CN219575866U

CN219575866U - Battery monomer, battery and power consumption device

Info

Publication number: CN219575866U
Application number: CN202320199666.9U
Authority: CN
Inventors: 陈新祥; 郑于炼; 林蹬华; 黄守君; 陈龙; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-08-22
Anticipated expiration: 2033-02-10

Abstract

The application is suitable for the technical field of batteries, and provides a battery cell, a battery and an electric device. The electrode terminal is arranged on the shell; the electrode terminal has opposite first and second walls, the first wall is used for welding with the busbar; at least part of the flame retardant structure is located on a side of the second wall remote from the first wall. Through adopting above-mentioned technical scheme, through being located the second wall of electrode terminal one side of keeping away from first wall with fire-retardant structure's at least part, can make fire-retardant structure can be relative with first wall to can block the laser beam of first wall, and then can improve laser and reveal in order to weld through, burn out the free problem of battery.

Description

Battery monomer, battery and power consumption device

Technical Field

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

Background

In the field of batteries, electrode terminals of battery cells are typically welded with a bus bar to achieve series, parallel or series-parallel connection between a plurality of battery cells.

In some cases, in the process of welding the bus bar and the electrode terminals of the battery cells, the laser beam generated during welding is easy to weld through the electrode terminals, so that the shell of the battery cells is welded through and burned, and the battery cells are damaged.

Disclosure of Invention

In view of the above problems, embodiments of the present utility model provide a battery cell, a battery, and an electric device, which can improve the problem that the battery cell is welded through in the welding process of the battery cell and a busbar.

In a first aspect, an embodiment of the present utility model provides a battery cell, including:

a housing;

an electrode terminal provided to the case; the electrode terminal has opposite first and second walls, the first wall is used for welding with the busbar;

and the flame retardant structure is at least partially positioned on one side of the second wall away from the first wall.

Through adopting above-mentioned technical scheme, through set up first wall and second wall respectively in electrode terminal's relative both sides, with the at least part of fire-retardant structure lie in the second wall one side of keeping away from first wall to make fire-retardant structure and first wall relative, thereby can block the laser beam of first wall, and then can improve the laser beam and reveal, with the problem of welding through, burn-through battery monomer.

In some embodiments, the electrode terminal includes a post and a connecting piece connected to the post, the post is provided on the housing, and the first wall and the second wall are provided on opposite sides of the connecting piece, respectively.

Through adopting above-mentioned technical scheme, be convenient for electrode terminal and busbar connection for electrode terminal and busbar have great fixed conducting strength after accomplishing the welding.

In some embodiments, the connecting piece comprises a first sheet body and a second sheet body which is connected to the first sheet body in a bending way, and the first sheet body is connected to the pole; the first wall and the second wall are respectively arranged on two opposite sides of the second lamellar body.

By adopting the technical scheme, the second sheet body is bent and connected to the first sheet body, so that the first wall of the second sheet body can face to a proper direction, the first wall is convenient to contact with the bus bar and weld with the bus bar, and the welding process of the electrode terminal and the bus bar is facilitated to be simplified.

In some embodiments, the housing has a first housing wall along a first direction, the post is disposed on the first housing wall, at least a portion of the second tab is disposed outside an end of the first housing wall along a second direction, the first direction and the second direction intersect, and the first direction is perpendicular to the first housing wall.

Through adopting above-mentioned technical scheme, can directly carry out welding operation outside the one end of battery monomer along the second direction, the welding operation of every battery monomer's electrode terminal and busbar of being convenient for to be convenient for realize series connection, parallelly connected or the series-parallel connection between a plurality of battery monomers.

In some embodiments, the second tab extends in a first direction away from the housing and the flame retardant structure is configured to face a battery cell adjacent to the first housing wall.

By adopting the technical scheme, the first walls of the battery cells can be opposite to the battery cells adjacent to the first shell wall along the second direction, so that the directions of the first walls of the battery cells are similar, and the bus bars are convenient to realize the welding operation of the electrode terminals of the two adjacent battery cells respectively.

In some embodiments, the second sheet extends in a first direction toward the housing, and at least a portion of the flame retardant structure is disposed between the second sheet and the housing.

By adopting the technical scheme, the directions of the first walls of the battery cells are approximately similar, so that the bus bars are convenient to realize the welding operation of the electrode terminals of the adjacent two battery cells respectively.

In some embodiments, the side of the first sheet facing the second sheet is provided with a flame retardant structure.

Through adopting above-mentioned technical scheme, when the laser beam was revealed from the second wall of second lamellar body, the fire-retardant structure on the first lamellar body also can realize blockking to the laser beam, then first fire-retardant piece and second fire-retardant piece can realize the dual effect of blockking to the laser beam to the double problem of improving laser beam and melting through place battery monomer or adjacent battery monomer.

In some embodiments, the housing further has a second housing wall, the first housing wall and the second housing wall being opposite in the first direction; the second case wall is provided with a groove for avoiding an electrode terminal of a battery cell adjacent to the second case wall.

By adopting the technical scheme, the two adjacent shells can be mutually close along the first direction, so that the two adjacent battery monomers have higher structural compactness.

In some embodiments, the first wall has a weld location for welding with the bus bar, and the orthographic projection of the flame retardant structure on the first wall covers the weld location.

Through adopting above-mentioned technical scheme, when the welding position of the first wall of electrode terminal is radiated to the laser beam to when realizing electrode terminal and busbar's welding, flame retardant structure covers the welding position, thereby can block the laser beam that leaks from the welding position betterly, and then can improve the laser beam and reveal the problem that causes the battery monomer or the adjacent battery monomer that electrode terminal is located to be welded through, burn.

In some embodiments, at least a portion of the flame retardant structure is secured to the second wall.

By adopting the technical scheme, the position of the flame-retardant structure on the second wall is stable and reliable, the flame-retardant structure is convenient to realize the blocking effect on the laser beam, and the problem that the battery monomer is welded through is solved.

In some embodiments, the flame retardant structure is a mica structure, a ceramic structure, a glass fiber structure, a carbon-carbon composite part, or a pre-oxidized silk aerogel part.

By adopting the technical scheme, the flame-retardant structure has a better effect of blocking the laser beam, so that the protection effect on the battery monomer or the adjacent battery monomer where the flame-retardant structure is located can be effectively realized.

In some embodiments, the flame retardant structure has a thermal conductivity of 0.7W/mK or less; and/or the melting point of the flame retardant structure is greater than 800 ℃.

Through setting the flame retardant structure to the structure that the coefficient of heat conductivity is less and/or the fusing point is great, can make the flame retardant structure have weaker heat conduction effect, and then make the flame retardant structure have better effect of blocking the laser beam.

In a second aspect, an embodiment of the present application provides a battery including:

a busbar;

a plurality of battery cells, the first wall of the electrode terminal of two adjacent battery cells is welded with the bus bar.

The battery provided by the embodiment of the application can also solve the problem that the battery monomer is welded through and burned out due to the leakage of the laser beam in the welding process due to the adoption of the battery monomer related to the embodiment, so that the battery has higher quality.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

The battery provided by the embodiment of the application can also solve the problem that the battery is welded through and burned out due to the leakage of the laser beam in the welding process due to the adoption of the battery cell related to the embodiment, so that the battery cell has higher quality, and further the power utilization device has higher quality.

