Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery cell includes: a case including a case wall configured to form an inner cavity of the case; and the battery core assembly is arranged in the inner cavity of the shell. A main containing cavity and an auxiliary containing cavity are formed in an inner cavity of the shell, and the battery cell assembly is arranged in the main containing cavity and is at least partially separated from the shell wall through the auxiliary containing cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In some specific applications, for example, in order to ensure that near space solar unmanned aerial vehicles have a high enough flight altitude, stratospheric airships have enough wind resistance, the specific energy requirement of lithium battery packs is increased to 500 Wh / kg or even higher. Since the specific capacity of carbon materials cannot meet people's requirements for energy density, metal lithium or silicon negative electrodes have the advantage of much higher specific capacity than carbon materials, and therefore are expected to become ideal materials for replacing carbon materials as electrode negative electrodes. However, due to the tens of thousands of Newton or even greater expansion force of lithium metal or silicon negative electrode batteries during the cycle process, and the huge volume shrinkage during discharge, the shell is easily damaged, so the shell needs to be designed to absorb expansion.

[0004] In addition, when there is not enough space left for the expansion of the pole piece inside the battery cell, the pole piece will be extruded from the shell, causing the active material to be extruded, the electrolyte to be extruded, the transport of lithium ions to be severely affected, the polarization of the lithium battery to be increased, and a series of serious problems such as performance degradation, affecting the cycle life and safety performance of the lithium battery. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the present application provides a battery monomer, a battery and a power utilization device to overcome the above problems existing in the prior art.

[0006] One object of the present application is to provide a battery monomer, a battery and a power utilization device which can compensate for the expansion of the battery cell assembly and avoid extrusion of the shell on the battery cell assembly.

[0007] Another object of the present application is to provide a battery monomer, a battery and a power utilization device which can compensate for the mounting gap of the battery cell assembly.

[0008] In a first aspect, the present application provides a battery monomer, characterized in that the battery monomer comprises:

[0009] a shell, the shell comprising a shell wall configured to form an inner cavity of the shell; and

[0010] a battery cell assembly arranged in the inner cavity of the shell;

[0011] The inner cavity of the shell is formed with a main accommodating cavity and a secondary accommodating cavity, the battery cell assembly is arranged in the main accommodating cavity and is at least partially spaced apart from the shell wall via the secondary accommodating cavity.

[0012] By providing the secondary accommodating cavity, there is a certain gap between the battery cell assembly and the shell wall of the shell, so that when the battery cell assembly expands, it can expand towards the gap, so that the gap between the battery cell assembly and the shell wall of the shell can absorb the expansion of the battery cell assembly. Therefore, according to the scheme of the present application, sufficient expansion allowance is provided under the condition of ensuring the capacity of the lithium battery, so as to avoid the electrolyte in the battery cell being squeezed out to affect the transmission of lithium ions, thereby avoiding problems such as capacity decline and lithium precipitation, and improving the cycle life and safety performance of the lithium battery. It can effectively provide better directional pressure relief capability for high-energy-density lithium metal batteries, provide buffer space to solve the volume expansion of lithium metal batteries due to lithium deposition, avoid the loss of battery cell structure and shell damage caused by the volume expansion stress, and the poor wetting of the chemical system under high stress and the capacity attenuation of the battery.

[0013] In some embodiments of the battery monomer, a partition is formed between the main accommodating cavity and the secondary accommodating cavity, and the partition is configured to separate the inner cavity of the shell into the main accommodating cavity and the secondary accommodating cavity.

[0014] The inner cavity of the shell is formed with a main accommodating cavity and a secondary accommodating cavity, the battery cell assembly is arranged in the main accommodating cavity and is at least partially spaced apart from the shell wall via the secondary accommodating cavity.

[0015] In some embodiments of the battery monomer, a partition is formed in the inner cavity of the shell, and the partition is attached to the shell wall to separate the inner cavity of the shell into the main accommodating cavity and the secondary accommodating cavity.

[0016] By attaching the partition to the shell wall to form the secondary accommodating cavity, the main accommodating cavity and the secondary accommodating cavity can be separated while achieving sealing between the main accommodating cavity and the secondary accommodating cavity.

[0017] In some embodiments of the battery monomer, the partition includes an attachment portion and a main body, the attachment portion is at the periphery of the partition and is configured to be attached to the shell wall, and the main body forms the secondary accommodating cavity with the shell wall.

[0018] By attaching the partition to the shell wall by attaching the attachment portion of the partition to the shell wall, a simple structure, easy assembly and cost-saving way is provided to form the main accommodating cavity and the secondary accommodating cavity in the inner cavity of the shell. The attachment of the attachment portion to the shell wall also ensures the separation and sealing between the secondary accommodating cavity and the main accommodating cavity.

[0019] In some embodiments of the battery cell, the separator comprises an attachment portion, a redundancy portion, and a main body, the attachment portion is at a periphery of the separator and is configured to be attached to the housing wall, the redundancy portion is adjacent to the attachment portion and between the attachment portion and the main body, wherein the redundancy portion and the main body form the secondary accommodation cavity with the housing wall.

