CN219067004U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The application provides a battery monomer, battery and consumer relates to battery technology field. The battery cell comprises a shell, an electrode terminal and a first blocking piece; the electrode terminal is arranged on the wall part of the shell, and the groove side wall of the accommodating groove of the electrode terminal comprises a first welding surface; the first sealing piece is at least partially accommodated in the accommodating groove, the first sealing piece comprises a second welding surface, a welding gap is formed between the second welding surface and the first welding surface, and a welding part formed by welding the first sealing piece and the electrode terminal is at least partially positioned in the welding gap. Because the welding part does not exceed the first surface, when the converging part is welded with the first surface, the welding part can not interfere with the converging part, so that the converging part and the first surface form a stable connection relationship, and the stability of the output electric energy of the battery with the battery cell is improved.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Under the large environment pursuing energy conservation and emission reduction, the battery is widely applied to electric equipment such as mobile phones, computers and electric automobiles, provides electric energy for the electric equipment, and has important significance for the electric equipment to execute related functions due to the stability of the battery for supplying power to the electric equipment. Therefore, how to improve the stability of battery power supply is a problem to be solved in the technical field of the art.

Disclosure of Invention

The embodiment of the application provides a battery monomer, battery and consumer to improve battery power supply's stability.

In a first aspect, embodiments of the present application provide a battery cell including a housing, an electrode terminal, and a first seal; the housing includes a wall portion; the electrode terminal is arranged on the wall part, an accommodating groove is formed in the surface, deviating from the inside of the battery cell, of the electrode terminal along the thickness direction of the wall part, and the groove side wall of the accommodating groove comprises a first welding surface; the first sealing member is at least partially accommodated in the accommodating groove, the first sealing member comprises a second welding surface, a welding gap is formed between the second welding surface and the first welding surface, the first sealing member is welded with the electrode terminal and forms a welding part, and the welding part is connected with the first welding surface and the second welding surface and is at least partially positioned in the welding gap.

In the above technical scheme, the groove side wall of the accommodation groove accommodating the first blocking member comprises a first welding surface, the first blocking member is provided with a second welding surface, the first blocking member is welded with the electrode terminal and forms a welding part, the welding part is connected with the first welding surface and the second welding surface and is at least partially positioned in the welding gap, then the welding part can not extend out of the welding gap along the direction deviating from the inside of the battery cell or extend out of the welding gap along the direction deviating from the inside of the battery cell, the size of the part is smaller, and then the converging part is connected with the first blocking member so as to realize the electric connection between the battery cell.

In some embodiments of the first aspect of the present application, the first sealing member includes a first surface, the first surface being a surface of the first sealing member furthest from an inside of the battery cell in a thickness direction of the wall portion, and the welding portion does not exceed the first surface.

In the above technical scheme, the welding part does not exceed the first surface, and then the welding part is connected to the first surface of the first blocking piece so as to realize the condition of electric connection between the battery monomers, and because the welding part does not exceed the first surface, when the welding part is connected with the first surface (such as welding), the welding part can not interfere with the welding part, so that the welding part and the first surface form a stable connection relationship, and a stable electric connection relationship is formed between the first blocking piece and the welding part, thereby being beneficial to improving the stability of the output electric energy of the battery with the battery monomers.

In some embodiments of the first aspect of the present application, the welding gap is gradually increased in a direction away from the inside of the battery cell in a thickness direction of the wall portion.

In the above technical scheme, on the thickness direction of wall portion, the welding clearance increases gradually along deviating from the inside direction of battery monomer, then along the thickness direction of wall portion, and the size that the welding clearance is close to the one end of first surface is great, provides great space for welder to in the convenience welder gets into the welding clearance, the welding of being convenient for.

In some embodiments of the first aspect of the present application, along a thickness direction of the wall portion, the electrode terminal has a second surface farthest from an inside of the battery cell, the receiving groove is recessed from the second surface toward a direction close to the inside of the battery cell, and the first welding surface is disposed at an obtuse angle with the second surface.

In the above technical scheme, the first welding surface and the second surface are arranged at an obtuse angle, and the accommodating groove forms a larger notch near the second surface, so that the first blocking piece can enter the accommodating groove from the notch of the accommodating groove on the second surface.

In some embodiments of the first aspect of the present application, and the included angle between the first welding surface and the second surface is theta, so that the theta is more than or equal to 110 degrees and less than or equal to 160 degrees.

In the above technical solution, if θ is too small, forming a larger notch in the receiving groove near the second surface is not preferable for the size of the electrode terminal of the actual product, and if θ is too large, the receiving groove near the second surface may form a larger notch to facilitate the first sealing member to enter the receiving groove, but may cause the electrode terminal to affect the structural strength due to the too large notch. Therefore, the angle theta is more than or equal to 110 degrees and less than or equal to 160 degrees, the notch of the containing groove close to the second surface is larger, the first blocking piece can conveniently enter the containing groove, and the structural strength of the electrode terminal can meet the actual requirement.

In some embodiments of the first aspect of the present application, the first welding surface is connected to the second surface.

In the above technical scheme, the first welding surface is connected to the second surface, so that the welding gap extends from the second surface to the interior close to the battery cell, and the welding is more convenient.

In some embodiments of the first aspect of the present application, the first blocking member includes a first surface, the first surface being a surface of the first blocking member furthest from an inside of the battery cell in a thickness direction of the wall portion, the first surface being flush with the second surface.

In the above technical scheme, the first surface and the second surface are flush, so that the dimension of the integral structure formed by the electrode terminal and the first blocking piece along the thickness direction of the wall part is reduced, and the dimension of the battery cell along the thickness direction of the wall part is reduced.

In some embodiments of the first aspect of the present application, the first welding surface is a first conical surface, and a large end of the first welding surface is further away from the inside of the battery cell than a small end of the first welding surface along a thickness direction of the wall portion.

In the above technical scheme, the first welding surface is first conical surface, and the big end of first welding surface is farther away from the inside of battery monomer than the tip of first welding surface for the holding tank is close to the size of the notch of one side that electrode terminal deviates from the inside of battery monomer great, and the first shutoff piece of being convenient for gets into the holding tank.

In some embodiments of the first aspect of the present application, the first conical surface is a conical surface.

Among the above-mentioned technical scheme, first conical surface is the circular conical surface for processing is comparatively easy, and the in-process that first shutoff piece got into the holding tank, and the circular conical surface is the same along its circumference, then the relative holding tank's of first shutoff piece positioning accuracy requirement is not high, and first shutoff piece and electrode terminal assembly of being convenient for improves assembly efficiency.

In some embodiments of the first aspect of the present application, the first sealing member includes a first surface, the first surface is a surface of the first sealing member furthest from the inside of the battery cell along the thickness direction of the wall portion, and the second welding surface is disposed at an obtuse angle with the first surface.

In the above technical scheme, the second welding surface is arranged at an obtuse angle with the first surface, so that a larger welding gap with a larger opening is formed on one side of the inner part deviating from the battery cell, and the welding gun is convenient to enter the welding gap, and the electrode terminal and the first plugging piece are convenient to weld.

In some embodiments of the first aspect of the present application, the second welding surface is connected to the first surface.

In the above technical scheme, the second welding face is connected to the first surface for the welding gap extends from the first surface to the direction that is close to the inside of the battery cell, so that the welding is more convenient.

In some embodiments of the first aspect of the present application, the second welding surface is a second conical surface, and a small end of the second welding surface is further away from the inside of the battery cell than a large end of the second welding surface along a thickness direction of the wall portion.

In the above technical scheme, the second welding surface is a second conical surface, and the small end of the second welding surface is farther away from the inside of the battery monomer than the large end of the second welding surface, so that a welding gap with a larger opening is formed, and the electrode terminal and the first blocking piece are convenient to weld.

In some embodiments of the first aspect of the present application, the first welding surface is a first conical surface, and a large end of the first welding surface is farther from the interior of the battery cell than a small end of the first welding surface along a thickness direction of the wall portion; the first plugging piece further comprises a third conical surface, the third conical surface is opposite to the first conical surface, and the third conical surface is connected to the large end of the second conical surface.

In the above technical scheme, the first welding surface is first conical surface, and the big end of first welding surface is farther from the inside of battery monomer than the tip of first welding surface, and the part of second conical surface and first conical surface forms the welding clearance, and on the thickness direction of wall portion, this welding clearance increases gradually along the direction that deviates from the inside of battery monomer, and then the size that the welding clearance is close to the one end of first surface is great, provides great space for welder to in the convenient welder gets into the welding clearance, convenient welding. The third conical surface and the first conical surface are oppositely arranged, so that the shape of the first plugging piece is more fit with the shape of the accommodating groove, and the assembly is convenient.

In some embodiments of the first aspect of the present application, the second conical surface is a conical surface; and/or the third conical surface is a conical surface.

In the technical scheme, in the actual production process, the conical surface is easier to process, and the second conical surface and/or the third conical surface are conical surfaces, so that the first plugging piece enters the accommodating groove, and the conical surfaces have the same structure along the circumferential direction of the first plugging piece, so that the positioning accuracy requirement of the first plugging piece relative to the accommodating groove is low, the first plugging piece and the electrode terminal are convenient to assemble, and the assembly efficiency is improved.

In an embodiment of the first aspect of the present application, the first blocking member further includes a first side surface connected to the large end of the second welding surface; the groove side wall of the accommodating groove further comprises a first side wall surface, the first side wall surface is closer to the inside of the battery cell relative to the first welding surface along the thickness direction of the wall part, and the first side wall surface is connected to one end of the first welding surface, which is close to the inside of the battery cell; the first side wall surface is arranged opposite to the first side surface, and the first side wall surface and the first side surface are cylindrical surfaces extending along the thickness direction of the wall portion.

In the technical scheme, the first side wall surface and the first side surface are cylindrical surfaces extending along the thickness direction of the wall part, and the cylindrical surfaces are easier to process.

In some embodiments of the first aspect of the present application, the maximum dimension of the welding gap is L along the thickness direction of the wall portion, and 0.1 mm+.l+.0.7 mm is satisfied.

