Battery cell pressurizing device and battery cell testing equipment

Abstract

The application provides an electric core pressurizing device and an electric core testing equipment, and relates to the technical field of battery production. The electric core pressurizing device comprises a pressurizing assembly, and the pressurizing assembly comprises a capsule. The capsule is arranged on the side of the electric core to be pressurized. The capsule is configured to expand when fluid is filled, so as to be attached to the surface of the side of the electric core to be pressurized and abut against the surface of the side of the electric core to be pressurized. The electric core pressurizing device and the electric core testing equipment can be better attached to the surface of the electric core when pressure is applied to the electric core, the uniformity of pressure application is improved, and missed detection is avoided.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cell pressurization device and a cell testing equipment. Background Technology

[0002] Battery cells are the core component of rechargeable batteries, and their performance directly affects the battery's safety, energy density, and cycle life. During the manufacturing process, battery cells may experience short circuits due to internal defects (such as separator damage or electrode burrs) or external pressure. Short circuits not only degrade cell performance but can also trigger thermal runaway or even explosions. Therefore, battery cells must undergo rigorous short-circuit testing before leaving the factory to ensure their safety and reliability.

[0003] In related technologies, battery cell short-circuit testing equipment mainly uses mechanical pressure plates or servo pressure devices to apply pressure to the battery cell, and determines whether a short circuit exists by detecting changes in the resistance or voltage of the battery cell.

[0004] However, the aforementioned testing equipment has difficulty fully adhering to the surface of the battery cell when applying pressure, resulting in uneven pressure application and easy missed detections. Utility Model Content

[0005] This application provides a battery cell pressurization device and a battery cell testing equipment, which can better adhere to the surface of the battery cell when pressure is applied to the battery cell, improve the uniformity of pressure application, and avoid missed detection.

[0006] In a first aspect, this application provides a battery cell pressurization device, comprising:

[0007] A pressurization assembly includes a bladder for placement on the pressurized side of a battery cell, the bladder being configured to expand upon filling with fluid to conform to and abut against the surface of the pressurized side of the battery cell.

[0008] As an optional implementation, the pressurization assembly includes a connecting plate, which is disposed on the side of the capsule opposite to the battery cell, and the capsule is fixedly connected to the connecting plate.

[0009] As an optional implementation, the pressurization assembly includes a mounting bracket;

[0010] The connecting plate is detachably connected to the mounting bracket;

[0011] The number of connecting plates is multiple, and the multiple connecting plates are spaced apart along a first direction. A pressurized space is formed between two adjacent connecting plates, and the pressurized space is used to accommodate the battery cell.

[0012] There are multiple capsules, and each capsule is connected to the side of the connecting plate facing the pressurized space.

[0013] As an optional implementation, the cell pressurization device further includes a first limiting component;

[0014] The first limiting component is movably disposed on the mounting bracket, and the first limiting component is used to move closer to or further away from the bladder in the second direction;

[0015] When the first limiting component approaches the bladder, it abuts against the side of the bladder facing the second direction to limit the expansion range of the bladder in the second direction;

[0016] The second direction is perpendicular to the first direction.

[0017] As an optional implementation, the first limiting component includes:

[0018] The first connector is movably connected to the mounting bracket;

[0019] The first limiting member is connected to the first connecting member;

[0020] The first connector is used to drive the first limiting member to move along the second direction, and at least a portion of the first limiting member extends into the pressurized space and abuts against the bladder.

[0021] As an optional implementation, the cell pressurization device further includes a first drive assembly;

[0022] The first driving component includes:

[0023] The first driving component is connected to the mounting bracket;

[0024] A first push rod extends along the second direction, with a first end of the first push rod connected to the first driving member and a second end of the first push rod connected to the first limiting component;

[0025] The first driving member is used to drive the first limiting component to move along the second direction via the first push rod.

[0026] As an optional implementation, one of the mounting bracket and the connecting plate is provided with a sliding groove, and the other is provided with a sliding block;

[0027] One end of the slide has an opening, through which the slider enters the slide and can slide along the slide.

[0028] As an optional implementation, the cell pressurization device further includes a second limiting component;

[0029] The second limiting component is movably disposed on the mounting bracket, and the second limiting component is used to move toward or away from the capsule in a third direction;

[0030] When the second limiting component approaches the capsule, it abuts against the side of the capsule facing the third direction to limit the expansion range of the capsule in the third direction;

[0031] The third direction is perpendicular to the first direction.

[0032] Secondly, this application provides a battery cell testing device, including a mounting base, a testing component, and a battery cell pressurization device of any one of the above.

[0033] Both the cell pressurization device and the test component are mounted on the mounting base. The test component is used to perform short-circuit tests on the cells mounted in the cell pressurization device.

[0034] As an optional implementation, the test assembly includes a positive electrode test assembly and a negative electrode test assembly;

[0035] The positive electrode testing assembly includes a positive electrode detection element that can move along the second direction, the positive electrode detection element being used to contact the positive electrode post of the battery cell;

[0036] The negative electrode testing assembly includes a negative electrode detection element that can move along the second direction, the negative electrode detection element being used to contact the negative electrode post of the battery cell.

[0037] As an optional implementation, the cell testing equipment further includes a drive assembly;

[0038] The driving component includes:

[0039] The second driving component is used to drive the positive electrode detection element to move along the second direction;

[0040] The third driving component is used to drive the negative electrode detection element to move along the second direction.

