CN218274819U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application relates to a battery cell, a battery and an electric device. The battery cell includes a case including a first wall, an electrode assembly, a current collecting member, and a first sealing member; the electrode assembly is arranged in the shell and provided with a tab; the current collecting component is accommodated in the shell and is electrically connected with the pole lug, and the current collecting component is welded on the first wall to form a welding area; a first seal is sandwiched between the first wall and the current collecting member and surrounds the weld zone. The battery monomer, battery and electric device that this application embodiment provided aim at promoting the free anticreep liquid performance 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

The battery cell is widely used in electronic devices such as a mobile phone, a notebook computer, a battery car, an electric airplane, an electric ship, an electric toy car, an electric toy ship, an electric toy airplane, an electric tool, and the like. The battery monomer can comprise a cadmium-nickel battery monomer, a hydrogen-nickel battery monomer, a lithium ion battery monomer, a secondary alkaline zinc-manganese battery monomer and the like.

In addition to improving the performance of the battery cell, safety issues are also a considerable problem in the development of battery technology. If the safety problem of the battery cell cannot be guaranteed, the battery cell cannot be used. Therefore, how to enhance the safety of the battery cell is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application provides a battery monomer, battery and power consumption device aims at promoting the free anticreep liquid performance of battery.

In a first aspect, the present application is directed to a battery cell comprising a housing, an electrode assembly, a current collecting member, and a first seal, the housing comprising a first wall; the electrode assembly is arranged in the shell and provided with a tab; the current collecting component is accommodated in the shell and is electrically connected with the pole lug, and the current collecting component is welded on the first wall to form a welding area; a first seal is sandwiched between the first wall and the current collecting member and surrounds the weld zone.

According to the battery cell, the first sealing piece is clamped between the first wall and the current collecting component and surrounds the welding area, so that the first sealing piece is utilized to support the first wall and the current collecting component at the same time, uneven welding stress caused by different materials of the first wall and the current collecting component is relieved, and the possibility of welding crack generation is reduced.

According to one embodiment of the first aspect of the present application, the current collecting member includes a first body portion and a first protrusion portion protruding from a surface of the first body portion facing the first wall; the first projection is welded with the first wall and forms a welding area; the first seal is disposed around the first projection and sandwiched between the first body portion and the first wall.

According to the battery cell of the embodiment of the application, the welding area is formed by welding the first protruding part and the first wall, and the first sealing element is arranged around the first protruding part, namely the first sealing element is arranged around the welding area, so that the welding area is further isolated from the area where the electrolytic medium is stored, and the liquid leakage prevention performance is further improved.

According to one embodiment of the first aspect of the present application, the current collecting member is formed with a first recess at a position corresponding to the first projection, the first recess being recessed with respect to a surface of the first body portion facing away from the first wall.

According to the battery cell, the current collecting member is arranged to form the first concave part at the position corresponding to the first convex part, so that the thickness of a welding area is reduced, the welding power of subsequent welding is reduced, and the reliability of the battery cell is further improved.

According to an embodiment of the first aspect of the present application, the first protrusion has a ring-shaped cross-section.

According to the single battery, the cross section of the first protruding portion is annular, so that the welding points between the current collecting component and the first wall are annular, the welding performance between the current collecting component and the first wall is guaranteed, meanwhile, the arrangement of the welding points is reduced, and the reliability of the single battery is further improved.

According to an embodiment of the first aspect of the present application, the first sealing member comprises a first protrusion, and the first protrusion is arranged around the first sealing member.

According to the battery monomer of this application embodiment, through setting up the second sealing member to set up first bulge and encircle the setting of second sealing member, the second sealing member encircles respectively in the inside and outside both sides that are annular first bulge with first sealing member, so that the first sealing member of second sealing member cooperation will be annular welding zone seal, has further promoted the free leak protection liquid performance of battery.