In the above technical scheme, if L is greater than 0.1mm, the size of the welding gap is smaller along the thickness direction of the wall portion, so that the size of the welding portion in the thickness direction of the wall portion is smaller in order to prevent the welding portion from exceeding the first surface along the thickness direction of the wall portion, and the welding strength may be insufficient, if L is greater than 0.7mm, the size of the welding gap is larger along the thickness direction of the wall portion, and the welding difficulty is increased. Therefore, 0.1 mm.ltoreq.L.ltoreq.0.7 mm for the size of the welded portion can satisfy the welding strength requirement to the electrode terminal and the first sealing member, and makes the welding difficulty smaller.

In some embodiments of the first aspect of the present application, the first blocking member includes a first surface, which is a surface of the first blocking member furthest from the inside of the battery cell in the thickness direction of the wall portion, and is further provided with a groove disposed around an axis parallel to the thickness direction of the wall portion.

In the technical scheme, the groove can release welding stress in the welding process of the electrode terminal and the first plugging piece, improve welding quality and relieve deformation of the first plugging piece and the electrode terminal in the welding process.

In some embodiments of the first aspect of the present application, the accommodating groove is a stepped groove, the accommodating groove includes a first groove section and a second groove section that are connected, the first groove section is farther away from the inside of the battery cell than the second groove section, at least a portion of the first blocking member is accommodated in the first groove section, and the first welding surface is at least a portion of a groove side wall of the first groove section.

Among the above-mentioned technical scheme, the holding tank is the ladder groove, not only can reduce the size of electrode terminal along the thickness direction of wall portion, makes things convenient for electrode terminal and the inside utmost point ear welding of battery monomer, can also alleviate electrode terminal's weight to alleviate the free weight of battery.

In some embodiments of the first aspect of the present application, the first blocking member includes a body portion and an extension portion connected to each other, the body portion is accommodated in the first groove section and abuts against a groove bottom wall of the first groove section, the extension portion extends from the body portion into the second groove section, and the second welding surface is at least a portion of an outer peripheral surface of the body portion.

According to the technical scheme, the body part is contained in the first groove section and props against the groove bottom wall of the first groove section, so that the first blocking piece can be limited to move in the direction of being close to the inside of the battery cell in the thickness direction of the wall part, and the converging part and the first blocking piece are convenient to electrically connect. The extension part extends into the second groove section from the body part, and forms positioning fit from the second groove section, so that the first blocking piece and the electrode terminal can keep stable relative position.

In some embodiments of the first aspect of the present application, the extension portion includes a second side surface and a third surface closest to an inside of the battery cell in a thickness direction of the wall portion, the second side surface and the third surface being connected by a chamfer surface.

In the above technical scheme, the third surface and the second side are connected through the chamfer, and the arrangement of the chamfer not only can eliminate burrs at the end part of the extension part, but also can play a role in guiding in the process that the first blocking piece enters the accommodating groove so that the first blocking piece smoothly enters the accommodating groove.

In some embodiments of the first aspect of the present application, the groove sidewall of the second groove section is disposed at a distance from the outer peripheral surface of the extension.

In the above technical scheme, the groove side wall of the second groove section is arranged at intervals with the outer peripheral surface of the extension part, so that the first blocking piece and the electrode terminal are convenient to assemble.

In some embodiments of the first aspect of the present application, the distance between the groove sidewall of the second groove section and the outer circumferential surface of the extension is h,0.03mm ∈h ∈0.1mm.

In the above technical scheme, if h is less than 0.03mm, the distance between the groove side wall of the second groove section and the outer peripheral surface of the extension part is too small to control, and the machining precision of the first blocking piece and the electrode terminal is required to be higher, and the machining difficulty is higher, if h is more than 0.1mm, the distance between the groove side wall of the second groove section and the outer peripheral surface of the extension part is too large, and in the welding process of the first blocking piece and the electrode terminal, larger displacement is easy to occur to one side, so that welding is uneven, and welding quality is influenced. Therefore, h is more than or equal to 0.03mm and less than or equal to 0.1mm, so that the distance between the groove side wall of the second groove section and the outer peripheral surface of the extension part is in a range convenient to control, and the space for the first plugging piece to move in the second groove section is smaller in the welding process of the electrode terminal and the first plugging piece, thereby improving the welding uniformity and being beneficial to improving the welding quality.

In some embodiments of the first aspect of the present application, the dimension of the body portion is n along the thickness direction of the wall portion, satisfying 0.7mm n.ltoreq.1.5 mm.

In the above technical scheme, if n is less than 0.7mm, the strength of the body portion is insufficient and cannot meet the practical use requirement, and if n is more than 1.5mm, the dimension of the body portion along the thickness direction of the wall portion is too large, so that the dimension of the battery cell is increased. Therefore, n is more than or equal to 0.7mm and less than or equal to 1.5mm, the dimension of the battery monomer along the thickness direction of the wall part is within a reasonable range, and the structural strength of the body part can be ensured.

In some embodiments of the first aspect of the present application, the electrode terminal is provided with a liquid injection hole that communicates the receiving groove and the inside of the battery cell.

Among the above-mentioned technical scheme, annotate the liquid hole setting in electrode terminal for processing is more convenient, can also avoid annotating the structural strength that the liquid hole setting influences the shell on the shell.

In some embodiments of the first aspect of the present application, the battery cell further includes a second blocking member, at least a portion of the second blocking member being inserted into the liquid injection hole, so as to block the liquid injection hole.

Among the above-mentioned technical scheme, the second shutoff piece shutoff annotates the liquid hole, can reduce the risk of battery monomer weeping, can also reduce the risk that the welding slag falls into battery monomer inside from annotating the liquid hole in first shutoff piece and the electrode terminal welding process. The second blocking piece can also play a certain heat insulation role, so that the damage of high temperature to the internal structure and substances of the battery cell in the welding process of the first blocking piece and the electrode terminal is reduced.

In some embodiments of the first aspect of the present application, the second blocking member includes a blocking portion and a limiting portion, the blocking portion is inserted into the liquid injection hole, the limiting portion is connected to one end of the blocking portion and is located in the accommodating groove, and the limiting portion is used for propping against a groove bottom wall of the accommodating groove.

In the technical scheme, the limiting part of the second blocking piece is propped against the bottom wall of the accommodating groove, so that the second blocking piece can move towards the inside of the battery monomer, and the risk that the second blocking piece falls into the inside of the battery monomer is reduced.

In some embodiments of the first aspect of the present application, the first blocking member is provided with a relief portion for receiving a portion of the second blocking member.

In the above technical scheme, the setting of dodging the portion can reduce the risk that second shutoff piece and first shutoff piece interfere. The relief portion accommodates a portion of the second blocking member, i.e., a portion of the second blocking member is embedded in the first blocking member, which is advantageous in reducing the size of the overall structure formed by the first blocking member and the second blocking member.

In a second aspect, embodiments of the present application further provide a battery, including the battery cell provided in the embodiment of the first aspect.

In the above technical solution, the welded portion between the electrode terminal of the battery monomer and the first sealing member in the embodiment of the first aspect does not exceed the first surface of the first sealing member, so that when the bus member is connected (such as welded) with the first surface, the welded portion does not interfere with the bus member, so that a stable connection relationship is formed between the bus member and the first surface, and a stable electrical connection relationship is formed between the first sealing member and the bus member, which is favorable for improving the stability of the output electric energy of the battery.

In a third aspect, embodiments of the present application further provide an electrical device, including the battery provided by the embodiments of the second aspect.

In the above technical scheme, the battery provided by the embodiment of the second aspect can stably output electric energy, so that the electric equipment can stably work.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a prior art welding of a first closure member and a bus member;

FIG. 2 is a schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 3 is an exploded view of a battery provided in some embodiments of the present application;

FIG. 4 is an exploded view of a battery cell provided in some embodiments of the present application;

FIG. 5 is a schematic view of a wall portion, electrode terminal and first seal member provided in some embodiments of the present application;

FIG. 6 is an enlarged view at A in FIG. 5;

fig. 7 is a schematic view of a structure of the electrode terminal and the first sealing member of fig. 5 after welding;

FIG. 8 is an enlarged view at B in FIG. 7;

fig. 9 is a schematic structural view of an electrode terminal according to some embodiments of the present application;

fig. 10 is a schematic structural view of an electrode terminal and a first sealing member after welding according to other embodiments of the present application;

FIG. 11 is an enlarged view of FIG. 10 at C;

fig. 12 is a cross-sectional view of an electrode terminal provided in some embodiments of the present application;

FIG. 13 is a schematic view of an electrode terminal and a first seal member after welding according to further embodiments of the present application;

fig. 14 is a schematic view of an electrode terminal and a first sealing member after welding according to further embodiments of the present application;

FIG. 15 is a cross-sectional view of a first closure provided in some embodiments of the present application;

FIG. 16 is a cross-sectional view of a first closure provided in further embodiments of the present application;

FIG. 17 is a schematic view of an electrode terminal and a first seal member after welding according to still other embodiments of the present application;

fig. 18 is an enlarged view of D in fig. 17;

FIG. 19 is a schematic view of an electrode terminal and a first seal provided in further embodiments of the present application after welding;

FIG. 20 is an enlarged view at E in FIG. 19;

fig. 21 is a schematic view of an electrode terminal and a first block member provided in still further embodiments of the present application after welding;

fig. 22 is an enlarged view of F in fig. 21;

fig. 23 is a schematic view of an assembled electrode terminal and first block member provided in accordance with further embodiments of the present application;

fig. 24 is an enlarged view at G in fig. 23;

fig. 25 is a schematic view of an electrode terminal and first seal provided in accordance with further embodiments of the present application;

fig. 26 is a schematic structural view of an electrode terminal and a first sealing member according to still other embodiments of the present disclosure;

fig. 27 is a schematic structural view of an electrode terminal and a first sealing member according to still other embodiments of the present application after being mated.

Icon: 1000-vehicle; 100-cell; 10-a box body; 11-a first part; 12-a second part; 20-battery cells; 21-a housing; 211', 211-wall; 2111-mounting holes; 212-a housing; 2121-opening; 213-end caps; 22', 22-electrode terminals; 221', 221-receiving slots; 2211—a first welding surface; 2212—a first side wall; 2213—a first groove segment; 2214-a second trough section; 222-a first abutment; 223-a second abutment; 224-a connection; 225-an annular clamping groove; 226-a second surface; 227—a first transition surface; 228-filling holes; 23-insulating member; 30', 30-first closure; 31', 31-first surface; 32-a second welding surface; 33-a second transition surface; 34-a third taper; 35-a first side; 36-grooves; 361-first segment; 362-second section; 37-a body portion; 38-an extension; 381-a second side; 382-a third surface; 383-chamfer faces; 39-avoidance; 40-welding gap; 50', 50-welds; a 60-electrode assembly; 61-electrode lugs; 70-a second closure; 71-a blocking part; 72-a limiting part; 200-a controller; 300-motor; x-thickness direction of wall; y1-first intersection; y2-second intersection; y3-third intersection; y4-fourth intersection; 400' -confluence part.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put in use of the product of the application, or the orientation or positional relationship that is conventionally understood by those skilled in the art, merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the increasing field of application of the power battery 100, the market demand thereof is increasing.

