Secondary battery and electronic device

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a secondary battery and electronic equipment, which comprise a shell, a pole, an electrode assembly, an upper insulating part and a lower insulating part. Wherein a cover plate is arranged at one end of the shell, and an opening part is formed in the cover plate; the pole penetrates through the opening part and is fixedly connected with the cover plate; the electrode assembly is arranged in the shell and is electrically connected with the pole; the upper insulating part is arranged on one side, far away from the electrode assembly, of the cover plate and is positioned between the cover plate and the pole; the lower insulating part comprises a main body part and an inner edge part, the main body part is arranged on the side, close to the electrode assembly, of the cover plate, the inner edge part is arranged in the center of the main body part, the inner edge part is located between the cover plate and the pole and separates the cover plate and the pole, and the inner edge part and the main body part are independent parts and are fixedly connected with each other. The parts in the secondary battery are connected more firmly, so that the sealing performance and the safety of the secondary battery are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field, concretely is a kind of secondary battery and electronic equipment. BACKGROUND

[0002] Secondary battery, also known as rechargeable battery or storage battery, has been applied to new generation information communication, electric vehicle, energy storage power station and energy internet and other major application fields. In these fields, high requirements are put forward for the sealing and safety of secondary battery. Traditional secondary battery assembly process is often complex, involving accurate assembly and connection of multiple components, which not only leads to low production efficiency, but also easily introduces human error in the assembly process, affecting the consistency and reliability of the battery. At the same time, the secondary battery assembled and shipped out of the factory has the risk of parts falling off and breaking during use, especially when the secondary battery experiences thermal runaway. On the one hand, it may affect the sealing performance of the secondary battery, leading to leakage of electrolyte inside the battery and inability to effectively block the erosion of external environmental factors (such as moisture and oxygen) on the inside of the battery, accelerating the performance degradation of the battery and shortening its service life. On the other hand, it may also increase the risk of local short circuit, reducing the cycle life and safety of the battery.

[0003] In summary, in order to meet the strict requirements of the development of electronic devices and energy storage field on the performance of secondary battery, it is urgent to develop a new type of secondary battery assembly technology to improve the safety, cycle life and production efficiency of the battery, reduce the production cost, and thus promote the wide application and further development of secondary battery technology in various fields. SUMMARY

[0004] To solve the above problems, the utility model provides a kind of secondary battery and electronic equipment, can solve the problem that component is easy to fall off in the assembly process of secondary battery, and the more firm connection between components can guarantee the sealing and safety of secondary battery even if battery thermal runaway occurs, and production cost is also considered.

[0005] The utility model provides a kind of secondary battery in one aspect, including shell, pole, electrode assembly, upper insulating piece, lower insulating piece. Wherein, the one end of shell has cover plate, and cover plate is formed with opening part;Pole passes through opening part, and is fixedly connected with cover plate;Electrode assembly is set in shell, and is electrically connected with pole;Upper insulating piece is set on the side of cover plate away from electrode assembly, between cover plate and pole;Lower insulating piece includes main body part and inner edge part, main body part is set on the side of cover plate close to electrode assembly, inner edge part is set in the center of main body part, and inner edge part is located between cover plate and pole and separates the two, and inner edge part and main body part are independent components and are fixedly connected with each other.

[0006] Optionally, the inner edge portion is made of a material having a higher melting point than the main body portion.

[0007] Optionally, the main body portion and the inner edge portion are fixedly connected to each other by adhesion, welding, riveting, pinning, screwing, hot melting, or fitting.

[0008] Optionally, the main body portion is injection molded on the outer periphery of the inner edge portion, and the inner edge portion and the main body portion are fixedly connected to each other in a manner of fitting at the joint.

[0009] Optionally, the joint includes a protrusion and a recess, the protrusion is arranged on the main body portion, and the recess is arranged on the inner edge portion.

[0010] Optionally, the protrusion includes a column and a flange, the flange is arranged at an end of the column, and the flange has a cross-sectional dimension greater than the column.

[0011] Optionally, the recess has a through hole matching the shape of the column.

