Battery top cover structure and battery with same

Abstract

The invention discloses a battery top cover structure and a battery with the battery top cover structure, and the battery top cover structure comprises an insulating part which is provided with a second hole and a liquid injection inlet which are isolated from each other, the second hole is used for air exhaust, and the liquid injection inlet is used for liquid injection; the cover plate is assembled with the insulating part, the cover plate is provided with at least one third hole communicated with the second hole and the liquid injection inlet, the air exhaust hole and the liquid injection opening are separated, the liquid injection process cannot be interfered by air exhaust operation, and therefore the risk of electrolyte overflowing and spraying is reduced. Therefore, the production efficiency and the overall quality of the battery can be improved, the electrolyte can be supplemented more simply and efficiently due to the independent liquid injection port, and extra equipment, manpower and time are not needed any more. Therefore, the production efficiency is improved, the conditions of electrolyte overflowing and spraying are reduced, and the waste of electrolyte resources and the cleaning treatment cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery top cover structure and a battery having the same. Background Art

[0002] In the field of battery manufacturing, especially in the key link of electrolyte injection, the problem of electrolyte bubbling and spraying has long troubled manufacturers, which not only affects the production efficiency of the battery, but also poses a potential threat to the overall quality of the battery and subsequent processing steps. The emergence of these problems is often directly related to the battery cover structure design of the prior art.

[0003] The existing battery cover usually has the same liquid filling port and exhaust hole. Therefore, in order to replenish sufficient electrolyte, additional equipment, manpower and time are required, which greatly affects production efficiency. In addition, the exhaust process can easily cause electrolyte bubbling and spraying, which not only wastes precious electrolyte resources, but also increases additional cleaning and processing costs. The bubbling electrolyte will contaminate the battery top cover and surrounding areas. If it is not cleaned in time, it will directly interfere with the subsequent welding process, increase the risk of explosion welding, and further affect the safety performance and overall quality of the battery. Summary of the invention

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a battery top cover structure and a battery having the same, which can solve the problem of electrolyte bubbling and spraying.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A battery top cover structure comprises: an insulating member provided with a second hole and a liquid injection inlet which are isolated from each other, wherein the second hole is used for exhausting air and the liquid injection inlet is used for injecting liquid; and a cover plate assembled with the insulating member, wherein the cover plate is provided with at least one third hole which is connected with the second hole and the liquid injection inlet.

[0007] By adopting the above solution, since the air extraction hole and the liquid injection port are separated, the air extraction operation will not interfere with the liquid injection process, thereby reducing the risk of electrolyte bubbling and spraying. This helps to improve the production efficiency and overall quality of the battery. The independent liquid injection port makes it easier and more efficient to replenish the electrolyte, and no additional equipment, manpower and time are required. This improves production efficiency, reduces electrolyte bubbling and spraying, and reduces the waste of electrolyte resources and cleaning and processing costs.

[0008] Furthermore, it also includes an annular current collecting plate, which is assembled under the insulating member. The annular current collecting plate includes a first hole, an annular metal pole and a current collecting plate body from the center to the outside. The annular current collecting plate is used to be assembled to the top of the battery roll core, and the first hole is opposite to the exhaust hole in the center of the battery roll core.

[0009] By adopting the above solution, the design of the annular collector plate enables the current to be more evenly distributed and conducted inside the battery, reducing the loss and heat accumulation during current transmission and improving the energy conversion efficiency of the battery. The first hole is directly opposite the exhaust hole in the center of the battery coil, which helps to timely remove the gas generated inside during the battery charging and discharging process and prevent safety problems caused by excessive internal pressure of the battery. At the same time, the structural design of the annular collector plate also helps to disperse the heat inside the battery and reduce the risk of thermal runaway.

[0010] Furthermore, the second hole and the liquid injection inlet are arranged in sequence from the center to the outside by the insulating part, and the liquid injection inlet also includes an electrolyte bridge and an electrolyte diffusion groove outward. The second hole is coaxially arranged with the first hole, and the liquid injection inlet is connected with the electrolyte bridge and the electrolyte diffusion groove in sequence.

[0011] By adopting the above solution, the electrolyte enters the battery through the injection inlet, passes through the electrolyte bridge and flows into the electrolyte diffusion tank. This design allows the electrolyte to be more evenly distributed inside the battery, avoiding local accumulation and waste of electrolyte, and reducing the risk of electrolyte bubbling and spraying during the injection process. The design of the electrolyte diffusion tank helps the electrolyte to better penetrate into various parts of the battery core, improving the utilization rate of the electrolyte. This helps to improve the performance and endurance of the battery.

[0012] Furthermore, the cover plate is sealed and assembled above the insulating member, the third hole is provided with one and is located in the center of the cover plate, the area of ​​the third hole is larger than the areas of the first hole and the second hole, the cover plate also includes a sealing ring and an explosion-proof valve from the center to the outside, and the third hole is coaxially arranged with the second hole.

[0013] By adopting the above solution, the smooth flow of gas and liquid inside the battery is ensured. This design helps to timely remove the gas generated inside the battery during the charging and discharging process, preventing the internal pressure of the battery from being too high. The sealing ring can block the leakage of electrolyte, provide a good closed environment for the internal reaction of the battery, and prevent external impurities from entering the battery and affecting the battery performance. When the internal pressure of the battery rises abnormally, the explosion-proof valve will automatically open to release the internal accumulated pressure, prevent the battery from exploding, and improve safety.

[0014] Furthermore, it also includes a sealing cover, which is connected to and fixed to the annular metal pole.

