WO2019134698A1

WO2019134698A1 - Battery cell, battery module and automobile

Info

Publication number: WO2019134698A1
Application number: PCT/CN2019/070631
Authority: WO
Inventors: 蒋露霞; 程晗; 颜海鹏; 潘仪; 何科峰; 袁万颂
Original assignee: 比亚迪股份有限公司
Priority date: 2018-01-08
Filing date: 2019-01-07
Publication date: 2019-07-11

Abstract

A battery cell (100) comprises a housing (3), a cover plate (4) and an electrode core. The housing (3) has an opening (32) and is provided with a housing expansion cavity (31) protruding outward. The opening (32) is covered by the cover plate (4). The electrode core is disposed in the housing (3) and comprises an electrode core body (1) having a first expansion end (12). The first expansion end (12) is provided with a cooling structure fitting region (121) and a first expansion region (122) protruding with respect to the cooling structure fitting region (121). The first expansion region (122) is at least partially accommodated in the housing expansion cavity (31), and the cooling structure fitting region (121) is recessed with respect to the first expansion region (122) to form a cooling structure installation space.

Description

Battery unit, battery module and car

Cross-reference to related applications

Priority is claimed on Chinese Patent Application No. 201810015504.9, No. 201810016060.0, No. 201810015506.8, 201810016052.6, 201810015502.X, 201810016520.X, 201810015503.4, 201810016056.4, filed on January 8, 2018; this application claims May 17, 2018 Priority of Chinese patent application filed on the Japanese Patent Application No. 201810475762.5.

Technical field

The present application relates to the field of batteries, and relates to a battery unit, a battery module, and an automobile.

Background technique

With the development of technology, various electronic devices, power tools, etc. are widely used, such as mobile phones, electric vehicles, etc. As a core component, the performance of the battery has an important impact on the overall performance and experience; among them, the capacity of the battery determines The overall battery life is also an important concern for users.

The battery includes a casing and a pole core disposed in the casing. The volume of the battery unit determines the volume of the core core to a certain extent, and is an important determinant of the battery capacity. In electronic equipment and power tools, the installation environment of the battery is basically determined. With the size of the space occupied by the battery, the overall volume of the battery is difficult to increase without limitation, and the capacity of the battery is also limited.

Application content

It is an object of the present application to provide a battery unit to increase battery capacity in the presence of space constraints.

In order to achieve the above object, the present application provides a battery unit, wherein the battery unit includes a housing, a cover plate, and a pole core, the housing having an opening, and the housing is provided with an outwardly protruding housing expansion cavity. The opening is closed by the cover plate, the pole core is disposed in the outer casing, the pole core includes a pole core body having a first expansion end, and the first expansion end is provided with a cooling structure fitting area and a relative a first expansion area protruding from the cooling structure fitting area, the first expansion area being at least partially received in the housing expansion cavity, and the cooling structure adaptation area is recessed relative to the first expansion area to form cooling Structure installation space.

According to some embodiments of the present application, the first expansion end is provided with the cooling structure fitting area located in the middle and the first expansion area respectively located on two sides of the cooling structure fitting area.

According to some embodiments of the present application, the first expansion end is provided with the first expansion area located in the middle and two cooling structure adaptation areas respectively located on both sides of the first expansion area.

According to some embodiments of the present application, the first expansion end is provided with three first expansion zones and two cooling structure adaptation zones, and the cooling structure adaptation zone is disposed in two adjacent ones. Between the first expansion areas.

According to some embodiments of the present application, the pole core body includes a plurality of the first expansion ends, and each of the first expansion ends is provided with the first expansion area and the cooling structure adaptation area.

According to some embodiments of the present application, the pole core body includes two first expansion ends respectively located at opposite ends of the pole core body, and each of the first expansion ends is provided with one of the cooling structures. The mating zone, the two cooling structure fitting zones are aligned or staggered from one another.

According to some embodiments of the present application, the pole core body includes a second expansion end, and the second expansion end is provided with a pole fitting region and a second expansion region protruding relative to the pole fitting region. The pole fitting region is recessed relative to the second expansion region to form a pole mounting space.

According to some embodiments of the present application, the cover plate includes a cover body and a cover expansion cavity protruding relative to the cover body, and the second expansion area is at least partially received in the cover expansion cavity .

According to some embodiments of the present application, the battery unit includes a pole connected to the pole core body and extending out of the cover body, the pole being at least partially disposed on the pole In the installation space.

According to some embodiments of the present application, the pole core includes a tab connected to the pole core body, the tab being electrically connected to the pole.

According to some embodiments of the present application, the battery unit includes an inner lead piece disposed to be disposed inside the cover body, and the pole is connected to the tab through the inner lead piece.

