CN216055080U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application discloses a battery monomer, a battery and an electric device, wherein the battery monomer comprises a shell, a pole column and an electrode component, and at least one shell wall of the shell is provided with a shell wall hole; the pole is arranged on at least one shell wall and comprises a pole body, the pole body is provided with a pole hole, and the pole hole is communicated with the shell wall hole; an electrode assembly is disposed in the receiving cavity of the housing, the electrode assembly including a body portion and a tab extending from the body portion toward the at least one sidewall, the tab passing through the wall hole and the post hole and electrically connected to the post. This application is through setting up utmost point post hole on utmost point post, and this utmost point post hole link up with the shell wall hole, when the assembly battery is monomer like this, can make utmost point ear directly wear out and be connected with utmost point post electricity from the utmost point post hole of utmost point post, and need not to buckle utmost point ear, just so need not to reserve and roll over utmost point ear space, and then improve the free energy density of battery.

Description

Battery cell, battery and power consumption device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery, and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

The battery cell generally includes a case and an electrode assembly, and how to maximize the space of the case to improve the energy density of the battery cell is a problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell, a battery, and an electric device to improve the energy density of the battery cell.

The first aspect of the present application provides a battery cell, which includes a housing, a terminal, and an electrode assembly, wherein at least one wall of the housing is provided with a housing wall hole; the pole is arranged on at least one shell wall and comprises a pole body, the pole body is provided with a pole hole, and the pole hole is communicated with the shell wall hole; an electrode assembly is disposed in the receiving cavity of the housing, the electrode assembly including a body portion and a tab extending from the body portion toward the at least one sidewall, the tab passing through the wall hole and the post hole and electrically connected to the post.

In the technical scheme of this application embodiment, set up utmost point post hole on utmost point post, and this utmost point post hole link up with the conch wall hole, when the assembly battery is single like this, can make utmost point ear directly wear out and be connected with utmost point post electricity from the utmost point post hole of utmost point post, and need not to buckle utmost point ear, just so need not to reserve and roll over utmost point ear space, and then improve the free energy density of battery. And just because need not to reserve the space of book utmost point ear, just can cancel the lower plastic part of end cover downside, the excessive space can be used for widening the width of electrode subassembly, improves the free energy density of battery. And the tab does not need to be bent, so that the short circuit risk caused by bending the tab is avoided, and the safety of the battery monomer is improved.

In some embodiments, conductive adhesive is filled between the tab and the inner wall of the pole hole, so that the tab is electrically connected with the pole. The tab penetrates into the pole hole after being prewelded, and the electric connection between the tab and the pole is ensured by coating the conductive adhesive.

In some embodiments, the tab includes a connecting end connected to the main body portion and an extension section extending outwardly from the connecting end, the end of the extension section being flush with the axial end face of the post body. The tip of the extension section of utmost point ear and the axial terminal surface parallel and level of utmost point post body, utmost point ear extends in the inside in utmost point post hole like this to fill the conducting resin and can realize the electricity between utmost point ear and the utmost point post and be connected between the inner wall in utmost point ear and utmost point post hole, and then simplify the free assembling process of battery.

In some embodiments, the tab includes a connection end connected to the main body portion and an extension section extending outward from the connection end, and the extension section includes a bending section bending toward the axial end face of the post body. The utmost point ear includes the bending segment of buckling to the axial terminal surface in utmost point post hole, and the bending segment is connected with the axial terminal surface laminating in utmost point post hole, and the axial end in utmost point post hole forms spacingly to the bending segment like this, prevents utmost point ear throw-off utmost point post hole, and then improves the connection reliability between utmost point ear and the utmost point post.

In some embodiments, the axial end face of the post body has a groove with the bend section disposed within the groove. The axial end face of one side at utmost point post body sets up the recess, and this recess is used for placing the bending segment, makes the bending segment in putting into the recess like this, and the axial end face of utmost point post body still is the parallel and level, and then makes things convenient for the connection of utmost point post piece.

