CN216015510U

CN216015510U - Battery cell shell, single battery and battery pack

Info

Publication number: CN216015510U
Application number: CN202122069277.8U
Authority: CN
Inventors: 戴亨伟; 张立鹏; 林秀德; 胡春波; 肖谋远; 杨伟; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-03-11
Anticipated expiration: 2031-08-30

Abstract

The application discloses electric core casing, battery cell and battery package, electric core casing include main part, first locating part and second locating part, and first locating part sets up respectively in the relative both sides of main part with the second locating part along the width direction of main part, and wherein, first locating part can cooperate with the second locating part of adjacent electric core casing to the displacement of at least one side in length direction, direction of height and the width direction of restriction electric core casing. Can carry on spacingly through the cooperation of first locating part and second locating part between the electric core casing, can reduce the use of outside locating part, help reducing the whole volume and the component quantity of battery package.

Description

Battery cell shell, single battery and battery pack

Technical Field

The application relates to the technical field of power batteries, in particular to a battery cell shell, a single battery and a battery pack.

Background

In the field of power batteries, a plurality of single batteries are generally mounted in a battery cell shell to form a battery pack. In order to achieve stable placement of each single battery, the battery pack in the related art further includes a limiting structure, and the single batteries are positioned in all directions through the limiting structure, so that the number of components of the battery pack is increased, and the volume of the battery pack is also increased.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a battery cell shell, which can reduce the number of components of a battery pack and reduce the volume of the battery pack.

This application has still provided the monomer battery and the battery package of using above-mentioned electricity core casing.

According to the first embodiment of the present application, a cell casing:

a main body;

the first limiting piece is arranged on one side of the main body along the width direction of the main body;

the second limiting piece is arranged on the other side, opposite to the main body, in the width direction;

the first locating part can be matched with the second locating part of the adjacent battery cell shell to limit displacement of the battery cell shell in at least one direction of the length direction, the height direction and the width direction.

According to the cell shell of the embodiment of the application, at least the following beneficial effects are achieved:

can carry on spacingly through the cooperation of first locating part and second locating part between the electric core casing, can reduce the use of outside locating part, help reducing the whole volume and the component quantity of battery package.

According to some embodiments of the present application, at least one of the first limiting member and the second limiting member extends along the length direction;

along direction of height, first locating part with second locating part dislocation set, just first locating part can with adjacent the second locating part butt of electricity core casing is followed to the restriction electricity core casing the displacement of direction of height.

According to some embodiments of the present application, the cell casing further includes a third limiting member, the third limiting member and the first limiting member are disposed at the same side of the main body, and can be fastened to the second limiting member of the cell casing to limit the displacement of the cell casing in the width direction.

According to some embodiments of the application, the second limiting member comprises a first protruding portion and a second protruding portion, the first protruding portion is disposed on the rear side of the main body, and the second protruding portion is disposed on the upper side or the lower side of the main body:

the third limiting part comprises a third connecting part and a third buckling part, the third connecting part is connected to the main body and can elastically move along the height direction, and the third buckling part is connected to the third connecting part;

the first locating part can abut against the first protruding part of the cell shell, and the third locating part can abut against the second protruding part of the cell shell.

the first limiting piece comprises a first connecting part and a first buckling part, the first connecting part is connected to the main body, the first buckling part is connected to the first connecting part, and a first groove is defined by the first buckling part, the first connecting part and the main body;

the second limiting piece comprises a second connecting part and a second buckling part, the second connecting part is connected to the main body, the second buckling part is connected to the second connecting part, and a second groove is defined by the second buckling part, the second connecting part and the main body;

the first buckling parts can be inserted into the second grooves of the adjacent cell shells in a plugging mode, and the first grooves are used for accommodating the second buckling parts of the adjacent cell shells so as to limit displacement of the cell shells in the height direction and the width direction.

the first limiting piece comprises a fourth connecting part and a fourth buckling part, the fourth connecting part is connected to the main body, and the fourth buckling part is connected to the fourth connecting part;

the second limiting part is provided with a limiting cavity which is communicated along the length direction and an opening which is communicated with the limiting cavity, and the maximum size of the fourth buckling part is larger than that of the opening along the height direction;

the fourth connecting portion can penetrate through the opening of the adjacent battery cell shell, and the fourth buckling portion can be inserted into the limiting cavity of the adjacent battery cell shell to limit the displacement of the battery cell shell in the height direction and the width direction.

