Top cover of battery and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover of a battery and the battery, and the top cover comprises a cover plate main body, a pole and an adapter piece, the adapter plate is in insulated connection with the cover plate main body, a through lead-out hole is formed in the adapter plate, a tab led out from a battery cell penetrates through the lead-out hole, and one surface, opposite to the battery cell, of the adapter plate is used for being connected with the tab; the pole column is connected to one surface, back on to the battery cell, of the adapter plate and is used for covering the tab, and a fuse structure is arranged on the adapter plate; according to the scheme, the switching piece has the function of allowing the tab of the battery cell to penetrate out and the function of automatic circuit breaking at high temperature at the same time, more height space can be vacated for the battery cell to use, when the temperature of the pole and the switching piece is too high due to short circuit of the battery, the fuse structure can be fused in time, and the service life of the battery is prolonged. Therefore, the connection between the tab and the pole of the battery cell is automatically disconnected, and the use safety of the battery is improved.

Description

Technical Field

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

[0002] The current battery shell includes a shell and a top cover, wherein the battery cell is housed in the shell, and the top cover is used to seal the opening on the shell. The top cover is also used to lead out the positive or negative electrode of the battery cell. Specifically, the existing top cover usually includes a pole, a lower plastic part and an adapter. The tabs currently led out of the battery cell are welded to the bottom of the pole through the adapter. When the welding is completed and the top cover seals the opening of the shell, the tab will bend and occupy a part of the space inside the shell. That is, there is a gap between the top surface of the battery cell and the bottom surface of the top cover for the tab to bend. This gap leads to a waste of internal space in the battery, which results in the battery's power under a certain volume being limited, making it impossible to improve the battery's energy density. In addition, the poles on the current top cover are more protruding and occupy more height space, which also leads to a waste of internal space in the shell, thereby further limiting the battery's power under a certain volume.

[0003] Therefore, there is a need to improve the existing technology.

[0004] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0005] The utility model provides a battery top cover and a battery, which mainly solves the technical problem in the prior art that the battery has low energy density due to low available space rate of the battery core.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A top cover of a battery comprises a cover body, a pole and an adapter; the adapter is insulated and connected to the cover body, a through lead-out hole is provided on the adapter, the lead-out hole is used to allow the pole tab led out of the battery cell to pass through, the side of the adapter facing away from the battery cell is used for connection to the pole tab, the pole is connected to the side of the adapter facing away from the battery cell and is used to cover the pole tab, and a fuse structure is provided on the adapter.

[0008] In one of the technical solutions, the adapter plate includes a tab connection portion and a pole connection portion arranged around the tab connection portion, the tab connection portion is provided with the lead-out hole, the side of the tab connection portion facing away from the battery cell is used for connection to the tab, the pole connection portion is used to be connected to the pole, and at least one fuse structure is connected between the tab connection portion and the pole connection portion.

[0009] In one of the technical solutions, a through hole is provided between the tab connection portion and the pole connection portion, and the through hole divides the adapter into the tab connection portion, the pole connection portion and the fuse structure.

[0010] In one of the technical solutions, the adapter plate is provided with a through hole on both opposite sides of the lead-out hole, and the two ends of the lead-out hole in the length direction are respectively a first end and a second end, one end of the two through holes is close to the first end, and the other end of the two through holes is close to the second end, so that the fuse structure is formed at the adjacent position of the first end and the adjacent position of the second end of the lead-out hole.

[0011] In one of the technical solutions, the adapter plate is provided with a through hole on the periphery of the lead-out hole, and the two ends of the lead-out hole in the length direction are respectively a first end and a second end, the first end is connected to the through hole, and the head end and the tail end of the through hole are both close to the second end, so that the fuse structure is formed at the adjacent position of the second end.

[0012] In one of the technical solutions, a groove is provided on one side of the pole facing the adapter plate, a raised step portion is formed on the periphery of the groove, the step portion is connected to the pole connecting portion, and the groove and the adapter plate are jointly formed to form a protective space for covering the pole ear.

[0013] In one of the technical solutions, a boss is provided on the pole connecting portion, which protrudes in a direction away from the battery cell, so that the inner circle of the boss forms a recessed groove, and at least part of the pole is embedded in the recessed groove, and the groove wall of the groove and the groove wall of the recessed groove are jointly enclosed to form the protective space.

