All-tab battery

Abstract

The utility model relates to a full-tab battery, the full-tab battery comprises a battery cell, a shell and a top cover assembly, the battery cell comprises a main body part and a tab piece which are connected, the main body part is used for supplying power through the tab piece, and a connecting hole is formed in the tab piece; the battery cell is arranged in the shell; the top cover assembly is connected to one end of the shell, the top cover assembly comprises an electrode piece and battery pins, the battery pins comprise at least one outer pin and at least one inner pin, one end of each outer pin and one end of each inner pin are both connected with the electrode piece, and the electrode piece is connected with the outer pin. One surface, close to the tab piece, of the outer pin is connected with the outer surface of the tab piece, and the inner pin is connected with the inner surface of the connecting hole. According to the full-tab battery provided by the invention, the inner pin is connected with the inner surface of the tab piece, so that the contact area of the battery pin and the tab piece is enlarged, and the overcurrent capability of the battery pin is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery technology, in particular to a full-tab battery. BACKGROUND

[0002] With the increasing demand for renewable energy and the growing awareness of environmental protection, the innovation and development of battery technology have become an important field of modern technology. Among the many types of batteries, high-power full-tab batteries play an important role in modern technology and industrial applications, especially in electric vehicles, power tools, heavy machinery and equipment, etc. However, with the increasing demand for power, the requirement for the overcurrent capacity of the full-tab battery pin is further improved. When the overcurrent capacity of the full-tab battery pin is insufficient, the temperature of the full-tab battery pin will rise during high-rate charging and discharging, affecting the safety performance and service life of the full-tab battery. CONTENT OF THE UTILITY MODEL

[0003] The embodiment of the present application provides a full-tab battery to improve the overcurrent capacity of the battery pin.

[0004] According to an embodiment of the present application, a full-tab battery is provided, comprising: an electric core, the electric core comprising a main body part and a tab part connected, the main body part being used to supply power through the tab part, the tab part being provided with a connecting hole; a shell, the electric core being installed in the shell; a top cover assembly, the top cover assembly being connected to one end of the shell, the top cover assembly comprising an electrode part and a battery pin, the battery pin comprising at least one outer pin and at least one inner pin, one end of the outer pin and one end of the inner pin being connected with the electrode part, one side of the outer pin close to the tab part being connected with the outer surface of the tab part, and the inner pin being connected with the inner surface of the connecting hole.

[0005] According to an embodiment of the present application, the outer pin comprises a first pin and a second pin, one end of the first pin and one end of the second pin being connected with the electrode part, the first pin and the second pin being respectively located on the opposite sides of the inner pin, the outer surface of the tab part comprising a first connecting surface and a second connecting surface arranged opposite to each other, the inner surface of the connecting hole comprising a third connecting surface and a fourth connecting surface arranged opposite to each other, the first pin being connected with the first connecting surface, the second pin being connected with the second connecting surface, and the opposite sides of the inner pin being connected with the third connecting surface and the fourth connecting surface respectively.

[0006] According to an embodiment of the present application, the inner pin is provided with a avoiding slot, and the tab part is provided with a transition section close to one end of the electrode part, the transition section being inserted into the avoiding slot.

[0007] According to one embodiment of this application, the length of the clearance groove is greater than or equal to the thickness of the transition section.

[0008] According to one embodiment of this application, both the outer surface of the tab and the inner surface of the connection hole are provided with a connection area. The connection area is used to be attached to the battery pin. The length of the connection area is greater than or equal to three-quarters of the length of the tab, and the width of the connection area is greater than or equal to three-quarters of the width of the tab.

[0009] According to one embodiment of this application, the thickness of both the inner pin and the outer pin ranges from 0.2 mm to 0.5 mm.

[0010] According to one embodiment of this application, the outer pin includes a bent portion and a connecting portion connected together. An isolation member is provided between the battery cell and the electrode. The isolation member is used to separate the battery cell and the electrode. The bent portion is connected to the electrode. One side of the connecting portion is connected to the outer surface of the tab. The bent portion and the electrode form a clearance space. The isolation member is at least partially located within the clearance space.

