CN218215477U

CN218215477U - Battery shell, battery monomer, battery module, battery and power consumption device

Info

Publication number: CN218215477U
Application number: CN202221772265.XU
Authority: CN
Inventors: 朱嘉哲; 徐硕言; 李星; 李振华; 傅寒立; 郭强; 徐佳伟; 张宇
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2023-01-03
Anticipated expiration: 2032-07-11

Abstract

The present invention relates to a battery case, a battery cell, a battery module, a battery, and an electric device, in which a first sidewall and a second sidewall in a thickness direction of an electrode assembly are respectively designed to have different rigidities, i.e., the second sidewall has a greater deformation resistance than the first sidewall. When the battery case is structurally deformed in the thickness direction of the electrode assembly, since the deformation resistance of the first sidewall is weaker than that of the second sidewall, the expansion of the battery case is easily concentrated on the first sidewall, and the degree of expansion deformation on the second sidewall is weakened or eliminated, so that the battery case is deformed in one direction as much as possible, and the risk of deformation and extrusion caused by the fact that the reserved space cannot be accurately controlled due to bidirectional expansion deformation is avoided. So, when battery monomer arranges, only need one-way reservation clearance, can improve battery monomer deformation situation, reduce the extruded risk of deformation, promote battery security performance and cyclicity ability.

Description

Battery case, battery monomer, battery module, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery shell, a battery monomer, a battery module, a battery and an electric device.

Background

The stability of the performance of the battery cell, which is the smallest unit constituting the battery, directly determines the safety performance of the battery. In the process of charge and discharge cycle of the battery monomer, the shell of the battery monomer can expand and deform, and therefore, when the battery monomer is arranged, a gap needs to be reserved between the battery monomer and the battery monomer. But is limited by the structural design defects of the battery monomer, and even if the arrangement gap is reserved, the deformation and extrusion risks of the battery monomer are still easily caused.

Disclosure of Invention

Therefore, a battery case, a single battery, a battery module, a battery and an electric device are needed to be provided, so that the deformation condition of the single battery is improved, the risk of deformation and extrusion is reduced, and the safety performance and the cycle performance of the battery are improved.

In a first aspect, the present application provides a battery case for a battery cell, the battery case having a cavity therein for accommodating an electrode assembly, the battery case including a first side wall and a second side wall, the first side wall and the second side wall being spaced and enclosed at two opposite sides of the cavity in a thickness direction of the electrode assembly; wherein the deformation resistance of the second side wall is greater than that of the first side wall.

In the battery case, the first side wall and the second side wall in the thickness direction of the electrode assembly are respectively designed to have different rigidities, i.e., the second side wall has greater resistance to deformation than the first side wall. When the battery case is structurally deformed in the thickness direction of the electrode assembly, since the deformation resistance of the first sidewall is weaker than that of the second sidewall, the expansion of the battery case is easily concentrated on the first sidewall, and the degree of expansion deformation on the second sidewall is weakened or eliminated, so that the battery case is deformed in one direction as much as possible, and the risk of deformation and extrusion caused by incapability of accurately controlling the reserved space due to bidirectional expansion deformation is avoided. So, when battery monomer arranges, only need one-way reservation clearance, can improve battery monomer deformation situation, reduce the extruded risk of deformation, promote battery security performance and circulation performance.

In some embodiments, the thickness h1 of the first sidewall is less than the thickness h2 of the second sidewall. Therefore, the relation of the deformation resistance between the second side wall and the first side wall is converted into the control of the thicknesses of the second side wall and the first side wall, so that the manufacturing of the battery shell is simplified and the forming efficiency is improved on the premise of realizing effective one-way deformation.

In some embodiments, the thickness h1 of the first sidewall and the thickness h2 of the second sidewall respectively satisfy the following condition: h1 is more than or equal to 0.4mm and less than or equal to 0.8mm, and h2 is more than or equal to 0.8mm and less than or equal to 3mm. So design, the thickness of the first lateral wall of reasonable control and second lateral wall not only realizes effectual one-way deformation, but also reduces the influence to the skirt margin.

In some embodiments, the thickness h1 of the first sidewall and the thickness h2 of the second sidewall respectively satisfy the condition: h1 is more than or equal to 0.5mm and less than or equal to 0.7mm, and h2 is more than or equal to 1.0mm and less than or equal to 1.4mm. Therefore, the thicknesses of the first side wall and the second side wall are further reasonably controlled, and the unidirectional deformation effect can be better realized; meanwhile, the cycle performance of the battery is improved.

In some embodiments, the modulus of elasticity e1 of the material of the first sidewall is less than the modulus of elasticity e2 of the material of the second sidewall. Therefore, the relation of the deformation resistance between the second side wall and the first side wall is converted into the control of the elastic modulus of the materials of the second side wall and the first side wall, and the manufacturing of the battery case is convenient to simplify on the premise of realizing effective unidirectional deformation.

In some embodiments, the condition that the elastic modulus e1 of the material of the first sidewall is less than the elastic modulus e2 of the material of the second sidewall is: e1 is more than or equal to 40Gpa and less than or equal to 100Gpa, e2 is more than or equal to 160Gpa and less than or equal to 240Gpa. So, the material elastic modulus of first lateral wall and second lateral wall of reasonable control can realize effectual one-way deformation, promotes the security performance and the cycling performance of battery.

In some embodiments, the second sidewall includes a body spaced apart from the first sidewall on opposite sides of the chamber in a thickness direction of the electrode assembly, and a reinforcement disposed on the body. So, set up the reinforcement on the body, promote the structural rigidity of second lateral wall, can realize effectual one-way deformation, promote the security performance and the cycling performance of battery.

In some embodiments, on a side of the body facing away from the chamber, at least two reinforcements are provided, and all the reinforcements are arranged at intervals along the first direction; wherein the first direction intersects with a thickness direction of the electrode assembly, and an end of the chamber in the first direction has an opening. Therefore, the reinforcing parts are arranged at intervals along the first direction, so that the structural rigidity of the second side wall is further improved, and the expansion deformation of one side of the second side wall is reduced or eliminated, so that the arrangement of the battery cells is more convenient.