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, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The term "plurality" as used herein refers to more than two (including two).

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 by the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited thereto.

In embodiments where the battery includes a plurality of cells, the plurality of cells are connected in series, parallel, or a series-parallel connection by the bus bar, the series-parallel connection meaning that there is both series and parallel connection among the plurality of cells.

The battery cell 20' includes a case 21', an electrode terminal 22', and an electrode assembly 60', the electrode assembly 60' being received in the case 21', the electrode terminal 22' being provided at a wall portion 211' of the case 21', the electrode terminal 22' being for electrical connection with the electrode assembly 60 '. The bus bar 400' is electrically connected with the electrode terminals 22' of the battery cells 20' to realize series, parallel, or series-parallel connection of the plurality of battery cells 20.

As shown in fig. 1, the bus member 400 'is not generally directly connected to the electrode terminal 22', but is directly connected to the first block member 30 'by welding the first block member 30' to the electrode terminal 22', thereby achieving electrical connection between the electrode terminal 22' and the bus member 400 'through the first block member 30'. In order to reduce the size of the overall structure formed by the electrode terminal 22' and the first blocking member 30', the surface of the electrode terminal 22' facing away from the inside of the battery cell 20' is provided with a receiving groove 221' in the thickness direction X of the wall portion, at least a portion of the first blocking member 30' is received in the receiving groove 221', and the first surface 31' of the first blocking member 30' facing away from the inside of the battery cell 20' in the thickness direction X of the wall portion is used for welding with the bus member 400', thereby achieving electrical connection.

The inventors have found that, as shown in fig. 1, the welding portion 50' is formed after the welding of the first sealing member 30' and the electrode terminal 22', the welding portion 50' protrudes from the first surface 31' of the first sealing member 30', and when the bus member 400' is welded to the first surface 31', the bus member 400' may abut against a side of the bus member 400' facing the first sealing member 30', which affects the welding quality between the bus member 400' and the first sealing member 30', and may cause a cold joint between the bus member 400' and the first surface 31', thereby making an electrical connection between the first sealing member 30' and the bus member 400' unstable or even ineffective.

Based on the above-mentioned considerations, in order to alleviate the problem that the bus member and the first surface may be cold welded due to the protrusion of the welded portion formed by welding the electrode terminal and the first block member from the first surface of the first block member, the inventors have conducted intensive studies to design a battery cell in which the groove side wall of the receiving groove provided on the surface of the electrode terminal facing away from the inside of the battery cell includes a first welded surface in the thickness direction of the wall portion of the case; the first sealing piece comprises a second welding surface, a welding gap is formed between the second welding surface and the first welding surface, the first sealing piece is welded with the electrode terminal and forms a welding part, and the welding part is connected with the first welding surface and the second welding surface and is at least partially positioned in the welding gap.

The groove side wall of the accommodating groove for accommodating the first blocking member comprises a first welding surface, the first blocking member is provided with a second welding surface, the first blocking member is welded with the electrode terminal and forms a welding part, the welding part is connected with the first welding surface and the second welding surface and is at least partially positioned in the welding gap, the welding part can not extend out of the welding gap along the direction deviating from the inside of the battery cell or extend out of the welding gap along the direction deviating from the inside of the battery cell, the bus part is connected with the first blocking member to realize the electric connection between the battery cells, and under the condition that the welding part does not exceed the first surface, the degree of the welding part not exceeding the welding gap or exceeding the welding gap is small when the bus part is connected with the first blocking member (such as welding), the interference problem of the welding part and the bus part is facilitated to be alleviated, the stable connection relation is facilitated to be formed between the bus part and the first blocking member, and the battery cell output electric energy stability is facilitated to be improved.

The battery cell disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system with the electric equipment can be composed of the battery monomer, the battery and the like, and therefore stability of electric energy output of the battery is improved.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

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

Referring to fig. 2, fig. 2 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

Referring to fig. 3, fig. 3 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 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 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second part 12 may have a hollow structure having one end opened to form a receiving cavity for receiving the battery cell 20, the first part 11 may have a plate-shaped structure, and the first part 11 is covered on the opening side of the second part 12, so 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 also be hollow structures each having one side open to form a receiving chamber for receiving the battery cell 20, the open side of the first portion 11 being closed to the open side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may also include other structures, for example, the battery 100 may include a bus member (not shown in fig. 2) for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

As shown in fig. 4-8, in some embodiments, the battery cell 20 includes a housing 21, an electrode terminal 22, and a first seal 30; the housing 21 includes a wall portion 211; the electrode terminal 22 is arranged on the wall 211, the surface of the electrode terminal 22, which is away from the inside of the battery cell 20 along the thickness direction X of the wall, is provided with a containing groove 221, and the groove side wall of the containing groove 221 comprises a first welding surface 2211; the first blocking member 30 is at least partially received in the receiving groove 221, the first blocking member 30 includes a second welding surface 32, a welding gap 40 is formed between the second welding surface 32 and the first welding surface 2211, the first blocking member 30 is welded to the electrode terminal 22, and a welding portion 50 is formed, and the welding portion 50 connects the first welding surface 2211 and the second welding surface 32 and is at least partially located in the welding gap 40.

As shown in fig. 4, the case 21 includes a case 212 and an end cap 213, one end of the case 212 having an opening 2121, and the end cap 213 for closing the opening 2121 of the case 212 such that the end cap 213 and the case 212 together form an accommodating space accommodating the electrode assembly 60. Without limitation, the shape of the end cap 213 may be adapted to the shape of the housing 212 to fit the housing 212. Optionally, the end cover 213 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cover 213 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved.

The case 212 is an assembly for mating with the end cap 213 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 60, electrolyte, and other components. Housing 212 and end cap 213 may be separate components and an opening 2121 may be provided in housing 212, with end cap 213 covering opening 2121 at opening 2121 to create the interior environment for cell 20. It is also possible to integrate the end cap 213 with the housing 212, but specifically, the end cap 213 and the housing 212 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 212, the end cap 213 is then put into place with the housing 212. The housing 212 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 212 may be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 212 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

The electrode assembly 60 is a component in which electrochemical reactions occur in the battery cells 20. One or more electrode assemblies 60 may be contained within housing 212. The electrode assembly 60 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the electrode assembly 60, and the portions of the positive and negative electrode sheets having no active material constitute the tabs 61, respectively. The positive electrode tab 61 and the negative electrode tab 61 may be located at one end of the main body portion together or at both ends of the main body portion. During charge and discharge of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 61 is connected to the electrode terminal 22 to form a current loop.

The wall 211 where the electrode terminal 22 is provided may be an end cap 213 or a wall of the case 212. Fig. 4 shows a case where the electrode terminal 22 is provided to the end cap 213, that is, the end cap 213 is a wall portion 211 where the electrode terminal 22 is provided.

The electrode terminal 22 is a functional member. The electrode terminals 22 may be used to be electrically connected with the electrode assembly 60 received in the case 21 for outputting or inputting electric power of the battery cell 20.

In an embodiment in which the wall portion 211 of the electrode terminal 22 is provided as the end cap 213, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further provided on the end cap 213. The material of the end cap 213 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, an insulator 23 may also be provided on the inside of the end cap 213, and the insulator 23 may be used to isolate the electrical connection 224 within the housing 212 from the end cap 213 to reduce the risk of shorting. By way of example, the insulator 23 may be plastic, rubber, or the like.

As shown in fig. 4, 5, and 7, the wall portion 211 is provided with mounting holes 2111, and the mounting holes 2111 penetrate both sides of the wall portion 211 in the thickness direction X of the wall portion. The shape of the mounting hole 2111 may be various, such as a circular hole, a square hole, a tapered hole, etc. for the mounting hole 2111. Fig. 4, 5, and 7 show a case where the mounting hole 2111 is a circular hole.

The electrode terminal 22 is inserted into the mounting hole 2111. The electrode terminal 22 includes a first abutting portion 222, a second abutting portion 223, and a connecting portion 224, and both ends of the connecting portion 224 are connected to the first abutting portion 222 and the second abutting portion 223, respectively, in the thickness direction X of the wall portion. The first abutting portion 222 extends around the outer periphery of the connecting portion 224 and protrudes out of the outer periphery of the connecting portion 224, the second abutting portion 223 extends around the outer periphery of the connecting portion 224 and protrudes out of the outer periphery of the connecting portion 224, the first abutting portion 222, the second abutting portion 223 and the connecting portion 224 together form an annular clamping groove 225, and the wall portion 211 is clamped in the annular clamping groove 225. The connecting portion 224 is disposed in the mounting hole 2111 in a penetrating manner, the first abutting portion 222 and the second abutting portion 223 are respectively located at two sides of the wall portion 211, and the first abutting portion 222 and the second abutting portion 223 respectively abut against two opposite surfaces of the wall portion 211, so that a limiting effect is achieved, and the electrode terminal 22 is stably disposed on the wall portion 211. The structural shape of the connection portion 224 may be matched with that of the mounting hole 2111, for example, the mounting hole 2111 is a circular hole, the connection portion 224 may be a cylindrical structure, the mounting hole 2111 is a conical hole, and the connection portion 224 may be a conical structure. The second abutting portion 223 is located on a side of the wall portion 211 facing the inside of the battery cell 20, and the first abutting portion 222 is located on a side of the wall portion 211 facing away from the inside of the battery cell 20. There are various structural forms of the first abutting portion 222 and the second abutting portion 223, for example, the first abutting portion 222 has a circular ring structure, and the second abutting portion 223 has a circular disk structure. The first abutting portion 222 and the second abutting portion 223 may be identical or different in structure. Fig. 3 shows a case where the first abutting portion 222 has a circular ring structure, the second abutting portion 223 has a circular disk structure, and the outer diameter of the first abutting portion 222 is smaller than the outer diameter of the second abutting portion 223.