[0041] As an optional implementation, the second driving component includes:

[0042] The second driving component is connected to the mounting base;

[0043] The second push rod extends along the second direction, with its first end connected to the second driving member and its second end connected to the positive electrode detection member.

[0044] The second driving member is used to drive the positive electrode detection member to move along the second direction via the second push rod;

[0045] And / or,

[0046] The third driving component includes:

[0047] The third driving component is connected to the mounting base;

[0048] The third push rod extends along the second direction, with its first end connected to the third driving member and its second end connected to the negative electrode detection member;

[0049] The third driving member is used to drive the negative electrode detection member to move along the second direction via the third push rod.

[0050] As an optional implementation, the driving component further includes a fourth driving component;

[0051] The fourth driving component is used to drive the negative electrode test component to move along a third direction to adapt to the battery cells with different electrode spacing.

[0052] The fourth driving component includes:

[0053] The fourth driving component is connected to the mounting base;

[0054] A lead screw extends along the third direction and is connected to the fourth driving component in a transmission manner;

[0055] The negative electrode test component is mounted on the drive screw via a sliding member and is threadedly connected to the drive screw.

[0056] The battery cell pressurizing device and battery cell testing equipment provided in this application include a pressurizing assembly, which includes a bladder. The bladder is disposed on the side of the battery cell to be pressurized. The bladder is configured to expand when filled with fluid to fit against and abut against the surface of the side of the battery cell to be pressurized. By adopting a flexible pressurizing structure, the bladder can adaptively fit the surface contour of the side of the battery cell to be pressurized, achieving uniform pressure distribution. This effectively avoids the problem of uneven pressure caused by the inability of traditional rigid pressure plates to fully fit, resulting in local missed detections, and improves the accuracy and reliability of battery cell testing. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0058] Figure 1 A schematic diagram of the connection structure of the pressurizing component, connecting component and mounting bracket in the battery cell pressurizing device provided in the embodiments of this application;

[0059] Figure 2A schematic diagram of the connection structure of the first limiting component, the first driving component, and the mounting bracket in the cell pressurization device provided in the embodiments of this application;

[0060] Figure 3 This is a schematic diagram of the structure of the battery cell testing equipment provided in the embodiments of this application;

[0061] Figure 4 for Figure 3 A schematic diagram of the connection structure between the mounting base and the fourth drive component of the cell testing equipment;

[0062] Figure 5 for Figure 3 A schematic diagram of the connection structure between the positive electrode testing component and the second drive component of the cell testing equipment;

[0063] Figure 6 for Figure 3 A schematic diagram of the connection structure between the negative electrode test component and the third drive component of the cell testing equipment.

[0064] Explanation of reference numerals in the attached figures:

[0065] 100. Pressurization components;

[0066] 110. Cyst;

[0067] 120. Connecting plate; 1201. Pressurization space; 121. Slider; 122. Guide post;

[0068] 130. Mounting bracket; 1301. Slide groove; 131. Mounting plate; 132. Support frame;

[0069] 410. First limiting component; 411. First connecting member; 4111. Sliding bushing; 412. First limiting member;

[0070] 420. Second limiting assembly; 421. Second limiting member; 4211. Limiting part;

[0071] 510. First drive assembly; 511. First drive component; 512. First push rod;

[0072] 520. Second drive assembly; 521. Second drive component; 5211. First mounting fixture; 522. Second push rod;

[0073] 530. Third drive assembly; 531. Third drive component; 5311. Second mounting fixture; 5312. Sliding block; 532. Third push rod;

[0074] 540. Fourth drive component; 541. Fourth drive element;

[0075] 600. Mounting base; 601. Guide rail;

[0076] 710. Positive electrode test assembly; 711. Positive electrode detection device; 712. First rod; 713. Second connector;

[0077] 720. Negative electrode test assembly; 721. Negative electrode detection component; 722. Second rod; 723. Third connector;

[0078] 900, battery cell.

[0079] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the embodiments of this application.

[0081] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0082] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0083] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0084] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0085] Battery cells are the core component of rechargeable batteries, and their performance directly affects the battery's safety, energy density, and cycle life. With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, the demand for rechargeable batteries has increased dramatically, and the requirements for the quality and safety of battery cells have become increasingly stringent.

[0086] Short-circuit testing is required during both the cell research and development and quality control stages to ensure safety and reliability. Related technologies primarily employ mechanical pressure plates or servo pressure devices to apply pressure to the cell, detecting changes in resistance or voltage to determine the presence of a short circuit.

[0087] However, in some battery cell designs, thinning is performed in certain areas to improve energy density; other cells may have a certain curvature or slight unevenness on their surface. When pressure is applied, rigid mechanical pressure plates cannot follow the microscopic contours of the cell surface. Ultimately, pressure is only applied to a few highest points on the cell surface, forming point or line contacts. This results in a highly uneven pressure distribution. Specifically, pressure is concentrated at contact points, potentially much higher than the set value; while in low-lying, non-contact areas, the pressure is almost zero.

[0088] It is evident that existing battery cell testing equipment cannot fully adhere to the surface of the battery cell when applying pressure, resulting in uneven pressure application. Consequently, internal defects located in areas with low or no pressure cannot be effectively detected, leading to missed detections.

[0089] In view of this, embodiments of this application provide a battery cell pressurization device and a battery cell testing equipment. The battery cell pressurization device includes a pressurization component, which includes a bladder. The bladder is disposed on the side of the battery cell to be pressurized. The bladder is configured to expand when filled with fluid to fit against the surface of the side of the battery cell to be pressurized and to abut against the surface of the side of the battery cell to be pressurized.