In some embodiments, a ratio η between a spacing D between adjacent two reinforcing members and a height H of the battery case in the first direction satisfies a condition that: eta is more than or equal to 0.1 and less than or equal to 0.3. So, rationally distributed reinforcement structural design, guaranteeing reasonable cost of manufacture under, promote the one-way deformation effect of battery case.

In some embodiments, the stiffener extends in the second direction at the body, an extension length L1 of the stiffener is less than a length L2 of the body in the second direction, and a difference Δ L between the two is: delta L is more than or equal to 2mm and less than or equal to 8mm, wherein the second direction is respectively vertical to the first direction and the thickness direction of the electrode assembly. Therefore, the extension length of the reinforcing part along the second direction is reasonably controlled on the body, so that the reinforcing part is not too long, and the integral structure is not heavy; but also ensures that the second side wall has enough rigidity to effectively realize unidirectional deformation.

In some embodiments, the width W of each stiffener in the first direction is: w is more than or equal to 1mm and less than or equal to 5mm. So, the width size of rational design reinforcement conveniently sets up the reinforcement of required quantity in the first direction, guarantees that the second lateral wall has sufficient structural rigidity.

In some embodiments, each stiffener is raised above the body by a height h0 of: h0 is more than or equal to 0.5mm and less than or equal to 3mm. So, the height dimension of rational design reinforcement avoids the protrusion too high and occupies the inside space of battery to avoid influencing the energy density of battery.

In a second aspect, the present application provides a battery cell comprising: a battery case as in any one of the above; an electrode assembly housed in the chamber; and the end cover is arranged at the opening of the battery shell.

In a third aspect, the present application provides a battery module, including: a first case; a plurality of battery monomers are accommodated in the first box body; wherein, a deformation clearance is reserved on one side of the first side wall of each battery monomer.

In some embodiments, the size of the deformation gap is marked as G, and when the deformation gap is positioned between two adjacent first side walls, G is more than or equal to 0.8mm and less than or equal to 4mm; when the deformation gap is positioned between the first side wall and the inner wall of the first box body, G is more than or equal to 0.4mm and less than or equal to 2mm. So, according to the free state of arranging of battery, rationally set up the deformation clearance, under the prerequisite that guarantees that the battery case has sufficient one-way deformation space for space utilization in the first box is higher, is favorable to promoting the energy density of battery.

In some embodiments, the second sidewall of each cell is attached to the second sidewall of its adjacent cell or the inner wall of the first case. So, with two second lateral walls laminating or second lateral wall and the laminating of first box inner wall, the energy density of battery is promoted in the space of energy-conserving battery monomer one side.

In some embodiments, two adjacent second sidewalls of the plurality of battery cells are attached to each other, and the two adjacent first sidewalls are arranged at intervals to form a battery pack; when at least one side of the battery pack along the arrangement direction of the battery monomers is a first side wall, a deformation gap is reserved between the first side wall and the inner wall of the first box body; when at least one side of the battery pack along the arrangement direction of the battery monomers is a second side wall, the second side wall is attached to the inner wall of the first box body. Therefore, according to the different arrangement modes of the battery pack, the arrangement of the battery pack in the first box body is reasonably controlled, effective one-way deformation is realized, the deformation and extrusion risks are avoided, and the safety performance of the battery is improved.

In some embodiments, in the plurality of battery cells, the battery cells are arranged in a manner that side surfaces between the first side wall and the second side wall are sequentially attached to form at least two battery cells, all the battery cells are arranged along the height direction of the first box body, and each battery cell is arranged towards the bottom of the first box body by the first side wall or the second side wall; in two corresponding battery monomers of two adjacent battery packs, two first side walls face each other, and a deformation gap is reserved between the two first side walls; or the two second side walls are attached to each other. So, according to the arrangement of group battery different, the reasonable control group battery realizes effectual one-way deformation in arranging in first box, avoids out of shape the extrusion risk, promotes the security performance of battery.

In a fourth aspect, the present application provides a battery comprising: a second case; a plurality of battery monomers are accommodated in the second box body; wherein, a deformation clearance is left on one side of the first side wall of each battery monomer.

In a fifth aspect, the present application provides a battery comprising: a second case; the battery module according to any one of the above aspects is accommodated in the second case.

In a sixth aspect, the present application provides an electric device, comprising the battery as above, the battery being used for providing electric energy.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a first schematic diagram of a battery case according to some embodiments of the present disclosure;

fig. 5 is a sectional view of the battery case structure of fig. 4;

fig. 6 is a schematic diagram of a battery case structure provided in some embodiments of the present application;

FIG. 7 is a third schematic view of a battery case according to some embodiments of the present application;

fig. 8 is a sectional view of the battery case structure of fig. 7;

fig. 9 is a schematic view illustrating an internal structure of a battery module according to some embodiments of the present disclosure;

fig. 10 is a schematic view illustrating an internal structure of a battery module according to some embodiments of the present disclosure;

fig. 11 is a schematic view illustrating an internal structure of a battery module according to some embodiments of the present disclosure;

fig. 12 is a schematic structural view of a battery pack in a flat lying state according to some embodiments of the present disclosure.

1000. A vehicle; 100. a battery; 110. a second case; 111. a first portion; 112. a second portion; 200. a controller; 300. a motor; 400. a battery module; 410. a first case; 10. a battery cell; 1. a battery case; 11. a third side wall; 12. a chamber; 12a, an opening; 13. a first side wall; 14. a second side wall; 141. a body; 142. a reinforcement; 15. a deformation gap; 2. an end cap; 3. an adaptor; 4. an electrode assembly; 20. a battery pack; 30. a spacer; x, thickness direction; y, a first direction; z, a second direction; p, the arrangement direction.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, 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 application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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 appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The applicant has noted that during the charge and discharge cycles of the cell, the cell may swell. If the battery case does not have a certain deformation capability, the expansion force is likely to be too large, so that the electrolyte is unevenly distributed, thereby causing performance degradation and safety problems.

For this reason, for most of the existing battery cells, the two large sides of the battery case are generally designed in a symmetrical structure, that is, the two large sides use cases of the same material and thickness, and after long-term cycling, the two large sides of the battery cell will undergo swelling deformation. Consequently, when battery monomer arranges in battery or battery module, need all reserve sufficient space in battery monomer both sides, avoid battery monomer to lead to extrudeing each other because of structural deformation, guarantee that the expansive force in the battery monomer obtains effectively releasing.

