Test tool for short circuit test of cylindrical battery

Abstract

The utility model provides a test tool used for a cylindrical battery short circuit test, and the test tool used for the cylindrical battery short circuit test comprises a pedestal, one side of which is provided with an arc-shaped first groove, and the first groove is suitable for accommodating a part of the periphery of a cylindrical battery; the two first limiting pieces are distributed in a spaced mode in the second direction and can move relatively so as to adjust the width of the first groove; the two second limiting pieces are distributed at intervals in the first direction and can move relatively so as to adjust the length of the first groove; and the electric connection assembly is arranged on the second limiting piece and comprises a first electric connection piece and a second electric connection piece, the first electric connection piece is suitable for being electrically connected with the cylindrical battery, and the second electric connection piece is suitable for being electrically connected with an external circuit. The test tool provided by the utility model can be suitable for cylindrical batteries of various sizes, and can facilitate the installation of the cylindrical batteries.

Description

Technical Field

[0001] The utility model relates to the field of new energy battery testing, and more specifically, to a testing tool for short-circuit testing of cylindrical batteries. Background Art

[0002] For battery testing, the internal short-circuit test of the battery is a mandatory test in the IEC 62619-2022 standard. In this test, after the battery cell is fully charged, the outer shell is removed, and a nickel particle with a height of 0.2 mm is implanted inside it. By externally squeezing the side (maximum 900 N), the nickel particle penetrates the separator, thereby short-circuiting the battery. This test basically does not require a fixture in the testing of square batteries, but when testing cylindrical batteries, the battery is prone to slip when squeezing the side of the battery; moreover, the internal tab of the battery cell is in a flattened state, which is not convenient for voltage sampling; it takes a lot of time to install the cylindrical battery on the testing equipment, and there is a time limit between disassembling the outer shell of the battery and the test. Now, a fixture tool for internal short-circuit testing of cylindrical batteries is needed. Summary of the Utility Model

[0003] The utility model provides a new technical solution for a testing tool for short-circuit testing of cylindrical batteries, which can be used for internal short-circuit testing of cylindrical batteries.

[0004] According to a testing tool for short-circuit testing of cylindrical batteries provided by the utility model, it includes: a base, one side of the base has an arc-shaped first groove, the length direction of the first groove is the first direction, the width direction of the first groove is the second direction, the thickness direction of the base is the third direction, and the first groove is adapted to accommodate a part of the outer circumference of the cylindrical battery; two first limit members, the two first limit members are spaced apart along the second direction and are relatively movable to adjust the width of the first groove; two second limit members, the two second limit members are spaced apart along the first direction and are relatively movable to adjust the length of the first groove; an electrical connection assembly, the electrical connection assembly is arranged on the second limit member, and the electrical connection assembly includes a first electrical connector and a second electrical connector, the first electrical connector is adapted to be electrically connected to the cylindrical battery, and the second electrical connector is adapted to be electrically connected to an external circuit.

[0005] Optionally, the base is a bakelite material part.

[0006] Optionally, one side of the base has a second groove, the second groove extends along the second direction, one end of the second groove communicates with the first groove, and the other end of the second groove extends in a direction away from the first groove, and at least one of the first limit members is installed in the second groove.

[0007] Optionally, at least one of the first limiting members has a mounting hole, and the bottom wall of the second groove has a limiting hole. The depth directions of the mounting hole and the limiting hole are both the third direction. The test tooling further includes: a first locking member, one end of which passes through the mounting hole and extends into the limiting hole.

[0008] Optionally, the mounting hole is a long strip-shaped hole, and the length direction is the second direction. In the second direction, the position of the first locking member in the mounting hole is adjustable.

[0009] Optionally, at least one of the second limiting members is located in the first groove.

[0010] Optionally, the surface of the second limiting member located in the first groove fits with the bottom wall of the first groove.

[0011] Optionally, a first through hole is provided on the base, and the depth direction of the first through hole is the third direction. The first through hole is long strip-shaped and the length direction is the first direction. The test tooling further includes: a second locking member, one end of which passes through the first through hole from the other side of the base to connect the second limiting member.

[0012] Optionally, the shape of the first electrical connector is disc-shaped.

