A lithium battery with a bipolar ear symmetrical arrangement structure

Abstract

The utility model discloses a lithium battery with bipolar ear symmetrical arrangement structure, which comprises a plurality of battery bodies, positive and negative bipolar ear assemblies are symmetrically arranged at both sides of one end of the battery bodies, and the bipolar ear assemblies are symmetrically distributed along the central axis of the battery bodies. The bipolar ear assembly is composed of a bridging metal sheet covered in the battery body and connected to an internal pole piece, and two groups of ear units connected to both ends of one side of the bridging metal sheet. The ear unit comprises a T-shaped ear with a column part having an external thread and welded to the bridging metal sheet, an insulating disc sleeved on a seat part and fixed to the surface of the battery body, and two groups of elastic electrodes symmetrically arranged on the seat part. The ear units of adjacent battery bodies are connected through a guide plate assembly, the guide plate assembly adopts a detachable structure fastened by screws, and cooperates with the spring compensation design of the elastic electrodes to realize reliable connection. The lithium battery optimizes the current path through symmetrical bipolar ear arrangement, replaces welding with mechanical fastening + elastic contact, and eliminates the risk of virtual welding and welding failure.

Description

Technical Field

[0001] This utility model relates to lithium batteries, specifically to a lithium battery with a bipolar tab symmetrical arrangement structure. Background Technology

[0002] In practical applications of lithium batteries, especially in battery packs composed of multiple individual cells connected in series or parallel, the tabs serve as the connecting bridge between the internal electrode plates and the external circuitry. Their reliability directly determines the overall performance and safety of the battery pack. Traditional lithium batteries often employ a single-tab or asymmetrical tab design, and are typically fixed using welding during the connection process. However, this connection method has significant drawbacks: on the one hand, the welding process requires high operational precision and is prone to problems such as excessively high welding temperatures and incomplete weld connections, leading to poor contact between the tabs and connecting components; on the other hand, the battery undergoes slight expansion and contraction during charge and discharge cycles, and after long-term use, the weld joints are prone to cracking and detachment due to stress fatigue. Once incomplete welds or detachment occur, it will not only increase the internal resistance of the battery pack and reduce charging and discharging efficiency, but may also cause local overheating in severe cases, posing a safety hazard. Furthermore, the current conduction path in traditional electrode connection structures is uneven, easily leading to localized current concentrations and accelerating electrode aging. Therefore, there is an urgent need for a lithium battery electrode structure that can solve the problems of poor soldering and desoldering from a structural design perspective, and improve connection stability and current conduction uniformity. Utility Model Content

[0003] To address the shortcomings of existing lithium battery technologies, such as poor soldering, desoldering, and uneven current conduction in the electrode connection, this invention provides a lithium battery with a symmetrical arrangement of dual electrodes. By optimizing the electrode arrangement and improving the connection structure, reliable connection between the electrodes and external components is achieved, eliminating the risk of poor soldering and desoldering, while improving current conduction efficiency and overall battery pack stability.

[0004] To solve the above technical problems, the present invention is achieved through the following solution: The present invention provides a lithium battery with a bipolar tab symmetrical arrangement structure, comprising multiple battery bodies, which are connected by side casings to form a battery pack. Bipolar tab assemblies are provided on both sides of one end of each battery body, and two sets of bipolar tab assemblies are symmetrically arranged about the central axis of the battery body. One set of bipolar tab assemblies is a positive bipolar tab assembly, and the other set of bipolar tab assemblies is a negative bipolar tab assembly. The bipolar ear assembly includes: A bridging metal sheet is encased within the battery body and connected to the electrode plates inside the battery body. The electrode unit has two sets, and the two sets of electrode units are connected to both ends of one side of the bridging metal plate; The electrode unit includes: Two T-shaped tabs are provided. The seat of each T-shaped tab is welded to one end of the bridging metal sheet, and the post part is provided with external threads. Two insulating discs are fitted one-to-one onto the base and adhered to the surface of the battery body; Two sets of elastic electrodes are disposed on the base and symmetrically located on both sides of the column. In any two adjacent battery cells, the two closest tab units are connected by a guide plate assembly.

[0005] Furthermore, the base is provided with two mounting slots, and two sets of elastic electrodes are mounted one-to-one in the two mounting slots.

