CN218939911U - Bottom support structure, battery monomer, battery and power utilization device - Google Patents

Abstract

The application relates to a collet structure, battery monomer, battery and power consumption device, the collet structure includes: a collet portion and at least two guard portions. The bottom support part is used for supporting the bottom of the electrode assembly. At least two protection parts are respectively arranged on two opposite sides of the bottom support part along the preset direction. Pre-supporting the bottom support part on the bottom of the electrode assembly during the assembly of the battery cells; next, the electrode assembly and the shoe structure are inserted together into the case. Because the protection parts which can be bent are respectively arranged on the two opposite sides of the bottom support part along the preset direction, the protection parts after bending can be protected at the corresponding edge of the bottom of the electrode assembly in the shell entering process, the electrode assembly with fluffy or high group margin is prevented from being in direct contact with the shell, the damage probability of the bottom of the electrode assembly in the shell entering process is reduced, the electrode assembly is convenient to enter the shell, and the product reliability of the battery cell is improved.

Description

Bottom support structure, battery monomer, battery and power utilization device

Technical Field

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

Background

With the rapid development of power battery technology, the demand for the power battery is increased, and the demand for the power battery is also increased. The battery cell, which is a small unit composed of a battery, mainly includes an electrode assembly and a case, and the electrode assembly is usually received in the case in such a manner that the bottom of the electrode assembly is inserted into the case during assembly.

However, during assembly, the bottom of the electrode assembly is often difficult to be put into the case, resulting in easy scratching by the case, severely affecting the product reliability of the battery cell.

Disclosure of Invention

Based on this, it is necessary to provide a base structure, a battery cell, a battery and an electric device, which facilitate the electrode assembly to be put into the case, reduce the damage probability when put into the case, and improve the product reliability of the battery cell.

In a first aspect, the present application provides a shoe structure for introducing an electrode assembly into a housing, comprising: a base part for supporting the bottom of the electrode assembly; at least two protection parts respectively arranged on two opposite sides of the bottom support part along the preset direction; each protection part is configured to bend towards the same direction relative to the bottom support part so as to protect the corresponding edge of the bottom of the electrode assembly.

In the above-mentioned shoe structure, the shoe portion is held in advance on the bottom of the electrode assembly during the assembly process of the battery cells; next, the electrode assembly and the shoe structure are inserted together into the case. Because the protection parts which can be bent are respectively arranged on the two opposite sides of the bottom support part along the preset direction, the protection parts after bending can be protected at the corresponding edge of the bottom of the electrode assembly in the shell entering process, the electrode assembly with fluffy or high group margin is prevented from being in direct contact with the shell, the damage probability of the bottom of the electrode assembly in the shell entering process is reduced, the electrode assembly is convenient to enter the shell, and the product reliability of the battery cell is improved.

In some embodiments, the shoe portion includes at least two shoe segments connected in sequence along a predetermined direction, the at least two adjacent shoe segments being bendable toward one another. So, design into a plurality of collet sections of buckling with collet portion for go into two adjacent bending pieces of shell in-process and buckle each other, form toper structure or evagination arch structure, play effective direction for going into the shell, convenient equipment operation promotes packaging efficiency.

In some embodiments, a first crease line is defined between at least two adjacent shoe segments. Therefore, a first crease line is arranged between two adjacent collet sections, and the collet sections are convenient to bend along the first crease line.

In some embodiments, the first crease line is provided with a weakening configured to allow two adjacent shoe segments to start bending along the first crease line. In this way, the weakening part is arranged at the first crease line, so that the first crease line is easier to bend, and the guiding function of the bottom support part is easier to play; simultaneously, set up the weakening portion, also make collet portion more easily deformation to can better adapt to the extrusion deformation of electrode subassembly income shell in-process.

In some embodiments, the weakened portion includes a plurality of openings, all of which are spaced apart along the length of the first crease line. So, set up a plurality of trompils in first crease line department, weaken the structural strength of collet portion in first crease department for collet portion is more easy to buckle along first crease line.

In some embodiments, the spacing between two adjacent openings is denoted as D, where 0.4 mm.ltoreq.D.ltoreq.1 mm. Therefore, the space D is reasonably controlled, and on the premise that breakage of the bottom support portion is not easy to occur, the structural strength is effectively weakened, so that the bottom support portion is bent in the shell entering process.

