A battery with dense tabs

Abstract

The present invention discloses a battery with dense pole tabs, including a battery cell, the battery cell including a positive pole tab and a negative pole tab, a plurality of positive pole tabs are arranged on one end face of the battery cell, the positive pole tab is bent from the center of the battery cell to the peripheral direction, and a plurality of negative pole tabs are arranged on the other end face of the battery cell, the negative pole tab is bent from the center of the battery cell to the peripheral direction. The battery cell of the present invention is a dense pole tab structure, the positive pole tab and the negative pole tab of the present invention are bent from the center of the battery cell to the peripheral direction, that is, by adjusting the size of each positive pole tab, the size of each negative pole tab, the spacing between each positive pole tab, the spacing between each negative pole tab and the battery cell diameter and other parameters, it is possible to avoid overlapping between each positive pole tab or between each negative pole tab, so that the welding surface of the positive pole tab and the welding surface of the negative pole tab are flat, avoiding the phenomenon of cold welding and leaking welding caused by uneven welding surface, and improving the yield rate of the product.

Description

Technical Field

[0001] The invention relates to the field of batteries, and in particular to a battery with densely packed tabs. Background Art

[0002] Cylindrical charge-discharge battery cells with a diameter of less than 26 mm and a height of about 50 to 80 mm, on the one hand, due to the limitation of their structural dimensions, face difficulties in further increasing the energy storage capacity, further shortening the fast charging time, and making the explosion-proof function required for fast charging and discharging more reliable. On the other hand, the use of battery modules requires further increase in storage capacity. Without changing the battery size, improving the battery structure, and increasing the storage capacity of a single battery, only increasing the number of battery cells will inevitably lead to increasingly complex battery module structures and battery charge-discharge management systems, increasingly poor reliability of battery modules, and increasingly high manufacturing costs.

[0003] In order to increase the capacity of the battery, large-capacity fast-charge batteries often have multiple positive and negative ears, thereby increasing the electron transmission channel, reducing the current density, reducing polarization, and reducing the internal resistance of the battery. However, the multiple positive ears and the multiple negative ears are folded from the outside to the inside, and the multiple positive ears are easy to overlap with each other, resulting in overlapping points between the multiple positive ears, and the multiple negative ears are easy to overlap with each other, resulting in overlapping points between the multiple negative ears, resulting in an uneven welding surface. In this way, the welding between the positive ear and other components, and between the negative ear and other components is prone to cold welding or welding failure, which affects the yield rate of the battery.

[0004] In addition, conventional batteries generally do not have a separate filling port, but directly fill the battery liquid when assembling the battery cell, and finally seal the battery after the battery cell assembly and battery liquid filling are completed. In this way, the battery can only be filled once, and the battery liquid cannot be filled again after the battery assembly is completed, which has certain limitations. Summary of the invention

[0005] In order to overcome at least one defect of the above-mentioned prior art, the present invention provides a battery with dense pole tabs. The battery cell of the present invention is a dense pole tab structure. The positive pole tab and the negative pole tab of the present invention are bent from the center of the battery cell to the peripheral direction to avoid overlapping between each positive pole tab or each negative pole tab, so that the welding surface of the positive pole tab and the welding surface of the negative pole tab are flat, avoiding the phenomenon of cold welding and leaking welding caused by uneven welding surface, and improving the product yield. In this way, the present invention can realize dense arrangement of pole tabs, thereby shortening the current passing path inside the battery and reducing the internal resistance of the battery.

[0006] The technical solution adopted by the present invention to solve the problem is:

[0007] A battery with dense pole tabs includes a battery cell, the battery cell includes a positive pole tab and a negative pole tab, multiple positive pole tabs are arranged on one end surface of the battery cell, and the positive pole tabs are bent from the center of the battery cell to the peripheral direction, and multiple negative pole tabs are arranged on the other end surface of the battery cell, and the negative pole tabs are bent from the center of the battery cell to the peripheral direction.

[0008] In a preferred embodiment, the battery cell includes a battery cell winding body, which is formed by winding an anode sheet, a separator and a cathode sheet. The edge of the anode sheet is divided along the winding direction to form a plurality of positive electrode ears, and the plurality of positive electrode ears are radially arranged on one end face of the battery cell winding body. The edge of the cathode sheet is divided along the winding direction to form a plurality of negative electrode ears, and the plurality of negative electrode ears are radially arranged on the other end face of the battery cell winding body.

[0009] In a preferred embodiment, the battery with dense tabs includes a shell, the battery cell is installed in the inner cavity of the shell, the shell is provided with a positive electrode column, the positive electrode column is provided with a liquid filling port, the liquid filling port is connected to the inner cavity of the shell, and a one-way valve is provided at the liquid filling port.

[0010] In a preferred embodiment, the one-way valve includes a valve core and an elastic reset lug, a plurality of elastic reset lugs are radially supported on the circumference of the valve core, and a connection hole matching the elastic reset lug is provided on the circumference of the valve core;

[0011] When filling liquid, the liquid drives the valve core to overcome the elastic force of the elastic reset ear and move toward the inner cavity of the shell to form a filling gap;

[0012] After the filling is stopped, the elastic reset lug is reset to drive the valve core to move away from the inner cavity of the shell to close the filling gap.

[0013] In a preferred embodiment, a mounting hole for mounting the positive electrode column is provided on the housing, and the mounting hole is communicated with the inner cavity of the housing;

[0014] The positive electrode column includes a hollow cylinder, an external power connection terminal and an internal power connection terminal. The hollow cylinder is penetrated by the mounting hole, and the inner cavity of the hollow cylinder forms a liquid filling port. The external power connection terminal is connected to one end of the hollow cylinder, and the external power connection terminal extends out of the shell, and the internal power connection terminal is connected to the other end of the hollow cylinder, and the internal power connection terminal extends into the inner cavity of the shell.