[0015] By adopting the above solution, the conductive design of the sealing cover and the annular metal pole allows the current to be conducted more smoothly inside the battery, reducing the loss and heat accumulation during current transmission, and effectively preventing the leakage of electrolyte inside the battery. At the same time, it also blocks external air and moisture from entering the battery, thereby ensuring the stable operation of the battery.

[0016] Furthermore, the annular metal pole and the collector plate body are integrally formed.

[0017] By adopting the above solution, the one-piece design simplifies the assembly process of the battery top cover, which not only saves the assembly time and cost of the annular metal pole and the collector plate body, but also helps to reduce quality problems and safety hazards caused by improper assembly, while also improving structural strength and optimizing current transmission.

[0018] Furthermore, the annular metal pole protrudes from the current collecting plate body, and the current collecting plate body has laser welding areas and penetration pressure relief holes arranged at equal intervals along the circumferential outer side of the annular metal pole.

[0019] By adopting the above scheme, laser welding technology is used to weld the collecting plate body to the top of the battery core. Laser welding has the advantages of high energy density, small heat-affected zone, and small welding deformation. It can ensure the stability and reliability of the battery core. The penetration pressure relief hole can play the role of penetrating electrolyte during the initial liquid injection. When high temperature generates gas during the battery charging and discharging process, it can release pressure and play the effect of discharging gas and relieving pressure.

[0020] Furthermore, the number of the laser welding areas and the number of the penetration pressure relief holes are both more than two, and the laser welding areas and the penetration pressure relief holes are arranged in a staggered manner.

[0021] By adopting the above solution, by setting multiple laser welding areas, it is possible to ensure that the battery top cover and the shell are connected at multiple locations with high strength. The design of multiple permeable pressure relief holes can more evenly distribute the pressure inside the battery and prevent battery damage caused by excessive local pressure. At the same time, the pressure relief holes can also serve as heat dissipation channels to help the battery dissipate heat and reduce the battery temperature.

[0022] Furthermore, the top surface of the annular metal pole is provided with more than two avoidance grooves at equal intervals along the circumferential direction, and more than two electrolyte bridges are provided, so that each of the electrolyte bridges can be snapped into one of the avoidance grooves.

[0023] By adopting the above solution, the snap-on design of the avoidance groove and the electrolyte bridge provides a stable mechanical connection, which not only enhances the overall stability of the battery top cover structure, but also ensures the accurate positioning of the electrolyte bridge on the annular metal pole, which can achieve a positioning effect.

[0024] Furthermore, the top surface of the electrolyte bridge is aligned with the top surface of the annular metal pole.

[0025] By adopting the above solution, it is easier to place the electrolyte bridge in the correct position and ensure its close fit with the annular metal pole. This design helps to improve production efficiency, reduce assembly difficulty and cost, and the aligned top surface also helps to enhance the sealing performance of the battery top cover structure.

[0026] Further, the insulating member includes: a plastic lower layer, the plastic lower layer includes a concentric first annular area and a second annular area, the second hole is located in the center of the first annular area, the electrolyte bridge is connected between the first annular area and the second annular area, the injection inlet is arranged on the top surface of the first annular area, the electrolyte diffusion groove is arranged in the second annular area, and each of the electrolyte bridges is connected to an injection inlet and an electrolyte diffusion groove; a plastic upper layer, a plastic opening for avoiding the second hole is arranged in the center of the plastic upper layer, an explosion-proof valve reserved groove corresponding to the explosion-proof valve is arranged on the plastic upper layer, and the plastic upper layer is fixed to the plastic lower layer.

[0027] By adopting the above solution, the stability and reliability of the entire battery top cover structure of the insulating member are ensured, and the function of making the electrolyte diffuse evenly and the characteristic of releasing the internal pressure of the battery in time are achieved.

[0028] Furthermore, a limiting lip is provided at the edge of the plastic lower layer, and the limiting lip is used to abut against the outer side wall of the battery roll core.

[0029] By adopting the above solution, a space for limiting and fixing the battery core can be formed in the limiting lip plate, and the battery core can be fixed at the central position in the battery shell to prevent the battery core from touching the battery shell.

[0030] Furthermore, fused glue nails are arranged between the plastic upper layer and the cover plate.

[0031] By adopting the above solution, the fused glue nails tightly connect the plastic upper layer and the cover plate together through their strong adhesive force and mechanical strength. This connection not only improves the overall stability of the battery top cover, but also ensures the reliability of the battery during long-term use, while also taking into account the sealing and heat transfer functions.

[0032] Furthermore, a concave sealing step is provided on the lower side of the edge of the cover plate, and the sealing step is used to abut and fix with the battery housing.

[0033] By adopting the above solution, the presence of the sealing step increases the contact area between the cover plate and the battery housing, thereby improving the sealing performance therebetween, effectively preventing external moisture, dust and other contaminants from entering the battery, and protecting the battery from damage.

[0034] Furthermore, the electrolyte diffusion tank includes at least two layers of guide plates arranged along the direction of the electrolyte bridge, the guide plates having a first end relatively close to the electrolyte bridge and a second end relatively far away from the electrolyte bridge, and the second end of the guide plate is at least partially located below the guide plate in the adjacent layer, so that the electrolyte flows from one end of each guide plate to the second end and then flows downward.

[0035] By adopting the above scheme, the layered design helps to further refine the flow path of the electrolyte, thereby achieving a more uniform distribution; specifically, after the electrolyte flows through a layer of guide plates, it can smoothly flow under the next layer of guide plates, thereby achieving vertical flow of the electrolyte.

[0036] Furthermore, the sealing cover comprises a stamped pole layer, a welding layer and a riveted layer which are stacked and connected in sequence, the area of ​​the welding layer is larger than the area of ​​the riveted layer and the area of ​​the stamped pole layer, the riveted layer partially extends into the first hole, and the welding layer is abutted and fixed to the cover plate.

