DCIR test tool and DCIR test production line
By designing a DCIR testing fixture and utilizing components such as a displacement mechanism and a guide slide, the problem of connection line damage caused by probe module movement was solved, thus achieving stability and extended service life of the test connection line.
Patent Information
- Application Number
- CN202423070712.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-12
AI Technical Summary
During the DCIR testing of lithium battery cells, the movement of the probe module causes the connecting wires to be stretched or folded frequently, affecting their service life.
A DCIR testing fixture was designed, including a base, a top cover, a stage, a displacement mechanism, and a detection module. The displacement mechanism moves the probe in the Z direction to press or release the electrode tabs, preventing the detection connection line from moving with the probe. Guide slides and elastic elements are used to ensure the stability of the probe.
This effectively avoids frequent stretching or folding of the testing connection cable, extends the service life of the connection cable, and ensures the stability and reliability of the testing.
Smart Images
Figure CN223624392U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery testing technology, and in particular to a DCIR testing fixture and a DCIR testing production line. Background Technology
[0002] DCIR (Direct Current Internal Resistance) is an important parameter for measuring the performance of lithium-ion battery cells. An increase in cell internal resistance is a significant indicator of cell performance degradation. DCIR testing can effectively assess the health and performance of a cell.
[0003] In the current process of detecting the DC internal resistance of battery cells, the probe module needs to be moved multiple times to align with the battery cell at different positions in order to achieve the detection of the battery cell. However, the above-mentioned way of moving the probe module will cause the connecting wires connected to the probe module to move with the probe module. The connecting wires may be stretched or bent. Long-term use will reduce the service life of the connecting wires and affect the normal use of the probe module.
[0004] Therefore, there is an urgent need for a DCIR testing fixture and DCIR testing production line to solve the above problems. Utility Model Content
[0005] According to one aspect of the present invention, the objective is to provide a DCIR testing fixture that can avoid damage caused by frequent stretching or folding of the test connection wire, thus affecting its service life.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] DCIR test fixtures include:
[0008] A base and a top cover, wherein the top cover is spaced apart from the base in the Z direction, forming a testing station between the top cover and the base;
[0009] A platform, which can be positioned at the testing station and is configured to support the battery cell to be tested;
[0010] A displacement mechanism is movably disposed between the platform and the top cover in the Z direction;
[0011] The detection module is connected to the displacement mechanism, and the detection connection line of the detection module is connected to the top cover. The probe of the detection module can move with the displacement mechanism and can move in the Z direction to press against the tab of the battery cell to be tested at the detection station, or release the pressure on the tab.
[0012] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the displacement mechanism includes a displacement base and a displacement plate. The displacement base is adjustablely spaced from the top cover in the Z direction. The displacement plate is connected to the displacement base, and the probe is disposed on the displacement plate.
[0013] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the displacement mechanism further includes a connecting member, and the displacement plate is connected to the displacement base at intervals through the connecting member;
[0014] The detection module also includes a sleeve and a telescopic rod. The sleeve is connected to the top cover and passes through the displacement plate. The telescopic rod is connected to the probe and is telescopically connected to the sleeve. When the probe presses against the tab of the battery cell to be tested, the telescopic rod can partially retract into the sleeve.
[0015] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the testing module further includes a guide rod and an elastic element. The guide rod is arranged along the Z direction, one end of the guide rod is slidably disposed on the displacement plate, and the other end is connected to the probe. The elastic element is sandwiched between the probe and the displacement plate. When the probe presses against the tab of the cell to be tested, the elastic element is compressed.
[0016] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the DCIR testing fixture further includes a driving device. The driving end of the driving device is disposed on the base, and the output end of the driving device is connected to the displacement mechanism for driving the displacement mechanism to move between the stage and the top cover.
[0017] A guide slide rod is connected between the base and the top cover along the Z direction, and the displacement mechanism is slidably connected to the guide slide rod.
[0018] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the DCIR testing fixture further includes a guide rail, which is disposed on the base along the X direction. A portion of the guide rail extends into the testing station, and the stage slides with the guide rail, enabling it to move along the guide rail into the testing station.
[0019] The X direction is perpendicular to the Z direction.