According to some embodiments of the present application, the first limiting member and the second limiting member are at least two, and along the height direction, at least two of the first limiting members are respectively disposed at two ends of the main body, and at least two of the second limiting members are respectively disposed at two ends of the main body.

According to some embodiments of the present application, at least one of the first limiting member and the second limiting member is disposed along the height direction, and along the length direction, the first limiting member and the second limiting member are disposed in a staggered manner, and the first limiting member can abut against the second limiting member of the cell casing to limit the displacement of the cell casing along the length direction.

A unit cell according to a second embodiment of the present application includes:

the battery cell shell;

and the battery core is positioned in the battery core shell.

A battery pack according to a third embodiment of the present application includes:

a battery case;

the single batteries are arranged in a plurality of battery shells, and are positioned in the battery shells, and the adjacent single batteries are matched with each other through the first limiting part and the second limiting part to limit.

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

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a perspective view illustrating a unit cell according to the related art;

fig. 2 is an exploded view of a battery pack according to the related art;

fig. 3 is a schematic perspective view of a cell casing according to a first embodiment of the present application;

fig. 4 is a side view of the cell casing of fig. 1;

fig. 5 is a sectional view of an assembled battery cell employing the cell casing of fig. 3;

FIG. 6 is an enlarged view of area A of FIG. 5;

FIG. 7 is a schematic view of the assembly of the single cell of the present application;

FIG. 8 is a schematic view of another assembly of the cell of the present application;

fig. 9 is a sectional view of an assembled battery cell using a cell casing according to a second embodiment of the present application;

FIG. 10 is an enlarged view of area B of FIG. 9;

fig. 11 is an enlarged schematic view of an alternative assembly of the cell of fig. 9;

FIG. 12 is an enlarged schematic view of an alternative assembly of the cell of FIG. 9;

fig. 13 is a sectional view of an assembled battery cell using a cell casing according to a third embodiment of the present application;

FIG. 14 is an enlarged view of area C of FIG. 13;

fig. 15 is a cross-sectional view of an alternative assembly of the cell of fig. 13;

FIG. 16 is an enlarged view of area D of FIG. 15;

FIG. 17 is a cross-sectional view of an alternative assembly of the cell of FIG. 13;

FIG. 18 is an enlarged view of area E of FIG. 17;

FIG. 19 is an enlarged schematic view of an alternative assembly of the cell of FIG. 13;

FIG. 20 is an enlarged schematic view of an alternative assembly of the cell of FIG. 13;

fig. 21 is a schematic perspective view of a cell casing according to a fourth embodiment of the present application;

fig. 22 is an assembled top view of a battery cell employing the cell casing of fig. 21.

Reference numerals:

a cell casing 100;

a main body 110, a front side 111, a rear side 112, an upper side 113;

a first limiting member 120, a first connecting portion 121, a first fastening portion 122, a first groove 123, a fourth connecting portion 124, and a fourth fastening portion 125;

the second limiting member 130, the first protrusion 131, the second protrusion 132, the second connecting portion 133, the second fastening portion 134, the second groove 135, the limiting cavity 136, and the opening 137;

a third limiting member 140, a third connecting portion 141, and a third fastening portion 142;

a battery pack 200;

a lateral stop 210;

a top stop 220.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present application is applicable to a single battery having a large length-thickness ratio, and a typical structure of the single battery is as shown in fig. 1, and the single battery is a rectangular body, and a dimension in a length direction (for example, a dimension in a left-right direction in fig. 1) is larger than a dimension in a height direction (for example, a dimension in a vertical direction in fig. 1), and is larger than a dimension in a width direction (for example, a dimension in a left-right direction in fig. 1), so that the single battery is overall in an elongated shape.