[0090] When pressurizing the battery cell, the flexible properties of the capsule can adaptively fit the surface contour of the side of the battery cell to be pressurized, achieving uniform pressure distribution. This effectively avoids the problem of uneven pressure caused by the inability of traditional rigid pressure plates to fully fit, resulting in local missed detections, and improves the accuracy and reliability of battery cell testing.

[0091] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0092] Combination Figure 1 As shown, a first aspect of this application provides a battery cell pressurization device, including a pressurization assembly 100. The pressurization assembly 100 includes a bladder 110, which is disposed on the side of the battery cell 900 to be pressurized. The bladder 110 is configured to expand when filled with fluid to conform to and abut against the surface of the battery cell 900 to be pressurized.

[0093] Utilizing the flexibility of the capsule 110, it can adaptively conform to the surface contour of the cell 900 to be pressurized after inflation, achieving uniform pressure distribution. This effectively solves the problem of uneven pressure caused by the inability of traditional rigid pressure plates to fully conform, resulting in local missed detections, and helps to improve the accuracy and reliability of cell 900 testing.

[0094] The surface to be pressurized is usually the large surface of cell 900. Taking a common soft-pack lithium battery as an example, cell 900 is a flat rectangle. The large surfaces of cell 900 are the two largest surfaces (i.e., the two sides in the thickness direction of cell 900), which are the main areas covered by the aluminum-plastic film packaging.

[0095] The internal structure (wound or stacked) of cell 900 is extended in a direction parallel to the large surface. The pressure applied to the large surface can be effectively transmitted to the entire internal electrode and separator area, simulating the short circuit that may occur in the entire internal active area when the battery is subjected to external pressure.

[0096] For example, the capsule 110 can be made of a highly elastic, high-strength rubber-like material, such as silicone rubber, polyurethane, or neoprene. These materials have good flexibility, fatigue resistance, and a certain tear strength, and can withstand repeated inflation and deflation cycles.

[0097] For example, the capsule 110 can be a closed, flat capsule. Its contact surface facing the cell 900 can be a flat or slightly curved surface to match the large surface shape of a common cell 900. In the non-working state (without fluid), the capsule 110 is in a contracted state to facilitate the insertion and removal of the cell 900.

[0098] For example, compressed air can be used as the fluid, which is readily available, low in cost, and pollution-free. In processing environments with special explosion-proof requirements, inert gases (such as nitrogen) can also be used as the fluid.

[0099] In practice, after the battery cell 900 is positioned, the capsule 110 is in a contracted state, maintaining a certain gap or no pressure contact with the surface of the battery cell 900. When the capsule 110 is filled with fluid medium, it begins to expand, and its soft contact surface first contacts the highest point of the battery cell 900 surface. As the air pressure continues to increase, the flexibility of the capsule 110 allows it to fill the recessed areas on the surface of the battery cell 900, ultimately achieving a tight fit with the entire surface to be pressurized. The pressure inside the capsule 110 can be evenly transmitted to every unit area of ​​the surface of the battery cell 900, eliminating local pressure concentration or pressure gaps. After the battery cell 900 test is completed, the fluid medium inside the capsule 110 is discharged, its volume shrinks, it separates from the battery cell 900, and the battery cell pressurization device resets.

[0100] In some embodiments, the pressurizing assembly 100 has a connecting plate 120, which is disposed on the side of the bladder 110 away from the battery cell 900, and the bladder 110 is fixedly connected to the connecting plate 120.

[0101] Understandably, the capsule 110 itself is flexible and deformable, and can fit the battery cell 900, but it is difficult to maintain its shape independently and transmit the force from the driving source.

[0102] The connecting plate 120, as a rigid mounting base, provides stable and reliable support for the flexible bladder 110. The bladder 110 is fixed to the connecting plate 120, and the reaction force generated when it is inflated can be effectively transmitted to the support structure of the entire device through the connecting plate 120, thereby achieving stable pressurization of the battery cell 900.

[0103] By providing a connecting plate 120 on the side of the bladder 110 away from the battery cell 900, a stable and reliable mounting base can be provided for the soft bladder 110, ensuring that the bladder 110 is fixed in position and the direction of force can be controlled during inflation and deflation, while also facilitating the installation and maintenance of the bladder 110.

[0104] For example, the bladder body 110 and the connecting plate 120 can be detachably connected by means of pressure plate fixing, embedded fixing, pin fixing or clamp fixing.

[0105] In some embodiments, the pressurizing assembly 100 includes a mounting bracket 130. A connecting plate 120 is detachably connected to the mounting bracket 130. Multiple connecting plates 120 are spaced apart along a first direction Y, forming a pressurizing space 1201 between adjacent connecting plates 120. The pressurizing space 1201 is used to accommodate the battery cell 900. Multiple capsules 110 are correspondingly connected to the side of each connecting plate 120 facing the pressurizing space 1201.

[0106] It should be noted that the thickness direction of the battery cell 900 is parallel to the first direction Y. Since pressure needs to be applied to the large surface of the battery cell 900, aligning the thinnest thickness direction of the battery cell 900 with the pressure direction (i.e., the clamping direction of the multiple connecting plates 120 and the bladder 110) ensures that the pressure application assembly 100 can directly and effectively apply force to the two main surfaces with the largest area, thereby efficiently transmitting the test pressure to the core area inside the battery cell 900.