[0011] According to one embodiment of this application, the bending portion includes a first segment and a second segment, the first segment is parallel to the connecting portion, the second segment is connected between the first segment and the connecting portion, and the first segment is further away from the tab than the connecting portion to avoid the isolator.

[0012] According to one embodiment of this application, the top cover assembly includes a cover body covering one end of the housing. The top cover assembly also includes two electrode components and two battery pins. The two electrode components are positive and negative electrodes, respectively, and are located at both ends of the cover body. The two battery pins are respectively connected to both ends of the battery cell and are connected to the two electrode components one-to-one.

[0013] According to one embodiment of this application, a connector is connected between the end of the first pin away from the electrode and the end of the second pin away from the electrode, and the inner pin is located between the connector and the electrode.

[0014] The all-tab battery provided in this application connects the outer pin to the outer surface of the tab and the inner pin to the inner surface of the tab, thereby significantly increasing the contact area between the battery pin and the tab and further improving the current carrying capacity of the battery pin. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the all-tab battery of this application;

[0017] Figure 2 yes Figure 1 A partial structural schematic diagram of the all-tab battery shown.

[0018] Figure 3 yes Figure 1 Another partial structural diagram of the polytab battery shown;

[0019] Figure 4 yes Figure 1 A schematic diagram of the top cover assembly of the all-tab battery shown.

[0020] Figure 5 yes Figure 4 A schematic diagram of the internal pin structure of the top cover assembly shown;

[0021] Figure 6 yes Figure 4 A structural schematic diagram of the top cover assembly from another angle is shown;

[0022] Figure 7 This is a data graph showing the discharge rate test results of the all-tab battery of this application and a conventional all-tab battery. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0024] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] This application provides a multi-tab battery, such as... Figures 1 to 4As shown, the all-tab battery includes a cell 10, a housing 30, and a top cover assembly 20. The cell 10 is installed inside the housing 30 and includes a main body 110 and a tab 120 connected to each other. The tab 120 is provided with a connection hole 1201. The top cover assembly 20 is connected to one end of the housing 30 and includes an electrode 210 and battery pins 220. The battery pins 220 include at least one outer pin 221 and at least one inner pin 222. One end of the outer pin 221 and one end of the inner pin 222 are both connected to the electrode 210. The side of the outer pin 221 near the tab is connected to the outer surface of the tab 120, and the inner pin 222 is connected to the inner surface of the connection hole 1201. This application utilizes the connection hole 1201 provided in the tab 120, and by setting the inner pin 222 to connect with the inner surface of the connection hole 1201, the contact area between the battery pin 220 and the tab 120 is significantly expanded, improving the overcurrent capacity of the battery pin 220 and effectively reducing the temperature rise effect. This supports the high power performance of the all-tab battery and improves its safety performance and lifespan. High power refers to the all-tab battery's ability to provide a large current output in a short time while maintaining high energy density, making it suitable for high-load devices and high-power demand scenarios.

[0027] Specifically, the main body 110 can generate electrical energy through a chemical reaction, and the main body 110 is used to supply power to external electrical devices through the tab 120.

[0028] Specifically, cell 10 is a wound core, and it is wound using full-tab technology, meaning that tab 120 is a full-tab battery. Full-tab technology is a technique used in the manufacture of full-tab batteries, designed to improve the performance of full-tab batteries by modifying the current conduction path. It is understood that the full-tab in this application refers to a full-tab structure formed using full-tab technology. In traditional full-tab batteries, current is drawn from the positive and negative copper or aluminum foils through a single tab. This results in a longer current conduction path, increasing internal resistance and heat generation. Full-tab technology, by turning the entire current collector into a tab, allows current to be directly transmitted through the current collector, thereby significantly shortening the conduction path, reducing internal resistance, and improving charge / discharge efficiency and battery life. The core can be assembled by winding the positive and negative electrode sheets and the separator. Generally, the core will also be pre-pressed and shaped. The positive and negative electrode sheets of the full-tab battery have positive and negative tabs respectively. The core is connected to the full-tab battery terminals through the positive and negative tabs. The full tabs of the core are not cut, forming a circumferential closed structure.