In some embodiments, the pore area of the openings is denoted as S, where 0.071mm ² ≤S≤0.196 mm ² . In this way, the hole area of the single hole is reasonably controlled, so that the structural strength of the first crease line is reasonably weakened, and the bottom support part can be folded along the first creaseThe trace is folded.

In some embodiments, the weakened portion includes a thinned recess extending along a length of the first crease line. Therefore, the thickness of the first crease line is thinned by the thinning concave part, so that the first crease line is easier to bend.

In some embodiments, the minimum thickness of the shoe segment at the thinned recess is denoted as h1, the thickness of the shoe segment outside the thinned recess is denoted as h2, and the conditions satisfied between h1 and h2 are: h1/h2 is more than or equal to 14% and less than or equal to 25%. Therefore, the ratio of h1/h2 is reasonably controlled, so that the first crease line is reasonably weakened, and the bottom support is convenient to bend at the first crease line.

In some embodiments, the thickness of each guard is denoted as h3, the thickness h3 decreasing from the end of the guard where the shoe is connected to the shoe to the end of the guard where the shoe is remote from the shoe. Therefore, the thickness of the protection part is gradually reduced, the tilted protection part is prevented from occupying the space inside the shell, and the electrode assembly is prevented from being broken down due to overlarge local expansion stress in the circulating process.

In some embodiments, the bottom support portion and/or the at least one protection portion is provided with a through hole penetrating through the bottom support structure in a thickness direction thereof. Thus, through holes are provided in the base portion and/or the guard portion so that the electrolyte solution wets the electrode assembly.

In a second aspect, the present application provides a battery cell comprising: a housing having a chamber therein; an electrode assembly accommodated in the chamber; the shoe structure of any one of the above claims, wherein the shoe portion is located between the bottom of the electrode assembly and the bottom wall of the chamber, and the folded guard portion is located between the side surface of the electrode assembly and the side wall of the chamber.

In some embodiments, the width of the shoe portion along the preset direction is denoted as W1, the width of the shoe structure along the preset direction is denoted as W2, and the thickness of the electrode assembly along the thickness direction thereof is denoted as h0, wherein W1 < h0, and W2 > h0. Thus, the dimensional relationship between the collet structure and the electrode assembly is reasonably controlled, so that the tilted protection part can act on the edge, and an effective protection effect is realized.

In some embodiments, the dimension of the case interior space in the thickness direction of the electrode assembly is denoted as h4, where W1 < h4, and W2 > h4. Thus, the dimensional relationship between the collet structure and the electrode assembly is reasonably controlled, so that the electrode assembly is better arranged in the shell under the leading-in of the collet structure.

In a third aspect, the present application provides a battery comprising any one of the above battery cells.

In a fourth aspect, the present application provides an electrical device comprising the above battery for providing electrical energy.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other 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. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. 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 pack provided in some embodiments of the present application;

fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of an electrode assembly according to some embodiments of the present disclosure prior to being encased;

FIG. 5 is a schematic view of an electrode assembly according to some embodiments of the present application during a process of encasing;

FIG. 6 is a schematic illustration of an electrode assembly according to some embodiments of the present disclosure after being encased;

FIG. 7 is a perspective view of a shoe structure according to some embodiments of the present application;

fig. 8 is another view of a shoe structure provided in some embodiments of the present application.

1000. A vehicle; 100. a battery; 10a, a battery pack; 200. a controller; 300. a motor; 10. a battery cell; 20. a case; 201. a first portion; 202. a second portion; 1. a bottom support structure; 11. a bottom support part; 111. a shoe section; 112. a first crease line; 11a, weakened portions; 113. opening holes; 114. thinning the concave part; 12. a protective part; 121. a second crease line; 122. a through hole; 2. an electrode assembly; 21. edges; 3. a housing; 31. an opening; 32. a chamber; 4. an end cap; 41. an electrode terminal; x, presetting a direction; y, length direction; z, thickness direction.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

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 "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are 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 sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Currently, the application of power batteries is more widespread 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, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The applicant notes that, in order to obtain higher energy density, the group margin of the battery cells is larger and larger, and the whole electrode assembly is in a fluffy state, so that when the electrode assembly is inserted into the shell, the bottom of the electrode assembly is easily scratched with the shell, which not only causes difficult shell entering of the electrode assembly and affects the assembly efficiency; and scratch the electrode assembly easily in the process of rubbing, seriously influence the product reliability of the battery monomer.

