Riveting battery cover plate

Abstract

The invention discloses a riveted battery cover plate which is characterized by comprising a top cover piece, an anti-explosion valve and an anti-explosion valve protection cover, a first through hole is formed in the middle of the top cover piece, a mounting layer hole is formed in the first through hole, the anti-explosion valve is sleeved with the mounting layer hole, the periphery of the anti-explosion valve is connected with the top cover piece through a first laser welding seam, and the first laser welding seam is formed in the front face of the top cover piece; an annular groove is formed in the top cover piece and located on the periphery of the installation layer hole, an anti-explosion valve protection cover is sleeved with the annular groove, a second through hole is formed in the upper end of the anti-explosion valve protection cover, and a flange is arranged on the outer side wall of the lower end of the anti-explosion valve protection cover. The first laser welding seam of the anti-explosion valve and the top cover piece and the second laser welding seam of the anti-explosion valve protection cover and the top cover piece are arranged on the front face of the top cover piece, liquid electrolyte can be effectively prevented from corroding the welding seams, the safety of the new energy battery is improved, and the service life of the new energy battery is prolonged; and the positive / negative pole is connected with the top cover sheet and the positive / negative connecting sheet in a riveting manner, so that the time and the cost for additionally welding the existing positive / negative connecting sheet are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a riveted battery cover. Background Art

[0002] In recent years, the new energy vehicle market has continued to expand rapidly, driving the rapid growth of the new energy battery market. At present, new energy batteries generally adopt a square aluminum shell structure, which consists of two parts: the shell and the battery cover. The battery cover not only provides a confined space for the new energy battery, but also serves as a medium for energy transmission of the new energy battery. Its structure directly affects the reliability and manufacturing cost of the battery pack. Based on the above problems, it is necessary to design a new energy battery cover with a reliable structure, simple manufacturing process and low cost to improve the energy density of new energy batteries and reduce manufacturing costs.

[0003] At present, new energy batteries generally use traditional cover structures. The welds of the explosion-proof valves are on the back of the cover. Liquid electrolytes can easily corrode the welds, reducing the safety and service life of new energy batteries during use. The positive / negative electrode pin connectors of the existing traditional cover structure are not included in the battery cover. The positive / negative electrode pin connectors need to be welded to the battery cover using another process, which adds extra time and cost. Summary of the invention

[0004] In order to solve the problem that the explosion-proof valve weld in the above-mentioned traditional cover plate structure is arranged on the back of the cover plate, which is easily corroded by the electrolyte, and the positive and negative electrode pin connecting pieces need to be welded to the battery cover plate by another process, the present invention provides a riveted battery cover plate, wherein the explosion-proof valve is arranged in the mounting layer hole of the top cover plate, the first laser weld between the explosion-proof valve fixing part and the top cover plate is arranged on the front side of the top cover plate, an explosion-proof valve protective cover is arranged on the outside of the explosion-proof valve, and the second laser weld between the explosion-proof valve protective cover and the top cover plate is also arranged on the front side of the top cover plate, which can effectively prevent the liquid electrolyte from corroding the weld, thereby improving the safety and service life of the new energy battery; the positive / negative electrode column is fixedly connected to the top cover plate, the positive / negative upper plastic, the lower plastic, the positive / negative electrode pressing plate, and the positive / negative electrode connecting piece by riveting, thereby saving the time and cost of additional welding of the positive / negative electrode connecting piece.

[0005] To achieve the above-mentioned purpose, the present invention provides a riveted battery cover plate, characterized in that: it includes a top cover sheet, an explosion-proof valve and an explosion-proof valve protective cover, a first through hole is provided in the middle of the top cover sheet, a coaxial and equi-radially outwardly offset mounting layer hole is provided on the first through hole, the shape of the mounting layer hole is consistent with the shape of the explosion-proof valve, the explosion-proof valve is sleeved in the mounting layer hole, and the periphery is connected to the top cover sheet by a first laser weld, the first laser weld is provided on the front of the top cover sheet, and a coaxial and equi-radially outwardly offset mounting layer hole is provided on the upper plane of the top cover sheet at the periphery of the mounting layer hole. The annular groove is provided with an explosion-proof valve protection cover in the annular groove, the upper end of the explosion-proof valve protection cover is provided with a second through hole, the outer side wall of the lower end is provided with a flange extending outward, the flange and the outer side wall are in a rounded transition, the flange is connected to the top cover sheet by a second laser weld, the second laser weld is provided on the front of the top cover sheet, an explosion-proof valve protection patch is pasted on the upper plane of the explosion-proof valve protection cover, the explosion-proof valve protection patch can completely block the second through hole, and a first air vent is provided in the middle of the rear side of the upper end face of the explosion-proof valve protection cover to connect the second through hole with the outside world. The first air vent is used to exhaust when pasting the explosion-proof valve protection patch to make the pasting more firm.

[0006] The first and second laser welds are both located on the front side of the top cover sheet, which can effectively prevent the liquid electrolyte injected into the battery from corroding the welds, thereby improving the safety and service life of new energy batteries.

