A battery cell structure

Abstract

The utility model discloses an electric core structure. The electric core structure comprises: a cover plate, a shell and a roll core assembly, the cover plate comprises a pole post assembly, the pole post assembly is provided with a pole post hole, the roll core assembly comprises a pole plate and a roll core, the roll core assembly is located in the shell, the pole plate is fixed to the roll core, the pole plate is sleeved with the pole post hole, the cover plate is sleeved with the shell, and the pole post assembly is fixed by clamping or interference fit. The electric core structure provided by the utility model embodiment can improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to battery technology, and more particularly to a cell structure. Background Technology

[0002] As the core component of a battery, the battery cell plays a role in both storage and power generation. Currently, existing battery cell structures typically employ injection molding to pre-molde the terminal components. This pre-molding process has a low degree of automation, requiring manual assembly and loading, resulting in low efficiency. Utility Model Content

[0003] This utility model provides a battery cell structure to improve assembly efficiency.

[0004] This utility model embodiment provides a battery cell structure, including: a cover plate, a housing, and a core assembly. The cover plate includes an electrode assembly with electrode holes. The core assembly includes an electrode plate and a core. The core assembly is located inside the housing. The electrode plate is fixed to the core and fits into the electrode holes. The cover plate fits into the housing. The electrode assembly is fixedly press-fitted by snap-fit ​​or interference fit.

[0005] Optionally, the electrode assembly includes a pressure ring, plastic, a retaining ring, a sealing ring, and a cover plate; the retaining ring is fixed to the plastic by snap-fit ​​or interference fit, the retaining ring is fixed inside the plastic, the plastic is fixed to the pressure ring by interference fit, the plastic is fixed inside the pressure ring, the sealing ring is located around the cover plate corresponding to the electrode hole, and the pressure ring is press-fitted onto the sealing ring; wherein, the interference fit is an overall interference fit or a partial rib interference fit.

[0006] Optionally, the plastic includes a plastic recess, and the retaining ring includes a retaining ring body and a retaining ring welding part. The retaining ring body is nested inside the plastic recess, and the retaining ring body and the plastic recess are fixed by snap-fit ​​or interference fit.

[0007] Optionally, the plastic has a uniform wall thickness, the top of the plastic is provided with a flange, the top flange of the plastic is higher than the upper surface of the pressure ring, and the bottom of the plastic abuts against the bottom of the cover plate.

[0008] Optionally, the pressure ring is provided with a pressing part and a pressure ring countersunk platform, the pressing part is located at the top of the pressure ring, and the outer side wall of the plastic is interference-fitted with the inner side wall of the pressure ring countersunk platform.

[0009] Optionally, the cover plate is provided with a first recess and a second recess in sequence corresponding to the position of the pole hole. The second recess is located on the side of the first recess that is close to the sealing ring. The pressure ring is nested inside the first recess, and the top of the pressure ring is flush with the top of the first recess.

[0010] Optionally, the sealing ring is provided with a flange and a sealing part, the flange is engaged with the position of the cover plate corresponding to the pole hole, and the sealing part abuts against the upper surface of the first recess.

[0011] Optionally, the electrode plate includes a positive electrode plate and a negative electrode plate, and the core assembly further includes a core support, an insulating film, a positive electrode tab support, and a negative electrode tab support. The core includes a positive electrode tab and a negative electrode tab. The insulating film covers the core assembly. The positive electrode tab and the negative electrode tab are located at the top of the core. The positive electrode plate and the negative electrode plate are respectively fixed to the positive electrode tab and the negative electrode tab. The positive electrode tab support is sandwiched between the positive electrode tab and the negative electrode tab. The positive electrode tab support abuts against the core and the positive electrode plate. The core support is sleeved on the top of the core. The core support is engaged with the positive electrode tab support and the negative electrode tab support by snap-fit.

[0012] Optionally, there is a weld between the pole assembly and the electrode plate, and the weld forms an annular groove structure.

[0013] Optionally, the annular groove is filled with potting compound.