However, in the manner of reserving space on both sides of the battery cell, it is difficult to effectively control the size of the reserved space, or the reserved space is too large, which results in low space utilization rate in the battery or the battery module and affects the energy density of the battery; or the reserved space is too small, so that the single battery body is in a risk of extrusion deformation, and the expansion force cannot be released, thereby bringing performance reduction and safety problems.

Based on this, in order to solve the problem that the battery cell is susceptible to the extrusion deformation due to the double-side expansion deformation, the present applicant has conducted intensive research and design a battery case in which a first side wall and a second side wall are disposed at opposite sides of a chamber in a thickness direction of an electrode assembly in a spaced manner. The second side wall has a greater resistance to deformation than the first side wall.

The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, an electric device for a vehicle, a ship, an aircraft, or the like. A power supply system including the electric device composed of the battery cell, the battery, and the like disclosed in the present application may be used.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as an example of a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for power requirements for operation during starting, navigation, and traveling of the vehicle 1000.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a second case 110 and the battery cell 10, and the battery cell 10 is accommodated in the second case 110. The second case 110 is used to provide a receiving space for the battery cell 10, and the second case 110 may have various structures. In some embodiments, the second case 110 may include a first portion 111 and a second portion 112, the first portion 111 and the second portion 112 cover each other, and the first portion 111 and the second portion 112 together define a receiving space for receiving the battery cell 10. The second part 112 may be a hollow structure with an opening 12a at one end, the first part 111 may be a plate-shaped structure, and the first part 111 covers the opening 12a side of the second part 112, so that the first part 111 and the second part 112 define a containing space together; the first portion 111 and the second portion 112 may be hollow structures each having one side opening 12a, and the opening 12a of the first portion 111 may be side-covered with the opening 12a of the second portion 112. Of course, the box formed by the first portion 111 and the second portion 112 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, there may be a plurality of battery cells 10, and the plurality of battery cells 10 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to that the plurality of battery cells 10 are connected in series or in parallel. The plurality of single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of single batteries 10 is accommodated in the box body; of course, the battery 100 may also be formed by connecting a plurality of battery cells 10 in series, in parallel, or in series-parallel to form a battery module 400, and then connecting a plurality of battery modules 400 in series, in parallel, or in series-parallel to form a whole, and accommodating them in the second case 110. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 10.

Wherein each battery cell 10 may be a secondary battery 100 or a primary battery 100; but is not limited to, the lithium-sulfur battery 100, the sodium-ion battery 100, or the magnesium-ion battery 100. The battery cell 10 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 10 according to some embodiments of the present disclosure. The battery cell 10 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 10 includes an end cap 2, a battery case 1, an electrode assembly 4, and other functional components.

The end cap 2 refers to a member that covers the opening 12a of the battery case 1 to insulate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 2 may be adapted to the shape of the battery case 1 to fit the battery case 1. Alternatively, the end cap 2 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 2 is not easily deformed when being extruded and collided, and the single battery 10 may have a higher structural strength and improved safety performance. The end cap 2 may be provided with functional components such as electrode terminals. The electrode terminals may be used to electrically connect with the electrode assembly 4 for outputting or inputting electric power of the battery cell 10. In some embodiments, the end cap 2 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cap 2 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this application. In some embodiments, an insulating member may be further provided inside the end cap 2, and the insulating member may be used to isolate the electrical connection member inside the battery case 1 from the end cap 2, so as to reduce the risk of short circuit. Illustratively, the insulator may be plastic, rubber, or the like.

The battery case 1 is an assembly for engaging the end cap 2 to form an internal environment of the battery cell 10, wherein the formed internal environment may be used to house the electrode assembly 4, an electrolyte, and other components. The battery case 1 and the end cap 2 may be separate components, and an opening 12a may be formed in the battery case 1, and the opening 12a may be covered by the end cap 2 at the opening 12a to form an internal environment of the battery cell 10. The end cap 2 and the battery case 1 may be integrated, and specifically, the end cap 2 and the battery case 1 may form a common connecting surface before other components are inserted into the battery case, and when it is required to seal the inside of the battery case 1, the end cap 2 covers the battery case 1. The battery case 1 may have various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the battery case 1 may be determined according to the specific shape and size of the electrode assembly 4. The material of the battery case 1 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

The electrode assembly 4 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 4 may be contained in the battery case 1. The electrode assembly 4 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portion of the electrode assembly 4, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

According to some embodiments of the present application, please refer to fig. 4, the present application provides a battery case 1 for a battery cell 10. The battery case 1 has a cavity 12 therein for receiving the electrode assembly 4, and the battery case 1 includes a first sidewall 13 and a second sidewall 14. The first side wall 13 and the second side wall 14 are provided at opposite sides of the chamber 12 in the thickness direction X of the electrode assembly 4 with a space therebetween. Wherein the deformation resistance of the second side wall 14 is greater than the deformation resistance of the first side wall 13.

The thickness direction X of the electrode assembly 4 is understood to be: the direction from one large surface to the other large surface on the electrode assembly 4, and the like. Here, the "large surface" refers to a side surface of the electrode assembly 4 having a large area, and it is understood that the electrode assembly 4 has a large surface area when wound or laminated.

The deformation resistance refers to the basic property of the material to describe its elastically deformed form under the action of an external force. The greater resistance of the second side wall 14 to deformation than the first side wall 13 indicates that the first side wall 13 is more susceptible to bulging deformation relative to the second side wall 14.

In addition, the deformation resistance of the second side wall 14 is greater than that of the first side wall 13, and various ways are available, such as: increasing the thickness of the second sidewall 14; alternatively, the modulus of elasticity of the material of the second sidewall 14 is enhanced; further alternatively, a reinforcing structure or the like is provided on the second side wall 14; still alternatively, the second sidewall 14 may be subjected to a heat treatment process, such as quenching (solution heat treatment), aging, or the like. Of course, the above implementation manners may be combined in pairs or in various combinations.