[0020] By adopting the design of the redundancy portion, the capacity of the secondary accommodation cavity to absorb the expansion of the battery cell assembly can be enhanced, and the secondary accommodation cavity can be prevented from being damaged when being pressed to cause sealing failure.

[0021] In some embodiments of the battery cell, the redundancy portion has a bellows structure, a stepped structure, or a folded structure.

[0022] By adopting the redundancy structure in the form of a bellows structure, a stepped structure, or a folded structure, effective redundancy characteristics can be provided in a simple manner, and the capacity of the secondary accommodation cavity to absorb the expansion of the battery cell assembly can be enhanced.

[0023] In some embodiments of the battery cell, the redundancy portion has a redundancy length of 0.5 mm to 5 mm.

[0024] In some embodiments of the battery cell, the separator and the housing wall are composed of the same metal material.

[0025] The separator and the housing wall are composed of the same metal material, which can avoid corrosion between dissimilar metals and prevent the separator from being separated from the housing wall to cause separation and sealing failure.

[0026] In some embodiments of the battery cell, the ratio of the length of the secondary accommodation cavity to the length of the inner cavity of the housing is in the range of 0.85 to 0.99, and the ratio of the height of the secondary accommodation cavity to the height of the inner cavity of the housing is in the range of 0.85 to 0.99.

[0027] In some embodiments of the battery cell, the ratio of the width of the main accommodation cavity to the width of the inner cavity of the housing is in the range of 0.75 to 0.95.

[0028] By setting the above size relationship, the lithium ion battery is provided with sufficient expansion allowance in the housing to ensure that the electrolyte in the lithium battery is not squeezed out during circulation, thereby solving the interface problem or performance deterioration caused by poor battery wetting.

[0029] In some embodiments of the battery cell, a compensation absorption structure is arranged in the secondary accommodation cavity, and the compensation absorption structure is configured to compensate for the installation gap of the battery cell assembly in the inner cavity of the housing and absorb the expansion of the battery cell assembly.

[0030] By setting the compensation absorption structure in the auxiliary accommodating cavity, the installation gap of the battery cell assembly in the inner cavity of the shell and the expansion of the battery cell assembly can be compensated, the shell gap during assembly is filled, the lithium metal is deposited under stress, and the problems of poor lithium deposition interface and lithium dendrite growth caused by no stress deposition of lithium metal are avoided. In particular, the lithium metal deposition under stress has better deposition, the battery shell realizes low group margin assembly into the shell, and realizes stress cycle after entering the shell.

[0031] In some embodiments of the battery cell, the compensation absorption structure includes an outer shell and a core filled in the outer shell.

[0032] The core-shell structure is beneficial to compensate the compression durability defects of the thermal expansion material by the better durability compression and rebound performance of the core material.

[0033] In some embodiments of the battery cell, the compensation absorption structure has a softening temperature in the range of 60-110℃ and a melting temperature in the range of 125-135℃.

[0034] In some embodiments of the battery cell, the compensation absorption structure has a compression rate in the range of 5-80%, wherein the corresponding compression force is in the range of 0.05-1.5 Mpa under a compression rate of 5-55%, and the corresponding compression force is in the range of 1.0-4.0 Mpa under a compression rate of 55-80%.

[0035] In some embodiments of the battery cell, the compensation absorption structure has a flatness in the range of ±0.3mm.

[0036] In a second aspect, the application provides a battery comprising the battery cell in the above embodiments.

[0037] In a third aspect, the application provides an electric device comprising the battery in the above embodiments, wherein the battery is used to provide electric energy.

[0038] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0039] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the application. Moreover, the same reference numbers are used throughout the drawings to represent the same components. In the drawings:

[0040] Figure 1 is a structural schematic view of a vehicle according to some embodiments of the present application;

[0041] Figure 2 is an exploded structural schematic view of a battery according to some embodiments of the present application;

[0042] Figure 3 is an exploded structural schematic view of a battery cell according to some embodiments of the present application;

[0043] Figure 4 is a schematic view of a housing of a battery cell according to some embodiments of the present application;

[0044] Figure 5 is a sectional view taken along line I-I in Figure 4 ;

[0045] Figure 6 is an enlarged view of portion A in Figure 5 ;

[0046] Figure 7 is a sectional view taken along line II-II in Figure 4 ;

[0047] Figure 8 is an enlarged view of portion B in Figure 7 .

[0048] Reference signs in the detailed description of the embodiments are as follows:

[0049] vehicle 1000;

[0050] battery 100, controller 200, motor 300;

[0051] box 10, first portion 11, second portion 12;

[0052] battery cell 20, end cover 21, electrode terminal 21a, housing 22, core assembly 23, tab 23a, liquid bag 24;

[0053] housing wall 222, bottom wall 224, inner cavity 226, longitudinal wall 222A, transverse wall 222B;

[0054] main accommodating cavity 32, auxiliary accommodating cavity 34;

[0055] partition 40, attachment portion 41, main body 42, redundancy portion 43;

[0056] compensation absorption structure 50. DETAILED DESCRIPTION

[0057] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0060] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0062] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system such as hydroelectric power station, thermal power station, wind power station and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0066] In some specific applications, for example, in order to ensure that the near space solar unmanned aerial vehicle has a high enough flight altitude, the stratosphere airship has enough wind resistance, the specific energy requirement of lithium battery pack is increased to 500 Wh / kg or even higher. Since the specific capacity of carbon material cannot meet the requirement of energy density, metal lithium or silicon negative electrode has the advantage of much higher specific capacity than carbon material, and therefore is expected to become an ideal material for replacing carbon material as electrode negative electrode. However, due to the expansion force of hundreds of kilonewtons or even more of lithium metal or silicon negative electrode battery during the cycle process, the shell is easily damaged, so the shell needs to be designed to absorb the expansion.