[0015] In a preferred embodiment, the battery with dense tabs includes a sealed insulating structure, which is arranged between the positive electrode column and the shell to form an insulating layer;

[0016] The sealed insulating structure includes a protective ring, a sealing ring and an insulating sheet. The protective ring is arranged between the shell and the external power terminal and / or the hollow cylinder, the sealing ring is arranged between the shell and the internal power terminal and / or the hollow cylinder, and the insulating sheet is arranged between the shell and the sealing ring.

[0017] In a preferred embodiment, the battery with dense tabs includes a positive electrode collector and a negative electrode collector, the positive electrode collector and the negative electrode collector are arranged at both ends of the battery core, and the positive electrode collector and the negative electrode collector are both installed in the inner cavity of the shell;

[0018] The positive electrode collector sheet includes a positive electrode collector sheet body and at least one positive electrode flexible ear plate, one end of the positive electrode flexible ear plate is connected and fixed to the positive electrode collector sheet body to form a connecting end, the other end of the positive electrode flexible ear plate is a free end, and the free end of the positive electrode flexible ear plate is connected and fixed to the positive electrode ear;

[0019] A plurality of elastic reset hooks are arranged at the center of the positive electrode collector body;

[0020] The negative electrode collector sheet includes a negative electrode collector sheet body and at least one negative electrode flexible ear plate, one end of the negative electrode flexible ear plate is connected and fixed to the negative electrode collector sheet body to form a connecting end, and the other end of the negative electrode flexible ear plate is a free end, and the free end of the negative electrode flexible ear plate is connected and fixed to the negative electrode ear.

[0021] In a preferred embodiment, a plurality of positive electrode flexible ear plates are radially arranged around the center of the positive electrode collector sheet body, the connection end of the positive electrode flexible ear plate is arranged close to the center of the positive electrode collector sheet body, and the free end of the positive electrode flexible ear plate is arranged away from the center of the positive electrode collector sheet body;

[0022] A plurality of negative flexible ear plates are radially arranged around the center of the negative current collector body, the connection end of the negative flexible ear plate is arranged close to the center of the negative current collector body, and the free end of the negative flexible ear plate is arranged away from the center of the negative current collector body.

[0023] In a preferred embodiment, the battery with dense tabs includes a positive terminal cover and a negative terminal cover, the positive terminal cover and the negative terminal cover are respectively arranged at the two ends of the inner cavity of the shell, and the positive terminal cover and the negative terminal cover are both connected to the shell, the positive terminal cover is connected to the positive electrode collector body to form a positive electrode collector, the negative terminal cover is connected to the negative electrode collector body to form a negative electrode collector, the battery cell is arranged between the positive electrode collector and the negative electrode collector, and the shell, the positive electrode collector and the negative electrode collector perform axial positioning and radial positioning on the battery cell;

[0024] A first avoidance hole is arranged on the positive terminal cover, and the first avoidance hole provides floating space for the positive flexible ear plate. A second avoidance hole is arranged on the negative terminal cover, and the second avoidance hole provides floating space for the negative flexible ear plate.

[0025] In a preferred embodiment, the battery with dense pole ears includes a bottom cover, which is arranged close to the negative terminal cover and connected to the shell, a positioning column is arranged on the bottom cover, a first through hole is arranged on the negative terminal cover, and a second through hole is arranged on the negative electrode collector, and the positioning column extends into the core of the battery cell through the first through hole and the second through hole.

[0026] In a preferred embodiment, the battery cell winding body is covered with an insulating sheath, the innermost layer of the battery cell winding body is the cathode sheet, the positioning post abuts against the cathode sheet located at the innermost layer of the battery cell winding body, and the insulating sheath and the positioning post radially position the battery cell winding body.

[0027] In a preferred embodiment, at least one heat dissipation recess is provided on the bottom cover;

[0028] At least one positioning protrusion is provided on the bottom cover, and a third through hole matching with the positioning protrusion is provided on the negative end cover, and the positioning protrusion realizes the connection between the bottom cover and the negative end cover through the third through hole;

[0029] An explosion-proof groove is arranged on the bottom cover, and the area surrounded by the explosion-proof groove is an explosion-proof cover.

[0030] In summary, the present invention has the following technical effects:

[0031] 1. The battery cell of the present invention is a densely packed lug structure. The positive and negative lugs of the present invention are bent from the center of the battery cell to the peripheral direction, that is, by adjusting the size of each positive lug, the size of each negative lug, the spacing between each positive lug, the spacing between each negative lug, and the diameter of the battery cell, etc., it is possible to avoid overlapping between each positive lug or each negative lug, so that the welding surface of the positive lug and the welding surface of the negative lug are flat, avoiding the phenomenon of cold welding and leaking welding caused by uneven welding surface, and improving the yield rate of the product. In this way, the present invention can realize densely arranged lugs, thereby shortening the internal current passage path of the battery and reducing the internal resistance of the battery.

[0032] 2. The present invention provides a liquid filling port at the position of the positive electrode column, and a one-way valve is provided at the liquid filling port. The one-way valve includes a valve core and an elastic reset ear, and the elastic reset ear is provided on the positive electrode collector. The above arrangement not only optimizes the structure of the battery, but also facilitates the filling and replenishment of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0035] Figure 3 It is a schematic diagram of the internal partial structure of the present invention.

[0036] Figure 4 It is a schematic diagram of the decomposition structure of the present invention.

[0037] Figure 5 It is a schematic diagram of the partial structure of the battery cell of the present invention.

