New energy battery top cover

Abstract

The invention discloses a new energy battery top cover, which comprises a cover plate body, a lower plastic insulation support, a positive electrode assembly, a negative electrode assembly, an explosion-proof valve and an explosion-proof valve protection paster, the positive electrode assembly comprises a positive electrode column, an upper welding aluminum block and a lower welding aluminum block, and the negative electrode assembly comprises a negative electrode column, an upper welding aluminum block and a lower welding copper block. And sealing rings are arranged in gaps among the cover plate body, the lower plastic insulating bracket, the positive electrode assembly and the negative electrode assembly. Integrated injection molding of the upper plastic for fixing the pole and other parts is changed into independent injection molding of the upper plastic, an injection mold and an injection molding process are simplified, a traditional riveting pole is divided into the upper welding aluminum block, the pole, the lower welding aluminum block or the lower welding copper block, welding and fixing are performed after assembly, the structure reliability is guaranteed, and meanwhile the reliability of the structure is improved. The assembly process flow is simplified, the assembly process difficulty is reduced, the assembly efficiency of the top cover is improved, the production cost is reduced, the battery space is released, and the energy density and the safety performance of the new energy battery are improved.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and in particular to a new energy battery top cover. Background Technology

[0002] With the increasing maturity of new energy battery technology, the battery top cover is a key component of the battery. Its functions include welding with the casing to form a sealed cavity, leading out the positive and negative electrodes, and serving as an assembly carrier. Its structure directly affects the reliability and manufacturing cost of the battery pack. Based on these issues, it is necessary to design a reliable, simple, and low-cost new energy battery top cover to improve the energy density of new energy batteries and reduce manufacturing costs.

[0003] The existing top cover structure of new energy batteries usually adopts the method of riveting the poles and then welding them, which is a relatively complex manufacturing process. In addition, the poles generally use copper-aluminum friction welding technology, which poses the risk of breakage at the copper-aluminum joint surface of the positive and negative poles and the risk of the positive and negative terminals falling off from the cover plate, thus reducing the safety of new energy batteries during use.

[0004] Currently, the traditional top cover structure commonly used in new energy batteries weighs up to 90g and has a total height of 19mm. This results in low material utilization efficiency and high material costs. The thick and bulky structure reduces the space utilization rate of new energy batteries, thereby reducing their energy density. The plastic on the positive and negative electrodes used to fix the positive and negative terminals is usually injection molded as a single piece with the positive terminal, cover body, lower plastic insulating support, and sealing ring, leading to complex injection molds and injection molding processes, and high injection molding costs. Summary of the Invention

[0005] To address the issues of traditional new energy battery cover structures being thick and bulky, reducing space utilization and energy density; the complex manufacturing process and high injection molding costs associated with riveting and welding the terminals; and the complex injection molding molds and processes resulting in high costs for the positive and negative electrode plastics, which are typically integrally injection molded with the positive terminal, cover body, lower plastic insulating support, and sealing ring, this invention provides a new energy battery top cover. By changing the integral injection molding of the upper plastic for fixing the terminals to other components, the upper plastic is injection molded separately, simplifying the injection mold and process. The traditional riveted terminals are separated into an upper welded aluminum block, the terminal, and a lower welded aluminum block or lower welded copper block, which are then welded together. This simplifies the assembly process, reduces assembly difficulty, improves assembly efficiency, lowers production costs, frees up battery space, and enhances the energy density and safety performance of the new energy battery, while ensuring structural reliability.

