box wall 210. In this process, the two electrodes 2 always remain opposite in the first direction X, and apply a high test voltage to the inner and outer sides of the test box wall 210 to complete the insulation withstand voltage test of the test box wall 210.

[0062] Based on this, the technical solution provided in this application can utilize the small size of the local electrode 21 to test the insulation withstand voltage performance of various sizes of enclosures 200, improving the poor compatibility of the current testing device 100. Also based on the small size of the local electrode 21, the testing device 100 provided in this application also has the advantages of small size and low space occupation. Moreover, during the dynamic movement of the local electrode 21 relative to the enclosure wall 210 under test, the insulation withstand voltage performance of each local area of ​​the enclosure wall 210 under test can be tested one by one. Once the testing device 100 identifies that the enclosure wall 210 under test has an insulation withstand voltage failure problem, the local area of ​​the enclosure wall 210 under test corresponding to the local electrode 21 is the insulation withstand voltage failure area, which gives the testing device 100 the function of accurately identifying the insulation withstand voltage failure area of ​​the enclosure 200, which is beneficial for subsequent repair of the insulation withstand voltage failure area of ​​the enclosure 200.

[0063] Please continue reading. Figure 1 In some embodiments, one of the carrier portion 22a and the local electrode 21 is movably disposed at least along the second direction Y, and the other is movably disposed at least along the third direction Z, with the first direction X, the second direction Y and the third direction Z intersecting each other; the drive system 3 includes a first drive mechanism 31 for driving the local electrode 21 to move, and a second drive mechanism 32 for driving the carrier portion 22a to move.

[0064] It should be noted that "one of the support portion 22a and the local electrode 21 is movable at least along the second direction Y, and the other is movable at least along the third direction Z" can be understood as the local electrode 21 being movable at least along the second direction Y (the local electrode 21 may also be movable in other directions), the support portion 22a being movable at least along the third direction Z (the support portion 22a may also be movable in other directions), or the local electrode 21 being movable at least along the third direction Z, and the support portion 22a being movable at least along the second direction Y.

[0065] In the above technical solution, the local electrode 21 and the support part 22a are driven to move along the second direction Y and the third direction Z respectively by the first driving mechanism 31 and the second driving mechanism 32, so that the local electrode 21 can move arbitrarily in its extension plane relative to the test box wall 210 of the box 200. This driving method, in which the local electrode 21 and the support part 22a are driven to move along the corresponding directions by two driving mechanisms respectively, has less mutual influence between the two movements, so that the driving system 3 has high driving accuracy.

[0066] In some embodiments, at least one of the carrier portion 22a and the local electrode 21 is also movably disposed in the first direction X.

[0067] It should be noted that since the two electrodes 2 are opposite each other in the first direction X, it means that the local electrode 21 acts on the side of the test chamber wall 210 facing the first direction X. "At least one of the support part 22a and the local electrode 21 is still movable in the first direction X" can be understood as only the support part 22a can be movable in the first direction X, or only the local electrode 21 can be movable in the first direction X, or the support part 22a and the local electrode 21 can be movable in the first direction X respectively. Regardless of the arrangement, the distance between the support part 22a and the local electrode 21 in the first direction X can be changed, that is, the distance between the chamber 200 set on the support part 22a and the local electrode 21 can be changed. In other words, the local electrode 21 can be set close to and away from the test chamber wall 210 of the chamber 200 in the first direction X.

[0068] In the above technical solution, at least one of the support part 22a and the local electrode 21 is movably arranged along the first direction X. This means that the local electrode 21 can approach and move away from the test box wall 210 of the box 200 in the first direction X. After the box 200 is installed on the support part 22a, the support part 22a and the local electrode 21 can be driven to approach each other, so that the local electrode 21 contacts the test box wall 210 of the box 200 to start the test. After the test is completed, the support part 22a and the local electrode 21 can be driven to move away from each other, so that the local electrode 21 moves away from the test box wall 210, so that space is left on the support part 22a to place the box 200.

[0069] In some embodiments, the first drive mechanism 31 has a first movable part 311 and a second movable part 312, the second movable part 312 is movably disposed along the second direction Y, and the first movable part 311 is movably disposed on the second movable part 312 along the first direction X; the local electrode 21 is mounted on the first movable part 311.

[0070] The first movable part 311 is movably disposed on the second movable part 312 along the first direction X. The first movable part 311 and the second movable part 312 can move independently. For example, please refer to Figure 1 The first movable part 311 moves under the driving action of the first driving part 313, and the second movable part 312 moves under the driving action of the second driving part 314. The first driving part 313 is installed on the second movable part 312, and the first movable part 311 is indirectly installed on the second movable part 312 through the first driving part 313. Under the drive of the second movable part 312, the first movable part 311 and the local electrode 21 as a whole can adjust their positions in the second direction Y. Under the drive of the first movable part 311, the local electrode 21 can be positioned closer to and further away from the support part 22a along the first direction X.

