Upper plastic, electrode structure and battery

Abstract

The utility model relates to the field of batteries, and provides upper plastic, an electrode structure and a battery. The upper plastic comprises an upper plastic body, a conduction groove is formed in the side, facing the shell, of the upper plastic body, the conduction groove is sunken in the thickness direction of the upper plastic and extends in the radial direction of the upper plastic body, and the conduction groove is suitable for establishing a fluid channel for helium detection between the interior of the battery and the exterior of the battery under the condition that the sealing element is neglected. Due to the arrangement of the conducting groove on the upper plastic, when helium detection is carried out, if a sealing element is neglected to be installed, helium can quickly pass through the conducting groove to circulate between the inside and the outside of the battery. Compared with a traditional detection mode, the method does not need a complex disassembly and reassembly process to check whether the sealing element is installed or not, greatly shortens the detection time, improves the detection efficiency and the detection accuracy, can timely discover the defective product with the neglected sealing element, and prevents the defective product from flowing into a subsequent production link.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides an upper plastic layer, an electrode structure, and a battery. Background Technology

[0002] Currently, the positive electrode structure of a cylindrical battery mainly includes components such as an upper plastic layer, a battery casing, a sealing ring, a lower plastic layer, a riveting block, and a terminal post. These components are sealed by riveting.

[0003] However, the risk of missing sealing rings still exists during manufacturing. Since the top plastic is typically made of PPS (polyphenylene sulfide), this material undergoes some deformation even during riveting, thus reducing some sealing performance. Even with helium gas testing in subsequent production, if a missing sealing ring is found, the battery itself still retains a certain level of sealing capability. Therefore, helium testing may not accurately detect the problem, leading to defective products entering the production line. Utility Model Content

[0004] This utility model provides an upper plastic coating to solve the defect in related technologies where ineffective detection is impossible after a seal is missing.

[0005] This utility model embodiment also provides an electrode structure.

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

[0007] A first aspect of this utility model provides an upper plastic body, including an upper plastic body, on the side of the upper plastic body facing the housing, a through groove is formed, the through groove is recessed along the thickness direction of the upper plastic body and extends along the radial direction of the upper plastic body, and in the case of a missing seal, the through groove is adapted to establish a fluid passage for helium detection between the inside and outside of the battery.

[0008] According to one embodiment of the present invention, the width of the guide groove is greater than or equal to 1 mm along the radial direction of the upper plastic body.

[0009] According to one embodiment of the present invention, the depth of the guide groove is in the range of 0.1 mm to 0.6 mm along the thickness direction of the upper plastic body.

[0010] According to one embodiment of the present invention, the gap between the bottom of the guide groove and the housing is less than 0.6 mm.

[0011] According to one embodiment of the present invention, at least two of the guide grooves are formed at intervals on the upper plastic body along the circumferential direction of the upper plastic body.

[0012] According to one embodiment of the present invention, at least three through grooves are formed at intervals on the upper plastic body along the circumferential direction, and the spacing between two adjacent through grooves is equal.

[0013] According to one embodiment of the present invention, the upper plastic body includes:

[0014] An annular portion is disposed between the pole post and the housing, and the conductive groove is formed on the side of the annular portion facing the housing;

[0015] The boss portion is integrally formed with the annular portion and is located on the outer edge of the annular portion.

[0016] According to one embodiment of the present invention, the housing has a press-fit portion and a protrusion that are connected to each other. The press-fit portion is located between the upper plastic body and the lower plastic body. A gap is formed between the edge of the protrusion and the edge of the upper plastic body. The gap is in communication with the fluid passage.

[0017] A second aspect of this utility model provides an electrode structure, including an electrode post and an upper plastic as described above.

[0018] A third aspect of this utility model provides a battery, comprising the upper plastic as described above;

[0019] Or an electrode structure as described above.