[0037] By adopting the above solution, a firm connection between the sealing cover and the cover plate or other components is ensured, and at the same time, in cooperation with the riveting layer, the sealing cover can form a reliable sealing structure inside the battery to prevent external moisture, dust and other contaminants from entering the battery, thereby protecting the electronic components and chemicals inside the battery from damage.

[0038] Furthermore, the side edge of the riveting layer is provided with an anchoring convex edge, the inner side wall of the first hole is provided with a stamping anchoring groove, and the anchoring convex edge is clamped with the stamping anchoring groove.

[0039] By adopting the above solution, the main function of the anchoring flange is to provide additional connection strength and stability, especially in an environment that needs to withstand greater mechanical stress or vibration. By snapping together, the anchoring flange can effectively prevent the sealing cover from loosening or falling off during long-term use; since it can withstand greater mechanical stress and vibration, it can ensure the stability and safety of the battery during long-term use.

[0040] Furthermore, a sealing member is also provided in the first hole, and the sealing member comprises a top cover and a sealing block which are integrally connected, and the sealing block is used for interference connection with the second hole in the center of the insulating member.

[0041] By adopting the above solution, a sealing effect is achieved to prevent external pollutants and gas from entering the battery. In addition, the sealing block also has a certain elasticity and can adapt to the slight deformation or vibration that may occur in the battery during use.

[0042] A battery comprises a battery core, a battery shell and a battery top cover structure, wherein the battery core has an exhaust hole, the battery core is assembled in the battery shell, and the edge of the cover plate is sealed and connected to the battery shell.

[0043] By adopting the above solution, the battery can realize liquid injection and vacuum extraction at the same time, doubling the liquid injection efficiency, solving the problems of liquid bubbling and liquid spraying during injection, and avoiding the problem of electrolyte residue and welding. The overall stacking design improves the consistency of the finished product and increases the yield of manual experiments.

[0044] In summary, the battery top cover structure and the battery having the same provided by the present invention have the following technical effects:

[0045] 1. Since the liquid injection port and the air extraction hole in the battery top cover structure are separated, the liquid injection and air extraction operations can be carried out independently during the battery production process without interfering with each other. This helps to simplify the production process, reduce operation time, and thus improve production efficiency;

[0046] 2. Separate injection ports and air extraction holes help reduce electrolyte bubbling and spraying during the air extraction process. This not only reduces electrolyte waste, but also reduces cleaning and disposal costs, because bubbling electrolyte will contaminate the battery cover and surrounding areas, adding additional cleaning work;

[0047] 3. Independent injection and exhaust systems help ensure that the electrolyte is evenly injected into the battery, avoiding battery performance problems caused by uneven electrolyte distribution. At the same time, reducing electrolyte contamination and waste also helps improve the overall quality and consistency of the battery;

[0048] 4. By optimizing the battery top cover structure, the risk of electrolyte leakage during the battery production process can be reduced, thereby reducing the safety hazards of the battery in subsequent use. In addition, the independent exhaust hole can also help to timely remove internal gas during the battery production process to prevent safety problems caused by excessive internal pressure of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a cross-sectional structure of a battery according to an embodiment of the present invention;

[0050] Figure 2 It is a schematic diagram of the exploded structure of the battery top cover and the spiral wound battery according to an embodiment of the present invention;

[0051] Figure 3It is a schematic diagram of the exploded structure of the annular current collecting plate and the wound core battery according to an embodiment of the present invention;

[0052] Figure 4 It is a schematic diagram of the explosion connection structure of the insulating member according to an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of the explosive connection structure of the cover plate according to an embodiment of the present invention;

[0054] Figure 6 It is a schematic diagram of the explosion connection structure of the sealing cover according to an embodiment of the present invention;

[0055] Figure 7 is a schematic cross-sectional structure diagram of a sealing cover according to an embodiment of the present invention;

[0056] Figure 8 It is a schematic diagram of the top structure of an annular current collecting plate according to an embodiment of the present invention;

[0057] Fig. 9 This is a schematic diagram of the internal structure of the plastic lower layer according to an embodiment of the present invention;

[0058] Fig.10 for Fig. 9 Cross-sectional view at AA in the middle.

[0059] The meanings of the reference numerals are as follows: 1. annular collector plate; 11. first hole; 12. annular metal pole; 121. avoidance groove; 122. stamping anchor groove; 13. collector plate body; 131. laser welding area; 132. penetration pressure relief hole; 2. insulating part; 21. plastic upper layer; 211. plastic opening; 212. explosion-proof valve reserved groove; 213. fused rubber nail; 22. plastic lower layer; 221. second hole; 222. injection inlet; 223. electrolyte bridge ; 224, electrolyte diffusion groove; 2241, guide plate; 225, first circular ring area; 226, second circular ring area; 227, limiting lip plate; 3, cover plate; 31, third hole; 32, sealing ring; 33, explosion-proof valve; 34, sealing step; 4, sealing cover; 41, stamped pole layer; 42, welding layer; 43, riveted layer; 431, anchoring convex edge; 5, seal; 51, top cover; 52, sealing block; 6, battery roll core; 61, exhaust hole; 7, battery shell. DETAILED DESCRIPTION

[0060] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] In order to facilitate the understanding of the embodiments of the present invention, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0064] Embodiment 1 of the present invention refers to Figure 1-10 As shown, a battery top cover 51 structure is disclosed, including: an insulating member 2 and a cover plate 3, the insulating member 2 is provided with a second hole 221 and a liquid injection inlet 222 isolated from each other, the second hole 221 is used for exhausting air, and the liquid injection inlet 222 is used for liquid injection, the cover plate 3 is assembled with the insulating member 2, and the cover plate 3 is provided with at least one third hole 31 connected with the second hole 221 and the liquid injection inlet 222. Since the air extraction hole 61 and the liquid injection port are separated, liquid injection and vacuuming can be carried out at the same time, and the efficiency is improved by at least one time. The air extraction operation will not interfere with the liquid injection process, thereby reducing the risk of electrolyte bubbling and spraying. This helps to improve the production efficiency and overall quality of the battery. The independent liquid injection port makes it easier and more efficient to replenish the electrolyte, and no additional equipment, manpower and time are required. This improves production efficiency, reduces the situation of electrolyte bubbling and spraying, and also reduces the waste of electrolyte resources and cleaning and processing costs.

