WO2021159965A1 - Battery, battery module, battery pack, and electric vehicle - Google Patents

Abstract

A battery (100). The battery (100) comprises a housing (11) and a plurality of electrode core groups (12) that are packaged in the housing (11) and are sequentially arranged, wherein the electrode core groups (12) are connected in series and each of the electrode core groups (12) comprises at least one electrode core; each of the electrode core groups (12) comprises a first electrode leading-out part (121) and a second electrode leading-out part (122) extending out of two opposite ends; the battery (100) further comprises an electrode core group connection piece (13) having an elastic deformation property, wherein the electrode core group connection piece (13) is used for connecting the first electrode leading-out parts (121) and the second electrode leading-out parts (122) of the two electrode core groups (12) that are connected in series.

Description

Battery, battery module, battery pack and electric vehicle

Cross-references to related applications

This application claims the priority of the Chinese patent application number "202010094989.2" filed by "BYD Co., Ltd." on February 13, 2020, entitled "A battery, battery module, battery pack and electric vehicle".

Technical field

This application relates to the field of battery technology, in particular to a battery, a battery module, a battery pack, and an electric vehicle.

Background technique

With the popularization of the concept of electric green travel, more and more families choose electric vehicles as their travel tools, and electric vehicles mainly realize the use of electric energy through the process of battery storage and discharge. Generally, there are multiple battery packs stored in an electric vehicle, and each battery pack includes multiple batteries, and each battery is connected in series or in parallel. The popularity of electric vehicles has made human beings rely on petroleum energy; at the same time, electric energy is also a green energy source, which will not cause damage to the environment and contribute to energy saving and emission reduction. Therefore, more and more people have joined the green travel industry. queue.

However, electric vehicles at this stage mainly carry multiple batteries or battery modules, and each battery is composed of multiple pole cores. The pole cores are connected to the pole cores through electrodes and conduct electricity; In the event of an impact or emergency braking, external factors will cause tensile stress on the battery, and sometimes damage the connection between the pole core and the pole core. What's more, the tensile stress will cause permanent damage to the connection of the pole core. Therefore, how to improve the stability of the connection between the battery poles has become a major problem.

Application content

The purpose of this application is to overcome the deficiencies in the prior art and provide a battery, a battery module, a battery pack and an electric vehicle for improving the stability of the connection between the battery pole cores.

This application further proposes a battery module.

This application further proposes a battery pack.

This application further proposes an electric vehicle.

In order to solve the above technical problems, the present application provides a battery, the battery includes a casing and a plurality of pole core groups arranged in sequence encapsulated in the casing, the pole core sets are connected in series, and the pole core sets include At least one pole core; the pole core set includes a first electrode lead-out part and a second electrode draw-out part protruding from opposite ends; the battery also includes a pole core assembly connector with elastic deformation properties, the pole core The group connector is used to connect the first electrode lead-out part and the second electrode lead-out part of the two electrode core groups connected in series.

According to the battery of the present application, the battery improves the stability of the connection between the electrode core groups.

In some examples of the present application, the battery further includes a plurality of packaging films, and each electrode core group is packaged in a corresponding packaging film.

In some examples of the present application, the first electrode lead-out part and the second electrode lead-out part respectively extend from the two ends of the pole core group out of the side surface of the packaging film, and the pole core group connector is used for Connecting the first electrode lead-out part and the second electrode lead-out part of two adjacent electrode core groups.

In some examples of the present application, the first electrode lead-out part of one of the two adjacent electrode core groups extends opposite to the second electrode lead-out part of the other electrode core group, and The first electrode lead-out part and the second electrode lead-out part extending oppositely have different heights on the side surface of the corresponding packaging film.

In some examples of the present application, one end of the pole core set connecting piece is connected to the first electrode lead-out part of one pole core set, and the other end is connected to the second electrode of the adjacent pole core set. Lead out parts.

In some examples of the present application, the projection of the first electrode lead-out part in the direction toward the second electrode lead-out part is at least partially located on the second electrode lead-out part.

In some examples of the present application, the pole core set connecting member includes two fixing parts located at both ends and a connecting part connected between the two fixing parts, and the two fixing parts are used to respectively connect adjacent poles. The electrode lead-out parts of the core group extending in opposite directions, and the connecting portion is used to buffer the tensile stress between the electrode core groups along the first direction.

In some examples of the present application, the pole core set connecting piece is sheet-shaped, and there is a predetermined angle between the fixing portion and the connecting portion of the pole core set connecting piece.

In some examples of the present application, the fixing portion of the pole core assembly connector and the connecting portion form an angle of 45-135 degrees.

In some examples of the present application, the pole core assembly connecting piece is a Z-shaped piece, the two fixing portions at both ends are both fixing plates, and the connecting portions are connecting plates inclined with respect to the fixing plates.

In some examples of the present application, the packaging film includes a first packaging component and a second packaging component, the first surface of the first packaging component is recessed inward to form a first packaging groove, and the second packaging component The two surfaces are recessed inward to form a second packaging groove; after the first surface of the first packaging component is attached to the second surface of the second packaging component, the first packaging groove and the second packaging groove The encapsulation cavity is formed directly and communicated with each other, and the encapsulation cavity is used for storing the pole core group.