[0038] Figure 6 It is a schematic diagram of the structure of the battery core winding body of the present invention.

[0039] Figure 7 It is a schematic diagram of the structure of the positive electrode ear of the present invention.

[0040] Figure 8 It is a schematic structural diagram of the positive electrode current collector of the present invention.

[0041] Fig. 9 It is a structural schematic diagram of the one-way valve of the present invention.

[0042] Fig.10 It is a schematic structural diagram of the bottom cover and the negative electrode current collector of the present invention.

[0043] The meanings of the reference numerals are as follows:

[0044] 10. Battery cell, 11. Positive electrode ear, 12. Negative electrode ear, 13. Battery cell winding body, 131. Anode sheet, 132. Diaphragm, 133. Cathode sheet, 14. Insulating sheath, 20. Shell, 30. Positive electrode column, 31. Hollow cylinder, 32. External power connection terminal, 33. Internal power connection terminal, 40. Filling port, 50. One-way valve, 51. Valve core, 52. Elastic reset ear, 53. Connection hole, 54. Sealing ring, 60. Mounting hole, 70. Power connection ring, 80. Sealing insulation structure, 81. Protective ring, 82. Sealing ring, 83. Insulating sheet, 90. Positive current collector sheet, 91. Positive current collector sheet body , 92, positive electrode flexible ear plate, 100, negative electrode collector sheet, 101, negative electrode collector sheet body, 102, negative electrode flexible ear plate, 110, positive terminal cover, 120, negative terminal cover, 130, first avoidance hole, 140, second avoidance hole, 150, buckle assembly, 151, buckle, 152, positioning hole, 160, first circle edge, 170, second circle edge, 180, bottom cover, 190, positioning column, 200, first through hole, 210, second through hole, 220, heat dissipation recess, 230, positioning convex portion, 240, third through hole, 250, fourth through hole, 260, explosion-proof cover, 270, third circle edge. DETAILED DESCRIPTION

[0045] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0048] See also Figure 1-Figure 10 The present invention discloses a battery with dense pole tabs, including a battery cell 10, the battery cell 10 including a positive pole tab 11 and a negative pole tab 12, a plurality of positive pole tabs 11 are arranged on one end surface of the battery cell 10, and the positive pole tab 11 is bent from the center of the battery cell 10 to the peripheral direction, and a plurality of negative pole tabs 12 are arranged on the other end surface of the battery cell 10, and the negative pole tab 12 is bent from the center of the battery cell 10 to the peripheral direction.

[0049] Therefore, the battery cell 10 of the present invention is a dense-type pole ear structure, which is different from the way in which the pole ears are bent from the outside to the inside in the prior art, that is, the positive pole ear 11 and the negative pole ear 12 of the present invention are bent from the inside to the outside, specifically, the positive pole ear 11 and the negative pole ear 12 are bent from the center of the battery cell 10 to the peripheral direction. That is, by adjusting the size of each positive pole ear 11, the size of each negative pole ear 12, the spacing between each positive pole ear 11, the spacing between each negative pole ear 12 and the battery cell diameter and other parameters, it is possible to avoid overlapping between each positive pole ear 11 or each negative pole ear 12, so that the welding surface of the positive pole ear 11 and the welding surface of the negative pole ear 12 are flat, avoiding the phenomenon of false welding and leaking welding caused by uneven welding surface, and improving the product yield. In this way, under the same power connection area as the prior art, the present invention can arrange a larger number of pole ears, thereby shortening the internal current passage path of the battery and reducing the internal resistance of the battery.

[0050] In the present invention, the battery cell 10 includes a battery cell winding body 13, which is formed by winding an anode sheet 131, a separator 132 and a cathode sheet 133. The edge of the anode sheet 131 is divided along the winding direction to form a plurality of positive electrode tabs 11, and the plurality of positive electrode tabs 11 are radially arranged on one end face of the battery cell winding body 13. The edge of the cathode sheet 133 is divided along the winding direction to form a plurality of negative electrode tabs 12, and the plurality of negative electrode tabs 12 are radially arranged on the other end face of the battery cell winding body 13.

[0051] Specifically, the anode sheet 131 is an anode diaphragm made of metal, the cathode sheet 133 is a cathode diaphragm made of metal, and a layer of anode diaphragm, a layer of diaphragm 132, a layer of cathode diaphragm and a layer of diaphragm 132 are stacked and wound in sequence to form a battery cell winding body 13.

[0052] In the present invention, the battery with dense tabs includes a shell 20, the battery cell 10 is installed in the inner cavity of the shell 20, a positive electrode column 30 is provided on the shell 20, a liquid filling port 40 is provided on the positive electrode column 30, the liquid filling port 40 is connected to the inner cavity of the shell 20, and a one-way valve 50 is provided at the liquid filling port 40.

[0053] In the present invention, the one-way valve 50 includes a valve core 51 and an elastic reset lug 52, wherein a plurality of elastic reset lugs 52 are radially supported on the circumference of the valve core 51, and a connecting hole 53 cooperating with the elastic reset lug 52 is provided on the circumference of the valve core 51; when filling liquid, the liquid drives the valve core 51 to overcome the elastic force of the elastic reset lug 52 and move toward the inner cavity of the shell 20 to form a filling gap, that is, the valve core 51 moves along the filling port 40 toward the inner cavity of the shell 20 to form a filling gap; after the filling liquid is stopped, the elastic reset lug 52 is reset to drive the valve core 51 to move toward the inner cavity away from the shell 20 to close the filling gap, that is, the valve core 51 moves along the filling port 40 toward the inner cavity of the original shell 20 to form a filling gap.