The first abutting portion 222, the second abutting portion 223 and the connecting portion 224 may be separately arranged and then connected into a whole structure, for example, connected into a whole structure by means of welding connection, adhesive connection, etc. The first abutting portion 222, the second abutting portion 223 and the connecting portion 224 may be integrally formed, for example, by punching, pouring or the like. The first abutting portion 222 may be a burring structure formed by a portion of the connecting portion 224 extending out of the mounting hole 2111.

The wall portion 211 may be provided with one electrode terminal 22 in an insulating manner, one of the positive electrode tab and the negative electrode tab of the electrode assembly 60 may be electrically connected to the electrode terminal 22, and the other of the positive electrode tab and the negative electrode tab may be electrically connected to the case 212.

In other embodiments, two electrode terminals 22 may be provided on the wall portion 211 in an insulating manner, and the two electrode terminals 22 are electrically connected to the positive electrode tab and the negative electrode tab of the electrode assembly 60, respectively.

The receiving groove 221 is recessed from the surface of the electrode terminal 22 farthest from the inside of the battery cell 20 toward the inside of the battery cell 20 in the thickness direction X of the wall portion, and the receiving groove 221 may extend to one side of the surface of the electrode terminal 22 facing the inside of the battery cell 20, that is, in the thickness direction X of the wall portion, the receiving groove 221 penetrates opposite sides of the electrode terminal 22 to form a through hole. As shown in fig. 6 and 7, the receiving groove 221 may not extend to the side of the surface of the electrode terminal 22 facing the inside of the battery cell 20.

The groove side wall of the accommodation groove 221 is a wall surface other than the groove bottom wall of the accommodation groove 221. The bottom wall of the accommodation groove 221 is a wall surface in the thickness direction X of the vertical wall portion of the accommodation groove 221. The first welding surface 2211 is at least a portion of a groove side wall of the receiving groove 221.

The first blocking member 30 may be entirely accommodated in the accommodating groove 221, or may be only partially accommodated in the accommodating groove 221. The first blocking member 30 includes a first surface 31, the first surface 31 being a surface of the first blocking member 30 farthest from the inside of the battery cell 20 in the thickness direction X of the wall portion, and the first surface 31 may be located inside the receiving groove 221 or may be located outside the receiving groove 221.

The first surface 31 may also be flush with the surface of the electrode terminal 22 furthest from the inside of the battery cell 20 in the thickness direction X of the wall portion. The bus bar member (not shown in fig. 4-8) may be in welded or abutting contact with the first surface 31 to make electrical connection between the bus bar member and the first closure member 30. The projection of the second welding surface 32 in the plane parallel to the thickness direction X of the wall portion and the projection of the first welding surface 2211 in the plane parallel to the direction of the wall portion 211 overlap at least partially, and a welding gap 40 is formed between the area where the projections of the first welding surface 2211 and the second welding surface 32 overlap. The electrode terminal 22 and the first sealing member 30 are welded in the welding gap 40. The welding portion 50 may be entirely located in the welding gap 40, and the welding portion 50 may be partially accommodated in the welding gap 40, and the other portion extends out of the welding gap 40 in the thickness direction X of the wall portion in the inner direction away from the battery cell 20.

As shown in fig. 9, in some embodiments, the first welding surface 2211 may be a closed ring surface disposed around the axis of the thickness direction X of the parallel wall portion, the second welding surface 32 may be a closed ring surface disposed around the axis of the thickness direction X of the parallel wall portion, and the welding gap 40 may be an annular gap around the axis of the thickness direction X of the parallel wall portion, and the welding portion 50 may be an annular structure located within the welding gap 40 and driven in conformity with the extension of the welding gap 40 so that the welding portion 50 not only can connect the electrode terminal 22 and the first sealing member 30, but also functions as a seal between the first sealing member 30 and the electrode terminal 22.

The groove side wall of the accommodating groove 221 accommodating the first blocking member 30 includes a first welding surface 2211, the first blocking member 30 has a second welding surface 32, the first blocking member 30 is welded to the electrode terminal 22 and forms a welding portion 50, the welding portion 50 connects the first welding surface 2211 and the second welding surface 32 and is at least partially located in the welding gap 40, the welding portion 50 may not extend out of the welding gap 40 in a direction away from the inside of the battery cell 20 or extend out of the welding gap 40 in a direction away from the inside of the battery cell 20, and the bus member is connected to the first blocking member 30 to achieve electrical connection between the battery cells 20, when the bus member is connected (such as welded connection) to the first blocking member 30, since the welding portion 50 does not exceed the welding gap 40 or exceeds the welding gap 40 to a small extent, the problem of interference between the welding portion 50 and the bus member is advantageously alleviated, so that the bus member and the first blocking member 30 form a stable connection relationship, thereby the bus member 30 and the bus member form a stable electrical connection relationship, which is advantageous for improving the stability of the output electrical energy of the battery cell 100.

In some embodiments, the first blocking member 30 includes a first surface 31, the first surface 31 being a surface of the first blocking member 30 furthest from the inside of the battery cell 20 in the thickness direction X of the wall portion, and the welded portion 50 does not exceed the first surface 31.

The welding gap 40 has a depth in the thickness direction X of the wall portion, and the welding portion 50 is located in the welding gap 40 such that the welding portion 50 does not protrude beyond the first surface 31 in the thickness direction X of the wall portion. The end of the welding part 50 farthest from the inside of the battery cell 20 may be flush with the first surface 31 in the thickness direction X of the wall part, or the end of the welding part 50 farthest from the inside of the battery cell 20 may be closer to the inside of the battery cell 20 than the first surface 31 in the thickness direction X of the wall part such that the welding part 50 does not protrude beyond the first surface 31 in a direction away from the battery cell 20.

Under the condition that the welding part 50 does not exceed the first surface 31, and then the bus member is connected to the first surface 31 of the first blocking member 30 to realize electrical connection between the battery cells 20, since the welding part 50 does not exceed the first surface 31, when the bus member is connected (such as welded) with the first surface 31, the welding part 50 does not interfere with the bus member, so that the bus member and the first surface 31 form a stable connection relationship, and a stable electrical connection relationship is formed between the first blocking member 30 and the bus member, which is beneficial to improving the stability of the output electrical energy of the battery with the battery cells 20.

In some embodiments, the welding gap 40 is of an equal-sized structure, and the size of the welding gap 40 refers to the distance between the first welding surface 2211 and the second welding surface 32 along the direction perpendicular to the thickness direction X of the wall portion, and the size of any position of the welding gap 40 is the same, so that the size of the welding portion 50 is conveniently controlled, thereby facilitating welding and improving welding quality.

As shown in fig. 6 and 8, in other embodiments, the welding gap 40 gradually increases in a direction away from the inside of the battery cell 20 in the thickness direction X of the wall portion.

That is, in the thickness direction X of the wall portion, the welding gap 40 has a variable-sized structure, and the distance between the first welding surface 2211 and the second welding surface 32 gradually increases in a direction away from the inside of the battery cell 20, so that the size of the end of the welding gap 40 away from the inside of the battery cell 20 is larger than the size of the end of the welding gap 40 close to the inside of the battery cell 20.

Therefore, in the thickness direction X of the wall portion, the welding gap 40 gradually increases in a direction away from the inside of the battery cell 20, so that the size of the end of the welding gap 40, which is close to the first surface 31, is larger in the thickness direction X of the wall portion, and a larger space is provided for the welding gun, thereby facilitating the welding gun to enter the welding gap 40 and facilitating welding.

As shown in fig. 6, 7, 8, and 9, in some embodiments, the electrode terminal 22 has a second surface 226 farthest from the inside of the battery cell 20 in the thickness direction X of the wall portion, the receiving groove 221 is recessed from the second surface 226 toward the inside of the battery cell 20, and the first welding surface 2211 is disposed at an obtuse angle to the second surface 226.

The receiving groove 221 is recessed from the second surface 226 in a direction approaching the inside of the battery cell 20, and the receiving groove 221 forms a notch on the second surface 226. The second surface 226 and the first surface 31 may be coplanar, and in such an embodiment, the first blocking member 30 may be entirely received within the receiving groove 221. Alternatively, the second surface 226 is closer to the inside of the battery cell 20 than the first surface 31 is to the first surface 31 in the thickness direction X of the wall portion, and in this embodiment, a portion of the first blocking member 30 is accommodated in the accommodation groove 221. Alternatively, the first surface 31 may be closer to the inside of the battery cell 20 than the second surface 226 in the thickness direction X of the wall portion, and in such an embodiment, the first blocking member 30 may be entirely accommodated in the accommodating groove 221. The first surface 31 and the second surface 226 are shown coplanar in fig. 6, 7, 8.

As shown in fig. 8, a straight line parallel to the thickness direction X of the wall portion is defined as a reference straight line, an intersection line of a plane of the reference straight line and the first welding surface 2211 is a first intersection line Y1, and an intersection line of a plane of the reference straight line and the second surface 226 is a second intersection line Y2. The first welding surface 2211 is disposed at an obtuse angle with respect to the second surface 226, and it is understood that each of the first intersecting line Y1 and the second intersecting line Y2 is disposed at an obtuse angle.

The angle between the first welding surface 2211 and the second surface 226 is defined as θ, that is, the angle between the first intersecting line Y1 and the second intersecting line Y2 is defined as θ, and 90 ° < θ < 180 °.

The first welding surface 2211 and the second surface 226 are disposed at an obtuse angle, and the receiving groove 221 forms a larger notch near the second surface 226, so that the first blocking member 30 enters the receiving groove 221 from the notch of the receiving groove 221 on the second surface 226.

In an embodiment where the first and second surfaces 2211 and 226 are disposed at an obtuse angle, the first and second surfaces 2211 and 226 have an angle θ, satisfying 110 θ+.ltoreq.160 °.

For example, θ may be 110 °, 115 °, 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, 155 °, and the like.

If θ is too small, it is not preferable for the size of the electrode terminal 22 of the actual product that the receiving groove 221 is formed with a larger notch near the second surface 226, and if θ is too large, the receiving groove 221 may be formed with a larger notch near the second surface 226 to facilitate the entry of the first blocking member 30 into the receiving groove 221, but may cause the electrode terminal 22 to affect the structural strength due to the excessive grooving. Therefore, 110 θ+.ltoreq.160 may not only make the notch of the accommodation groove 221 near the second surface 226 larger, facilitate the entry of the first blocking member 30 into the accommodation groove 221, but also make the structural strength of the electrode terminal 22 meet the practical requirements.