In order to facilitate the electrode assembly to enter the shell, a square lithium battery cell entering auxiliary device is designed, the bottom shape of a rectangular groove is kept consistent with the top cover of a battery cell, and a cavity capable of accommodating the protruding part of the top cover is arranged in the rectangular groove. Thus, the electrode assembly is fixed at a specific position in the groove when being put into the shell through the rectangular groove, so that the positioning capability is improved, and the shell-putting precision is improved. However, although the positioning accuracy can be improved by the shell-in auxiliary mode, the rectangular groove cannot realize protection or tightening effect on the bottom of the fluffy or high-group-margin electrode assembly, so that the electrode assembly is still easy to scratch and damage when being in the shell.

Based on the above, in order to solve the problem that the electrode assembly is still easy to scratch by the shell and damage when being put into the shell, the applicant has conducted intensive studies and designed a bottom support structure for supporting the bottom support part at the bottom of the electrode assembly; and then the bent protecting part is used for protecting the corresponding edge of the bottom of the electrode assembly. Therefore, in the shell entering process, the edge of the bottom of the electrode is contacted with the inner wall of the shell through the protection part, so that the edge of the bottom of the electrode assembly is prevented from being directly scratched with the shell, and the damage probability of the electrode assembly in the shell entering process is effectively reduced.

Meanwhile, the bottom of the electrode assembly is protected by the bottom support structure in the shell entering process, so that the electrode assembly is not required to be accurately positioned in an opening of the shell before entering the shell, and even if positioning deviation occurs, the edge of the bottom of the electrode assembly is not scratched by the inner wall of the shell. Thus, the electrode assembly is greatly convenient for the operation of entering the shell.

In addition, when the electrode assembly is put into the shell, the inner wall of the shell can extrude the bottom of the electrode assembly through the protection part, and a certain tightening effect is provided for the bottom of the electrode assembly, so that the electrode assembly is easier to be guided into the shell under the action of the bottom support structure.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. A power supply system having a battery cell, a battery, or the like disclosed in the present application, which constitutes the power utilization device, may be used.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization 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 car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of 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 be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000. Meanwhile, the battery 100 may be a battery module; or may be a battery pack 10a.

Referring to fig. 2, fig. 2 is an exploded view of a battery pack 10a according to some embodiments of the present disclosure. The battery pack 10a includes a case 20 and a battery cell 10, and the battery cell 10 is accommodated in the case 20. The case 20 is used to provide an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, the first portion 201 and the second portion 202 being overlapped with each other, the first portion 201 and the second portion 202 together defining an accommodating space for accommodating the battery cell 10. The second portion 202 may be a hollow structure with one end opened, the first portion 201 may be a plate-shaped structure, and the first portion 201 covers the opening side of the second portion 202, so that the first portion 201 and the second portion 202 together define an accommodating space; the first portion 201 and the second portion 202 may also be hollow structures each having an opening 31 on one side, and the opening side of the first portion 201 is engaged with the opening side of the second portion 202. Of course, the case 20 formed by the first portion 201 and the second portion 202 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the number of the battery cells 10 may be plural, and the plural battery cells 10 may be connected in series, parallel, or series-parallel, and series-parallel refers to both of the plural battery cells 10 being connected in series and parallel. The plurality of battery cells 10 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 10 is accommodated in the box body 20; of course, the battery 100 may be a form of a plurality of battery cells 10 connected in series or parallel or series-parallel to form a battery 100 module, and a plurality of battery 100 modules connected in series or parallel or series-parallel to form a whole and accommodated in the case 20. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 10.

Wherein each battery cell 10 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 10 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is a schematic exploded 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 4, a case 3, an electrode assembly 2, and other functional components.