[0014] The battery cell structure provided in this embodiment includes: a cover plate, a housing, and a core assembly. The cover plate includes a terminal post assembly with terminal post holes. The core assembly includes a electrode plate and a core. The core assembly is located inside the housing. The electrode plate is fixed to the core and fits into the terminal post holes. The cover plate fits into the housing. The terminal post assembly is fixed by snap-fit ​​or interference fit. The battery cell structure provided in this embodiment uses a press-fit method instead of the injection molding method in the prior art, thus solving the problem of low automation and low efficiency in the pre-injection molding process of the battery cell's terminal post assembly, which requires manual assembly and feeding. This improves assembly efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a battery cell structure provided in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the appearance of a battery cell provided in an embodiment of this utility model;

[0017] Figure 3This is a schematic diagram of a pole post assembly provided in an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of a core assembly provided in an embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of an assembly of an electrode plate and an electrode post provided in an embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of a weld groove filling method provided in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram showing the thickness of each component in a pole assembly provided by an embodiment of this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0023] Figure 1 This is a schematic diagram of a battery cell structure provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the appearance of a battery cell provided in an embodiment of this utility model. Figure 3 This is a schematic diagram of a pole post assembly provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of a winding core assembly provided in an embodiment of this utility model. (Reference) Figures 1-4 The battery cell 1 structure includes: a cover plate 100, a housing 200, and a core assembly 300. The cover plate 100 includes a terminal assembly 101, which is provided with a terminal hole 102. The core assembly 300 includes a plate 301 and a core 302. The core assembly 300 is located inside the housing 200. The plate 301 is fixed to the core 302 and fits into the terminal hole 102. The cover plate 100 fits into the housing 200. The terminal assembly 101 is fixedly press-fitted by snap-fit ​​or interference fit.

[0024] Specifically, the cover plate 100 is located on top of the housing 200 and fits into the housing 200, protecting the internal components. The terminal assembly 101 includes a positive terminal assembly and a negative terminal assembly, both of which have terminal holes 102. The electrode plate 301 includes a positive electrode plate and a negative electrode plate. The positive electrode plate fits into the terminal hole 102 of the positive terminal assembly, and the negative electrode plate fits into the terminal hole 102 of the negative terminal assembly. The terminal assembly 101 is fixed and press-fitted by snap-fit ​​or interference fit, replacing the injection molding method in the prior art. This solves the problem of low automation and low efficiency in the pre-injection molding process of the terminal assembly of the battery cell, which requires manual assembly and feeding. This improves assembly efficiency.

[0025] The battery cell structure provided in this embodiment includes: a cover plate, a housing, and a core assembly. The cover plate includes an electrode post assembly with electrode post holes. The core assembly includes an electrode plate and a core. The core assembly is located inside the housing. The electrode plate is fixed to the core and fits into the electrode post holes. The cover plate fits into the housing. The electrode post assembly is fixed by snap-fit ​​or interference fit. The battery cell structure provided in this embodiment uses a press-fit method instead of the injection molding method in the prior art, thus solving the problem of low automation and low efficiency in the pre-injection molding process of the electrode post assembly in the prior art, which requires manual assembly and feeding. This improves assembly efficiency.

[0026] refer to Figure 3 Optionally, the pole assembly 101 includes a pressure ring 11, a plastic part 12, a retaining ring 13, a sealing ring 14, and a cover plate 15; the retaining ring 13 is fixed to the plastic part 12 by snap-fit ​​or interference fit, the retaining ring 13 is fixed inside the plastic part 12, the plastic part 12 is fixed to the pressure ring 11 by interference fit, the plastic part 12 is fixed inside the pressure ring 11, the sealing ring 14 is located around the corresponding pole hole of the cover plate 15, and the pressure ring 11 is press-fitted onto the sealing ring 14; wherein, the interference fit is an overall interference fit or a partial rib interference fit.