[0020] According to the first aspect of the present invention, the conductive groove in the upper plastic casing allows helium gas to quickly flow between the inside and outside of the battery if a missing seal is found during helium gas testing. Compared to traditional testing methods, this eliminates the need for complex disassembly and reassembly to check for seal installation, significantly shortening testing time and improving efficiency. Simultaneously, helium gas more directly reflects the internal sealing condition of the battery, reducing testing errors and improving accuracy. This allows for the timely detection of defective products with missing seals, preventing them from entering subsequent production stages. By utilizing the conductive groove for helium gas testing, batteries with missing seals can be quickly and accurately screened on the production line, reducing product rework and scrap rates due to sealing issues. Traditional testing methods may require more manpower and time to investigate sealing problems, while the conductive groove design automates and increases efficiency, reducing labor costs and production losses, thereby lowering overall production costs. Timely detection of missing seals ensures that the battery's sealing performance meets requirements. A well-sealed battery can effectively prevent electrolyte leakage and the entry of external moisture and impurities into the battery, thereby improving battery life and safety.

[0021] According to the electrode structure provided in the second aspect of this utility model, the proper cooperation between the electrode post and the upper plastic ensures good conductivity of the electrode structure. The electrode post can effectively conduct electrical energy from inside the battery to the external circuit, reducing losses during power transmission. Simultaneously, the upper plastic, as an insulating component, prevents short circuits between the electrode post and the battery casing, improving the electrical safety and stability of the battery. The presence of the plastic provides good sealing performance between the electrode structure and the battery casing. Under normal circumstances, the sealant, in conjunction with the upper plastic, prevents electrolyte leakage and the entry of external impurities into the battery. The design of the conductive groove facilitates helium gas detection, enabling quick and accurate detection of problems when a sealant is missing, thus improving product quality control. By promptly identifying sealing problems, battery performance degradation and safety hazards caused by poor sealing can be avoided, extending the battery's lifespan.

[0022] According to the battery provided in the third aspect of this utility model, regardless of whether it includes an upper plastic layer or an electrode structure, the presence of a conductive groove greatly improves the reliability of battery quality testing. In the helium gas testing process, if a seal is missing, the conductive groove can quickly establish a fluid pathway between the inside and outside of the battery, allowing the testing equipment to quickly detect the anomaly, preventing substandard batteries from entering the market, and reducing after-sales risks and costs. From a performance assurance perspective: the rational application of the upper plastic layer and electrode structure ensures the battery's sealing and insulation. During normal assembly, the seal and upper plastic layer work together to prevent electrolyte leakage and the intrusion of external impurities, stabilizing the internal chemical environment of the battery and maintaining stable battery performance. The cooperation between the terminals and the upper plastic layer ensures smooth energy output from the battery, improving the battery's charge / discharge performance and lifespan. From a production efficiency perspective: the modular design concept, whether the upper plastic layer is installed separately or the electrode structure is assembled as a whole, simplifies the battery production process, facilitates automated production, improves production efficiency, reduces errors that may be caused by manual operation, and ensures consistent product quality. 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 label:

[0029] 100. Upper plastic body; 102. Housing; 104. Conductor groove; 106. Seal; 108. Annular part; 110. Boss part; 112. Press-fit part; 114. Protrusion part; 115. Lower plastic; 116. Terminal post. Detailed Implementation

[0030] 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.

[0031] like Figures 1 to 4 As shown, the first aspect of this utility model provides an upper plastic, including an upper plastic body 100, and a through groove 104 formed on the side of the upper plastic body 100 facing the housing 102. The through groove 104 is recessed along the thickness direction of the upper plastic and extends along the radial direction of the upper plastic body 100. In the case of a missing seal 106, the through groove 104 is adapted to establish a fluid passage for helium detection between the inside and outside of the battery.

