Cover plate assembly of all-tab battery and all-tab battery

Abstract

The utility model provides a cover plate assembly of a full-tab battery and the full-tab battery, a connecting piece comprises a connecting piece body and a welding part, a protective sleeve and the connecting piece body are fixed on a cover plate, and the protective sleeve is positioned between the cover plate and the connecting piece body; one end of the connecting piece body extends towards the direction far away from the cover plate to form the welding part, the current collecting piece is welded on a full tab of a battery cell, the welding part is bent and then is welded with the current collecting piece, and the full tab is in large-area connection with the cover plate through the current collecting piece, the welding part of the connecting piece and the connecting piece body. The over-current sectional area can be greatly increased, the internal resistance of the battery is greatly reduced, heating is reduced, the safety performance is improved, the protective sleeve can prevent the connecting piece from mistakenly touching the cover plate or the shell to cause short circuit, and the safety performance is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a full tab battery's cover plate subassembly and full tab battery. BACKGROUND

[0002] At present, for the multi-tab battery, the multi-tab roll core and the cover plate are welded, and the tab is easy to break, the tab is virtual welded with the connecting piece, and the tab is re-welded. Not only the current-carrying area is reduced, but also the internal resistance of the welding position is increased, and then the internal resistance of the current collector is increased during high-rate discharge, and the battery is easy to heat and cause safety problems.

[0003] Therefore, it is necessary to provide a novel full tab battery cover plate assembly and full tab battery to overcome the above defects. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of full tab battery's cover plate subassembly and full tab battery, can increase welding area, make current-carrying cross-sectional area greatly increase, greatly reduce the internal resistance of battery, reduce heating and improve safety performance.

[0005] To achieve the above object, in a first aspect, the utility model provides a kind of full tab battery's cover plate subassembly, including cover plate, protective sleeve, connecting piece and current collector piece;The connecting piece includes connecting piece body and welding portion, the protective sleeve and the connecting piece body are fixed on the cover plate and the protective sleeve is located between the cover plate and the connecting piece body, one end of the connecting piece body extends to the direction away from the cover plate and forms the welding portion, the current collector piece is welded on the full tab of electric core, the welding portion is bent and welded with the current collector piece.

[0006] In a preferred embodiment, two current collector pieces are provided on the full tab, the two current collector pieces are opposite in position, and the edges of the current collector pieces wrap the full tab.

[0007] In a preferred embodiment, the welding portion is two, the two welding portions are bent towards the connecting piece body, and the two welding portions are respectively welded with the two current collector pieces.

[0008] In a preferred embodiment, the protective sleeve includes a plate body and two edges formed by extending the plate to both sides, the two edges are perpendicular to the plate body, the plate body is located between the cover plate and the connecting piece body, and the two edges are located on both sides of the connecting piece body.

[0009] In a preferred embodiment, it further includes an insulating bushing, the insulating bushing includes a fixed plate and an abutting plate connected to one end of the fixed plate, the fixed plate is fixed to one side of the connecting piece body away from the cover plate, and the abutting plate abuts the welding portion.

[0010] In a preferred embodiment, the fixing plate is provided with a protruding fixing frame on the side away from the connecting piece body.

[0011] In a preferred embodiment, a pole and a rivet are further included, and the rivet fixes the pole and the connecting piece body on the cover plate.

[0012] In a preferred embodiment, the cover plate includes an upper surface and a lower surface opposite to the upper surface, the pole is arranged on the upper surface, the connecting piece body is arranged on the lower surface, and the pole and the connecting piece body are opposite in position.

[0013] In a preferred embodiment, the pole is a positive pole and the current collecting piece is welded on a positive full tab of an electric core, or the pole is a negative pole and the current collecting piece is welded on a negative full tab of an electric core.

[0014] In a second aspect, the utility model also provides a full tab battery, including a shell of one end opening and the full tab battery's cover plate subassembly of any one of the above, and the electric core is contained in the shell, and the full tab battery's cover plate subassembly is arranged in one end of the shell opening.

