Composite busbar and battery cell

Abstract

The utility model discloses composite busbar and electric core relates to power battery technical field, including the casing, the battery roll core is assembled in the cavity of casing, and the both ends of battery roll core are assembled with positive pole assembly and negative pole assembly respectively, and the positive pole assembly includes positive pole panel, and the positive pole panel is connected with the positive pole output end of battery roll core, and the negative pole assembly includes negative pole panel, and the negative pole panel is connected with the negative pole output end of battery roll core, and the positive pole panel and negative pole panel are the symmetrical structure design about battery roll core, and the protruding cap structure is integrally formed on the side of negative pole panel and positive pole panel to battery roll core, through adopting the protruding cap structure of the integral molding with positive pole panel, negative pole panel, and the protruding cap structure forms the whole of continuous no splicing with positive pole panel and negative pole panel, avoids the partial fracture risk caused by stress concentration, and the liquid storage groove formed by recess stably stores the excess electrolyte in electric core, and provides reliable reserve for subsequent electrolyte supply.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to composite busbars and battery cells. Background Technology

[0002] The composite busbar is a core component for achieving efficient power transmission and orderly electrolyte management in battery cells. One end connects to the battery core, and the other end connects to the external circuit through the terminal post. It also undertakes key functions such as electrolyte storage, current conduction, and sealing. As a complete energy storage unit, the battery cell relies on the composite busbar to convert the electrochemical reaction of the battery core into a stable external current output. At the same time, the structural design of the busbar ensures that the electrolyte does not leak and the core does not deform, ultimately achieving the goal of long life and high safety. In practical applications, similar composite busbars and battery cells on the market still have several technical pain points: First, the reliability of the electrolyte storage structure is poor. Most products use an additional electrolyte storage box welded to the outside of the panel to store the electrolyte. This not only increases the overall weight of the battery cell and the assembly process, but also makes the welded joints prone to cracks due to stress concentration, leading to leakage of electrolyte during long-term use. Second, the panel has insufficient resistance to deformation. Traditional positive and negative electrode panels are mostly two-dimensional planar thin plate structures with a small bending section modulus. When the battery core expands due to the expansion of the active material during charge and discharge cycles, the panel is prone to bending and denting, which in turn damages the connection and sealing with the core.

[0003] Therefore, this utility model proposes a composite busbar and battery cell to solve the above problems. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a composite busbar and battery cell, comprising a housing, wherein a battery core is assembled in the inner cavity of the housing, and a positive electrode assembly and a negative electrode assembly are respectively assembled at both ends of the battery core. The positive electrode assembly includes a positive electrode panel, which is connected to the positive output end of the battery core, and the negative electrode assembly includes a negative electrode panel, which is connected to the negative output end of the battery core. The positive and negative electrode panels are designed with a symmetrical structure about the battery core. The negative and positive electrode panels are integrally formed with a convex structure on the side facing the battery core. The convex structure is recessed towards the battery core to form a liquid storage groove. The negative and positive electrode panels are provided with a flow guiding structure. One end of the flow guiding structure is connected to the liquid storage groove, and the other end extends to the connection surface between the negative electrode panel and the battery core.

[0006] As a preferred embodiment of the composite busbar and battery cell of this utility model, the convex structure is an integrated panel convex structure with the negative electrode panel facing the battery core side. The panel convex structure includes at least three convex units that are evenly distributed radially, a transition arc segment connecting adjacent convex units, and a central connecting part located at the geometric center. The convex bulge unit extends from the surface of the negative electrode panel toward the battery core, and the inner region of each convex bulge unit is recessed away from the battery core to form a liquid storage groove for storing electrolyte.

[0007] In a preferred embodiment of the composite busbar and battery cell of this utility model, a pure aluminum electrode post is fixed on the side of the positive electrode panel away from the battery core, and the pure aluminum electrode post is used to conduct the positive current of the battery core; a copper-aluminum composite electrode post is fixed on the side of the negative electrode panel away from the battery core, and the copper-aluminum composite electrode post is used to conduct the negative current of the battery core.