In some embodiments, the pole bore and the shell wall bore are coaxially disposed. Therefore, the through direction of the shell wall hole and the pole column hole is consistent, the pole lugs can penetrate out of the shell wall hole and the pole column hole more smoothly, and further the damage to the pole lugs caused by the inner wall of the shell wall hole and/or the pole column hole is avoided.

In some embodiments, the battery cell further includes a post tab disposed outside the axial end face of the post body to cover the post hole. The pole piece is arranged on the outer side of the axial end face of the pole and covers the whole top end of the pole, and therefore the sealing performance of the battery monomer is improved.

In some embodiments, the post further comprises a rim disposed circumferentially outward of the post body, the post piece being flush with the rim. After covering the pole piece and setting up the top at utmost point post body, the top surface of utmost point post piece and the top surface of chimb are the parallel and level, can prevent that utmost point post body from exposing in the outside.

In some embodiments, the housing includes a casing and an end cap, the casing includes two first side walls perpendicular to and opposite to the first direction, two second side walls perpendicular to and opposite to the second direction, and a bottom wall perpendicular to the third direction, the first direction, the second direction and the third direction are perpendicular to each other, the casing has an opening opposite to the bottom wall, the end cap is disposed at the opening, two poles are disposed on the end cap, the electrode assembly includes two tabs with opposite polarities protruding to one side of the end cap, and the two tabs and the two poles are correspondingly electrically connected. Like this two utmost point posts all set up in same one side, make things convenient for the arrangement and the connection of a plurality of battery monomer in the battery.

In some embodiments, the case includes a casing and two end caps, the casing penetrates in the first direction and has two openings disposed opposite to each other, the two end caps are respectively disposed with the two openings and are respectively disposed with the two terminals, the electrode assembly includes two tabs with opposite polarities respectively extending from two ends in the first direction, and the two tabs and the two terminals are correspondingly electrically connected. The two free poles of the battery are respectively arranged at two ends in the length direction by the arrangement, so that the series connection of the battery monomers is facilitated.

The second aspect of the present application provides a battery, including the above battery cell.

In a third aspect, the present application provides an electric device, comprising the above battery, wherein the battery is used for providing electric energy.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

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 according to some embodiments of the present application.

Fig. 3 is a schematic perspective view of a battery cell according to some embodiments of the present disclosure.

Fig. 4 is an exploded view of a battery cell according to some embodiments of the present application.

Fig. 5 is a schematic top view of a battery cell according to some embodiments of the present disclosure.

Fig. 6 is a sectional view of the battery cell shown in fig. 5 in a direction a-a.

Fig. 7 is an exploded view of a battery cell according to another embodiment of the present disclosure.

Fig. 8 is a schematic front view of a battery cell according to another embodiment of the present disclosure.

Fig. 9 is a cross-sectional view of the battery cell shown in fig. 8 in the B-B direction.

In the drawings, the drawings are not necessarily to scale.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

a box 10, a first part 11, a second part 12;

the battery cell 20, the case 21, the electrode assembly 22, the body portion 221, the tab 222, the end cap 23, the case wall hole 231, the pole 24, the pole hole 241, the pole piece 25;

a first direction X, a second direction Y, a third direction Z.

Detailed Description

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

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

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

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

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

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

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

The current battery cell generally includes a case and an electrode assembly accommodated in the case, and an electrolyte is filled in the case. The electrode assembly is a component in which electrochemical reactions occur in the battery cell. One or more electrode assemblies may be contained within the housing. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. In order to improve the overcurrent capacity, the lug comprises a plurality of layers of lug sheets which are arranged in a stacked mode, in the charging and discharging process of the battery monomer, the positive active material and the negative active material react with electrolyte, and the lug is connected with the pole column to form a current loop.

In the process of processing the battery cell, generally, the tab of the electrode assembly is welded to the adapter plate, then the adapter plate is welded to the terminal on the end cover, and finally the tab is bent and then placed into the housing. Just because need buckle the utmost point ear, consequently the lower surface of end cover all need be provided with the lower plastic of certain thickness in order to reserve the space of rolling over the utmost point ear, consequently the space that the plastic corresponds down is not effectively utilized, influences energy density's promotion.

