Pressure testing mechanism and pressure testing device

Abstract

The utility model relates to the technical field of battery cell pressure testing, and provides a pressure testing mechanism and a pressure testing device, a base is provided with a plurality of placing positions along a first direction, and each placing position can be used for placing a battery cell; the multiple sets of clamping assemblies correspond to the multiple placement positions one to one, each clamping assembly comprises a driving part, a transfer case and two clamping parts, each transfer case comprises an input shaft and two output shafts in transmission connection with the input shaft, the driving parts can drive the input shafts, and the two output shafts are connected with the two clamping parts in a one-to-one correspondence mode; the driving mechanism can drive the two clamping pieces to get close to each other or get away from each other in the first direction so as to fix or release the battery cell; and the pressure sensor is clamped between the battery cell and the clamping piece and is used for acquiring a pressure value between the battery cell and the clamping piece. By means of the arrangement, the pressure testing device can contain the battery cells of different specifications at the same time, corresponding pressure testing is carried out on the battery cells of different specifications, the testing efficiency can be improved, and the testing quality can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pressure testing technology for battery cells, and in particular to a pressure testing mechanism and pressure testing device. Background Technology

[0002] The battery cell is the core component of a battery, and it needs to undergo pressure testing before leaving the factory. The testing device obtains the range of pressure values ​​that the cell can withstand by squeezing it. However, as the application scenarios of battery cells increase, their structural characteristics vary among different cell models. That is, different cell models have different thicknesses. When performing pressure tests on cells of different specifications, it is necessary to change the corresponding clamping components, resulting in low testing efficiency.

[0003] Some existing testing devices can test multiple battery cells simultaneously, but only for cells of the same specification and perform the same pressure test. They still cannot perform pressure tests on battery cells of different specifications at the same time.

[0004] Therefore, there is an urgent need for a pressure testing mechanism and pressure testing device to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a pressure testing mechanism and a pressure testing device that can simultaneously accommodate battery cells of different specifications and perform corresponding pressure tests on battery cells of different specifications.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Stress testing equipment, applicable to stress testing of battery cells, includes:

[0008] The base has multiple placement positions along the first direction, and each placement position can hold one of the battery cells.

[0009] The clamping assembly is provided in multiple sets, each corresponding to one of the multiple placement positions. The clamping assembly includes a drive unit, a transfer case, and two clamping members. The transfer case includes an input shaft and two output shafts that are driven to it. The drive unit can drive the input shaft. The two output shafts are connected to the two clamping members one by one, and can drive the two clamping members to move closer or further away from each other along the first direction to fix or release the battery cell.

[0010] A pressure sensor is clamped between the battery cell and the clamping member to obtain the pressure value between the battery cell and the clamping member.

[0011] As a preferred technical solution of the aforementioned pressure testing mechanism, the aforementioned clamping assembly further includes a pad, wherein two pads are provided, which are respectively placed on opposite sides of the aforementioned battery cell in the aforementioned first direction and clamped between the aforementioned battery cell and the aforementioned clamping member.

[0012] As a preferred technical solution of the aforementioned pressure testing mechanism, the base has a receiving cavity, and the top end face of the receiving cavity has a first sliding groove. The length direction of the first sliding groove is parallel to the first direction. The transfer cases are all installed in the receiving cavity. The placement position is formed on the side of the top end face facing away from the receiving cavity. The clamping part passes through the first sliding groove and is connected to the output shaft. The output shaft can drive the clamping part to move along the first direction.

[0013] As a preferred technical solution of the aforementioned pressure testing mechanism, the driving component is a handwheel, at least partially located outside the aforementioned accommodating cavity, the handwheel is coaxially arranged and fixed with the aforementioned input shaft, the aforementioned input shaft is rotatable relative to the aforementioned base, and the aforementioned input shaft engages with the aforementioned output shaft for transmission.

[0014] As a preferred technical solution of the aforementioned pressure testing mechanism, a bearing seat is fixed inside the aforementioned accommodating cavity, and the aforementioned output shaft is inserted into the aforementioned bearing seat.

[0015] As a preferred technical solution for the aforementioned pressure testing mechanism, the clamping component is provided with a hollow structure.