[0027] Specifically, the outline of the terminal assembly 101 is racetrack-shaped or rectangular, and the pressure ring 11 is a stamped and stretched metal ring, the outline of which is consistent with the retaining ring and the plastic. The pressure ring 11 is press-fitted onto the sealing ring 14, which can compress the sealing ring 14 to achieve a sealing effect. The plastic 12 is fixed inside the pressure ring 11, which can play a role in insulation, isolation, and shock absorption, preventing the terminal assembly 101 from short-circuiting, colliding, and rubbing against other components, and reducing the risk of damage to the terminal assembly 101. The retaining ring 13 is fixed inside the plastic 12, which can play a role in fixing the terminal assembly 101. Furthermore, the interference fit between the retaining ring 13 and the plastic 12, and between the plastic 12 and the pressure ring 11, can make the interference-fitted components tightly connected after assembly, without the need for additional fasteners. For overall interference fits, the entire mating surface needs to be treated during assembly, such as press-fitting. For localized interference fits with raised ribs, the raised ribs of the component need to be aligned and fitted with the corresponding mating surface. The specific interference fit method can be determined according to the actual assembly requirements of the pole assembly and is not limited here. The assembly of the pole assembly 101 can be completed through automated assembly, improving the efficiency of cover plate assembly and reducing cover plate costs.

[0028] For example, both the pressure ring 11 and the cover plate 15 are made of aluminum alloy. Aluminum alloy is lightweight, effectively reducing the weight of the device, and possesses high strength to meet the device's strength requirements. A dense aluminum oxide film easily forms on the surface of aluminum alloy; this oxide film prevents the internal metal from further contacting air, water, and other substances, thus providing excellent corrosion resistance. In harsh outdoor or humid environments, aluminum alloy products can maintain a long service life without excessive protective measures. Aluminum alloy has excellent thermal and electrical conductivity, is easy to process and form, and has good plasticity and machinability. It can be manufactured into products of various shapes and sizes through rolling, extrusion, forging, stamping, and other processing methods to meet different needs. Furthermore, aluminum alloys can be joined using various welding methods, resulting in joints with good strength and sealing, ensuring structural integrity and reliability. Aluminum alloys are non-magnetic materials and do not generate electromagnetic interference. They also offer high machining precision: with modern processing technology, aluminum alloys can achieve high machining accuracy, making them suitable for manufacturing precision-critical components. Finally, aluminum alloys have high recycling value, and the performance loss after recycling is minimal, which is significant for resource conservation and environmental protection, aligning with the concept of sustainable development.

[0029] refer to Figure 3 Optionally, the plastic 12 includes a plastic recessed platform 121, and the retaining ring 13 includes a retaining ring body 131 and a retaining ring welding part 132. The retaining ring body 131 is inserted into the interior of the plastic recessed platform 121, and the retaining ring body 131 and the plastic recessed platform 121 are fixed by snap-fit ​​or interference fit.

[0030] Specifically, such as Figure 3 As shown, the retaining ring welding part 132 is located at the inner top edge of the retaining ring body 131, and is used to provide material for welding at the joint between the retaining ring and the electrode plate. Exemplarily, the retaining ring 13 is made of copper and aluminum alloy; the retaining ring 13 of the positive electrode assembly is made of aluminum alloy, and the retaining ring 13 of the negative electrode assembly is made of copper and aluminum alloy. The plastic 12 can be made of polyphenylene sulfide (PPS), a high-performance thermoplastic engineering plastic with a high heat distortion temperature, typically above 260 degrees Celsius, and some modified PPS can exceed 300 degrees Celsius, allowing it to maintain good physical properties and dimensional stability in high-temperature environments. At high temperatures, PPS has a stable chemical structure, is not prone to thermal decomposition and oxidation, and can withstand high temperatures for extended periods without affecting its performance, allowing for long-term use in high-temperature environments. PPS has high tensile strength and flexural modulus; its high strength and high rigidity enable it to withstand large external forces and stresses. Under long-term external force, it exhibits good creep performance, i.e., small deformation, maintaining a stable shape and size, ensuring that the precision and performance of the component are not affected during long-term use. Polyphenylene sulfide (PPS) possesses excellent electrical insulation properties, with high volume resistivity, low dielectric constant, and low dielectric loss factor, enabling it to effectively isolate current and prevent leakage and short circuits. Under high-frequency conditions, its electrical performance remains stable, with minimal signal transmission loss, ensuring efficient signal transmission and accurate reception. PPS exhibits good resistance to most chemicals, including acids, alkalis, organic solvents, and salt solutions, and is not prone to chemical reactions that could degrade its performance in different chemical environments. PPS also demonstrates good hydrolysis resistance; its performance is not significantly reduced by hydrolysis in humid or wet environments. In its molten state, it exhibits excellent flowability, allowing for rapid filling of mold cavities. This makes it suitable for manufacturing complex-shaped, high-precision parts. Its excellent flowability also results in short molding cycles, high production efficiency, and reduced production costs, making it suitable for large-scale industrial production. Polyphenylene sulfide (PPS) exhibits low and stable shrinkage during molding, enabling precise replication of the mold's shape and dimensions. The resulting products boast high dimensional accuracy and excellent surface quality, reducing subsequent processing steps and improving production efficiency. PPS also possesses excellent flame-retardant properties, achieving high flame-retardant ratings without requiring large amounts of flame retardants, thus enhancing safety during use. Furthermore, PPS has a low coefficient of friction and exhibits self-lubricating properties, reducing friction and wear between components.