[0032] According to the first aspect of the present invention, the conductive groove 104 allows helium gas to quickly flow between the inside and outside of the battery if a missing seal 106 is found during helium gas testing. Compared to traditional testing methods, this eliminates the need for complex disassembly and reassembly to check for the seal 106, significantly shortening testing time and improving efficiency. Simultaneously, helium gas more directly reflects the sealing condition inside the battery, reducing testing errors and improving accuracy. This allows for the timely detection of defective products with missing seals 106, preventing them from entering subsequent production stages. By utilizing the conductive groove 104 for helium gas testing, batteries with missing seals 106 can be quickly and accurately screened on the production line, reducing product rework and scrap rates due to sealing issues. Traditional testing methods may require more manpower and time to investigate sealing problems, while the design of the conductive groove 104 automates and increases efficiency, reducing labor costs and production losses, thereby lowering overall production costs. Timely detection of the missing seal 106 ensures that the battery's sealing performance meets requirements. A well-sealed battery effectively prevents electrolyte leakage and the entry of external moisture and impurities, thereby improving battery life and safety.

[0033] Please continue reading Figures 1 to 4 The upper plastic provided in the first aspect of this utility model has a guide groove 104 provided on the side of the upper plastic body 100 facing the housing 102 during the design of the upper plastic body 100. The upper plastic is manufactured using an injection mold. During the mold manufacturing stage, high-precision processing equipment, such as a CNC machining center, is used to accurately machine the portion of the mold corresponding to the guide groove 104, ensuring the dimensional accuracy of the guide groove 104. During the injection molding process, parameters such as the temperature, pressure, and injection speed of the plastic are strictly controlled. For example, based on the characteristics of the plastic, the temperature is controlled within a suitable range to ensure good fluidity of the plastic, enabling it to accurately fill the guide groove 104 in the mold, thereby ensuring that the guide groove 104 is precisely recessed along the thickness direction of the upper plastic and extends straight along the radial direction of the upper plastic body 100.

[0034] Under normal assembly conditions, the seal 106 is installed in a specific position to seal and prevent helium from flowing through the conductive groove 104. However, when the seal 106 is missing, the conductive groove 104 becomes a channel between the inside and outside of the battery. During assembly, the upper plastic is assembled with other battery components such as the terminals 116 and the casing 102. It is necessary to ensure that the upper plastic is installed in an accurate position to ensure that the conductive groove 104 can function properly. By designing a reasonable positioning structure and assembly process, such as setting positioning pins and positioning holes on the upper plastic and the casing 102, it is ensured that the upper plastic can accurately fit with the casing 102 during assembly, so that the conductive groove 104 can effectively establish a fluid passage when the seal 106 is missing.

[0035] According to one embodiment of the present invention, the width of the guide groove 104 is greater than or equal to 1 mm along the radial direction of the upper plastic body 100.

[0036] In one embodiment of this utility model, when designing the upper plastic body, the width of the guide groove 104 along the radial direction of the upper plastic body 100 is precisely set to ensure that its width is not less than 1 mm. In actual production, through precise mold manufacturing and strict control of the injection molding process, the width of the guide groove 104 is guaranteed to meet this standard. In the mold manufacturing stage, high-precision processing equipment is used to control the dimensional accuracy of the corresponding guide groove 104 width within a very small tolerance range. During the injection molding process, parameters such as plastic flowability, injection pressure, and temperature are strictly monitored to avoid deviations in the width of the guide groove 104 due to process issues.

[0037] This width design ensures sufficient space for helium to flow smoothly through the conductive groove 104 during helium gas detection of the missing seal 106, forming an effective fluid passage between the inside and outside of the battery. If the width of the conductive groove 104 is too small, the helium may encounter significant resistance during flow, leading to reduced detection sensitivity and inaccurate detection of the presence of a missing seal 106. A width greater than or equal to 1 mm ensures smooth helium flow, improving the accuracy and reliability of detection and effectively preventing defective products from entering the production line due to the undetected missing seal 106.

[0038] According to one embodiment of the present invention, the depth of the guide groove 104 along the thickness direction of the upper plastic body 100 ranges from 0.1 mm to 0.6 mm.

