Battery test fixture

Abstract

The utility model provides a battery test fixture, which is used for clamping a square battery and comprises a bearing part and a plurality of clamping parts, the square battery abuts against the bearing part, and the multiple clamping parts are arranged on the bearing part in a sliding mode and can jointly clamp a shell of the square battery in a releasable mode. According to the battery test fixture, the bearing part capable of supporting the square battery and the slidable clamping part are arranged, so that the battery test fixture can adapt to the square batteries with different boundary dimensions, the application range of the battery test fixture is enlarged, when the specification of the square battery is replaced, only the clamping part needs to be adjusted, the operation is simple, and the cost is low. And the production efficiency of the square battery cell can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a battery testing fixture. Background Art

[0002] With the continuous development of the new energy industry, batteries are gaining increasing attention as important energy storage and power supply devices. Prismatic batteries are particularly popular due to their safety, ease of integration, and long lifespan. Prismatic batteries are square-shaped batteries that typically consist of a positive electrode, a negative electrode, a separator, an electrolyte, and a square casing.

[0003] During the automated production process of square batteries, they need to be tested to ensure their safety. Square batteries are typically produced in a variety of sizes, so the dimensions of batteries of different sizes are also different. When testing square batteries, the fixtures of existing test equipment are not compatible with multiple sizes of square batteries at the same time. Consequently, when changing the size of the square battery to be tested, the corresponding test fixture must be replaced according to the size of the square battery. This replacement operation is complex and tedious, affecting production efficiency. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery testing fixture to improve the production efficiency of square batteries.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A battery testing fixture for clamping a square battery, comprising a carrying portion and a plurality of clamping portions;

[0007] The square battery abuts against the carrying portion, and the plurality of clamping portions are slidably arranged on the carrying portion and can jointly and releasably clamp the outer shell of the square battery.

[0008] Furthermore, the battery test fixture includes a driving portion and a transmission mechanism;

[0009] The driving portion is arranged on the carrying portion, and the transmission mechanism is arranged on the carrying portion along the circumference of the driving portion and can drive the clamping portion to move so as to clamp the square battery.

[0010] Furthermore, the transmission mechanism includes a screw rotatably connected to the bearing portion, each clamping portion is screwed to an independent screw, and the driving portion can drive the screw to rotate and drive the clamping portion to move along the axial direction of the screw.

[0011] Furthermore, the transmission mechanism includes a first gear and a second gear;

[0012] The driving part can drive the first gear to rotate, each of the screws is independently connected to a second gear, the second gear and the screw can rotate coaxially, the second gear meshes with the first gear, and the rotation axis of the first gear is perpendicular to the rotation axis of the second gear.

[0013] Furthermore, a clutch device is provided between the screw and the second gear, and the clutch device enables the screw and the second gear to rotate coaxially in a separable manner.

[0014] Furthermore, the clutch device includes a base portion and a clamping portion;

[0015] The base part is fixedly connected to the second gear, and the end of the screw rod is rotatably inserted into the base part; the clamping parts are provided in plurality and are slidably connected to the base part, and can clamp the screw rod along the radial direction of the screw rod.

[0016] Furthermore, the clutch device includes a telescopic portion, which is fixedly connected to the base portion, and the telescopic end of the telescopic portion can push the clamping portion toward the screw.

[0017] Furthermore, an elastic member is provided between the clamping portion and the base portion, and the elastic member can exert a force on the clamping portion to move away from the screw.

[0018] Further, the battery testing fixture includes a controller;

[0019] A pressure sensor is provided on the side of the clamping portion facing the square battery. The clutch device and the pressure sensor are electrically connected to the controller. After the clamping portion clamps the square battery, the pressure sensor sends an electrical signal to the controller. The controller controls the clutch device to separate the second gear and the screw.

[0020] Furthermore, the clamping portion includes at least two first clamping blocks, and the first clamping blocks can push against the planar side walls of the square battery housing.