Because the deformation resistance of the first side wall 13 is weaker than that of the second side wall 14, the expansion of the battery case 1 is easily concentrated on the first side wall 13, and the expansion deformation degree on the second side wall 14 is weakened or eliminated, so that the battery case 1 realizes unidirectional deformation as much as possible, and the deformation and extrusion risks caused by the fact that the reserved space cannot be accurately controlled due to bidirectional expansion deformation are avoided. So, when battery cell 10 arranged, only need one-way reservation clearance, can improve battery cell 10 deformation situation, reduce the extruded risk of deformation, promote battery 100 security performance and cycling performance.

According to some embodiments of the present application, optionally, referring to fig. 5, the thickness h1 of the first sidewall 13 is smaller than the thickness h2 of the second sidewall 14.

The materials of the first side wall 13 and the second side wall 14 may be uniform or nonuniform. When the materials of the first sidewall 13 and the second sidewall 14 are not the same, the elastic modulus of the material of the second sidewall 14 should be greater than or equal to the elastic modulus of the material of the first sidewall 13; alternatively, the elastic modulus of the material of the second sidewall 14 may be slightly smaller than that of the first sidewall 13, but the difference in thickness between the thickness of the second sidewall 14 and the thickness of the first sidewall 13 should compensate for the effect of the difference in elastic modulus on the stiffness of the material, such as: the thickness of the second side wall 14 should be greater than the thickness of the first side wall 13, etc. Of course, it should be noted that the modulus of elasticity of the material of the second sidewall 14 should not be much less than the modulus of elasticity of the material of the first sidewall 13.

The relation of the deformation resistance between the second side wall 14 and the first side wall 13 is converted into the control of the thicknesses of the second side wall and the first side wall, so that the manufacturing of the battery shell 1 is simplified and the forming efficiency is improved on the premise of realizing effective unidirectional deformation.

According to some embodiments of the present application, optionally, the thickness h1 of the first sidewall 13 and the thickness h2 of the second sidewall 14 respectively satisfy the condition: h1 is more than or equal to 0.4mm and less than or equal to 0.8mm, and h2 is more than or equal to 0.8mm and less than or equal to 3mm.

The thickness of the first side wall 13 should not be too thin during design, and if the thickness is too thin, the first side wall 13 is deformed too much, so that the overall structure of the battery case 1 is easy to be unstable; the thickness of the second side wall 14 should not be too thick during design, and if the thickness is too thick, the second side wall 14 occupies too much space inside the battery case 1, and the skirt margin inside the battery cell 10 is affected.

The thickness h1 of the first sidewall 13 may be any one of 0.4mm to 0.8mm, for example: the thickness h1 of the first sidewall 13 may be, but is not limited to, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. The thickness h2 of the second sidewall 14 may be any value from 0.8mm to 3mm, for example: the thickness h2 of the second sidewall 14 may be, but is not limited to, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. In addition, when the thickness of the first sidewall 13 and the thickness of the second sidewall 14 are taken as values, it should be noted that the thicknesses of the first sidewall 13 and the second sidewall 14 cannot be taken as the same value, for example, the thicknesses of the first sidewall 13 and the second sidewall 14 cannot be taken as 0.8mm at the same time.

The thickness of the first side wall 13 and the second side wall 14 is reasonably controlled, so that effective unidirectional deformation is realized, and the influence on the skirt margin is reduced.

According to some embodiments of the present application, optionally, the thickness h1 of the first side wall 13 and the thickness h2 of the second side wall 14 respectively satisfy the condition: h1 is more than or equal to 0.5mm and less than or equal to 0.7mm, and h2 is more than or equal to 1.0mm and less than or equal to 1.4mm.

The thickness h1 of the first sidewall 13 may be any one of 0.5mm to 0.7mm, for example: the thickness h1 of the first sidewall 13 may be, but is not limited to, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, etc. The thickness h2 of the second sidewall 14 may be any value from 1mm to 1.4mm, for example: the thickness h2 of the second sidewall 14 may be, but is not limited to, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc.

For convenience of explaining the effect of the battery case 1 with the different thicknesses of the first side wall 13 and the second side wall 14 on the cycle performance of the battery 100, the thickness h1 of the first side wall 13 and the thickness h2 of the second side wall 14 are both 0.6mm, the thickness h1 of the first side wall 13 is 0.6mm, the thickness h2 of the second side wall 14 is 1.2mm, and the thickness h1 of the first side wall 13 and the thickness h2 of the second side wall 14 are both 1.2mm, respectively. Of course, the first sidewall 13 and the second sidewall 14 in the above test items are made of aluminum materials, and the specific reference can be made to table 1 after 2000 cycles.

TABLE 1

	Degree of deformation of the first side wall 13	Degree of deformation of the second side wall 14	Retention ratio of circulating capacity
				Double-sided thin shell	3.2mm	3.2mm	81％
One side is thin and the other side is thick	5.3mm	0.8mm	84％
				Thickness of both sides	1.0mm	1.0mm	76％

As can be seen from table 1, the battery case 1 having one thin side and one thick side is likely to concentrate on the first side wall 13 during the expansion deformation, and a good unidirectional deformation effect can be achieved. Meanwhile, the first side wall 13 and the second side wall 14 are designed to have different thicknesses, so that the retention rate of the cycle capacity of the battery cell 10 can be improved, and the cycle performance of the battery 100 can be improved.

The thicknesses of the first side wall 13 and the second side wall 14 are further reasonably controlled, and the unidirectional deformation effect can be better realized; and at the same time, it is also advantageous to improve the cycle performance of the battery 100.

According to some embodiments of the present application, optionally, referring to fig. 6, the elastic modulus e1 of the material of the first sidewall 13 is smaller than the elastic modulus e2 of the material of the second sidewall 14.

The elastic modulus of the material refers to the proportional relation between the stress and the strain of the material in the elastic deformation stage (namely, the material conforms to Hooke's law), namely the proportionality coefficient. The magnitude of the elastic modulus of a material is related to the type of material, such as: in conventional aluminum (e.g., 5 series or 6 series aluminum alloy), super hard aluminum alloy (e.g., aluminum-zinc-magnesium-copper alloy (e.g., 7a 04)), the elastic modulus of the two alloys are different, and other materials can be selected for the first sidewall 13 and the second sidewall 14.

