Battery cell, battery apparatus, and electric device

Abstract

The present application relates to the technical field of batteries. Disclosed are a battery cell, a battery apparatus, and an electric device. The battery cell comprises a casing, an electrode assembly, a first tab, and a first adhesive tape, wherein the electrode assembly is configured as a stacked cell, which comprises positive electrode plates, negative electrode plates, and separators. A plurality of positive electrode plates and a plurality of negative electrode plates are provided, which are sequentially stacked in the direction of thickness of the electrode assembly, and the separators are arranged between adjacent positive and negative electrode plates and on the outer side of the outermost positive electrode plate and / or negative electrode plate in the direction of thickness of the electrode assembly. The electrode assembly has a first side surface and a second side surface opposite each other in the direction of width. At least one first adhesive tape is provided, which is bonded to the first side surface. The total length of the first adhesive tape is defined as D1, and in the direction of width of the electrode assembly, the dimension by which one end of the separator extends beyond the end of the negative electrode plate on the same side is defined as h, satisfying: 15 mm2≤h*D1≤1800 mm2. The battery cell of the present application improves the reliability of batteries.

Description

Battery cells, battery devices and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202520311206.X, filed on February 26, 2025, entitled “Battery Cell, Battery Device and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, battery device and electrical equipment. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] Battery reliability is a crucial issue during battery use, and improving battery reliability is a technical problem that needs to be solved today.

[0005] Utility Model Content

[0006] This application provides a battery cell, a battery device, and an electrical appliance, wherein the reliability of the battery cell is improved.

[0007] To achieve the above objectives, the main technical solutions adopted in this application include:

[0008] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a first tab, and a first adhesive tape: the casing has a receiving cavity; the electrode assembly is disposed within the receiving cavity, and the electrode assembly is configured as a stacked cell, the stacked cell including a positive electrode sheet, a negative electrode sheet, and a separator, wherein there are multiple positive and negative electrode sheets stacked sequentially along the thickness direction of the electrode assembly, and a separator is disposed between adjacent positive and negative electrode sheets, and on the outermost positive and / or negative electrode sheets along the thickness direction of the electrode assembly; the thickness direction overlaps with the positive and negative electrode sheets. The directions of the electrodes are parallel; the first tab is disposed at one end of the electrode assembly in the length direction; wherein, the electrode assembly has a first side and a second side opposite to each other in the width direction, the length direction, thickness direction and width direction of the electrode assembly are perpendicular to each other, at least one first tape is provided, the first tape is adhered to the first side, the total length of the first tape along the length direction of the electrode assembly is D1, and the dimension by which one end of the diaphragm extends beyond the same side end of the negative electrode sheet along the width direction of the electrode assembly is h, satisfying: 15mm2≤h*D1≤1800mm2.

[0009] The battery cell proposed in this application has a separator between adjacent positive and negative electrode plates, as well as on the outermost positive and / or negative electrode plates along the thickness direction of the electrode assembly. This effectively isolates the positive and negative electrodes, reducing the probability of short circuits inside the battery. After the cells are stacked, multiple electrode plates and separators are in a loose state. The first adhesive tape on the side can bind the stacked positive, negative, and separator plates together, reducing the looseness of the electrode assembly and thus reducing the local lithium-ion transport impedance, which is beneficial to lithium-ion transport. By controlling the sum of the dimensions of the first adhesive tape and the dimension of one end of the separator extending beyond the same side of the negative electrode plate to meet the above range, the first adhesive tape is used to bind the electrode assembly, which is beneficial to lithium-ion transport during subsequent charging and discharging. On the one hand, avoid using tape that is too narrow and avoid having the separator facing the negative electrode too small. This reduces the probability of the separator folding during tape fixing, thereby reducing the chance of a short circuit caused by the separator folding. At the same time, it ensures that the tape has sufficient binding force on the electrode assembly. On the other hand, avoid using tape that is too wide and having the separator facing the negative electrode too large. This reduces the probability of positional misalignment during tape bonding, reduces the pulling force of the tape on the separator, and reduces the risk of the separator folding due to the tape being too narrow, thereby improving the reliability of the battery.

[0010] Secondly, embodiments of this application provide a battery device, including a battery cell as described in the above embodiments.

[0011] Thirdly, embodiments of this application provide an electrical device including the battery device described in the above embodiments. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 is a schematic diagram of the overall structure in an embodiment of this application;

[0014] Figure 2 is a schematic diagram of the overall structure of the electrode assembly in an embodiment of this application;

[0015] Figure 3 is an enlarged structural schematic diagram of one end of the electrode assembly in an embodiment of this application;

[0016] Figure 4 is a front view of one end of the electrode assembly in an embodiment of this application;

[0017] Figure 5 is a partially enlarged structural diagram of Figure 4;

[0018] Figure 6 is a schematic diagram of another enlarged part of the structure in Figure 4;

[0019] Figure 7 is a top view of the electrode assembly in an embodiment of this application;

[0020] Figure 8 is a front view of one end of the electrode assembly in an embodiment of this application;

[0021] Figure 9 is a front sectional view of the electrode assembly in an embodiment of this application.

[0022]

Explanation of reference numerals

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0025] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0029] As an example, a battery cell includes a cell formed by using positive and negative electrode plates as electrochemical material carriers, separating the positive and negative electrode plates through a separator to prevent short circuits, using an electrolyte as an ion transport carrier, providing structural protection through a casing, and connecting to an external circuit through terminals.

