CN219591545U

CN219591545U - Battery monomer, battery and power consumption device

Info

Publication number: CN219591545U
Application number: CN202320153808.8U
Authority: CN
Inventors: 柯海波; 陈燕琳; 李全坤; 杨开焕; 余帆; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-01-19
Filing date: 2023-01-19
Publication date: 2023-08-25
Anticipated expiration: 2033-01-19

Abstract

The application discloses a battery monomer (10), a battery and an electric device. The battery cell (10) comprises: a housing (100) and a barrier (130), the housing (100) having an interior cavity, the housing (100) having a first wall (121), the first wall (121) being provided with a frangible portion (400); the barrier (130) is located in the interior of the housing (100), and the periphery of the frangible portion (400) is at least partially provided with the barrier (130). In the battery cell (10) of the application, the separator (130) shields at least part of the weak part (400) from the side surface of the inner part of the shell (100), thereby preventing the electrolyte from continuing to flow from the direction of the separator (130) to the direction close to the weak part (400), reducing the contact between the electrolyte and the weak part (400) and playing a better protection role on the weak part (400).

Description

Battery monomer, battery and power consumption device

Technical Field

The application relates to the field of batteries, in particular to a battery monomer, a battery and an electricity utilization device.

Background

With the increasing importance of environmental protection, electric vehicles are rapidly growing in the vehicle industry due to the energy-saving and environmental protection advantages. The electric vehicle adopts a battery as power supply equipment, an explosion-proof structure is arranged in the battery, and in some cases, electrolyte flows to the surface of the explosion-proof structure to wash the explosion-proof structure, so that the service life of the explosion-proof structure is reduced.

Disclosure of Invention

In view of the above problems, the present utility model provides a battery cell, a battery and an electric device, which can solve the problem that the service life of an explosion-proof structure is reduced due to flushing of an electrolyte to a certain extent.

In a first aspect, the present utility model provides a battery cell comprising:

a housing having an interior cavity, the housing having a first wall, the first wall being provided with a frangible portion;

and the baffle piece is positioned in the inner cavity of the shell, and at least part of the periphery of the weak part is provided with the baffle piece.

In the technical scheme of the embodiment of the utility model, the weak part is used for pressure relief, and when the temperature or the pressure of the inner cavity of the shell reaches a threshold value, the weak part is damaged, so that the pressure relief of the battery cell is realized. The baffle piece is arranged in the shell and arranged in the peripheral area of the weak part, so that electrolyte flowing to the weak part from one side of the baffle piece away from the weak part along the direction parallel to the first wall is blocked by the baffle piece, and the arrangement of the baffle piece can reduce the impact of the electrolyte on at least part of the weak part, thereby improving the protection effect on the weak part and reducing or even solving the problem that the weak part is damaged due to the flushing of the electrolyte to a certain extent.

In some embodiments, the barrier is a closed loop structure.

In this arrangement, the barrier member shields the entire periphery of the weak portion for a full circumference, so that the barrier effect against the electrolyte flowing from the direction parallel to the first wall toward the weak portion is better, and the protection effect against the weak portion is better.

In some embodiments, the battery cell includes an explosion-proof structure, the weak portion is disposed in the explosion-proof structure, the first wall has a mounting hole, the explosion-proof structure is mounted in the mounting hole, and the barrier is disposed at an edge of the mounting hole.

In the setting mode, the explosion-proof structure and the shell are of split structures, and the explosion-proof structure and the shell are manufactured respectively, so that the production and manufacturing difficulty is reduced.

In some embodiments, the mounting hole comprises a first hole section and a second hole section, the first hole section is communicated with one side of the inner cavity of the shell of the second hole Duan Kaojin, the aperture of the first hole section is smaller than that of the second hole section, the explosion-proof structure is mounted on the second hole section, and the baffle is arranged on the edge of the first hole section.

In this kind of setting scheme, the aperture of first hole section is different with the aperture of second hole section for form first installation face between first hole section and the second hole section, this first installation face is convenient for install explosion-proof structure.

In some embodiments, the explosion-proof structure includes a valve plate and a protective plate, the mounting hole further includes a third hole section, the third hole section is communicated with one side of the second Kong Duanyuan from the inner cavity of the housing, the aperture of the third hole section is larger than that of the second hole section, the valve plate is mounted on the second hole section, and the protective plate is mounted on the third hole section.

In this arrangement, the apertures of the third hole section and the second hole section are different, so that a second mounting surface is formed between the third hole section and the second hole section, and the second mounting surface facilitates mounting of the protection sheet.

In some embodiments, the mounting hole further comprises a fourth hole section located between the second hole section and the third hole section, the fourth hole section having a larger pore size than the second hole section and a smaller pore size than the third hole section.

In this kind of setting scheme, be provided with the fourth hole section between third hole section and the second hole section, the setting of fourth hole section makes and has certain clearance between third hole section and the second hole section to make the valve block of installation in the second hole section, after the protection piece is installed to the third hole section, have certain clearance between valve block and the protection piece, make the protection piece not influence the structural strength of valve block when playing the guard action to the valve block.

In some embodiments, the barrier has a thickness H1, and 0 < H1 < 0.5mm.

In this arrangement, the barrier has a thickness such that the barrier occupies relatively little inner cavity space while having a barrier function.

In some embodiments, 0.1 mm.ltoreq.H2.ltoreq.0.3 mm.

In this arrangement, the barrier can function as a better barrier to the electrolyte.

In some embodiments, the barrier has an inner wall and an outer wall in a direction parallel to the first wall, the inner wall being disposed proximate to the weakness, the outer wall being disposed opposite the inner wall, a distance between the inner wall and the outer wall being L1, and 0 < L1 < 7.5mm.

In this arrangement, the barrier has a certain structural strength to exert a better barrier effect on the electrolyte.

In some embodiments, 0.5 mm.ltoreq.L1.ltoreq.2.5 mm.

In this arrangement, the barrier member has a relatively stronger structural strength, a relatively higher barrier effect, and relatively less material required for manufacture.

In some embodiments, the barrier is an integrally formed structure with the housing.

In the arrangement mode, the baffle piece and the shell are integrally formed, so that the production and the manufacture are convenient.

In some embodiments, the barrier has an inner wall and an outer wall in a direction parallel to the first wall, the inner wall being disposed proximate to the weakness, the distance between the wall of the second bore section and the inner wall of the barrier being L2 in a direction parallel to the first wall, and

0＜L2＜7.5mm。

in this arrangement, in the region where L2 is within the above-mentioned interval, shielding of the weak portion by the barrier in a direction perpendicular to the first wall can be reduced or even avoided, and the installation of the explosion-proof structure in the second hole section is facilitated.

In some embodiments, 1 mm.ltoreq.L2.ltoreq.4 mm.

In some embodiments, the barrier has an inner wall disposed proximate to the weakness and an outer wall disposed opposite the inner wall in a direction parallel to the first wall; the distance between the hole wall of the second hole section and the outer wall is L3, then,

if the wall of the second hole section is closer to the weak portion than the outer wall, and

0＜L3≤2.5mm；

if the distance between the hole wall of the second hole section and the weak part is equal to the distance between the outer wall and the weak part, or the hole wall of the second hole section is far away from the weak part relative to the outer wall, L3 is more than or equal to 0 and less than 5mm.

In this arrangement, when L3 is within the above-described interval, the production and manufacture of the barrier are facilitated.

In some embodiments, if the wall of the second hole section is closer to the weakness than the outer wall, 0 < L3 ∈1mm;

if the distance between the hole wall of the second hole section and the weak part is equal to the distance between the outer wall and the weak part, or the hole wall of the second hole section is far away from the weak part relative to the outer wall, and L3 is more than or equal to 0 and less than or equal to 2mm.

In some embodiments, the battery cell further includes a cover disposed in the inner cavity, the cover covering at least a portion of the frangible portion along a thickness direction of the first wall.

In this kind of setting mode, the cover body can shelter from the electrolyte of flowing through the thickness direction flow direction of first wall at least partly weak portion, and the baffle can separate from the direction that is on a parallel with first wall by the baffle keep away from weak portion direction flow direction weak portion's electrolyte, and the cover body sets up with the baffle cooperation, and is better to weak portion's protection effect.