[0107] A single capsule 110 can only apply pressure to one side of the battery cell 900. However, the two connecting plates 120 and the capsule 110, spaced apart along the first direction Y, form a clamp-like structure that can simultaneously apply uniform and symmetrical pressure to both large surfaces of the battery cell 900. This layout more realistically simulates the compression condition of the battery cell 900 within the battery pack.

[0108] The pressurized space 1201 formed between adjacent connecting plates 120 is not only the location to accommodate the battery cell 900, but also the controlled environment in which all pressurization and limiting actions occur, ensuring the repeatability and consistency of the testing process.

[0109] Specifically, through the modular design of multiple connecting plates 120 and multiple bladders 110, flexible pressure can be applied simultaneously from multiple sides of the cell 900. This is especially suitable for pressurizing large-sized cells 900 or cells that require multi-sided testing, ensuring the three-dimensional uniformity of pressure distribution and further improving the test coverage and effect.

[0110] Furthermore, by providing more than two connecting plates 120 along the first direction Y, multiple parallel pressurization spaces 1201 can be formed. This allows the device to simultaneously accommodate and test multiple battery cells 900, significantly improving testing efficiency.

[0111] Specifically, the mounting bracket 130 may include a mounting plate 131, which is used to fix the workbench surface and provide mounting space for the connecting plate 120.

[0112] For example, the mounting plate 131 may be provided with a standardized system of mounting holes or T-slots, so that the connecting plate 120 can be detachably connected to the mounting bracket 130 in a simple manner, so as to enable quick replacement of the bladder 110.

[0113] Combination Figure 2 As shown, in some embodiments, the cell pressurization device further includes a first limiting component 410. The first limiting component 410 is movably disposed on the mounting bracket 130 and is used to move towards or away from the capsule 110 along the second direction Z. When the first limiting component 410 approaches the capsule 110, it abuts against the side of the capsule 110 facing the second direction Z to limit the expansion range of the capsule 110 in the second direction Z. The second direction Z is perpendicular to the first direction Y.

[0114] It should be noted that the width direction of cell 900 is parallel to the second direction Z, and the length direction of cell 900 is parallel to the third direction X. When the positive and negative terminals of cell 900 are both located on the same side of its width direction, this orientation ensures that all terminals can be exposed laterally from the pressurization space 1201 during pressure testing, providing operating space for reliable contact between the test components and the terminals.

[0115] Specifically, the mounting bracket 130 may include a support frame 132, which can be mounted above the pressurizing component 100 to provide installation space for the first limiting component 410, so that the first limiting component 410 can move closer to or away from the bladder 110 along the second direction Z.

[0116] Understandably, the capsule 110 has the natural property of freely expanding in all directions when inflated. The first limiting component 410 can provide an adjustable physical baffle in the second direction Z for the free expansion of the capsule 110.

[0117] By controlling the position of the first limiting component 410 in the second direction Z, the expansion range of the capsule 110 in the width direction of the cell 900 can be precisely limited, ensuring that the capsule 110 expands towards the thickness direction of the cell 900 and effectively contacts the large surface of the cell 900. This avoids pressure dispersion caused by excessive expansion of the capsule 110 in the second direction Z or incomplete pressure coverage caused by insufficient expansion.

[0118] Specifically, the first limiting component 410 controls the expansion dimension of the bladder 110 in the second direction Z, so that the same set of battery cell pressurizing devices can be adapted to battery cells 900 of different widths by adjusting the position of the first limiting component 410, thereby improving compatibility and avoiding the trouble and cost of customizing special fixtures for each width of battery cell 900.

[0119] In some embodiments, the first limiting component 410 includes a first connector 411 and a first limiting member 412. The first connector 411 is movably connected to the mounting bracket 130; the first limiting member 412 is connected to the first connector 411; the first connector 411 is used to drive the first limiting member 412 to move along the second direction Z, and at least a portion of the first limiting member 412 extends into the pressurization space 1201 and abuts against the bladder body 110.

[0120] The first limiting member 412 directly intervenes in the pressurization space 1201 and contacts the side of the bladder 110 in the second direction Z. It can effectively constrain the expansion of the bladder 110 in the second direction Z, ensuring that the pressure is accurately applied to the specified width area of ​​the cell 900. The structure is simple and the control is reliable.

[0121] Specifically, in combination Figure 1 and Figure 2 As shown, there are multiple first limiting members 412, which are connected to the first connecting member 411 and are spaced apart. Each first limiting member 412 corresponds to a pressurized space 1201.

[0122] By connecting multiple first limiting members 412 through the first connector 411, it is ensured that the limiting boundaries of the bladders 110 in all pressurized spaces 1201 are consistent and change synchronously in the width direction, which helps to ensure the consistency of test conditions in multiple pressurized spaces 1201.

[0123] For example, the first connecting member 411 may be a long crossbeam, on which all the first limiting members 412 are fixed. The two ends or the middle of the crossbeam are used to connect with a mechanism (such as a lead screw nut or push rod) that drives the first limiting assembly 410 to move.

[0124] The number of first connectors 411 can also be multiple, which is used to improve the stability of the connection with the first limiting member 412.

[0125] For example, the front end of the first limiting member 412 extending into the pressurization space 1201 can be configured as an arc or a slope. In this way, when the limiting member moves close to the slightly inflated bladder 110, it can play a guiding role, smoothly squeezing the bladder 110 to the predetermined position and avoiding hard collisions and scratches.