[0006] To achieve the above objectives, the present invention provides a top cover for a new energy battery, comprising a cover body, a lower plastic insulating bracket, a positive electrode assembly, a negative electrode assembly, an explosion-proof valve, and an explosion-proof valve protective patch. The lower plastic insulating bracket is fixedly connected to the bottom surface of the cover body. The negative electrode assembly and the positive electrode assembly are respectively disposed at the left and right ends of the cover body. The explosion-proof valve is disposed in the middle through hole of the cover body. The explosion-proof valve protective patch is disposed above the middle through hole. The positive electrode assembly includes a positive electrode post, an upper welded aluminum block, and a lower welded aluminum block. The upper end of the positive electrode post is fitted inside the upper welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the upper plane of the upper welded aluminum block. A positive upper plastic is fitted on the outside of the upper welded aluminum block. The positive upper plastic is fitted in the upper groove of the cover body. The lower end of the positive electrode post is fitted inside the lower welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the lower plane of the lower welded aluminum block. The lower welded aluminum block is fitted in the bottom groove of the lower plastic insulating bracket. The negative electrode assembly includes a negative electrode post, an upper welded aluminum block, and a lower welded copper block. The upper end of the negative electrode post is fitted inside the upper welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the upper plane of the upper welded aluminum block. A negative electrode upper plastic is fitted on the outside of the upper welded aluminum block. The bottom of the negative electrode upper plastic is fixedly connected to the upper groove of the cover plate body. The lower end of the negative electrode post is fitted inside the lower welded copper block and welded and fixedly connected. The weld seam does not protrude above the lower plane of the lower welded copper block. The lower welded copper block is fitted inside the bottom groove of the lower plastic insulating bracket. A sealing ring is provided in the gap between the cover plate body, the lower plastic insulating bracket and the positive electrode component, for sealing between the positive electrode component and the cover plate body and the lower plastic insulating bracket; A sealing ring is provided in the gap between the cover plate body, the lower plastic insulating bracket and the negative electrode assembly, for sealing between the negative electrode assembly and the cover plate body and the lower plastic insulating bracket.

[0007] Preferably, the cover plate body has a first groove on the upper plane corresponding to the positive and negative terminals, the bottom of the first groove has a coaxial first through hole, the lower end of the first through hole has a coaxial second groove, the positive and negative plastics are respectively fitted into the first grooves at the left and right ends of the cover plate body, and the bottom surfaces of the positive and negative plastics are in contact with the bottom surfaces of the first grooves. The lower plastic insulating bracket has protrusions on its upper surface corresponding to the positive and negative terminals. The protrusions have a second through hole in the middle and a third groove at the lower end of the second through hole. The lower welded aluminum block and the lower welded copper block are respectively fitted into the third grooves at the left and right ends of the lower plastic insulating bracket.

[0008] Preferably, a fourth groove is provided in the middle of the upper plastic surface of the positive electrode, and a third through hole is provided at the bottom of the fourth groove; The upper surface of the plastic on the negative electrode is provided with a fifth groove in the middle, and the bottom of the fifth groove is provided with a coaxial fourth through hole; The upper welded aluminum blocks that cooperate with the positive and negative terminals are respectively fitted into the fourth and fifth grooves.

[0009] Preferably, the plastic on the positive electrode is made of a modified plastic material with conductive function or a conventional plastic material with insulating function, so that the positive electrode component and the cover plate body can achieve electrical conduction function or insulation function; the plastic on the negative electrode is made of a conventional plastic material with insulating function, so that the negative electrode component and the cover plate body can achieve insulation function. Preferably, the cover plate body has anti-fool holes at the lower left, upper right and lower right corners of the bottom surface of the first groove on the left side, and anti-fool holes at the upper left and lower right corners of the bottom surface of the first groove on the right side. On the plastic bottom surface of the positive electrode, there are anti-foolproof protrusions that are designed to engage with the three anti-foolproof holes in the first groove on the left side of the cover plate body. On the plastic bottom surface of the negative electrode, there are anti-foolproof protrusions that are designed to engage with the two anti-foolproof holes in the first groove on the right side of the cover plate body.

[0010] Preferably, the positive electrode post includes a first upper boss, a second upper boss, a middle flange, and a lower boss connected sequentially from top to bottom; The upper surface of the upper welded aluminum block is provided with a sixth groove, and the bottom surface of the sixth groove is provided with a coaxial fifth through hole. The first upper boss of the positive electrode post is sleeved in the fifth through hole of the upper welded aluminum block. The upper end face of the positive electrode post is flush with the bottom surface of the sixth groove and is welded and fixedly connected. The weld seam is not higher than the upper surface of the upper welded aluminum block. The upper surface of the lower welded aluminum block is provided with a sixth through hole in the middle, and a coaxial seventh groove is provided below the sixth through hole. The lower boss of the positive electrode post is sleeved in the sixth through hole. The lower end face of the positive electrode post is flush with the bottom surface of the seventh groove and is welded and fixedly connected. The weld seam does not protrude above the lower end face of the lower welded aluminum block. The negative electrode post has the same structure as the positive electrode post and is located on the same horizontal plane and is flush with it; the lower welding copper block has the same structure as the lower welding aluminum block, and the negative electrode assembly connection structure has the same connection structure as the positive electrode assembly.