According to an embodiment of the first aspect of the present application, the first wall includes a second body portion and a second protrusion portion protruding from a surface of the second body portion facing the first body portion; the first protruding part and the second protruding part are abutted and welded to form a welding area; the first seal is sandwiched between the first body portion and the second projection.

According to the battery cell, the second protruding portion protrudes out of the surface, facing the first body portion, of the second body portion, the first protruding portion and the second protruding portion are abutted and welded to form a welding area, and the second protruding portion is arranged to facilitate the arrangement of a welding seam.

According to one embodiment of the first aspect of the present application, the first wall is formed with a second recess at a position opposite to the second projection, the second recess being recessed with respect to a surface of the second body portion facing away from the current collecting member.

According to the battery cell provided by the embodiment of the application, the thickness of the welding area can be reduced by arranging the second concave part, so that the welding power of subsequent welding is reduced, and the reliability of the battery cell is further improved.

According to an embodiment of the first aspect of the present application, the housing comprises a shell having an opening and an end cap for covering the opening; the end cap is a first wall.

According to the battery monomer of this application embodiment, set up the end cover and be first wall, set up the second bulge through the one side at the end cover towards the mass flow component promptly for the second bulge is in welding track department and the contact of mass flow component butt, is favorable to going on of follow-up welding process, avoids appearing welding crack, has further promoted the free leak protection liquid performance of battery.

In a second aspect, the present application provides a battery including a battery cell as provided in any embodiment of the first aspect of the present application.

In a third aspect, the present application provides an electrical device comprising a battery as provided in any of the embodiments of the second aspect of the present application, the battery being configured to provide electrical energy.

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 partial structure of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded view of a battery according to an embodiment of the present application;

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

fig. 4 is an enlarged view of a portion a of the battery cell shown in fig. 3;

fig. 5 is a schematic structural view of a current collecting member, a first sealing member, and a second sealing member in a battery cell according to an embodiment of the present disclosure;

fig. 6 is a schematic structural view of a first wall in a battery cell according to an embodiment of the present application;

fig. 7 is a schematic structural view of a current collecting member, a first sealing member, a second sealing member, and a first wall in a battery cell according to an embodiment of the present disclosure.

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

Wherein, in the figures, the respective reference numerals: 1. a vehicle; 1000. a battery; 1a, a motor; 1b, a controller; 100. a battery cell; 101. a bottom case; 102. a top shell; 103. a battery module;

10. a housing; 11. a first wall; 111. a second body portion; 112. a second projection; 113. a second recess;

20. an electrode assembly; 21. a tab;

30. a current collecting member; 31. a first body portion; 32. a first projecting portion; 33. a first recess;

40. a first seal member;

50. a second seal member; 104. a welding area.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application, but are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery monomer of this application embodiment is mainly to the battery monomer that adopts the cylindricality encapsulation, and this battery monomer can be cylinder, rectangular column body, etc.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The inventor finds that in the battery cell of the related art, due to the difference of the materials of the current collecting component and the shell, different metals are generally required to be welded, the different metals have different melting points, and cannot be mutually dissolved to form a new phase during welding, so that accidental welding cracks can be generated in the crystallization process due to the uneven stress of the current collecting component and the shell, and if the welding cracks occur, the leakage of an electrolytic medium in the shell is inevitably caused, and potential safety hazards exist.

Based on the above problems discovered by the inventor, the inventor improves the structure of the battery cell, and the technical solution described in the embodiment of the present application is applicable to the battery cell, the battery and the electric device.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a 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 extending vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.

Fig. 1 is a partial structural schematic view of a vehicle according to an embodiment of the present application.

As shown in fig. 1, a battery 1000 is provided inside the vehicle 1. The battery 1000 may be disposed at the bottom or the head or the tail of the vehicle 1. The battery 1000 may be used for power supply of the vehicle 1, and for example, the battery 1000 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 1000 to supply power to the motor 1a, for example, for operation power demand at the time of starting, navigation, and traveling of the vehicle 1.