The thickness of the first side wall 13 and the second side wall 14 may be uniform or nonuniform. When the thicknesses of the first side wall 13 and the second side wall 14 are not consistent, the thickness of the second side wall 14 should be greater than or equal to the thickness of the first side wall 13; alternatively, the thickness of the second sidewall 14 may be slightly less than the thickness of the first sidewall 13, but the difference in thickness between the modulus of elasticity of the material of the second sidewall 14 and the modulus of elasticity of the material of the first sidewall 13 should be able to compensate for the effect of the difference in thickness on the stiffness of the material, such as: the modulus of elasticity of the material of the second side wall 14 should be greater than the modulus of elasticity of the material of the first side wall 13, etc. It should be noted, of course, that the thickness of the second side wall 14 should not be much less than the thickness of the first side wall 13.

The relation of the deformation resistance between the second side wall 14 and the first side wall 13 is converted into the control of the elastic modulus of the materials of the second side wall and the first side wall, so that the manufacturing of the battery case 1 is facilitated on the premise of realizing effective unidirectional deformation.

According to some embodiments of the present application, optionally, the elastic modulus e1 of the material of the first sidewall 13 is smaller than the elastic modulus e2 of the material of the second sidewall 14, respectively, and the following conditions are satisfied: e1 is more than or equal to 40Gpa and less than or equal to 100Gpa, e2 is more than or equal to 160Gpa and less than or equal to 240Gpa.

The elastic modulus of the material of the first side wall 13 should not be too small during design, and if it is too small, the deformation of the first side wall 13 is too large, which may easily cause instability of the overall structure of the battery case 1.

The elastic modulus e1 of the material of the first sidewall 13 may be any value from 40Gpa to 100Gpa, for example: the elastic modulus e1 of the material of the first sidewall 13 may be, but is not limited to, 40Gpa, 50Gpa, 60Gpa, 70Gpa, 80Gpa, 90Gpa, 100Gpa, etc. The elastic modulus e2 of the material of the second sidewall 14 may be any value from 160Gpa to 240Gpa, for example: the modulus of elasticity e2 of the material of the second sidewall 14 can be, but is not limited to, 160Gpa, 180Gpa, 200Gpa, 220Gpa, 240Gpa, etc.

For convenience of explaining the effect of the battery case 1 with different elastic moduli of the first side wall 13 and the second side wall 14 on the cycle performance of the battery 100, the materials of the first side wall 13 and the second side wall 14 are both conventional aluminum, the material of the first side wall 13 is conventional aluminum, the material of the second side wall 14 is superhard aluminum alloy, and the materials of the first side wall 13 and the second side wall 14 are both superhard aluminum alloy, respectively. Of course, the first side wall 13 and the second side wall 14 in the above test items can be controlled to be 0.5mm to 0.7mm, and the table 2 can be referred to specifically after 2000 cycles.

TABLE 2

As can be seen from table 2, the battery can 1 made of both conventional aluminum and superhard aluminum is easy to concentrate on the first sidewall 13 during the expansion deformation, and can achieve a good unidirectional deformation effect. Meanwhile, the first side wall 13 and the second side wall 14 are designed to be made of different materials, so that the retention rate of the cycle capacity of the battery cell 10 can be improved, and the cycle performance of the battery 100 can be improved.

The elastic modulus of the materials of the first side wall 13 and the second side wall 14 is reasonably controlled, so that effective one-way deformation can be realized, and the safety performance and the cycle performance of the battery 100 are improved.

According to some embodiments of the present application, optionally, referring to fig. 7, the second sidewall 14 includes a body 141 and a reinforcement 142, the body 141 and the first sidewall 13 are spaced apart from each other at two opposite sides of the cavity 12 along the thickness direction X of the electrode assembly 4, and the reinforcement 142 is disposed on the body 141.

The reinforcing member 142 is a member provided on the body 141 to increase the structural rigidity of the body 141, and the material of the reinforcing member 142 may be the same as or different from the material of the body 141. The cross-sectional shape of the stiffener 142 may be, but is not limited to, semi-circular, semi-elliptical, trapezoidal, square, or rectangular, etc.

The reinforcement 142 may be fixed to the body 141 in a combined manner, or may be fixed to the body 141 in an integrally formed manner. Wherein, the combination mode can be but not limited to bolt connection, clamping, riveting, welding and the like; the integrated forming mode can be die casting, extrusion and other processes.

In addition, the reinforcing member 142 may be disposed on one side of the body 141 facing the cavity 12, i.e., the inner surface of the battery case 1; or on the side of the body 141 facing away from the cavity 12, i.e., the outer surface of the battery case 1. When the reinforcing member 142 is disposed on a side of the body 141 facing away from the cavity 12, the reinforcing member 142 does not affect the internal space of the battery case 1, and the internal group margin of the battery cell 10 is ensured to be unchanged.

For convenience of explaining the effect of the battery case 1 having the first sidewall 13 and the second sidewall 14 without the reinforcing member 142 on the cycle performance of the battery 100, the materials of the first sidewall 13 and the second sidewall 14 have no reinforcing member 142, the material of the first sidewall 13 has no reinforcing member 142, and the material of the second sidewall 14 has the reinforcing member 142, and the materials of the first sidewall 13 and the second sidewall 14 have the reinforcing member 142, respectively. Of course, the first sidewall 13 and the second sidewall 14 in the above experimental items can be controlled to be 0.5mm to 0.7mm, and the materials are all conventional aluminum, wherein, when the second sidewall 14 has the reinforcement 142, the thickness of the body 141 is controlled to be 0.5mm to 0.7mm, and after 2000 cycles, the specific reference can be made to table 3.

TABLE 3

As can be seen from table 3, the battery case 1 having the reinforcement 142 without the reinforcement 142 can achieve a good unidirectional deformation effect because the reinforcement 142 is easily concentrated on the first side wall 13 during the expansion deformation. Meanwhile, the reinforcing member 142 is disposed on the body 141, so that the retention rate of the circulation capacity of the battery cell 10 is improved, and the circulation performance of the battery 100 is improved.

The reinforcing member 142 is disposed on the body 141, so as to improve the structural rigidity of the second sidewall 14, achieve effective unidirectional deformation, and improve the safety performance and the cycle performance of the battery 100.

According to some embodiments of the present application, optionally, referring to fig. 7, on a side of the body 141 facing away from the chamber 12, there are at least two reinforcements 142, and all the reinforcements 142 are arranged at intervals along the first direction Y; wherein the first direction Y intersects the thickness direction X of the electrode assembly 4, and an end of the chamber 12 in the first direction Y has an opening 12a.

