CN217589163U - Battery shell, battery monomer, battery and power consumption device - Google Patents

Abstract

The utility model discloses a battery case, battery monomer, battery and power consumption device, this battery case is equipped with at least one attenuate region, attenuate region and open end interval setting on the internal face of shell body including the shell body that has the open end. Specifically, set up at least one attenuate region in the inside of casing body to this attenuate region is located the internal face of casing body, through set up at least one attenuate region on the internal face at casing body, makes the inside space of casing body obtain the increase, when electric core subassembly is installed inside the casing body, can improve the proportion of electric core subassembly inside battery case, makes the energy density who makes electric core subassembly obtain improving.

Description

Battery shell, battery monomer, battery and power consumption device

Technical Field

The utility model relates to an electric automobile technical field especially relates to a battery case, battery monomer, battery and power consumption device.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

With the development of new energy, new energy is adopted as power in more and more fields. Because of the advantages of high energy density, cyclic charging, safety, environmental protection and the like, the battery is widely applied to the fields of new energy automobiles, consumer electronics, energy storage systems and the like.

The battery has battery case and locates the electric core subassembly in the battery case, and battery case forms the protection to the electric core subassembly to guarantee the safe in utilization of battery. The space of the battery case for accommodating the cell assembly directly determines the energy density of the cell assembly, and therefore, how to increase the internal space of the battery case becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a battery case, battery monomer, battery and power consumption device can increase the problem of battery case's inner space.

The utility model discloses a first aspect provides a battery case, battery case is including the shell body that has the open end, it is regional to be equipped with at least one attenuate on the internal face of shell body, the attenuate regional with the open end interval sets up.

According to the utility model discloses a battery case sets up at least one attenuate region in the inside of casing body to this attenuate region is located the internal face of casing body, through set up at least one attenuate region on the internal face of casing body, makes the inside space of casing body obtain the increase, when the electric core subassembly is installed inside the casing body, can improve the electric core subassembly and compare in battery case inside, makes the energy density of electric core subassembly obtain improving.

In some embodiments of the present invention, the inner wall surface includes an inner side wall, and the at least one thinning region is provided on the inner side wall. Through setting up the attenuate region on the inside wall of shell body to can make the inner space of shell body obtain increasing on width and/or length direction, improve electric core subassembly when installing in the battery case the space ratio of electric core subassembly, make the energy density of electric core subassembly obtain improving.

In some embodiments of the present invention, the inner wall includes a first side wall and a second side wall, the area of the first side wall is larger than the area of the second side wall, and the first side wall is provided with the thinning region. By providing the thinned region on the first side wall having a large area, the ratio of the increase of the internal space of the battery case on one side of the first side wall is greater than that on the other inner side walls, and the internal space of the battery case is further increased.

In some embodiments of the present invention, the thickness of the first sidewall is T1, and the thickness of the thinning region is T2, wherein T2= T1- Δ, and Δ ≧ 0.03mm. Through setting for the thickness in attenuate region, guaranteed on the inner space's of increase battery case basis for battery case's intensity has obtained the assurance.

In some embodiments of the present invention, the inner sidewall further includes a third sidewall, the third sidewall is opposite to the first sidewall, the thickness of the third sidewall is T3, wherein T3 > T2. The first side wall and the third side wall are oppositely arranged, the thickness of the third side wall is larger than that of the thinning area, and the structure of the third side wall can ensure that the overall strength of the battery shell is enhanced on the basis of increasing the internal space of the battery shell.

In some embodiments of the present invention, the inner wall surface further includes an inner bottom surface, and the thinning region intersects with the inner bottom surface. Through crossing the attenuate region with interior bottom surface for the attenuate area of the inside wall of shell body has obtained further increase, has further increased battery case's space.

