Detection device

Abstract

The utility model discloses a detection device which comprises a support and an acquisition assembly, and the support is used for bearing a battery to be detected. The collection assembly comprises a pricking needle, a gas collection part, a first valve and a second valve, the pricking needle is slidably arranged on the support, a through hole penetrating through the pricking needle is formed in the pricking needle, the pricking needle is used for being inserted into a to-be-detected battery, a gas collection cavity, a first opening and a second opening are formed in the gas collection part, and the gas collection cavity is communicated with the through hole through the first opening; the first valve is arranged on the gas collecting part and used for controlling opening and closing of the first opening, and the second valve is arranged on the gas collecting part and used for controlling opening and closing of the second opening. The detection device is convenient for detecting the gas production rate of the steel shell small cylindrical lithium ion battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a detection device. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, and energy storage systems, and their gas production is a crucial indicator for evaluating battery performance and safety. Currently, for pouch lithium-ion batteries, various methods and equipment exist for collecting and measuring gas production. However, for small cylindrical lithium-ion batteries with steel casings, such as 18650 and 21700 batteries, due to their unique structure and sealed packaging, specialized gas collection and measurement devices are lacking. This prevents the visualization and quantitative analysis of gas production in small cylindrical lithium batteries, limiting the comprehensiveness of battery performance evaluation and impacting guidance for subsequent experiments and production. Utility Model Content

[0003] One objective of this invention is to provide a detection device that addresses the technical problem of easily detecting the gas production of small cylindrical lithium-ion batteries with steel casings.

[0004] To achieve the above objectives, the present invention provides a solution: a detection device, characterized in that it includes: a support and a collection component, the support being used to support the battery to be tested. The collection component includes a needle, a gas collecting section, a first valve, and a second valve. The needle is slidably disposed on the support, and the needle has a through hole extending through itself. The needle is used to insert into the battery to be tested. The gas collecting section forms a gas collecting chamber and a first opening and a second opening communicating with the gas collecting chamber. The gas collecting chamber is connected through the first opening and the through hole. The first valve is disposed on the gas collecting section to control the opening and closing of the first opening, and the second valve is disposed on the gas collecting section to control the opening and closing of the second opening.

[0005] Optionally, the support has a positioning groove for placing the battery, and the needle is slidably disposed on the support in a direction close to or away from the positioning groove.

[0006] Optionally, the support includes a base and a limiting part. The base has a positioning groove, the limiting part is disposed in the base, and the limiting part and the base enclose a placement cavity. The placement cavity is connected to the positioning groove, and an insertion port is provided at the end of the placement cavity away from the positioning groove. The needle is slidably disposed in the base along the direction close to or away from the placement cavity.

[0007] Optionally, the detection device includes a drive assembly, which includes a drive rod threadedly connected to a support, and a needle disposed on the drive rod.

[0008] Optionally, the drive assembly includes a slider, the support includes a base and a guide, the guide is disposed on the base, the slider is rotatably disposed on the drive rod and slidably disposed on the guide, and the needle is disposed on the slider.

[0009] Optionally, the collection component includes an air supply pipe, one end of which is disposed on the slider and the other end is connected to the air collection unit. The through hole and the first opening are connected through the air supply pipe, which is used to support the air collection unit.

[0010] Optionally, the acquisition component includes a sealing part that covers the outer peripheral surface of the needle. When the needle is inserted into the battery under test, the sealing part is used to seal the gap between the needle and the battery under test.

[0011] Optionally, in the direction of needle extension, towards the first opening, the diameter of the sealing part gradually increases.

[0012] Optionally, the acquisition component includes a water supply pipe and a water storage section. The water storage section is located on the support and has a water storage cavity. One end of the water supply pipe is connected to a second opening, and the other end is connected to the water storage cavity.

[0013] Optionally, the gas collecting section has a third opening that communicates with the gas collecting chamber, and the third opening and the second opening are respectively located at opposite ends of the gas collecting section;

[0014] The collection component includes a third valve, which is located in the gas collection section to control the opening and closing of the third opening.

[0015] The beneficial effects of this utility model are as follows:

[0016] The testing device includes a support and a data collection assembly. The support supports the battery under test. The data collection assembly includes a needle, a gas collecting section, a first valve, and a second valve. The needle is slidably mounted on the support and has a through hole. The needle is inserted into the battery under test. The gas collecting section has a gas collecting chamber and a first opening and a second opening communicating with the gas collecting chamber. The gas collecting chamber is connected to the through hole through the first opening. The first valve is located in the gas collecting section to control the opening and closing of the first opening, and the second valve is located in the gas collecting section to control the opening and closing of the second opening.