[0021] Furthermore, the clamping portion includes at least two second clamping blocks, and the second clamping blocks can push against the positive corners of the side walls of the square battery housing.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The battery testing fixture described in the utility model can adapt to square batteries of different external sizes by providing a load-bearing part that can support square batteries and a slidable clamping part, thereby expanding the scope of application of the battery testing fixture. When changing the specifications of the square battery, it is only necessary to adjust the clamping part, which is simple to operate and can improve the production efficiency of square battery cells.

[0024] Secondly, the drive unit and transmission mechanism are provided, and the drive unit can control the movement of the clamping unit through the transmission mechanism, thereby improving the convenience of use of the battery test fixture. By providing a screw, when the drive unit drives the screw to rotate, the clamping unit can slide along the axial direction of the screw to clamp or loosen the square battery. By providing a first gear and a second gear between the drive unit and the screw, the power of the drive unit can be transmitted to the screw more stably, and it can also be achieved that one drive unit drives multiple screws to rotate.

[0025] Furthermore, a clutch device is provided between the screw and the second gear to disconnect the screw and the second gear when necessary, so that the screw does not rotate with the second gear, preventing the clamping portion from excessively squeezing the prismatic battery. By providing a clamping portion, when the clamping portion clamps the screw, the screw and the second gear can rotate synchronously. When the clamping portion disengages the screw, the screw can be released from its coaxial rotation relationship with the second gear. The provision of a telescopic portion can push the clamping portion toward the screw, thereby achieving clamping of the clamping portion.

[0026] In addition, the provision of an elastic member allows the pressing portion to disengage from the screw and reset when the telescopic portion contracts, without affecting the rotation of the second gear. When any clamping portion compresses the square battery, the corresponding pressure sensor will send an electrical signal, causing the corresponding screw to stop rotating, preventing the clamping portion from over-squeezing the square battery. The provision of a first clamping block can quickly and conveniently clamp the square battery. The provision of a second clamping block can clamp the positive corner side wall of the square battery, improving the clamping strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of the battery testing fixture described in the present utility model;

[0029] Figure 2 This is a schematic diagram of the internal structure of the bearing portion of the present invention;

[0030] Figure 3 This is a cross-sectional view of the battery testing fixture described in the present utility model;

[0031] Figure 4 for Figure 3 A partial enlarged view of part A in the middle;

[0032] Figure 5 This is a schematic cross-sectional structural diagram of the clutch device described in the present utility model.

[0033] Description of reference numerals:

[0034] 1. Load-bearing part;

[0035] 2. Clamping part;

[0036] 201, first clamping block; 202, second clamping block; 203, nut;

[0037] 3. Drive unit;

[0038] 4. Transmission mechanism;

[0039] 401, screw; 402, first gear; 403, second gear;

[0040] 5. Clutch device;

[0041] 501, base portion; 502, clamping portion; 5021, limiting portion; 503, telescopic portion; 5031, telescopic end; 504, elastic member;

[0042] 6. Controller;

[0043] 7. Pressure sensor;

[0044] 8. Battery;

[0045] 9. Base. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0048] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] This embodiment relates to a battery testing fixture to improve the production efficiency of square batteries.

[0051] In terms of overall structure, the battery testing fixture in this embodiment is used to clamp square batteries, and includes a carrying portion and a plurality of clamping portions.

[0052] The square battery abuts against the carrying portion, and a plurality of clamping portions are slidably arranged on the carrying portion and can jointly and releasably clamp the outer shell of the square battery.

[0053] As configured above, the battery testing fixture of this embodiment can adapt to square batteries of different dimensions by providing a bearing portion that can support square batteries and a slidable clamping portion, thereby increasing the scope of application of the battery testing fixture. When changing the specifications of the square battery, only the clamping portion needs to be adjusted, which is simple to operate and can improve the production efficiency of the square battery cells.

[0054] Based on the above overall introduction, refer to Figures 1 to 3 Specifically, the carrier portion 1 of this embodiment can be mounted on a prismatic battery testing device. After being clamped by the clamping portion 2, the prismatic battery is positioned at the center of the carrier portion 1. When testing a prismatic battery, the carrier portion 1 and the prismatic battery are mounted on the prismatic battery testing device for testing. The battery testing fixture is equipped with a base 9, onto which the carrier portion 1 can be mounted, facilitating assembly of the prismatic battery on the carrier portion 1.

