U-shaped multi-tab high-magnification square lithium battery and electronic equipment

Abstract

The utility model discloses a U-shaped multi-tab high-magnification square lithium battery and electronic equipment, the battery comprises a shell with an opening at one end, a cover plate covering the opening of the shell and a roll core positioned in the shell, the positive tab cluster and the negative tab cluster of the roll core are positioned at the same end of the roll core and are both U-shaped, and the number of the positive tab cluster and the number of the negative tab cluster are both 1; the cover plate comprises a cover plate main body, a positive current collection base, a positive pole, a positive current collection welding column connected with the positive current collection base and the positive lug cluster, a negative current collection base, a negative pole and a negative current collection welding column connected with the negative current collection base and the negative lug cluster, the positive current collection welding column is located in the positive lug cluster and matched with the positive lug cluster in shape, and the negative current collection welding column is located in the negative lug cluster and matched with the negative lug cluster in shape. And the shape is matched with the negative tab cluster. The lithium battery disclosed by the utility model is easy to realize welding and good in welding effect, and is easy to manufacture; and the high current-carrying capacity and the large battery energy density of the square lithium battery are also considered.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely relates to a U-shaped multi-tab high rate square lithium battery and electronic equipment. BACKGROUND

[0002] High rate lithium battery usually refers to the rate greater than 3C. The tab of the positive / negative electrode and the pole of the battery of high rate lithium battery need to be able to bear super large working current during charging and discharging, and also need to use the tab of the positive / negative electrode with large current-carrying area and the pole of the battery. If there is a current collection pad or a current collection column or a current collection block, these current collection pads or current collection columns or current collection blocks also need to be able to bear super large working current. The "bear super large working current" here refers to that when the tab, the current collection pad / current collection column / current collection block bearing super large working current passes through super large current, the tab, the current collection pad / current collection column / current collection block will not produce too much heat due to its own ohmic resistance and the passing large current, which will not cause the temperature of the tab, the current collection pad / current collection column / current collection block to rise too much, affecting the performance and safety of the battery.

[0003] Multi-tab high rate square lithium battery is usually divided into two types, one is multi-tab square lithium battery with positive and negative electrodes at the same end, and the other is full-tab square lithium battery with positive and negative electrodes at different ends.

[0004] The conventional multi-tab square lithium battery with positive and negative electrodes at the same end has the following problems. For the multi-tab square lithium battery with conventional winding structure, the upper half of the wound cell has a tab and the lower half has no tab (see Figure 1 ), or the wound cell has only one tab per winding. The width of the tab cannot exceed the difference between half of the width of the square lithium battery and half of the thickness of the square lithium battery. The number of tabs is small. The maximum number of tabs of the wound structure square lithium battery is only equivalent to the number of winding turns. The area of the gathered tabs carrying current is small, which cannot meet the requirement of carrying large current in high power discharge. In the case of high power charging and discharging, the heat generated by the tab will be too large, and the temperature rise will be too high, which will affect the performance and safety of the square lithium battery. For the multi-tab square lithium battery with laminated structure, the die cutting efficiency and the laminating efficiency are low, resulting in high equipment investment cost and manufacturing cost of the laminating process, which weakens the cost competitive advantage of the square lithium battery. However, each positive / negative electrode sheet of the laminated structure has a die-cut tab, which is equivalent to double the number of tabs of the wound structure cell. The laminated cell is shown in Figure 2; although the number of tabs of the multi-tab square lithium battery with the positive and negative electrodes at the same end is doubled compared with the multi-tab square lithium battery with the winding structure, the multi-tab square lithium battery with the positive and negative electrodes at the same end needs to leave a side space for assembly due to the limitation of the space at the top end of the square lithium battery, and the middle area at the top end of the lithium battery cannot be occupied as the space insulation isolation area of the positive and negative electrode tabs, and the positive and negative tabs can only occupy the areas on the left and right sides of the square lithium battery, the width of the tab is limited to a small area due to the limitation of the physical space, the width of the tab of the multi-tab square battery with the winding structure cannot exceed the difference between the width of the square lithium battery / 2 and the safe side distance of the top end of the square lithium battery, the number of tabs and the width of the tabs obtained, the total thickness and width of the gathered tab clusters still provide a small area for carrying current, which affects the current carrying capacity of the battery, and cannot meet the requirement of carrying large current for high-power discharge, and the heat generation of the tab will be too large under the condition of high-power charge and discharge, which will affect the performance and safety of the square lithium battery.