In some embodiments of the present invention, the inner wall surface further includes an inner bottom surface, and the thinning region is spaced from the inner bottom surface. Through setting up the interior bottom surface interval with the attenuate region with the shell body to increased inside wall and interior bottom surface hookup location's intensity, made battery case's bulk strength obtain the assurance.

In some embodiments of the present invention, the thinning region and the non-thinning region are provided between the opening ends, the thinning region and the connecting position of the non-thinning region are provided with a transition region. The transition region is arranged to prevent stress concentration between the thinning region and the non-thinning region, so that the overall strength of the battery shell is ensured.

In some embodiments of the present invention, the transition region is a slope structure or a concave arc structure. Set up transition region into inclined plane structure or concave cambered surface structure to prevent the production of sharp-pointed structure, and then avoid electric core subassembly installation in to the interference or the fish tail that electric core subassembly produced.

In some embodiments of the present invention, the distance between the non-thinning region and the opening end is L, wherein L =5mm to 6mm. Through in non-attenuate region with set up distance L between the open end, prevent to carry out the attenuate to the position of open end, when guaranteeing to increase battery case's space for the intensity of open end is not influenced.

In some embodiments of the present invention, the battery case further includes a cover plate, the cover plate is welded and fixed to the case body and closes the open end. The cover plate is arranged, and the opening end of the shell body is sealed through welding of the cover plate and the shell body, so that a battery shell structure isolated from the inside and the outside is formed, and an electric core arranged inside the battery shell is effectively isolated from the outside.

A second aspect of the present invention provides a battery cell, the battery cell includes a battery case as described above.

A third aspect of the present invention provides a battery, said battery comprising a battery cell as described above.

The fourth aspect of the present invention provides an electric device, which comprises a battery according to the above

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Fig. 1 schematically shows a schematic structural view of a vehicle according to an embodiment of the present invention;

fig. 2 schematically shows a structural schematic diagram of a battery pack according to an embodiment of the present invention;

fig. 3 schematically shows a structural schematic diagram of a battery module according to an embodiment of the present invention;

fig. 4 schematically shows an exploded structural view of a battery cell according to an embodiment of the present invention;

fig. 5 schematically shows a structural schematic diagram of a battery case according to an embodiment of the present invention;

fig. 6 is a structural schematic view of a case body of the battery case shown in fig. 5;

FIG. 7 isbase:Sub>A cross-sectional view A-A of the housing body shown in FIG. 6;

FIG. 8 is an enlarged view of the portion B of the housing body shown in FIG. 7;

fig. 9 is an enlarged structural view of a portion C of the case body shown in fig. 7.

The reference numbers are as follows:

1000 is a vehicle;

100 is a battery, 200 is a controller, and 300 is a motor;

10 is a battery module, and 20 is a box body;

11 is a battery monomer;

111 is a cover plate;

111a is an electrode terminal;

112 is a shell body;

1121 is an open end;

1122 is a first side wall;

11221 is a thinned region;

11222 is a transition region;

1123 is a second side wall;

1124 is a third side wall;

1125 is an inner bottom surface;

113 is an electric core assembly;

21 is a first part;

and 22 is the second part.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention 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 invention belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "including" and "having," and any variations thereof, in the description and claims of the invention and the above description of the drawings are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present invention, 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 invention, "a plurality" means two or more unless specifically limited 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 invention. 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 invention, the term "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, 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 invention, the term "plurality" refers to two or more (including two), and similarly, "plural groups" 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 invention, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for convenience of description and simplification of the description, but does not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the embodiments of the present invention, unless explicitly specified or limited otherwise, the terms "mounted," "connected," and "fixed" are used in a broad sense, and may be, for example, 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 meaning of the above terms in the embodiments of the present invention 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 expanded.

The applicant notices that the size of the internal space of the battery case directly senses the energy density of the electric core assembly 113, and therefore how to increase the internal space of the battery case becomes a technical problem to be solved by those skilled in the art.

