Battery cell, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly, electrolyte and a liquid absorption assembly. The electrode assembly and the electrolyte are contained in the shell, and the liquid absorption assembly is arranged on at least part of the surface of the electrode assembly. The liquid absorption assembly comprises a base body layer and a liquid absorption layer. The liquid absorption layer is connected to at least one side surface of the substrate layer along the thickness direction of the substrate layer and is used for absorbing electrolyte, and the impact strength of the substrate layer is greater than that of the liquid absorption layer. And the liquid absorption assembly can absorb the electrolyte and utilize the free electrolyte in the battery, so that the utilization rate of the free electrolyte can be maximized, and no liquid leakage of the battery can be realized. The electrolyte can be discharged after the liquid absorption layer is extruded, and the electrolyte can be released to be utilized by the electrode assembly when needing to be utilized, so that the problem of free electrolyte corrosion is solved. The expansion of the liquid absorption layer improves the constraint on the electrode assembly, improves the supporting effect on the electrode assembly, and can improve the lithium precipitation problem of the thinned area.

Description

Technical Field

[0001] The present application relates to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, with the development of lithium-ion battery technology, lithium-ion batteries are widely used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, as well as in multiple fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace. Due to the great development of lithium-ion batteries, higher requirements are put forward for their corrosion resistance and lithium plating inhibition. Summary of the Utility Model

[0003] The purpose of the present application is to provide a battery cell, a battery, and an electrical device.

[0004] The embodiments of the present application are implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0006] A housing;

[0007] An electrode assembly, accommodated in the housing;

[0008] An electrolyte, accommodated in the housing;

[0009] A liquid absorption assembly, the liquid absorption assembly is disposed on at least a part of the surface of the electrode assembly, the liquid absorption assembly includes a matrix layer and a liquid absorption layer, the liquid absorption layer is connected to at least one surface of the matrix layer along the thickness direction of the matrix layer and is used for absorbing the electrolyte, and the impact strength of the matrix layer is greater than that of the liquid absorption layer.

[0010] In the above technical solution, by providing a liquid absorption assembly on the electrode assembly, and the liquid absorption layer of the liquid absorption assembly can absorb the electrolyte and expand, and the liquid absorption layer can discharge the electrolyte after being squeezed. The above liquid absorption assembly can absorb the electrolyte, utilize the free electrolyte in the battery, is beneficial to maximizing the utilization rate of the free electrolyte, and is beneficial to achieving "no leakage of the battery". And the liquid absorption layer can discharge the electrolyte after being squeezed, and can also release it for the electrode assembly to use when the electrolyte needs to be utilized, thereby avoiding the problems of excessive free electrolyte corroding the electrode assembly, the top cover of the battery cell, and the bottom corrosion. And when the liquid absorption layer expands, it greatly improves the restraint on the electrode assembly and improves the supporting effect on the electrode assembly, and can improve the lithium plating problem in the thinned area of the electrode assembly.

[0011] In some optional embodiments, the electrode assembly includes a main body area and a thinned area along a first direction, the thinned area is connected to the main body area, and the thickness of the electrode tab in the main body area of the electrode assembly is greater than the thickness of the electrode tab in the thinned area;

[0012] The liquid absorption component is at least partially disposed in the thinning area.

[0013] In the above technical solution, by disposing the liquid absorption component at least partially in the thinning area, the binding effect on the electrode assembly can be greatly improved, the supporting effect on the thinning area of the electrode assembly can be enhanced, the tightness of the electrode sheet and the separator in the thinning area can be increased, and the lithium deposition problem in the thinning area of the electrode assembly can be improved.

[0014] In some alternative embodiments,

[0015] The liquid absorption component is disposed in the main body area and the thinning area.

[0016] In the above technical solution, by providing liquid absorption layers with different thicknesses in the main body area and the thinning area, that is, the thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer, it is beneficial to improve the utilization rate of the liquid absorption component on the premise of enhancing the binding effect on the electrode assembly and the supporting effect on the thinning area.

[0017] In some alternative embodiments, the liquid absorption component includes a first liquid absorption component and a second liquid absorption component. The first liquid absorption component is disposed in the thinning area; the first liquid absorption component includes a first liquid absorption layer;

[0018] The second liquid absorption component is disposed in the main body area; the second liquid absorption component includes a second liquid absorption layer;

[0019] The thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer.

[0020] In the above technical solution, by providing liquid absorption layers with different thicknesses in the main body area and the thinning area, that is, the thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer, it is beneficial to improve the utilization rate of the liquid absorption component on the premise of enhancing the binding effect on the electrode assembly and the supporting effect on the thinning area.

[0021] In some alternative embodiments, the thinning area is located at the edge of the electrode assembly.

[0022] In some alternative embodiments, the electrode assembly includes an end face;

[0023] The liquid absorption component is disposed on the end face.

[0024] In the above technical solution, by disposing the liquid absorption component on the bottom face, it is beneficial to absorb the free electrolyte at the bottom of the battery, thereby facilitating the reduction of the problem of electrolyte corrosion on the bottom wall of the battery.

[0025] In some alternative embodiments, the liquid absorption component is disposed between the electrode assembly and the outer casing; and the matrix layer contacts the outer casing; the liquid absorption layer contacts the surface of the electrode assembly; the matrix layer is provided with holes.

