Battery pole structure, battery case, and battery

Abstract

This utility model relates to the field of batteries, providing a battery terminal structure, a casing, and a battery. The battery terminal structure includes a terminal body with a flow groove formed on the side of the terminal body facing the upper plastic layer. The flow groove is recessed along the thickness direction of the terminal body and extends radially along the terminal body. This battery terminal structure, by providing a flow groove on the terminal body, establishes a fluid pathway connecting the inside and outside of the battery for helium gas detection in the event of a missing seal. Helium gas can enter the battery through the flow groove. If a battery has a missing seal, the helium gas diffuses through the flow groove in a timely manner. Using specialized helium gas detection equipment, the helium gas inside the battery can be accurately detected, thereby identifying defective batteries with missing seals, improving detection accuracy, and effectively preventing defective products from entering subsequent production stages.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a battery terminal structure, casing and battery. Background Technology

[0002] In the production of cylindrical batteries, the installation of the sealing ring is one of the key steps to ensure battery safety. However, in actual manufacturing processes, there is a risk of missing sealing rings, which directly threatens the battery's sealing performance. Currently, some cylindrical batteries use upper and lower plastic encapsulation for the positive electrode structure. The upper plastic typically uses PPS material, which has good compressibility. During the riveting process, this material undergoes some deformation, thus providing a certain degree of sealing performance. However, even with this degree of sealing, it is still insufficient to completely prevent helium leakage. Because cylindrical batteries undergo electrolyte injection and formation gas generation processes in subsequent production steps, these operations may cause pressure changes or minor deformations within the casing, further leading to seal failure and battery leakage. This not only results in a decline in production quality and battery safety performance but may also produce batch-to-batch instability and defective products, seriously affecting the reliability and safety of the battery.

[0003] To address this issue, existing helium testing equipment struggles to effectively screen for defective products caused by missing sealing rings. Current testing methods cannot identify these non-standard assembled batteries on the production line, posing a challenge to quality control in subsequent manufacturing stages. Missing sealing rings, undetected during manufacturing, make these batteries more prone to electrolyte leakage when subjected to vibration or internal chemical reactions during production and transportation. This not only damages battery safety and lifespan but may also lead to environmental and safety incidents. Utility Model Content

[0004] This utility model provides a battery terminal structure to solve the defect in related technologies where missing seals cannot be detected.

[0005] This utility model embodiment also provides a housing.

[0006] This utility model embodiment also provides a battery.

[0007] The first aspect of this utility model provides a battery terminal structure, including a terminal body, a flow groove formed on the side of the terminal body facing the upper plastic, the flow groove being recessed along the thickness direction of the terminal body and extending along the radial direction of the terminal body.

[0008] According to one embodiment of the present invention, the width of the flow groove along the radial direction of the pole body ranges from 1 mm to 1.8 mm.

[0009] According to one embodiment of the present invention, the depth of the flow groove along the thickness direction of the electrode body ranges from 0.1 mm to 0.2 mm.

[0010] According to one embodiment of the present invention, the distance between the inner edge of the flow groove and the sealing element is greater than or equal to 0.1 mm along the radial direction of the pole body.

[0011] According to one embodiment of the present invention, at least two flow grooves are formed at intervals on the electrode body along the circumferential direction of the electrode body, and the outer edge of the flow groove is connected to the outer edge of the electrode body.

[0012] According to one embodiment of the present invention, the pole body includes:

[0013] A crimping section is crimped onto the upper plastic, and a flow groove is formed on the side of the crimping section facing the upper plastic;

[0014] A connecting section is attached to the side of the crimping section facing the upper plastic.

[0015] According to one embodiment of the present invention, the crimping section has a crimping portion and a receiving portion on the side facing the upper plastic, the flow groove is formed on the side of the crimping portion facing the upper plastic, and the receiving portion is used to snap the sealing element.

[0016] According to one embodiment of the present invention, the length of the flow groove is less than or equal to the length of the crimping portion along the radial direction of the crimping portion.

[0017] A second aspect of this utility model provides a housing, including the battery terminal structure as described above.

[0018] A third aspect of this utility model provides a battery, including the battery terminal structure as described above;

[0019] Or a casing as described above.