[0012] Optionally, the pole post includes a pole post body, an upper pole post flange, and a lower pole post flange, the upper pole post flange is arranged at an end of the pole post body away from the electrode assembly and protrudes outwardly from the pole post body in a radial direction, the lower pole post flange is arranged at an end of the pole post body close to the electrode assembly and protrudes outwardly from the pole post body in the radial direction, and a radially outer end of the inner edge portion extends to a position beyond the lower pole post flange.

[0013] Optionally, the inner edge portion includes an inner edge portion body and a protruding ring, the protruding ring is fitted between the pole post body and the cover plate, the inner edge portion body is arranged between the lower pole post flange and the cover plate, the secondary battery further includes a sealing ring arranged in a space enclosed by the protruding ring, the cover plate, the upper insulating member, the pole post body, and the upper pole post flange, and in a height direction of the secondary battery, two sides of the sealing ring are respectively abutted by the upper pole post flange and the protruding ring.

[0014] The utility model discloses a kind of electronic equipment, which includes the secondary battery described above.

[0015] Specifically, in the assembling process of the secondary battery, the main body portion and the inner edge portion in the split design lower insulating member are fixedly connected in multiple ways, so that in the assembling process of the lower insulating member, the main body portion and the inner edge portion are prevented from separating from each other, the assembly difficulty of the secondary battery is reduced, and the assembly efficiency of the secondary battery is improved. Meanwhile, in the use process of the secondary battery, the reinforced connection between the main body portion and the inner edge portion can significantly reduce the risk of fracture at the connection between the main body portion and the inner edge portion or the lower insulating member falling off from the preset position in the secondary battery, thereby ensuring the sealing performance and safety performance of the secondary battery. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 This is a front view of the secondary battery provided in this embodiment of the utility model.

[0017] Figure 2 These are partial structural cross-sectional views of the secondary battery according to the first and second embodiments of this utility model.

[0018] Figure 3 This is a partial top view of the secondary battery according to the third embodiment of this utility model.

[0019] Figure 4 This is a partial three-dimensional view of the secondary battery according to the fourth embodiment of this utility model.

[0020] Figure 5 This is a partial top view of the secondary battery according to the fourth embodiment of this utility model.

[0021] Figure 6 This is a partial structural cross-sectional view of the secondary battery according to the fourth embodiment of this utility model.

[0022] Reference numerals: 100-Secondary battery, 1-Shell, 11-Cover plate, 12-Opening, 2-Terminal post, 21-Terminal post body, 22-Terminal post upper flange, 23-Terminal post lower flange, 3-Upper insulator, 31-Upper insulator body, 32-Upper insulator protruding ring, 4-Lower insulator, 41-Main body, 411-Protrusion, 4111-Post, 4112-Flange, 42-Inner edge, 421-Recess, 4211-Flanged, 4212-Through hole, 422-Inner edge body, 423-Protruding ring, 5-Sealing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] <First Implementation Method>

[0025] refer to Figure 1 and Figure 2 The secondary battery 100 provided in this embodiment includes a housing 1, a terminal post 2, an electrode assembly (not shown in the figure), an upper insulating member 3, and a lower insulating member 4.

[0026] As an important component of the secondary battery 100, the shell 1 mainly plays a role in containing and protecting the key components such as the electrodes and electrolyte inside the battery, preventing damage to the internal structure of the battery by external factors, and avoiding leakage of harmful substances inside the battery to the external environment.

[0027] In the embodiment, the shell 1 is in a cylindrical shape, which is mainly designed according to the shape of the contents of the secondary battery 100 and the specific use environment of the secondary battery 100. In other embodiments, the shell 1 can also be designed in a cuboid or other shape, which is not specifically limited here. In the secondary battery 100, the shell 1 is required to have good sealing performance to prevent leakage of electrolyte inside the secondary battery 100, dimensional accuracy to accurately match the shell 1 with other components of the secondary battery 100, and compatibility to avoid reaction between the shell 1 and other electrode materials or electrolyte of the secondary battery 100. The shell 1 is usually made of steel shell and aluminum shell, among which the steel shell has high strength and good compression resistance, can withstand a certain degree of external impact, and is suitable for some occasions with high requirements on the mechanical stability of the battery; the aluminum shell has the advantages of light weight and good heat dissipation. In other embodiments, the shell 1 can also be made of plastic materials such as polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS), which is not specifically limited here.