[0014] In one technical solution, an insulating member is connected between the cover plate body and the pole. The insulating member is a ring-shaped structure with a central hole in the middle. At least part of the adapter plate and at least part of the pole are accommodated in the central hole.

[0015] In one technical solution, the top of the insulating member is provided with a first hole position that is open upward, and the bottom of the insulating member is provided with a second hole position that is open downward, the first hole position and the second hole position are connected to each other to form the central hole, and the hole diameter of the second hole position is smaller than that of the first hole position, so that a support portion is formed below the first hole position and is arranged outside the second hole position;

[0016] At least a portion of the adapter plate and at least a portion of the pole are both received in the first hole, and the adapter plate abuts against the top surface of the support portion.

[0017] The present solution also provides a battery, which includes a shell, a battery cell and the top cover described in the above technical solution. The shell is provided with an opening, the battery cell is loaded into the shell through the opening, the cover body seals the opening, and a tab is led out from the battery cell, the tab passes through the lead-out hole and is connected to the side of the adapter facing away from the battery cell.

[0018] Compared with the prior art, the battery top cover provided by the present invention has at least the following beneficial effects:

[0019] During assembly, the present solution allows the tabs on the cell to be passed through the lead-out holes on the adapter sheet and connected to the side of the adapter sheet facing away from the cell (which can be understood as the top surface of the adapter sheet). The poles are then welded to the top surface of the adapter sheet and the tabs are covered. With this solution, after the tabs and the top cover are connected and the top cover is sealed to the housing, there is no need to reserve too much space between the top surface of the cell and the bottom surface of the top cover for the tabs to bend, thereby freeing up more height space for the cell to utilize. That is, the cell can be made taller and closer to the bottom surface of the top cover, thereby increasing the amount of power the battery can hold under a certain volume and increasing the energy density of the battery.

[0020] In addition, a fuse structure is also provided on the adapter plate of the present solution, that is, the adapter plate of the present solution has both the function of allowing the tabs of the battery cell to pass through and the function of automatically disconnecting the circuit at high temperatures. When a short circuit occurs in the battery and causes the temperature on the pole and the adapter plate to be too high, the fuse structure can be blown in time to automatically disconnect the connection between the tabs and the poles of the battery cell, thereby improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a battery provided in an embodiment of the present application;

[0023] Figure 2 A top view of a battery provided in an embodiment of the present application;

[0024] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0025] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 5 An exploded view of the structure of a battery provided in an embodiment of the present application;

[0027] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0028] Figure 7 An exploded view of the structure of the top cover provided in an embodiment of the present application;

[0029] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0030] Figure 9 A schematic structural diagram of another adapter provided in an embodiment of the present application;

[0031] Figure 10 Another partial enlarged view of the top cover at the pole position provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1. Shell; 11. Opening; 2. Battery cell; 21. Tab;

[0034] 3. Top cover; 31. Cover body; 311. Opening; 32. Pole; 321. Groove; 322. Step; 33. Adapter; 331. Ear connection; 332. Pole connection; 333. Fuse structure; 334. Lead-out hole; 3341. First end; 3342. Second end; 335. Through hole; 336. Boss; 337. Recessed groove; 34. Insulator; 341. Middle hole; 342. First hole position; 343. Second hole position; 344. Support; 35. Protective space. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0040] Please also refer to Figures 1 to 8 An embodiment of the utility model provides a battery, including a shell 1, a battery cell 2 and a top cover 3, wherein the shell 1 is provided with an open opening 11, at least one battery cell 2 is loaded into the interior of the shell 1 through the opening 11, and the top cover 3 is used to seal the opening 11 to prevent foreign matter from entering the shell 1 through the opening 11, and a tab 21 is led out from the battery cell 2, and the tab 21 is connected to the top cover 3.

[0041] Specifically, the top cover 3 includes a cover body 31, a pole 32, a transition piece 33, and an insulating member 34. The cover body 31 is usually made of aluminum and is used to seal the aforementioned opening 11. The cover body 31 is provided with a through-hole 311, at which the pole 32 and transition piece 33 are both provided. The insulating member 34 insulates and separates the cover body 31 and the pole 32 to prevent the cover body 31 from becoming charged, thereby reducing the risk of a short circuit in the battery. The transition piece 33 is provided with a through-hole 334, which is used to allow the tab 21 on the battery cell 2 to pass upward. The side of the transition piece 33 facing away from the battery cell 2 (which can be understood as the top surface of the transition piece 33) is used for welding the tab 21. The pole 32 is welded to the side of the transition piece 33 facing away from the battery cell 2 and is used to cover the tab 21 to protect the tab 21 and prevent damage to the tab 21. In addition, a fuse structure 333 is also provided on the adapter plate 33 of this solution.