[0013] Optionally, a second through hole extending along the first direction is provided on the second limiting member. The second through hole includes a first hole section and a second hole section that are communicated with each other. The diameter of the first hole section is larger than that of the second hole section. The electrical connection assembly further includes a connecting member that extends along the first direction. The connecting member includes: a first connecting portion, one end of which is connected to the first electrical connector, and the radial dimension of the first connecting portion is smaller than the radial dimension of the first electrical connector; a second connecting portion, one end of which is connected to the other end of the first connecting portion, and the radial dimension of the second connecting portion is smaller than the radial dimension of the first connecting portion. The test tooling further includes: an elastic member that is located in the first hole section and extends along the first direction, and the elastic member connects the bottom wall of the first hole section and the other end of the first connecting portion.

[0014] According to the test tooling for short-circuit testing of cylindrical batteries in the embodiments of the present invention, by combining a base, two first limiting members, two second limiting members and an electrical connection assembly, not only can the testing of cylindrical batteries be realized; but also by providing an arc-shaped first groove on the base, it is convenient to place the cylindrical batteries; and it can also be applicable to the testing of cylindrical batteries with various diameters and lengths.

[0015] Other features and advantages of the present utility model will become apparent from the following detailed description of exemplary embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0016] The drawings incorporated in and forming a part of this specification illustrate embodiments of the present utility model and, together with the description thereof, are used to explain the principles of the present utility model.

[0017] Figure 1 is a schematic structural view of a test fixture for short - circuit testing of cylindrical batteries according to an embodiment of the present utility model;

[0018] Figure 2 is a top view of a test fixture for short - circuit testing of cylindrical batteries according to an embodiment of the present utility model;

[0019] Figure 3 is a bottom view of a test fixture for short - circuit testing of cylindrical batteries according to an embodiment of the present utility model;

[0020] Figure 4 is a partial perspective view of a test fixture for short - circuit testing of cylindrical batteries according to an embodiment of the present utility model;

[0021] Figure 5 is an assembly schematic view of a test fixture for short - circuit testing of cylindrical batteries and a cylindrical battery according to an embodiment of the present utility model.

[0022] Reference Numerals:

[0023] Test fixture 100 for short - circuit testing of cylindrical battery 200;

[0024] Base 1; First groove 11; Second groove 12; Limit hole 13; First through - hole 14;

[0025] First limiting member 2; Mounting hole 21;

[0026] Second limiting member 3; Second through - hole 31; First hole section 311; Second hole section 312;

[0027] Electric connection assembly 4; First electric connector 41; Second electric connector 42;

[0028] First locking member 5;

[0029] Second locking member 6;

[0030] Connector 7; First connection portion 71; Second connection portion 72;

[0031] Elastic member 8;

[0032] Cylindrical battery 200. Detailed Implementation Modes

[0033] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model or its application or use.

[0035] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification.

[0036] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] The test tooling 100 for short - circuit testing of a cylindrical battery 200 according to an embodiment of the present utility model will be specifically described below in conjunction with the accompanying drawings.

[0039] As Figures 1 to 5 shown, the test tooling 100 for short - circuit testing of a cylindrical battery 200 according to an embodiment of the present utility model includes: a base 1, two first limiting members 2, two second limiting members 3, and an electrical connection assembly 4.

[0040] Specifically, one side of the base 1 has an arc-shaped first groove 11. For example, the upper surface of the base 1 has an arc-shaped first groove 11. The length direction of the first groove 11 is the first direction, the width direction of the first groove 11 is the second direction, the thickness direction of the base 1 is the third direction, and the depth direction of the arc-shaped first groove 11 is also the third direction. The first groove 11 is adapted to accommodate a part of the outer circumference of the cylindrical battery 200. The two first limit members 2 are spaced apart in the second direction and are relatively movable to adjust the width of the first groove 11, so as to be applicable to cylindrical batteries 200 with various radial dimensions. The two second limit members 3 are spaced apart in the first direction and are relatively movable to adjust the length of the first groove 11, so as to be applicable to cylindrical batteries 200 with various length dimensions. The electrical connection assembly 4 is disposed on the second limit member 3. The electrical connection assembly 4 includes a first electrical connector 41 and a second electrical connector 42. The first electrical connector 41 is adapted to electrically connect the cylindrical battery 200, and the second electrical connector 42 is adapted to electrically connect to an external circuit to realize the test of the cylindrical battery 200. The two first limit members 2 can form a radial limit structure for the cylindrical battery 200. Optionally, the number of the limit structures formed by the two first limit members 2 can be multiple groups, and the multiple groups are spaced apart in the first direction, so as to realize the freedom degree limitation of multiple positions of the cylindrical battery 200.

