Battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery. The battery comprises a battery shell, an end cover and a first cover plate assembly, wherein a first opening and a second opening are respectively formed in two ends of the battery shell in a first direction; the end cover seals the first opening; the end cover is provided with a mounting hole; the first cover plate assembly comprises a first cover plate and a first pole arranged on the first cover plate, at least part of the first cover plate is located in the mounting hole, the outer peripheral wall of the first cover plate and the inner peripheral wall of the mounting hole are tightly attached to form a connecting seam, and a welding groove is formed in the end, away from the interior of the battery shell, of the connecting seam; the first cover plate and the end cover are welded, and a welding seam formed by welding the first cover plate and the end cover is contained in the welding groove. According to the battery, the manufacturing cost of the battery can be reduced, the energy density of the battery can be improved, and the production yield of the battery can also be improved.

Description

Technical Field

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

[0002] At present, the assembly process of blade batteries usually involves welding the pole ear on one side to the cover plate on one side, and then using a bracket to fix the core package at the other end, and then wrapping the Mylar film and then inserting it into the shell. After the shell is inserted, the pole ear on the other side is welded to the cover plate on the other side, and finally the two cover plates on both sides are welded and fixed to the shell. After the shell insertion process is completed, due to the obstruction of the shell, the length of the pole ear on the other side needs to be made longer before it can be welded on the cover plate, and then the cover plate can be bent and welded to the shell. However, the above-mentioned process in the prior art increases the cost of the fluid foil for making the pole ear on the one hand, and on the other hand, because the longer pole ear requires more accommodation space, the energy density of the battery cell is reduced; and the long pole ear is not convenient for shaping, which easily causes the pole ear to be inserted and cause the battery cell to short-circuit; at the same time, the assembly method of the above process uses a large number of parts, for example, an additional mounting bracket is required for installation, the process is relatively complicated, and the manufacturing cost is also high.

[0003] Therefore, there is an urgent need to provide a new type of battery to solve the above technical problems in the prior art. Utility Model Content

[0004] The utility model aims to provide a battery, which can reduce the manufacturing cost of the battery, improve the energy density of the battery, and also improve the production yield of the battery.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The battery comprises a battery shell, an end cover and a first cover plate assembly, wherein the battery shell is respectively provided with a first opening and a second opening at both ends in a first direction; the end cover seals the first opening; the end cover is provided with a mounting hole; the first cover plate assembly comprises a first cover plate and a first pole arranged on the first cover plate, at least a portion of the first cover plate is located in the mounting hole, the outer peripheral wall of the first cover plate and the inner peripheral wall of the mounting hole are tightly attached to form a connection seam, and a welding groove is provided at one end of the connection seam away from the interior of the battery shell; the first cover plate and the end cover are welded, and the weld formed by welding the first cover plate and the end cover is accommodated in the welding groove.

[0007] Optionally, the cross-sectional shape of the welding groove is V-shaped, U-shaped, semicircular, rectangular, trapezoidal or dovetail-shaped, wherein the cross-sectional shape of the welding groove is parallel to the first direction.

[0008] Optionally, the groove depth of the above-mentioned welding groove is a, and the groove width of the above-mentioned welding groove is b, wherein 0.2mm≤a≤0.5mm, 0.8mm≤b≤1.8mm.

[0009] Optionally, the mounting hole comprises a first hole segment, a second hole segment and a third hole segment which are sequentially connected along a first direction, and the hole wall of the third hole segment is connected to the hole wall of the second hole segment via a step surface; the projection of the second hole segment on the projection surface is located within the projection of the third hole segment on the projection surface, and the projection of the second hole segment on the projection surface is located within the projection of the first hole segment on the projection surface, wherein the projection surface is perpendicular to the first direction; the third hole segment is closer to the interior of the battery casing than the second hole segment; the first cover plate comprises a first part, a second part and a third part which are sequentially connected, and at least a part of the third part is accommodated in the third hole segment and abuts against the step surface; the second part is accommodated in the second hole segment, and the welding groove is formed between the outer peripheral wall of the first part and the hole wall of the first hole segment.

[0010] Optionally, the depth of the third hole section is g; the thickness of the first cover plate is f, wherein 0.3f≤g≤0.7f.

[0011] Optionally, a cross section of the second hole segment is trapezoidal, and the cross section of the second hole segment is parallel to the first direction.

[0012] Optionally, the width of the end cover along its width direction is c, and the width of the first cover plate along the width direction of the end cover is d, wherein 0.8c≤d≤c-4mm; the length of the end cover along its length direction is h, and the length of the first cover plate along the length direction of the end cover is i, wherein d≤i≤h-4mm.

