A battery with two side tabs and an assembling method

Abstract

The application discloses a novel battery with two-side tab, which comprises a transversely distributed battery shell; a transversely distributed battery pole group is arranged in the battery shell; a negative tab and a positive tab are arranged on the left and right sides of the battery pole group respectively; the negative tab of the battery pole group is welded with a negative pole post on a negative cover plate through a negative connecting piece; the positive tab of the battery pole group is welded with a positive pole post on a positive cover plate through a positive connecting piece; an insulating support is arranged between the right side of the battery pole group and the positive cover plate; a through hole for allowing the positive tab to pass through is arranged on the insulating support; a negative cover plate insulating block is arranged on the side of the negative cover plate facing the battery pole group; and an insulating film is wrapped around the outer surface of the battery pole group. In addition, the application further discloses an assembling method of the novel battery with two-side tab. The application is scientific in design, can be assembled to obtain a safe and reliable rectangular battery with two-side tab, and guarantees the overall safety performance of the lithium ion battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a novel battery with tabs on both sides and an assembly method thereof. Background Technology

[0002] Lithium-ion batteries have advantages such as high specific energy, high cycle life, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools.

[0003] Currently, for existing lithium-ion prismatic batteries, the positive and negative terminals are typically located on the top battery cover. The positive and negative terminals are connected to one end of the positive and negative connecting pieces, respectively, while the other ends are connected to the positive and negative tabs of the battery electrode assembly. The assembly method for existing lithium-ion prismatic batteries is typically as follows: First, the positive and negative connecting pieces are welded to the positive and negative terminals on the battery cover, respectively. Then, the positive and negative tabs of the battery electrode assembly are welded to the corresponding positive and negative connecting pieces. Next, an insulating film is used to cover the battery electrode assembly and heat-fused to the cover support. Finally, the battery terminals are inserted into the casing, and the battery cover is welded to the battery casing to form the finished battery.

[0004] However, some customers currently require the production of rectangular batteries with tabs on both sides. The existing structural design and assembly method of lithium-ion rectangular batteries cannot meet the production and assembly requirements of rectangular batteries with tabs on both sides, do not meet the production conditions of rectangular batteries, and cannot provide safe and reliable rectangular batteries with tabs on both sides. Summary of the Invention

[0005] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a novel battery with tabs on both sides and an assembly method thereof.

[0006] Therefore, the present invention provides a novel battery with tabs on both sides, including a battery casing with horizontally distributed tabs and openings at both ends;

[0007] Inside the battery casing, there are horizontally distributed battery electrode groups;

[0008] Negative and positive tabs are respectively provided on the middle of the left and right sides of the battery electrode assembly;

[0009] The negative electrode tab of the battery electrode assembly is welded to the negative electrode post on the negative electrode cover plate via a negative electrode connecting piece;

[0010] The positive electrode tab of the battery electrode assembly is welded to the positive electrode post on the positive electrode cover plate via a positive electrode connecting piece;

[0011] An insulating bracket is provided between the right side of the battery electrode group and the positive electrode cover plate;

[0012] On the insulating bracket, a through hole is provided for the positive electrode tab of the battery electrode group to pass through;

[0013] At the upper and lower ends of the negative electrode cover plate on the side facing the battery electrode group, a negative electrode cover plate insulating block is provided respectively;

[0014] The two negative electrode cover plate insulating blocks are symmetrically arranged up and down;

[0015] The front, back, upper and lower outer surfaces of the battery electrode group are surrounded by a layer of insulating film;

[0016] The left side of the insulating film covers and is arranged on the outer surface of the negative electrode cover plate insulating block of the negative electrode cover plate;

[0017] The right side of the insulating film covers and is arranged on the front, back, upper and lower surfaces of the insulating bracket.

[0018] Preferably, the shape of the negative electrode cover plate insulating block is "凵" - shaped or "U" - shaped.

[0019] Preferably, at the front and back ends of the opposite sides of the two negative electrode cover plate insulating blocks, they are respectively connected by a vertically distributed negative electrode insulating strip.

[0020] Preferably, the negative electrode cover plate includes a vertically distributed negative electrode aluminum plate and a negative electrode insulating gasket;

[0021] The negative electrode aluminum plate is located on the left side of the negative electrode insulating gasket;

[0022] In the middle of the left side of the negative electrode aluminum plate, a negative electrode insulating cushion block is provided;

[0023] A negative electrode pressing plate is arranged inside the negative electrode insulating cushion block;

[0024] The negative electrode pressing plate, the negative electrode insulating cushion block, the negative electrode aluminum plate and the negative electrode insulating gasket are connected by a negative electrode pole column.