[0026] In the above technical solution, the opening design of the matrix layer enables the electrolyte absorbed by the liquid absorption layer to achieve the effect of directional movement or directional storage; combined with the built-in liquid absorption layer, the effect of built-in electrolyte, that is, directional storage, can also be achieved. Moreover, the design of the liquid absorption layer located on the inner side can cause the electrolyte absorbed by the liquid absorption layer to be released in a timely manner to the electrode assembly when stressed, rather than being released to the outside, where more is likely to be lost or it is difficult to be absorbed again.

[0027] In some alternative embodiments, the matrix layer is bonded to the outer shell.

[0028] In some alternative embodiments, the electrode assembly includes a side surface; the liquid absorption assembly is disposed on the side surface.

[0029] In the above technical solution, by disposing the liquid absorption assembly on the side surface of the electrode assembly, it is beneficial to design the liquid absorption layer to be located on the inner side, which is beneficial to absorbing and releasing the electrolyte and improving the utilization rate of the electrolyte.

[0030] In some alternative embodiments, the thickness of the liquid absorption layer is 50 μm to 100 μm.

[0031] In the above technical solution, by setting the thickness of the liquid absorption layer to be 50 μm to 100 μm, it is beneficial to absorb a sufficient amount of electrolyte, beneficial to improving the binding effect after expansion, beneficial to solving the problem of free electrolyte corroding the electrode assembly, and beneficial to solving the problem of lithium plating in the thinned area.

[0032] In some alternative embodiments, the thickness of the liquid absorption layer is 60 μm to 80 μm.

[0033] In some alternative embodiments, the liquid absorption layer is a polystyrene film layer.

[0034] In the above technical solution, by setting the liquid absorption layer as a polystyrene film layer, the expansion effect of the liquid absorption layer can be effectively improved, enabling it to have good compressibility and good ductility, avoiding excessive adsorption of the electrolyte, and being able to cooperate well with the expansion and compression occurring during battery breathing without affecting the normal electrolyte consumption of the battery.

[0035] In some alternative embodiments, the number of liquid absorption layers includes multiple;

[0036] A glue layer is provided between the multiple liquid absorption layers.

[0037] In the above technical solution, by setting the number of liquid absorption layers to include multiple; and a glue layer is provided between the multiple liquid absorption layers, the expansion effect can be further improved, thereby enhancing the binding effect on the electrode assembly.

[0038] In some alternative embodiments, the thickness of the glue layer is 5 μm to 15 μm.

[0039] In the above technical solution, by setting the thickness of the adhesive layer to be 5 μm to 15 μm, effective adhesion can be provided, which is beneficial to the overall comprehensive performance of the entire liquid absorption component.

[0040] In some alternative embodiments, the thickness of the substrate layer is 5 μm to 15 μm.

[0041] In the above technical solution, by setting the thickness of the substrate layer to be 5 μm to 15 μm, sufficient support strength can be provided for the liquid absorption layer 120.

[0042] In some alternative embodiments, the substrate layer is a polyethylene terephthalate film layer or a thermally conductive silicone layer.

[0043] In some alternative embodiments, the battery cell is a square shell battery cell.

[0044] In the above technical solution, the battery cell is a square shell battery cell, and the liquid absorption component disposed on the electrode assembly can better play a role in binding the electrode assembly and increasing the support for the electrode assembly, and improve the problem of lithium deposition in the thinning area of the electrode assembly.

[0045] In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in any one of the embodiments of the first aspect.

[0046] In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 is a schematic diagram of an embodiment of the liquid absorption component of the present application;

[0049] Figure 2 is a schematic diagram of another embodiment of the liquid absorption component of the present application;

[0050] Figure 3 is a schematic diagram of an embodiment of the electrode assembly provided with the liquid absorption component of the present application;

[0051] Figure 4 is a schematic diagram of another embodiment of the electrode assembly provided with the liquid absorption component of the present application;

[0052] Figure 5It is a schematic diagram of another embodiment of the electrode assembly of the present application provided with a liquid absorption assembly;

[0053] Figure 6 It is a schematic diagram of another embodiment of the electrode assembly of the present application provided with a liquid absorption assembly;

[0054] Figure 7 It is a schematic diagram of another embodiment of the electrode assembly of the present application provided with a liquid absorption assembly;

[0055] Figure 8 It is a schematic diagram of another embodiment of the electrode assembly of the present application provided with a liquid absorption assembly;

[0056] Figure 9 It is a schematic diagram of a battery cell with a square shell structure according to an embodiment of the present application;

[0057] Figure 10 It is Figure 9 The exploded view of the battery cell according to an embodiment of the present application shown;

[0058] Figure 11 It is a schematic diagram of a battery module according to an embodiment of the present application;

[0059] Figure 12 It is a schematic diagram of a battery pack according to an embodiment of the present application;

[0060] Figure 13 It is Figure 7 The exploded view of the battery pack according to an embodiment of the present application shown;

[0061] Figure 14 It is a schematic diagram of an electrical device using the battery as a power source according to an embodiment of the present application;

[0062] Figure 15 It is a schematic diagram of a thinned area shown according to an embodiment of the present application.

