CN215732110U

CN215732110U - Battery pack and electric equipment

Info

Publication number: CN215732110U
Application number: CN202121439384.9U
Authority: CN
Inventors: 黄立亮; 弓天蒙; 王鹏飞
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-02-01
Anticipated expiration: 2031-06-25

Abstract

The application discloses group battery and consumer. The sealing part of electric core includes first sealing, second sealing and third sealing, utmost point ear extends the electric core casing from first sealing, the both sides that the holding portion is relative are located to the second sealing, the third sealing extends and connects first sealing and second sealing from the second sealing, a plurality of electric cores of group battery include adjacent first electric core and second electric core, the utmost point ear of first electric core and second electric core is located same one side of group battery, the third sealing of first electric core sets up towards the third sealing of second electric core, the third sealing of second electric core sets up towards the third sealing of first electric core, be equipped with insulating first knot component between the third sealing of adjacent first electric core and second electric core. The aluminum-plastic film of the adjacent battery cell is separated by the first structural member, so that an electronic circulation loop between the aluminum-plastic film and the negative electrode of the battery cell is limited, and the electrochemical corrosion is improved.

Description

Battery pack and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack and electric equipment.

Background

In the group battery, the distance between a plurality of electric cores is nearer, and the side seal of electric core is out of shape easily, leads to the side seal overlap joint of adjacent electric core easily. Once the side seals of adjacent cells are connected, an electronic circulation loop is formed between the aluminum-plastic film and the negative electrode, and the aluminum-plastic film undergoes an oxidation reaction and forms an alloy together with ions (e.g., lithium ions) in the electrolyte, so that electrochemical corrosion occurs in the cells, and the safety performance of the cells and the battery pack is affected.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present application provide a battery pack and an electrical device, which are used to improve the problem of electrochemical corrosion caused by the connection of side seals of adjacent battery cells.

In a first aspect, embodiments of the present application provide a battery pack including a plurality of battery cells and a first structural member. A plurality of electric cores stack the setting along first direction, and electric core includes electrode subassembly, electric core casing and utmost point ear. The tabs are connected to the electrode assembly and lead out of the cell casing. The battery cell shell comprises a containing part for containing the electrode assembly and a sealing part extending outwards from the periphery of the containing part, the sealing part comprises a first sealing part, a second sealing part and a third sealing part, the tabs extend out of the battery cell shell from the first sealing part, the second sealing part is arranged on two opposite sides of the containing part along a second direction, the third sealing part extends from the second sealing part and is connected with the first sealing part and the second sealing part, and the second direction is perpendicular to the first direction. The multiple battery cells comprise a first battery cell and a second battery cell which are adjacent to each other, the lugs of the first battery cell and the lugs of the second battery cell are arranged on the same side of the battery pack, the third sealing part of the first battery cell is arranged towards the third sealing part of the second battery cell, and the third sealing part of the second battery cell is arranged towards the third sealing part of the first battery cell. The first structural member comprises an insulating material, and is disposed between the third seal portion of the adjacent first cell and the third seal portion of the second cell along the first direction.

The first structural member separates the aluminum plastic films of the adjacent first battery cell and the second battery cell, so that an electronic circulation loop between the aluminum plastic film of one battery cell and the negative electrode of the other battery cell is limited, electrochemical corrosion is improved, and the safety performance of the battery cells and the battery pack is improved.

Optionally, the battery pack further includes a casing for accommodating the plurality of battery cells, the casing includes a first wall, a second wall and a plurality of side walls, the first wall and the second wall are disposed opposite to each other along the third direction, the first structural member is disposed on the first wall, and the first structural member extends to between the third sealing portions of the adjacent first battery cell and the second battery cell along the second direction.

Optionally, the first structural member includes a first portion and a second portion, and the first portion is disposed between the third sealing portions of the adjacent first cell and the second cell, and the second portion is disposed between the first sealing portions of the adjacent first cell and the second cell in the first direction. Optionally, the first portion and the second portion are integrally an insulator in a plate-like structure, and have a small thickness, so that in a scenario of assembling the first wall with the side wall, the first structural member is facilitated to enter between the adjacent first cell and the second cell.