In order to solve the problem of increasing the internal space of the battery case, the applicant has studied and found that at least one thinned region 11221 may be provided inside the case body 112 of the battery case, and the thinned region 11221 is located on the inner wall surface of the case body 112, by providing at least one thinned region 11221 on the inner wall surface of the case body 112, the space inside the case body 112 is increased, when the core assembly 113 is mounted inside the case body 112, the proportion of the core assembly 113 inside the battery case can be increased, and the energy density of the core assembly 113 is increased.

The embodiment of the utility model discloses a battery cell 11 can but not be used for in the electric installation such as vehicle, boats and ships or aircraft. The power supply system including the battery cell 11, the battery 100, and the like disclosed in the present invention may be used to form the electric device.

An embodiment of the utility model provides an use power consumption device of battery 100 as power, power consumption device can be for but not limiting to cell-phone, flat board, notebook computer, electronic toy, electric tool, storage battery car, electric automobile, steamer, spacecraft and so on. 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.

It should be understood that the technical solutions described in the embodiments of the present invention are not only limited to be applied to the above described batteries and electric devices, but also can be applied to all batteries including a box and electric devices using the batteries.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present invention. 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 starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

In order to meet different power requirements, the battery 100 may include a plurality of battery cells 11, and the battery cells 11 refer to the smallest unit constituting the battery module 10 or the battery pack. A plurality of battery cells 11 may be connected in series and/or in parallel via the electrode terminals 111a to be applied to various applications. The battery mentioned in the present invention includes a battery module 10 or a battery pack. The plurality of battery cells 11 may be connected in series, in parallel, or in series-parallel, where series-parallel refers to a mixture of series connection and parallel connection. The battery 100 may also be referred to as a battery pack. The embodiment of the utility model provides an in a plurality of battery monomer 11 can directly constitute the battery package, also can constitute battery module 10 earlier, battery module 10 constitutes the battery package again.

Fig. 2 shows a schematic structural diagram of a battery 100 according to an embodiment of the present invention. In fig. 2, the battery 100 may include a plurality of battery modules 10 and a case 20, and the plurality of battery modules 10 are accommodated inside the case 20. The case 20 serves to accommodate the battery cells 11 or the battery module 10 to prevent liquid or other foreign substances from affecting the charge or discharge of the battery cells 11. The box 20 can be simple spatial structure such as solitary cuboid or cylinder or spheroid, also can be the complicated spatial structure that simple spatial structure such as cuboid or cylinder or spheroid made up and form, the embodiment of the utility model provides a do not restrict to this. The material of the box body 20 may be an alloy material such as an aluminum alloy, an iron alloy, etc., or a polymer material such as a polycarbonate, a polyisocyanurate foam, etc., or a composite material such as a glass fiber and an epoxy resin, which is not limited in the embodiment of the present invention.

In some embodiments, the case 20 may include a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 cover each other, and the first portion 21 and the second portion 22 together define a space for accommodating the battery cell 11. The second part 22 may be a hollow structure with one open end, the first part 21 may be a plate-shaped structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a space for accommodating the battery cell 11; the first portion 21 and the second portion 22 may be both hollow structures with one side open, and the open side of the first portion 21 may cover the open side of the second portion 22.

Fig. 3 shows a schematic structural diagram of the battery module 10 according to an embodiment of the present invention. In fig. 3, the battery module 10 may include a plurality of battery cells 11, the plurality of battery cells 11 may be connected in series or in parallel or in series-parallel to form the battery module 10, and the plurality of battery modules 10 may be connected in series or in parallel or in series-parallel to form the battery 100. The utility model discloses in, battery cell 11 can include lithium ion battery, sodium ion battery or magnesium ion battery etc, the embodiment of the utility model provides a not inject to this. The battery cell 11 may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., and the embodiment of the present invention is not limited thereto. The battery cells 11 are generally divided into three types in an encapsulated manner: cylindricality battery monomer 11, square battery monomer 11 and laminate polymer battery monomer 11 of square body, the embodiment of the utility model provides a do not restrict to this yet. However, for the sake of brevity, the following embodiments are described by taking the square battery cell 21 as an example.

