A type of all-pole battery

Abstract

A multi-tab battery, belonging to the field of power battery technology, is disclosed. The multi-tab battery includes: a battery casing, with battery cells disposed within the casing and connected to each other via connecting tabs; terminals are also disposed on the battery casing, with a slide rail assembly located within the casing; the terminals and the battery casing are sealed and snap-fitted together, and the slide rail assembly and the connecting tabs are slidably snap-fitted together. This invention employs a slide rail design, and the connecting tabs and terminals are snap-fitted together, eliminating the need for welding connections. This reduces the number of welding steps in the power battery manufacturing process. The structural improvement of this invention solves the problems of high production energy consumption and high welding failure rate in traditional technologies where batteries involve multiple welding processes.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and more specifically, to a multi-tab battery. Background Technology

[0002] Currently, the manufacturing process of square batteries mainly includes slurry mixing, coating, rolling, sheet making, cell making, assembly, electrolyte injection, formation, and capacity testing. In the sheet making process, the tabs of the positive and negative electrodes need to be laser-cut or die-cut according to the designed dimensions. Cell making involves two methods: winding and stacking. In the assembly process, the tabs of the positive electrode are first welded to aluminum connecting pieces, and the tabs of the negative electrode are welded to copper connecting pieces. Then, the connecting pieces are welded to the terminals on the top cover, and finally, the top cover is welded to the battery casing. This assembly process includes at least three welding operations. This multi-step welding method complicates the cell manufacturing process, increases production energy consumption, and significantly increases the probability of welding failure. Failed welding batteries are irreparable, further increasing battery production costs.

[0003] Chinese patent CN 110518174 A discloses a battery, battery module, battery pack, and electric vehicle. The patent's technical solution involves using multiple electrode core components connected in series to form an electrode core group, with a separator between at least two adjacent electrode core components. While this patent improves upon the design by combining multiple individual cells into a single battery, reducing structural redundancy and increasing energy density, the use of tabs at both ends along the battery's length results in an excessively long charging path. This leads to excessively high charging and discharging currents, potentially causing localized overheating and, in severe cases, spontaneous combustion. Furthermore, the patent does not provide any technical guidance on reducing welding steps.

[0004] Chinese patent CN 114512747 A discloses a full-tab battery. The patent's technical solution involves retaining tabs on both sides of each cell and extending two pins downwards from both ends of the top cover, welding the tabs to the pins. While this patent retains full tabs, the current is concentrated entirely at the pins during charging and discharging, without current shunting. Furthermore, the cells closest to the top cover experience the highest current, still posing a risk of thermal runaway. Additionally, the battery size is limited in this patent: when the cell extends longitudinally (in the pin direction), it's difficult to maintain consistency in the welding of the pins and tabs, and the thermal effects during charging and discharging are more pronounced; when extended laterally, the welding distance to the top cover is relatively long, increasing the risk of welding failure and raising production costs. The added pin design also increases the weight of the battery cell, inevitably reducing its energy density. This patent also employs multiple welding steps, still exhibiting problems such as complex cell manufacturing processes, high production energy consumption, and a high rate of welding failures.

[0005] In summary, how to provide a novel battery structure to solve the problems of high production energy consumption and high battery welding failure rate caused by the multiple welding processes in traditional batteries has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

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

[0007] This invention provides a multi-tab battery, which includes a battery casing, a battery cell disposed inside the battery casing, and the battery cells being connected by connecting pieces; a terminal post is also disposed on the battery casing, and a slide rail assembly is disposed on the portion of the terminal post located inside the battery casing; the terminal post and the battery casing are sealed and snap-fitted together, and the slide rail assembly and the connecting pieces are slidably snap-fitted together.

[0008] Preferably, in the all-tab battery provided by the present invention, the slide rail assembly includes two parallel slide rails, the slide rails are spaced apart and form sliding slots, and the connecting piece is slidably engaged in the sliding slots.

[0009] Preferably, in the all-tab battery provided by the present invention, the slide rail is a long rectangular slide rail structure; or, the slide rail is a long inverted triangular slide rail structure; or, the slide rail is a long arc plate structure.

[0010] Preferably, in the all-tab battery provided by the present invention, multiple slide rail assemblies are provided, all of which are arranged in parallel and along a direction perpendicular to the length of the slide rail.