According to some embodiments of the present application, the tab is disposed in the pole fitting region.

According to some embodiments of the present application, the tab is integrally formed with the pole core body.

In addition, the present application also provides a battery module, wherein the battery module includes the battery unit described in the above scheme.

In addition, the present application also provides an automobile, wherein the automobile includes at least one battery module described in the above aspect.

According to the above technical solution, in some surfaces of the pole core body, a cooling structure fitting area corresponding to the external cooling structure and a expansion area protruding relative to the cooling structure fitting area are respectively disposed, and correspondingly, the housing expansion area is disposed on the outer casing. The outer casing expands the cavity, thereby increasing the volume of the pole core body in a limited space near the external cooling structure, thereby increasing the battery capacity.

The additional aspects and advantages of the present invention will be set forth in part in the description which follows.

DRAWINGS

1 is a perspective view of a pole core according to an embodiment of the present application;

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

3 is a perspective view of a battery unit according to an embodiment of the present application;

4 is a perspective view of a cover plate according to an embodiment of the present application;

Figure 5 is a perspective view of the outer casing of the embodiment of the present application;

Figure 6 is a perspective view of a cover plate according to an embodiment of the present application;

7 is a schematic diagram of a battery module according to an embodiment of the present application;

8 is a schematic view of a car according to an embodiment of the present application.

Description of the reference numerals

100 battery unit 200 battery module

300 cars

1 pole core body 2 pole

3 housing 4 cover

5 pole 6 inner lead

11 Second expansion end 12 First expansion end

111 Second expansion area 112 pole fitting area

121 cooling structure adaptation zone 122 first expansion zone

31 Enclosure expansion chamber 32 opening

41 Cover expansion chamber 42 Cover body

Detailed ways

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting.

The present application provides a battery unit 100, wherein the battery unit 100 includes a housing 3, a cover plate 4 and a pole core, the housing 3 has an opening 32, and the housing 3 is provided with an outwardly projecting housing expansion chamber 31, the opening 32 is covered by the cover plate 4, the pole core is disposed in the outer casing 3, the pole core comprises a pole core body 1 having a first expansion end 12, the first expansion end 12 is provided with a cooling structure fitting area 121 and a first expansion area 122 protruding relative to the cooling structure fitting area 121, the first expansion area 122 being at least partially accommodated in the housing expansion chamber 31, The cooling structure fitting area 121 is recessed with respect to the first expansion area 122 to form a cooling structure installation space.

In the present solution, the cover 4 and the outer casing 3 together form a housing that houses the pole core. The pole core includes a pole core body 1 . One end of the pole core body 1 is a first expansion end 12 , and the first expansion end 12 is provided with a cooling structure fitting area 121 and a first expansion area 122. The first expansion area 122 is opposite. The cooling structure fitting area 121 is protruded to realize the expansion, and the space formed by the cooling structure fitting area 121 being recessed compared to the first expansion area 122 is a cooling structure installation space, and the cooling structure fitting area can be used for accommodating the pole At least a portion of the 5 is located in the pole mounting space.

In the application concept of the present solution, the end of the pole core body 1 and the external cooling structure is expanded, that is, the first expansion end 12, and the area of the first expansion end 12 that cooperates with the cooling structure (ie, the cooling structure fitting area) 121) The limitation of the cooling structure cannot be convex outward, and other areas have available space because they are not occupied by the cooling structure, so the pole core body 1 of this partial area is disposed to protrude outward, that is, the first expansion area 122. The falling space formed by the first expansion area 122 and the cooling structure matching area 121 is a cooling structure installation space for installing the cooling structure. Of course, the cooling structure may be all disposed in the cooling structure installation space, or may be only a part. Set in the cooling structure installation space.

As shown in FIG. 2, FIG. 3 and FIG. 4, in order to match the second expansion end 12 of the pole core body 1, one end of the outer casing 3 is also formed substantially in a shape corresponding to the first expansion end 12, that is, the casing expansion cavity 31 is formed. At least a portion of the first expansion zone 122 is received.

According to an embodiment of the present application, the first expansion end 12 is provided with the cooling structure fitting area 121 located in the middle and the first expansion of the two sides respectively located on the two sides of the cooling structure fitting area 121. Area 122. The intermediate portion of the first expansion end 12 needs to be size-limited in cooperation with the cooling structure, and the other regions are not restricted by the cooling structure, and may protrude outward to form two first expansion regions 122 on both sides of the cooling structure fitting region 121. The expansion is achieved by making full use of the space that is not occupied by the cooling structure.