In some examples of the present application, the packaging film includes a packaging area and a lidding area. The packaging area is recessed inward to form a packaging groove. After the packaging area and the lidding area are folded and attached, the lidding The area covers the encapsulation groove of the encapsulation area to form a encapsulation cavity, and the encapsulation cavity is used for storing the pole core group.

In some examples of the present application, the first electrode lead-out part and the second electrode lead-out part of the pole core group are respectively located on both sides of the packaging film along the first direction, and the first electrode leads The component and the second electrode lead-out component respectively extend out of the packaging cavity from where the packaging film is attached.

In some examples of the present application, the depth of the first packaging groove is a first depth, the depth of the second packaging groove is a second depth, and the ratio of the first depth to the second depth is not 1. .

In some examples of the present application, the ratio of the first depth to the second depth is 1.2-8.

In some examples of the present application, the first surface of the first package includes a first edge area surrounding the first package groove, and the second surface of the second package includes a first edge area surrounding the second package groove. The first edge area of the first surface of the first package and the second edge area of the second surface of the second package are sealed and fixed.

In some examples of the present application, the packaging area includes a first edge area surrounding the packaging groove, the cover area includes a second edge area corresponding to the first edge area, and the first edge area of the packaging area The edge area is sealed and fixed to the second edge area of the covering area.

In some examples of this application, the packaging film is an aluminum-plastic composite film or a polymer material composite film.

In some examples of the present application, the material of the pole core assembly connector is copper or aluminum.

In some examples of the present application, the housing includes a housing body having an opening and a cover plate, and the cover plate and the opening of the housing body are hermetically connected to jointly enclose a sealed accommodating chamber. The pole core set is located in the containing chamber, the pole core sets are connected in series to form a pole core assembly string, both ends of the pole core assembly string are respectively provided with a first electrode and a second electrode, the first electrode and the second electrode Lead out from the cover plate respectively.

In some examples of the present application, an air guide hole is provided on the housing, and a seal is provided in the air guide hole.

In some examples of the present application, the packaging film is provided with a sealing ring corresponding to the outlet of the first electrode lead-out part and the second electrode lead-out part, and the sealing ring is tightly arranged on the packaging film. Between the outlet and the first electrode lead-out part or the second electrode lead-out part.

In some examples of the present application, the plurality of pole core groups are arranged in a first direction, the opposite ends of each pole core group are opposite ends in the first direction, and the Both the long side and the long side of the battery extend in the first direction, the battery is a rectangular parallelepiped, the length of the battery is 600mm-2500mm, and the thickness of the battery is greater than 10mm.

In some examples of this application, the thickness of the battery is 13mm-75mm.

According to the battery module of the present application, the battery module includes the above-mentioned battery.

The battery pack according to the present application includes the above-mentioned battery.

The electric vehicle according to the present application includes the above-mentioned battery pack.

The additional aspects and advantages of the present application will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a battery provided by an embodiment of the present application;

Fig. 2 is a side view of the battery in Fig. 1 with the casing removed;

FIG. 3 is a schematic diagram of the structure of adjacent pole core groups in FIG. 2;

Figure 4 is an enlarged view of part IV in Figure 3;

FIG. 5 is a schematic diagram of a three-dimensional structure of a double-sided pit-punched packaging film in an embodiment;

FIG. 6 is a schematic diagram of a three-dimensional structure of a single-sided pit-punched packaging film in an embodiment;

FIG. 7 is a schematic diagram of the closed structure of the packaging film in FIG. 5;

FIG. 8 is a schematic structural diagram of a battery sequence provided by an embodiment of the present application;

Fig. 9 is a schematic structural diagram of a battery pack provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", "vertical", "inner", "outer", etc. indicate the orientation or The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a restriction on this application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of this application, "several" means two or more, unless otherwise clearly defined.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

In the description of the embodiments of the present application, it should be understood that the terms "first" and "second" are only used to facilitate the description of the application and simplify the description, and therefore cannot be understood as limitations on the application.

Please refer to FIGS. 1 and 2 together. FIG. 1 is a schematic diagram of a three-dimensional structure of a battery 100 provided by an embodiment of the present application; FIG. 2 is a side view of the battery 100 in FIG. 1 with the casing 11 removed.

The present application provides a battery 100; the battery 100 includes a casing 11 and a plurality of pole core groups 12 arranged in sequence encapsulated in the casing 11, and the pole core groups 12 are connected in series, and the pole core groups 12 includes at least one pole core; the pole core set 12 includes a first electrode lead part 121 and a second electrode draw part 122 protruding from opposite ends; the battery 100 also includes a pole core assembly connection with elastic deformation properties The pole core set connector 13 is used to connect the first electrode lead-out component 121 and the second electrode lead-out component 122 of the two pole core sets 12 connected in series, that is, one pole core of the two pole core sets 12 connected in series. The first electrode lead-out part 121 of the group 12 and the second electrode lead-out part 122 of the other electrode core group 12 are connected by the electrode core group connector 13 to realize the series connection of the two electrode core groups 12.