As shown in fig. 2, a common method for combining the unit cells into the battery pack 200 includes arranging a plurality of unit cells in a width direction because the size of the unit cells in the width direction is minimized. As can be seen from the illustration, the cells are not constrained in other directions except in the downward direction (the cells are able to contact the support structure of the base at all times under the influence of gravity). In order to achieve stable placement of each battery cell, the battery cells need to be limited from the top, the left, the right, the front and the rear, and a common method in the related art is to limit the battery cells by an external limiting member, for example, a lateral limiting member 210 is disposed laterally of each battery cell to limit the battery cells from the left, the right, the front and the rear, and a top limiting member 220 is disposed above each battery cell to limit the battery cells from the top.

Based on the above, the present application provides a battery cell casing 100, the limit structure through casing self realizes spacing between the casings, can reduce the use of outside locating part, helps reducing the whole volume and the component quantity of battery package 200. Referring to fig. 3 and 4, the battery cell casing 100 of the present embodiment includes a main body 110, a first limiting member 120 and a second limiting member 130, where the main body 110 is used for accommodating internal structures of batteries such as battery cells, and the first limiting member 120 and the second limiting member 130 are both connected to the main body 110 for limiting the positions of the batteries.

Taking the illustration as an example, the main body 110 is a rectangular casing, a cavity for accommodating the battery cell is formed inside the main body 110, the main body 110 is a long strip structure, that is, the size in the length direction is much larger than the size in the width direction, and openings are formed at the left and right ends of the main body 110. The first limiting member 120 and the second limiting member 130 are disposed opposite to each other, specifically, disposed along the width direction of the battery cell casing 100, the first limiting member 120 is disposed on one side (e.g., the front side 111 in fig. 3) of the main body 110, and the second limiting member 130 is disposed on the other side (e.g., the back side 112 in fig. 3) of the main body 110, because the main body 110 is a strip-shaped structure, the area of the side surfaces (e.g., the front side 111 and the back side 112 in the drawing) in the width direction is much larger than the area of the side surfaces in the other direction, so that a sufficient space can be provided for the setting of the limiting members, and meanwhile, the arrangement of the limiting members on both sides in the width direction can also be adapted to the layout manner that the single batteries are arranged along the width direction.

It should be noted that, the terms "one side" and "the other side" are only used to indicate the relative position relationship between the first limiting member 120 and the second limiting member 130, and it is not limited that the first limiting member 120 is completely located on the front side 111 of the main body 110, and the second limiting member 130 is completely located on the rear side 112 of the main body 110, and depending on the limiting manner, the limiting members may extend to or completely located on other adjacent sides, for example, a part of the second limiting member 130 is located on the rear side 112, and the other end is located on the upper side 113, and the specific form will be described below with reference to the drawings and the specific embodiments.

Adjacent cell shells 100 are mutually limited by limiting parts, for example, three cell shells 100 that are adjacently arranged in the width direction are taken as an example, the first limiting part 120 of the middle cell shell 100 is matched with the second limiting part 130 of the front cell shell 100, the second limiting part 130 of the middle cell shell 100 is matched with the first limiting part 120 of the rear cell shell 100, and based on the limiting relation, the limiting parts can limit the displacement in at least one direction of the length direction, the height direction and the width direction of the cell shell 100. It should be noted that, the length direction, the height direction and the width direction all include two specific directions, the limitation to the length direction, the height direction or the width direction referred to in the present application may include a case of limiting only one of the specific directions, taking the height direction as an example, which includes a vertically upward direction and a vertically downward direction (as shown in fig. 6), and the limitation to the height direction by the limiting member may be interpreted as a limitation to only the upward direction. It can be understood that, as long as the limiting part can limit the displacement in a specific direction, the external limiting structure in the direction can be omitted, so as to achieve the purposes of reducing the volume and simplifying the structure.

