A precisely adjustable square lithium battery test fixture

Abstract

The utility model discloses a square lithium cell test fixture of accurate regulation, including upper fixed clamping plate, lower fixed clamping plate, the four corner positions of upper fixed clamping plate and lower fixed clamping plate are all set up as the insertion slot no.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing technology, specifically to a precisely adjustable square lithium battery testing fixture. Background Technology

[0002] With the rapid development of new energy vehicles and smart grids, battery cells, as the core carriers of energy storage and release, have their performance parameters (such as capacity, internal resistance, and cycle life) directly affecting the safety and reliability of battery systems. As the demand for high-energy-density, long-term stable-operation batteries in new energy machinery and passenger vehicles increases, energy storage devices such as lithium batteries have become a core component of modern society. Lithium batteries, with their high energy density, long lifespan, and light weight, have been widely used in many fields. However, as the scale of battery applications expands, battery safety, stability, and durability are gradually becoming the focus of technological innovation.

[0003] As the core component, the accuracy and efficiency of battery cell performance testing directly impact product quality and R&D progress. Currently, battery cell testing commonly employs mechanical clamps to hold the cells and establish test circuits, but traditional clamps have significant technical drawbacks: For example, the prior art CN202123075685.0 discloses a test fixture suitable for square lithium batteries of various sizes. The fixture lacks a visual size marking system, and repeated trial fittings and adjustments are required when dealing with diverse cell specifications. A single changeover takes more than 10 minutes.

[0004] For example, the prior art CN202121438858.8 discloses a lithium battery test fixture; taking the lithium battery cycle test as an example, during the battery cycle test, the gas continuously generated inside the battery and the continuously expanding electrode sheets may cause the battery shell to deform to varying degrees; the structure of the prior art is relatively complex, and the test effect is not ideal. It is necessary to improve the structure of the test fixture to meet the millimeter-level accuracy and achieve test consistency.

[0005] Therefore, developing a test fixture that combines size adjustment, precise positioning, and reliable clamping has become a key technical requirement for improving the standardization of battery cell testing and reducing production line debugging costs. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a precisely adjustable square lithium battery test fixture, aiming to improve and solve the aforementioned technical problems.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a precisely adjustable square lithium battery test fixture, including an upper fixed clamping plate and a lower fixed clamping plate. Slots are formed at the four corners of the upper and lower fixed clamping plates. At least one screw hole is formed on one side of each slot. A plug block is inserted into the slot. Each plug block has a screw hole coaxially arranged with the screw hole. The screw hole and screw hole are installed by countersunk bolts. Screw cylinders are provided on the opposing surfaces of two plug blocks located on the same side and distributed vertically. A screw rod with a double-threaded structure is connected between the screw cylinders. A nut is provided in the middle of the screw rod. Millimeter-level measuring components are provided at the four corners of the upper and lower fixed clamping plates. Electrode components are placed between the upper and lower fixed clamping plates. By tightening the nut, the upper and lower fixed clamping plates are moved closer to each other. The expansion gap limit between the upper fixed clamping plate and the electrode components is observed and reserved.

[0008] Preferably, it also includes a millimeter-level scale, with insertion bases provided at the four corners of the lower fixed clamping plate and through-hole brackets provided at the four corners of the upper fixed clamping plate, the millimeter-level scale passing through the through-hole brackets and inserted into the insertion base.

[0009] Preferably, the middle part of the upper fixing clamp is set as a temperature integration component, which is connected to the temperature sensor built into the electrode assembly so that the temperature can be observed on the display terminal on the temperature integration component.

[0010] In summary, this invention provides a precisely adjustable square lithium battery test fixture. By integrating a millimeter-level precision scale and an adjustable fixture design, it significantly improves test positioning accuracy (error ≤ 0.5mm), effectively avoiding the test data drift problem caused by mechanical backlash in traditional fixtures. Secondly, the adjustable structure can be optimized to adapt to square battery cells of different sizes within the 20-200mm range, improving compatibility by over 300%. A single device can meet the testing needs of multiple product specifications, reducing redundant investment in production line equipment. These technologies provide highly reliable and economical testing equipment support for the large-scale intelligent manufacturing of new energy products such as power batteries and energy storage batteries. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the lithium battery testing fixture structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of slot one and plug one of this utility model; In the figure: Upper fixed clamp 1, Lower fixed clamp 2, Slot 1 3, Screw hole 1 4, Insert block 1 5, Screw hole 2 6, Screw barrel 1 7, Screw 11, Nut 12, Electrode assembly 13, Millimeter scale 14, Insert base 15, Through port bracket 16, Temperature integration assembly 17. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] like Figures 1 to 2 As shown: This utility model is a precisely adjustable square lithium battery test fixture. It addresses the technical problems of lacking a visual size marking system for fixtures, requiring repeated trial fittings and adjustments for diverse cell specifications, and the overly complex clamping structure of electrode components in existing test fixtures, which reduces clamping efficiency. The technical solution adopted in this utility model patent includes an upper fixed clamping plate 1 and a lower fixed clamping plate 2. Slots 3 are formed at the four corners of the upper and lower fixed clamping plates 1 and 2. At least one screw hole 4 is formed on one side of each slot 3. An insert block 5 is inserted into the slot 3, and the insert block 5 has the same shape as the screw hole 4. The shaft is provided with screw hole 2 6. Screw hole 1 4 and screw hole 2 6 are installed by countersunk bolts. Two insert blocks 1 5 located on the same side and distributed vertically are provided with screw cylinders 7 on their opposite surfaces. A screw rod 11 with a double thread structure is connected between screw cylinders 1 7. A nut 12 is provided in the middle of screw rod 11. Millimeter-level measuring components are provided at the four corners of upper fixed clamping plate 1 and lower fixed clamping plate 2. Electrode assembly 13 is placed between upper fixed clamping plate 1 and lower fixed clamping plate 2. By turning nut 12, upper fixed clamping plate 1 and lower fixed clamping plate 2 are moved closer to each other. The expansion gap limit between upper fixed clamping plate 1 and electrode assembly 13 is reserved by observing the millimeter-level measuring components.

