CN218827461U - Battery cell's shell, battery cell, battery and consumer - Google Patents

Abstract

The embodiment of the application provides a single battery shell, a single battery, a battery and electric equipment, and can effectively reduce the complexity of the process for manufacturing the battery. The housing of the battery cell includes: a side wall (310) enclosing a receiving cavity with at least one open end, wherein the receiving cavity is used for receiving an electrode assembly (400); an end wall (320) for closing the opening to seal the receiving cavity; an electrode terminal (330) disposed on the end wall (320); wherein the housing (300) is of a one-piece construction.

Description

Battery cell's shell, battery cell, battery and consumer

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

In the development of battery technology, in addition to the performance of batteries, processes for manufacturing batteries need to be considered. Therefore, how to reduce the complexity of the process for manufacturing the battery is an urgent problem to be solved in the development of the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a single battery shell, a single battery, a battery and electric equipment, and can effectively reduce the complexity of the process for manufacturing the battery.

In a first aspect, a housing for a battery cell is provided, comprising: the side wall encloses and forms a containing cavity with at least one open end, and the containing cavity is used for containing the electrode assembly; an end wall for covering the opening to seal the accommodating cavity; an electrode terminal disposed on the end wall; wherein, the shell is of an integrated structure.

The embodiment of the application, shell formula structure as an organic whole compares and sets up welded connection alone in end wall and lateral wall, and the manufacturing of formula structure is convenient, simple structure to effectively reduced the technology complexity of making the battery, and also reduced the cost of manufacture, improved production efficiency. Further, the electrode terminals are disposed on the end walls instead of the cap plates, so that a design without cap plates can be realized, not only is the weight of the battery reduced, but also the number of battery parts is reduced, and further the production cost of the battery is reduced.

In some possible implementations, the side wall encloses a receiving cavity with two open ends, and the side wall includes a first wall, and the end wall is connected to two ends of the first wall.

Above-mentioned technical scheme, when holding the chamber and being both ends opening, the end wall is connected with the both ends of the same wall of lateral wall, so, has not only made things convenient for cutting of integral type structure, has also made things convenient for the folding of follow-up end wall moreover. In addition, since the end walls are used to cover the openings, the end walls are disposed at the sides of the case before the cover, that is, the electrode terminals are disposed at the sides of the case of the battery cell. Since the sides of the housing are protruded, the electrical connection between the battery cells can be achieved using the in-line bus bar and the in-line welding technology. Compared with other bus-bar components, such as U-shaped bus-bar components, the difficulty of the welding process adopted when the in-line bus-bar components are used is greatly reduced, so that the process complexity of manufacturing the battery can be further reduced.

In some possible implementations, the first wall is the largest area wall of all the walls of the housing.

According to the technical scheme, the first wall is set to be the wall with the largest area in all the walls of the shell, so that the subsequent manufacturing processes, such as the welding of the pole lugs, are greatly facilitated.

In some possible implementations, a junction of the first wall and the end wall is provided with a score.

According to the technical scheme, the notches are arranged, so that the end wall can cover the opening conveniently after the shell and the electrode assembly are assembled, and the process complexity of manufacturing the battery is further reduced.

In some possible implementations, the size of the score is 2mm to 5mm along the second direction.

As the end walls are provided with other structural members, such as electrode terminals, in addition to the score lines. Therefore, the technical scheme sets the size of the nick to be 2mm-5mm, which facilitates the folding of the subsequent end wall and does not influence the arrangement of other structural members on the end wall.

In some possible implementations, the score has a thickness of 2mm to 5mm.

According to the technical scheme, the thickness of the nicks is set to be 2mm-5mm, so that the situation that the end walls are not turned over due to the fact that the nicks are too thin is avoided, and the problems that the end walls are broken and the process difficulty is increased due to the fact that the nicks are too thick are avoided.

In some possible implementations, the maximum thickness of the end wall is greater than the thickness of the side wall.

Since the end wall is provided with other structural members such as electrode terminals, the end wall generally has a greater assembly strength requirement than the side wall. Above-mentioned technical scheme sets up the maximum thickness of end wall for being greater than the thickness of lateral wall, so can improve the assembly strength of end wall, satisfies the assembly strength demand of end wall.

