Top cover assembly, battery, energy storage device and electric equipment

Abstract

The invention discloses a top cover assembly, a battery, an energy storage device and electric equipment, the top cover assembly comprises a top cover, and the top cover is provided with a first through hole; the polar column comprises a bottom plate and a first column body, the bottom plate and the top cover are arranged at an interval, the first column body is connected with the bottom plate, and the first column body extends into the first through hole; the flow collecting disc is arranged on the side, away from the top cover, of the bottom plate, the flow collecting disc and the bottom plate are arranged in a stacked mode, the flow collecting disc comprises a flat plate and a boss, and the boss protrudes out of the surface, facing the bottom plate, of the flat plate and is welded to the bottom plate. The battery comprises a top cover assembly and a battery cell, wherein the top cover assembly is arranged at a negative electrode of the battery cell. The energy storage device comprises the battery provided by the application, and the electric equipment comprises the energy storage device provided by the application. According to the top cover assembly, single-pole folding collector plate penetration welding is changed into bottom plate and collector plate penetration welding, the top cover assembly is optimized, the problem that the collector plates are difficult to center is effectively solved, the torsion resistance of the top cover assembly is improved, and the product production rate is increased.

Description

Technical Field

[0001] The present application relates to the field of secondary batteries, and in particular to a top cover assembly, a battery, an energy storage device and an electrical equipment. Background Art

[0002] The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their energy density, reliability and cost. In particular, the top cover, as a key structural part of the battery cell, plays a vital role in the safety of the battery cell. At present, the negative electrode of the cylindrical battery structure adopts a folding collector plate solution. When assembling the folding collector plate into the battery shell, it is difficult to ensure its correct positioning, and it is easy to have the problem of difficulty in centering the folding collector plate when it is inserted into the shell. Summary of the invention

[0003] The present application provides a top cover assembly, a battery, an energy storage device and an electrical equipment, which solve the problem that the current collecting plate of the cylindrical negative electrode of the battery is difficult to center during production and installation.

[0004] In the first aspect, the present application provides a top cover assembly, including a top cover, provided with a first through hole; a pole, including a bottom plate and a first column, the bottom plate and the top cover are spaced apart, the first column is connected to the bottom plate, and the first column extends into the first through hole; a current collecting plate, provided on the side of the bottom plate away from the top cover, the current collecting plate and the bottom plate are stacked, the current collecting plate includes a flat plate and a boss, the boss protrudes from the surface of the flat plate facing the bottom plate, and the boss is welded to the bottom plate. The present application adjusts the folded current collecting plate to a planar structure, and sets a boss in the middle of the current collecting plate, and the boss is used to be welded to the bottom plate of the pole. When the welded top cover assembly is placed in the battery housing, the planar current collecting plate has a simple structure and the placement process is easy to control, which avoids the problem of difficult centering of the current collecting plate, and the current collecting plate occupies less internal space of the battery, saves the internal space of the battery cell, and improves the energy density of the battery cell.

[0005] In a feasible implementation, the top cover is provided with a second through hole spaced apart from the first through hole, and the pole also includes a second column, the first column and the second column are both connected to the surface of the bottom plate facing the top cover, and the second column extends into the second through hole. Considering that in the actual production process of the pole, the production and processing of the one-piece structure is relatively simple, which helps to improve product productivity, the present application designs the first column and the second column to be arranged on the side of the bottom plate facing the top cover to form a pole of an one-piece structure. When the top cover assembly is assembled, the first column and the second column on the bottom plate cooperate with each other to disperse the torque and improve the torsional resistance of the top cover assembly.

[0006] In a feasible implementation, a first groove is provided on the surface of the bottom plate facing the top cover, and a first sealing ring is provided in the first groove, and the first sealing ring is in close contact with the bottom plate and the top cover. The first groove provided on the bottom plate is used to provide space for positioning components and subsequent welding operations, and a first sealing ring in close contact with the bottom plate and the top cover is provided in the first groove to prevent other components from moving and interfering with the welding. In addition, since the first sealing ring increases the contact area between the top cover and the bottom plate, the heat generated during welding is transferred through the first sealing ring, which prolongs the heat transfer path during welding of the collector plate, thereby ensuring the sealing of the top cover and preventing other components from being burned.

[0007] In a feasible implementation, the first groove is located between the first column and the second column. Since the first groove is arranged between the first column and the second column, the welding position of the top cover assembly and the current collecting plate can be ensured to be centered when welding. After the first column and the second column are respectively inserted into the first through hole and the second through hole of the top cover for assembly, the first groove is simultaneously located in the middle position of the bottom plate and the top cover, and the projection direction of the first groove in the thickness direction of the current collecting plate is also located in the middle of the current collecting plate, so as to ensure that the bottom plate and the current collecting plate are centered when welding.

