Battery cover plate and battery

Abstract

In order to solve the problems that in the prior art, a welding seam protruding out of the surface of a pole connecting piece is formed in the welding process of the pole connecting piece and the pole, so that electric connection of the pole connecting piece and other structural parts is unstable, and impedance is large, the battery cover plate comprises a pole assembly, and the pole assembly comprises a first cover plate, the pole and the pole connecting piece; a second pole mounting hole is formed in the position, corresponding to the first pole mounting hole, of the pole connecting piece, an annular step groove is formed in the periphery of the end, away from the first cover plate, of the second pole mounting hole of the pole connecting piece, the pole penetrates through the first pole mounting hole, and the end of the pole is located in the second pole mounting hole. The inner wall of one end, deviating from the first cover plate, of the second pole mounting hole and the pole contact position form a weld joint; and the pole and the welding seam do not exceed one side of the pole connecting sheet deviating from the first cover plate. The battery cover plate provided by the utility model is favorable for forming a flat welding surface and effectively reducing the connection impedance of a welding position.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery cover and a battery. Background Art

[0002] The components of a power battery generally include a metal shell, a battery cell and a top cover assembly. The top cover assembly includes a metal cover plate, a lower plastic part, a pole structure, a liquid injection hole structure and an explosion-proof valve and other structures. Among them, both ends of the pole structure need to be fixed in cooperation with other structural parts. During the assembly process in the prior art, one end of the pole passes through the mounting hole on the top cover assembly and is fastened to the pole with a metal ring. During assembly, the end of the pole close to the battery cell is welded to a connecting piece or other metal structural parts to fix the pole. After welding, a welding surface will be formed at the contact position between the pole and the connecting piece. The welding surface is easy to protrude and be directly exposed to the outer surface of the connecting piece, affecting the flatness of the welding position.

[0003] When the power battery is in use, the pole ear on the battery cell needs to be connected to the metal cover plate, and the pole ear and the connecting plate (metal plate) are usually welded. If the weld between the welding surface of the pole column and the connecting plate protrudes from the surface of the connecting plate, it will affect the subsequent sufficient contact between the contact surface of the pole ear and the connecting plate, affect the welding effect, and is not conducive to reducing the impedance of the connection position, thereby affecting the stability of the overall assembly of the battery. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery cover and a battery in view of the problem that in the prior art, a weld protruding from the outer surface of the pole connecting piece is formed between the pole connecting piece and the pole in the power battery during the welding process, resulting in unstable electrical connection and large connection impedance between the pole connecting piece and other structural parts.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] Provided is a battery cover plate, comprising a pole assembly, the pole assembly comprising a first cover plate, a pole and a pole connecting piece, the pole connecting piece being used for welding a pole ear, a first pole mounting hole being provided on the first cover plate, a second pole mounting hole being provided on the pole connecting piece at a position corresponding to the first pole mounting hole, an annular step groove being provided on the pole connecting piece at an outer peripheral position of an end of the second pole mounting hole away from the first cover plate, the pole passing through the first pole mounting hole and an end of the pole being located in the second pole mounting hole, and a weld being formed at a position where an inner wall of the second pole mounting hole at an end away from the first cover plate contacts the pole;

[0007] The weld seals the joint between the pole and the pole connecting piece, and the pole and the weld do not extend beyond a side of the pole connecting piece that faces away from the first cover plate.

[0008] Optionally, the pole assembly further includes a pole pressing plate, the pole pressing plate is provided with first three-pole mounting holes, and one end of the pole away from the pole connecting plate is connected to the first three-pole mounting holes.

[0009] Optionally, the first cover plate is stacked with the pole pressing plate, and the first cover plate is arranged between the pole piece pressing plate and the pole connecting piece.

[0010] Optionally, the pole assembly further includes an insulating sheet, the insulating sheet includes a first insulating sheet and a second insulating sheet, the first insulating sheet is arranged between the first cover plate and the pole pressure plate, and the second insulating sheet is arranged between the first cover plate and the pole connecting sheet.

[0011] Optionally, the battery cover plate further includes a partition plate, the partition plate is provided with a groove, and the pole connecting piece is arranged in the groove.