[0031] In addition, liquid crystal polymers and polybutylene terephthalate (PET) can also be used in plastics. Liquid crystal polymers are high-performance polymer materials with outstanding thermal stability. Their heat distortion temperature is typically above 200 degrees Celsius, and some high-performance liquid crystal polymers can reach around 350 degrees Celsius, maintaining good physical properties and dimensional stability even at high temperatures. Liquid crystal polymers have an extremely low coefficient of thermal expansion, resulting in minimal dimensional changes under varying temperatures. This allows products made from them to maintain high-precision dimensions and shapes even under significant temperature fluctuations, reducing performance changes and structural damage caused by thermal expansion and contraction. Liquid crystal polymers possess high tensile strength and flexural modulus, with strength and rigidity comparable to metals, enabling them to withstand substantial external forces and stresses. Under repeated stress, liquid crystal polymers exhibit excellent fatigue resistance, withstanding multiple cyclic loads of tension, compression, and bending without easily cracking or damage, extending their service life. Liquid crystal polymers are also excellent electrical insulators, possessing high resistivity and low dielectric constant, effectively preventing current flow and avoiding leakage and short circuits. Liquid crystal polymers (LCPs) exhibit good resistance to most chemicals, and their performance is not significantly affected by acids, alkalis, and organic solvents. They also possess good hydrolysis resistance; their molecular structure remains stable in humid or wet environments, making them less prone to hydrolysis and performance degradation. In their molten state, LCPs exhibit excellent flowability, enabling rapid and uniform filling of mold cavities. This allows for the manufacture of complex-shaped, high-precision parts with short molding cycles, high production efficiency, and reduced production costs, making them suitable for large-scale industrial production. LCPs offer high molding precision, accurately replicating the shape and size of the mold. Dimensional tolerances can be controlled within a very small range, resulting in good surface quality and reducing subsequent processing steps, thus improving production efficiency and product quality. LCPs possess good flame retardant properties, typically achieving high flame retardancy ratings without the need for additional flame retardants. In the event of a fire, they effectively prevent the spread of fire, enhancing safety during use. LCPs also possess a degree of self-lubrication, with a low coefficient of friction, reducing friction and wear between components.