In addition, the inventor of the present application has noticed that, since the tab includes a plurality of layers of tab pieces, the layers of the tab are easily separated from each other after bending. Moreover, the layer-to-layer divergence of the tab may also cause the tab to be inserted upside down into the main body portion and to be short-circuited with the pole piece below the tab, thereby causing a safety problem.

In order to effectively utilize the space inside the shell to improve the energy density of the battery monomer, the inventor researches and discovers that the through hole can be formed in the pole, the pole lug directly penetrates out of the through hole of the pole and is electrically connected with the pole lug without bending the pole lug, so that the space for bending the pole lug is not required to be reserved, and the energy density of the battery monomer is further improved. And just because need not to reserve the space of book utmost point ear, just can cancel the lower plastic part of end cover downside, the excessive space can be used for widening the width of electrode subassembly, improves the free energy density of battery.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. A power supply system including the electric device composed of the battery cell, the battery, and the like disclosed in the present application may be used.

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

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

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

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20. The battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure having one open end, the first part 11 may be a plate-shaped structure, and the first part 11 is covered on the open side of the second part 12 such that the first part 11 and the second part 12 together define a receiving space. The first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

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

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is a schematic perspective view of a battery cell 20 according to some embodiments of the present disclosure. As shown in fig. 3 and with reference to fig. 6, the battery cell 20 includes a case 21, an electrode assembly 22, an end cap 23, a post 24, and other functional components.

The case 21 is an assembly forming an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, an electrolyte, and other components. The housing 21 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 21 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained within the case 21. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portion 221 of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab 222. In order to increase the current capacity, the tab 222 includes a plurality of tab pieces arranged in a stacked manner. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 222 is electrically connected with the pole 24 to form a current loop.

The end cap 23 refers to a member that covers an opening of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 23 may be adapted to the shape of the housing 21 to fit the housing 21. Alternatively, the end cap 23 may be made of a material (e.g., an aluminum alloy) with certain hardness and strength, so that the end cap 23 is not easily deformed when being extruded and collided, the single battery 20 can have higher structural strength, the safety performance can be improved, and the end cap 23 may be provided with functional components such as the terminal 24. The terminal post 24 is used to electrically connect with the electrode assembly 22 for outputting or inputting electric energy of the battery cell 20. In some embodiments, the end cap 23 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or the temperature of the battery cell 20 reaches a threshold value, and the end cap 23 may also be made of various materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 23, which may be used to isolate the electrical connection components within the housing 21 from the end cap 23 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The housing 21 and the end cap 23 may be separate components. Without limitation, the housing 21 and the end cap 23 may be integrated, and specifically, the housing 21 and the end cap 23 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 21, the end cap 23 covers the housing 21.

In the embodiment shown in fig. 3 and 4, the housing 21 has one opening, and the corresponding cell requires only one end cap 23 to close the one opening. In other embodiments not shown in the figures, the housing 21 may also have two openings arranged opposite to each other, and the two end caps 23 are required for the respective battery cells to close the two openings.

Referring to fig. 3-6, fig. 3 illustrates a perspective view of a battery cell 20 according to some embodiments of the present disclosure. Fig. 4 shows an exploded view of the battery cell 20 according to some embodiments of the present application. Fig. 5 shows a schematic top view of the battery cell 20 according to some embodiments of the present disclosure. Fig. 6 shows a cross-sectional view of the battery cell 20 shown in fig. 5 in the a-a direction.

The embodiment of the present application provides a battery cell 20. The battery cell 20 includes a case having a case wall hole provided in at least one of the case walls, a terminal post 24, and an electrode assembly 22. The pole 24 is arranged on at least one of the housing walls. The post 24 includes a post body having a post hole 241. The post hole 241 communicates with the shell wall hole. Electrode assembly 22 is placed within the receiving cavity of the housing. The electrode assembly 22 includes a body portion 221 and tabs 222 protruding from the body portion 221 toward at least one case wall. The tab 222 passes through the shell and post holes 241 and is electrically connected to the post 24.