[0006] Furthermore, the elastic electrode includes: A conductive fastener fixed to the mounting groove, the conductive fastener having a cylindrical cavity; A spring is placed in the cylindrical cavity; The electrode block has a raised ring on its outer peripheral side, and the inner end of the electrode block abuts against the spring. A limiting ring is screwed onto the conductive fastener and restricts the convex ring.

[0007] Furthermore, the guide plate assembly includes: The guide plate is a metal conductive plate. The first surface of the guide plate has a first groove that matches the contour of the base. The bottom surface of the first groove has a second groove that matches the two electrode blocks. The first groove also has a through hole that passes through both ends, allowing the column to pass through. A gasket is provided on the second side of the guide plate and fitted onto the column portion; Screws are tightened onto the column to press the gasket.

[0008] Furthermore, threadlocker is applied between the screw and the post.

[0009] Furthermore, the outer surfaces of the gaskets and screws are plated with a nickel layer.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model can solve the problem of poor welding and detachment of the electrode tabs: This utility model adopts the connection method of "mechanical fastening + elastic contact", and the guide plate is fixed by the threaded connection between the screw and the column, which replaces the traditional welding process and fundamentally eliminates the risk of poor welding and detachment; at the same time, the spring of the elastic electrode can compensate for the displacement caused by the assembly gap and the expansion and contraction of the battery, ensuring that the electrode block and the guide plate are always in reliable contact. 2. The present invention provides uniform and efficient current conduction: the bipolar tab assembly is symmetrically arranged along the central axis of the battery body, and the two sets of tab units conduct current synchronously, avoiding the current concentration phenomenon of the traditional single tab structure; the bridging metal sheet increases the contact area with the internal electrode, further reducing the internal resistance of current conduction and improving the battery charging and discharging efficiency. 3. This utility model is easy to assemble and maintain: The guide plate assembly adopts a detachable structure, and no professional welding equipment is required during assembly. The connection can be completed by tightening screws. During later maintenance, the screws can be directly removed to replace the faulty parts, reducing maintenance costs and difficulties. 4. This utility model has high structural stability and safety: the insulating disc achieves insulation isolation between the electrode tab and the battery body, avoiding the risk of short circuit; the design of screws coated with thread adhesive, washers and screws nickel-plated, etc., improves the structure's anti-loosening and anti-corrosion performance, extends the battery pack's service life, and ensures safe use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the two battery bodies of this utility model after they are attached together.

[0012] Figure 2 This is a schematic diagram of the bipolar ear assembly of this utility model.

[0013] Figure 3 This is a schematic diagram of the structure of the guide plate assembly of this utility model.

[0014] Figure 4 This is a schematic diagram of the structure of the elastic electrode of this utility model.

[0015] Figure 5 A schematic diagram of the charging circuit configured for the lithium battery of this utility model.

[0016] The attached diagram is labeled as follows: 1-Battery body, 2-Bipolar tab assembly, 21-Seat, 22-Elastic electrode, 221-Electrode block, 222-Spring, 223-Cylinder cavity, 224-Conductive fixing component, 23-Insulating disc, 24-Cylinder, 25-Bridging metal sheet, 3-Guide plate assembly, 31-Screw, 32-Washer, 33-Guide plate, 34-Second slot, 35-First slot.

[0017] Figure 5 The markings in the diagram are: MCU10, battery voltage acquisition circuit 20, charging start circuit 30, charging switch circuit 40, and charger voltage detection circuit 50. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Example 1: The specific structure of this utility model is as follows: Please refer to the appendix. Figure 1-4 The present invention discloses a lithium battery with a bipolar tab symmetrical arrangement structure, comprising multiple battery bodies 1, which are connected by side shells to form a battery pack. Bipolar tab assemblies 2 are provided on both sides of one end of each battery body 1. The two sets of bipolar tab assemblies 2 are symmetrically arranged about the central axis of the battery body 1. One set of bipolar tab assemblies 2 is a positive bipolar tab assembly, and the other set of bipolar tab assemblies 2 is a negative bipolar tab assembly. The bipolar ear assembly 2 includes: A bridging metal sheet 25 is enclosed within the battery body 1 and connected to the electrode plates inside the battery body 1. The electrode unit is provided in two sets, and the two sets of electrode units are connected to both ends of one side of the bridging metal plate 25; The electrode unit includes: Two T-shaped tabs are provided. The seat portion 21 of the two T-shaped tabs is welded to one end of the bridging metal sheet 25, and the post portion 24 is provided with external threads. Two insulating discs 23 are fitted one-to-one onto the base 21 and are adhered to the surface of the battery body 1; Two sets of elastic electrodes 22 are disposed on the seat portion 21 and symmetrically located on both sides of the column portion 24; In any two adjacent battery bodies 1, the two closest electrode units are connected by a guide plate assembly 3.