[0029] In some embodiments, during the winding of the core, the tab 120 is also wound, and the tab 120 can be wound into an approximately elliptical ring shape. The connecting hole 1201 is formed by winding the tab 120 and is an inner hole of an elliptical ring. Specifically, the connecting hole 1201 located in the middle of the tab 120 is approximately elliptical.

[0030] In some other embodiments, after the hot pressing process, the shape of the connecting hole 1201 of the tab 120 can also be approximately a linear slit.

[0031] In some other embodiments, the connection hole 1201 may also be formed on the tab 120 by means of digging, drilling or other methods.

[0032] In some embodiments, the inner pin 222 is inserted in the middle of the tab 120. For example, if the tab 120 has 96 layers, the inner pin 222 is located between the 48th and 49th layers.

[0033] In some embodiments, the battery cell 10 includes two tabs 120 with opposite polarities, a positive and a negative electrode, located at opposite ends of the main body 110. The top cover assembly 20 includes a cover 240 covering one end of the housing 30. The top cover assembly 20 also includes two electrodes 210 and two battery pins 220. The two electrodes 210 are the positive and negative electrodes, respectively, located at opposite ends of the cover 240. The two battery pins 220 are connected to opposite ends of the battery cell 10 and are connected to the two electrodes 210 one-to-one. Specifically, the positive electrode 210 is electrically connected to the positive tab 120 via one of the battery pins 220, and the negative electrode 210 is electrically connected to the negative tab 120 via the other battery pin. A current loop can be formed between the main body 110, the tabs 120, the battery pins 220, the electrodes 210, and an external electrical device or charging device.

[0034] Specifically, the electrode 210 can be a terminal post. One end of the electrode 210 passes through the cover 240 and is connected to the battery pin 220, while the other end is used to connect to an external electrical device or charging device.

[0035] In some embodiments, the outer pin 221 includes a first pin 2211 and a second pin 2212. One end of the first pin 2211 and one end of the second pin 2212 are both connected to the electrode 210. The first pin 2211 and the second pin 2212 are located on opposite sides of the inner pin 222. The outer surface of the tab 120 includes a first connecting surface 121 and a second connecting surface 122 that are opposite to each other. The inner surface of the connection hole 1201 includes a third connecting surface 123 and a fourth connecting surface 124 that are opposite to each other. The first pin 2211 is connected to the first connecting surface 121, the second pin 2212 is connected to the second connecting surface 122, and the two sides of the inner pin 222 are connected to the third connecting surface 123 and the fourth connecting surface 124, respectively. The opposite sides of the inner pin 222 can be fitted and connected to the third connecting surface 123 and the fourth connecting surface 124, respectively, to fully expand the contact area between the battery pin 220 and the tab 120 and improve the current carrying capacity of the battery pin 220.

[0036] In some other embodiments, there may be multiple inner pins 222, for example, there may be two inner pins 222, one of which is attached to the third connecting surface 123, and the other inner pin 222 is attached to the fourth connecting surface 124.

[0037] In some embodiments, the first pin 2211 and the second pin 2212 are led out from opposite ends of the electrode 210, and the inner pin 222 is led out from the middle of the electrode 210. The inner pin 222, the first pin 2211 and the second pin 2212 can be fixedly connected to the electrode 210 by welding or screwing, etc. The inner pin 222, the first pin 2211, the second pin 2212 and the electrode 210 can also be integrally injection molded.