Fig. 4 is an exploded schematic view of a battery cell 21 according to some embodiments of the present invention. The battery cell 11 refers to the smallest unit constituting the battery 100. As shown in fig. 4, the battery cell 11 includes a cover plate 111, a case body 112, and a battery cell assembly 113.

The cover plate 111 refers to a member that covers the opening of the case body 112 to isolate the internal environment of the battery cell 11 from the external environment. Without limitation, the shape of the cover plate 111 may be adapted to the shape of the case body 112 to fit the case body 112. Alternatively, the cover plate 111 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the cover plate 111 is not easily deformed when being impacted by the extrusion, and the battery cell 11 may have higher structural strength and improved safety. The cap plate 111 may be provided with functional components such as electrode terminals 111 a. The electrode terminal 111a may be used to be electrically connected with the electric core assembly 113 for outputting or inputting electric power of the battery cell 11. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold value may be further disposed on the cover plate 111. In some embodiments, an insulator may also be provided on the inside of the cover plate 111, and may be used to isolate the electrical connection components within the housing body 112 from the cover plate 111 to reduce the risk of shorting. Illustratively, the insulator may be plastic, rubber, or the like.

The case body 112 is an assembly for cooperating with the cover plate 111 to form an internal environment of the battery cell 11, wherein the formed internal environment may be used to house the cell assembly 113, an electrolyte (not shown in the drawings), and other components. The case body 112 and the cover plate 111 may be separate components, and an opening may be formed in the case body 112, and the cover plate 111 covers the opening at the opening to form an internal environment of the battery cell 11. Without limitation, the cover plate 111 and the housing body 112 may be integrated, and specifically, the cover plate 111 and the housing body 112 may form a common connecting surface before other components are housed, and when it is necessary to enclose the inside of the housing body 112, the cover plate 111 covers the housing body 112. The housing body 112 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical, a hexagonal prism, and the like. Specifically, the shape of the case body 112 may be determined according to the specific shape and size of the core assembly 113. The material of the shell body 112 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention does not specially limit the material.

The cell assembly 113 is a component in which electrochemical reactions occur in the battery cells 11. One or more electrical core assemblies 113 may be contained within the housing body 112. The core assembly 113 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 main body portion of the cell assembly 113, and the portions of the positive and negative electrode tabs having no active material each constitute a tab (not shown in the drawings). 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, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminal 111a to form a current loop.

According to some embodiments of the present invention, as shown in fig. 5 to 9, the battery case includes a case body 112 having an open end 1121, at least one thinning region 11221 is provided on an inner wall surface of the case body 112, and the thinning region 11221 is spaced apart from the open end 1121.

Specifically, at least one thinned region 11221 is provided inside the case body 112, and the thinned region 11221 is located on the inner wall surface of the case body 112, and by providing at least one thinned region 11221 on the inner wall surface of the case body 112, the space inside the case body 112 is increased, and when the cell assembly is mounted inside the case body 112, the proportion of the cell assembly inside the battery case can be increased, so that the energy density of the cell assembly is increased.

It should be understood that, under the premise that the external structure and size of the case body 112 are not changed, at least one thinned region 11221 is formed on the inner wall surface of the case body 112, so as to increase the internal space of the case body 112, and thus the internal space of the battery case is increased.

It should be noted that, in the present invention, the formation of the thinned region 11221 can be realized by removing the material from the inner wall surface of the case body 112 on the premise of the normal wall thickness, and the thinned region 11221 can be directly formed at a desired position when the integral forming of the case is performed.

Additionally, the number of thinned regions 11221 may be one, two, three … …; when the number of the thinned regions 11221 is two or more, the shapes and sizes of the thinned regions 11221 may be completely the same, partially the same, or completely different; when the number of the thinned regions 11221 is two or more, the thinned regions 11221 may be provided independently of each other, partially connected, or entirely connected.