[0032] Polybutylene terephthalate (PET) is a thermoplastic polyester material. In terms of mechanical properties, it possesses high tensile and flexural strength, enabling it to withstand significant external forces and pressures, resulting in parts that are less prone to deformation and damage during use. It also exhibits high impact strength, demonstrating good impact resistance and preventing brittle fracture under impact, thus maintaining good integrity in various working environments and usage conditions. Furthermore, it exhibits minimal dimensional changes under different temperature and humidity conditions, maintaining high precision and stability. Regarding thermal properties, it has a high heat distortion temperature, with some modified versions achieving even higher temperatures, allowing it to maintain good performance even at higher temperatures and preventing softening and deformation. Finally, it possesses certain flame-retardant properties; after modification with flame retardants, its flame-retardant rating can reach a high level, effectively reducing the risk of fire. In terms of chemical properties, polybutylene terephthalate (PET) exhibits good resistance to many chemical substances, such as acids, alkalis, and organic solvents. Its performance is not easily affected by different chemical environments, and it does not experience significant corrosion or swelling. It also demonstrates good stability in humid environments or when in contact with water, and is not prone to hydrolysis that could degrade its performance, allowing it to be used normally in humid or wet working environments. Regarding electrical properties, it possesses excellent electrical insulation properties. Its high volume resistivity and surface resistivity, along with low dielectric constant and dielectric loss tangent, effectively prevent current leakage and electrical short circuits. Under high voltage and strong electric fields, it exhibits good arc resistance, making it less prone to arc discharge and breakdown, ensuring the safe operation of electrical equipment. In terms of processing performance, it has good flowability, allowing for rapid filling of mold cavities during injection molding and other processes, resulting in short molding cycles and high production efficiency. Furthermore, it can be manufactured into various shapes through extrusion, blow molding, and other processing methods to meet the production needs of different products. Polybutylene terephthalate (PET) products can undergo various secondary processing, such as machining, welding, and bonding, which gives them greater flexibility in design and manufacturing. They can be further processed and assembled according to specific usage requirements to improve product performance and functionality.

[0033] refer to Figure 3 Optionally, the plastic 12 has a uniform wall thickness structure, and the top of the plastic 12 is provided with a flange 122. The top flange 122 of the plastic 12 is higher than the upper surface of the pressure ring 11, and the bottom of the plastic 12 abuts against the bottom of the cover plate 15.

[0034] Specifically, the top flange 122 of the plastic 12 is higher than the upper surface of the pressure ring 11. During assembly, this can prevent the pressure ring 11 from short-circuiting with other components due to insufficient height of the plastic 12, and ensure that the inner side of the pressure ring 11 has sufficient height of plastic 12, thereby ensuring the insulation of the pole assembly.

[0035] Continue to refer to Figure 3 Optionally, the pressure ring 11 is provided with a pressing part 111 and a pressure ring recess 112. The pressing part 111 is located on the top of the pressure ring 11, and the outer side wall of the plastic 12 is interference-fitted with the inner side wall of the pressure ring recess 112.

[0036] Specifically, the pressure ring 11 has an opening inside, namely the electrode post hole, and a pressing part 111 at the top. Plastic 12 is assembled inside the pressure ring 11, with the top flange of the plastic passing through the opening inside the pressure ring. To facilitate the interference fit between the plastic 12 and the pressure ring 11, and to facilitate the molding of the pressure ring 11, the angle between the top surface and the side wall of the pressure ring recess 112 is 90° to 105°. In addition, the pressure ring 11 also has a pressure ring welding part 113, located on the outside of the pressure ring recess 112, while the pressing part 111 is located on the top of the pressure ring recess 112 near the outside. The outer wall of the plastic 12 is interference-fitted with the inner wall of the pressure ring recess 112 to ensure the tightness of the electrode post assembly press-fit.

[0037] Continue to refer to Figure 3 Optionally, the cover plate 15 is provided with a first recess 151 and a second recess 152 in sequence at the position corresponding to the pole hole. The second recess 152 is located on the side of the first recess 151 close to the sealing ring 14. The pressure ring 11 is nested inside the first recess 151, and the top of the pressure ring 11 is flush with the top of the first recess 151.

[0038] Specifically, the cover plate 15 has an opening in the middle, namely the pole hole. After the plastic 12 is assembled, it abuts against the upper surface of the first recess 151 of the cover plate 15. After the sealing ring 14 is compressed and deformed, it fills the assembly gap between the first recess 151 and the retaining ring 13 and abuts against the plastic 12 to ensure the overall insulation reliability of the pole assembly.

[0039] Continue to refer to Figure 3 Optionally, the sealing ring 14 is provided with a flange 141 and a sealing part 142. The flange 141 is matched with the position of the corresponding pole hole of the cover plate 15, and the sealing part 142 abuts against the upper surface of the first recess 151.