[0030] In some embodiments, the positive electrode sheet includes a positive current collector having a plurality of surfaces, wherein at least one surface is provided with a positive active material.

[0031] As an example, the positive electrode active material is located on the surface of the positive electrode current collector along its own thickness direction.

[0032] As an example, the positive electrode current collector can be a metal foil or a composite current collector. When the positive electrode current collector includes a metal foil, it can be at least one of the following: silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. When the positive electrode current collector includes a composite current collector, the composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0033] As an example, positive electrode active materials include, but are not limited to, the following materials: lithium phosphates, lithium transition metal oxides and their respective modified compounds, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0034] In some embodiments, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material. The negative electrode current collector may be a metal foil or a composite current collector. When the negative electrode current collector includes a metal foil, it may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or at least one of carbon, nickel, or titanium.

[0035] As an example, the negative electrode active material is disposed on the surface of the negative electrode current collector along its thickness direction.

[0036] As examples, negative electrode active materials include, but are not limited to, the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, and may also employ other conventional materials known in the art that can be used as battery negative electrode active materials. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys, but this application is not limited to these materials. These negative electrode active materials may be used alone or in combination of two or more.

[0037] In some embodiments, the diaphragm can be any known porous diaphragm with good chemical and mechanical stability.

[0038] As an example, the main materials of the diaphragm include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The diaphragm can be a single-layer film or a multi-layer composite film, without particular limitation.

[0039] When the separator is a multilayer composite film, the materials of each layer can be the same or different, without particular restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0040] In some embodiments, the positive electrode, negative electrode, and separator form a stacked structure. A stacked structure refers to the stacking of individual sheet-like positive electrode, negative electrode, and separator structures; the positive and negative electrode sheets are discontinuous, and adjacent layers are discontinuous; additionally, in this application, the separator can also be a single sheet, discontinuous; in another embodiment, the separator can be continuous, while the positive and negative electrode sheets are discontinuous, thereby forming a Z-shaped stacked structure.

[0041] In some embodiments, the housing includes at least one of a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film. The housing can encapsulate components such as the positive electrode, the negative electrode, and the separator.

[0042] In some embodiments, the housing includes an end cap and a casing. The casing has an opening, and the end cap closes the opening to form a sealed space for accommodating electrode components and electrolytes. The casing may have one or more openings. One or more end caps may also be provided. The end caps may also be used to house other battery structural components, such as electrode terminals, pressure relief mechanisms, and electrolyte filling holes; this application does not limit the scope of these components.

[0043] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tabs of the electrode assembly. The electrode terminal can serve as a circuit transmission terminal, and can subsequently be connected to a busbar or other means to achieve electrical connection between multiple battery cells. The electrode terminal can be located on the end cap or on the housing.

[0044] Batteries still face some challenges in practical applications, among which membrane wrinkling is a relatively common problem. Membrane wrinkling not only affects the performance and safety of the battery, but may also lead to serious consequences such as short circuits and thermal runaway.

[0045] In laminated cells, multiple electrode sheets are stacked. Compared to conventional cells that are covered by a separator, the cells are less constrained. The sides of the cells need to be fixed with tape. When fixing with tape, the separator is prone to wrinkling because it is in a multi-layered and dispersed state. After the separator wrinkles and folds, electrode sheets may fall out, resulting in uneven distribution of internal resistance in the battery. Areas with low internal resistance may be overcharged or over-discharged during battery cycling, which will affect the consistency and cycle performance of the battery. In severe cases, it may cause serious consequences such as battery short circuit and thermal runaway. At the same time, after the separator wrinkles and folds, it may also cause direct contact between the positive and negative electrodes, resulting in a short circuit.

[0046] In view of this, in order to improve the reliability of the battery, this application provides a battery cell. Please refer to Figures 1, 2, 3 and 9. The battery cell includes a housing 100, an electrode assembly 200, a first tab 500 and a first adhesive tape 300.

[0047] The housing 100 has a receiving cavity 101 in which the electrode assembly 200 is disposed. It is understood that the housing 100 can provide structural protection for the electrode assembly 200 in the receiving cavity 101, which helps to improve the reliability of the battery.

[0048] The electrode assembly 200 is configured as a stacked cell 201, which includes a positive electrode 210, a negative electrode 220, and a separator 230. There are multiple positive electrode 210 and negative electrode 220, which are stacked sequentially along the thickness direction Z of the electrode assembly 200. It can be understood that "stacked sequentially" means that one positive electrode, one negative electrode, another positive electrode, and another negative electrode are arranged alternately along the thickness direction of the electrode assembly 200. There is no limit to the number of positive electrode and negative electrode stacked. By stacking multiple positive electrode 210 and negative electrode 220, it is helpful to improve the energy density of the battery.

[0049] As an example, the laminated cell 201 refers to multiple independent sheet-like positive electrode plates 210 and negative electrode plates 220 stacked together, and each positive electrode plate 210 and negative electrode plate 220 is independent of each other.

[0050] A separator 230 is provided between adjacent positive electrode plates 210 and negative electrode plates 220, as well as on the outermost positive electrode plate 210 and / or negative electrode plate 220 along the thickness direction Z of the electrode assembly 200. It can be understood that the separator 230, as an electronic insulator, effectively prevents the risk of internal short circuit in the battery when the battery is working normally.

[0051] The first tab 500 is disposed at one end of the electrode assembly 200 in the length direction X. The first tab 500 can transmit the internal current of the battery cell and be electrically connected to the corresponding electrode terminal. The material of the first tab 500 can be the same as the current collector material. Specifically, it can be at least one of aluminum with silver plating, stainless steel with silver plating, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium.