[0126] In some embodiments, the cell pressurization device further includes a first drive assembly 510. The first drive assembly 510 includes a first drive member 511 and a first push rod 512.

[0127] The first driving member 511 is connected to the support frame 132 of the mounting bracket 130; the first push rod 512 extends along the second direction Z, the first end of the first push rod 512 is connected to the first driving member 511, and the second end of the first push rod 512 is connected to the first limiting component 410; the first driving member 511 is used to drive the first limiting component 410 to move along the second direction Z through the first push rod 512.

[0128] The first drive component 510 enables the automated movement of the first limit component 410, allowing the device to automatically and quickly adjust the limit position when switching the model of the test cell 900, which greatly improves the model change efficiency and the automation level of the equipment, and reduces manual intervention.

[0129] For example, the first drive element 511 may be a combination of a motor and a ball screw, an electric actuator, a linear motor, or a cylinder, etc.

[0130] Understandably, if the push rod is subjected to a force deviating from its axial direction when transmitting thrust, it may bend or vibrate, causing the first limiting component 410 to deflect. A guide structure can be provided on the extension path of the push rod to provide additional radial support, ensuring that the push rod only moves axially, thereby improving the system rigidity and motion stability.

[0131] For example, a sliding bushing 4111 can be provided on the first connector 411, and a guide post 122 can be provided on the connecting plate 120. When the first driving member 511 drives the first limiting component 410 to move along the second direction Z through the first push rod 512, the guide post 122 slides in the sliding bushing 4111 to prevent the first limiting component 410 from twisting around the second direction Z during the movement.

[0132] In some embodiments, one of the mounting bracket 130 and the connecting plate 120 is provided with a slide groove 1301, and the other is provided with a slider 121; one end of the slide groove 1301 has an opening, and the slider 121 enters the slide groove 1301 through the opening and can slide along the slide groove 1301.

[0133] For example, the extension direction of the groove 1301 may be parallel to the second direction Z.

[0134] The cooperation between slider 121 and groove 1301 forms a simple and reliable quick-installation structure. This structure not only ensures the accurate positioning of connecting plate 120 on mounting bracket 130, but also enables quick assembly and disassembly of connecting plate 120, facilitating individual maintenance or replacement of specific capsule 110 or connecting plate 120, and reducing maintenance complexity.

[0135] For example, the slider 121 and the groove 1301 can be a T-shaped slider 121 and a T-shaped groove, a dovetail slider 121 and a dovetail groove, etc. Of course, the mounting bracket and the connecting plate 120 can also be connected in other detachable ways, and this application embodiment does not impose any restrictions on this.

[0136] Combination Figure 3 and Figure 6 As shown, in some embodiments, the cell pressurization device further includes a second limiting component 420; the second limiting component 420 is movably disposed on the mounting bracket 130, and the second limiting component 420 is used to move closer to or away from the capsule 110 along a third direction X; when the second limiting component 420 approaches the capsule 110, it abuts against the side of the capsule 110 facing the third direction X, so as to limit the expansion range of the capsule 110 in the third direction X; the third direction X is perpendicular to the first direction Y.

[0137] Understandably, based on the existing first limiting component 410 controlling the expansion range of the bladder 110 along the second direction Z, the setting of the second limiting component 420 increases the control of the expansion range of the bladder 110 in the third direction X (usually the length direction of the cell 900).

[0138] By setting the second limiting component 420, the constraint of the capsule 110 in the length direction of the cell 900 is realized, so that the cell pressurization device can simultaneously adapt to cells 900 of different lengths and widths, improving the stepless compatibility of the device from one dimension to two dimensions, and greatly expanding its application range.

[0139] Meanwhile, the bidirectional limiting ensures that the bladder 110 can expand precisely according to the preset rectangular area when inflated, so that the pressure application area is highly matched with the pressure-to-pressurize area of ​​the battery cell 900, further improving the accuracy of the pressurization part.

[0140] For example, the second limiting component 420 includes a plurality of second limiting members 421, which can be connected together and are spaced apart, with each second limiting member 421 corresponding to a pressurized space 1201.

[0141] Specifically, the second limiting component 420 has two limiting portions 4211. When the second limiting component 421 approaches the bladder 110, the two limiting portions 4211 can contact the bladder 110 located on both sides of the thickness direction of the cell 900 respectively, so as to simultaneously limit the expansion range of the bladder 110 located on both sides of the cell 900 in the third direction X.

[0142] The specific operating steps of the cell pressurization device provided in this application embodiment are as follows: First, the first limiting component 410 and the second limiting component 420 are moved according to the cell 900 model to set the expansion boundaries of the capsule 110 in the second direction Z and the third direction X; then, the capsule 110 is inflated and expands, applying uniform and controllable normal pressure to the large surface of the cell 900 under preset spatial constraints; after the test is completed, the capsule 110 is depressurized and contracts, and each limiting component returns to its original position. The entire process realizes flexible and adaptive pressurization of the cell 900.

[0143] Combination Figure 3 and Figure 4 As shown, a second aspect of this application provides a battery cell testing device, including a mounting base 600, a testing component, and a battery cell pressurizing device provided in any of the above embodiments. Both the battery cell pressurizing device and the testing component are mounted on the mounting base 600, and the testing component is used to perform a short-circuit test on a battery cell 900 disposed in the battery cell pressurizing device.