[0063] Icon:

[0064] 1 - Battery pack; 2 - Upper box body; 3 - Lower box body; 4 - Battery module; 5 - Battery cell; 51 - Outer shell; 52 - Electrode assembly; 521 - Negative electrode tab; 522 - Positive electrode tab; 523 - Separator; 53 - Cover plate; 10 - Liquid absorption assembly; 110 - Matrix layer; 111 - Hole; 120 - Liquid absorption layer; 131 - Thinned area; 132 - Main body area; 133 - End face; 134 - Side face; 140 - Adhesive layer. Detailed implementation manners

[0065] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0067] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features.

[0068] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0069] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0070] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0071] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the heights, lengths, widths, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall height, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0072] The presence of free electrolyte in the battery causes problems such as corrosion of the electrode assembly, battery top cover, battery bottom wall, etc.

[0073] In addition, there is currently a thinning area at the edge of the electrode assembly where both the thickness and areal density are lower than those in the main body area. This causes two problems: First, the areal density in the thinning area is lower than that in the main body area, which may result in the NP ratio (the ratio of the negative electrode capacity to the positive electrode capacity) at the position of the thinning area being lower than the designed value, thereby posing a risk of lithium plating at the edge. Second, the thickness of the thinning area is lower than that in the main body area, which leads to uneven lamination of the electrode sheets. The electrode sheets in the thinning area do not adhere tightly to the separator, the gap between the positive and negative electrode sheets increases, and the lithium ion transmission distance increases, resulting in a more serious lithium plating problem in the thinning area.

[0074] Referring to Figures 1-9 , based on this, in the first aspect of the embodiment of the present application, a battery cell 5 is provided, including:

[0075] A housing 51;

[0076] An electrode assembly 52, accommodated in the housing 51;

[0077] An electrolyte, accommodated in the housing;

[0078] A liquid absorption assembly 10, the liquid absorption assembly 10 is disposed on at least part of the surface of the electrode assembly 52; the liquid absorption assembly 10 includes a matrix layer 110 and a liquid absorption layer 120; the liquid absorption layer 120 is connected to at least one surface of the matrix layer 110 along the thickness direction of the matrix layer 110 and the liquid absorption layer 120 is used for absorbing the electrolyte, and the impact strength of the matrix layer 110 is greater than that of the liquid absorption layer 120.

[0079] In the above technical solution, the liquid absorption layer 120 can absorb the electrolyte and expand, and the liquid absorption layer 120 can discharge the electrolyte after being squeezed.

[0080] In the above technical solution, by disposing the liquid absorption assembly 10 on the electrode assembly 52, and the liquid absorption layer 120 of the liquid absorption assembly 10 can absorb the electrolyte and expand, and the liquid absorption layer 120 can discharge the electrolyte after being squeezed. The above liquid absorption assembly 10 can absorb the electrolyte and utilize the free electrolyte in the battery, which is beneficial to maximizing the utilization rate of the free electrolyte and facilitating the realization of "no electrolyte leakage in the battery". And the liquid absorption layer 120 can discharge the electrolyte after being squeezed, and can also release it for use by the electrode assembly when the electrolyte needs to be utilized, thereby avoiding the problem of excessive free electrolyte corroding the electrode assembly, the top cover of the battery cell, and the bottom corrosion. Moreover, when the liquid absorption layer 120 expands, it greatly improves the restraint on the electrode assembly 52 and enhances the supporting effect on the electrode assembly, which can improve the lithium plating problem in the thinning area of the electrode assembly.

[0081] Furthermore, the liquid absorption component 10 is disposed on the electrode component 52; the liquid absorption layer 120 of the liquid absorption component 10 can expand, and when expanding, it can enhance the restraint on the electrode component 52, reduce the risk of wrinkling, and improve the interface. And because the liquid absorption layer 120 can absorb the electrolyte and expand, and the liquid absorption layer 120 can discharge the electrolyte after being squeezed, the liquid absorption component 10 has good compressibility, that is, the liquid absorption component 10 has good ductility, which can avoid excessive adsorption of the electrolyte and can cooperate well with the expansion and compression that occur when the battery component breathes, without affecting the normal consumption of the electrolyte by the battery component.

[0082] In the above technical solution, the matrix layer 110 mainly plays a role of mechanical support, resistance to electrolyte, and a certain role of waterproof and oxygen isolation; the matrix layer 110 has higher impact strength and can effectively reduce the warping of the liquid absorption layer 120. It has good stress cracking performance.

[0083] In some embodiments of the present application, the above impact strength can be characterized by stress cracking performance.

[0084] Exemplarily, the method for measuring the stress cracking performance includes:

[0085] S1. Prepare samples: Prepare samples with corresponding sizes and shapes according to the type of the material or product to be tested;

[0086] S2. Environmental control: Place the samples in a temperature control box and a humidity control box, and control the normal temperature and 50% humidity;

[0087] S3. Apply stress: Fix the samples on an environmental stress cracking tester and apply a mechanical stress of a predetermined magnitude;

[0088] S4. Periodic loading: Perform periodic loading on the samples at a predetermined time interval and loading amplitude;

[0089] S5. Observation and recording: After each time interval, observe the cracking condition of the samples using a microscope and record information such as the number of cracks and the crack length;

[0090] S6. Data processing and analysis: Analyze the environmental stress cracking performance of the samples according to the observed and recorded data.