Based on the above, the battery cell casing 100 may be provided with at least one first limiting member 120 and one second limiting member 130 to limit displacement in at least one specific direction. Of course, in order to balance the stress and enhance the limiting effect, the number of the limiting members is usually increased, taking fig. 3 as an example, the front side 111 of the main body 110 is provided with two first limiting members 120, the rear side 113 is provided with two second limiting members 130, and the two first limiting members 120 and the two second limiting members 130 cooperate to completely limit the displacement in the height direction. It should be noted that the number of the first limiting members 120 and the second limiting members 130 can also be adjusted according to needs, for example, the battery cell casing 100 may be provided with more than three first limiting members 120 and second limiting members 130.

In addition, as a specific arrangement manner of the above-mentioned limiting members, at least one of the first limiting member 120 and the second limiting member 130 extends along the longitudinal direction of the cell casing 100, and since the size of the cell casing 100 in the longitudinal direction is large, deformation is easily generated in the longitudinal direction, and the limiting member extending along the longitudinal direction can be used as a reinforcing structure of the main body 110, so that the rigidity of the cell casing 100 in the longitudinal direction is enhanced, and the amount of deformation is reduced. The specific arrangement manner of the limiting member includes, but is not limited to, the following combinations: a. the first limiting member 120 extends continuously along the length direction, and the extending distance is long, and the second limiting member 130 has a small size along the length direction; b. the first limiting member 120 and the second limiting member 130 both extend continuously along the length direction; c. the first position-limiting member 120 includes a plurality of sub-position-limiting members spaced apart along the length direction. Wherein, the better setting mode is that first locating part 120 and second locating part 130 all extend along above-mentioned length direction in succession, and the length of the two equals with main part 110's length, thereby can further increase main part 110's intensity, cell casing 100 also can be through extrusion's mode integrated into one piece, need not to carry out independent processing to the locating part, help simplifying the forming process, in addition, because the locating part all extends to main part 110's tip along left right direction, consequently adjacent cell casing 100 both can be followed left end butt joint, also can follow right end butt joint, it is more convenient to assemble.

In general, the present application performs mutual limiting through the limiting members on the cell casing 100, so as to reduce the usage of the external limiting structure, which will be described below with reference to various embodiments.

First embodiment

Referring to fig. 3 to 6, schematic diagrams of a single cell casing 100 and schematic diagrams of single cells using the cell casing after being arranged along a width direction are respectively shown, wherein two first limiting members 120 are provided, and are both located on a front side surface of the main body 110 and are sequentially provided along a height direction of the cell casing 100; the two second limiting members 130 are also disposed on the rear side of the main body 110, and are sequentially disposed along the height direction of the cell casing 100.

Along the height direction of the cell shells 100, the first limiting members 120 and the corresponding second limiting members 130 are disposed in a staggered manner, specifically as shown in fig. 4, a minimum distance H1 between the two second limiting members 130 along the height direction is equal to or slightly greater than a maximum distance H2 between the two first limiting members 120, so that, when two adjacent cell shells 100 are matched in the manner shown in fig. 6, an upper side of the upper first limiting member 120 abuts against a lower side of the upper second limiting member 130, and similarly, a lower side of the lower first limiting member 120 abuts against an upper side of the upper second limiting member 130, so that the two cell shells 100 are mutually limited, and displacement in the height direction (including upward and downward directions) does not occur. Of course, since the first limiting members 120 and the corresponding second limiting members 130 are disposed in a staggered manner, when the first limiting members 120 limit upward displacement, the second limiting members 130 limit downward displacement, and vice versa, in an alternative manner of the present embodiment, only one first limiting member 120 and one second limiting member 130 may be disposed, so that complete limiting of the cell casing 100 in the height direction can be achieved, and in addition, since the first limiting member 120 may abut against the rear side surface 112 of the adjacent cell casing 100, the second limiting member 130 may abut against the front side surface 111 of the adjacent cell casing 100, so that the adjacent cell casings 100 cannot approach each other any more (but can be freely separated from each other in the width direction) after approaching a certain distance in the width direction, that is, the present embodiment may also achieve incomplete limiting in the width direction.