[0008] In a feasible implementation, the top cover further includes a third through hole, the third through hole is located between the first through hole and the second through hole, and the projection of the third through hole along the thickness direction of the top cover assembly overlaps with the first groove. The third through hole provided on the top cover is used for the welding equipment to extend into the top cover assembly and perform welding operation at the first groove, and the projection of the third through hole along the thickness direction of the top cover assembly overlaps with the first groove, so that the welding equipment can reach the first groove in a shorter time and weld the bottom plate and the current collecting plate, and at the same time, the projection of the third through hole along the thickness direction of the top cover assembly overlaps with the first groove, which also avoids the misalignment problem when welding the bottom plate and the current collecting plate.

[0009] In a feasible implementation, the bottom wall of the first groove is provided with a second groove for welding with the current collecting plate. The second groove is arranged on the bottom wall of the first groove, located in the middle of the first groove, and the second groove is the main welding position for penetration welding between the bottom plate and the current collecting plate. After the welding equipment extends from the third through hole into the top cover assembly to the first groove, the bottom plate and the current collecting plate are penetrated and welded at the second groove. The operation is simple, the welding time is saved, and the product production efficiency is improved.

[0010] In a feasible implementation, the distance between the bottom wall of the second groove and the surface of the bottom plate facing away from the top cover is greater than 0 mm and less than or equal to 0.5 mm.

[0011] The second groove is the main welding position between the bottom plate and the collector plate. The distance between the bottom wall of the second groove and the surface of the bottom plate facing away from the top cover is greater than 0mm and less than or equal to 0.5mm. The thickness is relatively thin, which is convenient for penetration welding between the bottom plate and the collector plate. The operation is simple, saving welding time and improving product production efficiency.

[0012] In a feasible implementation, the top cover assembly further includes a second sealing ring and a third sealing ring; the second sealing ring is sleeved on the first column, and the second sealing ring is located between the bottom plate and the top cover; the third sealing ring is sleeved on the second column, and the third sealing ring is located between the bottom plate and the top cover. The inner wall of the second sealing ring is tightly fitted with the first column, the inner wall of the third sealing ring is tightly fitted with the second column, and the contact surfaces of the second sealing ring and the third sealing ring with the top cover and the bottom plate are flat and smooth, ensuring the seal between the top cover and the bottom plate.

[0013] In a feasible implementation, the top cover assembly further includes an upper plastic and a pressing block, wherein the upper plastic is located on the side of the top cover facing away from the bottom plate, and the pressing block is located on the side of the upper plastic facing away from the top cover. The upper plastic and the pressing block are stacked and arranged on the side of the top cover facing away from the bottom plate, and the upper plastic and the pressing block cooperate to press and assemble the top cover assembly to prevent the top cover and the pole from shifting. There is also an anti-fool design between the upper plastic and the pressing block to facilitate the positioning of the upper plastic and the pressing block to avoid deviation during assembly.

[0014] In a feasible implementation, the pressing block is provided with a fourth through hole, a fifth through hole and a sixth through hole, the fourth through hole is used for the first column to pass through, the fifth through hole is used for the second column to pass through; the projection of the sixth through hole along the thickness direction of the top cover assembly overlaps with the first groove. The fourth through hole, the fifth through hole and the sixth through hole provided in the pressing block correspond to the first through hole, the second through hole and the third through hole on the top cover respectively. The projection of the fourth through hole in the thickness direction of the top cover assembly overlaps with the first through hole of the top cover, the projection of the fifth through hole in the thickness direction of the top cover assembly overlaps with the second through hole of the top cover, and the projection of the sixth through hole in the thickness direction of the top cover assembly overlaps with the first groove. The pressing block is provided on the side of the top cover facing away from the bottom plate, the first column passes through the first through hole and the fourth through hole in sequence, the second column passes through the second through hole and the fifth through hole in sequence, the first column and the second column extend into the fourth through hole and the fifth through hole respectively to cooperate and press the top cover, and the sixth through hole is provided for the welding equipment to extend into, so that the welding equipment performs penetration welding at the second groove in the first groove.