[0011] Preferably, in the all-tab battery provided by the present invention, the slide rail includes slide rail units, and the slide rail units constituting the same slide rail are arranged in a straight line and spaced apart.

[0012] Preferably, in the all-tab battery provided by the present invention, the battery casing includes a long side, a wide side, and a high side. The side formed by the long side and the high side is the long side side, the side formed by the long side and the wide side is the wide side side, and the side formed by the wide side and the high side is the high side side. The slide rail assembly is disposed on the wide side side, and the length direction of the slide rail is parallel to the long side.

[0013] Preferably, in the all-tab battery provided by the present invention, an auxiliary structure is provided on the high side surface; the auxiliary structure includes an explosion-proof valve and / or a liquid injection hole.

[0014] Preferably, in the all-tab battery provided by the present invention, a sealing component is provided at the connection between the terminal post and the battery casing.

[0015] Preferably, in the all-tab battery provided by the present invention, the terminal post is mounted on the battery housing, and the terminal post includes a first terminal post located outside the battery housing, a second terminal post located inside the battery housing, and an intermediate terminal post for connecting the first terminal post and the second terminal post; the first terminal post, the intermediate terminal post, and the second terminal post are sequentially connected to form the terminal post with an I-shaped integrated structure.

[0016] Preferably, in the all-tab battery provided by the present invention, the positive electrode connecting piece is an aluminum connecting piece or an aluminum alloy connecting piece, and the negative electrode connecting piece is a copper connecting piece or a copper alloy connecting piece; the positive electrode material of the battery cell is lithium iron phosphate, lithium manganese iron phosphate, ternary material, lithium cobalt phosphate, or sodium-based positive electrode material, and the negative electrode material of the battery cell is graphite-based, silicon-based or siloxy-based, lithium metal, or a graphite-silicon-oxygen mixture; the positive electrode foil of the battery cell is aluminum foil or carbon-coated aluminum foil, and the negative electrode foil of the battery cell is copper foil or copper-plastic composite current collector; the battery casing is an aluminum casing, a stainless steel casing, or a plastic casing.

[0017] The beneficial effects of this invention are as follows:

[0018] As can be seen from the above, the present invention provides a full-tab battery, which includes a battery housing, a battery cell disposed inside the battery housing, and the battery cells are connected to each other by a connecting piece; a terminal post is also disposed on the battery housing, and a slide rail assembly is disposed on the portion of the terminal post located inside the battery housing; the terminal post and the battery housing are sealed and snap-fitted together, and the slide rail assembly and the connecting piece are slidably snap-fitted together.

[0019] In the above structural design, after the cell is welded with a connecting piece, the connecting piece (together with the cell) is assembled into the battery casing through the slide rail of the terminal post. The cell is connected to the terminal post through the connecting piece. The connecting piece and the terminal post are in a sliding snap-fit ​​fit, and no further welding connection is made between the connecting piece and the terminal post.

[0020] Through the above structural design, this invention employs a sliding rail design, eliminating the need for laser cutting or die-cutting of the cell's tabs and the need to design welding lengths. This shortens the tab height, increases the material area width, and consequently increases the energy density of the single cell. The full tab design disperses the current on the current collector, avoiding safety hazards caused by localized overheating of the current collector; it significantly increases the current conduction area and shortens the current conduction distance, thereby reducing the battery's internal resistance; and it reduces the current density per unit area of ​​the cell, thus improving the battery's fast-charging performance and long-cycle performance. Most importantly, this invention uses a snap-fit ​​method to connect the connecting piece and the terminal post, eliminating the need for welding connections. This reduces the number of welding steps in the power battery manufacturing process. The structural improvements of this invention solve the problems of high production energy consumption and high battery welding failure rates caused by multiple welding processes in traditional technologies. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0022] Figure 1 This is a simplified structural diagram of the all-tab battery in an embodiment of the present invention from the main viewing angle;

[0023] Figure 2 This is a simplified structural diagram of the all-tab battery in an embodiment of the present invention from a side view.