[0011] Preferably, the sealing ring is configured as a Z-shaped ring structure, with an inwardly extending inner flange on the inner side of the upper end and an outwardly extending outer flange on the outer side of the lower end. The sealing ring is sleeved on the outer side of the second upper boss and the middle flange of the positive electrode post. The upper and lower planes of the outer flange of the sealing ring are pressed and sealed with the bottom surface of the second groove of the cover plate body and the upper plane of the lower welded aluminum block, respectively. The upper and lower planes of the inner flange are pressed and sealed with the lower plane of the upper welded aluminum block and the upper plane of the middle flange of the positive electrode post, respectively. The connection structure of the negative electrode component and the sealing ring is the same as that of the positive electrode component and the sealing ring.

[0012] Preferably, the bottom of both the positive electrode plastic and the negative electrode plastic is provided with four exhaust grooves. The four exhaust grooves are centrally symmetrically distributed and perpendicular to the four sides respectively. The outer end of the exhaust groove penetrates the corresponding side and the inner end is connected to the corresponding third or fourth through hole. The lower plastic insulating bracket has exhaust grooves on both the left and right sides of the third groove at the bottom.

[0013] When welding and assembling the positive and negative terminals, the internal air can be discharged through the aforementioned venting grooves to ensure the sealing effect of the sealing ring.

[0014] Preferably, the positive electrode post, the upper welding aluminum block, and the lower welding aluminum block are all formed by stamping aluminum sheet, the negative electrode post is formed by stamping copper-aluminum composite plate with aluminum at the upper end and copper at the lower end, and the lower welding copper block is formed by stamping copper sheet. The height of the positive electrode assembly and the negative electrode assembly is set to h≤6.0mm, and the total height of the top cover of the new energy battery is set to 6~10mm.

[0015] In this invention, the positive electrode post, the upper welding aluminum block, and the lower welding aluminum block are all formed by stamping aluminum sheets, which saves the cost of traditional positive electrode post shape processing. The negative electrode post is formed by direct stamping of copper-aluminum composite plate. The upper welding aluminum block and the lower welding copper block of the negative electrode are both formed by stamping aluminum sheets, which saves the cost of traditional negative electrode post friction welding process, as well as the cost of shape processing.

[0016] Preferably, the left-side boss and left-side third groove of the lower plastic insulating bracket, the left-side second groove of the cover plate body, and the upper right corner of the lower welded aluminum block are all provided with mutually cooperating right chamfers; the right-side boss and right-side third groove of the lower plastic insulating bracket, the right-side second groove of the cover plate body, and the upper left corner of the lower welded copper block are all provided with mutually cooperating left chamfers.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention simplifies the injection mold and injection process and reduces injection costs by changing the injection molding of the upper plastic of the fixed pole to be injection molded separately from other parts. 2. This invention breaks down the traditional riveted pole into an upper welded aluminum block, a pole, and a lower welded aluminum block or a lower welded copper block. After assembly, the parts are welded together and fixed. While ensuring structural reliability, this invention simplifies the assembly process of the top cover of the new energy battery, reduces the difficulty of the assembly process, improves the assembly efficiency of the top cover, and reduces production costs.

[0018] 3. All parts of the positive and negative electrode components of this invention are formed by sheet metal stamping, which simplifies the process flow, improves product consistency, has a high yield rate, and saves the cost of traditional electrode metal processing. The negative electrode is formed by stamping copper-aluminum composite plate, which saves the cost of friction welding between copper and aluminum materials of the negative electrode.

[0019] 4. The present invention has strong structural reliability, simple manufacturing process and low cost, which greatly reduces the height of the top cover of the new energy battery from the traditional 19mm to 6-10mm, reduces the weight of the top cover of the new energy battery, frees up battery space and improves the energy density and safety performance of the new energy battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded structure of an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 These are schematic diagrams of the front and back structures of the cover plate body according to an embodiment of the present invention; Figure 6 These are schematic diagrams of the front and back structures of the plastic insulating bracket according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the front and back structures of the plastic on the positive electrode in an embodiment of the present invention; Figure 8 This is a schematic diagram of the positive and negative structures of the plastic on the negative electrode according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the positive and negative structures of the positive electrode post according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the sealing component structure according to an embodiment of the present invention.