[0015] In a feasible implementation, the fourth through hole and the fifth through hole are arranged at intervals along the length direction of the pressing block, and the first expansion area and the second expansion area are respectively convexly provided on both sides of the pressing block along the width direction, and the sixth through hole is located between the fourth through hole and the fifth through hole, and the sixth through hole is located between the first expansion area and the second expansion area; the diameter of the sixth through hole is greater than the diameter of the fourth through hole, and the diameter of the sixth through hole is greater than the diameter of the fifth through hole. Since the diameter of the sixth through hole is greater than the fourth through hole and the fifth through hole, and the sixth through hole is located in the middle position of the fourth through hole and the fifth through hole, in order to adapt to the outer contour of the sixth through hole, the pressing block is provided with the first expansion area and the second expansion area convexly provided along the width direction. When the welding equipment extends into the sixth through hole for penetration welding, the enlarged diameter of the sixth through hole and its expansion area provide ample operating space for the welding equipment, and the first expansion area and the second expansion area increase the heat transfer area during welding, which is helpful for heat dissipation and improves the flow and welding strength.

[0016] In a feasible implementation, the top cover assembly also includes a lower plastic, which is stacked on the surface of the bottom plate facing the top cover; the lower plastic is provided with a seventh through hole for the first column, the second column and the first groove to pass through. The lower plastic is provided on the surface of the bottom plate facing the top cover for positioning the pole. In order to prevent the lower plastic from falling off and to facilitate the passage of the first column and the second column, and also to facilitate the welding operation of the welding equipment at the first groove, the lower plastic is provided with a seventh through hole for the first column, the second column and the first groove to pass through. The inner wall of the seventh through hole fits with the first sealing ring, the second sealing ring and the third sealing ring, and is used to position the pole to avoid deviation during assembly.

[0017] In a feasible implementation, a positioning column is provided on the side of the lower plastic facing away from the bottom plate, and a positioning hole is provided on the side of the top cover facing the bottom plate, and the positioning column cooperates with the positioning hole to position the pole. The main function of the lower plastic is to position the pole. The seventh through hole on the lower plastic ensures that the lower plastic and the pole are aligned. The positioning column on the lower plastic and the positioning hole provided on the top cover cooperate with each other to position the lower plastic and the top cover to prevent deviation. At the same time, the positions of the lower plastic, the pole, the first sealing ring, the second sealing ring, the third sealing ring and the top cover are further fixed to prevent these components from being misaligned during the welding operation and improve the positioning accuracy.

[0018] In a second aspect, the present application further provides a battery, comprising the top cover assembly and a battery cell as described in the first aspect, wherein the current collecting plate in the top cover assembly is connected to the negative electrode of the battery cell.

[0019] In a third aspect, the present application also provides an energy storage device, comprising the battery of the second aspect.

[0020] In a fourth aspect, the present application further provides an electrical equipment, comprising the energy storage device of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0022] Figure 1 A top view of the top cover assembly involved in this application;

[0023] Figure 2 For along Figure 1 The cross-sectional view obtained by cutting along the cutting line AA shown;

[0024] Figure 3 A schematic diagram of a top cover in a top cover assembly involved in this application;

[0025] Figure 4 A schematic diagram of a pole in a top cover assembly involved in this application;

[0026] Figure 5 This is a schematic diagram of the upper plastic and the pressing block in the top cover assembly involved in the present application;

[0027] Figure 6 A schematic diagram of the lower plastic in the top cover assembly involved in this application;

[0028] Figure 7 A schematic diagram of a sealing ring in a top cover assembly involved in the present application;

[0029] Figure 8 A schematic diagram of an energy storage device involved in this application;

[0030] Fig. 9 This is a schematic diagram of the electrical equipment involved in this application.

[0031] Description of reference numerals:

[0032] 1-lower plastic, 2-top cover, 3-upper plastic, 4-pressing block, 5-pole, 6-second sealing ring, 7-first sealing ring, 8-third sealing ring; 11-positioning column, 12-seventh through hole, 13-vent hole;

[0033] 21-first through hole, 22-second through hole, 23-third through hole, 24-explosion-proof hole, 31-positioning protrusion;

[0034] 41 - fourth through hole, 42 - sixth through hole, 43 - fifth through hole, 44 - positioning groove, 45 - first outward expansion area, 46 - second outward expansion area;

[0035] 51-bottom plate, 52-first column, 53-first groove, 54-second groove, 55-second column;

[0036] 9-collecting plate, 91-flat plate, 92-boss;

[0037] 100- backup power supply system, 200- photovoltaic panels, 300- household appliances;