[0024] exist Figure 1 and Figure 2 In the diagram, the correspondence between component names and reference numerals is as follows:

[0025] Battery casing 1, battery cell 2, positive electrode 3, negative electrode 4, positive electrode connecting piece 5, negative electrode connecting piece 6, terminal post 7, slide rail assembly 8, injection molding sealing structure 9, explosion-proof valve 10, liquid injection hole 11. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0027] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0028] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a simplified structural diagram of the all-tab battery in an embodiment of the present invention from the main viewing angle; Figure 2 This is a simplified structural diagram of the all-tab battery in an embodiment of the present invention from a side view.

[0029] This invention provides a multi-tab battery, which comprises the following structure:

[0030] 1. Battery casing 1.

[0031] The battery casing 1 is the outermost structure of the all-tab battery. The battery casing 1 is used to install other structures that constitute the present invention. At the same time, the battery casing 1 also plays a role in sealing and protecting the battery cell 2.

[0032] In this invention, the battery casing 1 can be made of metal materials, such as steel or steel alloys, aluminum or aluminum alloys, or it can be made of plastic materials. When metal materials are used, metal sheets are stamped and formed; when plastic materials are used, the battery casing 1 is integrally formed using injection molding.

[0033] In this invention, the battery casing 1 is preferably a rectangular casing structure, which includes a long side, a wide side, and a high side. For ease of structural description, the following are defined: the side enclosed by the long side and the high side is the long side side (the length of the long side side is the long side of the battery casing 1, and the width of the long side side is the high side of the battery casing 1); the side enclosed by the long side and the wide side is the wide side side (the length of the wide side side is the long side of the battery casing 1, and the width of the wide side side is the wide side of the battery casing 1); and the side enclosed by the wide side and the high side is the high side side (the length of the high side side is either the wide side or the high side of the battery casing 1, and the width of the high side side is either the high side or the wide side of the battery casing 1). There are two long side sides, which are opposite to each other and parallel to each other; there are two wide side sides, which are opposite to each other and parallel to each other; and there are two high side sides, which are opposite to each other and parallel to each other.

[0034] The present invention provides a battery housing 1 with a terminal post 7, an explosion-proof valve 10 and a liquid injection hole 11, and a battery cell 2 and a connecting piece inside the battery housing 1.

[0035] 2. The battery cell 2 is located inside the battery housing 1.

[0036] Cell 2 is the most basic power generation unit of a power battery. A power battery will have multiple cells 2 (at least one), and the structure of cells 2 is basically the same. When there are multiple cells 2 (more than one), the positive electrode 3 of cells 2 will be connected by connecting pieces, and the negative electrode 4 of the motor will be connected by connecting pieces.

[0037] For cell 2, it is assembled from positive electrode material and negative electrode material. A positive electrode foil is drawn out from the positive electrode material and then connected to the positive electrode plate 3 through the positive electrode foil. A negative electrode foil is drawn out from the negative electrode material and then connected to the negative electrode plate 4 through the negative electrode foil, thus forming a complete cell structure. Multiple cells 2 are then assembled by winding or stacking.

[0038] Specifically, the positive electrode material of cell 2 is lithium iron phosphate, lithium manganese iron phosphate, ternary material, lithium cobalt phosphate, or sodium-based positive electrode material; the negative electrode material of cell 2 is graphite, silicon-based or silicon-oxygen, lithium metal, or graphite-silicon-oxygen mixture; the positive electrode foil of cell 2 is aluminum foil or carbon-coated aluminum foil; the negative electrode foil of cell 2 is copper foil or copper-plastic composite current collector.

[0039] For lithium-ion power batteries, the commonly used positive electrode current collector (positive electrode foil) is aluminum foil, and the negative electrode current collector (negative electrode foil) is copper foil. Furthermore, to ensure the stability of the current collector inside the battery, both require a purity of over 98%. In this invention, aluminum foil and copper foil are used as electrode conductive materials, which are lower in cost and have a softer texture, better meeting the requirements of battery rolling operations.

[0040] 3. Connecting piece.

[0041] The connecting pieces are divided into positive electrode connecting pieces 5, which are used to connect the positive electrode plates 3 between the cells 2, and negative electrode connecting pieces 6, which are used to connect the negative electrode plates 4 between the cells 2. Among them, the positive electrode connecting piece 5 is an aluminum connecting piece or an aluminum alloy connecting piece, and the negative electrode connecting piece 6 is a copper connecting piece or a copper alloy connecting piece.

