Battery cell assembly and battery

Abstract

The utility model discloses a battery cell assembly and a battery. The battery cell assembly comprises a first pole piece, a first diaphragm, a plurality of second pole pieces and a second diaphragm, the first pole piece has a first wall surface and a second wall surface opposite to each other in the thickness direction. The first diaphragm is attached to the first wall surface, and the multiple second pole pieces are attached to the wall surface, deviating from the first pole piece, of the first diaphragm and are sequentially distributed at intervals in the length direction of the first diaphragm. The polarity of each second pole piece is different from that of the first pole piece. The second diaphragm can be attached to the second wall surface or the wall surface, deviating from the first diaphragm, of each second pole piece. And the first pole piece, the first diaphragm, the second pole pieces and the second diaphragm are integrally wound and formed, so that the charging efficiency of the battery cell assembly is improved. The battery cell assembly can be designed into a multi-tab form through the second pole pieces which are sequentially distributed at intervals, and the multi-tab parallel connection is realized, so that the battery disclosed by the utility model has higher charging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cell assembly and a battery. Background Technology

[0002] With the rapid development of consumer electronics, batteries, as a core component, directly impact user experience and market competitiveness. In particular, as mobile devices increasingly demand high energy density, fast charging, and long lifespan, the limitations of traditional battery designs are becoming increasingly apparent. For example, in conventional and centrally located spiral-wound battery designs, the single-tab design has become a significant technical bottleneck.

[0003] These types of batteries typically use a single current collector (i.e., a tab) to connect all the active material layers. While this design simplifies the manufacturing process and helps control costs, it exhibits significant shortcomings in practical applications. Particularly during high-current charging and discharging, the increased internal resistance caused by the single tab limits the charging rate and can potentially cause localized overheating, thus affecting battery safety and lifespan. Furthermore, the single tab design can lead to uneven current distribution, thereby accelerating the loss of active materials and shortening battery cycle life. Utility Model Content

[0004] The main purpose of this invention is to provide a cell assembly and battery that can simultaneously set multiple tabs to improve charging efficiency.

[0005] To achieve the above objectives, this utility model proposes a battery cell assembly, comprising:

[0006] The first electrode has a first wall surface and a second wall surface that are opposite to each other along the thickness direction;

[0007] The first diaphragm is attached to the first wall surface;

[0008] Multiple second electrodes are respectively attached to the wall surface of the first diaphragm away from the first electrode, and the second electrodes are distributed sequentially at intervals along the length of the first diaphragm, and the polarity of each second electrode is different from that of the first electrode.

[0009] The second diaphragm is attached to the second wall surface or to the wall surface of each second electrode that is away from the first diaphragm.

[0010] The first electrode, the first diaphragm, each of the second electrodes, and the second diaphragm are integrally wound together.

[0011] In some embodiments, the first electrode is an anode electrode, and each of the second electrodes is a cathode electrode.

[0012] In some embodiments, each second electrode is connected to at least one first electrode tab.

[0013] In some embodiments, the first electrode is connected to a second electrode tab.

[0014] In some embodiments, at least one second electrode is provided on each side of the second electrode tab along the extending direction of the first electrode.

[0015] In some embodiments, the cell assembly has a flat section, a first curved section, and a second curved section, the first curved section and the second curved section being connected to opposite sides of the flat section, the flat section including each second electrode.

[0016] In some embodiments, along the extending direction of the first electrode, there is a bend between each of two adjacent second electrodes.

[0017] In some embodiments, each of the second electrodes is arranged at intervals along the thickness direction of the straight section.

[0018] In some embodiments, the second electrodes are of the same size.

[0019] The second aspect of this application provides a battery including a cell assembly of any of the foregoing embodiments, the battery further including a housing, the cell assembly being disposed within the housing.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This application provides a battery cell assembly including a first electrode, a first separator, a plurality of second electrodes, and a second separator. The first electrode has a first wall surface and a second wall surface that are opposite to each other along its thickness direction. The first separator is attached to the first wall surface, and the plurality of second electrodes are respectively attached to the wall surface of the first separator facing away from the first electrode, and are distributed sequentially at intervals along the length direction of the first separator. The polarities of each second electrode are opposite to those of the first electrode. The second separator can be attached to the second wall surface or each second electrode can face away from the wall surface of the first separator. The first electrode, the first separator, each second electrode, and the second separator are integrally wound, and this design improves the charging efficiency of the battery cell assembly.