According to an embodiment of the present application, the first expansion end 12 is provided with the first expansion area 122 located in the middle and two cooling structure adaptation areas respectively located on opposite sides of the first expansion area 122. 121. As shown in FIG. 1 , FIG. 2 and FIG. 3 , the first expansion end 12 needs to be matched with the cooling structure at the opposite edges and the size is limited, and the area at the intermediate position is not restricted by the cooling structure and can be convex outward. The first expansion area 122 is formed to fully utilize the space occupied by the cooling structure to achieve capacity expansion.

According to an embodiment of the present application, the first expansion end 12 is provided with three first expansion regions 122 and two cooling structure adaptation regions 121, and the cooling structure adaptation regions 121 are disposed adjacent to each other. Between the two first expansion regions 122. That is, the first expansion area 122 and the cooling structure adaptation area 121 are alternately arranged along a straight line, the two cooling structure fitting areas 121 are spaced apart, and each of the cooling structure fitting areas 121 is provided with a first side. When the expansion area 122 has an unoccupied space on both sides of the cooling structure fitting area 121, the first expansion area 122 can be correspondingly disposed.

In addition, the pole core body 1 includes a plurality of the first expansion ends 12, and each of the first expansion ends 12 is provided with the first expansion area 122 and the cooling structure adaptation area 121. When the battery unit 100 is cooled by the cooling structure at different ends, correspondingly, the pole core body 1 may also be provided with a plurality of first expansion ends 12, and each of the first expansion ends 12 is provided with a cooling structure fitting area 121 and the first Expansion area 122.

In some embodiments, the pole core body 1 includes two first expansion ends 12 respectively located at opposite ends of the pole core body 1, and each of the first expansion ends 12 is provided with one of the cooling structures. The adaptation area 121, the two cooling structure adaptation areas 121 are aligned or staggered from each other. Both of the expansion ends 12 are provided with a cooling structure fitting area 121, and the two cooling structure fitting areas 121 are aligned or offset from each other.

In addition, the pole core body 1 includes a second expansion end 11 , and the second expansion end 11 is provided with a pole fitting area 112 and a second expansion area 111 protruding relative to the pole fitting area 112 . The pole fitting region 112 is recessed relative to the second expansion region 111 to form a pole mounting space. The second expansion end 11 is provided to accommodate the pole 5 (described below) of the battery unit 100. The pole fitting area 112 is used to fit the pole 5 and is limited in size. In other areas, the second expansion end 11 is convex outward. The pole mounting space formed by forming the second expansion area 111 and the pole fitting area 112 is recessed relative to the second expansion area can be used for mounting the pole.

In addition, the cover plate 4 includes a cover body 42 and a cover expansion chamber 41 protruding relative to the cover body 42. The second expansion area 111 is at least partially received in the cover expansion chamber 41. . The cover plate 4 is used to cover the second expansion end 11 , and as shown in FIG. 5 and FIG. 6 , the cover plate 4 has a shape corresponding to the second expansion end 11 , that is, a cover expansion chamber 41 that protrudes outward is formed, and the cover is formed. The plate expansion chamber 41 can accommodate at least a portion of the second expansion area 111, and the cover body 42 corresponds to the pole alignment area 112.

In addition, the battery unit 100 includes a pole 5 connected to the pole core body 1 and extending through the cover body 42 , the pole 5 being at least partially disposed on the pole In the installation space. Generally, the battery unit 100 includes two poles 5 respectively electrically connected to the pole core body 1, and the poles 5 extend through the cover body 42 to the outside, and the poles 5 may all be disposed in the pole mounting space. At this time, the height of the pole 5 may be less than or equal to the height of the second expansion area 111. Of course, the pole 5 may also be partially disposed in the pole mounting space, and the height of the pole 5 may be greater than the second expansion. The height of zone 111.

In addition, the pole core comprises a tab 2 connected to the pole core body 1, the tab 2 being electrically connected to the pole 5. The pole core body 1 may be provided with two tabs 2 corresponding to the positive and negative poles, respectively, and the two tabs 2 are respectively connected to the two poles 5.

In some embodiments, the battery unit 100 includes an inner lead piece 6 disposed to be disposed inside the cover body 42 , and the pole 5 is connected to the tab 2 through the inner lead piece 6 . As shown in FIG. 6, the inner lead piece 6 is disposed on the inner side of the cover body 42, the pole 5 is connected to the inner lead piece 6 through the cover body 42, and the tab 2 is connected to the inner lead piece 6, thereby realizing the pole The electrical connection between the ear 2 and the pole 5, through the inner lead-out piece 6 as a transition, can increase the contact area of the tab 2 and the pole 5. The tab 2, the inner lead piece 6, and the pole 5 are each made of a conductive material.