[0020] According to the battery terminal structure provided in the first aspect of this utility model, by setting a flow channel on the terminal body, a fluid passage connecting the inside and outside of the battery is established for helium gas detection in the event of a missing seal. Helium gas can enter the battery through the flow channel. If the battery has a missing seal, the helium gas diffuses through the flow channel in time. At this time, using professional helium gas detection equipment, the helium gas inside the battery can be accurately detected, thereby identifying defective batteries with missing seals, greatly improving the accuracy of detection, and effectively preventing defective products from entering subsequent production stages. It facilitates the timely detection and correction of assembly problems in the production process, optimizes the production quality control process, reduces the defect rate, and improves the overall production quality. Helium gas detection through the flow channel eliminates batteries with missing seals in advance, ensuring the sealing performance of the battery from the source, effectively preventing electrolyte leakage, improving battery safety performance, and reducing the risk of use.

[0021] According to the second aspect of the present invention, the housing contains the aforementioned battery terminal structure with a flow groove. During helium testing of the battery, even if a seal is missing, helium can still establish a fluid path between the inside and outside of the battery through the flow groove on the terminal. This makes the detection of missing seals on the housing and the internal battery more efficient and accurate. This helps to promptly identify and eliminate products with potential sealing problems during the production process, improving product quality and production efficiency.

[0022] According to the battery provided in the third aspect of this utility model, whether it adopts a terminal structure with a flow groove or a casing containing such a terminal structure, it can efficiently detect missing seals during battery production. Helium gas detection can quickly and accurately identify batteries with missing seals, preventing such defective products from entering the market. Compared to traditional detection methods, this significantly improves detection accuracy and efficiency, reduces product quality problems caused by missed detections, and enhances the overall quality of the product. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic perspective view of the battery provided by this utility model.

[0025] Figure 2 This is a schematic top view of the battery provided by this utility model.

[0026] Figure 3 yes Figure 2 A schematic cross-sectional view along the AA direction.

[0027] Figure 4 yes Figure 3 A magnified view of a section at point B.

[0028] Figure 5 This is a schematic top view of the pole body provided by this utility model.

[0029] Figure label:

[0030] 100. Pole post body; 102. Upper plastic; 104. Flow groove; 106. Seal; 108. Crimping section; 110. Connecting section; 112. Crimping part; 114. Receiving part; 116. Housing. Detailed Implementation

[0031] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0032] like Figures 1 to 5 As shown, the first aspect of this utility model provides a battery terminal structure, including a terminal body 100. A flow groove 104 is formed on the side of the terminal body 100 facing the upper plastic 102. The flow groove 104 is recessed along the thickness direction of the terminal body 100 and extends along the radial direction of the terminal body 100. In the case of missing sealing member 106, the flow groove 104 is adapted to establish a fluid passage for helium detection between the inside and outside of the battery.

[0033] According to the battery terminal structure provided in the first aspect of this utility model, by setting a flow channel 104 on the terminal body 100, a fluid passage connecting the inside and outside of the battery is established for helium gas detection in the case of a missing seal 106. Helium gas can enter the battery through the flow channel 104. If the battery has a missing seal 106, the helium gas diffuses through the flow channel 104 in time. At this time, using professional helium gas detection equipment, the helium gas inside the battery can be accurately detected, thereby identifying defective batteries with missing seals 106, greatly improving the accuracy of detection, and effectively preventing defective products from flowing into subsequent production stages. It facilitates timely detection and correction of assembly problems in the production process, optimizes the production quality control process, reduces the defect rate, and improves the overall production quality. Helium gas detection through the flow channel 104 eliminates batteries with missing seals 106 in advance, ensuring the sealing performance of the battery from the source, effectively preventing electrolyte leakage, improving battery safety performance, and reducing usage risks.

[0034] Please continue reading Figures 1 to 5The electrode body 100 needs to possess good conductivity, corrosion resistance, and a certain degree of mechanical strength. Metals such as copper and aluminum are typically chosen. Taking lithium-ion batteries as an example, if copper is used as the electrode body 100 material, its high conductivity can effectively reduce the battery's internal resistance and improve charging and discharging efficiency; while aluminum has the advantages of being lightweight and low-cost, making it suitable for applications where weight and cost are critical. After determining the material, appropriate surface treatments, such as nickel plating or chromium plating, are required to enhance its corrosion resistance and prevent corrosion by electrolytes during battery use.