[0016] As a preferred technical solution of the aforementioned pressure testing mechanism, it also includes a guardrail, which is installed on the base and located on the side of the placement in the second direction. The length direction of the guardrail is parallel to the first direction, and the guardrail can abut against the battery cell in the second direction.

[0017] The second direction mentioned above is perpendicular to the first direction mentioned above.

[0018] As a preferred technical solution of the aforementioned pressure testing mechanism, the base is provided with a second sliding groove, the length direction of the second sliding groove is parallel to the second direction, and the guardrail portion is inserted into the second sliding groove, which can slide or lock relative to the base along the second sliding groove.

[0019] As a preferred technical solution of the aforementioned pressure testing mechanism, it further includes a self-locking component, which is capable of maintaining the contact force F between the clamping member and the battery cell, wherein the contact force F between the battery cell and the clamping member is greater than F. 阈 If the aforementioned self-locking component fails, the aforementioned clamping components can move away from each other.

[0020] A pressure testing apparatus is also provided, including the pressure testing mechanism described above.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a pressure testing mechanism suitable for pressure testing of battery cells. The pressure testing mechanism includes a base, clamping components, and a pressure sensor. The base has multiple placement positions along a first direction, each capable of holding one battery cell. Multiple clamping components are provided, each corresponding to one of the placement positions. Each clamping component includes a drive unit, a transfer case, and two clamping members. The transfer case includes an input shaft and two output shafts, each drive unit driving the input shaft. The two output shafts are connected to the two clamping members, enabling the two clamping members to move closer or further apart along the first direction to fix or release the battery cell. The pressure sensor is clamped between the battery cell and the clamping members to obtain the pressure value between them.

[0023] This configuration allows the pressure testing mechanism to accommodate multiple battery cells simultaneously, with each cell equipped with an independent clamping assembly. This clamping assembly applies pressure to its corresponding cell, and the applied pressure can be freely adjusted according to the cell's testing requirements; that is, the multiple clamping assemblies do not interfere with each other. Furthermore, because the gap between two clamping components is adjustable, the pressure testing mechanism can simultaneously accommodate battery cells of different specifications and perform corresponding pressure tests on cells of different specifications, thereby improving testing efficiency while ensuring testing quality. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram of the pressure testing mechanism (partial sidewall of the hidden base) provided in an embodiment of this utility model;

[0026] Figure 2 This is a front view of the pressure testing mechanism (partial side wall of the hidden base) provided in this embodiment of the utility model;

[0027] Figure 3 This is a side view of the pressure testing mechanism (partial side wall of the hidden base) provided in this embodiment of the utility model;

[0028] Figure 4 This is a bottom view of the pressure testing mechanism (partial side wall of the hidden base) provided in this embodiment of the utility model;

[0029] Figure 5 This is a top view of the pressure testing mechanism (hidden clamping component) provided in this embodiment of the utility model.

[0030] In the picture:

[0031] X, first direction; Y, second direction; Z, third direction;

[0032] 1. Pressure testing mechanism; 2. Battery cell;

[0033] 100, base; 110, receiving cavity; 120, first slide groove; 130, bearing seat; 140, second slide groove;

[0034] 200 Clamping assembly; 220 Transfer case; 221 Input shaft; 222 Output shaft; 230 Clamping element; 231 Hollowed-out structure; 240 Backing plate; 250 Handwheel;

[0035] 300. Guardrail; 310. Interception section; 320. Connecting section. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] like Figures 1 to 5 As shown, this utility model provides a pressure testing mechanism 1, suitable for pressure testing of a battery cell 2. The pressure testing mechanism 1 includes a base 100, a clamping assembly 200, and a pressure sensor. The base 100 has multiple placement positions along a first direction X, each capable of holding one battery cell 2. Multiple sets of clamping assemblies 200 are provided, each corresponding to one of the placement positions. Each clamping assembly 200 includes a drive component, a transfer case 220, and two clamping members 230. The transfer case 220 includes an input shaft 221 and two output shafts 222, each driveably connected to the input shaft 221. The drive component drives the input shaft 221, and the two output shafts 222 are connected to the two clamping members 230, respectively, driving the two clamping members 230 to move closer or further apart along the first direction X to fix or release the battery cell 2. The pressure sensor is clamped between the battery cell 2 and the clamping member 230 to obtain the pressure value between the battery cell 2 and the clamping member 230.