[0055] Among them, regarding the specific structural form of the clamping part 2, the clamping part 2 of this embodiment includes at least two first clamping blocks 201, and the first clamping blocks 201 can push against the plane side walls of the square battery shell. In the process of clamping the square battery, the first clamping blocks 201 can assist in correcting the direction of the battery, and also have a good clamping effect, fixing the square battery on the supporting part 1. In this embodiment, there are four first clamping blocks 201, which are used to clamp the four side walls of the square battery respectively, and have a good clamping firmness.

[0056] Furthermore, the clamping portion 2 includes at least two second clamping blocks 202. The second clamping blocks 202 are capable of pushing against the outer corners of the side walls of the prismatic battery housing, which are the right-angled bends of the prismatic battery housing. The second clamping blocks 202 clamp the outer corners of the side walls of the prismatic battery housing, providing a better clamping effect. In this embodiment, four second clamping blocks 202 are also provided, clamping the prismatic battery at the four outer corners, providing a stable clamping effect.

[0057] It is understood that the number of the first clamping blocks 201 and the second clamping blocks 202 is adjustable, as long as the square battery does not shake or move after the first clamping blocks 201 and the second clamping blocks 202 clamp the square battery. It should also be explained that either the first clamping blocks 201 or the second clamping blocks 202 can be used, such as providing at least two first clamping blocks 201 or at least two second clamping blocks 202.

[0058] In addition, to facilitate the use of the battery test fixture, the battery test fixture includes a drive unit 3 and a transmission mechanism 4. The drive unit 3 is arranged on the load-bearing portion 1, and the transmission mechanism 4 is arranged on the load-bearing portion 1 along the circumference of the drive unit 3, and can drive the clamping portion 2 to move to clamp the square battery. The drive unit 3 and the transmission mechanism 4 are arranged, and the drive unit 3 can transmit power through the transmission mechanism 4, so that the clamping portion 2 moves to clamp or release the square battery. The drive unit 3 is arranged in the middle position inside the load-bearing portion 1, which can make the overall structure of the battery test fixture more compact.

[0059] Specifically, the transmission mechanism 4 includes a screw 401 rotatably connected to the bearing portion 1, and each clamping portion 2 is screwed to an independent screw 401. The driving portion 3 can drive the screw 401 to rotate and drive the clamping portion 2 to move along the axial direction of the screw 401. The first clamping block 201 and the second clamping block 202 are fixedly connected to a nut 203, and the nut 203 is screwed to the screw 401. The clamping portion 2 of this embodiment is divided into two types, one is a combination of the first clamping block 201 and the nut 203, and the other is a combination of the second clamping block 202 and the nut 203. The first clamping block 201 and the second clamping block 202 are both directional and reciprocating sliding forms. Therefore, when the screw 401 rotates, the clamping portion 2 can slide along the axial direction of the screw 401 to move closer to or away from the square battery. Of course, the transmission mechanism 4 can also adopt other transmission forms to move the clamping portion 2, such as a gear rack transmission structure or a sprocket chain structure, as long as the bidirectional movement and stop of the clamping portion 2 can be achieved.

[0060] For other structures of the transmission mechanism 4, the transmission mechanism 4 of this embodiment includes a first gear 402 and a second gear 403. The driving unit 3 can drive the first gear 402 to rotate, and each screw rod 401 is independently connected to a second gear 403. The second gear 403 and the screw rod 401 can rotate coaxially, and the second gear 403 engages the first gear 402, and the rotating shaft of the first gear 402 is perpendicular to the rotating shaft of the second gear 403. By arranging the first gear 402 and the second gear 403, it is possible to realize that one driving unit 3 drives all the screw rods 401 to rotate, and the structure is more concise. The driving unit 3 of this embodiment is a servo motor, and the output shaft of the servo motor is coaxially keyed to the first gear 402, and the first gear 402 is a bevel gear. The second gear 403 is also a bevel gear and engages the first gear 402. The first bevel gear is perpendicular to the axis of the second bevel gear, and the rotational torque of the driving unit 3 can be changed in direction and transmitted to the screw rod 401.