[0052] As an example, the material of the first tape 300 can be a polyimide film (PI film), an acrylic imide film (PPA film), or a polyethylene film.

[0053] The electrode assembly 200 has a first side 201 and a second side 202 opposite to each other in the width direction Y. There is at least one first adhesive tape 300, which is bonded to the first side 201. It can be understood that multiple first adhesive tapes 300 can work together to fix the electrode assembly 200, thereby ensuring the binding effect of the electrode assembly 200 and reducing the probability of the battery cell becoming loose.

[0054] Referring to Figure 7, along the length direction X of the electrode assembly 200, the total length of the first adhesive tape 300 is D1. Along the width direction Y of the electrode assembly 200, the dimension h by which one end of the separator 230 extends beyond the same side of the negative electrode 220 satisfies: 15mm. 2 ≤h*D1≤1800mm 2 This not only binds the electrode assembly 200, reducing the chance of loosening between the positive electrode 210, negative electrode 220, and separator 230, thus ensuring the lithium-ion transport effect between the positive electrode 210, negative electrode 220, and separator 230, but also prevents the separator 230 from wrinkling and folding, reducing the risk of electrode material falling off and short circuit between the positive and negative electrodes.

[0055] It should be noted that when there is only one first tape 300, the total length of the first tape 300 refers to the size of the single first tape 300 along the length direction X of the electrode assembly 200; when there are multiple first tapes 300, the total length of the first tape 300 refers to the sum of the sizes of the multiple first tapes 300 along the length direction X of the electrode assembly 200.

[0056] In the above scheme, by controlling the sum of the dimensions of the multiple first tapes 300 and the dimension of the end of the diaphragm 230 that extends beyond the same side of the negative electrode 220 to meet the above range, on the one hand, the pressure-bearing area of ​​the diaphragm 230 can be increased when the tapes are fixed, the pressure on the diaphragm 230 can be reduced, and the probability of wrinkles and folds at the edge of the diaphragm 230 can be reduced, thereby reducing the risk of short circuit between the positive and negative electrodes and ensuring insulation between the positive electrode 210 and the negative electrode 220.

[0057] On the other hand, it can ensure that the size of the same side end of the separator 230 and the super negative electrode 220 is not too large, and the size of the first tape 300 is not too large, thereby reducing the probability of positional displacement when the tape is fixed, reducing the risk of the first tape 300 pulling the separator 230, and reducing the impact on heat dissipation of the electrode assembly 200, thereby improving the reliability of the battery.

[0058] Optionally, h*D1 can be 15mm. 2 150mm 2 300mm 2 450mm 2 600mm 2 750mm2 900mm 2 1050mm 2 1200mm 2 1350mm 2 1500mm 2 1650mm 2 1800mm 2 .

[0059] As an example, h*D1 is preferably 100mm. 2 ≤h*D1≤600mm 2 At this time, h*D1 can be 100mm 2 120mm 2 150mm 2 200mm 2 250mm 2 300mm 2 350mm 2 400mm 2 450mm 2 500mm 2 560mm 2 570mm 2 580mm 2 590mm 2 600mm 2 By further controlling h*D1 to meet the above-mentioned preferred range, the risk of membrane wrinkling and short circuit between positive and negative electrodes is further reduced; at the same time, the probability of positional displacement during tape fixation is further reduced, and the risk of tape pulling on the membrane is reduced.

[0060] In other embodiments, h satisfies: 0.5mm ≤ h ≤ 3mm.

[0061] In the above solution, by further controlling the size of one end of the separator 230 extending beyond the same side of the negative electrode 220 to meet the above range, on the one hand, the probability of the separator 230 wrinkling and folding when the tape is fixed can be reduced, thereby reducing the risk of short circuit between the positive and negative electrodes; on the other hand, the size of the separator 230 and the negative electrode 220 can be avoided from being too large, reducing the impact on the heat dissipation of the battery cell.

[0062] Optionally, h can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.3mm, 2.5mm, 2.7mm, or 3mm.

[0063] D1 satisfies: 20mm≤D1≤650mm.

[0064] In the above solution, by controlling the sum of the dimensions of the multiple first adhesive tapes 300 to meet the above range, on the one hand, the binding force of the multiple first adhesive tapes 300 on the battery cell can be improved, reducing the probability of the battery cell bulging; on the other hand, the influence of the first adhesive tapes 300 on the heat dissipation of the electrode assembly 200 can be reduced, reducing the probability of poor heat dissipation of the electrode assembly 200, and also reducing the manufacturing cost of the battery cell.

[0065] Optionally, D1 can be 20mm, 30mm, 40mm, 60mm, 90mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 530mm, 580mm, 610mm, 630mm, or 650mm.

[0066] As an example, D1 is preferably 60mm≤D1≤300mm. In this case, D1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm, 260mm, 270mm, 280mm, 290mm, or 300mm.

[0067] The preferred value for h is 1mm ≤ h ≤ 2.5mm. In this case, h can be 1mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.3mm, or 2.5mm.

[0068] As an example, Table 1 below shows the test results of battery short-circuit rate and cell temperature for several specific embodiments and comparative examples.