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 or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle provided in some embodiments of the application;

FIG. 2 is an exploded view of a battery provided in some embodiments of the application;

fig. 3 is a schematic perspective view of a battery cell according to some embodiments of the present application;

FIG. 4 is an enlarged view of FIG. 3 at A;

fig. 5 is a schematic diagram illustrating the cooperation between two battery cells and a bus bar according to some embodiments of the present application;

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

FIG. 7 is a side view of FIG. 5;

FIG. 8 is an enlarged view of FIG. 7 at C;

FIG. 9 is a side view of two battery cells mated with a buss bar according to other embodiments of the present application;

fig. 10 is an enlarged view of D in fig. 9;

FIG. 11 is a schematic diagram of two battery cells and a bus bar according to another embodiment of the application;

fig. 12 is an enlarged view at E in fig. 11.

Wherein, each reference sign in the figure:

1000-cell; 2000-controller; 3000-motor; 100-battery cells; 100 a-a first cell; 100 b-a second battery cell; 200-a box body; 210-a first part; 220-a second portion; 300-bus bar; 10-a housing; 101-grooves; 102-a first shell wall; 103-a second shell wall; 11-a housing; 12-end caps; 13-flanging; 20-electrode terminals; 201-a first wall; 202-a second wall; 21-pole; 22-connecting sheets; 221-a first sheet; 222-a second sheet; 30-flame retardant structure; 31-a first flame retardant; 32-a second flame retardant; 40-an adhesive layer; z-a first direction; y-second direction.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.

In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements 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," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the present application, the meaning of "plurality" is two or more, and "two or more" includes two unless specifically defined otherwise. Accordingly, "multiple sets" means more than two sets, including two sets.

In the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, the term "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the field of batteries, a plurality of battery cells are usually connected in series, parallel or series-parallel electrical connection through a bus bar. The series-parallel connection means that the battery monomers are connected in series or in parallel. Specifically, the electrode terminals of two adjacent battery cells are all welded with the bus bar by laser, so that the electrical connection is realized.

In some cases, in the process of performing laser welding on the bus bar and the electrode terminals of the battery cells, the generated laser beam easily passes through the electrode terminals to leak, and then passes through and burns out the casing or the end cover of the battery cells, so that the quality of the battery cells is damaged.

Here, laser welding is a highly efficient and precise welding method using a laser beam with a high energy density as a heat source. In the laser welding process, laser beams radiate to the bus bars and the electrode terminals, heat generated by the laser beams is diffused in the bus bars and the electrode terminals so that the bus bars and the electrode terminals are melted to form a specific molten pool, and finally, the bus bars and the electrode terminals are welded and fixed and conducted.

Since the electrode terminal is provided in a metal structure having an electric conductive property, the electrode terminal has a high heat conductive property to be easily melted under high temperature conditions. Based on this, if the heat generated by the laser beam is excessively large or the thickness of the electrode terminal is excessively small during the laser welding, the electrode terminal is melted through by the heat generated by the laser beam when the heat generated by the laser beam is diffused inside the electrode terminal. Thus, after the electrode terminal is melted through, the laser beam can leak to one side of the electrode terminal, which is opposite to the busbar, through the melted through position of the electrode terminal, and then leak to the shell or the end cover of the battery cell, so that the shell or the end cover of the battery cell is melted through by the laser beam, and the quality of the battery cell is easily damaged.

In view of the foregoing, a first aspect of the embodiments of the present application provides a battery cell, in which a first wall and a second wall are disposed opposite to each other at an electrode terminal, the first wall is used for welding with a busbar, and at least a portion of a flame retardant structure is located on a side of the second wall away from the first wall, so that the flame retardant structure is opposite to the first wall, thereby blocking a laser beam of the first wall, and further improving leakage of the laser beam, so as to solve the problems of welding through and burning the battery cell.

In some embodiments of the present application, the battery cell disclosed in the embodiments of the present application may be used in an electric device that uses a battery or a battery cell as a power source.

The battery referred to by embodiments of the present application may include one or more battery cells to provide a single physical module of higher voltage and capacity. When a plurality of battery cells are arranged, the plurality of battery cells are connected in series, in parallel or in series-parallel through the converging component, and the series-parallel refers to that the plurality of battery cells are connected in series or in parallel.

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage electric cabinet, an energy storage container and the like.

The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like.

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

Referring to fig. 1, fig. 1 is a schematic diagram of a vehicle according to some embodiments of the application. The battery 1000 is provided in the interior of the vehicle, and the battery 1000 may be provided at the bottom or the head or the tail of the vehicle. The battery 1000 may be used for power supply of a vehicle, for example, the battery 1000 may be used as an operating power source of the vehicle.

The vehicle may also include a controller 2000 and a motor 3000, the controller 2000 being configured to control the battery 1000 to power the motor 3000, for example, for operating power requirements during start-up, navigation and travel of the vehicle. In some embodiments of the application, battery 1000 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle to provide driving power for the vehicle instead of or in part instead of fuel oil or natural gas.

Fig. 2 is an exploded view of a battery 1000 provided in some embodiments of the application. Referring to fig. 2, the battery 1000 includes a battery cell 100 and a case 200, and the case 200 is used to house the battery cell 100.

The case 200 is a part accommodating the battery cell 100, and the case 200 provides an accommodating space for the battery cell 100, so that the battery cell 100 has high reliability and stability. The case 200 may take a variety of structures. In some embodiments, the case 200 may include a first portion 210 and a second portion 220, where the first portion 210 and the second portion 220 are covered with each other and together define the accommodating space. The first portion 210 may be a hollow structure having an opening at one end, the second portion 220 may be a plate-shaped structure, and the second portion 220 covers the opening side of the first portion 210, so that the first portion 210 and the second portion 220 together define the accommodating space. Alternatively, each of the first and second parts 210 and 220 may have a hollow structure having an opening at one end, as shown in fig. 2, the opening side of the first part 210 is covered with the opening side of the second part 220, so that the first and second parts 210 and 220 together define the receiving space. In addition, the case 200 formed by the first and second parts 210 and 220 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 1000, the number of the battery cells 100 may be one or a plurality. When the number of the battery cells 100 is plural, the plural battery cells 100 may be connected in series or parallel or in series-parallel, and the series-parallel refers to that the plural battery cells 100 are connected in series or parallel. The plurality of battery cells 100 may be formed as one unit by serial connection, parallel connection, or series-parallel connection, and then the unit formed by the plurality of battery cells 100 is directly received in the receiving space formed by the case 200. The plurality of battery units 100 may be connected in series, parallel or series-parallel to form a plurality of modules, each module is fixed by a corresponding fixing component to form the battery module, that is, the plurality of battery units 100 form a plurality of battery modules, and the plurality of battery modules are connected in series, parallel or series-parallel to form a whole and are accommodated in the accommodating space defined by the box 200.

The battery cell 100 refers to the smallest unit that stores and outputs electric power. The battery cell 100 may be a secondary battery or a primary battery. The battery cell 100 may be a metal battery, a lithium-sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Fig. 3 is a schematic diagram of a battery cell 100 according to some embodiments of the present application. Referring to fig. 3, a battery cell 100 includes a case 10 and an electrode assembly (not shown).