The end of the chamber 12 in the first direction Y has an opening 12a, and the opening 12a allows the electrode assembly 4 to be housed in the battery can 1. At this time, the first direction Y may be understood as a height direction of the battery case 1.

The plurality of reinforcing members 142 are arranged at intervals along the first direction Y, which is beneficial to further improving the structural rigidity of the second side wall 14, and reducing or eliminating the expansion deformation of one side of the second side wall 14, so that the arrangement of the single cells 10 is more convenient; meanwhile, it is also advantageous to improve the safety and cycle performance of the battery 100.

According to some embodiments of the present application, optionally, referring to fig. 7, a ratio η between a distance D between two adjacent reinforcing members 142 and a height H of the battery case 1 in the first direction Y satisfies a condition that: eta is more than or equal to 0.1 and less than or equal to 0.3.

The ratio η may be any value from 0.1 to 0.3, such as: the ratio η may be, but is not limited to, 0.1, 0.15, 0.2, 0.25, 0.3, etc.

When the ratio eta is too small, the number of the reinforcing parts 142 is small, and the effect of unidirectional deformation is poor; when the ratio η is too small, the overall weight of the battery case 1 is increased, and the material manufacturing cost is high.

Rationally distributed reinforcement 142 structural design, under guaranteeing reasonable cost of manufacture, promote battery case 1's one-way deformation effect.

According to some embodiments of the present application, optionally, referring to fig. 7, the reinforcing member 142 extends in the second direction Z at the body 141, an extending length L1 of the reinforcing member 142 is smaller than a length L2 of the body 141 in the second direction Z, and a difference Δ L between the two is: deltaL is more than or equal to 2mm and less than or equal to 8mm, wherein the second direction Z is respectively vertical to the first direction Y and the thickness direction X of the electrode assembly 4.

The difference Δ L between the length of the stiffener and the length of the body 141 may be, but is not limited to, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc.

The extension length of the reinforcing member 142 in the second direction Z is reasonably controlled on the body 141, so that the reinforcing member 142 is not too long, and the overall structure is not heavy; but also ensures that the second side wall 14 has sufficient rigidity to effect unidirectional deformation.

According to some embodiments of the present application, optionally, referring to fig. 7, a width W of each stiffener 142 in the first direction Y is: w is more than or equal to 1mm and less than or equal to 5mm.

The width W of the stiffener 142 may be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, etc.

The width of the reinforcing members 142 is appropriately designed to facilitate the arrangement of a desired number of reinforcing members 142 in the first direction Y, so as to ensure sufficient structural rigidity of the second side wall 14.

According to some embodiments of the present application, optionally, referring to fig. 8, a height h0 of each stiffener 142 protruding from the body 141 is: h0 is more than or equal to 0.5mm and less than or equal to 3mm.

The height h0 of the stiffener 142 may be, but is not limited to, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, and the like.

The height of the reinforcing member 142 is designed to avoid the protrusion from being too high to occupy the space inside the battery 100, thereby avoiding affecting the energy density of the battery 100.

According to some embodiments of the present application, referring to fig. 3, a battery cell 10 is provided. The battery cell 10 includes: electrode assembly 4, end cap 2 and battery case 1 as in any of the above aspects. The electrode assembly 4 is housed in the chamber 12. The end cap 2 covers the opening 12a of the battery case 1.

Referring to fig. 9, according to some embodiments of the present application, a battery module 400 is provided. The method comprises the following steps: the first box 410 and a plurality of the battery cells 10 in the above schemes. The battery cell 10 is housed in the first case 410. Wherein, a deformation gap 15 is left on one side of the first side wall 13 of each battery cell 10.

The arrangement of the battery cells 10 in the first case 410 may be variously set, for example: the two battery cells 10 are arranged in a manner that the second side wall 14 is attached to the second side wall 14 or a gap is slightly left between the two side walls; or, the two battery cells 10 are arranged in a manner that a deformation gap 15 is left between the first side wall 13 and the first side wall 13; or, the second side wall 14 of the battery cell 10 is attached to the inner wall of the first case 410 or arranged with a gap; still alternatively, the first side walls 13 of the battery cells 10 and the inner wall of the first case 410 are arranged with a deformation gap 15 left.

The deformation gap 15 is a space provided on the side of the first side wall 13 of the battery cell 10 for the battery case 1 to expand and deform in one direction, and the size of the gap is determined according to the expansion degree of the battery cell 10 and the actual size of the battery cell 10. The deformation gap 15 can be implemented by providing a spacer 30 between the two first side walls 13; the battery cell 10 may be fixed by bonding with glue to form a gap or the like without providing the spacer 30.

Above-mentioned battery module 400, when battery monomer 10 arranged, only need one-way reservation deformation clearance 15, can improve battery monomer 10 deformation situation, reduce the extruded risk of deformation, promote battery 100 security performance and cyclicity ability.

According to some embodiments of the present application, optionally, the size of the deformation gap 15 is denoted as G, and when the deformation gap 15 is located between two adjacent first sidewalls 13, G is greater than or equal to 0.8mm and less than or equal to 4mm, please refer to fig. 10; when the deformation gap 15 is located between the first sidewall 13 and the inner wall of the first case 410, G is greater than or equal to 0.4mm and less than or equal to 2mm, please refer to FIG. 11.

The deformation gap 15 has two conditions: 1. the deformation gap 15 is located between two adjacent first side walls 13, that is, two battery cells 10 are arranged opposite to each other with the surface with weaker rigidity; 2. the deformation gap 15 is located between the first side wall 13 and the inner wall of the first case 410, i.e., the battery cells 10 are arranged facing the inner wall of the first case 410 with a weaker rigidity.

When the deformation gap 15 is located between two adjacent first sidewalls 13, the deformation gap 15G may be, but is not limited to, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. When the deformation gap 15 is located between the first sidewall 13 and the inner wall of the first case 410, the deformation gap 15G may be, but is not limited to, 0.4mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.

According to the state of arranging of battery monomer 10, rationally set up deformation clearance 15, under the prerequisite that guarantees that battery case 1 has sufficient unidirectional deformation space for space utilization in the first box 410 is higher, is favorable to promoting battery 100's energy density.