[0008] As a preferred embodiment of the composite busbar and battery cell of this utility model, an isolation layer is provided in the interlayer between the battery core and the housing, and the isolation layer is provided between the positive electrode panel and the negative electrode panel of the battery core. The edge region of the insulating layer extends to the interface between the battery core and the negative electrode panel.

[0009] As a preferred embodiment of the composite busbar and battery cell of this utility model, the flow guiding structure includes a radially arranged circular array of liquid guiding strips and a plurality of concentric rings arranged outward along the ring; the liquid guiding strips extend radially along the positive electrode panel, the included angle between adjacent liquid guiding strips is equal, and one end of the liquid guiding strip is smoothly connected to the transition arc of the panel convex hull, and the other end extends to the edge of the connection surface of the battery core of the positive electrode panel.

[0010] As a preferred embodiment of the composite manifold and battery cell of this utility model, wherein: the concentric ring strip is a plurality of annular protrusions arranged around the center of the panel, the height of the concentric ring strip is lower than that of the liquid guiding strip, the concentric ring strip and the liquid guiding strip intersect to form a grid-like liquid blocking node, and both the concentric ring strip and the liquid guiding strip are protrusion structures integrally formed with the panel.

[0011] A battery cell, wherein the battery core, positive electrode assembly, negative electrode assembly, and housing of the composite busbar together constitute the main body of the battery cell for energy storage.

[0012] The beneficial effects of this utility model are: 1. By adopting a convex hull structure integrally formed with the positive and negative electrode panels, the convex hull structure forms a continuous and seamless whole with the positive and negative electrode panels, avoiding the risk of local fracture caused by stress concentration. The recessed storage grooves stably store excess electrolyte in the cell, providing a reliable reserve for subsequent electrolyte replenishment. 2. The convex hull structure, consisting of at least three radially distributed convex hull units, a transition arc segment, and a central connecting part, forms a three-dimensional truss structure, enhancing the strength of both the positive and negative electrode panels. The sidewalls of each convex hull unit act as reinforcing ribs, significantly increasing the effective bending cross-section of the panel. Simultaneously, the radially distributed convex hull units create multi-directional force transmission paths, dispersing the expansion force generated during battery cell charging and discharging to multiple directions, including the panel edges and the central connecting part, preventing force concentration that could lead to panel bending or denting. 3. The electrolyte is directionally and uniformly conducted through a flow-guiding structure composed of straight liquid-guiding strips and concentric ring strips. The straight liquid-guiding strips extend radially along the positive and negative electrode panels, with one end smoothly connecting to the transition arc of the panel bulge and the other end extending to the connection surface between the panel and the battery core. This allows for precise guidance of the electrolyte in the storage groove to the core. The concentric ring strips intersect with the straight liquid-guiding strips to form a grid-like liquid-blocking node, which can temporarily accumulate the electrolyte, preventing it from flowing out too quickly and ensuring uniform penetration of the electrolyte into the battery core, thus guaranteeing the overall performance and cycle life of the cell. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the battery cell structure in this utility model; Figure 2 This is a schematic diagram of the positive electrode component in this utility model; Figure 3 This is a schematic diagram of the negative electrode component in this utility model; Figure 4 This is a schematic diagram of the convex hull structure in this utility model; Figure 5 This is a schematic diagram of the structure of the isolation layer in the figure of this utility model; Figure 6 This is a schematic diagram of the flow guiding structure in this utility model.