The end cap 4 refers to a member that is covered at the opening 31 of the case 3 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 4 may be adapted to the shape of the housing 3 to fit the housing 3. Optionally, the end cover 4 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 4 is not easy to deform when being extruded and collided, so that the battery cell 10 can have higher structural strength, and the safety performance can be improved. The end cap 4 may be provided with functional parts such as electrode terminals 41. The electrode terminals 41 may be used to be electrically connected with the electrode assembly 2 for outputting or inputting electric power of the battery cell 10. In some embodiments, the end cap 4 may also 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. The material of the end cap 4 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 4, which may be used to isolate electrical connection components within the housing 3 from the end cap 4 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case 3 is an assembly for cooperating with the end cap 4 to form an internal environment of the battery cell 10, wherein the formed internal environment may be used to accommodate the electrode assembly 2, electrolyte, and other components. The case 3 and the end cap 4 may be separate components, and an opening 31 may be provided in the case 3, and the opening 31 may be closed by the end cap 4 at the opening 31 to form the internal environment of the battery cell 10. It is also possible to integrate the end cap 4 and the housing 3, but in particular, the end cap 4 and the housing 3 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 3, the end cap 4 is then put into place with the housing 3. The housing 3 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 3 may be determined according to the specific shape and size of the electrode assembly 2. The material of the housing 3 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 2 is a component in which electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 2 may be contained within the case 3. The electrode assembly 2 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 electrode sheet and the negative electrode sheet having the active material constitute the main body portion of the electrode assembly 2, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal 41 to form a current loop.

Optionally, referring to fig. 4, a shoe structure 1 is provided for introducing an electrode assembly 2 into a housing 3 according to some embodiments of the present application. The shoe structure 1 includes: the base portion 11 and at least two guard portions 12. The bottom support 11 is for supporting the bottom of the electrode assembly 2; at least two protecting portions 12 are respectively disposed on opposite sides of the base portion 11 along the preset direction X. Each protecting portion 12 is configured to bend in the same direction relative to the base portion 11, so as to protect the corresponding edge 21 of the bottom of the electrode assembly 2.

The base 11 refers to a member for supporting the electrode assembly 2, and the base 11 remains in the case 3 as a part of the structure in the battery cell 10 when the electrode assembly 2 is mounted in the case 3. The bottom support 11 may be identical to the bottom of the electrode assembly 2, i.e., the shape and area are identical; of course, the base 11 may also be inconsistent with the bottom of the electrode assembly 2, such as: the bottom of the electrode assembly 2 also has a portion that extends beyond or beyond the bottom of the electrode assembly 2 when the bottom of the electrode assembly 2 is supported by the bottom support 11.

The guard 12 refers to a member that can provide a guard function to the edge 21 of the bottom of the electrode assembly 2, such as: after the protecting part 12 is folded up against the base part 11, it is spaced between the edge 21 of the bottom of the electrode assembly 2 and the inner wall of the case 3 to achieve a protecting effect. Wherein the bottom of the electrode assembly 2 refers to one end of the electrode assembly 2 in the direction of insertion into the case 3; and the edge 21 of the bottom of the electrode assembly 2 may be understood as a boundary line of the boundary between the side and bottom of the electrode assembly 2.

The protecting portion 12 can be bent with respect to the base portion 11, so when designing the base structure 1, a material having a certain elasticity or flexibility should be selected, for example: plastic materials which can be bent, such as polycarbonate, PP (polypropylene), PBT (polybutylene terephthalate for polybutylene terephthalate), ABS (Acrylonitrile Butadiene Styrene plastic for acrylonitrile butadiene styrene), can be selected; alternatively, a rubber or the like may be selected. It should be noted that the product forms of the shoe structure 1 of the present application are various, for example: the protection part 12 is not bent and is positioned on the same horizontal plane with the bottom support part 11; or, after the guard portion 12 is bent, a certain angle is formed between the guard portion and the base portion 11.

The number of the guard portions 12 may be two, three or more, but it is required that at least two guard portions 12 are disposed at opposite sides of the shoe portion 11 along the preset direction X. Since the electrode assembly 2 is of a laminated or rolled structure, the bulk or group margin in the thickness direction Z thereof is high, and therefore, when the electrode assembly is put into the case, the most likely place is at the opposite edges 21 of the electrode assembly 2 in the thickness direction Z thereof. For this reason, referring to fig. 4 and 5, when the electrode assembly 2 is put into the case, the bottom support 11 is supported at the bottom of the electrode assembly 2, and the preset direction X is consistent with the thickness direction Z of the electrode assembly 2, so that the at least two protecting portions 12 are bent to protect the two edges 21 that are most easily scratched. Of course, in other embodiments, the predetermined direction X may also be maintained to intersect or be perpendicular to the thickness direction Z of the electrode assembly 2 at the time of the case insertion. When the two directions are perpendicular, the two protecting parts 12 are bent to protect the other edge 21 of the bottom of the electrode assembly 2.