[0028] One end of the shell 1 has a cover plate 11, so that the shell 1 forms a sealed cavity to prevent leakage of electrolyte. An opening part 12 is formed in the middle position of the cover plate 11, which can provide a safe and reliable connection channel for the positive and negative electrode lead-out ends of the battery.

[0029] As another important component of the secondary battery 100, the pole 2 is the lead-out end of the positive and negative electrodes of the secondary battery 100, and is a special structure with strong corrosion resistance. The pole 2 passes through the opening part 12 and is fixedly connected with the cover plate 11, and the electrodes inside the secondary battery 100 are led out to connect the external circuit, and the pole 2 is the interface part of the secondary battery 100 and the external equipment for power transmission. The shape, size, model, etc. of the pole 2 need to be designed and manufactured according to different battery types, current requirements, and environmental adaptability, etc. to ensure its quality and reliability, and improve the performance and service life of the battery. The pole 2 is required to have good electrical conductivity, mechanical strength, processing performance, and good corrosion resistance, and the pole 2 not only bears the current and charge transmission, but also needs to have sufficient mechanical strength to resist external stress, vibration, and temperature change, etc. Therefore, it is very important to ensure the strength of the pole 2 so that it can stably maintain under normal working conditions. Generally, copper, aluminum, stainless steel, etc. can be used as the manufacturing material of the pole 2, which is not specifically limited here.

[0030] The manufacturing process of pole piece 2 generally employs processes such as cold extrusion and hot extrusion. Through the pressing and stretching of a die, the metal material is pressed into a cylindrical shape with precise pores and uniform density to facilitate subsequent assembly and use. (Reference) Figure 2 In this embodiment, the electrode post 2 includes an electrode post body 21, an upper electrode post flange 22, and a lower electrode post flange 23. The upper electrode post flange 22 is located at the end of the electrode post body 21 away from the electrode assembly and protrudes outward in the radial direction from the electrode post body 21. The lower electrode post flange 23 is located at the end of the electrode post body 21 close to the electrode assembly and protrudes outward in the radial direction from the electrode post body 21.

[0031] In this embodiment, an electrode assembly (not shown in the figure) is disposed inside the casing 1, and this electrode assembly is electrically connected to the terminal post 2. The electrode assembly mainly includes positive and negative electrode materials (not shown in the figure) and a separator (not shown in the figure). In the charging state, lithium ions migrate from the positive electrode to the negative electrode through the ion conductor (usually an organic solvent) in the electrolyte and are intercalated in the carbon material of the negative electrode. At the same time, an oxidation reaction occurs at the negative electrode of the battery, forming lithium ions and releasing electrons. In the discharging state, lithium ions are extracted from the negative electrode and return to the positive electrode, completing the discharge process of the battery.

[0032] To maintain insulation between the electrode assembly and the cover plate 11, as well as the terminal posts 2, and to reduce the risk of short-circuit failure of the secondary battery 100, an upper insulating member 3 is disposed between the terminal posts 2 and the cover plate 11, and a lower insulating member 4 is disposed between the cover plate 11 and the electrode assembly. In addition, the lower insulating member 4 can significantly increase the puncture resistance of the battery and improve battery safety.

[0033] In this embodiment, the upper insulating member 3 is disposed on the side of the cover plate 11 away from the electrode assembly, located between the cover plate 11 and the electrode post 2. Specifically, refer to... Figure 2 The upper insulating component 3 includes an upper insulating component body 31 and an upper insulating component protruding ring 32. The upper insulating component body 31 is clamped and fixed by the upper surface of the cover plate 11 and the lower surface of the upper flange 22 of the terminal post, separating the cover plate 11 from the upper flange 22 of the terminal post. This prevents the secondary battery 100 from short-circuiting due to contact between the cover plate 11 and the upper flange 22 of the terminal post, thereby reducing battery life and causing safety accidents. The upper insulating component protruding ring 32 abuts against the outer side of the upper flange 22 of the terminal post and can be used to prevent the upper insulating component 3 from shifting and falling off the upper surface of the cover plate 11. (Reference) Figure 2 When the secondary battery 100 is used and heats up, causing the upper insulating part 3 to melt slightly, the upper flange 22 of the terminal post and the cover plate 11 can still clamp and fix the upper insulating part 3 without affecting the fixation of other parts of the secondary battery 100. Therefore, the upper insulating part 3 has relatively low requirements for the melting point of its manufacturing material.

