Positioning jig for testing and testing equipment

Abstract

The utility model relates to the field of battery testing, in particular to a positioning jig for testing and testing equipment. The positioning jig for testing comprises a base assembly, a clamping mechanism and a fixing mechanism, the base assembly is provided with a bearing surface for placing a tested battery; the clamping mechanism is mounted on the base assembly so as to clamp a tab of the tested battery; the fixing mechanism is used for fixing a testing head of an internal resistance tester, and the fixing mechanism is movably installed on the clamping mechanism, so that the testing head corresponds to the tested position of the tab. According to the positioning jig for testing provided by the invention, the consistency of measuring points can be ensured when internal resistance testing is carried out on batteries with the same specification, and the universality testing of multiple types of soft package batteries can also be realized; and an additional power supply, an air pump, a motor and other devices of pneumatic equipment are not needed, so that miniaturization and generalization of the test fixture are realized, and the test fixture is more suitable for being used in a laboratory.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a testing positioning fixture and testing equipment. Background Art

[0002] For battery cells of the same specification, there are certain differences in the internal resistance tested at different positions of the tabs, which has a negative impact on the consistent classification of the battery cells. Therefore, it is necessary to limit the battery through a fixture to ensure that the internal resistance test head is positioned at the same position of the tabs of battery cells of the same specification before measurement.

[0003] Most existing test fixtures are used in production environments, so they are equipped with additional power supplies, air pumps, motors, etc. The equipment is large in size and not suitable for use in laboratories. Utility Model Content

[0004] The purpose of this application is to provide a test positioning fixture and test equipment, which can position the internal resistance test head to the same position of the pole ear of the battery cell of the same specification, thereby ensuring the consistency of the test and being suitable for use in the laboratory.

[0005] The present application provides a positioning fixture for testing, including a base assembly, a clamping mechanism and a fixing mechanism;

[0006] The base assembly is provided with a supporting surface for placing the battery to be tested;

[0007] The clamping mechanism is installed on the base assembly to clamp the tab of the battery under test;

[0008] The fixing mechanism is used to fix the test head of the internal resistance tester, and the fixing mechanism is movably mounted on the clamping mechanism so that the test head corresponds to the measured position of the tab.

[0009] In the above technical solution, further, the clamping mechanism corresponds one-to-one to the tabs of the battery under test;

[0010] The base assembly is provided with a first guide rail, the guiding direction of the first guide rail is the length direction of the tab lead-out surface of the battery under test; the clamping mechanism is slidably mounted on the first guide rail.

[0011] In the above technical solution, further, the clamping mechanism is provided with a first abutment surface, and the tab lead-out surface of the battery under test is in contact with the first abutment surface;

[0012] And / or the base assembly is provided with a second abutment surface, and the side wall surface of the battery under test is in contact with the second abutment surface.

[0013] In the above technical solution, further, the clamping mechanism includes a clamp base, a clamp upper cover and an elastic clamping plate;

[0014] The clamp base is mounted on the base assembly, the clamp upper cover is connected to the clamp base, and the fixing mechanism is movably mounted on the clamp upper cover;

[0015] The elastic clamp is installed on the clamp base, and the clamping position of the elastic clamp is opposite to the clamping position of the clamp cover; the elastic clamp has a tendency to approach the clamp cover.

[0016] In the above technical solution, further, the elastic clamp includes an elastic member and a clamp member;

[0017] The fixture base is provided with a guide cavity, and the elastic member is installed in the guide cavity;

[0018] The clamping plate is provided with a guide portion, which extends into the guide cavity and abuts against the elastic member.

[0019] In the above technical solution, further, the clamping mechanism also includes a button assembly;

[0020] The button assembly is installed between the clamp upper cover and the elastic clamping plate to keep the elastic clamping plate away from the clamp and can lock and unlock the position of the elastic clamping plate.