[0039] In one embodiment of this invention, the depth of the guide groove 104 is precisely controlled by optimizing the mold structure and injection molding process parameters. During mold design, the core size and shape are rationally designed according to the depth requirements of the guide groove 104. During the injection molding stage, parameters such as the injection stroke, holding time, and pressure of the injection molding machine are precisely controlled. For example, regarding the injection stroke, the injection stroke is fine-tuned based on the characteristics of different batches of plastic raw materials and the actual condition of the mold to ensure that the plastic fills the guide groove 104 to a depth within the range of 0.1 to 0.6 mm. Adjustments to the holding time and pressure are made to prevent changes in the depth of the guide groove 104 during the cooling and shrinkage process of the plastic.

[0040] If the depth of the conductive groove 104 is less than 0.1 mm, it may not be able to effectively connect with the inside and outside of the battery, making it difficult for helium to pass through for detection. If the depth of the conductive groove 104 is greater than 0.6 mm, it may affect the structural strength of the upper plastic body 100, causing problems when the upper plastic is used with other components. For example, during the assembly of the upper plastic with the terminal post 116 and the casing 102, an excessively deep conductive groove 104 may cause the upper plastic to crack or deform, affecting the sealing performance and safety of the entire battery. Therefore, a depth range of 0.1 to 0.6 mm ensures that the fluid passage for helium detection is established normally while maintaining the structural integrity of the upper plastic body 100.

[0041] According to one embodiment of the present invention, the gap between the bottom of the guide groove 104 and the housing 102 is less than 0.6 mm.

[0042] In one embodiment of this utility model, during the mold manufacturing process, the dimensions of the bottom of the guide groove 104 and the corresponding portion of the housing 102 in the mold are machined with high precision, and the dimensional tolerances between them are strictly controlled. Simultaneously, after injection molding, the product is sampled and inspected using high-precision measuring instruments, such as a coordinate measuring machine, to ensure that the gap between the bottom of the guide groove 104 and the housing 102 meets the requirement of being less than 0.6 mm. If the gap is found to be non-compliant, the mold is adjusted or the injection molding process is improved in a timely manner. For example, by fine-tuning the mold closing accuracy, the deformation of the mold during the injection molding process is reduced, thereby controlling the gap size.

[0043] The gap of less than 0.6 mm ensures that helium can smoothly enter the battery from the conductive groove 104 through the gap, forming a complete fluid passage and improving the accuracy of helium detection, even when the seal 106 is missing. If the gap is too large, the seal 106 will not be able to effectively fill the gap when it is properly assembled, reducing the battery's sealing performance and increasing the risk of leakage. Conversely, a gap that is too small and within a reasonable range ensures the sealing effect of the seal 106 during normal assembly, while not affecting the formation of the helium detection fluid passage when the seal 106 is missing.

[0044] According to one embodiment of the present invention, at least two through grooves 104 are formed at intervals on the upper plastic body 100 along the circumferential direction of the upper plastic body 100.

[0045] In one embodiment of this invention, guide grooves 104 are formed during injection molding by providing corresponding protrusions on the surface of the mold cavity. During mold manufacturing, precision machining equipment is used to ensure the positional and dimensional accuracy of the protrusions, ensuring that the position and spacing of each guide groove 104 meet design requirements. During injection molding, injection parameters, such as plastic flow rate and pressure distribution, are controlled to ensure consistent molding quality for each guide groove 104.

[0046] The presence of at least two conductive slots 104 increases the flow path of helium between the inside and outside of the battery, improving the reliability of the detection. Compared to a single conductive slot 104, if one conductive slot 104 becomes blocked or experiences other abnormalities, the other conductive slots 104 can still ensure the normal operation of the fluid path for helium detection. Furthermore, multiple conductive slots 104 allow for a more even distribution of helium around the battery, enabling more comprehensive detection of any missing seals 106. This effectively prevents defective products with missing seals 106 from going undetected due to blind spots, improving the accuracy and comprehensiveness of product quality inspection.