[0061] It should be noted that the first gear 402 can also be a crown gear, and the corresponding second gear 403 is a cylindrical gear. The rotating axes of the two are perpendicular to each other, and one first gear 402 can also engage and drive multiple second gears 403 to rotate. The driving part 3 can simultaneously drive each screw 401 to rotate.

[0062] Secondly, to prevent the clamping portion 2 from excessively squeezing the prismatic battery, a clutch device 5 is provided between the screw 401 and the second gear 403. The clutch device 5 allows the screw 401 and the second gear 403 to rotate coaxially and detachably. After the clamping portion 2 clamps the prismatic battery, the clutch device 5 disconnects the screw 401 from the second gear 403, preventing the screw 401 from rotating with the second gear 403 and thus preventing the clamping portion 2 from damaging the prismatic battery.

[0063] Accordingly, in order to achieve more accurate control of the clutch device 5, the battery test fixture includes a controller 6. A pressure sensor 7 is provided on the side of the clamping part 2 facing the square battery. The clutch device 5 and the pressure sensor 7 are electrically connected to the controller 6. After the clamping part 2 clamps the square battery, the pressure sensor 7 sends an electrical signal to the controller 6. The controller 6 controls the clutch device 5 to separate the second gear 403 and the screw 401. When the pressure between the clamping part 2 and the square battery reaches a predetermined value, the pressure sensor 7 can send an electrical signal to the controller 6. The controller 6 controls the clutch device 5 to separate, so that the coaxial rotation state of the screw 401 and the second gear 403 is cut off, so that the screw 401 stops rotating in time, protecting the square battery from being damaged by the clamping part 2. The pressure sensor 7 in this embodiment is a piezoelectric ceramic sensor. The piezoelectric ceramic sensor senses pressure by measuring the charge or potential change on the piezoelectric material caused by pressure, and has the advantages of fast response speed and high sensitivity. Of course, the pressure sensor 7 can also use other types of sensors, such as a resistive pressure sensor 7 or a capacitive pressure sensor 7.

[0064] Regarding the specific structure of the clutch device 5, refer to Figures 3 to 5 As shown, the clutch device 5 of this embodiment includes a base portion 501 and a clamping portion 502. The base portion 501 is fixedly connected to the second gear 403, and the end of the screw 401 is rotatably inserted into the base portion 501. One end of the screw 401 that passes through the base portion 501 is not provided with a thread, and a plurality of clamping portions 502 are provided, and are slidably connected to the base portion 501, and can clamp the end of the screw 401 that is not provided with a thread along the radial direction of the screw 401. Each screw 401 in this embodiment is correspondingly provided with four clamping portions 502, and the clamping portions 502 are evenly distributed around the circumference of the screw 401. After the screw 401 is clamped, the screw 401, the base portion 501, the second gear 403 and the pressing portion become a whole and can rotate synchronously.

[0065] Furthermore, the clutch device 5 also includes a telescopic portion 503, which is fixedly connected to the base portion 501. The telescopic end 5031 of the telescopic portion 503 can push the clamping portion 502 against the screw 401 to compress it. In this embodiment, the telescopic portion 503 is an electric push rod. Every two electric push rods form a group, and each group of electric push rods corresponds to a compression portion. The piston ends of the two electric push rods are connected to a common telescopic end 5031. By extending and retracting the electric push rod, the telescopic end 5031 can be moved radially in the screw 401, so that the compression portion compresses the screw 401. To power the electric push rod, a conductive slip ring is provided in the bearing portion 1. The electric slip ring is electrically connected to the electric push rod to provide power to the electric push rod when it rotates with the second gear 403.