[0042] 4. The terminal post 7 is installed on the battery housing 1.

[0043] Terminal 7 is the final structure of the power battery used for current output. External electrical devices are connected to terminal 7 of the power battery through a conductive system. As an integral structural component, part of terminal 7 is located on the outside of the battery housing 1 for connection with the external conductive system, while the other part is located inside the battery housing 1 for connection with the connecting piece.

[0044] In existing technologies, the welding operations involved in the terminal post 7 are numerous, specifically including welding between the terminal post 7 and the connecting piece, and welding between the terminal post 7 and the battery casing 1. This increased number of welding operations reduces the reliability and yield of the battery, specifically because problems are more likely to occur at the welded areas, and welding errors during manufacturing can easily lead to the scrapping of the entire battery. To address these issues, the number of welding operations should be minimized during the manufacturing process of the power battery. Therefore, this invention designs the terminal post 7 structure as follows: a slide rail assembly 8 is provided on the side of the terminal post 7 facing the inside of the battery casing 1 (i.e., the side where the terminal post 7 is located inside the battery casing 1). The slide rail assembly 8 is slidably engaged with the positive connecting piece 5 or the negative connecting piece 6.

[0045] In one embodiment of the present invention, the terminal post 7 is mounted on the battery housing 1. The terminal post 7 includes a first terminal post located outside the battery housing 1, a second terminal post located inside the battery housing 1, and an intermediate terminal post for connecting the first terminal post and the second terminal post. The first terminal post, the intermediate terminal post, and the second terminal post are connected in sequence to form an I-shaped integrated terminal post structure.

[0046] The terminal post 7 is mounted on the battery housing 1 and can be fixedly connected to the battery housing 1 by a snap-fit ​​structure. Specifically, the terminal post 7 includes a first terminal post (the upper part of the terminal post 7), a second terminal post (the lower part of the terminal post 7), and an intermediate terminal post (the middle part of the terminal post 7). The terminal post 7 is integrally formed of metal material (preferably aluminum or aluminum alloy). The first terminal post and the second terminal post are respectively located on the upper and lower sides of the intermediate terminal post and form an "I"-shaped structure of the terminal post 7. Specifically, the terminal post 7 is a long strip structure, and the cross-sectional shape of the terminal post 7 in the cross-section perpendicular to the length direction of the terminal post 7 is close to an "I".

[0047] The terminal post 7 has length, width, and height (i.e., thickness). The first and second terminal posts are located on the upper and lower sides of the middle terminal post. The height (thickness) of the first terminal post is greater than that of the second terminal post. The width of the first terminal post is basically the same as that of the second terminal post, but the width of the middle terminal post is smaller than the widths of the first and second terminal posts. This creates a slot structure between the first and second terminal posts. Additionally, the battery housing 1 has an installation window for mounting the terminal post 7 (the shape and size of the installation window are designed according to the slot structure on the terminal post 7, ensuring that the terminal post 7 can be stably and securely mounted on the battery housing 1). The edge of the installation window is sealed (by injection molding) within the slot structure. Specifically, the connection between the terminal post 7 and the battery housing 1 is provided with an injection-molded sealing structure 9. The injection-molded sealing structure 9 can improve the sealing performance of the connection between the terminal post 7 and the battery housing 1 (preventing battery fluid leakage) and effectively improve the firmness and reliability of the connection between the terminal post 7 and the battery housing 1.

[0048] The present invention provides a slide rail assembly 8 on the bottom surface of the pole post 7. The slide rail assembly 8 consists of two slide rails, and the slide rails can have the following three structures: the slide rail is a long rectangular slide rail structure; the slide rail is a long inverted triangular slide rail structure; the slide rail is a long arc plate structure.

[0049] The electrode post 7 is connected to the connecting piece. Specifically, the slide rail assembly 8 includes two parallel slide rails, which are spaced apart and form sliding grooves. The outlines of the positive electrode connecting piece 5 and the negative electrode connecting piece 6 match the shape of the sliding grooves. The slide rail assembly 8 is a component that has a connecting function (for connecting the electrode post 7 and the connecting piece) and a conductive function (for conducting the electrical energy of each battery cell 2 to the electrode post 7). Therefore, the slide rail assembly 8 is made of a metal material with good conductivity. In this invention, the slide rail assembly 8 is provided with two slide rails, and the connecting piece can be slidably engaged into the slide rail assembly 8.

