Nondestructive lithium precipitation detection device for lithium battery

Abstract

The utility model discloses a lithium battery lossless lithium precipitation detection device, which comprises a base, the top of the base is fixedly connected with a detection main body, the top of the base is provided with a detection mechanism, the detection mechanism comprises an electric telescopic rod, the top of the electric telescopic rod is fixedly connected with a piston rod, and the piston rod is arranged on the base. According to the nondestructive lithium precipitation detection device for the lithium battery, the detection mechanism is connected with the detection main body through the detection clamp and the signal line, and the detection clamp is connected with the detection main body through the detection clamp and the signal line; aC signals required by electrochemical impedance spectroscopy (EIS) detection can be accurately applied, and impedance response of the lithium battery can be accurately received. According to the impedance change under different frequencies, the tiny lithium precipitation condition in the lithium battery can be sensitively perceived, so that the lithium precipitation detection precision is greatly improved, potential problems can be timely found, and the stable performance of the lithium battery is ensured.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing technology, specifically a non-destructive lithium plating detection device for lithium batteries. Background Technology

[0002] In modern energy systems, lithium batteries are widely used in electric vehicles, energy storage systems, and various portable electronic devices due to their advantages such as high energy density and long cycle life. However, lithium plating often occurs during frequent charging and discharging of lithium batteries. Lithium plating not only leads to rapid capacity decay, significantly shortening battery life and increasing replacement costs, but more seriously, if the lithium dendrites generated by lithium plating continue to grow, they are very likely to puncture the battery separator, causing an internal short circuit, which can lead to overheating or even fire and explosion, posing a serious threat to the life and property safety of users.

[0003] Traditional lithium battery lithium plating detection methods have many limitations. For example, while microscopic testing after disassembling the battery can visually observe lithium dendrites, the battery cannot be used again after disassembly. This is too costly and impractical for battery packs used in large-scale applications. On the other hand, some detection methods based on appearance or simple electrical parameters have low detection accuracy and cannot detect early signs of lithium plating inside the battery in a timely and accurate manner, making it difficult to meet the stringent requirements for battery safety and performance reliability in practical applications.

[0004] Therefore, this utility model provides a non-destructive lithium plating detection device for lithium batteries. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a non-destructive lithium plating detection device for lithium batteries, thereby solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a non-destructive lithium plating detection device for lithium batteries, comprising a base, a detection body fixedly connected to the top of the base, and a detection mechanism provided on the top of the base;

[0007] The testing mechanism includes an electric telescopic rod, a piston rod fixedly connected to the top of the electric telescopic rod, a workpiece plate fixedly connected to the top of the piston rod, a bidirectional motor inside the base, a lead screw fixedly connected to the output end of the bidirectional motor, a collar threaded to the outer side of the lead screw, a slide rod fixedly connected to the top of the collar, a moving block fixedly connected to the top of the slide rod, a connecting rod fixedly connected to the top of the moving block, a detection clamp fixedly connected to the top of the connecting rod, a signal line fixedly connected to the outer side of the detection clamp, a moving groove inside the base, and a control switch on the outer side of the base.

[0008] Preferably, a positioning mechanism is provided on the top of the workpiece plate. The positioning mechanism includes a gantry frame, a movable tube is fixedly connected to the top of the gantry frame, a moving rod is movably connected inside the movable tube, a pulling cover is fixedly connected to the top of the moving rod, a compression spring is fixedly connected to the moving rod, a positioning plate is fixedly connected to the bottom of the moving rod, and a buffer pad is fixedly connected to the bottom of the positioning plate.

[0009] Preferably, the electric telescopic rod is fixedly connected to the top of the base, and the workpiece plate is movably connected above the base via a piston rod.

[0010] Preferably, the output ends of the bidirectional motor are in opposite directions, and the lead screws are symmetrically distributed on the outside of the bidirectional motor.

[0011] Preferably, the slide bar is slidably connected inside the moving groove, and the moving block is slidably connected to the top of the base.