In some embodiments, the cover is connected to the barrier and/or the first wall.

In this arrangement, the cover occupies relatively little space within the interior cavity of the housing.

In some embodiments, the cover is connected to a surface of the barrier remote from the first wall.

In this arrangement, a region of connection is provided between the cover and the barrier, so that electrolyte flowing from between the cover and the barrier to the weak portion can be blocked.

In some embodiments, the cover covers all of the weaknesses.

In this arrangement, the covering body can block more electrolyte flowing from the thickness direction of the first wall to the weak portion, and the protective effect on the weak portion is better.

In some embodiments, the weak portion encloses a pressure relief area, and the cover covers at least a portion of the pressure relief area.

In this kind of setting, the shielding scope of covering is bigger relatively, and is better to the protection effect of weak portion.

In some embodiments, the cover comprises a base portion and a connecting portion, the base portion being connected to the barrier and/or the first wall by the connecting portion.

In this arrangement, the connecting portion is used to secure the base portion to the barrier and/or the first wall so as to provide shielding of the frangible portion by the base portion.

In some embodiments, the first wall has a groove, the weak portion is disposed on an inner wall of the groove, and a gas passage is disposed between the cover and the housing, and the gas passage communicates with the groove.

In this arrangement, the gas passage is configured to facilitate communication between the cavity in the recess and the interior cavity of the housing, thereby facilitating helium testing.

In some embodiments, the first wall has a groove, the weakened portion is provided on an inner wall of the groove, and the cover and/or the housing is provided with a gas passage, which communicates with the groove.

In some embodiments, the gas channel includes a first channel, and the cover includes a base portion and a plurality of connection portions disposed on the base portion at intervals, the first channel being formed between adjacent connection portions.

In this arrangement, the first channel is provided on the cover body, the first channel being formed by the adjacent connection portions in the cover body being enclosed.

In some embodiments, the gas channel includes a second channel extending through the cover in a thickness direction of the cover, a projection of the second channel on the first wall being located outside the weakened portion.

In this arrangement, the second channel is provided on the cover and is formed by ventilation holes penetrating the cover.

In some embodiments, the housing houses a cell assembly, and the first wall is located below the cell assembly.

In this arrangement, the weaknesses are located below the cell assembly and the barrier is arranged at least partially around the periphery of the weaknesses in a direction parallel to the first wall, thereby preventing electrolyte from contacting at least part of the weaknesses.

In some embodiments, the housing includes a shell and an end cap plate that covers the opening of the shell, the first wall being disposed on the end cap plate.

In some embodiments, the housing includes a shell and an end cap plate that covers an opening of the shell, and the first wall is disposed on the shell.

In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment.

The battery comprises the battery cells, so that the battery at least comprises all the beneficial effects of the battery cells, and the detailed description is omitted.

In a third aspect, the present application provides an electrical device comprising a battery as in the above embodiments for providing electrical energy.

The power utilization device comprises the battery, so that the power utilization device has at least all the beneficial effects of the battery and is not repeated herein.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

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 diagram showing an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 2 is a schematic illustration showing the assembly of a housing and an explosion-proof structure in a battery cell according to some embodiments of the present application;

FIG. 3 is a cross-sectional view at A-A in FIG. 2;

FIG. 4 is a partial enlarged view at B in FIG. 3;

FIG. 5 is a schematic illustration of a first distribution of baffles on a first wall according to some embodiments of the present application;

FIG. 6 is a second schematic view of a spacer distribution on a first wall according to some embodiments of the present application;

FIG. 7 is a schematic view of a housing according to some embodiments of the application;

FIG. 8 is a cross-sectional view taken at C-C of FIG. 7;

FIG. 9 is a partial enlarged view at D in FIG. 8;

FIG. 10 is a partial cross-sectional view of a housing in accordance with some embodiments of the application;

FIG. 11 is a partial cross-sectional view of a second embodiment of a housing according to the present application;

fig. 12 is a schematic diagram showing an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 13 is a second schematic structural view of a housing according to some embodiments of the present application;

FIG. 14 is a cross-sectional view taken at E-E of FIG. 13;

fig. 15 is a partial enlarged view of F in fig. 14;

FIG. 16 is a schematic view showing a relative positional relationship between a base material portion and a connecting portion in a cover according to some embodiments of the present application;

FIG. 17 is a schematic view of an exploded view of a cover according to some embodiments of the present application;

FIG. 18 is a schematic diagram showing an exploded view of a cover according to some embodiments of the present application;

FIG. 19 is a partial cross-sectional view III of a housing in some embodiments of the application;

FIG. 20 is a schematic view showing a relative positional relationship between a baffle member and a cover member on a first wall according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

10. A battery cell; 100. a housing; 110. an end cap assembly; 111. an end cover plate; 112. a pole; 120. a housing; 121. a first wall; 122. a mounting hole; 1221. a first bore section; 1222. a second bore section; 1223. a third bore section; 1224. a fourth bore section; 130. a barrier; 131. an inner wall; 132. an outer wall; 133. a top wall; 200. a cell assembly; 210. a cell body; 220. a tab; 300. a cover; 310. a base material portion; 320. a connection part; 400. a weak portion; 410. a valve plate; 420. a protective sheet; 500. a transfer sheet; 600. a gas channel; 610. a first channel; 620. a second channel; 630. and a third channel.

Detailed Description

Embodiments of the technical scheme 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 aspects of the present application, and thus are merely examples, and are not intended to limit the scope 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 of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

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 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 describing embodiments of the present application, the term "plurality" refers to more than two (including two).

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should 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 specific circumstances.

Along with the serious environmental pollution, the environmental protection consciousness of people is gradually enhanced, and the new energy industry is rapidly raised at the moment, so that a wide space is provided for the application and development of the lithium ion battery. The lithium ion battery has the characteristics of higher energy density, longer cycle life, good charge-discharge multiplying power performance and the like, is widely applied, more and more electric equipment such as mobile phones, notebook computers, electric tools, electric automobiles and the like select the lithium ion battery as a power supply, and people generally refer to the lithium ion battery used in the electric equipment as a power battery. The power battery generally includes a battery cell including a housing and a cell assembly, the cell assembly being mounted within the housing, the housing being mounted with an explosion-proof structure (e.g., an explosion-proof structure) for venting the battery when a temperature or pressure within the housing exceeds a threshold. The inventor notes that when the explosion-proof structure is located below the battery cell assembly, after vibration and other conditions occur, free electrolyte in the shell flows in the shell so as to wash the explosion-proof structure, on one hand, the electrolyte has a certain corrosion effect on the explosion-proof structure, on the other hand, during the use process of the battery, the electrolyte flows in the shell to have a certain impact on the explosion-proof structure, and both the above factors can reduce the service life of the explosion-proof structure.

Based on the above-mentioned considerations, in order to solve the problem that the electrolyte has an adverse effect on the explosion-proof structure, the inventors have conducted intensive studies and have devised a battery cell in which a barrier member is provided in at least a partial region of the inner side of the casing located in the peripheral region of the explosion-proof structure, and the barrier member plays a certain role in blocking the electrolyte flowing to the explosion-proof structure from a direction parallel to the wall plate of the casing for mounting the explosion-proof structure, thereby protecting the explosion-proof structure to a certain extent and reducing the adverse effect of the electrolyte on the explosion-proof structure.

The battery cell disclosed by the embodiment of the application can be used for an electric device using a battery as a power supply or various energy storage systems using the battery as an energy storage element.

In the embodiment of the application, the length direction, the width direction and the thickness direction refer to the length direction, the width direction and the height direction of the battery cell, and the battery cell is the smallest unit constituting the battery.

As shown in fig. 1 to 4, in a first aspect of the embodiment of the present application, there is provided a battery cell 10, the battery cell 10 including a housing 100 and a barrier 130. The housing 100 has an inner cavity, the housing 100 has a first wall 121, the first wall 121 is provided with a frangible portion 400; the barrier 130 is disposed in the inner cavity, and the barrier 130 is disposed at least partially around the weakened portion 400.