[0005] The full-tab square lithium battery with the positive and negative electrodes at different ends, in order to solve the problem of tab current carrying, the positive tab and the negative tab are respectively arranged at the two ends of the lithium battery, see Figure 3 , the positive electrode is double-sided coated with positive active material on one side of the aluminum foil (current collector), and the other side is an empty aluminum foil (current collector), Figure 3 , from top to bottom, the positive tab, the aluminum oxide insulation layer, and the active material coating area; see Figure 4 , the negative electrode is double-sided coated with negative active material on one side of the copper foil (current collector), and the other side is an empty copper foil (current collector), Figure 4 , from top to bottom, the negative tab and the active material coating area; when the square cell is wound or stacked, the positive and negative electrodes are separated by the separator and wound or stacked, and the empty aluminum foil of the positive electrode and the empty copper foil of the negative electrode are respectively placed at the two ends of the wound / stacked cell for winding / stacking, the separator covers the active material coating area of the positive and negative electrodes in the width direction, and the positive and negative aluminum / empty copper foils at the two ends of the wound / stacked cell are used as the positive / negative tab, see Figure 5In a full-tab lithium battery, the product of the thickness and length of the aluminum / copper foil used for the positive and negative current collectors is the area of ​​the tab that carries the current. This means that a full-tab square lithium battery with opposite positive and negative electrodes occupies twice the tab space compared to a conventional multi-tab square lithium battery with the same positive and negative electrodes. It utilizes the entire length of the aluminum / copper foil along the positive and negative electrode sheet as the tab, significantly increasing the current-carrying area. Since the full-tab square lithium battery uses the side of the entire length of the aluminum / copper foil along the positive and negative electrode sheet as the tab, the increased tab current-carrying area is capped by the current-carrying area of ​​the square lithium battery's terminals. If the current-carrying area of ​​the full-tab exceeds the current-carrying area of ​​the square lithium battery's terminals, the bottleneck for high-current operation of the square lithium battery becomes the current-carrying area of ​​the lithium battery terminals. The high-power square lithium battery with an all-tab structure has a lower energy density than a multi-tab lithium battery with the same positive and negative electrodes. This is because the two ends of the wound / stacked cell are occupied by empty aluminum or copper foil, which does not contribute to the battery capacity. In other words, the effective volume of the battery used to load the positive and negative electrode active materials is reduced.

[0006] It is evident that existing technologies do not have a square lithium battery that can balance energy density and current carrying capacity. Therefore, it is necessary to provide a multi-tab high-rate square lithium battery to overcome the shortcomings of existing technologies. Summary of the Invention

[0007] The purpose of this invention is to provide a U-shaped multi-tab high-rate square lithium battery and electronic device, aiming to solve the problem that current square lithium batteries cannot simultaneously achieve energy density and current carrying capacity.

[0008] To achieve the above objectives, this utility model provides a U-shaped multi-tab high-rate square lithium battery, comprising: a shell with an opening at one end, a cover plate covering the opening of the shell, and a core located inside the shell. The positive and negative tab clusters of the core are located at the same end of the core, both are U-shaped, and each has one tab. The cover plate includes a cover plate body, a positive current collector base disposed on the cover plate body, a positive electrode post disposed on the cover plate body and connected to the positive current collector base, a positive current welding post connecting the positive current collector base and the positive tab cluster, a negative current collector base disposed on the cover plate body, a negative electrode post disposed on the cover plate body and connected to the negative current collector base, and a negative current welding post connecting the negative current collector base and the negative tab cluster. The positive current welding post is located in the positive tab cluster, and the shape of the positive current welding post is adapted to the positive tab cluster. The negative current welding post is located in the negative tab cluster, and the shape of the negative current welding post is adapted to the negative tab cluster.

[0009] In a preferred embodiment, the positive current collector post is V-shaped on the side facing the bottom of the U-shaped positive electrode cluster.

[0010] In a preferred embodiment, the positive pole post and the negative pole post are located outside the cover plate body, and the positive current collecting base and the negative current collecting base are located inside the cover plate body.