[0025] Preferably, at the central positions of the negative electrode aluminum plate and the negative electrode insulating gasket, a first negative electrode pole column installation groove and a second negative electrode pole column installation groove are provided respectively;

[0026] A negative electrode sealing ring is arranged inside the second negative electrode pole column installation groove;

[0027] The negative electrode pressing plate and the negative electrode insulating cushion block are respectively provided with a third negative electrode pole column installation groove and a fourth negative electrode pole column installation groove at the positions corresponding to the first negative electrode pole column installation groove;

[0028] The negative electrode pole column is a negative electrode rivet;

[0029] The negative electrode pole column includes a negative electrode nail body and a negative electrode nail core;

[0030] The negative electrode core is vertically positioned at the middle left side of the negative electrode body;

[0031] The negative electrode nail core passes through the negative electrode sealing ring, the first negative electrode mounting groove and the fourth negative electrode mounting groove in the second negative electrode mounting groove from right to left, and is then riveted into the third negative electrode mounting groove.

[0032] On the left side of the negative electrode aluminum plate, there is a negative electrode protrusion on both the upper and lower sides of the first negative electrode post mounting groove.

[0033] Each negative electrode insulating pad has a negative electrode positioning groove at a position corresponding to each negative electrode protrusion;

[0034] The negative electrode protrusion on the negative electrode aluminum plate engages with the negative electrode positioning groove on the negative electrode insulating pad.

[0035] Preferably, the positive electrode cover plate includes vertically distributed positive electrode aluminum plates and positive electrode insulating pads;

[0036] The positive electrode aluminum plate is located to the right of the positive electrode insulating pad;

[0037] A positive electrode insulating pad is provided in the middle of the right side of the positive electrode aluminum plate;

[0038] A positive electrode pressure plate is installed inside the positive electrode insulating pad;

[0039] The positive electrode pressure plate, positive electrode insulating pad, positive electrode aluminum plate and positive electrode insulating gasket are connected through the positive electrode post.

[0040] Preferably, a first positive electrode mounting groove and a second positive electrode mounting groove are respectively provided at the center of the positive electrode aluminum plate and the positive electrode insulating pad;

[0041] A positive electrode sealing ring is installed in the second positive electrode mounting slot;

[0042] The positive electrode pressure plate and the positive electrode insulating pad are respectively provided with a third positive electrode mounting slot and a fourth positive electrode mounting slot at positions corresponding to the first positive electrode mounting slot;

[0043] The positive terminal is the positive terminal rivet;

[0044] The positive terminal consists of a positive terminal pin body and a positive terminal pin core;

[0045] The positive electrode core is vertically positioned at the middle right side of the positive electrode body;

[0046] The positive electrode nail core passes through the positive electrode sealing ring, the first positive electrode mounting groove and the fourth positive electrode mounting groove in the second positive electrode mounting groove from left to right, and is then riveted into the third positive electrode mounting groove.

[0047] On the right side of the positive electrode aluminum plate, there is a positive electrode protrusion on both the upper and lower sides of the first positive electrode post mounting groove;

[0048] Each positive electrode insulating pad has a positive electrode positioning groove at a position corresponding to each protrusion;

[0049] The positive electrode protrusion on the positive electrode aluminum plate engages with the positive electrode positioning groove on the positive electrode insulating pad.

[0050] Preferably, the insulating support includes a first half-support and a second half-support distributed front to back;

[0051] The second half of the bracket has a connecting post at each of its upper and lower front ends;

[0052] On the rear side of the first half-bracket, a connection hole is provided at the position corresponding to each connecting post;

[0053] Each connecting post is inserted into a corresponding connecting hole;

[0054] The side of the insulating support away from the battery electrode assembly has a groove for receiving the positive electrode tab folding portion;

[0055] Two clips are provided at the top and bottom of the right side of the insulating bracket;

[0056] The positive electrode insulating pad in the positive electrode cover plate has a slot at a position corresponding to the buckle on the insulating bracket.

[0057] The clips engage in the slots.

[0058] Preferably, an explosion-proof valve is provided at the bottom of the battery casing.

[0059] Furthermore, the present invention also provides a method for assembling a novel battery with tabs on both sides as described above, comprising the following steps:

[0060] First, weld the bottom of the negative electrode post of the negative electrode cover plate to one end of the horizontally and vertically distributed negative electrode connecting piece. Then, weld the other end of the negative electrode connecting piece to the negative electrode tab on the left side of the battery electrode assembly. Then, bend the negative electrode connecting piece forward 90° so that the negative electrode connecting piece is perpendicular to the right side of the negative electrode cover plate.

[0061] Then, the positive electrode connecting piece is welded to the positive electrode tab on the right side of the battery electrode assembly, and the negative electrode cover is pressed against the negative electrode side of the battery electrode assembly, so that the negative electrode connecting piece is naturally bent inward to fit against the right side of the negative electrode post of the negative electrode cover, thereby assembling the first assembly.

[0062] Then, the first half bracket and the second half bracket of the insulating bracket are snapped into the root of the positive electrode ear of the battery electrode assembly, and the first half bracket and the second half bracket are fixedly connected by the connecting post, so that the positive electrode ear of the battery electrode assembly passes through the through hole on the insulating bracket, and then the first assembly of the insulating bracket is inserted into the insulating film as a whole.

[0063] Then, the insulating film is heat-melted onto the negative electrode cover plate insulating block and the insulating support, respectively, to assemble the second assembly.