[0050] In one specific embodiment of the present invention, the slide rail structure is as follows: the slide rail is a cuboid structure, the slide rail is long and strip-shaped with a rectangular cross-section, and the slide rail is welded to the bottom surface of the pole post 7, or the slide rail is integrally formed on the bottom surface of the pole post 7.

[0051] In another specific embodiment of the present invention, the slide rail structure is as follows: the slide rail is a long strip curved surface structure (a rectangular plate is smoothly bent in its width direction, that is, when viewed in the cross-section perpendicular to the length direction of the slide rail, the cross-sectional shape of the slide rail is a smooth curved surface), a connecting flange is provided on one long side of the curved surface of the slide rail, the connecting flange is used to fix and connect with the pole post 7, the two slide rails are mirror symmetrically arranged, and the other long sides of the curved surfaces of the two slide rails are opposite to each other and spaced apart.

[0052] In the third specific embodiment of the present invention, the slide rail structure is as follows: the slide rail is a long strip structure with a triangular cross-section (preferably an equilateral triangle). One side of the slide rail (the slide rail has three sides and two end faces) is connected to the bottom surface of the pole post 7, so that the sliding groove formed by the slide rail assembly 8 is a trapezoidal long straight groove structure.

[0053] It should be noted that although this invention only provides the above three slide rail structures, the slide rail structure is not limited to the above three structural forms.

[0054] Based on the second structural form of the slide rail (elongated curved surface structure), this invention also provides a slide rail assembly groove on the bottom surface of the pole post 7. The connecting flange is inserted into the slide rail assembly groove and fixedly connected to the side wall of the slide rail assembly groove. Simultaneously, this invention also provides a crossbeam penetrating the slide rail assembly groove on the battery housing 1. The crossbeam has a gap with the pole post 7 and the slide rail within the slide rail assembly groove. A crossbeam sealing structure is provided on the crossbeam, and the crossbeam sealing structure makes sealing contact with the connecting flange and the pole post 7 within the slide rail assembly groove.

[0055] Regarding the slide rail, the present invention also proposes the following structural optimizations: 1. Multiple slide rail assemblies 8 are provided, all slide rail assemblies 8 are arranged in parallel, and all slide rail assemblies 8 are arranged in a direction perpendicular to the length of the slide rail. This structure is suitable for structures with multiple pole posts 7 on the battery; 2. The slide rail includes slide rail units, and the slide rail units constituting the same slide rail are arranged in a straight line and spaced apart. The slide rail adopts a segment structure, and there are gaps between the slide rails, which can reduce the material used in the slide rail. At the same time, the existence of gaps can also achieve the dispersion of large current, reduce the current of each slide rail unit, and prevent the occurrence of overheating problems.

[0056] Specifically, the present invention has an auxiliary structure on the high side, wherein the auxiliary structure includes an explosion-proof valve 10 and / or a liquid injection hole 11.

[0057] This invention provides a multi-tab battery, comprising: a battery housing 1; a battery cell 2 disposed inside the battery housing 1, the battery cell 2 including a positive electrode 3 and a negative electrode 4; a positive electrode connecting piece 5 for connecting the positive electrode 3 between the battery cells 2; a negative electrode connecting piece 6 for connecting the negative electrode 4 between the battery cells 2; and a terminal post 7 disposed on the battery housing 1, the side of the terminal post 7 facing the inside of the battery housing 1 having a slide rail assembly 8, the slide rail assembly 8 being slidably engaged with the positive electrode connecting piece 5 or the negative electrode connecting piece 6.