In some possible implementations, the end wall includes an edge portion and a main body portion, the edge portion is disposed around the main body portion, and a surface of the edge portion facing the accommodating cavity is recessed with respect to the main body portion in a thickness direction of the end wall and forms a step portion. Therefore, the end wall can be covered conveniently, and the process difficulty is effectively reduced.

In some possible implementations, a projected area of the edge portion occupies 5% -10% of a projected area of the end wall in a thickness direction of the end wall.

According to the technical scheme, in the thickness direction of the end wall, the projection area of the edge part is set to be 5% -10% of the projection area of the end wall, when the end wall is convenient to cover, and meanwhile after the electrode assembly is assembled, the end wall is convenient to fold and then is packaged and welded.

In some possible implementations, the side wall includes a second wall on which the seal of the unitary structure is disposed, wherein the second wall is the smallest area of the side walls.

In the above solution, on the one hand, the largest wall of the housing usually expands, and therefore the strength requirement at the seal is high. Therefore, the sealing part of the integrated structure is arranged on the second wall of the shell, so that the process difficulty of enclosing the integrated structure into the shell can be reduced. On the other hand, in the case that the sealing position is a welding seam, the welding process for welding the integrated structure into the outer shell is usually splicing welding, and the splicing welding is generally side welding, so that the welding seam is formed on the second wall of the outer shell, and the normal operation of the welding process can be ensured.

In some possible implementations, the method further includes: a connecting member disposed on the end wall, the connecting member including a first portion and a second portion, wherein a dimension of the first portion is greater than a dimension of the second portion along the first direction.

Above-mentioned technical scheme sets up the thickness through the first part with connecting elements for being greater than the thickness of second part, is about to connecting elements sets up to local thickening structure, and when electric current is great, can effectively avoid the condition that the shell is fused to guarantee the free biggest ability of overflowing of battery, and then guarantee the security performance of battery.

In a second aspect, a battery cell is provided, including: a housing of the battery cell in the first aspect or each implementation form thereof; an electrode assembly disposed within the case, the electrode assembly including a tab, the tab being electrically connected with the electrode terminal.

In some possible implementations, the tab is welded to the electrode terminal.

In a third aspect, a battery is provided, including: the battery cell of the second aspect or each implementation thereof; the box is used for accommodating the battery monomer.

In a fourth aspect, there is provided an electrical device comprising: the battery of the third aspect, wherein the battery is used for supplying electric energy to the electric device.

Drawings

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

FIG. 1 is a schematic illustration of a vehicle according to one embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a housing of a battery cell according to an embodiment of the present application.

FIG. 4 is a schematic diagram of a unitary structure according to an embodiment of the present application.

Figure 5 is a schematic view of an integrated structure provided with scores of another embodiment of the present application.

Fig. 6 isbase:Sub>A schematic cross-sectional structure view alongbase:Sub>A-base:Sub>A' of the integrated structure shown in fig. 5.

Fig. 7 is a schematic diagram of the housing obtained after the integral structure is subjected to lap welding according to the embodiment of the present application.

Fig. 8 is a schematic view of the assembly of an electrode assembly and a case according to an embodiment of the present application.

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

Detailed Description

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

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

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

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

In the embodiment of the present application, the battery cell may include a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

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

The battery cell may include an electrode assembly composed of a positive electrode tab, a negative electrode tab, and a separator, and an electrolyte. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be graphite, carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The material of the diaphragm may be polypropylene (PP), polyethylene (PE), or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology requires consideration of various design factors, such as performance parameters including energy density, cycle life, discharge capacity, and charge/discharge rate, and also requires consideration of the process for manufacturing the battery. If the process for manufacturing the battery is simple, the development of the battery is greatly promoted. However, at present, the process of manufacturing the battery is generally complicated due to the limitation of the battery structure, which severely limits the development of the battery.

In order to solve the above problems, embodiments of the present application provide a housing of a battery cell including a side wall, an end wall, and an electrode terminal. Wherein, the lateral wall encloses to close and forms the both ends open-ended and holds the chamber, holds the chamber and is used for holding electrode subassembly, and the end wall is used for covering this opening to sealed chamber of holding, electrode terminal sets up on the end wall, and shell formula structure as an organic whole. Compare and set up welded connection alone in end wall and lateral wall, the integral type structure is made conveniently, simple structure to effectively reduced the technology complexity of making the battery, and also reduced the cost of manufacture, improved production efficiency.