[0091] Exemplarily, in some alternative embodiments of the present application, the above matrix layer 110 can be selected as PET; the above liquid absorption layer 120 can be selected as OPS; the matrix layer 110 has higher impact strength.

[0092] Further, in some embodiments of the present application, the above-mentioned "battery cell" may be a lithium-ion battery cell or the like. Generally, a battery cell includes an electrode assembly and an electrolyte; the "electrode assembly" includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator. During the charging and discharging process of the battery, active ions are inserted into and extracted from between the positive electrode plate and the negative electrode plate. The electrolyte plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The separator is disposed between the positive electrode plate and the negative electrode plate, mainly to prevent short circuit between the positive and negative electrodes, and at the same time allows ions to pass through.

[0093] Referring to Figure 15 , in some embodiments of the present application, the above-mentioned electrode assembly may be laminated or wound in sequence according to the positive electrode plate 522, the negative electrode plate 521, and the separator 523 to form an electrode assembly. As a whole, for the electrode assembly 52, the liquid absorption assembly 10 may be selectively disposed at different positions on the surface of the electrode assembly 52.

[0094] Referring to Figure 3 , in some embodiments of the present application, the electrode assembly 52 has a thinning area 131; along a first direction (such as the arrow direction in Figure 15 ), it includes a main body area 132 and a thinning area 131. The thinning area 131 is connected to the main body area 132, and the thickness of the electrode plate of the electrode assembly 52 in the main body area 132 is greater than the thickness of the electrode plate of the electrode assembly 52 in the thinning area 131;

[0095] The liquid absorption assembly 10 is at least partially disposed in the thinning area 131.

[0096] In the above technical solution, by disposing the liquid absorption assembly 10 at least partially in the thinning area 131, the binding effect on the electrode assembly 52 can be greatly improved, the supporting effect on the thinning area 131 of the electrode assembly can be improved; the tightness of the electrode plate in the thinning area 131 and the separator can be improved, and the lithium deposition problem in the thinning area of the electrode assembly can be improved.

[0097] Further, referring to Figure 15 , in some embodiments of the present application, the above-mentioned "thinning area 131" has a meaning well-known in the art, and generally can be understood as referring to an area with a relatively small thickness in the electrode assembly 52. The GAP (gap) of the thinning area 131 is relatively large compared to the main body area 132.

[0098] Referring to Figure 4 , further, in some embodiments of the present application,

[0099] The liquid absorption assembly 10 is disposed in the main body area 132 and the thinning area 131.

[0100] In the above technical solution, by arranging the liquid absorption component 10 in both the main body area 132 and the thinned area 131, it is further beneficial to improve the binding effect on the electrode component 52, enhance the tightness of the electrode sheet in the thinned area 131 fitting with the separator, improve the supporting effect on the thinned area 131 of the electrode component, and can improve the problem of lithium deposition in the thinned area of the electrode component.

[0101] In the above technical solution, the "main body area 132" has a well-known meaning in the art and is generally understood to refer to the area in the electrode component 52 that has a relatively larger thickness and is located in the middle position compared to the aforementioned "thinned area 131".

[0102] Refer to Figure 5 , further, in some embodiments of the present application, the liquid absorption component 10 includes a first liquid absorption component and a second liquid absorption component. The first liquid absorption component is arranged in the thinned area 131; the first liquid absorption component includes a first liquid absorption layer;

[0103] The second liquid absorption component is arranged in the main body area 132; the second liquid absorption component includes a second liquid absorption layer;

[0104] The thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer.

[0105] In the above technical solution, by arranging liquid absorption layers with different thicknesses in the main body area 132 and the thinned area 131, that is, the thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer, it is beneficial to improve the utilization rate of the liquid absorption component 10 on the premise of enhancing the binding effect on the electrode component 52 and the supporting effect on the thinned area.

[0106] Further, in some embodiments of the present application, the aforementioned thinned area is located at the edge of the electrode component.

[0107] Refer to Figure 6 , further, in some embodiments of the present application, the electrode component 52 includes an end face 133;

[0108] The liquid absorption component 10 is arranged on the end face 133.

[0109] In the above technical solution, by arranging the liquid absorption component 10 on the end face 133, it is beneficial to absorb the free electrolyte at the end of the battery, thereby helping to reduce the problem of electrolyte corrosion on the battery end face.

[0110] Further optionally, in some embodiments of the present application, the above liquid absorption component 10 can be directly bonded to the end face 133 of the electrode component to absorb the free electrolyte on the end face of the battery component.

[0111] Alternatively, in some optional embodiments of the present application, an insulating film (such as Mylar film) is provided on the end face 133 of the electrode assembly; then the liquid absorption assembly 10 is bonded to the insulating film, and the free electrolyte on the end face of the battery assembly can also be absorbed.

[0112] In the above technical solution, the "end face" has a well-known meaning in the art, and generally can be understood that the end face is the surface where the electrode plates are stacked. When the electrode assembly is a wound electrode assembly, the end faces are the two faces perpendicular to the winding axis; when the electrode assembly is a stacked electrode assembly, the end faces are the four faces parallel to the stacking direction.