As shown in fig. 8, 9, in some embodiments, the first bonding surface 2211 is connected to the second surface 226.

It is appreciated that the first bonding surface 2211 is directly connected to the second surface 226.

The first welding surface 2211 is connected to the second surface 226 such that the welding gap 40 extends from the second surface 226 toward the inside near the battery cell 20, making welding more convenient.

In other embodiments, the first welding surface 2211 may be indirectly connected to the second surface 226, as shown in fig. 10 and 11, where the first welding surface 2211 and the second surface 226 are in transitional connection through a first transitional surface 227, and the first transitional surface 227 may be a chamfer surface or a circular arc chamfer surface 383. Fig. 11 shows a case where the first transition surface 227 is a circular arc chamfer surface 383.

As shown in fig. 11, in some embodiments, the first blocking member 30 includes a first surface 31, the first surface 31 being a surface of the first blocking member 30 furthest from the interior of the battery cell in the thickness direction X of the wall portion, the first surface 31 being flush with the second surface 226.

It will be appreciated that the first surface 31 and the second surface 226 are coplanar or that the first surface 31 and the second surface 226 are at the same distance from the same location inside the battery cell 20 in the thickness direction X of the wall portion.

The first surface 31 and the second surface 226 are flush, which is advantageous in reducing the size of the entire structure of the electrode terminal 22 and the first blocking member 30 in the thickness direction X of the wall portion, thereby reducing the size of the battery cell 20 in the thickness direction X of the wall portion.

In other embodiments, the first surface 31 may be closer to the interior of the battery cell 20 than the second surface 226, or the second surface 226 may be closer to the interior of the battery cell 20 than the first surface 31.

In some embodiments, the first welding surface 2211 is a first tapered surface, and the large end of the first welding surface 2211 is farther from the inside of the battery cell 20 than the small end of the first welding surface 2211 in the thickness direction X of the wall portion.

The extending direction of the axis of the first tapered surface may be parallel to the thickness direction X of the wall portion.

The first welding surface 2211 is a first conical surface, and the large end of the first welding surface 2211 is farther away from the interior of the battery cell 20 than the small end of the first welding surface 2211, so that the size of a notch of the side, close to the electrode terminal 22, of the accommodating groove 221, facing away from the interior of the battery cell 20 is larger, and the first blocking member 30 can conveniently enter the accommodating groove 221.

In order to gradually increase the welding gap 40 in the thickness direction X of the wall portion in a direction away from the inside of the battery cell 20, in an embodiment in which the first welding surface 2211 is a first tapered surface, as shown in fig. 12 and 13, the second welding surface 32 may be a second tapered surface, and the small end of the second welding surface 32 may be further away from the inside of the battery cell 20 than the large end of the second welding surface 32 in the thickness direction X of the wall portion, and the welding gap 40 may be triangular in cross section at the positions corresponding to the first tapered surface and the second tapered surface.

Of course, in the embodiment in which the first welding surface 2211 is a first conical surface, as shown in fig. 12 and 14, the second welding surface 32 may be a cylindrical surface, and a welding gap 40 gradually increasing in a direction away from the inside of the battery cell 20 may be formed at a position corresponding to the second welding surface 32 in the form of the first conical surface and the cylindrical surface, and the cross section of the welding gap 40 may be a right triangle.

In some embodiments, the first taper may be a pyramid. In this embodiment, the large end and the small end of the first conical surface are polygonal, for example, the large end and the small end of the first conical surface are triangular, quadrilateral, pentagonal, hexagonal, etc.

In other embodiments, the first conical surface is a conical surface. In such an embodiment, the major and minor ends of the first tapered surface are rounded, and the major end of the first tapered surface has a larger diameter than the minor end of the first tapered surface. The axis of the conical surface may or may not coincide with the axis of the mounting hole 2111.

The first conical surface is the conical surface for processing is comparatively easy, and the in-process that first shutoff piece 30 got into holding tank 221, the conical surface along its circumference structure the same, then the relative holding tank 221 of first shutoff piece 30 positioning accuracy requirement is not high, the assembly of first shutoff piece 30 and electrode terminal 22 of being convenient for and improvement assembly efficiency.

In other embodiments, the first welding surface 2211 may also be a cylindrical surface, and the axis of the cylindrical surface extends in a direction parallel to the thickness direction X of the wall portion.

As shown in fig. 15, in some embodiments, the first blocking member 30 includes a first surface 31, the first surface 31 being a surface of the first blocking member 30 furthest from the inside of the battery cell 20 in the thickness direction X of the wall portion, and the second welding surface 32 is disposed at an obtuse angle to the first surface 31.

The intersection line of the plane in which the reference line is located and the second welding surface 32 is a third intersection line Y3, and the intersection line of the plane in which the reference line is located and the first surface 31 is a fourth intersection line Y4. The second welding surface 32 is disposed at an obtuse angle with respect to the first surface 31, and it is understood that the third intersecting line Y3 and the fourth intersecting line Y4 are disposed at an obtuse angle.

The angle between the second welding surface 32 and the first surface 31 is defined as a, i.e. the angle between the third intersection line Y3 and the fourth intersection line Y4 is defined as a, and is also 90 ° < a < 180 °. For example, α may be 100 °, 105 °, 110 °, 120 °, 130 °, 140 °, 150 °, 160 °, etc.

The second welding surface 32 and the first surface 31 are arranged at an obtuse angle, so that a welding gap 40 with a larger opening is formed on one side of the inner part facing away from the battery cell 20, and a welding gun can conveniently enter the welding gap 40, and the electrode terminal 22 and the first blocking piece 30 can conveniently be welded.

In other embodiments, the second welding surface 32 and the first surface 31 may also be arranged vertically. I.e. α=90°.

As shown in fig. 15, in some embodiments, the second welding surface 32 is connected to the first surface 31.

It will be appreciated that the second welding surface 32 is directly connected to the first surface 31.

The second welding surface 32 is connected to the first surface 31 such that the welding gap 40 extends from the first surface 31 in a direction approaching the inside of the battery cell 20, making welding more convenient.

In other embodiments, the second welding surface 32 may be indirectly connected to the first surface 31, as shown in fig. 16, where the second welding surface 32 and the first surface 31 are in transitional connection through a second transitional surface 33, and the second transitional surface 33 may be a chamfer bevel or a circular arc chamfer 383. Fig. 16 shows a case where the second transition surface 33 is a circular arc chamfer surface.

As shown in fig. 15 and 16, in some embodiments, the second welding surface 32 is a second conical surface, and the small end of the second welding surface 32 is farther from the inside of the battery cell 20 than the large end of the second welding surface 32 in the thickness direction X of the wall portion.

The extending direction of the axis of the second taper surface may be parallel to the thickness direction X of the wall portion.

The second conical surface may be a pyramid surface or a conical surface.

In the embodiment where the second conical surface is a pyramid, the major and minor ends of the second conical surface are polygonal, such as triangular, quadrilateral, pentagonal, hexagonal, etc.

In the embodiment of the second conical surface, the large end and the small end of the second conical surface are both round, and the diameter of the large end of the second conical surface is larger than the diameter of the small end of the second conical surface. The axis of the conical surface may or may not coincide with the axis of the mounting hole 2111.

The second welding surface 32 is a second conical surface, and the small end of the second welding surface 32 is farther from the inside of the battery cell 20 than the large end of the second welding surface 32, which is advantageous to form a welding gap 40 with a larger opening, thereby facilitating welding of the electrode terminal 22 and the first blocking member 30.

In order to gradually increase the welding gap 40 in the thickness direction X of the wall portion in a direction away from the inside of the battery cell 20, as shown in fig. 17 and 18, in the embodiment in which the second welding surface 32 is a second tapered surface, the first welding surface 2211 may be a cylindrical surface, and a welding gap 40 gradually increasing in the direction away from the inside of the battery cell 20 is formed at a position corresponding to the first welding surface 2211 in the form of the second tapered surface and the cylindrical surface, and the cross section of the welding gap 40 is a right triangle.

Of course, as shown in fig. 19 and 20, in the embodiment in which the second welding surface 32 is a second conical surface, the first welding surface 2211 may be a first conical surface, and the large end of the first conical surface is farther from the inside of the battery cell 20 than the small end of the first conical surface along the thickness direction X of the wall portion, so that a welding gap 40 gradually increasing in a direction away from the inside of the battery cell 20 is formed at the corresponding position of the first conical surface and the second conical surface, and the cross section of the welding gap 40 is triangular.

As shown in fig. 20, in the embodiment in which the second welding surface 32 is a second tapered surface, the first welding surface 2211 is a first tapered surface, and the large end of the first welding surface 2211 is farther from the inside of the battery cell 20 than the small end of the first welding surface 2211 in the thickness direction X of the wall portion; the first occluding component 30 further includes a third conical surface 34, the third conical surface 34 being disposed opposite the first conical surface, the third conical surface 34 being connected to the major end of the second conical surface.

The large end of the third tapered surface 34 is farther from the inside of the battery cell 20 than the small end. The large end of the third tapered surface 34 and the large end of the second tapered surface are directly connected.

A portion of the first tapered surface is disposed in correspondence with the second weld to form a weld gap 40, and another portion of the first tapered surface is disposed opposite the third tapered surface 34. The third taper 34 has an angle θ with the second surface 226 ₁ ，θ ₁ And θ may be the same or different. Shown in FIG. 20, θ ₁ In the case of =θ, so that the third taper 34 can be better matched with the first taper.

The first welding surface 2211 is a first conical surface, the large end of the first welding surface 2211 is farther away from the inside of the battery unit 20 than the small end of the first welding surface 2211, the second conical surface and the first conical surface form a welding gap 40, in the thickness direction X of the wall portion, the welding gap 40 gradually increases along the direction deviating from the inside of the battery unit 20, and then the size of one end of the welding gap 40, which is close to the first surface 31, is larger, so that a larger space is provided for a welding gun, and the welding gun can conveniently enter the welding gap 40, and welding is convenient. The third conical surface 34 and the first conical surface are arranged oppositely, so that the shape of the first plugging piece 30 is more fit with the shape of the accommodating groove 221, and the assembly is convenient.

In some embodiments, the second conical surface is a conical surface; and/or the third conical surface 34 is a conical surface.

