CN215989064U

CN215989064U - Battery cell, battery and power consumption device

Info

Publication number: CN215989064U
Application number: CN202122355181.8U
Authority: CN
Inventors: 吴怡祯
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-03-08
Anticipated expiration: 2031-09-27

Abstract

The application relates to a battery monomer, battery and power consumption device belongs to battery manufacturing technical field. The application provides a battery monomer, includes: a housing having an opening; the electrode assembly is arranged in the shell and comprises a main body and two lugs with opposite polarities, and the two lugs are arranged on one side of the main body away from the opening; the end cover assembly comprises a cover body and two electrode terminals with opposite polarities, the two electrode terminals are arranged on the cover body, and the cover body is used for covering the opening; two current collecting members, each of which is configured to connect the tab of the same polarity with the electrode terminal. The battery cell has better safety performance when being used in an inverted mode. The application also provides a battery and an electric device, comprising the battery monomer.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

With the rapid rise of the new energy automobile industry, the technical level of the power battery is also rapidly improved, and how to improve the safety performance of the power battery is one of the main research and development trends of the power battery technology.

At present, the safety performance of the power battery can be improved by placing the power battery upside down for use. Based on the internal structure of the existing power battery, if the power battery is directly used in an inverted mode, certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

Therefore, the application provides a battery cell, a battery and an electric device, which can have better safety performance when being used in an inverted mode.

An embodiment of a first aspect of the present application provides a battery cell, including: a housing having an opening; the electrode assembly is arranged in the shell and comprises a main body and two lugs with opposite polarities, and the two lugs are arranged on one side of the main body away from the opening; the end cover assembly comprises a cover body and two electrode terminals with opposite polarities, the two electrode terminals are arranged on the cover body, and the cover body is used for covering the opening; two current collecting members, each of which is configured to connect the tab of the same polarity with the electrode terminal.

Because utmost point ear sets up in the one side of keeping away from the open-ended of main part, the lid is located the downside of casing when the battery monomer is invertd and is used, and utmost point ear is located the upside of main part, and the weight of main part can not oppress utmost point ear, can avoid utmost point ear to insert the main part and lead to the inside short circuit that takes place of battery monomer. The battery cell in the embodiment of the application is allowed to be used in an inverted mode and has better safety performance.

According to some embodiments of the application, the casing includes diapire and lateral wall, the lid connect in the lateral wall, the diapire with the opening sets up relatively, the mass flow component includes terminal connecting portion, transition portion and utmost point ear connecting portion, terminal connecting portion set up in the lid with between the main part and with electrode terminal connects, utmost point ear connecting portion set up in the diapire with between the main part and with utmost point ear connects, transition portion set up in the lateral wall with between the main part and connect terminal connecting portion with utmost point ear connecting portion.

In the scheme, the terminal connecting part and the lug connecting part occupy smaller space, and the increase amplitude of the external size of the battery monomer caused by arrangement of the current collecting component can be reduced, so that the battery monomer is compact in structure and has better energy density.

According to some embodiments of the present application, the terminal connection part and the tab connection part extend from both ends of the transition part to the same side, respectively.

In the scheme, the terminal connecting part and the lug connecting part are positioned on the same side of the transition part, so that the outer size of the current collecting component can be reduced, and the amplitude of the increase of the outer size of the battery monomer caused by arrangement of the current collecting component is reduced, so that the battery monomer is compact in structure and has better energy density.

According to some embodiments of the application, the cover is rectangular, and the transition portion is disposed between the main body and the side wall along a length direction of the cover.

In the above scheme, the transition portion occupies a small space, and the increase of the external size of the battery cell in the width direction of the cover body can be avoided, so that the increase of the external size of the battery cell caused by the arrangement of the current collecting member can be reduced, the structure of the battery cell is compact, and the battery cell has good energy density.

According to some embodiments of the present application, the tab connection part includes a first portion including a first edge connected with the transition part and a second edge connected with the second portion, and the transition part and the second portion are respectively located at both sides of the first portion in a thickness direction of the first portion.

In the above scheme, along the thickness direction of the first part, the transition part and the second part are respectively located on two sides of the first part, so that the outer size of the current collecting member can be reduced, the increase amplitude of the outer size of the battery cell caused by arrangement of the current collecting member is reduced, the battery cell is compact in structure, and the energy density is better.

According to some embodiments of the application, the first edge and the second edge are perpendicular to each other.

In the above scheme, the first edge and the second edge are perpendicular to each other, so that the second part can be formed by extending the side edge of the first part, and the second part is easy to connect with the tab and bend.

According to some embodiments of the present application, the second portion and the tab are bent toward the first portion along the second edge, the second portion being located between the tab and the main body.

In the scheme, the second part and the tab are bent towards the first part along the second edge, so that the second part and the tab can be bent simultaneously, and the bending steps of the second part and the tab are simplified; and the second part is positioned between the tab and the main body, so that the tab can be prevented from being deformed and separated from the second part due to the fact that the tab is extruded by the second part and the first part together.

According to some embodiments of the present application, the battery cell includes two of the electrode assemblies, which are stacked; the tab connecting part includes two second portions disposed at opposite sides of the first portion, respectively, and the two second portions are connected with two tabs of the same polarity of the electrode assembly, respectively.

In the scheme, the second part corresponds to the lugs of one electrode assembly one by one, so that the lug connecting part can be fully connected with the lugs of the two electrode assemblies, and the overcurrent capacity of the current collecting component is improved.