The preset direction X is for the structure of the bottom support 11, and may be multiple directions on the bottom support 11, for convenience of description, taking the square structure of the bottom support 11 as an example, the preset direction X may be the length direction on the bottom support 11; the width direction of the bottom support 11 may be the width direction; and even diagonally on the shoe 11, etc. Of course, in some embodiments, the preset direction X should be different from the thickness direction of the shoe 11, such as the preset direction X intersecting the thickness direction of the shoe 11, etc., considering that the shoe 11 is thinner.

The protection part 12 and the bottom support part 11 can be connected in an assembled mode or in an integrated mode. Wherein, the assembled connection means that the protection part 12 and the bottom support part 11 are connected in a clamping, bolt connection, pin joint, bonding and other modes; the integral connection may be, but is not limited to, extrusion, injection molding, 3D printing, and the like.

In addition, when the guard portion 12 and the shoe portion 11 are integrally formed, crease lines may be provided between the guard portion 12 and the shoe portion 11, or crease lines may not be provided. In particular, in some embodiments, to facilitate bending of the guard portion 12, a second crease line 121 is defined between each guard portion 12 and the base portion 11.

In the shell entering process, the bent protecting part 12 can be protected at the corresponding edge 21 of the bottom of the electrode assembly 2, so that the electrode assembly 2 with fluffy or high group margin is prevented from being in direct contact with the shell 3, the damage probability of the bottom of the electrode assembly 2 in the shell entering process is reduced, the electrode assembly 2 is convenient to enter the shell, and the product reliability of a battery cell is improved.

Optionally, referring to fig. 5, according to some embodiments of the present application, the shoe portion 11 includes at least two shoe segments 111 sequentially connected along a preset direction X. At least two adjacent shoe segments 111 can be bent towards each other.

The shoe section 111 refers to a portion of the structure on the shoe portion 11. Since all the shoe segments 111 are sequentially connected along the preset direction X, at least two protecting portions 12 are correspondingly connected to the shoe segments 111 located at the outermost two sides in the preset direction X.

The ability to bend in opposite directions between two adjacent shoe segments 111 is understood to be: the two collet sections 111 are bent in the same direction at the junction of the two collet sections 111, so that the two collet sections 111 are arranged at a certain angle, namely, the two collet sections form a conical structure; or two shoe segments 111 are arranged in an outwardly convex arch. In this way, the bent two collet sections 111 play a guiding role on the casing of the electrode assembly 2, which is beneficial to improving the casing convenience of the electrode assembly 2.

In addition, when the electrode assembly 2 is led into the casing 3 through the shoe structure 1, the casing 3 applies a pressing force from two sides to the middle to the shoe structure 1 when the casing is put into the casing because the electrode assembly 2 is in a fluffy or high group margin design, so that the bottom of the electrode assembly 2 is contracted, and at the moment, two adjacent shoe sections 111 are bent in opposite directions to adapt to the contraction of the bottom of the electrode assembly 2.

The number of collet segments 111 may be two, three, four or more. When the number of the collet sections 111 is three or more, the number of positions where the collet 11 can be bent is increased, so that the collet 11 can be bent better.

The collet 11 is designed into a plurality of bendable collet sections 111, so that two adjacent bending sections are mutually bent in the shell entering process to form a conical structure or an outer convex arch structure, effective guiding is achieved for shell entering, assembly operation is facilitated, and assembly efficiency is improved.

Optionally, referring to fig. 7, a first crease line 112 is defined between at least two adjacent shoe segments 111 according to some embodiments of the present application.

The first crease line 112 refers to a line profile between two adjacent shoe segments 111, and the first crease line 112 may be a straight line or a curved line. During the bending process, two adjacent shoe segments 111 can be folded along the first crease line 112 to form a certain included angle with each other.

Of course, a first crease line 112 may be provided between a portion of two adjacent shoe segments 111; the first crease line 112 is not arranged between the other two adjacent collet sections 111, i.e. no line profile is arranged between the two collet sections 111, and when the two collet sections are needed to be bent, crease can be determined according to the shell-entering requirement.

A first crease line 112 is provided between two adjacent shoe segments 111, facilitating bending of the shoe portion 11 along the first crease line 112.