[0035] A flow groove 104 is formed on the side of the electrode body 100 facing the upper plastic 102, and various processes can be used. For flow grooves 104 with high precision requirements and complex shapes, CNC milling can be used. Through precise programming control, the dimensional accuracy and surface quality of the flow groove 104 can be guaranteed. If the flow groove 104 is small in size and mass-produced, etching can be used. Etching uses a chemical solution to corrode the surface of the electrode body 100, which can produce tiny and uniform flow grooves 104. In addition, laser engraving and other processes can also be used, which have the characteristics of fast processing speed and high precision.

[0036] According to one embodiment of the present invention, the width of the flow groove 104 along the radial direction of the pole body 100 ranges from 1 mm to 1.8 mm.

[0037] In one embodiment of this invention, the width of the flow channel 104 can be ensured to meet this standard through precise mold design and manufacturing processes. For example, during mold processing, high-precision CNC machining equipment is used to precisely cut the width of the flow channel 104, ensuring that the error is controlled within a very small range.

[0038] This width design ensures sufficient space for helium to flow smoothly through the flow channel 104 during helium gas detection of the missing seal 106, establishing an effective fluid pathway between the inside and outside of the battery. If the width is too narrow, it may obstruct helium flow, affecting the accuracy of the detection results and preventing the battery with the missing seal 106 from being effectively detected. The width range of 1 mm to 1.8 mm significantly improves the reliability and stability of the detection.

[0039] According to one embodiment of the present invention, the depth of the flow groove 104 along the thickness direction of the pole body 100 ranges from 0.1 mm to 0.2 mm.

[0040] In one embodiment of this utility model, when manufacturing the electrode body 100, this depth requirement can be achieved using advanced stamping or etching processes. For example, when using a stamping process, the pressure and stroke of the stamping die are precisely adjusted according to different electrode materials and thicknesses to ensure that the depth of the flow groove 104 is within the specified range; if an etching process is used, parameters such as the concentration of the etching solution, etching time, and temperature are strictly controlled to achieve a precise etching depth.

[0041] This depth design ensures the structural strength of the electrode body 100 while providing a suitable flow channel for helium gas detection. If the depth is too shallow, helium gas will have difficulty passing smoothly through the flow channel 104, making effective detection impossible; if the depth is too deep, it may weaken the structural strength of the electrode body 100, affecting the overall performance of the battery. The depth range of 0.1-0.2 mm strikes a perfect balance between detection requirements and structural strength requirements, ensuring both the accuracy of the detection and the reliability of the electrode during battery use.

[0042] According to one embodiment of the present invention, the distance between the inner edge of the flow groove 104 and the seal 106 along the radial direction of the pole body 100 is greater than or equal to 0.1 mm.

[0043] In one embodiment of this utility model, this spacing is ensured by optimizing the mold structure and assembly process during the design and manufacturing of the pole body 100. For example, in the mold design stage, the relative positional relationship between the installation position of the seal 106 and the flow groove 104 is accurately calculated and designed; in the assembly stage, a high-precision positioning fixture is used to ensure that the seal 106 is accurately installed in the receiving part 114, thereby ensuring that the spacing between the inner edge of the flow groove 104 and the seal 106 meets the standard.

[0044] This spacing effectively prevents the seal 106 from squeezing or blocking the flow channel 104 after installation, ensuring that the flow channel 104 is not affected when the seal 106 is properly installed. When helium testing is performed with the seal 106 missing, it ensures that helium can flow smoothly in the flow channel 104, avoiding the impact on the accuracy of helium testing due to installation deviation of the seal 106 caused by excessively small spacing, thus improving the reliability of the test results.

[0045] According to one embodiment of the present invention, at least two flow grooves 104 are formed at intervals on the pole body 100 along the circumferential direction of the pole body 100, and the outer edge of the flow groove 104 is connected to the outer edge of the pole body 100.

[0046] In one embodiment of this utility model, the manufacturing process of the electrode body 100 is achieved through a special mold design and processing technology. For example, multiple corresponding protrusion structures are set on the mold, and multiple spaced flow grooves 104 are formed at one time when the electrode body 100 is stamped or cast; and during the processing, the connection accuracy between the outer edge of the flow groove 104 and the outer edge of the electrode body 100 is ensured, so that helium can enter and exit smoothly.