[0071] When the above technical solution is incorporated into the testing process, after the local electrode 21 has completed testing a local area of ​​the test chamber wall 210, the first movable part 311 can move the local electrode 21 away from the support part 22a, thereby detaching it from the surface of the test chamber wall 210. In the subsequent process where the second movable part 312 moves the first movable part 311 and the local electrode 21 together along the second direction Y, the local electrode 21 does not come into contact with the surface of the test chamber wall 210, thereby reducing the degree of wear caused by relative movement between the local electrode 21 and the test chamber wall 210, improving the service life of the local electrode 21, and preventing the insulation withstand voltage failure of the chamber 200 due to the movement of the local structure.

[0072] In some embodiments, the test apparatus 100 further includes a mounting base 1; the first drive mechanism 31 and the second drive mechanism 32 are mounted on the mounting base 1.

[0073] The above embodiments do not limit the installation positions of the first drive mechanism 31 and the second drive mechanism 32. The two drive mechanisms can be set on different fixed parts. However, in this embodiment, the first drive mechanism 31 and the second drive mechanism 32 are installed on the mounting base 1 at the same time. With this setting, the first drive mechanism 31 and the second drive mechanism 32 are associated together through the mounting base 1, which helps to reduce the driving error of the first drive mechanism 31 and the second drive mechanism 32.

[0074] Please see Figure 1 In other embodiments, the first drive mechanism 31 further includes a first drive part 313 and a second drive part 314, and the second drive mechanism 32 further includes a third drive part 322. The first drive part 313 and the third drive part 322 are respectively disposed on the mounting base 1. The first drive part 313, the second drive part 314, and the third drive part 322 can be drive motors equipped with transmission screws. The first movable part 311, the second movable part 312, and the third movable part 321 can be respectively disposed on the transmission screws of the corresponding drive motors. Under the driving action of the drive motors, the transmission screws can engage with the mating screw sleeves on the movable parts, thereby driving the corresponding movable parts to move in the corresponding directions.

[0075] Please see Figures 1 to 3 In some embodiments, one of the two electrodes 2 is a local electrode 21 and the other is a carrier electrode 22. The carrier electrode 22 is used to support the wall of the test chamber, and the carrier portion 22a is formed on the carrier electrode 22.

[0076] Since the support portion 22a is formed on the support electrode 22, the support electrode 22 also needs to be installed in the housing 200. Therefore, the position of the support electrode 22 is fixed relative to the housing 200. The area of ​​the support electrode 22 is usually larger than the overall area of ​​the test wall 210 of the housing 200. The support electrode 22 can apply a high test voltage to the entire surface of the test wall 210.

[0077] In the above technical solution, the support part 22a is formed on the support electrode 22, which means that the support electrode 22 not only applies high voltage to the test chamber wall 210, but also supports the chamber 200. Compared with the method of setting the support part 22a and the support electrode 22 separately, this solution is conducive to simplifying the structure of the test device 100, reducing the number of drive mechanisms, and reducing the assembly cost of the test device 100.

[0078] In some embodiments, the local electrode 21 is made of a conductive elastic material.

[0079] "Conductive elastic material" refers to a material that has both conductive and elastic properties. The elastic properties are relative to the test box wall 210 of the box 200. It can also be understood that the local electrode 21 has higher elasticity than the test box wall 210. There are many types of such materials, such as adding conductive fillers to a basic elastic polymer matrix to form a conductive path (conductive silicone filled with silver powder), or shape memory alloys (nickel-titanium alloys). This embodiment does not limit this.

[0080] In the above technical solution, the material of the local electrode 21 is selected as a conductive elastic material. In addition to giving the local electrode 21 the necessary conductivity, it also gives the local electrode 21 a certain elasticity. When the local electrode 21 contacts the test box wall 210 of the box 200 and moves relative to the test box wall 210, the local electrode 21 will not scratch the insulating surface of the test box wall 210, thereby improving the test reliability of the test device 100.

[0081] In some embodiments, the conductive elastic material is conductive foam.

[0082] "Conductive foam" is a special material that combines conductivity and elastic cushioning. It is usually polyurethane (PU) or silicone rubber open-cell foam, which has high elasticity, compressibility and resilience. The open-cell foam structure allows it to be uniformly covered by a conductive layer and maintains conductive contact during compression.

[0083] In the above technical solution, the conductive elastic material is specifically limited to conductive foam. On the one hand, conductive foam is readily available in the battery field, and its cost is 50% to 80% lower than that of conductive silicone, which is beneficial for controlling the installation cost. On the other hand, conductive foam has a lower density, which is beneficial for reducing the driving pressure of the drive system 3.

[0084] In some embodiments, the testing apparatus 100 further includes a warning unit configured to issue a warning signal when the two electrodes 2 are coupled together to form a closed loop.