[0012] Preferably, the detection clips are symmetrically distributed on the outer side of the workpiece plate, and the end of the signal line away from the detection clips is fixedly connected to the inside of the detection body.

[0013] Preferably, the gantry frame is fixed and symmetrically distributed on the top of the workpiece plate, and the moving rod is movably connected to the inside of the moving tube by a compression spring.

[0014] Preferably, the number of positioning plates and buffer pads are the same, and the positioning plates and buffer pads are symmetrically distributed on the top of the workpiece plate.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The non-destructive lithium plating detection device for this lithium battery connects the detection mechanism to the detection body via a detection clip and a signal line. It can accurately apply the AC signal required for electrochemical impedance spectroscopy (EIS) detection and accurately receive the impedance response of the lithium battery. Based on the impedance changes at different frequencies, it can keenly detect subtle lithium plating inside the lithium battery, greatly improving the accuracy of lithium plating detection, helping to discover potential problems in a timely manner, and ensuring the stable performance of the lithium battery.

[0018] (2) The non-destructive lithium plating detection device for this lithium battery features an electric telescopic rod that automatically adjusts the height of the workpiece plate, and a bidirectional motor that drives the lead screw to automatically bring the detection clamp closer to and clamp the lithium battery. This eliminates the need for manual, precise operation and greatly simplifies the detection process. The positioning mechanism automatically presses the lithium battery with a compression spring, and the operator only needs to simply lift and pull the cover to complete the positioning, making the operation convenient and significantly improving detection efficiency. Attached Figure Description

[0019] Figure 1This is a perspective view of the present invention;

[0020] Figure 2 This is a schematic diagram of the external structure of the bidirectional motor of this utility model;

[0021] Figure 3 This is a schematic diagram of the outer side of the workpiece plate of this utility model;

[0022] Figure 4 This is an enlarged view of the structure at point A in this utility model 3.

[0023] In the diagram: 1. Base; 2. Detection body; 3. Detection mechanism; 31. Electric telescopic rod; 32. Piston rod; 33. Workpiece plate; 34. Bidirectional motor; 35. Lead screw; 36. Collar; 37. Slide rod; 38. Moving block; 39. Connecting rod; 310. Detection clamp; 311. Signal line; 312. Moving groove; 313. Control switch; 4. Positioning mechanism; 41. Gantry frame; 42. Movable tube; 43. Moving rod; 44. Pull cover; 45. Compression spring; 46. Positioning plate; 47. Buffer pad. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 A non-destructive lithium plating detection device for lithium batteries includes a base 1, a detection body 2 fixedly connected to the top of the base 1, and a detection mechanism 3 provided on the top of the base 1.

[0026] The testing mechanism 3 includes an electric telescopic rod 31, a piston rod 32 fixedly connected to the top of the electric telescopic rod 31, a workpiece plate 33 fixedly connected to the top of the piston rod 32, a bidirectional motor 34 is installed inside the base 1, a lead screw 35 is fixedly connected to the output end of the bidirectional motor 34, a collar 36 is threadedly connected to the outside of the lead screw 35, a slide rod 37 is fixedly connected to the top of the collar 36, a moving block 38 is fixedly connected to the top of the slide rod 37, a connecting rod 39 is fixedly connected to the top of the moving block 38, a detection clamp 310 is fixedly connected to the top of the connecting rod 39, a signal line 311 is fixedly connected to the outside of the detection clamp 310, a moving groove 312 is opened inside the base 1, and a control switch 313 is installed on the outside of the base 1.

[0027] Furthermore: the electric telescopic rod 31 is fixedly connected to the top of the base 1, the workpiece plate 33 is movably connected to the top of the base 1 via the piston rod 32, the output ends of the bidirectional motor 34 are in opposite directions, the lead screw 35 is symmetrically distributed on the outside of the bidirectional motor 34, the slide rod 37 is slidably connected to the inside of the moving groove 312, the moving block 38 is slidably connected to the top of the base 1, the detection clamp 310 is symmetrically distributed on the outside of the workpiece plate 33, and the end of the signal line 311 away from the detection clamp 310 is fixedly connected to the inside of the detection body 2.