[0144] The cell pressurization device has been described in detail in the above embodiments and will not be repeated here.

[0145] Integrating the flexible pressurization device of the above embodiment with the test components constitutes a complete test system. This allows the cell testing equipment to combine the advantages of flexible and uniform pressure application and precise electrical performance testing, enabling safer and more reliable short-circuit detection of the 900 cell.

[0146] Specifically, the mounting base 600 may be provided with a pressurization processing area, the battery cell pressurization device is located in the pressurization processing area, and the mounting bracket 130 of the battery cell pressurization device is fixedly connected to the mounting base 600.

[0147] In practice, a robotic arm or operator places the battery cell 900 into the pressurization space 1201 of the pressurization device. Depending on the model of the battery cell 900, the first limiting component 410 and the second limiting component 420 move, controlling the expansion range of the capsule 110. The capsule 110 inflates, applying a preset pressure to the large surface of the battery cell 900. During the pressure holding phase, the probe of the testing component moves and contacts the terminal of the battery cell 900 to perform tests such as insulation resistance and withstand voltage. After the tests are completed, the capsule 110 deflates, the limiting components retract, and the robotic arm or operator removes the tested battery cell 900.

[0148] Combination Figure 5 and Figure 6As shown, in some embodiments, the test assembly includes a positive electrode test assembly 710 and a negative electrode test assembly 720; the positive electrode test assembly 710 includes a positive electrode detection element 711 movable along the second direction Z, the positive electrode detection element 711 being used to contact the positive terminal of the battery cell 900; the negative electrode test assembly 720 includes a negative electrode detection element 721 movable along the second direction Z, the negative electrode detection element 721 being used to contact the negative terminal of the battery cell 900.

[0149] Since the positions of the terminals of different cell models 900 may be different in the second direction Z, by setting the positive terminal detection component 711 and the negative terminal detection component 721 to move along the second direction Z respectively, the same set of test components can dynamically find and align the terminal positions of different cells 900, thereby improving the compatibility of the test equipment.

[0150] Specifically, in the positive electrode testing assembly 710, there can be multiple positive electrode detection elements 711, which can be used to detect the corresponding battery cell 900 within each pressurized space 1201. Similarly, in the negative electrode testing assembly 720, there can be multiple negative electrode detection elements 721, which can be used to detect the corresponding battery cell 900 within each pressurized space 1201. This arrangement facilitates the simultaneous testing of multiple battery cells 900, improving testing efficiency.

[0151] The second limiting component 420 can be integrated into the positive electrode test component 710 or the negative electrode test component 720.

[0152] In some embodiments, the cell testing equipment further includes a drive assembly. The drive assembly includes a second drive assembly 520 and a third drive assembly 530.

[0153] The second drive assembly 520 is used to drive the positive electrode detection element 711 to move along the second direction Z; the third drive assembly 530 is used to drive the negative electrode detection element 721 to move along the second direction Z.

[0154] The second drive assembly 520 and the third drive assembly 530 provide independent drive sources for the movement of the positive electrode detector 711 and the negative electrode detector 721, improving the automation of the detection process. Independent drive allows the positive electrode detector 711 and the negative electrode detector 721 to execute different motion strategies. For example, they can make contact sequentially or simultaneously; they can retract simultaneously after the test or retract sequentially according to process requirements, etc.

[0155] Combination Figure 5As shown, exemplarily, the second drive assembly 520 includes a second drive member 521 and a second push rod 522. The second drive member 521 is connected to the mounting base 600; the second push rod 522 extends along the second direction Z, with a first end of the second push rod 522 connected to the second drive member 521 and a second end of the second push rod 522 connected to the positive electrode detection member 711; the second drive member 521 is used to drive the positive electrode detection member 711 to move along the second direction Z via the second push rod 522.

[0156] Specifically, the second driving member 521 can be connected to the mounting base 600 via the first mounting fixture 5211. Multiple positive electrode detection members 711 are respectively connected to the second connecting member 713 via first rods 712, with the multiple first rods 712 arranged in parallel and their extension directions parallel to the second direction Z. The second end of the second push rod 522 is connected to the positive electrode detection member 711 via the second connecting member 713. The multiple first rods 712 are also respectively inserted into the first mounting fixture 5211, and when the positive electrode detection member 711 moves along the second direction Z, the first rods 712 are slidably connected to the first mounting fixture 5211.

[0157] It should be noted that the specific structure of the first mounting fixture 5211 can be flexibly set according to the actual installation environment, and this application embodiment does not impose any restrictions on it.

[0158] For example, the second drive element 521 may be a combination of a motor and a ball screw, an electric actuator, a linear motor, or a cylinder, etc.

[0159] In a specific implementation, the output shaft of the second driving member 521 can drive the second push rod 522 to move, thereby causing the second connecting member 713 to move along the second direction Z, thereby causing multiple positive electrode detection members 711 to move along the second direction Z to contact the positive electrode post of the battery cell 900.

[0160] Combination Figure 6 As shown, exemplarily, the third drive assembly 530 includes a third drive member 531 and a third push rod 532. The third drive member 531 is connected to the mounting base 600; the third push rod 532 extends along the second direction Z, with a first end of the third push rod 532 connected to the third drive member 531 and a second end of the third push rod 532 connected to the negative electrode detection member 721; the third drive member 531 is used to drive the negative electrode detection member 721 to move along the second direction Z via the third push rod 532.