As shown in fig. 3, the first direction X is a length direction of the battery cell 20, the second direction Y is a thickness direction of the battery cell 20, and the third direction Z is a height direction of the battery cell 20.

As shown in fig. 4, the housing includes a case 21 and an end cap 23. The housing 21 includes two first sidewalls disposed perpendicular to and opposite to the first direction X, two second sidewalls disposed perpendicular to and opposite to the second direction Y, and a bottom wall perpendicular to the third direction Z. The housing 21 has an opening disposed opposite the bottom wall. The end cap 23 is provided at the opening to form an outer shell together with the case 21. That is, in the embodiment shown in fig. 4, the housing 21 and the end cap 23 are combined together to form an outer shell. The end cap 23 is provided with two poles 24. As shown in fig. 6, the end cap 23 is provided with two housing wall holes 231 provided corresponding to the two poles 24. The housing wall hole 231 penetrates in the thickness direction of the end cap 23. The end cap 23 now forms at least one wall of the housing.

In other embodiments, the housing may include a housing 21 and two end caps 23. The housing 21 includes two first sidewalls perpendicular to and opposite to the first direction X and two second sidewalls perpendicular to and opposite to the second direction Y, at this time, the housing 21 has two openings opposite to each other in the third direction Z, and the two end caps 23 are respectively disposed at the two openings to form a housing. In other embodiments, the housing 21 includes two openings disposed therethrough in the first direction X, and two end caps 23 are respectively disposed at the two openings to form an outer shell. And the two end caps 23 are respectively provided with a pole 24, and at this time, the two end caps 23 both form at least one shell wall of the shell.

In the above embodiment, the pole 24 is arranged on the end cap 23, that is to say at least one of the housing walls is formed by the end cap 23 arranged separately from the housing 21. In other embodiments, however, at least one wall may be formed by one wall of the housing 21. For example, the housing 21 includes two first sidewalls disposed perpendicular to and opposite to the first direction X, two second sidewalls disposed perpendicular to and opposite to the second direction Y, and at least one opening disposed in the third direction. The two first side walls are respectively provided with a pole. Then the two first side walls are provided with a wall opening such that the two first side walls form at least one wall of the outer shell. In summary, the at least one wall of the housing in the above embodiments refers to the wall of the pole mounting case, which may be either the end cap or a wall of the housing.

As shown in fig. 4, the pole 24 is disposed on at least one of the housing walls. Specifically, the pole 24 is provided on the end cap 23. The post 24 has a post hole 241. As shown in fig. 6, the pole hole 241 communicates with the housing wall hole 231. The penetrating directions of the pole post hole 241 and the housing wall hole 231 are the same so that the pole post hole communicates with the housing wall hole, so that the tab 222 can pass through the housing wall hole 231 and the pole post hole 241 in order from the inside of the housing 21 and be electrically connected to the pole 24.

In the embodiment shown in fig. 4, the tab 222 extends in the third direction Z relative to the body portion 221. The housing wall hole 231 provided in the end cap 23 and the post hole 241 of the post 24 are both through-penetrating in the third direction Z. That is, the penetrating direction of the pole post hole 241 and the shell wall hole 231 is the same as the extending direction of the tab 222, so that the tab 222 can directly penetrate into the shell wall hole 231 and the pole post hole 241 without being bent.

As shown in fig. 4 to 6, the electrode assembly 22 is placed in the receiving cavity of the case. The electrode assembly 22 includes a body portion 221 and two tabs 222 of opposite polarities protruding from the body portion 221 toward at least one case wall. The tab 222 passes through the housing wall hole 231 and the pole hole 241 and is electrically connected to the corresponding pole 24. That is to say, the direction of extension of the tab 222 is the direction of arrangement of at least one housing wall, that is to say the direction of arrangement of the pole 24, only in such a way that the tab 222 can be passed through the housing wall opening and the pole opening without being bent.