[0040] The sealing portion 142 of the sealing ring 14 can be made of sealant to seal the electrode assembly, while the flanged portion 141 increases the area of ​​the sealing ring 14, further ensuring the reliability of the seal. Specifically, for example... Figure 3As shown, after the sealing ring 14 is compressed, the pressure ring welding part 113 is pressed into the interior of the first recess 151. The upper surface of the pressure ring welding part 113 is flush with the upper surface of the first recess 151. The joint B1 between the upper surface of the pressure ring welding part 113 and the upper surface of the first recess 151 is fixed by welding. After the sealing ring 14 is compressed, it can ensure the overall sealing performance of the pole assembly. For example, the sealing ring 14 is made of fluororubber, which refers to a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain. Fluororubber has excellent resistance to many chemicals, including strong acids, strong alkalis, organic solvents, greases, etc. Fluororubber seals can work stably for a long time in environments containing various chemical media without swelling, embrittlement, or performance degradation due to contact with chemicals, ensuring the sealing performance and safety of the sealing ring. Even at high temperatures, fluororubber still has strong resistance to chemicals and can be used as a sealing material in processes requiring high-temperature chemical reactions, effectively resisting the corrosion of chemicals. Fluororubber (FUB) possesses high heat resistance, typically allowing for long-term use at temperatures up to 200 degrees Celsius. Some specially formulated FUBs can even maintain good performance at temperatures exceeding 250 degrees Celsius, making them excellent for high-temperature applications. They maintain elasticity and sealing performance at high temperatures, ensuring the reliability of the seals. Furthermore, FUB exhibits excellent anti-aging properties, maintaining stable performance over long-term use. Even under ultraviolet radiation, ozone environments, and prolonged thermo-oxidative stress, the performance degradation of FUB is very slow. Seals made with FUB can withstand long-term exposure to natural environments, resulting in a longer service life and reduced replacement and maintenance costs. FUB is highly resistant to natural environmental factors such as sunlight, rain, and sandstorms, and is not prone to cracking or discoloration. Under various climatic conditions, including cold polar regions and hot, humid tropical regions, FUB seals maintain excellent performance. Fluororubber possesses high tensile and tear strength, enabling it to withstand significant external forces without easily cracking or breaking. Furthermore, it exhibits excellent elasticity and wear resistance, allowing it to adapt well to component movement and friction, maintaining sealing performance and extending service life. In addition, fluororubber boasts superior electrical insulation properties, with high volume resistivity, low dielectric constant, and low dielectric loss factor, effectively ensuring the insulation of the electrode assembly from other components.

[0041] refer to Figure 4Optionally, the electrode plate 301 includes a positive electrode plate 31 and a negative electrode plate 32. The core assembly 300 also includes a core support 303, an insulating film 304, a positive electrode tab support 305, and a negative electrode tab support 306. The core 302 includes a positive electrode tab 33 and a negative electrode tab 34. The insulating film 304 covers the core assembly 300. The positive electrode tab 33 and the negative electrode tab 34 are located on top of the core 303. The positive electrode plate 31 and the negative electrode plate 32 are fixed to the positive electrode tab 33 and the negative electrode tab 34, respectively. The positive electrode tab support 305 is sandwiched between the positive electrode tabs 33, and the negative electrode tab support 306 is sandwiched between the negative electrode tabs 34. The positive electrode tab support 305 abuts against the core 302 and the positive electrode plate 31. The core support 303 is fitted onto the top of the core 302. The core support 303 is engaged with the positive electrode tab support 305 and the negative electrode tab support 306 by snap-fit.

[0042] Specifically, the positive electrode tab 33 and the negative electrode tab 34 are connected to the positive electrode plate 31 and the negative electrode plate 32 respectively by welding. In the height direction, the positive electrode tab bracket 305 (negative electrode tab bracket 306) abuts against the top end face of the core 302 and the bottom end face of the positive electrode plate 31 (negative electrode plate 32) respectively, playing a supporting role. After the above assembly is completed, the core bracket 303 is assembled on the top of the core 302. The core bracket 303 fits on the top of the core from top to bottom. The core bracket 303, the positive electrode tab bracket 305 and the negative electrode tab bracket 306 are fastened together by snaps. Then, the whole is covered with an insulating film 304 to complete the assembly of the core assembly 300.

