CN217719881U

CN217719881U - Battery and electric device

Info

Publication number: CN217719881U
Application number: CN202221833013.3U
Authority: CN
Inventors: 杨路; 沈聃; 李耀
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-11-01
Anticipated expiration: 2032-07-18

Abstract

The present application relates to a battery and a power consuming device; the battery comprises a box body, a confluence part and a plurality of battery monomers, wherein the box body comprises a conductive material part; the plurality of battery monomers are arranged in the box body; the bus component is used for electrically connecting the plurality of battery monomers, wherein the part of the bus component close to the conductive material part is of an arc-shaped structure; and/or the part of the conductive material part close to the bus component is of an arc-shaped structure; the curved structural style is comparatively mild, can reduce the possibility of electric charge at the surperficial gathering of arc structure, and the difficult easy conductor that forms of ionization of air near the arc structure to can reduce and converge and take place the risk of discharging between part and the conducting material portion, and then can improve the security performance of battery.

Description

Battery and electric device

Technical Field

The present application relates to the field of battery technology, and in particular, to batteries and power devices.

Background

The rechargeable battery has the advantages of small volume, high energy density, high safety, small self-discharge, long service life and the like, and is widely applied to multiple fields of energy storage, communication, electric automobiles, aerospace and the like. The battery comprises a plurality of battery cells connected in series, parallel or series-parallel.

As the application environment thereof becomes complicated, the safety requirement of the battery is gradually increased, and therefore, how to improve the safety performance of the battery is urgent.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and a power consumption device, aiming at improving the safety performance of the battery.

In one aspect, the present application provides a battery including a case, a bus bar member, and a plurality of battery cells, the case including a conductive material portion; the plurality of battery monomers are arranged in the box body; the bus component is used for electrically connecting the plurality of battery monomers, wherein the part of the bus component close to the conductive material part is of an arc-shaped structure; and/or a portion of the conductive material portion adjacent to the bus bar member is an arc-shaped structure.

The battery of this application embodiment is including the box that has conducting material portion and the free part that converges of a plurality of batteries of electricity connection, the part that is close to conducting material portion that will converge the part sets up to the arc structure, and/or the part that is close to the part that converges of conducting material portion sets up to the arc structure, the structural style of arc structure is comparatively gentle, can reduce the possibility of electric charge at the surperficial gathering of arc structure, the difficult easy formation conductor of ionization of air near the arc structure, thereby can reduce and converge and take place the risk of discharging between part and the conducting material portion, and then can improve the security performance of battery.

In some embodiments, the bus member protrudes toward the conductive material portion and forms an arc-shaped structure. The integral structure of the bus part is not easy to form a tip region, the charge distribution on the surface of the bus part is uniform, the air near the bus part is not easy to ionize, the risk of discharging near the bus part is further reduced, and the safety performance of the battery is improved.

In some embodiments, the conductive material portion protrudes toward the bus bar member and forms an arc-shaped structure. The whole of the conductive material part is not easy to form a tip region, the electric charge of the conductive material part is uniformly distributed, and the air near the conductive material part is not easy to be ionized, so that the risk of discharging near the conductive material part is further reduced, and the safety performance of the battery is improved.

In some embodiments, the minimum spacing between the bus member and the conductive material portion satisfies the following equation:

in the formula (I), the compound is shown in the specification,

representing an electrical, tip-at-field strength, wherein the tip is a portion of the bus member proximate the conductive material portion, or a portion of the conductive material portion proximate the bus member;

E₀indicating the ideal air breakdown field strength, E₀Take the value of 3 × 10⁶ V/m；

r represents the radius of curvature of the arc-shaped structure in mm;

d represents the minimum distance between the bus member and the conductive material portion in mm;

U₀represents a preset voltage value of the battery, and the unit is V;

δ represents the relative air density, and δ has a value of 1.

When this application satisfies above-mentioned formula, can reduce the risk of discharging between the part of converging and the conducting material portion through adjusting the minimum interval between the part of converging and the conducting material portion, guarantee the security of battery from this.

In some embodiments, the plurality of battery cells constitute a plurality of battery modules, the plurality of battery modules are arranged side by side along a first direction, and at least two battery cells in each battery module are arranged side by side along a second direction, the first direction intersecting the second direction; the bus member includes a first bus bar including two body parts and a connection part connecting the two body parts, one of the two body parts for electrically connecting one of the adjacent two battery modules, the other of the two body portions is used to electrically connect the other of the two adjacent battery modules, and a portion of the connecting portion, which is close to the conductive material portion, is provided in an arc-shaped structure.