[0007] As a further improvement of the present technology, the explosion-proof valve includes a valve body and a fixed part arranged on the periphery of the valve body, the thickness of the fixed part is greater than the thickness of the valve body, the fixed part is sleeved in the hole of the mounting layer, the thickness is consistent with the depth of the hole of the mounting layer, and is set to 0.45~0.6mm, the thickness of the valve body is set to 0.15~0.23mm, and a notch is provided on the near outer edge of the valve body, the notch is provided in the first through hole, and the residual thickness at the notch is set to 0.045~0.075mm.

[0008] As a further improvement of the present technology, it also includes a negative pole, a negative upper plastic, a lower plastic, a negative pressure plate and a negative connecting sheet, the top cover sheet is provided with a third through hole on the left side, the third through hole is provided with a coaxial first square layer hole on the top, the negative upper plastic sleeve is arranged in the first square layer hole, the shape is consistent with the first square layer hole, a fourth through hole is arranged in the middle, a coaxial second square layer hole is arranged above the fourth through hole, the lower plastic is arranged under the top cover sheet, the upper plane is fitted with the lower plane of the top cover sheet, a fifth through hole is arranged on the left side of the lower plastic at a position corresponding to the third through hole, a coaxial third square layer hole is arranged below the fifth through hole, the negative pressure plate is arranged in the second square layer hole, the shape is consistent with the second square layer hole, and a sixth through hole is arranged in the middle, The front and rear sides of the lower end surface of the negative electrode pressing plate are both provided with first blocking bars extending downward, and a first slot is formed between the two first blocking bars. The negative electrode connecting piece is a Z-shaped bent plate with the left side lower than the right side. The left side of the negative electrode connecting piece is inserted into the first slot, and a seventh through hole is provided at the left side corresponding to the sixth through hole. The third through hole, the fourth through hole, the fifth through hole, the sixth through hole and the seventh through hole are coaxially connected; the negative electrode column includes a negative electrode flat plate portion and a negative electrode column portion, the negative electrode flat plate portion is sleeved in the second square layer hole, and the upper end surface is higher than the upper end surface of the plastic on the negative electrode, and the negative electrode column portion passes through the fourth through hole, the third through hole, the fifth through hole, the sixth through hole and the seventh through hole from top to bottom in sequence, and the end portion is fixedly connected to the negative electrode pressing plate by riveting; The negative electrode column is made of aluminum, and the negative electrode pressing plate and the negative electrode connecting piece are both made of T2 copper.

[0009] The present invention fixedly connects the negative pole column with the top cover sheet, the negative upper plastic, the lower plastic, the negative pressure plate and the negative connecting sheet by riveting, thus saving the time and cost of additional welding of the negative connecting sheet.

[0010] The negative poles on the existing cover plate assemblies are mostly copper-aluminum composited by friction welding, which has high processing costs and great processing difficulty, poor composite surface reliability, and the size of the pole base has a great influence on the composite surface strength. In the riveted connection structure of the present invention, a copper negative pole pressure plate is connected with an aluminum negative pole and a copper negative pole connecting piece, which saves the time and cost of the existing copper-aluminum composite process of the negative pole by friction welding.

[0011] As a further improvement of the present technology, it also includes a negative electrode sealing ring, which is sleeved on the outside of the negative electrode column, and is arranged between the inner wall of the third through hole, the inner wall of the fourth through hole, the inner wall of the fifth through hole and the lower end surface of the negative electrode flat plate, and the upper plane of the negative electrode pressing plate, to seal the negative electrode column with the top cover sheet, the negative electrode upper plastic, the lower plastic, and the negative electrode pressing plate.

[0012] As a further improvement of the present technology, the first square layer hole and the lower right corner of the negative electrode upper plastic are provided with a chamfer, and the third square layer hole and the upper right corner of the negative electrode pressing plate are provided with a chamfer; Due to the different requirements for the positive and negative resistors, the plastic materials used on the positive and negative electrodes are different. In order to distinguish the plastics on the positive and negative electrodes, the upper right corner chamfer is used to distinguish them; similarly, due to the different materials of the positive and negative pressure plates, the upper right corner chamfer is used to distinguish them.

[0013] The plastic on the negative electrode isolates the top cover sheet from the negative electrode column, so that the top cover sheet and the negative electrode column can achieve insulation or semi-conduction function.

[0014] The left and right sides of the front and rear plastic side walls on the negative electrode are both provided with first bosses extending outwards.

[0015] Here, the first boss is provided to reduce the contact area between the plastic on the negative electrode and the inner side wall of the first square layer hole of the top cover sheet, so as to facilitate assembly.