[0067] When there is not enough space left for the expansion of the pole piece inside the battery cell, the pole piece will be extruded from the shell, which will cause the active material to be extruded, the electrolyte to be extruded, the transmission of lithium ions to be seriously affected, the polarization of lithium battery to be increased, and a series of serious problems such as performance degradation, which will affect the cycle life and safety performance of lithium battery.

[0068] Therefore, the battery cell provided in the application is designed to make the cell assembly not directly contact the wall of the shell but be spaced apart from the shell wall by a certain gap when the cell assembly is inserted into the inner cavity of the shell, and the expansion of the cell assembly is absorbed through the gap. That is, because the cell assembly and the shell wall are spaced apart, there is a certain expansion space to absorb the expansion of the cell assembly.

[0069] Based on such assumption, the application provides a main accommodating cavity and a secondary accommodating cavity in the shell of the battery cell, the cell assembly can be inserted into the main accommodating cavity, and the secondary accommodating cavity is spaced apart from the shell wall to absorb the expansion of the cell assembly. When the cell assembly expands, it will deform towards the secondary accommodating cavity to avoid contacting the shell wall and being extruded by the shell wall.

[0070] The secondary accommodating cavity can also be provided with a heat-expanding elastic material, which can be attached to the cell assembly to compensate for the installation gap of the cell assembly, and can also absorb the expansion of the cell assembly by relying on elasticity.

[0071] The battery cell disclosed in the embodiments of the application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery cell and the battery disclosed in the application, so that the battery performance stability and the battery life can be improved by alleviating and automatically adjusting the deterioration of the cell expansion force.

[0072] The embodiments of the application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0073] The following embodiments are described with reference to a vehicle 1000 as an example of an electric device of an embodiment of the application for convenience of description.

[0074] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0075] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0076] Please refer to Figure 2 , Figure 2 An exploded view of the battery 100 is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a containing space for containing the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, the first part 11 being covered on the open side of the second part 12 to jointly define the containing space with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be various shapes, such as a cylinder, a cuboid, etc.

[0077] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0078] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0079] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0080] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used for electrical connection with cell assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0081] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0082] The cell assembly 23 is the component in the battery cell 100 where the electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. The cell assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals to form a current loop.

[0083] exist Figure 3 In the illustrated embodiment, the battery cell 20 includes a housing 22, at least one cell assembly 23, and at least one enclosed liquid bladder 24. The housing 20 is filled with electrolyte. The at least one cell assembly 23 is disposed within the housing 22. The at least one enclosed liquid bladder 24 contains electrolyte. The liquid bladder 24 is disposed within the housing 22 and is positioned at least corresponding to the sidewall of the cell assembly 23. However, Figure 3 The embodiments shown are not limiting, but exemplary. Those skilled in the art will understand that in some embodiments, the battery cell 20 may not include the liquid bladder 24, or the battery cell 20 may include only one cell assembly 23.

[0084] For ease of description and clarity, the coordinate system XYZ is indicated in the relevant figures below. Here, X represents the length direction of the battery cell 20, also known as the first direction or longitudinal direction; Y represents the width direction of the battery cell 20, also known as the second direction or transverse direction; and Z represents the height direction of the battery cell 20, also known as the third direction or vertical direction.

[0085] Reference Figures 3 to 8 , Figures 4 to 8 FIG. 1 is a schematic diagram of a battery module 20 according to some embodiments of the present application. The battery module 20 can include a housing 22 and an electrode assembly 23. The electrode assembly 23 can be accommodated in the housing 22. The housing 22 can have a cuboid shape. The electrode assembly 23 can be accommodated in a main accommodation cavity 32 of the housing 22 and at least partially spaced apart from a housing wall 222 of the housing 22 via a sub-accommodation cavity 34.

[0086] As described above, the battery module 20 can include the housing 22 and the electrode assembly 23 accommodated in the housing 22. In the illustrated embodiment, the housing 22 is shown to have a cuboid shape, but those skilled in the art can understand that the housing 22 can be any other suitable shape to meet the needs of practical applications. The following is described by way of example with the cuboid-shaped housing 22 for ease of description, and the general principles of the present application can also be applied to other shapes of the housing 22.

[0087] As shown, the housing 22 can include the housing wall 222 and a bottom wall 224. The housing wall 222 forms an inner cavity 226 of the housing 22, the bottom of which is closed by the bottom wall 224, and the top of which can be open. The open top is closed by the aforementioned end cover 21, so that the inner cavity 226 forms a closed space to package the electrode assembly 23 within the housing 22.