[0113] Refer to Figure 7 , further, in some embodiments of the present application,

[0114] The liquid absorption assembly 10 is disposed between the electrode assembly 52 and the housing 51; and the matrix layer 110 contacts the housing 51; the liquid absorption layer 120 contacts the surface of the electrode assembly 52; the matrix layer 110 is provided with holes 111.

[0115] In the above technical solution, the hole design of the matrix layer 110 can enable the electrolyte absorbed by the liquid absorption layer 120 to achieve the effect of directional movement or directional storage. For example, only holes 111 are drilled above the matrix layer 110 ( Figure 7 as shown), that is, the upper liquid absorption layer 120 can absorb more or only allow the upper liquid absorption layer 120 to absorb the electrolyte. Cooperating with the built-in liquid absorption layer 120, the holes in the matrix layer 110 can also achieve the effect of storing the built-in electrolyte, that is, directional storage.

[0116] Further, in the above technical solution, the design that the liquid absorption layer 120 is located inside can enable all the electrolyte absorbed by the liquid absorption layer 120 to be released in time to provide for the electrode assembly (separator) when stressed. Instead of releasing it outward, more is likely to be lost or it is not easy to be absorbed again.

[0117] Further optionally, in some embodiments of the present application, the above holes 111 can be opened throughout the upper and lower parts of the matrix layer 110 (such as Figure 8 as shown). In this solution, it can cooperate with the setting inside the liquid absorption layer 120, and all the electrolyte absorbed by the liquid absorption layer 120 can be released in time to provide for the electrode assembly when stressed, improving the utilization rate of the electrolyte.

[0118] Further optionally, in some embodiments of the present application, the above holes 111 are evenly opened in the matrix layer 110 (when only the upper half of the matrix layer 110 is opened, the intervals between adjacent holes 111 are uniform); which is beneficial to the uniform release and absorption of the electrolyte.

[0119] Further optionally, in some embodiments of the present application, the shape (cross-section) of the above holes 111 can be selected as round holes, square holes or irregular holes.

[0120] Further, in some embodiments of the present application, the substrate layer is bonded to the outer shell.

[0121] Further, with reference to Figures 1-10 , in some embodiments of the present application, the electrode assembly 52 includes a side surface 134; the liquid absorption assembly 10 is disposed on the side surface 134.

[0122] In the above technical solution, by disposing the liquid absorption assembly 10 on the side surface 134 of the electrode assembly 52, it is beneficial to design the liquid absorption layer 120 to be located inside, which is beneficial to absorbing and releasing the electrolyte and improving the utilization rate of the electrolyte.

[0123] In the above technical solution, the "side surface" has a well-known meaning in the art and can generally be understood as the surface of the electrode assembly 52 that is connected to the large surface, and there are generally multiple side surfaces.

[0124] Further, in some embodiments of the present application, with reference to Figures 1-2 , the thickness of the liquid absorption layer 120 is 50 μm to 100 μm.

[0125] In the above technical solution, by setting the thickness of the liquid absorption layer 120 to be 50 μm to 100 μm, it is beneficial to absorb a sufficient amount of electrolyte, beneficial to improving the binding effect after expansion, beneficial to improving the problem of free electrolyte corroding the electrode assembly, and beneficial to improving the problem of lithium deposition in the thinned area.

[0126] Exemplarily, in some embodiments of the present application, the thickness of the above liquid absorption layer 120 is 50 μm, 55 μm, 58 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm or the thickness within the range between any two of the foregoing values.

[0127] Further optionally, in some embodiments of the present application, the thickness of the liquid absorption layer 120 is 60 μm to 80 μm.

[0128] It should be noted that the thickness of the above liquid absorption layer 120 is the cumulative thickness of the liquid absorption layer 120. For example, when the liquid absorption layer 120 includes multiple layers, the cumulative thickness of the multiple liquid absorption layers 120 is within the range of 50 μm to 100 μm.

[0129] Further, in some embodiments of the present application, the liquid absorption layer 120 is a polystyrene film layer.

[0130] In the above technical solution, by setting the liquid absorption layer as a polystyrene film layer, the expansion effect of the liquid absorption layer can be effectively improved, enabling it to have good compressibility and good ductility, avoiding excessive adsorption of the electrolyte, and being able to cooperate well with the expansion and compression during the battery breathing without affecting the normal electrolyte consumption of the battery.

[0131] Exemplarily, in some embodiments of the present application, the above liquid absorption layer 120 is made of OPS material.

[0132] Furthermore, in some embodiments of the present application, referring to Figure 2 , the number of the liquid absorption layers 120 includes multiple;

[0133] A glue layer 140 is provided between the multiple liquid absorption layers 120.

[0134] In the above technical solution, by setting the number of the liquid absorption layers 120 to be multiple; and a glue layer 140 is provided between the multiple liquid absorption layers 120, the swelling effect can be further improved, thereby improving the binding effect on the electrode assembly 52.

[0135] Exemplarily, in some embodiments of the present application, the number of the above liquid absorption layers 120 can be optionally set to three; that is, the liquid absorption assembly 10 includes three layers of liquid absorption layers, and adjacent liquid absorption layers 120 can be bonded together through the glue layer 140.