[0038] In some embodiments, the first connecting surface 121, the second connecting surface 122, the third connecting surface 123, and the fourth connecting surface 124 are arranged in parallel intervals. The first connecting surface 121, the second connecting surface 122, the third connecting surface 123, and the fourth connecting surface 124 may be parallel to the length direction of the tab 120. The areas of the first connecting surface 121, the second connecting surface 122, the third connecting surface 123, and the fourth connecting surface 124 may be the same. The projection surfaces of the first connecting surface 121, the second connecting surface 122, the third connecting surface 123, and the fourth connecting surface 124 along the thickness direction of the tab 120 may completely overlap.

[0039] In some embodiments, the length direction of the battery pin 220 is parallel to the length direction of the tab 120, the first pin 2211 is attached to the first connecting surface 121, the second pin 2212 is attached to the second connecting surface 122, and the two sides of the inner pin 222 are attached to the third connecting surface 123 and the fourth connecting surface 124, respectively.

[0040] In some embodiments, the first pin 2211 is connected to the first connecting surface 121 by welding, the second pin 2212 is connected to the second connecting surface 122 by welding, and the two sides of the inner pin 222 are connected to the third connecting surface 123 and the fourth connecting surface 124 by welding, respectively. The welding method described above can be laser welding, ultrasonic welding, or resistance welding, etc., and is not limited here.

[0041] In some embodiments, the first pin 2211, the second pin 2212, and the inner pin 222 can be simultaneously connected to the tab 120 by ultrasonic welding. Ultrasonic welding utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the surfaces of the two objects rub against each other, forming a fusion between molecular layers. Because ultrasound has penetrating power, it can act simultaneously on the connection surfaces of the first pin 2211, the second pin 2212, the inner pin 222, and the tab 120 to achieve simultaneous welding.

[0042] In some other embodiments, the outer pin 221 may include only the first pin 2211 or only the second pin 2212, and the inner pin 222 may be connected only to the third connection surface 123 or the fourth connection surface 124.

[0043] In some embodiments, the inner pin 222 is provided with a clearance groove 2201, and the tab 120 is provided with a transition section 125 near the electrode 210. The transition section 125 is inserted into the clearance groove 2201. Specifically, in the width direction of the tab 120, the transition section 125 may be wholly or partially accommodated in the clearance groove 2201.

[0044] Specifically, the electrode 120 includes two opposing main body segments (not shown in the figure). The first connecting surface 121, the second connecting surface 122, the third connecting surface 123, and the fourth connecting surface 124 are the surfaces of the main body segments. The main body segments are line segments. The transition segment 125 is used for the transition connection between the two main body segments, that is, the transition segment 125 is the R-angle between the two main body segments. The transition segment 125 can be arc-shaped. The connecting hole 1201 is located on the side of the transition segment 125 away from the electrode 210. The inner pin 222 extending from the electrode 210 toward the connecting hole 1201 will be blocked by the transition segment 125. The inner pin 222 is provided with a relief groove 2201 to avoid the transition segment 125, so that the inner pin 222 can be inserted into the connecting hole 1201.

[0045] In some embodiments, the inner pin 222 can be generally rectangular in shape, and the clearance groove 2201 can be formed on the inner pin 222 by cutting direction, or the clearance groove 2201 can be formed directly during the injection molding of the inner pin 222. Directly forming the clearance groove 2201 on the inner pin 222 can prevent the inner pin 222 from protruding from the cover 240 in the width direction due to bending, and can avoid the transition section 125 without occupying additional internal space of the full-tab battery, while not increasing manufacturing costs.

[0046] In some other embodiments, the inner pin 222 can be bent to make it protrude at the transition section 125 to form a groove, thereby avoiding the transition section 125; or an "opening" process can be added to the transition section 125 later so that the inner pin 222 passes through the opening on the transition section 125.

[0047] In some other embodiments, the width of the inner pin 222 may be greater than the width of the outer pin 221, and the depth of the clearance groove 2201 may be greater than or equal to the width of the tab 120, so that the transition section 125 can be fully accommodated in the clearance groove 2201.