[0041] In other words, the test tooling 100 for short-circuit testing of the cylindrical battery 200 according to the embodiment of the present invention mainly consists of a base 1, two first limit members 2, two second limit members 3, and an electrical connection assembly 4. The base 1 can provide installation support for the first limit members 2, the second limit members 3, and the electrical connection assembly 4, and can play a role in carrying the cylindrical battery 200.

[0042] One side of the base 1 has an arc-shaped first groove 11. For example, the upper surface of the base 1 is provided with an arc-shaped first groove 11. The opening of the first groove 11 faces upward. The length direction of the first groove 11 is the first direction, the width direction of the first groove 11 is the second direction, and the depth direction of the first groove 11 is the third direction. By adopting the arc-shaped first groove 11, when the cylindrical battery 200 is installed in the first groove 11, the contact area between the inner wall surface of the first groove 11 and the outer circumference of the cylindrical battery 200 can be enlarged, and the uniformity and stability of the force received by the cylindrical battery 200 can be improved. Among them, an included angle exists between any two of the first direction, the second direction, and the third direction. For example, any two of the first direction, the second direction, and the third direction are perpendicular to each other. For the convenience of description, the first direction can be defined as the X-axis direction, the second direction can be defined as the Y-axis direction, and the third direction can be defined as the Z-axis direction.

[0043] Moreover, two first limiting members 2 are provided on one side of the base 1. The two first limiting members 2 are spaced apart along the second direction and are relatively movable to adjust the width of the first groove 11, so as to be applicable to cylindrical batteries 200 with various diameters. For example, it can meet the tests of cylindrical batteries with diameters ranging from 18 mm to 46 mm and other diameters.

[0044] And, two second limiting members 3 are provided on one side of the base 1. The two second limiting members 3 are spaced apart along the first direction and are relatively movable to adjust the length of the first groove 11, so as to be applicable to cylindrical batteries 200 with various lengths. For example, it can meet the tests of cylindrical batteries with lengths within 1400 mm and various lengths.

[0045] In addition, an electrical connection component 4 is installed on the second limiting member 3. The electrical connection component 4 includes a first electrical connection member 41 and a second electrical connection member 42. The first electrical connection member 41 is adapted to electrically connect the cylindrical battery 200, and the second electrical connection member 42 is adapted to electrically connect to an external circuit. For example, the second electrical connection member 42 is a metal pole column and can be externally connected to a voltage sampling device.

[0046] In this embodiment, by combining the base 1, two first limiting members 2, two second limiting members 3 and the electrical connection component 4, not only can the test of the cylindrical battery 200 be realized; moreover, by providing the arc-shaped first groove 11 on the base 1, it is convenient to place the cylindrical battery 200; and it can also be applicable to the tests of cylindrical batteries 200 with various diameters and lengths.

[0047] According to an embodiment of the present invention, the base 1 is a bakelite material part. That is to say, the base 1 is made of bakelite material, which can prevent other short circuits during the test. The base 1 of this embodiment has high mechanical strength, can withstand a pressure of up to 900 N, and is more resistant to electrolyte corrosion. Optionally, at least one of the first limiting member 2 and the second limiting member 3 is made of bakelite material part, which can achieve insulation, has high structural strength, and is more resistant to electrolyte corrosion.

[0048] In some specific embodiments of the present invention, one side of the base 1 has a second groove 12. For example, the upper surface of the base 1 has the second groove 12. The second groove 12 extends along the second direction. For example, the length direction of the first groove 12 is the left-right direction, and the length direction of the second groove 12 is the front-back direction. One end of the second groove 12 communicates with the first groove 11, and the other end of the second groove 12 extends in a direction away from the first groove 11. At least one first limiting member 2 is installed in the second groove 12. For example, the lower end of the first limiting member 2 extends into the second groove 12. In this embodiment, by defining that at least one first limiting member 2 is installed in the second groove 12, the side wall of the second groove 12 can limit the moving direction of the first limiting member 2 and play a guiding role.

[0049] According to an embodiment of the present utility model, at least one first limiting member 2 is provided with a mounting hole 21, and the bottom wall of the second groove 12 is provided with a limiting hole 13. The depth directions of the mounting hole 21 and the limiting hole 13 are both the third direction. For example, both the mounting hole 21 and the limiting hole 13 extend in the up and down direction. The test tooling 100 further includes: a first locking member 5, and one end of the first locking member 5 passes through the mounting hole 21 and then extends into the limiting hole 13. For example, during installation, the lower end of the first locking member 5 extends downward and passes through the mounting hole 21 and then extends into the limiting hole 13. In this embodiment, the relative position relationship between the first limiting member 2 and the base 1 can be defined by the first locking member 5, avoiding displacement of the first limiting member 2 during the working process; and, through the mutual cooperation of the first locking member 5, the mounting hole 21 and the limiting hole 13, the limiting structure can be prevented from being too complex, and the operation convenience and appearance aesthetics can be improved. Optionally, the upper end of the first locking member 5 has a larger size and is polygonal, which is convenient for the user to operate.