Optionally, along the first direction, an orthogonal projection of the third sealing portion is located in an orthogonal projection of the first portion, which is beneficial to completely isolating the third sealing portion of the adjacent first battery cell and the second battery cell by the first portion, and improves the isolation effect.

Optionally, in the third direction, the length of the portion of the first portion disposed between the third sealing parts is H1, the length of the portion of the second portion disposed between the first sealing parts is H2, and H1 < H2. In a scene that the first wall is assembled with the side wall along the third direction, the second portion firstly extends between the first sealing portions of the adjacent first battery cell and the second battery cell for realizing primary positioning, so that the first portion can enter between the third sealing portions of the adjacent first battery cell and the second battery cell.

Optionally, along the third direction, the length of the third sealing portion is H0, which satisfies: h1 ≧ 5% H0 can reduce adjacent third seal contact during manufacture or shipping.

Optionally, the first structural member further includes a third portion, the third portion connects the first portion and the second portion, and an inclined surface is provided on one side of the third portion facing the battery cell, and an acute angle is formed between the inclined surface and the second direction. In a scenario in which the first wall is assembled with the side wall in the third direction, the inclined surface facilitates guiding the first portion into between the third seals of adjacent first and second cells.

Optionally, the first wall includes a plurality of side plates forming an accommodating space, the first structural member is disposed in the accommodating space, and the first portion is connected to the side plates.

Optionally, the plurality of battery cells further include a third battery cell disposed adjacent to the second battery cell, a third sealing portion of the third battery cell is disposed opposite to the third sealing portion of the second battery cell, the battery pack further includes a second structural member disposed on the first wall, the second structural member is disposed between a sealing portion joint of the second battery cell and a sealing portion joint of the third battery cell along the first direction, and the sealing portion joint is a joint of the first sealing portion and the third sealing portion. The second structure may separate the aluminum-plastic film of the cell casing in the second cell and the third cell, improving electrochemical corrosion.

Optionally, in the first wall, the first structural member and the second structural member may be insulating plates formed integrally, the first structural member and the second structural member are sequentially arranged at intervals along the first direction, a through hole is formed between adjacent first structural members and second structural members, and a tab of the battery cell passes through the through hole and extends to the outside of the first wall. The through hole can be favorable to the quick heat dissipation of electricity core.

Optionally, the plurality of side walls includes a first side wall and a second side wall oppositely arranged along the second direction, and the first structural member is provided on at least one of the first side wall and the second side wall.

Optionally, the cell casing includes an aluminum plastic film.

Optionally, a through hole is formed between the adjacent first structural member and the second structural member, and the tab passes through the through hole and extends out of the housing.

Optionally, the second structural member includes a fourth portion and a fifth portion, and along the first direction, the fourth portion is disposed between a joint of the sealing portion of the second battery cell and a joint of the sealing portion of the third battery cell, and the fifth portion is disposed between the first sealing portion of the second battery cell and the first sealing portion of the third battery cell.

Optionally, in the first direction, an orthogonal projection of the sealing part connection is located within an orthogonal projection of the fourth portion.

Optionally, the first structural member and the second structural member each include a convex portion, the convex portion includes an inclined surface, and an included angle between the inclined surface and the third direction is an acute angle.

Optionally, along the third direction, the length of the protruding portion does not exceed the length of the portion, between the first sealing portions, of the second portion, and the tab can be guided in the assembling process, so that the tab can conveniently penetrate through the through hole.

Optionally, the plurality of battery cells are divided into a plurality of columns, each column of battery cells includes a plurality of groups, and each group includes a first battery cell and a second battery cell. The casing is equipped with the spacer, separates through the spacer between two adjacent electric cores. The spacing part can be used for separating the aluminum plastic films of two adjacent columns of battery cores and improving electrochemical corrosion.

Optionally, along the first direction, an orthogonal projection of a portion of the first portion, which is disposed between adjacent third sealing portions, is located within an orthogonal projection of the first sealing portion.

Optionally, the first structural member is made of an insulating material, such as plastic.

Optionally, the second structural member is made of an insulating material, such as plastic.

In a second aspect, an embodiment of the present application provides a power consumer, which includes a load and the battery pack described in any one of the above, where the battery pack supplies power to the load.