[0161] Specifically, the third driving member 531 can be connected to the mounting base 600 via the second mounting fixture 5311. Multiple negative electrode detection members 721 are respectively connected to the third connecting member 723 via second rods 722, with the multiple second rods 722 arranged in parallel and their extension directions parallel to the second direction Z. The second end of the third push rod 532 is connected to the negative electrode detection member 721 via the third connecting member 723. The multiple second rods 722 are also respectively inserted into the second mounting fixture 5311, and when the negative electrode detection member 721 moves along the second direction Z, the second rods 722 are slidably connected to the second mounting fixture 5311.

[0162] It should be noted that the specific structure of the second mounting fixture 5311 can be flexibly set according to the actual installation environment, and this application embodiment does not impose any restrictions on it.

[0163] For example, the third drive unit 531 may be a combination of a motor and a ball screw, an electric actuator, a linear motor, or a cylinder, etc.

[0164] In a specific implementation, the output shaft of the third driving member 531 can drive the third push rod 532 to move, thereby causing the third connecting member 723 to move along the second direction Z, which in turn causes multiple negative electrode detection members 721 to move along the second direction Z to contact the negative electrode post of the battery cell 900.

[0165] The relative positions of the positive and negative terminals in the third direction (X) may differ for different models of 900 cells. Figure 3 and 4 As shown, in some embodiments, the driving assembly further includes a fourth driving assembly 540. The fourth driving assembly 540 is used to drive the negative electrode test assembly 720 to move along a third direction X to accommodate cells 900 with different terminal spacing. This configuration expands the range of cells 900 that the device can be compatible with from those differing only in width to those that may differ in both width and terminal spacing, greatly enhancing the versatility of the device.

[0166] For example, the fourth drive assembly 540 includes a fourth drive member 541 and a drive screw (not shown in the figure). The fourth drive member 541 is connected to the mounting base 600; the drive screw extends in a third direction X and is drively connected to the fourth drive member 541; the negative electrode test assembly 720 is sleeved on the drive screw via a slider (not shown in the figure) and is threadedly connected to the drive screw.

[0167] The entire negative electrode test assembly 720 is moved by the lead screw and nut pair, which can accurately and continuously adjust the distance between the positive and negative electrode test components, thus easily adapting to various 900 cell models with different pole spacings. This enables rapid, hardware-free model changeover and broadens the application range of the equipment.

[0168] Specifically, in order to ensure that the negative electrode test component 720 can move along the preset trajectory, a guide rail 601 extending in the third direction X can also be provided on the mounting base 600. Correspondingly, a sliding block 5312 is provided on the side of the second mounting fixture 5311 facing the mounting base 600, and the sliding block 5312 is slidably connected to the guide rail 601.

[0169] It should be noted that the slider can be a structure connected to the negative electrode test component 720 or a structure connected to the third drive component 530. For example, the slider is connected to the third connector 723, or the slider is connected to the second mounting fixture 5311. When the drive screw drives the slider to move, the slider can drive the negative electrode test component 720 or the third drive component 530 to move, thereby causing the negative electrode test component 720 and the third drive component 530 as a whole to move.

[0170] It should also be noted that the fourth drive component 540 can also be used to drive the positive electrode test component 710 to move along the third direction X to adjust the distance between the positive and negative electrode detection components, thereby easily adapting to various cell 900 models with different electrode spacing.

[0171] In some embodiments, combined with Figure 6 As shown, the second limiting component 420 can be integrated into the positive electrode test component 710 or the negative electrode test component 720.

[0172] Specifically, the second limiting member 421 in the second limiting component 420 is correspondingly set with the negative electrode detection member 721 and is fixedly connected to the second mounting fixture 5311.

[0173] This configuration eliminates the need for a separate drive system for driving the second limiting component 420, simplifying the overall structure of the device. Under the action of the drive rod of the fourth drive component 540, the negative second limiting component 420 can move together with the pole test component 720 along the third direction X to abut against the end face of the capsule 110 along the third direction X, thereby better controlling the expansion range of the capsule 110 in the third direction X.

[0174] The specific operating steps of the battery cell testing equipment provided in this application embodiment are as follows: First, adjust the positions of the first limiting component 410, the second limiting component 420 and the testing component according to the battery cell 900 model; then, inflate the capsule 110 to apply pressure to the battery cell 900; then, the positive electrode detection component 711 and the negative electrode detection component 721 contact the electrode post to perform electrical tests such as insulation withstand voltage; after the test is completed, depressurize the capsule 110 and retract the testing component.

[0175] Specifically, the embodiments of this application employ a flexible pressure-applying structure with a capsule 110, which can adaptively conform to the surface of the battery cell 900, achieving uniform pressure distribution and effectively avoiding the local pressure unevenness and missed detection problems caused by traditional rigid pressure plates. At the same time, combined with the adjustable first limiting component 410, the second limiting component 420, and the testing component, stepless compatibility with battery cells 900 of different sizes is achieved, significantly improving the versatility of the equipment and testing efficiency. The modular design simplifies the changeover and maintenance process, reduces equipment operation and maintenance costs, and is suitable for large-scale, multi-specification battery cell 900 production testing scenarios.

[0176] Finally, it should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of the present application. The embodiments of this application are intended to cover any variations, uses, or adaptations of the embodiments of this application that follow the general principles of the embodiments of this application and include common knowledge or customary technical means in the art not disclosed in the embodiments of this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the embodiments of this application are indicated by the following claims.