[0050] In some specific embodiments of the present utility model, the mounting hole 21 is a long strip hole, and the length direction is the second direction. In the second direction, the position of the first locking member 5 in the mounting hole 21 is adjustable. That is to say, the size of the part of the first locking member 5 inserted into the mounting hole 21 is smaller than the length of the mounting hole 21, and the first locking member 5 can move along the length direction of the mounting hole 21. The number of the limiting holes 13 can be multiple, so that after the first locking member 5 is adjusted to a preset position along the length direction of the mounting hole 21, the relative position between the first locking member 5 and the base 1 can be quickly fixed. Optionally, the limiting hole 13 is a screw hole, which improves the fixing rate of the first locking member 5.

[0051] According to an embodiment of the present utility model, at least one second limiting member 3 is located in the first groove 11. In this embodiment, the second limiting member 3 can be limited by the first groove 11.

[0052] In some specific embodiments of the present utility model, the surface of the second limiting member 3 located in the first groove 11 fits with the bottom wall of the first groove 11, which can improve the smoothness of the second limiting member 3 when moving along the inner wall of the first groove 11.

[0053] According to an embodiment of the present utility model, such as Figure 3As shown, a first through hole 14 is provided on the base 1. The depth direction of the first through hole 14 is the third direction. For example, a first through hole 14 that penetrates in the up and down direction is provided on the base 1. The first through hole 14 is elongated and its length direction is the first direction. The test tooling 100 further includes: a second locking member 6. One end of the second locking member 6 passes through the first through hole 14 from the other side of the base 1 and is connected to the second limiting member 3. For example, the second locking member 6 is a bolt. In this embodiment, the fixation between the base 1 and the second limiting member 3 can be achieved through the second locking member 6.

[0054] In some specific embodiments of the present utility model, the shape of the first electrical connector 41 is disc-shaped. For example, the first electrical connector 41 is a circular top plate with a diameter of 20 mm. In this embodiment, by adopting the disc-shaped first electrical connector 41, it can be ensured that the contact area between the first connector 41 and the cylindrical battery 200 is relatively large, and the flattened tab can be stably clamped. That is to say, the first electrical connector 41 can not only clamp the cylindrical battery 200, but also collect voltages, etc. at the same time.

[0055] Optionally, the first electrical connector 41 is a copper alloy part, which can ensure the stability of electrical connection.

[0056] According to an embodiment of the present utility model, as Figure 4 shown, a second through hole 31 extending in the first direction is provided on the second limiting member 3. The second through hole 31 includes a first hole section 311 and a second hole section 312 that communicate with each other. The diameter of the first hole section 311 is larger than that of the second hole section 312. The electrical connection assembly 4 further includes a connecting member 7. The connecting member 7 extends in the first direction. The connecting member 7 includes: a first connecting portion 71 and a second connecting portion 72. The test tooling 100 further includes an elastic member 8. Specifically, one end of the first connecting portion 71 is connected to the first electrical connector 41. The radial dimension of the first connecting portion 71 is smaller than the radial dimension of the first electrical connector 41. One end of the second connecting portion 72 is connected to the other end of the first connecting portion 71. The radial dimension of the second connecting portion 72 is smaller than the radial dimension of the first connecting portion 71. The elastic member 8 is located in the first hole section 311 and extends in the first direction. The elastic member 8 connects the bottom wall of the first hole section 311 and the other end of the first connecting portion 71. For example, the elastic member 8 is a spring and is sleeved on the outer periphery of the second connecting portion 72. The left end of the elastic member 8 is connected to the right end face of the first connecting portion 71, and the right end of the elastic member 8 is connected to the bottom wall of the first hole section 311.

[0057] In this embodiment, by adopting the elastic member 8, the elastic member 8 has the function of elastic contraction in the first direction, and it is convenient to install the cylindrical battery 200 by adopting the elastic member 8. Among them, the elastic member 9 is not limited to a spring.

[0058] The working process of the test tooling 100 for short - circuit testing of the cylindrical battery 200 according to the embodiments of the present utility model will be described in detail below in conjunction with specific embodiments.