In some embodiments of the present disclosure, the inner wall surface includes an inner sidewall, and the at least one thinned region 11221 is disposed on the inner sidewall.

Specifically, as shown in fig. 7 and 8, the inner wall surface of the case body 112 includes an inner side wall, the inner side wall of which is provided in the height direction of the case body 112, the inner side wall being provided in the length or width direction of the internal space of the case body 112, and when the inner side wall is located in the width direction of the internal space, by providing a thinned region 11221 on the inner side wall, the size of the internal space in the width direction of the case body 112 is increased; when the inner side wall is located in the longitudinal direction of the internal space, the size of the internal space in the longitudinal direction of the case body 112 is increased by providing the thinned region 11221 on the inner side wall; when the thinned region 11221 is provided on the inner side wall in both the width direction and the length direction of the internal space, the size of the internal space in both the length direction and the width direction of the case body 112 can be increased.

Through setting up attenuate area 11221 on the inside wall of casing body 112 to can make the inner space of casing body 112 obtain increasing in width and/or length direction, improve electric core subassembly when installing in the battery case the empty ratio of occupying of electric core subassembly, make electric core subassembly's energy density obtain improving.

It should be noted that, in the present invention, when the shell body 112 has an inner side wall, the thinning region 11221 may be provided with one, two or more inner side walls; when the case body 112 has two or more inner side walls, the thinned region 11221 may be provided on one inner side wall, may be provided on a part of the inner side wall, may be provided on all the inner side walls, and the number of the thinned regions 11221 that may be provided on one inner side wall may be one, two, or more.

In addition, the housing body 112 further includes an inner bottom surface 1125, and a corresponding thinned region 11221 may be disposed on the inner bottom surface 1125, so as to achieve the purpose of expanding the volume of the housing body 112.

In some embodiments of the present invention, the inner sidewall includes a first sidewall 1122 and a second sidewall 1123, the area of the first sidewall 1122 is larger than the area of the second sidewall 1123, and a thinning region 11221 is provided on the first sidewall 1122.

Specifically, in the embodiment of the present invention, the first side wall 1122 and the second side wall 1123 are included in the inner wall surface of the case body 112, and the thinning region 11221 is provided on the first side wall 1122 having a large area, and by providing the thinning region 11221 on the first side wall 1122 having a large area, the ratio of the increase of the internal space of the battery case on the side of the first side wall 1122 is larger than that of the other inner side walls, and the internal space of the battery case is further increased.

It is noted that the first and second sidewalls 1122 and 1123 may be disposed adjacent to each other, spaced apart from each other, or opposite to each other.

In some embodiments of the present disclosure, as shown in fig. 8, the thickness of the first sidewall 1122 is T1, and the thickness of the thinned region 11221 is T2, wherein T2= T1- Δ, and Δ ≧ 0.03mm.

Specifically, the thinned region 11221 is provided on the first side wall 1122, that is, the first side wall 1122 having a normal wall thickness is thinned, the normal wall thickness of the first side wall 1122 is T1, the wall thickness of the thinned region 11221 is T2, and by setting the relationship between T1 and T2, that is, T2= T1- Δ, Δ ≧ 0.03mm, the strength of the battery case is ensured on the basis of increasing the internal space of the battery case.

It should be noted that, in the utility model discloses in, first lateral wall 1122 is even wall thickness, and attenuate region 11221 is also even wall thickness, wherein, the numerical value of delta can be 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 1mm … …, it is that the numerical value of delta is bigger, the wall thickness of attenuate region 11221 is thinner, consequently through the numerical value of reasonable control delta, on the basis of the realization at increase battery case's inner space, make battery case's intensity obtain the assurance.