In some embodiments, the connecting portion is a cylindrical structure, and the cylindrical structure includes two end portions disposed opposite to each other in the axial direction thereof, and the two end portions are connected to the body portions corresponding to the two end portions, respectively. The part of the connecting part, which is close to the conductive material part, is set to be of an arc-shaped structure, so that the electric charge on the surface of the connecting part can be uniformly distributed, and the air near the connecting part is not easy to be ionized and charged, thereby reducing the risk of discharging between the connecting part and the box body and improving the overall safety of the battery.

In some embodiments, the connecting portion is a plate-shaped structure, the connecting portion includes two intersecting first surfaces, and an abutment between the two intersecting first surfaces is a cambered surface transition structure.

Adopt cambered surface transition structure to connect adjacent first surface, can show the risk that reduces to take place to discharge between connecting portion and the box.

In some embodiments, the cambered surface transition structure between the two intersecting first surfaces is convex toward the direction of the conductive material portion; can make the whole difficult tip region that forms of connecting portion, cambered surface transition structure's charge distribution is even, and near air of cambered surface transition structure is difficult for being ionized, further reduces near cambered surface transition structure and takes place the risk of discharging, improves the security performance of battery.

In some embodiments, the body portion and the connecting portion are connected by an arcuate structure. The body part and the connecting part are connected through the arc-shaped structure, the structure of the connecting area of the body part and the connecting part is gentle, and the point discharge phenomenon is not easy to occur, so that the safety performance of the battery can be further improved.

In some embodiments, the bus member includes a second bus bar for electrically connecting at least two battery cells in each battery module, and a portion of the second bus bar near the conductive material portion has an arc-shaped structure. The structural style of arc structure is comparatively mild, can reduce the possibility of electric charge at the surperficial gathering of arc structure, and the difficult easy formation conductor of ionization of air near the arc structure to can reduce the risk that takes place to discharge between second piece and the conducting material portion that converges, and then can improve the security performance of battery.

In some embodiments, the second bus bar is a plate-like structure, the second bus bar includes two intersecting second surfaces, and an abutment between the two intersecting second surfaces is a cambered transition structure. The cambered surface transition structure is adopted for connection, so that the risk of discharging between the second confluence piece and the box body can be remarkably reduced.

In some embodiments, the curved transition between the two intersecting second surfaces is convex in the direction of the conductive material portion. The integral structure of the second bus piece is not easy to form a tip region, the charge distribution on the surface of the second bus piece is uniform, the air near the second bus piece is not easy to ionize, the risk of discharging near the second bus piece is further reduced, and the safety performance of the battery is improved.

In some embodiments, the battery may further include a first insulating member disposed at least on a surface of the arc structure, and the bus bar member and the case may be further isolated by the first insulating member, so as to reduce a risk of a tip discharge occurring therebetween.

In some embodiments, the battery cell includes a housing assembly including first and second intersecting side faces, an abutment between the first and second side faces being a cambered transition structure. Through passing through cambered surface transition structure with the crossing first side and the second side of shell subassembly and connecting, the charge distribution of the junction between first side and the second side is even, is difficult to local gathering electric charge to make the difficult ionization of air near the shell subassembly, make the risk that takes place to discharge between shell subassembly and the box reduce.

In some embodiments, the battery cell further includes a second insulator disposed at least in the arcuate transition between the first side and the second side. The second insulating part can reduce the risk of air ionization near the shell component, so that the risk of discharging between the shell component and the box body is reduced, and the safety performance of the battery is improved.

In yet another aspect, the present application provides an electric device, which includes a battery as in the above embodiments, the battery being used for providing electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of a partial structure of a vehicle according to an embodiment of the present application;

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

fig. 3 is a schematic structural view of the battery module shown in fig. 2;

fig. 4 is a schematic diagram of a partial top view of a battery according to an embodiment of the present application;

fig. 5 is a schematic diagram of a partial top view of a battery according to another embodiment of the present application;

fig. 6 is a schematic structural view of a bus member and a case of a battery according to an embodiment of the present application;

fig. 7 is a schematic view of a partial top view of a battery according to yet another embodiment of the present application.

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

Wherein, in the figures, the respective reference numerals:

x, a first direction; y, a second direction;

1. a vehicle; 2. a battery; 3. a controller; 4. a motor;

5. a box body; 501. a first tank portion; 502. a second tank portion; 503. an accommodating space;

51. a conductive material portion;

6. a battery module; 7. a battery cell; 8. a housing assembly; 81. a side surface; 82. a third arc-shaped surface;

9. a bus member; 91. a first bus bar; 911. a body portion; 912. a connecting portion; 9121. an end portion; 9122. a first surface;

92. a second bus bar; 921. a second surface; 922. a second arc-shaped surface.