[0016] As a further improvement of the present technology, it also includes a positive electrode column, a positive electrode upper plastic, a positive electrode pressing plate and a positive electrode connecting plate, the top cover plate is provided with an eighth through hole on the right side, a coaxial fourth square layer hole is provided above the eighth through hole, the positive electrode upper plastic sleeve is arranged in the fourth square layer hole, the shape is consistent with the fourth square layer hole, a ninth through hole is arranged in the middle, a coaxial fifth square layer hole is arranged above the ninth through hole, a tenth through hole is arranged on the right side of the lower plastic at a position corresponding to the eighth through hole, a coaxial sixth square layer hole is arranged below the tenth through hole, the positive electrode pressing plate is arranged in the sixth square layer hole, the shape is consistent with the sixth square layer hole, an eleventh through hole is arranged in the middle, and a second baffle extending downward is provided on the front and rear sides of the lower end surface of the positive electrode pressing plate, and a second baffle extending downward is provided between the two second baffles A second slot is formed, the positive electrode connecting piece is a Z-shaped bent plate with a higher left side and a lower right side, the right side of the positive electrode connecting piece is inserted into the second slot, a twelfth through hole is provided at a position on the right side corresponding to the eleventh through hole, the eighth through hole, the ninth through hole, the tenth through hole, the eleventh through hole and the twelfth through hole are coaxially connected, an avoidance groove is provided on the left side of the positive electrode connecting piece for avoiding the circular boss on the lower plastic corresponding to the injection hole, the positive electrode column includes a positive plate portion and a positive column portion, the positive plate portion is sleeved in the fifth square layer hole, the upper end face is higher than the upper end face of the positive plastic, the positive column portion passes through the ninth through hole, the eighth through hole, the tenth through hole, the eleventh through hole and the twelfth through hole from top to bottom in sequence, and the end is fixedly connected to the positive electrode pressing plate by riveting; The positive electrode column, the positive electrode pressing plate and the positive electrode connecting piece are all made of aluminum.

[0017] As a further improvement of the present technology, it also includes a positive electrode sealing ring, which is sleeved on the outside of the positive electrode column, and is arranged between the inner side wall of the eighth through hole, the inner side wall of the ninth through hole, the inner side wall of the tenth through hole and the lower end surface of the positive flat plate part and the upper plane of the positive electrode pressing plate to seal the positive electrode column with the top cover sheet, the positive electrode upper plastic, the lower plastic, and the positive electrode pressing plate.

[0018] As a further improvement of the present technology, the fourth square layer hole and the lower left corner of the positive electrode upper plastic are provided with a chamfer, and the sixth square layer hole and the upper left corner of the positive electrode pressing plate are provided with a chamfer; Due to the different requirements for the positive and negative resistors, the plastic materials used on the positive and negative electrodes are different. In order to distinguish the plastics on the positive and negative electrodes, the lower left corner chamfer is used for distinction; similarly, due to the different materials of the positive and negative pressure plates, the upper left corner chamfer is used for distinction.

[0019] The plastic on the positive electrode isolates the top cover sheet from the positive electrode column, so that the top cover sheet and the positive electrode column can achieve insulation or semi-conduction function.

[0020] Second bosses extending outwards are arranged on the left and right sides of the front and rear side walls of the plastic on the positive electrode.

[0021] Here, the second boss is provided to reduce the contact area between the plastic on the positive electrode and the inner side wall of the fourth square layer hole of the top cover sheet, so as to facilitate assembly.

[0022] As a further improvement of the present technology, a first ventilation groove is provided in the middle of the front, rear, left and right sides of the plastic bottom surface of the negative electrode, which is connected to the fourth through hole and the outside world; A second venting groove is provided in the middle of the front, rear, left and right sides of the plastic bottom surface of the positive electrode, which is connected with the ninth through hole and the outside world; A second vent hole is provided between the bottom surface and the right side wall of the third rectangular layer hole, which is connected with the fifth through hole and the outside world; A third vent hole is provided between the bottom surface and the left side wall of the sixth square layer hole, connecting the tenth through hole with the outside.

[0023] The first ventilation groove, the second ventilation groove, the second ventilation port and the third ventilation port are provided for exhausting air during riveting assembly to improve the installation accuracy and connection tightness between the components.

[0024] As a further improvement of the present technology, four upwardly protruding buckles are provided in the middle of the lower plastic upper plane in a circumferentially evenly distributed manner, and the buckles include a first outer cylinder, a second outer cylinder and a third outer cylinder connected in sequence from top to bottom, and the diameter of the second outer cylinder is smaller than the diameters of the first outer cylinder and the third outer cylinder; buttonholes are provided at positions corresponding to the four buckles on the lower plane of the top cover plate, and the buttonholes include a first inner hole, a second inner hole and a third inner hole connected in sequence from top to bottom and respectively engaged with the first outer cylinder, the second outer cylinder and the third outer cylinder, and the buckles and buttonholes are fixedly connected by buckling through a hot melt process.

[0025] Before the lower plastic and the top cover are assembled, the buckle position is injection molded into a cylindrical protrusion. During assembly, the cylindrical protrusion is deformed by the hot melt process and melts into the buttonhole on the top cover to form a matching buckle, which fixes the lower plastic and the top cover to facilitate subsequent riveting connection.