[0054] Specifically, the elastic reset hook 52 is wavy in shape as a whole and is made of a metal sheet to ensure its elastic force for reset.

[0055] Specifically, in order to ensure the sealing performance of the one-way valve 50 , at least one sealing ring 54 is sleeved on the valve core 51 . The sealing ring 54 is constrained by the sealing surface of the liquid filling port 40 and the valve core 51 to produce sufficient deformation to produce a sealing effect.

[0056] In the present invention, a mounting hole 60 for mounting the positive electrode column 30 is provided on the shell 20, and the mounting hole 60 is communicated with the inner cavity of the shell 20; the positive electrode column 30 includes a hollow cylinder 31, an external power connection terminal 32 and an internal power connection terminal 33, the hollow cylinder 31 is penetrated by the mounting hole 60, and the inner cavity of the hollow cylinder 31 forms a liquid filling port 40, the external power connection terminal 32 is connected to one end of the hollow cylinder 31, and the external power connection terminal 32 extends out of the shell 20, and the internal power connection terminal 33 is connected to the other end of the hollow cylinder 31, and the internal power connection terminal 33 extends into the inner cavity of the shell 20.

[0057] Furthermore, in order to facilitate conduction, a power connection ring 70 is provided in the inner cavity of the shell 20. The power connection ring 70 is arranged at the internal power connection terminal 33. The internal power connection terminal 33 has an internal power connection surface. During the assembly process, the power connection ring 70 is rolled and leveled to obtain a flat internal power connection surface as the basis, so that a larger current passing area can be obtained, thereby fitting with the positive electrode collector 90.

[0058] Preferably, the housing 20 , the mounting hole 60 , the hollow cylinder 31 , the filling port 40 , the one-way valve 50 and the battery cell 10 are concentrically arranged. The mounting hole 60 , the hollow cylinder 31 , the filling port 40 , the one-way valve 50 are all arranged at the central axis position of the housing 20 .

[0059] The positive electrode column 30 is made of a metal material with good conductivity and ductility, such as lithium cobalt oxide (LCO), lithium manganese oxide (LMO), lithium iron phosphate (LFP), ternary materials (lithium nickel cobalt manganese oxide (NCM) and lithium nickel cobalt aluminum oxide (NCA)), etc., which are selected according to the actual application scenario.

[0060] The external power connection terminal 32 has an external power connection surface, which is in the form of a circular ring. If necessary, it can be expanded in all directions to obtain a larger power-passing area, thereby reducing the current density. The internal power connection terminal 33 has an internal power connection surface, which fits with the positive electrode collector sheet 90 described below, so as to obtain a larger power-passing area and pass a larger current. In this way, the above structure meets the needs of the battery to pass a large current during fast charging and discharging, and is particularly suitable for large-capacity fast-charging batteries.

[0061] In the present invention, the battery with dense pole ears includes a sealed insulating structure 80, which is arranged between the positive electrode 30 and the shell 20 to form an insulating layer; the sealed insulating structure 80 includes a protective ring 81, a sealing ring 82 and an insulating sheet 83, the protective ring 81 is arranged between the shell 20 and the external power terminal 32 and / or the hollow cylinder 31, the sealing ring 82 is arranged between the shell 20 and the internal power terminal 33 and / or the hollow cylinder 31, and the insulating sheet 83 is arranged between the shell 20 and the sealing ring 82.

[0062] See also Figure 2-Figure 3 , the protective ring 81, the sealing ring 82 and the insulating sheet 83 are all made of non-metallic insulating materials, such as rubber; the protective ring 81, the sealing ring 82 and the insulating sheet 83 isolate the positive pole 30 from the shell 20. The protective ring 81 protects the positive pole 30 from mechanical impact damage. The protective ring 81 increases the creepage distance between the outer surface of the positive pole 30 and the outer surface of the shell 20, improves the insulation performance, and can prevent battery short circuit failures caused by the accumulation of larger particles of conductive dust during battery use. During assembly, the insulating sheet 83 is used as a gasket, and the calendering deformation generated by the preset material of the positive pole 30 will be densely pressed between the insulating sheet 83 and the shell 20, and a sealing effect will be produced after the compression deformation.

[0063] Specifically, the protective ring 81 is arranged between the shell 20 and the external power terminal 32 and the hollow cylinder 31, and between the shell 20 and the internal power terminal 33 and the hollow cylinder 31. The cross-section of the protective ring 81 is "L"-shaped, which further increases the creepage distance between the outer surface of the positive electrode column 30 and the outer surface of the shell 20. The cross-section of the sealing ring 82 is "L"-shaped, which improves the sealing performance here.

[0064] In the present invention, the battery with dense pole ears includes a positive electrode collector sheet 90 and a negative electrode collector sheet 100, the positive electrode collector sheet 90 and the negative electrode collector sheet 100 are arranged at both ends of the battery cell 10, and the positive electrode collector sheet 90 and the negative electrode collector sheet 100 are both installed in the inner cavity of the shell 20; the positive electrode collector sheet 90 includes a positive electrode collector sheet body 91 and at least one positive electrode flexible ear plate 92, one end of the positive electrode flexible ear plate 92 is connected and fixed to the positive electrode collector sheet body 91 to form a connection end, and the other end of the positive electrode flexible ear plate 92 is fixed to the positive electrode collector sheet body 91 to form a connection end. One end is a free end, and the free end of the positive flexible ear plate 92 is connected and fixed to the positive electrode ear 11; a plurality of elastic reset ears 52 are arranged at the central part of the positive electrode collector sheet body 91; the negative electrode collector sheet 100 includes a negative electrode collector sheet body 101 and at least one negative electrode flexible ear plate 102, one end of the negative electrode flexible ear plate 102 is connected and fixed to the negative electrode collector sheet body 101 to form a connecting end, and the other end of the negative electrode flexible ear plate 102 is a free end, and the free end of the negative electrode flexible ear plate 102 is connected and fixed to the negative electrode ear 12.