[0034] To reduce the manufacturing cost of the secondary battery 100 and maintain the isolating function of the lower insulator 4 within the secondary battery 100 to prevent short circuits, in this embodiment, the lower insulator 4 of the secondary battery 100 adopts a split design. The lower insulator 4 includes a main body 41 and an inner edge 42. The main body 41 is disposed on the side of the cover plate 11 near the electrode assembly, and the inner edge 42 is disposed in the center of the main body 41, located between the cover plate 11 and the electrode post 2. The inner edge 42 and the main body 41 are independent components and are fixedly connected to each other. Specifically, refer to... Figure 2 The inner edge portion 42 includes an inner edge body 422 and a protruding ring 423. The protruding ring 423 is embedded between the electrode post body 21 and the cover plate 11. The inner edge body 422 is disposed between the lower flange 23 of the electrode post and the cover plate 11. The electrode post 2 and the cover plate 11 simultaneously contact the inner edge portion 42 and clamp and fix the inner edge portion 42. The inner edge portion 42 separates the electrode post 2 from the cover plate 11, preventing short circuits between the positive and negative electrodes of the secondary battery 100, thereby affecting the battery life. Since the cover plate 11 of the secondary battery 100 may be deformed due to external impacts during use, in order to prevent the deformed cover plate 11 from contacting the electrode assembly and causing a short circuit, a body portion 41 extends from the outer periphery of the inner edge portion 42. The body portion 41 and the inner edge portion 42 together form a lower insulating member 4, preventing contact between the electrode post 2, the cover plate 11 and the electrode assembly, thus preventing a short circuit in the secondary battery 100. During use, the secondary battery 100 may overheat, and even experience thermal runaway. In this case, the area of ​​the terminal 2 near the electrode assembly will experience more significant heating. Prolonged high-temperature heating may cause the inner edge 42 to melt and deform, leading to contact between the terminal 2 and the cover plate 11 and a short circuit. (Reference) Figure 2Typically, in a secondary battery 100, a sealing ring 5 is provided between the terminal post 2 and the cover plate 11 to provide sealing performance for the secondary battery 100. The sealing ring 5 is usually made of rubber-like material, so that it has a certain amount of elastic compression when it is held by the flange 22 and the ring 423 on the upper and lower sides of the terminal post in the preset position of the secondary battery. Because of this, when the material of the inner edge 42 shrinks or melts and deforms under high temperature working environment, the sealing ring 5 will rebound and press down on the cover plate 11, causing a gap between the terminal post 2 and the cover plate 11, thereby affecting the airtightness of the secondary battery 100, reducing the service life of the secondary battery 100, and may further cause contact between the terminal post 2, the cover plate 11 and the electrode assembly, causing the secondary battery 100 to short circuit and causing a safety accident. Therefore, in the manufacturing process of the secondary battery 100, it is necessary to use an electrical insulating material with a higher melting point to make the inner edge 42. This inner edge 42 has better high temperature resistance and will not shrink under high temperature conditions, avoiding the rebound of the sealing ring 5 caused by the shrinkage of the inner edge 42. In contrast, the main body 41 is located further away from the electrode post 2, and the ambient temperature is lower, so there is no need to use the high-melting-point material used in the inner edge 42. Considering the production cost of the secondary battery 100 and the fact that currently available high-melting-point materials are more expensive than low-melting-point materials, in this embodiment, the inner edge 42 is made of a material with a higher melting point than the main body 41, while the main body 41 is made of a low-melting-point material with a lower material cost than the inner edge 42, thus taking into account the manufacturing cost of the lower insulating component 4.

[0035] In this embodiment, the radially outer end of the inner edge 42 extends beyond the lower flange 23 of the pole post, which can effectively prevent the inner edge 42 from shrinking or even melting due to the high temperature of the pole post 2, and prevent short circuit between the pole post 2 and the housing 1.