In the battery pack and the electric equipment, the insulating part is arranged between the side sealing parts of the adjacent electric cores, the aluminum plastic film of the adjacent electric cores is separated through the insulating part, and the electronic circulation loop between the aluminum plastic film and the negative pole is limited, so that the electrochemical corrosion is improved, and the safety performance of the electric cores and the battery pack is improved.

Drawings

Fig. 1 and 2 are schematic structural views of a battery pack according to an embodiment of the present application;

fig. 3 is a schematic diagram of a battery cell module and a casing after assembly according to an embodiment of the present application;

fig. 4 is a schematic cross-sectional view of the first structural member and the second structural member of an embodiment of the present application after being assembled with a cell module;

fig. 5 is another schematic cross-sectional view of the first structural member and the second structural member of an embodiment of the present application after being assembled with a cell module;

fig. 6 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

fig. 7 is a schematic diagram of the positions of two adjacent cells in the present application;

fig. 8 is a schematic diagram of positions of a plurality of cells in a cell module according to the present application;

FIG. 9 is a schematic view of a first wall of an embodiment of the present application;

FIG. 10 is an enlarged schematic view of the area indicated by the dashed line in FIG. 9;

FIG. 11 is a schematic view of the structure of the projection shown in FIG. 9;

fig. 12 is a partial schematic structural view of a battery pack according to another embodiment of the present application;

FIG. 13 is an enlarged schematic view of region I shown in dashed lines in FIG. 12;

fig. 14 is an enlarged schematic view of the region II shown by a dotted line in fig. 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in conjunction with the embodiments and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments, and not all embodiments. Based on the embodiments in the present application, the following respective embodiments and technical features thereof may be combined with each other without conflict.

In a particular scenario, the battery pack includes, but is not limited to, all kinds of primary, secondary, fuel cell, solar cell, and capacitor (e.g., supercapacitor) cells. The battery pack may preferably be a lithium secondary battery including, but not limited to, a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery. Any cell in the battery pack includes, but is not limited to, a pouch cell.

First embodiment

Referring to fig. 1 to 9, the battery pack 1 includes a cell module 10 and a first structural member 121. The cell module 10 includes a plurality of cells 11 stacked in the first direction x. The cell 11 includes an electrode assembly (not shown), a cell casing 12, and tabs 13. The tab 13 is connected to the electrode assembly and is led out of the cell casing 12. The first structural member 121 includes an insulating material. Optionally, the first structural member 121 is made of an insulating material, such as plastic. Optionally, the outer surface of the first structural member 121 is made of an insulating material.

The cell casing 12 includes a housing portion 12a for housing an electrode assembly (not shown), and a sealing portion 12b extending outward from the periphery of the housing portion 12 a. The sealing part 12b includes a first sealing part 12c, a second sealing part 12d, and a third sealing part 12e, the tab 13 extends out of the cell casing 12 from the first sealing part 12c, the second sealing part 12d is disposed at two opposite sides of the accommodating part 12a along the second direction y, and the third sealing part 12e extends from the second sealing part 12d and connects the first sealing part 12c and the second sealing part 12 d. The second direction y is perpendicular to the first direction x.

Referring to fig. 1 to 8, the arrangement of the plurality of battery cells 11 may be: two adjacent battery cells 11 are taken as a group, and the two battery cells 11 include a first battery cell 111 and a second battery cell 112. The third sealing portion 12e of the first cell 111 is disposed on the side of the first sealing portion 12c of the first cell 11 close to the second cell 112, and the third sealing portion 12e of the second cell 112 is disposed on the side of the first sealing portion 12c of the second cell 112 close to the first cell 111. The third sealing portion 12e of the first cell 111 is disposed toward the third sealing portion 12e of the second cell 112, and the third sealing portion 12e of the second cell 112 is disposed toward the third sealing portion 12e of the first cell 111.