[0064] Then, from the left opening of the battery case, the second assembly is inserted into the battery case. Then, the positive electrode cover plate is welded to the positive electrode connecting piece. Then, the positive electrode cover plate is assembled into the battery case, and the positive electrode cover plate is tightly connected to the insulating bracket through the slot on the positive electrode insulating pad and the buckle on the insulating bracket. At this time, the part of the positive electrode tab located between the positive electrode connecting piece and the insulating bracket is folded into the positive electrode tab folding part receiving groove on the right side of the insulating bracket.

[0065] Finally, the positive and negative electrode covers are welded to the openings on the left and right sides of the battery casing using laser welding to form a seal and obtain the finished battery.

[0066] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a novel battery with tabs on both sides and an assembly method. Its design is scientific and can assemble a safe and reliable rectangular battery with tabs on both sides, ensuring the overall safety performance of the lithium-ion battery. It is beneficial to improve the market application prospects of battery manufacturers' products and has significant practical significance.

[0067] By applying this invention and through the optimized structural design of the insulating support, not only can the insulation effect of the battery electrode assembly be optimized, but the internal space utilization of the battery can also be improved, thereby increasing the overall energy density of the battery. Attached Figure Description

[0068] Figure 1 A three-dimensional exploded disassembly diagram of a novel battery with tabs on both sides provided by the present invention;

[0069] Figure 2 A three-dimensional structural diagram of the second assembly portion included in a novel battery with tabs on both sides provided by the present invention;

[0070] Figure 3 A three-dimensional exploded disassembly diagram of the insulating support in a novel battery with tabs on both sides provided by the present invention.

[0071] Figure 4a A three-dimensional exploded disassembly diagram of the negative electrode cover plate in a novel battery with tabs on both sides provided by the present invention.

[0072] Figure 4b A three-dimensional exploded disassembly diagram of the positive electrode cover plate in a novel battery with tabs on both sides provided by the present invention.

[0073] Figure 5a A three-dimensional structural diagram of the negative electrode aluminum plate in a novel battery with two-sided electrode tabs provided by the present invention.

[0074] Figure 5b A three-dimensional structural diagram of the positive electrode aluminum plate in a novel battery with two-sided electrode tabs provided by the present invention.

[0075] Figure 6a A three-dimensional structural diagram of the negative electrode insulating pad in a novel battery with two-sided electrode tabs provided by the present invention.

[0076] Figure 6b A three-dimensional structural diagram of the positive electrode insulating pad in a novel battery with two-sided electrode tabs provided by the present invention.

[0077] Figure 7a A schematic diagram of the structure of the first assembly before bending in a novel battery with tabs on both sides provided by the present invention;

[0078] Figure 7b A schematic diagram of the structure of the first assembly portion included in a novel battery with tabs on both sides provided by the present invention;

[0079] Figure 8 A three-dimensional structural diagram of the positive electrode cover plate before it is inserted into the casing after the positive electrode cover plate is welded to the positive electrode connecting piece in a novel battery with two electrode tabs provided by the present invention.

[0080] Figure 9 This is a three-dimensional structural diagram of an insulating support included in a novel battery with tabs on both sides, which is to be assembled onto the positive tab according to the present invention. Detailed Implementation

[0081] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0082] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0083] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0084] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0085] See Figures 1 to 9 The present invention provides a novel battery with tabs on both sides, including a battery case 1 with horizontally distributed tabs and openings at both ends;

[0086] Inside the battery casing 1, there are horizontally distributed battery electrode groups 2;

[0087] Negative tabs 201 and positive tabs 202 are respectively provided on the middle of the left and right sides of the battery electrode group 2;

[0088] The negative electrode tab 201 of the battery electrode group 2 is welded to the negative electrode post 511 on the negative electrode cover plate 51 via the negative electrode connecting piece 41.

[0089] The positive electrode tab 202 of the battery electrode group 2 is welded to the positive electrode post 521 on the positive electrode cover plate 52 via the positive electrode connecting piece 42;

[0090] An insulating support 6 is provided between the right side of the battery electrode assembly 2 and the positive electrode cover plate 52;

[0091] The insulating support 6 is provided with a through hole 600 for the positive electrode tab of the battery electrode group 2 to pass through;

[0092] At the upper and lower ends of the negative electrode cover plate 51 on the side facing the battery electrode group 2 (i.e., the right side), a negative electrode cover plate insulating block 5100 is provided respectively;

[0093] The two negative electrode cover plate insulating blocks 5100 are symmetrically arranged up and down;

[0094] The front, back, upper and lower outer surfaces of the battery electrode group 2 are surrounded by a layer of insulating film 3;

[0095] The left side of the insulating film 3 is heat-melt welded to the outer surface of the negative electrode cover plate insulating block 5100 of the negative electrode cover plate 51;

[0096] The right side of the insulating film 3 is heat-melt welded to the front, back, upper and lower surfaces of the insulating bracket 6.