[0043] Figure 5 This is a schematic diagram of an assembly of an electrode plate and an electrode post according to an embodiment of this utility model. Figure 5 The electrode assembly shown is a negative electrode assembly. The positive electrode assembly has a similar structure to the negative electrode assembly, the difference being in the material of the negative electrode plate and the retaining ring of the electrode assembly. The negative electrode plate 32 is made of copper-aluminum composite material, the first metal layer C1 is aluminum alloy, and the second metal layer C2 is copper. The edge of the negative electrode plate 32 is designed with a flange structure 321, and the flange structure 321 is designed with a stepped edge 322. Both the flange structure 321 and the stepped edge 322 are made of copper. During the assembly and welding of the electrode assembly, the electrode plate is assembled into the interior of the electrode assembly from the bottom upwards. The flange of the electrode plate passes into the interior of the electrode hole, and the stepped edge abuts against the bottom of the retaining ring to limit the position and ensure that the assembly height is fixed. Then, laser welding is performed at the joint B2 between the retaining ring and the electrode plate to seal and fix it. For example, the relationship between the flange height T2 and the plate thickness T3 of the plate flange structure is 0.25*T3≤T2≤0.95*T3; an annular groove structure is formed between the plastic of the electrode assembly and the plate, and the groove depth is 0≤T1≤2.5mm; to ensure the welding process requirements, the distance from the weld to the edge of the plastic is 0.6≤L1≤2mm, and the distance from the weld to the main body edge of the electrode assembly is 0.5≤L2≤1.5mm.

[0044] Figure 6This is a schematic diagram of a weld groove filling method provided in an embodiment of this utility model. (Reference) Figure 6 Optionally, there is a weld between the pole assembly 101 and the pole plate 301, and the weld forms an annular groove structure. The design spacing between the weld and the plastic and the pole body can ensure the welding press-fit and welding space requirements.

[0045] Optionally, the annular groove is filled with potting compound D. This configuration ensures the long-term reliability of the weld and meets the requirements for insulation and sealing. Specifically, the potting compound has excellent insulation properties, isolating the terminal assembly and electrode plate from the external environment and preventing electrical short circuits and leakage, thus improving the electrical safety and stability of the terminal assembly and electrode plate. Some potting compounds can also improve and enhance the electrical performance of the terminal assembly and electrode plate, such as reducing dielectric loss and increasing insulation resistance, which helps improve signal transmission quality and reduce electromagnetic interference, resulting in superior performance of the terminal assembly and electrode plate. After curing, the potting compound has a certain degree of hardness and toughness, providing mechanical protection for the terminal assembly and electrode plate and preventing damage from external impacts and vibrations. Encapsulating adhesive forms a sealed protective layer, effectively preventing moisture and humidity from entering the terminal assembly and plates, thus avoiding short circuits and corrosion caused by dampness. It also prevents dust, oil, and chemical contaminants from entering the terminal assembly and plates, preventing corrosion or performance degradation. The encapsulating adhesive exhibits excellent high and low temperature resistance; it does not soften or deform at high temperatures or crack at low temperatures, maintaining stable performance over a wide temperature range to ensure environmental adaptability. Furthermore, it demonstrates good aging resistance, resisting the effects of ultraviolet radiation, oxygen, ozone, and other environmental factors. Its performance does not significantly decline after long-term use, effectively protecting the terminal assembly and plates, extending the overall lifespan of the battery cell, and reducing maintenance and replacement costs. Encapsulating adhesive typically has good flowability, easily filling gaps and corners during the encapsulation process for complete sealing. The application process is simple, allowing for various methods such as pouring and injection, improving production efficiency and reducing production costs. The potting compound has a certain degree of repairability. It can be removed by heating or dissolving, which facilitates maintenance operations. After maintenance, it can be re-potted without affecting the overall performance of the battery cell.