[0015] Compared with the prior art, the full tab battery's cover plate subassembly and the full tab battery provided by the utility model, the connecting piece includes a connecting piece body and a welding part, the protective sleeve and the connecting piece body are fixed on the cover plate and the protective sleeve is located between the cover plate and the connecting piece body, one end of the connecting piece body extends in a direction away from the cover plate to form the welding part, the current collecting piece is welded on a full tab of an electric core, and the welding part is connected with the current collecting piece after being bent, the full tab is connected with the cover plate through the current collecting piece, the welding part of the connecting piece and the connecting piece body, the overcurrent cross-sectional area can be greatly increased, the internal resistance of the battery is greatly reduced, the safety performance is improved, the protective sleeve can prevent the connecting piece from being short-circuited by touching the cover plate or the shell, and the safety performance is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 It is a structural schematic view of the full tab battery's cover plate subassembly provided by the utility model.

[0018] Figure 2 The structure diagram of the connecting sheet in the cover plate assembly of the full-tab battery provided by the utility model is shown in the figure.

[0019] Figure 3 The structure diagram of the connecting sheet in the cover plate assembly of the full-tab battery provided by the utility model is shown in the figure.

[0020] Figure 4 The structure diagram of the connecting sheet in the cover plate assembly of the full-tab battery provided by the utility model is shown in the figure.

[0021] Figure 5 The structure diagram of the connecting sheet in the cover plate assembly of the full-tab battery provided by the utility model is shown in the figure.

CONCRETE IMPLEMENTING METHOD

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0023] Please refer to Figure 1 , which is the structure diagram of the cover plate assembly 100 of the full-tab battery provided by the utility model. The cover plate assembly 100 of the full-tab battery provided by the utility model can be applied in the full-tab battery. The positive and negative tab foils of the full-tab battery are used as tabs, and then connected with the cover plate body through the current collecting sheet and the connecting sheet in a large area, so that the flow cross-sectional area is greatly increased, the internal resistance of the battery is greatly reduced, the heating is reduced, and the safety performance is improved.

[0024] Please refer to Figures 2 to 4 , the cover plate assembly 100 of the full-tab battery includes a cover plate 10, a protective sleeve 20, a connecting sheet 30 and a current collecting sheet 40. The connecting sheet 30 includes a connecting sheet body 31 and a welding part 32, the protective sleeve 20 and the connecting sheet body 31 are fixed on the cover plate 10, and the protective sleeve 20 is located between the cover plate 10 and the connecting sheet body 31, one end of the connecting sheet body 31 extends away from the cover plate 10 to form the welding part 32, the current collecting sheet 40 is welded on the full-tab 41 of the battery cell, and the welding part 32 is bent and welded with the current collecting sheet 40.

[0025] It can be understood that the welding part 32 is bent and welded with the current collector 40, that is, the full tab 41 is connected with the current collector 40, the welding part 32 of the connecting piece, the connecting piece body 31 and the cover plate 10 in a large area, which can greatly increase the flow area and greatly reduce the internal resistance of the battery, reduce heat generation and improve safety performance. The protective sleeve 20 can prevent the connecting piece 30 from being short-circuited by touching the cover plate 10 or the shell, further improving the safety performance.

[0026] The cover plate assembly 100 can be used for a square aluminum shell battery. The cover plate 10 is rectangular, the shell is a rectangular box with one end open, and a plurality of battery cells are connected in series or parallel and accommodated in the shell. The total positive electrode or total negative electrode of the battery is led out by connecting the battery cell tabs with the cover plate. In this embodiment, the total positive electrode and the total negative electrode of the battery are led out at both ends of the cover plate 10, that is, the positive full tab of the battery cell is connected with the cover plate 10 through the current collector 40, the welding part 32 of the connecting piece, the connecting piece body 31, and then the total positive electrode of the battery is led out. The negative full tab of the battery cell is connected with the cover plate 10 through the current collector 40, the welding part 32 of the connecting piece, the connecting piece body 31, and then the total negative electrode of the battery is led out. The protective sleeve 20 corresponding to the total positive electrode of the battery, the connecting piece 30 and the current collector 40 are symmetrically arranged with the protective sleeve 20 corresponding to the total negative electrode of the battery, the connecting piece 30 and the current collector 40.