According to some embodiments of the present application, the battery cell further comprises: and the insulating film is coated on the lug and the second part so as to insulate and separate the lug and the bottom wall.

In the scheme, the lug and the second part are connected into a whole and are coated by the insulating film, the bent lug is isolated from the bottom wall through the insulating film in an insulating way, the lug can be prevented from being conductively connected with the bottom wall of the shell, and therefore the safety performance of the battery monomer is improved.

According to some embodiments of the present application, the battery cell further comprises: and a first insulating member disposed between the bottom wall and the electrode assembly for insulating and isolating the bottom wall and the electrode assembly.

In the above scheme, the first insulating member is used for insulating and isolating the bottom wall and the electrode assembly, so that the tab can be further prevented from being conductively connected with the bottom wall of the shell, and the safety performance of the battery cell is improved.

According to some embodiments of the present application, the end cap assembly further comprises a pressure relief portion disposed on the cover.

In the above scheme, the pressure relief portion is arranged on the cover body, when the single battery is used in an inverted mode, the cover body is located on the lower side of the shell, the pressure relief portion is located on the lower side of the single battery, and when the pressure relief portion is actuated, high-temperature and high-pressure gas is sprayed downwards, so that the single battery has good safety performance.

An embodiment of the second aspect of the present application provides a battery, including: a box body; in the single battery cell according to the embodiment of the first aspect of the present application, the single battery cell is disposed inside the box body; the thermal management component is arranged in the box body and positioned at the bottom of the battery cell, and the thermal management component is configured to support the cover body of the battery cell.

The cover body of the battery monomer is supported by the heat management component, so that the battery monomer can be used in an inverted mode. Due to the characteristics of the single battery provided by the embodiment of the first aspect of the present application, the battery provided by the embodiment of the second aspect of the present application has better safety performance when being used upside down.

In a third aspect of the present application, an electrical device is provided, which includes the battery of the second aspect of the present application.

Due to the above characteristics of the battery proposed in the second aspect of the present application, the electric device proposed in the third aspect of the present application has better safety performance.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 illustrates a simplified schematic view of a vehicle according to some embodiments of the present application;

FIG. 2 is a schematic diagram of the battery of the vehicle of FIG. 1;

fig. 3 illustrates an exploded view of a battery cell according to some embodiments of the present application;

fig. 4 shows a schematic diagram of a battery cell according to some embodiments of the present application (housing not shown);

fig. 5 shows an exploded view of a battery cell (housing and electrode assembly not shown) according to some embodiments of the present application;

fig. 6 illustrates a cross-sectional view of an XZ plane of a battery cell of some embodiments of the present application;

FIG. 7 is a schematic structural view of a first form of current collecting member of an embodiment of the present application;

FIG. 8 is a schematic structural view of a second form of current collecting member of an embodiment of the present application;

fig. 9 and 10 are schematic structural views of a tab and a second portion of a battery cell according to some embodiments of the present application before and after bending, respectively;

fig. 11 is a schematic structural view illustrating a tab and a second portion of a battery cell of some embodiments of the present application are bent and then coated with an insulating film.

Icon: 1000-a vehicle; 100-a battery; 10-a battery cell; 11-a housing; 111-a bottom wall; 112-a side wall; 1121 — a first side wall; 1122-a second side wall; 1123-a third sidewall; 1124-a fourth side wall; 113-an opening; 12-an end cap assembly; 121-a cover; 1211-electrode extraction aperture; 122-electrode terminals; 123-a pressure relief portion; 13-an electrode assembly; 131-a body; 132-a tab; 14-a current collecting member; 141-terminal connection parts; 142-a transition portion; 1421 — first end; 1422 — second end; 143-tab connection; 1431-first part; 14311 — first edge; 14312 — a second edge; 14313-third edge; 1432-second part; 15-an insulating film; 16-a first insulator; 17-discharging plastic; 171-a seal; 18-coating plastic; 19-riveting block; 20-a box body; 30-a thermal management component; 200-a controller; 300-motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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 above figures 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 one skilled in the art that the embodiments described herein can be combined with other embodiments.

Throughout the description of the present application, it is to be noted that unless otherwise expressly specified or limited the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be 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 two types in an encapsulation manner: square battery monomer and laminate polymer battery monomer.

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. The battery generally includes a case for enclosing one or more battery cells, and the case prevents liquid or other foreign materials from affecting the charge or discharge of the battery cells.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. 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 active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly 13 may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell further comprises a pressure relief portion which is actuated when the internal pressure of the battery cell 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 of the battery cell. The pressure relief portion may take the form of, for example, an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or configuration, that is, when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief portion performs an action or a weak structure provided in the pressure relief portion is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be relieved.

The term "activate" as used herein means that the pressure relief portion is activated or activated to a certain state, so that the internal pressure and temperature of the battery cell are released. The action produced by the pressure relief portion may include, but is not limited to: at least a portion of the pressure relief portion ruptures, fractures, is torn or opened, or the like. When the pressure relief portion is actuated, high-temperature and high-pressure substances inside the battery cell are discharged as discharge from the opened portion. In this way, the battery cells can be decompressed and warmed under the condition of controllable pressure or temperature, so that the potential more serious accidents are avoided.