[0047] Multiple spaced flow channels 104 with their outer edges extending through each other increase the flow path of helium gas, greatly improving the sensitivity of helium gas detection. Compared to a single flow channel 104, multiple flow channels 104 can more comprehensively detect whether there is a missing seal 106 inside the battery. Even if some flow channels 104 are affected by impurities or other factors, effective detection can still be performed through other flow channels 104, reducing the possibility of missed detections and improving detection efficiency and accuracy.

[0048] According to one embodiment of the present invention, the pole body 100 includes:

[0049] A crimping section 108 is crimped onto the upper plastic 102, and a flow groove 104 is formed on the side of the crimping section 108 facing the upper plastic 102.

[0050] The connecting section 110 is connected to the side of the crimping section 108 facing the upper plastic 102.

[0051] In one embodiment of this utility model, for the crimping section 108, a flow groove 104 is manufactured on the side that contacts the upper plastic 102 using machining or molding processes. For example, the shape and size of the flow groove 104 are precisely milled according to design requirements using a machine milling process; for the connecting section 110, a suitable shape and structure are designed according to the connection requirements inside the battery to ensure good connection with other components inside the battery.

[0052] This structural design allows the terminal body 100 to achieve a stable connection with the upper plastic 102 while also providing the necessary flow channel 104 structure for helium gas detection. The pressing method between the pressing section 108 and the upper plastic 102 ensures the sealing and stability between the terminal and the upper plastic 102, preventing loosening or leakage during battery use. The connecting section 110 facilitates the connection between the terminal and other internal components of the battery, ensuring the electrical connection and structural integrity of the battery. Simultaneously, the flow channel 104, located on the pressing section 108, facilitates helium gas detection even when the seal 106 is missing, improving the quality control level during battery production.

[0053] According to one embodiment of the present invention, a crimping portion 112 and a receiving portion 114 are formed on the side of the crimping section 108 facing the upper plastic 102, and a flow groove 104 is formed on the side of the crimping portion 112 facing the upper plastic 102. The receiving portion 114 is used to snap the sealing member 106.

[0054] In one embodiment of this utility model, the crimping section 108 can be manufactured using high-precision molds and processing techniques to produce the crimping part 112, the receiving part 114, and the flow groove 104. For example, when manufacturing the crimping section 108 using an injection mold, corresponding core and cavity structures are set in the mold, and the shapes of the crimping part 112, the receiving part 114, and the flow groove 104 are manufactured in one step through the injection molding process. During the processing, the dimensional accuracy and surface roughness of each part are strictly controlled to ensure that the sealing element 106 can be tightly engaged in the receiving part 114, and that the shape and size of the flow groove 104 meet the design requirements.

[0055] The design of the crimping portion 112 enhances the connection strength between the crimping section 108 and the upper plastic 102, ensuring the battery's sealing performance. The receiving portion 114 provides an accurate installation position for the seal 106, ensuring that the seal 106 can effectively perform its sealing function. The flow channel 104, located on the crimping portion 112, provides a stable fluid path for helium gas detection in the event of a missing seal 106. This structural design rationally combines sealing and detection functions, meeting the sealing requirements during normal battery use while facilitating the detection of missing seals 106 during production, thus improving battery production quality and safety.

[0056] According to one embodiment of the present invention, the length of the flow groove 104 is less than or equal to the length of the crimping portion 112 in the radial direction of the crimping portion 112.

[0057] In one embodiment of this utility model, when forming the flow groove 104, the length of the flow groove 104 is controlled by a suitable processing technology according to the size and design requirements of the pressing part 112. For example, when using laser cutting, the length of the flow groove 104 is ensured to meet the requirements by precisely setting the laser power, cutting speed and cutting path; if using machining, the length of the flow groove 104 is precisely controlled by adjusting the tool stroke and cutting parameters.

[0058] The design that the length of the flow channel 104 is less than or equal to the length of the crimping portion 112 ensures that the flow channel 104 will not be too long and affect the crimping effect when the crimping section 108 is crimped with the upper plastic 102, thus preventing a decrease in sealing performance. Simultaneously, this design also ensures that when helium testing is performed on the missing seal 106, the flow channel 104 can effectively establish a fluid passage between the inside and outside of the battery, meeting the testing requirements without affecting the connection performance between the terminal body 100 and the upper plastic 102, thus guaranteeing the overall quality and safety of the battery.