[0015] Explanation of reference numerals in the attached drawings: 001, casing; 002, battery core; 003, positive electrode assembly; 0031, positive electrode panel; 00311, liquid injection hole; 0032, sealing aluminum nail; 0033, sealing glue nail; 0034, positive electrode insulating ring; 0035, pure aluminum electrode post; 004, negative electrode assembly; 0041, negative electrode panel; 0042, negative electrode insulating ring; 0043, copper-aluminum composite electrode post; 005, convex structure; 0051, panel convex convex; 00511, convex unit; 00512, transition arc segment; 00513, central connection part; 0052, liquid storage groove; 006, flow guiding structure; 0061, liquid guiding strip; 0062, concentric ring strip; 007, separator layer. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0019] Example 1

[0020] Reference Figures 1-5 The first embodiment of this utility model is shown, which provides a composite busbar, including a housing 001. A battery core 002 is assembled in the inner cavity of the housing 001. The battery core 002 is the core component for energy storage. Its two ends correspond to the positive output end and the negative output end, respectively. It is formed by alternately winding multiple positive electrode plates, multiple negative electrode plates and an insulating layer 007. The current collector ends of all positive electrode plates are connected to form the positive output end, and the current collector ends of all negative electrode plates are connected to form the negative output end. The two ends of the battery core 002 are respectively equipped with a positive electrode assembly 003 and a negative electrode assembly 004 through the positive output end and the negative output end, respectively. The positive electrode assembly 003 includes a positive electrode panel 0031, which is connected to the positive output end of the battery core 002. The negative electrode assembly 004 includes a negative electrode panel 0041, which is connected to the negative output end of the battery core 002. The positive electrode panel 0031 and the negative electrode panel 0041 are symmetrically designed with respect to the battery core 002. A convex structure 005 is integrally formed on the side of the negative electrode panel 0041 and the positive electrode panel 0031 facing the battery core 002. The convex structure 005 is recessed towards the battery core 002 to form a liquid storage groove 0052, which stores excess electrolyte within the battery cell. A flow guiding structure 006 is provided on the negative electrode panel 0041 and the positive electrode panel 0031. One end of the flow guiding structure 006 communicates with the liquid storage groove 0052, and the other end extends to the connection surface between the negative electrode panel 0041 and the battery core 002, allowing the electrolyte in the liquid storage groove 0052 to flow to the battery core 002 through the flow guiding structure 006. An injection hole 00311 is provided on the positive electrode panel 00311, and a sealing aluminum nail 0032 and a sealing rubber nail 00 are installed inside the injection hole 00311. 33. The sealing nail 0033 is located between the sealing aluminum nail 0032 and the inner wall of the injection hole 00311. By placing the sealing nail 0033 between the sealing aluminum nail 0032 and the inner wall of the injection hole 00311, the flexible characteristics of the sealing nail 0033 are used to fill the tiny gaps between the sealing aluminum nail 0032 and the injection hole 00311 caused by the processing precision, thus completely blocking the electrolyte leakage path. At the same time, the elastic expansion and contraction of the sealing nail 0033 adapts to the temperature fluctuations and vibration deformation during the use of the battery cell, avoiding the failure of the rigid seal due to thermal expansion and contraction or displacement. The housing 001 is wrapped around the outside of the battery core 002, the positive electrode assembly 003 and the negative electrode assembly 004. Its inner wall matches the edge of the positive electrode panel 0031 and the negative electrode panel 0041, encapsulating the battery core 002, the positive electrode assembly 003 and the negative electrode assembly 004 inside and forming an integral structure.

[0021] Furthermore, the injection hole 00311 has a stepped hole structure, including a large-diameter section near the inside of the housing 001 and a small-diameter section near the outside; the head of the sealing aluminum nail 0032 is adapted to the large-diameter section, and the rod is adapted to the small-diameter section, and the outer wall of the sealing aluminum nail 0032 is provided with an annular groove; the sealing rubber nail 0033 has an O-ring structure, which is engaged in the annular groove and has an interference fit with the inner wall of the injection hole 00311 to form a double seal.

[0022] The positive electrode assembly 003 also includes a positive electrode insulating ring 0034, and the negative electrode assembly 004 also includes a negative electrode insulating ring 0042. Both the positive electrode insulating ring 0034 and the negative electrode insulating ring 0042 are flat ring structures. The positive electrode insulating ring 0034 is only attached to the side surface of the positive electrode panel 0031 facing the battery core 002, covering the mating edge of the pure aluminum electrode post 0035 and the through hole of the positive electrode panel 0031. The negative electrode insulating ring 0042 is only attached to the side surface of the negative electrode panel 0041 facing the battery core 002, covering the mating edge of the copper-aluminum composite electrode post 0043 and the through hole of the negative electrode panel 0041.