[0069] Table 1. Test Results

[0070] The battery short-circuit rate is defined as the percentage of batteries that experience a short circuit out of 100 batteries. The formula is (number of short-circuited batteries / 100) * 100%. The short-circuit test method involves using a pulse-type short-circuit tester, connecting the positive and negative terminals of a bare battery cell, and testing the voltage between the terminals. If the pulse voltage increase (Vp) is less than 200V, the battery is considered to have a short circuit. If the pulse voltage increase (Vp) reaches 200V or higher, the battery is considered not to have a short circuit.

[0071] The cell temperature testing method includes installing the cell into the casing, sealing the cover plate and casing by welding, and setting the terminals on the cover plate. The battery temperature rise is then tested. The specific testing steps are as follows:

[0072] 1) For lithium iron phosphate batteries: charge at a constant current rate of 4C to 3.65V, and then charge at a constant voltage rate until the current drops to 0.05C; for ternary lithium batteries: charge at a constant current rate of 4C to 4.25V, and then charge at a constant voltage rate until the current drops to 0.05C; connect a temperature sensor to the terminal post, sample the temperature of the terminal post during the charging process, and obtain the highest temperature T in the terminal post area. When the highest temperature T in the terminal post area is ≤ 45℃, it is considered good; when 45℃ < T ≤ 65℃, it is considered qualified; when T > 65℃, it is considered unqualified.

[0073] As can be seen from the above test results, the parameters of Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 are all within the protection range of h, D1, and h*D1 of this application, the temperature test results are all good, and the short circuit rate is less than 20%.

[0074] In particular, the parameter h in Examples 1-5 is within the preferred protection range of h in this application, the parameter D1 in Examples 1-5 is within the preferred protection range of D1 in this application, the parameter h*D1 in Examples 1-5 is within the preferred protection range of h*D1 in this application, and the temperature test results of Examples 1-5 are all good and no short circuit occurred.

[0075] In Examples 6 and 7, parameters h and D1 are not within the preferred protection range of the corresponding parameters. Parameter h*D1 is within the corresponding range of the above preferred embodiments. The temperature test results of Example 6 are all good and no short circuit occurred. The temperature test results of Example 7 are good but the battery short circuit rate is 2%.

[0076] In Example 8, parameters h and D1 are within the preferred protection range of their respective parameters, while parameter h*D1 is not within the preferred protection range of its respective parameter. In Example 8, no short circuit occurred and the temperature test result was only qualified.

[0077] In Examples 9 and 10, none of the parameters are within the preferred range for the corresponding parameters. The temperature test result of Example 9 is good, but the battery short circuit rate is 5%. In Example 10, no short circuit occurred, but the temperature test result is only qualified.

[0078] In Comparative Example 1, parameter h*D1 is not within the preferred range of the corresponding parameter and is below the lower limit of the protection range of the corresponding parameter. In this case, the probability of the separator 230 being wrinkled and folded when the tape is used for fixing is increased, thereby increasing the risk of short circuit between the positive and negative electrodes, resulting in a battery short circuit rate as high as 75%, and a large temperature rise in the battery, leading to unqualified temperature test results.

[0079] In Comparative Example 2, parameter h*D1 is not within the preferred range of the corresponding parameter and is higher than the upper limit of the protection range of the corresponding parameter. At this time, the separator 230 is easily torn when the tape is used for fixing, thereby increasing the risk of short circuit between the positive and negative electrodes, resulting in a battery short circuit rate of 20%. At the same time, due to the excessive size of the separator 230 and the negative electrode 220, the heat dissipation of the cell is affected, reducing the heat dissipation rate of the battery, resulting in a large temperature rise in the battery and the temperature test results being unqualified.

[0080] Therefore, the parameter range of this application reduces the battery short-circuit rate and the maximum temperature in the battery terminal area, thereby improving battery reliability.

[0081] In other embodiments, referring to Figures 4, 5 and 6, the electrode assembly 200 has a third side 203 and a fourth side 204, and the third side 203 and the fourth side 204 are disposed opposite to each other along the thickness direction Z of the electrode assembly 200.

[0082] The first tape 300 includes a first part 301, a second part 302, and a third part 303 connected in sequence. The first part 301 is bonded to the third side 203, the second part 302 is bonded to the first side 201, and the third part 303 is bonded to the fourth side 204. h satisfies: 0.5mm≤h≤2.5mm, and D1 satisfies: 30mm≤D1≤600mm.

[0083] In the above scheme, the first part 301, the second part 302 and the third part 303 of the first tape 300 can be integrally formed into a whole, or sequentially fixed into a whole. This application does not limit this.

[0084] The first part 301 of the first adhesive tape 300 is bonded to the third side 203, the third part 303 is bonded to the fourth side 204, and the second part 302 is bonded to the first side 201. It can be understood that the first adhesive tape 300 forms a U-shaped structure that binds to the side of the electrode assembly 200. It can also be understood that when the tape is fixed, the diaphragm 230 is relatively soft and is easily wrinkled and folded due to the force exerted by the tape during bonding. Therefore, by controlling h and D1 to meet the above range, on the one hand, the probability of the diaphragm 230 wrinkling and folding during tape fixing is further reduced. On the other hand, the sum of the sizes of the multiple first adhesive tapes 300 can be appropriately reduced as needed, thereby further reducing the impact on heat dissipation of the electrode assembly 200 and further reducing the probability of poor heat dissipation of the battery cell.

[0085] Optionally, h can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.3mm, or 2.5mm.

[0086] Optionally, D1 can be 30mm, 40mm, 60mm, 90mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 530mm, 580mm, or 600mm.