[0026] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention arranges the explosion-proof valve in the installation layer hole of the top cover sheet, so that the first laser weld between the explosion-proof valve and the top cover sheet is arranged on the front of the top cover sheet, an explosion-proof valve protective cover is arranged on the outside of the explosion-proof valve, and the second laser weld between the explosion-proof valve protective cover and the top cover sheet is also arranged on the front of the top cover sheet, which can effectively prevent the liquid electrolyte injected into the battery from corroding the weld, thereby improving the safety and service life of the new energy battery; 2. The present invention adopts riveting to fix the positive / negative poles with the top cover sheet, positive / negative upper plastic, lower plastic, positive / negative pressure plate, and positive / negative connecting piece, saving the time and cost of additional welding of the positive / negative connecting piece. At the same time, the copper negative pressure plate is connected with the aluminum negative pole and the copper negative connecting piece, saving the time and cost of the existing copper-aluminum composite process of the negative pole using friction welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure before riveting of an embodiment of the present invention; Figure 3 This is a schematic diagram of the explosion structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure after riveting of an embodiment of the present invention; Figure 5 This is a schematic diagram of the reverse structure of the top cover sheet according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the plastic back structure of an embodiment of the present invention; Figure 7 This is a schematic diagram of the reverse side structure of the plastic on the negative electrode of an embodiment of the present invention; Figure 8 Schematic diagram of the reverse structure of the plastic on the positive electrode of an embodiment of the present invention.

[0028] Fig. 9 This is a schematic diagram of the reverse structure of the negative electrode pressing plate according to an embodiment of the present invention; Fig.10 This is a schematic diagram of the back structure of the positive electrode pressure plate according to an embodiment of the present invention; Fig.11 for Figure 3 Enlarged view of point A in the middle; Fig.12 for Figure 5 Enlarged view of point B in the middle; Fig.13 This is a schematic diagram of the buckle position structure before assembly of the lower plastic and the top cover sheet according to an embodiment of the present invention.

[0029] In the figure: 1, top cover plate, 101, first through hole, 102, mounting layer hole, 103, annular groove, 104, third through hole, 105, first square layer hole, 106, eighth through hole, 107, fourth square layer hole, 108, injection boss, 109, injection hole, 110, conical groove, 111, button hole, 1111, first inner hole, 1112, second inner hole, 1113, third inner hole, 2, lower plastic, 201, fifth through hole, 202, third square layer hole, 203 , tenth through hole, 204, sixth square layer hole, 205, buckle, 2051, first outer cylinder, 2052, second outer cylinder, 2053, third outer cylinder, 205', cylindrical protrusion, 206, second vent, 207, third vent, 3, negative pole, 301, negative plate portion, 302, negative pole column portion, 4, negative upper plastic, 401, fourth through hole, 402, second square layer hole, 403, first boss, 404, first vent groove, 5, negative pole sealing ring, 6. Negative electrode pressing plate, 601. Sixth through hole, 602. First stop bar, 7. Negative electrode connecting piece, 701. Seventh through hole, 8. Positive electrode column, 801. Positive electrode flat plate, 802. Positive electrode column, 9. Positive electrode upper plastic, 901. Ninth through hole, 902. Fourth square layer hole, 903. Third boss, 904. Second air permeable groove, 10. Positive electrode sealing ring, 11. Positive electrode pressing plate, 1101. Eleventh through hole , 1102, second baffle, 12, positive electrode connecting plate, 1201, twelfth through hole, 1202, avoidance groove, 13, explosion-proof valve, 1301, valve body, 1302, fixing part, 1303, notch, 14, explosion-proof valve protection cover, 1401, second through hole, 1402, flange, 1403, first air vent, 15, explosion-proof valve protection patch, 16, first laser weld, 17, second laser weld. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. like Figures 1 to 4 As shown, the embodiment of the present invention includes a top cover sheet 1, an explosion-proof valve 13 and an explosion-proof valve protective cover 14. A first through hole 101 is provided in the middle of the top cover sheet 1. A coaxial and equiradially outwardly offset mounting layer hole 102 is provided on the first through hole 101. The mounting layer hole 102 has a shape consistent with the shape of the explosion-proof valve 13. The explosion-proof valve 13 is sleeved in the mounting layer hole 102. The periphery is connected to the top cover sheet 1 through a first laser weld 16. The first laser weld 61 is provided on the front of the top cover sheet 1. A coaxial and equiradially outwardly offset annular groove 103 is provided on the upper plane of the top cover sheet 1 at the periphery of the mounting layer hole 102. The inner sleeve of the annular groove 103 An explosion-proof valve protection cover 14 is provided, a second through hole 1401 is provided at the upper end of the explosion-proof valve protection cover 14, a flange 1402 extending outward is provided on the outer side wall of the lower end, the flange 1402 transitions with the rounded corner of the outer side wall, the flange 1402 is connected to the top cover sheet 1 through a second laser weld 17, and the second laser weld 17 is provided on the front of the top cover sheet 1, an explosion-proof valve protection patch 15 is pasted on the upper plane of the explosion-proof valve protection cover 14, and the explosion-proof valve protection patch 15 can completely block the second through hole 1401, and a first air vent 1403 connecting the second through hole 1401 and the outside is provided in the middle of the rear side of the upper end surface of the explosion-proof valve protection cover 14. The first air vent 1403 is used to exhaust when pasting the explosion-proof valve protection patch 15, so that the pasting is more firm.

[0032] The explosion-proof valve protection patch 15 is only used to prevent the electrolyte from splashing into the explosion-proof valve protection cover 14 when the battery is injected with electrolyte. After the injection is completed, the explosion-proof valve protection patch 15 needs to be removed.