The electrode assembly is a component in which electrochemical reactions occur in the battery cell 100. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a diaphragm is arranged between the positive electrode plate and the negative electrode plate. The positive pole piece and the negative pole piece are provided with active substances, the parts of the positive pole piece and the negative pole piece, which are not provided with active substances, form main body parts of the electrode assembly, the parts of the positive pole piece and the negative pole piece, which are not provided with active substances, form electrode lugs respectively, the electrode lugs of the positive pole piece are positive electrode lugs, the electrode lugs of the negative pole piece are negative electrode lugs, and the positive electrode lugs and the negative electrode lugs can be jointly positioned at one end of the main body parts or respectively positioned at two ends of the main body parts. The electrode lug is a current transmission end of the electrode assembly and is used for transmitting current.

In the battery cell 100, the number of electrode assemblies may be one or more.

In some instances, the electrode assembly may also be referred to as a cell, bare cell, wound body, laminate, or the like.

In some embodiments, the battery cell 100 further includes an electrolyte that serves to conduct ions between the positive and negative electrode sheets. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

In some embodiments, the case 10 includes a case 11 and an end cap 12, the case 11 and the end cap 12 being members for defining together an internal environment of the battery cell 100, the internal environment defined by the case 11 and the end cap 12 for accommodating the electrode assembly and the electrolyte.

In some implementations, the case 11 and the end cap 12 may be separate components, specifically, the case 11 has an opening, and the end cap 12 covers the opening of the case 11 to define the internal environment of the battery cell 100 together with the case 11 and isolate the internal environment of the battery cell 100 from the external environment. For example, as shown in fig. 3, for a thin sheet battery, after the end cap 12 is covered on the opening of the case 11, the peripheral edge of the end cap 12 and the peripheral edge of the opening of the case 11 are fixed by welding.

In other embodiments, the case 11 and the end cap 12 may be integrally formed, specifically, a common connection surface may be formed between the end cap 12 and the case 11 before the electrode assembly is put into the case, and when the electrode assembly needs to be packaged after the electrode assembly is put into the case, the end cap 12 is put into the case 11 again. For example, when the battery cell 100 is a soft-pack battery, the aluminum-plastic film may be punched to form the housing 11 and the end cover 12 of the battery cell 100, then the electrode assembly is put into the internal environment formed by punching the aluminum-plastic film, and then the opening of the aluminum-plastic film is fixed by sealing edges such as side sealing and top sealing. Of course, the battery cell 100 may not be limited to a soft pack battery, and the materials of the case 11 and the end cap 12 are not limited to an aluminum plastic film.

It should be added here that the number of end caps 12 may be one. Of course, the number of the end caps 12 may be two, and the two end caps 12 are respectively provided at both ends of the housing 11.

In the above two implementations, the case 11 may be in the shape of a cylindrical case, a square case, or the like, and may be specifically determined according to the specific shape and size of the electrode assembly. Moreover, the materials of the housing 11 and the end cap 12 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.

The battery cell 100 according to the embodiment of the present application may be a cylindrical battery, a prismatic battery, a pouch battery, or other battery cells, where the prismatic battery includes a square battery, a blade battery, a polygonal battery, and the like.

It should be noted that, although the battery cell 100 according to the embodiment of the present application is improved based on the technical problem of the laser welding, other welding methods than the laser welding may be used for the battery cell 100 during the welding. For convenience of description, the embodiments of the present application have been described with reference to laser welding.

Fig. 3 illustrates a perspective view of a battery cell 100 provided in some embodiments of the present application, fig. 4 illustrates a partially enlarged view of fig. 3, fig. 5 illustrates a partially perspective view of a battery 1000 provided in some embodiments of the present application, fig. 6 illustrates a partially enlarged view of fig. 5, fig. 7 illustrates a side view of fig. 5, and fig. 8 illustrates a partially enlarged view of fig. 7. Referring to fig. 3 to 8, a battery cell 100 according to some embodiments of the present application includes a housing 10, an electrode terminal 20, and a flame retardant structure 30. The electrode terminal 20 is provided to the case 10. The electrode terminal 20 has opposite first and second walls 201 and 202, the first wall 201 being for welding with the bus bar 300. At least a portion of the flame retardant structure 30 is located on a side of the second wall 202 remote from the first wall 201.

The electrode terminal 20 is a current transmitting end of the battery cell 100 for transmitting current. Specifically, in some embodiments, the battery cell 100 further includes an electrode assembly disposed within the case 10, and the electrode terminal 20 is disposed at the case 10 and is in communication with the electrode assembly of the battery cell 100. The electrode terminal 20 may be welded to the bus bar 300 to achieve conduction between the electrode terminal 20 and the bus bar 300. When the bus bars 300 are welded to the electrode terminals 20 of the adjacent two battery cells 100, respectively, the two battery cells 100 may be electrically connected.

The electrode terminal 20 may be, but not limited to, a metal structure of copper, aluminum, or the like, so that the electrode terminal 20 has a good heat conductive property and a low melting point, thereby being capable of being melted under high temperature conditions to form a molten pool. Thus, when the electrode terminal 20 is welded to the bus bar 300, the electrode terminal 20 may be melted by the heat generated by the laser beam to form a molten pool by its metal properties to achieve a welding fixing effect with the bus bar 300. In addition, the electrode terminals 20 may be electrically connected to the electrode assembly and the bus bars 300, respectively, by their metal properties.

The electrode terminal 20 has opposite sides, and one of the opposite sides of the electrode terminal 20 has a first wall 201 and the other side has a second wall 202. Wherein, the first wall 201 and the second wall 202 are both wall surfaces of the electrode terminal 20.

The first wall 201 is used to weld the bus bar 300, and at least part of the flame retardant structure 30 is located at a side of the second wall 202 of the electrode terminal 20 remote from the first wall 201, such that at least part of the flame retardant structure 30 and the bus bar 300 are located at opposite sides of the electrode terminal 20, respectively. In this way, at least part of the flame retardant structure 30 may be disposed opposite to the bus bar 300, thereby being capable of blocking the laser beam generated when the bus bar 300 is welded.

The bus bar 300 may be disposed on the first wall 201 of the electrode terminal 20 and welded to the electrode terminal 20, so that the electrode terminal 20 is welded to the bus bar 300 through the first wall 201 and is electrically connected.

Wherein the flame retardant structure 30 may be fixed to the second wall 202, or may be fixed to the battery cell 100 at other locations than the second wall 202, for example, the flame retardant structure 30 may be fixed to the case 10, but is not limited thereto.

The flame retardant structure 30 is a member having a flame retardant effect. Specifically, the flame retardant structure 30 has a lower thermal conductivity and a higher melting point. When the laser beam is irradiated to the flame retardant structure 30, heat generated by the laser beam is difficult to spread inside the flame retardant structure 30, and thus it is difficult to melt the flame retardant structure 30. Thus, it is difficult for the laser beam to melt through the flame retardant structure 30, that is, the flame retardant structure 30 can block the laser beam well. The portion of the flame retardant structure 30 on the second wall 202 is a first flame retardant member 31. In some embodiments, as shown in fig. 3 and 4, the first flame retardant member 31 is a sheet-like structure.