[0011] In a preferred embodiment, the lithium battery further comprises a first welding auxiliary metal sheet and a second welding auxiliary metal sheet, the first welding auxiliary metal sheet is welded on the outer surface of the positive tab cluster and is arranged corresponding to the positive current collecting welding post, and the second welding auxiliary metal sheet is welded on the outer surface of the negative tab cluster and is arranged corresponding to the negative current collecting welding post.

[0012] In a preferred embodiment, the connection of the positive tab cluster and the positive current collecting welding post, the connection of the negative tab cluster and the negative current collecting welding post, the welding of the first welding auxiliary metal sheet and the positive tab cluster, and the welding of the second welding auxiliary metal sheet and the negative tab cluster are all ultrasonic welding, resistance welding or rivet welding.

[0013] In a preferred embodiment, the positive tab cluster comprises a plurality of U-shaped positive tabs, a part of the positive tab is located above the aluminum foil of the corresponding positive sheet, and the included angle between the side edge of the part of the positive tab located above the aluminum foil and the upper edge of the aluminum foil is greater than 60° and less than 90°, and the cover plate is located above the positive sheet.

[0014] In a preferred embodiment, all the side edges in the positive tab cluster are coplanar, and the side edges are the side edges of the part of the positive tab located above the aluminum foil.

[0015] In a preferred embodiment, the negative tab cluster comprises a plurality of U-shaped negative tabs, a part of the negative tab is located above the copper foil of the corresponding negative sheet, and the included angle between the side edge of the part of the negative tab located above the copper foil and the upper edge of the copper foil is greater than 60° and less than 90°, and the cover plate is located above the negative sheet.

[0016] In a preferred embodiment, all the side edges in the negative tab cluster are coplanar, and the side edges are the side edges of the part of the negative tab located above the copper foil.

[0017] The utility model also provides an electronic equipment, including equipment body and the lithium battery of power supply for equipment body, the lithium battery adopts the one U shape multi -pole ear high rate square lithium battery.

[0018] Compared with the prior art, the U-shaped multi-pole ear high-multiplying square lithium battery and electronic equipment have the beneficial effects that the lithium battery has U-shaped positive pole ear clusters and U-shaped negative pole ear clusters at the same end of the winding core, has current collecting welding columns adapted to the pole ear clusters, so that the welding columns and the pole ear clusters are easily welded and have good welding effect, and the battery is easy to manufacture; the current carrying capacity and the energy density of the square lithium battery are considered, specifically, compared with the prior art of the square lithium battery with the positive and negative electrodes at the same end, the effective current carrying width of each pole ear is expanded, the pole ear current carrying area is greatly improved, the battery can meet the requirement of high power discharge and large current carrying, helps to reduce the heat generation and temperature rise of the square lithium battery during large current discharge, ensures the performance and safety of the battery under high power charge and discharge, compared with the square lithium battery with all pole ears and different positive and negative electrodes, the pole ear occupies less space, and the energy density of the square lithium battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure schematic view of the winding core with the positive and negative electrodes at the same end;

[0020] Figure 2 The structure schematic view of the laminated core;

[0021] Figure 3 The positive electrode sheet structure schematic view of the square lithium battery with all pole ears and different positive and negative electrodes;

[0022] Figure 4 The negative electrode sheet structure schematic view of the square lithium battery with all pole ears and different positive and negative electrodes;

[0023] Figure 5 The structure schematic view of the winding core with the positive and negative electrodes at different ends;

[0024] Figure 6 The ungroup state schematic view of the lithium battery provided by the utility model;

[0025] Figure 7 The structure view of the lithium battery winding core provided by the utility model;

[0026] Figure 8 The winding before structure schematic view of the positive electrode sheet of the lithium battery winding core provided by the utility model;

[0027] Figure 9 The winding before partial structure schematic view of the positive electrode sheet of the lithium battery winding core provided by the utility model;

[0028] Figure 10 The winding before structure schematic view of the negative electrode sheet of the lithium battery winding core provided by the utility model;

[0029] Figure 11A schematic diagram of the partial structure of the negative electrode sheet of the lithium battery core provided by this utility model before winding.