The arrangement of the pole core group is not limited in this application, for example, it may be arranged in a multi-row structure or in a single-row structure.

The present application provides a battery 100. The battery 100 includes a casing 11 and a pole core assembly 12 encapsulated in the shell 11. The pole core sets 12 are connected in series by a pole core assembly connector 13, and the poles The core set connector 13 connects the electrode lead-out parts of the pole core set 12 to realize the connection between the pole core sets 12, avoid hard contact between the pole core sets 12, and prevent the pole core set 12 from being damaged. In addition, preferably, the outer periphery of the pole core assembly 12 is covered with an encapsulation film 14, which isolates the casing 11 and the pole core assembly 12, thereby improving the safety performance of the battery 100, and the encapsulation film 14 The pole core assembly 12 achieves secondary sealing, which further improves the safety performance of the battery. The packaging film 14 also further realizes the isolation between the pole core set 12 and the pole core set 12 to improve the stability of the connection of the pole core set 12.

As shown in FIGS. 1 and 2, in this embodiment, the housing 11 is made of metal, and the housing 11 may include, but is not limited to, an aluminum shell or a steel shell. The housing 11 has high strength and good heat dissipation effect. The housing 11 includes a housing body 111 with an opening and a cover 112. In this embodiment, the shell body 111 is in the shape of a long cylinder, and the shell body 111 is provided with openings at both ends along the length direction; the two cover plates 112 are respectively located at the two ends of the shell body 111, The openings are sealed and connected to form a sealed accommodating chamber together, and the pole core set 12 is located in the accommodating chamber.

A plurality of pole core groups 12 are connected in series to form a pole core string. The pole core string has a first electrode and a second electrode at both ends along the length direction. The first electrode of the pole core string may be located at one end of the pole core string. The first electrode lead-out part of the pole core set 12, and the second electrode of the pole core string may be the second electrode lead-out part of the pole core set 12 located at the other end of the pole core string. The first electrode and the second electrode of the pole core string respectively extend from the cover plate 112. The first electrode and the second electrode of the pole core string may be led out from the same cover plate 112, or may be led out from two cover plates 112 respectively, which is not limited.

In this embodiment, the housing 11 is provided with an exhaust hole, a seal is provided in the exhaust hole, and the exhaust hole is used to vacuum the inside of the housing 11. Form negative pressure.

In this embodiment, the thickness of the metal shell 11 is 0.05 mm-1 mm.

In other embodiments, the number of the cover plate 112 may also be one.

In other embodiments, the shell body 111 may only be provided with an opening at one end, and the number of the cover plate 112 is one, so that the cover plate 112 and the shell body 111 are hermetically connected to one end of the opening. In this way, the first electrode and the second electrode of the pole core string are led out from the same cover plate 112.

In this embodiment, the direction in which the plurality of pole core groups 12 are arranged in series is taken as the first direction, that is, the length direction of the battery 100, as shown in the direction A marked in FIG. 2.

Please refer to Fig. 3 and Fig. 4, Fig. 3 is a schematic diagram of the structure of two adjacent pole core groups 12 in Fig. 2; Fig. 4 is an enlarged view of part IV in Fig. 3. Wherein, two adjacent pole core groups 12 shown in FIG. 3 are adjacent pole core groups 12 in the pole core string in FIG. 2, and FIG. 3 is a top view of the adjacent pole core groups 12 in FIG. 2.

As shown in FIGS. 3 and 7, in this embodiment, the battery 100 further includes a plurality of packaging films 14, and each electrode core group 12 is packaged in a corresponding packaging film 14. That is, a packaging film 14 is also provided between the housing 11 and the pole core group 12. The packaging film 14 is wrapped around the outer circumference of the pole core assembly 12; therefore, the pole core assembly 12 can be re-encapsulated through the packaging film 14 and the casing 11, which is beneficial to improve the sealing effect of the battery 100. It can be understood that electrolyte solution is also injected into the packaging film 14. Through the above method, contact of the electrolyte with the casing 11 can also be avoided, and the metal casing 11 can be prevented from being corroded or decomposed by the electrolyte.

Therefore, the packaging film 14 has a certain degree of insulation and corrosion resistance to the electrolyte. The material of the packaging film 14 is not particularly limited here, as long as it can be insulated and does not react with the electrolyte; in some embodiments, The material of the packaging film 14 may include polypropylene (PP), polyethylene (PE) or a multilayer composite film, such as an aluminum-plastic composite film or a polymer material composite film. The packaging film 14 includes a laminated non-metal outer layer. The inner layer film is located between the pole core group 12 and the outer layer film, the melting point of the outer layer film is greater than the melting point of the inner layer film, and the outer layer film and the inner layer The melting point difference of the film ranges from 30°C to 80°C.