[0022] Specifically, on the one hand, the battery cell assembly of this application can achieve parallel connection of multiple tabs through the second electrode plates distributed in sequence at intervals, so the battery of this application has higher charging efficiency; on the other hand, the tight bonding and integrated winding of the first electrode plate, the first separator, the second electrode plate and the second separator shortens the electrochemical reaction path inside the battery cell assembly, thereby improving the charging efficiency of the battery cell assembly. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the first electrode in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the first electrode sheet and the first diaphragm in one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure in which the first electrode, the first diaphragm, and the second electrode cooperate with each other in one embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure in which the first electrode, the first diaphragm, and the second electrode cooperate with each other in another embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the battery cell assembly in one embodiment of the present invention.

[0029] Explanation of icon numbers:

[0030] First electrode 100;

[0031] Second electrode 200;

[0032] First diaphragm 300;

[0033] Second diaphragm 400;

[0034] First Pole Ear 500.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Reference Figures 1 to 3In some embodiments, this application provides a battery cell assembly including a first electrode 100, a first separator 300, a plurality of second electrodes 200, and a second separator 400. The first electrode 100 has a first wall surface and a second wall surface opposite to each other along its thickness direction. The first separator 300 is attached to the first wall surface, and the plurality of second electrodes 200 are respectively attached to the wall surface of the first separator 300 facing away from the first electrode 100, and are distributed sequentially at intervals along the length direction of the first separator 300. Each second electrode 200 has a different polarity than the first electrode 100. The second separator 400 may be attached to the second wall surface or each second electrode 200 may face away from the wall surface of the first separator 300. The first electrode 100, the first separator 300, each second electrode 200, and the second separator 400 are integrally wound, a design that improves the charging efficiency of the battery cell assembly. Specifically, on the one hand, the battery cell assembly of this application can realize the parallel connection of multiple tabs through the sequentially spaced second electrode plates 200, such as the parallel connection of multiple anode tabs, so the battery of this application has higher charging efficiency; on the other hand, the tight bonding and integrated winding of the first electrode plate 100, the first separator 300, the second electrode plate 200 and the second separator 400 shortens the electrochemical reaction path inside the battery cell assembly, thereby improving the charging efficiency of the battery cell assembly.

[0038] Understandably, the close fit between the first electrode 100 and the second electrode 200 reduces the distance ions migrate and increases the effective area for electron conduction, thereby improving charging efficiency. Furthermore, the alternating arrangement of the first electrode 100 and the second electrode 200, along with the bonding method of the second separator 400, ensures the structural stability and consistency of the cell assembly during winding, helping to prevent electrode misalignment or separator damage during subsequent use, further guaranteeing the safety and reliability of the cell assembly. In practical applications, this design can also effectively reduce the internal resistance of the cell assembly, thereby increasing the overall energy density. Moreover, the multi-layered second electrode 200 not only increases the cell capacity but also ensures uniform current distribution due to their uniform spacing, thus improving charging efficiency.

[0039] It is understandable that the first electrode 100 can be either a cathode or an anode, and the second electrode 200 can also be either a cathode or an anode. When the first electrode 100 is a cathode, the second electrode 200 is an anode, and vice versa. For battery charging, the second electrode 200 is typically designed as a cathode, with multiple cathodes spaced apart on the separator.

[0040] It is understandable that by setting multiple spaced first electrode plates 100 or second electrode plates 200, the number of tabs connected to them can be increased, thereby making the charging efficiency of the battery cell assembly of this application higher.

[0041] It is understood that in some embodiments, the bonding between the first electrode 100 and the first diaphragm 300 and the second electrode 200 is achieved through a high-precision coating process, which ensures uniform coverage of the electrode surface and avoids the risk of short circuits caused by local over-thickness or under-thickness.