[0021] In the diagram: 1. Cover plate body, 101. First groove, 102. First through hole, 103. Anti-fool hole, 104. Second groove, 105. Inverted hole; 2. Lower plastic insulating bracket, 201. Boss, 202. Second through hole, 203. Hot melt column, 204. Third groove, 205. Vent groove; 3. Positive electrode post, 301. First upper boss, 302. Second upper boss, 303. Middle flange, 304. Lower boss. 4. Upper welded aluminum block, 401, sixth groove, 402, fifth through hole; 5. Lower welded aluminum block, 501, sixth through hole, 502, seventh groove; 6. Positive electrode plastic, 601, fourth groove, 602, third through hole; 603, anti-mistake protrusion, 604, vent groove; 7. Sealing ring, 701, inner convex stage, 702, outer flange; 8. Negative electrode post; 9. Lower welded copper block, 901, 902; 10. Negative electrode plastic, 1001, fifth groove, 1002, fourth through hole, 1003, anti-mistake protrusion, 1004, vent groove. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-10 As shown, this embodiment of the invention includes a cover plate body 1, a lower plastic insulating bracket 2, a positive electrode assembly, a negative electrode assembly, an explosion-proof valve 11, and an explosion-proof valve protective patch 12. The lower plastic insulating bracket 2 is fixedly connected to the bottom surface of the cover plate body 1. The negative electrode assembly and the positive electrode assembly are respectively disposed at the left and right ends of the cover plate body 1. The explosion-proof valve 11 is disposed in the middle through hole of the cover plate body 1, and the explosion-proof valve protective patch 12 is disposed above the middle through hole. The positive electrode assembly includes a positive electrode post 3 and an upper welded aluminum block. 4 and the lower welding aluminum block 5, the upper end of the positive electrode post 3 is fitted inside the upper welding aluminum block 4 and welded and fixedly connected, the weld seam is not higher than the upper plane of the upper welding aluminum block 4, the outer side of the upper welding aluminum block 4 is fitted with the positive electrode upper plastic 6, the positive electrode upper plastic 6 is fitted in the upper groove of the cover plate body 1, the lower end of the positive electrode post 3 is fitted inside the lower welding aluminum block 5 and welded and fixedly connected, the weld seam is not higher than the lower plane of the lower welding aluminum block 5, the lower welding aluminum block 5 is fitted in the bottom groove of the lower plastic insulating bracket 2; The negative electrode assembly includes a negative electrode post 8, an upper welded aluminum block 4, and a lower welded copper block 9. The upper end of the negative electrode post 8 is fitted inside the upper welded aluminum block 4 and welded and fixedly connected. The weld seam does not protrude above the upper plane of the upper welded aluminum block 4. The outer side of the upper welded aluminum block 4 is fitted with a negative electrode upper plastic 10. The bottom of the negative electrode upper plastic 10 is fixedly connected to the upper groove of the cover plate body 1. The lower end of the negative electrode post 8 is fitted inside the lower welded copper block 9 and welded and fixedly connected. The weld seam does not protrude above the lower plane of the lower welded copper block 9. The lower welded copper block 9 is fitted inside the bottom groove of the lower plastic insulating bracket 2. A sealing ring 7 is provided in the gap between the cover plate body 1, the lower plastic insulating bracket 2 and the positive electrode component, for sealing between the positive electrode component and the cover plate body 1 and the lower plastic insulating bracket 2; A sealing ring 7 is provided in the gap between the cover plate body 1, the lower plastic insulating bracket 2 and the negative electrode assembly, for sealing between the negative electrode assembly and the cover plate body 1 and the lower plastic insulating bracket 2.