The technical scheme described in the embodiment of the application is suitable for various electric equipment using batteries.

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

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

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1.

In order to meet different power usage requirements, the battery may include a plurality of battery cells. The plurality of battery cells can be connected in series or in parallel or in series-parallel, and the series-parallel refers to the mixture of series connection and parallel connection. The battery may also be referred to as a battery pack. Alternatively, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted.

For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case (or a cover), the inside of the case is a hollow structure, and the plurality of battery cells 10 are accommodated in the case. As shown in fig. 2, the case may comprise two parts, herein referred to as a first part 111 and a second part 112, respectively, the first part 111 and the second part 112 snap together. The shape of the first and second portions 111 and 112 may be determined according to the shape of a combination of a plurality of battery cells 20, and the first and second portions 111 and 112 may each have one opening. For example, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the opening of the first portion 111 and the opening of the second portion 112 are oppositely disposed, and the first portion 111 and the second portion 112 are fastened to each other to form a box body having a closed chamber. Wherein the case may include a bottom plate 112a, side plates 112b, and beams. The plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in a box formed by buckling the first part 111 and the second part 112.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. Alternatively, the current conducting means can also belong to the current collecting part.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required.

The battery cell 20 may include one or more electrode assemblies, a case, and a cap plate, or may also include one or more electrode assemblies and a case. Wherein the housing is adapted to receive one or more electrode assemblies.

Each electrode assembly has a first tab and a second tab having opposite polarities. For example, when the first tab is a positive tab, the second tab is a negative tab.

Fig. 3 shows a schematic structural diagram of a housing 300 of a battery cell according to an embodiment of the present application. As shown in fig. 3, the case 300 includes a side wall 310, an end wall 320, and an electrode terminal 330, wherein the side wall 310 encloses a receiving cavity having at least one open end, the receiving cavity is used for receiving the electrode assembly 400, the end wall 320 is used for covering the opening to seal the receiving cavity, the electrode terminal is disposed on the end wall 320, and the case 300 is of a unitary structure.

End wall 320 includes a wall where side walls 310 enclose a receiving cavity that is open at one end. In the case where the side walls 310 enclose a receiving cavity that is open at both ends, as shown in fig. 3, the end wall 320 includes two walls.

For convenience of description, the embodiment of the present application will be described below by taking an example in which the side wall 310 encloses a receiving cavity with two open ends. It should be understood that the embodiments of the present application are not limited thereto.

Alternatively, end wall 320 may be the largest area of all the walls of housing 300. That is, the end walls 320 may be walls provided at both ends of the housing 300 in the height direction.

It is contemplated that the tabs may not be welded if the end wall 320 is the largest area of all the walls of the housing 300. Thus, as shown in FIG. 3, end wall 320 may be the smallest area wall of all of the walls of housing 300. That is, the end walls 320 may be walls provided at both ends of the housing 300 in the length direction.

Of course, the end walls 320 may be walls provided at both ends of the housing 300 in the width direction.

The electrode assembly 400 of the embodiment of the present application may have a laminated structure. The laminated type mainly comprises the steps that a positive pole piece and a negative pole piece are respectively cut into single pieces, a diaphragm is positioned between the positive pole piece and the negative pole piece, and the positive pole piece and the negative pole piece are sequentially and alternately stacked in the thickness direction of the positive pole piece and the negative pole piece. The electrode assembly with the structure has the advantages of small internal resistance, small cycle performance, large-multiplying-power charge and discharge and the like.

The electrode terminals 330 include positive and negative electrode terminals, and a connecting member, which may also be referred to as a current collecting member, is disposed at each of the electrode terminals 330, respectively, for electrically connecting the electrode assembly 400 and the electrode terminals 330. Specifically, the positive electrode terminal is connected to the positive electrode tab through one connecting member, and the negative electrode terminal is connected to the negative electrode tab through the other connecting member.

The shape of the housing 300 may be various shapes such as a rectangular parallelepiped or other polyhedrons. Exemplarily, as shown in fig. 3, in the embodiment of the present application, a case 300 having a rectangular parallelepiped structure is mainly described as an example.