[0065] In this way, the elastic reset ear 52 is integrated into the positive electrode collector body 91, which can not only realize the function of the one-way valve 50, perform liquid filling and multiple liquid replenishment, but also ensure that the positive electrode collector body 91 is charged, utilize the axial core space of the battery, and simplify the overall structure of the battery.

[0066] Specifically, the positive electrode collector sheet 90 and the negative electrode collector sheet 100 are both annular. The positive electrode collector sheet 90 is annular to avoid blocking the one-way valve 50 and affecting its liquid inlet. The negative electrode collector sheet 100 is annular to facilitate the positioning column 190 to extend into the axis core of the battery cell 10 for positioning.

[0067] Specifically, a positive electrode flexible ear plate 92 is obtained by opening an arc groove on the positive electrode collector sheet body 91, and the positive electrode flexible ear plate 92 can move up and down with a small interval relative to the positive electrode collector sheet body 91, and the movable interval is 0.05mm~0.10mm. In this way, the positive electrode flexible ear plate 92 is flexible relative to the positive electrode collector sheet body 91; a negative electrode flexible ear plate 102 is obtained by opening an arc groove on the negative electrode collector sheet body 101, and the negative electrode flexible ear plate 102 can move up and down with a small interval relative to the negative electrode collector sheet body 101, and the movable interval is 0.05mm~0.10mm. In this way, the negative electrode flexible ear plate 102 is flexible relative to the negative electrode collector sheet 100.

[0068] Therefore, the positive flexible ear plate 92 and the positive pole tab 11, and the negative flexible ear plate 102 and the negative pole tab 12 can be assembled together by welding process to reduce contact resistance. During assembly, when the battery cell 10 is pushed in from the lower part of the shell 20, the outer surface of the battery cell 10 and the inner surface of the shell 20 rub against each other, which may cause the end faces of the positive pole tab 11 and the negative pole tab 12 of the battery cell 10 to present a slightly collapsed or convex curved surface. Since the positive flexible ear plate 92 is flexible and has floating space relative to the positive collector sheet body 91, and the negative flexible ear plate 102 is flexible and has floating space relative to the negative collector sheet body 101, the positive collector sheet 90 is prevented from exerting excessive pulling force on the positive pole tab 11, and the negative collector sheet 100 is prevented from exerting excessive pulling force on the negative pole tab 12, and the breakage of the positive pole tab 11 and the negative pole tab 12 is avoided, ensuring the positive pole tab 11 and the positive flexible ear plate 92 are in good contact with each other. , there is a reliable current passing capacity between the negative electrode tab 12 and the negative electrode flexible ear plate 102; similarly, when the temperature of the battery environment changes greatly, under conditions such as thermal expansion and contraction, welding, etc., because the positive electrode flexible ear plate 92 is flexible and has floating space relative to the positive electrode collector sheet body 91, and the negative electrode flexible ear plate 102 is flexible and has floating space relative to the negative electrode collector sheet body 101, the positive electrode collector sheet 90 is prevented from exerting excessive pulling force on the positive electrode tab 11, and the negative electrode collector sheet 100 is prevented from exerting excessive pulling force on the negative electrode tab 12, thereby avoiding the breakage of the positive electrode tab 11 and the negative electrode tab 12, thereby ensuring that there is a reliable current passing capacity between the positive electrode tab 11 and the positive flexible ear plate 92, and between the negative electrode tab 12 and the negative flexible ear plate 102.

[0069] In the present invention, a plurality of positive flexible ear plates 92 are radially arranged around the center of the positive collector sheet body 91, the connection end of the positive flexible ear plate 92 is arranged close to the center of the positive collector sheet body 91, the free end of the positive flexible ear plate 92 is arranged away from the center of the positive collector sheet body 91, and the free end of the positive flexible ear plate 92 is arranged close to the periphery of the positive collector sheet body 91; a plurality of negative flexible ear plates 102 are radially arranged around the center of the negative collector sheet body 101, the connection end of the negative flexible ear plate 102 is arranged close to the center of the negative collector sheet body 101, and the free end of the negative flexible ear plate 102 is arranged away from the center of the negative collector sheet body 101, that is, the free end of the negative flexible ear plate 102 is arranged close to the periphery of the negative collector sheet body 101.

[0070] In the present invention, multiple positive pole tabs 11 are arranged along the winding direction of the battery cell 10, that is, multiple positive pole tabs 11 are arranged along the circumference direction of the battery cell 10, and their arrangement density is based on not overlapping each other; multiple negative pole tabs 12 are arranged along the winding direction of the battery cell 10, that is, multiple negative pole tabs 12 are arranged along the circumference direction of the battery cell 10, and their arrangement density is based on not overlapping each other. The storage capacity of the battery with an explosion-proof filling port is related to the overlapping area of ​​the cathode sheet 133, the diaphragm 132, and the anode sheet 131. The outermost circle has the longest length, the largest area, and the largest storage capacity, and gradually decreases toward the central axis.