[0027] The cover plate assembly 100 further comprises a pole 11 and a rivet 12, the rivet 12 fixes the pole 11 and the connecting piece body 31 on the cover plate 10, and the pole 11 can be a positive pole or a negative pole. Specifically, the cover plate 10 comprises an upper surface 101 and a lower surface 102 opposite to the upper surface 101, the pole 11 is arranged on the upper surface 101, the connecting piece body 31 is arranged on the lower surface 102, and the pole 11 and the connecting piece body 31 are opposite to each other. Specifically, the pole is a positive pole and the current collector is welded on the positive full tab of the battery cell, or the pole is a negative pole and the current collector is welded on the negative full tab of the battery cell, that is, the positive full tab of the battery cell is connected with the cover plate 10 through the current collector 40, the welding part 32 of the connecting piece, the connecting piece body 31, and then the total positive electrode of the battery is led out by connecting the positive pole. The negative full tab of the battery cell is connected with the cover plate 10 through the current collector 40, the welding part 32 of the connecting piece, the connecting piece body 31, and then the total negative electrode of the battery is led out by connecting the negative pole.

[0028] Specifically, the battery cell is formed by winding the positive plate, the separator and the negative plate. The positive plate is divided into a positive coating area and a positive reserved area. The positive coating area is coated with positive slurry, and the positive reserved area is not coated with slurry. The negative plate is divided into a negative coating area and a negative reserved area. The negative coating area is coated with negative slurry, and the negative reserved area is not coated with slurry. The positive plate, the separator and the negative plate are stacked and wound to form the battery cell. The positive coating area is opposite to the negative coating area, and the positive reserved area and the negative reserved area are located at two ends of the battery cell. The positive reserved area and the negative reserved area are flattened to form positive full tabs and negative full tabs. The positive full tabs are connected to the cover plate 10 through the current collector 40 and the connecting piece 20. The negative full tabs are also connected to the cover plate 10 through the current collector 40 and the connecting piece 20. The welding area can be increased, and problems such as virtual welding of the tabs or welding of the tabs can be avoided due to the stacking of multiple tabs and insufficient welding strength. In addition, the current path can be greatly increased, the battery power can be greatly improved, and the battery rate performance and cycle life can be further improved.

[0029] The protective sleeve 20 is made of insulating material. The protective sleeve 20 includes a plate body 21 and two edges 22 extending from the plate 21 to both sides. The two edges 22 are perpendicular to the plate body 21. The plate body 21 is located between the cover plate 10 and the connecting piece body 31. The two edges 22 are located on both sides of the connecting piece body 31. The plate body 21 can prevent the connecting piece 30 from accidentally touching the cover plate 10. The edges 22 can prevent the connecting piece 30 from accidentally touching the shell, avoiding short circuit and improving the safety performance of the battery.

[0030] The connecting piece 30 is a conductor. The connecting piece body 30 is rectangular. Each connecting piece 30 includes two welding parts 32 located on one side of the connecting piece body 31. The two welding parts 32 are bent and welded. The welding area can be increased. The two bent parts 32 are not easy to break and are easy to weld, with high welding stability.

[0031] The number of current collectors 40 is two, i.e. two current collectors 40 are arranged on the full tab 41. The two current collectors 40 are opposite to each other and the edges of the current collectors 40 wrap the full tab 41. Two current collectors are welded on each full tab, i.e. the tab surfaces of the two opposite regions of the positive full tab are wrapped and welded on the current collector, and the tab surfaces of the two opposite regions of the negative full tab are wrapped and welded on the current collector. The multiple tabs can be fixed and efficiently utilized, which is convenient for welding. The current collector and the wrapped tab can form a super-large current-carrying area current collector, improving the overcurrent capacity. Specifically, the two welding parts 32 are bent towards the connecting piece body 31, and the two welding parts 32 are respectively welded with the two current collectors 40, increasing the welding area and improving the welding stability.

[0032] Specifically, the welding portion 32 is provided with a plurality of spaced first welding areas 321, and the current collector tab 40 is provided with a plurality of spaced second welding areas 401, and the first welding area 321 and the second welding area 401 are connected by laser welding, and since the welding portion 32 and the current collector tab 40 have a large area, a plurality of welding areas can be provided for welding, and the connecting tab 30, the current collector tab 40 and the full tab 41 form a current collector with a super large current carrying area, thereby increasing the welding area, increasing the current carrying area, reducing the internal resistance, improving the overcurrent capacity, and increasing the safety.