In the battery cell 100 provided by the embodiment of the application, the electrode terminal 20 is provided with the first wall 201 and the second wall 202 which are opposite, the first wall 201 is used for being welded with the busbar 300, and at least part of the flame retardant structure 30 is positioned on one side of the second wall 202 away from the first wall 201. In this way, in the process of welding the electrode terminal 20 and the bus bar 300, the bus bar 300 is first disposed on the first wall 201 of the electrode terminal 20, and then the laser beam is radiated to the electrode terminal 20 and the bus bar 300, so that the heat generated by the laser beam is diffused inside the electrode terminal 20 and the bus bar 300, and the electrode terminal 20 and the bus bar 300 are melted to form a molten pool, and the welding fixing and conducting effects are realized.

When the heat generated by the laser beam is excessively large or the size of the electrode terminal 20 in the distribution direction of the first wall 201 and the second wall 202 is small, the heat generated by the laser beam may melt through the electrode terminal 20, so that the laser beam leaks from the first wall 201 to the second wall 202 of the electrode terminal 20 through the melt-through position of the electrode terminal 20 to radiate to the flame retardant structure 30 on the second wall 202. Based on the low heat conductive property and the high melting point of the flame retardant structure 30, the heat generated by the laser beam is difficult to diffuse inside the flame retardant structure 30, thereby making it difficult to melt the flame retardant structure 30. In other words, the flame retardant structure 30 may block the laser beam leaking from the first wall 201 to the second wall 202 of the electrode terminal 20, thus making it difficult for the laser beam to leak from the second wall 202 of the electrode terminal 20 to the outside.

If the flame retardant structure 30 is not provided, when the laser beam passes through the electrode terminal 20 to leak the laser beam from the second wall 202 of the electrode terminal 20 to the outside, the laser beam may then leak to the battery cell 100 or the adjacent battery cell 100 where the electrode terminal 20 is located, and then pass through the case 10 of the battery cell 100 or the case 10 of the adjacent battery cell 100, thereby causing damage to the case 10 or the adjacent case 10. In this embodiment, the flame retardant structure 30 is opposite to the first wall 201, so that the laser beam leaking from the second wall 202 of the electrode terminal 20 can be blocked, and the problem that the laser beam leaks to the outside to leak to the casing 10 or the adjacent casing 10 where the electrode terminal 20 is located can be improved, and the protection effect on the battery cell 100 or the adjacent battery cell 100 where the electrode terminal 20 is located can be further achieved. Based on this, the problem of leakage of the laser beam to the outside and penetration and burning of the battery cell 100 can be improved.

When the laser beam is irradiated to the electrode terminal 20 and the bus bar 300, the laser beam may be irradiated to the electrode terminal 20 and the bus bar 300 at positions corresponding to the flame retardant structure 30 in the distribution direction of the first wall 201 and the second wall 202, so that the flame retardant structure 30 may correspondingly block the laser beam.

In some cases, to improve the problem of leakage of the laser beam from the first wall 201 to the outside of the second wall 202 of the electrode terminal 20, the size of the electrode terminal 20 in the distribution direction of the first wall 201 and the second wall 202 is generally increased, which can improve the problem of the laser beam penetrating the electrode terminal 20. However, such an arrangement increases the volume and weight of the electrode terminal 20, and thus the weight and volume of the battery cell 100. According to the battery cell 100 provided by the embodiment of the application, the flame retardant structure 30 is arranged on the side, far away from the first wall 201, of the second wall 202 of the electrode terminal 20, so that the problem that the electrode terminal 20 is welded through is not needed to be considered too much, even if the electrode terminal 20 is welded through in the welding process, the leaked laser beam can be blocked by the flame retardant structure 30, and therefore, on the basis of being capable of realizing the welding effect of the electrode terminal 20 and the busbar 300, the size of the electrode terminal 20 in the distribution direction of the first wall 201 and the second wall 202 is reduced as much as possible, the volume and the weight of the battery cell 100 are reduced to a certain extent, and the energy density of the battery 1000 with the battery cell 100 is further improved.

In some embodiments, referring to fig. 3 to 8, the electrode terminal 20 includes a post 21 and a connecting piece 22. The pole 21 is disposed on the housing 10, the connecting piece 22 is connected to the pole 21, and the first wall 201 and the second wall 202 are disposed on opposite sides of the connecting piece 22.

Specifically, the electrode post 21 is disposed at the case 10 and is in electrical communication with the electrode assembly of the battery cell 100.

The connecting piece 22 is a sheet metal structure such as a copper sheet, an aluminum sheet, and the like. The connection piece 22 and the pole 21 can be fixed and conducted by bolt fixing, rivet fixing, riveting and the like.

Wherein, one part of the connecting piece 22 is fixedly conducted with the pole 21, and the first wall 201 and the second wall 202 are respectively arranged on two opposite sides of the other part of the connecting piece 22. Specifically, the first wall 201 is provided on one side of the other portion of the connecting piece 22 in the thickness direction thereof, and the second wall 202 is provided on the other side of the other portion of the connecting piece 22 in the thickness direction thereof.

By adopting the above technical scheme, the electrode terminal 20 is provided to include the post 21 and the connection piece 22, so that the connection piece 22 can be extended to a proper position, which facilitates the electrode terminal 20 to contact with the bus bar 300 and perform the welding operation, and helps to simplify the welding process of the electrode terminal 20 and the bus bar 300. Based on this, compared with the scheme that the electrode terminal 20 is completely located between two adjacent housings 10, the welding operation is more open, the welding operation is easier to be realized, the risk that the laser beam leaks to the battery cell 100 or the adjacent battery cell 100 in the welding process can be reduced, and the protection effect on the battery cell 100 or the adjacent battery cell 100 where the electrode terminal 20 is located can be effectively realized. In addition, the first wall 201 of the electrode terminal 20 may be disposed on the surface of the connecting piece 22, that is, the first wall 201 may be disposed on one side of the corresponding portion of the connecting piece 22 in the thickness direction, so that the first wall 201 of the connecting piece 22 has a larger area, the welding operation between the electrode terminal 20 and the bus bar 300 is convenient, and the electrode terminal 20 and the bus bar 300 have a larger fixed conductive strength after welding.

It should be noted that, when the electrode terminal 20 and the bus bar 300 are welded, the bus bar 300 may be disposed on the first wall 201 of the connecting piece 22, and then the laser beam is radiated to the bus bar 300 and the connecting piece 22, so that the heat generated by the laser beam is diffused inside the bus bar 300 and the connecting piece 22, and the connecting piece 22 and the bus bar 300 are melted to form a molten pool, so as to achieve the effect of welding, fixing and conducting. When the laser beam is melted through the connecting sheet 22 from the first wall 201, the laser beam leaks from the welding position of the connecting sheet 22 and is blocked by the flame retardant structure 30, so that the laser beam is difficult to leak to the battery cell 100 or the adjacent battery cell 100 where the flame retardant structure 30 is located, and the problem that the laser beam leaks to the battery cell 100 or the adjacent battery cell 100 where the connecting sheet 22 is located can be improved.

In some embodiments, referring to fig. 3 to 8, the connecting piece 22 includes a first piece 221 and a second piece 222. The second sheet 222 is bent and connected to the first sheet 221, and the first sheet 221 is connected to the pole 21. The first wall 201 and the second wall 202 are disposed on opposite sides of the second blade 222, respectively.

It will be appreciated that the first tab 221 is a portion of the connection tab 22 for connection with the post 21, and the second tab 222 is a portion of the connection tab 22 for welding the bus bar 300. Wherein, the first sheet 221 and the second sheet 222 are both sheet structures. The second sheet 222 has a first wall 201 on one side and a second wall 202 on the other side, which are opposite to each other in the thickness direction thereof. That is, one side of the second sheet 222 in the thickness direction thereof is used for welding the bus bar 300, and at least part of the flame retardant structure 30 is located at the other side of the second sheet 222 in the thickness direction thereof.