[0065] In some embodiments, an annular current collecting disk 1 is also included, and the annular current collecting disk 1 is assembled under the insulating member 2. The annular current collecting disk 1 includes a first hole 11, an annular metal pole 12 and a current collecting disk body 13 from the center of the circle to the outside. Preferably, the current collecting disk body 13 and the wound battery core are laser welded. The annular current collecting disk 1 is used to be assembled to the top of the battery coil 6, and the first hole 11 is opposite to the exhaust hole 61 in the center of the battery coil 6. The design of the annular current collecting disk 1 enables the current to be more evenly distributed and conducted inside the battery, reducing the loss and heat accumulation during the current transmission process, and improving the energy conversion efficiency of the battery. The first hole 11 is opposite to the exhaust hole 61 in the center of the battery coil 6, which helps to timely remove the gas generated inside the battery during the charging and discharging process, and prevent safety problems caused by excessive internal pressure of the battery. At the same time, the structural design of the annular current collecting disk 1 also helps to disperse the heat inside the battery and reduce the risk of thermal runaway. Preferably, the annular metal pole 12 and the collector plate body 13 are integrally formed. Since the annular metal pole 12 and the collector plate body 13 are integrally formed, there is no need to fold the collector plate body 13 during the manufacturing and assembly process, which can effectively reduce the risk of short circuit caused by metal parts on the collector plate body 13 touching the shell.

[0066] In some embodiments, the second hole 221 and the injection inlet 222 are sequentially arranged from the center to the outside by the insulating member 2, and the injection inlet 222 also includes an electrolyte bridge 223 and an electrolyte diffusion slot 224 outwardly, and the second hole 221 is coaxially arranged with the first hole 11, and the injection inlet 222 is sequentially connected with the electrolyte bridge 223 and the electrolyte diffusion slot 224, and the electrolyte enters the battery through the injection inlet 222, and flows into the electrolyte diffusion slot 224 after passing through the electrolyte bridge 223. Such a design enables the electrolyte to be more evenly distributed inside the battery, avoids local accumulation and waste of the electrolyte, and reduces the risk of electrolyte bubbling and spraying during the injection process. The design of the electrolyte diffusion slot 224 helps the electrolyte to better penetrate into various parts of the battery roll core 6, thereby improving the utilization rate of the electrolyte. This helps to improve the performance and endurance of the battery.

[0067] Preferably, the cover plate 3 is sealed and assembled above the insulating member 2. Most preferably, the cover plate 3 and the insulating member 2 are fixed with fused glue nails 213 to achieve a fusion effect with the cover plate 3. In this embodiment 1, the third hole 31 is provided with one and is located in the center of the cover plate 3. The area of ​​the third hole 31 is larger than the area of ​​the first hole 11 and the second hole 221, which can avoid contact and conduction between the cover plate 3 and the annular metal pole 12. The area of ​​the second hole 221 is smaller than the first hole 11, so the injection inlet 222 can be exposed to the first hole 11, which is convenient for injection. The cover plate 3 also includes a sealing ring 32 and an explosion-proof valve 33 from the center to the outside. Preferably, the sealing ring 32 is provided at the edge of the third hole 31 to further isolate the cover plate 3 from the annular metal pole 12 and achieve an insulation effect. Preferably, the explosion-proof valve 33 is arc-shaped or C-shaped, and the cover plate 3 is provided with an explosion-proof valve opening corresponding to the explosion-proof valve 33, and the explosion-proof valve opening is distinguished by a blue film. The sealing cover 4 is connected and fixed to the annular metal pole 12, and preferably, the edge of the sealing cover 4 is welded to the cover plate 3.

[0068] The third hole 31 is coaxially arranged with the second hole 221 to ensure smooth flow of gas and liquid inside the battery. Such a design helps to timely remove the gas generated inside the battery during the charging and discharging process to prevent the internal pressure of the battery from being too high. The sealing ring 32 can block the leakage of the electrolyte and provide a good closed environment for the internal reaction of the battery. At the same time, it prevents external impurities from entering the battery and affecting the battery performance. When the internal pressure of the battery rises abnormally, the explosion-proof valve 33 will automatically open to release the internal accumulated pressure, prevent the battery from exploding, and improve safety. In other embodiments, two or more third holes 31 can be provided to correspond to the first hole 11 and the second hole 221 respectively, and this embodiment is not specifically limited.

[0069] In some embodiments, a sealing cover 4 is also included, and the sealing cover 4 is connected and fixed to the annular metal pole 12. The conductive design of the sealing cover 4 and the annular metal pole 12 allows the current to be conducted more smoothly inside the battery, reducing the loss and heat accumulation during the current transmission process, and effectively preventing the leakage of the electrolyte inside the battery. At the same time, it also blocks external air and moisture from entering the battery, thereby ensuring the stable operation of the battery.