The material of the housing 300 may be various. Such as copper, iron, aluminum, steel or aluminum alloys, and the like. If the housing 300 is made of aluminum, the housing 300 may be formed by an integrated aluminum shell structure. The integrated structure may be, for example, the structure shown in fig. 4.

The sealing portion 341 of the integrated structure may be disposed on any wall of the housing 300. By providing the sealing portion 341, a case having a hollow structure with two open ends can be formed in an integrated structure, thereby greatly facilitating the assembly of the subsequent case and the electrode assembly 400.

Illustratively, the seal 341 may be, but is not limited to, a weld, an adhesive, or the like.

Alternatively, the seal 341 may be provided on the wall having the largest area among all the walls of the housing 300.

In consideration of the fact that the seal 341 is provided on the wall having the largest area, the seal 341 is required to have high strength because the wall is generally expanded. In addition, when the sealing portion 341 is a weld, the welding process for welding the integrated structure to the housing is generally splicing welding, which is generally side welding.

Thus, in some embodiments, the side wall 310 may further include a second wall 340, and referring again to fig. 3, the seal 341 may be disposed on the second wall 340, wherein the second wall 340 is the smallest area wall of the side walls 310.

According to the technical scheme, the sealing part 341 is arranged on the wall with the smallest area in the side wall 310, so that the process difficulty of enclosing the integrated structure into the shell 300 can be reduced on one hand, and on the other hand, the normal operation of the welding process can be ensured under the condition that the sealing part 341 is a welding seam.

Note that the seal 341 of the integrated structure in the above description refers to the seal of the sidewall 310.

In some embodiments, the side wall 310 may include a first wall 311, and the end walls 320 are connected to both ends of the first wall 311.

That is, the number of the end walls 320 is two, and are respectively provided at both ends of the first wall 311. The positive electrode terminal is disposed on one of the two end walls 320, and the negative electrode terminal is disposed on the other end wall 320 of the two end walls 320.

Above-mentioned technical scheme, when holding the chamber and being both ends opening, end wall 320 is connected with the both ends of the same wall of lateral wall 310, so, has not only made things convenient for cutting of integral type structure, has also made things convenient for folding of follow-up end wall 320 moreover. In addition, since the end wall 320 is used to cover the opening, the end wall 320 is disposed at the side of the can 300 before the cover, that is, the electrode terminal 330 is disposed at the side of the can 300 of the battery cell. Since the sides of the housing 300 are protruded, the electrical connection between the battery cells can be achieved using the in-line bus bar unit and the in-line welding technique. Compared with other bus-bar components, such as U-shaped bus-bar components, the difficulty of the welding process adopted when the in-line bus-bar components are used is greatly reduced, so that the process complexity of manufacturing the battery can be further reduced.

Of course, the sidewall 310 may also include a second wall disposed opposite the first wall 311 in the first direction. One of the end walls 320 is connected to the first wall 311, the other end wall 320 of the end walls 320 is connected to the second wall,

in the embodiment of the present application, the first direction may be any direction. For example, the first direction may be a height direction of the housing 300. Alternatively, the first direction may be a height direction of the housing 300.

In some embodiments, the first wall 311 may be the largest area wall of all the walls of the housing 300.

In this embodiment, the first wall 311 is set as the largest area wall among all the walls of the housing 300, which greatly facilitates the subsequent manufacturing processes, such as the welding of the tabs.

To facilitate closing of the opening by end wall 320, in some embodiments, as shown in fig. 3 and 5, the junction of first wall 311 and end wall 320 may be provided with a notch 321.

By providing the scores 321, it is greatly facilitated that the can 300 having both ends open and the electrode assembly 400 are assembled and the end wall 320 covers the opening, thereby further reducing the complexity of the process for manufacturing the battery. Wherein the end wall 320 may be folded over to cover the opening of the receiving cavity after the case 300 having both ends open and the electrode assembly 400 are assembled.

Optionally, the connection between the end wall 320 and the first wall 311 may have a plurality of cut holes, and the plurality of cut holes may form the scores 321. The shape of the cut hole may be circular. Rectangular, etc. The cut-out hole may be a through-hole. As an example, the penetration holes may be holes opened at the connection of the end wall 320 and the first wall 311 by a laser cutting head or cutter, and are sequentially spaced at the connection and penetrate the connection in the thickness direction of the housing 300.