The first wall 201 is disposed on one side of the second sheet 222 along the thickness direction of the second sheet 222, so that the first wall 201 has a larger area, and can contact the bus bar 300 and be welded with the bus bar 300 through the larger area, thereby facilitating the convenience and strength of welding the bus bar 300 and the electrode terminal 20.

By adopting the above technical solution, the second sheet 222 is bent and connected to the first sheet 221, so that the first wall 201 of the second sheet 222 can be oriented in a proper direction. Illustratively, the first wall 201 of the second tab 222 may face in a direction intersecting the distribution direction of the plurality of battery cells 100 such that the first wall 201 of the second tab 222 faces outside the housing 10. For example, as shown in fig. 5 to 8, the plurality of battery cells 100 are arranged along a direction Z, and the first wall 201 of the second sheet 222 may be disposed toward a direction Y, which is perpendicular to the direction Z. This facilitates the first wall 201 to contact the bus bar 300 and to be welded with the bus bar 300, thereby helping to simplify the welding process of the electrode terminal 20 and the bus bar 300.

It should be noted that, since the second sheet 222 is bent with respect to the first sheet 221, the first wall 201 of the second sheet 222 may face in a suitable direction, for example, the first wall 201 may face out of the housing 10. In this way, one side of the second wall 202 of the second sheet 222 is easily oriented toward the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. If the flame retardant structure 30 is not provided, when the heat generated by the laser beam is excessively large or the thickness of the second sheet 222 is excessively small, the laser beam easily melts through the second sheet 222 in the thickness direction of the second sheet 222 and leaks to the outside through the second wall 202 of the second sheet 222, thereby leaking to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. According to the battery cell 100 of the embodiment of the application, at least part of the flame retardant structure 30 is arranged on the second wall 202 of the second sheet 222, and in the welding process, the flame retardant structure 30 can block the laser beam leaking to one side of the second wall 202 of the second sheet 222 when the laser beam passes through the second sheet 222, so that the problem that the laser beam leaks to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is positioned can be solved. In addition, since the flame retardant structure 30 may block the laser beam, the thickness of the second sheet 222 may be appropriately reduced, thereby contributing to a reduction in weight and volume of the electrode terminal 20, and thus to an improvement in energy density of the battery 1000 composed of the battery cells 100 in which the electrode terminal 20 is located.

In some embodiments, referring to fig. 3 to 8, the housing 10 is provided with a first housing wall 102 along a first direction Z, the pole 21 is disposed on the first housing wall 102 of the housing 10, at least a portion of the second sheet 222 is located outside one end of the first housing wall 102 along a second direction Y, the first direction Z and the second direction Y intersect, and the first direction Z is perpendicular to the first housing wall 102.

As shown in fig. 3 and 4, the first direction Z is shown as direction Z and the second direction Y is shown as direction Y. The first direction Z and the second direction Y intersect, which means that the first direction Z and the second direction Y are not parallel. The first direction Z may be perpendicular to the second direction Y or not. In some embodiments, as shown in fig. 3 and 4, the housing 10 has a rectangular parallelepiped shape, and the housing 10 has a length direction, a thickness direction, and a width direction. The first direction Z may be the thickness direction of the housing 10, the second direction Y may be the length direction of the housing 10, and the width direction of the housing 10 may be the length direction or the width direction of the housing 10, as shown in the drawing, or the second direction Y may be the width direction or the thickness direction of the housing 10.

By adopting the above-mentioned technical solution, at least part of the second sheet 222 is located outside one end of the first shell wall 102 along the second direction Y. Based on this, the plurality of battery cells 100 of the battery 1000 may be arranged along the direction (e.g., the first direction Z) intersecting the second direction Y, as shown in fig. 5 to 8, at least a portion of the second sheet 222 of each battery cell 100 is located outside one end of the plurality of housings 10 along the second direction Y, and then the first wall 201 of the second sheet 222 of each battery cell 100 is located outside one end of the plurality of housings 10 along the second direction Y, so that the welding operation is not required to be performed by extending the bus bar 300 between two adjacent battery cells 100, but the welding operation may be performed directly outside one end of the battery cell 100 along the second direction Y, so that the welding operation between the electrode terminal 20 of each battery cell 100 and the bus bar 300 is facilitated, thereby facilitating the implementation of the series connection, parallel connection or series-parallel connection between the plurality of battery cells 100.

Since at least a portion of the second sheet 222 extends beyond one end of the first housing wall 102 along the second direction Y, and the second sheet 222 is bent and connected to the first sheet 221, the second wall 202 of the second sheet 222 is easily oriented to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. If the flame retardant structure 30 is not provided, it is easy to radiate to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located if the laser beam is melted through the second sheet 222 during welding. Through setting up flame retardant structure 30, can effectively block the laser beam that leaks through the position of melting through of second lamellar body 222, and then can effectively improve the laser beam radiation to the battery monomer 100 or the adjacent battery monomer 100 at second lamellar body 222 place to can realize the protective effect to the battery monomer 100 or the adjacent battery monomer 100 at flame retardant structure 30 place.

As shown in fig. 3 and 4, the first direction Z is the thickness direction of the housing 10, that is, at least part of the pole 21 is disposed on a wall of the housing 10 along the thickness direction, which is also understood as a large surface of the housing 10, so as to facilitate the disposition of the pole 21 on the housing 10. When the number of the battery cells 100 is plural, the cases 10 of the plural battery cells 100 are generally distributed in sequence in the first direction Z, that is, the thickness directions of the plural cases 10 are parallel to each other, as shown in fig. 5 to 8. Based on this, at least a portion of the pole 21 will typically be located between two adjacent housings 10, making it difficult to achieve welding with the bus bar 300. According to the battery cell 100 provided by the embodiment of the application, at least part of the second sheet 222 extends to the outside of one end of the first shell wall 102 along the direction (the second direction Y) intersecting the first direction Z, so that the second sheet 222 and the first wall 201 of the electrode terminal 20 are both positioned outside of one end of the shell 10 along the direction (the second direction Y) intersecting the first direction Z, and therefore, when in welding, the bus bar 300 does not need to extend between two adjacent shells 10, but the welding of the bus bar 300 and the second sheet 222 can be directly realized outside the shells 10, thereby the welding of the electrode terminal 20 and the bus bar 300 has higher convenience, and further the series connection, the parallel connection or the series-parallel connection among a plurality of battery cells 100 is facilitated.

In some embodiments, referring to fig. 3 and 4, the pole 21 is disposed at an end of the housing 10 along the second direction Y, so that at least a portion of the second sheet 222 of the connecting sheet 22 extends beyond an end of the first housing wall 102 along the second direction Y without using too many connecting sheets 22.

In some embodiments, referring to fig. 3 to 8, the second sheet 222 extends along the first direction Z away from the first housing wall 102, and the flame retardant structure 30 is configured to face the battery cell 100 adjacent to the first housing wall 102.

The second sheet 222 extends along the first direction Z away from the first housing wall 102, specifically, a general extending trend of the second sheet 222 is parallel to the first direction Z, where the second sheet 222 may extend, bend, tilt, etc. along the first direction Z away from the first housing wall 102.