The pole core mentioned here is a pole core commonly used in the field of power battery 100. The pole core and pole core group 12 are internal components of the battery 100 shell, and cannot be understood as the battery 100 itself; the pole core may be wound The formed pole core can also be a pole core made of laminated sheets; in general, the pole core includes at least a positive electrode sheet, a separator, a negative electrode sheet, and an electrolyte. The pole core generally refers to a component that is not completely sealed.

In this embodiment, the pole core set 12 may include a single pole core; it may also include at least two pole cores, and at least two pole cores are connected in parallel to form the pole core set 12.

The pole core set 12 includes a body of the pole core set 12 and a first electrode leading component 121 and a second electrode leading component 122 that are electrically connected to the body of the pole core set 12 for drawing current. The first electrode lead-out part 121 and the second electrode lead-out part 122 respectively extend from the two ends of the electrode core assembly 12 out of the side surface of the packaging film 14. The pole core set connecting member 13 is used to connect the first electrode lead-out component 121 and the second electrode lead-out component 122 of two adjacent pole core sets 12.

As shown in FIG. 3, the packaging film 14 is in the shape of a rectangular parallelepiped capsule or the like. The plurality of pole core groups 12 are arranged along a first direction, the opposite ends of each encapsulation film 14 are two end faces along the first direction, and the long sides of the pole core groups 12 are arranged along the first direction; as shown in FIG. 3 7 and the structure of the packaging film 14 shown in FIG. 7, the first electrode extraction member 121 extends from the packaging film 14 from one side end surface of the packaging film 14 in the first direction from the inside of the packaging film 14; the second electrode The lead-out member 122 extends from the other side end surface of the packaging film 14 in the first direction to extend the packaging film 14; and the packaging film 14 corresponds to the first electrode lead-out part 121 and the second electrode lead-out part A sealing ring is provided at the exit of the extension 122, and the sealing ring is tightly arranged between the exit of the packaging film 14 and the first electrode lead-out part 121 or the second electrode lead-out part 122, and only the The first electrode lead-out part 121 and the second electrode lead-out part 122 extend out of the packaging film 14; thus, the sealing property inside the packaging film 14 is ensured.

The sealing ring can be made of rubber, foam and other materials.

The material of the first electrode lead-out component 121 and the second electrode lead-out component 122 is the same as the electrode material, such as copper or aluminum. The electrode lead-out component is sheet-shaped, and the first electrode lead-out component 121 and the second electrode lead-out component 122 are respectively disposed on both sides of the electrode core assembly 12 along the first direction.

In a specific application scenario, the first electrode lead-out component 121 extends perpendicularly from one end surface of the packaging film 14 along the first direction, and the second electrode lead-out component 122 extends perpendicularly from the packaging film 14 along the first direction. The end face on the other side in one direction.

In this embodiment, the direction perpendicular to the first direction from the first electrode extraction member 121 to the second electrode extraction member 122 is taken as the second direction, as shown in the direction B in FIGS. 1 and 3.

Among the plurality of pole core groups 12 arranged in the first direction, the first electrode lead-out part 121 of one pole core set 12 and the second electrode lead-out part 122 of another adjacent pole core set 12 are arranged opposite to each other, and the The first electrode lead-out part 121 of one electrode core group 12 and the second electrode lead-out part 122 of the adjacent other electrode core group 12 have different heights on the end surface of the corresponding encapsulation film 14, and the first electrode lead-out part 121 In the direction toward the second electrode lead-out component 122, that is, the projection in the second direction is at least partially located on the second electrode lead-out component 122.

Therefore, the structure of the present application realizes the connection of the electrode lead-out parts of the adjacent pole core sets 12, reduces the distance between the pole core sets of the two pole core sets in the first direction, and reduces the pole core sets 12 in the first direction. The overall arrangement length of the battery 100 prevents the overall length of the battery 100 from being too long, and at the same time makes the first electrode lead-out part 121 and the second electrode lead-out part 122 not in the same plane, because when the first electrode lead-out part 121 faces the second electrode lead-out In the case of the component 122, the pole core string is subjected to tensile stress in the first direction, which will cause the relative contact between the first electrode lead-out component 121 and the second electrode lead-out component 122; The collision of the one electrode lead-out component 121 and the second electrode lead-out component 122 damages the internal structure of the electrode core assembly 12, causing the battery 100 to fail to work normally.

As shown in FIGS. 3 and 4, in this embodiment, one end of the pole core set connecting member 13 is connected to the first electrode lead-out part 121 of one pole core set 12, and the other end is connected to another adjacent pole core set. 12 of the second electrode lead part 122.

Wherein, the pole core set connecting member 13 includes two fixing portions 131 at both ends and a connecting portion 132 connected between the two fixing portions 131, and the two fixing portions 131 are used to connect adjacent pole core sets 12 The connecting portion 132 is used to buffer the tensile stress between the pole core groups 12 along the first direction.

The pole core assembly connector 13 is made of a material with elastic deformation properties and has good electrical conductivity. Preferably, the material of the pole core assembly connecting member 13 is copper or aluminum. The pole core set connecting piece 13 is in the shape of a sheet; preferably, the pole core set connecting piece 13 is a Z-shaped connecting piece, wherein the fixing portions 131 at both ends of the pole core set connecting piece 13 are in a plate shape, that is, fixed Plate; the connecting portion 132 in the middle of the pole core assembly connecting member 13 is also plate-shaped, and is arranged obliquely with respect to the fixed plate.