[0030] Figure 12 This is a side view of the lithium battery cover provided by this utility model;

[0031] Figure 13 A schematic diagram of the lithium battery tab cluster welding method provided by this utility model;

[0032] The diagram is labeled as follows: 100, core; 11, positive electrode sheet; 111, positive electrode tab; 112, alumina insulating layer; 113, positive electrode active material coating area; 12, positive electrode tab cluster; 13, negative electrode sheet; 131, negative electrode tab; 132, negative electrode active material coating area; 14, negative electrode tab cluster; 200, cover plate; 21, cover plate body; 22, positive current collector base; 23, positive electrode post; 24, positive current collector welding post; 25, negative current collector base; 26, negative current collector welding post; 27, first welding auxiliary metal sheet; 300, shell. Detailed Implementation

[0033] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the present utility model and are not intended to limit the present utility model.

[0034] In an embodiment of this utility model, a U-shaped multi-tab high-rate square lithium battery is provided.

[0035] Please see Figure 6 The lithium battery includes: a housing 30 with an opening at one end, a cover plate 200 covering the opening of the housing 30, and a core 100 located inside the housing 30. The positive electrode tabs 12 and negative electrode tabs 14 of the core 100 are located at the same end of the core 100, are both U-shaped, and are all 1 in number. Figure 6 The diagram shows the cover plate 200, housing 30, and core 100 in their unassembled state. The cover plate 200 includes a cover plate body 21, a positive current collector base 22 disposed on the cover plate body 21, a positive electrode post 23 disposed on the cover plate body 21 and connected to the positive current collector base 22, a positive current collector welding post 24 connecting the positive current collector base 22 and the positive electrode ear cluster 12, a negative current collector base 25 disposed on the cover plate body 21, a negative electrode post disposed on the cover plate body 21 and connected to the negative current collector base 25, and a negative current collector welding post 26 connecting the negative current collector base 25 and the negative electrode ear cluster 14. The positive current collector welding post 24 is located in the positive electrode ear cluster 12, and the shape of the positive current collector welding post 24 is adapted to the positive electrode ear cluster 12. The negative current collector welding post 26 is located in the negative electrode ear cluster 14, and the shape of the negative current collector welding post 26 is adapted to the negative electrode ear cluster 14.

[0036] Please seeFigure 7 The core 100 comprises: a positive electrode sheet 11, a negative electrode sheet 13, a separator between the positive electrode sheet 11 and the negative electrode sheet 13, the positive electrode sheet 11 has a plurality of positive electrode tabs 111, the negative electrode sheet 13 has a plurality of negative electrode tabs 131, all the positive electrode tabs 111 form a U-shaped positive electrode tab cluster 12, all the negative electrode tabs 131 form a U-shaped negative electrode tab cluster 14, that is, the positive electrode tab cluster 12 comprises a plurality of U-shaped positive electrode tabs 111, the negative electrode tab cluster 14 comprises a plurality of U-shaped negative electrode tabs 131, the positive electrode tab cluster 12 and the negative electrode tab cluster 14 are located at the same end of the core 100. The number of the positive electrode tab cluster 12 on each core 100 is 1, and the number of the negative electrode tab cluster 14 is 1.

[0037] It can be understood that the core 100 of the square lithium battery is flat.

[0038] The positive electrode tab cluster 12 and the negative electrode tab cluster 14 are located at the same end of the whole core 100, which is referred to as being located at the upper end of the core 100. A part of the positive electrode tab 111 is located above the aluminum foil of the corresponding positive electrode sheet 11, and a part of the negative electrode tab 131 is located above the copper foil of the corresponding negative electrode sheet 13.

[0039] Before being wound into the core 100, the structure of the positive electrode sheet 11 is shown in Figure 8 As an example, it can be understood that the positive electrode sheet 11 comprises an aluminum foil, the positive electrode sheet 11 comprises, from top to bottom, a positive electrode tab 111, an aluminum oxide insulating layer 112, and a positive electrode active material coating area 113, the aluminum oxide insulating layer 112 and the positive electrode active material coating area 113 are coated on the surface of the aluminum foil, and it can be understood that the lower end of the positive electrode tab 111 is connected to the aluminum foil. In another embodiment, the positive electrode sheet 11 comprises, from top to bottom, a positive electrode tab 111 and a positive electrode active material coating area 113, and the positive electrode active material coating area 113 is coated on the surface of the aluminum foil.

[0040] Referring to Figure 9 Specifically, the part of the positive electrode tab 111 located above the aluminum foil before being wound into the core 100 is a trapezoid, which is referred to as a first trapezoid for distinction, and the upper base of the first trapezoid is farther away from the positive electrode active material coating area 113 of the positive electrode sheet 11 than the lower base of the first trapezoid; the angles of the two bottom corners of the first trapezoid are both greater than 60° and less than 90°; and generally, the first trapezoid is an isosceles trapezoid. It can be understood that after the core 100 is wound, the included angle between the side of the part of the positive electrode tab 111 located above the corresponding aluminum foil and the upper edge of the aluminum foil is greater than 60° and less than 90°.