In some embodiments of the present application, the battery 1000 may be used not only as an operation power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure.

As shown in fig. 2, the battery 1000 includes a battery cell 100. The battery 1000 may further include a case for accommodating the battery cell 100.

The case is used for accommodating the battery cell 100, and the case may have various structural forms.

In some embodiments, the case may include a bottom case 101 and a top case 102. The bottom case 101 and the top case 102 are mutually closed. The bottom case 101 and the top case 102 together define a receiving space for receiving the battery cell 100. The bottom case 101 and the top case 102 may be both hollow structures having one side opened. The open side of the bottom case 101 covers the open side of the top case 102, forming a box body having an accommodation space.

One of the bottom case 101 and the top case 102 may include a main body portion having both ends opened and an end case covering one end of the main body portion, and the other of the bottom case 101 and the top case 102 covers the other end of the main body portion opened to form a box body having an accommodating space.

A sealing member may be further disposed between the bottom case 101 and the top case 102 to achieve a sealed connection between the bottom case 101 and the top case 102.

The bottom case 101 and the top case 102 may be various shapes, for example, a cylinder, a rectangular parallelepiped, etc. In fig. 2, the bottom case 101 and the top case 102 are each exemplarily a rectangular parallelepiped structure.

In the battery 1000, one or more battery cells 100 may be provided. If there are a plurality of battery cells 100, the plurality of battery cells 100 may be connected in series, in parallel, or in series-parallel. The series-parallel connection means that a plurality of battery cells 100 are connected in series or in parallel. The plurality of battery cells 100 may be directly connected in series or in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 100 is accommodated in the box, or the plurality of battery cells 100 may be connected in series or in parallel or in series-parallel to form the battery module 103. The plurality of battery modules 103 are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case.

Fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure; fig. 4 is an enlarged view of a portion a of the battery cell shown in fig. 3; fig. 5 is a schematic structural view of a current collecting member, a first sealing member, and a second sealing member in a battery cell according to an embodiment of the present disclosure; fig. 6 is a schematic structural view of a first wall in a battery cell according to an embodiment of the present application; fig. 7 is a schematic structural view of a current collecting member, a first sealing member, a second sealing member, and a first wall in a battery cell according to an embodiment of the present disclosure.

As shown in fig. 3 to 7, the present embodiment provides a battery cell 100 including a case 10, an electrode assembly 20, a current collecting member 30, and a first sealing member 40, the case 10 including a first wall 11; the electrode assembly 20 is disposed in the case 10 and has tabs 21; the current collecting member 30 is received in the case 10 and electrically connected to the tab 21, the current collecting member 30 is welded to the first wall 11 and forms a welding region 104; the first seal member 40 is sandwiched between the first wall 11 and the current collecting member 30 and surrounds the weld zone 104.

The case 10 serves to provide a sealed space for the electrode assembly 20 and an electrolytic medium. In general, the material of the case 10 may be steel to improve the structural strength of the battery cell 100, so as to stabilize the space for accommodating the electrode assembly 20 and the electrolyte.

In a typical battery cell structure, the electrode assembly 20 includes a positive electrode tab, a negative electrode tab, and a separator. The lithium ion battery cell mainly depends on the movement of lithium ions between the positive pole piece and the negative pole piece to work. For example, lithium ion battery cells use an intercalated lithium compound as an electrode material. The main common positive electrode materials currently used for lithium ion batteries are: lithium cobalt oxide (LiCoO 2), lithium manganate (LiMn 2O 4), lithium nickelate (LiNiO 2), and lithium iron phosphate (LiFePO 4). The separator is disposed between the positive and negative electrode sheets to form a thin film structure having three layers of materials. The film structure is generally manufactured into an electrode assembly having a desired shape by winding or stacking. For example, the film structure of three layers of materials in a cylindrical battery cell is wound into an electrode assembly having a cylindrical shape, while the film structure is wound or stacked into an electrode assembly having a substantially rectangular parallelepiped shape in a square battery cell.