[0088] In the case where the housing 22 has a cuboid shape, the housing wall 222 can include two longitudinal walls 222A extending in parallel with the first direction and perpendicular to the second direction, and two transverse walls 222B extending perpendicular to the first direction and in parallel with the second direction. The two longitudinal walls 222A are arranged opposite to each other in the second direction, and the two transverse walls 222B are arranged opposite to each other in the first direction. The two longitudinal walls 222A and the two transverse walls 222B are alternately connected to each other to define the inner cavity 226 of the housing 22 together with the end cover 21 and the bottom wall 224. The electrode assembly 23 can be inserted into the inner cavity 226 of the housing 22 from the open top of the housing 22, and then the open top is closed with the end cover 21 to package the electrode assembly 23 within the housing 22.

[0089] According to some embodiments of this application, a main receiving cavity 32 and a secondary receiving cavity 34 may be formed in the inner cavity 226 of the housing 22. In some embodiments, the main receiving cavity 32 and the secondary receiving cavity 34 may constitute the inner cavity 226 of the housing 22, that is, the internal space of the inner cavity 226 of the housing 22 is divided into the main receiving cavity 32 and the secondary receiving cavity 34. The main receiving cavity 32 may be configured to accommodate the battery cell assembly 23, which is arranged within the main receiving cavity 32 when inserted into the inner cavity 226 of the housing 22. The secondary receiving cavity 34 may be formed as a hollow structure, that is, the secondary receiving cavity 34 has an internal space, and may be configured to at least partially space the battery cell assembly 23 from the housing wall 222, that is, when the battery cell assembly 23 is inserted into the inner cavity 226 of the housing 22, at least a portion of the battery cell assembly 23 is not in contact with the housing wall 222.

[0090] By providing a secondary accommodating cavity 34, a certain gap exists between the cell assembly 23 and the shell wall 222 of the housing 22. Thus, when the cell assembly 23 expands, it expands towards this gap, allowing the gap to absorb the expansion of the cell assembly 23. Therefore, according to the solution of this application, sufficient expansion margin is provided while ensuring the capacity of the lithium battery, preventing the electrolyte inside the cell from being squeezed out and affecting lithium ion transport. This avoids problems such as capacity reduction and lithium plating, and improves the cycle life and safety performance of the lithium battery.

[0091] In some embodiments, as shown, the secondary accommodating cavity 34 partially covers the housing wall 222 to at least partially space the cell assembly 23 from the housing wall 222. Figures 5 to 8 As shown, the secondary accommodating cavity 34 can cover the longitudinal wall 222A in the housing wall 222, specifically, it can partially or completely cover the longitudinal wall 222A. In the illustrated embodiment, the secondary accommodating cavity 34 covers most of the longitudinal wall 222A, leaving only portions near the transverse wall 222B, the top of the opening, and the bottom wall 224 uncovered. In this case, the cell assembly 23 can be substantially completely spaced from the longitudinal wall 222A and will not be compressed by the longitudinal wall 222A during expansion. Meanwhile, even if the cell assembly 23 may contact the bottom wall 224 and the end cap 21 covering the top of the opening, when the cell assembly 23 expands, due to the presence of the secondary accommodating cavity 34, the cell assembly 23 will still preferentially deform towards the space where the secondary accommodating cavity 34 is located to absorb the expansion of the cell assembly 23.

[0092] In some embodiments, the sub- accommodation cavity 34 can be arranged to cover at least a portion of the shell wall 222 of the shell 22, for example, to cover one or more of the two longitudinal walls 222A and the two transverse walls 222B, for example, to cover only the transverse walls 222B, to cover one longitudinal wall 222A and one transverse wall 222B, etc. The coverage range of the sub- accommodation cavity 34 can be determined according to the actual situation of the battery cell 20, for example, based on the space requirement of the inner cavity 226, the swelling characteristics of the cell assembly 23, etc.

[0093] The battery cell 20 according to the present application is provided with a sub- accommodation cavity 34 to space the cell assembly 23 from the shell wall 222, which can effectively provide better directional pressure relief capability for high energy density lithium metal batteries, provide buffer space to solve the volume expansion of lithium metal batteries due to lithium deposition, avoid the loss of cell structure and damage to the shell caused by the volume expansion stress of lithium metal batteries, and the poor wettability of the chemical system under high stress and the capacity attenuation of the battery.

[0094] According to some embodiments of the present application, a partition 40 is formed between the main accommodation cavity 32 and the sub- accommodation cavity 34, and the partition 40 is configured to separate the inner cavity 226 of the shell 22 into the main accommodation cavity 32 and the sub- accommodation cavity 34.

[0095] As shown in Figure 5 and Figure 7 , Figure 5 is a sectional view taken along line I–I in Figure 4 , Figure 7 is a sectional view taken along line II–II in Figure 4 . The partition 40 can be arranged between the main accommodation cavity 32 and the sub- accommodation cavity 34 to separate the main accommodation cavity 32 and the sub- accommodation cavity 34, so as to facilitate the insertion of the cell assembly 23 into the main accommodation cavity 32 while avoiding the sub- accommodation cavity 34 during assembly. By arranging the partition 40, the inner cavity 226 of the shell 22 can be separated into the main accommodation cavity 32 and the sub- accommodation cavity 34.