Detailed Description

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

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

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

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 cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

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

The development of battery technology requires consideration of various design factors, such as energy density, cycle life, discharge capacity, charge/discharge rate, and other performance parameters, as well as battery safety.

During transportation, temperature change, or charge and discharge of the battery, the pressure or temperature of the battery cells included in the battery may exceed a threshold value, thereby possibly causing thermal runaway of the battery cells. When a battery includes a plurality of battery cells, when thermal runaway occurs in one of the plurality of battery cells, the battery cell in which the thermal runaway occurs may be damaged due to an insulating member thereof, so that the battery cell in which the thermal runaway occurs has electrical conductivity, can be electrically conducted with a case and forms an equipotential, and thus a potential difference may be generated between the case and the battery cell in which the thermal runaway does not occur, that is, an electric field may be generated between the case and the battery cell in which the thermal runaway does not occur; under the action of an electric field, more charges are collected at the tip of an internal component in the battery, the electric field intensity is enhanced, air near the battery cell is ionized to discharge the air, the air is punctured, a discharging phenomenon occurs between the battery cell and the box body, and the safety risk of the battery is caused. Herein, the internal member in the battery has conductivity, and may include the battery cell itself, a bus bar part connecting adjacent two battery cells, a partial region of the case, and the like; at the tip of the inner member is meant a region of the inner member having a relatively small radius of curvature, the smaller the radius of curvature, the higher the probability that it will cause an electric discharge by ionizing air near the tip into a conductor.

In view of this, the inventors have improved the structure of a battery including a case having a conductive material portion and a bus member electrically connecting a plurality of battery cells; the part of the bus component close to the conductive material part is arranged into an arc-shaped structure; and/or a portion of the conductive material portion adjacent to the bus bar member is provided in an arc-shaped configuration. The arc structure is gentle, is difficult to gather a large amount of charges on its surface to can reduce point discharge's risk, improve the security performance of battery.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric device using the battery.

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

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

Fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application. As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is an exploded schematic view of a battery provided in some embodiments of the present application. As shown in fig. 2, the battery 2 includes a case 5 and a battery cell (not shown in fig. 2) accommodated in the case 5.

The case 5 is used for accommodating the battery cells, and the case 5 may have various structures. In some embodiments, the box body 5 may include a first box body portion 501 and a second box body portion 502, the first box body portion 501 and the second box body portion 502 cover each other, and the first box body portion 501 and the second box body portion 502 jointly define a receiving space 503 for receiving the battery cells. The second casing portion 502 may be a hollow structure with one open end, the first casing portion 501 is a plate-shaped structure, and the first casing portion 501 covers the open side of the second casing portion 502 to form the casing 5 with the accommodating space 503; the first tank 501 and the second tank 502 may be hollow structures with one side open, and the open side of the first tank 501 may cover the open side of the second tank 502 to form the box 5 with the accommodating space 503. Of course, the first tank portion 501 and the second tank portion 502 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing property after the first casing portion 501 and the second casing portion 502 are connected, a sealing member, such as a sealant or a sealing ring, may be provided between the first casing portion 501 and the second casing portion 502.

Assuming that the first box portion 501 covers the top of the second box portion 502, the first box portion 501 may also be referred to as an upper box cover, and the second box portion 502 may also be referred to as a lower box body.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body 5; of course, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series or in parallel or in series-parallel to form a whole and accommodated in the box 5.

Fig. 3 is a schematic structural view of the battery module shown in fig. 2. As shown in fig. 3, in some embodiments, the battery cell 7 is a plurality of battery cells 7, and the plurality of battery cells 7 are connected in series or in parallel or in series-parallel to form the battery module 6. The plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole through the first bus bar, and are accommodated in the case.

The plurality of battery cells 7 in the battery module 6 may be electrically connected to each other by the second bus bar, so as to realize parallel connection, series connection, or parallel connection of the plurality of battery cells 7 in the battery module 6.

Fig. 4 is a schematic partial top view of a battery according to an embodiment of the present application, and the battery shown in fig. 4 is a schematic diagram of the battery, mainly showing the arrangement between a battery cell and a box body and a bus bar, and the first box body portion of the box body is not included in the diagram.

As shown in fig. 4, in some embodiments, the battery 2 includes a case 5, a bus member 9, and a plurality of battery cells 7; the case 5 includes a conductive material portion 51; a plurality of battery cells 7 are arranged in the box body 5; the bus bar member 9 is used to electrically connect the plurality of battery cells 7; wherein, the part of the bus member 9 close to the conductive material part 51 is an arc-shaped structure; and/or the portion of the conductive material portion 51 near the bus member 9 is of an arc-shaped configuration.