[0013] Optionally, a sealing ring is provided in the connecting seam.

[0014] Optionally, the first cover plate assembly further includes a first insulating member, a side surface of the end cover close to the interior of the battery housing is fitted with the first insulating member, and the first insulating member is provided with a first installation limit groove cooperating with the first cover plate.

[0015] Optionally, the first cover plate assembly further includes a second insulating member, and a second mounting limit groove is provided on a side surface of the first cover plate away from the interior of the battery housing; the second insulating member is provided in the second mounting limit groove.

[0016] Beneficial effects:

[0017] The end cover of the battery in the utility model is used to seal the first opening of the battery shell, and a mounting hole is provided on the end cover, in which at least a part of the first cover plate assembly is arranged, and the first cover plate assembly includes a first cover plate, on which a first pole conductively connected to the outside is arranged; a connection seam is formed between the first cover plate and the mounting hole, and a welding groove is arranged at a section of the connection seam away from the interior of the battery, and when the first cover plate and the end cover are welded, the weld is accommodated in the welding groove, and the welding groove can also accommodate part of the volume of the metal expanded due to the heat generated by welding, thereby avoiding the appearance of bulges at the welding point. When manufacturing the battery, there is no need to make the cell pole ear connected to the first pole too long, and thus there is no need to set up additional space to accommodate the bent pole ear, which can reduce the manufacturing cost of the battery, improve the energy density of the battery, and also simplify the steps of pole ear shaping, thereby improving the production yield of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric view of a cover plate assembly provided in a specific embodiment of the utility model;

[0019] Figure 2 It is a longitudinal cross-sectional view of a cover plate assembly provided in a specific embodiment of the utility model;

[0020] Figure 3 In an optional embodiment of the utility model Figure 2 A partial enlarged view of the middle A;

[0021] Figure 4 In another optional embodiment of the utility model Figure 2 A partial enlarged view of the middle A;

[0022] Figure 5 It is a longitudinal cross-sectional view from another perspective of the cover plate assembly provided by the specific embodiment of the utility model.

[0023] In the figure:

[0024] 100, end cover; 101, injection hole; 110, step surface; 111, welding groove; 120, first insulating member; 121, first installation limit groove; 122, second insulating member; 131, first hole section; 132, second hole section; 133, third hole section;

[0025] 200, first cover plate; 201, sealing ring; 210, second installation limit groove; 221, first part; 222, second part; 223, third part;

[0026] 300. First pole. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Please refer to Figures 1 to 3In this embodiment, the battery includes a battery shell, an end cover 100 and a first cover plate assembly, and the two ends of the battery shell in the first direction are respectively provided with a first opening and a second opening; the end cover 100 seals the first opening; the end cover 100 is provided with a mounting hole; the first cover plate assembly includes a first cover plate 200 and a first pole 300 arranged on the first cover plate 200, at least a portion of the first cover plate 200 is located in the mounting hole, the outer peripheral wall of the first cover plate 200 and the inner peripheral wall of the mounting hole are tightly attached to form a connection seam, and a welding groove 111 is provided at one end of the connection seam away from the interior of the battery shell; the first cover plate 200 and the end cover 100 are welded, and the weld formed by welding the first cover plate 200 and the end cover 100 is accommodated in the welding groove 111.

[0032] The end cap 100 of the battery in this embodiment is used to seal the first opening of the battery shell, and a mounting hole is provided on the end cap 100, in which at least part of the first cover plate assembly is arranged, and the first cover plate assembly includes a first cover plate 200, on which a first pole 300 conductively connected to the outside is arranged; a connection seam is formed between the first cover plate 200 and the mounting hole, and a welding groove 111 is arranged at a section of the connection seam away from the inside of the battery, and when the first cover plate 200 and the end cap 100 are welded, the weld is accommodated in the welding groove 111, and the welding groove 111 can also accommodate part of the volume of the metal expanded due to the heat generated by welding, so as to avoid bulges at the welding point. When manufacturing the battery, there is no need to make the cell pole ear connected to the first pole 300 too long, so there is no need to set up additional space to accommodate the bent pole ear, which can reduce the manufacturing cost of the battery, improve the energy density of the battery, and simplify the steps of pole ear shaping, so as to improve the production yield of the battery.

[0033] The end cover 100 is also provided with a liquid injection hole 101 for injecting electrolyte, which will not be described in detail here.

[0034] Further, the cross-sectional shape of the welding groove 111 is V-shaped, U-shaped, semicircular, rectangular, trapezoidal, or dovetail-shaped, wherein the cross-sectional shape of the welding groove 111 is parallel to the first direction. The shape of the welding groove 111 is not specifically limited here, as long as it can accommodate the weld after welding. Specifically, in this embodiment, a rectangular shape is selected to facilitate the processing of the welding groove 111.