There is a preset angle between the fixing portion 131 and the connecting portion 132 of the pole core assembly connector 13. The preset angle is generally 45 to 135 degrees. Preferably, the fixing portions 131 at both ends of the pole core assembly connecting member 13 are arranged parallel to each other, and the angle between the connecting portion 132 and the fixing portions 131 at both ends is 45. Spend.

The fixing portions 131 at both ends of the pole core assembly connector 13 are connected to the first electrode lead-out component 121 or the second electrode lead-out component 122; specifically, as shown in FIG. 4, the two pole core assembly connectors 13 The fixing portion 131 at the end is welded to the first electrode lead-out part 121 or the second electrode lead-out part 122 on one side surface of the connecting part 132 away from the outside. The pole core assembly connector 13 is fixedly connected between the first electrode lead-out part 121 and the second electrode lead-out part 122.

In other embodiments, the fixing portion 131 at both ends of the pole core assembly connector 13 is welded to the first electrode lead-out component 121 or the second electrode lead-out component 122 on one surface facing the connecting portion 132. That is, the fixing portion 131 at one end of the pole core assembly connector 13 faces the side surface of the connecting portion 132, and the side surface of the first electrode lead-out part 121 of the pole core assembly 12 facing away from the second electrode lead-out part 122. Welding, the fixing portion 131 at the other end of the pole core set connecting piece 13 faces one side surface of the connecting portion 132, and the second electrode lead-out part 122 of the other pole core set 12 faces away from the first electrode lead-out part One side surface of 121 is welded; so that the fixing portion 131 of the pole core assembly connector 13 is buckled on the outer side surface of the first electrode lead-out part 121 or the second electrode lead-out part 122, so that the pole core assembly The connection between the connecting member 13 and the first electrode lead-out part 121 or the second electrode lead-out part 122 is more stable.

In other embodiments, the pole core set connecting member 13 may be an I-shaped sheet or an S-shaped sheet, and two ends of the pole core set connecting member 13 are respectively connected to the first electrode lead-out part 121 and the second electrode. The lead-out component 122 allows the pole core set connecting member 13 to relieve the tensile stress of the two adjacent pole core sets 12 in the first direction through elastic deformation.

In other embodiments, the pole core assembly connecting member 13 may also be a spring.

As shown in FIG. 3, in this embodiment, the length of the pole core set connecting piece 13 in the second direction is the effective distance of the pole core set connecting piece 13 because the pole core set connecting piece 13 is The length in the second direction determines the amount of deformation of the pole core assembly connecting member 13 when subjected to tensile stress in the first direction. The length of the pole core assembly connector 13 in the second direction depends on the height difference between the first electrode lead-out part 121 and the second electrode lead-out part 122 on the side surface of the corresponding packaging film 14.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of the three-dimensional structure of the double-sided punched encapsulation film 14 in an embodiment.

In this embodiment, the packaging film 14 is a double-sided punched packaging film 14.

As shown in FIGS. 3 and 5, the packaging film 14 includes a first packaging member 141 and a second packaging member 142. The first packaging member 141 includes a first surface 1411, and the first surface 1411 is recessed inwardly. The first packaging groove 1412 has a depth d1; the second packaging member 142 includes a second surface 1421, and the second surface 1421 is recessed inward to form a second packaging groove 1422. The depth of the second packaging groove 1422 is d2. The opening shape of the first packaging groove 1412 corresponds to the opening shape of the second packaging groove 1422.

The ratio of the depth d1 of the first encapsulation groove 1412 to the depth d2 of the second encapsulation groove 1422 is not one. In a preferred embodiment, the depth d1 of the first encapsulation groove 1412 and the depth d2 of the second encapsulation groove 1422 are different. The ratio of the depth d2 is 1.2-8.

The original material of the packaging film 14 is in the shape of a plate, that is, the first packaging member 141 and the second packaging member 142 are an integral structure. The groove 1412 and the second packaging groove 1422.

When the packaging film 14 is in the unfolded state, the first surface 1411 of the first packaging member 141 and the second surface 1421 of the second packaging member 142 are in the same plane, and the first packaging groove 1412 is in the same plane as the second surface 1421 of the second packaging member 142. The second packaging grooves 1422 are all recessed inwardly away from the plane; when the first packaging member 141 and the second packaging member 142 of the packaging film 14 are folded toward each other, the first surface 1411 of the first packaging member 141 and The second surface 1421 of the second packaging member 142 is attached to each other, and the first packaging groove 1412 and the second packaging groove 1422 are directly connected to form a packaging cavity, and the packaging cavity is used to store the pole core Group 12.