[0021] In the above technical solution, further, the fixing mechanism includes a fixing member;

[0022] The test head is mounted on the fixing member; the upper cover of the fixture is provided with a second guide rail, the guiding direction of the second guide rail is the length direction of the tab; the fixing member is slidably mounted on the second guide rail;

[0023] The fixing member is provided with a third guide rail, the guiding direction of the third guide rail is the width direction of the tab; the test head is slidably mounted on the third guide rail.

[0024] In the above technical solution, further, the clamp upper cover includes a connecting portion and a clamping portion;

[0025] The connecting part is connected to the clamp base; the clamping part includes a guide and two spaced-apart pressing plates; one end of the two pressing plates is connected to the connecting part; the guide is spaced-apart from the connecting part, and the two ends of the guide are respectively connected to the other ends of the two pressing plates to enclose a clamping area forming the clamp upper cover; the bottom surface of the guide is flush with the bottom surfaces of the two pressing plates;

[0026] The second guide rail includes a guide groove formed in the connecting portion and a guide through hole formed in the guide member, and two ends of the fixing member are slidably mounted in the guide groove and the guide through hole respectively.

[0027] In the above technical solution, further, the substrate assembly includes a first substrate and a second substrate;

[0028] One of the first base and the second base is provided with a guide rod, and the other is provided with a fourth guide rail, and the guide rod is slidably mounted on the fourth guide rail, so that the first base and the second base are combined to form the supporting surfaces with different areas.

[0029] The present application also provides a testing device, including the testing positioning fixture described in the above scheme.

[0030] Compared with the prior art, the beneficial effects of this application are:

[0031] The test positioning fixture provided in the present application can ensure the consistency of the measurement points when conducting internal resistance tests on batteries of the same specification, and can also realize universal testing of multiple types of soft-pack batteries; and does not require additional power supplies, air pumps, motors and other devices of pneumatic equipment, thereby realizing the miniaturization and universalization of the test fixture, which is more suitable for use in laboratories.

[0032] The present application also provides a test device, including the test positioning fixture described in the above solution. Based on the above analysis, it can be seen that the test device also has the above beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A first structural schematic diagram of the test positioning fixture provided in this application;

[0035] Figure 2 A second structural schematic diagram of the test positioning fixture provided in this application;

[0036] Figure 3 A schematic diagram of the structure of the clamping mechanism provided in this application;

[0037] Figure 4 This is a third structural schematic diagram of the testing positioning fixture provided in this application.

[0038] In the figure: 101-base assembly; 102-clamping mechanism; 103-internal resistance tester; 104-tested battery; 105-test head; 106-supporting surface; 107-first guide rail; 108-first abutment surface; 109-second abutment surface; 110-clamp base; 111-clamp upper cover; 112-elastic clamp; 113-elastic member; 114-clamp member; 115-guide cavity; 116-guide portion; 117-guide column; 118-spring; 119-button assembly; 120-fixing member; 121-mounting hole; 122-connecting portion; 123-guide member; 124-pressing plate; 125-guide groove; 126-guide through hole; 127-connecting hole; 128-first base; 129-second base; 130-guide rod. DETAILED DESCRIPTION

[0039] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] See also Figures 1 to 4As shown, the test positioning fixture provided by the present application includes a base assembly 101, a clamping mechanism 102 and a fixing mechanism. The base assembly 101 is provided with a supporting surface 106 for placing the battery 104 under test. The clamping mechanism 102 is installed on the base assembly 101 to clamp the tab of the battery 104 under test. The fixing mechanism is used to fix the test head 105 of the internal resistance tester 103, and the fixing mechanism is movably installed on the clamping mechanism 102 so that the test head 105 corresponds to the measured position on the tab surface.