[0097] It should be noted that the transverse width of the negative electrode cover plate insulating block 5100 is 7-8 mm, which plays an insulating role.

[0098] In the present invention, specifically, the shape of the negative electrode cover plate insulating block 5100 is "凵"-shaped or "U"-shaped.

[0099] In the present invention, specifically, the front and back ends of the opposite sides of the two negative electrode cover plate insulating blocks 5100 are respectively connected by a vertically distributed negative electrode insulating strip.

[0100] In the present invention, specifically, see Figure 4a As shown, the negative electrode cover plate 51 includes a vertically distributed negative electrode aluminum plate 510 and a negative electrode insulating gasket 512;

[0101] The negative electrode aluminum plate 510 is located on the left side of the negative electrode insulating gasket 512;

[0102] In the middle of the left side of the negative electrode aluminum plate 510, a negative electrode insulating block 514 (specifically made of hard insulating material PPS) is provided;

[0103] A negative electrode pressing plate 515 is arranged inside the negative electrode insulating block 514;

[0104] The negative electrode pressing plate 515, the negative electrode insulating block 514, the negative electrode aluminum plate 510 and the negative electrode insulating gasket 512 are connected by a negative electrode pole 511 (for example, riveted connection, and the negative electrode pole 511 is a negative electrode rivet).

[0105] Specifically, at the central positions of the negative electrode aluminum plate 510 and the negative electrode insulating gasket 512, a first negative electrode pole installation groove 5101 and a second negative electrode pole installation groove 5102 are provided respectively;

[0106] A negative electrode sealing ring 512 is arranged inside the second negative electrode pole installation groove 5102;

[0107] The negative electrode pressure plate 515 and the negative electrode insulating pad 514 are respectively provided with a third negative electrode mounting groove 5103 and a fourth negative electrode mounting groove 5104 at positions corresponding to the first negative electrode mounting groove 5101.

[0108] The negative terminal post 511 is the negative terminal rivet;

[0109] The negative electrode post 511 includes a negative electrode nail body 5111 and a negative electrode nail core 5112;

[0110] The negative electrode core 511 is vertically disposed in the middle of the left side of the negative electrode body 5111;

[0111] The negative electrode nail core 511 passes through the negative electrode sealing ring 512, the first negative electrode mounting groove 5101 and the fourth negative electrode mounting groove 5104 in the second negative electrode mounting groove 5102 from right to left, and is then riveted into the third negative electrode mounting groove 5103.

[0112] In specific implementation, a negative electrode protrusion 5100 is provided on the left side of the negative electrode aluminum plate 510, on the upper and lower sides of the first negative electrode post mounting groove 5101.

[0113] The negative electrode insulating pad 514 is provided with a negative electrode positioning groove 5140 at a position corresponding to each negative electrode protrusion 5100;

[0114] The negative electrode protrusion 5100 on the negative electrode aluminum plate 510 is engaged with the negative electrode positioning groove 5140 on the negative electrode insulating pad 514.

[0115] It should be noted that during the assembly of the negative electrode cover plate 51, the negative electrode protrusion on the negative electrode aluminum plate 510 engages with the negative electrode positioning groove 5140 on the negative electrode insulating pad 514, which can prevent the components from rotating. This structure can reduce the problem of component rotation during production, reduce the requirements of the production process, and at the same time improve the overall strength of the negative electrode cover plate 51.

[0116] In this invention, for specific implementation, see [link to relevant documentation]. Figure 4b As shown, the positive electrode cover plate 52 includes a vertically distributed positive electrode aluminum plate 520 and a positive electrode insulating pad 522;

[0117] The positive electrode aluminum plate 520 is located to the right of the positive electrode insulating pad 522;

[0118] A positive electrode insulating pad 524 (specifically made of rigid insulating material PPS) is provided in the middle right side of the positive electrode aluminum plate 520.

[0119] A positive electrode pressure plate 525 is provided inside the positive electrode insulating pad 524;

[0120] The positive electrode pressure plate 525, the positive electrode insulating pad 524, the positive electrode aluminum plate 520 and the positive electrode insulating pad 522 are connected by the positive electrode post 521 (e.g., riveted connection, the positive electrode post 5211 is a positive electrode rivet).

[0121] In a specific implementation, the outer surface (i.e. the front and rear sides and the top and bottom sides) of the negative electrode insulating pad 512 of the negative electrode cover plate 51 is covered by the hot-melt welding on the left side of the insulating film 3.

[0122] In specific implementation, a first positive electrode mounting groove 5201 and a second positive electrode mounting groove 5202 are respectively provided at the center of the positive electrode aluminum plate 520 and the positive electrode insulating pad 522.