[0047] According to one embodiment of the present invention, at least three through grooves 104 are formed at intervals on the upper plastic body 100 along the circumferential direction, and the spacing between two adjacent through grooves 104 is equal.

[0048] In one embodiment of this utility model, during the mold design stage, computer-aided design software can be used to accurately calculate the position of the guide groove 104 to ensure that the spacing between adjacent guide grooves 104 is equal.

[0049] During mold manufacturing, high-precision machining processes, such as electrical discharge machining (EDM) and wire cutting, are employed to ensure the positional accuracy of the guide grooves 104 on the mold. During injection molding, injection process parameters, such as plastic temperature, injection pressure, and speed, are strictly controlled to ensure uniform plastic flow within the mold cavity, guaranteeing consistent dimensions and shape for each guide groove 104. During production, the mold is regularly maintained and inspected to ensure that its precision does not decrease with prolonged use, thus maintaining the molding quality of the guide grooves 104.

[0050] The evenly distributed at least three conductive grooves 104 further optimize the helium detection effect. The equidistant design allows for more uniform helium flow around the battery, avoiding detection blind spots. From a detection principle perspective, multiple equidistant conductive grooves 104 can more comprehensively and evenly collect gas information inside the battery. Regardless of where the missing seal 106 occurs in the battery, helium can flow smoothly through the corresponding conductive groove 104, greatly improving the accuracy and reliability of the missing seal 106 detection and effectively reducing the probability of defective products entering the production line.

[0051] According to one embodiment of the present invention, the upper plastic body 100 includes:

[0052] An annular portion 108 is disposed between the pole post 116 and the housing 102, and a through groove 104 is formed on the side of the annular portion 108 facing the housing 102;

[0053] The boss portion 110 is integrally formed with the annular portion 108 and is formed on the outer edge of the annular portion 108.

[0054] In one embodiment of this utility model, during the injection molding process, the annular portion 108 and the boss portion 110 of the upper plastic body 100 are integrally molded using a set of molds. During mold design, the structural shape and dimensional relationship of the annular portion 108 and the boss portion 110 are rationally planned to ensure a smooth transition and a firm connection between them. The annular portion 108 is located between the pole post 116 and the housing 102, and its dimensions precisely match the mating dimensions of the pole post 116 and the housing 102. Precise mold manufacturing ensures that the inner and outer diameter tolerances of the annular portion 108 are within a very small range. The boss portion 110 is formed on the outer edge of the annular portion 108, and its height, width, and other dimensions are also carefully designed and rigorously manufactured to ensure the structural strength of the boss portion 110 and the accuracy of its fit with other components.

[0055] The annular portion 108 effectively separates the pole post 116 from the housing 102, serving both insulation and positioning purposes, while also providing a suitable location for the conductive groove 104. The boss portion 110 and the annular portion 108 are integrally formed, enhancing the overall structural strength of the upper plastic body 100 and making it less prone to deformation during assembly and use with other components. Furthermore, the gap formed between the boss portion 110 and the protrusion 114 on the housing 102, when the seal 106 is not installed, together with the conductive groove 104, constitutes a fluid passage, further improving the accuracy and reliability of helium detection. In addition, the integrally formed structure reduces the number of parts and assembly steps, improving production efficiency and reducing production costs.

[0056] According to one embodiment of the present invention, a press-fit portion 112 and a protrusion 114 are formed on the housing 102, which are connected to each other. The press-fit portion 112 is located between the upper plastic body 100 and the lower plastic body 115. A gap is formed between the edge of the protrusion 114 and the edge of the upper plastic body 100, and the gap is connected to the fluid passage.