[0020] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the platform is provided with a plurality of first limiting members, which are spaced apart in the X direction, and an accommodating space is formed between adjacent first limiting members. The accommodating space is configured to accommodate the battery cell to be tested.
[0021] As a preferred embodiment of the DCIR testing fixture provided by this utility model, the spacing between adjacent first limiting members in the X direction is adjustable.
[0022] As a preferred embodiment of the DCIR testing fixture provided by this utility model, an insulating component is provided on the stage, the insulating component is used to support the tab of the battery cell to be tested, and the probe is used to press the tab of the battery cell to be tested against the insulating component.
[0023] According to another aspect of the present invention, the objective is to provide a DCIR testing production line, the DCIR testing production line including the DCIR testing fixture as described in any of the above embodiments, wherein the base is fixedly disposed on the machine base of the DCIR testing production line.
[0024] The beneficial effects of this utility model are:
[0025] The DCIR testing fixture provided by this utility model includes a base, a top cover, a stage, a displacement mechanism, and a detection module. The top cover is spaced apart from the base in the Z-direction, forming a detection station between them. The stage is positioned at the detection station and configured to support the battery cell under test. This configuration provides a stable placement position for the battery cell. The displacement mechanism is movably disposed between the stage and the top cover in the Z-direction. The detection module is connected to the displacement mechanism, and its probe moves with the mechanism, moving in the Z-direction to press against or release the tab of the battery cell under test at the detection station. This configuration allows the displacement mechanism to change the position of the probe, enabling contact between the probe and the tab of the battery cell under test, thus achieving detection. The detection connection cable of the detection module is connected to the top cover. In other words, the detection connection cable of the detection module will not move with the probe. It can always maintain a normal state when the probe moves in the Z direction, avoiding damage caused by frequent stretching or folding of the detection connection cable and affecting its service life. Attached Figure Description
[0026] 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.
[0027] Figure 1 This is a partial structural schematic diagram of the DCIR testing production line provided in this embodiment of the utility model;
[0028] Figure 2This is a schematic diagram of the structure of the DCIR testing fixture provided in this embodiment of the utility model;
[0029] Figure 3 This is a partial structural front view of the DCIR testing fixture provided in this embodiment of the utility model (driving device not shown);
[0030] Figure 4 This is a side view of the DCIR testing fixture provided in this embodiment of the utility model.
[0031] In the picture:
[0032] 10. Machine tools;
[0033] 100. Base;
[0034] 200. Top cover;
[0035] 300, platform; 310, first limiting member; 320, accommodating space; 330, insulating member; 340, second limiting member;
[0036] 400. Displacement mechanism; 410. Displacement base; 420. Displacement plate; 430. Connecting component;
[0037] 500. Detection module; 510. Probe; 520. Sleeve; 530. Telescopic rod; 540. Guide rod; 550. Elastic element;
[0038] 600. Drive unit;
[0039] 700. Guide slide bar;
[0040] 800, guide rail. Detailed Implementation
[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0045] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, 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. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0047] 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.
[0048] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.
[0049] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0050] Figure 1 This diagram illustrates a partial structural schematic of the DCIR testing production line provided in an embodiment of the present invention. (Refer to...) Figure 1 This embodiment provides a DCIR testing fixture and a DCIR testing production line. The DCIR testing production line includes a feeding fixture (not shown), a marking fixture (not shown), and the DCIR testing fixture provided in this embodiment. The DCIR testing fixture is mounted on the machine base 10 of the DCIR testing production line. The feeding fixture is located upstream of the DCIR testing fixture and can sequentially feed multiple cells to be tested. The marking fixture is located downstream of the DCIR testing fixture and can mark cells that have passed or failed the test. Both the feeding fixture and the marking fixture are existing technologies, and their structure and principles will not be described in detail here.
[0051] Figure 2 This diagram shows the structure of the DCIR testing fixture provided in an embodiment of the present invention. Figure 3 This diagram shows a partial front view of the DCIR testing fixture provided in an embodiment of the present invention (driving device 600 is not shown). Figure 4 This figure shows a side view of the DCIR testing fixture provided in an embodiment of the present invention. It should be noted that in the figure, the X, Y, and Z directions are mutually perpendicular. (Refer to...) Figures 1-4 The DCIR testing fixture provided in this embodiment includes a base 100, a top cover 200, a stage 300, a displacement mechanism 400, and a detection module 500.