[0033] In this embodiment, a downwardly extending boss 108 is provided on the lower plane of the top cover sheet 1 on the right side of the explosion-proof valve 13, and a liquid injection hole 109 is provided on the top cover sheet 1 at a position corresponding to the boss 108. A coaxial conical expansion hole 110 is provided above the liquid injection hole 109 to facilitate liquid injection.

[0034] In this embodiment, the first laser weld 16 and the second laser weld 17 are both arranged on the front side of the top cover sheet 1, which can effectively prevent the liquid electrolyte injected into the battery from corroding the welds, thereby improving the safety and service life of the new energy battery.

[0035] The explosion-proof valve 13 includes a valve body 1301 and a fixing portion 1302 arranged on the periphery of the valve body 1301. The thickness of the fixing portion 1302 is greater than that of the valve body 1301. The fixing portion 1301 is sleeved in the mounting layer hole 102. The thickness is consistent with the depth of the mounting layer hole 102 and is set to 0.45-0.6 mm. The thickness of the valve body 1301 is set to 0.15-0.23 mm. A notch 1303 is provided near the outer edge of the valve body 1301. The notch 1303 is arranged on the inner side of the first through hole 101. The residual thickness at the notch 1301 is set to 0.045-0.075 mm.

[0036] As a preference, Figures 1 to 12As shown, this embodiment also includes a negative electrode column 3, a negative electrode upper plastic 4, a lower plastic 2, a negative electrode pressing plate 6 and a negative electrode connecting plate 7. A third through hole 104 is provided on the left side of the top cover sheet 1, and a coaxial first square layer hole 105 is provided on the third through hole 104. The negative electrode upper plastic 4 is sleeved in the first square layer hole 105, and its appearance is consistent with the first square layer hole 105. A fourth through hole 401 is provided in the middle, and a coaxial second square layer hole 402 is provided on the fourth through hole 401. The lower plastic 2 is provided under the top cover sheet 1, and its upper plane is in contact with the lower plane of the top cover sheet 1. A fifth through hole 201 is provided on the left side of the lower plastic 2 at a position corresponding to the third through hole 104, and a coaxial third square layer hole 202 is provided below the fifth through hole 201. The negative electrode pressing plate 6 is provided in the second square layer hole 202, and its appearance is consistent with the second square layer hole 202. A sixth through hole 601 is provided in the middle, and the lower end of the negative electrode pressing plate 6 The front and rear sides of the surface are both provided with a first baffle 602 extending downward, and a first slot is formed between the two first baffles 602. The negative electrode connecting piece 7 is a Z-shaped bent plate with the left side lower than the right side. The left side of the negative electrode connecting piece 7 is inserted into the first slot, and a seventh through hole 701 is provided at the left side corresponding to the sixth through hole 601. The third through hole 104, the fourth through hole 401, the fifth through hole 201, the sixth through hole 601 and the seventh through hole 701 are coaxially connected; the negative electrode column 3 includes a negative electrode flat plate portion 301 and a negative electrode column portion 302, the negative electrode flat plate portion 301 is sleeved in the second square layer hole 105, and the upper end surface is higher than the upper end surface of the negative electrode upper plastic 4, and the negative electrode column portion 302 passes through the fourth through hole 401, the third through hole 104, the fifth through hole 201, the sixth through hole 601 and the seventh through hole 701 from top to bottom in sequence, and the end is fixedly connected to the negative electrode pressing plate 6 by riveting; The negative electrode column 3 is made of aluminum, and the negative electrode pressing plate 6 and the negative electrode connecting piece 7 are both made of T2 copper.

[0037] In this embodiment, the negative electrode column 3 is fixedly connected to the top cover sheet 1, the negative upper plastic 4, the lower plastic 2, the negative electrode pressing plate 6, and the negative electrode connecting sheet 7 by riveting, which saves the time and cost of additional welding of the negative electrode connecting sheet 7.

[0038] The negative pole 3 on the existing cover plate assembly is mostly copper-aluminum composited by friction welding, which has high processing cost and difficulty, poor composite surface reliability, and the size of the pole base has a great influence on the composite surface strength. In the riveted connection structure of this embodiment, a copper negative pole pressing plate 6 is connected to the aluminum negative pole 3 and the copper negative pole connecting piece 7, which saves the time and cost of the existing copper-aluminum composite process of the negative pole by friction welding.

[0039] Preferably, a negative electrode sealing ring 5 is further included, which is sleeved on the outside of the negative electrode column portion 302, and is arranged between the inner wall of the third through hole 104, the inner wall of the fourth through hole 401, the inner wall of the fifth through hole 201 and the lower end surface of the negative electrode flat plate portion 301, and the upper plane of the negative electrode pressing plate 6, so as to seal the negative electrode column 3 with the top cover sheet 1, the negative electrode upper plastic 4, the lower plastic 2, and the negative electrode pressing plate 6.

[0040] Preferably, the first square layer hole 105 and the lower right corner of the negative electrode upper plastic 4 are chamfered; the third square layer hole 202 and the upper right corner of the negative electrode pressing plate 6 are chamfered; Due to the different requirements for positive and negative electrode resistance, the plastic materials used for the positive electrode plastic 9 and the negative electrode plastic 4 are different. In order to distinguish the positive electrode plastic 9 and the negative electrode plastic 4, the upper right corner chamfer is used to distinguish them; similarly, due to the different materials of the positive electrode pressure plate 11 and the negative electrode pressure plate 6, the upper right corner chamfer is used to distinguish them.