[0012] Optionally, the groove is sunken from one side of the partition toward the other side, and a protrusion is formed on the other side of the partition.

[0013] Optionally, a baffle is provided at the bottom of the groove, and the baffle divides the groove into a plurality of through holes, which are used for the pole lug to pass through the through holes and be welded to the pole connecting piece.

[0014] Optionally, the battery cover plate further includes a second cover plate, the second cover plate is provided with a mounting hole and a liquid injection hole, and the second cover plate is embedded in the mounting hole.

[0015] Optionally, there are multiple poles, and the multiple poles are arranged in the pole assembly.

[0016] On the other hand, the present application provides a battery, including a battery cell, a tab, a shell and the battery cover, wherein the tab is arranged at the end of the battery cell, the battery cell is placed in the shell, and the battery cover closes the shell.

[0017] The battery cover provided by the utility model has a groove on the partition, and at least part of the pole connecting piece is placed in the groove. During the welding process between the pole and the pole connecting piece,

[0018] In the present application, the pole connecting piece is provided with the annular step groove at the outer peripheral position of one end of the second pole mounting hole away from the first cover plate, the pole passes through the first pole mounting hole and the end of the pole is located in the second pole mounting hole, at this time, the inner wall of the second pole mounting hole is welded to the pole contact position to form a weld, and the weld is used to seal the joint between the pole and the pole connecting piece, thereby improving the connection strength and sealing performance between the pole connecting piece and the pole; in addition, since the pole and the weld do not exceed the side of the pole connecting piece away from the first cover plate and the annular step groove, the side of the pole connecting piece away from the first cover plate in the structure is used as the welding area for welding with the pole ear, so that a flat welding surface can be formed, thereby solving the adverse effect of the protruding height of the weld on the surface flatness of the pole connecting piece, improving the welding quality of the pole connecting piece and the external electrical connector, and reducing the impedance of the welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the pole assembly provided by the utility model;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of another side of the pole assembly provided by the utility model;

[0021] Figure 3 It is an exploded view of the pole assembly provided by the utility model;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the partition provided by the utility model;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the other side of the partition provided by the utility model;

[0024] Figure 6 This is a schematic diagram of the battery cover structure provided by the utility model;

[0025] Figure 7 This is an explosion diagram of a battery provided by the utility model.

[0026] The reference numerals in the drawings of the specification are as follows:

[0027] 1. Pole assembly; 11. Pole; 12. Pole connecting plate; 121. Second pole mounting hole; 1211. Annular step groove; 13. Pole pressure plate; 131. Third pole mounting hole; 14. First cover plate; 141. First pole mounting hole; 15. First insulating sheet; 16. Second insulating sheet; 2. Partition plate 2; 21. Groove 21; 22. Protrusion; 23. Baffle; 24. Through hole; 3. Second cover plate; 31. Mounting hole; 32. Filling hole; 4. Battery cell; 5. Pole ear; 6. Shell; 100. Battery cover plate. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Reference Figures 1 to 3The present utility model embodiment provides a battery cover plate 100, comprising a pole assembly 1, the pole assembly 1 comprising a first cover plate 14, a pole 11 and a pole connecting piece 12, the pole connecting piece 12 is used for welding a pole ear, a first pole mounting hole 141 is provided on the first cover plate 14, a second pole mounting hole 121 is provided on the pole connecting piece 12 at a position corresponding to the first pole mounting hole 141, the pole connecting piece 12 is provided with an annular step groove 1211 at an outer peripheral position of one end of the second pole mounting hole 121 away from the first cover plate 14, the pole 11 passes through the first pole mounting hole 141 and the end of the pole 11 is located in the second pole mounting hole 121, and a weld is formed at a position where the inner wall of the second pole mounting hole 121 at one end away from the first cover plate 14 contacts the pole 11;

[0032] The weld seals the joint between the pole 11 and the pole connecting piece 12 , and the pole 11 and the weld do not protrude from a side of the pole connecting piece 12 away from the first cover plate 14 .