When the housings 10 of the plurality of battery cells 100 are distributed in sequence along the first direction Z, two adjacent battery cells 100 are defined as a first battery cell 100a and a second battery cell 100b, respectively, wherein the second battery cell 100b is disposed adjacent to the first housing wall 102 of the first battery cell 100 a. As shown in fig. 5 to 8, at least a portion of the second sheet 222 of the first battery cell 100a extends beyond one end of the first battery cell 100a in the second direction Y, and is located beyond one end of the second battery cell 100b in the second direction Y, and also faces the second battery cell 100b. The flame retardant structure 30 of the first battery cell 100a is disposed on a side of the second sheet 222 facing the second battery cell 100b, and the first wall 201 of the first battery cell 100a faces away from the second battery cell 100b. In other words, the flame retardant structure 30 faces the battery cell 100 adjacent to the first case wall 102, and the first wall 201 of the second sheet 222 faces away from the adjacent battery cell 100.

By adopting the above technical solution, the first walls 201 of the plurality of battery cells 100 can face away from the battery cell 100 adjacent to the first case wall 102 along the second direction Y, so that the first walls 201 of the plurality of battery cells 100 are oriented substantially similarly, which facilitates the welding operation of the bus bars 300 with the electrode terminals 20 of the two adjacent battery cells 100, respectively.

In addition, the flame retardant structure 30 is disposed on one side of the second sheet 222 facing the battery cell 100 adjacent to the first case wall 102, so that, in the welding process, when the laser beam passes through the second sheet 222, the flame retardant structure 30 can block the laser beam passing through the passing position of the second sheet 222, thereby improving the problem that the laser beam leaks to the battery cell 100 adjacent to the first case wall 102, and further improving the problem that the adjacent battery cell 100 is welded or burned due to the leakage of the laser beam in the welding process.

Fig. 9 shows a partial side view of a battery 1000 provided by other embodiments of the application, and fig. 10 shows a partial enlarged view of fig. 9. In some embodiments, referring to fig. 9 and 10, the second sheet 222 extends along the first direction Z toward the first shell wall 102, and at least a portion of the flame retardant structure 30 is disposed between the second sheet 222 and the housing 10.

Specifically, the second wall 202 of the second sheet 222 faces the housing 10 of the battery cell 100, such that the flame retardant structure 30 faces the housing 10 of the battery cell 100, and the first wall 201 of the second sheet 222 faces away from the housing 10 of the battery cell 100.

By adopting the above technical solution, in the plurality of battery cells 100 arranged along the first direction Z, the first wall 201 may face away from the housing 10 of the battery cell 100, so that the directions of the first walls 201 of the plurality of battery cells 100 are substantially similar, which is convenient for implementing the welding operation of the bus bars 300 with the electrode terminals 20 of the two adjacent battery cells 100, respectively.

In addition, the flame retardant structure 30 is disposed on one side of the second sheet 222 facing the housing 10, so that, in the welding process, when the laser beam passes through the second sheet 222, the flame retardant structure 30 can block the laser beam passing through the passing position of the second sheet 222, thereby improving the problem that the laser beam leaks into the battery cell 100, and further improving the problem that the housing 10 of the battery cell 100 is burned out due to the leakage of the laser beam in the welding process.

In some embodiments, referring to fig. 3 and 4, and fig. 7 and 8, the second sheet 222 is perpendicular to the second direction Y.

At least a portion of the second sheet 222 is located outside one end of the housing 10 along the second direction Y and perpendicular to the second direction Y, when the number of the battery cells 100 is plural, the second sheet 222 of the plurality of battery cells 100 may be parallel to each other, and thus may be disposed flush, in other words, the first walls 201 of the plurality of battery cells 100 may be parallel to each other and flush.

By adopting the above technical solution, the second sheets 222 of the plurality of battery cells 100 can be parallel to each other, that is, the directions of the plurality of second sheets 222 are the same, and the first walls 201 of the plurality of battery cells 100 can be parallel to each other or even flush with each other, so that the bus bars 300 can be welded with the first walls 201 of the adjacent two battery cells 100 respectively, and the bus bars 300 do not need to be bent to adapt the bus bars 300 to the first walls 201 of the adjacent two battery cells 100, which is helpful to simplify the welding operation of the bus bars 300 and the adjacent two electrode terminals 20, so as to simplify the series connection, parallel connection and series-parallel connection between the plurality of battery cells 100.

Fig. 11 shows a partially schematic view of a battery 100 provided in accordance with still other embodiments of the application, and fig. 12 shows a partially enlarged view of fig. 11. In some embodiments, referring to fig. 11 and 12, a side of the first sheet 221 facing the second sheet 222 is also provided with a flame retardant structure 30.

The second sheet 222 extends toward the first wall 102 of the housing 10 or the first wall 102 facing away from the housing 10 along the first direction Z such that one side of the second sheet 222 is disposed toward the first sheet 221. The second wall 202 is disposed on a side of the second sheet 222 facing the first sheet 221, the second wall 202 is provided with the flame retardant structure 30, and the first wall 201 is disposed on a side of the second sheet 222 facing away from the first sheet 221. Accordingly, one side of the first sheet 221 is disposed towards the second sheet 222, and one side of the first sheet 221 towards the second sheet 222 also has the flame retardant structure 30. The portion of the flame retardant structure 30 on the second wall 202 is a first flame retardant member 31, and the portion of the flame retardant structure 30 on the side of the first sheet 221 facing the second sheet 222 is a second flame retardant member 32.

By adopting the above technical solution, the side of the first sheet 221 facing the second wall 202 of the second sheet 222 is also provided with the flame retardant structure 30, so that when the laser beam leaks from the second wall 202 of the second sheet 222, the flame retardant structure 30 on the first sheet 221 can also block the laser beam, and the first flame retardant member 31 and the second flame retardant member 32 can realize dual blocking effects on the laser beam, so as to doubly improve the problem that the laser beam passes through the battery cell 100 or the adjacent battery cell 100.

In some embodiments, referring to fig. 11 and 12, the first flame retardant member 31 and the second flame retardant member 32 are bent and connected.

For example, as shown in fig. 11 and 12, when the first and second sheets 221 and 222 are perpendicular, the first and second flame retardant members 31 and 32 are also perpendicular, so that the first and second flame retardant members 31 and 32 form an "L" shape.

By such arrangement, on one hand, the positioning and fixing of the flame retardant structure 30 on the connecting sheet 22 are facilitated, and on the other hand, the flame retardant structure 30 has a certain supporting effect, so that the fixing effect of the flame retardant structure 30 on the connecting sheet 22 can be maintained.

In some embodiments, referring to fig. 3 to 8, the housing 10 further has a second housing wall 103, the first housing wall 102 and the second housing wall 103 are opposite along a first direction Z; the second case wall 103 is provided with a groove 101, and the groove 101 serves to avoid the electrode terminals 20 of the battery cells 100 adjacent to the second case wall 103.

Wherein, the first shell wall 102 and the second shell wall 103 are wall surfaces of the housing 10. The first housing wall 102 may or may not be parallel to the second housing wall 103. That is, the second housing wall 103 may or may not be perpendicular to the first direction Z.

In some embodiments, referring to fig. 3-8, the first wall 102 is the end cap 12 or is a portion of the end cap 12, and the second wall 103 is a portion of the housing 11. In other embodiments, the first housing wall 102 is part of the housing 11. In still other embodiments, the second housing wall 103 is the end cap 12 or is a portion of the end cap 12.