[0041] The plastic 4 on the negative electrode isolates the top cover sheet 1 from the negative electrode column 3 , so that the top cover sheet 1 and the negative electrode column 3 can achieve insulation or semi-conduction function.

[0042] The left and right sides of the front and rear side walls of the negative electrode upper plastic 4 are both provided with first bosses 403 extending outwards.

[0043] Here, the first boss 403 is provided to reduce the contact area between the plastic 4 on the negative electrode and the inner wall of the first square layer hole 105 of the top cover sheet 1 to facilitate assembly.

[0044] Preferably, the present embodiment further comprises a positive electrode column 8, a positive electrode upper plastic 9, a positive electrode pressing plate 11 and a positive electrode connecting sheet 12, an eighth through hole 106 is provided on the right side of the top cover sheet 1, a coaxial fourth square layer hole 107 is provided above the eighth through hole 106, the positive electrode upper plastic 9 is sleeved in the fourth square layer hole 107, the shape is consistent with the fourth square layer hole 107, a ninth through hole 901 is provided in the middle, a coaxial fifth square layer hole 902 is provided above the ninth through hole 901, a tenth through hole 203 is provided on the right side of the lower plastic 2 at a position corresponding to the eighth through hole 106, a coaxial sixth square layer hole 204 is provided below the tenth through hole 203, the positive electrode pressing plate 11 is provided in the sixth square layer hole 204, the shape is consistent with the sixth square layer hole 204, an eleventh through hole 1101 is provided in the middle, and a second baffle 1102 extending downward is provided on the front and rear sides of the lower end surface of the positive electrode pressing plate 11, and a second slot is formed between the two second baffles 1102. The positive electrode connecting piece 12 is a Z-shaped bent plate with a high left side and a low right side. The right side of the positive electrode connecting piece 12 is inserted into the second slot. A twelfth through hole 1201 is provided at a position on the right side corresponding to the eleventh through hole 1101. The eighth through hole 106, the ninth through hole 901, the tenth through hole 203, the eleventh through hole 1101 and the twelfth through hole 1201 are coaxially connected. An avoidance groove 1202 is provided on the left side of the positive electrode connecting piece 12 to avoid the plastic 2 on the lower side and the injection hole 10 9 corresponding circular boss, the positive electrode column 8 includes a positive plate portion 801 and a positive column portion 802, the positive plate portion 801 is sleeved in the fifth square layer hole 902, the upper end surface is higher than the upper end surface of the positive upper plastic 9, the positive column portion 802 passes through the ninth through hole 901, the eighth through hole 106, the tenth through hole 203, the eleventh through hole 1101 and the twelfth through hole 1201 from top to bottom, and the end is fixedly connected to the positive platen 11 by riveting; The positive electrode column 8, the positive electrode pressing plate 11 and the positive electrode connecting piece 12 are all made of 1060 aluminum.

[0045] Preferably, the present embodiment further includes a positive electrode sealing ring 10, which is sleeved on the outside of the positive electrode column portion 802, and is arranged between the inner wall of the eighth through hole 203, the inner wall of the ninth through hole 901, the inner wall of the tenth through hole 203 and the lower end surface of the positive flat plate portion 801, and the upper plane of the positive electrode pressing plate 11, so as to seal the positive electrode column 8 with the top cover sheet 1, the positive upper plastic 9, the lower plastic 2, and the positive pressing plate 11.

[0046] Preferably, the fourth square layer hole 107 and the lower left corner of the positive electrode upper plastic 9 are chamfered; the chamfer is used to distinguish the positive electrode upper plastic 9 from the negative electrode upper plastic 4.

[0047] The sixth square layer hole 204 and the upper left corner of the positive electrode pressing plate 11 are chamfered; the chamfer is used to distinguish the positive electrode pressing plate 11 from the negative electrode pressing plate 6.

[0048] The plastic 9 on the positive electrode isolates the top cover sheet 1 from the positive electrode column 8, so that the top cover sheet 1 and the positive electrode column 8 can achieve insulation or semi-conduction function.

[0049] Second bosses 903 extending outwards are provided on the left and right sides of the front and rear side walls of the positive electrode upper plastic 9 .

[0050] Here, the second boss 903 is provided to reduce the contact area between the plastic 9 on the positive electrode and the inner wall of the fourth square layer hole 107 of the top cover sheet 1 to facilitate assembly.

[0051] Preferably, in this embodiment, first ventilation grooves 404 are provided in the middle of the front, rear, left and right sides of the bottom surface of the negative electrode upper plastic 4 to connect the fourth through hole 401 with the outside; Second ventilation grooves 904 are provided in the middle of the front, rear, left and right sides of the bottom surface of the positive electrode plastic 9, which are connected to the ninth through hole 901 and the outside world; A second vent 206 is provided between the bottom surface and the right side wall of the third square layer hole 202, which is connected to the fifth through hole 201 and the outside. A third vent 207 is provided between the bottom surface and the left side wall of the sixth square layer hole 204 to connect the tenth through hole 203 with the outside.