[0042] Specifically, during assembly, the present solution can allow the tab 21 led out of the battery cell 2 to pass through the lead-out hole 334 on the adapter plate 33 and be welded to the side of the adapter plate 33 facing away from the battery cell 2 (which can be understood as the top surface of the adapter plate 33). The pole 32 is then welded to the top surface of the adapter plate 33 and the tab 21 is covered. With the present solution, after the tab 21 and the top cover 3 are connected and the top cover 3 is sealed to the shell 1, no gap is required between the top surface of the battery cell 2 and the bottom surface of the top cover 3 for the tab 21 to bend, thereby freeing up more height space for the battery cell 2 to utilize. That is, the battery cell 2 can be made higher and closer to the bottom surface of the top cover 3, thereby increasing the amount of power the battery can hold under a certain volume and increasing the energy density of the battery. In addition, the adapter plate 33 of the present solution has both the function of allowing the tab 21 of the battery cell 2 to pass through and the function of automatically disconnecting the circuit at high temperatures. When a short circuit occurs in the battery and causes the temperature on the pole 32 and the adapter plate 33 to be too high, the fuse structure 333 can be blown in time to automatically disconnect the connection between the tab 21 of the battery cell 2 and the pole 32, thereby improving the safety of battery use.

[0043] Please also refer to Figures 5 to 8The adapter 33 specifically includes a tab connection portion 331 and a post connection portion 332. The post connection portion 332 is disposed around the tab connection portion 331 and has the aforementioned lead-out hole 334. The side of the tab connection portion 331 facing away from the battery cell 2 (i.e., the top surface of the tab connection portion 331) is used for welding the tab 21 of the battery cell 2. The post connection portion 332 is used for welding to the post 32. At least one fuse structure 333 is connected between the tab connection portion 331 and the post connection portion 332. When the fuse structure 333 automatically blows at high temperatures, the tab connection portion 331 located in the middle is disconnected from the post connection portion 332, thereby automatically disconnecting the battery. More specifically, the adapter plate 33 with this structural design can allow the tab 21 to pass through while also facilitating the arrangement of the above-mentioned fuse structure 333. This adapter plate 33 has the advantage of a compact structure. The adapter plate 33 with this structural design has a small external dimension and will not occupy too much space in the length direction of the cover plate body 31.

[0044] Please refer to the Figures 5 to 8 The adapter plate 33 is provided with at least one through hole 335 on the periphery of the lead-out hole 334 (it can also be understood that a through hole 335 is provided between the tab connection portion 331 and the pole connection portion 332). These through holes 335 divide the adapter plate 33 into the tab connection portion 331, the pole connection portion 332 and the fuse structure 333. Optionally, as Figure 6 As shown, the adapter plate 33 is provided with a through hole 335 on both sides of the lead-out hole 334, that is, a total of two through holes 335 are provided on the adapter plate 33, and the two ends of the lead-out hole 334 in the length direction are respectively a first end 3341 and a second end 3342, and one end of the two through holes 335 (preferably Figure 6 The right end of the through hole 335 is shown in FIG, and the left end of the through hole 335 can also be shown in other embodiments) is close to the first end 3341, and the other ends of the two through holes 335 (preferably Figure 6 The left end of the through hole 335 (shown in the figure, which may be the right end of the through hole 335 in other embodiments) is close to the second end 3342, so that the lead-out hole 334 forms a fuse structure 333 at a position adjacent to the first end 3341 and at a position adjacent to the second end 3342. With this structure of the adapter 33, when the tab 21 passes through the lead-out hole 334 and is divided into two equal strands welded to the top surface of the tab connection portion 331 using the lead-out hole 334 as a dividing line, the current flowing through the fuse structure 333 located adjacent to the end of the lead-out hole 334 will be more uniform. That is, the fuse structure 333 located adjacent to the end of the lead-out hole 334 will be heated more evenly when the battery is operating, and the accuracy of the fuse structure 333 melting at the preset temperature will be higher, so that a short-circuited battery can be disconnected in time.