[0059] A second aspect of this utility model provides a housing 116, including the battery terminal structure as described above.

[0060] According to the housing 116 provided in the second aspect embodiment of this utility model, since the housing 116 contains the aforementioned battery terminal structure with a flow groove 104, when performing helium gas testing on the battery, even if the seal 106 is missing, helium can still establish a fluid path between the inside and outside of the battery through the flow groove 104 on the terminal. This makes the detection of missing seals 106 on the housing 116 and the internal battery more efficient and accurate. This helps to promptly identify and eliminate products with potential sealing problems during the production process, improving product quality and production efficiency.

[0061] A third aspect of this utility model provides a battery, including the battery terminal structure as described above;

[0062] Or, as described above, housing 116.

[0063] When the battery adopts the aforementioned battery terminal structure, the terminal structure is accurately installed into the corresponding position on the battery during battery assembly. The crimping section 108 of the terminal body 100 is tightly crimped to the upper plastic 102 of the battery. Through specific crimping processes, such as hot pressing or cold pressing, the connection between the two is ensured to be firm and well-sealed. The connecting section 110 makes a reliable electrical connection to the electrodes and other components inside the battery. The connection method can be welding, riveting, etc., to ensure stable current transmission inside the battery. At the same time, the flow groove 104 on the terminal body 100 is not damaged during installation and its integrity is maintained so that it can normally function to establish a helium detection fluid passage when the sealing element 106 is missing.

[0064] When the battery uses the aforementioned casing 116, during the battery assembly stage, the internal components of the battery, such as electrodes, electrolyte, and separator, are sequentially installed into the casing 116 according to a predetermined process flow. During this process, it is ensured that the terminal post structure within the casing 116 precisely matches the internal components, especially ensuring a tight connection between the terminal post connection section 110 and the electrode to avoid problems such as loose connections or short circuits. Simultaneously, to ensure the overall sealing of the battery, in addition to relying on the sealing element 106, the integrated design of the terminal post structure and the casing 116 also provides additional protection for the battery's sealing.

[0065] According to the battery provided in the third aspect embodiment of this utility model, whether it adopts an electrode structure with a flow groove 104 or a housing 116 including the electrode structure, it can efficiently detect the situation of missing seal 106 during battery production. Through helium gas detection, batteries with missing seal 106 can be quickly and accurately identified, preventing such defective products from entering the market. Compared with traditional detection methods, this greatly improves detection accuracy and efficiency, reduces product quality problems caused by missed detections, and enhances the overall quality of the product.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery terminal structure, characterized in that, Includes an electrode body, on which a flow groove is formed on the side of the electrode body facing the upper plastic, the flow groove being recessed along the thickness direction of the electrode body and extending along the radial direction of the electrode body.

2. The battery terminal structure according to claim 1, characterized in that, Along the radial direction of the pole body, the width of the flow groove ranges from 1 mm to 1.8 mm.

3. The battery terminal structure according to claim 1, characterized in that, Along the thickness direction of the electrode body, the depth of the flow groove ranges from 0.1 mm to 0.2 mm.

4. The battery terminal structure according to claim 1, characterized in that, Along the radial direction of the pole body, the distance between the inner edge of the flow groove and the seal is greater than or equal to 0.1 mm.

5. The battery terminal structure according to claim 1, characterized in that, Along the circumferential direction of the electrode body, at least two flow grooves are formed at intervals on the electrode body, and the outer edge of the flow groove is connected to the outer edge of the electrode body.

6. The battery terminal structure according to claim 4, characterized in that, The pole body includes: A crimping section is crimped onto the upper plastic, and a flow groove is formed on the side of the crimping section facing the upper plastic; A connecting section is attached to the side of the crimping section facing the upper plastic.

7. The battery terminal structure according to claim 6, characterized in that, The crimping section has a crimping portion and a receiving portion on the side facing the upper plastic. The flow groove is formed on the side of the crimping portion facing the upper plastic. The receiving portion is used to snap the seal.

8. The battery terminal structure according to claim 7, characterized in that, Along the radial direction of the crimping portion, the length of the flow groove is less than or equal to the length of the crimping portion.

9. A housing, characterized in that, Includes the battery terminal structure as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the battery terminal structure as described in any one of claims 1 to 8; Or the housing as described in claim 9.

Images