Alternatively, the notch 321 may be a region where the end wall 320 is connected to the first wall 311 and has a thickness smaller than that of the other portions. For example, some regions of the junction of the end wall 320 and the first wall 311 may be thinned, and the thinned regions may form the scores 321.

Optionally, the dimension L of the score 321 in the second direction may be 2mm to 5mm. For example, the dimension L of the notch 321 may be 3mm, 4mm, or the like.

Since the end wall 320 is provided with other structural members such as the electrode terminal 330 in addition to the notch 321. Therefore, the above technical solution sets the size L of the notch 321 to 2mm-5mm, which facilitates the folding of the subsequent end wall 320 and does not affect the arrangement of other structural members on the end wall 320.

Alternatively, as shown in fig. 6, the thickness D of the score 321 may be 2mm to 5mm. For example, the thickness of the score 321 may be 3mm or 4mm.

According to the technical scheme, the thickness D of the notch 321 is set to be 2mm-5mm, so that on one hand, the situation that the end wall 320 is not turned over due to the fact that the notch 321 is too thin is avoided, and on the other hand, the problems that the end wall 320 is broken and the process difficulty is increased due to the fact that the notch 321 is too thick are avoided.

The end wall 320 may further be provided with a pressure relief mechanism for actuating to relieve the internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a threshold value. The threshold design varies according to design requirements. The threshold value may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery cell. The pressure relief mechanism may take the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or configuration, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold value, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be relieved.

As used herein, "activate" means that the pressure relief mechanism is activated or activated to a certain state, such that the internal pressure and temperature of the battery cell are relieved. The actions generated by the pressure relief mechanism may include, but are not limited to: at least a portion of the pressure relief mechanism ruptures, fractures, is torn or opened, or the like. When the pressure relief mechanism is actuated, high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated part as emissions. In this way, the cells can be vented under controlled pressure or temperature, thereby avoiding potentially more serious accidents.

Reference herein to emissions from the battery cell includes, but is not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like.

In some embodiments, score 321 may act as a pressure relief mechanism. The score 321 is reused as a pressure relief mechanism, so that the cell volume and the production cost can be reduced.

Optionally, the entire portion of score 321 may act as a pressure relief mechanism.

Optionally, a portion of score 321 may serve as a pressure relief mechanism. For example, the middle region of the notch 321 may be used as a pressure relief mechanism.

As noted above, the assembly strength requirements of the end wall 320 are typically greater than those of the side wall 310, as other structural members may be provided on the end wall 320. Accordingly, to meet the assembly requirements of the end wall 320, in some embodiments, the maximum thickness of the end wall 320 may be greater than the thickness of the side wall 310.

Alternatively, the thickness of the entire area of the end wall 320 may be greater than the thickness of the side wall 310.

Alternatively, a partial region of the end wall 320 may have a thickness greater than that of the side wall 310, and the remaining region may have the same thickness as that of the side wall 310.

The thickness of the end wall 320 in the embodiment of the present application is not particularly limited, and may be determined specifically according to actual situations.

To facilitate the closing of the opening by end wall 320, the edges of end wall 320 may be thinned. In some embodiments, the end wall 320 may include a rim portion 322 and a main body portion 323, the rim portion 322 being disposed around the main body portion 323, a surface of the rim portion 322 facing the receiving cavity being recessed with respect to the main body portion 323 in a thickness direction of the end wall 320, and forming a step portion 324. Therefore, the end wall 320 is greatly convenient to cover, and the process difficulty is effectively reduced.

Alternatively, an integral part of the rim portion 322 may be recessed relative to the body portion 323 facing surface of the receiving cavity.

Alternatively, a surface of the partial rim portion 322 facing the receiving cavity may be recessed with respect to the main body portion 323, so that a plurality of steps 324 may be formed spaced apart from each other. The distances between two adjacent steps 324 of the plurality of steps 324 spaced apart from each other may be the same or different.

In some embodiments, the projected area of the rim portion 322 may occupy 5% -10% of the projected area of the end wall 320 in the thickness direction of the end wall 320. Such as 8% of the projected area of end wall 320.