[0033] It should be noted that most battery metal structural parts are connected by welding. During the welding process, welds are inevitably formed between the groove surfaces of the structural parts or between the groove surface of one structural part and the surface of another structural part. The welds are uneven, affecting the flatness of the connection surface of the structural parts.

[0034] The weld seals the joint between the pole 11 and the pole connecting piece 12. The pole 11 and the weld do not extend beyond the side of the pole connecting piece 12 that is away from the first cover plate 14. This arrangement is conducive to forming a flat welding surface at the position of the pole 11 and the pole connecting piece 12, improving the welding quality of the pole connecting piece 12 and other electrical connectors, reducing the impedance of the welding position, and thus improving the overall performance of the power battery.

[0035] Specifically, in the present application, the pole connecting piece 12 is provided with the annular step groove 1211 at the outer peripheral position of one end of the second pole mounting hole 121 away from the first cover plate 14, the pole 11 passes through the first pole mounting hole 141 and the end of the pole 11 is located in the second pole mounting hole 121, at this time, the inner wall of the second pole mounting hole 121 is welded to the contact position of the pole 11 to form a weld, and the weld is used to seal the joint between the pole 11 and the pole connecting piece 12, thereby improving the connection between the pole connecting piece 12 and the The connection strength and sealing performance between the poles 11; in addition, since the pole 11 and the weld do not exceed the side of the pole connecting piece 12 away from the first cover plate 14 and the annular step groove 1211, the side of the pole connecting piece 12 away from the first cover plate 14 is used as the welding area of ​​other structural parts in the structure, and a flat welding surface can be formed, which solves the adverse effect of the protruding height of the weld on the surface flatness of the pole connecting piece 12, improves the welding quality of the pole connecting piece 12 and the external electrical connector, and reduces the impedance of the welding position.

[0036] In one embodiment, the pole assembly 1 further comprises a pole pressing plate 13 , on which a third pole mounting hole 131 is provided, and one end of the pole 11 away from the pole connecting plate 12 is connected to the third pole mounting hole 131 .

[0037] Specifically, the purpose of setting the third pole mounting hole 131 on the pole pressure plate 13 is to assemble with the pole 11. Connecting the end of the pole 11 away from the pole connecting piece 12 to the third pole mounting hole 131 is beneficial to improving the overall connection strength of the pole assembly 1, thereby improving the electrical performance of the assembled battery.

[0038] In one embodiment, the first cover plate 14 and the pole pressing plate 13 are stacked, and the first cover plate 14 is disposed between the pole piece pressing plate and the pole connecting piece 12 .

[0039] In one embodiment, the pole assembly 1 also includes an insulating sheet, which includes a first insulating sheet 15 and a second insulating sheet 16, wherein the first insulating sheet 15 is arranged between the first cover plate 14 and the pole pressure plate 13, and the second insulating sheet 16 is arranged between the first cover plate 14 and the pole connecting plate 12.

[0040] Specifically, the first cover plate 14, the second cover plate 3, the pole pressure plate 13 and the pole connecting plate 12 are generally made of metal (which may be aluminum and its alloys, magnesium and its alloys, iron and its alloys, nickel and its alloys or copper and its alloys, etc.), and the purpose of providing the insulating sheet is to insulate multiple adjacent metal parts in the pole assembly 1 to avoid short circuit;

[0041] In specific operation, the first insulating sheet 15 is arranged between the first cover plate 14 and the pole pressure plate 13, which can isolate the direct contact between the pole pressure plate 13 and the first cover plate 14. The second insulating sheet 16 is arranged between the first cover plate 14 and the pole connecting plate 12 to isolate the direct contact between the first cover plate 14 and the pole connecting plate 12 to avoid short circuit.

[0042] In one embodiment, a plurality of pole mounting holes are formed on the first insulating sheet 15 and the second insulating sheet 16 , and the plurality of pole mounting holes correspond to the positions of the first pole mounting holes 141 .

[0043] In one embodiment, the battery cover 100 further includes a partition 2 , the partition 2 is provided with a groove 21 , and the pole connecting piece 12 is disposed in the groove 21 .