[0041] This configuration allows the pressure testing mechanism 1 to simultaneously accommodate multiple battery cells 2 at multiple placement positions. Each battery cell 2 is equipped with an independent clamping component 200, which can apply pressure to its corresponding battery cell 2. The applied pressure can be freely adjusted according to the testing requirements of the battery cell 2, meaning that the multiple clamping components 200 do not interfere with each other. Furthermore, since the gap between two clamping components 230 is adjustable, the pressure testing mechanism 1 can simultaneously accommodate battery cells 2 of different specifications and perform corresponding pressure tests on battery cells 2 of different specifications, thereby improving testing efficiency and ensuring testing quality.

[0042] For example, the transfer case 220 includes an input shaft 221 and two output shafts 222. One axial end of the input shaft 221 is connected to the output shaft of the drive member for transmission. The other axial end of the input shaft 221 is coaxially fixed with a drive gear. The axes of the two output shafts 222 are parallel to the first direction X and perpendicular to the axis of the input shaft 221. The two output shafts 222 are symmetrically arranged on both radial sides of the input shaft 221. One axial end of the output shaft 222 is coaxially fixed with a driven gear. The driven gear meshes with the drive gear and is a bevel gear. The other axial end of the output shaft 222 is threadedly connected to the clamping member 230. Thus, when the input shaft 221 rotates, the power is reversed through the meshing of the driving gear and the driven gear, causing the two output shafts 222 to rotate together. Since the output shafts 222 are threadedly connected to the clamping member 230, and part of the clamping member 230 abuts against the base 100, it cannot rotate with the output shafts 222, but moves axially along the output shafts 222, allowing the clamping members 230 to move closer or further apart. When the clamping members 230 move closer together, they clamp the battery cell 2; when they move further apart, the clamping members 230 release the battery cell 2.

[0043] For example, racks are mounted on one axial end of each of the two output shafts 222, and the other ends are fixed to a corresponding clamping member 230. The two output shafts 222 are symmetrically arranged on both radial sides of the input shaft 221. Gears are coaxially mounted on the input shaft 221, and the gears mesh with the racks on both sides. Thus, when the input shaft 221 rotates, the gear and rack transmission structure can convert the rotation of the input shaft 221 into linear movement along the first direction X, so that the two output shafts 222 can drive the corresponding clamping members 230 to move closer to or further away from each other.

[0044] Optionally, the clamping assembly 200 also includes a pad 240, which has two pads, respectively placed on opposite sides of the battery cell 2 in the first direction X, and clamped between the battery cell 2 and the clamping member 230.

[0045] For example, the contact area S1 between the pad 240 and the battery cell 2 satisfies S1≥S2. S2 is the contact area between the clamping member 230 and the battery cell 2 when they are in direct contact. According to the pressure calculation formula, P=F / S, where P is the pressure, F is the force, and S is the contact area, it can be seen that when the force F is constant, the larger the contact area S, the smaller the pressure P. In this way, the clamping member 230 can increase the contact area S through the pad 240, thereby reducing the pressure of the clamping member 230 on the battery cell 2, so that the battery cell 2 can be subjected to force evenly, and avoid local stress concentration in the battery cell 2.

[0046] Furthermore, the relative positional relationship between the pad 240 and the clamping member 230 can be adjusted according to the structure of the battery cell 2, so that the clamping member 230 can stably clamp the battery cell 2.

[0047] Optionally, the base 100 has a receiving cavity 110, and the top end face of the receiving cavity 110 has a first sliding groove 120. The length direction of the first sliding groove 120 is parallel to the first direction X. The transfer case 220 is installed in the receiving cavity 110, and the placement position is formed on the side of the top end face facing away from the receiving cavity 110. The clamping member 230 partially passes through the first sliding groove 120 and is connected to the output shaft 222. The output shaft 222 can drive the clamping member 230 to move along the first direction X.

[0048] By placing the transfer case 220 inside the accommodating cavity 110, the transmission mechanism can be prevented from being exposed, thus ensuring a clean appearance of the device while protecting the transmission mechanism.

[0049] Furthermore, two parallel first slide grooves 120 are provided, and clamping members 230 are respectively inserted into the two first slide grooves 120 to maintain the stability of the clamping members 230.