[0038] 401-Energy storage device, 402-Battery. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0040] See also Figure 1 and Figure 2 The top cover assembly includes a lower plastic 1, a top cover 2, an upper plastic 3, a pressing block 4, a pole 5, a second sealing ring 6, a first sealing ring 7, a third sealing ring 8 and a collecting plate 9. The lower plastic 1 is stacked on the side of the bottom plate 51 facing the top cover 2, and is used to cooperate with the top cover 2 to position the pole 5. The first sealing ring 7, the second sealing ring 6 and the third sealing ring 8 are stacked between the bottom plate 51 of the pole 5 and the top cover 2, and are used to ensure the sealing between the top cover 2 and the pole 5, wherein the first sealing ring 7 is located between the second sealing ring 6 and the third sealing ring 8 to prevent the second sealing ring 6 and the third sealing ring 8 from shifting. The upper plastic 3 is arranged on the side of the top cover 2 facing away from the bottom plate 51, and the pressing block 4 is arranged on the side of the upper plastic 3 facing away from the top cover 2, and the upper plastic 3 and the pressing block 4 are pressed and fixed together. The current collecting plate 9 is arranged on the side of the bottom plate 51 away from the top cover 2, and is stacked with the bottom plate 51. The current collecting plate 9 includes a flat plate 91 and a boss 92. The boss 92 protrudes from the surface of the flat plate 91 facing the bottom plate 51, and the boss 92 is welded to the bottom plate 51. During welding, the welding equipment extends into the pressing block 4 and the top cover 2 in turn, reaches the bottom plate 51 and performs row welding, so that the bottom plate 51 and the boss 92 of the current collecting plate 9 are connected, and the welding of the bottom plate and the current collecting plate is completed. When the welded top cover assembly is placed in the battery casing, due to the simple structure of the planar current collecting plate, the placement process is easy to control, which avoids the problem of difficult centering of the current collecting plate, and the current collecting plate occupies less internal space of the battery, saving the internal space of the battery cell and improving the energy density of the battery cell.

[0041] See also Figure 3 The top cover 2 is provided with a first through hole 21, a second through hole 22, a third through hole 23 and an explosion-proof hole 24. The first through hole 21 and the second through hole 22 are respectively used for the first column 52 and the second column 55 to pass through, the third through hole 23 is used for the welding equipment to extend into for welding operations, and the explosion-proof hole 24 is used for installing an explosion-proof valve, so that the explosion-proof valve releases the thermal runaway gas inside the battery to prevent explosion.

[0042] See also Figure 4The pole 5 includes a bottom plate 51, a first column 52, a first groove 53, a second groove 54 and a second column 55. In the top cover assembly, the bottom plate 51 is spaced apart from the top cover 2, the first column 52 is connected to the bottom plate 51, and the first column 52 extends into the first through hole 21, and the second column 55 is connected to the bottom plate 51, and the second column 55 extends into the second through hole 22. The first column 52 and the second column 55 in the pole 5 are connected to the bottom plate 51, and the first column 52 and the second column 55 are both arranged on the side of the bottom plate 51 facing the top cover 2, forming an integrated structure, which is convenient for processing and production. The first column 52 and the second column 55 can be a cylinder or a square cylinder. Considering that the geometric shape of the cylinder is simpler, it can better withstand the axial force and is easier to position and fix during assembly, the first column 52 and the second column 55 in this application are cylinders, and the corresponding first through hole 21 and the second through hole 22 are also circular holes. In order to ensure the symmetry and force stability of the structure, the diameters of the first column 52 and the second column 55 are the same. Similarly, the diameters of the first through hole 21 and the second through hole 22 are also the same. In the actual production process of the pole 5, the integrated structure is relatively simple to produce and process, which helps to improve product productivity. When the top cover assembly is assembled, the first column 52 and the second column 55 on the bottom plate 51 cooperate with each other to disperse the torque and enhance the torsion resistance of the top cover assembly. The top cover 2 cooperates with the pole 5, and is provided with a first through hole 21 and a second through hole 22. The first column 52 and the second column 55 in the pole 5 extend into the first through hole 21 and the second through hole 22 of the top cover 2, respectively, to achieve precise positioning of the pole 5 and the top cover 2. Compared with the single pole structure, during welding, the present application performs penetration welding on the bottom plate 51 and the collector plate 9, and the first column 52 and the second column 55 provided on the pole 5 are positioned corresponding to the first through hole 21 and the second through hole 22 on the top cover 2. During welding, the welding equipment sequentially extends into the sixth through hole 42 of the pressing block 4 and the third through hole 23 of the top cover 2 to reach the first groove 53 of the bottom plate 51, and performs welding at the second groove 54 to connect the bottom wall of the second groove 54 and the boss 92 of the collecting plate 9, thereby completing the welding of the bottom plate and the collecting plate.