[0028] It should be noted that: after the detection clamp 310 contacts the lithium battery, the bidirectional motor 34 continues to be adjusted to make the detection clamp 310 firmly clamp the two ends of the lithium battery. The signal line 311 fixedly connected to the outside of the detection clamp 310 connects the detection clamp 310 to the detection circuit inside the detection body 2. The detection body 2 applies a small-amplitude AC signal required for electrochemical impedance spectroscopy (EIS) detection to the lithium battery through the detection clamp 310 and receives the impedance response signal of the lithium battery. Based on the impedance change at different frequencies, it analyzes and judges whether lithium plating exists in the lithium battery and the degree of lithium plating. At the same time, if the detection body 2 also has the function of combined X-ray tomography CT imaging auxiliary detection, the relevant equipment will be started at the same time to perform multi-angle scanning detection on the lithium battery and obtain internal structural images to further determine the lithium plating situation. The FPGA / ASIC chip built into the detection body (2) processes the projection data collected by the detector in real time and generates a two-dimensional tomographic image and a three-dimensional model inside the lithium battery through the filtered back projection algorithm (FBP) or iterative reconstruction algorithm (such as ART). The system automatically marks areas of density anomalousness (lithium dendrites appear as high-brightness needle-like or tree-like structures) and cross-validates them with electrochemical impedance spectroscopy (EIS) detection results.

[0029] As a further improvement of this utility model, a positioning mechanism 4 is provided on the top of the workpiece plate 33. The positioning mechanism 4 includes a gantry frame 41. A movable tube 42 is fixedly connected to the top of the gantry frame 41. A moving rod 43 is movably connected inside the movable tube 42. A pulling cover 44 is fixedly connected to the top of the moving rod 43. A compression spring 45 is fixedly connected to the moving rod 43. A positioning plate 46 is fixedly connected to the bottom of the moving rod 43. A buffer pad 47 is fixedly connected to the bottom of the positioning plate 46.

[0030] Furthermore: the gantry 41 is fixed and symmetrically distributed on the top of the workpiece plate 33, the moving rod 43 is movably connected to the inside of the moving tube 42 through the compression spring 45, the number of positioning plates 46 and buffer pads 47 is the same, and the positioning plates 46 and buffer pads 47 are symmetrically distributed on the top of the workpiece plate 33.

[0031] It should be noted that after the lithium battery is placed on the workpiece plate 33, the positioning mechanism 4 begins to function. The gantry 41 is symmetrically fixed on the top of the workpiece plate 33. The movable rod 43 is movably connected inside the movable tube 42 at the top of the gantry 41. The top of the movable rod 43 is fixed with a pull cover 44, which makes it convenient for the operator to lift the movable rod 43. A compression spring 45 is sleeved on the movable rod 43. In the initial state, the compression spring 45 is in a naturally extended state.

[0032] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0033] Working principle: When a non-destructive lithium plating test is required on a lithium battery, the electric telescopic rod 31 is first activated by the control switch 313. The electric telescopic rod 31 starts working, and the piston rod 32 at its top extends upward, driving the connected workpiece plate 33 to rise to a suitable height, providing a support platform for placing the lithium battery.

[0034] Subsequently, the bidirectional motor 34 is activated, and its output rotates in opposite directions, causing the lead screws 35, symmetrically distributed on its outer side, to rotate synchronously. Since the lead screws 35 and the collar 36 are threadedly connected, the collar 36 moves linearly along the axial direction of the lead screw 35 under its rotation. The slide bar 37, fixedly connected to the top of the collar 36, slides within the moving groove 312 inside the base 1, acting as a guide to ensure smooth movement of the collar 36. As the collar 36 moves, the moving block 38 at the top of the slide bar 37 slides synchronously on the top of the base 1, thereby driving the connecting rod 39 and the detection clamp 310 fixed to the top of the connecting rod 39 closer to the lithium battery.