[0044] Specifically, when the internal resistance test of the battery 104 is performed, the operator first places the battery 104 on the supporting surface 106 of the base assembly 101, and then uses the clamping mechanism 102 to clamp the tab of the battery 104 to prevent the tab from moving during the test, so as to ensure the consistency of the tab test position. Generally speaking, the tested position is the middle of the tab. After the tab is clamped, the fixing mechanism equipped with the test head 105 can be moved relative to the clamping mechanism 102 to align the test head 105 with the middle of the tab, and then the internal resistance tester 103 can be turned on to start the test process.

[0045] For the same specification of the tested battery 104, after the position of the test head 105 is adjusted for the first time, the test head 105 can be kept in this position, so that the test head 105 can test the same position of the pole lug of the same specification of the tested battery 104. For different specifications of the tested battery 104, the tested position may be different. At this time, the position of the fixing mechanism can be adjusted to align the test head 105 with the middle of the pole lug, so as to achieve the internal resistance test of the tested battery 104 of various specifications, which is more versatile.

[0046] The test positioning fixture provided in the present application can ensure the consistency of the measurement points when conducting internal resistance tests on batteries of the same specification, and can also realize universal testing of multiple types of soft-pack batteries; and does not require additional power supplies, air pumps, motors and other devices of pneumatic equipment, thereby realizing the miniaturization and universalization of the test fixture, which is more suitable for use in laboratories.

[0047] In an optional solution of this embodiment, the clamping mechanism 102 corresponds to the tabs of the battery 104 under test one by one; the base assembly 101 is provided with a first guide rail 107, and the guiding direction of the first guide rail 107 is the length direction of the tab lead-out surface of the battery 104 under test; the clamping mechanism 102 is slidably mounted on the first guide rail 107. Figure 1 and Figure 2 As shown, the base assembly 101 is provided with two first guide rails 107 spaced apart from each other, and the clamping mechanism 102 is detachably mounted on the first guide rails 107 .

[0048] for Figure 1For the battery 104 under test with double-sided lead-out tabs shown in the figure, the positive tab and the negative tab are respectively located at the two ends of the battery 104 under test, and at this time, relative clamping mechanisms 102 are installed on the two rails. Specifically, a clamping mechanism 102 needs to be installed on one of the first rails 107, and the clamping mechanism 102 can move along the first rail 107 so that the clamping mechanism 102 corresponds to the positive tab, thereby clamping and positioning the positive tab. A clamping mechanism 102 needs to be installed on the other first rail 107, and the clamping mechanism 102 can move along the first rail 107 so that the clamping mechanism 102 corresponds to the negative tab, thereby clamping and positioning the negative tab.

[0049] for Figure 2 For the battery 104 under test with a single-side lead-out tab shown in FIG, the positive tab and the negative tab are located at the same end of the battery 104 under test, and the positive tab and the negative tab are spaced apart along the length direction of the tab lead-out surface of the battery 104 under test. Correspondingly, two clamping mechanisms 102 need to be installed on the first guide rail 107 corresponding to the tab lead-out surface of the battery 104 under test, and the two clamping mechanisms 102 can move along the first guide rail 107. One of the clamping mechanisms 102 can correspond to the positive tab to clamp and position the positive tab; the other clamping mechanism 102 can correspond to the negative tab to clamp and position the negative tab.

[0050] In an optional solution of this embodiment, the clamping mechanism 102 is provided with a first abutment surface 108, and the lead-out surface of the electrode ear of the battery 104 under test is in contact with the first abutment surface 108; and / or the base assembly 101 is provided with a second abutment surface 109, and the side wall surface of the battery 104 under test is in contact with the second abutment surface 109.

[0051] In this embodiment, when the battery 104 to be tested is placed on the supporting surface 106, the two surfaces of the battery 104 to be tested are respectively in contact with the first abutting surface 108 and the second abutting surface, so that the battery 104 to be tested is placed in the reference position, and then the clamping mechanism 102 can clamp and position the tab. In this way, when testing multiple batteries 104 of the same specification, after the battery 104 to be tested is placed in the reference position, the test position can be kept consistent without adjusting the position of the test head 105.