[0041] After winding, the positive tab 111 becomes a U-shaped positive tab, at this time, all the side edges of the U-shaped positive tab cluster 12 are coplanar, the side edges are the side edges of the part of the positive tab 111 above the aluminum foil, that is, after winding of the first trapezoid, the two side edges (the waist of the first trapezoid) are coplanar, and all the two side edges of the first trapezoid are located on the same plane.

[0042] Before winding into the winding core 100, the structure of the negative tab 13 is shown in Figure 10 As an example, it can be understood that the negative tab 13 includes a copper foil, and the negative tab 13 includes a negative tab 131, a negative active material coating area 132 arranged in sequence from top to bottom, and the negative active material coating area 113 is coated on the surface of the copper foil. It can be understood that the lower end of the negative tab 131 is connected to the copper foil.

[0043] Referring to Figure 11 Specifically, the part of the negative tab 131 above the copper foil before winding into the winding core 100 is a trapezoid, which is referred to as a second trapezoid for distinction. Compared to the lower base of the second trapezoid, the upper base of the second trapezoid is away from the negative active material coating area 132 of the negative tab 13; the angles of the two bottom corners of the second trapezoid are both greater than 60° and less than 90°; usually, the second trapezoid is an isosceles trapezoid. It can be understood that after winding to obtain the winding core 100, the included angle between the side edge of the part of the negative tab 131 above the corresponding copper foil and the upper edge of the copper foil is greater than 60° and less than 90°.

[0044] After winding, the negative tab 131 becomes a U-shaped negative tab, at this time, all the side edges of the U-shaped negative tab cluster 14 are coplanar, the side edges are the side edges of the part of the negative tab 131 above the copper foil, that is, after winding of the second trapezoid, the two side edges (the waist of the second trapezoid) are coplanar, and all the two side edges of the second trapezoid are located on the same plane.

[0045] It can be understood that the U-shaped described herein can be understood as U-shaped in the top view.

[0046] Please refer to Figure 12 and Figure 6 The positive column 23 and the negative column are located outside the cover plate body 21, and the positive current collecting base 22 and the negative current collecting base 25 are located inside the cover plate body 21.

[0047] The cover plate 200 comprises a cover plate body 21, a positive current collection base 22 arranged on the inner side of the cover plate body 21, a positive pole 23 connected to the positive current collection base 22, a positive current collection welding column 24, a negative current collection base 25 arranged on the inner side of the cover plate body 21, a negative pole connected to the negative current collection base 25, a negative current collection welding column 26, the positive current collection welding column 24 and the negative current collection welding column 26 are located on the inner side corresponding to the current collection base, the outer side of the current collection base is connected to the inner side of the cover plate body 21, and the main body part of the positive pole 23 and the negative pole is located on the outer side of the cover plate body 21. It can be understood that the inner side of the cover plate body 21 corresponds to the face towards the inside of the shell 30.

[0048] Here, the connection mode of each component in the cover plate 200 is not limited. For example, connection holes are provided on the current collection base and the cover plate body 21 for mounting the corresponding pole, and each of the poles is adapted to be mounted on the cover plate 200 through the corresponding pole base. The structure such as the liquid injection hole on the cover plate body 21 belongs to the prior art and will not be described in detail here.

[0049] Here, the main body material of the shell 300 is an aluminum alloy material or a steel material, and the main body material of the cover plate 200 is an aluminum alloy material or a steel material.

[0050] The positive current collection welding column 24 and the negative current collection welding column 26 are located in the corresponding tab cluster, which can be partially located in the tab cluster or entirely located in the tab cluster.

[0051] The shape of the positive current collection welding column 24 is adapted to the positive tab cluster 12, and the shape of the negative current collection welding column 26 is adapted to the negative tab cluster 14. The positive current collection welding column 24 and the negative current collection welding column 26 can be collectively referred to as a current collection welding column.

[0052] As a preferred embodiment, the current collection welding column can be large-area attached to the inner surface of the tab cluster.