In this embodiment, the cross sections of the first limiting member 120 and the second limiting member 130 are rectangular, so that the contact portions of the first limiting member and the second limiting member are flat surfaces, which is helpful for ensuring a certain contact area, thereby ensuring a limiting effect. Two locating parts all extend along length direction is continuous, and length equals the length of main part 110, so, this embodiment provides two kinds of assembly methods: one is to fix one cell casing 100 and then move the other cell casing 100 in the length direction (arrow direction in fig. 7) until the two are aligned; secondly, one of the cell casings 100 is fixed, and then the other cell casing 100 is moved in the width direction (arrow direction in fig. 8) until the two are attached to each other, which can shorten the moving distance of the cell casing 100.

In addition, as shown in the figure, due to the existence of the limiting member, a gap may be generated between the adjacent cell shells 100, and the gap may be used as a space for expansion and deformation of the single batteries, that is, the limiting member provided by the cell shell 100 itself in the embodiment is used as a partition member between the single batteries, and compared with a scheme in which the single batteries are partitioned by a separate partition member in the related art, the number of components of the battery pack may be further simplified, and the workload of assembling the partition member may be reduced. In addition, in order to better avoid the deformed portion of the unit battery, the stopper is provided at the end of the main body 110 in the height direction.

Second embodiment

The limiting member in the first embodiment can only achieve limiting in the height direction and incomplete limiting in the width direction, and this embodiment is based on the improvement of the first embodiment, and can achieve complete limiting in the width direction on the basis of achieving complete limiting in the height direction. Referring to fig. 9 and 10, the main body 110 and the first limiting member 120 of the cell casing 100 are the same as those of the first embodiment, and are not described in detail herein. The differences between this embodiment and the first embodiment include: a third limiting member 140 is further provided, the third limiting member 140 and the first limiting member 120 are disposed on the same side of the main body 110, and the third limiting member 140 can be fastened to the second limiting member 130 of the adjacent cell casing 100 to limit the mutual distance of the cell casings 100 along the width direction.

As a specific implementation manner of the present embodiment, the second limiting member 130 includes a first protrusion 131 and a second protrusion 132 integrally connected, the first protrusion 131 and the second protrusion 132 are located on two adjacent side surfaces of the main body 110 (that is, the limiting member is not limited to a certain side surface), taking the upper second limiting member 130 in fig. 10 as an example, the first protrusion 131 is disposed on the rear side surface 112 of the main body 110 and has a first limiting surface parallel to the upper side surface 113, and the second protrusion 132 is disposed on the upper side surface 113 of the main body 110 and has a second limiting surface parallel to the rear side surface 112. The first limiting member 120 is located on the front side surface 111, the third limiting member 140 is located on the upper side surface 113, the third limiting member 140 includes a third connecting portion 141 and a third buckling portion 142, one end of the third connecting portion 141 is connected to the front side surface 111, the other end extends in a direction away from the main body 110, and the third buckling portion 142 is connected to a distal end of the third connecting portion 141. During matching, the upper side surface of the first limiting part 120 abuts against the first limiting surface of the first protrusion 131 on the adjacent cell shell 100 to limit the cell in the height direction, the third buckling part 142 of the third limiting part 140 is buckled on the second limiting surface of the second protrusion 132 on the adjacent cell shell 100, and the abutting action of the limiting part and the adjacent shell front side surface 111 or the rear side surface 112 is matched, so that each cell shell 100 can not be close to each other or away from each other along the width direction, and complete limitation in the width direction is realized.