[0050] Optionally, the driving component is a handwheel 250, which is at least partially located outside the receiving cavity 110. The handwheel 250 is coaxially arranged and fixed with the input shaft 221, which can rotate relative to the base 100. The input shaft 221 engages with the output shaft 222 for transmission. With this configuration, the user can simultaneously drive the two output shafts 222 to rotate by turning the handwheel 250, thereby allowing the two clamping members 230 to move closer or further apart.

[0051] Optionally, a bearing housing 130 is fixed inside the accommodating cavity 110, and the output shaft 222 is inserted into the bearing housing 130. For example, the bearing housing 130 is located between the housing of the transfer case 220 and the handwheel 250, thus providing a fulcrum for the input shaft 221 of the transfer case 220, reducing the sway of the input shaft 221, and improving transmission efficiency and transmission stability.

[0052] Optionally, the clamping member 230 is provided with a hollow structure 231.

[0053] For example, the clamping member 230 has a weight-reducing hole along the first direction X. This configuration can reduce the weight of the clamping member 230 itself, making it easier for the driving member to drive the clamping member 230 to move along the first direction X, and reducing the output power requirements of the driving member.

[0054] Optionally, the pressure testing mechanism 1 also includes a guardrail 300, which is mounted on the base 100 and located on the side placed in the second direction Y. The length direction of the guardrail 300 is parallel to the first direction X, and the guardrail 300 can abut against the battery cell 2 in the second direction Y. The second direction Y is perpendicular to the first direction X.

[0055] For example, the guardrail 300 includes a connecting portion 320 and an intercepting portion 310. The length direction of the intercepting portion 310 is parallel to the first direction X, and it is used to abut against the battery cell 2 in the second direction Y. The intercepting portion 310 and the base 100 are spaced apart in the third direction Z. The connecting portion 320 connects the intercepting portion 310 and the base 100. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. This prevents the battery cell 2 from falling along the second direction Y. Furthermore, the guardrail 300 can abut against multiple battery cells 2 in the second direction Y, so that the multiple battery cells 2 are aligned in the second direction Y.

[0056] Optionally, the base 100 has a second slide groove 140, the length direction of the second slide groove 140 is parallel to the second direction Y, and the guardrail 300 is partially inserted into the second slide groove 140, and can slide or lock relative to the base 100 along the second slide groove 140.

[0057] For example, the connecting part 320 of the guardrail 300 is inserted into the second slide groove 140 and can move or lock relative to the base 100 in the second direction Y, so as to accommodate different types of battery cells 2.

[0058] Optionally, the pressure testing mechanism 1 also includes a self-locking component, which can maintain the contact force F between the clamping member 230 and the battery cell 2, wherein the contact force F between the battery cell 2 and the clamping member 230 is greater than F. 阈 If the self-locking component fails, the clamping parts 230 can move away from each other.

[0059] For example, the self-locking assembly includes a ratchet, a limiting member, and an elastic member. The ratchet is coaxially fixed to the input shaft 221. The limiting member is rotatably connected to the base 100. The rotation axis of the limiting member is parallel to the second direction Y. The limiting member includes a first dial and a second dial. The first dial is used to engage with the ratchet to prevent the ratchet from rotating. The second dial is exposed outside the base 100. The user can disengage the first dial from the ratchet by turning the second dial. The elastic member ensures that the first dial is always in close contact with the ratchet.

[0060] Assume that when the input shaft 221 rotates clockwise, the ratchet can rotate relative to the limiting member, and the clamping members 230 can move closer together to apply pressure to the battery cell 2. During the test, the battery cell 2 exerts a reverse force on the clamping members 230, causing the output shaft 222 to tend to rotate counterclockwise. At this time, because the first shifter is inserted into the ratchet, it achieves self-locking, preventing the input shaft 221 from rotating counterclockwise. When it is necessary to release the battery cell 2, the second shifter is moved, causing the first shifter to disengage from the ratchet, allowing the input shaft 221 to rotate counterclockwise. Furthermore, when the battery cell 2 malfunctions during the test, the resisting force F exerted on the clamping members 230 is greater than F. 阈The first dial fails, and may be bent or deformed in other ways, releasing the lock of the input shaft 221 and allowing the clamping parts 230 to move away from each other.