[0058] The all-tab battery provided by this invention belongs to the category of power batteries and specifically relates to the field of battery manufacturing. This all-tab battery includes a battery casing 1, inside which are installed battery cells 2 and terminal posts 7 with sliding rails. A side cover plate (high side) is provided on the side of the battery casing 1, and the side cover plate has structures such as an explosion-proof valve 10 and a liquid injection hole 11. The sliding rail terminal posts 7 are distributed along the narrow side of the battery casing (the length of the terminal posts 7 is parallel to the length of the battery casing 1). The side cover plate is made of the same material as the battery casing 1 and has the liquid injection hole 11 and the explosion-proof valve 10 on it. After the battery cells 2 are welded with connecting pieces, the connecting pieces (along with the battery cells 2) are assembled into the battery casing 1 through the sliding rails of the terminal posts 7. There is no welding between the battery cells 2 and the terminal posts 7 (the battery cells 2 are connected to the terminal posts 7 through the connecting pieces, and the connecting pieces and terminal posts 7 are in a sliding snap-fit ​​engagement). In the above structural design, this invention incorporates a sliding rail-type terminal post 7. The terminal post 7 adopts an integrated structure and is assembled onto the top cover of the battery casing 1 via injection molding for sealing. This simplifies the top cover structure, allowing the battery casing 1 to be formed from sheet metal through stamping (integrated molding). This eliminates the need for welding between the top cover and the battery casing, reducing the cost of the top cover and minimizing losses due to poor welding. Furthermore, the sliding rail design of the terminal post 7 eliminates the need for laser cutting or die cutting of the tabs on the cell 2, eliminating the need for welding length design. This shortens the tab height, increases the material area width, and consequently increases the energy density of the individual battery cell. The all-tab design disperses the current on the current collector, avoiding safety hazards caused by local overheating of the current collector; it multiplies the current conduction area and shortens the current conduction distance, thereby reducing the internal resistance of the battery; it reduces the current density of cell 2 per unit area, thereby improving the battery's fast charging performance and long cycle performance.

[0059] Specifically, the pole 7 includes a positive pole and a negative pole, and the positive pole and the negative pole are made of the same material, size and structure.

[0060] A slide rail assembly 8 is provided on the pole post 7. The slide rail assembly 8 is a structure for the pole post 7 to slide into and be fixed. The slide rail assembly 8 is formed by casting, stamping or welding of an integrated mold.

[0061] In a specific embodiment of the present invention, the structural dimensions of the terminal post 7 are as follows: the straight-line distance between the two ends of the terminal post 7 and the end face of the battery casing 1 ranges from 1cm to 10cm; the distance between the two ends of the slide rail and the end face of the battery casing 1 ranges from 0.5cm to 5cm; and the length of the battery cell 2 tab is consistent with the length of the slide rail. The width between the two cuboids of the positive electrode slide rail is consistent with the thickness of the positive electrode connecting piece 5 and the positive electrode tab after welding; the width between the two cuboids of the negative electrode slide rail is consistent with the thickness of the negative electrode connecting piece 6 and the negative electrode tab after welding. The width ratio of the terminal post 7 to the width of the battery casing 1 is 1:1 to 1:5. The thickness of the battery casing 1 is 1-3mm. The thickness of the terminal post 7 is 2-6mm. The thickness of the connecting piece is 1-2mm. When the connecting piece is a cuboid, the width ratio of its positive and negative electrode connecting piece 6 to the width of its positive and negative electrode tab is 1:1 to 1:3.

[0062] The battery casing 1 has a certain length, width, and height, and can be a regular or irregular shape, such as a cuboid, cube, cylinder, or polygon. It should be noted that batteries of the above shapes can have protrusions, notches, or curvature.

[0063] Cell 2 retains all the tabs. Theoretically, the length L of the battery is not limited, the width of the battery should be less than 500mm, the thickness of the battery should be greater than 5mm, and the length of the battery should be greater than the width and the thickness of the battery.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] 1. In this invention, a pole post 7 with a sliding rail structure is designed, which does not use a complex top cover (the component structure of the battery housing 1, i.e. the wide side), and does not require welding between the top cover and the battery housing, thereby reducing the cost of the top cover and reducing losses caused by poor welding between the top cover and the battery.

[0066] 2. The sliding rail design eliminates the need for laser cutting or die cutting of the tabs of cell 2, and eliminates the need to design welding lengths. This allows for a shorter tab height and an increased material area, thereby increasing the energy density of the single cell.

[0067] 3. The all-tab design eliminates the need to cut the tabs of the positive and negative electrodes, thus eliminating burrs and the need for ceramic coating, improving safety and saving costs.