[0023] Reference Figure 4 and Figure 6 As shown, the convex hull structure 005 is an integrated panel convex hull 0051 on the side of the negative electrode panel 0041 facing the battery core 002. The panel convex hull 0051 includes at least three convex hull units 00511 that are evenly distributed radially, a transition arc segment 00512 connecting adjacent convex hull units 00511, and a central connecting part 00513 located at the geometric center. The convex unit 00511 extends from the surface of the negative electrode panel 0041 toward the battery core 002. The inner region of each convex unit 00511 is recessed away from the battery core 002 to form a liquid storage groove 0052 for storing electrolyte.

[0024] Furthermore, compared to the traditional negative electrode panel 0041 and positive electrode panel 0031, which often require additional welding of liquid storage boxes, but which have several problems such as increased weight, easy leakage, and affecting panel strength, the proposed convex structure 005 adopts an integrated molding process with the negative electrode panel 0041 and positive electrode panel 0031, making the convex structure 005 and positive electrode panel 0031 a continuous and seamless whole, avoiding the risk of local breakage caused by stress concentration. Secondly, the traditional positive electrode panel 0031 or negative electrode panel 0041 is a thin plate-like structure with a small bending section modulus, and is prone to bending and denting when subjected to the expansion force of the battery core 002. The convex hull structure 005 of this application transforms the positive electrode panel 0031 or negative electrode panel 0041 from a two-dimensional planar structure into a three-dimensional truss structure through the three-dimensional extension of the radial convex hull units 00511. The sidewall of each convex hull unit 00511 is equivalent to a reinforcing rib, which greatly increases the effective bending cross section of the positive electrode panel 0031 or negative electrode panel 0041. At the same time, the radially distributed convex hull units 00511 form a multi-directional force transmission path. The expansion force of the battery core 002 can be dispersed along the convex hull units 00511 to multiple directions such as the edge of the positive electrode panel 0031 or negative electrode panel 0041 and the central connection part 00513, so as to avoid the force being concentrated in a single area of ​​the positive electrode panel 0031 or negative electrode panel 0041, which would cause deformation. This improves the panel strength of the positive electrode panel 0031 and negative electrode panel 0041 from multiple angles.

[0025] Reference Figure 2 and Figure 3 As shown, a pure aluminum electrode post 0035 is fixed on the side of the positive electrode panel 0031 away from the battery core 002. The pure aluminum electrode post 0035 is used to conduct the positive current of the battery core 002. A copper-aluminum composite electrode post 0043 is fixed on the side of the negative electrode panel 0041 away from the battery core 002. The copper-aluminum composite electrode post 0043 is used to conduct the negative current of the battery core 002.

[0026] Reference Figure 5As shown, an isolation layer 007 is provided in the interlayer between the battery core 002 and the housing 001. The isolation layer 007 is provided between the positive electrode panel 0031 and the negative electrode panel 0041 of the battery core 002, and is used to separate the positive electrode panel 0031 and the negative electrode panel 0041 and allow ions in the electrolyte to pass through. The edge region of the insulating layer 007 extends to the interface between the battery core 002 and the negative electrode panel 0041.