[0087] In some other embodiments, referring to FIG4, along the width direction Y of the electrode assembly 200, the size of the first part 301 is L1 and the size of the third part 303 is L2, satisfying: 5mm≤L1≤40mm, 5mm≤L2≤40mm.

[0088] In the above scheme, by controlling L1 and L2 within the aforementioned range, on the one hand, the connection strength between the first tape 300 and the electrode assembly 200 can be improved, thereby enhancing the binding effect of the first tape 300 on the separator 230, reducing the probability of cell loosening, reducing local lithium-ion transmission impedance, and improving the overall performance of the battery; on the other hand, it helps to reduce the probability of tape misalignment during bonding and fixing, thereby reducing the risk of the first tape 300 tearing the separator 230, and at the same time, it can reduce the impact on heat dissipation of the electrode assembly 200, further reducing the probability of poor cell heat dissipation.

[0089] Optionally, L1 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm.

[0090] Optionally, L2 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm.

[0091] In some other embodiments, referring to FIG7, a plurality of first adhesive tapes 300 are spaced apart along the length X direction of the electrode assembly 200.

[0092] In the above scheme, since multiple first adhesive tapes 300 are spaced apart along the length X direction of the electrode assembly 200, the first adhesive tapes 300 can be firmly attached to the surface of the electrode assembly 200, which plays the role of fixing the electrode assembly 200. On the one hand, it reduces the difficulty of bonding and reduces the probability of the first adhesive tapes 300 shifting and tearing the separator 230. On the other hand, it reduces the probability of local loosening of the battery cell and reduces the local lithium-ion transmission impedance of the battery cell, thereby helping to improve the overall performance of the battery.

[0093] In some other embodiments, referring to FIG7, along the length direction X of the electrode assembly 200, the distance between two adjacent first tapes 300 is L3, which satisfies: 20mm≤L3≤70mm.

[0094] In the above scheme, since the distance between two adjacent first adhesive tapes 300 meets the above range, on the one hand, it avoids the distance between adjacent first adhesive tapes 300 being too large, thereby improving the binding effect on the battery cell and reducing the probability that the electrode assembly 200 between adjacent first adhesive tapes 300 is too loose, thus reducing the transmission impedance of lithium ions between the positive and negative electrodes. On the other hand, it avoids the distance between adjacent first adhesive tapes 300 being too small, thereby reducing the probability that the separator 230 between adjacent first adhesive tapes 300 is pulled when fixed by the two adhesive tapes, thus reducing the probability that the separator 230 between adjacent first adhesive tapes 300 will fold.

[0095] Optionally, L3 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, or 70mm.

[0096] As an example, when two adjacent first tapes 300 are not arranged in parallel, or when the dimensions of two adjacent first tapes 300 along the length direction X of the electrode assembly 200 are different, the minimum distance between them along the length direction X of the electrode assembly 200 meets the above range. This can prevent the distance between adjacent first tapes 300 from being too small, reduce the probability of the diaphragm 230 between adjacent first tapes 300 being pulled when fixed by the tapes on both sides, and thus reduce the probability of the diaphragm 230 between adjacent first tapes 300 folding.

[0097] In some other embodiments, referring to FIG7, along the length direction X of the electrode assembly 200, the size of the first tape 300 is d, which satisfies 8mm≤d≤100mm.

[0098] In the above scheme, since the size of the first adhesive tape 300 meets the above range along the length direction X of the electrode assembly 200, on the one hand, it avoids the first adhesive tape 300 being too small, thereby increasing the force-bearing area of ​​the diaphragm 230 and reducing the pressure on the diaphragm 230, thus reducing the risk of the diaphragm 230 wrinkling and folding, and reducing the risk of short circuit of the exposed positive and negative electrodes; on the other hand, it avoids the first adhesive tape 300 being too large, thereby reducing the probability of the tape fixing position shifting during bonding and fixing, thus reducing the risk of the first adhesive tape 300 tearing the diaphragm 230. At the same time, it can reduce the impact of the first adhesive tape 300 on the heat dissipation of the electrode assembly 200, and reduce the probability of poor heat dissipation of the electrode assembly 200.

[0099] Optionally, d can be 8mm, 18mm, 28mm, 38mm, 48mm, 58mm, 68mm, 78mm, 88mm, 98mm, or 100mm.

[0100] As an example, along the length direction X of the electrode assembly 200, at least two first adhesive tapes 300 have different dimensions.

[0101] It is understandable that the dimensions of the multiple first adhesive tapes 300 along the length direction X of the electrode assembly 200 can be the same or different, thereby facilitating the improvement of the fixing effect at different positions as needed. For example, the width of the first adhesive tapes 300 at both ends along the length direction X of the electrode assembly 200 can be the same, and the width of the first adhesive tapes 300 in other areas can be different, thereby further reducing the probability of the diaphragm 230 wrinkling and ensuring the heat dissipation effect of the electrode assembly 200.

[0102] In some other embodiments, referring to FIG7, along the width direction Y of the electrode assembly 200, the size of the negative electrode 220 exceeds the size of the positive electrode 210 by less than or equal to 2 mm;

[0103] The condition d satisfies 10mm≤d≤100mm.

[0104] In the above scheme, by controlling that the size of the negative electrode 220 exceeds the size of the positive electrode 210 by less than or equal to 2 mm along the width direction Y of the electrode assembly 200, the edge of the separator 230 is guaranteed to have sufficient pressure from the positive electrode 210, thereby further reducing the probability of the separator 230 folding and reducing the risk of short circuit between the positive electrode 210 and the negative electrode 220 after the separator 230 folds.