[0096] By separating the inner cavity 226 of the shell 22 into the main accommodation cavity 32 and the sub- accommodation cavity 34 with the partition 40, the main accommodation cavity 32 and the sub- accommodation cavity 34 can be conveniently formed in the inner cavity 226 of the shell 22 without additional modification to the structure of the shell 22, simplifying the structure and reducing the cost.

[0097] According to some embodiments of the present application, the inner cavity 226 of the shell 22 is provided with a partition 40, and the partition 40 is attached to the shell wall 222 to separate the inner cavity 226 of the shell 22 into the main accommodation cavity 32 and the sub- accommodation cavity 34.

[0098] Also as shown in Figure 5 and Figure 7As shown, the partition 40 can be attached to the housing wall 222 within the inner cavity 226 of the housing 22, thereby forming a secondary receiving cavity 34 between the partition 40 and the housing wall 222 within its attachment range. In the illustrated embodiment, two partitions 40 are attached to two longitudinal walls 222A at positions near the transverse wall 222B, the top of the opening, and the bottom wall 224, respectively, thereby forming a secondary receiving cavity 34 between the partition 40 and the corresponding longitudinal wall 222A. Specifically, two secondary receiving cavities 34 are formed. With the secondary receiving cavities 34 formed by the partition 40 and the attached housing wall 222, the remaining portion of the internal space of the inner cavity 226 of the housing 22 forms the primary receiving cavity 32, and the primary receiving cavity 32 and the secondary receiving cavity 34 are separated by the partition 40.

[0099] By attaching a separator 40 to the housing wall 222 to form a secondary accommodating cavity 34, a seal between the primary accommodating cavity 32 and the secondary accommodating cavity 34 can be achieved while separating the primary accommodating cavity 32 and the secondary accommodating cavity 34.

[0100] According to some embodiments of this application, the partition 40 includes an attachment portion 41 and a body 42, the attachment portion 41 being located at the periphery of the partition 40 and configured to be attached to the housing wall 222, wherein the body 42 and the housing wall 222 form a secondary accommodating cavity 34.

[0101] like Figure 6 and Figure 8 As shown, Figure 6 yes Figure 5 An enlarged view of part A in the image. Figure 8 yes Figure 7 An enlarged view of part B in the diagram. In some embodiments, the partition 40 may include an attachment portion 41 and a body 42. The attachment portion 41 may be located at the periphery of the partition 40, that is, the peripheral portion of the partition 40 may be formed as the attachment portion 41, surrounding the body 42 of the partition 40. The attachment portion 41 may be configured to be attached to the housing wall 222, for example, by welding, bonding, or other connection methods, to attach the partition 40 to the housing wall 222. When attaching the partition 40 to the housing wall 222, only the attachment portion 41 may be attached to the housing wall 222, so that the body 42 does not contact the housing wall 222, thereby forming an internal space as a secondary accommodating cavity 34 between the body 42 and the housing wall 222.

[0102] By attaching the separator 40 to the housing wall 222 using the attachment portion 41, a simple, easy-to-assemble, and cost-effective method is provided to form the main receiving cavity 32 and the secondary receiving cavity 34 in the inner cavity 226 of the housing 22. The attachment of the attachment portion 41 to the housing wall 222 also ensures the separation and sealing between the secondary receiving cavity 34 and the main receiving cavity 32.

[0103] According to some embodiments of the present application, the partition 40 comprises an attachment portion 41 at a periphery of the partition 40 and configured to be attached to the housing wall 222, a redundancy portion 43 adjacent to the attachment portion 41 and between the attachment portion 41 and a main body 42, wherein the redundancy portion 43 and the main body 42 form the sub-receiving cavity 34 with the housing wall 222.

[0104] As shown in Figs. 1 and 2, in some embodiments, the partition 40 can further comprise a redundancy portion 43 between the attachment portion 41 and the main body 42. The redundancy portion 43 can be adjacent to the attachment portion 41 and surround the main body 42, such that the redundancy portion 43 forms a connecting portion between the attachment portion 41 and the main body 42. When the battery cell assembly 23 expands, the partition 40 is deformed towards the sub-receiving cavity 34 and is pressed, and the redundancy portion 43 can buffer the pressing at this time. Figure 6 Figure 8 By adopting the design of the redundancy portion 43, the capacity of the sub-receiving cavity 34 to absorb the expansion of the battery cell assembly 23 can be enhanced, and the sub-receiving cavity 34 can be prevented from being damaged and causing sealing failure when being pressed.

[0105] According to some embodiments of the present application, the redundancy portion 43 has a bellows structure, a stepped structure or a folded structure.

[0106] As shown in Figs. 1 and 2, in some embodiments, the redundancy portion 43 can have various forms of redundancy structures to provide redundancy effects, such as a bellows structure, a stepped structure or a folded structure, or any other suitable redundancy structure. As shown in the figures, when the sub-receiving cavity 34 is pressed, the main body 42 of the partition 40 can move in a second direction (Y direction), and accordingly, the redundancy portion 43 can also move in the second direction to increase the movement range of the main body 42 of the partition 40 and enhance the capacity of the sub-receiving cavity 34 to absorb the expansion of the battery cell assembly 23.