According to the technical scheme, in the thickness direction of the end wall 320, the projection area of the edge portion 322 is set to be 5% -10% of the projection area of the end wall 320, so that the end wall 320 can be conveniently covered, and meanwhile, after the electrode assembly 400 is assembled, the end wall 320 can be conveniently folded and then packaged and welded.

In the development of battery technology, the battery is increasingly required to be thin and light. However, if the housing 300 of the battery cell is too thin, the housing 300 may be fused under a high current, i.e., there is a risk of overcurrent. Therefore, the embodiment of the present application may thicken at least a portion of the housing 300 of the battery cell to ensure the overcurrent capacity of the battery cell.

Optionally, at least a portion of end wall 320 may be thickened. For example, the thickened regions above may be multiplexed.

Alternatively, the housing 300 may further include a connection member disposed on the end wall 320 in addition to the electrode terminal 330. The connecting members have been described above and will not be described in detail here.

As an example, the thickness of the entire connection member may be greater than or equal to a threshold value to secure the maximum overcurrent capacity of the battery cell.

As another example, the connecting member may include a first portion and a second portion, wherein a thickness of the first portion is greater than a thickness of the second portion. In other words, the connecting member of the embodiment of the present application is a locally thickened structure.

Wherein the thickness of the first portion may be determined according to the battery capacity and/or the actual over-current demand of the battery cell.

This technical scheme sets up the thickness through the first part with connecting elements to be greater than the thickness of second part, is about to connecting elements sets up to local thickening structure, and when electric current was great, can effectively avoid the condition that shell 300 was fused to guarantee the free maximum current capacity of battery, and then guarantee the security performance of battery.

The housing 300 may further include an insulating member, such as the following plastic, in addition to the electrode terminal 330. The insulator is also disposed on the end wall 320. Optionally, the case 300 may further include a tab welding plate, also disposed on the end wall 320, for welding tabs on the electrode assembly 400 to the electrode terminal 330.

The embodiment of the present application also provides a battery cell, which may include the housing 300 and the electrode assembly 400 of the battery cell in the foregoing embodiments, wherein the electrode assembly 400 is disposed in the housing 300. As described previously, the electrode assembly 400 may include tabs, which are electrically connected with the electrode terminals.

In some embodiments, the tab may be welded with the electrode terminal 330.

In the above description, the welding connection of the tab and the electrode terminal means: the tab is positioned corresponding to the welding region of the electrode terminal 330, and the tab and the electrode terminal are connected by direct welding.

Therefore, in the process of welding the electrode lug and the electrode terminal 330, the electrode lug and the electrode terminal 330 can be welded by using a conventional welding technology, on one hand, the conventional welding technology is mature and simple in process, and can effectively control metal particles (such as welding slag) and the welding area in the welding process, and on the other hand, the conventional welding technology is adopted, so that the energy density loss in the welding process is small, and the energy density of a battery can be effectively ensured.

Alternatively, in the welding of the electrode terminal 330 and the tab, the welding may be performed using spot welding, such as circular spot welding or square spot welding. Of course, other welding methods may be used, and the present application is not limited thereto. Such as ultrasonic welding or laser welding.

Having described the battery cell of the embodiment of the present application, the method of manufacturing the battery cell of the embodiment of the present application will be described below, and a part not described in detail may be referred to the foregoing embodiments.

It should be noted that, the following description will be made by taking the case 300 as an aluminum case structure, where the two end walls 320 are connected to the first wall 311 of the side wall 310, the electrode terminal 330 and the lower plastic are disposed on the end walls 320, and the structure before the end walls 320 cover the opening is referred to as an extension, but it should be understood that the embodiment of the present application is not limited thereto.

First, the one-piece aluminum shell structure is sized to obtain the structure shown in fig. 4. As can be seen from fig. 4, the one-piece aluminum shell structure includes an extension.

Alternatively, the size of the housing 300 may be determined according to the capacity of the battery cell.

Alternatively, the one-piece aluminum shell structure may be sized by a cutting or injection molding process.

Next, a scoring process is performed at the junction of the extension and the first wall 311, resulting in the structure shown in fig. 5. As can be seen in fig. 5, the aluminum shell structure includes a score 321.