[0017] In practical applications, the gas collecting section is equipped with graduations, and the first and second openings are located at the same end of the gas collecting section. When testing the internal gas volume of a battery, the battery under test is placed on a support, and the gas collecting chamber is filled with water. Then, the first and second valves are closed. Next, with the end of the gas collecting chamber furthest from the second opening higher than the end with the second opening, a needle is inserted into the battery under test, and the first and second valves are opened. At this point, the gas collecting chamber is connected to the external environment through the second opening. The pressure inside the gas collecting chamber is atmospheric pressure, while the internal gas pressure of the battery under test is greater than the pressure inside the gas collecting chamber. This causes the gas inside the battery to enter the gas collecting chamber through the through-hole and the first opening, rising to the higher end of the gas collecting chamber until the internal gas pressure of the battery under test equals atmospheric pressure. At this point, the first and second valves are closed, and the volume of gas collected in the gas collecting chamber is the volume of the gas inside the battery under test. The tester can determine the volume of the gas inside the battery by observing the graduations, and the residual gas volume inside the battery at this point is negligible. This testing device facilitates the collection of gas from inside the battery under test. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the detection device provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the detection device provided in this embodiment of the utility model;

[0021] Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle.

[0022] Explanation of icon numbers:

[0023] 20. Support; 21. Positioning groove; 22. Limiting part; 23. Insertion port; 24. Placement cavity; 25. Guide part; 26. Base; 30. Collection component; 31. Needle; 311. Through hole; 32. Gas collection part; 321. Gas collection chamber; 322. First opening; 323. Second opening; 324. Third opening; 33. First valve; 34. Second valve; 35. Gas supply pipe; 36. Sealing part; 37. Water supply pipe; 38. Water storage part; 381. Water storage chamber; 39. Third valve; 40. Drive component; 41. Drive rod; 42. Slider. 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 Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the overall structure of the detection device provided in this embodiment of the utility model. Figure 2 This is a schematic diagram of the overall structure of the detection device provided in this embodiment of the utility model. Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle.

[0026] This utility model provides a testing device, including a support 20 and a data acquisition component 30. The support 20 is used to support a battery to be tested. The data acquisition component 30 includes a needle 31, a gas collecting section 32, a first valve 33, and a second valve 34. The needle 31 is slidably disposed on the support 20 and has a through hole 311 extending through itself. The needle 31 is used to insert into the battery to be tested. The gas collecting section 32 forms a gas collecting chamber 321 and a first opening 322 and a second opening 323 communicating with the gas collecting chamber 321. The gas collecting chamber 321 is connected to the through hole 311 through the first opening 322. The first valve 33 is disposed in the gas collecting section 32 to control the opening and closing of the first opening 322, and the second valve 34 is disposed in the gas collecting section 32 to control the opening and closing of the second opening 323.

[0027] In practical applications, the gas collecting section 32 is equipped with graduations, and the first opening 322 and the second opening 323 are located at the same end of the gas collecting section 32. When testing the internal gas volume of the battery, the battery to be tested is placed on the support 20, and the gas collecting chamber 321 is filled with water. Then, the first valve 33 and the second valve 34 are closed. Next, with the end of the gas collecting chamber 321 away from the second opening 323 higher than the end with the second opening 323, a needle 31 is inserted into the battery to be tested, and the first valve 33 and the second valve 34 are opened. At this time, the gas collecting chamber 321 is connected to the external environment through the second opening 323. The pressure inside the gas collecting chamber 321 is atmospheric pressure, while the gas pressure inside the battery to be tested is greater than the pressure inside the gas collecting chamber 321. This causes the gas inside the battery to enter the gas collecting chamber 321 through the through hole 311 and the first opening 322, and rise to the higher end of the gas collecting chamber 321 until the gas pressure inside the battery to be tested is equal to the atmospheric pressure. At this point, closing the first valve 33 and the second valve 34, the volume of gas collected in the gas collecting chamber 321 is the volume of gas inside the battery under test. The tester can determine the volume of gas inside the battery by observing the scale, while the volume of residual gas inside the battery at this time is negligible. The detection device facilitates the collection of gas from inside the battery under test by the tester.

[0028] Further, see Figure 1 The support 20 has a positioning groove 21 for placing the battery, and the needle 31 is slidably disposed on the support 20 in a direction close to or away from the positioning groove 21.