[0070] The present invention realizes a multi-layer sealing structure through the combined design of the annular collector plate 1, the insulating member 2, the cover plate 3 and the sealing cover 4. In particular, the design of the injection inlet 222, the electrolyte bridge 223 and the electrolyte diffusion groove 224 in the insulating member 2 is conducive to the smooth flow and uniform distribution of the electrolyte during the injection process, reducing the electrolyte bubbling and spraying caused by pressure or uneven flow; the first hole 11 of the annular collector plate 1 is directly opposite to the exhaust hole 61 in the center of the battery core 6, which helps to timely discharge the gas inside the battery core 6 during the electrolyte injection process, further reducing the risk of electrolyte bubbling and spraying caused by gas pressure; the annular collector plate 1 is designed to be sealed on the top of the battery core 6, which is conducive to the uniform distribution of the electrolyte, and the sealing cover 4 can realize the limiting effect on the battery core 6, preventing the battery core 6 or other metal structural parts from making unnecessary contact with the shell, thereby avoiding the occurrence of battery voltage abnormality or short circuit and other faults. Preferably, in the present embodiment 1, the insulating member 2 is a plastic block, and the cover plate 3 is a plain aluminum sheet.

[0071] In some embodiments, the annular metal pole 12 protrudes from the current collecting plate body 13, so that the annular metal pole 12 can be better assembled, and the current collecting plate body 13 is evenly spaced along the circumferential outer side of the annular metal pole 12 with laser welding areas 131 and penetration pressure relief holes 132. Preferably, there are more than two laser welding areas 131 and penetration pressure relief holes 132, and the laser welding areas 131 and penetration pressure relief holes 132 are arranged in an alternating manner. In the present embodiment 1, four laser welding areas 131 and penetration pressure relief holes 132 are provided, and are arranged alternately in the circumference of the annular metal pole 12. The four laser welding areas 131 are laser welded to the four areas of the battery core 6 respectively, so that the collector plate body 13 and the top of the battery core 6 can be firmly fixed. At the same time, there is a penetration pressure relief hole 132 between each laser welding area 131, which can achieve the effect of electrolyte infiltration covering the battery core 6. At the same time, when the battery is heated, high-temperature and high-pressure gas can be discharged in time and finally converged to the explosion-proof valve 33. Since laser welding has the advantages of high energy density, small heat-affected zone, and small welding deformation, the stability and reliability of the battery core 6 can be ensured.

[0072] It should be noted that in other embodiments, the specific number of laser welding areas 131 and penetration pressure relief holes 132 is not limited, and the staggered arrangement of laser welding areas 131 and penetration pressure relief holes 132 is not limited to staggered in sequence, and it can also be that every two penetration pressure relief holes 132 are staggered with the laser welding areas 131 as a group, or it can be other, which is not specifically limited in this embodiment. By setting up multiple laser welding areas 131, it can be ensured that a high-strength connection is achieved between the battery top cover 51 and the shell at multiple positions. The design of multiple penetration pressure relief holes 132 can more evenly distribute the pressure inside the battery and prevent battery damage caused by excessive local pressure. At the same time, the pressure relief holes can also serve as heat dissipation channels to help the battery dissipate heat and reduce the battery temperature.

[0073] In order to ensure convenient alignment between the annular metal pole 12 and the insulating member 2 and stable installation during installation, more than two avoidance grooves 121 are arranged at equal intervals along the circumferential direction on the top surface of the annular metal pole 12, and more than two electrolyte bridges 223 are arranged so that each of the electrolyte bridges 223 can be snapped into one of the avoidance grooves 121. The snap-on design of the avoidance groove 121 and the electrolyte bridge 223 provides a stable mechanical connection, which not only enhances the overall stability of the battery top cover structure, but also ensures the accurate positioning of the electrolyte bridge 223 on the annular metal pole 12, which can achieve the effect of alignment. In the present embodiment 1, four avoidance grooves 121 are provided, and the four avoidance grooves 121 form a cross shape, which can be assembled corresponding to the four electrolyte bridges 223 of the cross structure to achieve a positioning effect. At the same time, since the electrolyte bridge 223 can be received in the avoidance groove 121, the stacking height of the annular current collecting plate 1 and the insulating member 2 is reduced, thereby reducing the occupation of the longitudinal space of the cover body. Preferably, the top surface of the electrolyte bridge 223 is aligned with the top surface of the annular metal pole 12, which can improve the installation stability between the sealing cover 4 and the annular metal pole 12, and the non-protruding structure avoids increasing the occupation of the longitudinal space of the overall battery cover; due to the avoidance alignment effect of the avoidance groove 121, it is easier to place the electrolyte bridge 223 in the correct position and ensure its close fit with the annular metal pole 12, which helps to improve the production assembly efficiency and reduce the assembly difficulty and cost.

[0074] In some embodiments, in order to better divide the functions of the insulating part 2, avoid mutual interference, and reduce the difficulty of manufacturing, the insulating part 2 is divided into two separate modules for production, including a plastic upper layer 21 and a plastic lower layer 22, the plastic lower layer 22 includes a first circular area 225 and a second circular area 226 that are concentrically arranged, the second hole 221 is located in the center of the first circular area 225, and the electrolyte bridge 223 is connected between the first circular area 225 and the second circular area 226. In this embodiment 1, four electrolyte bridges 223 are provided, which can stably connect the first circular area 225 and the second circular area 226. In other embodiments, the specific number of the electrolyte bridges 223 is not limited, as long as the connection effect can be achieved. The injection inlet 222 is arranged on the top surface of the first annular area 225, the electrolyte diffusion groove 224 is arranged in the second annular area 226, and each of the electrolyte bridges 223 is connected to an injection inlet 222 and an electrolyte diffusion groove 224, and the electrolyte diffusion groove 224 can make the injection inlet 222 quickly disperse evenly after the electrolyte is injected. A plastic opening 211 for avoiding the second hole 221 is arranged in the center of the plastic upper layer 21. Preferably, the size of the plastic opening is consistent with the inner circle radius of the second annular area 226 to avoid interference with the injection. An explosion-proof valve reserved groove 212 corresponding to the explosion-proof valve 33 is arranged on the plastic upper layer 21, and the plastic upper layer 21 is fixed to the plastic lower layer 22. Preferably, the plastic upper layer 21 and the plastic lower layer 22 are bonded and fixed by edge fusion. In other embodiments, the specific fixing method is not limited. The overall design of the insulating member 2 ensures the stability and reliability of the entire battery top cover structure of the insulating member 2, and has the function of evenly diffusing the electrolyte and the characteristic of timely releasing the internal pressure of the battery.