[0085] The "alarm unit" refers to a component that can emit an alarm signal when the two electrodes 2 are coupled together to form a closed loop. For example, when the alarm unit is an alarm light, the alarm signal can be a light-emitting signal; or when the alarm unit is a buzzer, the alarm signal can be a buzzing signal. This embodiment does not limit the specific structural form of the alarm unit. Normally, the alarm unit can be directly connected to the test circuit by connecting it in series with the two electrodes 2. Of course, the alarm unit can also be indirectly associated with the test circuit through a controller.

[0086] In the above technical solution, a warning unit is provided for the testing device 100. When the two electrodes 2 are coupled together to form a closed circuit, the warning unit can issue a warning signal to remind the operator to intervene, thereby marking the local area of ​​insulation withstand voltage failure of the test box wall 210 of the box 200.

[0087] This application also proposes a battery production line, which includes a testing device 100. The specific structure of the testing device 100 is as described in the above embodiments. Since this battery production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0088] This application discloses a testing device 100 for detecting the insulation withstand voltage performance of a battery casing 200. The testing device 100 includes a mounting base 1, a first driving mechanism 31, a second driving mechanism 32, a bearing electrode 22, and a local electrode 21. The first driving mechanism 31 and the second driving mechanism 32 are mounted on the mounting base 1. The first driving mechanism 31 includes a first movable part 311 and a second movable part 312. The second movable part 312 is movably disposed along a second direction Y, and the first movable part 311 is movably disposed on the second movable part 312 along a first direction X. The local electrode 21 is mounted on the first movable part 311. The second driving mechanism 32 includes a third movable part 321, which is movably disposed along a third direction Z. In the active configuration, the carrier electrode 22 is installed on the third active part 321. The carrier electrode 22 and the local electrode 21 are arranged opposite to each other and spaced apart in the first direction X, respectively, to be arranged on the inner and outer sides of the test box wall 210 of the box body 200. The area of ​​the local electrode 21 is set to correspond to the area of ​​multiple local areas of the test box wall 210. Under the relative movement of the second active part 312 and the third active part 321, the local electrode 21 can correspond to multiple local areas of the test box wall 210 respectively. When the local electrode 21 moves to the local area of ​​the test box wall 210 where the insulation withstand voltage fails, the carrier electrode 22 and the local electrode 21 are coupled to form a closed loop. The material of the local electrode 21 is conductive foam.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A testing device for detecting the insulation withstand voltage performance of a battery casing, characterized in that, The testing apparatus includes: Two electrodes are arranged opposite to each other and spaced apart in a first direction. The two electrodes are arranged on the inner and outer sides of the test box wall of the box body respectively. At least one of the electrodes is set as a local electrode, and the area of ​​the local electrode is set to correspond to the area of ​​multiple local areas of the test box wall. A support portion for supporting the housing, wherein at least one of the support portion and the local electrode is movably disposed, such that the support portion and the local electrode can move relative to each other, and that the local electrode can correspond to multiple local areas of the wall of the test chamber; and, A drive system drives the locally mounted electrode and / or the carrier portion, which are movably positioned. The two electrodes are positioned opposite each other, and when the local electrode moves to the local area where the insulation withstand voltage of the test chamber wall fails, the two electrodes couple to form a closed loop.

2. The testing apparatus as described in claim 1, characterized in that, One of the carrier and the local electrode is movably disposed along at least the second direction, and the other is movably disposed along at least the third direction, wherein the first direction, the second direction and the third direction intersect each other; The drive system includes a first drive mechanism for driving the movement of the local electrode and a second drive mechanism for driving the movement of the support portion.

3. The testing apparatus as described in claim 2, characterized in that, At least one of the support portion and the local electrode is also movably disposed in the first direction.

4. The testing apparatus as described in claim 3, characterized in that, The first drive mechanism has a first movable part and a second movable part, the second movable part being movably disposed along the second direction, and the first movable part being movably disposed in the second movable part along the first direction; The local electrode is mounted on the first movable part.

5. The testing apparatus as described in claim 2, characterized in that, The testing device also includes a mounting base; The first drive mechanism and the second drive mechanism are mounted on the mounting base.

6. The testing apparatus according to any one of claims 1 to 5, characterized in that, One of the two electrodes is the local electrode, and the other is the support electrode. The support electrode is used to support the wall of the test chamber, and the support portion is formed on the support electrode.

7. The testing apparatus according to any one of claims 1 to 5, characterized in that, The local electrode is made of a conductive elastic material.

8. The testing apparatus as described in claim 7, characterized in that, The conductive elastic material is conductive foam.

9. The testing apparatus according to any one of claims 1 to 5, characterized in that, The testing device also includes a warning unit configured to issue a warning signal when the two electrodes are coupled together to form a closed loop.

10. A battery production line, characterized in that, Includes the test apparatus as described in any one of claims 1 to 9.

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