It should be noted that, in order to achieve a better clamping effect, a certain length needs to be ensured for both the third connecting portion 141 and the third buckling portion 142 of the third limiting member 140, and if the buckling portion is disposed between the adjacent cell shells 100, a gap between the adjacent cell shells 100 may be increased (as shown in fig. 11), so as to increase the overall volume of the battery pack, and in this embodiment, since the second protruding portion 132 is located on the upper side 113 of the main body 110, the gap between the adjacent cell shells 100 is not affected by the lengths of the third limiting member 140 and the second protruding portion 132, so as to ensure that there is a sufficient battery deformation space, the gap width between the cell shells 100 may be reduced. Of course, the above description does not mean that the present application excludes the solution of disposing the fastening portions of the third fastening portion 142 and the second protruding portion 132 between the adjacent cell casings 100, for example, as shown in fig. 11, the second limiting member 130 may be completely located on the rear side surface 112, and the third limiting member 140 may be completely located on the front side surface 111.

The first limiting member 120, the second limiting member 130 and the third limiting member 140 all extend along the length direction of the main body 110, and the lengths are equal to the length of the main body 110, so the assembly can be performed by adopting the method of fig. 7. It can be understood that, since the third limiting member 140 and the first limiting member 120 are separated to limit the position, the third limiting member 140 does not need to bear the acting force in the height direction, and the third limiting member 140 is a cantilever structure, the third connecting portion 141 can be an elastic member that can deform along the height direction, so that the present embodiment can also be assembled in the manner shown in fig. 8, that is, when the third fastening portion 142 passes over the second protruding portion 132, the third connecting portion 141 can deform, and when the third fastening portion 142 completely passes over the second protruding portion 132, the third connecting portion 141 resets to realize the fastening action of the third fastening portion 142. As described above, the present embodiment has the following effects: the full limit in the width direction and the height direction can be realized, and the integral limit effect is better; the gap between adjacent cell shells 100 can be reduced as much as possible, so that the overall volume of the battery pack is reduced; can assemble along width direction, it is convenient to assemble.

In order to facilitate the third fastening portion 142 to pass over the second protruding portion 132, the second protruding portion 132 and the third fastening portion 142 are both provided with an arc surface or an inclined surface.

As another specific implementation manner of the present embodiment, referring to fig. 12, the first protrusion 131 and the second protrusion 132 may be two independent structures.

Third embodiment

In this embodiment, the first limiting member 120 can be fastened to the second limiting member 130 of the adjacent cell casing 100, and compared with the first embodiment, the first limiting member 120 can limit the displacement of the cell casing 100 along the height direction and the width direction through the fastening relationship therebetween, and compared with the second embodiment, the third limiting member 140 is not required.

As a specific implementation manner of this embodiment, referring to fig. 13 and 14, the first limiting member 120 includes a first connection portion 121 and a first buckling portion 122, one end of the first connection portion 121 is connected to the front side surface 111 of the main body 110, the other end of the first connection portion extends in a direction away from the main body 110, the first buckling portion 122 is connected to a far end of the first connection portion 121, and the first buckling portion 122, the first connection portion 121 and the main body 110 define a first groove 123. Similarly, the second limiting member 130 includes a second connecting portion 133 and a second fastening portion 134, one end of the second connecting portion 133 is connected to the rear side surface 112 of the main body 110, the other end of the second connecting portion extends in a direction away from the main body 110, the second fastening portion 134 is connected to a distal end of the second connecting portion 133, and the second fastening portion 134, the second connecting portion 133 and the main body 110 define a second groove 135;

during matching, the first limiting part 120 and the second limiting part 130 of the adjacent cell shells 100 are fastened to each other, specifically, taking three adjacent cell shells 100 as an example, the first fastening part 122 of the middle cell shell 100 is inserted into the second groove 135 of the front cell shell 100, and the second fastening part 134 of the middle cell shell 100 is inserted into the first groove 123 of the rear cell shell 100, so that complete limitation in the height direction and the width direction can be achieved simultaneously. Since the stopper in this embodiment needs to bear the acting forces in the width direction and the height direction, it is a rigid structure that is not easily deformed, and the assembly method shown in fig. 7 is generally adopted.