[0043] The surface of the bottom plate 51 facing the top cover 2 is provided with a first groove 53, and the first groove 53 is located between the first column 52 and the second column 55. A first sealing ring 7 is provided in the first groove 53, and the first sealing ring 7 is in close contact with the bottom plate 51 and the top cover 2. The first groove 53 is provided between the first column 52 and the second column 55 on the bottom plate 51, and the first column 52 and the second column 55 extend into the first through hole 21 and the second through hole 22 of the top cover 2 respectively for assembly. The first groove 53 is located in the middle position of the bottom plate 51 and the top cover 2 at the same time, and the projection direction of the first groove 53 in the thickness direction of the collector plate is also located in the middle of the collector plate to ensure that the bottom plate 51 and the collector plate are aligned during welding. A first sealing ring 7 is provided in the first groove 53, and the first sealing ring 7 is in close contact with the bottom plate 51 and the top cover 2 to prevent other components from moving and interfering with welding. The first groove 53 can be a circular groove or a square groove or other shapes. Since the circular groove can be realized by conventional mechanical processing means such as drilling, and the circular groove can also provide uniform support during the penetration welding process between the bottom plate 51 and the top cover 2, the present application adopts a circular groove, and correspondingly, the first sealing ring 7 is also a circular sealing ring with a hole in the middle. The first sealing ring 7 is arranged in the first groove 53, which increases the contact area between the sealing ring and the bottom plate 51. The heat generated during welding is transferred through the first sealing ring 7, which prolongs the heat transfer path during the welding of the collector plate, ensuring the sealing of the top cover 2 while avoiding other components from being burned.

[0044] The bottom wall of the first groove 53 is provided with a second groove 54 for welding with the current collecting plate, and the distance between the bottom wall of the second groove 54 and the surface of the bottom plate 51 facing away from the top cover 2 is greater than 0 mm and less than or equal to 0.5 mm. The second groove 54 is located in the middle of the first groove 53, and the second groove 54 is the main welding position for penetration welding between the bottom plate 51 and the current collecting plate. The diameter of the hole in the middle of the first sealing ring 7 is greater than or equal to the diameter of the second groove 54, so that the welding equipment can pass smoothly when the bottom plate 51 and the current collecting plate are welded. After the welding equipment extends into the top cover assembly and reaches the first groove 53, the bottom plate 51 and the current collecting plate are penetrated and welded at the second groove 54. The second groove 54 is the main welding position between the bottom plate 51 and the current collecting plate, and the distance between the bottom wall of the second groove 54 and the surface of the bottom plate 51 facing away from the top cover 2 is greater than 0 mm and less than or equal to 0.5 mm. The thickness is relatively thin, which is convenient for penetration welding between the bottom plate 51 and the current collecting plate, saving the welding time of penetration welding between the bottom plate 51 and the current collecting plate, and improving the production rate of the product.

[0045] A second sealing ring 6 and a third sealing ring 8 are also provided between the bottom plate 51 and the top cover 2. The second sealing ring 6 is sleeved on the first column 52, and the second sealing ring 6 is located between the bottom plate 51 and the top cover 2, and the third sealing ring 8 is sleeved on the second column 55, and the third sealing ring 8 is located between the bottom plate 51 and the top cover 2. Since the first column 52 and the second column 55 have the same diameter, in the length direction of the bottom plate 51, the first column 52 and the second column 55 are symmetrically distributed on both sides of the first groove 53, and the second sealing ring 6 is sleeved on the first column 52, and the third sealing ring 8 is sleeved on the second column 55, so in the present application, the second sealing ring 6 and the third sealing ring 8 have the same shape and size, and are both annular sealing rings. The inner wall of the second sealing ring 6 is tightly fitted with the first column 52, the inner wall of the third sealing ring 8 is tightly fitted with the second column 55, and the contact surfaces of the second sealing ring 6 and the third sealing ring 8 with the top cover 2 and the bottom plate 51 are flat and smooth, ensuring the seal between the top cover 2 and the bottom plate 51. The first sealing ring 7 is located between the second sealing ring 6 and the third sealing ring 8 to prevent the second sealing ring 6 and the third sealing ring 8 from shifting during the assembly process.