As shown in fig. 3 and 4, the second housing wall 103 is recessed substantially along the first direction Z to form the groove 101 described above.

On the first case wall 102, a projection of the groove 101 in the first direction Z covers at least part of a projection of the electrode terminal 20 in the first direction Z so that the groove 101 and the electrode terminal 20 correspond in position in the first direction Z. In this way, when the plurality of battery cells 100 are sequentially distributed in the first direction Z, at least a portion of the electrode terminal 20 of one battery cell 100 may enter the groove 101 of the other battery cell 100 in the first direction Z in the adjacent two battery cells 100. In this way, a larger gap between the housings 10 of the two adjacent battery cells 100 does not occur due to the arrangement of the electrode terminals 20, so that the two adjacent battery cells 100 can be close to each other along the first direction Z, and the two adjacent battery cells 100 have higher structural compactness.

In some embodiments, referring to fig. 3 to 8, the groove 101 penetrates one end of the housing 10 along the second direction Y, and the connecting piece 22 may extend out of the housing 10 along the second direction Y through the penetrating portion of the housing 10, so as to facilitate the welding operation between the connecting piece 22 and the bus bar 300.

In some embodiments, referring to fig. 3 and 4, and fig. 7 and 8, the housing 10 has a flange 13, and the second sheet 222 extends out of the flange 13 along the second direction Y.

As shown in fig. 3 and 4, and fig. 7 and 8, the peripheral edge of the opening of the shell 11 of the housing 10 has a first flange, the peripheral edge of the end cap 12 has a second flange, and the first flange and the second flange are fixed by welding or the like to form a flange 13.

By adopting the above technical solution, the second sheet 222 extends to the outside of the flange 13 along the second direction Y, so that the first wall 201 on the second sheet 222 is located outside of one side of the flange 13 along the second direction Y. Based on this, when the bus bar 300 is welded to the first wall 201 of the second sheet 222, the bus bar 300 and the flange 13 may be spaced apart along the second direction Y, so that the bus bar 300 will not crush to damage the flange 13, and further, after the electrode terminal 20 and the bus bar 300 are welded and fixed, the problem that the sealing effect of the case 10 is poor or even fails due to the damage of the flange 13 of the bus bar 300 can be improved.

In some embodiments, the first wall 201 has a weld location for welding with the bus bar 300. The front projection of the flame retardant structure 30 onto the first wall 201 covers the welding location.

The welding position of the first wall 201 is a specific position where the first wall 201 is used to achieve welding with the bus bar 300. It can be understood that, after the bus bar 300 is disposed on the first wall 201 of the electrode terminal 20 and the laser beam is irradiated to the bus bar 300 and the electrode terminal 20, the heat generated by the laser beam is diffused at the welding position of the first wall 201, so that the welding position of the first wall 201 is melted to form a molten pool and fixed with the bus bar 300. That is, the welding position of the first wall 201 is welded to the bus bar 300.

The orthographic projection of the flame retardant structure 30 onto the first wall 201 refers to the projection of the flame retardant structure 30 onto the first wall 201 in a direction perpendicular to the first wall 201 (direction Y). The orthographic projection of the flame retardant structure 30 on the first wall 201 covers the welding position, which means that the flame retardant structure 30 corresponds to the position of the welding position in the direction perpendicular to the first wall 201.

By adopting the above technical scheme, when the laser beam is radiated to the welding position of the first wall 201 of the electrode terminal 20 to realize the welding of the electrode terminal 20 and the bus bar 300, the flame retardant structure 30 covers the welding position, so that the laser beam leaked from the welding position can be better blocked, and further the problem that the battery cell 100 or the adjacent battery cell 100 where the electrode terminal 20 is located is welded through or burned out due to the leakage of the laser beam can be improved.

In some embodiments, at least a portion of the flame retardant structure 30 is secured to the second wall 202.

By such arrangement, the position of the flame retardant structure 30 on the second wall 202 is stable and reliable, so that the flame retardant structure 30 can block the laser beam, thereby improving the problem that the battery cell 100 is welded through.

In some embodiments, referring to fig. 3 to 8, the flame retardant structure 30 is adhered to the electrode terminal 20.

In some embodiments, the first flame retardant 31 of the flame retardant structure 30 is bonded to the second wall 202. In some embodiments, the second flame retardant 32 of the flame retardant structure 30 is adhered to the first sheet 221 of the electrode terminal 20.

Specifically, there is an adhesive layer 40 between the flame retardant structure 30 and the electrode terminal 20. The adhesive layer 40 may be a glue layer such as a structural glue or a double sided glue.

By adopting the above technical scheme, when the flame retardant structure 30 is disposed on the electrode terminal 20, the adhesive layer 40 may be disposed on the flame retardant structure 30, and the side of the flame retardant structure 30 having the adhesive layer 40 is adhered to the electrode terminal 20, so that the fixing process of the flame retardant structure 30 on the electrode terminal 20 is very simple.

In some embodiments, the adhesive layer 40 for bonding the first flame retardant member 31 to the second sheet 222 and the adhesive layer 40 for bonding the second flame retardant member 32 to the first sheet 221 may be connected to each other, as shown in fig. 12, but may be spaced apart.

In some embodiments, the flame retardant structure 30 is a mica structure, a ceramic structure, a glass fiber structure, a carbon-carbon composite piece, a pre-oxidized silk aerogel piece, or the like.

That is, the material of the flame retardant structure 30 may be at least one of mica, ceramic, glass fiber, carbon-carbon composite, and pre-oxidized fiber aerogel.

By adopting the technical scheme, the flame retardant structure 30 is a high-temperature resistant structure with lower heat conductivity coefficient and higher melting point, and has better flame retardant property. During welding, if the laser beam is melted through the electrode terminal 20 and radiated to the flame retardant structure 30, heat generated by the laser beam is difficult to spread inside the flame retardant structure 30 based on the low thermal conductivity and the high melting point of the flame retardant structure 30, so that it is difficult to melt through the flame retardant structure 30. Thus, the laser beam is difficult to leak through the flame retardant structure 30, so that the flame retardant structure 30 has a better effect of blocking the laser beam, and the protection effect on the battery cell 100 or the adjacent battery cell 100 where the flame retardant structure 30 is located can be effectively realized.

In some embodiments, the thermal conductivity of flame retardant structure 30 is less than or equal to 0.7W/mK (watts/meter) ^. Degree).

For example, the thermal conductivity of the flame retardant structure 30 may be 0.7W/mK, 0.65W/mK, 0.6W/mK, 0.55W/mK, 0.5W/mK, etc.

By setting the flame retardant structure 30 to a structure having a smaller thermal conductivity, the flame retardant structure 30 can be made to have a weaker thermal conductivity. During welding, if the laser beam is melted through the electrode terminal 20 and radiated to the flame retardant structure 30, it is difficult for heat generated by the laser beam to be diffused inside the flame retardant structure 30 based on the low thermal conductivity of the flame retardant structure 30, so that it is difficult to melt through the flame retardant structure 30. Thus, the laser beam is difficult to leak through the flame retardant structure 30, so that the flame retardant structure 30 has a better effect of blocking the laser beam, and the protection effect on the battery cell 100 or the adjacent battery cell 100 where the flame retardant structure 30 is located can be effectively realized.