[0027] Working principle: The casing 001 encapsulates the battery core 002, positive electrode assembly 003, and negative electrode assembly 004 into a single structure. Electrolyte is injected through the stepped injection holes 00311 on the positive electrode panel 0031, and a double seal is formed by sealing aluminum nails 0032 and O-ring sealant nails 0033, preventing leakage and adapting to temperature changes and vibrations. The positive electrode panel 0031 and negative electrode panel 0041 are equipped with integrally formed radial convex structures 005. The recessed storage grooves 0052 formed by these structures store excess electrolyte. The three-dimensional truss structure of the convex unit 00511 simultaneously disperses the expansion force of the battery core 002 during charging and discharging, preventing deformation of the positive electrode panel 0031 and negative electrode panel 0041. The electrolyte in the storage grooves 0052... The electrolyte is directionally conducted through the flow-guiding structure 006 to the connection surfaces of the positive electrode panel 0031 and the negative electrode panel 0041 with the battery core 002. With the help of the isolation layer 007 extending to the interface, the electrolyte is uniformly penetrated into the battery core 002. At the same time, the pure aluminum electrode post 0035 of the positive electrode panel 0031 and the copper-aluminum composite electrode post 0043 of the negative electrode panel 0041 respectively conduct the positive and negative currents of the battery core 002. The positive electrode insulating ring 0034 and the negative electrode insulating ring 0042 provide insulation and isolation at the pure aluminum electrode post 0035 and the penetration points of the positive electrode panel 0031, the copper-aluminum composite electrode post 0043 and the negative electrode panel 0041, and assist in preventing leakage, thus completing the functions of energy storage, dynamic management of electrolyte, safe sealing and stable current output.

[0028] Example 2

[0029] Reference Figure 6 As shown, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment, except that the flow guiding structure 006 includes a radially arranged circular array of liquid guiding strips 0061 and a plurality of concentric ring strips 0062 arranged outward along the ring. The liquid guiding strips 0061 extend radially along the positive electrode panel 0031 and the negative electrode panel 0041. The included angle between adjacent liquid guiding strips 0061 is equal, and one end of the liquid guiding strip 0061 is smoothly connected to the transition arc segment 00512 of the panel protrusion 0051, while the other end extends to the edge of the connection surface between the positive electrode panel 0031 or the negative electrode panel 0041 and the battery core 002.

[0030] Furthermore, the concentric ring bar 0062 consists of multiple annular protrusions arranged around the center of the panel. The height of the concentric ring bar 0062 is lower than that of the liquid guiding bar 0061. The concentric ring bar 0062 and the liquid guiding bar 0061 intersect to form a grid-like liquid blocking node. Both the concentric ring bar 0062 and the liquid guiding bar 0061 are protrusion structures integrally formed with the panel.

[0031] Reference Figures 1-6 As shown, a battery cell comprises a battery core 002 of a composite busbar, a positive electrode assembly 003, a negative electrode assembly 004, and a housing 001, which together constitute the main body of the battery cell's energy storage. Through the synergistic effect of the electrolyte storage groove 0052, the flow guiding structure 006, and the isolation layer 007 of the composite busbar, the storage and directional transmission of electrolyte and the stable isolation of the positive and negative electrode plates inside the battery cell are achieved, thereby ensuring the battery cell's energy output and cycle life.

[0032] Working principle: In Example 1, the radial convex structures 005 on the positive electrode panel 0031 and negative electrode panel 0041 not only store excess electrolyte through the liquid storage groove 0052, but also disperse the expansion force of the battery core 002 in a three-dimensional truss shape. The radial liquid guiding strips 0061 of the flow guiding structure 006 connect at one end to the transition arc segment 00512 of the convex structure and extend at the other end to the connection surface between the positive electrode panel 0031 and negative electrode panel 0041 and the battery core 002, allowing the electrolyte in the liquid storage groove 0052 to be radially and directionally conducted. The concentric rings 0062, whose height is lower than the liquid guiding strips 0061, intersect with the liquid guiding strips 0061 to form liquid-blocking nodes, which can temporarily accumulate the conducted electrolyte. Once the electrolyte has accumulated to a certain amount... The electrolyte then flows to the battery core 002. Simultaneously, the insulating layer 007, extending to the interface between the battery core 002 and the positive electrode panel 0031 and the negative electrode panel 0041, separates the positive and negative electrode plates of the battery core 002 and allows ions to pass through. In conjunction with the pure aluminum electrode post 0035 and the copper-aluminum composite electrode post 0043 to conduct current, and the positive electrode insulating ring 0034 and the negative electrode insulating ring 0042 to insulate the positive electrode plate and multiple negative electrode plates from the positive electrode panel 0031 and the negative electrode panel 0041, the electrolyte is then uniformly and orderly replenished to the core through the synergy of "liquid storage groove 0052 for liquid storage, optimized flow guiding structure 006 for directional liquid transfer and control, and insulating layer 007 for ion conduction". This ensures stable power output and long-term cycle life of the battery cell.