[0052] The first ventilation groove 404, the second ventilation groove 904, the second ventilation port 206, and the third ventilation port 207 are provided for exhausting air during riveting assembly to improve the installation accuracy and connection tightness between the components.

[0053] Preferably, in this embodiment, four upwardly protruding buckles 205 are evenly distributed in a circle in the middle of the upper plane of the lower plastic 2, and the buckle 205 includes a first outer cylinder 2051, a second outer cylinder 2052 and a third outer cylinder 2053 connected in sequence from top to bottom, and the diameter of the second outer cylinder 2052 is smaller than the diameters of the first outer cylinder 2051 and the third outer cylinder 2053; button holes 111 are provided at positions corresponding to the four buckles 205 on the lower plane of the top cover plate 1, and the button holes 111 include a first inner hole 1111, a second inner hole 1112 and a third inner hole 1113 which are connected in sequence from top to bottom and respectively cooperate with the first outer cylinder 2051, the second outer cylinder 2052 and the third outer cylinder 2053, and the buckle 205 and the button hole 111 are fixedly connected by a hot melt process.

[0054] like Fig.13 As shown, before the lower plastic 2 is assembled with the top cover piece 1, the buckle 205 position is injection molded into a cylindrical protrusion 205'. During assembly, the cylindrical protrusion 205' is deformed by a hot melt process and melts into the button hole 111 on the top cover piece 1 to form a matching buckle 205, thereby fixing the lower plastic 2 with the top cover piece 1 and facilitating subsequent riveting connection.

[0055] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A riveted battery cover, characterized in that: The utility model comprises a top cover sheet, an explosion-proof valve and an explosion-proof valve protection cover, wherein a first through hole is provided in the middle of the top cover sheet, a mounting layer hole which is coaxial and equiradially outwardly offset is provided on the first through hole, the shape of the mounting layer hole is consistent with the shape of the explosion-proof valve, the explosion-proof valve sleeve is arranged in the mounting layer hole, and the periphery is connected to the top cover sheet by a first laser weld, the first laser weld is arranged on the front of the top cover sheet, an annular groove which is coaxial and equiradially outwardly offset is provided on the plane above the top cover sheet at the periphery of the mounting layer hole, an explosion-proof valve protection cover is sleeved in the annular groove, a second through hole is provided at the upper end of the explosion-proof valve protection cover, a flange extending outward is provided on the outer side wall of the lower end, the flange and the outer side wall have a rounded transition, the flange is connected to the top cover sheet by a second laser weld, the second laser weld is arranged on the front of the top cover sheet, an explosion-proof valve protection patch is pasted on the upper plane of the explosion-proof valve protection cover, the explosion-proof valve protection patch can completely block the second through hole, and a first air vent which connects the second through hole with the outside is provided in the middle of the rear side of the upper end face of the explosion-proof valve protection cover.

2. The riveted battery cover according to claim 1, characterized in that: The explosion-proof valve includes a valve body and a fixed part arranged on the periphery of the valve body, the thickness of the fixed part is greater than the thickness of the valve body, the fixed part is sleeved in the hole of the mounting layer, the thickness is consistent with the depth of the hole of the mounting layer, and is set to 0.45-0.6mm, the thickness of the valve body is set to 0.15-0.23mm, and a notch is provided on the near outer edge of the valve body, the notch is arranged in the first through hole, and the residual thickness at the notch is set to 0.045-0.075mm.

3. The riveted battery cover according to claim 1, characterized in that: It also includes a negative pole, a negative upper plastic, a lower plastic, a negative pressure plate and a negative connecting plate, the top cover sheet is provided with a third through hole on the left side, the third through hole is provided with a coaxial first square layer hole above, the negative upper plastic sleeve is arranged in the first square layer hole, the shape is consistent with the first square layer hole, a fourth through hole is arranged in the middle, a coaxial second square layer hole is arranged above the fourth through hole, the lower plastic is arranged under the top cover sheet, the upper plane is fitted with the lower plane of the top cover sheet, a fifth through hole is arranged at a position corresponding to the third through hole on the left side of the lower plastic, a coaxial third square layer hole is arranged below the fifth through hole, the negative pressure plate is arranged in the second square layer hole, the shape is consistent with the second square layer hole, a sixth through hole is arranged in the middle, the negative pressure plate The front and rear sides of the lower end surface are both provided with first baffles extending downward, and a first slot is formed between the two first baffles. The negative electrode connecting piece is a Z-shaped bent plate with the left side lower than the right side. The left side of the negative electrode connecting piece is inserted into the first slot, and a seventh through hole is provided at the left side corresponding to the sixth through hole. The third through hole, the fourth through hole, the fifth through hole, the sixth through hole and the seventh through hole are coaxially connected; the negative electrode column includes a negative electrode flat plate portion and a negative electrode column portion, the negative electrode flat plate portion is sleeved in the second square layer hole, and the upper end surface is higher than the upper end surface of the plastic on the negative electrode, and the negative electrode column portion passes through the fourth through hole, the third through hole, the fifth through hole, the sixth through hole and the seventh through hole from top to bottom in sequence, and the end portion is fixedly connected to the negative electrode pressing plate by riveting; The negative electrode column is made of aluminum, and the negative electrode pressing plate and the negative electrode connecting piece are both made of T2 copper.