The case 5 is an accommodation body for accommodating the plurality of battery cells 7, and an electrically conductive member, which may constitute the electrically conductive material portion 51, is inevitably used at the time of assembly molding. The case 5 has various molding manners, and in some embodiments, the case 5 may include a plurality of connection beams that are sequentially connected and form a structural body surrounding the plurality of battery cells 7, and the connection beams may include the conductive material portions 51. In other embodiments, the case 5 may be integrally formed, and at least a portion of the inner surface of the case 5 may be the conductive material portion 51.

When there is thermal runaway's battery monomer 7 in battery 2, the part of conducting material portion 51 that is close to the part 9 that converges is the arc structure, namely, the surface that is close to the part 9 that converges of conducting material portion 51 is the arcwall face, is difficult for gathering too much electric charge in arcwall face department, and the air near the arcwall face is difficult for being ionized into the conductor to reduce the risk that the near conducting material portion 51 takes place to discharge, improve battery 2's security performance.

The plurality of battery cells 7 may be connected in series or in parallel or in series-parallel by a bus member 9 such as a second bus member to form an integral body. Of course, a plurality of battery cells 7 may also be connected in series or in parallel or in series-parallel by the bus member 9 such as the second bus member to form a plurality of battery modules, and a plurality of battery modules may be connected in series or in parallel or in series-parallel by the bus member 9 such as the first bus member to form a whole. The first bus bar may be made of copper, but other metals such as aluminum may be used. The second bus bar may be made of aluminum, but other metals such as copper may be used. The first confluence piece can be of a plate-shaped structure, can also be of a columnar structure, and can also be of other structural forms; the second bus bar may have a plate-like structure or a columnar structure, but may have other structures.

When there is thermal runaway's battery cell 7 in battery 2, the part that is close to conducting material portion 51 of the part 9 that converges is the arc structure, namely, the part that is close to conducting material portion 51 of the part 9 that converges is the arc structure, is difficult for gathering too much electric charge in arc structure department, and the air near the arc structure is difficult for being ionized into the conductor to reduce near the arc structure risk that takes place to discharge, improve battery 2's security performance.

The battery 2 of the embodiment of the application comprises a box body 5 with a conductive material part 51 and a bus part 9 electrically connected with a plurality of battery monomers 7, the part, close to the conductive material part 51, of the bus part 9 is set to be of an arc-shaped structure, and/or the part, close to the bus part 9, of the conductive material part 51 is set to be of an arc-shaped structure, the structural form of the arc-shaped structure is gentle, the possibility that electric charges are gathered on the surface of the arc-shaped structure can be reduced, air near the arc-shaped structure is not easy to be ionized to form a conductor, the risk of discharging between the bus part 9 and the conductive material part 51 can be reduced, and the safety performance of the battery 2 can be improved.

Continuing to refer to fig. 4, in some embodiments, the bus bar member 9 protrudes toward the conductive material portion 51 and forms an arc structure. The bus member 9 protrudes towards the conductive material part 51 to form an arc structure, the overall structure of the bus member 9 is not easy to form a tip region, the charge distribution on the surface of the bus member 9 is uniform, the air near the bus member 9 is not easy to be ionized, the risk of discharging near the bus member 9 is further reduced, and the safety performance of the battery 2 is improved.

Fig. 5 is a schematic diagram of a partial top view of a battery according to another embodiment of the present application.

As shown in fig. 5, in some embodiments, the conductive material portion 51 protrudes toward the bus member 9 and forms an arc-shaped structure. The conductive material part 51 protrudes towards the bus bar part 9, and protrudes to form an arc-shaped structure, the whole conductive material part 51 is not easy to form a tip region, the electric charge of the conductive material part 51 is uniformly distributed, air near the conductive material part 51 is not easy to be ionized, the risk of discharging near the conductive material part 51 is further reduced, and the safety performance of the battery 2 is improved.

Fig. 6 is a schematic structural view of a bus member and a case of a battery according to an embodiment of the present application.

As shown in fig. 6, in some embodiments, the minimum distance between the bus member and the conductive material portion satisfies the following formula:

in the formula (I), the compound is shown in the specification,

indicating the field strength at the charged tip;

E₀indicating the ideal air breakdown field strength, E₀Value of 3X 10⁶ V/m；

r represents the radius of curvature of the arc-shaped structure in mm;

d represents the minimum distance between the bus member 9 and the conductive material portion 51 in mm;

U₀represents a preset voltage value of the battery, and the unit is V;

δ represents the relative air density, and δ has a value of 1.

In the present formula, the tip may refer to a portion of the bus member 9 near the conductive material portion 51, or a portion of the conductive material portion 51 near the bus member 9, which may cause a tip discharge phenomenon, so that the distance between the bus member 9 and the conductive material portion 51 is adjusted by performing calculation using the field intensity here.