The material of the isolation film can be PP or PE, etc. In some embodiments, the electrode assembly may be of a coiled or laminated construction.

The electrode assembly 20 has tabs 21, meaning that the positive and negative electrode tabs in the electrode assembly 20 include tabs. Specifically, the positive pole piece comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active substance layer protrudes out of the positive pole current collector which is coated with the positive pole active substance layer, the positive pole current collector which is not coated with the positive pole active substance layer is used as a positive pole lug, the positive pole current collector can be made of aluminum, and the positive pole active substance can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like; the negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together.

In some embodiments, a metal member having a thickness of about 2mm may also be formed by flattening the positive or negative electrode tab for subsequent connection to the current collecting member 30.

The current collecting member 30 is received in the case 10, and it is possible to implement that the current collecting member 30 is disposed at a portion of the case 10 adjacent to the end cap and serves to connect the tab with the electrode terminal on the end cap. For example, taking the battery cell 100 as a cylindrical battery, the positive electrode tab and the negative electrode tab are disposed opposite to each other, and at one end of the battery cell 100, the positive electrode tab is electrically connected to the end cap thereof through the current collecting member 30, and at the other end of the battery cell 100, the negative electrode tab is electrically connected to the end cap thereof through the current collecting member 30, and at this time, the end caps at the two ends are insulated from each other.

The first wall 11 may be an end cap at any end of the battery cells provided in the above embodiments, or may be end caps at both ends.

The welding zone 104 is used for providing a weld to weld and fix the current collecting member 30 to the first wall 11, and to connect the positive electrode terminal located on the first wall 11 with the positive electrode tab, and to connect the negative electrode terminal located on the first wall 11 with the negative electrode tab.

The first sealing member 40 surrounds the welding zone 104 and is clamped between the first wall 11 and the current collecting member 30, and it is possible to arrange the first sealing member 40 at the periphery of the welding zone 104, with both ends of the first sealing member 40 abutting against the first wall 11 and the current collecting member 30, respectively.

It should be noted that, when the first wall 11 and the current collecting member 30 are welded, the first sealing member 40 located between the first wall 11 and the current collecting member 30 is pressed to deform and is always in a stressed state. In this way, in the subsequent welding process of the first wall 11 and the current collecting member 30, since the materials of the first wall 11 and the current collecting member 30 are often different, the first wall 11 and the current collecting member 30 made of dissimilar metals have different melting points, and in the cooling crystallization stage after welding, opposite welding stress is generated between the first wall 11 and the current collecting member 30, so that the first sealing member 40 which is pressed to deform is arranged between the first wall 11 and the current collecting member 30, and the first sealing member 40 is used for simultaneously providing supporting force for the first wall 11 and the current collecting member 30 so as to neutralize the welding stress, thereby reducing the probability of welding cracks. The welding stress in the first sealing member 40 and at each position of the welding zone 104 can be used to avoid the occurrence of welding cracks due to uneven welding stress.

According to the battery cell 100 of the embodiment of the present application, the first sealing member 40 is disposed between the first wall 11 and the current collecting member 30 and surrounds the welding region 104, so that the first sealing member 40 simultaneously supports the first wall 11 and the current collecting member 30, and thus uneven welding stress caused by different materials of the first wall 11 and the current collecting member 30 is alleviated, and the possibility of welding cracks is reduced.

According to one embodiment of the first aspect of the present application, the current collecting member 30 includes a first body portion 31 and a first protrusion portion 32, the first protrusion portion 32 protruding from a surface of the first body portion 31 facing the first wall 11; the first projecting portion 32 is welded to the first wall 11 and forms a welding zone 104; the first seal 40 is disposed around the first projection 32 and sandwiched between the first body portion 31 and the first wall 11.

The first body portion 31 may include a first portion connected with the tab and a second portion connected with the first wall 11, so as to connect the tab with the first wall 11, the first portion being connected with at least part of the second portion.