[0136] In other alternative embodiments of the present application, the number of the above liquid absorption layers 120 can also include other numbers, such as two, four, five, etc.; it can be changed according to the requirements of different batteries. For example, if a higher swelling requirement is needed, the liquid absorption layer 120 can be thickened or the number of the liquid absorption layers 120 can be increased.

[0137] Further optionally, in some embodiments of the present application, the above glue layer 140 mainly plays a role in providing adhesion, and the glue layer 140 will not react with the electrolyte and has electrolyte resistance. Exemplarily, the above glue layer 140 can be optionally made of materials such as acrylate glue.

[0138] Furthermore, in some embodiments of the present application, the thickness of the glue layer 140 is 5 μm to 15 μm.

[0139] In the above technical solution, by setting the thickness of the glue layer 140 to be 5 μm to 15 μm, effective adhesive force can be provided, and it is beneficial to the overall comprehensive performance of the entire liquid absorption assembly 10.

[0140] It should be noted that the thickness of the above glue layer 140 is the thickness of a single glue layer.

[0141] Further optionally, exemplarily, in some embodiments of the present application, the thickness of the above glue layer 140 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm or the thickness within the range between any two of the foregoing values.

[0142] Further, in some embodiments of the present application, the thickness of the substrate layer 110 is 5 μm to 15 μm.

[0143] In the above technical solution, setting the thickness of the substrate layer 110 to 5 μm to 15 μm can provide sufficient support strength for the liquid absorption layer 120.

[0144] Exemplarily, in some embodiments of the present application, the thickness of the substrate layer 110 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm or the thickness within the range between any two of the foregoing values.

[0145] Further optionally, in some embodiments of the present application, the substrate layer is a polyethylene terephthalate film layer or a thermally conductive silicone layer.

[0146] Exemplarily, the material of the substrate layer 110 can be selected as PET (polyethylene terephthalate); or other materials that can meet the requirement of being resistant to the electrolyte solution.

[0147] Further optionally, in other alternative embodiments of the present application, the material of the substrate layer 110 can be selected as a material that is resistant to the electrolyte solution and meets the thermal conductivity requirement. Exemplarily, the material of the substrate layer 110 can be selected as thermally conductive silicone.

[0148] Further, in some embodiments of the present application, the battery cell 5 is a square shell battery cell.

[0149] In the above technical solution, since the battery cell 5 is a square shell battery cell, the liquid absorption assembly 10 disposed on the electrode assembly 52 can better play a role in binding the electrode assembly, increasing the support for the electrode assembly, and improving the problem of lithium deposition in the thinning area of the electrode assembly.

[0150] [Positive electrode plate]

[0151] The positive electrode plate includes a positive current collector and a positive electrode film layer provided on at least one surface of the positive current collector.

[0152] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode film layer is provided on any one or both of the two opposite surfaces of the positive current collector.

[0153] In some embodiments, the positive current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum foil may be used. The composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector may be formed by forming a metal material (such as 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 (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0154] In some embodiments, when the battery cell is a lithium-ion battery, the positive electrode active material may be a positive electrode active material known in the art for lithium-ion batteries. As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate with an olivine structure, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery positive electrode active material may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (which may also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which may also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which may also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which may also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05at least one of O2) and its modified compounds. Examples of the lithium phosphate with olivine structure may include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0155] In some embodiments, in order to further improve the energy density of the battery cell, the positive electrode active material for the lithium-ion battery may include a lithium transition metal oxide having the general formula Li a Ni b Co c M d O e A f and one or more of its modified compounds; wherein, 0.8 ≤ a ≤ 1.2, 0.5 ≤ b < 1, 0 < c < 1, 0 < d < 1, 1 ≤ e ≤ 2, 0 ≤ f ≤ 1, M is selected from one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B, and A is selected from one or more of N, F, S, and Cl.

[0156] In some embodiments, by way of example, the positive electrode active material for the lithium-ion battery may include LiCoO2, LiNiO2, LiMnO2, LiMn2O4, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (NCM 523 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (NCM 811 ), LiNi 0.85 Co 0.15 Al 0.05 O2, LiFePO4, and LiMnPO4.

[0157] In the present application, the modified compounds of the above positive electrode active materials may be doping modification and / or surface coating modification of the positive electrode active materials.

[0158] In some embodiments, the above positive electrode active materials may be polyanionic compounds.

[0159] As an alternative technical solution of the present application, the polyanionic compound may be Li 1+x Mn 1-y A y P 1-z R z O4; wherein, x is any value within the range of -0.100 to 0.100, y is any value within the range of 0.001 to 0.500, z is any value within the range of 0.001 to 0.100, A includes one or more elements selected from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ni, Co, Ga, Sn, Sb, Nb and Ge, and R includes one or more elements selected from B, S, Si and N;

[0160] As an alternative technical solution of the present application, the polyanionic compound may be Li a A e Mn 1-f B f P 1-g C g O 4-n D n , wherein, A includes one or more elements selected from Zn, Al, Na, K, Mg, Nb, Mo and W; B includes one or more elements selected from Ti, V, Zr, Fe, Ni, Mg, Co, Ga, Sn, Sb, Nb and Ge; C includes one or more elements selected from B, S, Si and N; D includes one or more elements selected from S, F, Cl and Br; a is selected from the range of 0.9 to 1.1, e is selected from the range of 0.001 to 0.1, f is selected from the range of 0.001 to 0.5, g is selected from the range of 0.001 to 0.1, n is selected from the range of 0.001 to 0.1, and the second positive electrode active material is electrically neutral.