[0036] The electrical insulation materials commonly used in secondary batteries 100 are polypropylene (PP) and polytetrafluoroethylene (PFA). Both PFA and PP materials possess high-temperature stability, chemical corrosion resistance, and electrical insulation properties. Furthermore, they exhibit good fluidity after melting, facilitating the injection of fluid into the mold and the formation of high-quality components. PFA has a higher melting point than PP, allowing components manufactured using PFA to operate normally in higher-temperature environments without easily melting or deforming, resulting in a relatively longer service life. However, PFA is currently more expensive than PP on the market.

[0037] In this embodiment, considering the production cost and performance maintenance of the secondary battery 100, the main body 41 and the upper insulating member 3 are preferably made of polypropylene (PP) or polyethylene (PE), and the inner edge 42 is preferably made of polytetrafluoroethylene (PFA). In other embodiments of this utility model, other suitable electrical insulating materials may also be used to manufacture the upper insulating member 3 and the lower insulating member 4 of the secondary battery 100, and no specific limitation is made here.

[0038] In this embodiment, the secondary battery 100 further includes a sealing ring 5, which is disposed within the space enclosed by the convex ring 423, the cover plate 11, the upper insulating member 3, the electrode body 21, and the upper flange 22 of the electrode. In the height direction of the secondary battery 100, the two sides of the sealing ring 5 are respectively supported by the upper flange 22 of the electrode and the convex ring 423. Specifically, refer to... Figure 2 The sealing ring 5 forms a tight barrier, preventing electrolyte from seeping out of the secondary battery 100, thus avoiding battery performance degradation or corrosion damage to other components around the secondary battery 100. Simultaneously, the sealing ring 5 also prevents external moisture, dust, oxygen, and other substances from entering the secondary battery 100, maintaining a relatively stable internal environment. Since the electrolyte or other substances inside the secondary battery 100 are corrosive, the sealing ring 5 is typically made of a corrosion-resistant rubber material. On one hand, the elastic potential energy of the rubber allows the sealing ring 5 to be firmly bound to the junction of the terminal body 21 and the terminal flange 22, working together with the convex ring 423, the upper insulating component 3, the terminal body 21, and the terminal flange 22 to fill the gap between the terminal 2 and the cover plate 11, maintaining the sealing performance of the secondary battery 100. On the other hand, during the charging and discharging process of the secondary battery 100, certain gases may be generated inside, such as those produced by lithium-ion batteries under abnormal conditions like overcharging. The sealing ring 5 can regulate the internal pressure of the battery to a certain extent. When the internal pressure increases, the sealing ring 5 can deform appropriately to release some of the pressure.

[0039] refer to Figure 2 and Figure 3In this embodiment, both the main body 41 and the inner edge 42 are annular plates. The inner diameter of the main body 41 is the same as the outer diameter of the inner edge 42. When assembling the secondary battery 100, the inner edge 42 is positioned in the center of the main body 41. If the inner edge of the main body 41 and the outer edge of the inner edge 42 are directly abutted to form the lower insulating member 4, and then the lower insulating member 4 is installed on the outside of the electrode body 21, the main body 41 is prone to separating from the inner edge 42 during this installation process. For the secondary battery assembler, it is difficult to simultaneously install the main body 41 and the inner edge 42 into the preset position of the secondary battery 100, which affects the assembly efficiency. In addition, since there is no strong connection at the junction of the main body 41 and the inner edge 42, when the assembled secondary battery 100 experiences thermal runaway during use, the main body 41 and the inner edge 42 may separate again and fall off from the predetermined assembly position. The above situation may, on the one hand, cause a gap between the terminal post 2 and the opening 12 of the cover plate 11, resulting in a decrease in the internal sealing of the secondary battery 100, and leakage of electrolyte or other battery materials from the casing 1 through the gap, affecting the charging and discharging effect of the secondary battery 100; on the other hand, the detachment of the lower insulating part 4 may cause contact between the electrode assembly, the cover plate 11 and the terminal post 2, causing a short circuit between the positive and negative terminals of the secondary battery 100, affecting the normal use of the secondary battery 100, and may cause a safety accident.