Also, as shown in fig. 4, the battery cell 20 includes two electrode assemblies 22 arranged side by side. The tabs 222 of the two electrode assemblies 22 having the same polarity are connected together by welding or the like, and then are led out through the case wall hole 231 and the pole hole 241. For the battery cell 20 having only one electrode assembly 22, since the tabs 222 of the electrode assembly 22 are formed of a plurality of tab sheets, the tabs 222 need to be pre-welded to be integrated before passing through the case wall holes 231 and the pole holes 241, thereby facilitating subsequent punching.

Set up utmost point post hole 241 on utmost point post 24, and this utmost point post hole 241 link up with conch wall hole 231, like this when assembling battery monomer 20, can make utmost point ear 222 directly wear out and be connected with utmost point post 24 electricity from utmost point post hole 241 of utmost point post 24, and need not to buckle utmost point ear 222, just so need not to reserve and roll over utmost point ear space, and then improve battery monomer 20's energy density. And because the space of the folded tab is not required to be reserved, the lower plastic part on the lower side of the end cover 23 can be eliminated, and the extra space can be used for widening the width of the electrode assembly 22, so that the energy density of the battery monomer is improved. And the tab does not need to be bent, so that the short circuit risk caused by bending the tab is avoided, and the safety of the battery monomer is improved.

According to some embodiments of the present application, referring to fig. 6, the pole bore 241 and the housing wall bore 231 are coaxially disposed.

As shown in fig. 6, the housing wall hole 231 and the pole hole 241 are coaxially arranged to penetrate in the third direction Z. As shown in fig. 4, the housing wall hole 231 and the pole hole 241 are rectangular holes each having a rectangular cross section, and the length and width of the housing wall hole 231 and the pole hole 241 are the same. In other embodiments, the shell wall hole 231 and the pole hole 241 may have other shapes, such as oblong holes.

Therefore, the through directions of the shell wall hole 231 and the pole hole 241 are consistent, and the tab 222 can penetrate out of the shell wall hole 231 and the pole hole 241 more smoothly, so that the damage of the inner wall of the shell wall hole 231 and/or the pole hole 241 to the tab 222 is avoided.

Referring to fig. 6, according to some embodiments of the present application, the tab 222 includes a connection end connected with the body portion 221 and an extension extending outward from the connection end. The end of the extension is flush with the axial end face of the pole bore 241.

As shown in fig. 6, the tab 222 extends upward in the third direction Z from the body portion 221. Specifically, the bottom ends of the tabs 222 are connected with the body portion 221 to form a connection end. As shown in fig. 4, the pole post 24 includes a pole post body in the middle and a flange extending along the circumference of the pole post body

The end of the extension section of the tab 222 is flush with the axial end face of the pole body, so that the tab 222 extends in the pole hole 241, and the conductive adhesive is filled between the inner walls of the tab 222 and the pole hole 241 to realize the electric connection between the tab 222 and the pole 24, thereby simplifying the assembly process of the battery cell 20.

According to some embodiments of the present application, referring to fig. 6, a conductive adhesive is filled between the tab 222 and the inner wall of the post hole 241 so that the tab 222 is electrically connected with the post 24.

The tab 222 is inserted into the post hole 241 after pre-welding, and the electrical connection between the tab 222 and the post 24 is ensured by coating conductive adhesive. It should be noted that in this embodiment, the tab 222 needs to pass through the casing wall hole 231 provided in the end cover 23, and then an insulating member needs to be provided inside the casing wall hole 231 for insulation.

Also, the electrode assembly 22 of the embodiment of the present application further includes an insulating layer, such as blue gel, disposed outside the body portion 221 for insulation. Since the insulating layer is provided on the outer side of the body portion 221 to ensure insulation between the electrode assembly 22 and the case, mylar and a base sheet do not need to be provided in the case, thereby reducing the cost.