The first surface 1411 of the first packaging member 141 includes a first edge region 14111 surrounding the opening of the first packaging groove 1412; the second surface 1421 of the second packaging member 142 includes the opening surrounding the second packaging groove 1422 The surrounding second edge area 14211, when the first package 141 and the second package 142 are folded and attached, that is, the first surface 1411 of the first package 141 and the second package 142 The second surface 1421 of the first surface 1421 is attached to each other, the openings of the first packaging groove 1412 and the second packaging groove 1422 are directly connected to the stroke packaging cavity, and the first edge area 14111 of the first surface 1411 is connected to the second The second edge area 14211 of the surface 1421 is in contact. By sealing and fixing the first edge area 14111 and the second edge area 14211, the pole core assembly 12 is packaged in the package cavity. In a specific application scenario, the first edge area 14111 of the first surface 1411 and the second edge area 14211 of the second surface 1421 are fixed by adhesive bonding or welding.

The first electrode lead-out part 121 and the second electrode lead-out part 122 of the pole core set 12 are respectively located on both sides of the packaging film 14 along the first direction, and the first electrode lead-out part 121 and the second electrode lead-out part 122 are respectively located The packaging cavity protrudes from where the packaging film 14 is attached.

In other embodiments, the first package 141 and the second package 142 are non-integrated structures, that is, the first package 141 and the second package 142 are component structures, and they are in the first package. The first surface 1411 of the component 141 is punched out of the first packaging groove 1412, and the second surface 1421 of the second packaging component 142 is punched out of the second packaging groove 1422, and then the first surface 1411 of the first packaging component 141 and the The second surface 1421 of the second packaging member 142 is relatively attached, so that the openings of the first packaging groove 1412 on the first packaging member 141 and the second packaging groove 1422 on the second packaging member 142 are directly connected , Forming a packaging cavity; making the first edge area 14111 of the first surface 1411 and the second edge area 14211 of the second surface 1421 contact. By sealing and fixing the first edge region 14111 and the second edge region 14211, the pole core assembly 12 is packaged in the packaging cavity.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of a three-dimensional structure of a single-sided punched encapsulation film 14 in another embodiment.

In this embodiment, the packaging film 14 is a single-sided punched packaging film 14.

As shown in FIG. 6, in this embodiment, the packaging film 14 includes a packaging area 143 and a cover area 144. The packaging area 143 forms an inwardly recessed packaging groove 1432 through a stamping process. The packaging area 143 and the cover After the sealing area 144 is folded and attached in half, the sealing area 144 covers the packaging groove 1432 of the packaging area 143 to form a packaging cavity, and the packaging cavity is used to store the electrode core assembly 12. Wherein, the portion of the packaging film 14 corresponding to the covering area 144 is a flat surface.

Wherein, the packaging area 143 includes a first edge area 14111 surrounding the opening of the packaging groove 1432, and a second edge area 14211 is provided at a position corresponding to the first edge area 14111 of the cover area 144. When the packaging area 143 and the cover area 144 are folded and attached, the first edge area 14111 of the package area 143 is in contact with the second edge area 14211 of the cover area 144, and the first edge area of the package area 143 The 14111 is fixedly connected to the second edge area 14211 of the cover area 144 so as to seal and fix the pole core assembly 12 in the packaging film 14.

Compared with double-sided punching, the single-sided punching pit in this embodiment reduces the punching process and saves punching costs. The material requirements for the packaging film 14 are lower, the generation of punching waste is reduced, and the production cost is reduced. The production speed of the packaging film 14 is increased, the installation process of the pole core assembly 12 is simplified, and the production efficiency is improved.

As shown in FIG. 1 and FIG. 2, in some embodiments, the battery 100 is a rectangular parallelepiped, and the length of the battery 100 is 600 mm-2500 mm. For example, the size of the battery 100 may be 500 mm, 1000 mm, or 1500 mm. By arranging a plurality of pole core groups 12 in the battery 100, compared with the existing method of only providing one pole core, the battery 100 with a longer length can be manufactured more conveniently. In the traditional battery 100, once the battery 100 is longer , The length of the copper-aluminum foil used as the current collector will increase accordingly, which greatly increases the internal resistance of the battery 100 and cannot meet the current higher and higher power and fast charging requirements. In the case that the battery 100 has the same length, this embodiment can greatly reduce the internal resistance of the battery 100, and avoid problems caused by the battery 100 overheating under high power output, fast charging, and the like.

The thickness of the battery 100 is greater than 10 mm, for example, it may be in the range of 13 mm-75 mm.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of the assembly structure of the packaging film 14 in FIG. 3.

When assembling, as shown in FIGS. 2 and 7, the electrode core assembly 12 is first placed in the first packaging groove 1412 of the packaging film 14, and the first electrode lead-out part 121 and the second electrode lead-out part 122 The two end surfaces of the packaging film 14 protrude from the inside of the first packaging groove 1412 in the first direction, and then the first surface 1411 of the first packaging member 141 and the second surface 1421 of the second packaging member 142 are combined. The relative bonding makes the first packaging groove 1412 and the second packaging groove 1422 directly communicate with each other to form a packaging cavity. The pole core assembly 12 is located in the packaging cavity. The first edge area 14111 of the first surface 1411 is fixedly connected to the second edge area 14211 of the second surface 1421. Thus, the pole core assembly 12 is assembled in the packaging film 14 to form a pole core assembly.