[0105] In addition, it can reduce the risk of short circuit between the positive and negative electrodes caused by membrane wrinkling due to the smaller size of the negative electrode and the super-positive electrode, and at the same time avoid the probability of lithium plating on the surface of the negative electrode due to the excessively small size of the negative electrode and the super-positive electrode. On the other hand, it can also reduce the probability of the battery energy density being reduced due to the excess lithium intercalation position caused by the excessively large size of the negative electrode and the super-positive electrode, thereby improving the safety and stability of the battery.

[0106] The size of the negative electrode 220 exceeds the size of the positive electrode 210 by a value greater than or equal to 0.5 mm.

[0107] By controlling d to meet the above range, the force-bearing area of ​​the diaphragm 230 is further increased, and the pressure on the diaphragm 230 is reduced, thereby reducing the risk of the diaphragm 230 wrinkling and folding, and reducing the risk of short circuit of the exposed positive and negative electrodes; on the other hand, the size of the first adhesive tape 300 is avoided to prevent it from being too large, reducing the probability of the adhesive tape fixing position shifting during bonding and fixing, thereby reducing the risk of the first adhesive tape 300 tearing the diaphragm 230.

[0108] Optionally, d can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm.

[0109] In some other embodiments, referring to Figures 6 and 7, the battery cell also includes a plurality of second adhesive tapes 400, which are adhered to the second side 202.

[0110] Understandably, the second tape 400 can be firmly attached to the side of the electrode assembly 200, thereby fixing the electrode assembly 200, reducing the occurrence of multiple loose electrode plates, and reducing the probability of increased resistance caused by direct contact between the positive electrode plate 210 and the negative electrode plate 220.

[0111] Along the length direction X of the electrode assembly 200, the sum of the dimensions of the plurality of second adhesive tapes 400 is D2, which satisfies: 15mm 2 ≤h*D2≤1800mm 2 .

[0112] In the above scheme, since the ratio of the sum of the dimensions of the multiple second adhesive tapes 400 to the dimension of the end of the separator 230 that extends beyond the same side of the negative electrode 220 meets the above range, on the one hand, it can increase the pressure area of ​​the separator 230 when the tape is fixed, reduce the pressure on the separator 230, thereby reducing the probability of wrinkles and folds at the edge of the separator 230 and reducing the risk of short circuit between the positive and negative electrodes; on the other hand, it can ensure that the dimension of the end of the separator 230 that extends beyond the negative electrode 220 is not too large, and the dimension of the second adhesive tape 400 is not too large, thereby reducing the probability of positional displacement when the tape is fixed, reducing the risk of the second adhesive tape 400 pulling the separator 230, and at the same time reducing the impact on the heat dissipation of the electrode assembly 200, reducing the probability of poor heat dissipation of the electrode assembly 200.

[0113] Optionally, h*D2 can be 15mm. 2 150mm 2 300mm 2 450mm 2 600mm 2 750mm 2 900mm 2 1050mm 2 1200mm 2 1350mm 2 1500mm 2 1650mm 2 1800mm 2 .

[0114] In other embodiments, the length of the electrode assembly 200 is greater than or equal to 300 mm, and D1 satisfies 35 mm ≤ D1 ≤ 600 mm.

[0115] In the above scheme, by controlling the length of the electrode assembly 200 to be greater than or equal to 300 mm, the length of the electrode assembly 200 is increased, which helps to improve the battery energy density. However, this can easily lead to a looser motor assembly. Therefore, by further controlling D1 to meet the above range, the dimension of the tape along the length direction X of the electrode assembly 200 is increased, thereby improving the binding effect of the tape on the multilayer electrode sheets. Specifically, the length of the electrode assembly 200 can be greater than or equal to 300 mm and less than or equal to 1000 mm; specifically, it can be 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, or 1000 mm.

[0116] By controlling D1 to meet the above range, the binding force on the electrode assembly 200 is further improved, which is beneficial to lithium-ion transmission during subsequent charging and discharging. On the other hand, it ensures that the size of the first tape 300 is not too large, thereby reducing the probability of positional deviation when the tape is fixed, reducing the risk of the first tape 300 pulling the separator 230, and reducing the risk of electrode material falling off or positive and negative electrodes short-circuiting.

[0117] Optionally, D1 can be 35mm, 45mm, 65mm, 95mm, 155mm, 205mm, 255mm, 305mm, 355mm, 405mm, 455mm, 505mm, 535mm, 585mm, or 605mm.

[0118] In other embodiments, the thickness of the diaphragm 230 is greater than or equal to 8 μm and less than or equal to 40 μm.

[0119] In the above scheme, by controlling the thickness of the separator 230 to meet the above range, on the one hand, it prevents the thickness from being too thin, which would make it difficult to fix and easy to fold, thereby reducing the probability of the separator 230 folding; on the other hand, it prevents the thickness from being too thick, which would lead to excessive internal resistance, which is beneficial to reduce the energy loss of the battery during the charging and discharging process, improve the charging and discharging efficiency of the battery, enable the battery to complete the charging process faster, and output a larger current during discharge, thereby improving the overall performance of the battery.

[0120] In some other embodiments, referring to FIG8, the plurality of diaphragms 230 include a first diaphragm 720 and a second diaphragm 730. Along the thickness direction of the electrode assembly, the first diaphragm 720 and the second diaphragm 730 are disposed on both sides of the negative electrode sheet 220 to form a negative electrode unit 700. The first diaphragm 720 and the second diaphragm 730 are both bonded to and seal at least a portion of the negative electrode sheet 220.