[0107] By adopting the redundancy structure in the form of a bellows structure, a stepped structure or a folded structure, effective redundancy characteristics can be provided in a simple manner, and the capacity of the sub-receiving cavity 34 to absorb the expansion of the battery cell assembly 23 can be enhanced. Figure 6 Figure 8 According to some embodiments of the present application, the redundancy portion 43 has a redundancy length of 0.5 millimeters to 5 millimeters.

[0108] According to some embodiments of the present application, the redundancy portion 43 has a redundancy length of 0.5 millimeters to 5 millimeters.

[0109] According to some embodiments of the present application, the redundancy portion 43 has a redundancy length of 0.5 millimeters to 5 millimeters.

[0110] ​​In some embodiments, the redundancy portion 43 has a redundancy length in a range from 0.5 mm to 5 mm, for example, in a range from 0.8 mm to 4 mm, in a range from 1 mm to 3 mm, in a range from 1.5 mm to 2 mm. The redundancy length of the redundancy portion 4 can be determined according to the actual situation of the battery cell 20, for example, based on the absorption capacity requirement of the sub- accommodating cavity 34, the expansion characteristics of the cell assembly 23, etc.

[0111] According to some embodiments of the present application, the separator 40 and the shell wall 222 are composed of the same metal material.

[0112] In some embodiments, the shell 22 (for example, the shell wall 222) of the battery cell 20 can be made of one of aluminum, steel, iron, titanium, nickel, carbon fiber or an alloy corresponding thereto, and the separator 40 can be made of aluminum foil, steel foil, iron foil, titanium foil, nickel foil or polymer film, rubber film, etc. When the shell 22 (for example, the shell wall 222) and the separator 40 are both made of metal materials, the separator 40 and the shell wall 222 are composed of the same metal material.

[0113] The separator 40 and the shell wall 222 are composed of the same metal material, which can avoid corrosion between dissimilar metals and prevent the separator 40 from being separated from the shell wall 222 to cause separation and sealing failure.

[0114] According to some embodiments of the present application, the ratio of the length of the sub- accommodating cavity 34 to the length of the inner cavity 226 of the shell 22 is in a range from 0.85 to 0.99, and the ratio of the height of the sub- accommodating cavity 34 to the height of the inner cavity 226 of the shell 22 is in a range from 0.85 to 0.99.

[0115] The length of the sub- accommodating cavity 34 is the dimension of the sub- accommodating cavity 34 measured in the first direction (length direction), and the length of the inner cavity 226 of the shell 22 is the dimension of the inner cavity 226 measured in the first direction (length direction). The height of the sub- accommodating cavity 34 is the dimension of the sub- accommodating cavity 34 measured in the third direction (height direction), and the height of the inner cavity 226 of the shell 22 is the dimension of the inner cavity 226 measured in the third direction (height direction). In some embodiments, the ratio of the length of the sub- accommodating cavity 34 to the length of the inner cavity 226 of the shell 22 is in a range from 0.85 to 0.99, for example, in a range from 0.965 to 0.985, for example, 0.980. In some embodiments, the ratio of the height of the sub- accommodating cavity 34 to the height of the inner cavity 226 of the shell 22 is in a range from 0.85 to 0.99, for example, in a range from 0.955 to 0.985, for example, 0.975.

[0116] According to some embodiments of this application, the ratio of the width of the main accommodating cavity 32 to the width of the inner cavity 226 of the housing 22 is in the range of 0.75 to 0.95.

[0117] Similarly, the width of the main accommodating cavity 32 is the dimension of the main accommodating cavity 32 measured along the second direction (width direction), and the width of the inner cavity 226 of the housing 22 is the dimension of the inner cavity 226 measured along the second direction (width direction). In some embodiments, the ratio of the width of the main accommodating cavity 32 to the width of the inner cavity 226 of the housing 22 can be in the range of 0.75 to 0.95, for example, in the range of 0.80 to 0.90, in the range of 0.82 to 0.88, and for example, 0.85. In the illustrated embodiment, when both longitudinal walls 222A are covered with secondary accommodating cavities 34, the difference between the width of the main accommodating cavity 32 and the width of the inner cavity 226 of the housing 22 is approximately equal to the width of the two secondary accommodating cavities 34 along the second direction (width direction).

[0118] By setting the above dimensional relationships, the lithium-ion battery can ensure that the cell assembly has sufficient capacity, while also reserving enough expansion margin inside the casing to ensure that the electrolyte in the lithium battery is not squeezed out during cycling, thereby solving the interface problem or performance degradation caused by poor battery wetting.

[0119] According to some embodiments of this application, a compensation absorption structure 50 is provided in the secondary accommodating cavity 34. The compensation absorption structure 50 is configured to compensate for the installation gap of the battery cell assembly 23 in the inner cavity 226 of the housing 22 and to absorb the expansion of the battery cell assembly 23.