The housing 100 is a structure for forming an inner cavity for accommodating other components of the battery cell 10. The first wall 121 is any wall of the housing 100, which may be a top wall, a bottom wall, or a side wall.

The first wall 121 is provided with a weak portion 400, and the weak portion 400 is used for breaking to realize pressure release of the battery cell 10 when the temperature or pressure of the battery cell 10 exceeds a threshold value. The weak portion 400 may be a score line, a thinned portion, or an explosion proof structural piece mounted to the housing 100. The thinned portion is a region having a thickness smaller than that of other regions of the first wall 121.

The barrier 130 is used for enclosing at least a partial area of the periphery of the weak portion 400, and since the barrier 130 is located in the inner cavity of the housing 100, the electrolyte flowing from the side of the barrier 130 away from the weak portion 400 along the direction (X direction) parallel to the first wall 121 toward the weak portion 400 is blocked by the barrier 130, so that the barrier 130 can reduce the impact of the electrolyte on at least a part of the weak portion 400, thereby improving the protection effect on the weak portion 400, and reducing or even solving the problem of breakage of the weak portion 400 due to the flushing of the electrolyte to some extent.

In some alternative embodiments, the battery cell 10 further includes a cell assembly 200, the housing 100 includes an end cap assembly 110 and a housing 120, the end cap assembly 110 includes an end cap plate 111, and the end cap plate 111 refers to a component that is capped at an opening of the housing 120 to isolate the interior cavity of the battery cell 10 from the external environment. The end cap assembly 110 further includes a post 112, the post 112 being adapted to be electrically connected to the cell assembly 200 for outputting or inputting electrical energy from the battery cell 10. The electrode post 112 includes a positive electrode post and a negative electrode post, which are disposed on the end cover 111 at intervals in the longitudinal direction of the cell unit.

The cell assembly 200 is a component of the battery cell 10 where electrochemical reaction occurs, and the housing 100 may contain one or more cell assemblies 200 therein, the cell assemblies 200 being formed mainly by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is typically provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the cell body 210 of the cell assembly 200, and the portions of the positive and negative electrode sheets having no active material constitute the tabs 220, respectively. During charge and discharge of the battery, the positive and negative electrode active materials react with the electrolyte, and the tab 220 is electrically connected with the post 112 to form a current loop. The tab 220 includes a positive tab for connection with the positive post and a negative tab for connection with the negative post.

The battery cell 10 further includes a switching piece 500, wherein the positive tab and the positive post are connected through one switching piece 500, and the negative tab and the negative post are connected through another switching piece 500.

In the case 100, the weak portion 400 may be provided on the end cover plate 111, may be provided on the case 120, and may be provided on a wall plate opposite to the end cover plate 111 in the case 120, or may be provided on other side walls of the case 120.

In some embodiments, the frangible portion 400 includes a score, which may be linear or curvilinear. Such a weak portion 400 is torn apart by the score when the internal temperature or pressure of the battery cell 10 exceeds a threshold value, thereby achieving pressure relief.

The number of the barrier members 130 provided at the first wall 121 may be one or more, and the barrier members 130 may have a rectangular, circular, arc-shaped, ring-shaped, etc. shape in a cross section parallel to the first wall 121.

Illustratively, as shown in fig. 5, in one possible arrangement, the first wall 121 is provided with a plurality of barriers 130, the plurality of barriers 130 being spaced apart at the periphery of the weak portion 400, the plurality of barriers 130 being capable of blocking electrolyte flowing toward the weak portion 400 in a plurality of directions at the periphery of the weak portion 400.

In one possible arrangement, as shown in fig. 6, the first wall 121 is provided with a baffle 130, and the baffle 130 is ring-shaped with a notch, for example, the baffle 130 may have a C-shaped or U-shaped structure. Such a barrier 130 has a larger shielding area for at least one side of the periphery of the weak portion 400 and has a better barrier effect for the electrolyte flowing to the weak portion 400 from the side.

In some embodiments, as shown in fig. 7 to 9, the barrier 130 is a closed ring structure, and the barrier 130 may be a closed ring structure such as a circular ring, a polygonal ring, a kidney-shaped ring, an elliptical ring, a profiled ring, or the like. In this arrangement, the barrier 130 is disposed along the outside of the weak portion 400 entirely around to enclose the weak portion 400 therebetween, so that the barrier 130 can block the electrolyte flowing toward the weak portion 400 in any one direction (X direction) parallel to the first wall 121 to further reduce the impact of the electrolyte on the weak portion 400, thereby further improving the protection effect on the weak portion 400.

As shown in fig. 9, in some embodiments, the battery cell 10 includes an explosion-proof structure, the weak portion 400 is provided at the explosion-proof structure, the first wall 121 has the mounting hole 122, the explosion-proof structure is mounted at the mounting hole 122, and the barrier 130 is provided at an edge of the mounting hole 122. In other words, the barrier 130 is provided at least in a partial area of the periphery of the mounting hole 122, and the barrier 130 can block part of the electrolyte flowing toward the mounting hole 122 in the direction (X direction) parallel to the first wall 121, that is, block part of the electrolyte flowing toward the weak portion 400 in the direction of the first wall 121. In this arrangement, the explosion-proof structure and the housing 100 are separate structures, and the explosion-proof structure and the housing 120 are manufactured separately, so that the difficulty in production and manufacturing is reduced.

With continued reference to fig. 9, in some embodiments, the mounting hole 122 includes a first hole section 1221 and a second hole section 1222, the first hole section 1221 is connected to a side of the second hole section 1222 near the inner cavity of the housing 100, the first hole section 1221 has a smaller hole diameter than the second hole section 1222, the explosion-proof structure is mounted to the second hole section 1222, and the barrier 130 is disposed at an edge of the first hole section 1221.

The mounting holes 122 may be round holes, square holes, rectangular holes, elliptical holes, kidney-shaped holes, etc. When the mounting hole 122 is a circular hole, the aperture of the mounting hole 122 is the diameter of the mounting hole 122. When the mounting hole 122 is a square hole, the aperture of the mounting hole 122 is the side length of the mounting hole 122. When the mounting hole 122 is a rectangular hole, the mounting hole 122 has a long-side-direction aperture and a short-side-direction aperture. When the mounting hole 122 is an elliptical hole or a waist-shaped hole, the mounting hole 122 has a long-axis-direction aperture and a short-axis-direction aperture.

The aperture of the second aperture segment 1222 is larger than the aperture of the first aperture segment 1221, i.e. the orthographic projection of the first aperture segment 1221 onto the first wall 121 is located inside the orthographic projection of the second aperture segment 1222 onto the first wall 121. When the mounting hole 122 is a circular hole, the first hole section 1221 and the second hole section 1222 are both circular holes, and the diameter of the second hole section 1222 is larger than the diameter of the first hole section 1221. When the mounting hole 122 is a square hole, the side length of the second hole section 1222 is greater than the side length of the first hole section 1221. When the mounting hole 122 is a rectangular hole, the aperture in the long side direction of the second hole section 1222 is larger than the aperture in the long side direction of the first hole section 1221, and/or the aperture in the short side direction of the second hole section 1222 is larger than the aperture in the short side direction of the first hole section 1221. When the mounting hole 122 is an elliptical hole or a waist-shaped hole, the aperture of the second hole section 1222 in the long axis direction is larger than the aperture of the first hole section 1221 in the long axis direction, and/or the aperture of the second hole section 1222 in the short axis direction is larger than the aperture of the first hole section 1221 in the short axis direction.

In this arrangement, the apertures of the first hole section 1221 and the second hole section 1222 are different, such that a first mounting surface is formed between the first hole section 1221 and the second hole section 1222, and in the second hole section 1222, a region where the orthographic projection of the second hole section 1222 on the first wall 121 does not coincide with the orthographic projection of the first hole section 1221 on the first wall 121 forms the first mounting surface, and the limitation of the explosion-proof structure in the direction (X direction) parallel to the first wall 121 is realized by the side wall of the second hole section 1222, and the limitation of the explosion-proof structure in the thickness direction (Y direction) of the first wall 121 is realized by the first mounting surface. The arrangement of the first mounting surface facilitates the installation of the explosion-proof structure on the first wall 121, and increases the contact area between the first wall 121 and the explosion-proof structure.

