High capacity battery

Abstract

High-capacity battery, characterized by the fact that the battery a square housing (1) whose underside is openly and sealingly connected to a cover plate (2), and whose upper side is formed internally with two expansion grooves (3), the bottoms of the two expansion grooves (3) each being provided with a mounting hole, at each of the two mounting holes a positive pole connection (4) and a negative pole connection (5) being insulated and sealed, the positive pole connection (4) and the negative pole connection (5) each projecting into the two expansion grooves (3); and a pole core (6) in the square housing (1), on its upper side a pole flag of the positive pole (7) and a pole flag of the negative pole are provided, wherein the pole flag of the positive pole (7) and the pole flag of the negative pole each project into the two extension grooves and are each electrically connected to the terminal of the positive pole (4) and the terminal of the negative pole (5), includes.

Description

TECHNICAL AREA

[0001] The invention relates to the technical field of batteries, in particular a high-capacity battery. STATE OF THE ART

[0002] With the ongoing development of electric vehicles, people's demands on these vehicles are also increasing. The industry is continuously rising to the challenge of achieving greater range, and models with a range of over 800 km have been released successively.

[0003] The key to increasing battery range lies in improving the battery's volume utilization rate. Current square battery designs primarily consist of a top-mounted cover plate structure, with the pole core and terminal tab connected to the terminal and cover plate. Space must be left at the top of the casing to accommodate the terminal tab. Simultaneously, the rounded corners at the bottom of the casing engage with the pole core. As the battery expands and contracts, a dead zone is created at this engagement point, shortening the battery's lifespan. Therefore, a base support must be installed to elevate the pole core, preventing it from colliding with the rounded corners of the casing base.The current design of square batteries requires space at the top of the casing to accommodate the terminal tabs, and a base support at the bottom of the casing to raise the pole core. This severely limits the volume utilization rate of the square casing. Therefore, it is particularly important to improve the effective volume utilization rate for the terminal tabs and to enhance the effective utilization of stacked or rolled cores. SUMMARY OF USE PATTERNS

[0004] Based on this, the invention offers a high-capacity battery to solve the technical problem that the volume utilization rate of the current battery with the square casing is very limited.

[0005] The invention provides a high-capacity battery comprising the following: a square housing, the underside of which is open and sealingly connected to a cover plate, and the top of which is formed internally with two expansion grooves, the bottoms of the two expansion grooves each being provided with a mounting hole, at each of the two mounting holes a positive pole connection and a negative pole connection being insulated and sealed, the positive pole connection and the negative pole connection each projecting into the two expansion grooves; and a pole core in a square housing, on its upper side a pole flag of the positive pole and a pole flag of the negative pole are provided, wherein the pole flag of the positive pole and the pole flag of the negative pole each project into the two extension grooves and are each electrically connected to the terminal of the positive pole and the terminal of the negative pole.

[0006] In this invention, the structure of the square housing is improved by providing two expansion grooves on the top surface of the square housing. These expansion grooves are used for mounting the positive and negative pole connections, respectively, and both expansion grooves can simultaneously be used to enlarge the same space in which the positive and negative pole terminals extend. Furthermore, an opening is provided on the underside of the square housing, and a cover plate is tightly fitted to this opening, thus eliminating the need for the rounded corner structure on the underside of the square housing. This does not impair the underside of the pole core, and consequently, the lower support structure can be omitted.This effectively improves the space utilization of the square housing in the Z direction and thereby the space utilization of the pole core within the square housing, thus increasing the energy density of the battery.

[0007] In a further development of the above solution of the invention, two outwardly projecting protrusions are punched on the top of the square housing, with an expansion groove formed inside the protrusion.

[0008] In a further development of the above solution of the invention, the projection has an arc-shaped cross-section or a square cross-section.

[0009] In a further development of the above solution of the invention, a sealing ring is encased on the outside of the connection of the positive pole and the connection of the negative pole, wherein the connection of the positive pole and the connection of the negative pole receive an insulating seal against the square housing by the respective sealing ring.