[0121] Multiple negative electrode units 700 and multiple positive electrode plates 210 are stacked sequentially.

[0122] In the above scheme, the negative electrode 220, the first diaphragm 720 and the second diaphragm 730 are constructed as a negative electrode unit 700 to achieve a modular design. At this time, the first diaphragm 720 and the second diaphragm 730 are bonded and sealed to at least a portion of the negative electrode 220 to form a sealed structure and increase the hardness of the diaphragm 230 at the edge seal, thereby reducing the risk of the diaphragm 230 folding. This allows the size of the first tape 300 along the length X of the electrode assembly 200 to be smaller, thereby reducing the probability of the tape pulling the diaphragm 230 and further reducing the risk of the diaphragm 230 wrinkling and folding.

[0123] In some other embodiments, referring to Figures 2 and 9, the battery cell further includes a second tab 600, the first tab 500 and the second tab 600 having opposite polarities, and the first tab 500 and the second tab 600 being respectively disposed at both ends of the electrode assembly 200 in the length direction X.

[0124] Understandably, when multiple battery cells need to be connected in series or in parallel, the arrangement of the tabs at both ends makes the connection of the busbar simpler and more convenient. At the same time, the positive and negative tabs being located at both ends of the electrode assembly 200 along the length X direction can also prevent heat from being concentrated on one side of the electrode assembly 200, thereby ensuring the heat dissipation effect of the electrode assembly 200 and reducing the probability of heat concentration.

[0125] In some other embodiments, referring to FIG9, the housing 100 includes a housing 120 and an end cap 110. The housing 120 and the end cap 110 enclose a receiving cavity 101. There are multiple end caps 110, including a first end cap 111 and a second end cap 112. The first end cap 111 and the second end cap 112 are respectively located at both ends of the housing 120 along the length direction X. The first end cap 111 and the second end cap 112 are respectively provided with a first pole post assembly 111a and a second pole post assembly 112a. The first pole post assembly 111a and the second pole post assembly 112a are respectively electrically connected to the first electrode tab 500 and the second electrode tab 600.

[0126] It is understood that the terminal assembly is used to make electrical connections between the battery and external circuits. For example, the terminal assembly can be connected to the busbar to realize the series and parallel connection between multiple battery cells. This application does not limit this.

[0127] In the above scheme, the terminal assembly is electrically connected to the tab, which can provide a stable conduction path for the current inside the battery. The first terminal assembly 111a is connected to the first tab 500, and the second terminal assembly 112a is connected to the second tab 600, so that during the charging and discharging process, the current can be orderly transmitted from the electrode through the tab to the terminal, and then to the external circuit, ensuring that the battery can stably output or input current and guarantee the normal operation of the battery.

[0128] It is understood that the tab can be directly connected to the terminal assembly; or it can be connected through an intermediate component such as an adapter. Specifically, the tab can be connected to the adapter first, and then the adapter can be electrically connected to the terminal assembly. This application does not limit this.

[0129] Furthermore, the first terminal assembly 111a and the second terminal assembly 112a are respectively connected to their corresponding tabs, which can, to a certain extent, fix and support the tabs, making their position inside the battery more stable. Meanwhile, the end cap 110 and the housing 120 enclose a receiving cavity 101, and the connection between the terminal assembly and the tabs also helps to enhance the stability of the entire housing 100 structure, making the internal structure less prone to displacement or damage when the battery is subjected to external impact or vibration.

[0130] In other embodiments, this application provides a battery device including a battery cell as described in any of the above embodiments.

[0131] Since the battery device of this application embodiment has the battery cell of any of the above embodiments, the performance and safety of the battery device are improved, and the reliability is better.

[0132] In other embodiments, this application provides an electrical device including a battery device as described in the above embodiments.

[0133] Since the electrical device of this application embodiment has the battery device of the above embodiment, the reliability of the electrical device is improved.

[0134] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and battery devices disclosed in this application.

[0135] This application provides an electrical device that uses a single battery cell as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0136] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0137] The vehicle includes one of the following: gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles include, but are not limited to, pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. A battery is located at the bottom, front, or rear of the vehicle. The battery powers the vehicle. The battery serves as the vehicle's operating power source, supplying power to the vehicle's electrical system, including meeting the power requirements for starting, navigation, and operation.

[0138] The vehicle also includes a controller and a motor. The controller is used to control the battery to power the motor, including meeting the power needs of the vehicle during startup, navigation, and driving.

[0139] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0140] The battery includes a housing and individual battery cells housed therein. The housing can have various structures. In some embodiments, the housing includes a first sub-housing and a second sub-housing, which are combined to form the housing. The first and second sub-housings together define a receiving space for accommodating the individual battery cells. The second sub-housing includes a square structural member with an opening on one side, and the first sub-housing includes a square structural member with an opening on one side. The openings of the first and second sub-housings are correspondingly combined so that the first and second sub-housings together define the receiving space. The first sub-housing includes a plate-like structural member, and the openings of the first and second sub-housings are closed on one side.

[0141] In a battery, there are multiple battery cells, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these battery cells is housed within a casing. Alternatively, a battery can be composed of multiple battery cells first connected in series, parallel, or a combination thereof to form a battery module, and then these modules are connected in series, parallel, or a combination thereof to form a whole, which is also housed within a casing. The battery may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0142] The battery cell includes at least one of a secondary battery or a primary battery; the battery cell includes, but is not limited to, lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries.