In each grouping, the first structural member 121 is provided between the third sealing part 12e of the first cell 111 and the third sealing part 12e of the second cell 112 in the first direction x. The cell casing 12 includes an aluminum-plastic film, and the first structural member 121 may be configured to separate the aluminum-plastic films of the first cell 111 and the second cell 112, so as to limit an electronic circulation loop between the aluminum-plastic film of one cell and the negative electrode of the other cell, improve electrochemical corrosion, and facilitate improvement of safety performance of the cell 11 and the battery pack 1.

In the cell module 10, a plurality of cells 11 may be connected in series or in parallel to form an effective power supply and/or charging unit of the battery pack 1. The number of the battery cells 11 may be determined according to the demand of electric quantity. Alternatively, as shown in fig. 1 to 3, the tabs 13 of the plurality of battery cells 11 may be disposed on the same side of the battery pack 1, and herein, the tabs 12 of the first battery cell 111 and the second battery cell 112 are also disposed on the same side of the battery pack 1.

The battery cell 11 may further include an electrolyte solution or the like provided in the housing portion 12 a. In a scenario where the battery cell 11 includes positive and negative polarities, the electrode assembly includes a positive electrode plate, a negative electrode plate, and an isolation film disposed between the positive electrode plate and the negative electrode plate. The electrode assembly may be formed by winding or stacking a plurality of pole pieces, one end of the tab 13 extends into the cell casing 12 and is electrically connected to the pole piece with the corresponding polarity, and the other end of the tab 13 extends from the cell casing 12. The tab 13 includes a first tab 13a and a second tab 13b, the first tab 13a is a negative electrode tab, the second tab 13b is a positive electrode tab, the first tab 13a is electrically connected to the negative electrode tab and extends from the inside of the cell casing 12 to the outside of the cell casing 12, and the second tab 13b is electrically connected to the positive electrode tab and extends from the inside of the cell casing 12 to the outside of the cell casing 12. In other embodiments, the first tab 13a may be a positive tab and the second tab 13b may be a negative tab. The structure of the tab 13 of the present application will be described herein, taking one of them as an example.

The cell casing 12 may be used to form the shape of the cell 11, and may also be used to define the appearance of the cell 11. Internal components such as an electrode assembly and an electrolyte are housed in the housing portion 12a, and the battery cell case 12 protects the internal components, thereby improving the protective effect and safety of the battery cell 11.

The sealing portion 12b can be used to seal and restrict leakage of the electrolyte from the end portion and entry of impurities such as water and oxygen outside the cell casing 12 into the housing portion 12 a. The first sealing portion 12c may be used to seal a joint of the cell casing 12 and the tab 13.

Referring to fig. 1 to 5, the battery pack 1 further includes a casing 30 for accommodating a plurality of battery cells 11, the battery cell module 10 is generally rectangular, and optionally, the casing 30 includes a first wall 31, a second wall 32, and four sidewalls, including a first sidewall 331, a second sidewall 332, a third sidewall 333, and a fourth sidewall 334. The first wall 31 is disposed adjacent to the tab 13 of the battery cell 11, and the first wall 31 and the second wall 32 are disposed opposite to each other in the third direction z. Four sidewalls are connected between the first wall 121 and the second wall 122, the first sidewall 331 and the second sidewall 332 are oppositely disposed along the second direction y, the third sidewall 333 and the fourth sidewall 334 are oppositely disposed along the first direction x, the second direction y is perpendicular to the plane of the first direction x and the third direction z, and the first direction x and the third direction z can be perpendicular.

In some scenarios, the second wall 32 and the four side walls may be integrally formed structural members, and the first wall 31 is detachably connected to the side walls, so as to accommodate and protect the battery cell module 10. For example, as shown in fig. 1 to 3, the third side wall 333 and the fourth side wall 334 are provided with protrusions 33a, two sides of the first wall 31 along the first direction x are provided with insertion holes 31a, and the protrusions 33a are inserted into the corresponding insertion holes 31a, so that the first wall 331 can be fixed on the side walls to form the receiving cavity 30 a. The number of the insertion openings 31a and the protrusions 33a may be plural, which is advantageous for enhancing the stability of the structural connection. It should be understood that the number of sockets 31a and projections 33a shown in fig. 1-3 are shown for example only.