[0071] Specifically, overlapping of multiple positive electrode ears 11 can be avoided by adjusting the number of positive electrode ears 11, the size of each positive electrode ear 11 and the spacing between each positive electrode ear 11, so that the welding surface between the positive electrode ear 11 and the positive flexible ear plate 92 is smooth, and the phenomenon of cold welding and welding leakage caused by the uneven welding surface when the positive electrode ear 11 and the positive flexible ear plate 92 are welded can be avoided; similarly, overlapping of multiple negative electrode ears 12 can be avoided by adjusting the number of negative electrode ears 12, the size of each negative electrode ear 12 and the spacing between each negative electrode ear 12, so that the welding surface between the negative electrode ear 12 and the negative flexible ear plate 102 is smooth, and the phenomenon of cold welding and welding leakage caused by the uneven welding surface when the negative electrode ear 12 and the negative flexible ear plate 102 are welded can be avoided, thereby improving the yield rate of the product.

[0072] See also Figure 6-Figure 7 The number of positive electrode tabs 11 and negative electrode tabs 12 is calculated based on the unfolded length of the battery cell winding body 13 and the width of the positive electrode tabs 11 and negative electrode tabs 12. Generally, a portion of material is separated from the edges of the anode sheet 131 and the cathode sheet 133 to obtain positive electrode tabs 11 and negative electrode tabs 12 with the same width.

[0073] (1) The number of tabs is calculated according to the following formula.

[0074] N=L / W

[0075] Where:

[0076] N——the number of tabs;

[0077] L——the unfolded length of the battery cell winding body 13, measured in millimeters (mm);

[0078] W - the width of the pole ear, measured in millimeters (mm).

[0079] (2) Tab density on the cell winding body 13

[0080] The positive electrode tab 11 and the negative electrode tab 12 are distributed in the annular regions at both ends of the battery cell winding body 13, and the distribution density is calculated according to the following formula.

[0081]

[0082] Where:

[0083] M——distribution density of the tabs, unit of measurement: pieces / square centimeter (pieces / cm2);

[0084] π——pi, value is 3.14159;

[0085] D——diameter of the circumscribed circle of the battery core winding body 13, measured in millimeters (cm);

[0086] d——diameter of the inscribed circle at the center of the battery winding body 13, unit of measurement: centimeter (cm);

[0087] N——The number of tabs, unit of measurement: piece.

[0088] In this way, in order to arrange more positive flexible ear plates 92 on the positive current collector sheet body 91 of the same size, the size of the positive flexible ear plate 92 close to the center of the positive current collector sheet body 91 is smaller than the size of the positive flexible ear plate 92 away from the center of the positive current collector sheet body 91, and the overall shape is fan-shaped with a small inside and a large outside; similarly, in order to arrange more negative flexible ear plates 102 on the negative current collector sheet body 101 of the same size, the size of the negative flexible ear plate 102 close to the center of the positive current collector sheet body 91 is smaller than the size of the negative flexible ear plate 102 away from the center of the negative current collector sheet body 101, and the overall shape is fan-shaped with a small inside and a large outside.

[0089] Furthermore, since the positive flexible ear plate 92 is generally fan-shaped with a small inside and a large outside, it is adapted to the arrangement of multiple positive pole ears 11. The positive flexible ear plate 92 and the positive pole ears 11 are both radially distributed, with fewer positive pole ears 11 located in the inner circle and more positive pole ears 11 located in the outer circle. This is conducive to welding the positive flexible ear plate 92 and the positive pole ears 11 together, thereby improving the utilization rate of the positive electrode collector sheet 90. More positive pole ears 11 can be welded on a positive electrode collector sheet 90 of a certain size, achieving a larger range of flexible connection between the two, avoiding breakage of the positive pole ears 11 under assembly, thermal expansion and contraction, and ensuring the current carrying capacity.

[0090] Similarly, since the negative electrode flexible ear plate 102 is generally fan-shaped with a small inside and a large outside, it is adapted to the arrangement of multiple negative electrode tabs 12. The negative electrode flexible ear plate 102 and the negative electrode tabs 12 are both radially distributed, with fewer negative electrode tabs 12 located in the inner circle and more negative electrode tabs 12 located in the outer circle. This is conducive to welding the negative electrode flexible ear plate 102 and the negative electrode tabs 12 together, thereby improving the utilization rate of the negative electrode collector sheet 100. More negative electrode tabs 12 can be welded on a negative electrode collector sheet 100 of a certain size, achieving a larger range of flexible connection between the two, avoiding breakage of the negative electrode tabs 12 during assembly, thermal expansion and contraction, and ensuring the current carrying capacity.

[0091] In the present invention, the battery with dense pole ears includes a positive terminal cover 110 and a negative terminal cover 120, which are respectively arranged at the two ends of the inner cavity of the shell 20, and the positive terminal cover 110 and the negative terminal cover 120 are both connected to the shell 20, the positive terminal cover 110 is connected to the positive electrode collector body 91 to form a positive electrode collector, and the negative terminal cover 120 is connected to the negative electrode collector body 101 to form a negative electrode collector. The battery cell 10 is arranged between the positive electrode collector and the negative electrode collector, and the shell 20, the positive electrode collector and the negative electrode collector perform axial and radial positioning on the battery cell 10; a first avoidance hole 130 is arranged on the positive terminal cover 110, and the first avoidance hole 130 provides a floating space for the positive flexible ear plate 92, and a second avoidance hole 140 is arranged on the negative terminal cover 120, and the second avoidance hole 140 provides a floating space for the negative flexible ear plate 102.

[0092] It is understandable that the floating space of the positive flexible ear plate 92 and the floating space of the negative flexible ear plate 102 are both relatively small, generally 0.05mm to 0.10mm, and the floating direction is close to the axial direction, and the floating space is a fine-tuning space. In this way, the battery cell 10 will not move axially, and will not affect the axial positioning of the battery cell 10 by the housing 20, the positive current collector, and the negative current collector.