[0120] like Figures 5 to 8 As shown, in some embodiments, a compensation absorption structure 50 may be provided or filled within the secondary accommodating cavity 34. As described above, the secondary accommodating cavity 34 may have an internal space. For example, in the case of a partition 40, the secondary accommodating cavity 34 is formed between the main body 42 and the corresponding housing wall 222 by attaching the attachment portion 41 of the partition 40 to the housing wall 222. In this case, an internal space of the secondary accommodating cavity 34 is formed between the main body 42 and the housing wall 222. The compensation absorption structure 50 may be provided within this internal space.

[0121] When the battery cell assembly 23 is inserted into the inner cavity 226 of the housing 22, for example when the battery cell assembly 23 is inserted into the main accommodating cavity 32, in order to facilitate the insertion of the battery cell assembly 23, the size of the battery cell assembly 23 may be smaller than the size of the main accommodating cavity 32, so that a certain installation gap is generated between the battery cell assembly 23 and the separator 40.

[0122] The compensation absorption structure 50 can be made of a thermal expansion elastomer material which can expand when heated and elastically contract when pressed. During the assembly of the battery cell 20, when the compensation absorption structure 50 is arranged into the sub- accommodating cavity 34, it is in an initial state. After the insertion of the cell assembly 23 into the main accommodating cavity 32, the compensation absorption structure 50 can be heated to expand the thermal expansion elastomer material constituting the compensation absorption structure 50, so as to, for example, push the partition 40 to move outward to abut or fit against the cell assembly 23, thereby eliminating the installation gap between the cell assembly 23 and the partition 40, so that the assembly of the battery cell 20 is more compact. During the use or detection of the battery cell 20, in the case of expansion of the cell assembly 23, the expanded cell assembly 23 will push the partition 40 to move in the opposite direction, at this time, the thermal expansion elastomer material constituting the compensation absorption structure 50 is pressed to elastically contract and deform, so as to absorb the expansion of the cell assembly 23.

[0123] By arranging the compensation absorption structure 50 in the sub- accommodating cavity 34, the installation gap of the cell assembly 23 in the inner cavity 226 of the shell 22 and the expansion of the cell assembly 23 can be compensated, the gap when assembling into the shell is filled, the lithium metal is provided with stress at the initial stage of lithium metal cycle, and the problems of poor lithium deposition interface and lithium dendrite growth caused by the stress-free deposition of lithium metal are avoided. In particular, the lithium metal deposition is better in the case of stress, the battery shell realizes low group margin assembly into the shell, and realizes cycle under stress after assembly into the shell.

[0124] According to some embodiments of the present application, the compensation absorption structure 50 includes an outer shell and a core filled in the outer shell.

[0125] In some embodiments, the compensation absorption structure 50 can be composed of a thermal foaming expanded outer shell and a low thermal expansion elastomer core. The thermal foaming expanded outer shell is formed of, for example, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyacrylate, polyacrylonitrile, polybutadiene, or a copolymer thereof, etc. The outer shell of the thermal plastic resin contains propane, butane, other low-boiling gaseous substances (foaming agent). If the thermal expansion material is heated above the thermal expansion starting temperature, the shell formed of resin softens, and at the same time, the low-boiling gaseous substance contained therein is gasified to expand the shell in a balloon shape. The core low thermal expansion elastomer material is, for example, a foam material (PE foam, PP foam, melamine foam, polyimide foam) or a rubber-based elastomer (silicone rubber / fluororubber / styrene-butadiene rubber, etc.). The core-shell structure is beneficial to compensate for the compression durability defects of the thermal expansion material by the better compression resilience performance of the core material.

[0126] According to some embodiments of the present application, the compensation absorption structure 50 has a softening temperature in the range of 60-110°C and a melting temperature in the range of 125-135°C.

[0127] In some embodiments, the compensation absorption structure 50 has a softening temperature in the range of 60-110°C, for example, in the range of 95-105°C, for example, 100°C. The compensation absorption structure 50 has a melting temperature in the range of 125-135°C, for example, in the range of 128-132°C, for example, 130°C. The thermal expansion elastomer material constituting the compensation absorption structure 50 fills the sub- accommodation cavity 34 after temperature treatment, forming an elastic solid volume with a surface flush with the surface of the tab.

[0128] According to some embodiments of the present application, the compensation absorption structure 50 has a compression rate in the range of 5%-80%, wherein the corresponding compression force in the compression rate of 5%-55% is in the range of 0.05-1.5 Mpa, and the corresponding compression force in the compression rate of 55%-80% is in the range of 1.0-4.0 Mpa.

[0129] In some embodiments, the compensation absorption structure 50 filled in the sub- accommodation cavity 34 is subjected to temperature treatment, that is, the thermal expansion elastomer material constituting the compensation absorption structure 50 after temperature treatment has an elastic performance: actual compression rate range: 5%-80%, wherein the compression force in the compression rate of 5%-55% is in the range of 0.05-1.5 Mpa, and the compression force in the compression rate of 55%-80% is in the range of 1.0-4.0 Mpa. Those skilled in the art can understand that the above-mentioned compression rate and corresponding compression force range are only exemplary and not limited, and any other suitable compression rate and corresponding compression force range is feasible, which can be selected according to the actual battery monomer and its application occasion.

[0130] According to some embodiments of the present application, the compensation absorption structure 50 has a flatness in the range of ±0.3 mm.