The battery unit further comprises a current collecting member for electrically connecting the tab of the battery unit and the electrode terminal to transmit electric energy from the electrode assembly to the electrode terminal and to the outside of the battery unit through the electrode terminal; the plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells. The current collecting component can be made of copper, alloy and other metals with better conductivity.

The battery also includes a thermal management component for regulating the temperature of the battery cells, where "regulating the temperature" is heating or cooling the battery cells. For example, the thermal management component is used to contain a fluid to regulate the temperature of the battery cell, where the fluid may be a liquid or a gas, such as water, a mixture of water and glycol, or air, among others.

In the related art, the pressure relief portion is actuated to release the temperature or pressure inside the battery cell when the pressure inside the battery cell reaches a threshold value. Since the high-temperature and high-pressure gas is ejected from the relief portion, it easily enters the passenger compartment, burns passengers, and causes a fire. In order to improve the safety performance of the battery cell, there is a battery cell that is used upside down, and the pressure relief portion is located at the bottom of the battery cell, and when the pressure relief portion 123 is actuated, the high-temperature and high-pressure gas is ejected toward the lower side, and does not cause damage to the passenger compartment.

The inventor finds that based on the internal structure of a mainstream battery cell at present, the electrode lugs with two polarities and the pressure relief portion are arranged on the same side, so that the electrode assembly can be fully infiltrated by electrolyte, and the battery cell has high stability and reliability. If further improve the free security performance of battery of this kind of structural style, make the relief pressure portion be located the free bottom of battery, then utmost point ear also is located the free bottom of battery, will oppress utmost point ear downwards under electrode subassembly's self gravity, may lead to utmost point ear to insert electrode subassembly's inside, leads to the inside short circuit that takes place of battery monomer, leads to the incident. If the arrangement position of the pole lug can be changed, the pole lug and the pressure relief part are arranged on different sides, the pole lug can be prevented from being pressed when the battery is arranged in an inverted mode, and the problems are solved.

Based on the thought, this application provides a new technical scheme, makes battery monomer also possess better security performance when inverting the use.

It is understood that "right position" of the battery cell refers to the placing posture of the battery cell when the pressure relief portion is arranged upward; the "inversion" of the battery cell refers to the placement of the battery cell when the pressure relief portion is disposed downward.

It is to be understood that the electric device using the battery cell or the battery described in the embodiment of the present application may be in various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like.

The battery cell and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may be applied to all electric devices using the battery cell and the battery.

FIG. 1 illustrates a simplified schematic view of a vehicle according to some embodiments of the present application; fig. 2 shows a schematic diagram of the battery of the vehicle in fig. 1.

As shown in fig. 1, a battery 100, a controller 200, and a motor 300 are provided inside a vehicle 1000, and the battery 100 may be provided, for example, at the bottom or the front or rear of the vehicle 1000. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used to power vehicle 1000, for example, battery 100 may be the operating power source for vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operation power demand at the start, navigation, and traveling of the vehicle 1000.

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

Here, the battery 100 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 is formed by connecting a plurality of battery cells 10 in series or in parallel.

As shown in fig. 2, the battery 100 includes a plurality of battery cells 10, a case 20, and a thermal management member 30, and the plurality of battery cells 10 are placed in the case 20.

One or more battery cells 10 may be used. If there are a plurality of battery cells 10, the plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 10 are connected in series or in parallel. A plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel to form a battery 100 module, and a plurality of battery 100 modules may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case 20; or all the single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by all the single batteries 10 is accommodated in the box 20. The battery 100 may further include a bus bar, and the plurality of battery cells 10 may be electrically connected to each other through the bus bar, so as to connect the plurality of battery cells 10 in series, in parallel, or in series-parallel. The bus member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

As shown in fig. 2, the case 20 includes a first case and a second case (only a part of the case is shown in fig. 2), the first case and the second case cover each other to form a battery cavity, and the plurality of battery cells 10 are placed in the battery 100 cavity. The shape of the first case and the second case may be determined according to the shape of the combination of the plurality of battery cells 10, and the first case and the second case may each have one opening. For example, the first box and the second box can be hollow cuboids, only one surface of each box is an opening surface, the openings of the first box and the second box are oppositely arranged, and the first box and the second box are mutually buckled to form the box 20 with a closed cavity. The plurality of battery cells 10 are connected in parallel or in series-parallel combination and then are placed in a box body 20 formed by buckling a first box body and a second box body.

The thermal management member 30 is disposed inside the case 20, and the thermal management member 30 may be mounted to the first case or the second case; the thermal management member 30 may be a flat plate or a plurality of strip structures connected to form the thermal management member 30, and the thermal management member 30 is used to attach to the outer surface of the battery cell 10 to conduct heat to the battery cell 10 or take heat away from the battery cell 10.

Fig. 3 illustrates an exploded view of a battery cell according to some embodiments of the present application; fig. 4 shows a schematic diagram of a battery cell according to some embodiments of the present application (housing not shown); fig. 5 shows an exploded view of a battery cell (housing and electrode assembly not shown) according to some embodiments of the present application.

As shown in fig. 3, 4 and 5, the battery cell 10 includes a case 11, an end cap assembly 12, an electrode assembly 13, and a current collecting member 14.

Specifically, the case 11 is a square-can battery 100, the case 11 is hexahedral, and the case 11 forms a receiving cavity therein for receiving the electrode assembly 13 and the electrolyte. One end of the case 11 has an opening 113 so that the electrode assembly 13 can be placed inside the case 11 through the opening 113. The housing 11 may be made of a metal material such as aluminum, aluminum alloy, or nickel-plated steel.