[0033] Please refer to Figure 5 The cover plate assembly 100 of the full tab battery also comprises an insulating bushing 50, the insulating bushing 50 comprises a fixed plate 51 and an abutting plate 52 connected to one end of the fixed plate 51, the fixed plate 51 is fixed to one side of the connecting tab body 31 away from the cover plate 10, and the abutting plate 52 abuts against the welding portion 32.

[0034] Further, one side of the fixed plate 51 away from the connecting tab body 31 is provided with a protruding fixing frame 511, specifically, the fixing frame 511 comprises a rectangular protrusion and a strip-shaped protrusion perpendicular to each other, the rectangular protrusion and the strip-shaped protrusion intersect at the middle position, the rectangular protrusion is long and wide relative to the strip-shaped protrusion, and the strip-shaped protrusion is short and narrow relative to the rectangular protrusion, the fixing frame 511 plays a role in fixing the battery cell, preventing the laser welding area of the cover plate and the tab from loosening or even coming off when the battery cell shakes, and avoiding the risk of increasing the internal resistance of the battery cell and reducing the safety factor.

[0035] Specifically, the insulating bushing 50 can protect the connecting tab 30 and the current collector tab 40, reduce the risk of short circuit of the battery cell, and use PET thermal insulation material to reduce the heat diffusion of the battery cell at low temperature, make the heat distribution of the battery cell uniform, and improve the electrical performance of the battery cell in a low temperature environment.

[0036] The utility model provides a kind of full tab square aluminum shell battery's welding cover plate, solve the problem that multiple tab square aluminum shell battery welding cover plate cannot be welded with full tab roll core, solve the problem that multiple tab welding cover plate is insufficient in high rate discharge, high energy density electric core is hot, high rate discharge capacity is low or cannot discharge electric quantity even current is too large and causes short circuit problem, solve the problem of discharge performance decline in low temperature environment, reduce the similar multiple tab battery and cover plate welding tab easy to break, and with connecting piece false welding, high rate discharge current collector internal resistance increases, battery heating problem, and low temperature environment under charge-discharge heat loss is too fast, and the problem of electric performance decline.The full tab battery welding cover plate provided by the utility model improves overcurrent capacity, increases current-carrying area to adapt to high rate charge-discharge reaction, adopts PET insulation heat preservation bushing, cooperates with the effect that full tab roll core radiates evenly, heat insulation capacity is strengthened, low temperature charge-discharge performance is improved, simultaneously avoid selecting multiple tab winding mode, cause tab deformation, tab height inconsistency, tab misplacement problem of electric core in die cutting, improve the safety performance of electric core.

[0037] The full tab welding cover plate designed in the application has the advantages of output power improvement, current-carrying area greatly increased, current conduction distance shortened, battery internal resistance and heat generation greatly reduced, safety performance improved, good heat dispersion, low temperature electric performance improved, and higher rate charge-discharge can be carried out.Although the number of tabs and overcurrent area of multiple tab battery are improved, compared with full tab battery, there are still great deficiencies, the positive and negative pole foils of full tab battery are used as tabs, and then connected with the battery cover plate / casing through the current collector and connecting piece, so that the overcurrent cross-sectional area is greatly increased, and the internal resistance of the battery is greatly reduced.

[0038] The utility model discloses a kind of full tab battery welding cover plates, which can be welded with full tab roll core, the pole and connecting piece are fixed by rivet, then connected with current collector layer (current collector and full tab being covered), to form a current collector with super large current-carrying area.The connecting piece on both sides of the cover plate can separate the positive and negative tabs and place them on both sides of the electric core, and the current collector at the tab is similar to the current collector disc of cylindrical electric core, with smaller volume, which can not only fix the tab, but also make the tabs tightly fit each other for easy welding;Meanwhile, the PET low-temperature insulation heat preservation bushing is used at both ends of the current collector, which separates the current collector from the casing while fixing it, greatly increases its safety, and plays a certain heat preservation role on the battery during discharge in low temperature environment, improves its low temperature discharge performance.In addition, it has low cost, easy to weld, full tab square electric core design, increased connection area between tab and cover plate, increased electron transmission channel during charge-discharge process, reduced internal resistance, improved high rate discharge capacity in low temperature environment, and increased safety due to the insulation of the current collector and the fixation of the roll core by the bushing.