[0035] like Figure 3As shown, the groove depth of the welding groove 111 is a, and the groove width of the welding groove 111 is b, wherein 0.2mm≤a≤0.5mm, 0.8mm≤b≤1.8mm. The welding groove 111 configured in this way can not only be used to accommodate the weld, but also will not affect the mechanical strength of the first cover plate 200 and the end cover 100; the specific groove depth and groove width are selected by those skilled in the art according to specific needs, and are not specifically limited here.

[0036] Optionally, the mounting hole comprises a first hole segment 131, a second hole segment 132 and a third hole segment 133 which are sequentially connected along the first direction, and a hole wall of the third hole segment 133 and a hole wall of the second hole segment 132 are connected via a step surface 110; a projection of the second hole segment 132 on the projection plane is located within a projection of the third hole segment 133 on the projection plane, and a projection of the second hole segment 132 on the projection plane is located within a projection of the first hole segment 131 on the projection plane, wherein the projection plane is perpendicular to the first direction; The third hole section 133 is closer to the inside of the battery housing than the second hole section 132; the first cover plate 200 includes a first portion 221, a second portion 222 and a third portion 223 connected in sequence, at least part of the third portion 223 is accommodated in the third hole section 133 and abuts against the step surface 110; the second portion 222 is accommodated in the second hole section 132, and the welding groove 111 is formed between the outer peripheral wall of the first portion 221 and the hole wall of the first hole section 131. Thus, the second portion 222 of the first cover plate 200 can abut against the step surface 110 between the second hole section 132 and the third hole section 133, so that the first cover plate 200 is clamped in the mounting hole, realizing the connection between the first cover plate 200 and the mounting hole, and the assembly is simple and convenient, which can improve the production efficiency.

[0037] In this embodiment, the cross section of the second hole section 132 is trapezoidal, and the cross section of the second hole section 132 is parallel to the first direction. The second hole section 132 configured in this way can fit more closely with the second part 222, and can increase the contact area, thereby improving the sealing performance; at the same time, the trapezoidal cross section can improve the mechanical strength of the connection between the second hole section 132 and the second part 222.

[0038] like Figure 3 and Figure 4 As shown, optionally, a sealing ring 201 is provided in the above-mentioned connection seam. Specifically, if the cross section of the second hole section 132 is rectangular, the sealing ring 201 used is a sealing ring 201 with a rectangular cross section; if the cross section of the second hole section 132 is trapezoidal, the sealing ring 201 used is a sealing ring 201 with a circular cross section. The sealing ring 201 can further improve the sealing performance of the connection between the second hole section 132 and the second part 222, prevent electrolyte leakage, and improve the safety of the battery.

[0039] Furthermore, the first cover plate assembly further includes a first insulating member 120, and a side surface of the end cover 100 close to the inside of the battery housing is fitted with the first insulating member 120, and the first insulating member 120 is provided with a first installation limit groove 121 that cooperates with the first cover plate 200. The first insulating member 120 is a common lower plastic member, which can achieve insulation between the first pole 300 and the end cover 100 to prevent battery leakage; the first installation limit groove 121 can form a limit connection between the first insulating member 120 and the first cover plate 200, making it easier to position the first insulating member 120 during installation, and can also prevent the first insulating member 120 from shaking, thereby ensuring the structural strength and reliability of the battery.

[0040] As a preferred embodiment, the first cover plate assembly further includes a second insulating member 122, and a second mounting limit groove 210 is provided on a side surface of the first cover plate 200 away from the inside of the battery housing; the second insulating member 122 is provided in the second mounting limit groove 210. The second mounting limit groove 210 can not only realize the fiber fixing effect on the second insulating member 122 and the first pole 300, but also can accommodate part of the first pole 300 in the height direction, thereby reducing the height of the first pole 300, so that the height of the battery is reduced.

[0041] Please continue to refer to Figure 2 and 5 , the depth of the third hole section 133 is g; the thickness of the first cover plate 200 is f, wherein 0.3f≤g≤0.7f. Furthermore, 1mm≤f≤3mm. If the thickness of the matching section of the third hole section 133 and the first cover plate 200 is too small, it will be easily deformed and will not play a limiting role. If it is too large, the seam welding strength of the first cover plate 200 and the end cover 100 will be reduced. The depth of the third hole section 133 and the thickness of the first cover plate 200 can be determined according to the size of the battery and the required mechanical strength, and will not be described in detail in this embodiment.