[0131] As mentioned above, in the case that the partition 40 is attached to the longitudinal wall 222A at a position close to the transverse wall 222B, the open top and the bottom wall 224, so that the sub- accommodation cavity 34 is formed between the partition 40 and the corresponding longitudinal wall 222A, the internal space formed in the sub- accommodation cavity 34 can have a substantially cuboid shape, for example, in the form of a square block, especially in the case that the electric cell assembly 23 is a square wound cell or a square stacked cell. Thus, the compensation absorption structure 50 filled into the sub- accommodation cavity 34 can have a similar shape, i.e. a cuboid shape, for example, in the form of a square block. In this case, the two faces of the compensation absorption structure 50 parallel to the shell wall 222 and opposite to each other can be planar, and the planarity thereof can be within the range of ±0.3mm.

[0132] In some embodiments, the compensation absorption structure 50 can be in a cubic structure, or in a cubic structure formed by different forms of thermal expansion particle accumulation, such as microspheres, microcubes, cylindrical thermal expansion materials.

[0133] According to some embodiments of the present application, the present application further provides a battery cell comprising any of the above technical solutions.

[0134] According to some embodiments of the present application, the present application further provides a battery comprising any of the above technical solutions.

[0135] The battery can be used in any of the above-mentioned applications.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (20) characterized by, The battery cell (20) comprises: a shell (22) comprising a shell wall (222) configured to form an inner cavity (226) of the shell (22); and an electrode assembly (23) arranged in the inner cavity (226) of the shell (22); wherein the inner cavity (226) of the shell (22) forms a main accommodating cavity (32) and a secondary accommodating cavity (34), the electrode assembly (23) is arranged in the main accommodating cavity (32) and is at least partially spaced apart from the shell wall (222) via the secondary accommodating cavity (34).

2. The battery cell (20) according to claim 1, characterized in that A partition (40) is formed between the main accommodating cavity (32) and the secondary accommodating cavity (34), and the partition (40) is configured to separate the inner cavity (226) of the shell (22) into the main accommodating cavity (32) and the secondary accommodating cavity (34).

3. The battery cell (20) of claim 1, wherein, A partition (40) is arranged in the inner cavity (226) of the shell (22), and the partition (40) is attached to the shell wall (222) to separate the inner cavity (226) of the shell (22) into the main accommodating cavity (32) and the secondary accommodating cavity (34).

4. The battery cell (20) according to claim 3, characterized in that The partition (40) comprises an attachment portion (41) at a periphery of the partition (40) and configured to be attached to the shell wall (222), and a main body (42) forming the secondary accommodating cavity (34) with the shell wall (222).

5. The battery cell (20) of claim 3, wherein, The partition (40) comprises an attachment portion (41) at a periphery of the partition (40) and configured to be attached to the shell wall (222), a redundancy portion (43) adjacent to the attachment portion (41) and between the attachment portion (41) and the main body (42), and the redundancy portion (43) and the main body (42) form the secondary accommodating cavity (34) with the shell wall (222).

6. The battery cell (20) of claim 5, characterized in that The redundancy portion (43) has a bellows structure, a stepped structure, or a folded structure.

7. The battery cell (20) of claim 5, characterized in that The redundancy portion (43) has a redundancy length of 0.5 mm to 5 mm.

8. The battery cell (20) according to any one of claims 2 to 7, characterized in that The partition (40) and the shell wall (222) are composed of the same metal material.

9. The battery cell (20) of claim 1, wherein, A ratio of a length of the secondary accommodating cavity (34) to a length of the inner cavity (226) of the shell (22) is in a range of 0.85 to 0.99, and a ratio of a height of the secondary accommodating cavity (34) to a height of the inner cavity (226) of the shell (22) is in a range of 0.85 to 0.

99.

10. The battery cell (20) of claim 1, wherein, A ratio of a width of the main accommodating cavity (32) to a width of the inner cavity (226) of the shell (22) is in a range of 0.75 to 0.

95.

11. The battery cell (20) according to any one of claims 1 to 7 and 9 to 10, characterized in that, A compensation absorbing structure (50) is arranged in the secondary accommodating cavity (34), and the compensation absorbing structure (50) is configured to compensate for an installation gap of the electrode assembly (23) in the inner cavity (226) of the shell (22) and absorb expansion of the electrode assembly (23).

12. The battery cell (20) of claim 11, characterized in that The compensation absorption structure (50) comprises an outer shell and a core filled in the outer shell.

13. The battery cell (20) of claim 11, characterized in that The compensation absorption structure (50) has a softening temperature in the range of 60-110℃ and a melting temperature in the range of 125-135℃.

14. The battery cell (20) of claim 11, wherein, The compensation absorption structure (50) has a compression rate in the range of 5%-80%, wherein the corresponding compression force is in the range of 0.05-1.5Mpa at the compression rate of 5%-55%, and in the range of 1.0-4.0Mpa at the compression rate of 55%-80%.

15. The battery cell (20) of claim 11, wherein, The compensation absorption structure (50) has a flatness in the range of ±0.3mm.

16. A battery, characterized by The battery comprises the battery cell according to any one of claims 1-15.

17. An electrical device, comprising: The power consuming device comprises the battery according to claim 16, which is used to provide electric energy.

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