The thickness direction (Y direction) of the first wall 121, that is, the normal direction of the first wall 121, and if the direction (X direction) parallel to the first wall 121 is referred to as a first direction, the thickness direction (Y direction) of the first wall 121 is perpendicular to the first direction.

In some embodiments, the explosion proof structure includes a valve sheet 410 and a protective sheet 420, the mounting hole 122 further includes a third hole section 1223, the third hole section 1223 communicates with a side of the second hole section 1222 remote from the inner cavity of the housing 100, the aperture of the third hole section 1223 is larger than the aperture of the second hole section 1222, the valve sheet 410 is mounted to the second hole section 1222, and the protective sheet 420 is mounted to the third hole section 1223. The weak portion 400 is disposed on the valve plate 410, and the protecting sheet 420 is used for shielding the valve plate 410 from the side of the valve plate 410 away from the casing 100, so as to protect the valve plate 410, and the protecting sheet 420 can reduce or even avoid the electrolyte outside the casing 100 from contacting the valve plate 410.

In this arrangement, the apertures of the second hole section 1222 and the third hole section 1223 are different, such that a second mounting surface is formed between the second hole section 1222 and the third hole section 1223, in the third hole section 1223, a region where the orthographic projection of the third hole section 1223 on the first wall 121 does not coincide with the orthographic projection of the second hole section 1222 on the first wall 121 forms the second mounting surface, and the limitation of the explosion-proof structure in the direction (X direction) parallel to the first wall 121 is realized by the side wall of the third hole section 1223, and the limitation of the explosion-proof structure in the thickness direction (Y direction) of the first wall 121 is realized by the second mounting surface. The provision of the second mounting surface facilitates mounting of the explosion-proof structure on the first wall 121, increasing the contact area of the first wall 121 with the explosion-proof structure. The edge region of the protection sheet 420 may be provided with an adhesive body, and the protection sheet 420 is attached to the second mounting surface through the adhesive body.

In some embodiments, the mounting hole 122 further includes a fourth hole section 1224, the fourth hole section 1224 being located between the second hole section 1222 and the third hole section 1223, the fourth hole section 1224 having a larger aperture than the second hole section 1222 and the fourth hole section 1224 having a smaller aperture than the third hole section 1223. In this arrangement, a fourth hole section 1224 is disposed between the third hole section 1223 and the second hole section 1222, and the fourth hole section 1224 is disposed such that a certain gap is formed between the third hole section 1223 and the second hole section 1222, so that the valve plate 410 is installed in the second hole section 1222, and after the protective plate 420 is installed in the third hole section 1223, a certain gap is formed between the valve plate 410 and the protective plate 420, so that the protective plate 420 protects the valve plate 410 without affecting the structural strength of the valve plate 410.

As shown in FIG. 9, in some embodiments, the thickness of the barrier 130 is H1, then 0 < H1 < 0.5mm. The thickness of the barrier 130 is the dimension of the barrier 130 in the thickness direction (Y direction) of the first wall 121. The barrier 130 may be of uniform thickness, i.e., the thickness of the barrier 130 is equal throughout. The barrier 130 may also be of non-uniform thickness, i.e., the thickness of different regions of the barrier 130 is not exactly equal. Each region of the barrier 130 has a thickness H1 that satisfies 0 < H1 < 0.5mm, e.g., H1 may be 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, 0.45mm, 0.48mm, etc. When H1 is 0, the barrier 130 is flush with the first wall 121, so that the barrier 130 has no barrier effect on the weak portion 400, and when H1 is greater than or equal to 0.5mm, the barrier 130 occupies relatively more inner cavity space, thereby reducing the occupied space of other structures within the housing 100. When 0 < H1 < 0.5mm, the barrier 130 has a thickness capable of being blocked by the barrier 130 with respect to the electrolyte flowing from the side of the barrier 130 away from the weak portion 400 toward the weak portion 400 in the direction parallel to the first wall 121, and within such a thickness range, the barrier 130 occupies relatively less inner cavity space.

In some embodiments, 0.1 mm.ltoreq.H1.ltoreq.0.3 mm, e.g., H1 may be 0.1mm, 0.13mm, 0.16mm, 0.19mm, 0.21mm, 0.24mm, 0.27mm, 0.3mm, etc.

In this arrangement, the barrier 130 can function as a better barrier to the electrolyte.

As shown in fig. 7, in some embodiments, the barrier 130 has an inner wall 131 and an outer wall 132 along a direction (X direction) parallel to the first wall 121, the inner wall 131 being disposed adjacent to the weak portion 400, the outer wall 132 being disposed opposite the inner wall 131, the distance between the inner wall 131 and the outer wall 132 being L1, 0 < L1 < 7.5mm. For example, L1 may be 0.3mm, 0.55mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 3mm, 3.5mm, 3.8mm, 4.1mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.8mm, 7mm, 7.4mm, or the like. When the baffle 130 is in a ring structure, the baffle 130 has an inner ring surface and an outer ring surface, the circumference of the inner ring surface is smaller than the circumference of the outer ring surface, the inner ring surface is the inner wall 131, and the outer ring surface is the outer wall 132. When the barrier 130 is of a non-annular structure, for example, the barrier 130 is of a square structure, in a direction (X direction) parallel to the first wall 121, a side wall of the barrier 130 closest to the weak portion 400 is an inner wall 131, and a side wall of the barrier 130 opposite to the inner wall 131 is an outer wall 132. The distance L1 between the inner wall 131 and the outer wall 132 of the barrier 130 in the direction parallel to the first wall 121 (X direction) is referred to as a wall thickness, and since the barrier 130 necessarily has a certain wall thickness, L1 cannot be equal to or smaller than 0. When L1 is greater than or equal to 7.5mm, the barrier 130 occupies a relatively large amount of the inner cavity space and more material is required to make the barrier 130. When 0 < L1 < 7.5mm, the barrier 130 has a certain structural strength to exert a better barrier effect against the electrolyte.

In some embodiments, 0.5 mm.ltoreq.L1.ltoreq.2.5 mm. For example, L1 may be 0.5mm, 0.8mm, 1.2mm, 1.6mm, 1.9mm, 2.1mm, 2.3mm, 2.5mm, or the like. When L1 is greater than or equal to 0.5mm, the barrier 130 may have sufficient structural strength, so that the barrier effect on the electrolyte is stronger and deformation is less likely to occur. When L1 is less than or equal to 2.5mm, relatively less material is required to manufacture the barrier 130, and manufacturing of the barrier 130 is easy to achieve.

In some embodiments, the barrier 130 and the housing 100 may be separate structures, and the barrier 130 is mounted on the housing 100 after the barrier 130 and the housing 100 are manufactured separately. The barrier 130 may be made of the same material as the housing 100 or may be made of a different material. The barrier 130 and the housing 100 may be connected by bonding, welding, or the like.

In some embodiments, the barrier 130 is an integral structure with the housing 100. The barrier 130 is integrally formed with the housing 100 for ease of manufacturing. In one possible embodiment, the barrier 130 may be formed from the remainder of the housing 100 created when the mounting hole 122 is punched. For example, a mold is provided in the housing 100, the mold includes a cavity for forming the stopper 130, when the mounting hole 122 is punched in the first wall 121 of the housing 100, the molding is performed from the outside of the first wall 121, the molding is performed such that the excess material generated by the punching moves in the direction of the cavity, the stopper 130 is formed in the cavity of the housing 100 and on the first wall 121 by the mold, the stopper 130 is located in the peripheral area of the mounting hole 122 on the first wall 121, and the stopper 130 and the housing 100 are integrally formed.

When the spacer 130 is formed of the remainder when the first wall 121 is punched with the mounting hole 122, when L1 is equal to or greater than 7.5mm, there may be a case where more material is required to form the spacer 130 and the remainder is insufficient, so 0 < L1 < 7.5mm.