In some embodiments of the present invention, as shown in fig. 8 and 9, the inner sidewall further includes a third sidewall 1124, the third sidewall 1124 is disposed opposite to the first sidewall 1122, and the thickness of the third sidewall 1124 is T3, wherein T3 > T2.

In the embodiment of the present invention, the housing body 112 is a rectangular structure, and the housing body 112 having the rectangular structure has an inner bottom 1125 and four sidewalls, i.e. a first sidewall 1122, a second sidewall 1123, a third sidewall 1124 and a fourth sidewall (not shown in the figure), wherein the first sidewall 1122 is disposed opposite to the third sidewall 1124, the second sidewall 1123 is disposed opposite to the fourth sidewall, and the first sidewall 1122 and the second sidewall 1123 are disposed adjacently. The thinned region 11221 is disposed on the first sidewall 1122, and the thickness T3 of the third sidewall 1124 is greater than the thickness T2 of the thinned region 11221, it is ensured that the overall strength of the battery case is enhanced on the basis of increasing the internal space of the battery case by the structure in which the third sidewall 1124 and the third sidewall 1124 are disposed.

It should be understood that the first side wall 1122 is opposite to the third side wall 1124, the thinned region 11221 is disposed on the first side wall 1122, and the third side wall 1124 is not thinned, so that the strength of the third side wall 1124 is greater than that of the first side wall 1122, and the third side wall 1124 is used to form an auxiliary support for the first side wall 1122, so that the ability of the battery case to resist the crush deformation is ensured, and the strength of the battery case is prevented from being reduced due to the provision of the thinned region 11221.

It should be noted that the side of the thinned region 11221 disposed on the first sidewall 1122 close to the second sidewall 1123 may intersect with the second sidewall 1123, may be spaced from the second sidewall 1123, and the side of the thinned region 11221 close to the fourth sidewall may intersect with the fourth sidewall, and may be spaced from the fourth sidewall, and by controlling the extension length of both sides (the side close to the second sidewall 1123 and the side close to the fourth sidewall) of the thinned region 11221, the area of the thinned region 11221 can be adjusted, so that the adjustment of the internal space of the case body 112 can be further achieved.

In addition, in the present invention, the third side wall 1124 is a uniform thickness side wall, and the thickness of the third side wall 1124 may be equal to or different from the thickness of the first side wall 1122, and as a specific embodiment, the thickness of the third side wall 1124 is equal to the thickness (non-thinning region) of the first side wall 1122, so as to improve the convenience of processing.

In some embodiments of the present invention, as shown in fig. 7, inner wall surface further includes an inner bottom surface 1125, and thinned region 11221 intersects inner bottom surface 1125.

Specifically, the inner wall surface of the case body 112 further has an inner bottom surface 1125, the thinned region 11221 is disposed on the inner side surface, and the thinned region 11221 extends toward one side of the inner bottom surface 1125 and intersects with the inner bottom surface 1125, that is, the thinned region 11221 extends to the position where the side wall intersects with the inner bottom surface 1125, and by the arrangement manner of the thinned region 11221, the coverage area of the thinned region 11221 in the height direction of the case body 112 can be larger, so that the thinned area of the inner side wall of the case body 112 is further increased, and the space of the battery case is further increased.

In some embodiments of the present disclosure, the inner wall surface further includes an inner bottom surface 1125, and the thinned region 11221 is spaced apart from the inner bottom surface 1125.

Specifically, the inner wall surface of the case body 112 further has an inner bottom surface 1125, the thinned region 11221 is opened on the inner side surface, and the thinned region 11221 extends to one side of the inner bottom surface 1125 and is spaced from the inner bottom surface 1125, that is, the end point of the thinned region 11221 extending to one side of the inner bottom surface 1125 is located at a distance from the inner bottom surface 1125, and by arranging the thinned region 11221 at a distance from the inner bottom surface 1125 of the case body 112, the strength of the connection position of the inner side wall and the inner bottom surface 1125 is increased, so that the overall strength of the battery case is ensured.