[0123] A positive electrode sealing ring 522 is provided in the second positive electrode mounting groove 5202;

[0124] The positive electrode pressure plate 525 and the positive electrode insulating pad 524 are respectively provided with a third positive electrode mounting groove 5203 and a fourth positive electrode mounting groove 5204 at positions corresponding to the first positive electrode mounting groove 5201;

[0125] Positive terminal 521 is a positive terminal rivet;

[0126] The positive electrode post 521 includes a positive electrode nail body 5211 and a positive electrode nail core 5212;

[0127] The positive electrode core 521 is vertically disposed in the middle right side of the positive electrode body 5211;

[0128] The positive electrode nail core 521 passes through the positive electrode sealing ring 522, the first positive electrode mounting groove 5201 and the fourth positive electrode mounting groove 5204 in the second positive electrode mounting groove 5202 from left to right, and is then riveted into the third positive electrode mounting groove 5203.

[0129] In specific implementation, on the right side of the positive electrode aluminum plate 520, a positive electrode protrusion 5200 is provided on the upper and lower sides of the first positive electrode post mounting groove 5201.

[0130] The positive electrode insulating pad 524 is provided with a positive electrode positioning groove 5240 at a position corresponding to each protrusion 5200;

[0131] The positive electrode protrusion 5200 on the positive electrode aluminum plate 520 is engaged with the positive electrode positioning groove 5240 on the positive electrode insulating pad 524.

[0132] It should be noted that during the assembly of the positive electrode cover plate 52, the positive electrode protrusion on the positive electrode aluminum plate 520 engages with the positive electrode positioning groove 5240 on the positive electrode insulating pad 524, which can prevent the components from rotating. This structure can reduce the problem of component rotation during production, reduce the requirements of the production process, and at the same time improve the overall strength of the positive electrode cover plate 52.

[0133] In this invention, for specific implementation, see [link to relevant documentation]. Figure 3 As shown, the insulating support 6 includes a first half-support 601 and a second half-support 602 distributed front to back.

[0134] A connecting post 603 is provided at the upper and lower ends of the front side of the second half bracket 602;

[0135] On the rear side of the first half bracket 601, a connection hole is provided at a position corresponding to each connecting post 603;

[0136] Each connecting post 603 is inserted into a corresponding connecting hole.

[0137] In this invention, specifically, the insulating support 6 is provided with a positive electrode tab folding portion receiving groove 604 on the side away from the battery electrode group 2 (i.e., the right side);

[0138] The positive electrode tab folding portion receiving groove 604 is used to receive the folding portion on the positive electrode tab of the battery electrode group 2.

[0139] In this invention, specifically, the positive electrode cover plate 52 has a vertically distributed positive electrode cover plate insulating strip 520 at both the front and rear ends on the side facing the battery electrode group 2 (i.e., the left side).

[0140] In practice, the positive electrode cover plate insulating strip 520 is located in the positive electrode ear folding portion receiving groove 604.

[0141] It should be noted that, considering the battery's assembleability, the horizontal width of the positive electrode cover insulating strip 520 on the positive electrode cover is designed to be 2-3mm.

[0142] It should be noted that the recess depth of the groove 604 in the folded part of the positive electrode tab is 5-6mm.

[0143] In this invention, specifically, two buckles 605 are respectively provided at the upper and lower ends of the right side of the insulating bracket 6;

[0144] The positive electrode insulating pad 522 in the positive electrode cover plate 52 has a slot at a position corresponding to the buckle 605 on the insulating bracket 6;

[0145] The 605 clip is engaged in the slot.

[0146] It should be noted that the novel battery with two tabs provided by this invention uses only one insulating support. Through the optimized structural design of the insulating support, the insulation effect of the battery electrode group can be guaranteed, while improving the internal space utilization of the battery, thereby improving the overall energy density of the battery.

[0147] It should be noted that, in this invention, the insulating film 3 is heat-fused to the negative electrode insulating pad 512 on the negative electrode cover plate 51, replacing the insulating support 6 on the positive electrode side. The negative electrode cover plate 51, the negative electrode lug, and the negative electrode connecting piece are welded first and then inserted into the shell. Since the positive electrode side cannot be directly welded to the positive electrode cover plate insulating block 522, assembly is not possible. Therefore, an insulating support 6 is added on the positive electrode side, which is heat-fused to the right side of the insulating film 3.

[0148] It should also be noted that after the positive electrode is installed in the casing, the positive electrode connecting piece needs to be welded to the positive electrode cover plate. Therefore, a longer portion of the positive electrode tab 202 needs to be reserved, meaning the positive electrode tab 202 will be relatively longer. Figure 8 As shown; the negative electrode side enters the shell first, so the negative electrode tab 201 is relatively short because the insulating support on the negative electrode side is saved, thus saving the length of the negative electrode tab.

[0149] In this invention, specifically, the eight small holes on the positive electrode insulating pad 522 and the negative electrode insulating pad 512 serve to prevent electrolyte residue and also as a fault-proof function.

[0150] In this invention, specifically, the welding state of the negative electrode tab 201 and the positive electrode tab 202 is as follows: Figure 7a As shown. The positive and negative tabs are made of multiple layers of aluminum or copper foil welded together, which has relatively low hardness and is easy to bend. The negative electrode connecting piece 41 is bent forward so that it fits against the negative electrode post 511 of the negative electrode cover plate 51. Then, the negative electrode cover plate 51 is pressed tightly against the negative electrode side of the battery electrode assembly 2, causing the negative electrode tab 201 to bend naturally, as shown. Figure 7b As shown. After the positive electrode tab 202 and the positive electrode connecting piece 42 are soldered, as... Figure 7b As shown, this facilitates subsequent assembly and welding.