[0014] The specific operating principle is as follows: To enable the use of diverse cell specifications in the battery testing fixture, a screw 11 with a double-threaded structure is installed at each of the four corners of the upper fixed clamping plate 1 and the lower fixed clamping plate 2. Screw cylinders 7 are threaded to both the upper and lower sides of the screw 11. An insert block 5 is integrally connected to the end of the screw cylinder 7 furthest from the screw 11. The insert block 5 is installed inside the slot 3 and is fixedly connected to the upper fixed clamping plate 1 and the lower fixed clamping plate 2 by two bolts. A nut 12 is installed in the middle of the screw 11. By turning the nut 12, the upper fixed clamping plate 1 and the lower fixed clamping plate 2 are adjusted. The spacing between the upper and lower fixing plates 1 and 2 is adjusted to accommodate lithium battery electrode assembly clamping tests at different heights. Adjusted by nut 12, and with the nearby millimeter-level measuring component, the spacing between the upper and lower fixing plates 1 and 2 is observed and adjusted to allow for millimeter-level expansion gap between the electrode assembly 13 and the fixing plate 1. This allows for stress release during gas expansion of the electrode assembly 13. The upper and lower fixing plates 1 and 2 then clamp and fix the electrode assembly 13, preventing excessive deformation and damage to the lithium battery during testing, thus ensuring battery safety. Through the structure of this utility model patent—where nut 12 drives screw 11 to rotate, adjusting the spacing between the upper and lower fixing plates 1 and 2—it adapts to various cell specifications. By observing the millimeter-level expansion gap value measured by the millimeter-level measuring component, this test fixture can quickly clamp and install the electrode assembly 13 with millimeter-level precision, improving test stability.

[0015] In at least one embodiment, a millimeter-level scale 14 is also included. Insertion bases 15 are provided at the four corners of the lower fixed clamping plate 2, and through-hole brackets 16 are provided at the four corners of the upper fixed clamping plate 1. The millimeter-level scale 14 passes through the through-hole brackets 16 and is inserted into the insertion bases 15.

[0016] By setting a millimeter-level scale 14, the fixture integrates a millimeter-level precision scale, enabling precise adjustment of the distance between the upper fixed clamping plate 1 and the lower fixed clamping plate 2, adapting to multiple specifications of battery cells, and solving the long-standing problem of balancing accuracy, efficiency and reliability in the field of battery cell testing; at the same time, the millimeter-level precision scale precisely reserves the expansion dimensions of the electrode assembly 13, allowing the expansion stress of the electrode assembly 13 to be released, ensuring the safe testing of the electrode assembly 13 and solving the problem of damage caused by deformation.

[0017] In at least one embodiment, the middle part of the upper fixing clamp 1 is set as a temperature integration component 17, preferably a WSK-HS(TH) intelligent integrated controller. The temperature integration component 17 is connected to the built-in temperature sensor of the electrode assembly 13 so that the temperature can be observed on the display terminal on the temperature integration component 17, so as to realize the release temperature monitoring of the electrode assembly 13 during the detection process and prevent excessive heat from damaging the lithium battery.

[0018] The embodiments described in this utility model are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the protection scope of this utility model.

Claims

1. A precisely adjustable square lithium battery test fixture, characterized by, It includes an upper fixed clamping plate (1) and a lower fixed clamping plate (2). The four corners of the upper fixed clamping plate (1) and the lower fixed clamping plate (2) are all provided with slots 1 (3). At least one screw hole 1 (4) is provided on one side of the slot 1 (3). Insert block 1 (5) is inserted into the slot 1 (3). Insert block 1 (5) is provided with screw hole 2 (6) which is coaxial with screw hole 1 (4). Screw hole 1 (4) and screw hole 2 (6) are installed by countersunk bolts. The two insert blocks 1 (5) located on the same side and distributed vertically are provided with screw cylinder 1 (7) on their opposite surfaces. A screw (11) with a double thread structure is connected between the screw barrel (7). A nut (12) is provided in the middle of the screw (11). Millimeter-level measuring components are provided at the four corners of the upper fixed clamping plate (1) and the lower fixed clamping plate (2). An electrode assembly (13) is placed between the upper fixed clamping plate (1) and the lower fixed clamping plate (2). By turning the nut (12), the upper fixed clamping plate (1) and the lower fixed clamping plate (2) move closer to each other. The expansion gap limit between the millimeter-level measuring components and the upper fixed clamping plate (1) and the electrode assembly (13) is reserved.

2. The precisely adjustable square lithium battery test fixture of claim 1, wherein, It also includes a millimeter scale (14), and a plug-in base (15) is provided at the four corners of the lower fixed clamp (2), and a through slot (16) is provided at the four corners of the upper fixed clamp (1). The millimeter scale (14) passes through the through slot (16) and is plugged into the plug-in base (15).

3. The precisely adjustable square lithium battery test fixture of claim 1, wherein, The middle part of the upper fixed clamp (1) is set as a temperature integration component (17), which is connected to the built-in temperature sensor of the electrode assembly (13) so that the temperature can be observed on the display terminal on the temperature integration component (17).

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