[0024] In this embodiment, the plastic 6 on the positive electrode of the fixed positive electrode post 3 and the plastic 10 on the negative electrode of the fixed negative electrode post 8 are injection molded together with other components, but instead the plastic 6 on the positive electrode and the plastic 10 on the negative electrode are injection molded separately. This simplifies the injection mold and injection process and reduces the injection cost. In this embodiment, the traditional riveted positive electrode post is disassembled into an upper welded aluminum block 4, a positive electrode post 3, and a lower welded aluminum block 5, which are then assembled and welded together. Similarly, the traditional riveted negative electrode post is disassembled into an upper welded aluminum block 4, a negative electrode post 8, and a lower welded copper block 10, which are then assembled and welded together. This approach simplifies the assembly process of the new energy battery top cover while ensuring structural reliability, reduces the difficulty of the assembly process, improves the assembly efficiency of the top cover, and lowers production costs.

[0025] Preferably, the cover plate body 1 has a first groove 101 on the upper plane corresponding to the positive electrode post 3 and the negative electrode post 8. The bottom of the first groove 101 has a coaxial first through hole 102. The lower end of the first through hole 102 has a coaxial second groove 104. The positive electrode plastic 6 and the negative electrode plastic 10 are respectively fitted into the first groove 101 at the left and right ends of the cover plate body 1. The bottom surfaces of the positive electrode plastic 6 and the negative electrode plastic 10 are in contact with the bottom surface of the first groove 101. On the upper plane of the lower plastic insulating bracket 2, there are protrusions 201 at the corresponding positions of the positive terminal 3 and the negative terminal 8. The protrusions 201 have a coaxial second through hole 202 in the middle. The lower end of the second through hole 202 has a coaxial third groove 204. The lower welded aluminum block 5 and the lower welded copper block 9 are respectively fitted into the third grooves 204 at the left and right ends of the lower plastic insulating bracket 2.

[0026] Preferably, a fourth groove 601 is provided in the middle of the upper plane of the plastic 6 on the positive electrode, and a third through hole 602 is provided at the bottom of the fourth groove 601. The upper surface of the plastic 10 on the negative electrode is provided with a fifth groove 1001 in the middle, and the bottom of the fifth groove 1001 is provided with a coaxial fourth through hole 1002; The upper welded aluminum block 4, which cooperates with the positive electrode post 3 and the negative electrode post 8, is respectively fitted into the fourth groove 601 and the fifth groove 1001.

[0027] Preferably, the plastic 6 on the positive electrode is made of a modified plastic material with conductive function or a conventional plastic material with insulating function, so that the positive electrode component and the cover plate body 1 can achieve electrical conduction function or insulation function; the plastic 10 on the negative electrode is made of a conventional plastic material with insulating function, so that the negative electrode component and the cover plate body 1 can achieve insulation function. Depending on customer requirements, some customers require the positive electrode component to be conductive with the cover plate body 1. In this case, the plastic 6 on the positive electrode is made of a modified plastic material with conductive function. Other customers require the positive electrode component to be insulated from the cover plate body 1. In this case, the plastic 6 on the positive electrode is made of a conventional plastic material with insulating function.

[0028] As a preferred embodiment, anti-foolproof holes 103 are provided at the lower left, upper right and lower right corners of the bottom surface of the first groove 101 on the left side of the cover plate body 1, and anti-foolproof holes 103 are provided at the upper left and lower right corners of the bottom surface of the first groove 101 on the right side. On the bottom surface of the positive electrode plastic 6, there are three anti-foolproof protrusions 603 that are in corresponding positions to the three anti-foolproof holes 103 in the first groove 101 on the left side of the cover plate body 1. On the bottom surface of the plastic 10 on the negative electrode, there are two anti-foolproof protrusions 1003 that are matched and snapped together in the corresponding positions of the two anti-foolproof holes 103 in the first groove 101 on the right side of the cover plate body 1.

[0029] The anti-mistake hole 103 and the anti-mistake protrusions 603 and 1003 can prevent errors during the assembly of the plastic 6 on the positive electrode and the plastic 10 on the negative electrode.