[0052] In the optional solution of this embodiment, specifically as follows Figure 3As shown, the clamping mechanism 102 includes a clamp base 110, a clamp upper cover 111 and an elastic clamp plate 112. The clamp base 110 is installed on the base assembly 101. An L-shaped guide groove is provided on the base assembly 101, and an L-shaped guide bar is provided at the bottom of the clamp base 110. The L-shaped guide bar is slidably installed in the L-shaped guide groove to form the structure of the first guide rail 107. The clamp upper cover 111 is connected to the clamp base 110 by bolts. When clamping the pole lug, the position of the clamp upper cover 111 remains unchanged. The fixing mechanism is movably installed on the clamp upper cover 111, so that the test head 105 installed on the fixing mechanism can perform internal resistance test on the battery from the upper surface of the pole lug.

[0053] Furthermore, the elastic clamp 112 is mounted on the fixture base 110, the clamping position of the elastic clamp 112 is opposite to the clamping position of the fixture cover 111, and the end faces of the fixture cover 111 and the elastic clamp 112 constitute the first abutment surface 108. The elastic clamp 112 has a tendency to approach the fixture cover 111, and under the action of elastic force, the elastic clamp 112 and the fixed fixture cover 111 can clamp the tab in place to prevent the tab from moving, thereby ensuring the consistency of the test.

[0054] In an optional solution of this embodiment, the elastic clamp 112 includes an elastic member 113 and a clamp member 114; the clamp base 110 is provided with a guide cavity 115, and the elastic member 113 is installed in the guide cavity 115; the clamp member 114 is provided with a guide portion 116, which extends into the guide cavity 115 and abuts against the elastic member 113.

[0055] In this embodiment, if Figure 3 As shown, along the length direction of the first guide rail 107, the clamp base 110 is provided with a plurality of guide cavities 115, and a guide column 117 is arranged in the guide cavity 115. The elastic member 113 includes a plurality of springs 118, and the plurality of springs 118 are sleeved on the outside of the guide column 117, which can realize the installation and positioning of the spring 118, so that the spring 118 can bounce along the guide direction of the guide column 117. The clamping plate member 114 is correspondingly provided with a plurality of guide portions 116, and the shape of the guide portion 116 and the guide cavity 115 are adapted, and the guide cavity 115 can guide the movement direction of the guide portion 116. And the plurality of guide portions 116 are installed in the plurality of guide cavities 115 one by one, and the plurality of springs 118 are used to apply force to the clamping plate at the same time, so that the lifting and lowering movement of the clamping plate is more stable, and the skewness of the clamping plate during movement is avoided, so that the pole ear can be reliably clamped and positioned.

[0056] In an optional solution of this embodiment, the clamping mechanism 102 also includes a button assembly 119; the button assembly 119 is installed between the clamp cover 111 and the elastic clamp 112 to keep the elastic clamp 112 away from the clamp and can lock and unlock the position of the elastic clamp 112.

[0057] In this embodiment, after the battery 104 to be tested is placed on the supporting surface 106, the tab needs to be placed between the clamp cover 111 and the elastic clamp 112. The elastic clamp 112 is always in a state of being close to the clamp cover 111 under the action of elastic force. In order to facilitate the placement of the tab between the clamp cover 111 and the elastic clamp 112, the button assembly 119 can be pressed to keep the elastic clamp 112 away from the clamp and locked in position. After the pole piece is placed between the clamp cover 111 and the elastic clamp 112, the button assembly 119 is pressed to unlock the elastic clamp 112, and the elastic clamp 112 can clamp the tab in position. The structural principle of the button assembly 119 is the same as that of the push pen, which will not be repeated here.

[0058] In the optional solution of this embodiment, the fixing mechanism includes a fixing member 120, and the test head 105 is installed on the fixing member 120; the clamp upper cover 111 is provided with a second guide rail, and the guiding direction of the second guide rail is the length direction of the pole ear; the fixing member 120 is slidably installed on the second guide rail; the fixing member 120 is provided with a third guide rail, and the guiding direction of the third guide rail is the width direction of the pole ear; the test head 105 is slidably installed on the third guide rail. In this way, the test head 105 can move in two directions perpendicular to each other on the plane where the pole ear surface is located, and the position of the test head 105 can be accurately adjusted.