As shown in fig. 9, in some embodiments, the barrier 130 has an inner wall 131 and an outer wall 132 along a direction (X direction) parallel to the first wall 121, the inner wall 131 being disposed adjacent to the weak portion 400, and a distance L2 between the wall of the second hole 1222 and the inner wall 131 of the barrier 130 along the direction (X direction) parallel to the first wall 121 is 0 < L2 < 7.5mm. For example, L2 may be 0.1mm, 0.2mm, 0.43mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 6mm, 6.5mm, 7mm, 7.4mm, or the like.

In one arrangement, the distance between the inner wall 131 of the barrier 130 and the frangible portion 400 is greater than the distance between the wall of the second hole section 1222 and the frangible portion 400 in a direction parallel to the first wall 121 (X-direction). Since the inner wall 131 of the barrier 130 is the closest side wall to the weak portion 400 in the barrier 130, when L2 is 7.5mm or more, the distance between the barrier 130 and the weak portion 400 is far, and if the barrier 130 is of a sealed annular structure, the space occupied by the barrier 130 is relatively large, and the barrier 130 requires relatively much manufacturing material. If the barrier 130 is of a non-sealing annular structure, the further the distance between the barrier 130 and the weak portion 400 is, the weaker the protection effect on the weak portion 400 is.

In another arrangement, the distance between the inner wall 131 of the barrier 130 and the weak portion 400 is smaller than the distance between the wall of the second hole section 1222 and the weak portion 400 in a direction parallel to the first wall 121 (X-direction). If the second hole section 1222 is set to a size suitable for the installation of the explosion-proof structure, and the hole wall of the second hole section 1222 is used as a reference, when the distance between the inner wall 131 of the barrier 130 and the hole wall of the second hole section 1222 is large, a partial area of the barrier 130 may be blocked at one side of the first hole section 1221 facing away from the second hole section 1222, and the exhaust area is affected after the explosion-proof structure is opened. When the barrier 130 is disposed to an area where the first hole section 1221 is not shielded, and when the distance between the inner wall 131 of the barrier 130 and the wall of the second hole section 1222 is large based on the inner wall 131 of the barrier 130, the hole diameter of the second hole section 1222 is relatively large, excessive surplus materials are generated during the punching process, the surplus materials remain redundant after the formation of the barrier 130, and the surplus materials have an adverse effect on the formation of the housing 100.

In some embodiments, 1 mm.ltoreq.L2.ltoreq.4 mm. For example, L2 may be 1mm, 1.1mm, 2mm, 2.6mm, 3mm, 3.5mm, 3.8mm, 3.9mm, 4mm, or the like.

In one possible embodiment, the distance between the wall of the first bore section 1221 and the inner wall 131 of the barrier 130 is 0 in a direction parallel to the first wall 121 (X-direction). Alternatively, the first hole section 1221 has the same cross-sectional shape as the inner wall 131 of the stopper 130 in a direction parallel to the first wall 121 (X-direction), and is uniform in size. So configured, the barrier 130 is unobstructed from the first bore section 1221 and facilitates forming the first bore section 1221 and the barrier 130 during the stamping process.

As shown in fig. 9 to 11, in some embodiments, the barrier 130 has an inner wall 131 and an outer wall 132 in a direction (X direction) parallel to the first wall 121, the inner wall 131 being disposed adjacent to the weakened portion 400, the outer wall 132 being disposed opposite the inner wall 131; the distance between the wall of the second hole 1222 and the outer wall 132 is L3.

If the wall of the second hole section 1222 is closer to the weak portion 400 (shown in fig. 9) than the outer wall 132, 0 < l3.ltoreq.2.5 mm. For example, L3 may be 0.1mm, 0.4mm, 0.5mm, 1mm, 1.6mm, 2.3mm, 2.5mm, or the like. When the position of the inner wall 131 of the barrier 130 is unchanged, the larger L3 is, the smaller the aperture diameter of the second hole section 1222 is, or the larger the wall thickness of the barrier 130 is, both of which are disadvantageous for the formation of the barrier 130. When the stopper 130 is formed of the surplus material generated by punching the mounting hole 122, if the aperture of the second hole section 1222 is small or the wall thickness of the stopper 130 is large, a case may occur in which the surplus material is insufficient to manufacture the stopper 130, and thus the distance between the aperture of the second hole section 1222 and the outer wall 132 of the stopper 130 needs to be controlled so that the surplus material generated by punching the mounting hole 122 is sufficient to form the stopper 130.

If the distance between the wall of the second hole section 1222 and the weak portion 400 is equal to the distance between the outer wall 132 and the weak portion 400 (as shown in fig. 10), or if the wall of the second hole section 1222 is farther from the weak portion 400 than the outer wall 132 (as shown in fig. 11), 0.ltoreq.l3 < 5mm. For example, L3 may be 0mm, 0.5mm, 0.8mm, 1.2mm, 1.6mm, 1.8mm, 2.2mm, 2.6mm, 3mm, 3.5mm, 4.3mm, 4.7mm, 4.9mm, 5mm, or the like. When the distance between the wall of the second hole section 1222 and the weak portion 400 is equal to the distance between the outer wall 132 and the weak portion 400, L3 is 0. When the hole wall of the second hole section 1222 is farther from the weak portion 400 than the outer wall 132, the larger L3 is when the position of the inner wall 131 of the barrier 130 is unchanged, the larger the hole diameter of the second hole section 1222 is, or the smaller the wall thickness of the barrier 130 is, both of which are disadvantageous for the production and manufacture of the housing 100. If the hole diameter of the second hole section 1222 is too large or the wall thickness of the spacer 130 is small when the spacer 130 is formed by the remainder produced by punching the mounting hole 122, the remainder produced after punching the mounting hole 122 still has more redundancy after manufacturing the spacer 130, and the redundant remainder has an adverse effect on the forming of the housing 100. Therefore, when the hole wall of the second hole section 1222 is more distant from the weak portion 400 than the outer wall 132, 0.ltoreq.l3 < 5mm, and L3 is within the above-mentioned interval, the surplus material generated by punching the mounting hole 122 can be more reasonably utilized, and the adverse effect of the surplus material on the molding of the housing 100 is reduced while the surplus material is reused.

In some embodiments, 0 < L3.ltoreq.1 mm if the wall of the second hole section 1222 is closer to the weakpoint 400 than the outer wall 132. For example, L3 may be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or the like.

If the distance between the wall of the second hole section 1222 and the weak portion 400 is equal to the distance between the outer wall 132 and the weak portion 400, or if the wall of the second hole section 1222 is farther from the weak portion 400 than the outer wall 132, 0.ltoreq.l3.ltoreq.2mm. For example, L3 may be 0mm, 0.4mm, 0.6mm, 0.8mm, 1.2mm, 1.3mm, 1.5mm, 1.7mm, 2mm, or the like. The L3 is more than or equal to 0 and less than or equal to 2mm, the excess material generated by punching the mounting holes 122 can be more reasonably utilized, and the adverse effect of the excess material on the molding of the shell 100 is reduced while the excess material is reused.

As shown in fig. 12 to 15, in some embodiments, the battery cell 10 further includes a cover 300, the cover 300 is disposed in the inner cavity, and the cover 300 covers at least part of the weak portion 400 along the thickness direction (Y direction) of the first wall 121.

In this arrangement, the covering body 300 can block the electrolyte flowing from the thickness direction (Y direction) of the first wall 121 to at least part of the weak portion 400, and the barrier 130 can block the electrolyte flowing from the direction (X direction) parallel to the first wall 121 from the direction away from the weak portion 400 to the weak portion 400 by the barrier 130, and the covering body 300 is disposed in cooperation with the barrier 130, so that the protection effect for the weak portion 400 is better.

The cover 300 is used for covering at least part of the weak portion 400, and since the cover 300 is mounted in the inner cavity, the cover 300 covers the inner side of the weak portion 400, that is, the part of the weak portion 400 covered by the cover 300 is separated from the electrolyte, so that the electrolyte can be prevented from directly contacting with the weak portion 400 covered by the cover 300, and the weak portion 400 can be protected to a certain extent.