[0021] The base 21 is provided with two mounting slots, and two sets of elastic electrodes 22 are mounted one-to-one in the two mounting slots.

[0022] The elastic electrode 22 includes: A conductive fastener 224 is fixed to the mounting groove, and the conductive fastener 224 is provided with a cylindrical cavity 223; Spring 222 is placed in the cylindrical cavity 223; The electrode block 221 has a raised ring on its outer peripheral side, and the inner end of the electrode block 221 abuts against the spring 222. A limiting ring is screwed onto the conductive fixing member 224 and restricts the convex ring.

[0023] The guide plate assembly 3 includes: The guide plate 33 is a metal conductive plate. The first surface of the guide plate 33 has a first groove 35 that matches the contour of the seat 21. The bottom surface of the first groove 35 is provided with a second groove 34 that matches the two electrode blocks 221. The first groove 35 is also provided with a through hole that passes through both ends, and the through hole allows the column 24 to pass through. Gasket 32 ​​is disposed on the second side of guide plate 33 and sleeved on column portion 24; Screw 31 is tightened onto the post 24 to press the gasket 32.

[0024] Thread adhesive is applied between the screw 31 and the post 24.

[0025] The outer surfaces of the gasket 32 ​​and screw 31 are plated with a nickel layer.

[0026] Example 2: Bipolar tab assembly assembly: The bridging metal sheet 25 is partially embedded into the battery body 1 and welded and fixed to the internal electrode sheet; The base 21 of the two T-shaped tabs is welded to both ends of the bridging metal sheet 25 to ensure a firm weld; An insulating disc 23 is fitted onto the seat 21 of each T-shaped tab, and the insulating disc 23 is bonded and fixed to the surface of the battery body 1. Insert the elastic electrode 22 into the mounting groove of the seat 21: First, fix the conductive fixing part 224 into the mounting groove, then install the spring 222 and the electrode block 221 in sequence, and finally screw in the limiting ring to complete the fixation, forming a complete bipolar ear assembly 2. Repeat the above steps to assemble the positive and negative bipolar tab assemblies 2 on both sides of one end of the battery body 1, ensuring that the two sets of assemblies are symmetrically distributed. Battery pack assembly: Multiple battery bodies 1 with assembled bipolar tab assemblies 2 are placed in a preset arrangement so that the tab units of adjacent battery bodies 1 correspond to each other. Take the guide plate 33 and align its first slot 35 with the seat 21 of the two adjacent electrode units, so that the post 24 passes through the through hole and the electrode block 221 is embedded in the second slot 34. A washer 32 is fitted onto the column 24, then screws 31 are screwed in, and thread-locking adhesive is applied to the threads. The screws 31 are then tightened to press and fix the guide plate 33. Repeat the above steps to complete the connection of all adjacent battery bodies 1, and finally encapsulate all battery bodies 1 into a complete battery pack through the side casing.

[0027] Example 3: like Figure 5 As shown, Figure 5 This is a schematic diagram of the charging circuit configured for the lithium battery of this utility model. When a C+ or C- charger is connected, the charging start circuit 30 is turned on, the power is turned on, the MCU10 is powered on and initializes. The battery voltage acquisition circuit 20 scans the battery voltage, calculates the current voltage of the battery pack, and then turns off the charging switch circuit 40, at which point charging is prohibited. The charger voltage is obtained by sampling through the charger voltage detection circuit 50 and the resistor voltage divider, and then compared with the standard voltage. When the voltage is within the normal range, the charging switch is turned on to continue charging. When the charger voltage exceeds the limit, the prohibited mode is maintained, thereby protecting the battery pack.