[0046] The top cover 2 is provided with a third through hole 23 for the welding equipment to extend into the top cover assembly. The third through hole 23 is located between the first through hole 21 and the second through hole 22. The projection of the third through hole 23 along the thickness direction of the top cover assembly overlaps with the first groove 53. Considering that the first through hole 21 and the second through hole 22 are both circular through holes, and the first groove 53 is also a circular groove, in the present application, the third through hole 23 is also a circular through hole. It is worth noting that in order to better carry out the welding operation between the bottom plate 51 and the current collecting plate, the diameter of the third through hole 23 is larger than the first through hole 21 and the second through hole 22, so as to facilitate welding when producing the top cover assembly. When the bottom plate 51 is welded to the current collecting plate, the welding equipment extends from the third through hole 23 and performs penetration welding at the first groove 53.

[0047] In the top cover assembly, the upper plastic 3 is located on the side of the top cover 2 facing away from the bottom plate 51, and the pressing block 4 is located on the side of the upper plastic 3 facing away from the top cover 2. The upper plastic 3 and the pressing block 4 cooperate to press and assemble the top cover assembly. Figure 5 The upper plastic 3 is provided with a step inward along the outer contour, the size of the step matches the outer contour of the pressing block 4, a positioning protrusion 31 is provided in the step, and a positioning groove 44 is provided on the outer contour of the pressing block 4. The positioning protrusion 31 cooperates with the positioning groove 44 to prevent the upper and lower surfaces of the pressing block from being reversed, and to prevent the top cover 2 and the pole 5 from shifting. This facilitates the positioning of the upper plastic 3 and the pressing block 4 and avoids deviation during assembly.

[0048] The pressing block 4 is provided with a fourth through hole 41, a fifth through hole 43 and a sixth through hole 42, which correspond to the first through hole 21, the second through hole 22 and the third through hole of the top cover 2, respectively. The fourth through hole 41 and the fifth through hole 43 are arranged at intervals along the length direction of the pressing block 4. The fourth through hole 41 is used for the first column 52 to pass through, and the projection of the fourth through hole 41 in the thickness direction of the top cover assembly overlaps with the first through hole 21 of the top cover 2. The fifth through hole 43 is used for the second column 55 to pass through, and the projection of the fifth through hole 43 in the thickness direction of the top cover assembly overlaps with the second through hole 22 of the top cover 2, and the projection of the sixth through hole 42 in the thickness direction of the top cover assembly overlaps with the first groove 53. After the fourth through hole 41 and the fifth through hole 43 cooperate with the first column 52 and the second column 55 to press the top cover 2, the sixth through hole 42 allows the welding equipment to extend into the second groove 54 in the first groove 53 for penetration welding.

[0049] The first and second expansion areas 45 and 46 are respectively provided on both sides of the pressing block 4 along the width direction. The sixth through hole 42 is located between the fourth and fifth through holes 41 and 43 , and the sixth through hole 42 is located between the first and second expansion areas 45 and 46 .

[0050] The diameter of the sixth through hole 42 is greater than the diameter of the fourth through hole 41, and the diameter of the sixth through hole 42 is greater than the diameter of the fifth through hole 43. The first expansion area 45 and the second expansion area 46 are symmetrical along the length direction of the compact 4. Since the sixth through hole 42 is located between the first expansion area 45 and the second expansion area 46, in order to adapt to the shape of the sixth through hole 42, the first expansion area 45 and the second expansion area 46 are both arc-shaped, which is convenient for processing and can better transfer the heat generated during welding. Since the fourth through hole 41, the fifth through hole 43 and the sixth through hole 42 of the pressing block 4 correspond to the first through hole 21, the second through hole 22 and the third through hole 23 of the top cover 2 respectively, and the diameter of the third through hole 23 is larger than the diameter of the first through hole 21 and the second through hole 22, the diameter of the sixth through hole 42 is larger than the diameter of the fifth through hole 43 of the fourth through hole 41. When the welding equipment is inserted into the sixth through hole 42 for penetration welding, the diameter of the sixth through hole 42 is enlarged, the first outer expansion area 45 and the second outer expansion area 46 provide ample operating space for the welding equipment, and the first outer expansion area 45 and the second outer expansion area 46 increase the heat transfer area during welding, which is conducive to heat dissipation and improves the flow and welding strength.