[0068] 4. The design of the multiple tabs disperses the current on the current collector, avoiding safety hazards caused by local overheating of the current collector; it multiplies the current conduction area and shortens the current conduction distance, thereby reducing the internal resistance of the battery; it reduces the current density of cell 2 per unit area, thereby improving the battery's fast charging performance and long cycle performance.

[0069] 5. It simplifies the battery manufacturing and assembly processes, shortens the manufacturing time of individual cells, and reduces losses caused by welding during production.

[0070] Based on the above structural design, the present invention also provides the following specific embodiments:

[0071] Example 1

[0072] Cell 2 consists of at least a positive electrode, a negative electrode, and a separator. The positive electrode material of the positive electrode 3 is lithium iron phosphate, accounting for 96.8% (σ1), and the areal density (ρ1) of the positive electrode is 400 g / m³. 2 Its actual specific capacity (C1) is 138 mAh / g; the negative electrode material is graphite. The material region length (L1) of the positive electrode is 3000 mm, and the material region width (W1) is 200 mm. The material region width of the negative electrode 4 is 204 mm, and the material region length is 3004 mm. Cell 2 is prepared by stacking, with 30 positive electrode sheets (n1) and 31 negative electrode sheets (n2). The formula for calculating the capacity of cell 2 is: C = ρ1L1W1σ1n1 / 1000000, which gives C = 961.8 Ah.

[0073] The battery casing 1 has a thickness of 2mm, a length of 3010mm, a width of 220mm, and a height of 30mm. The terminal post 7 has a length of 2900mm, a height of 4mm, and a width of 10mm.

[0074] In existing technologies, batteries using top covers have their positive and negative tabs pre-welded, then welded to connecting pieces, and finally the connecting pieces welded to the top cover. Therefore, the positive and negative tabs must have sufficient length depending on the thickness and capacity of the cell 2. When the battery capacity exceeds 50Ah, there must be at least a 5mm distance between the battery cell 2 with tabs on both sides and the top cover. For the full tab structure of this invention, the tabs of the electrode sheet are first welded to the connecting pieces, which then enter the battery via a slide rail. Therefore, for the same electrode sheet size, the tabs of the electrode sheet in this invention can be shorter than those of batteries with top covers. The height of the positive and negative tabs is 8mm, the width of the connecting piece is 6mm, and the thickness is 1mm. There is a 3mm gap between the positive connecting piece 5 and the positive tab, which is the unwelded area. The connecting piece protrudes 1mm from the top of the tab. After welding, the connecting piece needs to be flattened with a pressure roller, and insulating tape is applied to the unwelded areas. The slide rail is 3000mm long, the slide rail assembly 8 is 1mm high, and the slide rail assembly 8 is 6mm wide. The thickness of the positive electrode aluminum foil is 12μm, and the thickness of the negative electrode copper foil is 6μm. Therefore, the distance between the two slide rail assemblies 8 for the positive electrode is 1.36mm, and the distance between the two slide rail assemblies 8 for the negative electrode is 1.186mm. During the welding process between the connecting piece and the electrode tab, there will be a reduction in thickness. Therefore, when the cell 2 is assembled into the battery casing, the two slide rail assemblies 8 can be clamped to prevent the cell 2 from moving. After the cell 2 is inserted into the casing, the side cover (high side) is welded to the battery casing, thus completing the battery manufacturing process. The positive and negative electrode posts are distributed on opposite sides, and the explosion-proof valve 10 and the liquid injection hole 11 are located on the narrow side of the battery casing and are not on the same side as the electrode posts 7.

[0075] Example 2

[0076] Example 2 is exactly the same as Example 1, except that the tabs of the positive and negative electrodes are segmented, and the electrode post 7 is segmented. Each tab needs to be connected by welding. The distance between each electrode post 7 cannot be too large.

[0077] Comparative Example 1

[0078] The battery dimensions in this comparative example are the same as in Example 1, except that the sliding rail terminal 7 and the first housing are replaced with a top cover assembly. The explosion-proof valve 10 and the liquid injection hole 11 are placed on the top cover, eliminating the need for welding side covers. The top cover structure includes the terminal 7, sealing ring, stop bracket, explosion-proof valve 10, and liquid injection hole 11. Based on Example 1, the cell 2 has only an 8mm clearance between it and the upper and lower housings, so the housing thickness of the top cover assembly is at least 3mm. After welding the tabs to the connecting piece, it is then welded to the top cover terminal 7. The height of the positive tab is at least 20mm, the height of the negative tab is at least 20mm, and the width of the connecting piece is at least 15mm to meet the welding requirements. Since the unwelded areas of the positive and negative tabs occupy at least 5mm of clearance after welding, and the stop bracket occupies at least 2mm of clearance, the overall structure is designed to meet these requirements.