Only one of the second tapered surface and the third tapered surface 34 may be a tapered surface, such as the second tapered surface being a tapered surface, the third tapered surface 34 being a tapered surface, or the third tapered surface 34 being a tapered surface, the second tapered surface being a tapered surface. The second and third conical surfaces 34 may each be conical surfaces.

In the actual production process, the conical surface is easier to process, and the second conical surface and/or the third conical surface 34 are conical surfaces, so that in the process that the first plugging piece 30 enters the accommodating groove 221, the conical surfaces have the same structure along the circumferential direction, the positioning accuracy requirement of the first plugging piece 30 relative to the accommodating groove 221 is low, and the first plugging piece 30 and the electrode terminal 22 are convenient to assemble and the assembly efficiency is improved.

As shown in fig. 21 and 22, in the embodiment in which the second welding surface 32 is a second conical surface, the first blocking member 30 further includes a first side surface 35, and the first side surface 35 is connected to the large end of the second welding surface 32; the groove side wall of the accommodating groove 221 further includes a first side wall surface 2212, the first side wall surface 2212 is closer to the inside of the battery cell 20 than the first welding surface 2211 is, and the first side wall surface 2212 is connected to one end of the first welding surface 2211 close to the inside of the battery cell 20; the first side wall 2212 is disposed opposite to the first side surface 35, and the first side wall 2212 and the first side surface 35 are each cylindrical surfaces extending in the thickness direction X of the wall portion.

Along the thickness direction X of the wall portion, the first side wall surface 2212 and the first welding surface 2211 are adjacent to one end of the interior of the battery cell 20. In an embodiment in which the first welding surface 2211 is a first tapered surface, the first side wall surface 2212 is directly connected to the small end of the first welding surface 2211. In an embodiment where the first tapered surface is a conical surface, the diameter of the first side wall 2212 and the diameter of the small end of the first tapered surface may be the same.

The first side wall 2212 and the first side wall 35 may be bonded to each other, or a gap may be present.

The first side wall surface 2212 and the first side surface 35 are cylindrical surfaces extending in the thickness direction X of the wall portion, and the cylindrical surfaces are more easily processed.

As shown in FIGS. 20 and 22, in some embodiments, the maximum dimension of the weld gap 40 is L in the thickness direction X of the wall portion, satisfying 0.1 mm.ltoreq.L.ltoreq.0.7 mm.

In the embodiment in which the first blocking member 30 is entirely accommodated in the accommodation groove 221 in the thickness direction X of the wall portion, the largest dimension L of the welding gap 40 in the thickness direction X of the wall portion is the distance between the end of the second welding surface 32 farthest from the inside of the battery cell 20 and the end closest to the inside of the battery cell 20 in the thickness direction X of the wall portion.

In the embodiment in which a portion of the first blocking member 30 is received in the receiving groove 221 in the thickness direction X of the wall, the largest dimension L of the welding gap 40 in the thickness direction X of the wall is the distance between the end of the first welding surface 2211 furthest from the inside of the battery cell 20 in the thickness direction X of the wall and the end of the second welding surface 32 closest to the inside of the battery cell 20 in the thickness direction X of the wall. In such an embodiment, the welding part 50 may protrude beyond the second surface 226 of the electrode terminal 22 in the thickness direction X of the wall part, but cannot protrude beyond the first surface 31 of the first sealing member 30.

L may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, etc.

If L > 0.1mm, the size of the welding gap 40 is small in the thickness direction X of the wall portion, and in order to prevent the welded portion 50 from exceeding the first surface 31 in the thickness direction X of the wall portion, the size of the welded portion 50 in the thickness direction X of the wall portion is also small, which may cause insufficient welding strength, and if L > 0.7mm, the size of the welding gap 40 is large in the thickness direction X of the wall portion, and the welding difficulty increases. Therefore, 0.1 mm.ltoreq.L.ltoreq.0.7 mm, so that the size of the welded portion 50 can satisfy the welding strength requirements for the electrode terminal 22 and the first sealing member 30, and the welding difficulty is made smaller.

As shown in fig. 19 to 22, in some embodiments, the first blocking member 30 includes a first surface 31, the first surface 31 being a surface of the first blocking member 30 furthest from the inside of the battery cell 20 in the thickness direction X of the wall portion, the first surface 31 being further provided with a groove 36, the groove 36 being disposed around an axis parallel to the thickness direction X of the wall portion.

The groove 36 is an annular groove provided around the axis of the thickness direction X of the parallel wall portion. The cross-section of the recess 36 may be U-shaped.

The provision of the grooves 36 can release welding stress during welding of the electrode terminal 22 and the first sealing member 30, improve welding quality, alleviate deformation of the first sealing member 30 and the electrode terminal 22 during welding, improve a state of welding stress in the circumferential direction of the first sealing member 30, and reduce risk of occurrence of welding cracks.

As shown in fig. 23 and 24, the groove 36 is a stepped groove, and the groove 36 includes a first segment 361 and a second segment 362, and the first segment 361 is closer to the first surface 31 than the second segment 362 in the thickness direction X of the wall portion. The first segment 361 extends to the second welding surface 32. The second section 362 is recessed from the groove bottom wall of the first section 361 in a direction away from the first surface 31.

Referring to fig. 12, 19, 21, and 23 in combination, in some embodiments, the receiving groove 221 is a stepped groove, the receiving groove 221 includes a first groove section 2213 and a second groove section 2214 connected to each other, the first groove section 2213 is farther from the inside of the battery cell 20 than the second groove section 2214, at least a portion of the first blocking member 30 is received in the first groove section 2213, and the first welding surface 2211 is at least a portion of a groove sidewall of the first groove section 2213.

One end of the first groove segment 2213 extends to the second surface 226 of the electrode terminal 22 in the thickness direction X of the wall portion. The second groove segment 2214 is recessed from the groove bottom wall of the first groove segment 2213 toward the inside near the battery cell 20. The structures of the first groove segment 2213 and the second groove segment 2214 may be the same or different, and the first groove segment 2213 and the second groove segment 2214 may be circular grooves, square grooves, etc.

The first blocking member 30 may be accommodated only in the first groove section 2213. The first block 30 may also be partially received in the first segment 2213 with another portion extending into the second segment 2214.

As shown in fig. 19 and 20, the groove side wall of the first groove segment 2213 is the first welding surface 2211, that is, the first welding surface 2211 is the entire first groove side wall. As shown in fig. 21 and 22, in the embodiment in which the groove side wall of the accommodation groove 221 includes the first welding surface 2211 and the first side wall surface 2212, the first welding surface 2211 and the first side wall surface 2212 together form the groove side wall of the first groove section 2213, and then the first welding surface 2211 is a part of the groove side wall of the first groove section 2213.

The receiving groove 221 is a stepped groove, which not only reduces the size of the electrode terminal 22 in the thickness direction X of the wall portion, facilitates welding of the electrode terminal 22 and the tab 61 inside the battery cell 20, but also reduces the weight of the electrode terminal 22, thereby reducing the weight of the battery cell 20.

In other embodiments, the receiving groove 221 may also include only the first groove segment 2213.

With continued reference to fig. 19 and 21, in some embodiments, the first sealing member 30 includes a body portion 37 and an extension portion 38 connected to each other, the body portion 37 is received in the first groove segment 2213 and abuts against a groove bottom wall of the first groove segment 2213, the extension portion 38 extends from the body portion 37 into the second groove segment 2214, and the second welding surface 32 is at least a portion of an outer peripheral surface of the body portion 37.

The first surface 31 is the surface of the body portion 37 furthest from the inside of the battery cell 20 in the thickness direction X of the wall portion.

As shown in fig. 19 and 20, in the embodiment in which the first block piece 30 includes the second welding surface 32 and the third tapered surface 34, the second welding surface 32 and the third tapered surface 34 together form the outer peripheral surface of the body portion 37. As shown in fig. 21 and 22, in the embodiment in which the first block piece 30 includes the second welding surface 32 and the first side surface 35, the second welding surface 32 and the first side surface 35 together form the outer peripheral surface of the body portion 37.

The body 37 is accommodated in the first groove segment 2213 and abuts against the groove bottom wall of the first groove segment 2213, so that the first blocking member 30 can be limited to move further in the direction of approaching the inside of the battery cell 20 in the thickness direction X of the wall, and the current collecting member and the first blocking member 30 can be electrically connected. The extension 38 extends from the body 37 into the second groove segment 2214, and forms a positioning fit from the second groove segment 2214, which is advantageous for maintaining a stable relative positional relationship of the first blocking member 30 and the electrode terminal 22.

In other embodiments, the first blocking member 30 may include only a main body portion that is received in the first groove segment 2213.

Referring to fig. 15, 16, 19, 21, and 23 in combination, in some embodiments, the extension 38 includes a second side 381 and a third surface 382 closest to the interior of the battery cell 20 in the thickness direction X of the wall, the second side 381 and the third surface 382 being connected by a chamfer 383.

The second side 381 is disposed about an axis parallel to the thickness direction X of the wall portion. The first side 35 is disposed opposite the slot side wall of the second slot segment 2214. The second side 381 may be a surface matching the groove sidewall of the second groove segment 2214, for example, the groove sidewall of the second groove segment 2214 is a cylindrical surface, and then the second side 381 may be a cylindrical surface; for another example, the groove sidewall of the second groove segment 2214 may be prismatic, and the second side 381 may be prismatic, and illustratively, the groove sidewall of the second groove segment 2214 may be hexagonal, and the second side 381 may be hexagonal.

The third surface 382 is also the surface of the second blocking member 70 closest to the inside of the battery cell 20 in the thickness direction X of the wall portion.

The chamfer surface 383 may be a chamfer surface or a bevel surface. 15. The chamfer surface 383 is shown as a chamfer bevel in fig. 16, 19, 21, and 23.

The third surface 382 and the second side surface 381 are connected by a chamfer surface 383, and the chamfer surface 383 is provided not only to eliminate burrs at the end of the extension portion 38, but also to play a guiding role in the process of the first blocking member 30 entering the receiving groove 221 so that the first blocking member 30 smoothly enters the receiving groove 221.

As shown in fig. 25, in some embodiments, the groove sidewall of the second groove segment 2214 is spaced from the outer circumferential surface of the extension 38.

The second groove segment 2214 is in clearance fit with the extension 38, and a distance exists between the groove side wall of the second groove segment 2214 and the outer peripheral surface of the extension 38. In this embodiment, there is a distance between the groove sidewall of the second groove segment 2214 and the second side 381 of the extension 38.