[0010] In a further development of the above solution of the invention, the positive pole connection and the negative pole connection each represent an inverted T-shaped structure, wherein the lateral sections of the positive pole connection and the negative pole connection are each welded to the pole tab of the positive pole and the pole tab of the negative pole.

[0011] In a further development of the above solution of the invention, the pole flag of the positive pole has a curved section in the corresponding extension groove, the curved section is arranged above the lateral section of the positive pole connection, and the curved section of the pole flag of the positive pole is welded to the upper side surface of the lateral section of the positive pole connection.The negative terminal tab has a curved section in the corresponding expansion groove. This curved section is positioned above the lateral section of the negative terminal and is welded to the upper side surface of the lateral section of the negative terminal. The inner walls of both expansion grooves are fitted with insulating films at the points corresponding to the curved sections of the positive and negative terminal tabs. The positive and negative terminal tabs are each directly welded to the positive and negative terminals, respectively, eliminating the need for connecting pieces, saving additional vertical space within the square casing, and improving the overall current-carrying capacity of the battery structure.The insulating films are placed near the pole vane, which on the one hand provides an insulating protective function and on the other hand improves the heat conduction efficiency between the pole vane and the square housing in order to dissipate the temperature to the outside in a timely manner.

[0012] In a further development of the above solution of the invention, the two sealing rings extend to the outside of the square housing and bear against its outer side surface. Pressure plates are welded to the ends of the positive and negative terminals, respectively, with the ends of these plates located outside the square housing. The pressure plates are pressed against the two sealing rings. The sealing performance of the positive and negative terminals is ensured by adjusting the pressure plates.

[0013] In a further development of the above solution of the invention, the cover plate is connected to the open end of the square housing by lateral or vertical welding in a sealing and adapting manner to ensure the overall seal and the mechanical properties of the battery.

[0014] In a further development of the above solution of the invention, the depth of the extension groove is 1-3 mm. By arranging the extension groove with a depth of 1-3 mm, the height space of the square housing can be further optimized by 1-3 mm.

[0015] In a further development of the above solution of the invention, the distance between the edges of the positive pole connection and the negative pole connection and the inner wall of the extension groove is 2-3 mm.

[0016] Compared to the prior art, the invention has the following advantages: 1. In the present invention, the structure of the square housing is improved by providing two expansion grooves on the upper side of the square housing, each for receiving the pole tab of the positive pole and the pole tab of the negative pole of the pole core, so that the pole tabs of the positive pole and the pole tab of the negative pole no longer occupy any of the interior space of the square housing. Simultaneously, an opening is provided on the underside of the square housing, and a cover plate is attached to the underside in a sealing manner, thus eliminating the need for the rounded corner structure on the underside of the square housing, so as not to disturb the pole core.This eliminates the need for the lower support structure, effectively improving the space utilization of the square housing in the Z-direction and thereby improving the space utilization of the pole core within the square housing, thus increasing the energy density of the battery. 2. In the battery of the invention, the undersides of the positive terminal and the negative terminal are each directly welded to the positive and negative terminal tabs in the two expansion grooves. This means that the positive and negative terminals no longer occupy any of the interior space of the square housing, and the connecting piece is eliminated, saving further space in the vertical direction of the square housing and improving the overall current-carrying capacity of the battery structure. At the same time, a certain gap is created on the outer circumference of the sealing ring located in the expansion groove due to the thickness of the sealing ring. In this invention, the curved sections of the positive and negative terminal tabs wrap around the outer edge of the terminals and penetrate into the gap, so that the curved sections of the positive and negative terminal tabs are welded to the top surface of the terminals in an overlapping fashion.This saves space and improves the utilization of the pole core within the square housing. The space saved by the invention is equal to the sum of the thickness of the eliminated connecting piece (0.4-1.5 mm), the thickness of the lateral section of the connection (1-1.5 mm), and the thickness of the pole vane. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic representation of the structure of a high-capacity battery provided in one embodiment of the invention; Fig. 2 is a top view of Fig. 1; Fig. Figure 3 is a cross-sectional view along line AA in Fig. 2; Fig. Figure 4 is a cross-sectional view of Fig. 2 in a different direction; Fig. Figure 5 is an enlarged schematic representation of point B in Fig. 3; Fig. Figure 6 is a partially enlarged schematic representation of Fig. 4; Fig. Figure 7 is an enlarged partial view of Fig. 5.