[0028] In summary, this utility model can solve the problem of poor soldering and desoldering of the electrode tabs: This utility model adopts a connection method of "mechanical fastening + elastic contact", and fixes the guide plate by screws and threaded connection of the column, replacing the traditional welding process and fundamentally eliminating the risk of poor soldering and desoldering; at the same time, the spring of the elastic electrode can compensate for the displacement caused by assembly gap and battery expansion and contraction, ensuring that the electrode block and the guide plate are always in reliable contact. This invention features uniform and efficient current conduction: the bipolar tab assembly is symmetrically arranged along the central axis of the battery body, and the two sets of tab units conduct current synchronously, avoiding the current concentration phenomenon of the traditional single-tab structure; the bridging metal sheet increases the contact area with the internal electrode, further reducing the internal resistance of current conduction and improving the battery charging and discharging efficiency. This utility model is easy to assemble and maintain: the guide plate assembly adopts a detachable structure, and no professional welding equipment is required during assembly. The connection can be completed by tightening screws. During later maintenance, the screws can be directly removed to replace the faulty parts, reducing maintenance costs and difficulty. This utility model features high structural stability and safety: the insulating disc provides insulation between the tabs and the battery body, avoiding the risk of short circuits; the screws are coated with thread-locking adhesive, and the design includes washers and nickel plating on the screws, which enhances the structure's anti-loosening and anti-corrosion performance, extends the battery pack's service life, and ensures safe use.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A lithium battery with a bipolar tab symmetrical arrangement structure, comprising multiple battery bodies (1), the multiple battery bodies (1) forming a battery pack via side casings, characterized in that, Bipolar tab assemblies (2) are provided on both sides of one end of the battery body (1). The two sets of bipolar tab assemblies (2) are symmetrically arranged about the central axis of the battery body (1). One set of bipolar tab assemblies (2) is a positive bipolar tab assembly, and the other set of bipolar tab assemblies (2) is a negative bipolar tab assembly. The bipolar ear assembly (2) includes: A bridging metal sheet (25) is enclosed within the battery body (1) and connected to the electrode plates inside the battery body (1); The electrode unit is provided in two sets, and the two sets of electrode units are connected to both ends of one side of the bridging metal sheet (25); The electrode unit includes: Two T-shaped tabs are provided. The seat (21) of the two T-shaped tabs is welded to one end of the bridging metal sheet (25), and the post (24) is provided with external threads. Two insulating discs (23) are fitted one-to-one onto the base (21) and bonded to the surface of the battery body (1); Two sets of elastic electrodes (22) are disposed on the seat (21) and symmetrically located on both sides of the column (24); In any two adjacent battery bodies (1), the two closest electrode units are connected by a guide plate assembly (3).

2. A lithium battery with a symmetrical arrangement of bipolar tabs according to claim 1, characterized in that, The seat (21) is provided with two mounting slots, and two sets of elastic electrodes (22) are installed one-to-one in the two mounting slots.

3. A lithium battery with a symmetrical arrangement of bipolar tabs according to claim 2, characterized in that, The elastic electrode (22) includes: A conductive fastener (224) is fixed to the mounting groove, and the conductive fastener (224) is provided with a cylindrical cavity (223); Spring (222) is placed in the cylindrical cavity (223); The electrode block (221) has a raised ring on its outer peripheral side, and the inner end of the electrode block (221) abuts against the spring (222). A limiting ring is screwed onto the conductive fastener (224) and restricts the convex ring.

4. A lithium battery with a symmetrical arrangement of bipolar tabs according to claim 3, characterized in that, The guide plate assembly (3) includes: The guide plate (33) is a metal conductive plate. The first surface of the guide plate (33) has a first slot (35) that matches the contour of the seat (21). The bottom surface of the first slot (35) is provided with a second slot (34) that matches the two electrode blocks (221). The first slot (35) is also provided with a through hole that passes through both ends, through which the column (24) passes. Gasket (32) is provided on the second side of guide plate (33) and sleeved on the column (24); Screw (31) is tightened onto the post (24) to press the gasket (32).

5. A lithium battery with a symmetrical arrangement of bipolar tabs according to claim 4, characterized in that, Threadlocker is applied between the screw (31) and the post (24).

6. A lithium battery with a symmetrical arrangement of bipolar tabs according to claim 4, characterized in that, The outer surfaces of the gasket (32) and screw (31) are plated with a nickel layer.

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