[0059] In this embodiment, if Figure 3 As shown, the fixing member 120 is provided with an oblong mounting hole 121 to form a third track, and the test head 105 can be inserted into the mounting hole 121 from the upper end of the mounting hole 121, and the test end at the lower part of the test head 105 passes through the mounting hole 121 and contacts the surface of the pole lug. The test head 105 reciprocates along the length direction of the mounting hole 121, and the position of the test head 105 can be adjusted. A lap platform is provided in the mounting hole 121, and the positioning plate provided on the test head 105 can be lapped on the lap platform, which can realize the supporting effect on the test head 105 without affecting the sliding of the test head 105.

[0060] In an optional solution of this embodiment, the clamp cover 111 includes a connecting portion 122 and a clamping portion, and the connecting portion 122 is connected to the clamp base 110. The clamping portion includes a guide member 123 and two pressure plates 124 arranged at intervals, and one end of the two pressure plates 124 is integrally connected to the connecting portion 122 to form a cantilever structure. The guide member 123 is arranged at intervals from the connecting portion 122, and the two ends of the guide member 123 are respectively bolted to the other ends of the two pressure plates 124 to enclose a clamping area of ​​the clamp cover 111. The bottom surface of the guide member 123 is flush with the bottom surfaces of the two pressure plates 124, thereby forming a clamping surface. The middle space formed by the connecting portion 122, the two pressure plates 124 and the guide member 123 is the adjustment space of the fixing member 120.

[0061] The second guide rail includes a guide groove 125 provided in the connection part 122 and a guide through hole 126 provided in the guide member 123. The connection part 122 is provided with a guide groove 125, and a guide block is provided at one end of the fixing member 120, which is adapted to be installed in the guide groove 125 and can slide along the guide groove 125. The guide through hole 126 provided in the guide member 123 has a length direction consistent with the length direction of the guide groove 125. Two guide blocks are provided at the other end of the fixing member 120, and the two guide blocks and the upper hole wall of the guide through hole 126 are engaged with each other, and the guide blocks can slide along the guide through hole 126, which can achieve a guiding effect and make the connection more reliable.

[0062] like Figure 3 As shown, the guide member 123 is also provided with a plurality of connection holes 127 arranged at intervals to fix the position of the fixing member 120. Specifically, the position and number of the connection holes 127 can be set according to the specifications of the battery 104 to be tested. After the battery 104 to be tested is placed on the supporting surface 106, the fixing member 120 is installed at the corresponding connection hole 127, and the test head 105 is located in the middle position in the length direction of the pole piece, and there is no need to adjust the position of the test head 105, which is more convenient to operate.

[0063] Embodiment 2

[0064] The test positioning fixture in the second embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0065] In an optional solution of this embodiment, the substrate assembly 101 includes a first substrate 128 and a second substrate 129. One of the first substrate 128 and the second substrate 129 is provided with a guide rod 130, and the other is provided with a fourth guide rail, and the guide rod 130 is slidably mounted on the fourth guide rail, so that the first substrate 128 and the second substrate 129 are combined to form a supporting surface 106 with different areas. Figure 4 As shown, three guide rods 130 are provided on both sides and the middle of the first substrate 128, two guide grooves are correspondingly provided on both sides of the second substrate 129, and a guide hole is correspondingly provided in the middle of the second substrate 129. The guide rods 130 are correspondingly inserted into the guide grooves and the guide holes, so that the substrate assembly 101 can be extended and retracted, thereby changing the size of the supporting surface 106 to be suitable for batteries 104 under test of different sizes.