As shown in Figures 1 and 2, the length direction of the above-mentioned packaged pole core assembly is arranged along the first direction, so that the first electrode lead-out part of one pole core set 12 of two adjacent pole core sets 12 121 and the second electrode lead-out part 122 of the other electrode core group 12 extend oppositely, the first electrode lead-out part 121 and the second electrode lead-out part 122 that extend oppositely have different heights on the side surface of the corresponding encapsulation film 14, and the first electrode lead-out part 122 The projection of an electrode lead-out part 121 in the direction toward the second electrode lead-out part 122 is at least partially located on the second electrode lead-out part 122; and then one end fixing part 131 of the electrode core assembly connector 13 is welded to The first electrode lead-out part 121 of one pole core set 12, and the other end fixing part 131 is welded to the second electrode lead-out part 122 of the pole core set 12 adjacent in the first direction, so as to realize the multiple pole core assemblies along the first direction. One direction is fixedly connected to form a pole core string.

Finally, the pole core strings are sequentially inserted into the shell body 111, and the cover plate 112 is fixedly connected to the openings at both ends of the shell body 111; thus, the assembly of the battery 100 is completed.

Please refer to FIG. 8, which is a schematic structural diagram of a battery sequence 200 provided by an embodiment of the present application.

As shown in FIG. 8, in some embodiments, the thickness of the battery 100 extends along the second direction, and a plurality of the batteries 100 are arranged in sequence along the second direction to form the battery sequence 200; and at least two There is a gap between adjacent batteries 100, and the ratio of the gap to the thickness of the battery 100 ranges from 0.001 to 0.15.

The number of the battery sequence 200 can be one or more, and there can be one or more batteries 100 in each battery sequence 200. In actual production, the number of batteries 100 can be set according to actual needs. The number of battery sequences 200 can also be set according to actual needs, which is not specifically limited in this application.

It should be noted that the gap between two adjacent batteries 100 will change as the working time of the battery 100 increases, but whether it is in operation or after operation or before the battery 100 leaves the factory, as long as the gap between the batteries 100 is satisfied The ratio of the gap to the thickness is within the scope defined by this application, and all fall within the protection scope of this application.

Please refer to FIG. 9, which is a schematic structural diagram of the battery pack 300 provided by the present application.

As shown in FIG. 9, the present application also provides a battery pack 300 including a battery sequence 200. The battery pack 300 further includes a battery cover and a tray 30, wherein the battery cover is not shown in the view of FIG. 9. The battery cover and the tray 30 are hermetically connected to form a battery 100 accommodating cavity, and the battery sequence 200 is located in the battery 100 accommodating cavity. Wherein, the tray 30 includes a support 31, a support area is formed on the metal shell 11 of the battery 100, and the battery 100 is docked with the support 31 through the support area to be supported on the support 31.

In some embodiments, the tray 30 includes an edge beam, which serves as a support 31, and the battery 100 is supported on the edge beams at both ends of the battery 100 along its length.

The present application also provides an electric vehicle, which includes the above-mentioned battery pack 300. The battery pack 300 adopts the battery 100 provided in the present application, and the vehicle has a high endurance capability and a low cost.

The present application provides a battery 100, a battery module, a battery pack 300, and an electric vehicle. The battery 100 includes a housing 11 and a pole core assembly 12 enclosed in the shell 11. The pole core set connector 13 is connected in series. The pole core set connector 13 connects the electrode lead-out parts of the pole core set 12 to realize the connection between the pole core sets 12, avoid hard contact between the pole core sets 12, and prevent The core group 12 is damaged.

The above is the implementation of the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the embodiments of the present application, several improvements and modifications can be made, and these improvements and modifications are also Treated as the scope of protection of this application.

Claims (27)

1. A battery, characterized in that the battery comprises a casing and a plurality of pole core groups arranged in sequence enclosed in the casing, the pole core groups are connected in series, and the pole core group includes at least one pole core;

   The pole core set includes a first electrode lead-out component and a second electrode lead-out component extending from opposite ends;