[0151] In this invention, specifically, both the negative electrode tab and the positive electrode tab are sections of aluminum foil or copper foil welded together, except that the negative electrode tab is shorter and the positive electrode tab is longer; the negative electrode tab and the positive electrode tab are respectively connected to the negative electrode connecting piece and the positive electrode connecting piece.

[0152] In this invention, specifically, an explosion-proof valve is provided at the bottom of the battery casing 1. When the battery fails, the expanding gas generated inside the battery will burst out from the bottom of the battery casing 1, which serves a safety function.

[0153] In this invention, specifically, both the positive electrode connecting piece 42 and the negative electrode connecting piece 41 employ a multi-layer connecting piece structure. Each single-layer connecting piece has a thickness of 0.1 mm, and typically consists of 6 or 8 layers. Multiple single-layer connecting pieces are welded into a single structure using ultrasonic welding. Single-layer connecting pieces are made of copper and generally require an annealing process to reduce their hardness in order to achieve mass production folding functionality; however, annealed connecting pieces are also prone to oxidation. Multi-layer connecting pieces have low hardness and are easy to fold and less susceptible to oxidation.

[0154] In order to assemble the novel battery with tabs on both sides as described above, this invention also provides an assembly method for the novel battery with tabs on both sides, specifically including the following steps:

[0155] like Figure 7a As shown, firstly, the bottom of the negative electrode post 511 of the negative electrode cover plate 51 is welded to one end of the horizontally and vertically distributed negative electrode connecting piece 41. Then, the other end of the negative electrode connecting piece 41 is welded to the negative electrode tab 201 on the left side of the battery electrode group 2. Then, the negative electrode connecting piece 41 is bent forward 90° so that the negative electrode connecting piece 41 is perpendicular to the right side of the negative electrode cover plate 51.

[0156] Then, the positive electrode connecting piece 42 is welded to the positive electrode tab 202 on the right side of the battery electrode assembly 2, and by pressing the negative electrode cover plate 51 against the negative electrode side of the battery electrode assembly 2, the negative electrode connecting piece 41 is naturally bent inward (i.e., towards the negative electrode cover plate) until it fits against the right side of the negative electrode post 511 of the negative electrode cover plate 51, thus assembling to form the first assembly, as shown below. Figure 7b As shown;

[0157] Then, the first half-support 601 and the second half-support 602 of the insulating bracket 6 are snapped into the root of the positive electrode tab of the battery electrode assembly 2, and the first half-support 601 and the second half-support 602 are fixedly connected by the connecting post 603, so that the positive electrode tab of the battery electrode assembly 2 passes through the through hole 600 on the insulating bracket 6. See Figure 9 As shown, the first assembly of the insulating support 6 is then fitted into the insulating film 3. It should be noted that this step can reduce the defect rate of the insulating support 6 during the assembly process, and at the same time, avoid damage such as bumps to the positive electrode tab.

[0158] Then, the insulating film 3 is heat-fused onto the negative electrode cover plate insulating block 510 and the insulating support 6 of the negative electrode cover plate 51, thereby assembling a second assembly. See [link to documentation]. Figure 2 As shown;

[0159] Then, from the left opening of the battery case 1, the second assembly is inserted into the battery case, and then the positive electrode cover plate 52 is welded to the positive electrode connecting piece 42. Then, the positive electrode cover plate 52 is assembled into the battery case 1, and the positive electrode cover plate 52 is tightly connected to the insulating support 6 through the slot on the positive electrode insulating pad 522 and the buckle 605 on the insulating support 6. At this time, the part of the positive electrode tab located between the positive electrode connecting piece 42 and the insulating support 6 is folded in the positive electrode tab folding portion receiving groove 604 on the right side of the insulating support 6.

[0160] It should be noted that since both the positive electrode insulating pad 522 and the insulating support 6 are made of PP (polypropylene), which are insulating materials, they can provide insulation.

[0161] It should be noted that because the positive tab of the battery electrode group 2 is located between the positive electrode connecting piece 42 and the insulating bracket 6, it is folded in the positive tab folding portion receiving groove 604 on the right side of the insulating bracket 6, and the insulating bracket 6 plays an insulating role, the positive tab will not be connected to the battery shell due to battery vibration or internal pressure, thus avoiding short circuit and effectively improving the safety performance of the battery cell.

[0162] Finally, the positive electrode cover plate 52 and the negative electrode cover plate 51 are welded to the left and right openings of the battery casing 1 by laser welding to form a seal and obtain the finished battery.

[0163] In this invention, specifically, the bottom of the battery casing 1 is provided with an explosion-proof valve. When the battery fails, the expanding gas generated inside the battery will burst out from the bottom of the battery casing 1, which plays a safety role.