The end cap assembly 12 includes a cap body 121, two electrode terminals 122 having opposite polarities, and a pressure relief portion 123. The lid 121 serves to cover the opening 113 of the case 11 to enclose the electrode assembly 13 inside the case 11. The cover 121 is made of a metal material, such as aluminum, steel, etc.

As shown in fig. 3, 4 and 5, the electrode assembly 13 is disposed inside the case 11, and the electrode assembly 13 includes a main body 131 and two tabs 132 of opposite polarities. The main body 131 includes a positive electrode plate, a negative electrode plate, and an isolation film located between the positive electrode plate and the negative electrode plate for isolating the positive electrode plate from the negative electrode plate.

In some embodiments of the present application, the electrode assembly 13 may be a winding type structure in which a winding axis is parallel to the first direction X. In other embodiments, the electrode assembly 13 may also be a laminated structure that is stacked in the third direction Y.

The cover 121 is flat, and the size and shape of the cover 121 match the opening 113 of the housing 11. The pressure relief portion 123 is configured to be activated when the internal pressure of the battery cell 10 reaches a threshold value, so that the internal pressure and temperature of the battery cell 10 are relieved.

The lid 121 is provided with two electrode lead-out holes 1211, and the two electrode terminals 122 are provided in the two electrode lead-out holes 1211 of the lid 121. One of the two electrode terminals 122 is a positive electrode terminal 122, and the other is a negative electrode terminal 122. One of the two tabs 132 is a positive tab 132, and the other is a negative tab 132. The electrode terminal 122 of the positive electrode and the positive electrode tab 132 of the electrode assembly 13 are electrically connected through one current collecting member 14, and the electrode terminal 122 of the negative electrode and the negative electrode tab 132 of the electrode assembly 13 are electrically connected through the other current collecting member 14.

In the battery cell 10 of some embodiments of the present application, the battery cell 10 includes a case 11, an electrode assembly 13, an end cap assembly 12, and two current collecting members 14. The case 11 has an opening 113, the electrode assembly 13 is disposed inside the case 11, the electrode assembly 13 includes a main body 131 and two tabs 132 with opposite polarities, and the two tabs 132 with opposite polarities are disposed on one side of the main body 131 far away from the opening 113; the end cap assembly 12 includes a cap 121 and two electrode terminals 122 with opposite polarities, the two electrode terminals 122 with opposite polarities are disposed on the cap 121, and the cap 121 is used for covering the opening 113; the current collecting member 14 is configured to connect the tab 132 and the electrode terminal 122 of the same polarity.

Specifically, the battery cell 10 has a hexahedral shape, the housing 11 has a longitudinal direction extending in the first direction X, a height direction extending in the second direction Z, a thickness direction extending in the third direction Y, and an opening 113 is provided at one side of the housing 11 in the second direction Z. The cap 121 has a length direction extending in the first direction X, a width direction extending in the third direction Y, and a thickness direction extending in the second direction Z, and the cap 121 covers the opening 113 of the case 11 to enclose the electrode assembly 13 inside the case 11. Along the second direction Z, a tab 132 with positive polarity and a tab 132 with negative polarity are disposed on one side of the main body 131 close to the cover 121, and the tab 132 with positive polarity and the tab 132 with negative polarity are disposed at intervals along the first direction X. The positive electrode terminal 122 and the negative electrode terminal 122 are also disposed at intervals along the first direction X on the cover 121, and the electrode terminal 122 and the tab 132 of the same polarity are located on the same side of the main body 131 along the first direction X and are connected by one current collecting member 14.

The battery cell 10 may include one electrode assembly 13, or may include two or more electrode assemblies 13, where the two or more electrode assemblies 13 are stacked, and the tabs 132 of the two or more electrode assemblies 13 having the same polarity are disposed on the same side. Projections of the tabs 132 of the two or more electrode assemblies 13 with the same polarity on the XZ plane may or may not completely overlap each other.

The surface of the body 131 may be coated with a film or a glue layer having an insulating function to further insulate the surface of the body 131 from direct contact with the case 11, the cap 121, the current collecting member 14, the electrode terminal 122, and the like.

One end of the current collecting member 14 is located at one side of the body 131 close to the cover 121, the other end is located at one side of the body 131 close to the tab 132, and the cover 121 and the tab 132 are located at both sides of the body 131 along the second direction Z, respectively. The current collecting member 14 may bypass the body 131 in the first direction X to connect the electrode terminal 122 and the tab 132, and may also bypass the body 131 in the third direction Y to connect the electrode terminal 122 and the tab 132.

The single battery 10 further includes a pressure relief portion 123, the pressure relief portion 123 is located between the two electrode terminals 122 and penetrates through the cover 121 along the second direction Z, and the pressure relief portion 123, the electrode terminals 122 and the tab 132 are located on the same side of the main body 131.