[0017] Reference numeral list: 1. Square housing; 2. Cover plate; 3. Expansion groove; 4. Positive terminal; 5. Negative terminal; 6. Pole core; 7. Positive terminal tab; 8. Projection; 9. Sealing ring; 10. Insulating film; 11. Pressure plate; 12. Explosion-proof valve; 13. Injection hole. DESCRIPTION OF THE EXECUTION FORMS

[0018] To facilitate understanding of the present utility model, it is described in more detail below using exemplary embodiments. However, the invention can be implemented in many different forms and is not limited to the embodiments described here. Rather, these embodiments serve to make the disclosure of this invention more comprehensive and understandable.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as they are normally understood by those skilled in the art in the field of this invention. The terms used in this description of the invention serve only to describe specific embodiments and are not intended to limit the invention.

[0020] As in Fig. 1 to Fig. As shown in Figure 4, in this embodiment a high-capacity battery is provided, comprising a square housing 1 and a pole core 6.

[0021] In this embodiment, the lower end of the square housing 1 is open. The lower end of the square housing 1 is connected to a cover plate 2 for sealing the housing by lateral or vertical welding. As shown in the overview of Fig. 4 and Fig. As shown in Figure 5, two outwardly projecting protrusions 8 are punched into the upper surface of the square housing 1, each with an expansion groove 3 on its inner side. In this embodiment, the protrusions 8 have a square cross-section. In other embodiments, the protrusions 8 can, of course, also have an arcuate cross-section. Each of the two protrusions 8 is provided with mounting holes, in which a positive terminal 4 and a negative terminal 5 are each provided. The positive terminal 4 and the negative terminal 5 are each encased in a sealing ring 9, the sealing ring 9 extending on the outer surface of the protrusion 8. The sealing ring 9 provides a seal between the positive terminal 4, the negative terminal 5, and the square housing 1.In this embodiment, the positive pole connection 4 and the negative pole connection 5 each have an inverted T-shaped structure, with the lateral sections of the positive pole connection 4 and the negative pole connection 5 each extending into the two expansion grooves 3. The ends of the positive pole connection 4 and the negative pole connection 5 located outside the square housing 1 are each welded to a pressure plate 11, and the two pressure plates 11 are each pressed firmly against the two sealing rings 9.

[0022] The pole core 6 is arranged in the square housing 1. On its upper side, a pole flag of the positive pole 7 and a pole flag of the negative pole are formed, wherein the pole flag of the positive pole 7 and the pole flag of the negative pole are each arranged according to the two extension grooves 3, wherein the pole flag of the positive pole 7 and the pole flag of the negative pole each extend into the two extension grooves 3 and the curved sections of the pole flag of the positive pole 7 and the pole flag of the negative pole each extend to the upper side of the lateral section of the connection of the positive pole 4 and negative pole connection 5.The curved sections of the positive pole 7 and negative pole terminals are each welded to the upper side of the lateral section of the positive pole 4 and negative pole 5 terminals. An insulating film 10 is provided between the weld and the inner wall of the expansion groove 3. In this embodiment, the pole core 6 is arranged in a stacked structure. Of course, in other embodiments, the pole core 6 can also be arranged in a coiled form.In order for the pole flag of the positive pole 7 and the pole flag of the negative pole to enter the extension groove 3 in this embodiment, the width and length of the extension groove 3 must meet the following requirements: The distance between the inner wall of the extension groove 3 and the edge of the connection of the positive pole 4 and the connection of the negative pole 5 is 2-3 mm.