Next, the aluminum shell structure is folded to obtain a receiving cavity with both ends open, as shown in fig. 7. Optionally, a tooling fixture may be used to perform lap welding on the aluminum shell structure.

Thereafter, a splice welding is performed on the second wall 340 of the housing 300.

Next, the electrode terminal 330 is assembled on the extension portion, resulting in the structure shown in fig. 3. Further, a lower plastic is also fitted on the extension.

Alternatively, an electrode lead-out hole may be reserved when the one-piece aluminum case structure is cut or injection molded, and the electrode lead-out hole is used to accommodate the electrode terminal 330, then the electrode terminal 330 may be directly connected in this step; alternatively, the electrode lead-out hole may be obtained by impacting or otherwise obtaining the extension part when the electrode terminal 330 is assembled.

After the electrode terminal 330 and the lower plastic are mounted on the extension, the assembly of the electrode assembly 400 may be performed.

Alternatively, the electrode assembly 400 may be obtained by lamination and tab-extraction at both sides.

After the electrode assembly 400 is assembled, as shown in fig. 8, the electrode assembly 400 is placed in the receiving cavity having both ends opened, and the tabs of the electrode assembly 400 are welded to the electrode terminals 330.

Finally, the extending part is folded through the notch 321 to obtain the end wall 320 of the outer case 300, and the outer case 300 is enveloped to obtain the battery cell.

The embodiment of the present application further provides an electric device, where the electric device may include the battery in the foregoing embodiments, and the battery is used to provide electric energy to the electric device.

In some embodiments, the powered device may be the vehicle 1, the ship, or the spacecraft of fig. 1.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (15)

1. A battery cell housing, comprising:

a side wall (310) enclosing a receiving cavity with at least one open end, wherein the receiving cavity is used for receiving an electrode assembly (400);

an end wall (320) for closing the opening to seal the receiving cavity;

an electrode terminal (330) disposed on the end wall (320);

wherein the housing (300) is of a one-piece construction.

2. The housing according to claim 1, wherein the side walls (310) enclose a receiving cavity which is open at both ends, the side walls (310) comprising a first wall (311), the end walls (320) being connected to both ends of the first wall (311).

3. The housing according to claim 2, characterized in that the first wall (311) is the largest area wall of all the walls of the housing (300).

4. A housing according to claim 2 or 3, characterized in that the junction of the first wall (311) and the end wall (320) is provided with a score (321).

5. The housing according to claim 4, wherein the dimension (L) of the score (321) is 2-5 mm.

6. The housing according to claim 4, wherein the thickness (D) of the score (321) is 2-5 mm.

7. A casing according to any one of claims 1 to 3, wherein the maximum thickness of the end wall (320) is greater than the thickness of the side wall (310).

8. A casing according to any one of claims 1 to 3, wherein the end wall (320) comprises a rim portion (322) and a main portion (323), the rim portion (322)

The surface of the edge portion (322) facing the accommodating cavity is recessed relative to the main body portion in the thickness direction of the end wall (320) and forms a step portion (324) around the main body portion (323).

9. A housing according to claim 8, characterized in that the projected area of the rim portion (322) in the thickness direction of the end wall (320) is 5-10% of the projected area of the end wall (320).

10. The enclosure of any of claims 1 to 3, wherein the side wall (310) comprises a second wall (340), the closure (341) of the unitary structure being disposed on the second wall (340), wherein the second wall (340) is the smallest area of the side walls (310).

11. The enclosure of any one of claims 1 to 3, further comprising:

a connecting member disposed on the end wall (320), the connecting member including a first portion and a second portion, wherein a thickness of the first portion is greater than a thickness of the second portion.

12. A battery cell, comprising:

a housing (300) of a battery cell according to any of claims 1 to 11;

an electrode assembly (400) disposed within the case (300), the electrode assembly (400) including tabs, the tabs being electrically connected with the electrode terminals.

13. The battery cell according to claim 12, wherein the tab is welded to the electrode terminal (330).

14. A battery, comprising:

the battery cell according to claim 12 or 13;

the box body is used for accommodating the battery cells.

15. An electrical device, comprising: the battery of claim 14, the battery to provide electrical energy to the powered device.

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