As shown in fig. 5, the battery cell 10 further includes two upper plastics 18, two lower plastics 17, and two riveting blocks 19. The upper plastic 18, the lower plastic 17, the riveting block 19, the electrode terminal 122 and the current collecting member 14 correspond to each other one by one. The electrode terminal 122 and the riveting block 19 are respectively located on two sides of the cover 121 along the second direction Z, and the electrode terminal 122 and the sealing member 171 are sequentially, insulatively and penetratingly arranged on the lower plastic 17 and the cover 121, and are connected with the riveting block 19 in a riveting manner. The surface of the riveting block 19 away from the cover 121 is provided with a mounting groove, the upper plastic 18 is embedded in the mounting groove, and the upper plastic 18 is provided with a via hole corresponding to the electrode lead-out hole 1211, so that one end of the electrode terminal 122 is exposed out of the single battery 10.

Because the tab 132 is disposed on the side of the main body 131 far away from the opening 113, when the battery cell 10 is used upside down, the cover 121 is located on the lower side of the housing 11, the tab 132 is located on the upper side of the main body 131, the weight of the main body 131 does not press the tab 132, and the tab 132 is prevented from being inserted into the main body 131 to cause a short circuit inside the battery cell 10. The battery cell 10 in the embodiment of the present application allows inverted use and has better safety performance.

Fig. 6 illustrates a cross-sectional view of an XZ plane of a battery cell of some embodiments of the present application; fig. 7 is a schematic structural view of a first form of current collecting member of an embodiment of the present application.

As shown in fig. 3, 6 and 7, in some embodiments of the present disclosure, the housing 11 includes a bottom wall 111 and a side wall 112, the cover 121 is connected to the side wall 112, and the bottom wall 111 is disposed opposite to the opening 113. The current collecting member 14 includes a terminal connection portion 141, a transition portion 142, and a tab connection portion 143, the terminal connection portion 141 being disposed between the cover 121 and the main body 131 and connected to the electrode terminal 122, the tab connection portion 143 being disposed between the bottom wall 111 and the main body 131 and connected to the tab 132, the transition portion 142 being disposed between the side wall 112 and the main body 131 and connecting the terminal connection portion 141 and the tab connection portion 143.

As shown in fig. 3, specifically, the battery cell 10 is a square-casing battery 100, the side wall 112 includes a first side wall 1121, a second side wall 1122, a third side wall 1123, and a fourth side wall 1124, the first side wall 1121 and the second side wall 1122 are oppositely disposed along a first direction X, the third side wall 1123 and the fourth side wall 1124 are oppositely disposed along a third direction Y, the cover 121 and the bottom wall 111 are oppositely disposed along a second direction Z, and the first direction X, the second direction Z, and the third direction Y are perpendicular to each other two by two.

The thickness direction of the terminal connection part 141 and the tab connection part 143 may extend in the second direction Z, and the thickness direction of the transition part 142 may extend in the first direction X or in the third direction Y.

The terminal connection portion 141, the transition portion 142, and the tab connection portion 143 may be separately provided and connected in sequence, or both ends of the transition portion 142 may be bent and extended to form the terminal connection portion 141 and the tab connection portion 143, respectively.

In the above-described aspect, the terminal connection part 141 and the tab connection part 143 occupy a small space, and the increase in the outer size of the battery cell 10 due to the arrangement of the current collecting member 14 can be reduced, so that the battery cell 10 is compact in structure and has a good energy density.

In some embodiments of the present application, the terminal connection part 141 and the tab connection part 143 extend from both ends of the transition part 142 to the same side, respectively.

As shown in fig. 7, specifically, two ends of the transition portion 142 in the second direction Z are a first end 1421 and a second end 1422, respectively, the first end 1421 is disposed near the cover 121, the second end 1422 is disposed near the bottom wall 111, the first end 1421 extends to form the terminal connection portion 141, and the second end 1422 extends to form the tab connection portion 143. The terminal connection part 141 and the tab connection part 143 are located on the same side of the transition part 142 along the first direction X or the third direction Y.

In other embodiments, the terminal connection part 141 and the tab connection part 143 may be respectively located at both sides of the transition part 142 along the third direction Y to accommodate a larger distance between the tab 132 and the electrode terminal 122 along the first direction X, and also to reduce the width dimension of the transition part 142 in the first direction X, reducing the weight of the current collecting member 14.

The terminal connection part 141 and the tab connection part 143 are located on the same side of the transition part 142, which can reduce the outer size of the current collecting member 14 and reduce the increase in the outer size of the battery cell 10 due to the arrangement of the current collecting member 14, thereby making the battery cell 10 compact in structure and having better energy density.

In some embodiments of the present disclosure, the cover 121 is rectangular, and the transition portion 142 is disposed between the main body 131 and the sidewall 112 along the length direction of the cover 121.

Specifically, the longitudinal direction of the cover 121 extends in the first direction X, and based on the embodiment described above in which "the side wall 112 includes the first side wall 1121, the second side wall 1122, the third side wall 1123, and the fourth side wall 1124", the transition portion 142 of one of the two current collecting members 14 is disposed between the first side wall 1121 and the main body 131, and the transition portion 142 of the other one is disposed between the second side wall 1122 and the main body 131. That is, the transition portions 142 of the two current collecting members 14 are located at both sides of the main body 131 in the first direction X, respectively, to provide arrangement space for the current collecting members 14 by increasing the outer size of the battery cell 10 in the first direction X.

The width dimension of the transition portion 142 along the third direction Y may be the same as the thickness dimension of the main body 131, or may be smaller than the thickness dimension of the main body 131. In the third direction Y, the transition portion 142 is disposed centrally with respect to the main body 131, and may be disposed offset from the middle of the main body 131.