[0033] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite busbar, characterized in that: The device includes a housing (001), the inner cavity of which is fitted with a battery core (002). A positive electrode assembly (003) and a negative electrode assembly (004) are respectively fitted at both ends of the battery core (002). The positive electrode assembly (003) includes a positive electrode panel (0031) which is connected to the positive output end of the battery core (002). The negative electrode assembly (004) includes a negative electrode panel (0041) which is connected to the negative output end of the battery core (002). The positive electrode panel (0031) and the negative electrode panel (0041) are symmetrically designed with respect to the battery core (002). The negative electrode panel (0041) and the positive electrode panel (0031) are integrally formed with a convex structure (005) on the side facing the battery core (002). The convex structure (005) is recessed towards the battery core (002) to form a liquid storage groove (0052). The negative electrode panel (0041) and the positive electrode panel (0031) are provided with a flow guiding structure (006). One end of the flow guiding structure (006) is connected to the liquid storage groove (0052), and the other end extends to the connection surface between the negative electrode panel (0041) and the battery core (002).

2. The composite busbar as described in claim 1, characterized in that: The convex hull structure (005) is an integrated panel convex hull (0051) on the side of the negative electrode panel (0041) facing the battery core (002). The panel convex hull (0051) includes at least three convex hull units (00511) that are evenly distributed radially, a transition arc segment (00512) connecting adjacent convex hull units (00511), and a central connecting part (00513) located at the geometric center. The convex unit (00511) extends from the surface of the negative electrode panel (0041) toward the battery core (002), and the inner region of each convex unit (00511) is recessed away from the battery core (002) to form a liquid storage groove (0052) for storing electrolyte.

3. The composite busbar as described in claim 2, characterized in that: A pure aluminum electrode post (0035) is fixed on the side of the positive electrode panel (0031) away from the battery core (002), and the pure aluminum electrode post (0035) is used to conduct the positive current of the battery core (002); a copper-aluminum composite electrode post (0043) is fixed on the side of the negative electrode panel (0041) away from the battery core (002), and the copper-aluminum composite electrode post (0043) is used to conduct the negative current of the battery core (002).

4. The composite busbar as described in claim 3, characterized in that: An insulating layer (007) is provided between the battery core (002) and the housing (001), and the insulating layer (007) is provided between the positive electrode panel (0031) and the negative electrode panel (0041) of the battery core (002); The edge region of the insulating layer (007) extends to the interface between the battery core (002) and the negative electrode panel (0041).

5. The composite busbar as described in claim 4, characterized in that: The flow guiding structure (006) includes a radially arranged circular array of liquid guiding strips (0061) and a plurality of concentric rings (0062) arranged outward along the ring; the liquid guiding strips (0061) extend radially along the positive electrode panel (0031), the included angle between adjacent liquid guiding strips (0061) is equal, and one end of the liquid guiding strip (0061) is smoothly connected to the transition arc segment (00512) of the panel protrusion (0051), and the other end extends to the edge of the connection surface of the battery core (002) of the positive electrode panel (0031).

6. The composite busbar as described in claim 5, characterized in that... The concentric ring strip (0062) consists of multiple annular protrusions arranged around the center of the panel. The height of the concentric ring strip (0062) is lower than that of the liquid guiding strip (0061). The concentric ring strip (0062) and the liquid guiding strip (0061) intersect to form a grid-like liquid blocking node. Both the concentric ring strip (0062) and the liquid guiding strip (0061) are protrusion structures integrally formed with the panel.

7. A battery cell, characterized in that, The composite busbar as described in any one of claims 1-6, wherein the battery core (002), positive electrode assembly (003), negative electrode assembly (004) and housing (001) of the composite busbar together constitute the energy storage body of the battery cell.

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