[0048] In some embodiments, the thickness of the transition section 125 is a second thickness a, and the length of the clearance groove 2201 is a third length b, wherein the third length b is greater than or equal to the second thickness a. The length of the clearance groove 2201 refers to the distance between the two side walls of the clearance groove 2201 disposed opposite each other in the length direction of the tab 120.

[0049] Specifically, the length of the clearance groove 2201 is greater than the thickness of the transition section 125, so that the transition section 125 can be inserted into the clearance groove 2201. In some other embodiments, the length of the clearance groove 2201 may also be equal to the thickness of the transition section 125, with the transition section 125 embedded in the clearance groove 2201, so that the transition section 125 and the inner wall of the clearance groove 2201 fit together, thereby increasing the contact area between the inner pin 222 and the tab 120.

[0050] In some embodiments, such as Figure 2 and Figure 5 As shown, the inner pin 222 includes a clearance section 2221 and a connecting section 2222. The clearance groove 2201 is formed in the clearance section 2221, and the connecting section 2222 is inserted into the connecting hole 1201. The clearance section 2221 extends from one end of the connecting section 2222 toward the electrode 210.

[0051] In some embodiments, such as Figure 2 , Figure 4 and Figure 6As shown, the outer pin 221 includes a bent portion 2213 and a connecting portion 2214 connected together. An isolation member 230 is provided between the battery cell 10 and the electrode 210. The isolation member 230 is used to separate the battery cell 10 and the electrode 210. The bent portion 2213 is connected to the electrode 210. One side of the connecting portion 2214 is connected to the outer surface of the tab 120. A clearance space 22101 is formed between the bent portion 2213 and the electrode 210. The isolation member 230 is at least partially located within the clearance space 22101.

[0052] Specifically, the projections of the connecting portion 2214 and the spacer 230 onto a plane perpendicular to the length direction of the tab 120 at least partially overlap. The bent portion 2213 is connected to one end of the connecting portion 2214 and bends away from the tab 120 to form a clearance space 22101 to avoid the spacer 230.

[0053] Specifically, the separator 230 is made of insulating material to prevent current leakage between the cell 10 and the electrode 210, ensuring that the current flows along a specific path, thereby guaranteeing the safe operation of the all-tab battery. The separator 230 can be made of plastic or rubber, such as polyvinyl chloride, PVC, or neoprene rubber.

[0054] In some embodiments, the connecting portion 2214 and the connecting segment 2222 are arranged in parallel and spaced apart. The connecting portion 2214 of the first pin 2211 is attached to the first connecting surface 121, the connecting portion 2214 of the second pin 2212 is attached to the second connecting surface 122, and the two sides of the connecting segment 2222 are attached to the third connecting surface 123 and the fourth connecting surface 124, respectively.

[0055] In some embodiments, the outer pin 221 does not protrude from the tab 120 in the width direction to increase the contact area with the tab 120. The inner pin 222 protrudes slightly from the tab 120 in the width direction to bypass the transition section 125 and connect to the electrode 210.

[0056] In some embodiments, such as Figure 3 As shown, the outer surface of the tab 120 and the inner surface of the connection hole 1201 are both provided with a connection area 126. The connection area 126 is used to fit and connect with the battery pin 220. The length of the connection area 126 is greater than or equal to three-quarters of the length of the tab 120, and the width of the connection area 126 is greater than or equal to three-quarters of the width of the tab 120.

[0057] Specifically, the areas of the connection areas 126 of the first connection surface 121, the second connection surface 122, the third connection surface 123, and the fourth connection surface 124 can be the same. Each connection area 126 has a length of a first length x and a width of a first width y. The length of the tab 120 is a second length e, and the width is a second width f. The first length x is greater than or equal to three-quarters of the second length e, and the first width y is greater than or equal to three-quarters of the second width f, so that the inner pin 222, the first pin 2211, the second pin 2212, and the tab 120 have a large contact area, ensuring that the battery pin 220 has good current-carrying capacity.