[0052] Specifically, the base 100 is fixedly mounted on the machine tool 10, and the top cover 200 is spaced apart from the base 100 in the Z direction, forming a testing station between them. The platform 300 is positioned at the testing station and configured to support the battery cell to be tested. The displacement mechanism 400 is movably disposed between the platform 300 and the top cover 200 in the Z direction, making the distance between the displacement mechanism 400 and the platform 300 adjustable in the Z direction. The testing module 500 is connected to the displacement mechanism 400, and the testing connection line of the testing module 500 is connected to the top cover 200. The probe 510 of the testing module 500 can move with the displacement mechanism 400 and can move in the Z direction to press against the tab of the battery cell to be tested at the testing station, or release the pressure on the tab. With the above configuration, the displacement mechanism 400 can change the position of the probe 510 of the detection module 500 to achieve contact between the probe 510 and the tab of the battery cell under test, thereby realizing the detection. The detection connection line of the detection module is connected to the top cover 200. That is to say, the detection connection line of the detection module 500 will not move with the probe 510, and can always maintain a normal state when the probe 510 moves in the Z direction, avoiding damage caused by frequent stretching or folding of the detection connection line and affecting its service life.
[0053] More specifically, there are multiple testing modules 500, arranged in pairs. Two testing modules 500 in the same pair are spaced apart in the Y-direction, allowing them to simultaneously press against the two tabs of the battery cell under test for testing. Testing modules 500 in different pairs are spaced apart in the X-direction. In other words, by setting up multiple sets of testing modules 500, multiple battery cells under test can be tested simultaneously.
[0054] More specifically, the stage 300 is provided with a plurality of elongated first limiting members 310. These first limiting members 310 are arranged parallel to the Y-direction and spaced apart in the X-direction, forming an accommodating space 320 between adjacent first limiting members 310. This accommodating space 320 is configured to accommodate the battery cell under test. Two adjacent first limiting members 310 can abut and limit the relative sides of the battery cell under test located within the corresponding accommodating space 320 in the X-direction.
[0055] Preferably, the spacing between adjacent first limiting members 310 in the X direction is adjustable. Each first limiting member 310 has a first oblong hole, the major axis of which is parallel to the X direction. A first bolt passes through the first oblong hole and is fixed in a first preset hole on the stage 300 to secure the first limiting member 310 on the stage 300. The position of the first bolt in the major axis direction of the first oblong hole is adjustable, allowing for fine-tuning of the position of the first limiting member 310 in the X direction, and thus adjustment of the spacing between adjacent first limiting members 310 to accommodate the limiting of test cells of different widths.
[0056] More specifically, the stage 300 is provided with a plurality of elongated, plate-shaped second limiting members 340. In this embodiment, there are two second limiting members 340, which are arranged parallel to the X direction and spaced apart in the Y direction. The two tabs of the battery cell under test can respectively overlap the two second limiting members 340 along its length. The second limiting member 340 is configured to support the tabs, so as to ensure the stability of the tabs when the probe 510 presses against them.
[0057] Preferably, the second limiting member 340 is adjustable in the Y direction. Specifically, the second limiting member 340 has a second oblong hole, the major axis of which is parallel to the Y direction. A second bolt passes through the second oblong hole and is fixed in a second preset hole on the stage 300 to fix the second limiting member 340 on the stage 300. The second bolt is adjustable in the major axis direction of the second oblong hole, thereby enabling fine adjustment of the position of the second limiting member 340 in the Y direction, and further enabling adjustment of the distance between two adjacent second limiting members 340 to accommodate the limiting of test cells of different lengths.
[0058] More specifically, the stage 300 is provided with a plurality of rectangular sheet-like insulating members 330, each corresponding to a probe 510 and located below the probe 510 in the Z direction. The insulating member 330 supports the tab of the battery cell under test, and the probe 510 can press the tab of the battery cell under test against the insulating member 330. The insulating member 330 provides insulation between the tab and the stage 300. In this embodiment, the insulating member 330 is specifically disposed on the second limiting member 340, and insulating members 330 located on the same side in the Y direction are disposed on the same second limiting member 340, with the plurality of insulating members 330 spaced apart. This arrangement avoids problems such as electrical connection issues caused by contact between the tabs of different battery cells under test.