In some embodiments, the first portion and the second portion may have a two-layer structure, and one end of the first portion and one end of the second portion may be connected by a connection portion having a curved shape. The first portion is intended to be connected to a tab, and the aforementioned first projecting portion 32 is formed by projecting the second portion toward the side close to the first wall 11.

The first protrusion 32 protrudes from the surface of the first body 31 facing the first wall 11, which means that the first protrusion 32 protrudes from the surface of the second portion facing the first wall 11.

The position of the first protrusion 32 can be selected from the position of the welding seam between the second portion and the first wall 11, and the position of the first protrusion 32 is equivalent to providing a positioning for the arrangement of the first sealing member 40, i.e. the position of the welding zone 104 is marked by the first protrusion 32, and the first sealing member 40 is arranged around the first protrusion 32 to avoid the arrangement of the first sealing member 40 into the welding zone 104.

Meanwhile, by disposing the first sealing member 40 around the first projection 32, that is, disposing the first sealing member 40 around the welding region 104, the first sealing member 40 is provided to provide an isolation for the welding region 104, and the electrolytic medium is prevented from contacting the welding region 104.

According to the battery cell 100 of the embodiment of the present application, the welding area 104 is formed by providing the first protruding portion 32 and welding the first wall 11, and the first sealing member 40 is provided around the first protruding portion 32, that is, the first sealing member 40 is provided around the welding area 104, so as to further isolate the welding area 104 from the area where the electrolytic medium is stored, and further improve the liquid leakage prevention performance.

According to one embodiment of the first aspect of the present application, the current collecting member 30 is formed with a first recess 33 at a position corresponding to the first projection 32, the first recess 33 being recessed with respect to a surface of the first body portion 31 facing away from the first wall 11.

The first concave portion 33 is disposed at a position corresponding to the first protruding portion 32 to reduce the thickness of the first protruding portion 32, so as to greatly reduce the welding power of the subsequent welding.

In some embodiments, the first protrusion 32 may be formed by stamping, so as to form the first protrusion 32 and the first recess 33 simultaneously in a single process.

According to the battery cell 100 of the embodiment of the application, the first concave part 33 is formed at the position corresponding to the first protruding part 32 by arranging the current collecting member 30, so that the reliability of the battery cell 100 is further improved by reducing the thickness of the welding region 104 to reduce the welding power of the subsequent welding.

According to an embodiment of the first aspect of the present application, the first protrusion 32 has a ring-shaped cross-section.

The cross section of the first protrusion part 32 is annular, and a possible embodiment is that, in an embodiment where the battery cell 100 is a cylindrical battery, the cross section of the first protrusion part 32 may be in a circular ring concentric with the cross section of the cylindrical battery; in the embodiment where the battery cell 100 is a rectangular column, the cross section of the first protruding portion 32 may be a rectangular ring shape, which may be selected according to actual situations.

According to the battery cell 100 of the embodiment of the application, the cross section of the first protrusion 32 is annular, so that the welding point between the current collecting member 30 and the first wall 11 is annular, the welding performance between the current collecting member 30 and the first wall 11 is ensured, and meanwhile, the arrangement of the welding point is reduced, so that the reliability of the battery cell 100 is further improved.

According to an embodiment of the first aspect of the present application, further comprising a second seal 50, the first protrusion 32 is arranged around the second seal 50, and the second seal 50 is clamped between the first body portion 31 and the first wall 11.

The second seal 50 functions in the same manner as the first seal 40, and on the one hand, by sandwiching the second seal 50 between the first body portion 31 and the first wall 11, the second seal 50 is also pressed and deformed when the first wall 11 is welded to the current collecting member 30, and is always in a stressed state. In this way, the second sealing member 50 can cooperate with the first sealing member 40 to neutralize the welding stress generated at the welding region 104, and can also cooperate with the first sealing member 40 to seal the welding region 104 having a ring shape, thereby preventing the electrolytic medium from entering the welding region 104.