[0177] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

Claims

1. A battery cell pressurization device, characterized in that, include: The pressurization assembly (100) includes a capsule (110) for placement on the pressurized side of a battery cell (900), the capsule (110) being configured to expand upon filling with fluid to conform to and abut against the surface of the pressurized side of the battery cell (900).

2. The cell pressurization device according to claim 1, characterized in that, The pressurization assembly (100) includes a connecting plate (120) which is disposed on the side of the capsule (110) away from the battery cell (900) and the capsule (110) is fixedly connected to the connecting plate (120).

3. The cell pressurization device according to claim 2, characterized in that, The pressurization assembly (100) includes a mounting bracket (130); The connecting plate (120) is detachably connected to the mounting bracket (130); The number of the connecting plates (120) is multiple, and the multiple connecting plates (120) are spaced apart along the first direction. A pressurized space (1201) is formed between two adjacent connecting plates (120), and the pressurized space (1201) is used to accommodate the battery cell (900). There are multiple capsules (110), and each capsule (110) is connected to the side of each connecting plate (120) facing the pressurized space (1201).

4. The cell pressurization device according to claim 3, characterized in that, It also includes a first limiting component (410); The first limiting component (410) is movably disposed on the mounting bracket (130), and the first limiting component (410) is used to move closer to or further away from the bladder (110) in a second direction; When the first limiting component (410) approaches the capsule (110), it abuts against the side of the capsule (110) facing the second direction to limit the expansion range of the capsule (110) in the second direction; The second direction is perpendicular to the first direction.

5. The cell pressurization device according to claim 4, characterized in that, The first limiting component (410) includes: The first connector (411) is movably connected to the mounting bracket (130); The first limiting member (412) is connected to the first connecting member (411). The first connector (411) is used to drive the first limiting member (412) to move along the second direction, and at least a portion of the first limiting member (412) extends into the pressurized space (1201) and abuts against the bladder (110).

6. The cell pressurization device according to claim 4, characterized in that, It also includes a first drive component (510); The first driving component (510) includes: The first driving component (511) is connected to the mounting bracket (130); A first push rod (512) extends along the second direction, with a first end of the first push rod (512) connected to the first drive member (511) and a second end of the first push rod (512) connected to the first limiting component (410). The first drive member (511) is used to drive the first limiting component (410) to move along the second direction via the first push rod (512).

7. The cell pressurization device according to any one of claims 3-6, characterized in that, One of the mounting bracket (130) and the connecting plate (120) is provided with a sliding groove (1301), and the other is provided with a slider (121). One end of the slide (1301) has an opening, and the slider (121) enters the slide (1301) through the opening and can slide along the slide (1301).

8. The cell pressurization device according to any one of claims 3-6, characterized in that, It also includes a second limiting component (420); The second limiting component (420) is movably disposed on the mounting bracket (130) and is used to move toward or away from the capsule (110) in a third direction; When the second limiting component (420) approaches the capsule (110), it abuts against the side of the capsule (110) facing the third direction to limit the expansion range of the capsule (110) in the third direction; The third direction is perpendicular to the first direction.

9. A battery cell testing device, characterized in that, Includes a mounting base (600), a test assembly, and a cell pressurization device as described in any one of claims 1-8; Both the cell pressurization device and the test component are mounted on the mounting base (600), and the test component is used to perform short-circuit tests on the cell (900) mounted in the cell pressurization device.

10. The cell testing equipment according to claim 9, characterized in that, The test components include a positive electrode test component (710) and a negative electrode test component (720). The positive electrode test assembly (710) includes a positive electrode detection element (711) movable in a second direction, the positive electrode detection element (711) being used to contact the positive electrode post of the battery cell (900); The negative electrode test assembly (720) includes a negative electrode detection element (721) movable in the second direction, the negative electrode detection element (721) being used to contact the negative electrode post of the cell (900).

11. The cell testing equipment according to claim 10, characterized in that, It also includes driver components; The driving component includes: The second driving component (520) is used to drive the positive electrode detection element (711) to move along the second direction; The third drive assembly (530) is used to drive the negative electrode detection element (721) to move along the second direction.

12. The cell testing equipment according to claim 11, characterized in that, The second drive component (520) includes: The second drive unit (521) is connected to the mounting base (600); The second push rod (522) extends along the second direction, the first end of the second push rod (522) is connected to the second drive member (521), and the second end of the second push rod (522) is connected to the positive electrode detection member (711); The second driving member (521) is used to drive the positive electrode detection member (711) to move along the second direction via the second push rod (522); And / or, The third drive component (530) includes: The third drive unit (531) is connected to the mounting base (600); The third push rod (532) extends along the second direction. The first end of the third push rod (532) is connected to the third drive member (531), and the second end of the third push rod (532) is connected to the negative electrode detection member (721). The third driving member (531) is used to drive the negative electrode detection member (721) to move along the second direction via the third push rod (532).

13. The cell testing equipment according to claim 11 or 12, characterized in that, The drive component also includes a fourth drive component (540). The fourth driving component (540) is used to drive the negative electrode test component (720) to move along a third direction to adapt to the battery cell (900) with different electrode spacing. The fourth drive component (540) includes: The fourth drive unit (541) is connected to the mounting base (600); A drive screw extends along the third direction and is connected in transmission to the fourth drive member (541); The negative electrode test component (720) is mounted on the drive screw via a sliding member and is threadedly connected to the drive screw.

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