[0044] Specifically, the partition 2 is made of insulating material, and the partition 2 and the second cover plate 3 can be separately provided, or the partition 2 and the second cover plate 3 can be connected as one; the partition 2 serves to block the battery cell to prevent the tab from directly contacting the second cover plate 3 and / or the battery housing; since the second cover plate 3 is made of metal material, the plastic plate can serve as an insulator to avoid electrical connection between the second cover plate 3 and the battery cell; Figure 5 The groove 21 abuts against the surface of the battery cell, thereby preventing the battery cell from being displaced inside the shell.

[0045] In one embodiment, the groove 21 is sunken from one surface of the partition plate 2 to the other surface, and a protrusion 22 is formed on the other surface of the partition plate 2 .

[0046] Specifically, refer to Figure 4 The groove 21 is recessed from one side of the partition 2 to the other side, and the protrusion 22 is formed on the other side of the partition 2. Since the protrusion 22 directly abuts against the battery cell, it is beneficial to improve the looseness and displacement of the battery cell after it is placed in the shell, thereby ensuring the stability of the connection between the internal structural parts of the battery.

[0047] In one embodiment, a baffle 23 is provided at the bottom of the groove 21 , and the baffle 23 divides the groove 21 into a plurality of through holes 24 , which are used for the pole tabs to pass through the through holes 24 and be welded to the pole connecting piece 12 .

[0048] Specifically, during battery assembly, at least part of the pole connecting piece 12 is placed in the groove 21. At this time, the groove 21 needs to bear at least part of the weight of the pole assembly 1. The battery cover 100 is pressed down during battery assembly, and the groove 21 needs to bear more weight. A baffle 23 is provided at the bottom of the groove 21 to absorb gravity and avoid the battery cover 100 from squeezing the battery cell. In addition, the pole ear is welded to the pole connecting piece 12. The through hole 24 formed by the baffle 23 can be used for the pole ear to pass through, so as to achieve welding of the pole ear and the pole connecting piece 12.

[0049] In one embodiment, the battery cover plate 100 further includes a second cover plate 3 , on which a mounting hole 31 and a liquid injection hole 32 are provided, and the second cover plate 3 is embedded in the mounting hole 31 .

[0050] Specifically, refer to Figure 6 The first cover plate 14 and the second cover plate 3 are arranged on the battery cover plate 100, and the pole assembly 1 is adapted and installed with the mounting hole 31 on the second cover plate 3 to form the battery cover plate 100, which is used to close the battery shell to form a battery; further, the second cover plate 3 is also provided with an injection hole 32, and the electrolyte is injected through the injection hole 32. After the injection or formation is completed, the injection port is closed. The specific sealing method can be sealed by welding the battery cover plate 100.

[0051] In one embodiment, there are a plurality of poles 11 , and the plurality of poles 11 are arranged in the pole assembly 1 .

[0052] It should be noted that in conventional operation, one end of the pole is connected to the bus bar, and the other end is connected to an external conductor or to one pole of a single battery.

[0053] During the normal charging and discharging process of the battery, it generally goes through ion deintercalation, the diaphragm and electrolyte reach the negative electrode, and then repeats this process from the negative electrode to the positive electrode. During the entire working process, the battery will encounter resistance, which in turn affects the battery's large current discharge and affects the battery's electrical performance.

[0054] If the battery is provided with a plurality of poles 11, during charging and discharging, the current is charged and discharged through the plurality of poles 11, which is equivalent to current shunting, and is beneficial to improving the rate performance of the battery.

[0055] Specifically, in the utility model, a plurality of poles 11 are arranged on the pole assembly 1 to meet the requirement of high impedance of the battery and at the same time help to improve the overall performance of the battery.

[0056] In another embodiment of the present application, the number of the poles 11 can be a single pole. Specifically, on the basis of ensuring the current carrying capacity, a single pole 11 is set to be welded with the pole connecting piece 12. At this time, the end of the single pole 11 is still abutted against the annular step groove 1211 in the pole connecting piece 12, so that the weld formed by welding does not protrude from the side of the pole connecting piece 12 away from the first cover plate 14, and thus does not affect the welding of the pole connecting piece 12 and the pole ear 5.