[0057] In one embodiment of this utility model, during the manufacturing process of the housing 102, the press-fit portion 112 and the protrusion portion 114 can be formed by processes such as stamping and die casting. The size and shape of the press-fit portion 112 are designed to match the upper plastic body 100 and the lower plastic 115. During assembly, the press-fit portion 112 is pressed between the upper plastic body 100 and the lower plastic 115. A reserved gap is formed between the edge of the protrusion portion 114 facing the edge of the upper plastic body 100 and the edge of the upper plastic body 100. This gap is connected to the fluid passage mentioned above. When helium gas is detected due to the missing seal 106, helium gas can enter the gap through the conductive groove 104 and then diffuse to the outside of the battery. This increases the flow path of helium gas and the sensitivity of detection, improves the accuracy of detection, and effectively avoids the situation where the battery is not detected due to the missing seal 106, thus ensuring the quality and safety of the battery.

[0058] A second aspect of this utility model provides an electrode structure, including an electrode post 116 and an upper plastic as described above.

[0059] As a key conductive component of the electrode structure, the terminal 116 is typically made of a metal with good conductivity, such as copper or aluminum. In manufacturing the terminal 116, it is first pre-formed according to design requirements using casting or forging processes to ensure that it has suitable dimensions and basic structure. Then, precision machining equipment is used to further process the terminal 116, ensuring its surface flatness and dimensional accuracy to meet the requirements for mating with other components. One end of the terminal 116 connects to the electrode assembly inside the battery, enabling the conduction of electrical energy within the battery; the other end connects to an external circuit to output the battery's electrical energy.

[0060] When assembling the upper plastic and the terminal 116, it is essential to ensure a precise fit between the center hole of the upper plastic and the terminal 116. This requires strict control over the size and positional accuracy of the center hole during the manufacturing process of the upper plastic. During assembly, appropriate assembly techniques, such as interference fit or the use of sealant, should be employed to ensure a tight connection between the upper plastic and the terminal 116. Simultaneously, the position of the conductive groove 104 on the side of the upper plastic facing the housing 102 must match the relative position of the terminal 116 and the interior of the battery. This ensures that even if the seal 106 is not installed, the conductive groove 104 can smoothly establish a fluid path for helium detection between the inside and outside of the battery.

[0061] When installing the assembled electrode structure onto the battery casing 102, ensure that the terminal post 116 is correctly connected to the electrode assembly inside the battery, and that there is a good seal and positioning between the upper plastic and the casing 102. During installation, auxiliary tools and processes, such as locating pins and bolts, may be used to ensure the electrode structure is accurately positioned within the battery. Simultaneously, care must be taken to avoid damaging the conductive groove 104 of the upper plastic during installation, as this could affect the helium detection results.

[0062] Therefore, according to the electrode structure provided in the second aspect embodiment of this utility model, the proper cooperation between the electrode post 116 and the upper plastic ensures good conductivity of the electrode structure. The electrode post 116 can effectively conduct electrical energy inside the battery to the external circuit, reducing losses during the power transmission process. Simultaneously, the upper plastic, as an insulating component, can prevent short circuits between the electrode post 116 and the battery casing 102, improving the electrical safety and stability of the battery. The presence of the plastic provides good sealing performance between the electrode structure and the battery casing 102. Under normal circumstances, the seal 106 cooperates with the upper plastic to prevent electrolyte leakage and the entry of external impurities into the battery. The design of the conductive groove 104 facilitates helium gas detection, allowing for quick and accurate detection of problems when the seal 106 is missing, improving product quality control. By promptly detecting sealing problems, battery performance degradation and safety hazards caused by poor sealing can be avoided, extending the battery's lifespan.

[0063] A third aspect of this utility model provides a battery, comprising the upper plastic as described above;

[0064] Or an electrode structure as described above.

[0065] According to the battery provided in the third aspect embodiment of this utility model, when the battery includes the aforementioned upper plastic: in the overall structural design of the battery, the upper plastic is precisely installed in a specific position, with its annular portion 108 tightly fitted between the terminal post 116 and the housing 102, ensuring insulation and preliminary sealing between the terminal post 116 and the housing 102. On the battery assembly line, the upper plastic is accurately placed using positioning fixtures through automated or semi-automated equipment, and then subsequent connection processes with other components are performed. During installation, special care is taken to protect the conductive groove 104 to avoid deformation or blockage of the conductive groove 104 due to improper operation.