The groove side wall of the second groove segment 2214 is spaced apart from the outer circumferential surface of the extension 38, facilitating the assembly of the first blocking member 30 and the electrode terminal 22.

With continued reference to FIG. 25, in some embodiments, the distance between the groove sidewall of the second groove segment 2214 and the outer circumferential surface of the extension 38 is h,0.03 mm.ltoreq.h.ltoreq.0.1 mm.

The distance h between the groove side wall of the second groove segment 2214 and the outer peripheral surface of the extension 38 is also the distance between the groove side wall of the second groove segment 2214 and the second side surface 381 of the extension 38. h may be 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

If h is less than 0.03mm, the distance between the groove side wall of the second groove segment 2214 and the outer circumferential surface of the extension portion 38 is too small to control, and a higher requirement is put on the machining precision of the first blocking member 30 and the electrode terminal 22, and the machining difficulty is higher, if h is more than 0.1mm, the distance between the groove side wall of the second groove segment 2214 and the outer circumferential surface of the extension portion 38 is too large, and a larger displacement easily occurs to one side in the welding process of the first blocking member 30 and the electrode terminal 22, so that the welding is uneven, and the welding quality is affected. Therefore, 0.03 mm.ltoreq.h.ltoreq.0.1 mm, so that the distance between the groove side wall of the second groove segment 2214 and the outer circumferential surface of the extension 38 is within a range convenient to control, and also so that the space in which the first seal 30 moves in the second groove segment 2214 is small during the welding of the electrode terminal 22 and the first seal 30, thereby improving welding uniformity and being beneficial to improving welding quality.

As shown in FIG. 25, in some embodiments, the body portion 37 has a dimension n in the thickness direction X of the wall portion, satisfying 0.7 mm.ltoreq.n.ltoreq.1.5 mm.

The dimension n of the body 37 in the thickness direction X of the wall portion refers to the distance between the first surface 31 and the surface of the body 37 that abuts against the groove bottom wall of the first groove segment 2213, or the distance between the first surface 31 and the groove bottom wall of the first groove segment 2213, in the thickness direction X of the wall portion.

n may be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

If n is less than 0.7mm, the strength of the body 37 is insufficient to meet the practical use requirements, and if n is greater than 1.5mm, the dimension of the body 37 in the thickness direction X of the wall is too large, increasing the dimension of the battery cell 20. Therefore, n is 0.7mm or less and 1.5mm or less, not only can the dimension of the battery cell 20 in the thickness direction X of the wall portion be within a reasonable range, but also the structural strength of the body portion 37 can be ensured.

As shown in fig. 26, in some embodiments, the electrode terminal 22 is provided with a liquid injection hole 228, and the liquid injection hole 228 communicates between the receiving groove 221 and the inside of the battery cell 20.

In the present embodiment, the filling hole 228 is disposed at the bottom wall of the second groove segment 2214 and penetrates the bottom wall of the second groove segment 2214. In other embodiments, the injection hole 228 may be disposed on a side wall of the receiving groove 221, for example, the injection hole 228 is disposed on a side wall of the second groove segment 2214 and extends to a side of the second abutting portion 223 facing away from the connecting portion 224. The electrolyte injection hole 228 is used for allowing electrolyte to enter the housing 21, specifically, electrolyte is injected into the housing 21 from the electrolyte injection hole 228 after entering the accommodating groove 221.

The liquid injection hole 228 is formed in the electrode terminal 22, so that the processing is more convenient, and the influence of the liquid injection hole 228 on the structural strength of the housing 21 on the housing 21 can be avoided.

In the case where the welded portion 50 is of an annular structure, the first blocking member 30 can function to block the liquid injection hole 228, reducing the risk of leakage of the electrolyte or entry of external impurities into the housing 21 through the accommodation groove 221 and the liquid injection hole 228.

In other embodiments, the filling hole 228 may be disposed on the wall portion 211.

As shown in fig. 27, in some embodiments, the battery cell 20 further includes a second blocking member 70, at least a portion of the second blocking member 70 being inserted into the pour hole 228 such that the pour hole 228 is blocked.

The second blocking member 70 may be a rubber nail. The second blocking member 70 is inserted into the liquid injection hole 228, and the hole wall of the liquid injection hole 228 can deform the second blocking member 70, so that the second blocking member 70 is sealed in the liquid injection hole 228. Of course, the wall of the liquid injection hole 228 may be bonded to the surface of the second sealing member 70, and the wall of the liquid injection hole 228 may not deform the second sealing member 70.

The second blocking member 70 may be partially inserted into the pouring spout 228 or may be entirely inserted into the pouring spout 228.

The second blocking member 70 blocks the liquid injection hole 228, so that the risk of liquid leakage of the battery cell 20 can be reduced, and the risk of welding slag falling into the battery cell 20 from the liquid injection hole 228 in the welding process of the first blocking member 30 and the electrode terminal 22 can be reduced. The second blocking member 70 also serves a certain heat insulation function, reducing damage to the internal structure and materials of the battery cell 20 due to high temperature during welding of the first blocking member 30 and the electrode terminal 22.

The second blocking member 70 has various structural forms, for example, as shown in fig. 27, in some embodiments, the second blocking member 70 includes a blocking portion 71 and a limiting portion 72, the blocking portion 71 is inserted into the liquid injection hole 228, the limiting portion 72 is connected to one end of the blocking portion 71 and is located in the accommodating groove 221, and the limiting portion 72 is used to abut against a bottom wall of the accommodating groove 221.

In the embodiment in which the filling hole 228 is provided in the bottom wall of the second groove segment 2214, the limiting portion 72 abuts against the bottom wall of the second groove segment 2214 of the receiving groove 221, and the limiting portion 72 is located on the side of the bottom wall of the second groove segment 2214 away from the inside of the battery cell 20.

The limiting portion 72 of the second blocking member 70 abuts against the bottom wall of the accommodating groove 221, so that the second blocking member 70 can move towards the inside of the battery cell 20, and the risk that the second blocking member 70 falls into the inside of the battery cell 20 is reduced.

With continued reference to FIG. 27, in some embodiments, the first occluding member 30 is provided with a relief 39, the relief 39 being configured to receive a portion of the second occluding member 70.

A part of the second block piece 70 is inserted into the pouring hole 228, and a part of the second block piece 70 is positioned in the accommodation groove 221. The relief portion 39 is a relief groove provided in the first blocking member 30, and a portion of the second blocking member 70 located in the accommodation groove 221 is accommodated in the relief portion 39. In the present embodiment, the limiting portion 72 of the second blocking member 70 is accommodated in the accommodating groove 221, and the relief portion 39 is recessed from the surface of the first blocking member 30 closest to the inside of the battery cell 20 in a direction away from the inside of the battery cell 20. At least part of the stopper 72 is accommodated in the escape portion 39. The stopper portion 72 may be partially accommodated in the escape portion 39 or may be entirely accommodated in the escape portion 39. In the embodiment in which the injection hole 228 is provided in the bottom wall of the second groove segment 2214, when a part of the second stopper 70 is accommodated in the relief portion 39, the surface (third surface 382) of the first stopper 30 closest to the inside of the battery cell 20 and the bottom wall of the second groove segment 2214 may abut against each other or may be provided at a distance from each other in the thickness direction X of the wall portion.

The provision of the relief 39 reduces the risk of interference between the second blocking member 70 and the first blocking member 30. The relief 39 accommodates a portion of the second blocking member 70, i.e., a portion of the second blocking member 70 is embedded in the first blocking member 30, which facilitates reducing the size of the overall structure formed by the first blocking member 30 and the second blocking member 70.

In other embodiments, the relief 39 may not be provided on the first blocking member 30, and the surface (the third surface 382) of the first blocking member 30 closest to the inside of the battery cell 20 may be abutted against or spaced apart from the surface of the second blocking member 70 furthest from the inside of the battery cell 20 in the thickness direction X of the wall. For example, the third surface 382 of the first blocking member 30 and the surface of the stopper 72 facing away from the blocking portion 71 are disposed against or spaced apart.

The embodiment also provides a battery 100, which includes the battery cell 20 provided in any of the above embodiments.

The battery 100 may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, parallel, or series-parallel by a bus member. The bus member is welded to the first surface 31 of the first blocking member 30 of the battery cell 20.

The welding portion 50 of the electrode terminal 22 of the battery cell 20 and the first sealing member 30 in the first embodiment does not exceed the first surface 31 of the first sealing member 30, so that the welding portion 50 does not interfere with the bus member when the bus member is connected (e.g., welded) to the first surface 31, so that the bus member and the first surface 31 form a stable connection relationship, and a stable electrical connection relationship is formed between the first sealing member 30 and the bus member, which is beneficial to improving the stability of the output power of the battery 100.

The embodiment of the application also provides electric equipment, which comprises the battery 100 provided by the embodiment.

Battery 100 provides electrical power to the powered device to enable the powered device to perform its functions normally.

The battery 100 provided in the above embodiment can stably output electric energy, thereby ensuring that the electric equipment can stably work.