[0066] In order to enable the clamping portion 502 to automatically reset, an elastic member 504 is provided between the clamping portion 502 and the base portion 501. The elastic member 504 can exert a force on the clamping portion 502 to move away from the screw 401. In this embodiment, the clamping portion 502 is a sphere, and a cylindrical concave surface is provided at one end facing the screw 401. The cylindrical concave surface is adapted to the end of the screw 401, which can increase the contact area of ​​the clamping portion 502 when pressing the screw 401, thereby achieving a better clamping effect. A limiting portion 5021 is formed on the outer wall of the clamping portion 502. The limiting portion 5021 is slidably arranged in the base portion 501, so that the clamping portion 502 can only move radially along the screw 401. The elastic member 504 is disposed between the stopper 5021 and the base 501, and is located on the side of the stopper 5021 facing the screw 401. The elastic member 504 is always under pressure, continuously applying force to the clamping portion 502 toward the screw 401. In this embodiment, two sets of elastic members 504 and stoppers 5021 are provided on either side of the clamping portion 502, ensuring more stable sliding of the clamping portion 502. The elastic member 504 can be a spring, an elastic metal sheet, or an elastic rubber block. In this embodiment, a spring is preferably used as the elastic member 504, as its elastic force is more stable.

[0067] In addition, refer to Figure 3 As shown, in order to facilitate the use of the battery test fixture of this embodiment, a battery 8 is provided on the base 9. After the supporting part 1 is assembled on the base 9, the battery 8 can supply power to the driving part 3 and the controller 6, and supply power to the telescopic part 503 through the conductive slip ring, so that the battery test fixture can be moved to any place for use without being restricted by power supply.

[0068] The battery test fixture of this embodiment, by providing a supporting portion 1 capable of supporting prismatic batteries and a slidable clamping portion 2, can accommodate prismatic batteries of varying dimensions, thus expanding the battery test fixture's applicability. Changing the size of a prismatic battery requires only adjusting the clamping portion 2, resulting in simple operation and improved production efficiency for prismatic cells. Furthermore, the provision of a clutch device 5, a controller 6, and a pressure sensor 7 enables automated operation of the battery test fixture, making it highly user-friendly.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery test fixture for holding a square battery, characterized in that: include: a bearing portion and a plurality of clamping portions; The square battery abuts against the carrying portion, and the plurality of clamping portions are slidably arranged on the carrying portion and can jointly and releasably clamp the outer shell of the square battery; The battery testing fixture includes a driving part and a transmission mechanism; The driving portion is arranged on the carrying portion, and the transmission mechanism is arranged on the carrying portion along the circumference of the driving portion and is capable of driving the clamping portion to move so as to clamp the square battery; The transmission mechanism includes a screw rotatably connected to the bearing portion, each of the clamping portions is screwed to an independent screw, and the driving portion can drive the screw to rotate and drive the clamping portion to move along the axial direction of the screw; The transmission mechanism includes a first gear and a second gear; The driving unit is capable of driving the first gear to rotate, each of the screws is independently connected to a second gear, the second gear and the screw are capable of coaxial rotation, the second gear meshes with the first gear, and the rotation axis of the first gear is perpendicular to the rotation axis of the second gear; A clutch device is provided between the screw and the second gear, and the clutch device enables the screw and the second gear to rotate detachably coaxially.

2. The battery test fixture according to claim 1, characterized in that: The clutch device includes a base portion and a clamping portion; The base part is fixedly connected to the second gear, and the end of the screw rod is rotatably inserted into the base part; the clamping parts are provided in plurality and are slidably connected to the base part, and can clamp the screw rod along the radial direction of the screw rod.

3. The battery test fixture according to claim 2, characterized in that: The clutch device includes a telescopic portion, which is fixed to the base portion. The telescopic end of the telescopic portion can push the clamping portion toward the screw.

4. The battery test fixture according to claim 3, wherein: An elastic member is provided between the clamping portion and the base portion, and the elastic member can apply a force to the clamping portion to move away from the screw.

5. The battery testing fixture according to claim 1, wherein: Including controller; A pressure sensor is provided on the side of the clamping portion facing the square battery. The clutch device and the pressure sensor are electrically connected to the controller. After the clamping portion clamps the square battery, the pressure sensor sends an electrical signal to the controller. The controller controls the clutch device to separate the second gear and the screw.

6. The battery testing fixture according to any one of claims 1 to 5, characterized in that: The clamping portion includes at least two first clamping blocks, and the first clamping blocks are capable of pushing against the plane side wall of the square battery housing; and / or, The clamping portion includes at least two second clamping blocks, and the second clamping blocks can push against the positive corners of the side walls of the square battery housing.

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