According to some embodiments of the present application, the battery cell further includes a pole piece 25, the pole piece 25 being disposed outside the axial end face of the pole body to cover the pole hole 241.

As shown in fig. 4 and 6, the tab 222 passes through the post hole 241 and extends to the top end of the post hole 241, and then conductive adhesive is applied between the inner wall of the post hole 241 and the tab 222 to achieve the electrical connection between the tab 222 and the tab 24. Then the top end of the post hole 241 includes conductive paste and a tab, and sealability cannot be guaranteed. In order to ensure the sealing performance of the battery cell, a pole piece 25 is provided on the outer side of the axial end face of the pole 24, and the pole piece 25 covers the entire top end of the pole 24, thereby improving the sealing performance of the battery cell.

According to some embodiments of the present application, the pole 24 further comprises a raised edge disposed axially outward of the pole body, the pole piece 25 being flush with the raised edge.

As shown in fig. 4, the post 24 includes a post body in the middle and a rim disposed around the post body. In the axial direction, the convex edge is higher than the axial end face of the pole body. As shown in fig. 3, after the pole piece 25 is covered and disposed on the top end of the pole body and the pole piece 25 is welded to the flange, the top surface of the pole piece 25 is flush with the top surface of the flange, so that the pole body can be prevented from being exposed to the outside, and the sealing performance is ensured.

Referring to fig. 7 to 9, according to further embodiments of the present application, the tab 222 includes a connection end connected with the body portion 221 and an extension extending outward from the connection end. The extension section includes a bent section bent toward the axial end face of the pole hole 241.

As shown in fig. 7 and 9, in this embodiment, since the end of the extension of the tab 222 protrudes beyond the post hole 241, the extension of the tab 222 needs to be bent toward the post hole 241 and the bent portion is formed. In this way, when the battery cell 20 is assembled, after the tab 222 is inserted through the case wall hole 221 and the pole hole 241, the end of the tab 222 is bent to form a bent section, and the bent section is bent toward the pole hole 241 and is attached to the axial end surface of the pole hole 241.

The tab 222 comprises a bending section which is bent towards the axial end face of the pole column hole 241, the bending section is attached to the axial end face of the pole column hole 241, and therefore the axial end face of the pole column hole 241 is limited in the bending section, the tab 222 is prevented from being separated from the pole column hole 241, and the connection reliability between the tab 222 and the pole column 24 is improved.

Referring to fig. 7, according to other embodiments of the present application, an axial end face of the post body has a groove with a bend section disposed therein.

As shown in fig. 7, the axial end face of one side of the pole body is provided with a groove, the depth of the groove is the same as the thickness of the bending section of the tab 222, so that after the bending section is arranged in the groove, the two sides of the pole hole 241 are flush, and the pole piece 25 can be electrically connected with the bending section.

The axial end face of one side at utmost point post body sets up the recess, and this recess is used for placing the bending segment, makes the bending segment in putting into the recess like this, and the axial end face of utmost point post body still is the parallel and level, and then makes things convenient for the connection of utmost point post piece 25.

After the bending section is bent and adapted to be placed in the groove on one side of the pole body, the pole piece 25 is welded with the bending section and the pole body, and then the electric connection between the pole lug and the pole is realized.

According to some embodiments of the present application, the housing includes a housing body 21 and an end cap 23, the housing body 21 includes two first side walls disposed perpendicular to and opposite to the first direction, two second side walls disposed perpendicular to and opposite to the second direction, and a bottom wall perpendicular to the third direction, the housing body 21 has an opening disposed opposite to the bottom wall, the first direction, the second direction and the third direction are perpendicular to each other, and the end cap 23 is disposed at the opening to form the housing together with the housing body 21. The end cap 23 is provided with two poles 24. The two poles 24 are electrically connected with the two tabs correspondingly.