[0053] Here, the shape of the current collection welding column can be a cuboid, but preferably, as shown in Figure 6 , one side of the positive current collection welding column 24 towards the U-shaped bottom of the positive tab cluster 12 is V-shaped, and one side of the negative current collection welding column 26 towards the U-shaped bottom of the negative tab cluster 14 is V-shaped; in another preferred embodiment, one side of the positive current collection welding column 24 towards the U-shaped bottom of the positive tab cluster 12 is U-shaped, and one side of the negative current collection welding column 26 towards the U-shaped bottom of the negative tab cluster 14 is U-shaped. The U-shaped bottom is the inner side of the tab cluster and is the arc side of the U shape. The shape adaptation facilitates the insertion of the current collection welding column into the U-shaped tab cluster, so that the U-shaped tab cluster covers the current collection welding column, which is beneficial to the welding operation and effect of the current collection welding column and the tab cluster.

[0054] As a preferred embodiment, as shown in Figure 13The lithium battery further comprises a first welding auxiliary metal sheet 27 and a second welding auxiliary metal sheet, the first welding auxiliary metal sheet 27 is welded on the outer surface of the positive tab cluster 12 and is arranged corresponding to the positive current collecting welding column 24, the number of the first welding auxiliary metal sheet 27 is two, and the two first welding auxiliary metal sheets 27 are arranged on the two sides of the positive tab cluster 12; the second welding auxiliary metal sheet is welded on the outer surface of the negative tab cluster 14 and is arranged corresponding to the negative current collecting welding column 26, the number of the second welding auxiliary metal sheet is two, and the two second welding auxiliary metal sheets are arranged on the two sides of the negative tab cluster 14. Specifically, the material of the welding auxiliary metal sheet is the same as the material of the corresponding tab, here, the material of the first welding auxiliary metal sheet 27 is aluminum material, and the material of the second welding auxiliary metal sheet is copper material.

[0055] In another preferred embodiment, the welding auxiliary metal sheet is not required to be used when welding, that is, the welding auxiliary metal sheet is not used Figure 13 slightly different, not required to use welding auxiliary metal sheet when welding, that is, not using Figure 13 The first welding auxiliary metal sheet 27 and the second welding auxiliary metal sheet 27, the positive current collecting welding column 24 is V-shaped toward one side of the U-shaped bottom of the positive tab cluster 12, and the negative current collecting welding column 26 is V-shaped toward one side of the U-shaped bottom of the negative tab cluster 14; or the positive current collecting welding column 24 is U-shaped toward one side of the U-shaped bottom of the positive tab cluster 12, and the negative current collecting welding column 26 is U-shaped toward one side of the U-shaped bottom of the negative tab cluster 14.

[0056] The connection of the positive tab cluster 12 and the positive current collecting welding column 24, the connection of the negative tab cluster 14 and the negative current collecting welding column 26, the welding of the first welding auxiliary metal sheet 27 and the positive tab cluster 12, and the welding of the second welding auxiliary metal sheet and the negative tab cluster 14 in the embodiment are all ultrasonic welding, resistance welding or riveting welding. Specifically, the welding between the first welding auxiliary metal sheet 27, the positive tab cluster 12 and the positive current collecting welding column 24 is vertical welding, and the welding between the second welding auxiliary metal sheet, the negative tab cluster 14 and the negative current collecting welding column 26 is vertical welding.

[0057] In conclusion, the U-shaped multi-tab high-rate square lithium battery has the U-shaped positive tab cluster 12 and the U-shaped negative tab cluster 14 located at the same end, and has the current collecting welding column matched with the tab cluster, so that, compared with the existing square lithium battery with the positive and negative electrodes at the same end, the effective current carrying width of each tab is expanded, the tab current carrying area is greatly improved, the battery can meet the requirement of carrying large current in high power discharge, the heat emission and temperature rise of the square lithium battery in large current discharge are reduced, and the performance and safety of the battery in high power charge and discharge are ensured; meanwhile, compared with the full-tab square lithium battery with the positive and negative electrodes at different ends, the tab occupying space is reduced, and the energy density of the square lithium battery is improved, the tab current carrying area can meet the current carrying requirement of high power discharge, and the performance and safety of the battery are not affected, that is, the current carrying capacity and the battery energy density of the square lithium battery are considered in the utility model, the current collecting welding column and the tab cluster are easy to be welded and have good welding effect, and the battery is easy to be manufactured. In addition, the design of the utility model will not cause the tab current carrying area to be obviously larger than the tab current carrying area of the square lithium battery. The utility model is suitable for realizing various battery capacities and has wide application range.