The present embodiment provides a cylindrical battery including a case 21, an electrode terminal 22, a first blocking member 30, an electrode assembly 60, and a second blocking member 70. The electrode terminal 22 is provided in the wall 211 of the case 21 in an insulating manner, and the electrode terminal 22 is electrically connected to the tab 61 of the electrode assembly 60. Along the thickness direction X of the wall portion, the second surface 226 of the electrode terminal 22 furthest from the inside of the battery cell 20 is provided with a receiving groove 221, the receiving groove 221 is a stepped groove, the receiving groove 221 includes a first groove section 2213 and a second groove, and the first groove section 2213 is further away from the inside of the battery cell 20 than the second groove section 2214. The first welding surface 2211 is a groove side wall of the first groove section 2213, the first welding surface 2211 is a conical surface, a large end of the first welding surface 2211 is connected with the second surface 226, and a small end of the first welding surface 2211 is connected with a groove bottom wall of the first groove section 2213. The first blocking member 30 includes a body portion 37 and an extension portion 38 connected, the body portion 37 is accommodated in the first groove segment 2213, a surface of the body portion 37 connected with the extension portion 38 abuts against a groove bottom wall of the first groove segment 2213, and the extension portion 38 extends into the second groove segment 2214. The first surface 31 of the body portion 37 farthest from the inside of the battery cell 20 is used for welding connection with the bus member in the thickness direction X of the wall portion. The outer peripheral surface of the body 37 includes a second welding surface 32 and a third conical surface 34, the second welding surface 32 and the third conical surface 34 are conical surfaces, a small end of the second welding surface 32 is directly or indirectly connected with the first surface 31, a large end of the second welding surface 32 is connected with a large end of the third conical surface 34, a welding gap 40 is formed between a part of the first welding surface 2211 and the second welding surface 32, the electrode terminal 22 and the first blocking member 30 are welded and connected to form a welding portion 50 located in the welding gap 40, the welding portion 50 is connected with the first welding surface 2211 and the second welding surface 32, the welding portion 50 does not exceed the first surface 31 in the thickness direction X of the wall portion, and another part of the first welding surface 2211 is arranged opposite to the third conical surface 34. The third surface 382 of the extension 38 facing away from the body portion 37 and the outer peripheral surface (second side surface 381) of the extension 38 are connected by a chamfer surface 383 in the thickness direction X of the wall portion. The tank bottom wall of the second tank segment 2214 is provided with a liquid injection hole 228, the plugging part 71 of the second plugging part 70 is inserted into the liquid injection hole 228, the limiting part 72 of the second plugging part 70 is connected to one end of the plugging part 71 and is positioned in the second tank segment 2214, and the limiting part 72 is propped against the tank bottom wall of the second tank segment 2214. The third surface 382 of the extension 38 is provided with the relief portion 39, and at least a portion of the stopper 72 is accommodated in the relief portion 39.

The present embodiment provides a cylindrical battery including a case 21, an electrode terminal 22, a first blocking member 30, an electrode assembly 60, and a second blocking member 70. The electrode terminal 22 is provided in the wall 211 of the case 21 in an insulating manner, and the electrode terminal 22 is electrically connected to the tab 61 of the electrode assembly 60. Along the thickness direction X of the wall portion, the second surface 226 of the electrode terminal 22 furthest from the inside of the battery cell 20 is provided with a receiving groove 221, the receiving groove 221 is a stepped groove, the receiving groove 221 includes a first groove section 2213 and a second groove, and the first groove section 2213 is further away from the inside of the battery cell 20 than the second groove section 2214. The groove side wall of the first groove segment 2213 comprises a first welding surface 2211 and a first side wall surface 2212, the first welding surface 2211 is a conical surface, the second side wall surface is a cylindrical surface, the large end of the first welding surface 2211 is connected with the second surface 226, the small end of the first welding surface 2211 is connected with the first side wall surface 2212, and one end, deviating from the first welding surface 2211, of the first side wall surface 2212 is connected with the groove bottom wall of the first groove segment 2213. The first blocking member 30 includes a body portion 37 and an extension portion 38 connected, the body portion 37 is accommodated in the first groove segment 2213, a surface of the body portion 37 connected with the extension portion 38 abuts against a groove bottom wall of the first groove segment 2213, and the extension portion 38 extends into the second groove segment 2214. The first surface 31 of the body portion 37 farthest from the inside of the battery cell 20 is used for welding connection with the bus member in the thickness direction X of the wall portion. The outer peripheral surface of the body 37 includes a second welding surface 32 and a first side surface 35, the second welding surface 32 is a conical surface, the second side surface 381 is a cylindrical surface, a small end of the second welding surface 32 is directly or indirectly connected to the first surface 31, a large end of the second welding surface 32 is connected to the first side surface 35, and the first side surface 35 and the first side wall surface 2212 are arranged opposite to each other. A welding gap 40 is formed between a portion of the first welding surface 2211 and the second welding surface 32, the electrode terminal 22 and the first sealing member 30 are welded and connected to form a welded portion 50 located in the welding gap 40, the welded portion 50 connects the first welding surface 2211 and the second welding surface 32, the welded portion 50 does not protrude beyond the first surface 31 in the thickness direction X of the wall portion, and the other portion of the first welding surface 2211 is arranged opposite to the third taper surface 34. The third surface 382 of the extension 38 facing away from the body portion 37 and the outer peripheral surface (second side surface 381) of the extension 38 are connected by a chamfer surface 383 in the thickness direction X of the wall portion. The tank bottom wall of the second tank segment 2214 is provided with a liquid injection hole 228, the plugging part 71 of the second plugging part 70 is inserted into the liquid injection hole 228, the limiting part 72 of the second plugging part 70 is connected to one end of the plugging part 71 and is positioned in the second tank segment 2214, and the limiting part 72 is propped against the tank bottom wall of the second tank segment 2214. The third surface 382 of the extension 38 is provided with the relief portion 39, and at least a portion of the stopper 72 is accommodated in the relief portion 39.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (29)

1. A battery cell, comprising:

a housing including a wall portion;

an electrode terminal arranged on the wall part, wherein an accommodating groove is formed in the surface of the electrode terminal, which is away from the inside of the battery cell along the thickness direction of the wall part, and the groove side wall of the accommodating groove comprises a first welding surface;

the first sealing piece is at least partially accommodated in the accommodating groove, the first sealing piece comprises a second welding surface, a welding gap is formed between the second welding surface and the first welding surface, the first sealing piece is welded with the electrode terminal and forms a welding part, and the welding part is connected with the first welding surface and the second welding surface and is at least partially positioned in the welding gap.

2. The battery cell as recited in claim 1, wherein the first blocking member includes a first surface, the first surface being a surface of the first blocking member furthest from an interior of the battery cell in a thickness direction of the wall portion, the welded portion not exceeding the first surface.

3. The battery cell of claim 1, wherein the weld gap increases gradually in a direction away from an interior of the battery cell in a thickness direction of the wall portion.

4. The battery cell according to claim 2, wherein the electrode terminal has a second surface farthest from the inside of the battery cell in a thickness direction of the wall portion, the receiving groove is recessed from the second surface toward a direction approaching the inside of the battery cell, and the first welding surface is disposed at an obtuse angle to the second surface.

5. The battery cell of claim 4, wherein the first weld face is angled at θ from the second surface to satisfy 110 θ+.ltoreq.160 °.

6. The battery cell of claim 4, wherein the first weld face is connected to the second surface.

7. The battery cell of claim 4, wherein the first surface is flush with the second surface.

8. A battery cell according to any one of claims 1 to 3, wherein the first welding surface is a first tapered surface, and a large end of the first welding surface is farther from the inside of the battery cell than a small end of the first welding surface in a thickness direction of the wall portion.

9. The battery cell of claim 8, wherein the first conical surface is a conical surface.

10. The battery cell of claim 1, wherein the first seal includes a first surface that is a surface of the first seal furthest from an interior of the battery cell in a thickness direction of the wall portion, and the second weld face is disposed at an obtuse angle with the first surface.

11. The battery cell of claim 10, wherein the second weld face is connected to the first surface.

12. A battery cell according to any one of claims 1 to 3, wherein the second welding surface is a second tapered surface, and a small end of the second welding surface is farther from the inside of the battery cell than a large end of the second welding surface in a thickness direction of the wall portion.

13. The battery cell of claim 12, wherein the first welding surface is a first conical surface, and a large end of the first welding surface is farther from the interior of the battery cell than a small end of the first welding surface in a thickness direction of the wall portion;

the first plugging piece further comprises a third conical surface, the third conical surface is opposite to the first conical surface, and the third conical surface is connected to the large end of the second conical surface.

14. The battery cell of claim 13, wherein the second conical surface is a conical surface; and/or the third conical surface is a conical surface.

15. The battery cell of claim 12, wherein the first seal further comprises a first side connected to the large end of the second weld face;

the groove side wall of the accommodating groove further comprises a first side wall surface, the first side wall surface is closer to the inside of the battery cell relative to the first welding surface along the thickness direction of the wall part, and the first side wall surface is connected to one end of the first welding surface, which is close to the inside of the battery cell;

the first side wall surface is arranged opposite to the first side surface, and the first side wall surface and the first side surface are cylindrical surfaces extending along the thickness direction of the wall portion.

16. A battery cell according to any one of claims 1 to 3, wherein the maximum dimension of the welding gap in the thickness direction of the wall portion is L, satisfying 0.1 mm.ltoreq.l.ltoreq.0.7 mm.

17. The battery cell according to claim 2, wherein the first surface is further provided with a groove disposed around an axis parallel to a thickness direction of the wall portion.

18. A battery cell according to any one of claims 1 to 3, wherein the receiving groove is a stepped groove, the receiving groove comprises a first groove section and a second groove section connected to each other, the first groove section is further away from the inside of the battery cell than the second groove section, at least a portion of the first blocking member is received in the first groove section, and the first welding surface is at least a portion of a groove side wall of the first groove section.

19. The battery cell of claim 18, wherein the first seal includes a body portion and an extension portion connected, the body portion being received in and against a bottom wall of the first channel segment, the extension portion extending from the body portion into the second channel segment, the second weld surface being at least a portion of an outer peripheral surface of the body portion.

20. The battery cell of claim 19, wherein the extension includes a second side surface and a third surface closest to an interior of the battery cell in a thickness direction of the wall portion, the second side surface and the third surface being connected by a chamfer.

21. The battery cell of claim 19, wherein the slot sidewall of the second slot section is spaced from the outer peripheral surface of the extension.

22. The battery cell of claim 21, wherein a distance between a groove sidewall of the second groove section and an outer peripheral surface of the extension is h,0.03mm +.0.1 mm.

23. The battery cell of claim 19, wherein the body portion has a dimension n in a thickness direction of the wall portion that satisfies 0.7mm +.n +.1.5 mm.

24. A battery cell according to any one of claims 1 to 3, wherein the electrode terminal is provided with a liquid injection hole that communicates the accommodating groove and the inside of the battery cell.

25. The battery cell of claim 24, further comprising a second plug, at least a portion of the second plug being inserted into the pour hole such that the pour hole is plugged.

26. The battery cell of claim 25, wherein the second blocking member comprises a blocking portion and a limiting portion, the blocking portion is inserted into the liquid injection hole, the limiting portion is connected to one end of the blocking portion and located in the accommodating groove, and the limiting portion is used for propping against a groove bottom wall of the accommodating groove.

27. The battery cell of claim 25, wherein the first seal member is provided with a relief portion for receiving a portion of the second seal member.

28. A battery comprising a cell according to any one of claims 1-27.

29. A powered device comprising a battery according to claim 28.

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