[0023] In this embodiment, the housing is provided with an explosion-proof valve 12 and an injection hole 13 at a position between the two projections 8. Of course, in other embodiments, an explosion-proof valve 12 and an injection hole 13 can be provided on the cover plate 2.

[0024] Due to the above structural arrangement, during assembly of the battery according to the present embodiment, the terminal tab of the positive pole 7 and the terminal tab of the negative pole of the stacked pole core 6 are first centered and joined together. Then, in combination with Fig.7. The curved sections of the positive pole's terminal 7 and the negative pole's terminal are each wrapped around the edges of the lateral section of the positive pole's connection 4 and the negative pole's connection, thereby covering the upper side surface of the lateral section of the positive pole's connection 4 and the negative pole's connection. The curved sections of the positive pole's terminal 7 and the negative pole's terminal are butterfly welded to the upper side surfaces of the lateral section of the positive pole's connection 4 and the negative pole's connection.The square housing 1 is then installed upside down outside the pole core 6 with the opening facing downwards, so that the positive pole 4 and negative pole 5 connections each pass through their respective mounting holes. The compression of the sealing ring 9 is controlled by adjusting the stroke, thus preventing the rounded corners of the square housing 1 from interfering with the corner position of the pole core 6 and improving its service life. The two pressure plates 11 are then welded to the top of the positive pole 4 and negative pole 5 connections, respectively. The pressure plates 11 seal the connections, the sealing ring 9, the projections 8, etc., to ensure a tight seal between the positive pole 4 and negative pole 5 connections.Finally, the cover plate 2 is welded to the open end of the square housing 1 by lateral or vertical welding to ensure the overall sealing and mechanical properties of the battery.

[0025] In this embodiment, the structure of the square housing 1 is improved by providing two expansion grooves 3 on the upper surface of the square housing 1, each for receiving the pole tab of the positive pole 7 and the pole tab of the negative pole of the pole core 6, so that the pole tabs of the positive pole 7 and the pole tab of the negative pole no longer occupy any of the interior space of the square housing 1. An opening is provided on the underside of the square housing 1, and a cover plate 2 is attached to the underside in a sealing manner, thus eliminating the need for the rounded corner structure on the underside of the square housing 1, so as not to interfere with the pole core 6.This eliminates the need for the lower support structure, effectively improving the space utilization of the square housing 1 in the Z direction and thereby improving the space utilization of the pole core 6 within the square housing 1, thus increasing the energy density of the battery.

[0026] In this embodiment, the undersides of the positive terminal 4 and the negative terminal 5 are each directly welded to the terminal tabs of the positive terminal 7 and the negative terminal 7 in the two expansion grooves 3, so that the positive terminal 4 and the negative terminal 5 no longer occupy any of the interior space of the square housing 1 and, at the same time, the connecting piece is eliminated, which saves further space in the vertical direction of the square housing 1 and improves the overall current-carrying capacity of the battery structure. Simultaneously, due to the thickness of the sealing ring 9, a certain gap is created on the outer circumference of the sealing ring 9 located in the expansion groove 3.In this invention, the curved sections of the positive pole 4 and negative pole n pole tabs wrap around the outer edge of the terminals and penetrate the gap, so that the curved sections of the positive pole 4 and negative pole n pole tabs are each welded overlapping to the top of the terminals. This saves space and improves the space utilization of the pole core in the square housing 1. The space saved by the invention is equal to the sum of the thickness of the eliminated connecting piece (0.4-1.5 mm), the thickness of the lateral section of the terminal (1-1.5 mm), and the thickness of the pole tab.

[0027] The technical features of the exemplary embodiments described above can be combined in any way. To keep the description concise, not all possible combinations of the technical features in the aforementioned exemplary embodiments have been described. However, as long as there are no contradictions between these combinations, they should be considered to be included within the scope of this description.