According to some embodiments of the present application, referring to fig. 10 and 11, optionally, the second sidewall 14 of each battery cell 10 is attached to the second sidewall 14 of its adjacent battery cell 10 or the inner wall of the first case 410.

The single batteries 10 are arranged in the first box body 410, and the second side wall 14 of the single battery 10 can be attached to the second side wall 14 of another single battery 10; and may be attached to the inner wall of the first casing 410. Since the second side wall 14 has a rigidity higher than that of the first side wall 13, the second side wall 14 is hardly deformed, and thus, the space on the side of the battery cell 10 is saved by attaching the two second side walls 14 or attaching the second side wall 14 to the inner wall of the first case 410.

The two second side walls 14 are attached to each other or the second side wall 14 is attached to the inner wall of the first box 410, so that the space on one side of the battery cell 10 is saved, and the energy density of the battery 100 is improved.

According to some embodiments of the present application, optionally, referring to fig. 9, a plurality of battery cells 10 are attached to two adjacent second sidewalls 14, and two adjacent first sidewalls 13 are arranged at intervals to form a battery pack 20; when at least one side of the battery pack 20 along the arrangement direction P of the battery cells 10 is a first side wall 13, a deformation gap 15 is left between the first side wall 13 and the inner wall of the first box 410; when at least one side of the battery pack 20 along the arrangement direction P of the battery cells 10 is the second sidewall 14, the second sidewall 14 is attached to the inner wall of the first case 410.

The arrangement of the single cells 10 in the first case 410 may be formed into a battery pack 20; and is arranged in the first case 410 in the form of a battery pack 20. In the battery pack 20, the opposite sides in the arrangement direction P are different in the arrangement order, and the kinds of the side walls thereof are different, for example: the structure comprises a first side wall 13, a second side wall 14 (attached), the first side wall 13 (deformation gap 15), \8230;, and the first side wall 13, wherein both sides are the first side wall 13; or the first side wall 13, the second side wall 14 (attached), the first side wall 13 (deformation gap 15), \8230;, the first side wall 13 (deformation gap 15), and the second side wall 14, wherein the first side wall 13 and the second side wall 14 are respectively arranged at the two sides; or, the second side wall 14, the first side wall 13 (deformation gap 15), the second side wall 14 (fitting), \8230, the second side wall 14, both sides of the second side wall 14 at this time; or, the second sidewall 14, the first sidewall 13 (deformation gap 15), the second sidewall 14 (fitting), \ 8230 \ 8230;, the second sidewall 14, the second sidewall 14 (fitting), and the first sidewall 13, where the two sides are the first sidewall 13 and the second sidewall 14, respectively.

Since the two sides of the battery pack 20 have different types of sidewalls according to different arrangement, when at least one of the two sides is the first sidewall 13, at least one side of the battery pack 20 needs to leave a deformation gap 15 with the inner wall of the first case 410; when at least one of the two sides is the second sidewall 14, at least one side of the battery pack 20 needs to be attached to the inner wall of the first case 410.

According to the different arrangement of group battery 20, rationally control the arranging of group battery 20 in first box 410, realize effectual one-way deformation, avoid the extrusion risk that warp, promote battery 100's security performance.

According to some embodiments of the present application, optionally, referring to fig. 12, in the plurality of single battery cells 10, the single battery cells 10 are arranged in a manner that the side surfaces between the first side wall 13 and the second side wall 14 are sequentially attached to form the battery pack 20, at least two battery packs 20 are provided, all the battery packs 20 are arranged along the height direction of the first case 410, and each battery pack 20 is placed with the first side wall 13 or the second side wall 14 facing the bottom of the first case 410; in two corresponding battery monomers 10 of two adjacent battery packs 20, two first side walls 13 face each other, and a deformation gap 15 is left between the two first side walls; alternatively, the two second sidewalls 14 are attached to each other.

In the battery pack 20, the battery cells 10 may be arranged in a manner of being attached to the second side walls 14 and being spaced apart from the first side walls 13, or may be arranged in a manner of being attached to other sides of the battery cells 10. Such as: two third sidewalls 16 are arranged between the first sidewall 13 and the second sidewall 14 at intervals, and the third sidewalls 16 are arranged between the single batteries 10 in a mutually attached manner. At this time, the battery pack 20 is also formed in various types, such as: the first side walls 13 of the battery single bodies 10 are located on the same side, and the second side walls 14 of the battery single bodies 10 are located on the other side; alternatively, on the same side, the first side walls 13 alternate with the second side walls 14, and so on.

The arrangement of each battery pack 20 with the first side wall 13 or the second side wall 14 facing the bottom of the first case 410 is understood as follows: the battery pack 20 is disposed in a flat state in the first casing 410.

It should be noted that, although there are various orientations of the first sidewall 13 and the second sidewall 14 in the battery packs 20, in two adjacent battery packs 20, the arrangement of the first sidewall 13 and the second sidewall 14 should satisfy a certain rule, that is, in the upper and lower battery packs 20, when the first sidewall 13 of the lower layer faces upward, the first sidewall 13 of the upper layer should face downward; alternatively, when the second sidewall 14 of the lower layer faces upward, the second sidewall 14 of the upper layer should face downward.

According to some embodiments of the present application, please refer to fig. 2, which provides a battery 100, the battery 100 includes: a second case 110 and a plurality of battery cells 10 as in the above scheme. The battery cells 10 are accommodated in the second case 110. Wherein, a deformation gap 15 is left on one side of the first side wall 13 of each battery cell 10.

In the battery 100, there is no module concept, that is, the inside of the battery 100 is directly formed by arranging a plurality of battery cells 10.

According to some embodiments of the present application, there is provided a battery 100, the battery 100 comprising: a second case 110 and a battery module 400 as in any of the above aspects. The battery module 400 is accommodated in the second case 110.

According to some embodiments of the present application, the present application provides an electric device, which includes the battery 100 as in the above solution, and the battery 100 is used for providing electric energy.