[0075] Preferably, the electrolyte diffusion slot 224 is configured to diffuse in a single direction, specifically, diffuse from the center of the battery coil core 6 to the outside. To achieve the above purpose, in some embodiments, the electrolyte diffusion slot 224 includes at least two layers of guide plates 2241 arranged along the direction of the electrolyte bridge 223. Preferably, the guide plates 2241 in this embodiment 1 are provided with three layers. The guide plates 2241 have a first end relatively close to the electrolyte bridge 223 and a second end relatively far from the electrolyte bridge 223. The second end of the guide plate 2241 is at least partially located below the guide plate 2241 in the adjacent layer, so that the electrolyte flows from one end of each guide plate 2241 to the second end and then flows downward. Such a design can avoid direct upward splashing of the electrolyte when flowing, improve the stability of the flow, and effectively reduce the risk of liquid back-injection and liquid spraying. The layered design helps to further refine the flow path of the electrolyte, thereby achieving a more uniform distribution; specifically, after the electrolyte flows through a layer of guide plate 2241, it can smoothly flow under the next layer of guide plate 2241, thereby achieving vertical flow of the electrolyte and the circumference of the battery. It is conducive to the diffusion of the electrolyte, improves the injection efficiency, and avoids the accumulation of electrolyte. In other embodiments, in addition to the above-mentioned valve-type design, the electrolyte diffusion tank 224 can also adopt other one-way flow channel structures, such as the flow channel of the Tesla valve structure, etc. This embodiment is not specifically limited, and it can increase the diffusion speed of the electrolyte and achieve uniform diffusion of the electrolyte.

[0076] In some embodiments, a limiting lip plate 227 is optionally provided at the edge of the plastic lower layer 22, and the limiting lip plate 227 is used to abut against the outer wall of the battery roll core 6. A space for limiting and fixing the battery roll core 6 can be formed in the limiting lip plate 227, and the battery roll core 6 can be fixed at the central position in the battery housing 7 to prevent the battery roll core 6 from touching the battery housing 7, which can further improve the positioning effect of the battery roll core 6.

[0077] In this embodiment 1, the cover plate 3 and the insulating member 2 are fixed by using fusion glue nails 213. Specifically, the fusion glue nails 213 are provided on the plastic upper layer 21, and the cover plate 3 and the plastic upper layer 21 are fixed by the fusion glue nails 213. The fusion glue nails 213 tightly connect the plastic upper layer 21 and the cover plate 3 together through their strong adhesive force and mechanical strength. This connection not only improves the overall stability of the battery top cover 51, but also ensures the reliability of the battery during long-term use, while also taking into account the sealing function and the heat transfer function.

[0078] Since the cover plate 3 needs to be fixed to the battery housing 7, in order to increase the welding area without increasing the volume of the battery housing 7 and the area of ​​the cover plate 3, a concave sealing step 34 is provided on the lower side of the edge of the cover plate 3. The sealing step 34 is used to abut and fix with the battery housing 7. The presence of the sealing step 34 increases the contact area between the cover plate 3 and the battery housing 7, thereby improving the sealing performance between them, effectively preventing external moisture, dust and other pollutants from entering the battery, and protecting the battery from damage. Preferably, in this embodiment 1, the sealing step 34 is fixed to the battery housing 7 by welding. In other implementations, the specific fixing method is not limited.

[0079] In some embodiments, the sealing cover 4 includes a stamped pole layer 41, a welding layer 42 and a riveting layer 43 which are stacked and connected in sequence, the area of ​​the welding layer 42 is larger than the area of ​​the riveting layer 43 and the area of ​​the stamped pole layer 41, the riveting layer 43 partially extends into the first hole 11, and the welding layer 42 is abutted and fixed with the cover plate 3. During installation, the riveting layer 43 is aligned with the center of the annular metal pole 12, and then the welding layer 42 is stamped and fixed with the pole, so that the riveting layer 43 is riveted to the center of the annular metal pole 12, and then the edge of the welding layer 42 is directly edge-welded with the cover plate 3 to ensure a firm connection between the sealing cover 4 and the cover plate 3 or other components, and at the same time, the riveting layer 43 is cooperated to enable the sealing cover 4 to form a reliable sealing structure inside the battery to prevent external moisture, dust and other pollutants from entering the battery, thereby protecting the electronic components and chemicals inside the battery from damage. Preferably, in this embodiment 1, an anchoring convex edge 431 is provided on the side edge of the riveted layer 43, and a stamped anchoring groove 122 is provided on the inner side wall of the first hole 11, that is, the inner side wall of the annular metal pole 12, and the anchoring convex edge 431 is snap-fitted with the stamped anchoring groove 122, and the snap-fitting of the two provides additional connection strength and stability, especially in an environment that needs to withstand greater mechanical stress or vibration. By snapping, the anchoring convex edge 431 can effectively prevent the sealing cover 4 from loosening or falling off during long-term use; because it can withstand greater mechanical stress and vibration, it can ensure the stability and safety of the battery during long-term use. This embodiment 1 does not limit the specific structure of the anchoring convex edge 431 and the stamped anchoring groove 122, and it is sufficient that the two are adapted to snap-fit.