[0028] The embodiments described above represent only some embodiments of this invention. Their description is relatively specific and detailed, but should not be understood as limiting the scope of protection of the utility model patent. It should be noted that, for those skilled in the art, various modifications and improvements can be made without deviating from the concept of the present utility model, all of which fall within the scope of protection of the present utility model. Therefore, the scope of protection of the utility model patent should be defined by the accompanying claims.

Claims

[1] High-capacity battery, characterized by that the battery a square housing (1) whose underside is openly and sealingly connected to a cover plate (2), and whose upper side is formed internally with two expansion grooves (3), the bottoms of the two expansion grooves (3) each being provided with a mounting hole, at each of the two mounting holes a positive pole connection (4) and a negative pole connection (5) being insulated and sealed, the positive pole connection (4) and the negative pole connection (5) each projecting into the two expansion grooves (3); and a pole core (6) in the square housing (1), on its upper side a pole flag of the positive pole (7) and a pole flag of the negative pole are provided, wherein the pole flag of the positive pole (7) and the pole flag of the negative pole each project into the two extension grooves and are each electrically connected to the terminal of the positive pole (4) and the terminal of the negative pole (5), includes. [2] High-capacity battery according to claim 1, characterized by , that on the top of the square housing (1) two outwardly projecting protrusions (8) are punched, wherein an expansion groove (3) is formed inside the protrusion (8). [3] High-capacity battery according to claim 2, characterized by , that the projection (8) has an arc-shaped cross-section or a square cross-section. [4] High-capacity battery according to claim 1, characterized by, that a sealing ring (9) is encased on the outside of the connection of the positive pole (4) and the connection of the negative pole (5), wherein the connection of the positive pole (4) and the connection of the negative pole (5) are provided with an insulating seal against the square housing (1) by the respective sealing ring (9). [5] High-capacity battery according to claim 1, characterized by , that the positive pole connection (4) and the negative pole connection (5) each form an inverted T-shaped structure, wherein the lateral sections of the positive pole connection (4) and the negative pole connection (5) each extend into the two expansion grooves (3), and wherein the lateral sections of the positive pole connection (4) and the negative pole connection (5) are each welded to the positive pole terminal (7) and the negative pole terminal. [6] High-capacity battery according to claim 5, characterized by, that the pole flag of the positive pole (7) has a curved section in the corresponding extension groove (3), the curved section being arranged above the lateral section of the positive pole connection (4), and the curved section of the pole flag of the positive pole (7) being welded to the upper side surface of the lateral section of the positive pole connection (4), wherein the pole flag of the negative pole has a curved section in the corresponding extension groove (3), the curved section being arranged above the lateral section of the negative pole connection (5), and the curved section of the pole flag of the negative pole being welded to the upper side surface of the lateral section of the negative pole connection (5), wherein the inner walls of the two extension grooves (3) at the locations corresponding to the curved sections of the pole flag of the positive pole (7) and the pole flag of the negative pole,are equipped with insulating films (10). [7] High-capacity battery according to claim 4, characterized by , that the two sealing rings (9) extend to the outside of the square housing (1) and bear against the outer side surface of the square housing (1), with pressure plates (11) each being welded to the ends of the positive pole connection (4) and the negative pole connection (5), the ends being located outside the square housing (1), and the two pressure plates (11) being pressed against the two sealing rings (9). [8] High-capacity battery according to claim 1, characterized by , that the cover plate (2) is connected to the open end of the square housing (1) by lateral or vertical welding in a sealing and adapting manner. [9] High-capacity battery according to claim 1, characterized by , that the depth of the extension groove (3) is 1mm-3 mm. [10] High-capacity battery according to claim 1, characterized by , that the distance between the edges of the positive pole connection (4) and the negative pole connection (5) and the inner wall of the extension groove (3) is 2mm-3 mm.

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