Referring to fig. 4-12, an asymmetric battery 100 housing structure is provided according to some embodiments of the present disclosure. One side of the shell is a thin aluminum shell or a thin shell made of other materials; the other side is made of a material or a structure with higher rigidity, such as a thick shell structure made of the same material as the thin shell, an alloy material with higher rigidity, a shell structure provided with a reinforcing rib structure, or a combination of the three.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery case (1) for a battery cell (10), wherein the battery case (1) has a cavity (12) therein for accommodating an electrode assembly (4), the battery case (1) comprises a first side wall (13) and a second side wall (14), and the first side wall (13) and the second side wall (14) are spaced and enclosed at two opposite sides of the cavity (12) along a thickness direction (X) of the electrode assembly (4);

wherein the deformation resistance of the second side wall (14) is greater than the deformation resistance of the first side wall (13).

2. The battery case (1) according to claim 1, wherein a thickness h1 of the first side wall (13) is less than a thickness h2 of the second side wall (14).

3. The battery case (1) according to claim 2, wherein the thickness h1 of the first side wall (13) and the thickness h2 of the second side wall (14) respectively satisfy the condition that: h1 is more than or equal to 0.4mm and less than or equal to 0.8mm, and h2 is more than or equal to 0.8mm and less than or equal to 3mm.

4. The battery case (1) according to claim 3, wherein the thickness h1 of the first side wall (13) and the thickness h2 of the second side wall (14) respectively satisfy the condition of: h1 is more than or equal to 0.5mm and less than or equal to 0.7mm, and h2 is more than or equal to 1.0mm and less than or equal to 1.4mm.

5. The battery case (1) according to claim 1, wherein the modulus of elasticity e1 of the material of the first side wall (13) is smaller than the modulus of elasticity e2 of the material of the second side wall (14).

6. The battery case (1) according to claim 2, wherein the condition that the material elastic modulus e1 of the first side wall (13) is smaller than the material elastic modulus e2 of the second side wall (14) is satisfied: e1 is more than or equal to 40Gpa and less than or equal to 100Gpa, e2 is more than or equal to 160Gpa and less than or equal to 240Gpa.

7. The battery case (1) according to claim 1, wherein the second side wall (14) comprises a body (141) and a reinforcement member (142), the body (141) and the first side wall (13) are located at opposite sides of the cavity (12) in a thickness direction (X) of the electrode assembly (4), and the reinforcement member (142) is provided on the body (141).

8. The battery casing (1) according to claim 7, wherein on a side of said body (141) facing away from said chamber (12), said reinforcing members (142) are at least two, and all of said reinforcing members (142) are arranged at intervals along a first direction (Y);

wherein the first direction (Y) intersects a thickness direction (X) of the electrode assembly (4), and an end of the chamber (12) in the first direction (Y) has an opening (12 a).

9. The battery case (1) according to claim 8, wherein a ratio η between a spacing D between adjacent two of the reinforcing members (142) and a height H of the battery case (1) in the first direction (Y) satisfies a condition that: eta is more than or equal to 0.1 and less than or equal to 0.3.

10. The battery case (1) according to claim 8, wherein the reinforcing member (142) extends in the second direction (Z) at the body (141), the reinforcing member (142) has an extension length L1 smaller than a length L2 of the body (141) in the second direction (Z), and a difference Δ L therebetween is: Δ L is greater than or equal to 2mm and less than or equal to 8mm, wherein the second direction (Z) is perpendicular to the first direction (Y) and the thickness direction (X) of the electrode assembly (4), respectively; and/or the presence of a gas in the gas,

a width W of each of the stiffeners (142) in the first direction (Y) is: w is more than or equal to 1mm and less than or equal to 5mm; and/or the presence of a gas in the gas,

the height h0 of each reinforcing piece (142) protruding on the body (141) is as follows: h0 is more than or equal to 0.5mm and less than or equal to 3mm.

11. A battery cell (10), comprising:

the battery case (1) according to any one of claims 1 to 10;

an electrode assembly (4) housed within the chamber (12);

and an end cap (2) that covers the opening (12 a) of the battery case (1).

12. A battery module (400), comprising:

a first case (410);

a plurality of battery cells (10) as defined in claim 11 housed in said first housing (410);

wherein, a deformation gap (15) is reserved on one side of the first side wall (13) on each battery monomer (10).

13. The battery module (400) according to claim 12, wherein the deformation gap (15) is G, and when the deformation gap (15) is located between two adjacent first side walls (13), G is greater than or equal to 0.8mm and less than or equal to 4mm;

when the deformation gap (15) is positioned between the first side wall (13) and the inner wall of the first box body (410), G is larger than or equal to 0.4mm and smaller than or equal to 2mm.

14. The battery module (400) of claim 12, wherein the second sidewall (14) of each cell (10) abuts the second sidewall (14) of its adjacent cell (10) or an inner wall of the first case (410).

15. The battery module (400) according to any one of claims 12-14, wherein a plurality of the battery cells (10) are attached to two adjacent second side walls (14) and arranged in a manner that two adjacent first side walls (13) are spaced to form a battery pack (20);

when at least one side of the battery pack (20) along the arrangement direction (P) of the battery cells (10) is the first side wall (13), the deformation gap (15) is reserved between the first side wall (13) and the inner wall of the first box body (410);

when at least one side of the battery pack (20) along the arrangement direction (P) of the battery cells (10) is the second side wall (14), the second side wall (14) is attached to the inner wall of the first box body (410).

16. The battery module (400) according to any one of claims 12-14, wherein, in a plurality of battery cells (10), each battery cell (10) is arranged in a manner that the side surfaces between the first side wall (13) and the second side wall (14) are sequentially attached to form a battery pack (20), at least two battery packs (20) are arranged, all the battery packs (20) are arranged along the height direction of the first box body (410), and each battery pack (20) is arranged with the first side wall (13) or the second side wall (14) facing the bottom of the first box body (410);

in two corresponding battery units (10) of two adjacent battery packs (20), two first side walls (13) face each other, and a deformation gap (15) is reserved between the two first side walls; or, the two second side walls (14) are attached to each other.

17. A battery (100), comprising:

a second case (110);

a plurality of battery cells (10) according to claim 11 housed in said second housing (110);

18. A battery (100) characterized by comprising:

a second case (110);

the battery module (400) according to any one of claims 12 to 16, housed in the second case (110).

19. An electric consumer, characterized in that it comprises a battery (100) according to claim 17 or 18, said battery (100) being intended to provide electric energy.