[0080] In some embodiments, optionally, a sealing member 5 is further provided in the first hole 11, and the sealing member 5 includes an integrally connected top cover 51 and a sealing block 52, and the sealing block 52 is used to be interference-connected with the second hole 221 in the center of the insulating member 2 to close the air extraction hole 61. The top cover 51 is used to resist to the top of the insulating member 2 to prevent the sealing member 5 from completely entering the second hole 221. With this arrangement, the air extraction hole 61 can be sealed to prevent external pollutants and gases from entering the interior of the battery. In addition, the sealing block 52 also has a certain elasticity and can adapt to the slight deformation or vibration that may occur in the battery during use. Preferably, in this embodiment 1, the sealing block 52 is spherical, and a triangular opening is provided at the bottom to increase its own deformation ability and facilitate insertion into the air extraction hole 61.

[0081] The present invention also relates to a battery, comprising a battery core 6, a battery shell 7 and a battery top cover structure, wherein the battery core 6 has an exhaust hole 61, the battery core 6 is assembled in the battery shell 7, and the edge of the cover plate 3 is sealed and connected to the battery shell 7. The battery can realize liquid injection and vacuum extraction at the same time, and the liquid injection efficiency is doubled. At the same time, the problems of liquid bubbling and liquid spraying during liquid injection are solved, and the problem of electrolyte residue and frying welding is avoided. The overall stacking design improves the consistency of the finished product, reduces the loss caused by poor welding, and facilitates the model change and adaptation; it improves the yield rate of manual experiments.

[0082] In summary, the battery top cover structure and the battery having the same provided by the present invention have the following technical effects:

[0083] 1. Since the liquid injection port and the air extraction hole 61 in the battery top cover 51 are separated, the liquid injection and air extraction operations can be performed independently during the battery production process without interfering with each other. This helps to simplify the production process, reduce operation time, and thus improve production efficiency;

[0084] 2. The separate liquid injection port and the air extraction hole 61 help reduce the phenomenon of electrolyte bubbling and spraying during the air extraction process. This not only reduces the waste of electrolyte, but also reduces the cleaning and disposal costs, because the bubbling electrolyte will contaminate the battery top cover 51 and the surrounding area, adding additional cleaning work;

[0085] 3. Independent injection and exhaust systems help ensure that the electrolyte is evenly injected into the battery, avoiding battery performance problems caused by uneven electrolyte distribution. At the same time, reducing electrolyte contamination and waste also helps improve the overall quality and consistency of the battery;

[0086] 4. By optimizing the structure of the battery top cover 51, the risk of electrolyte leakage during the battery production process can be reduced, thereby reducing the safety hazards of the battery in subsequent use. In addition, the independent exhaust hole 61 also helps to timely remove internal gas during the battery production process to prevent safety problems caused by excessive internal pressure of the battery;

[0087] 5. Through the carefully designed liquid injection inlet 222, electrolyte bridge 223 and electrolyte diffusion groove 224 in the insulating member 2, the electrolyte can flow smoothly and be evenly distributed during the injection process, avoiding the electrolyte bubbling and spraying problems caused by pressure or uneven flow, which not only improves the accuracy of electrolyte injection, but also reduces electrolyte waste and potential safety hazards. The valve-type electrolyte diffusion groove 224 further reduces the electrolyte bubbling and spraying problems;

[0088] 6. The first hole 11 of the annular current collecting plate 1 faces the exhaust hole 61 in the center of the battery core 6. This design allows the gas generated inside the battery core 6 to be discharged in time during the electrolyte injection process, thereby reducing the risk of electrolyte bubbling and spraying due to gas pressure accumulation. This helps to maintain the pressure balance inside the battery, improve the safety performance of the battery, and can achieve simultaneous injection and vacuum extraction, thereby improving the injection efficiency;

[0089] 7. The combined design of the annular current collecting plate 1, the insulating member 2, the cover plate 3 and the sealing cover 4 realizes a multi-layer sealing structure. This design not only improves the overall sealing of the battery top cover structure, but also prevents external pollutants from entering the battery, protects the electronic components and chemicals inside the battery from damage, and reduces the loss caused by poor welding, making it easier to change models and adapt;

[0090] 8. The annular current collecting plate 1 itself has a non-folding design, which can effectively reduce the metal parts touching the shell. The annular current collecting plate 1 and the insulating part 2 can also limit the battery core 6, preventing the battery core 6 or other metal structural parts on the annular current collecting plate 1 from unnecessary movement or contact in the battery shell 7, thereby avoiding the occurrence of abnormal battery voltage, short circuit and other faults, and improving the reliability and stability of the battery.

[0091] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A battery top cover structure, characterized in that: include: The insulating member (2) is provided with a second hole (221) and a liquid injection inlet (222) which are isolated from each other, wherein the second hole (221) is used for exhausting air, and the liquid injection inlet (222) is used for injecting liquid; A cover plate (3) is assembled with the insulating member (2), and the cover plate (3) is provided with at least one third hole (31) communicating with the second hole (221) and the liquid injection inlet (222).

2. A battery top cover structure according to claim 1, characterized in that: The invention also comprises an annular current collecting disk (1), the annular current collecting disk (1) being mounted below the insulating member (2), the annular current collecting disk (1) comprising, from the center of the circle outward, a first hole (11), an annular metal pole (12) and a current collecting disk body (13), the annular current collecting disk (1) being used for being mounted on the top of the battery coil (6), and the first hole (11) being directly opposite to the exhaust hole (61) in the center of the battery coil (6).