[0039] The utility model also provides a full tab cell, including one end opening's casing and the full tab cell's cover plate subassembly 100 of any one embodiment described above, and the full tab cell's cover plate subassembly 100 sets up in casing opening one end. It is needful to explain, the full tab cell's cover plate subassembly of the utility model provides all embodiments are applicable to the full tab cell of the utility model provides, and can reach same or similar technical effect, this place does not repeat again.

[0040] Summarizing, the full tab cell's cover plate subassembly 100 and full tab cell provided by the utility model, the connecting piece 30 includes connecting piece body 31 and welding portion 32, the protection sleeve 20 and the connecting piece body 31 are fixed on the cover plate 10 and the protection sleeve 20 is located between the cover plate 10 and the connecting piece body 31, one end of the connecting piece body 31 extends to the direction away from the cover plate 10 and forms the welding portion 32, the current collector tab 40 is welded on the full tab 41 of the electric core, the welding portion 32 is welded and connected with the current collector tab 40 after bending, the full tab 41 is connected with the cover plate 10 through the current collector tab 40, the welding portion 32 of connecting piece and the connecting piece body 31, can make the overcurrent section area greatly increase, greatly reduces the internal resistance of battery, reduces the heating and improves the safety performance, the protection sleeve 20 can prevent the short circuit of connecting piece 30 accidental touch cover plate 10 or casing, further improves the safety performance.

[0041] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion using the utility model specification and attached drawing contents, or direct or indirect application in other related technical fields, are all included in the patent protection range of the utility model.

Claims

1. A cover plate assembly for a full tab battery, the cover plate assembly comprising: The connecting sheet comprises a connecting sheet body and a welding part, the protective sleeve and the connecting sheet body are fixed on the cover plate and the protective sleeve is located between the cover plate and the connecting sheet body, one end of the connecting sheet body extends away from the cover plate to form the welding part, the current collecting sheet is welded on the full tab of the battery cell, and the welding part is bent and welded with the current collecting sheet.

2. The full-ledge cell cover plate assembly of claim 1, wherein, Two current collecting sheets are arranged on the full tab, the two current collecting sheets are opposite to each other, and the edges of the current collecting sheets wrap the full tab.

3. The full-ledge cell cover plate assembly of claim 2, wherein, The welding part is two, the two welding parts are bent towards the connecting sheet body, and the two welding parts are respectively welded with the two current collecting sheets.

4. The full-ledge cell cover plate assembly of claim 1, wherein, The protective sleeve comprises a plate body and two edges formed by extending the plate to both sides, the two edges are perpendicular to the plate body, the plate body is located between the cover plate and the connecting sheet body, and the two edges are located on both sides of the connecting sheet body.

5. The full-ledge battery cover plate assembly of claim 1, wherein, Further comprising an insulating bushing, the insulating bushing comprises a fixed plate and an abutting plate connected to one end of the fixed plate, the fixed plate is fixed on the side of the connecting sheet body away from the cover plate, and the abutting plate abuts against the welding part.

6. The full-ledge cell cover plate assembly of claim 5, wherein, The side of the fixed plate away from the connecting sheet body is provided with a protruding fixing frame.

7. The full-ledge cell cover plate assembly of claim 1, wherein, Further comprising a pole and a rivet, the rivet fixes the pole and the connecting sheet body on the cover plate.

8. The full-ledge battery cover plate assembly of claim 7, wherein, The cover plate comprises an upper surface and a lower surface opposite to the upper surface, the pole is arranged on the upper surface, the connecting sheet body is arranged on the lower surface, and the pole and the connecting sheet body are opposite to each other.

9. The full-ledge battery cover plate assembly of claim 7, wherein, The pole is a positive pole and the current collecting sheet is welded on the positive full tab of the battery cell, or the pole is a negative pole and the current collecting sheet is welded on the negative full tab of the battery cell.

10. A full tab cell, characterized by, The full tab battery cover plate assembly comprises an open-ended shell and the full tab battery cover plate assembly as claimed in any one of claims 1-9, the battery cell is accommodated in the shell, and the full tab battery cover plate assembly is arranged at one end of the open end of the shell.

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