[0059] Place the cylindrical battery 200 with a diameter of 32 mm and a length of 140 mm on the test tooling 100. The lower side surface of the cylindrical battery 200 is attached to the inner wall of the first groove 11 of the base 1. Fix the cylindrical battery 200 through the second limiting member 3 that can move to the right and the first limiting members 2 that can move in the front - back and left - right directions. Connect the sampling device to the cylindrical battery 200, and then the test can be started.

[0060] In summary, for the test tooling 100 for short - circuit testing of the cylindrical battery 200 according to the embodiments of the present utility model, by combining the base 1, two first limiting members 2, two second limiting members 3 and the electrical connection assembly 4, it can not only realize the testing of the cylindrical battery 200; moreover, by providing the arc - shaped first groove 11 on the base 1, it is convenient for the placement of the cylindrical battery 200; and it can also be applicable to the testing of cylindrical batteries 200 with various diameters and lengths.

[0061] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A test fixture (100) for short-circuit testing of a cylindrical battery (200), characterized in that: include: A base (1), one side of the base (1) having a first arc-shaped groove (11), the length direction of the first groove (11) being a first direction, the width direction of the first groove (11) being a second direction, the thickness direction of the base (1) being a third direction, the first groove (11) being suitable for accommodating a portion of the outer circumference of a cylindrical battery (200); Two first limiting members (2), the two first limiting members (2) being spaced apart and distributed along the second direction and movable relative to each other so as to adjust the width of the first groove (11); Two second limiting members (3), the two second limiting members (3) are spaced apart and distributed along the first direction and are relatively movable so as to adjust the length of the first groove (11); An electrical connection component (4), the electrical connection component (4) being arranged on the second limiting member (3), the electrical connection component (4) comprising a first electrical connection component (41) and a second electrical connection component (42), the first electrical connection component (41) being suitable for electrically connecting to the cylindrical battery (200), and the second electrical connection component (42) being suitable for electrically connecting to an external circuit.

2. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: The base (1) is a piece made of bakelite.

3. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: The base (1) has a second groove (12) on one side, the second groove (12) extends along the second direction, one end of the second groove (12) is connected to the first groove (11), the other end of the second groove (12) extends in a direction away from the first groove (11), and at least one of the first limiting members (2) is mounted in the second groove (12).

4. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 3, characterized in that: At least one of the first limiting members (2) has a mounting hole (21), the bottom wall of the second groove (12) has a limiting hole (13), the depth directions of the mounting hole (21) and the limiting hole (13) are both in the third direction, and the test fixture (100) further comprises: A first locking member (5), one end of which passes through the mounting hole (21) and then extends into the limiting hole (13).

5. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 4, characterized in that: The mounting hole (21) is an elongated hole, and the length direction is the second direction. In the second direction, the position of the first locking member (5) in the mounting hole (21) is adjustable.

6. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: At least one of the second limiting members (3) is located in the first groove (11).

7. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 6, characterized in that: The surface of the second limiting member (3) located in the first groove (11) is in contact with the bottom wall of the first groove (11).

8. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: The base (1) is provided with a first through hole (14), the depth direction of the first through hole (14) is the third direction, the first through hole (14) is in an elongated strip shape and the length direction is the first direction, and the test fixture (100) further comprises: A second locking member (6), one end of the second locking member (6) passes through the first through hole (14) from the other side of the base (1) to connect to the second limiting member (3).

9. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: The first electrical connector (41) is in the shape of a disc.

10. The test fixture (100) for short-circuit testing of cylindrical batteries (200) according to claim 1, characterized in that: The second stopper (3) is provided with a second through hole (31) extending along the first direction, the second through hole (31) comprising a first hole section (311) and a second hole section (312) which are connected to each other, the diameter of the first hole section (311) being greater than the diameter of the second hole section (312), the electrical connection assembly (4) further comprising a connecting member (7), the connecting member (7) extending along the first direction, the connecting member (7) comprising: A first connecting portion (71), one end of the first connecting portion (71) being connected to the first electrical connecting member (41), and a radial dimension of the first connecting portion (71) being smaller than a radial dimension of the first electrical connecting member (41); a second connecting portion (72), one end of the second connecting portion (72) being connected to the other end of the first connecting portion (71), and a radial dimension of the second connecting portion (72) being smaller than a radial dimension of the first connecting portion (71); The testing tool (100) further comprises: An elastic member (8), the elastic member (8) is located in the first hole section (311) and extends along the first direction, the elastic member (8) connects the bottom wall of the first hole section (311) and the other end of the first connecting portion (71).

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