[0042] Understandably, in some embodiments, to ensure good contact between the first electrode 100 and the second electrode 200, both the first diaphragm 300 and the second diaphragm 400 are made of high-insulation materials to prevent short circuits. Furthermore, the dual protection of the first diaphragm 300 and the second diaphragm 400 ensures the cell's safety and stability even under extreme conditions. The spaced distribution of multiple second electrodes 200 ensures uniform electrolyte distribution, further improving charging efficiency. In addition, the integrated winding design simplifies the manufacturing process and reduces defects that may be introduced during assembly.

[0043] Reference Figure 3 and Figure 4 In some embodiments, the first electrode 100 is an anode electrode, and each of the second electrodes 200 is a cathode electrode. The advantage of this configuration is that a potential difference is formed between the anode and cathode electrodes. When the external circuit is closed, electrons flow from the anode to the cathode, generating current and thus achieving energy conversion. The provision of multiple cathode tabs improves the charging efficiency of the battery cell assembly. Specifically, the anode electrode serves as the first electrode 100, and the cathode electrode serves as the second electrode 200, with opposite polarities. When the battery cell assembly is charging and discharging, lithium ions can move effectively between the anode and cathode. The alternating arrangement of the anode and cathode electrodes ensures an efficient migration path for lithium ions, improving the charging and discharging efficiency of the battery cell assembly. Simultaneously, the selection of materials for the anode and cathode electrodes, such as using carbon-based materials for the anode and transition metal oxides for the cathode, can significantly improve energy density and reduce internal resistance, thereby improving the overall performance of the battery cell assembly.

[0044] Understandably, in some embodiments, the selection of the anode and cathode electrodes depends not only on their electrochemical properties but also on factors such as material cost and environmental friendliness. Optimizing the material ratio of the anode and cathode electrodes can further improve the energy density and cycle life of the battery cell assembly. Furthermore, the distance and contact area between the anode and cathode electrodes also significantly impact the performance of the battery cell assembly. A reasonable spacing design not only ensures efficient lithium-ion migration but also avoids the risk of short circuits caused by electrodes being too close together. In this way, the battery cell assembly can achieve efficient charging and maintain a long service life.

[0045] Understandably, in some embodiments, the anode electrode is typically made of materials such as lithium metal or lithium alloys, which have high electronic conductivity and low lithium intercalation potential. The cathode electrode is made of lithium-ion intercalation-capable transition metal oxides or other suitable materials, enabling efficient storage and release of lithium ions. The alternating arrangement of the anode and cathode electrodes allows lithium ions to move smoothly between the two electrodes during charging and discharging, thereby increasing the energy density of the cell. Furthermore, by selecting appropriate materials and structural designs, the internal resistance of the cell can be effectively reduced, improving its cycle life.

[0046] Reference Figure 4 and Figure 5 In some embodiments, the cell assembly includes a first electrode 100, a first separator 300, a plurality of second electrodes 200, and a second separator 400, wherein each second electrode 200 is connected to at least one first tab 500. This structural design helps improve the current harvesting efficiency of the cell assembly, thereby improving overall battery performance. The second electrodes 200 are connected to external circuitry via the first tabs 500, ensuring that current can be efficiently transferred from the second electrodes 200 to the external load. Furthermore, the placement of the first tabs 500 also helps improve the thermal stability of the battery, as they can be designed to have good thermal conductivity, thus aiding in heat dissipation.

[0047] It is understood that in some embodiments, the first tab 500 may be made of metal foil or other materials with good conductivity, used to draw current from the second electrode 200. The connection between the first tab 500 and the second electrode 200 can be achieved by welding, crimping, or other methods to ensure a firm and reliable connection. A good connection between the first tab 500 and the second electrode 200 not only improves the working efficiency of the battery cell assembly but also extends its service life.

[0048] Understandably, in some embodiments, to ensure a stable connection between the first tab 500 and the second electrode 200 over a long period without loosening, the mechanical strength of the first tab 500 can be enhanced by increasing its width or thickness. Furthermore, the surface of the first tab 500 can be nickel-plated or subjected to other surface treatments to improve its conductivity and corrosion resistance. By optimizing the material and structure of the first tab 500, the internal resistance of the battery cell assembly can be further reduced, improving its overall electrical performance. Additionally, considering the position and arrangement of the first tab 500 within the battery cell assembly, it can be designed with a certain curvature to avoid interference with other components, thereby ensuring effective utilization of the internal space of the battery cell assembly.