The tab 2 is disposed in the pole fitting region 112. The tabs 2 may all be disposed in the pole fitting region 112, or only partially in the pole fitting region 112, the tab 2 may be connected to the pole fitting region 112, or connected to the second expansion region 111 or pole The other positions of the core body 1 extend to the pole fitting region 112 so as to be connectable to the pole 5.

According to some embodiments of the present application, the tab 2 is integrally formed with the pole core body 1. The tab 2 and the pole core body 1 are integrally formed of a material made into a pole core, and the tab 2 includes two tabs as a positive electrode and a negative electrode. Of course, in other embodiments, the tab 2 can be additionally fabricated and attached to the pole core body 1.

In addition, as shown in FIG. 7 , the present application further provides a battery module 200 , wherein the battery module 200 includes the battery unit 100 described in the above scheme. The battery module 200 may include a plurality of the battery cells 100, and the plurality of battery cells 100 are connected in series or in parallel to supply power.

In addition, as shown in FIG. 8, the present application further provides an automobile 300, wherein the automobile 300 includes at least one battery module 200 according to the above aspect.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the indications of "radial", "circumferential", etc., is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present application and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more unless specifically and specifically defined.

In the present application, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood on a case-by-case basis.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

While the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the present application. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A battery unit (100), characterized in that the battery unit (100) comprises a casing (3), a cover plate (4) and a pole core, the casing (3) having an opening (32), the casing ( 3) provided with an outwardly projecting housing expansion chamber (31), the opening (32) being covered by the cover plate (4), the pole core being disposed in the outer casing (3), the pole The core comprises a pole core body (1) having a first expansion end (12), the first expansion end (12) being provided with a cooling structure fitting zone (121) and with respect to the cooling structure fitting zone (121) a protruding first expansion area (122), the first expansion area (122) being at least partially received in the housing expansion chamber (31), the cooling structure adaptation area (121) being opposite to the first expansion area (122) recessed to form a cooling structure mounting space.
The battery unit (100) according to claim 1, wherein the first expansion end (12) is provided with the cooling structure fitting area (121) located in the middle and two cooling structures respectively located at the cooling structure The first expansion area (122) on both sides of the adaptation area (121).
The battery unit (100) according to claim 1 or 2, wherein the first expansion end (12) is provided with the first expansion area (122) in the middle and two respectively located in the first The cooling structure fitting area (121) on both sides of a expansion area (122).
The battery unit (100) according to claim 3, wherein the first expansion end (12) is provided with three first expansion zones (122) and two cooling structure adaptation zones (121). The cooling structure fitting area (121) is disposed between two adjacent first expansion areas (122).
The battery unit (100) according to any one of claims 1 to 4, wherein the pole core body (1) comprises a plurality of the first expansion ends (12), each of the first The expansion end (12) is provided with the first expansion area (122) and the cooling structure adaptation area (121).
The battery unit (100) according to claim 5, wherein the pole core body (1) comprises two first expansion ends (12) respectively located at opposite ends of the pole core body (1) Each of the first expansion ends (12) is provided with one cooling structure fitting area (121), and the two cooling structure fitting areas (121) are aligned or offset from each other.
The battery unit (100) according to any one of claims 1 to 6, characterized in that the pole core body (1) comprises a second expansion end (11), and the second expansion end (11) is arranged a pole fitting region (112) and a second expansion region (111) protruding relative to the pole fitting region (112), the pole fitting region (112) being expanded relative to the second The region (111) is recessed to form a pole mounting space.
The battery unit (100) according to claim 7, wherein the cover (4) comprises a cover body (42) and a cover expansion chamber protruding relative to the cover body (42) ( 41) The second expansion zone (111) is at least partially received in the cover expansion chamber (41).
The battery unit (100) according to claim 8, characterized in that the battery unit (100) comprises a pole (5), the pole (5) being connected to the pole core body (1) and extending The cover body (42) is passed through, and the pole (5) is at least partially disposed in the pole mounting space.
The battery unit (100) according to claim 9, wherein the pole core comprises a tab (2) connected to the pole core body (1), the tab (2) being electrically connected to the Said pole (5).
The battery unit (100) according to claim 10, wherein the battery unit (100) comprises an inner lead piece (6) disposed on an inner side of the cover body (42), the pole (5) being connected to the tab (2) by the inner lead piece (6).
The battery unit (100) according to claim 10, characterized in that the tab (2) is disposed in the pole fitting region (112).
The battery unit (100) according to claim 10, characterized in that the tab (2) is integrally formed with the pole core body (1).
A battery module (200), characterized in that the battery module (200) comprises the battery unit (100) according to any one of claims 1-13.
A vehicle (300), characterized in that the vehicle (300) comprises at least one battery module (200) according to claim 14.