[0058] In some embodiments, the size of the battery pin 220 is designed according to the matching tab 120. The width of the connection portion 2214 can be equal to the width of the connection area 126, so as to increase the area of ​​the connection area 126 while reducing the internal space of the full tab battery occupied by the connection portion 2214. The width of the connection segment 2222 can be slightly larger than the width of the connection area 126, so that the inner pin 222 can avoid the transition segment 125 from connecting with the electrode 210.

[0059] In some embodiments, the thickness of the inner pin 222, the first pin 2211, and the second pin 2212 is a first thickness z, which ranges from 0.2 mm to 0.5 mm, to ensure that the battery pin 220 has sufficient strength and good current carrying capacity. Specifically, the first thickness z can be 0.2 mm, 0.25 mm, 0.34 mm, 0.4 mm, 0.5 mm, or any value between the above thicknesses.

[0060] In some embodiments, the first thickness z of a small allotab battery ranges from 0.2 mm to 0.3 mm; the first thickness z of a medium allotab battery is from 0.3 mm to 0.4 mm; and the first thickness z of a large allotab battery is from 0.4 mm to 0.5 mm.

[0061] In some embodiments, the lengths of the first pin 2211, the second pin 2212, and the inner pin 222 may also be different. For example, the length of the inner pin 222 may be less than the lengths of the first pin 2211 and the second pin 2212. The inner pin 222 may extend from the electrode 210 beyond the transition section 125 and be inserted into the connection hole 1201. The contact area between the battery pin 220 and the tab 120 is increased by the contact between the inner pin 222 and the outer peripheral surface of the transition section 125.

[0062] In some embodiments, the end of the first pin 2211 away from the electrode 210 and the end of the second pin 2212 away from the electrode 210 can be connected to improve the stability of the battery pin 220. Specifically, the end of the first pin 2211 away from the electrode 210 and the end of the second pin 2212 away from the electrode 210 can be connected by a connector, with the inner pin 222 located between the connector and the electrode 210. During the installation and connection of the top cover assembly 20 with the battery cell 10, the inner pin 222 needs to be bent in a direction away from the electrode 120 to insert into the connection hole 1201 of the tab 120, generating elastic deformation to avoid the tab 120, allowing the tab 120 to be inserted between the first pin 2211 and the second pin 2212. Then, when the inner pin 222 recovers its deformation, the connecting section 2222 of the inner pin 222 can be inserted into the tab 120. The inner pin 222 is located between the connector and the electrode 210, which facilitates the bending of the inner pin 222 and ensures that the bending process of the inner pin 222 is not obstructed by the connector.

[0063] In some embodiments, the length of the inner pin 222 may be less than the length of the first pin 2211 and the second pin 2212, so that the inner pin 222 can be disposed between the connector and the electrode 210.

[0064] In some other embodiments, the first pin 2211, the second pin 2212, the electrode 210, and the connector can be arranged to form a through hole, and the tab 120 can be inserted into and fixed in the through hole.

[0065] In some embodiments, the thicknesses of the first pin 2211, the second pin 2212, and the inner pin 222 may also be different. The thickness of the inner pin 222 can be adjusted according to the thickness of the connecting hole 1201. For example, the thickness of the inner pin 222 can be equal to the thickness of the connecting hole 1201. The thickness of the connecting hole 1201 refers to the distance between the third connecting surface 123 and the fourth connecting surface 124, so that the inner pin 222 can simultaneously fit with both the third connecting surface 123 and the fourth connecting surface 124.

[0066] In some embodiments, such as Figure 2 and Figure 4 As shown, the bending portion 2213 includes a first segment 22131 and a second segment 22132. The first segment 22131 is connected to the electrode 210 and is parallel to the connecting portion 2214. In the thickness direction of the tab 120, the first segment 22131 is further away from the tab 120 than the connecting portion 2214 to avoid the separator 230. The second segment 22132 is inclined and is connected between the first segment 22131 and the connecting portion 2214.