As another specific implementation manner of this embodiment, referring to fig. 15 and 16, the first limiting member 120 may adopt the structure of the third limiting member 140 in fig. 10, and the second limiting member 130 may also adopt the structure in fig. 10, that is, the complete limiting in the height direction and the width direction is realized by the fastening of the first limiting member 120 and the second protrusion 132 on the second limiting member 130, and the specific structure and the matching relationship thereof are described in detail in the second embodiment and will not be described herein.

It can be understood that, according to the different stress conditions of the single battery during the use process, the assembly manner of the present embodiment may be adjusted, specifically, if the single battery is subjected to a small acting force along the height direction during the use process, the first limiting member 120 may adopt an elastic structure similar to the third limiting member 140, so that the assembly may be performed in the manner shown in fig. 7 and 8; if the single battery is subjected to a large force in the height direction during use, the first limiting member 120 may be reinforced (e.g., thickened) to be a rigid structure, so that it may be assembled in the manner shown in fig. 7.

As another specific embodiment of the present embodiment, referring to fig. 17 and 18, the first limiting member 120 of the present embodiment includes a fourth connecting portion 124 and a fourth buckling portion 125, one end of the fourth connecting portion 124 is connected to the front side surface 111 of the main body 110, the other end of the fourth connecting portion extends in a direction away from the main body 110, and the fourth buckling portion 125 is connected to a distal end of the fourth connecting portion 124.

The second limiting member 130 is connected to the rear side surface 112 of the main body 110, and has a limiting cavity 136 and an opening 137, the limiting cavity 136 is the second limiting member 130 penetrating along the length direction, so that inlets for the first limiting member 120 to enter are formed at both left and right ends of the second limiting member 130, and the opening 137 is communicated with the limiting cavity 136 and is disposed at one end of the second limiting member 130 away from the main body 110. Wherein, along the height direction, the following magnitude relation exists: the maximum height of the fourth fastening part 125 is greater than the maximum height of the fourth connecting part 124, the maximum height of the limiting cavity 136 is greater than the maximum height of the opening 137, the maximum height of the fourth connecting part 124 is less than the maximum height of the opening 137, and the maximum height of the fourth fastening part 125 is less than the maximum height of the limiting cavity 136 and greater than the maximum height of the opening 137.

During matching, the first limiting member 120 slides into the second limiting member 130 from the left end or the right end of the adjacent cell casing 100, so that the fourth connecting portion 124 penetrates through the opening 137 of the adjacent second limiting member 130, and the fourth buckling portion 125 is located in the limiting cavity 136 of the adjacent second limiting member 130, because the maximum height of the fourth buckling portion 125 is greater than the maximum height of the opening 137, and under the abutting action of the cavity wall of the limiting cavity 136, the fourth buckling portion 125 cannot be separated from the limiting cavity 136 along the height direction and the width direction, and thus, the displacement of the cell casing 100 along the height direction and the width direction can be limited. Compared with the scheme shown in fig. 14, the limiting surface of the embodiment is more, and a better limiting effect can be provided.

In the present embodiment, both ends of the fourth fastening portion 125 in the height direction exceed the fourth connection portion 124, and it can be understood that only one end of the fourth fastening portion 125 may exceed the fourth connection portion 124, for example, as shown in fig. 19, and of course, the cross-sectional shape of the fourth fastening portion 125 is not limited to a rectangle, and may be, for example, a circle as shown in fig. 20.