3. A battery top cover structure according to claim 2, characterized in that: The second hole (221) and the liquid injection inlet (222) are arranged in sequence from the center to the outside of the insulating member (2); the liquid injection inlet (222) further includes an electrolyte bridge (223) and an electrolyte diffusion groove (224) outward; the second hole (221) is coaxially arranged with the first hole (11); and the liquid injection inlet (222) is connected in sequence with the electrolyte bridge (223) and the electrolyte diffusion groove (224).

4. A battery top cover structure according to claim 2, characterized in that: The cover plate (3) is sealingly assembled above the insulating member (2); one third hole (31) is provided and is located at the center of the cover plate (3); the area of ​​the third hole (31) is larger than the areas of the first hole (11) and the second hole (221); the cover plate (3) further includes a sealing ring (32) and an explosion-proof valve (33) from the center outward; the third hole (31) is coaxially arranged with the second hole (221).

5. A battery top cover structure according to claim 2, characterized in that: It also comprises a sealing cover (4), wherein the sealing cover (4) is connected to and fixed to the annular metal pole (12).

6. A battery top cover structure according to claim 2, characterized in that: The annular metal pole (12) and the current collecting disc body (13) are integrally formed.

7. A battery top cover structure according to claim 2, characterized in that: The annular metal pole (12) protrudes from the current collecting disc body (13), and the current collecting disc body (13) is provided with laser welding areas (131) and penetration pressure relief holes (132) arranged at equal intervals along the circumferential outer side of the annular metal pole (12).

8. A battery top cover structure according to claim 7, characterized in that: The laser welding areas (131) and the permeation pressure relief holes (132) are each provided with more than two, and the laser welding areas (131) and the permeation pressure relief holes (132) are arranged in a staggered manner.

9. A battery top cover structure according to claim 3, characterized in that: The top surface of the annular metal pole (12) is provided with more than two avoidance grooves (121) at equal intervals along the circumferential direction, and more than two electrolyte bridges (223) are provided, so that each electrolyte bridge (223) can be snapped into one of the avoidance grooves (121).

10. A battery top cover structure according to claim 9, characterized in that: The top surface of the electrolyte bridge (223) is aligned with the top surface of the annular metal pole (12).

11. A battery top cover structure according to claim 3, characterized in that: The insulating member (2) comprises: A plastic lower layer (22), the plastic lower layer (22) comprising a concentric first annular area (225) and a second annular area (226), the second hole (221) being located at the center of the first annular area (225), the electrolyte bridge (223) being connected between the first annular area (225) and the second annular area (226), the injection inlet (222) being arranged on the top surface of the first annular area (225), the electrolyte diffusion groove (224) being arranged in the second annular area (226), and each of the electrolyte bridges (223) being connected to one injection inlet (222) and one electrolyte diffusion groove (224); A plastic upper layer (21), wherein a plastic opening (211) for avoiding the second hole (221) is arranged at the center of the plastic upper layer (21), an explosion-proof valve reserved groove (212) corresponding to the explosion-proof valve (33) is arranged on the plastic upper layer (21), and the plastic upper layer (21) is fixed to the plastic lower layer (22).

12. A battery top cover structure according to claim 11, characterized in that: A limiting lip plate (227) is provided at the edge of the plastic lower layer (22), and the limiting lip plate (227) is used to abut against the outer side wall of the battery winding core (6).

13. A battery top cover structure according to claim 11, characterized in that: A fused glue nail (213) is provided between the plastic upper layer (21) and the cover plate (3).

14. A battery top cover structure according to claim 1, characterized in that: An inwardly concave sealing step (34) is provided on the lower side of the edge of the cover plate (3), and the sealing step (34) is used for abutting and fixing with the battery housing (7).

15. A battery top cover structure according to claim 3 or 11, characterized in that: The electrolyte diffusion tank (224) comprises at least two layers of guide plates (2241) arranged along the direction of the electrolyte bridge (223), the guide plates (2241) having a first end relatively close to the electrolyte bridge (223) and a second end relatively far from the electrolyte bridge (223), the second end of the guide plate (2241) being at least partially located below the guide plate (2241) in an adjacent layer, so that the electrolyte flows from one end of each guide plate (2241) to the second end and then flows downward.

16. A battery top cover structure according to claim 5, characterized in that: The sealing cover (4) comprises a stamped pole layer (41), a welding layer (42) and a riveted layer (43) which are stacked and connected in sequence, the area of ​​the welding layer (42) is larger than the area of ​​the riveted layer (43) and the area of ​​the stamped pole layer (41), the riveted layer (43) partially extends into the first hole (11), and the welding layer (42) is abutted and fixed to the cover plate (3).

17. A battery top cover structure according to claim 16, characterized in that: The side edge of the riveting layer (43) is provided with an anchoring convex edge (431), the inner side wall of the first hole (11) is provided with a stamping anchoring groove (122), and the anchoring convex edge (431) is clamped with the stamping anchoring groove (122).

18. A battery top cover structure according to claim 2, characterized in that: A sealing member (5) is also provided in the first hole (11), the sealing member (5) comprising a top cover (51) and a sealing block (52) which are integrally connected, the sealing block (52) being used for interference connection with the second hole (221) in the center of the insulating member (2).

19. A battery, characterized in that: The invention comprises a battery roll core (6), a battery shell (7) and a battery top cover structure according to any one of claims 1 to 18, wherein the battery roll core (6) has an exhaust hole (61), the battery roll core (6) is assembled in the battery shell (7), and the edge of the cover plate (3) is sealed and connected to the battery shell (7).

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