When the present application satisfies the above formula, the risk of discharge between the bus member 9 and the conductive material portion 51 can be reduced by adjusting the minimum distance between the bus member 9 and the conductive material portion 51, thereby ensuring the safety of the battery.

Alternatively,

the upper limit value of the formula can be 100, 500, 1000, 2000 or 5000, etc., the upper limit value of the formula can be regulated according to the required preset voltage value, and the smaller the preset voltage value is, the larger the upper limit value of the formula is.

Fig. 7 is a schematic diagram of a partial top view of a battery according to yet another embodiment of the present application.

As shown in fig. 7, in some embodiments, the plurality of battery cells 7 constitute a plurality of battery modules 6, the plurality of battery modules 6 are arranged side by side in a first direction X, and at least two battery cells 7 in each battery module 6 are arranged side by side in a second direction Y, the first direction X intersecting the second direction Y; the bus bar member 9 includes a first bus bar 91, the first bus bar 91 includes two body portions 911, and a connection portion 912 connecting the two body portions 911, one of the two body portions 911 is used to electrically connect one of the adjacent two battery modules 6, the other of the two body portions 911 is used to electrically connect the other of the adjacent two battery modules 6, and a portion of the connection portion 912 near the conductive material portion 51 is provided in an arc-shaped structure.

In the present application, the first direction X intersects the second direction Y, i.e. the first direction X and the second direction Y may be at an acute angle or perpendicular.

The plurality of battery modules 6 may be connected in series, in parallel, or in series-parallel, and the plurality of battery modules 6 may be electrically connected by the first bus bar 91; illustratively, one end of the first bus bar 91 is connected to the positive electrode terminal of one of the battery modules 6, the other end of the first bus bar 91 is connected to the negative electrode terminal of the other battery module 6, and the two battery modules 6 can be connected in series; alternatively, one end of the first bus bar 91 is connected to the positive electrode terminal of one of the battery modules 6, and the other end of the first bus bar 91 is connected to the positive electrode terminal of the other battery 2, so that the two battery modules 6 can be connected in parallel.

Since the connection portion 912 of the first bus bar 91 is interposed between the two battery modules 6 and has a high risk of discharge near the case 5, the portion of the connection portion 912 near the conductive material portion 51 is formed in an arc-shaped structure, so that the electric charge on the surface of the connection portion 912 can be uniformly distributed, and the air near the connection portion 912 is not easily ionized and charged, thereby reducing the risk of discharge between the connection portion 912 and the case 5 and improving the safety of the entire battery 2.

As shown in fig. 7, as some examples, the connecting portion 912 may be a cylindrical structure, and the cylindrical structure includes two end portions 9121 disposed opposite to each other along the axial direction, and the two end portions 9121 are respectively connected to the body portions 911 corresponding to the two end portions 9121. The connection part 912 has a cylindrical structure, and the electric charge on the surface of the connection part 912 is more uniformly distributed, so that the risk of discharge between the connection part 912 and the case 5 is further reduced, and the safety of the entire battery 2 is further improved. The axial direction of the cylindrical structure in the figure is parallel to the first direction X.

As another example, referring to fig. 7, the connecting portion 912 may have a plate-shaped structure, the connecting portion 912 may include two intersecting first surfaces 9122, and an abutment between the two intersecting first surfaces 9122 may have an arc-shaped transition structure, and a surface of the arc-shaped transition structure may be an arc-shaped surface, and the arc-shaped surface is used as the first arc-shaped surface. That is, the junction between the two intersecting first surfaces 9122 of the plate-like structure may transition through the first arcuate surface. The connecting portion 912 may include a plurality of sets of two intersecting first surfaces 9122, and particularly, a connection portion between the two intersecting first surfaces 9122 of the plate-like structure close to the conductive material portion 51 is formed by a first arc-shaped surface transition connection, so that the risk of electric discharge between the connecting portion 912 and the tank 5 can be significantly reduced. In other words, the junction between the two intersecting first surfaces 9122 of the plate-like structure constitutes an edge of the plate-like structure, and the edge of the plate-like structure may be provided as a cambered transition structure, so that the risk of tip discharge generated by the edge of the plate-like structure can be reduced. Illustratively, the connecting portion 912 may be embodied as a rectangular parallelepiped structure, an outer surface of the rectangular parallelepiped structure includes six first surfaces 9122, that is, the six first surfaces 9122 enclose the entire outer surface of the rectangular parallelepiped structure, and two of the six first surfaces 9122 may be defined as a first surface and a second surface, and the first surface and the second surface intersect. Of course, the connecting portion 912 may have another structure, such as a cubic structure, and is not limited herein.