In other embodiments, the transition portion 142 of one of the two current collecting members 14 is disposed between the third sidewall 1123 and the main body 131, and the transition portion 142 of the other one of the two current collecting members 14 is disposed between the fourth sidewall 1124 and the main body 131, and the transition portions 142 of the two current collecting members 14 are respectively located on the same side of the main body 131 in the third direction Y, to provide an arrangement space for the current collecting members 14 by increasing the outer dimension of the battery cell 10 in the third direction Y.

In the above-described aspect, the transition portion 142 occupies a smaller space, and an increase in the outer dimension of the battery cell 10 in the width direction of the lid body 121 can be avoided, so that the magnitude of the increase in the outer dimension of the battery cell 10 due to the arrangement of the current collecting member 14 can be reduced, and the battery cell 10 can be made compact and have a better energy density.

It is to be understood that in the battery cell 10 of the embodiment of the present application, the electrode terminals 122, the tabs 132, and the current collecting members 14 correspond to one another, and for convenience of description, the specific configuration, the position relationship, and the connection relationship of the current collecting members 14 are explained in detail below based on the transition portion 142 disposed between the first side wall 1121 and the main body 131.

As shown in fig. 7, in some embodiments of the present application, the tab connection part 143 includes a first portion 1431 and a second portion 1432, the first portion 1431 includes a first edge 14311 and a second edge 14312, the first edge 14311 is connected with the transition part 142, the second edge 14312 is connected with the second portion 1432, and the transition part 142 and the second portion 1432 are respectively located at both sides of the first portion 1431 in a thickness direction of the first portion 1431.

The first portion 1431 and the second portion 1432 may be integrally formed, or may be separately disposed and connected by welding or conductive adhesion. The first and

second portions

1431 and 1432 may be the same in material, so that the tab connection part 143 has the same conductive performance and strength; the material of the first portion 1431 and the second portion 1432 may also be different, making the second portion 1432 easier to bend. The first portion 1431 may be a square or elongated shape; the second portion 1432 may be rectangular in shape, or may be semi-circular or other shape.

Second end 1422 of transition portion 142 is connected to first edge 14311 of first portion 1431. The first edge 14311 extends in the third direction Y, and enables the transition portion 142 and the tab connection portion 143 to be attached and a corner of the main body 131 near the bottom wall 111 and near the first side wall 1121 to compactly couple the current collecting member 14 with the electrode assembly 13.

The first edge 14311 and the second edge 14312 may be vertically disposed, and the second portion 1432 is formed by the first portion 1431 extending along the third direction Y; the first edge 14311 and the second edge 14312 may also be arranged in parallel, the second portion 1432 being formed by the first portion 1431 extending in the first direction X.

The transition portion 142 and the second portion 1432 are respectively located at both sides of the first portion 1431 in the thickness direction of the first portion 1431, and it is possible to reduce the outer size of the current collecting member 14, and to reduce the magnitude of increase in the outer size of the battery cell 10 due to the arrangement of the current collecting member 14, thereby making the battery cell 10 compact with a better energy density.

In some embodiments of the present application, the first edge 14311 is perpendicular to the second edge 14312.

As shown in fig. 7, specifically, the thickness directions of the first portion 1431 and the second portion 1432 extend in the second direction Z, the first edge 14311 extends in the third direction Y, and the second edge 14312 extends in the first direction X. The first portion 1431 is square or elongated, the first edge 14311 is an end edge of the first portion 1431, and the second edge 14312 is a side edge of the first portion 1431.

The first edge 14311 and the second edge 14312 are perpendicular to each other, so that the second portion 1432 is formed by extending the side edge of the first portion 1431, and the second portion 1432 is easily connected with the tab 132 and is easily bent.

In some embodiments of the present application, the second portion 1432 and the tab 132 are bent toward the first portion 1431 along the second edge 14312, and the second portion 1432 is located between the tab 132 and the main body 131.

The second portion 1432 and the tab 132 are welded in an ultrasonic welding manner to form a tab 132 assembly, the tab 132 assembly is bent towards the first portion 1431 along the second edge 14312, so that the thickness direction of the tab 132 assembly extends along the second direction Z, and the tab 132 assembly is attached to the bottom of the main body 131 to occupy a small space.

After the tab 132 assembly is bent towards the first part 1431, the second part 1432 is stacked with the tab 132, and the area of the tab 132 is smaller than that of the second part 1432, so that the tab 132 can be completely attached to the second part 1432, and a sufficient flow area is ensured between the tab 132 and the tab connecting part 143.

The second part 1432 and the tab 132 are both bent towards the first part 1431 along the second edge 14312, so that the second part 1432 and the tab 132 can be simultaneously bent, and the bending steps of the second part 1432 and the tab 132 are simplified; after the tab 132 assembly is bent towards the first part 1431, the second part 1432 is located between the tab 132 and the first part 1431, so that the bending degree of the tab 132 can be reduced, and excessive bending and breaking of the tab 132 are avoided; it is also possible to expose the tab 132 to the outside of the electrode assembly 13, and to prevent the tab 132 from being deformed and separated from the second portion 1432 by excessively pressing the tab 132.

Fig. 8 shows a schematic structural view of a current collecting member of a second form of the embodiment of the present application.

As shown in fig. 3 and 8, in some embodiments of the present application, the battery cell 10 includes two electrode assemblies 13, the two electrode assemblies 13 being stacked; the tab connection part 143 includes two second portions 1432, the two second portions 1432 are respectively disposed at opposite sides of the first portion 1431, and the two second portions 1432 are respectively connected to the tabs 132 of the same polarity of the two electrode assemblies 13.