The cover 300 may be made of an insulating material, for example, the cover 300 may include a portion made of a PET (polyethylene terephthalate) material.

In some embodiments, cover 300 is coupled to barrier 130 and/or first wall 121. That is, the cover 300 may be connected only with the first wall 121, or the cover 300 may be connected only with the barrier 130, or the cover 300 may be connected with both the barrier 130 and the first wall 121. In this arrangement, the distance between the cover 300 and the frangible portion 400 is closer and the cover 300 occupies relatively less space within the interior cavity of the housing 100.

In some embodiments, cover 300 is coupled to a surface of barrier 130 remote from first wall 121. In this arrangement, there is a region of connection between the cover 300 and the barrier 130 so that electrolyte flowing from between the cover 300 and the barrier 130 to the frangible portion 400 can be blocked.

When the barrier 130 is of an annular structure, the cover 300 is connected to the surface of the barrier 130 remote from the first wall 121 such that the cover 300 covers at least a partial region of the opening of the chamber defined by the barrier 130, to reduce or even prevent the electrolyte from flowing toward the weak portion 400 in the thickness direction (Y direction) of the first wall 121 via the opening of the chamber defined by the barrier 130 to some extent.

In some embodiments, the cover 300 covers all of the weaknesses 400. In this arrangement, the cover 300 can block more electrolyte flowing from the thickness direction (Y direction) of the first wall 121 to the weak portion 400, and the protective effect of the weak portion 400 is better.

When the barrier 130 is of a ring-shaped structure, the cover 300 is connected to the surface of the barrier 130 remote from the first wall 121 such that the cover 300 completely covers the opening of the chamber defined by the barrier 130, so as to reduce or even prevent the electrolyte from flowing to the weak portion 400 in the thickness direction (Y direction) of the first wall 121 via the opening of the chamber defined by the barrier 130 to some extent.

In some embodiments, the frangible portion 400 defines a relief zone, and the cover 300 covers at least a portion of the relief zone. Specifically, the weak portion 400 is annular, and the enclosed area thereof forms a pressure relief area. The frangible portion 400 can be a closed loop, such as a circular loop, a rectangular loop, etc., that fully encloses the pressure relief zone. When the internal temperature or pressure of the battery cell 10 exceeds a threshold, part or all of the weak portion 400 tears, thereby causing the pressure relief region to flip up with respect to other regions of the first wall 121 or the pressure relief region to separate from the first wall 121 to more rapidly effect pressure relief. Alternatively, the weak portion 400 may have an open ring shape, such as a C-shaped ring structure, partially surrounding the periphery of the pressure release region, and when the internal temperature or pressure of the battery cell 10 exceeds a threshold value, part or all of the weak portion 400 is torn, so that the pressure release region is turned up with respect to other regions of the first wall 121 to more rapidly achieve pressure release. In this arrangement, the shielding range of the cover 300 is relatively larger, and the protection effect for the weak portion 400 is better.

When the weak portion 400 encloses the pressure relief area, the barrier 130 is disposed not only in the outer area of the weak portion 400 but also in the outer area of the pressure relief area.

In some embodiments, the cover 300 conceals the partial weakness 400 and the cover 300 protects the partial weakness 400 that it conceals.

In some embodiments, the cover 300 conceals all of the weaknesses 400, and the cover 300 provides better protection for the weaknesses 400.

In some embodiments, the covering body 300 covers at least part of the pressure relief area outside the weak portion 400, so that the covering area of the covering body 300 is relatively larger, which is beneficial for better protection of the weak portion 400 by the covering body 300.

Illustratively, in some embodiments, the cover 300 completely covers the frangible portion 400 and the pressure relief zone, thereby better protecting the frangible portion 400.

As shown in fig. 16-18, in some embodiments, the covering body 300 includes a base portion 310 and a connecting portion 320, the base portion 310 being connected to the barrier 130 and/or the first wall 121 by the connecting portion 320.

The base material portion 310 serves to shield the weak portion 400, and the base material portion 310 serves to separate the electrolyte from at least a partial region of the weak portion 400. The base material portion 310 may be made of PET material.

The connecting portion 320 is used to fix the base portion 310 with the barrier 130 and/or the first wall 121. In one embodiment, the connection portion 320 is at least partially surrounded on the weak portion 400, that is, at least a partial region of the connection portion 320 is connected to the barrier 130 and/or the first wall 121 located outside the weak portion 400, so as to fix the base material portion 310 at a region opposite to the weak portion 400 in the thickness direction (Y direction) of the first wall 121, thereby covering and protecting the weak portion 400 with the base material portion 310.

In this arrangement, the connecting portion 320 is used to secure the base portion 310 to the barrier 130 and/or the first wall 121, so as to facilitate shielding of the frangible portion 400 by the base portion 310.

In some embodiments, the first wall 121 has a groove, the weak portion 400 is disposed on an inner wall of the groove, and a gas passage 600 is disposed between the cover 300 and the case 100, and the gas passage 600 communicates with the groove.

In one arrangement, the inner side of the first wall 121 is provided with a groove, the inner wall of which is provided with a score to form the frangible portion 400, the arrangement of the groove being such that the thickness of the region of the first wall 121 where the frangible portion 400 is provided is reduced to facilitate pressure relief through the frangible portion 400.

As shown in fig. 19, in one arrangement, the battery cell 10 includes an explosion-proof structure, the weak portion 400 is disposed in the explosion-proof structure, the first wall 121 is provided with the mounting hole 122, the mounting hole 122 includes a first hole section 1221 and a second hole section 1222, and the explosion-proof structure is mounted in the second hole section 1222, and the explosion-proof structure and the side wall of the first hole section 1221 enclose to form the groove.

When at least a partial region of the cover 300 is covered by the barrier 130, the barrier 130 is located between the weak portion 400 and the cover 300, and thus the gas passage 600 may also be provided on the barrier 130 or formed by the barrier 130. For example, when the number of the spacers 130 is plural, the distance between the first wall 121 and the partial region of the cover 300 may be increased by the spacers 130 disposed at intervals, and the gas passages 600 may be formed by surrounding the adjacent two spacers 130, the cover 300 and the first wall 121. When the number of the barrier members 130 is one and the barrier members 130 are of an annular structure having notches, the notches of the barrier members 130 may form the gas passage 600. When the number of the barrier members 130 is one and the barrier members 130 have a closed ring-shaped structure, a recess may be provided at a side of the barrier members 130 facing the cover 300, and the gas passage 600 may be defined by the recess and the cover 300.

In this arrangement, since the first wall 121 is provided with the groove, after the groove is covered by the cover 300, the cavity formed by the groove is separated from the inner cavity of the housing 100, and if helium is detected, the accuracy of the helium detection result is low because the cavity formed in the groove becomes a sealed cavity. A gas passage 600 is provided between the cover 300 and the housing 100, the gas passage 600 allowing the cavity in the groove to communicate with the inner cavity of the housing 100, thereby facilitating improvement of helium test result accuracy.

In some embodiments, the first wall 121 has a groove, the weak portion 400 is provided at an inner wall of the groove, and the cover 300 and/or the case 100 are provided with a gas passage 600, and the gas passage 600 communicates with the groove. That is, the gas passage 600 may be provided only in the cover 300, the gas passage 600 may be provided only in the housing 100, and the gas passage 600 may be provided in each of the cover 300 and the housing 100. In this arrangement, the cover 300 and/or the housing 100 are manufactured and the gas passage 600 is manufactured, thereby improving the manufacturing efficiency.

As shown in fig. 16, in some embodiments, the gas passage 600 includes a first passage 610, and the cover 300 includes a base material portion 310 and a plurality of connection portions 320 spaced apart on the base material portion 310, with the first passage 610 formed between adjacent connection portions 320. For example, the connection portion 320 is a glue layer, one side of the glue layer is adhered to the substrate portion 310, and the other side is adhered to the first wall 121 and/or the barrier member 130, and a glue-free area is formed between adjacent glue layers, and the glue-free area can be used for allowing gas to pass therethrough, so as to form the first channel 610.