It should be noted that, although the above embodiments are described based on the limiting members extending along the length direction, the present application is not limited to this, and taking fig. 21 and fig. 22 as an example, the first limiting member 120 and the second limiting member 130 both extend along the height direction, and the first limiting member 120 and the second limiting member 130 are disposed in a staggered manner along the length direction, and the shape and the matching manner thereof are similar to those of the scheme shown in fig. 6, in this embodiment, after the assembly, the first limiting member 120 and the second limiting member 130 of the adjacent cell casing 100 abut against each other, so as to limit the displacement of the cell casing 100 along the length direction. It can be understood that, based on the fact that the limiting member extends in the height direction, the structure for adjusting the limiting member can achieve different limiting effects, for example, when the limiting member adopts the structure shown in fig. 14, the limiting of the cell casing 100 in the length direction and the width direction can be achieved.

The application also provides a single battery, which comprises a battery core, an end cover and the battery core shell 100 of each embodiment, wherein the battery core is installed in the battery core shell 100 and is packaged through the end cover. The cell and the end cap can adopt the known technology, and are not described in detail herein.

The application also provides a battery pack, which comprises a battery shell and the single batteries, wherein the plurality of single batteries are limited through the limiting parts and then are installed in the battery shell, and compared with the scheme shown in fig. 2, the battery pack provided by the application can at least save part of external limiting parts, so that the effects of reducing the size and simplifying the structure are achieved. Particularly, when the battery cell casing 100 adopts the schemes of fig. 10 to 20, only the displacement in the length direction between the single batteries is not limited, at this time, an adhesive may be applied to the lower surfaces of the single batteries, and the single batteries are connected to the battery case in an adhesive manner, that is, the displacement in the length direction of the single batteries is limited in an adhesive manner, so that an external limiting part may be completely omitted, and the effects of reducing the volume and simplifying the structure are further improved.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. Cell casing, its characterized in that includes:

a main body;

the first locating part can be matched with the second locating part of the adjacent battery cell shell to limit displacement of the battery cell shell in at least one direction of the length direction, the width direction and the height direction.

2. The cell casing of claim 1, wherein at least one of the first retaining member and the second retaining member extends along the length direction;

3. The cell casing of claim 2, further comprising a third limiting member, wherein the third limiting member and the first limiting member are disposed on the same side of the main body, and can be fastened to the second limiting member of the adjacent cell casing to limit the displacement of the cell casing in the width direction.

4. The cell casing of claim 3, wherein the second retaining member includes a first protruding portion and a second protruding portion, the first protruding portion is disposed on the rear side of the main body, and the second protruding portion is disposed on the upper side or the lower side of the main body:

5. The cell casing of claim 1, wherein at least one of the first retaining member and the second retaining member extends along the length direction;

6. The cell casing of claim 1, wherein at least one of the first retaining member and the second retaining member extends along the length direction;

7. The cell casing of any one of claims 2 to 6, wherein the number of the first limiting members and the number of the second limiting members are at least two, and along the height direction, the at least two first limiting members are respectively disposed at two ends of the main body, and the at least two second limiting members are respectively disposed at two ends of the main body.

8. The cell casing of claim 1, wherein at least one of the first limiting member and the second limiting member extends in the height direction, and the first limiting member and the second limiting member are disposed in a staggered manner in the length direction, and the first limiting member can abut against the second limiting member of the adjacent cell casing to limit the displacement of the cell casing in the length direction.

9. A battery cell, comprising:

the cell casing of any of claims 1 to 8;

and the battery core is positioned in the battery core shell.

10. A battery pack, comprising:

a battery case;

the single battery according to claim 9, wherein a plurality of single batteries are arranged, and are located in the battery housing, and adjacent single batteries are limited by the first limiting member and the second limiting member in cooperation.