[0030] Preferably, the positive electrode post 3 includes a first upper protrusion 301, a second upper protrusion 302, a middle flange 303 and a lower protrusion 304 connected sequentially from top to bottom; The upper surface of the upper welded aluminum block 4 is provided with a sixth groove 401. The bottom surface of the sixth groove 401 is provided with a fifth through hole 402 in the middle. The first upper boss 301 of the positive electrode post 3 is fitted into the fifth through hole 402 of the upper welded aluminum block 4. The upper end face of the positive electrode post 3 is flush with the bottom surface of the sixth groove 401 and is welded and fixedly connected. The weld is not higher than the upper surface of the upper welded aluminum block 4. A sixth through hole 501 is provided in the middle of the upper plane of the lower welded aluminum block 5. A coaxial seventh groove 502 is provided below the sixth through hole 501. The lower boss 304 of the positive electrode post 3 is fitted into the sixth through hole 501. The lower end face of the positive electrode post 3 is flush with the bottom surface of the seventh groove 502 and is welded and fixedly connected. The weld seam does not protrude above the lower end face of the lower welded aluminum block 5. The negative electrode post 8 has the same structure as the positive electrode post 3 and is located on the same horizontal plane and is flush with it; the lower welded copper block 9 has the same structure as the lower welded aluminum block 5, and the connection structure of the negative electrode assembly is the same as that of the positive electrode assembly.

[0031] Preferably, the sealing ring 7 is designed as a Z-shaped ring structure, with an inner flange 701 extending inward on the inner side of the upper end and an outer flange 702 extending outward on the outer side of the lower end. The sealing ring 7 is sleeved on the outer side of the second upper boss 302 and the middle flange 303 of the positive electrode post 3. The upper and lower planes of the outer flange 702 of the sealing ring 7 are pressed and sealed with the bottom surface of the second groove 104 of the cover plate body 1 and the upper plane of the lower welded aluminum block 5, respectively. The upper and lower planes of the inner flange 701 are pressed and sealed with the lower plane of the upper welded aluminum block 4 and the upper plane of the middle flange 303 of the positive electrode post 3, respectively. The connection structure of the negative electrode component and the sealing ring 7 is the same as that of the positive electrode component and the sealing ring 7.

[0032] Preferably, the bottom of the plastic 6 on the positive electrode is provided with four venting grooves 604. The four venting grooves 604 are centrally symmetrically distributed and are perpendicular to the four sides respectively. The outer end of the venting groove 604 passes through the corresponding side and the inner end is connected to the third through hole 602.

[0033] The bottom of the plastic 10 on the negative electrode is provided with four exhaust grooves 1004. The four exhaust grooves 1004 are centrally symmetrically distributed and are perpendicular to the four sides respectively. The outer end of the exhaust groove 1004 passes through the corresponding side and the inner end is connected to the fourth through hole 1002.

[0034] The bottom third groove 203 of the lower plastic insulating bracket 2 is provided with exhaust grooves 205 on both the left and right sides.

[0035] When the positive electrode post 3 is welded to the upper welding aluminum block 4 and the lower welding aluminum block 5, the sealing ring 7 should be tightened. The internal air can be discharged through the venting groove 604 and the venting groove 205, thereby ensuring the seal between the positive electrode post 3 and the cover plate body 1 and the lower plastic insulating bracket 2. When the negative electrode post 8 is welded to the upper welding aluminum block 4 and the lower welding copper block 9, the sealing ring 7 should be tightened. The internal air can be discharged through the venting groove 1004 and the venting groove 205, thereby ensuring the seal between the negative electrode post 8 and the cover plate body 1 and the lower plastic insulating bracket 2.

[0036] As a preferred embodiment, the positive electrode post 3, the upper welding aluminum block 4, and the lower welding aluminum block 5 are all made of aluminum sheet stamping, the negative electrode post 8 is made of copper-aluminum composite plate stamping, the upper end is aluminum and the lower end is copper, and the lower welding copper block 9 is made of copper sheet stamping. The height of the positive electrode assembly and the negative electrode assembly is set to h≤6.0mm, and the total height of the top cover of the new energy battery is set to 6~10mm.

[0037] In this embodiment, all parts of the positive and negative electrode components are formed by sheet metal stamping, which simplifies the process flow, improves product consistency, has a high yield rate, and saves the cost of traditional electrode metal processing. The negative electrode post 8 is formed by stamping copper-aluminum composite plate, which saves the cost of friction welding process between copper and aluminum materials of the negative electrode post 8.

[0038] This embodiment features strong structural reliability, a simple manufacturing process, and low cost, significantly reducing the height of the new energy battery top cover from the traditional 19mm to 6-10mm. This reduces the weight of the new energy battery top cover, frees up battery space, and improves the energy density and safety performance of the new energy battery.