[0051] See also Figure 6 The lower plastic 1 is provided with a seventh through hole 12 for the first column 52, the second column 55 and the first groove 53 to pass through. The seventh through hole 12 can be in a rectangular, elliptical or circular shape, see Figure 7, the outer contours of the first sealing ring 7, the second sealing ring 6 and the third sealing ring 8 are all circular. In order to better position the lower plastic, the seventh through hole 12 in the present application is composed of three arcs, with a through hole in the middle. The inner wall of the seventh through hole 12 fits the first sealing ring 7, the second sealing ring 6 and the third sealing ring 8, which are used to position the pole 5. A vent 13 is also provided on the lower plastic 1 to ensure that the gas generated during welding can be discharged through the vent 13 to prevent explosion. A positioning column 11 is provided on the side of the lower plastic 1 facing away from the bottom plate 51, and a positioning hole is provided on the side of the top cover 2 facing the bottom plate 51. The positioning column 11 cooperates with the positioning hole to position the pole 5. When the top cover 2 is assembled on the bottom plate 51, the positioning hole on the top cover 2 cooperates with the positioning column 11 on the lower plastic 1 to fix the pole 5, preventing the pole 5 from being misplaced during the welding operation and improving the positioning accuracy.

[0052] The present application also provides a battery, comprising a battery cell and the top cover assembly described above, wherein a current collecting plate in the top cover assembly is connected to the negative electrode of the battery cell.

[0053] The bottom plate 51 and the current collecting plate 9 are welded by penetration welding. The current collecting plate 9 is adjusted to a flat type and is provided with a boss 92 that is convenient for penetration welding. When performing penetration welding, the welding equipment extends into the top cover assembly to weld the bottom plate 51 and the boss 92. The problem of difficult centering of the current collecting plate is solved, and the internal space of the battery is also saved. The bottom plate 51 is provided with a first column 52, a second column 55 and a first groove 53. The first column 52 and the second column 55 form an integral structure with the bottom plate 51, and the first groove 53 is located between the first column 52 and the second column 55. The bottom wall of the first groove 53 is provided with a second groove 54, and the distance between the bottom wall of the second groove 54 and the current collecting plate is greater than 0mm and less than or equal to 0.5mm, and the second groove 54 serves as a welding point for penetration welding. A first sealing ring 7 is provided in the first groove 53, which is in close contact with the bottom plate 51 and the top cover 2 to prevent other components from moving and interfering with welding. The second sealing ring 6 and the third sealing ring 8 are respectively sleeved on the first cylinder 52 and the second cylinder 55, and the inner walls of the second sealing ring 6 and the third sealing ring 8 are respectively tightly fitted with the first cylinder 52 and the second cylinder 55, and the contact surfaces of the second sealing ring 6 and the third sealing ring 8 with the top cover 2 and the bottom plate 51 are flat and smooth, ensuring the seal between the top cover 2 and the bottom plate 51. The lower plastic 1 is provided with a seventh through hole 12 for the first cylinder 52, the second cylinder 55 and the first groove 53 to pass through. The top cover 2 is provided with a first through hole 21 for the first cylinder 52 to pass through, and the top cover 2 is provided with a second through hole 22 for the second cylinder 55 to pass through. The top cover 2 is provided with a third through hole 23, and the projection in the thickness direction of the top cover assembly overlaps with the first groove 53. The pressing block 4 is provided with a fourth through hole 41 for the first cylinder 52 to pass through. The pressing block 4 is provided with a fifth through hole for the second cylinder 55 to pass through. The pressing block 4 is provided with a sixth through hole 42, and the projection of the sixth through hole 42 in the thickness direction of the top cover assembly overlaps with the first groove 53. During welding, the welding equipment sequentially extends into the sixth through hole 42 of the pressing block 4 and the third through hole 23 of the top cover 2 to reach the first groove 53 of the bottom plate 51, and performs welding at the second groove 54, so that the bottom wall of the second groove 54 is connected to the collector plate, and the welding of the bottom plate and the collector plate is completed. The folded collector plate is adjusted to a flat structure with a boss, and the bottom plate and the collector plate are welded by penetration welding, which reduces the installation time and improves the product production rate and product yield.

[0054] The present application also provides an energy storage device, including the above-mentioned battery. In certain embodiments, the energy storage device includes but is not limited to a single cell, a battery pack, a battery module, and a battery system. When the energy storage device is a single cell, it can be cylindrical. Figure 8When the energy storage device 401 is a battery pack, a battery module or a battery system, a plurality of batteries 402 may be arranged therein. The energy storage device 401 may be used for peak load regulation of the power grid, releasing energy during peak power demand to relieve pressure on the power grid; for renewable energy integration, the energy storage device may smooth the volatility of renewable energy generation and improve its dispatchability; for emergency power supply, the energy storage device may provide backup power supply during power outages to ensure the normal operation of key facilities; for user-side management, the energy storage device may be used to arbitrage the difference in peak and valley electricity prices to reduce electricity costs.