[0029] In practical applications, the battery under test is placed in the positioning groove 21, which accurately positions the battery and ensures that it remains in a stable position throughout the testing process, thus avoiding errors caused by improper battery positioning. Simultaneously, the piercing needle 31 can slide towards or away from the positioning groove 21 under its guidance, allowing for precise control of its position and insertion angle when inserting the battery. This improves the accuracy of the piercing needle insertion and ensures the stability and accuracy of the testing process.

[0030] Further, see Figure 1 The support 20 includes a base 26 and a limiting part 22. The base 26 has a positioning groove 21. The limiting part 22 is disposed on the base 26. The limiting part 22 and the base 26 enclose a placement cavity 24. The placement cavity 24 is connected to the positioning groove 21. An insertion port 23 is provided at the end of the placement cavity 24 away from the positioning groove 21. The needle 31 is slidably disposed on the base 26 in a direction close to or away from the placement cavity 24.

[0031] In practical applications, the battery under test is placed in the placement cavity 24 and positioning groove 21 through the insertion part. The limiting part 22 abuts against the battery under test, which further improves the positioning and fixing accuracy of the battery under test, effectively ensuring the stable position of the battery under test during the testing process, preventing the battery from shifting or being improperly placed, thereby reducing the testing error caused by inaccurate positioning. In addition, the piercing needle 31 is slidably disposed on the base 26, ensuring that its position can be flexibly adjusted when needed, so that the piercing needle 31 can make more precise contact with the battery during insertion, further improving the stability of the battery under test during the testing process.

[0032] In one embodiment, see Figure 1 The detection device includes a drive assembly 40, which includes a drive rod 41. The drive rod 41 is threadedly connected to the support 20, and the needle 31 is disposed on the drive rod 41.

[0033] In practical applications, the threaded connection structure of the drive rod 41 allows the needle 31 to slide precisely along a predetermined direction within the support 20 by rotating the drive rod 41, ensuring that the needle 31 is inserted into the battery under test at an accurate angle and depth. This design not only improves the stability and reliability of needle 31 insertion but also allows for fine-tuning of the insertion depth by adjusting the rotation of the drive rod 41 to meet the requirements of different battery specifications. This technical solution enhances the adjustability and flexibility of the testing process and ensures the accuracy of gas volume measurement.

[0034] Further, see Figure 1 The drive assembly 40 includes a slider 42, the support 20 includes a base 26 and a guide 25, the guide 25 is disposed on the base 26, the slider 42 is rotatably disposed on the drive rod 41 and slidably disposed on the guide 25, and the needle 31 is disposed on the slider 42.

[0035] In practical applications, the rotating drive rod 41 drives the slider 42 to slide along the length of the guide portion 25, and the slider 42 drives the needle 31 to slide along the length of the guide portion 25. The sliding of the slider 42 in the guide portion 25 makes the insertion path of the needle 31 more stable, avoiding possible deviation or instability of the needle 31 during the sliding process.

[0036] Furthermore, referring to Figure 1 The collection component 30 includes an air supply pipe 35. One end of the air supply pipe 35 is disposed on the slider 42, and the other end is connected to the gas collection part 32. The through hole 311 and the first opening 322 are connected through the air supply pipe 35. The air supply pipe 35 is used to support the gas collection part 32.

[0037] In practical applications, by setting up the gas supply pipe 35, the position of the gas collecting section 32 can be effectively fixed, thereby ensuring that the end of the gas collecting chamber 321 furthest from the second opening 323 is always higher than the end with the second opening 323. This design helps maintain the correct orientation of the gas collecting chamber 321, ensuring that gas flows smoothly from inside the battery under test into the gas collecting section 32 and preventing positional shifts during gas collection. Furthermore, the fixing effect of the gas supply pipe 35 makes the gas collecting section 32 more stable during testing, facilitating accurate measurement of the gas volume of the battery under test by the testing personnel.

[0038] In one embodiment, reference is made to Figure 3 The acquisition component 30 includes a sealing part 36, which covers the outer peripheral surface of the needle 31. When the needle 31 is inserted into the battery under test, the sealing part 36 is used to seal the gap between the needle 31 and the battery under test.

[0039] In practical applications, the needle 31 is inserted into the battery under test until the sealing part 36 abuts against the outer peripheral surface of the battery, thereby sealing the gap between the needle 31 and the battery. By providing the sealing part 36 on the outer peripheral surface of the needle 31, the gap between the needle 31 and the battery under test can be effectively sealed, preventing gas leakage during needle insertion. This design ensures that gas can flow completely from inside the battery under test into the gas collection chamber 321, improving the accuracy and reliability of the detection.

[0040] Furthermore, referring to Figure 3 In the direction of extension of the needle 31, towards the direction of approaching the first opening 322, the diameter of the sealing part 36 gradually increases.