[0049] Furthermore, the number and arrangement of the first tabs 500 can be adjusted according to actual needs to adapt to different application scenarios and ensure optimal current transmission. For example, by setting multiple first tabs 500, current density can be distributed, localized heat generation can be reduced, and battery life can be extended. Additionally, the position and number of the first tabs 500 can be adjusted according to actual requirements to adapt to different application scenarios.

[0050] Reference Figure 3 and Figure 5 In some embodiments, the battery cell assembly provided in this application includes a first electrode 100, a first separator 300, a plurality of second electrodes 200, and a second separator 400, wherein the first electrode 100 is connected to a second tab. This design facilitates the efficient transfer of current from the first electrode 100 to the external circuit, while also simplifying the internal structure of the battery and improving assembly efficiency. The presence of the second tab not only facilitates current output but also ensures a good electrical connection between the first electrode 100 and the external circuit, thereby enhancing the overall performance of the battery.

[0051] Understandably, in some embodiments, to ensure a good electrical connection between the second tab and the first electrode 100, the second tab may be made of multilayer composite material to improve its conductivity and mechanical strength. Furthermore, the width and thickness of the second tab can be adjusted according to the specific design requirements of the battery cell assembly to meet the needs of current transmission. In terms of the connection process, advanced technologies such as ultrasonic welding can be used to ensure a robust connection between the second tab and the first electrode 100. Through these optimization measures, the second tab not only enhances the conductivity of the battery cell assembly but also improves its overall reliability and service life.

[0052] Reference Figure 3 and Figure 5 In some embodiments, the first electrode 100 is connected to a second electrode tab, and at least one second electrode 200 is provided on each side of the second electrode tab along the extending direction of the first electrode 100. This structural design ensures that the effective area of ​​the cell assembly is maximized within a limited space, thereby improving the battery capacity and energy density. Specifically, the alternating distribution between the first electrode 100 and the second electrode 200 ensures efficient migration of lithium ions during charging and discharging. As a key component connecting the first electrode 100 to the external circuit, the position and design of the second electrode tab are crucial. By placing the second electrode tab at the center of the first electrode 100 and providing second electrodes 200 on both sides, not only is the uniformity of current transmission ensured, but the risk of localized heat generation is also reduced. In addition, the choice of material for the second electrode tab also has a significant impact on the performance of the cell assembly. Generally, materials with good conductivity, such as copper foil, are chosen to reduce internal resistance.

[0053] Understandably, by placing the second electrode plates 200 on both sides of the second electrode tab, the current can be evenly distributed on the first electrode plate 100, reducing the risk of localized overheating. This arrangement also helps improve the battery's charging and discharging efficiency. Furthermore, by adjusting the position of the second electrode tab and the number of second electrode plates 200, the current distribution can be optimized, improving the overall performance of the battery. In addition, the design of having second electrode plates 200 on both sides of the second electrode tab helps improve the battery's thermal management and safety, because during charging and discharging, the current can be distributed more evenly, reducing the risk of localized overheating.

[0054] Reference Figure 5 In some embodiments, the battery cell assembly of this application has a flat section, a first curved section, and a second curved section, with the first and second curved sections respectively connected to opposite sides of the flat section. The flat section includes each second electrode 200. This structural design makes the battery cell assembly more compact during winding, which helps to improve the energy density of the battery cell assembly. By placing the second electrode 200 on the flat section and providing curved sections at both ends of the flat section, the waste of internal space of the battery cell assembly can be effectively reduced, allowing the battery cell assembly to accommodate more active material in a limited space, thereby improving its energy storage capacity.

[0055] Specifically, the second electrode 200 is sequentially distributed along the straight section and separated from the first electrode 100 by the first separator 300. The second separator 400 is attached to the side of the second electrode 200 away from the first electrode 100, or directly attached to the second wall surface of the first electrode 100. The straight section design allows the second electrode 200 to be neatly arranged, while the first and second curved sections are used to connect the two ends of the straight section, forming a closed structure. This design not only facilitates the compact packaging of the battery cell assembly but also ensures the stability of the battery cell assembly during charging and discharging.