[0066] Embodiment 3

[0067] Embodiment 3 of the present application provides a testing device, including an internal resistance tester 103 and a testing positioning fixture of any of the above embodiments, and thus has all the beneficial technical effects of the testing positioning fixture of any of the above embodiments, which will not be described in detail herein.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A positioning fixture for testing, characterized in that: It includes a base assembly, a clamping mechanism and a fixing mechanism; The base assembly is provided with a supporting surface for placing the battery to be tested; The clamping mechanism is installed on the base assembly to clamp the tab of the battery under test; The fixing mechanism is used to fix the test head of the internal resistance tester, and the fixing mechanism is movably mounted on the clamping mechanism so that the test head corresponds to the measured position of the tab.

2. The test positioning fixture according to claim 1, characterized in that: The clamping mechanism corresponds one-to-one to the tabs of the battery under test; The base assembly is provided with a first guide rail, the guiding direction of the first guide rail is the length direction of the tab lead-out surface of the battery under test; the clamping mechanism is slidably mounted on the first guide rail.

3. The test positioning fixture according to claim 1, characterized in that: The clamping mechanism is provided with a first abutting surface, and the tab lead-out surface of the battery under test is in contact with the first abutting surface; And / or the base assembly is provided with a second abutment surface, and the side wall surface of the battery under test is in contact with the second abutment surface.

4. The test positioning fixture according to claim 1, characterized in that: The clamping mechanism comprises a clamp base, a clamp upper cover and an elastic clamping plate; The clamp base is mounted on the base assembly, the clamp upper cover is connected to the clamp base, and the fixing mechanism is movably mounted on the clamp upper cover; The elastic clamp is installed on the clamp base, and the clamping position of the elastic clamp is opposite to the clamping position of the clamp cover; the elastic clamp has a tendency to approach the clamp cover.

5. The test positioning fixture according to claim 4, characterized in that: The elastic splint comprises an elastic member and a splint member; The fixture base is provided with a guide cavity, and the elastic member is installed in the guide cavity; The clamping plate is provided with a guide portion, which extends into the guide cavity and abuts against the elastic member.

6. The test positioning fixture according to claim 4, characterized in that: The clamping mechanism also includes a button assembly; The button assembly is installed between the clamp upper cover and the elastic clamping plate to keep the elastic clamping plate away from the clamp and can lock and unlock the position of the elastic clamping plate.

7. The test positioning fixture according to claim 4, characterized in that: The fixing mechanism comprises a fixing member; The test head is mounted on the fixing member; the upper cover of the fixture is provided with a second guide rail, the guiding direction of the second guide rail is the length direction of the tab; the fixing member is slidably mounted on the second guide rail; The fixing member is provided with a third guide rail, the guiding direction of the third guide rail is the width direction of the tab; the test head is slidably mounted on the third guide rail.

8. The test positioning fixture according to claim 7, characterized in that: The clamp upper cover comprises a connecting portion and a clamping portion; The connecting part is connected to the clamp base; the clamping part includes a guide and two spaced-apart pressing plates; one end of the two pressing plates is connected to the connecting part; the guide is spaced-apart from the connecting part, and the two ends of the guide are respectively connected to the other ends of the two pressing plates to enclose a clamping area forming the clamp upper cover; the bottom surface of the guide is flush with the bottom surfaces of the two pressing plates; The second guide rail includes a guide groove formed in the connecting portion and a guide through hole formed in the guide member, and two ends of the fixing member are slidably mounted in the guide groove and the guide through hole respectively.

9. The test positioning fixture according to claim 1, characterized in that: The substrate assembly includes a first substrate and a second substrate; One of the first base and the second base is provided with a guide rod, and the other is provided with a fourth guide rail, and the guide rod is slidably mounted on the fourth guide rail, so that the first base and the second base are combined to form the supporting surfaces with different areas.

10. A testing device, characterized in that: The invention comprises an internal resistance tester and a testing positioning fixture as claimed in any one of claims 1 to 9.

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