Optionally, referring to fig. 7, a weakened portion 11a is provided on the first crease line 112 according to some embodiments of the present application. The weakened portion 11a is configured to allow the two adjacent shoe segments 111 to begin to bend along the first crease line 112.

The weakened portion 11a is to weaken the structural strength of the shoe portion 11 at the first crease line 112, so that it is easier to bend. The design of the weakened portion 11a is various, such as: the weakened portion 11a may be a hole or groove-like structure to weaken the structure at the first crease line 112, or the like.

The weakening portion 11a is arranged at the first crease line 112, so that the first crease line 112 is easier to bend, and the guiding function of the bottom support portion 11 is easier to exert; at the same time, the weakening portion 11a is provided, so that the shoe portion 11 is more easily deformed, so that the electrode assembly 2 can be better adapted to the extrusion deformation in the process of being put into the shell.

Optionally, referring to fig. 7, the weakened portion 11a includes a plurality of openings 113 according to some embodiments of the present application. All the openings 113 are arranged at intervals along the longitudinal direction Y of the first crease line 112.

The provision of the opening 113 at the first crease line 112 corresponds to reducing the structure at the first crease, weakening the structural strength of the shoe 11 at the first crease. The number of the openings 113 may be not particularly limited, and may be determined according to the actual size of the first crease line 112.

The opening 113 may be blind hole design at the first crease line 112; may also be designed as a via 122. When the opening 113 has the structure of the through hole 122, the electrolyte in the case 3 can infiltrate the electrode assembly 2 through the opening 113.

The first crease line 112 is provided with a plurality of openings 113, so that the structural strength of the bottom support 11 at the first crease line 112 is weakened, and the bottom support 11 is easier to bend along the first crease line 112.

Alternatively, referring to FIG. 7, the spacing between two adjacent openings 113 is denoted as D, where 0.4 mm.ltoreq.D.ltoreq.1 mm, according to some embodiments of the present application.

If the distance D is too small, the holes 113 are too dense, which increases the punching workload; but also easily causes breakage of the shoe 11. If the distance D is too large, the structural effect cannot be effectively weakened. The interval D of this application is controlled between 0.4mm ~1mm, say: the spacing D may be, but is not limited to, 0.4mm or 1mm, etc. In particular to some embodiments, the spacing D may be 1mm.

The spacing D is reasonably controlled, and on the premise that breakage of the bottom support 11 is not easy to occur, the structural strength is effectively weakened, so that the bottom support 11 is bent in the shell entering process.

Optionally, referring to fig. 7, the hole area of the hole 113 is denoted as S, wherein 0.071mm according to some embodiments of the present application ² ≤S≤0.196 mm ² 。

The shape of the opening 113 can be designed in various ways, such as: the shape of the aperture 113 may be, but is not limited to, circular, oval, triangular, quadrilateral, etc. When the shape of the opening 113 is circular, the diameter of the opening 113 is 0.3mm to 0.5mm. To facilitate understanding of the hole area S of the openings 113, taking fig. 7 as an example, a cross-sectional line is formed in one of the openings 113 in fig. 7, and the area occupied by the cross-sectional line is the hole area S of the opening 113.

The hole area of the single opening 113 is reasonably controlled so that the structural strength at the first crease line 112 is reasonably weakened, thereby enabling the shoe portion 11 to be bent along the first crease line 112.

Optionally, referring to fig. 7, the weakened portion 11a includes a thinned recess 114, according to some embodiments of the present application. The thinning concave section 114 is provided to extend in the longitudinal direction Y of the first crease line 112.

The thinned concave portion 114 is a concave structure extending in the longitudinal direction Y of the first crease line 112, and is capable of thinning the thickness of the first crease line 112 and weakening the structural strength thereof. Meanwhile, the thinning concave part 114 may be provided on one side surface of the shoe part 11, or may be provided on opposite sides of the shoe part 11 at the same time.

By thinning the recess 114, the thickness at the first crease line 112 is thinned, making it more susceptible to bending.

Optionally, referring to fig. 8, the minimum thickness of the collet section 111 at the thinned recess 114 is denoted as h1, the thickness of the collet section 111 outside the thinned recess 114 is denoted as h2, and the conditions satisfied between h1 and h2 are: h1/h2 is more than or equal to 14% and less than or equal to 25%.

h1/h2 represents the ratio of the thickness after thinning to the thickness before thinning at the first crease line 112, and may be defined by a thinning ratio, for example: thinning 75% -86% at the first crease line 112, and the like.