[0056] By designing the battery cell assembly with both straight and curved sections, the internal space of the battery casing can be effectively utilized, increasing the effective area of ​​the cells and thus improving the battery's energy density. The straight sections help maintain the neat arrangement of the cell assembly within the casing, reducing the risk of damage caused by compression. Simultaneously, the curved sections allow the cell assembly to better adapt to changes in the shape of the battery casing, especially in non-rectangular casings, enabling a more compact filling of space and reducing wasted space, thereby improving the overall utilization rate of the battery. Furthermore, this structure also helps improve the battery's thermal management performance, as the curved sections act as a buffer, reducing damage caused by external impacts during use.

[0057] Understandably, in some embodiments, to ensure the structural stability and reliability of the battery cell assembly, the design of the first and second bending sections needs to consider the stress distribution of the battery cell assembly during actual use. By optimizing the geometry and material of the bending sections, stress can be effectively dispersed, preventing deformation of the battery cell assembly during long-term use. Furthermore, by controlling the spacing of the second electrode 200 on the straight section, the internal structure of the battery cell assembly can be further optimized, improving its electrochemical performance. In practical applications, the connection method between the straight and bending sections also requires special attention to ensure the overall strength and sealing of the battery cell assembly.

[0058] Reference Figure 5 In some embodiments, a curved section is spaced between each pair of adjacent second electrodes 200 along the extending direction of the first electrode 100. This design allows the cell assembly to form a compact three-dimensional structure after winding, thereby accommodating more electrodes in the same volume, increasing the effective area of ​​the cell, and improving the energy density of the battery. Specifically, the first electrode 100, the first separator 300, the second electrode 200, and the second separator 400 are integrally wound to form a structure with straight and curved sections. The distribution of the second electrode 200 on the straight sections ensures uniform distribution of active materials inside the cell assembly, thereby improving the energy density and charging efficiency of the cell assembly. The presence of the curved sections allows the cell assembly to better adapt to the shape of the battery casing during winding, reducing internal space waste and improving the packaging density of the cell assembly.

[0059] Understandably, the spaced bends between adjacent second electrode plates 200 ensure that the electrode plates and separator fit tightly together during the winding process, reducing gaps and improving space utilization. Simultaneously, this spacing also helps enhance the mechanical strength of the cell assembly, making it less prone to deformation or damage under external forces. Furthermore, by controlling the angle and shape of the bends, the internal structure of the cell assembly can be optimized, reducing internal stress and thus improving its stability and reliability.

[0060] Understandably, in some embodiments, the design of the bending section needs to consider the mechanical strength and electrical performance of the battery cell assembly during use. To ensure the structural stability of the battery cell assembly, the bending section needs sufficient flexibility to accommodate deformation during the winding process, while also possessing sufficient rigidity to maintain the overall structure of the battery cell assembly. Furthermore, the design of the bending section should also consider the volume changes of the battery cell assembly due to thermal expansion and contraction during charging and discharging, preventing internal stress during use that could damage the battery cell assembly. By optimizing the design of the bending section, the reliability and lifespan of the battery cell assembly can be further improved.

[0061] Reference Figure 3 and Figure 4 In some embodiments, the second electrode sheets 200 are spaced apart along the thickness direction of the straight section. This arrangement allows the second electrode sheets 200 to be uniformly distributed within a limited space, thereby improving the uniformity of the battery, ensuring uniform current flow throughout the entire cell assembly, and reducing the formation of local hot spots. Specifically, the second electrode sheets 200 are spaced apart along the thickness direction of the straight section, ensuring that the distance between each second electrode sheet 200 and the first electrode sheet 100 is consistent, thus guaranteeing uniform current distribution within the cell assembly and reducing the risk of localized heating. This design not only improves the energy density of the cell assembly but also enhances its stability. Furthermore, by optimizing the spacing of the second electrode sheets 200, the internal resistance of the cell assembly can be further reduced, improving its overall electrochemical performance.