[0066] When the battery adopts the above-described electrode structure: the electrode structure, as a whole module, has already undergone high-precision assembly of the terminal post 116 and the upper plastic before entering the battery assembly stage. During battery assembly, the electrode structure is first precisely positioned within the battery housing 102 using specific positioning methods, such as positioning pins and slots, to ensure correct connection between the terminal post 116 and the internal electrode components of the battery. The electrode components include positive and negative plates, separators, etc., and the connection methods are mostly welding or riveting to ensure good conductivity. The protrusion 110 on the upper plastic is precisely aligned with the protrusion 114 on the battery housing 102, providing a guarantee for possible helium detection fluid passages. After that, the assembly of other parts of the battery is carried out, such as installing the seal 106 and injecting electrolyte.

[0067] Therefore, according to the battery provided in the third aspect of this utility model, whether it includes an upper plastic layer or an electrode structure, the presence of the conductive groove 104 greatly improves the reliability of battery quality testing. In the helium gas testing process, if the seal 106 is missing, the conductive groove 104 can quickly establish a fluid passage between the inside and outside of the battery, allowing the testing equipment to quickly detect the anomaly, preventing substandard batteries from entering the market, and reducing after-sales risks and costs. From a performance assurance perspective: the reasonable application of the upper plastic layer and electrode structure ensures the battery's sealing and insulation. During normal assembly, the seal 106 and the upper plastic layer work together to prevent electrolyte leakage and the intrusion of external impurities, stabilizing the internal chemical environment of the battery and maintaining stable battery performance. The cooperation between the terminal post 116 and the upper plastic layer ensures the smooth output of electrical energy from the battery, improving the battery's charge and discharge performance and lifespan. From a production efficiency perspective: the modular design concept, whether the upper plastic layer is installed separately or the electrode structure is assembled as a whole, simplifies the battery production process, facilitates automated production, improves production efficiency, reduces errors that may be caused by manual operation, and ensures consistent product quality.

[0068] 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 plastic overcoat, characterized in that, Includes an upper plastic body, on the side of the upper plastic body facing the housing, a through groove is formed, the through groove is recessed along the thickness direction of the upper plastic and extends along the radial direction of the upper plastic body, in the case of missing seal, the through groove is adapted to establish a fluid passage for helium detection between the inside and outside of the battery.

2. The overmold of claim 1, wherein, Along the radial direction of the upper plastic body, the width of the guide groove is greater than or equal to 1 mm.

3. The overmold of claim 1, wherein, Along the thickness direction of the upper plastic body, the depth of the guide groove ranges from 0.1 mm to 0.6 mm.

4. The overmold of claim 1, wherein, The gap between the bottom of the guide groove and the housing is less than 0.6 mm.

5. The overmold of claim 1, wherein, At least two of the guide grooves are formed at intervals on the upper plastic body along the circumferential direction.

6. The overmold of claim 5, wherein, Along the circumferential direction of the upper plastic body, at least three of the aforementioned through grooves are formed at intervals on the upper plastic body, and the spacing between two adjacent through grooves is equal.

7. The overmold of any one of claims 1 to 6, wherein, The upper plastic body includes: An annular portion is disposed between the pole post and the housing, and the conductive groove is formed on the side of the annular portion facing the housing; The boss portion is integrally formed with the annular portion and is located on the outer edge of the annular portion.

8. The overmold of claim 7, wherein, The housing has interconnected crimped portions and protrusions. The crimped portions are located between the upper plastic body and the lower plastic body. A gap is formed between the edge of the protrusion and the edge of the upper plastic body, and the gap is in communication with the fluid passage.

9. An electrode structure, characterized by Includes the pole and the top plastic as described in any one of claims 1 to 8.

10. A battery, characterized by Includes the plastic coating as described in any one of claims 1 to 8; Or the electrode structure as described in claim 9.

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