In this arrangement, the first channel 610 is disposed on the cover 300, where the first channel 610 is formed by surrounding adjacent connection portions 320 in the cover 300, and this arrangement of the first channel 610 does not require adding a structure to the cover 300, and does not require adding a manufacturing process, and can form the first channel 610 on the cover 300 only by adjusting the location of the connection portions 320 on the cover 300.

The shape of the first channel 610 is related to the shape of the glue free area, which is related to the shape, number and placement of the connection portions 320. The first channel 610 may be provided with one, two or more openings.

In some embodiments, the number of openings of the first channel 610 is one, the number of the connecting portions 320 is two, the two connecting portions 320 are respectively connected to two sides of the base portion 310, one ends of the two connecting portions 320 are connected, one ends of the two connecting portions 320 are spaced apart, and an opening of the first channel 610 is formed between the ends of the two connecting portions 320 spaced apart. Gas in the cavity of the housing 100 may enter the first channel 610 through the opening and enter the groove through the first channel 610, and gas in the groove may flow to the cavity of the housing 100 through the opening of the first channel 610, thereby enabling communication between the groove and the cavity of the housing 100.

In some embodiments, the first channel 610 has at least two openings for communicating with the interior cavity of the housing 100. The number of openings increases such that the communication of the recess with the interior cavity of the housing 100 increases. And if one of the openings is closed due to external force factors (e.g., impact of electrolyte), the communication between the recess and the inner cavity of the housing 100 can be also achieved through the other opening.

In addition, the two connecting portions 320 disposed on the base portion 310 at intervals can form a first channel 610 with two openings around the base portion 310, and the first channel 610 is manufactured in a simple and convenient manner.

As shown in fig. 15 and 19, in some embodiments, the thickness H2 of the cover 300 is greater than or equal to 0.01mm, and the thickness H2 of the cover 300 is less than or equal to 0.2mm.

The thickness of the cover 300 is the dimension of the cover 300 in the thickness direction of the first wall 121. When the covering body 300 includes the base material portion 310 and the connection portion 320, the connection portion 320 is disposed in a partial area of the base material portion 310 facing the first wall 121, and the thickness of the covering body 300 is the sum of the thickness of the base material portion 310 and the thickness of the connection portion 320 in the area where the connection portion 320 is disposed in the base material portion 310. In the region where the connection portion 320 is not provided in the base material portion 310, the thickness of the cover 300 is the thickness of the base material portion 310.

The thickness of the cover 300 is set to be greater than or equal to 0.01mm so that the cover 300 has sufficient structural strength to separate the electrolyte from the weak portion 400, thereby playing a better protective role for the weak portion 400. Setting the thickness of the covering body 300 to be less than or equal to 0.2mm can enable the covering body 300 to have enough structural strength within the size range, and if the thickness is greater than the size, structural redundancy is caused, and more inner cavity space is occupied.

In some embodiments, the first channel 610 extends through the cover 300 in a direction parallel to the first wall 121 (X-direction).

In this arrangement, the first channel 610 extends in a straight line for ease of manufacture. The rectangular sheet-shaped base material portion 310 and two rectangular sheet-shaped connecting portions 320 are adopted, the two rectangular sheet-shaped connecting portions 320 are arranged on the base material portion 310 at intervals, and a first channel 610 parallel to the first wall 121 is formed between the two connecting portions 320. The rectangular connecting portion 320 is more convenient to mold, if the connecting portion 320 is an adhesive tape, the process of cutting the adhesive tape into a rectangular shape is convenient and efficient, if the connecting portion 320 is an adhesive solution, the rectangular connecting portion 320 can be formed on the base material portion 310 by linearly coating the adhesive on the base material portion 310, and the process is simple to operate.

The first channel 610 is parallel to the first wall 121, for example, the extending direction of the first channel 610 may be parallel to the width direction of the battery cell 10 (as shown in fig. 17). Alternatively, the extending direction of the first channel 610 may be parallel to the length direction of the battery cell 10 (as shown in fig. 16 and 18). Alternatively, the extending direction of the first channel 610 may also be inclined with respect to the length direction of the battery cell 10.

As shown in fig. 16 to 18, in some embodiments, the gas passage 600 includes a second passage 620, the second passage 620 penetrating the cover 300 in the thickness direction of the cover 300, and a projection of the second passage 620 on the first wall 121 being located outside the weak portion 400.

In this arrangement, the second passage 620 is provided in the cover 300 and is formed by ventilation holes penetrating the cover 300. In this arrangement, the second passage 620 is provided in the cover 300 and is formed by ventilation holes penetrating the cover 300. In this arrangement, the second channel 620 is not easily obscured by other structures located inside the housing 100, thereby facilitating the maintenance of the groove in constant communication with the interior cavity of the housing 100.

As shown in FIG. 16, in some embodiments, the aperture of the second channel 620 is R, then 0.1mm R10 mm. In the aperture range of the ventilation hole, the second channel 620 not only can make the cover 300 have a certain structural strength to realize shielding of the weak portion 400, but also can meet the communication requirement between the groove and the inner cavity of the housing 100. When the aperture of the second channel 620 is less than or equal to 10mm, the shielding requirement of the shielding body 300 on the weak portion 400 can be satisfied, and the size of the second channel 620 is insufficient for the electrolyte to enter the groove.

In some embodiments, the barrier 130 is a closed annular structure, a partial region of the cover 300 is connected to a side wall of the barrier 130 away from the first wall 121 (for convenience of reference, the side wall of the barrier 130 away from the first wall 121 is hereinafter referred to as a top wall 133), and a partial region of the cover 300 is connected to the first wall 121, and in a thickness direction (Y direction) of the first wall 121, the cover 300 completely covers the barrier 130, and the cover 300 covers a partial region of the first wall 121. The region of the cover 300 between the connection with the first wall 121 and the connection with the top wall 133 of the barrier 130 may be connected with the outer wall 132 of the barrier 130. Alternatively, the cover 300 is provided with the first channel 610, and the area of the cover 300 between the connection with the first wall 121 and the connection with the top wall 133 of the barrier 130 may form the third channel 630, that is, the cover 300, the first wall 121 and the barrier 130 enclose the third channel 630, and the third channel 630 communicates with the first channel 610 and with the groove through the first channel 610.

When the case 100 has a rectangular parallelepiped structure, the length direction of the weak portion 400 is the same as the length direction of the first wall 121, and the barrier 130 may have a kidney-shaped structure, the length direction of which is the same as the length direction of the first wall 121. The cover 300 may have a square structure, and the length direction of the cover 300 is the same as the length direction of the first wall 121. The size of the cover 300 is greater than the size of the outer wall 132 of the barrier 130 along the length direction of the first wall 121. So configured, the cover 300 is conveniently coupled to the first wall 121. The size of the cover 300 is equal to the size of the outer wall 132 of the barrier 130 in the width direction of the first wall 121 (as shown in fig. 13), or the size of the cover 300 is slightly larger than the size of the outer wall 132 of the barrier 130 (as shown in fig. 20). Since the width of the first wall 121 is relatively small, the size of the cover 300 is equal to the size of the outer wall 132 of the barrier 130, which reduces the space occupied by the cover 300 in the width direction. The size of the cover 300 being slightly larger than the size of the outer wall 132 of the barrier 130 may facilitate a relatively larger contact area between the cover 300 and the top wall 133 of the barrier 130, facilitating an improved connection strength between the cover 300 and the top wall 133 of the barrier 130.

In some embodiments, the housing 100 houses the cell assembly 200 with the first wall 121 positioned below the cell assembly 200.

The first wall 121 is located below the cell assembly 200, and at least includes the following arrangements:

the housing 100 includes an end cap plate 111 and a casing 120, where the end cap plate 111 covers the opening of the casing 120, and the first wall 121 is disposed on the end cap plate 111, that is, when the weak portion 400 is disposed on the end cap plate 111, the battery cell 10 is in the working position, and the end cap plate 111 is located below the battery cell assembly 200 (that is, the battery cell 10 is in an inverted condition after being mounted). In this case, the free electrolyte generated during the use of the battery cell 10 moves downward to the end cap plate 111 by gravity, and since the barrier 130 is provided at least in a partial region of the outer circumference of the weak portion 400, the barrier 130 can block the electrolyte from flowing toward the weak portion 400 in a direction (X direction) parallel to the first wall 121. When the battery cell 10 includes the cover 300, the cover 300 is shielded over the weak portion 400, so that at least part of the weak portion 400 may be shielded to prevent the electrolyte from flowing from top to bottom to the weak portion 400.