In some embodiments of the present invention, as shown in fig. 8, a non-thinning region is provided between the thinning region 11221 and the open end 1121, and a transition region 11222 is provided at a connection position of the thinning region 11221 and the non-thinning region.

Specifically, a thinned region 11221 is arranged on the inner side wall of the shell body 112, the region of the inner side wall, which is located outside the thinned region 11221, is a non-thinned region, the thinned region 11221 and the non-thinned region are structurally transited through a transition region 11222, and the transition region 11222 is arranged to prevent stress concentration between the thinned region 11221 and the non-thinned region, so that the overall strength of the battery shell is ensured.

It should be understood that the transition region 11222 is used to connect the transition thinned region 11221 and the non-thinned region, i.e., the transition region 11222 is used to achieve a smooth transition between the thinned region 11221 and the non-thinned region, so as to prevent stress concentration locations in the thinned region 11221 and the non-thinned region, and further prevent the battery case from being broken at the stress concentration locations when the battery case is impacted.

In addition, when the housing body 112 is integrally formed, the transition region 11222 ensures the convenience of demolding, so that the processing operation can be smoothly performed.

In some embodiments of the present invention, transition region 11222 is a beveled structure or a concave curved structure.

Specifically, in some implementations, the transition region 11222 is of an inclined surface structure, that is, the high position of the inclined surface structure is connected to the non-thinning region, the low position of the inclined surface structure is connected to the thinning region, the non-thinning region is smoothly transited to the thinning region by using the inclined surface structure, the inclined surface structure is simple and convenient to process, and the manufacturing cost can be effectively reduced.

It should be noted that the transition region 11222 may be formed as a single piece with the housing body 112 by casting, or may be formed separately at a later time.

In some implementation processes, transition region 11222 is concave cambered surface structure, and the high-order non-attenuate district of connecting of concave cambered surface structure promptly, and the low-order connection attenuate district of concave cambered surface structure utilizes concave cambered surface structure to make the smooth transition of non-attenuate district to attenuate the district, and concave cambered surface structure surface is more smooth mellow and more, does not have corresponding sharp-pointed structure to produce, and then avoids the interference or the fish tail that produce the electric core subassembly in the electric core subassembly installation.

It should be noted that the transition region 11222 in the form of a concave arc-shaped structure may be integrally formed with the shell body 112 by casting, or may be separately formed at a later time.

In some embodiments of the present invention, as shown in fig. 5, the battery case further includes a cover plate 111, and the cover plate 111 is welded to the case body 112 and closes the open end 1121.

Specifically, the open end 1121 of the casing body 112 is disposed on the casing body 112 (top, side, or bottom, etc.), after the battery cell assembly is mounted in the casing body 112, the cover plate 111 is engaged with the casing body 112, the cover plate 111 closes the open end 1121 of the casing body 112, the cover plate 111 is disposed and the open end 1121 of the casing body 112 is closed by welding the cover plate 111 and the casing body 112, so as to form a battery casing structure with isolated inside and outside, so that the battery cell disposed inside the battery casing is effectively isolated from the outside.

It should be noted that the utility model discloses in, be connected fixed mode between apron 111 and the shell body 112 and be the welding, utilize the welding to guarantee the joint strength between apron 111 and the shell body 112 for battery case's bulk strength has obtained the assurance.

In some embodiments of the present invention, as shown in fig. 8, the distance between the non-thinned region and the open end 1121 is L, wherein L =5mm to 6mm.

Specifically, the region outside the thinned region 11221 is a non-thinned region, the wall thickness of the non-thinned region is greater than that of the thinned region 11221, the open end 1121 of the case is transited to the thinned region 11221 through the non-thinned region, and the distance L is set between the non-thinned region and the open end 1121, so that the position of the open end 1121 is prevented from being thinned, the space of the battery case is ensured to be increased, the strength of the open end 1121 is not affected, when the cover plate 111 is fixedly welded to the case body 112, the strength of the welding position can be ensured, and the overall strength of the battery case is ensured.