In some embodiments, the first seal 40 and the second seal 50 may be provided as fluoroelastomer rings.

According to the battery cell 100 of the embodiment of the application, by arranging the second sealing member 50 and arranging the first protruding portion 32 to surround the second sealing member 50, the second sealing member 50 and the first sealing member 40 respectively surround the inner side and the outer side of the annular first protruding portion 32, so that the second sealing member 50 is matched with the first sealing member 40 to seal the annular welding zone 104, and the liquid leakage prevention performance of the battery cell 100 is further improved.

According to an embodiment of the first aspect of the present application, the first wall 11 includes a second body portion 111 and a second protrusion portion 112, the second protrusion portion 112 protrudes from a surface of the second body portion 111 facing the first body portion 31; first projecting portion 32 and second projecting portion 112 abut, are welded, and form welding region 104; the first seal 40 is sandwiched between the first body portion 31 and the second projection 112.

The second body portion 111 is used to form a sealed space in cooperation with other portions of the case 10 to seal the electrode assembly 20 and the electrolyte.

The second projection 112 is used for disposing a pole, and constitutes the welding region 104 together with the first projection 32. By providing the second projecting portion 112 projecting from the surface of the second body portion 111 facing the first body portion 31, abutting contact and welding of the first projecting portion 32 with the second projecting portion 112 are facilitated.

In some embodiments of the present application, an orthographic projection of the first protrusion 32 onto the first wall 11 may be completely located on the second protrusion 112, and at the same time, an orthographic projection of the first sealing member 40 onto the first wall may be completely located on the second protrusion 112, so that both ends of the first sealing member 40 are respectively abutted against the first body portion 31 and the second protrusion 112, so as to reduce a dimension of the first sealing member 40 in a direction from the first wall 11 to the current collecting member 30, and improve reliability.

According to the battery cell 100 of the embodiment of the application, the second protruding portion 112 protrudes from the surface of the second body portion 111 facing the first body portion 31, the first protruding portion 32 abuts against the second protruding portion 112, and the welding region 104 is formed by welding, and the arrangement of the second protruding portion 112 is beneficial to the arrangement of the welding seam.

According to one embodiment of the first aspect of the present application, the first wall 11 is formed with a second recess 113 at a position opposite to the second projection 112, the second recess 113 being recessed with respect to a surface of the second body portion 111 facing away from the current collecting member 30.

The second concave portion 113 is disposed at a position corresponding to the second protruding portion 112, which is the same as the first concave portion 33, so that the thickness of the second protruding portion 112 can be reduced, and further the subsequent welding power can be greatly reduced, thereby further improving the welding stability.

In some embodiments, the second protrusion 112 may be formed by stamping, so as to form the second protrusion 112 and the second recess 113 simultaneously in a single process.

According to the battery cell 100 of the embodiment of the application, by providing the second concave portion 113, the thickness of the welding region 104 can be reduced, so as to reduce the welding power of the subsequent welding, and further improve the reliability of the battery cell 100.

According to one embodiment of the first aspect of the present application, the housing 10 comprises a case having an opening and an end cap for covering the opening; the end cap is the first wall 11.

The housing has an opening, and it is possible to implement the housing with an opening at one end and an end cap covering the opening to form a sealed space. In this case, the first wall 11 may be an end cap, and/or a bottom wall of the housing opposite the end cap.

In some embodiments, the housing may also have two openings at two ends, and the number of the end caps is two, and the two end caps cover the openings at two ends respectively.

According to the single battery 100 of the embodiment of the application, the end cover is set as the first wall 11, that is, the second protruding portion 112 is set on one side of the end cover facing the current collecting member 30, so that the second protruding portion 112 is in abutting contact with the current collecting member 30 at the welding track, the subsequent welding process is facilitated, the occurrence of welding cracks is avoided, and the liquid leakage prevention performance of the single battery 100 is further improved.

The application also provides a battery, which comprises the battery cell provided by any embodiment of the first aspect of the application.