[0057] Reference Figure 7 In another example, the present application provides a battery, including a battery cell 4, a tab 5, a shell 6 and the battery cover 100, wherein the tab 5 is arranged at the end of the battery cell 4, the battery cell 4 is placed in the shell 6, and the battery cover 100 closes the shell 6.

[0058] Specifically, the battery provided in the present application includes the battery cover 100, wherein the pole connecting piece 12 in the battery cover 100 is provided with the annular step groove 1211 at the outer peripheral position of one end of the second pole mounting hole 121 away from the first cover 14, the pole 11 passes through the first pole mounting hole 141 and the end of the pole 11 is located in the second pole mounting hole 121, at this time, the inner wall of the second pole mounting hole 121 is welded to the contact position of the pole 11 to form a weld, and the weld is used to seal the joint between the pole 11 and the pole connecting piece 12, thereby improving the connection between the pole connecting piece 1 2 and the connection strength and sealing performance between the pole 11; in addition, since the pole 11 and the weld do not exceed the side of the pole connecting piece 12 away from the first cover plate 14 and the annular step groove 1211, the side of the pole connecting piece 12 away from the first cover plate 14 is used as the welding area of ​​other structural parts in the structure, and a flat welding surface can be formed, which solves the adverse effect of the protruding height of the weld on the surface flatness of the pole connecting piece 12, improves the welding quality of the pole connecting piece 12 and the external electrical connector, and reduces the impedance of the welding position, which is beneficial to improve the overall electrical performance of the battery.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: A pole assembly is included, the pole assembly includes a first cover plate, a pole and a pole connecting piece, the pole connecting piece is used for welding a pole ear, a first pole mounting hole is provided on the first cover plate, a second pole mounting hole is provided on the pole connecting piece at a position corresponding to the first pole mounting hole, an annular step groove is provided on the pole connecting piece at an outer peripheral position of one end of the second pole mounting hole away from the first cover plate, the pole passes through the first pole mounting hole and the end of the pole is located in the second pole mounting hole, and a weld is formed at a position where the inner wall of the second pole mounting hole away from the first cover plate contacts the pole; The weld seals the joint between the pole and the pole connecting piece, and the pole and the weld do not protrude from a side of the pole connecting piece that is away from the first cover plate.

2. A battery cover according to claim 1, characterized in that: The pole assembly further comprises a pole pressing plate, on which a third pole mounting hole is arranged, and one end of the pole away from the pole connecting plate is connected to the third pole mounting hole.

3. A battery cover according to claim 2, characterized in that: The first cover plate is stacked with the pole pressing plate, and the first cover plate is arranged between the pole pressing plate and the pole connecting piece.

4. A battery cover according to claim 2, characterized in that: The pole assembly further includes an insulating sheet, which includes a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is arranged between the first cover plate and the pole pressure plate, and the second insulating sheet is arranged between the first cover plate and the pole connecting sheet.

5. A battery cover according to claim 1, characterized in that: The battery cover plate further comprises a partition plate, the partition plate is provided with a groove, and the pole connecting piece is arranged in the groove.

6. A battery cover according to claim 5, characterized in that: The groove is sunken from one surface of the partition toward the other surface, and a convex portion is formed on the other surface of the partition.

7. A battery cover according to claim 5, characterized in that: A baffle is provided at the bottom of the groove, and the baffle divides the groove into a plurality of through holes, which are used for the pole lug to pass through the through holes and be welded to the pole connecting piece.

8. The battery cover according to claim 1, characterized in that: The battery cover plate further comprises a second cover plate, on which a mounting hole and a liquid injection hole are arranged, and the first cover plate is embedded in the mounting hole.

9. A battery cover according to claim 1, characterized in that: There are multiple poles, and the multiple poles are arranged in the pole assembly.

10. A battery, characterized in that: It comprises a battery cell, a tab, a shell and the battery cover plate according to any one of claims 1 to 9, wherein the tab is arranged at the end of the battery cell, the battery cell is placed in the shell, and the battery cover plate closes the shell.

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