[0045] In another embodiment, see Figure 9 The adapter plate 33 may also be provided with a through hole 335 on the periphery of the lead-out hole 334. The first end 3341 of the lead-out hole 334 is connected to the through hole 335. The leading and trailing ends of the through hole 335 are both close to the second end 3342 of the lead-out hole 334, so that the lead-out hole 334 forms a fuse structure 333 adjacent to the second end 3342. Since the adapter plate 33 of this structural design has only one fuse structure 333, and this fuse structure 333 is also located adjacent to the end of the lead-out hole 334, the adapter plate 33 of this scheme is more likely to disconnect the connection between the pole 32 and the battery cell 2 at a predetermined high temperature compared to the adapter plate 33 in the previous section.

[0046] Please also refer to Figure 4 and Figure 8 The side of the pole 32 facing the adapter 33 (which can be understood as the bottom surface of the pole 32) is provided with a groove 321, and a raised step portion 322 is formed on the periphery of the groove 321. The step portion 322 is welded to the pole connecting portion 332. The groove 321 and the top surface of the adapter 33 are jointly formed to form a protective space 35 for covering the pole lug 21. The pole 32 of this embodiment preferably covers the adapter 33 below, so the through-type welding technology can be used to weld the pole 32 and the adapter 33. In other embodiments, the bottom surface of the pole 32 can be designed to be flat, and then a groove is provided on the top of the adapter 33. In this case, the purpose of the pole 32 and the top surface of the adapter 33 jointly forming the protective space 35 can also be achieved.

[0047] See also Figure 10 A boss 336 is provided on the pole connecting portion 332, which protrudes in a direction away from the battery cell 2 (i.e., upward), so that the inner circle of the pole connecting portion 332 forms a recessed groove 337, and at least a portion of the pole 32 is embedded in the recessed groove 337. In fact, the groove wall of the groove 321 of the pole 32 and the groove wall of the recessed groove 337 are jointly enclosed to form the above-mentioned protective space 35. At this time, the adapter 33 can be exposed upward, so that the boss 336 and the pole 32 can be welded together by traditional surface welding methods, thereby realizing the connection between the pole 32 and the adapter 33.

[0048] Please also refer to Figure 4 、 Figure 6 、 Figure 8 and Figure 10In this solution, the insulating member 34 between the pole 32 and the cover body 31 is an annular structure with a central hole 341 in the middle. At least part of the adapter 33 and at least part of the pole 32 are accommodated in the central hole 341. Preferably, the top surface of the pole 32, the top surface of the cover body 31 and the top surface of the insulating member 34 are designed to be flush. Through such a design, when the battery height is fixed, more height space can be freed up for the battery cell 2, which is conducive to further improving the battery power and energy density. Specifically, the top of the insulating member 34 is provided with a first hole position 342 that is open upward, and the bottom of the insulating member 34 is provided with a second hole position 343 that is open downward. The first hole position 342 and the second hole position 343 are connected to each other to jointly form the above-mentioned middle hole 341. Moreover, the aperture of the second hole position 343 is smaller than the aperture of the first hole position 342, so that a support portion 344 is formed below the first hole position 342 and is arranged around the outside of the second hole position 343. In fact, at least part of the above-mentioned adapter 33 and at least part of the pole 32 are both accommodated in the first hole position 342, and the second hole position 343 is mainly used to avoid the pole ear 21 so that the pole ear 21 can pass through the second hole position 343. The second hole 343 is welded to the adapter plate 33, wherein the pole connecting portion 332 of the adapter plate 33 abuts against the top surface of the support portion 344, so that the adapter plate 33 and the pole 32 will not collapse downward as a whole after being installed on the cover plate body 31, thereby preventing the adapter plate 33 from contacting the top surface of the battery cell 2, reducing the risk of short circuit of the battery; at the same time, by providing the support portion 344, there is more contact area between the insulating part 34 and the adapter plate 33, which is conducive to further improving the sealing between the insulating part 34 and the adapter plate 33, reducing the risk of foreign matter entering the battery, and reducing the risk of electrolyte leakage.

[0049] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.