[0062] Understandably, by arranging the second electrode plates 200 at intervals along the thickness direction of the straight section, the current distribution inside the cell assembly can be made more uniform, reducing localized overheating caused by current concentration. Simultaneously, this uniform distribution design also helps improve the battery's cycle performance, as uniform current distribution reduces uneven consumption of active materials, extending battery life. Furthermore, by adjusting the spacing between the second electrode plates 200, the battery's internal resistance characteristics can be optimized, improving the battery's charge and discharge efficiency.

[0063] It is understood that in some embodiments, to ensure the effect of the second electrode 200 being spaced apart along the thickness direction of the straight section, precise control of the size and arrangement of the second electrode 200 is required. This includes, but is not limited to, using precision machining techniques to ensure the dimensional consistency of the second electrode 200, and employing automated equipment to achieve the precise arrangement of the second electrode 200. Furthermore, the degree of adhesion between the second electrode 200 and the first electrode 100 also has a significant impact on the performance of the battery cell assembly. By improving the adhesion quality between the second electrode 200 and the first electrode 100, the electrochemical reaction rate of the battery cell assembly can be increased, thereby improving its charging efficiency. Through these optimization measures, the design of the second electrode 200 being spaced apart along the thickness direction of the straight section not only improves the electrical performance of the battery cell assembly but also enhances its reliability and lifespan.

[0064] Reference Figure 3 and Figure 4 In some embodiments, each of the second electrode plates 200 is the same size. This design ensures that all the second electrode plates 200 occupy the same area in the cell assembly, which helps to ensure uniform current distribution and thus improves the charging efficiency of the cell assembly.

[0065] In some embodiments, the second electrodes 200 of the same size can be fabricated using a precise coating process to ensure uniform distribution of active material on each electrode, thereby guaranteeing the stability and efficiency of the battery cell assembly during charging and discharging. By optimizing the size and material of the second electrodes 200, the battery cell assembly can achieve higher energy density and longer cycle life. Furthermore, the uniform size of the second electrodes 200 also helps reduce the internal resistance of the battery cell assembly, improving its overall electrochemical performance.

[0066] Understandably, to ensure that all second electrode sheets 200 are of consistent size, strict control of process parameters such as coating thickness and drying temperature is necessary during production to guarantee the quality of each electrode sheet. Furthermore, high-precision cutting equipment is required for the cutting of the second electrode sheets 200 to ensure the flatness of the electrode edges and the consistency of dimensions. These measures not only improve the performance of the battery cell assembly but also enhance its safety and reliability during use. Simultaneously, consistent second electrode sheet 200 sizes facilitate subsequent assembly processes, simplifying the battery manufacturing process and reducing costs. By ensuring that all second electrode sheets 200 are of the same size, the electrochemical reaction within the battery cell assembly can be ensured to proceed uniformly, avoiding uneven current distribution caused by differences in electrode size. In addition, a uniform second electrode sheet 200 size also helps simplify the manufacturing process, reduce material waste, and improve production efficiency. Furthermore, identical second electrode sheets 200 sizes ensure stable battery performance during use, extending battery life. By controlling the consistency of the second electrode sheet 200 dimensions, better thermal management and uniform charge distribution can be achieved, thereby improving the overall performance of the battery.

[0067] Reference Figures 1 to 5 In some embodiments, embodiments of the second aspect of this application provide a battery including the cell assembly of any of the foregoing embodiments. The battery also includes a housing, within which the cell assembly is disposed. This structural design not only protects the cell assembly from external environmental influences but also improves the overall mechanical strength of the battery, facilitating its installation and use. The battery of this application, through sequentially spaced second electrode plates 200, enables multiple tabs to be connected in parallel, thus resulting in higher charging efficiency.

[0068] In some embodiments, the battery cell assembly is housed within a specially designed housing capable of withstanding pressure to prevent damage to the cell assembly in case of accidental events. The housing is typically made of high-strength metal or plastic materials with good corrosion resistance and temperature resistance. Optimizing the housing design can improve the overall performance of the battery, such as reducing its size and weight, making it more suitable for use in portable devices. Furthermore, the housing must possess good insulation properties to prevent short circuits between the battery cell assembly and external objects.