[0161] During the charge and discharge process of the battery, the insertion and extraction and consumption of Li will occur, and the molar content of Li is different when the battery is discharged to different states. In the listing of the positive electrode materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. When the positive electrode material is applied to the battery system and undergoes charge and discharge cycles, the molar content of Li will change.

[0162] In the listing of the positive electrode materials in the present application, the molar content of O is only the theoretical state value, and the release of oxygen from the lattice will cause the molar content of oxygen to change, and the actual molar content of O will fluctuate.

[0163] In some embodiments, the positive electrode film layer may further optionally include a binder. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resin.

[0164] In some embodiments, the positive electrode film layer may further optionally include a conductive agent. As an example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0165] In some embodiments, the positive electrode plate can be prepared in the following manner: dispersing the components for preparing the positive electrode plate, such as the positive electrode active material, conductive agent, binder, and any other components, in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry on the positive electrode current collector, and after processes such as drying and cold pressing, the positive electrode plate can be obtained.

[0166] [Negative electrode plate]

[0167] In some embodiments of the present application, in the film layer, the specific type of the negative electrode active material is not limited, and active materials known in the art that can be used for the negative electrode of a sodium ion battery can be adopted, and those skilled in the art can select according to actual needs. As an example, the negative electrode active material may include, but is not limited to, carbon materials, and the carbon materials include at least one of, but are not limited to, hard carbon, soft carbon, amorphous carbon, nanostructured carbon materials, etc., and these materials can all be obtained through commercial channels.

[0168] Exemplarily, the negative electrode active material may include one or more of hard carbon, soft carbon, artificial graphite, and natural graphite.

[0169] In some embodiments, the current collector of the negative electrode plate generally may further include a current collector body and a bottom coating. The bottom coating can be provided on at least one side of the current collector body. The bottom coating basically does not contain the negative electrode active material and may include a small amount of carbon material, but the carbon material forms a thin coating thickness and cannot play the role of the negative electrode active material. In this embodiment, the negative electrode plate can be a plate without a negative electrode active material layer. For the negative electrode plate without a negative electrode active material layer, when the current collector of the negative electrode plate does not include a bottom coating, the film layer can be provided on the surface of at least one side of the current collector; when the current collector of the negative electrode plate includes a bottom coating, the film layer can be provided on the surface of the side of the bottom coating away from the current collector.

[0170] In some embodiments, the film layer may further include a binder, which is used to fix the additive on the negative electrode sheet. Among them, the type of the binder is not particularly limited, and those skilled in the art can flexibly select according to actual needs.

[0171] [Electrolyte]

[0172] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalato)borate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0173] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone.

[0174] In some embodiments, the electrolyte may optionally further include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and may also include additives that can improve certain battery performance, such as additives for improving the overcharge performance of the battery, additives for improving the high-temperature or low-temperature performance of the battery, etc.

[0175] [Separator]

[0176] In some embodiments, the present application does not particularly limit the type of the separator, and any well-known porous structure separator with good chemical stability and mechanical stability can be selected.

[0177] In some embodiments, the material of the separator may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0178] In some embodiments, the battery cell may include an outer package. The outer package can be used to encapsulate the above electrode assembly and electrolyte.

[0179] In some embodiments, the outer package of the battery cell may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc. The outer package of the battery cell may also be a soft package, such as a pouch soft package. The material of the soft package may be plastic, and as plastics, polypropylene, polybutylene terephthalate, and polybutylene succinate, etc. can be listed.

[0180] The shape of the battery cell of the present application can be cylindrical, square shell or any other shape. Exemplarily, Figure 9 is a battery cell 5 with a square shell structure as an example.

[0181] In some embodiments, referring to Figure 10 , the outer package includes a housing 51 and a cover plate 53. Among them, the housing 51 may include a bottom plate and side plates connected to the bottom plate, and the bottom plate and the side plates enclose a receiving cavity. The housing 51 has an opening communicating with the receiving cavity, and the cover plate 53 can be covered on the opening to close the receiving cavity. The positive electrode plate, the negative electrode plate and the separator can be formed into an electrode assembly 52 by a winding process or a stacking process. The electrode assembly 52 is encapsulated in the receiving cavity. The electrolyte is infiltrated in the electrode assembly 52. The number of electrode assemblies 52 included in the battery cell 5 can be one or more, and those skilled in the art can select according to specific actual needs.

[0182] Some embodiments of the present application provide a battery, and the battery includes the battery cell provided in any of the foregoing embodiments.

[0183] In the above technical solution, the term "battery" can be a battery module or a battery pack.

[0184] Exemplarily, in some embodiments, the battery cells can be assembled into a battery module, and the number of battery cells included in the battery module can be one or more. Those skilled in the art can select the specific number according to the application and capacity of the battery module.