[0040] Therefore, in this embodiment, the connection between the main body 41 and the inner edge 42 of the lower insulating member 4 can be fixedly connected by various methods such as bonding, welding, riveting, pinning, threaded connection, hot melt connection or fitting, thereby avoiding the separation of the main body 41 and the inner edge 42 during the assembly process of the lower insulating member 4 of the secondary battery 100, while reducing the operation difficulty for assembly personnel and improving assembly efficiency.

[0041] <Second Implementation Method>

[0042] As a specific method of thermofusion bonding, to make the connection between the main body 41 and the inner edge 42 of the lower insulating member 4 more secure, in this embodiment, the main body 41 is injection molded onto the outer periphery of the inner edge 42, so that the inner edge 42 and the main body 41 are fixed by interlocking at the joint. Specifically, a high-melting-point electrical insulating material is first heated into a fluid, then poured into the mold of the inner edge 42 and injection molded into the inner edge 42. After the inner edge 42 cools, it is removed from the mold and placed in a predetermined position in the center of the mold of the main body 41 for fixation. Subsequently, a low-melting-point insulating material is heated into a fluid and poured into the mold of the main body 41. After the fluid is completely poured in, the fluid is in complete contact with the outer periphery of the inner edge 42, at which point the upper surface of the fluid is flush with the upper surface of the inner edge main body 422. After the insulating material with a lower melting point is cooled and formed in the mold of the main body 41, the main body 41 is injection molded on the outer periphery of the inner edge 42. The inner periphery of the main body 41 and the outer periphery of the inner edge 42 come into contact and form a molten state, so that the inner edge 42 and the main body 41 are fixed.

[0043] <Third Implementation Method>

[0044] As a specific method of fitting, in the third embodiment of this utility model, the inner edge portion 42 and the main body portion 41 are fixed by fitting together at a joint portion. This joint portion includes a protrusion 411 and a recess 421, wherein the protrusion 411 is disposed on the inner periphery of the main body portion 41, and the recess 421 is disposed on the outer periphery of the inner edge portion 42. The protrusion 411 of the main body portion 41 and the recess 421 of the inner edge portion 42 have matching shapes. (Refer to...) Figure 3 When the inner edge 42 is placed in the center of the main body 41, the protrusions 411 and the recesses 421 correspond one-to-one and interlock to form a tenon-and-mortise structure. The two can be joined in the circular plane direction of the lower insulating member 4 and prevent mutual rotation, so that the inner edge 42 and the main body 41 are fixedly connected to form the lower insulating member 4. In some other embodiments, the recesses 421 may be provided on the inner periphery of the main body 41 and the protrusions 411 may be provided on the outer periphery of the inner edge 42. No specific limitation is made here.

[0045] <Fourth Implementation Method>

[0046] In the second embodiment, considering extreme situations that may occur during the use of the secondary battery 100, such as thermal runaway or external impact, the molten joint between the main body 41 and the inner edge 42 may break and separate due to remelting. Therefore, in this embodiment, the main body 41 and the inner edge 42 are moltenly connected by injection molding, and the improved tenon-and-mortise engagement of the protrusion 411 and the recess 421 is combined to make the connection between the main body 41 and the inner edge 42 more secure. Specifically, a high melting point insulating material is first heated into a fluid, and then the fluid is poured into the mold of the inner edge 42. After the fluid cools, the outer periphery of the molded inner edge 42 has a recess 421, and the recess 421 includes a flared portion 4211 and a through hole 4212 (see...). Figure 4 and Figure 5 Then, keeping the flared portion 4211 facing upwards, place it in the preset position at the center of the main body 41 mold. Then, heat the electrical insulating material with a lower melting point than the inner edge 42 to a fluid state and pour it into the main body 41 mold, ensuring the fluid completely fills the flared portion 4211 and the through hole 4212 of the inner edge 42. The upper surface of the poured fluid is flush with the upper surface of the inner edge main body 422. After the low-melting-point insulating material fluid has completely cooled, the protrusion 411 formed on the inner circumference of the main body 41 and the recess 421 on the outer circumference of the inner edge 42 interlock to form a tenon structure. The two can be joined in the circular plane direction of the lower insulating part 4 and prevent mutual rotation. Simultaneously, the engagement of the protrusion 411 and the recess 421 increases the contact area between the main body 41 and the inner edge 42, further enhancing the fixing effect of the heat-fused connection between the main body 41 and the inner edge 42.