Claims

1. A battery top cover, characterized in that: The invention comprises a cover plate body (31), a pole (32) and an adapter plate (33); the adapter plate (33) is insulated and connected to the cover plate body (31); a lead-out hole (334) is provided on the adapter plate (33); the lead-out hole (334) is used for allowing the pole lug (21) led out from the battery core (2) to pass through; a side of the adapter plate (33) facing away from the battery core (2) is used for connection with the pole lug (21); the pole (32) is connected to a side of the adapter plate (33) facing away from the battery core (2) and is used to cover the pole lug (21); and a fuse structure (333) is provided on the adapter plate (33).

2. The top cover of the battery according to claim 1, wherein: The adapter plate (33) comprises a tab connection portion (331) and a pole connection portion (332) arranged around the tab connection portion (331); the tab connection portion (331) is provided with the lead-out hole (334); the tab connection portion (331) is used for connection with the tab (21); the pole connection portion (332) is used for connection with the pole (32); and at least one fuse structure (333) is connected between the tab connection portion (331) and the pole connection portion (332).

3. The top cover of the battery according to claim 2, wherein: A through hole (335) is provided between the tab connection portion (331) and the pole connection portion (332), and the through hole (335) enables the adapter plate (33) to be divided into the tab connection portion (331), the pole connection portion (332), and the fuse structure (333).

4. The top cover of the battery according to claim 3, wherein: The adapter plate (33) is provided with a through hole (335) on both sides opposite to the lead-out hole (334), and the two ends of the lead-out hole (334) in the length direction are respectively a first end (3341) and a second end (3342), one end of the two through holes (335) is close to the first end (3341), and the other end of the two through holes (335) is close to the second end (3342), so that the fuse structure (333) is formed at the adjacent position of the first end (3341) and the adjacent position of the second end (3342) of the lead-out hole (334).

5. The top cover of the battery according to claim 3, wherein: The adapter plate (33) is provided with the through hole (335) on the periphery of the lead-out hole (334), and the two ends of the lead-out hole (334) in the length direction are respectively a first end (3341) and a second end (3342), the first end (3341) is connected to the through hole (335), and the head end and the tail end of the through hole (335) are both close to the second end (3342), so that the fuse structure (333) is formed at a position adjacent to the second end (3342).

6. The top cover of the battery according to claim 2, wherein: A groove (321) is provided on one side of the pole (32) facing the adapter plate (33), a raised step portion (322) is formed on the periphery of the groove (321), the step portion (322) is connected to the pole connecting portion (332), and the groove (321) and the adapter plate (33) are jointly formed to form a protective space (35) for covering the pole lug (21).

7. The top cover of the battery according to claim 6, wherein: The pole connecting portion (332) is provided with a boss (336) protruding in a direction away from the battery cell (2), so that the inner circle of the boss (336) forms a recessed groove (337), at least part of the pole (32) is embedded in the recessed groove (337), and the groove wall of the groove (321) and the groove wall of the recessed groove (337) are jointly enclosed to form the protective space (35).

8. The top cover of the battery according to any one of claims 1 to 7, characterized in that: An insulating member (34) is connected between the cover plate body (31) and the pole (32). The insulating member (34) is an annular structure with a central hole (341) provided in the middle. At least a portion of the adapter plate (33) and at least a portion of the pole (32) are both accommodated in the central hole (341).

9. The top cover of the battery according to claim 8, wherein: The top of the insulating member (34) is provided with a first hole (342) that is open upward, and the bottom of the insulating member (34) is provided with a second hole (343) that is open downward. The first hole (342) and the second hole (343) are interconnected to form the central hole (341). The diameter of the second hole (343) is smaller than that of the first hole (342), so that a support portion (344) is formed below the first hole (342) and is arranged outside the second hole (343). At least a portion of the adapter plate (33) and at least a portion of the pole (32) are both accommodated in the first hole (342), and the adapter plate (33) abuts against the top surface of the support portion (344).

10. A battery, characterized in that: The invention comprises a shell (1), a battery cell (2) and a top cover (3) according to any one of claims 1 to 9, wherein the shell (1) is provided with an opening (11), the battery cell (2) is loaded into the shell (1) through the opening (11), the cover body (31) seals the opening (11), a tab (21) is led out from the battery cell (2), the tab (21) passes through the lead-out hole (334) and is connected to a side of the adapter (33) facing away from the battery cell (2).

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