[0035] When the operator pulls the pull cover 44 upwards, the moving rod 43 moves upwards within the movable tube 42, at which point the compression spring 45 is compressed. After the lithium battery is placed in a suitable position on the workpiece plate 33, the pull cover 44 is released. Under the elastic force of the compression spring 45, the moving rod 43 moves downwards, and the positioning plate 46 fixed to the bottom of the moving rod 43 descends accordingly until the buffer pad 47 at the bottom of the positioning plate 46 contacts and presses against the top of the lithium battery. The positioning plate 46 and the buffer pad 47 are symmetrically distributed on the top of the workpiece plate 33, positioning and fixing the lithium battery from multiple directions to prevent displacement of the lithium battery during the testing process. This ensures that the testing clamp 310 can accurately clamp the lithium battery, while the buffer pad 47 prevents the positioning plate 46 from damaging the lithium battery, ensuring the stability and accuracy of the testing process.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-destructive lithium plating detection device for lithium batteries, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to the detection body (2), and the top of the base (1) is provided with a detection mechanism (3); The testing mechanism (3) includes an electric telescopic rod (31), a piston rod (32) is fixedly connected to the top of the electric telescopic rod (31), a workpiece plate (33) is fixedly connected to the top of the piston rod (32), a bidirectional motor (34) is provided inside the base (1), a lead screw (35) is fixedly connected to the output end of the bidirectional motor (34), a collar (36) is threaded to the outside of the lead screw (35), a slide rod (37) is fixedly connected to the top of the collar (36), a moving block (38) is fixedly connected to the top of the slide rod (37), a connecting rod (39) is fixedly connected to the top of the moving block (38), a detection clamp (310) is fixedly connected to the top of the connecting rod (39), a signal line (311) is fixedly connected to the outside of the detection clamp (310), a moving groove (312) is opened inside the base (1), and a control switch (313) is provided on the outside of the base (1).

2. The non-destructive lithium plating detection device for lithium batteries according to claim 1, characterized in that: The top of the workpiece plate (33) is provided with a positioning mechanism (4). The positioning mechanism (4) includes a gantry frame (41). The top of the gantry frame (41) is fixedly connected to a movable tube (42). The inside of the movable tube (42) is movably connected to a moving rod (43). The top of the moving rod (43) is fixedly connected to a pulling cover (44). A compression spring (45) is fixedly connected to the moving rod (43). The bottom of the moving rod (43) is fixedly connected to a positioning plate (46). The bottom of the positioning plate (46) is fixedly connected to a buffer pad (47).

3. The non-destructive lithium plating detection device for lithium batteries according to claim 1, characterized in that: The electric telescopic rod (31) is fixedly connected to the top of the base (1), and the workpiece plate (33) is movably connected above the base (1) via the piston rod (32).

4. The non-destructive lithium plating detection device for lithium batteries according to claim 1, characterized in that: The output ends of the bidirectional motor (34) are in opposite directions, and the lead screw (35) is symmetrically distributed on the outside of the bidirectional motor (34).

5. The non-destructive lithium plating detection device for lithium batteries according to claim 1, characterized in that: The slide bar (37) is slidably connected inside the moving groove (312), and the moving block (38) is slidably connected to the top of the base (1).

6. The non-destructive lithium plating detection device for lithium batteries according to claim 1, characterized in that: The detection clips (310) are symmetrically distributed on the outside of the workpiece plate (33), and the end of the signal line (311) away from the detection clips (310) is fixedly connected to the inside of the detection body (2).

7. The non-destructive lithium plating detection device for lithium batteries according to claim 2, characterized in that: The gantry (41) is fixed and symmetrically distributed on the top of the workpiece plate (33), and the moving rod (43) is movably connected to the inside of the moving tube (42) by a compression spring (45).

8. The non-destructive lithium plating detection device for lithium batteries according to claim 2, characterized in that: The number of positioning plates (46) and buffer pads (47) is the same, and the positioning plates (46) and buffer pads (47) are symmetrically distributed on the top of the workpiece plate (33).

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