   The battery further includes a pole core assembly connector having elastic deformation properties, and the pole core assembly connector is used to connect the first electrode lead-out part and the second electrode lead-out part of the two electrode core assemblies connected in series.
2. The battery according to claim 1, wherein the battery further comprises a plurality of packaging films, and each electrode core group is packaged in a corresponding packaging film.
3. The battery according to claim 2, wherein the first electrode lead-out part and the second electrode lead-out part respectively extend from both ends of the electrode core group out of the side surface of the packaging film, and the electrode The core group connector is used to connect the first electrode lead-out component and the second electrode lead-out component of two adjacent electrode core groups.
4. The battery according to claim 3, wherein the first electrode leading part of one of the two adjacent electrode core groups and the second electrode of the other electrode core group are drawn The parts extend toward each other, and the first electrode lead-out parts and the second electrode lead-out parts that extend oppositely have different heights on the side surfaces of the corresponding packaging film.
5. The battery according to claim 4, wherein one end of the pole core assembly connecting member is connected to the first electrode lead-out part of one pole core assembly, and the other end is connected to the adjacent pole core assembly of the other pole assembly. The second electrode leads out the component.
6. The battery according to claim 4, wherein the projection of the first electrode lead-out part in a direction toward the second electrode lead-out part is at least partially located on the second electrode lead-out part.
7. The battery according to claim 5, wherein the pole core assembly connecting member comprises two fixing parts at two ends and a connecting part connected between the two fixing parts, and the two fixing parts are used for The electrode lead-out parts extending in opposite directions of the adjacent pole core groups are respectively connected, and the connecting portion is used for buffering the tensile stress received between the pole core groups along the first direction.
8. 8. The battery according to claim 7, wherein the pole core assembly connecting member is sheet-shaped, and the fixing portion of the pole core assembly connecting member and the connecting portion have a predetermined angle.
9. 8. The battery according to claim 8, wherein the fixing portion of the pole core assembly connecting member and the connecting portion form an angle of 45 to 135 degrees.
10. The battery according to claim 9, wherein the pole core assembly connecting piece is a Z-shaped piece, the two fixing portions at both ends are both fixing plates, and the connecting portion is opposite to the fixing plate. Inclined connecting plate.
11. The battery according to claim 3, wherein the packaging film comprises a first packaging member and a second packaging member, a first surface of the first packaging member is recessed inward to form a first packaging groove, and the first packaging film The second surface of the two packages is recessed inward to form a second package groove; after the first surface of the first package is attached to the second surface of the second package, the first package groove and the The second encapsulation groove is directly connected to form a encapsulation cavity, and the encapsulation cavity is used for storing the pole core assembly.
12. The battery according to claim 3, wherein the packaging film comprises a packaging area and a cover area, the packaging area is recessed inward to form a packaging groove, and the packaging area and the cover area are folded and bonded in half. , The capping area covers the packaging groove of the packaging area to form a packaging cavity, and the packaging cavity is used for storing the electrode core assembly.
13. The battery according to any one of claims 11 or 12, wherein the first electrode lead-out part and the second electrode lead-out part of the electrode core assembly are respectively located on the side of the packaging film along the first direction. On both sides, the first electrode lead-out part and the second electrode lead-out part respectively extend out of the packaging cavity from where the packaging film is attached.
14. The battery according to claim 11, wherein the depth of the first packaging groove is a first depth, the depth of the second packaging groove is a second depth, and the first depth is the same as the second depth. The ratio of is not 1.
15. The battery according to claim 14, wherein the ratio of the first depth to the second depth is 1.2-8.
16. The battery according to claim 11, wherein the first surface of the first packaging member includes a first edge area surrounding the first packaging groove, and the second surface of the second packaging member includes a first edge region surrounding the first packaging groove. In the second edge area of the second packaging groove, the first edge area of the first surface of the first packaging component and the second edge area of the second surface of the second packaging component are sealed and fixed.
17. The battery according to claim 12, wherein the packaging area comprises a first edge area surrounding the packaging groove, the cover area comprises a second edge area corresponding to the first edge area, and The first edge area of the encapsulation area and the second edge area of the cover area are sealed and fixed.
18. The battery according to claim 2, wherein the packaging film is an aluminum-plastic composite film or a polymer material composite film.
19. The battery according to any one of claims 1-18, wherein the material of the electrode core assembly connector is copper or aluminum.
20. The battery according to any one of claims 1-19, wherein the casing comprises a casing body having an opening and a cover plate, and the cover plate and the opening of the casing body are hermetically connected to jointly enclose A sealed containing chamber, the plurality of pole core groups are located in the containing chamber, the pole core sets are connected in series to form a pole core string, and both ends of the pole core string are respectively provided with a first electrode and a second electrode Electrodes, the first electrode and the second electrode are respectively drawn from the cover plate.
21. The battery according to claim 2, wherein the casing is provided with an air guide hole, and a sealing member is provided in the air guide hole.
22. The battery according to claim 3, wherein the packaging film is provided with a sealing ring corresponding to the outlet of the first electrode lead-out part and the second electrode lead-out part, and the sealing ring is tightly arranged at Between the outlet of the packaging film and the first electrode lead-out component or the second electrode lead-out component.
23. The battery according to claim 3, wherein the plurality of pole core groups are arranged along a first direction, and opposite ends of each pole core group are opposite ends in the first direction, so The long sides of the pole core assembly and the long sides of the battery extend in the first direction, the battery is a rectangular parallelepiped, the length of the battery is 600mm-2500mm, and the thickness of the battery is greater than 10mm.
24. The battery according to claim 22, wherein the thickness of the battery is 13mm-75mm.
25. A battery module, wherein the battery module comprises the battery according to any one of claims 1-23.
26. A battery pack, characterized by comprising a plurality of batteries according to any one of claims 1-24.
27. An electric vehicle, characterized by comprising the battery pack according to claim 26.

Images