In some embodiments, the melting point of the flame retardant structure 30 is greater than 800 ℃.

For example, the melting point of the flame retardant structure 30 may be 800 ℃, 810 ℃, 820 ℃, 830 ℃, 850 ℃, 900 ℃, 950 ℃, 1000 ℃, etc.

By setting the flame retardant structure 30 to a structure having a large melting point, if the laser beam is melted through the electrode terminal 20 and radiated to the flame retardant structure 30 during welding, the flame retardant structure 30 is difficult to melt under the radiation of the laser beam, that is, the laser beam is difficult to melt through the flame retardant structure 30, based on the high melting point of the flame retardant structure 30. Thus, the laser beam is difficult to leak through the flame retardant structure 30, so that the flame retardant structure 30 has a better effect of blocking the laser beam, and the protection effect on the battery cell 100 or the adjacent battery cell 100 where the flame retardant structure 30 is located can be effectively realized.

Based on the above-mentioned concept, referring to fig. 2 and fig. 5 to fig. 8 together, a second aspect of the present application provides a battery 1000, where the battery 1000 includes a bus bar 300 and a plurality of battery cells 100. The battery cell 100 provided in this embodiment is the same as the battery cell 100 provided in the foregoing embodiment, and specific reference may be made to the description of the battery cell 100 in the foregoing embodiment, which is not repeated herein.

Specifically, the first walls 201 of the electrode terminals 20 of the adjacent two battery cells 100 are welded with the bus bars 300 to achieve series connection or parallel connection through the bus bars 300, and thus series connection, parallel connection or series-parallel connection between the plurality of battery cells 100 can be achieved.

In the battery 1000 according to the embodiment of the present application, due to the adoption of the battery cells 100 according to the embodiment, when the electrode terminals 20 of two adjacent battery cells 100 are welded to the busbar 300, the problem that the battery cells 100 are welded through and burned due to the leakage of the laser beam in the welding process can be also improved, so that the battery 1000 has higher quality.

Based on the above concept, referring to fig. 1, a third aspect of the embodiment of the present application provides an electric device, which includes a battery cell 100 or a battery 1000. The battery cell 100 provided in this embodiment is the same as the battery cell 100 provided in the foregoing embodiment, and specifically, reference may be made to the description of the battery cell 100 in the foregoing embodiment, and the battery 1000 provided in this embodiment is the same as the battery 1000 provided in the foregoing embodiment, and specifically, reference may be made to the description of the battery 1000 in the foregoing embodiment, which is not repeated herein.

The power consumption device provided by the embodiment of the application can also improve the problem that the battery cell 100 is welded through and burned due to the leakage of the laser beam in the welding process because the battery cell 100 or the battery 1000 related to the embodiment is adopted, so that the battery cell 100 has higher quality, and the power consumption device also has higher quality.

As one of the embodiments of the present application, as shown in fig. 3 to 8, the battery cell 100 includes a case 10, an electrode terminal 20, and a flame retardant structure 30. The electrode terminal 20 includes a post 21 and a connection piece 22, and the connection piece 22 includes a first tab 221 and a second tab 222. The second sheet 222 is perpendicular to the first sheet 221, and the second sheet 222 is connected to the first sheet 221. The housing 10 is provided with a first housing wall 102 and a second housing wall 103 on opposite sides of the first direction Z, the pole 21 is provided on the first housing wall 102, and the second housing wall 103 is provided with a groove 101. The first plate 221 is connected to the pole 21. The second sheet 222 has a first wall 201 and a second wall 202 on opposite sides in the thickness direction, respectively. The first flame retardant member 31 of the flame retardant structure 30 is disposed on the second wall 202 of the second sheet 222, and the second flame retardant member 32 of the flame retardant structure 30 is disposed on a side of the first sheet 221 facing the second sheet 222. And, at least part of the second sheet 222 extends beyond the first wall 102 of the housing 10 along the second direction Y.

When the plurality of battery cells 100 are sequentially distributed along the first direction Z, at least a portion of the electrode terminals 20 of the first battery cell 100a of the two adjacent battery cells 100 extend into the grooves 101 of the second battery cell 100b along the first direction Z, the first flame retardant 31 of the first battery cell 100a is opposite to the second battery cell 100b, and the first wall 201 of the first battery cell 100a is flush with the first wall 201 of the second battery cell 100 b.

Based on this, when the bus bar 300 is welded to the electrode terminals 20 of the adjacent two battery cells 100, the bus bar 300 may be disposed on the first walls 201 of the adjacent two second sheets 222 and form welding with the two second sheets 222. When the laser beam leaks during the welding process, the flame retardant structure 30 may block the laser beam, improving the problem of the laser beam leaking to the adjacent battery cell 100.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims

1. A battery cell, comprising:

a housing;

an electrode terminal provided to the case; the electrode terminal has opposite first and second walls, the first wall being for welding with a bus bar;

And a flame retardant structure at least partially located on a side of the second wall remote from the first wall.

2. The battery cell of claim 1, wherein the electrode terminal comprises a post and a connecting piece connected to the post, the post is disposed on the housing, and the first wall and the second wall are disposed on opposite sides of the connecting piece, respectively.

3. The battery cell of claim 2, wherein the connecting tab comprises a first tab and a second tab bent to connect to the first tab, the first tab connected to the post; the first wall and the second wall are respectively arranged on two opposite sides of the second lamellar body.

4. The battery cell of claim 3, wherein the housing has a first housing wall in a first direction, the post is disposed on the first housing wall, at least a portion of the second tab is disposed outside an end of the first housing wall in a second direction, the first direction intersects the second direction, and the first direction is perpendicular to the first housing wall.

5. The battery cell of claim 4, wherein the second tab extends in the first direction away from the first housing wall and the flame retardant structure is configured to face the battery cell adjacent the first housing wall.

6. The battery cell of claim 4, wherein the second tab extends in the first direction toward the first housing wall, and at least a portion of the flame retardant structure is disposed between the second tab and the housing.

7. The battery cell of claim 3, wherein a side of the first sheet facing the second sheet is provided with the flame retardant structure.

8. The battery cell of claim 4, wherein the housing further has a second housing wall, the first housing wall and the second housing wall being opposite in the first direction Z; the second case wall is provided with a groove for avoiding the electrode terminal of the battery cell adjacent to the second case wall.

9. The battery cell of any one of claims 1-8, wherein the first wall has a weld location for welding with the buss bar, an orthographic projection of the flame retardant structure on the first wall covering the weld location.

10. The battery cell of any one of claims 1-8, wherein at least a portion of the flame retardant structure is secured to the second wall.

11. The battery cell of any one of claims 1-8, wherein the flame retardant structure is a mica structure, a ceramic structure, a fiberglass structure, a carbon fiber structure, a carbon-carbon composite piece, or a pre-oxidized silk aerogel piece.

12. The battery cell of any one of claims 1-8, wherein the flame retardant structure has a thermal conductivity of 0.7W/m-K or less; and/or the melting point of the flame retardant structure is greater than 800 ℃.

13. A battery, comprising:

a busbar;

a plurality of the battery cells according to any one of claims 1 to 12, the first walls of the electrode terminals of adjacent two of the battery cells being welded to the bus bar.

14. An electrical device comprising a battery cell according to any one of claims 1-12, or comprising a battery according to claim 13.