[0069] Understandably, in some embodiments, the casing design needs to comprehensively consider factors such as the battery's operating environment, safety, and convenience. For example, batteries used in high-temperature or humid environments require casings with stronger protective capabilities; while batteries used in mobile devices require thin and compact casings. By selecting casing materials, designing the structure, and optimizing the manufacturing process, the overall performance of the battery can be further improved. Furthermore, the casing may also house sensors, control circuits, and other components to monitor the battery's status and control its operating mode. Through these designs, the battery not only possesses high-performance cell components but also enjoys good safety and convenience.

[0070] The following further describes the scheme of this application. Regarding the preparation of the battery cell assembly and battery of this application, please refer to... Figures 1 to 3 Taking Al electrode center placement as an example, firstly, the anode electrode is placed in the center, then a diaphragm is covered on the cathode, and finally, several cathode sheets produced are laid on the diaphragm at a certain distance, thermally bonded and then wound. In this way, a bare cell with a single anode electrode and multiple cathode electrodes is produced by winding and stacking.

[0071] Furthermore, referring to Figure 4 Specifically, taking 5 cathode electrodes as an example, the cathode electrode width is L, the anode + diaphragm thickness is h1, and the anode + diaphragm + cathode electrode thickness is h2. Therefore, when the cathode electrodes are laid flat, the distance between the two electrodes is: (considering the misalignment of the cathode tabs during winding).

[0072] d1=L+h1,

[0073] d2 = L + h1 + h2 + h2 + h1,

[0074] d3 = L + h1 + h2 + h2 + h1 + h2 + h1,

[0075] d4=L+h1+h2+h2+h1+h2+h1+h2+h1.

[0076] (The AC-Overhang size of the anode and cathode is 0.3 to 3.0. The cathode also needs to be coated with CCL, and the CCL size is -0.6 to 0.3.)

[0077] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. When a directional reference is introduced in a specific embodiment, unless the direction is specifically limited to unidirectional, the direction can be unidirectional or bidirectional (two parallel and opposite directions). Whether it is unidirectional or bidirectional depends on what those skilled in the art can achieve. When the directional reference is bidirectional, it should be considered that two parallel and different embodiments have been introduced simultaneously.

[0078] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0079] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery cell assembly, characterized in that, include: The first electrode has a first wall surface and a second wall surface that are opposite to each other along the thickness direction; The first diaphragm is attached to the first wall surface; Multiple second electrodes are respectively attached to the wall surface of the first diaphragm away from the first electrode, and each second electrode is distributed sequentially at intervals along the length direction of the first diaphragm, and each second electrode has a polarity different from that of the first electrode. The second diaphragm is attached to the second wall surface or to the wall surface of each second electrode sheet that is away from the first diaphragm. The first electrode, the first diaphragm, each of the second electrodes, and the second diaphragm are integrally wound together.

2. The cell assembly as described in claim 1, characterized in that, The first electrode is an anode electrode, and each of the second electrodes is a cathode electrode.

3. The cell assembly as described in claim 1, characterized in that, Each of the second pole pieces is connected to at least one first pole piece.

4. The cell assembly as described in claim 1, characterized in that, The first electrode is connected to a second electrode tab.

5. The cell assembly as described in claim 4, characterized in that, Along the extending direction of the first electrode, there is at least one second electrode on each side of the second electrode tab.

6. The cell assembly as described in claim 1, characterized in that, The battery cell assembly has a flat section, a first curved section and a second curved section, the first curved section and the second curved section being respectively connected to opposite sides of the flat section, and the flat section including each of the second electrode plates.

7. The cell assembly as described in claim 6, characterized in that, Along the extending direction of the first electrode, there is a bend between each two adjacent second electrodes.

8. The cell assembly as described in claim 6, characterized in that, Each of the second electrodes is arranged at intervals along the thickness direction of the straight section.

9. The cell assembly as claimed in claim 1, characterized in that, Each of the second electrodes is the same size.

10. A battery, characterized in that, The battery includes the cell assembly according to any one of claims 1-9, and the battery further includes a housing, wherein the cell assembly is disposed within the housing.

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