[0079] Compared to the comparative example and the embodiment, the width of the positive and negative electrodes in the comparative example is reduced by at least 1 mm. According to the capacity calculation formula C1 = ρLWσn / 1000000, for every 1 mm reduction in the width of the positive electrode, the battery capacity decreases by 4.8 Ah. The comparative example using a top cover structure has a capacity reduction of at least 4.8 Ah. Furthermore, the increased weight of the top cover and electrode tabs reduces the battery's energy density.

[0080] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-tab battery, characterized in that, Includes a battery housing, within which battery cells are disposed, and the battery cells are connected to each other via connecting pieces; A terminal post is also provided on the battery housing, and a slide rail assembly is provided on the part of the terminal post located inside the battery housing. The slide rail assembly is provided on the bottom surface of the terminal post. The terminal post and the battery housing are sealed and snap-fitted together, and the slide rail assembly and the connecting piece are slidably snap-fitted together. The slide rail assembly is a component that has a connecting function to realize the connection between the pole and the connecting piece, and also has a conductive function to conduct the electrical energy of each cell to the pole. The slide rail assembly includes two parallel slide rails, which are spaced apart and form sliding grooves, and the connecting piece is slidably engaged in the sliding grooves.

2. The omni-tab battery according to claim 1, characterized in that, The slide rail is a long, rectangular slide rail structure; Alternatively, the slide rail may be a long, inverted triangular slide rail structure; Alternatively, the slide rail may be a long, curved plate slide rail structure.

3. The omni-tab battery according to claim 1, characterized in that, Multiple slide rail assemblies are provided, all of which are arranged in parallel and along a direction perpendicular to the length of the slide rail.

4. The omni-tab battery according to claim 3, characterized in that, The slide rail includes slide rail units, and the slide rail units constituting the same slide rail are arranged in a straight line and spaced apart.

5. The omni-tab battery according to claim 1, characterized in that, The battery casing includes a long side, a wide side, and a high side. The side formed by the long side and the high side is the long side side, the side formed by the long side and the wide side is the wide side side, and the side formed by the wide side and the high side is the high side side. The slide rail assembly is disposed on the wide side, and the length direction of the slide rail is parallel to the long side.

6. The omni-tab battery according to claim 5, characterized in that, An auxiliary structure is provided on the high side surface; The auxiliary structure includes an explosion-proof valve and / or a liquid injection port.

7. The omni-tab battery according to claim 5, characterized in that, A sealing component is provided at the connection between the electrode post and the battery housing.

8. The omni-tab battery according to claim 1, characterized in that, The terminal post is mounted on the battery housing. The terminal post includes a first terminal post located outside the battery housing, a second terminal post located inside the battery housing, and an intermediate terminal post for connecting the first terminal post and the second terminal post. The first pole post, the intermediate pole post, and the second pole post are connected in sequence to form the pole post with an I-shaped integrated structure.

9. The omni-tab battery according to claim 1, characterized in that, The connecting piece is divided into a positive electrode connecting piece and a negative electrode connecting piece; The positive electrode connecting piece is an aluminum connecting piece or an aluminum alloy connecting piece, and the negative electrode connecting piece is a copper connecting piece or a copper alloy connecting piece; The positive electrode material of the battery cell is lithium iron phosphate, lithium manganese iron phosphate, ternary material, lithium cobalt phosphate or sodium-based positive electrode material, and the negative electrode material of the battery cell is graphite, silicon-based or silicon-oxygen, lithium metal, or graphite-silicon-oxygen mixture. The positive electrode foil of the battery cell is aluminum foil or carbon-coated aluminum foil, and the negative electrode foil of the battery cell is copper foil or copper-plastic composite current collector; The battery casing can be made of aluminum, stainless steel, or plastic.

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