[0061] For example, in other embodiments, the self-locking assembly may further include a brake torsion spring and a brake drum. During the rotation of the handwheel 250, the radial dimension of the brake torsion spring can be adjusted according to the rotation direction. When the brake torsion spring abuts against the brake drum and generates significant friction, self-locking is achieved. This is known technology and will not be described in detail here.

[0062] A pressure testing device is also provided, including the pressure testing mechanism 1 described above. Thus, the pressure testing device using the pressure testing mechanism 1 can simultaneously perform pressure tests on multiple battery cells 2, and can apply different forces to each battery cell 2. It can be adjusted specifically according to the testing requirements of different battery cells 2, thereby improving work efficiency and ensuring work quality.

[0063] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A pressure testing mechanism, suitable for pressure testing of battery cells (2), characterized in that, The pressure testing mechanism includes: A base (100) is provided with a plurality of placement positions along a first direction (X), each of the placement positions being capable of placing one of the battery cells (2); Clamping assembly (200), multiple sets of clamping assembly (200) are provided, each corresponding to one of the multiple placement positions. The clamping assembly (200) includes a drive unit, a transfer case (220) and two clamping members (230). The transfer case (220) includes an input shaft (221) and two output shafts (222) that are driven to it. The drive unit can drive the input shaft (221). The two output shafts (222) are connected to the two clamping members (230) one by one. The drive unit can drive the two clamping members (230) to move closer or further away from each other along the first direction (X) to fix or release the battery cell (2). A pressure sensor is clamped between the battery cell (2) and the clamping member (230) to obtain the pressure value between the battery cell (2) and the clamping member (230).

2. The pressure testing mechanism according to claim 1, characterized in that, The clamping assembly (200) further includes a pad (240), which has two pads, respectively placed on opposite sides of the battery cell (2) in the first direction (X), and clamped between the battery cell (2) and the clamping member (230).

3. The pressure testing mechanism according to claim 1, characterized in that, The base (100) has a receiving cavity (110) inside, and a first sliding groove (120) is formed on the top end face of the receiving cavity (110). The length direction of the first sliding groove (120) is parallel to the first direction (X). The transfer case (220) is installed in the receiving cavity (110). The placement position is formed on the side of the top end face that is away from the receiving cavity (110). The clamping member (230) partially passes through the first sliding groove (120) and is connected to the output shaft (222). The output shaft (222) can drive the clamping member (230) to move along the first direction (X).

4. The pressure testing mechanism according to claim 3, characterized in that, The driving component is a handwheel (250), which is at least partially located outside the accommodating cavity (110). The handwheel (250) is coaxially arranged and fixed with the input shaft (221). The input shaft (221) is rotatable relative to the base (100), and the input shaft (221) meshes with the output shaft (222) for transmission.

5. The pressure testing mechanism according to claim 4, characterized in that, A bearing seat (130) is fixed inside the accommodating cavity (110), and the output shaft (222) is inserted into the bearing seat (130).

6. The pressure testing mechanism according to claim 1, characterized in that, The clamping member (230) is provided with a hollow structure (231).

7. The pressure testing mechanism according to claim 1, characterized in that, It also includes a guardrail (300), which is installed on the base (100) and located on the side of the placement in the second direction (Y). The length direction of the guardrail (300) is parallel to the first direction (X), and the guardrail (300) can abut against the battery cell (2) in the second direction (Y). The second direction (Y) is perpendicular to the first direction (X).

8. The pressure testing mechanism according to claim 7, characterized in that, The base (100) has a second slide groove (140), the length direction of the second slide groove (140) is parallel to the second direction (Y), and the guardrail (300) is partially inserted into the second slide groove (140) and can slide or lock relative to the base (100) along the second slide groove (140).

9. The pressure testing mechanism according to claim 1, characterized in that, It also includes a self-locking component, which is capable of maintaining the contact force F between the clamping member (230) and the battery cell (2), wherein the contact force F between the battery cell (2) and the clamping member (230) is greater than F. 阈 If the self-locking component fails, the clamping members (230) can move away from each other.

10. A pressure testing device, characterized in that, Includes the pressure testing apparatus (1) as described in any one of claims 1-9.

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