[0164] In summary, compared with the prior art, the novel battery and assembly method with tabs on both sides provided by this invention are scientifically designed and can be assembled into a safe and reliable rectangular battery with tabs on both sides, ensuring the overall safety performance of the lithium-ion battery. This is beneficial to improving the market application prospects of battery manufacturers' products and has significant practical significance.

[0165] By applying this invention and through the optimized structural design of the insulating support, not only can the insulation effect of the battery electrode assembly be optimized, but the internal space utilization of the battery can also be improved, thereby increasing the overall energy density of the battery.

[0166] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery with tabs on both sides, characterized in that, It includes a battery case (1) that is horizontally distributed and open at both left and right ends; Inside the battery case (1), a horizontally distributed battery electrode group (2) is provided; In the middle of the left and right sides of the battery electrode group (2), a negative electrode tab (201) and a positive electrode tab (202) are respectively provided; The negative electrode tab (201) of the battery electrode group (2) is welded to the negative electrode post (511) on the negative electrode cover plate (51) through a negative electrode connecting piece (41); The positive electrode tab (202) of the battery electrode group (2) is welded to the positive electrode post (521) on the positive electrode cover plate (52) through a positive electrode connecting piece (42); Between the right side of the battery electrode group (2) and the positive electrode cover plate (52), an insulating bracket (6) is provided; On the insulating bracket (6), a through hole (600) for allowing the positive electrode tab (202) of the battery electrode group (2) to pass through is provided; At the upper and lower ends of the negative electrode cover plate (51) on the side facing the battery electrode group (2), a negative electrode cover plate insulating block (5100) is respectively provided; The two negative electrode cover plate insulating blocks (5100) are symmetrically arranged up and down; Around the front, back, upper and lower outer surfaces of the battery electrode group (2), a layer of insulating film (3) is wrapped; The left side of the insulating film (3) is covered on the outer surface of the negative electrode cover plate insulating block (5100) of the negative electrode cover plate (51); The right side of the insulating film (3) is covered on the front, back, upper and lower surfaces of the insulating bracket (6); The negative electrode cover plate (51) includes a vertically distributed negative electrode aluminum plate (510) and a negative electrode insulating gasket (512); The negative electrode aluminum plate (510) is located on the left side of the negative electrode insulating gasket (512); In the middle of the left side of the negative electrode aluminum plate (510), a negative electrode insulating pad (514) is provided; Inside the negative electrode insulating pad (514), a negative electrode pressing plate (515) is provided; The negative electrode pressing plate (515), the negative electrode insulating pad (514), the negative electrode aluminum plate (510) and the negative electrode insulating gasket (512) are connected through the negative electrode post (511); The positive electrode cover plate (52) includes a vertically distributed positive electrode aluminum plate (520) and a positive electrode insulating gasket (522); The positive electrode aluminum plate (520) is located on the right side of the positive electrode insulating gasket (522); In the middle of the right side of the positive electrode aluminum plate (520), a positive electrode insulating pad (524) is provided; Inside the positive electrode insulating pad (524), a positive electrode pressing plate (525) is provided; The positive electrode pressing plate (525), the positive electrode insulating pad (524), the positive electrode aluminum plate (520) and the positive electrode insulating gasket (522) are connected through the positive electrode post (521).

2. The battery with tabs on both sides as described in claim 1, characterized in that, The shape of the negative electrode cover plate insulating block (5100) is "凵" shaped or "U" shaped.

3. The battery with tabs on both sides as described in claim 1, characterized in that, At the front and back ends of the opposite sides of the two negative electrode cover plate insulating blocks (5100), they are respectively connected by a vertically distributed negative electrode insulating strip.

4. The battery with tabs on both sides as described in claim 1, characterized in that, At the central positions of the negative electrode aluminum plate (510) and the negative electrode insulating gasket (512), a first negative electrode post installation groove (5101) and a second negative electrode post installation groove (5102) are respectively provided; Inside the second negative electrode post installation groove (5102), a negative electrode sealing ring (513) is provided; The negative electrode pressure plate (515) and the negative electrode insulating pad (514) are respectively provided with a third negative electrode mounting groove (5103) and a fourth negative electrode mounting groove (5104) at positions corresponding to the first negative electrode mounting groove (5101). The negative terminal post (511) is the negative terminal rivet; The negative electrode post (511) includes a negative electrode nail body (5111) and a negative electrode nail core (5112). The negative electrode core (5112) is vertically positioned at the middle left side of the negative electrode body (5111); The negative electrode nail core (5112) passes through the negative electrode sealing ring (513), the first negative electrode mounting groove (5101) and the fourth negative electrode mounting groove (5104) in the second negative electrode mounting groove (5102) from right to left, and is then riveted into the third negative electrode mounting groove (5103). On the left side of the negative electrode aluminum plate (510), a negative electrode protrusion is provided on the upper and lower sides of the first negative electrode post mounting groove (5101); The negative electrode insulating pad (514) is provided with a negative electrode positioning groove (5140) at a position corresponding to each negative electrode protrusion. The negative electrode protrusion on the negative electrode aluminum plate (510) engages with the negative electrode positioning groove (5140) on the negative electrode insulating pad (514).