In the embodiment shown in fig. 4, the housing 21 and the end cap 23 are combined together to form an outer shell. As shown in fig. 6, the end cap 23 is provided with two housing wall holes 231 provided corresponding to the two poles 24. The housing wall hole 231 penetrates in the thickness direction of the end cap 23. The end cap 23 now forms at least one wall of the housing.

Thus, the two terminals 24 are disposed on the same side, which facilitates the arrangement and connection of the plurality of battery cells 20 in the battery.

In other embodiments, the casing includes a casing 21 and two end caps 23, the casing 21 penetrates in the first direction X and has two openings oppositely disposed, the two end caps 23 are respectively disposed with the two openings and are both provided with a terminal, the electrode assembly includes two tabs with opposite polarities respectively extending from two ends of the first direction, and the two tabs and the two terminals are correspondingly electrically connected.

The two free poles of the battery are respectively arranged at two ends in the length direction by the arrangement, so that the series connection of the battery monomers is facilitated.

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

Claims (12)

1. A battery cell, comprising:

a housing having a housing wall aperture (231) disposed in at least one housing wall of the housing;

a pole (24) disposed on the at least one housing wall, the pole (24) comprising a pole body having a pole bore (241), the pole bore (241) in communication with the housing wall bore (231); and

an electrode assembly (22) disposed in the receiving cavity of the case, the electrode assembly (22) including a body portion (221) and a tab (222) protruding from the body portion (221) toward the at least one side wall, the tab (222) passing through the case wall hole (231) and the pole post hole (241) and electrically connected to the pole post (24).

2. The battery cell according to claim 1, wherein a conductive adhesive is filled between the tab (222) and the inner wall of the pole hole (241) to electrically connect the tab (222) and the pole (24).

3. The battery cell as recited in claim 1, wherein the tab (222) includes a connection end connected to the main body portion (221) and an extension section extending outwardly from the connection end, the extension section having an end flush with an axial end face of the post body.

4. The battery cell as recited in claim 1, wherein the tab (222) comprises a connection end connected to the main body portion (221) and an extension section extending outwardly from the connection end, the extension section comprising a bent section bent toward an axial end face of the post body.

5. The battery cell according to claim 4, characterized in that the axial end face of the pole (24) has a groove, the bent section being arranged in the groove.

6. A battery cell according to any of claims 1 to 5, characterised in that the pole bore (241) and the housing wall bore (231) are arranged coaxially.

7. The battery cell according to any one of claims 1 to 5, further comprising a pole post piece (25), the pole post piece (25) being disposed outside an axial end face of the pole body to cover the pole post hole (241).

8. The battery cell according to claim 7, characterized in that the pole (24) further comprises a raised edge arranged on the circumferential outer side of the pole body, the pole piece (25) being flush with the raised edge.

9. The battery cell according to any of claims 1 to 5, characterized in that the housing comprises a casing (21) and an end cap (23), the shell (21) comprises two first side walls which are vertical to and opposite to the first direction, two second side walls which are vertical to and opposite to the second direction and a bottom wall which is vertical to the third direction, the first direction, the second direction and the third direction being perpendicular to each other, the housing (21) having an opening disposed opposite to the bottom wall, the end cover (23) is arranged at the opening, two polar columns (24) are arranged on the end cover (23), the electrode assembly (22) comprises two tabs (222) with opposite polarities and extending out to one side of the end cover (23), the two polar lugs (222) are correspondingly and electrically connected with the two polar columns (24).

10. The battery cell according to any one of claims 1 to 5, wherein the housing comprises a casing (21) and two end covers (23), the casing (21) penetrates in a first direction and has two openings oppositely arranged, the two end covers (23) are respectively arranged at the two openings, the two end covers (23) are respectively provided with the poles (24), the electrode assembly (22) comprises two tabs (222) respectively extending from two ends in the first direction, the two tabs (222) and the two poles (24) are respectively electrically connected, and the two tabs (222) and the two poles (24) are oppositely connected.

11. A battery comprising the battery cell of any one of claims 1 to 10.

12. An electrical device comprising a battery as claimed in claim 11 for providing electrical energy.

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