Specifically, the two electrode assemblies 13 are stacked in the third direction Y, the tabs 132 of the same polarity of the two electrode assemblies 13 are located on the side of the respective main body 131 close to the bottom wall 111, and the projections of the tabs 132 of the same polarity of the two electrode assemblies 13 on the XZ plane are overlapped. The tabs 132 of the two electrode assemblies 13 of the same polarity are located at sides of the two electrode assemblies 13, which are away from each other, respectively, in the third direction Y. The thickness direction of the first portion 1431 of the tab connection part 143 extends along the second direction Y, two sides of the first portion 1431 in the third direction Y are respectively provided with a second portion 1432, the first portion 1431 is located between two tabs 132 of the same polarity in the third direction, the two second portions 1432 are located at one side of the two tabs 132 away from each other, each tab 132 is connected with the second portion 1432 of the same side to form a tab 132 assembly, and the two assemblies are bent towards one side close to each other, so that the thickness directions of the tab 132 and the second portion 1432 extend along the second direction Z.

The two second portions 1432 may be aligned in the first direction X, or may be staggered or spaced in the first direction X; the two second portions 1432 may be symmetrically arranged in the third direction Y or asymmetrically arranged.

As shown in fig. 8, the first portion 1431 further includes a third edge 14313, the third edge 14313 is located on a side of the second edge 14312 away from the edge, and the third edge 14313 extends in the third direction Y. Along the first direction X, one end of the second portion 1432 is located between the first edge 14311 and the third edge 14313, and the other end may be flush with the third edge 14313, may be located between the first edge 14311 and the third edge 14313, or may be located on a side of the third edge 14313 away from the first edge 14311.

One second portion 1432 corresponds to one tab 132 of one electrode assembly 13, so that the tab connection portion 143 can be sufficiently connected to both tabs 132 of two electrode assemblies 13, thereby improving the current capacity of the current collecting member 14.

Fig. 9 and 10 are schematic structural views of a tab and a second portion of a battery cell according to some embodiments of the present application before and after bending, respectively; fig. 11 is a schematic structural view illustrating a tab and a second portion of a battery cell of some embodiments of the present application are bent and then coated with an insulating film.

As shown in fig. 9, 10 and 11, in some embodiments of the present application, the battery cell 10 further includes: and an insulating film 15 covering the tab 132 and the second portion 1432 to insulate and isolate the tab 132 from the bottom wall 111.

The surfaces of the tab 132 and the second portion 1432 can be insulated and isolated from other components by coating the surfaces of the tab 132 and the second portion 1432 with an insulating film 15 before the tab 132 and the second portion 1432 are bent, and after the tab 132 and the second portion 1432 are bent, the tab 132 is insulated and isolated from the bottom wall 111, and the second portion 1432 is insulated and isolated from the first portion 1431. In other embodiments, the insulating film 15 may be attached only to the side of the tab 132 away from the second portion 1432 to insulate and separate the tab 132 from the bottom wall 111.

The tab 132 and the second portion 1432 are connected into a whole, the tab 132 and the second portion 1432 are covered by the insulating film 15, and the bent tab 132 is insulated and isolated from the bottom wall 111 by the insulating film 15, so that the tab 132 can be prevented from being conductively connected with the bottom wall 111 of the shell 11, and the safety performance of the battery cell 10 is improved.

As shown in fig. 3 and 11, in some embodiments of the present application, the battery cell 10 further includes: and a first insulating member 16 disposed between the bottom wall 111 and the electrode assembly 13 for insulating and separating the bottom wall 111 and the electrode assembly 13.

The first insulating member 16 is in a long bar shape, the length direction of the first insulating member 16 extends along the first direction X, the thickness direction extends along the second direction Z, the width direction extends along the third direction Y, the first insulating member 16 is padded on the bottom wall 111 of the housing 11, and the length dimension of the first insulating member 16 is substantially the same as the length dimension of the main body 131. The first insulating member 16 may also be provided in plural, and the plural first insulating members 16 are arranged at intervals along the first direction X and are disposed between the bottom wall 111 and the main body 131 to reduce the weight of the battery cell 10. The first insulating member 16 is made of plastic or silicon.

The use of the first insulator 16 to insulate and separate the bottom wall 111 and the electrode assembly 13 can further prevent the tab 132 from being electrically connected to the bottom wall 111 of the case 11, thereby improving the safety of the battery cell 10.

As shown in fig. 3, in some embodiments of the present application, the end cap assembly 12 further includes a relief portion 123, the relief portion 123 being disposed on the cover 121.

The pressure relief portion 123 is located between the two electrode terminals 122 and penetrates through the cover 121 along the second direction Z, and the pressure relief portion 123, the electrode terminals 122 and the tab 132 are located on the same side of the main body 131.

When the single battery 10 is used upside down, the cover 121 is located on the lower side of the housing 11, the pressure relief portion 123 is located on the lower side of the single battery 10, and when the pressure relief portion 123 is actuated, high-temperature and high-pressure gas is ejected downwards, so that the single battery 10 has good safety performance.

Some embodiments of the present application provide a battery 100. The battery 100 includes a case 20, a battery cell 10, and a thermal management member 30. The battery cell 10 is disposed inside the case 20, the thermal management member 30 is disposed inside the case 20 and at the bottom of the battery cell 10, and the thermal management member 30 is configured to support the cover 121 of the battery cell 10.