[0067] In some embodiments, the first pin 2211 and the second pin 2212 are symmetrically distributed on both sides of the inner pin 222, and the bent portion 2213 of the first pin 2211 and the bent portion 2213 of the second pin 2212 roughly form an "eight" shape.

[0068] In some embodiments, the housing 30 and the cover 240 form an inner cavity, in which the battery cell 10 is installed. Specifically, the top cover assembly 20 can be formed into a full-tab battery by sealing welding with the housing 30.

[0069] In some embodiments, such as Figure 1 As shown, the all-tab battery also includes an explosion-proof valve 250, which is located on the side of the cover 240 opposite to the cell 10. The main function of the explosion-proof valve 250 is to automatically open to release pressure and heat when the internal pressure or temperature of the all-tab battery exceeds a safety threshold, thereby preventing the all-tab battery from exploding or catching fire.

[0070] Specifically, the explosion-proof valve 250 includes a positive temperature coefficient thermistor. The thermistor's resistance increases as the temperature rises, achieving a non-conductive state and triggering the opening of the explosion-proof valve 250. This design ensures that when the temperature of the all-tab battery rises, causing internal gas expansion and pressure to reach a critical point, the explosion-proof valve 250 can respond promptly, protecting the all-tab battery by releasing gas and pressure.

[0071] In some embodiments, the all-tab battery further includes an electrolyte injection hole 260, which is disposed on the cover 240 and serves to provide a flow channel for the electrolyte. Simultaneously, the all-tab battery generates gas during operation. If there is no suitable venting channel, the gas will accumulate inside the all-tab battery, leading to damage. The electrolyte injection hole 260 can release the gas, thus protecting the all-tab battery.

[0072] In some embodiments, the omni-tab battery is a lithium-ion battery, which is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to store and release electrical energy.

[0073] In some embodiments, the all-tab battery is a square aluminum-cased all-tab battery, which is a type of lithium-ion battery. Its casing is made of aluminum, providing high mechanical strength and good heat dissipation. In other embodiments, the all-tab battery may also be a steel-cased all-tab battery.

[0074] Using the all-tab battery structure in the embodiments of this application as the experimental group and the conventional all-tab battery structure as the benchmark group, two types of 20Ah lithium-ion square aluminum-cased all-tab batteries were prepared and their discharge rate and temperature rise were tested.

[0075] The testing method is as follows:

[0076] Test temperature: 25℃±2℃;

[0077] 1) 0.2C, CC-2.5V, let stand for 10 minutes;

[0078] 2) 0.2C, CCCV-4.2V, cutoff current 0.02C, rest for 10 minutes;

[0079] 3) Record the 0.2C discharge capacity at CC-2.5V and let it stand for 10 minutes;

[0080] 4) 0.2C, CCCV-4.2V, cutoff current 0.02C, rest for 10 minutes;

[0081] 5) DC, CC-2.5V, record the DC discharge capacity, let stand for 30 minutes; (record the temperature rise)

[0082] 6) Repeat steps 4)-5) to perform discharge at different rates, with discharge rates D being 0.5 / 1 / 2 / 3 / 5C respectively. Calculate the ratio of the discharge capacity at each rate to that at 0.2C.

[0083] Wherein, 0.2C represents 0.2 times the rated capacity current of the all-tab battery, CC-2.5V represents a discharge voltage of 2.5V, and CCCV-4.2V represents a charging voltage of 4.2V.

[0084] The test results are shown in the table below:

[0085]

[0086] The test results above and Figure 7 As shown, the experimental group exhibits higher discharge capacity retention and lower discharge temperature rise at all rates compared to the benchmark group. This demonstrates that the all-tab battery design using the all-tab battery structure described in this application can significantly improve rate discharge performance and power performance.