5. The battery with tabs on both sides as described in claim 1, characterized in that, The positive electrode aluminum plate (520) and the positive electrode insulating pad (522) are respectively provided with a first positive electrode post mounting groove (5201) and a second positive electrode post mounting groove (5202). A positive electrode sealing ring (523) is provided in the second positive electrode mounting groove (5202). The positive electrode pressure plate (525) and the positive electrode insulating pad (524) are respectively provided with a third positive electrode mounting groove (5203) and a fourth positive electrode mounting groove (5204) at positions corresponding to the first positive electrode mounting groove (5201). The positive terminal post (521) is the positive terminal rivet; The positive electrode post (521) includes a positive electrode nail body (5211) and a positive electrode nail core (5212). The positive electrode core (5212) is vertically disposed in the middle of the right side of the positive electrode body (5211); The positive electrode nail core (5212) passes through the positive electrode sealing ring (523), the first positive electrode mounting groove (5201) and the fourth positive electrode mounting groove (5204) in the second positive electrode mounting groove (5202) from left to right, and is then riveted into the third positive electrode mounting groove (5203). On the right side of the positive electrode aluminum plate (520), a positive electrode protrusion (5200) is provided on the upper and lower sides of the first positive electrode post mounting groove (5201). The positive electrode insulating pad (524) has a positive electrode positioning groove (5240) at a position corresponding to each protrusion (5200). The positive electrode protrusion (5200) on the positive electrode aluminum plate (520) is engaged with the positive electrode positioning groove (5240) on the positive electrode insulating pad (524).

6. The battery with tabs on both sides as described in claim 1, characterized in that, The insulating support (6) includes a first half-support (601) and a second half-support (602) distributed front and rear. The upper and lower ends of the front side of the second half bracket (602) are respectively provided with a connecting post (603). On the rear side of the first half bracket (601), a connection hole is provided at a position corresponding to each connecting post (603); Each connecting post (603) is inserted into a corresponding connecting hole; The insulating bracket (6) is provided with a positive electrode tab folding portion receiving groove (604) on the side away from the battery electrode group (2). Two buckles (605) are respectively provided at the upper and lower ends of the right side of the insulating bracket (6). The positive electrode insulating pad (522) in the positive electrode cover plate (52) has a slot at a position corresponding to the buckle (605) on the insulating bracket (6); The buckle (605) is engaged in the slot.

7. The battery with tabs on both sides as described in claim 1, characterized in that, An explosion-proof valve is provided at the bottom of the battery casing (1).

8. A method for assembling a battery with tabs on both sides as described in any one of claims 1 to 7, characterized in that, Includes the following steps: First, weld the bottom of the negative electrode post (511) of the negative electrode cover plate (51) to one end of the horizontally vertically distributed negative electrode connecting piece (41), then weld the other end of the negative electrode connecting piece (41) to the negative electrode tab (201) on the left side of the battery electrode assembly (2), and then bend the negative electrode connecting piece (41) forward by 90° so that the negative electrode connecting piece (41) is perpendicular to the right side of the negative electrode cover plate (51); Then, the positive electrode connecting piece (42) is welded to the positive electrode tab (202) on the right side of the battery electrode assembly (2), and the negative electrode cover plate (51) is pressed against the negative electrode side of the battery electrode assembly (2) so that the negative electrode connecting piece (41) is naturally bent inward to fit against the right side of the negative electrode post (511) of the negative electrode cover plate (51), thereby assembling the first assembly; Then, the first half bracket (601) and the second half bracket (602) of the insulating bracket (6) are snapped into the root of the positive electrode ear of the battery electrode assembly (2), and the first half bracket (601) and the second half bracket (602) are fixedly connected by the connecting post (603), so that the positive electrode ear of the battery electrode assembly (2) passes through the through hole (600) on the insulating bracket (6), and then the first assembly of the insulating bracket (6) is fitted into the insulating film (3); Then, the insulating film (3) is heat-melted onto the negative electrode cover plate insulating block (5100) and the insulating support (6) of the negative electrode cover plate (51) respectively, thereby assembling to form the second assembly; Then, from the left opening of the battery case (1), the second assembly is inserted into the battery case, and then the positive electrode cover plate (52) is welded to the positive electrode connecting piece (42). Then the positive electrode cover plate (52) is assembled into the battery case (1), and the positive electrode cover plate (52) is tightly connected to the insulating bracket (6) through the slot on the positive electrode insulating pad (522) and the buckle (605) on the insulating bracket (6). At this time, the part of the positive electrode tab located between the positive electrode connecting piece (42) and the insulating bracket (6) is folded in the positive electrode tab folding part receiving groove (604) on the right side of the insulating bracket (6). Finally, the positive electrode cover plate (52) and the negative electrode cover plate (51) are welded to the left and right openings of the battery casing (1) by laser welding to form a seal and obtain the finished battery.

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