Specifically, the connection portion 912 may include a first surface, a second surface, and a first arc-shaped surface, the first surface being disposed facing the conductive material portion 51 and extending along the first direction X; the second surface is vertical to the first surface and extends along the first direction X; the first arc-shaped surface is connected with the first surface and the second surface. The second face may refer to any one of two first surfaces 9122 of the connecting portion 912 opposing each other in a third direction perpendicular to the first direction X and the second direction Y two by two.

Connect through first arcwall face between first face and the second face, the structure of the junction of the two is comparatively gentle, and the charge distribution on its surface is comparatively even, is difficult to make near its air take place the ionization and lead to the air electrically conductive to can improve the security performance between connecting portion 912 and the box 5.

Further, the cambered surface transition structure between two crossing first surfaces 9122 protrudes towards the direction of the conductive material portion 51, so that the whole connecting portion 912 is not prone to forming a pointed end region, the charge distribution of the cambered surface transition structure is uniform, air near the cambered surface transition structure is not prone to being ionized, the risk of discharging near the cambered surface transition structure is further reduced, and the safety performance of the battery 2 is improved.

With reference to fig. 7, further, the connection positions of the components inside the first bus bar 91 may be connected by an arc structure, and the structure of the connection positions of the components is relatively smooth, so that the overall structure of the first bus bar 91 is relatively smooth, and the point discharge phenomenon is not easily generated in a local area of the first bus bar 91, thereby improving the overall safety of the battery 2. Specifically, the first bus bar 91 includes two body portions 911 and a connection portion 912 connecting the two body portions 911, the body portions 911 and the connection portion 912 are connected by an arc structure, and a connection area of the body portions 911 and the connection portion 912 has a gentle structure, so that a tip discharge phenomenon is not likely to occur, and thus the safety performance of the battery 2 can be further improved.

With reference to fig. 7, in some embodiments, the bus bar 9 further includes a second bus bar 92, the second bus bar 92 is used to electrically connect at least two battery cells 7 in each battery module 6, and a portion of the second bus bar 92 close to the conductive material portion 51 is an arc-shaped structure. The structural style of the arc-shaped structure is gentle, the possibility of electric charge gathering on the surface of the arc-shaped structure can be reduced, and the air near the arc-shaped structure is not easy to be ionized to form a conductor, so that the risk of discharging between the second bus piece 92 and the conductive material part 51 can be reduced, and the safety performance of the battery 2 can be improved.

Further, the second bus bar 92 may have a plate-shaped structure, the second bus bar 92 includes two intersecting second surfaces 921, and an abutment between the two intersecting second surfaces 921 is a curved surface transition structure, and a surface of the curved surface transition structure may be an arc-shaped surface, and the arc-shaped surface is taken as a second arc-shaped surface 922. I.e. the junction between two intersecting second surfaces 921 of the plate-like structure may be transitionally connected by the second arc-shaped face 922. The second bus bar 92 may include a plurality of sets of two intersecting second surfaces 921, and particularly, a junction between the two intersecting second surfaces 921 of the second bus bar 92 close to the conductive material portion 51 is connected by a transition of the second arc-shaped surface 922, so that the risk of electric discharge between the second bus bar 92 and the box 5 can be significantly reduced. In other words, the joint between the two intersecting second surfaces 921 of the second bus bar 92 constitutes the edge of the second bus bar 92, and the edge of the second bus bar 92 may be provided in an arc-shaped structure, so that the risk of the edge of the second bus bar 92 generating a tip discharge can be reduced. By way of example, the second bus bar 92 may be embodied as a rectangular parallelepiped structure, the outer surface of which comprises six second surfaces 921, i.e. the six second surfaces 921 enclose the entire outer surface of the rectangular parallelepiped structure; for example, two of the six second surfaces 921 may be defined as a third face and a fourth face, which intersect. Of course, the second bus bar 92 may have other structures, such as a cubic structure, and the like, and is not limited herein.

Specifically, the second bus bar 92 may include a third face, a fourth face, and a second arcuate face 922; the third surface is disposed facing the conductive material portion 51 and extends in the first direction X; the fourth surface is vertical to the third surface; the second arcuate face 922 connects the third face and the fourth face. The fourth surface may be any one of two second surfaces 921 of the second bus bar 92 opposing each other in the first direction X; the fourth surface may also be any one of two second surfaces 921 of the second bus bar 92 that are opposite to each other in the third direction.

Further, the arc-shaped transition structure between the two intersected second surfaces 921 protrudes toward the direction of the conductive material part 51, the integral structure of the second bus piece 92 is not prone to forming a pointed region, the electric charge on the surface of the second bus piece 92 is uniformly distributed, air near the second bus piece 92 is not prone to being ionized, the risk of discharging near the second bus piece 92 is further reduced, and the safety performance of the battery 2 is improved.