[0093] Specifically, see Figure 5 , Figure 8-Figure 9 The positive terminal cap 110 is connected to the positive collector sheet body 91 through a buckle assembly 150. The positive collector sheet body 91 is provided with a buckle 151. The positive terminal cap 110 is provided with a positioning hole 152 that cooperates with the buckle 151. The positioning and installation of the positive terminal cap 110 and the positive collector sheet body 91 are completed by the cooperation between the buckle 151 and the positioning hole 152. The negative terminal cap 120 is connected to the negative collector sheet body 101 through a buckle assembly 150. The negative collector sheet body 101 is provided with a buckle 151. The negative terminal cap 120 is provided with a positioning hole 152 that cooperates with the buckle 151. The positioning and installation of the negative terminal cap 120 and the negative collector sheet body 101 are completed by the cooperation between the buckle 151 and the positioning hole 152.

[0094] Specifically, the positive electrode collector sheet 90 and the negative electrode collector sheet 100 are both made of conductive metal sheets, such as gold, silver, copper or aluminum, etc. The positive terminal cover 110 and the negative terminal cover 120 are both made of non-conductive insulating materials, such as plastic or rubber, etc.

[0095] Specifically, the positive terminal cap 110 and the negative terminal cap 120 are both spoke-shaped, the outer periphery of the positive terminal cap 110 has a first edge 160, and the outer periphery of the negative terminal cap 120 has a second edge 170. During installation, the two ends of the battery cell 10 are respectively installed in the first edge 160 and the second edge 170, and the first edge 160 and the second edge 170 position the battery cell 10 in the radial direction.

[0096] In the present invention, the battery with dense pole ears includes a bottom cover 180, which is arranged close to the negative terminal cover 120 and is connected to the shell 20. A positioning column 190 is arranged on the bottom cover 180, a first through hole 200 is arranged on the negative terminal cover 120, and a second through hole 210 is arranged on the negative electrode collector 100. The positioning column 190 extends into the core of the battery cell 10 through the first through hole 200 and the second through hole 210.

[0097] In order to achieve the connection between the bottom cover 180 and the negative end cover 120, the inner diameter of the first through hole 200 matches the outer diameter of the positioning column 190; in order to avoid the positioning column 190 and the negative electrode collector 100 from being connected and conductive, the inner diameter of the second through hole 210 is larger than the outer diameter of the positioning column 190.

[0098] In the present invention, an insulating sheath 14 is provided on the outer shell of the battery cell winding body 13, and the innermost layer of the battery cell winding body 13 is the cathode sheet 133. The positioning column 190 abuts against the cathode sheet 133 located at the innermost layer of the battery cell winding body 13, and the insulating sheath 14 and the positioning column 190 radially position the inner and outer tops of the battery cell winding body 13.

[0099] In this way, the battery cell 10 of the present invention achieves axial positioning and radial positioning, thereby preventing axial movement and radial movement during use, thereby improving the safety of battery use.

[0100] In the present invention, at least one heat dissipation recess 220 is provided on the bottom cover 180; at least one positioning protrusion 230 is provided on the bottom cover 180, and a third through hole 240 cooperating with the positioning protrusion 230 is provided on the negative end cover 120, and the positioning protrusion 230 realizes the connection between the bottom cover 180 and the negative end cover 120 through the third through hole 240; the negative electrode collector sheet 100 is provided with a fourth through hole 250 for avoiding the positioning protrusion 230; an explosion-proof groove is provided on the bottom cover 180, and the area surrounded by the explosion-proof groove is the explosion-proof cover 260.

[0101] Specifically, a plurality of heat dissipation recesses 220 are arranged at intervals along the circumferential direction of the bottom cover 180 .

[0102] Specifically, the bottom cover 180 is spoke-shaped as a whole, and the outer contour of the bottom cover 180 has a third edge 270, and the bottom cover 180 is matched with the housing 20 through the third edge 270. After the bottom cover 180 is installed in place at the bottom of the housing 20, the bottom of the housing 20 and the third edge 270 are welded together using a welding process to seal the battery cell 10 in the inner cavity of the housing 20.

[0103] Specifically, the bottom cover 180 is made of a metal conductive sheet with good ductility, and a mold pressing process can be used to press out heat dissipation recesses 220 evenly distributed along the circumference on the bottom cover 180, thereby increasing the heat dissipation area of ​​the bottom cover 180. The uneven bottom cover 180 provides a ventilation and heat dissipation channel. During the forming process, compared with the raw material in the shape of a thin plate, the metal material extends at the deformed part to produce cold work hardening, thereby improving the strength in terms of structure and material deformation. Therefore, the bottom cover 180 can be made of lighter and less material, saving manufacturing costs.

[0104] In this way, the present invention improves the energy density of the battery, the battery has a strong load capacity, a fast charging speed, a large capacity of a single battery, reduces the number of battery modules, reduces the number of individual batteries in the battery assembly, simplifies the battery modules and battery assembly, simplifies the battery management system when using the battery, and reduces the line power consumption and manufacturing cost of the power management system.