The ratio of h1/h2 may be a value between 14% and 25%, such as: h1/h2 may be 14% or 25% or the like.

The ratio of h1/h2 is reasonably controlled, so that the first crease line 112 is reasonably weakened, and the bottom support 11 is convenient to bend at the first crease line 112.

Optionally, referring to fig. 8, the thickness of each guard 12 is denoted as h3 according to some embodiments of the present application. The thickness h3 gradually decreases from the end of the shielding portion 12 connected to the shoe portion 11 to the end of the shielding portion 12 distant from the shoe portion 11.

The guard 12 presents a thick end and a thin end structure, such as: the protecting part 12 can be in a trapezoid, triangle, a part of ellipse and the like. When the protection portion 12 is designed in a trapezoid, the protection portion 12 may be in a right trapezoid or a non-right trapezoid. The protection 12 of a non-right trapezoid is understood to be: the opposite sides of the guard 12 are inclined.

In designing the skiving protection portion 12, the thickness of the end of the protection portion 12 away from the shoe portion 11 may be determined according to the actual size of the shoe structure 1, for example: the thickness of the end of the guard portion 12 remote from the shoe portion 11 may be 0.1mm.

The thickness of the protecting part 12 is gradually reduced, so that the raised protecting part 12 occupies the space inside the shell 3, and the electrode assembly 2 is prevented from being broken down due to overlarge local expansion stress in the circulating process, for example: the capacity of the electrode assembly 2 decreases, the cycle life decreases, etc.

Optionally, referring to fig. 7, a through hole 122 is formed in the bottom support 11 and/or the at least one protection portion 12 along the thickness direction Z of the bottom support structure 1 according to some embodiments of the present application.

The through hole 122 may be provided on the shoe portion 11; or may be provided on the guard 12, etc. Through holes 122 are provided in the base structure 1 in order to allow the electrolyte in the case 3 to permeate through the through holes 122 to the electrode assembly 2 for effective infiltration.

Through holes 122 are provided in the base portion 11 and/or the shielding portion 12 so that the electrolyte solution infiltrates through the electrode assembly 2.

Referring to fig. 6, according to some embodiments of the present application, a battery cell 10 is provided, where the battery cell 10 includes: the case 3, the electrode assembly 2, and the shoe structure 1 in any of the above aspects. The housing 3 has a chamber 32 therein. The electrode assembly 2 is accommodated in the chamber 32. The bottom support 11 is located between the bottom of the electrode assembly 2 and the bottom wall of the chamber 32, and the folded guard 12 is located between the side of the electrode assembly 2 and the side wall of the chamber 32.

After the battery cell 10 is assembled, the base structure 1 is held in the housing 3 as a part of the structure of the battery cell 10.

Optionally, referring to fig. 4 and 7, the width of the bottom support 11 along the preset direction X is denoted as W1, the width of the bottom support structure 1 along the preset direction X is denoted as W2, and the dimension of the electrode assembly 2 along the thickness direction Z is denoted as h0, wherein W1 < h0, and W2 > h0.

W1 < h0, and W2 > h0, which indicates that the guard 12 can act just on the edge 21 of the bottom of the electrode assembly 2 when bent and tilted.

The dimensional relationship between the shoe structure 1 and the electrode assembly 2 is reasonably controlled so that the raised guard 12 can act on the edge 21 to achieve effective guard action.

According to some embodiments of the present application, alternatively, the thickness of the internal space of the case 3 in the thickness direction Z of the electrode assembly 2 is denoted as h4, where W1 < h4, and W2 > h4.

W1 < h4, and W2 > h4, the bottom support 11 can be inserted into the shell 3, but the protecting part 12 is blocked by the end of the shell 3, so that the protecting part bends and tilts. At this time, the tilted guard 12 abuts against the edge 21 of the electrode assembly 2, and as the insertion into the case continues, the guard 12 continues to bend and press the bottom of the electrode assembly 2, so that the electrode assembly 2 is stably mounted into the case 3 under the guidance of the shoe structure 1.

The dimensional relationship between the shoe structure 1 and the electrode assembly 2 is reasonably controlled so that the electrode assembly 2 is better loaded into the housing 3 under the introduction of the shoe structure 1.