The use of the heat management member 30 to support the cover 121 of the battery cell 10 enables the battery cell 10 to be used upside down. Due to the characteristics of the battery cell 10 according to some embodiments of the present invention, the battery 100 according to some embodiments of the present invention has superior safety when used upside down.

Some embodiments of the present application provide an electric device including a battery 100.

Due to the above characteristics of the battery 100 according to some embodiments of the present disclosure, the power consumption device according to the embodiments of the present disclosure also has a better safety performance.

As shown in fig. 1 to 11, an embodiment of the present application provides a battery cell 10 and a battery 100. The battery cell 10 includes a case 11, a cap body 121, an electrode terminal 122, a pressure relief portion 123, an electrode assembly 13, a current collecting member 14, an insulating film 15, a first insulating member 16, and a lower plastic 17, the electrode terminal 122 and the pressure relief portion 123 are disposed on the cap body 121, and the electrode assembly 13 includes a body 131 and tabs 132. The battery cell 10 is assembled upright and used upside down. In the assembled state, the cover 121 of the battery cell 10 is located on the upper side, the tab 132 is located on the lower side, and one of the two current collecting members 14 is a copper connecting plate and the other is an aluminum connecting plate. The two current collecting members 14 are respectively led out from the electrode terminals 122 of the two polarities of the lid 121, extend from the left and right sides to the bottom, and then are bent inward to form a first portion 1431, two rectangular second portions 1432 are formed by extending the edge of the first portion 1431, the second portions 1432 are welded to the tabs 132 by ultrasonic welding, and are bent inward to be flat after being attached with the insulating film 15. First insulator 16 is the base sheet, wraps the main part 131 with mylar membrane circumference, and the both ends of mylar membrane are connected with lower plastic 17 and base sheet hot melt respectively, and mylar membrane corner pastes protection blue glue, avoids the mylar membrane corner of main part 131 and casing 11 short circuit. The above-described assembly is assembled with the case 11 to form the battery cell 10. A plurality of battery cells 10 are placed upside down in the case 20, and a water cooling plate is disposed at the bottom of the battery cells 10 and used to support a cover plate of the battery cells 10, thereby forming the battery 100. The battery 100 is inversely installed on the vehicle 1000, because the pressure relief portion 123 faces the downward opening 113, and the tab 132 is located on the upper side, in the using process, the tab 132 is not pressed, downward air injection can be ensured when the pressure relief portion 123 is actuated, high-temperature and high-pressure air cannot enter the passenger compartment, and the safety performance is high.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing having an opening;

the electrode assembly is arranged in the shell and comprises a main body and two lugs with opposite polarities, and the two lugs are arranged on one side of the main body away from the opening;

the end cover assembly comprises a cover body and two electrode terminals with opposite polarities, the two electrode terminals are arranged on the cover body, and the cover body is used for covering the opening;

two current collecting members, each of which is configured to connect the tab of the same polarity with the electrode terminal.

2. The battery cell as recited in claim 1, wherein the housing includes a bottom wall and a side wall, the cover is coupled to the side wall, the bottom wall is disposed opposite the opening, the current collecting member includes a terminal coupling portion, a transition portion, and a tab coupling portion, the terminal coupling portion is disposed between the cover and the main body and coupled to the electrode terminal, the tab coupling portion is disposed between the bottom wall and the main body and coupled to the tab, and the transition portion is disposed between the side wall and the main body and coupled to the terminal coupling portion and the tab coupling portion.

3. The battery cell as recited in claim 2, wherein the terminal connection part and the tab connection part extend from both ends of the transition part to the same side, respectively.

4. The battery cell as recited in claim 2 wherein the cover is rectangular and the transition portion is disposed between the body and the sidewall along a length of the cover.

5. The battery cell as recited in claim 2, wherein the tab connection part includes a first portion including a first edge and a second edge, the first edge being connected to the transition part, the second edge being connected to the second portion, the transition part and the second portion being located on both sides of the first portion in a thickness direction of the first portion, respectively.

6. The battery cell as recited in claim 5 wherein the first edge and the second edge are perpendicular to each other.

7. The battery cell as recited in claim 5, wherein the second portion and the tab are bent along the second edge toward the first portion, the second portion being between the tab and the body.

8. The battery cell according to claim 5, wherein the battery cell comprises two of the electrode assemblies, the two electrode assemblies being stacked;

the tab connecting part includes two second portions disposed at opposite sides of the first portion, respectively, and the two second portions are connected with two tabs of the same polarity of the electrode assembly, respectively.

9. The battery cell of claim 5, further comprising:

and the insulating film is coated on the lug and the second part so as to insulate and separate the lug and the bottom wall.

10. The battery cell of claim 3, further comprising:

and a first insulating member disposed between the bottom wall and the electrode assembly for insulating and isolating the bottom wall and the electrode assembly.

11. The battery cell of any of claims 1-10, wherein the end cap assembly further comprises a pressure relief portion disposed on the cover.

12. A battery, comprising:

a box body;

the battery cell of any of claims 1-11, the battery cell disposed inside the case;

the thermal management component is arranged in the box body and positioned at the bottom of the battery cell, and the thermal management component is configured to support the cover body of the battery cell.

13. An electric device comprising the battery of claim 12.