[0058] The utility model also provides an electronic equipment, the electronic equipment includes device body and the U-shaped multi-tab high-rate square lithium battery of any one embodiment, square lithium battery is the device body power supply. Can understand, after the electronic equipment adopts the above-mentioned U-shaped multi-tab high-rate square lithium battery, makes the electronic equipment durable and safe performance is high.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0060] In the utility model, unless otherwise specified and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specified. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0061] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0062] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A U-shaped multi-tab high-rate square lithium battery, characterized in that, include: The device comprises a shell with an opening at one end, a cover plate covering the opening of the shell, and a core located inside the shell. The positive and negative electrode lugs of the core are located at the same end of the core, are both U-shaped, and are all one in number. The cover plate includes a cover plate body, a positive current collector base disposed on the cover plate body, a positive electrode post disposed on the cover plate body and connected to the positive current collector base, a positive current collector welding post connecting the positive current collector base and the positive electrode lugs, a negative current collector base disposed on the cover plate body, a negative electrode post disposed on the cover plate body and connected to the negative current collector base, and a negative current collector welding post connecting the negative current collector base and the negative electrode lugs. The positive current collector welding post is located in the positive electrode lugs and its shape is adapted to the positive electrode lugs. The negative current collector welding post is located in the negative electrode lugs and its shape is adapted to the negative electrode lugs.

2. The U-shaped multi-tab high-rate square lithium battery as described in claim 1, characterized in that, The positive current collector welding post is V-shaped on one side facing the bottom of the U-shaped positive electrode ear cluster.

3. A U-shaped multi-tab high-rate square lithium battery as described in claim 1, characterized in that, The positive and negative terminals are located on the outside of the cover plate body, while the positive current collector and negative current collector are located on the inside of the cover plate body.

4. A U-shaped multi-tab high-rate square lithium battery as described in claim 1, characterized in that, The lithium battery further includes a first welding auxiliary metal sheet and a second welding auxiliary metal sheet. The first welding auxiliary metal sheet is welded to the outer surface of the positive electrode tab cluster and is arranged corresponding to the positive current collector welding post. The second welding auxiliary metal sheet is welded to the outer surface of the negative electrode tab cluster and is arranged corresponding to the negative current collector welding post.

5. A U-shaped multi-tab high-rate square lithium battery as described in claim 4, characterized in that, The connection between the positive electrode lug and the positive current collector, the connection between the negative electrode lug and the negative current collector, the welding of the first welding auxiliary metal sheet and the positive electrode lug, and the welding of the second welding auxiliary metal sheet and the negative electrode lug are all ultrasonic welding, resistance welding, or riveting welding.

6. A U-shaped multi-tab high-rate square lithium battery as described in claim 1, characterized in that, The positive electrode cluster includes multiple U-shaped positive electrode tabs. A portion of the positive electrode tab is located above the aluminum foil of its corresponding positive electrode sheet. The angle between the side of the portion of the positive electrode tab above its corresponding aluminum foil and the upper edge of the aluminum foil is greater than 60° and less than 90°. The cover plate is located above the positive electrode sheet.

7. A U-shaped multi-tab high-rate square lithium battery as described in claim 6, characterized in that, All sides of the positive electrode cluster are coplanar, and the side refers to the side of the portion of the positive electrode located above its corresponding aluminum foil.

8. A U-shaped multi-tab high-rate square lithium battery as described in claim 1, characterized in that, The negative electrode tab cluster includes multiple U-shaped negative electrode tabs. A portion of the negative electrode tab is located above the copper foil of its corresponding negative electrode sheet. The angle between the side of the portion of the negative electrode tab above its corresponding copper foil and the upper edge of the copper foil is greater than 60° and less than 90°. The cover plate is located above the negative electrode sheet.

9. A U-shaped multi-tab high-rate square lithium battery as described in claim 8, characterized in that, All sides of the negative electrode tab cluster are coplanar, and the side refers to the side of the portion of the negative electrode tab located above its corresponding copper foil.

10. An electronic device, characterized in that, It includes a device body and a lithium battery that powers the device body, wherein the lithium battery is a U-shaped multi-tab high-rate square lithium battery as described in any one of claims 1-9.

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