[0047] refer to Figure 5 and Figure 6At the through hole 4212 position of the recess 421 in the inner edge portion 42, a column 4111 and a flange 4112 are formed on the top of the protrusion 411 of the main body portion 41. The flange 4112 is located at the end of the column 4111, and the cross-sectional dimension of the flange 4112 is larger than that of the column 4111. The design of the through hole 4212 in the recess 421 allows the flange 4112 to be injection molded into the through hole 4212 after cooling, further fixing it to the through hole 4212, thereby ensuring a more secure connection between the main body portion 41 and the inner edge portion 42. When the injection-molded main body 41 has completely cooled, the lower insulating member 4, which is firmly locked and heat-fused with the inner edge 42, is installed on the secondary battery 100 for use. Even if the secondary battery 100 heats up, causing slight melting of the joint between the main body 41 and the inner edge 42, or other unexpected situations such as collision, which cause the connection surface between the main body 41 and the inner edge 42 to break, the flange 4112 of the main body 41 cannot be removed from the through hole 4212 of the inner edge 42. At this time, the main body 41 and the inner edge 42 still remain as an integral part of the lower insulating member 4, thereby ensuring that the lower insulating member 4 can still be firmly installed in the predetermined position in the secondary battery 100.

[0048] <Fifth Implementation Method>

[0049] This embodiment provides an electronic device having a secondary battery 100 as described in the first, second, third, and fourth embodiments, and providing electrical energy to the electronic device through the secondary battery 100.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A secondary battery, characterized in that, include: A housing, one end of which has a cover plate having an opening; The pole passes through the opening and is fixedly connected to the cover plate; An electrode assembly is disposed within the housing and electrically connected to the electrode post; An upper insulating member is disposed on the side of the cover plate away from the electrode assembly, and the upper insulating member is located between the cover plate and the electrode post; The lower insulating component includes a main body and an inner edge. The main body is disposed on the side of the cover plate near the electrode assembly, and the inner edge is disposed in the center of the main body. The inner edge is located between the cover plate and the electrode post. The inner edge and the main body are independent components and are fixedly connected to each other.

2. The secondary battery as described in claim 1, characterized in that, The inner edge is made of a material with a higher melting point than the main body.

3. The secondary battery as described in claim 1, characterized in that, The main body and the inner edge are fixedly connected to each other by means of bonding, welding, riveting, pinning, threaded connection, hot melt connection or fitting.

4. The secondary battery as described in claim 3, characterized in that, The main body is injection molded on the outer periphery of the inner edge, and the inner edge and the main body are fixed together by interlocking at the joint.

5. The secondary battery as described in claim 4, characterized in that, The joining portion includes a protrusion and a recess, the protrusion being disposed on the main body portion and the recess being disposed on the inner edge portion.

6. The secondary battery as described in claim 5, characterized in that, The protrusion includes a column and a flange, the flange being disposed at the end of the column, and the cross-sectional dimension of the flange being larger than that of the column.

7. The secondary battery as described in claim 6, characterized in that, The recessed portion has a through hole that matches the shape of the column.

8. The secondary battery as described in claim 1, characterized in that, The electrode post includes an electrode post body, an upper electrode post flange, and a lower electrode post flange. The upper electrode post flange is disposed at the end of the electrode post body away from the electrode assembly and protrudes outward in the radial direction from the electrode post body. The lower electrode post flange is disposed at the end of the electrode post body close to the electrode assembly and protrudes outward in the radial direction from the electrode post body. The radially outer end of the inner edge extends beyond the lower flange of the pole post.

9. The secondary battery as described in claim 8, characterized in that, The inner edge portion includes an inner edge body and a convex ring. The convex ring is embedded between the pole post body and the cover plate. The inner edge body is disposed between the lower flange of the pole post and the cover plate. The secondary battery also includes a sealing ring, which is disposed within the space enclosed by the convex ring, the cover plate, the upper insulating member, the electrode body, and the upper flange of the electrode. In the height direction of the secondary battery, the two sides of the sealing ring are respectively supported by the flange on the electrode post and the convex ring.

10. An electronic device, characterized in that, It has a secondary battery as described in any one of claims 1-9.

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