The present application further proposes an electrical device comprising a battery as provided in any of the embodiments of the second aspect of the present application, the battery being adapted to provide electrical energy.

According to one embodiment of the present application, as shown in fig. 3 to 7, the present application proposes a battery cell 100, the battery cell 100 including a case 10, an electrode assembly 20, a current collecting member 30, a first seal member 40, and a second seal member 50.

Wherein the housing 10 comprises a first wall 11; the electrode assembly 20 is disposed in the case 10 and has tabs 21; the current collecting member 30 is received in the case 10 and electrically connected to the tab 21, and the current collecting member 30 is welded to the first wall 11 and forms a welding region 104.

The first seal member 40 is sandwiched between the first wall 11 and the current collecting member 30 and surrounds the weld zone 104. The first sealing member 40 is used to support the first wall 11 and the current collecting member 30, so as to alleviate uneven welding stress caused by different materials of the first sealing member 40 and the current collecting member 30 and reduce the possibility of welding cracks.

The current collecting member 30 includes a first body portion 31 and a first protrusion portion 32, the first protrusion portion 32 protrudes from a surface of the first body portion 31 facing the first wall 11, and in the present embodiment, the cross section of the first protrusion portion 32 has a ring shape.

The first projection 32 is disposed around the second seal 50, and the second seal 50 is sandwiched between the first body portion 31 and the first wall 11. In this way, during subsequent welding, the first sealing member 40 and the second sealing member 50 are deformed by the pressing of the first wall 11 and the current collecting member 30, and are always in a stressed state. In this way, the second sealing member 50 can cooperate with the first sealing member 40 to neutralize the welding stress generated at the welding region 104, and can also cooperate with the first sealing member 40 to seal the welding region 104 having a ring shape, thereby preventing the electrolytic medium from entering the welding region 104.

Meanwhile, the second sealing member 50 and the first sealing member 40 respectively surround the inner side and the outer side of the annular first protruding portion 32, so that the second sealing member 50 cooperates with the first sealing member 40 to seal the annular welding region 104, and the liquid leakage prevention performance of the battery cell 100 is further improved.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner 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 (10)

1. A battery cell, comprising:

a housing comprising a first wall;

an electrode assembly disposed within the case and having tabs;

a current collecting member received in the housing and electrically connected to the tab, the current collecting member being welded to the first wall and forming a weld zone; and

a first seal clamped between the first wall and the current collecting member and surrounding the weld zone.

2. The battery cell as recited in claim 1, wherein the current collecting member includes a first body portion and a first protrusion portion protruding from a surface of the first body portion facing the first wall;

the first projection is welded to the first wall and forms the weld zone;

the first seal is disposed around the first projection and sandwiched between the first body portion and the first wall.

3. The battery cell as recited in claim 2, wherein the current collecting member is formed with a first recess at a position corresponding to the first projection, the first recess being recessed with respect to a surface of the first body portion facing away from the first wall.

4. The battery cell as recited in claim 2 wherein the first protrusion is annular in cross-section.

5. The battery cell as recited in claim 4 further comprising a second seal, the first projection disposed around the second seal, the second seal sandwiched between the first body portion and the first wall.

6. The battery cell as recited in claim 2, wherein the first wall includes a second body portion and a second protruding portion protruding from a surface of the second body portion facing the first body portion;

the first protruding part and the second protruding part are abutted, welded and form the welding area;

the first seal is sandwiched between the first body portion and the second projection.

7. The battery cell as recited in claim 6 wherein the first wall is formed with a second recess at a location opposite the second projection, the second recess being recessed relative to a surface of the second body portion facing away from the current collecting member.

8. The battery cell as recited in claim 1 wherein the housing comprises a shell having an opening and an end cap for covering the opening;

the end cap is the first wall.

9. A battery comprising a cell according to any one of claims 1 to 8.

10. An electrical device comprising a battery according to claim 9 for providing electrical energy.

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