It should be noted that, in the utility model discloses in, the value of the distance L of non-attenuate region and open end 1121 can be 0.03mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm … … mm, and the numerical value of L is big more promptly, and attenuate region 11221 is farther away from open end 1121, consequently through the numerical value of reasonable control L to the realization is on the basis of increase battery case's inner space, makes battery case's intensity obtain the assurance.

In some embodiments of the present invention, the present invention further provides a battery cell 11, wherein the battery cell 11 includes the battery casing as described above.

In some embodiments of the present invention, the present invention further provides a battery 100, wherein the battery 100 comprises the battery cell 11 as described above.

In some embodiments of the present invention, as shown in fig. 5 to 9, the present invention further provides a battery case including a case body 112 having an open end 1121, the case body 112 is a rectangular case, the rectangular case includes a first side wall 1122, a second side wall 1123, a third side wall 1124 and a fourth side wall, the first side wall 1122 is disposed opposite to the third side wall 1124, the second side wall 1123 is disposed opposite to the fourth side wall, a thinning region 11221 is disposed on the first side wall 1122, the third side wall is an equal-thickness structure, meanwhile, the thinning region 11221 is disposed at an interval from the open end 1121 of the case body 112, a relationship between a thickness T2 of the thinning region 11221 and a thickness T1 of the first side wall 1122 is T2= T1- Δ, Δ ≧ 0.1124 mm, and a relationship between a thickness T3 of the third side wall and a thickness T2 of the thinning region 21 is T3 > T2. Through above-mentioned shell body 112's structure for the inside space of shell body 112 has obtained the increase, and when shell body 112 was installed to the electric core subassembly inside, can improve the electric core subassembly and in the inside proportion of battery case, made the energy density of electric core subassembly obtain improving. In addition, the welding strength between the case body 112 and the cap plate 111, and the overall strength of the battery case can be ensured.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled 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; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. 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 invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. The battery shell is characterized by comprising a shell body with an opening end, wherein at least one thinning region is arranged on the inner wall surface of the shell body, and the thinning region and the opening end are arranged at intervals.

2. The battery case of claim 1, wherein the inner wall surface comprises an inner sidewall, and the at least one thinned region is disposed on the inner sidewall.

3. The battery case according to claim 2, wherein the inner sidewall comprises a first sidewall and a second sidewall, the area of the first sidewall is larger than the area of the second sidewall, and the thinned region is provided on the first sidewall.

4. The battery case according to claim 3, wherein the first sidewall has a thickness T1 and the thinned region has a thickness T2, wherein T2= T1- Δ, Δ ≧ 0.03mm.

5. The battery case of claim 3, wherein the inner sidewall further comprises a third sidewall disposed opposite the first sidewall, the third sidewall having a thickness T3, wherein T3 > T2.

6. The battery case of claim 2, wherein the inner wall surface further comprises an inner bottom surface, and the thinned region intersects the inner bottom surface.

7. The battery case of claim 2, wherein the inner wall surface further comprises an inner bottom surface, and the thinned region is spaced from the inner bottom surface.

8. The battery case according to claim 2, wherein a non-thinned region is provided between the thinned region and the open end, and a transition region is provided at a connecting position of the thinned region and the non-thinned region.

9. The battery case of claim 8, wherein the transition region is a beveled structure or a concave arcuate structure.

10. The battery case of claim 8, wherein the non-thinned region is at a distance L from the open end, wherein L =5mm to 6mm.

11. The battery case as recited in claim 10, further comprising a cover plate welded to the case body and closing the open end.

12. A battery cell, characterized in that the battery cell comprises a battery case according to any one of claims 1 to 11.

13. A battery comprising the battery cell of claim 12.

14. An electric consumer, characterized in that it comprises a battery according to claim 13.

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