[0059] Continue to refer to Figure 2 and Figure 3The DCIR testing fixture also includes a guide rail 800. The guide rail 800 is mounted on the base 100 along the X-direction, with one portion extending into the testing station and the other portion extending out. The stage 300 slides along the guide rail 800, allowing it to move into the testing station. The guide rail 800 facilitates adjustments to the positions of the first limiting member 310 and the second limiting member 340, as well as the placement of the battery cell to be tested, outside the testing station, thus expanding the operating space and reducing operational difficulty.
[0060] Preferably, there are multiple guide rails 800, which are spaced apart in the Y direction, and the platform 300 is slidably mounted on the multiple guide rails 800. In this embodiment, there are specifically two guide rails 800, thereby providing more stable support for the platform 300.
[0061] Continue to refer to Figures 2-4 The displacement mechanism 400 includes a displacement base 410 and multiple displacement plates 420. The displacement base 410 is adjustablely spaced from the top cover 200 in the Z direction. The displacement plates 420 are connected to the displacement base 410, and the probes 510 are correspondingly disposed on the displacement plates 420. The displacement plates 420 can drive the probes 510 to move in the Z direction.
[0062] Specifically, the DCIR testing fixture also includes a drive device 600. The drive end of the drive device 600 is disposed on the base 100, and the output end of the drive device 600 is connected to the side of the displacement base 410 facing the stage 300. The output end can extend and retract relative to the drive end, thereby driving the displacement base 410 to move in the Z direction, so as to drive the displacement mechanism 400 to move between the stage 300 and the top cover 200. In this embodiment, the drive device 600 can be a cylinder or the like, and its structure and principle will not be described in detail here.
[0063] Preferably, two drive devices 600 are configured. The two drive devices 600 are spaced apart in the Y direction and both are mounted on the base 100. The platform 300 is located between the two drive devices 600. It should be noted that the position of the drive devices 600 on the base 100 is adjustable, allowing for flexible adjustment of the distance between the two drive devices 600 according to the position and size of the platform, thereby increasing the usability.
[0064] More specifically, the DCIR testing fixture also includes a guide slide rod 700. This guide slide rod connects the base 100 and the top cover 200 along the Z-direction, and the displacement base 410 is slidably connected to the guide slide rod 700. The guide slide rod 700 provides guidance and limiting functions when the displacement base 410 moves along the Z-direction, preventing the displacement base 410 from shaking and causing misalignment between the probe 510 and the tab.
[0065] Preferably, multiple guide slide rods 700 are provided; in this embodiment, four guide slide rods 700 are specifically provided. The four guide slide rods 700 are arranged in a rectangular array on the base 100 and are respectively slidably inserted at the four apex corners of the displacement base 410. Through the above arrangement, the stability of the displacement base 410 when moving in the Z direction can be effectively improved, and the displacement base 410 can be limited in the X and Y directions.
[0066] More specifically, the displacement mechanism 400 further includes a connector 430 with a rectangular plate structure. The displacement plate 420 is spaced apart from the displacement base 410 via two parallel and spaced-apart connectors 430. The detection module 500 also includes a sleeve 520 and a telescopic rod 530. The sleeve 520 is connected to the top cover 200 and extends through the displacement plate 420. The telescopic rod 530 is connected to the probe 510 and is telescopically connected to the sleeve 520. When the probe 510 presses against the tab of the battery cell under test, the telescopic rod 530 can partially retract into the sleeve 520. The sleeve 520 and the telescopic rod 530 provide the detection module 500 with a flexible range of movement in the Z direction when the probe 510 presses against the tab of the battery cell under test.