[0039] Preferably, the left side boss 201 and left side third groove 203 of the lower plastic insulating bracket 2, the left side second groove 103 of the cover plate body 1, and the upper right corner of the lower welded aluminum block 5 are all provided with mutually cooperating right chamfers; the right side boss 201 and right side third groove 203 of the lower plastic insulating bracket 2, the right side second groove 103 of the cover plate body 1, and the upper left corner of the lower welded copper block 9 are all provided with mutually cooperating left chamfers.

[0040] The setting of left and right chamfers can prevent errors during the assembly of the lower welding aluminum block 5 and the lower welding copper block 9.

[0041] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A top cover for a new energy battery, comprising a cover body, a lower plastic insulating bracket, a positive electrode assembly, a negative electrode assembly, an explosion-proof valve, and an explosion-proof valve protective patch, wherein the lower plastic insulating bracket is fixedly connected to the bottom surface of the cover body, the negative electrode assembly and the positive electrode assembly are respectively disposed at the left and right ends of the cover body, the explosion-proof valve is disposed in the middle through hole of the cover body, and the explosion-proof valve protective patch is disposed above the middle through hole, characterized in that: The positive electrode assembly includes a positive electrode post, an upper welded aluminum block, and a lower welded aluminum block. The upper end of the positive electrode post is fitted inside the upper welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the upper plane of the upper welded aluminum block. A positive electrode upper plastic is fitted on the outside of the upper welded aluminum block. The positive electrode upper plastic is fitted in the upper groove of the cover plate body. The lower end of the positive electrode post is fitted inside the lower welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the lower plane of the lower welded aluminum block. The lower welded aluminum block is fitted in the bottom groove of the lower plastic insulating bracket. The negative electrode assembly includes a negative electrode post, an upper welded aluminum block, and a lower welded copper block. The upper end of the negative electrode post is fitted inside the upper welded aluminum block and welded and fixedly connected. The weld seam does not protrude above the upper plane of the upper welded aluminum block. A negative electrode upper plastic is fitted on the outside of the upper welded aluminum block. The bottom of the negative electrode upper plastic is fixedly connected to the upper groove of the cover plate body. The lower end of the negative electrode post is fitted inside the lower welded copper block and welded and fixedly connected. The weld seam does not protrude above the lower plane of the lower welded copper block. The lower welded copper block is fitted inside the bottom groove of the lower plastic insulating bracket. A sealing ring is provided in the gap between the cover plate body, the lower plastic insulating bracket and the positive electrode component, for sealing between the positive electrode component and the cover plate body and the lower plastic insulating bracket; A sealing ring is provided in the gap between the cover plate body, the lower plastic insulating bracket and the negative electrode assembly, for sealing between the negative electrode assembly and the cover plate body and the lower plastic insulating bracket.

2. The top cover of a new energy battery according to claim 1, characterized in that: The cover plate body has a first groove on the upper plane corresponding to the positive and negative terminals. The bottom of the first groove has a coaxial first through hole, and the lower end of the first through hole has a coaxial second groove. The plastic on the positive terminal and the plastic on the negative terminal are respectively fitted into the first grooves at the left and right ends of the cover plate body. The bottom surfaces of the plastic on the positive terminal and the plastic on the negative terminal are in contact with the bottom surface of the first groove. The lower plastic insulating bracket has protrusions on its upper surface corresponding to the positive and negative terminals. The protrusions have a second through hole in the middle and a third groove at the lower end of the second through hole. The lower welded aluminum block and the lower welded copper block are respectively fitted into the third grooves at the left and right ends of the lower plastic insulating bracket.

3. The top cover of a new energy battery according to claim 2, characterized in that: The positive electrode has a fourth groove in the middle of the upper plastic surface, and a third through hole is provided at the bottom of the fourth groove; The upper surface of the plastic on the negative electrode is provided with a fifth groove in the middle, and the bottom of the fifth groove is provided with a coaxial fourth through hole; The upper welded aluminum blocks that cooperate with the positive and negative terminals are respectively fitted into the fourth and fifth grooves.