[0041] In practical applications, the sealing part 36 is partially inserted into the battery under test, thereby increasing the contact area between the piercing needle 31 and the battery under test, and better sealing the gap between the piercing needle 31 and the battery under test. This ensures that when the piercing needle 31 is inserted into the battery, the sealing part 36 can fully adapt to the shape changes of the battery surface, improve the sealing performance, reduce the entry of external air into the gas collecting chamber 321, and ensure the accuracy of the test results.

[0042] In one embodiment, reference is made to Figure 1 and Figure 2 The acquisition component 30 includes a water supply pipe 37 and a water storage section 38. The water storage section 38 is disposed on the support 20 and forms a water storage cavity 381. One end of the water supply pipe 37 is connected to the second opening 323, and the other end is connected to the water storage cavity 381.

[0043] In practical applications, by setting up a water supply pipe 37 and a water storage section 38, the water supply pipe 37 can precisely control the drainage position of the gas collection chamber 321, so that the water can be collected by the water storage section 38, thereby facilitating the cleaning and treatment of the water discharged from the gas collection chamber 321 by the testing personnel.

[0044] In one embodiment, reference is made to Figure 3 The gas collecting part 32 has a third opening 324 that communicates with the gas collecting cavity 321. The third opening 324 and the second opening 323 are respectively disposed at opposite ends of the gas collecting part 32.

[0045] The acquisition component 30 includes a third valve 39, which is disposed in the gas collection section 32 to control the opening and closing of the third opening 324.

[0046] In practical applications, the third opening 324 remains closed after the needle 31 is inserted into the battery under test. After the volume measurement is completed, the tester can conveniently collect the gas released by the battery under test through the third opening 324, thereby facilitating subsequent analysis of the gas composition or properties and improving the practicality and operational efficiency of the testing device. It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0047] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0048] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0049] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A detection device, characterized in that, include: The support is used to hold the battery under test. The data collection component includes a needle, a gas collection section, a first valve, and a second valve. The needle is slidably disposed on the support and has a through hole. The needle is used to insert into the battery under test. The gas collection section forms a gas collection chamber and a first opening and a second opening communicating with the gas collection chamber. The gas collection chamber is connected to the through hole through the first opening. The first valve is disposed on the gas collection section to control the opening and closing of the first opening, and the second valve is disposed on the gas collection section to control the opening and closing of the second opening.

2. The detection device according to claim 1, characterized in that, The support has a positioning groove for placing the battery, and the needle is slidably disposed on the support in a direction that is close to or away from the positioning groove.

3. The detection device according to claim 2, characterized in that, The support includes a base and a limiting part. The base has the positioning groove. The limiting part is disposed on the base. The limiting part and the base enclose a placement cavity. The placement cavity is connected to the positioning groove. An insertion port is provided at the end of the placement cavity away from the positioning groove. The needle is slidably disposed on the base in a direction close to or away from the placement cavity.

4. The detection device according to claim 1, characterized in that, The detection device includes a drive assembly, which includes a drive rod threadedly connected to the support, and the needle is disposed on the drive rod.

5. The detection device according to claim 4, characterized in that, The driving assembly includes a slider, the support includes a base and a guide portion, the guide portion is disposed on the base, the slider is rotatably disposed on the driving rod and slidably disposed on the guide portion, and the needle is disposed on the slider.

6. The detection device according to claim 5, characterized in that, The collection component includes an air supply pipe, one end of which is disposed on the slider and the other end is connected to the air collection part. The through hole and the first opening are connected through the air supply pipe, and the air supply pipe is used to support the air collection part.

7. The detection device according to any one of claims 1 to 6, characterized in that, The acquisition component includes a sealing part that covers the outer peripheral surface of the needle. When the needle is inserted into the battery under test, the sealing part is used to seal the gap between the needle and the battery under test.

8. The detection device according to claim 7, characterized in that, In the direction of extension of the needle, towards the direction of the first opening, the diameter of the sealing portion gradually increases.

9. The detection device according to any one of claims 1 to 6, characterized in that, The acquisition component includes a water supply pipe and a water storage section. The water storage section is disposed on the support and forms a water storage cavity. One end of the water supply pipe is connected to the second opening, and the other end is connected to the water storage cavity.

10. The detection device according to any one of claims 1 to 6, characterized in that, The gas collecting section has a third opening that communicates with the gas collecting cavity, and the third opening and the second opening are respectively located at opposite ends of the gas collecting section; The collection component includes a third valve, which is disposed in the gas collection section to control the opening and closing of the third opening.

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