[0067] More specifically, the testing module 500 also includes a guide rod 540 and an elastic element 550. The guide rod 540 is arranged along the Z-direction, with one end slidably mounted on the displacement plate 420 and the other end connected to the probe 510. The elastic element 550 is sandwiched between the probe 510 and the displacement plate 420. When the probe 510 presses against the tab of the battery cell under test, the elastic element 550 can be compressed. When the probe 510 moves upward in the Z-direction and disengages from the tab of the battery cell under test, the elastic element 550 can return to its original shape. The guide rod 540 can limit the movement of the probe 510, preventing it from shifting or misaligning. The elastic element 550 can reduce the rigidity of the probe 510 during movement, preventing damage to both the probe 510 and the tab from impacting each other.
[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A DCIR testing fixture, characterized in that, include: A base (100) and a top cover (200), wherein the top cover (200) is spaced apart from the base (100) in the Z direction, forming a testing station between the top cover (200) and the base (100); A stage (300) is positioned at the testing station and configured to support the battery cell to be tested. A displacement mechanism (400) is movably disposed in the Z direction between the platform (300) and the top cover (200); A detection module (500) is connected to the displacement mechanism (400). The detection connection line of the detection module (500) is connected to the top cover (200). The probe (510) of the detection module (500) can move with the displacement mechanism (400) and can move in the Z direction to press against the tab of the battery cell to be tested at the detection station, or release the pressure on the tab.
2. The DCIR testing fixture according to claim 1, characterized in that, The displacement mechanism (400) includes a displacement base (410) and a displacement plate (420). The displacement base (410) is adjustablely spaced from the top cover (200) in the Z direction. The displacement plate (420) is connected to the displacement base (410), and the probe (510) is disposed on the displacement plate (420).
3. The DCIR testing fixture according to claim 2, characterized in that, The displacement mechanism (400) further includes a connector (430), and the displacement plate (420) is spacedly connected to the displacement base (410) through the connector (430); The detection module (500) further includes a sleeve (520) and a telescopic rod (530). The sleeve (520) is connected to the top cover (200) and passes through the displacement plate (420). The telescopic rod (530) is connected to the probe (510) and is telescopically connected to the sleeve (520). When the probe (510) presses against the tab of the battery cell to be tested, the telescopic rod (530) can partially retract into the sleeve (520).
4. The DCIR testing fixture according to claim 2, characterized in that, The detection module (500) further includes a guide rod (540) and an elastic element (550). The guide rod (540) is arranged along the Z direction. One end of the guide rod (540) is slidably disposed on the displacement plate (420), and the other end is connected to the probe (510). The elastic element (550) is sandwiched between the probe (510) and the displacement plate (420). When the probe (510) presses against the tab of the battery cell to be tested, the elastic element (550) is compressed.
5. The DCIR testing fixture according to claim 1, characterized in that, The DCIR testing fixture also includes a driving device (600), the driving end of which is disposed on the base (100), and the output end of which is connected to the displacement mechanism (400) for driving the displacement mechanism (400) to move between the stage (300) and the top cover (200). A guide slide rod (700) is connected between the base (100) and the top cover (200) along the Z direction, and the displacement mechanism (400) is slidably connected to the guide slide rod (700).
6. The DCIR testing fixture according to claim 1, characterized in that, The DCIR testing fixture also includes a guide rail (800), which is disposed on the base (100) along the X direction. A portion of the guide rail (800) extends into the testing station. The stage (300) is slidably engaged with the guide rail (800) and can move along the guide rail (800) into the testing station. The X direction is perpendicular to the Z direction.
7. The DCIR testing fixture according to claim 1, characterized in that, The stage (300) is provided with a plurality of first limiting members (310), which are spaced apart in the X direction. Adjacent first limiting members (310) form an accommodating space (320), which is configured to accommodate the battery cell to be tested.
8. The DCIR test fixture according to claim 7, characterized in that, The spacing between adjacent first limiting members (310) in the X direction is adjustable.
9. The DCIR testing fixture according to any one of claims 1-8, characterized in that, An insulating component (330) is provided on the stage (300). The insulating component (330) is used to support the tab of the battery cell to be tested. The probe (510) is used to press the tab of the battery cell to be tested against the insulating component (330).
10. A DCIR testing production line, characterized in that, Includes the DCIR test fixture as described in any one of claims 1-9, wherein the base (100) is fixedly mounted on the machine tool (10) of the DCIR test production line.