[0105] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A battery with dense tabs, characterized in that: A battery cell includes a positive electrode tab and a negative electrode tab, wherein a plurality of the positive electrode tabs are arranged on one end surface of the battery cell, and the positive electrode tabs are bent from the center of the battery cell to the peripheral direction, and a plurality of the negative electrode tabs are arranged on the other end surface of the battery cell, and the negative electrode tabs are bent from the center of the battery cell to the peripheral direction; It also includes a shell, the battery core is installed in the inner cavity of the shell, the shell is provided with a positive pole, the positive pole is provided with a liquid filling port, the liquid filling port is connected with the inner cavity of the shell, and a one-way valve is provided at the liquid filling port; The one-way valve comprises a valve core and an elastic reset lug, wherein a plurality of the elastic reset lugs are radially supported on the circumference of the valve core, and the circumference of the valve core is provided with a connection hole matched with the elastic reset lug; When filling with liquid, the liquid drives the valve core to overcome the elastic force of the elastic reset ear and move toward the inner cavity of the shell to form a filling gap; After the filling is stopped, the elastic reset lug is reset to drive the valve core to move away from the inner cavity of the shell to close the filling gap; It comprises a positive electrode collector sheet and a negative electrode collector sheet, the positive electrode collector sheet and the negative electrode collector sheet are arranged at two ends of the battery core, and the positive electrode collector sheet and the negative electrode collector sheet are both installed in the inner cavity of the shell; The positive electrode current collector sheet comprises a positive electrode current collector sheet body and at least one positive electrode flexible ear plate, one end of the positive electrode flexible ear plate is connected and fixed to the positive electrode current collector sheet body to form a connection end, the other end of the positive electrode flexible ear plate is a free end, and the free end of the positive electrode flexible ear plate is connected and fixed to the positive electrode tab; A plurality of elastic reset hooks are provided at the central part of the positive electrode collector body; The negative electrode collector sheet includes a negative electrode collector sheet body and at least one negative electrode flexible ear plate, one end of the negative electrode flexible ear plate is connected and fixed to the negative electrode collector sheet body to form a connecting end, and the other end of the negative electrode flexible ear plate is a free end, and the free end of the negative electrode flexible ear plate is connected and fixed to the negative electrode ear.

2. The battery with dense tabs according to claim 1, characterized in that: The battery cell includes a battery cell winding body, which is formed by winding an anode sheet, a separator and a cathode sheet. The edge of the anode sheet is divided along the winding direction to form a plurality of positive electrode tabs, and the plurality of positive electrode tabs are radially arranged on one end face of the battery cell winding body. The edge of the cathode sheet is divided along the winding direction to form a plurality of negative electrode tabs, and the plurality of negative electrode tabs are radially arranged on the other end face of the battery cell winding body.

3. The battery with dense tabs according to claim 1, characterized in that: The shell is provided with a mounting hole for mounting the positive electrode column, and the mounting hole is communicated with the inner cavity of the shell; The positive electrode column includes a hollow cylinder, an external power connection terminal and an internal power connection terminal. The hollow cylinder is inserted into the mounting hole, and the inner cavity of the hollow cylinder forms the liquid filling port. The external power connection terminal is connected to one end of the hollow cylinder, and the external power connection terminal extends out of the shell, and the internal power connection terminal is connected to the other end of the hollow cylinder, and the internal power connection terminal extends into the inner cavity of the shell.

4. The battery with dense tabs according to claim 3, characterized in that: It includes a sealed insulating structure, which is arranged between the positive pole and the shell to form an insulating layer; The sealed insulating structure includes a protective ring, a sealing ring and an insulating sheet. The protective ring is arranged between the shell and the external power terminal and / or the hollow cylinder, the sealing ring is arranged between the shell and the internal power terminal and / or the hollow cylinder, and the insulating sheet is arranged between the shell and the sealing ring.

5. The battery with dense tabs according to claim 1, characterized in that: A plurality of positive electrode flexible ear plates are radially arranged around the center of the positive electrode collector sheet body, the connection end of the positive electrode flexible ear plate is arranged close to the center of the positive electrode collector sheet body, and the free end of the positive electrode flexible ear plate is arranged away from the center of the positive electrode collector sheet body; A plurality of negative flexible ear plates are radially arranged around the center of the negative current collector body, the connection end of the negative flexible ear plate is arranged close to the center of the negative current collector body, and the free end of the negative flexible ear plate is arranged away from the center of the negative current collector body.

6. The battery with dense tabs according to claim 2, characterized in that: It includes a positive terminal cover and a negative terminal cover, the positive terminal cover and the negative terminal cover are respectively arranged at the two ends of the inner cavity of the shell, and the positive terminal cover and the negative terminal cover are both connected to the shell, the positive terminal cover is connected to the positive electrode collector body to form a positive electrode collector, the negative terminal cover is connected to the negative electrode collector body to form a negative electrode collector, the battery cell is arranged between the positive electrode collector and the negative electrode collector, and the shell, the positive electrode collector and the negative electrode collector perform axial positioning and radial positioning on the battery cell; The positive terminal cover is provided with a first avoidance hole, which provides a floating space for the positive flexible ear plate, and the negative terminal cover is provided with a second avoidance hole, which provides a floating space for the negative flexible ear plate.

7. The battery with dense tabs according to claim 6, characterized in that: The battery comprises a bottom cover, which is arranged close to the negative terminal cover and connected to the shell, a positioning column is arranged on the bottom cover, a first through hole is arranged on the negative terminal cover, a second through hole is arranged on the negative electrode collector, and the positioning column extends into the core of the battery cell through the first through hole and the second through hole.

8. The battery with dense tabs according to claim 7, characterized in that: The battery cell winding body is covered with an insulating sheath, the innermost layer of the battery cell winding body is a cathode sheet, the positioning post abuts against the cathode sheet located at the innermost layer of the battery cell winding body, and the insulating sheath and the positioning post radially position the battery cell winding body.

9. The battery with dense tabs according to claim 7, characterized in that: The bottom cover is provided with at least one heat dissipation recess; The bottom cover is provided with at least one positioning protrusion, and the negative end cover is provided with a third through hole matched with the positioning protrusion, and the positioning protrusion realizes the connection between the bottom cover and the negative end cover through the third through hole; The bottom cover is provided with an explosion-proof groove, and the area surrounded by the explosion-proof groove is an explosion-proof cover.

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