Alternatively, the first wall 121 is a side of the housing 120 opposite to the end cover plate 111, and if the side provided with the end cover plate 111 is a top, the first wall 121 is a bottom wall of the housing 120. During use of the battery cell 10, the end cap plate 111 is positioned on top of the battery cell 10 and the first wall 121 is positioned on the bottom of the battery cell 10. In this case, the free electrolyte generated from the battery cell 10 during the injection or use is moved downward to the first wall 121 by gravity, and since the barrier 130 is provided at least in a partial region of the outer circumference of the weak portion 400, the barrier 130 can block the electrolyte from flowing toward the weak portion 400 in a direction (X direction) parallel to the first wall 121. When the battery cell 10 includes the cover 300, the cover 300 is shielded over the weak portion 400, so that at least part of the weak portion 400 may be shielded to prevent the electrolyte from flowing from top to bottom to the weak portion 400.

In addition, the first wall 121 may be provided on other side walls of the housing 120 other than the side opposite to the end cap plate 111.

A second aspect of the embodiment of the present application provides a battery including the battery cell 10 in the above-described embodiment.

The battery comprises a box body and a battery cell 10, wherein the battery cell 10 is accommodated in the box body. The case is used for providing an accommodating space for the battery cell 10, and may have various structures.

In the battery, the number of the battery cells 10 may be plural, and the plural battery cells 10 may be connected in series or parallel or in series-parallel, and the series-parallel refers to that the plural battery cells 10 are connected in series or 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; of course, the battery may be a battery module form formed by connecting a plurality of battery cells 10 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case. The battery may further include other structures, for example, a bus bar 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.

A third aspect of the embodiments of the present application provides an electric device, which includes the battery in the above embodiments, where the battery is used to provide electric energy.

The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. 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 embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The interior of the vehicle is provided with a battery, which may be provided at the bottom or at the head or at the tail of the vehicle. The battery may be used for power supply of the vehicle, for example, the battery may be used as an operating power source of the vehicle. The vehicle may also include a controller and a motor, the controller being configured to control the battery to power the motor, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

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

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 application has been described in detail with reference to the foregoing embodiments, it will 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 application, and are intended to be included within the scope of the appended 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

1. A battery cell, comprising:

and the baffle piece is positioned in the inner cavity, and at least part of the periphery of the weak part is provided with the baffle piece.

2. The battery cell of claim 1, wherein the separator is a closed loop structure.

3. The battery cell of claim 1, wherein the battery cell comprises an explosion-proof structure, the weak portion is disposed in the explosion-proof structure, the first wall has a mounting hole, the explosion-proof structure is mounted in the mounting hole, and the barrier is disposed at an edge of the mounting hole.

4. The battery cell of claim 3, wherein the mounting hole comprises a first hole section and a second hole section, the first hole section is communicated with one side of the inner cavity of the second hole Duan Kaojin, the aperture of the first hole section is smaller than that of the second hole section, the explosion-proof structure is mounted on the second hole section, and the barrier is arranged at the edge of the first hole section.

5. The battery cell of claim 4, wherein the explosion-proof structure comprises a valve plate and a protective plate, the mounting hole further comprises a third hole section, the third hole section is communicated with one side of the inner cavity of the second hole Duan Yuanli, the aperture of the third hole section is larger than that of the second hole section, the valve plate is mounted on the second hole section, and the protective plate is mounted on the third hole section.

6. The battery cell of claim 5, wherein the mounting hole further comprises a fourth hole section located between the second hole section and the third hole section, the fourth hole section having a larger pore size than the second hole section and a smaller pore size than the third hole section.

7. The battery cell of any one of claims 1-6, wherein the separator has a thickness H1 and 0 < H1 < 0.5mm.

8. The battery cell of claim 7,

0.1mm≤H1≤0.3mm。

9. the battery cell of any one of claims 1-6, wherein the barrier has an inner wall and an outer wall in a direction parallel to the first wall, the inner wall being disposed proximate the weakness, the outer wall being disposed opposite the inner wall, a distance between the inner wall and the outer wall being L1, and 0 < L1 < 7.5mm.

10. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells,

0.5mm≤L1≤2.5mm。

11. the battery cell of any one of claims 4-6, wherein the barrier is of unitary construction with the housing.

12. The battery cell of claim 11, wherein the barrier has an inner wall and an outer wall in a direction parallel to the first wall, the inner wall being disposed proximate to the weakness, and wherein a distance between a wall of the second aperture segment and the inner wall of the barrier is L2 in a direction parallel to the first wall, and 0 < L2 < 7.5mm.

13. The battery cell of claim 12, wherein the battery cell comprises a plurality of cells,

1mm≤L2≤4mm。

14. the battery cell of claim 11, wherein the barrier has an inner wall and an outer wall in a direction parallel to the first wall, the inner wall disposed proximate the frangible portion, the outer wall disposed opposite the inner wall; the distance between the hole wall of the second hole section and the outer wall is L3, then,

if the hole wall of the second hole section is closer to the weak part relative to the outer wall, L3 is more than 0 and less than or equal to 2.5mm;

if the distance between the hole wall of the second hole section and the weak part is equal to the distance between the outer wall and the weak part, or the hole wall of the second hole section is far away from the weak part relative to the outer wall, L3 is more than or equal to 0 mm and less than or equal to 5mm.

15. The battery cell of claim 14, wherein 0 < L3 ∈1mm if the wall of the second hole section is closer to the weak portion than the outer wall;

if the distance between the hole wall of the second hole section and the weak portion is equal to the distance between the outer wall and the weak portion, or the hole wall of the second hole section is far away from the weak portion relative to the outer wall, L3 is more than or equal to 0 and less than or equal to 2mm.

16. The battery cell of any one of claims 1-6, further comprising a cover disposed within the interior cavity, the cover covering at least a portion of the frangible portion along a thickness of the first wall.

17. The battery cell of claim 16, wherein the cover is coupled to the barrier and/or the first wall.

18. The battery cell of claim 17, wherein the cover is coupled to a surface of the barrier remote from the first wall.

19. The battery cell of claim 16, wherein the cover covers all of the weaknesses.

20. The battery cell of claim 16, wherein the frangible portion defines a relief area, and wherein the cover covers at least a portion of the relief area.

21. The battery cell of any one of claims 17 to 20, wherein the cover comprises a base portion and a connecting portion, the base portion being connected to the barrier and/or the first wall by the connecting portion.

22. The battery cell of claim 16, wherein the first wall has a groove, the frangible portion is disposed on an inner wall of the groove, a gas passage is disposed between the cover and the housing, and the gas passage communicates with the groove.

23. The battery cell of claim 16, wherein the first wall has a groove, the weak portion is disposed on an inner wall of the groove, and the cover and/or the housing are provided with a gas passage that communicates with the groove.

24. The battery cell of claim 23, wherein the gas channel comprises a first channel, the cover comprising a base portion and a plurality of connecting portions disposed on the base portion at intervals, the first channel being formed between adjacent connecting portions.

25. The battery cell of claim 23 or 24, wherein the gas channel comprises a second channel extending through the cover in a thickness direction of the cover, a projection of the second channel on the first wall being located outside the frangible portion.

26. The battery cell of any one of claims 1-6, wherein the housing houses a cell assembly, the first wall being located below the cell assembly.

27. The battery cell of claim 26, wherein the housing comprises a shell and an end cap plate that covers the opening of the shell, the first wall being disposed on the end cap plate.

28. The battery cell of claim 26, wherein the housing comprises a shell and an end cap plate, the end cap plate covering the opening of the shell, the first wall being disposed on the shell.

29. A battery, comprising: the battery cell of any one of claims 1 to 28.

30. An electrical device comprising a battery as claimed in claim 29, the battery being adapted to provide electrical energy.