[0046] Figure 7 This is a schematic diagram showing the thickness of each component in an electrode assembly provided by an embodiment of this utility model. (Refer to...) Figure 7To ensure that the structural strength and insulation performance of the terminal block assembly meet the design requirements, the thickness of each component in the encapsulation part of the terminal block assembly is described as follows: For example, the thickness of the retaining ring A1 is 0.6mm to 1.0mm; the thickness of the plastic between the retaining ring and the retaining ring A2 is 0.6mm to 1.0mm; the thickness of the retaining ring body A3 is 1.3mm to 1.7mm; the thickness of the sealing ring after compression A4 is 0.6mm to 1.0mm; and the thickness of the bottom of the first recess of the cover plate A5 is 1.0mm to 1.8mm.

[0047] It should be noted that the specific dimensions of parameters such as the thickness of each component in this embodiment are only illustrative and can be determined according to actual assembly requirements, and are not limited here.

[0048] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery cell structure, characterized in that, include: The cover plate, housing, and core assembly are provided. The cover plate includes an electrode assembly with an electrode hole. The core assembly includes an electrode plate and a core. The core assembly is located inside the housing. The electrode plate is fixed to the core and fits into the electrode hole. The cover plate fits into the housing. The electrode assembly is fixedly press-fitted by snap-fit ​​or interference fit.

2. The cell structure of claim 1, wherein, The electrode assembly includes a pressure ring, plastic, a retaining ring, a sealing ring, and a cover plate. The retaining ring is fixed to the plastic by snap-fit ​​or interference fit. The retaining ring is fixed inside the plastic. The plastic is fixed to the pressure ring by interference fit. The plastic is fixed inside the pressure ring. The sealing ring is located around the cover plate corresponding to the electrode hole. The pressure ring is press-fitted onto the sealing ring. The interference fit is either a full interference fit or a partial rib interference fit.

3. The cell structure of claim 2, wherein, The plastic includes a plastic recess, and the retaining ring includes a retaining ring body and a retaining ring welding part. The retaining ring body is nested inside the plastic recess, and the retaining ring body and the plastic recess are fixed by snap-fit ​​or interference fit.

4. The cell structure of claim 2, wherein, The plastic has a uniform wall thickness structure, and the top of the plastic is provided with a flange. The top flange of the plastic is higher than the upper surface of the pressure ring, and the bottom of the plastic abuts against the bottom of the cover plate.

5. The cell structure of claim 2, wherein, The pressure ring is provided with a pressing part and a pressure ring countersunk platform. The pressing part is located at the top of the pressure ring, and the outer side wall of the plastic is interference-fitted with the inner side wall of the pressure ring countersunk platform.

6. The cell structure of claim 2, wherein, The cover plate is provided with a first recessed platform and a second recessed platform in sequence corresponding to the position of the pole hole. The second recessed platform is located on the side of the first recessed platform close to the sealing ring. The pressure ring is nested inside the first recessed platform, and the top of the pressure ring is flush with the top of the first recessed platform.

7. The cell structure of claim 6, wherein, The sealing ring is provided with a flange and a sealing part. The flange is engaged with the position of the cover plate corresponding to the pole hole, and the sealing part abuts against the upper surface of the first recess.

8. The cell structure of any one of claims 1-7, wherein, The electrode plate includes a positive electrode plate and a negative electrode plate. The core assembly further includes a core support, an insulating film, a positive electrode tab support, and a negative electrode tab support. The core includes a positive electrode tab and a negative electrode tab. The insulating film covers the core assembly. The positive electrode tab and the negative electrode tab are located at the top of the core. The positive electrode plate and the negative electrode plate are respectively fixed to the positive electrode tab and the negative electrode tab. The positive electrode tab support is sandwiched between the positive electrode tab and the negative electrode tab. The positive electrode tab support abuts against the core and the positive electrode plate. The core support is sleeved on the top of the core. The core support is engaged with the positive electrode tab support and the negative electrode tab support by snap-fit.

9. The cell structure of any of claims 1-8, wherein, There is a weld between the pole assembly and the pole plate, and the weld forms an annular groove structure.

10. The cell structure of claim 9, wherein, The annular groove is filled with potting compound.

Images