In some embodiments, the battery 2 may further include a first insulating member disposed at least on a surface of the arc-shaped structure, and the bus bar member 9 and the case 5 may be further isolated by the first insulating member, so as to reduce a risk of a tip discharge occurring therebetween. In addition to providing the first insulating member on the surface of the arc-shaped structure, the first insulating member may also be provided on the surface of the non-arc-shaped structure of the bus bar member 9, so that the protective effect on the bus bar member 9 can be further improved. In the present embodiment, the arc-shaped structure may be a portion of the bus member 9 near the conductive material portion 51, specifically, the arc-shaped structure may be an edge of the connecting portion 912 of the first bus bar 91, a connection point of the connecting portion 912 and the body portion 911, or the like; the edges of the second bus bar 92, etc.; of course, the arc-shaped structure may be a portion of the conductive material portion 51 near the bus bar member 9.

The first insulating member may use Polyvinyl Chloride (PVC), polyethylene terephthalate (PET), or the like.

The surface of the portion of the bus bar member 9 near the conductive material portion 51 may be provided with a first insulating member that can reduce the risk of ionized air near the bus bar member 9, thereby reducing the risk of discharge occurring between the bus bar member 9 and the case 5 and improving the safety performance of the battery 2. The surface of the part of the conductive material part 51 close to the bus bar part 9 may also be provided with a first insulating member, which can reduce the risk of air ionization near the conductive material part 51, thereby reducing the risk of discharge between the bus bar part 9 and the case 5 and improving the safety performance of the battery 2.

In some embodiments, the battery cell 7 includes a housing assembly 8, the housing assembly 8 may include a side 81, the side 81 may include intersecting first and second sides, and the side 81 may include multiple sets of intersecting first and second sides. The junction between the first and second intersecting sides may be a curved transition structure, where the surface acting as the curved transition structure may be an arc-shaped surface, which is used as the third arc-shaped surface 82. That is, the intersecting first and second sides are connected by a third arcuate surface 82. Through passing through the first side and the second side of crossing of shell subassembly 8 through third arcwall face 82 transitional coupling, the charge distribution of the junction between the first side of crossing and the second side is even, is difficult to local gathering electric charge to make the air near shell subassembly 8 be difficult for being ionized, make the risk that takes place to discharge between shell subassembly 8 and the box 5 reduce.

Further, the battery cell 7 may further include a second insulating member, the second insulating member is at least disposed on the arc-shaped transition structure between the first side surface and the second side surface, that is, the second insulating member is at least disposed on the third arc-shaped surface 82, and the second insulating member can reduce the risk of ionized air near the housing assembly 8, so that the risk of discharging between the housing assembly 8 and the box 5 is reduced, and the safety performance of the battery 2 is improved. Of course, the second insulating member may also cover the entire side surface 81, in other words, the second insulating member may cover the entire outer surface of the housing assembly 8, so that the entire housing assembly 8 can be protected, the risk of discharging of the housing assembly 8 is reduced, and the safety performance of the battery 2 is further improved.

The second insulating member may be Polyvinyl Chloride (PVC), polyethylene terephthalate (PET), or the like.

The housing assembly 8 may also be used to contain an electrolyte, such as an electrolyte.

In some embodiments, the housing assembly 8 may include a housing having a hollow structure with an opening, and an end cap assembly covering the opening of the housing and forming a sealed connection to form a receiving chamber for receiving an electrolyte of the electrode assembly. The housing may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case may be determined according to the specific shape of the electrode assembly. For example, if the electrode assembly is of a cylindrical structure, it may be optionally a cylindrical case; if the electrode assembly has a rectangular parallelepiped structure, a rectangular parallelepiped case can be used. In the present application, the side 81 of the housing assembly 8 may be an outer peripheral surface of a casing, for example, the casing may be a rectangular parallelepiped casing with two open ends, the casing may include four surfaces, the four surfaces enclose to form a containing cavity, and each of the four surfaces may be considered as the side 81 of the housing assembly 8.