[0087] The all-tab battery provided in this application has a three-segment structure for its battery pins 220, comprising a first pin 2211, an inner pin 222, and a second pin 2212. The outer pin 221 connects to the outer surface of the tab 120, and the inner pin 222 connects to the inner surface of the tab 120. This forms four connection surfaces between the battery pins 220 and the tab 120, significantly increasing the contact area and enhancing current carrying capacity. The inner pin 222 has a clearance groove 2201 to avoid the transition section 125 of the tab 120, fully utilizing the internal space of the all-tab battery. The length and width dimensions of the battery pins 220 are designed according to the tab 120 to be matched, maximizing the current carrying capacity of the tab 120 and greatly reducing temperature rise. The all-tab battery structure of this application is simple, fully utilizing the structural characteristics of the tab 120 and the internal space of the all-tab battery, resulting in better power performance.

[0088] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A multi-tab battery, characterized in that, include: A battery cell, the battery cell comprising a main body and a tab connected to each other, the main body being used to supply power through the tab, the tab being provided with a connection hole; The housing contains the battery cell. A top cover assembly is connected to one end of the housing. The top cover assembly includes an electrode and a battery pin. The battery pin includes at least one outer pin and at least one inner pin. One end of the outer pin and one end of the inner pin are both connected to the electrode. The side of the outer pin near the tab is connected to the outer surface of the tab. The inner pin is connected to the inner surface of the connection hole.

2. The omni-tab battery according to claim 1, characterized in that, The outer pins include a first pin and a second pin. One end of the first pin and one end of the second pin are both connected to the electrode. The first pin and the second pin are located on opposite sides of the inner pin. The outer surface of the tab includes a first connecting surface and a second connecting surface that are opposite to each other. The inner surface of the connecting hole includes a third connecting surface and a fourth connecting surface that are opposite to each other. The first pin is connected to the first connecting surface, the second pin is connected to the second connecting surface, and both sides of the inner pin are connected to the third connecting surface and the fourth connecting surface, respectively.

3. The omni-tab battery according to claim 1, characterized in that, The inner pin is provided with a clearance groove, and the tab is provided with a transition section at one end near the electrode, the transition section being inserted into the clearance groove.

4. The omni-tab battery according to claim 3, characterized in that, The length of the clearance groove is greater than or equal to the thickness of the transition section.

5. The omni-tab battery according to claim 1, characterized in that, Both the outer surface of the tab and the inner surface of the connection hole are provided with a connection area. The connection area is used to fit and connect with the battery pin. The length of the connection area is greater than or equal to three-quarters of the length of the tab, and the width of the connection area is greater than or equal to three-quarters of the width of the tab.

6. The omni-tab battery according to claim 1, characterized in that, The thickness of both the inner and outer pins ranges from 0.2 mm to 0.5 mm.

7. The omni-tab battery according to claim 1, characterized in that, The outer pin includes a bent portion and a connecting portion connected together. An isolation member is provided between the battery cell and the electrode. The isolation member is used to separate the battery cell and the electrode. The bent portion is connected to the electrode. One side of the connecting portion is connected to the outer surface of the tab. The bent portion and the electrode form a clearance space. The isolation member is at least partially located within the clearance space.

8. The omni-tab battery according to claim 7, characterized in that, The bending portion includes a first segment and a second segment. The first segment is parallel to the connecting portion, and the second segment is connected between the first segment and the connecting portion. The first segment is further away from the tab than the connecting portion to avoid the isolator.

9. The omni-tab battery according to claim 1, characterized in that, The top cover assembly includes a cover body that covers one end of the housing. The top cover assembly also includes two electrode components and two battery pins. The two electrode components are positive and negative electrodes, respectively, and are located at both ends of the cover body. The two battery pins are respectively connected to both ends of the battery cell and are connected to the two electrode components one-to-one.

10. The omni-tab battery according to claim 2, characterized in that, A connector is connected between the end of the first pin away from the electrode and the end of the second pin away from the electrode, and the inner pin is located between the connector and the electrode.

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