[0042] Optionally, the width of the end cap 100 along its width direction is c, and the width of the first cover plate 200 along the width direction of the end cap 100 is d, wherein 0.8c≤d≤c-4mm; the length of the end cap 100 along its length direction is h, and the length of the first cover plate 200 along the length direction of the end cap 100 is i, wherein d≤i≤h-4mm. If the matching section is too small, the end cap 100 cannot limit the first cover plate 200; if the matching section is too wide, it is easy to deform due to its small thickness. The first cover plate 200 is at least 2mm away from the edge of the end cap 100, that is, d≤c-4mm, to ensure the rigidity of the aluminum sheet. In order to ensure the flow area of ​​the first pole 300, 0.8*c≤d. If the length i of the first cover plate 200 should be as small as possible while meeting the flow area of ​​the first pole 300 and the welding area of ​​the connecting row, this can reduce the circumference of the laser welding and improve the welding efficiency.

[0043] Furthermore, when c<20 mm, d=c-4 mm, thereby ensuring that the mechanical strength of the end cover 100 and the first cover plate 200 is not affected, and ensuring the safety and reliability of the battery.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized in that include: A battery housing, wherein two ends of the battery housing in a first direction are respectively provided with a first opening and a second opening; An end cover (100), the end cover (100) sealing the first opening; the end cover (100) is provided with a mounting hole; A first cover plate assembly, the first cover plate assembly comprising a first cover plate (200) and a first pole (300) arranged on the first cover plate (200), at least a portion of the first cover plate (200) being located in the mounting hole, an outer peripheral wall of the first cover plate (200) and an inner peripheral wall of the mounting hole being in close contact with each other to form a connection seam, and a welding groove (111) being arranged at one end of the connection seam away from the interior of the battery housing; the first cover plate (200) and the end cover (100) are welded, and a weld formed by welding the first cover plate (200) and the end cover (100) is accommodated in the welding groove (111).

2. The battery according to claim 1, characterized in that The cross-sectional shape of the welding groove (111) is V-shaped, U-shaped, semicircular, rectangular, trapezoidal, or dovetail-shaped, wherein the cross-sectional shape of the welding groove (111) is parallel to the first direction.

3. The battery according to claim 2, characterized in that The groove depth of the welding groove (111) is a, and the groove width of the welding groove (111) is b, wherein 0.2 mm ≤ a ≤ 0.5 mm, and 0.8 mm ≤ b ≤ 1.8 mm.

4. The battery according to claim 3, characterized in that The mounting hole comprises a first hole segment (131), a second hole segment (132) and a third hole segment (133) which are sequentially connected along a first direction, and the hole wall of the third hole segment (133) and the hole wall of the second hole segment (132) are connected via a step surface (110); the projection of the second hole segment (132) on the projection surface is located within the projection of the third hole segment (133) on the projection surface, and the projection of the second hole segment (132) on the projection surface is located within the projection of the first hole segment (131) on the projection surface, wherein the projection surface is perpendicular to the first direction; the third hole segment (133) is closer to the inside of the battery housing than the second hole segment (132); The first cover plate (200) comprises a first part (221), a second part (222) and a third part (223) which are connected in sequence, at least a part of the third part (223) is accommodated in the third hole section (133) and abuts against the step surface (110); the second part (222) is accommodated in the second hole section (132), and the welding groove (111) is formed between the outer peripheral wall of the first part (221) and the hole wall of the first hole section (131).

5. The battery according to claim 4, characterized in that The depth of the third hole section (133) is g; the thickness of the first cover plate (200) is f, wherein 0.3f≤g≤0.7f.

6. The battery according to claim 4, characterized in that The cross section of the second hole section (132) is trapezoidal, and the cross section of the second hole section (132) is parallel to the first direction.

7. The battery according to claim 1, characterized in that The width of the end cover (100) along its width direction is c, and the width of the first cover plate (200) along the width direction of the end cover (100) is d, wherein 0.8c≤d≤c-4mm; the length of the end cover (100) along its length direction is h, and the length of the first cover plate (200) along the length direction of the end cover (100) is i, wherein d≤i≤h-4mm.

8. The battery according to claim 1, characterized in that A sealing ring (201) is arranged in the connecting seam.

9. The battery according to claim 1, characterized in that The first cover plate assembly further comprises a first insulating member (120), a side surface of the end cover (100) close to the interior of the battery housing is fitted with the first insulating member (120), and the first insulating member (120) is provided with a first mounting limit groove (121) that cooperates with the first cover plate (200).

10. The battery according to claim 1, characterized in that The first cover plate assembly further comprises a second insulating member (122); a second mounting limit groove (210) is provided on a side surface of the first cover plate (200) away from the interior of the battery housing; and the second insulating member (122) is arranged in the second mounting limit groove (210).

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