According to some embodiments of the present application, there is provided a battery 100 including the battery cell 10 in any of the above aspects.

According to some embodiments of the present application, there is provided an electrical device including the above battery 100, the battery 100 being configured to provide electrical energy.

Referring to fig. 4 to 8, a shoe structure 1 is provided according to some embodiments of the present application. First crease lines 112 and second crease lines 121 are provided in the middle and both sides of the shoe structure 1, respectively, to form a shoe portion 11 and a protective portion 12 on both sides. The bottom bracket structure 1 is easier to fold by punching, local thinning and the like on the first crease line 112 and/or the second crease line 121; at the same time, the guard 12 is gradually thinned from inside to outside.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (16)

1. A shoe structure for introducing an electrode assembly (2) into a case (3), characterized by comprising:

a base (11) for supporting the bottom of the electrode assembly (2);

at least two protection parts (12) respectively arranged on two opposite sides of the bottom support part (11) along the preset direction (X);

wherein each protection part (12) is configured to bend in the same direction relative to the bottom support part (11) so as to protect the corresponding edge (21) of the bottom of the electrode assembly (2) respectively.

2. The shoe structure according to claim 1, wherein the shoe portion (11) comprises at least two shoe segments (111) connected in sequence along a predetermined direction (X), at least two adjacent shoe segments (111) being bendable towards each other.

3. A shoe construction according to claim 2, characterized in that at least two adjacent shoe segments (111) define a first crease line (112) therebetween.

4. A shoe construction according to claim 3, characterized in that the first crease line (112) is provided with a weakening (11 a), which weakening (11 a) is configured to allow two adjacent shoe segments (111) to start bending along the first crease line (112).

5. A shoe construction according to claim 4, wherein the weakening portion (11 a) comprises a number of openings (113), all of the openings (113) being arranged at intervals along the length direction (Y) of the first crease line (112).

6. A shoe construction according to claim 5, characterized in that the spacing between two adjacent openings (113) is denoted D, wherein 0.4mm +.d +.1 mm.

7. According toThe shoe construction of claim 5, wherein the hole area of the opening (113) is denoted S, wherein 0.071mm ² ≤S≤0.196 mm ² 。

8. A shoe construction according to claim 4, wherein the weakening portion (11 a) comprises a thinning recess (114), the thinning recess (114) being arranged extending in the length direction (Y) of the first crease line (112).

9. The shoe structure according to claim 8, characterized in that the minimum thickness of the shoe segment (111) at the thinning recess (114) is denoted as h1, the thickness of the shoe segment (111) outside the thinning recess (114) is denoted as h2, and the conditions satisfied between h1 and h2 are: h1/h2 is more than or equal to 14% and less than or equal to 25%.

10. A shoe construction according to any one of claims 1-9, characterized in that the thickness of each of the guard sections (12) is denoted h3, the thickness h3 decreasing gradually from the end of the guard section (12) connected to the shoe section (11) to the end of the guard section (12) remote from the shoe section (11).

11. The shoe structure according to any one of claims 1-9, characterized in that the shoe portion (11) and/or at least one of the protective portions (12) is provided with a through hole (122) extending through the thickness direction (Z) of the shoe structure (1).

12. A battery cell, comprising:

a housing (3) having a chamber (32) therein;

an electrode assembly (2) housed in the chamber (32);

the shoe construction (1) according to any one of claims 1-11, the shoe portion (11) being located between the bottom of the electrode assembly (2) and the bottom wall of the chamber (32), the folded guard portion (12) being located between the side of the electrode assembly (2) and the side wall of the chamber (32).

13. The battery cell according to claim 12, wherein the width of the shoe portion (11) in the preset direction (X) is denoted as W1, the width of the shoe structure (1) in the preset direction (X) is denoted as W2, and the thickness of the electrode assembly (2) in the own thickness direction (Z) is denoted as h0, wherein W1 < h0, and W2 > h0.

14. The battery cell according to claim 13, wherein a dimension of the inner space of the case (3) in the thickness direction (Z) of the electrode assembly (2) is denoted as h4, wherein W1 < h4, and W2 > h4.

15. A battery, characterized by comprising a battery cell (10) according to any of claims 12-14.

16. An electrical device, characterized by comprising a battery (100) as claimed in claim 15, said battery (100) being adapted to provide electrical energy.

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