4. The riveted battery cover according to claim 3, characterized in that: It also includes a negative electrode sealing ring, which is sleeved on the outside of the negative electrode column, and is arranged between the inner wall of the third through hole, the inner wall of the fourth through hole, the inner wall of the fifth through hole and the lower end surface of the negative electrode flat plate, and the upper plane of the negative electrode pressing plate to seal the negative electrode column with the top cover sheet, the negative electrode upper plastic, the lower plastic, and the negative electrode pressing plate.

5. The riveted battery cover according to claim 3, characterized in that: The first square layer hole and the lower right corner of the negative electrode upper plastic are chamfered, and the third square layer hole and the upper right corner of the negative electrode pressing plate are chamfered; The left and right sides of the front and rear plastic side walls on the negative electrode are both provided with first bosses extending outwards.

6. The riveted battery cover according to claim 3, characterized in that: It also includes a positive electrode column, a positive electrode upper plastic, a positive electrode pressing plate and a positive electrode connecting sheet, the top cover sheet is provided with an eighth through hole on the right side, a coaxial fourth square layer hole is provided above the eighth through hole, the positive electrode upper plastic sleeve is arranged in the fourth square layer hole, the shape is consistent with the fourth square layer hole, a ninth through hole is provided in the middle, a coaxial fifth square layer hole is provided above the ninth through hole, a tenth through hole is provided on the right side of the lower plastic at a position corresponding to the eighth through hole, a coaxial sixth square layer hole is provided below the tenth through hole, the positive electrode pressing plate is provided in the sixth square layer hole, the shape is consistent with the sixth square layer hole, an eleventh through hole is provided in the middle, and a second baffle extending downward is provided on the front and rear sides of the lower end surface of the positive electrode pressing plate, and the two second A second slot is formed between the baffle bars, the positive electrode connecting piece is a Z-shaped bent plate with a higher left side and a lower right side, the right side of the positive electrode connecting piece is inserted into the second slot, a twelfth through hole is provided at the right side corresponding to the eleventh through hole, the eighth through hole, the ninth through hole, the tenth through hole, the eleventh through hole and the twelfth through hole are coaxially connected, an avoidance groove is provided on the left side of the positive electrode connecting piece, the positive electrode column includes a positive plate portion and a positive electrode column portion, the positive electrode plate portion is sleeved in the fifth square layer hole, the upper end face is higher than the upper end face of the plastic on the positive electrode, the positive electrode column portion passes through the ninth through hole, the eighth through hole, the tenth through hole, the eleventh through hole and the twelfth through hole from top to bottom in sequence, and the end is fixedly connected to the positive electrode pressing plate by riveting; The positive electrode column, the positive electrode pressing plate and the positive electrode connecting piece are all made of aluminum.

7. The riveted battery cover according to claim 6, characterized in that: It also includes a positive electrode sealing ring, which is sleeved on the outside of the positive electrode column, and is arranged between the inner side wall of the eighth through hole, the inner side wall of the ninth through hole, the inner side wall of the tenth through hole and the lower end surface of the positive plate part and the upper plane of the positive electrode pressing plate to seal the positive electrode column with the top cover sheet, the positive electrode upper plastic, the lower plastic, and the positive electrode pressing plate.

8. The riveted battery cover according to claim 6, characterized in that: The fourth square layer hole and the lower left corner of the positive electrode plastic are chamfered, and the sixth square layer hole and the upper left corner of the positive electrode pressing plate are chamfered; Second bosses extending outwards are arranged on the left and right sides of the front and rear side walls of the plastic on the positive electrode.

9. The riveted battery cover according to claim 6, characterized in that: The plastic bottom surface of the negative electrode is provided with a first venting groove in the middle of the front, rear, left and right sides, which is connected with the fourth through hole and the outside world; A second venting groove is provided in the middle of the front, rear, left and right sides of the plastic bottom surface of the positive electrode, which is connected with the ninth through hole and the outside world; A second vent hole is provided between the bottom surface and the right side wall of the third rectangular layer hole, which is connected with the fifth through hole and the outside world; A third vent hole is provided between the bottom surface and the left side wall of the sixth square layer hole, connecting the tenth through hole with the outside.

10. The riveted battery cover according to claim 3, characterized in that: Four upwardly protruding buckles are evenly distributed in a circle in the middle of the upper plane of the lower plastic, and the buckles include a first outer cylinder, a second outer cylinder and a third outer cylinder connected in sequence from top to bottom, and the diameter of the second outer cylinder is smaller than the diameters of the first outer cylinder and the third outer cylinder; buttonholes are provided at positions corresponding to the four buckles on the lower plane of the top cover plate, and the buttonholes include a first inner hole, a second inner hole and a third inner hole connected in sequence from top to bottom and respectively matched and buckled with the first outer cylinder, the second outer cylinder and the third outer cylinder, and the buckles and buttonholes are fixedly connected by buckling through a hot melt process.

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