[0055] The present application also provides an electrical device, including the above energy storage device, which can supply power to the electrical device, including but not limited to vehicles, energy storage systems, household appliances, and public facilities. Fig. 9 Taking household equipment as an example, the electrical equipment may be a backup power supply system 100 , a photovoltaic component 200 , or a household appliance 300 .

[0056] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A top cover assembly, characterized in that: include: The top cover is provided with a first through hole; A pole, comprising a bottom plate and a first column, wherein the bottom plate is spaced apart from the top cover, the first column is connected to the bottom plate, and the first column extends into the first through hole; The collecting plate is arranged on a side of the bottom plate away from the top cover. The collecting plate and the bottom plate are stacked. The collecting plate includes a flat plate and a boss. The boss protrudes from the surface of the flat plate facing the bottom plate. The boss is welded to the bottom plate.

2. The top cover assembly according to claim 1, characterized in that: The top cover is provided with a second through hole spaced apart from the first through hole, the pole further comprises a second column, the first column and the second column are both connected to the surface of the bottom plate facing the top cover, and the second column extends into the second through hole.

3. The top cover assembly according to claim 2, characterized in that: A first groove is provided on the surface of the bottom plate facing the top cover. A first sealing ring is provided in the first groove. The first sealing ring is in close contact with the bottom plate and the top cover.

4. The top cover assembly according to claim 3, characterized in that: The first groove is located between the first column and the second column.

5. The top cover assembly according to claim 3, characterized in that: The top cover further includes a third through hole, the third through hole is located between the first through hole and the second through hole, and a projection of the third through hole along a thickness direction of the top cover assembly overlaps with the first groove.

6. The top cover assembly according to claim 3, characterized in that: The bottom wall of the first groove is provided with a second groove for welding with the collecting plate.

7. The top cover assembly according to claim 6, characterized in that: The distance from the bottom wall of the second groove to the surface of the bottom plate facing away from the top cover is greater than 0 mm and less than or equal to 0.5 mm.

8. The top cover assembly according to claim 7, characterized in that: The top cover assembly also includes a second sealing ring and a third sealing ring; The second sealing ring is sleeved on the first column, and the second sealing ring is located between the bottom plate and the top cover; The third sealing ring is sleeved on the second column, and the third sealing ring is located between the bottom plate and the top cover.

9. The top cover assembly according to claim 8, characterized in that: The top cover assembly further comprises an upper plastic and a pressing block, wherein the upper plastic is located on a side of the top cover facing away from the bottom plate, and the pressing block is located on a side of the upper plastic facing away from the top cover.

10. The top cover assembly according to claim 9, characterized in that: The pressing block is provided with a fourth through hole, a fifth through hole and a sixth through hole, the fourth through hole is used for the first column to pass through, and the fifth through hole is used for the second column to pass through; A projection of the sixth through hole along a thickness direction of the top cover assembly overlaps with the first groove.

11. The top cover assembly according to claim 10, characterized in that: The fourth through hole and the fifth through hole are arranged at intervals along the length direction of the pressing block, the first outward expansion area and the second outward expansion area are respectively protruded on both sides of the pressing block along the width direction, the sixth through hole is located between the fourth through hole and the fifth through hole, and the sixth through hole is located between the first outward expansion area and the second outward expansion area; The diameter of the sixth through hole is greater than the diameter of the fourth through hole, and the diameter of the sixth through hole is greater than the diameter of the fifth through hole.

12. The top cover assembly according to claim 1, characterized in that: The top cover assembly further includes a lower plastic, and the lower plastic is stacked and arranged on the surface of the bottom plate facing the top cover; The lower plastic is provided with a seventh through hole for the first column, the second column and the first groove to pass through.

13. The top cover assembly according to claim 12, characterized in that: A positioning column is arranged on a side of the lower plastic facing away from the bottom plate, and a positioning hole is arranged on a side of the top cover facing the bottom plate. The positioning column cooperates with the positioning hole to position the pole.

14. A battery, characterized in that: It comprises a top cover assembly and a battery cell as described in any one of claims 1 to 13; the current collecting plate in the top cover assembly is connected to the negative electrode of the battery cell.

15. An energy storage device, characterized in that: The energy storage device comprises the battery as claimed in claim 14.

16. An electrical equipment, characterized in that: The electrical equipment includes the energy storage device as claimed in claim 15.

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