[0143] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0144] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. The embodiments primarily describe the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0145] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0146] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is disposed within the receiving cavity. The electrode assembly is configured as a stacked cell. The stacked cell includes a positive electrode, a negative electrode, and a separator. There are multiple positive and negative electrodes, which are stacked sequentially along the thickness direction of the electrode assembly. The thickness direction is parallel to the stacking direction of the positive and negative electrodes. A first electrode tab is disposed at one end of the electrode assembly in the length direction; The electrode assembly has a first side and a second side opposite to each other in the width direction. The length direction, thickness direction and width direction of the electrode assembly are perpendicular to each other. The battery cell includes a first tape, and there is at least one first tape. The first tape is adhered to the first side. Along the length direction of the electrode assembly, the total length of the first tape is D1 mm. Along the width direction of the electrode assembly, the dimension by which one end of the separator extends beyond the same side end of the negative electrode sheet is h mm, satisfying: 15≤h*D1≤1800.

2. The battery cell according to claim 1, characterized in that, The h satisfies: 0.5mm≤hmm≤3mm, and the D1 satisfies: 20mm≤D1mm≤650mm.

3. The battery cell according to claim 1, characterized in that, The condition h*D1 satisfies 100≤h*D1≤600.

4. The battery cell according to claim 1, characterized in that, The electrode assembly has a third side and a fourth side, and the third side and the fourth side are disposed opposite to each other along the thickness direction of the electrode assembly. The first tape includes a first part, a second part, and a third part connected in sequence. The first part is adhered to the third side, the second part is adhered to the first side, and the third part is adhered to the fourth side. The h satisfies: 0.5mm≤hmm≤2.5mm, and the D1 satisfies: 30mm≤D1mm≤600mm.

5. The battery cell according to claim 4, characterized in that, Along the width direction of the electrode assembly, the first part has a size of L1 and the third part has a size of L2, satisfying: 5mm≤L1mm≤40mm, 5mm≤L2mm≤40mm.

6. The battery cell according to claim 1, characterized in that, Multiple first tapes are spaced apart along the length of the electrode assembly.

7. The battery cell according to claim 6, characterized in that, Along the length of the electrode assembly, the distance between two adjacent first tapes among the plurality of first tapes is L3, which satisfies: 20mm≤L3mm≤70mm.

8. The battery cell according to claim 1, characterized in that, The first tape has a size d, which satisfies 8mm≤dmm≤100mm.

9. The battery cell according to claim 8, characterized in that, Along the width direction of the electrode assembly, the size of the negative electrode exceeds the size of the positive electrode by less than or equal to 2 mm; The condition d satisfies 10mm≤dmm≤100mm.

10. The battery cell according to claim 1, characterized in that, The battery cell also includes a plurality of second adhesive tapes, which are adhered to the second side. Along the length of the electrode assembly, the sum of the dimensions of the plurality of second tapes is D2mm, satisfying: 15≤h*D2≤1800.

11. The battery cell according to claim 1, characterized in that, The length of the electrode assembly is greater than or equal to 300 mm, and D1 satisfies the condition that 35 mm ≤ D1 mm ≤ 600 mm.

12. The battery cell according to claim 1, characterized in that, The thickness of the diaphragm is greater than or equal to 8 μm and less than or equal to 40 μm.

13. The battery cell according to claim 1, characterized in that, The plurality of diaphragms include a first diaphragm and a second diaphragm. Along the thickness direction of the electrode assembly, the first diaphragm and the second diaphragm are disposed on both sides of the negative electrode sheet to form a negative electrode unit. The first diaphragm and the second diaphragm are both bonded to and seal at least a portion of the negative electrode sheet. Multiple negative electrode units and multiple positive electrode plates are stacked sequentially.

14. The battery cell according to claim 1, characterized in that, The battery cell also includes a second tab, and the first tab and the second tab have opposite polarities. The first tab and the second tab are respectively disposed at both ends of the electrode assembly in the length direction.

15. The battery cell according to claim 14, characterized in that, The outer casing includes a housing and end caps, which enclose the receiving cavity. There are multiple end caps, including a first end cap and a second end cap. The first end cap and the second end cap are respectively located at both ends of the housing along its length. The first end cap and the second end cap are respectively provided with a first pole post assembly and a second pole post assembly, which are electrically connected to the first electrode tab and the second electrode tab, respectively.

16. The battery cell according to claim 1, characterized in that, The separator is provided between adjacent positive and negative electrode plates, as well as on the outermost positive and / or negative electrode plates along the thickness direction of the electrode assembly.

17. The battery cell according to claim 1, characterized in that, The diaphragm is made of at least one of the following materials: glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

18. The battery cell according to claim 1, characterized in that, The material of the first tape is polyimide film (PI film), acrylic imide film (PPA film), or polyethylene film.

19. The battery cell according to claim 1, characterized in that, The condition D1 satisfies: 60mm≤D1≤300mm.

20. The battery cell according to claim 1, characterized in that, The size of the negative electrode exceeds the size of the positive electrode by a value greater than or equal to 0.5 mm.

21. The battery cell according to claim 1, characterized in that, The length of the electrode assembly can be greater than or equal to 300 mm and less than or equal to 1000 mm.

22. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-21.

23. An electrical appliance, characterized in that, Includes the battery cell according to any one of claims 1-21 or the battery device according to claim 22.

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