4. The top cover of a new energy battery according to claim 1, characterized in that: The positive electrode uses a modified plastic material with conductive function or a conventional plastic material with insulating function to enable the positive electrode component to conduct electricity or to achieve insulation between the positive electrode component and the cover plate body; the negative electrode uses a conventional plastic material with insulating function to enable the negative electrode component to achieve insulation between the negative electrode component and the cover plate body.

5. A new energy battery top cover according to claim 4, characterized in that: Anti-fool holes are provided at the lower left, upper right and lower right corners of the bottom surface of the first groove on the left side of the cover plate body, and anti-fool holes are provided at the upper left and lower right corners of the bottom surface of the first groove on the right side. On the plastic bottom surface of the positive electrode, there are anti-foolproof protrusions that are designed to engage with the three anti-foolproof holes in the first groove on the left side of the cover plate body. On the plastic bottom surface of the negative electrode, there are anti-foolproof protrusions that are designed to engage with the two anti-foolproof holes in the first groove on the right side of the cover plate body.

6. A new energy battery top cover according to claim 3, characterized in that: The positive electrode post includes a first upper boss, a second upper boss, a middle flange, and a lower boss connected sequentially from top to bottom; The upper surface of the upper welded aluminum block is provided with a sixth groove, and the bottom surface of the sixth groove is provided with a coaxial fifth through hole. The first upper boss of the positive electrode post is sleeved in the fifth through hole of the upper welded aluminum block. The upper end face of the positive electrode post is flush with the bottom surface of the sixth groove and is welded and fixedly connected. The weld seam is not higher than the upper surface of the upper welded aluminum block. The upper surface of the lower welded aluminum block is provided with a sixth through hole in the middle, and a coaxial seventh groove is provided below the sixth through hole. The lower boss of the positive electrode post is sleeved in the sixth through hole. The lower end face of the positive electrode post is flush with the bottom surface of the seventh groove and is welded and fixedly connected. The weld seam does not protrude above the lower end face of the lower welded aluminum block. The negative electrode post has the same structure as the positive electrode post and is located on the same horizontal plane and is flush with it; the lower welding copper block has the same structure as the lower welding aluminum block, and the negative electrode assembly connection structure has the same connection structure as the positive electrode assembly.

7. A new energy battery top cover according to claim 6, characterized in that: The sealing ring is designed as a Z-shaped ring structure, with an inner flange extending inward on the inner side of the upper end and an outer flange extending outward on the outer side of the lower end. The sealing ring is fitted around the second upper boss and the outer side of the middle flange of the positive electrode post. The upper and lower planes of the outer flange of the sealing ring are pressed and sealed with the bottom surface of the second groove of the cover plate body and the upper plane of the lower welded aluminum block, respectively. The upper and lower planes of the inner flange are pressed and sealed with the lower plane of the upper welded aluminum block and the upper plane of the middle flange of the positive electrode post, respectively. The connection structure of the negative electrode component and the sealing ring is the same as that of the positive electrode component and the sealing ring.

8. A new energy battery top cover according to claim 7, characterized in that: The bottom of both the positive and negative plastic electrodes is provided with four venting grooves. The four venting grooves are centrally symmetrically distributed and perpendicular to the four sides respectively. The outer end of the venting grooves passes through the corresponding side, and the inner end is connected to the corresponding third or fourth through hole. The lower plastic insulating bracket has exhaust grooves on both the left and right sides of the third groove at the bottom.

9. A new energy battery top cover according to claim 1, characterized in that: The positive electrode post, the upper welding aluminum block, and the lower welding aluminum block are all formed by stamping aluminum sheets. The negative electrode post is formed by stamping copper-aluminum composite plates, with aluminum at the top and copper at the bottom. The lower welding copper block is formed by stamping copper sheets. The height of the positive electrode assembly and the negative electrode assembly is set to h≤6.0mm, and the total height of the top cover of the new energy battery is set to 6~10mm.

10. A new energy battery top cover according to any one of claims 2 to 9, characterized in that: The left-side boss and left-side third groove of the lower plastic insulating bracket, the left-side second groove of the cover plate body, and the upper right corner of the lower welded aluminum block are all provided with mutually cooperating right chamfers; the right-side boss and right-side third groove of the lower plastic insulating bracket, the right-side second groove of the cover plate body, and the upper left corner of the lower welded copper block are all provided with mutually cooperating left chamfers.

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