Referring to fig. 7, as an embodiment of the present application, the battery 2 may include a case 5, a bus member 9, and a plurality of battery cells 7, wherein the case 5 includes a conductive material portion 51, the plurality of battery cells 7 are disposed in the case 5, and the bus member 9 includes a first bus member 91; the plurality of battery cells 7 form a plurality of battery modules 6, the plurality of battery modules 6 are arranged side by side along a first direction X, and at least two battery cells 7 in each battery module 6 are arranged side by side along a second direction Y, the first direction X is perpendicular to the second direction Y; the first bus bar 91 includes two body portions 911 and a connecting portion 912 connecting the two body portions 911, one of the two body portions 911 is used to electrically connect one of the adjacent two battery modules 6, the other of the two body portions 911 is used to electrically connect the other of the adjacent two battery modules 6, and a portion of the connecting portion 912 close to the conductive material portion 51 is provided in an arc-shaped structure. The portion of the conductive material portion 51 near the bus bar member 9 has an arc-shaped configuration.

The battery 2 of the embodiment of the application comprises a box body 5 with a conductive material part 51 and a first bus bar 91 electrically connected with a plurality of battery modules 6, wherein the part, close to the conductive material part 51, of a connecting part 912 of the first bus bar 91 is arranged to be of an arc-shaped structure, the part, close to the first bus bar 91, of the conductive material part 51 is of the arc-shaped structure, the structural form of the arc-shaped structure is gentle, the possibility that electric charges are gathered on the surface of the arc-shaped structure can be reduced, air near the arc-shaped structure is not easy to be ionized to form a conductor, the risk of discharging between the first bus bar 91 and the conductive material part 51 can be reduced, and further the safety performance of the battery 2 can be improved.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims

1. A battery, comprising:

a case including a conductive material portion;

the battery units are arranged in the box body; and

a bus member for electrically connecting the plurality of battery cells,

wherein a portion of the bus member near the conductive material portion is an arc-shaped structure; and/or

The part of the conductive material part close to the bus bar part is of an arc-shaped structure.

2. The battery according to claim 1, wherein the bus member protrudes toward the conductive material portion and forms the arc-shaped structure; and/or

The conductive material portion protrudes toward a direction of the bus member and forms the arc-shaped structure.

3. The battery according to claim 1, wherein the minimum distance between the bus member and the conductive material portion satisfies the following formula:

in the formula (I), the compound is shown in the specification,

representing an electrified tip field strength, wherein the tip is a portion of the bus member proximate to the conductive material portion or a portion of the conductive material portion proximate to the bus member;

r represents the radius of curvature of the arc-shaped structure in mm;

d represents a minimum distance between the bus member and the conductive material portion in mm;

U₀represents a preset voltage value of the battery, and the unit is V;

δ represents the relative air density, and δ has a value of 1.

4. The battery according to claim 1, wherein a plurality of the battery cells constitute a plurality of battery modules, the plurality of battery modules are arranged side by side in a first direction, and at least two of the battery cells in each of the battery modules are arranged side by side in a second direction, the first direction intersecting the second direction;

the bus member includes a first bus member including two body portions and a connecting portion connecting the two body portions, one of the two body portions for electrically connecting one of the battery modules of the adjacent two battery modules, the other of the two body portions for electrically connecting the other of the battery modules of the adjacent two battery modules, a portion of the connecting portion near the conductive material portion being provided in an arc-shaped configuration.

5. The battery according to claim 4,

the connecting part is of a cylindrical structure, the cylindrical structure comprises two end parts which are oppositely arranged along the axial direction of the connecting part, and the two end parts are respectively connected with the body parts corresponding to the two end parts.

6. The battery according to claim 4, wherein the connecting part is a plate-shaped structure, the connecting part comprises two intersecting first surfaces, and the abutment between the two intersecting first surfaces is a cambered surface transition structure.

7. The battery according to claim 6,

the cambered surface transition structure between the two intersecting first surfaces is convex towards the direction of the conductive material portion.

8. The battery of claim 4, wherein the body portion and the connecting portion are connected by an arc-shaped structure.

9. The battery according to claim 4, wherein the bus member includes a second bus bar member for electrically connecting at least two of the battery cells in each of the battery modules, and a portion of the second bus bar member adjacent to the conductive material portion has an arc-shaped structure.

10. The battery according to claim 9,

the second bus piece is of a plate-shaped structure and comprises two intersected second surfaces, and the joint between the two intersected second surfaces is of a cambered surface transition structure.

11. The battery according to claim 10,

the cambered surface transition structure between the two intersected second surfaces is convex towards the direction of the conductive material part.

12. The battery of any one of claims 1-11, further comprising a first insulator disposed at least on a surface of the arcuate structure.

13. The battery according to any one of claims 1 to 11,

the battery cell comprises a shell component, the shell component comprises a first side face and a second side face which are intersected, and the abutting position between the first side face and the second side face is of an arc-surface transition structure.

14. The battery of claim 13, wherein the battery cell further comprises a second insulator disposed at least in the arcuate transition between the first side and the second side.

15. An electrical device comprising a battery as claimed in any one of claims 1 to 14 for providing electrical energy.