[0185] Figure 11 is a battery module 4 as an example. Referring to Figure 11 , in the battery module 4, a plurality of battery cells 5 can be arranged in sequence along the length direction of the battery module 4. Of course, they can also be arranged in any other way. Further, the plurality of battery cells 5 can be fixed by fasteners.

[0186] Optionally, the battery module 4 may further include a housing having a receiving space, and a plurality of battery cells 5 are received in the receiving space.

[0187] In some embodiments, the above battery module can be further assembled into a battery pack, and the number of battery modules included in the battery pack can be one or more. Those skilled in the art can select the specific number according to the application and capacity of the battery pack.

[0188] Figure 12 and Figure 13 is a battery pack 1 as an example. Referring to Figure 12 and Figure 13, a battery pack 1 may include a battery box and a plurality of battery modules 4 disposed in the battery box. The battery box includes an upper box body 2 and a lower box body 3. The upper box body 2 can be covered on the lower box body 3 to form a closed space for accommodating the battery modules 4. The plurality of battery modules 4 can be arranged in the battery box in any manner.

[0189] A second aspect of the embodiments of the present application provides an electrical device.

[0190] The electrical device includes at least one of the battery cells, battery modules, or battery packs provided by the present application. The battery cells, battery modules, or battery packs can be used as the power source of the electrical device or as the energy storage unit of the electrical device. The electrical device can include mobile devices (such as mobile phones, laptop computers, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships, satellites, energy storage systems, etc., but are not limited thereto.

[0191] As the electrical device, battery cells, battery modules, or battery packs can be selected according to its usage requirements.

[0192] Figure 14 is an electrical device as an example. The electrical device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc. To meet the high-power and high-energy-density requirements of the electrical device for the battery, a battery pack or a battery module can be used.

[0193] Another example of the device can be a mobile phone, a tablet computer, a laptop computer, etc. This device usually requires thin and light, and a battery can be used as the power source.

[0194] The above-described embodiments are part of the embodiments of the present application, rather than all embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing; An electrode assembly, accommodated in the housing; An electrolyte, accommodated in the housing; A liquid absorption assembly, the liquid absorption assembly being disposed on at least a part of the surface of the electrode assembly, the liquid absorption assembly including a substrate layer and a liquid absorption layer, the liquid absorption layer being connected to at least one surface of the substrate layer along the thickness direction of the substrate layer and being used for absorbing the electrolyte, and the impact strength of the substrate layer being greater than that of the liquid absorption layer.

2. The battery cell according to claim 1, wherein The electrode assembly includes a main body region and a thinned region along a first direction, the thinned region being connected to the main body region, and the thickness of the electrode tab of the electrode assembly in the main body region being greater than the thickness of the electrode tab of the electrode assembly in the thinned region; At least a part of the liquid absorption assembly is disposed in the thinned region.

3. The battery cell according to claim 2, wherein The liquid absorption assembly is disposed in the main body region and the thinned region.

4. The battery cell according to claim 3, wherein The liquid absorption assembly includes a first liquid absorption assembly and a second liquid absorption assembly, the first liquid absorption assembly being disposed in the thinned region; the first liquid absorption assembly includes a first liquid absorption layer; The second liquid absorption assembly is disposed in the main body region; the second liquid absorption assembly includes a second liquid absorption layer; The thickness of the first liquid absorption layer is greater than the thickness of the second liquid absorption layer.

5. The battery cell according to claim 2, wherein The thinned region is located at the edge of the electrode assembly.

6. The battery cell according to claim 1, wherein The electrode assembly includes an end face; The liquid absorption assembly is disposed on the end face.

7. The battery cell according to any one of claims 1-6, wherein The liquid absorption assembly is disposed between the electrode assembly and the housing; and the substrate layer contacts the housing; the liquid absorption layer contacts the surface of the electrode assembly; the substrate layer is provided with holes.

8. The battery cell according to claim 7, wherein The substrate layer is bonded to the housing.

9. The battery cell according to claim 7, wherein The electrode assembly includes a side face; the liquid absorption assembly is disposed on the side face.

10. The battery cell according to any one of claims 1-9, wherein The thickness of the liquid absorption layer is 50 μm to 100 μm.

11. The battery cell according to any one of claims 1-10, wherein The thickness of the liquid absorption layer is 60 μm to 80 μm.

12. The battery cell according to any one of claims 1-11, wherein The liquid absorption layer is a polystyrene film layer.

13. The battery cell according to any one of claims 1-12, wherein The number of the liquid absorption layers includes a plurality; A glue layer is disposed between the plurality of liquid absorption layers.

14. The battery cell according to claim 13, wherein The thickness of the glue layer is 5 μm to 15 μm.

15. The battery cell according to any one of claims 1-14, wherein The thickness of the substrate layer is 5 μm to 15 μm.

16. The battery cell according to any one of claims 1-15, characterized in that the matrix layer is a polyethylene terephthalate film layer or a thermally conductive silicone layer.

17. The battery cell according to any one of claims 1-16, characterized in that the battery cell is a square shell battery cell.

18. A battery, characterized in that, Comprising the battery cell according to any one of claims 1-17.

19. An electrical device, characterized in that, Comprising the battery cell according to any one of claims 1-17, the battery cell being used for providing electric energy.

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