The plurality of battery cells 11 may be disposed in the casing 30 in a predetermined manner, for example, the plurality of battery cells 11 are divided into a plurality of columns, each column of battery cells 11 includes a plurality of groups, and each group includes the first battery cell 111 and the second battery cell 112. The casing 30 is provided with a partition 30b, and two adjacent columns of the battery cells 11 are separated by the partition 30 b. Optionally, the separator 30b includes an insulating member, the insulating member includes an insulating material, and the separator 30b may be used to separate the aluminum-plastic films of two adjacent columns of the battery cells 11, so as to improve electrochemical corrosion.

The first structural member 121 is disposed on the first wall 31 and extends along the third direction z to a position between the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112. In some scenarios, for example, referring to fig. 4, 5, and 8 to 10, the first structural member 121 includes a first portion 121a and a second portion 121b, and along the first direction x, the first portion 121a is disposed between the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112, and the second portion 121b is disposed between the first sealing portion 12c of the adjacent first cell 111 and the first sealing portion 12c of the second cell 112. Alternatively, the first structural member 121 includes two first portions 121a, and the second portion 121b is disposed between the two first portions 121 a. Optionally, the first portion 121a and the second portion 121b are plate-shaped insulators, which facilitate the entry of the first structural member 121 between the first cell 111 and the second cell 112 in a scenario of assembling the first wall 31 with the side wall.

In some embodiments, along the first direction x, an orthogonal projection of the third sealing portion 12e is at least partially located within an orthogonal projection of the first portion 121a, which facilitates the first portion 121a to separate the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112, thereby improving the separation effect and improving the electrochemical corrosion.

As shown in fig. 4 and 5, in the third direction z, the length of the portion of the first portion 121a disposed between the third sealing parts 12e is H1, the length of the portion of the second portion 121b disposed between the first sealing parts 12c is H2, and H1 < H2.

In a scenario in which the first wall 31 is assembled with the side wall along the third direction z, the second portion 121b first protrudes between the first sealing portions 12c of the adjacent first cell 111 and second cell 112 for achieving a preliminary positioning, thereby facilitating the entry of the first portion 121a between the third sealing portions 12e of the adjacent first cell 111 and second cell 112. Alternatively, along the first direction x, an orthogonal projection of a portion of the first portion 121a disposed between the third sealing parts 12e is located within an orthogonal projection of the first sealing part 12 c.

The length of the third sealing part 12e along the third direction z is H0, and the length H0 may be the length of the third sealing part 12e protruding from the end face of the accommodating part 12 a. Optionally, H1 ≧ 5% H0. In the scenario in which the first wall 31 is assembled with the side wall along the third direction z, the first portion 121a extends from the free end of the third sealing portion 12e, and the length between the first portion 121a and the third sealing portion 12e is greater than or equal to 5% of the height of the third sealing portion 12e, which may reduce the contact between adjacent third sealing portions 12e during manufacturing or transportation.

Referring to fig. 8, 9 and 10, in an embodiment, the first structural element 121 further includes a third portion 121c, and the third portion 121c is disposed between the first portion 121a and the second portion 121 b. The third portion 121c is provided with an inclined surface 121d on a side facing the battery cell 11, and the inclined surface 121d forms an acute angle with the second direction y. In the scenario in which the first wall 31 is assembled with the side wall along the third direction z, the inclined surface 121d facilitates guiding the first portion 121a into between the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112.

With continued reference to fig. 1 to fig. 5, the plurality of battery cells 11 further includes a third battery cell 113, and for two groups adjacent to each other along the first direction x, the third battery cell 113 is disposed adjacent to the second battery cell 112. The third seal 12e of the third cell 113 is disposed opposite the third seal 12e of the second cell 112, it being understood that the third cell 113 may also serve as the first cell 111 or the second cell 112 in a single grouping.

The first wall 31 may also be provided with a second structural member 122, the second structural member 122 comprising an insulating material. Along the first direction x, the second structural member 122 is disposed between the sealing portion junction 12f of the adjacent second cell 112 and the sealing portion junction 12f of the third cell 113, where the sealing portion junction 12f is the junction of the first sealing portion 12c and the third sealing portion 12 e. The second structure 122 may separate the aluminum-plastic films of the cell casing 12 in the second cell 112 and the third cell 113, which is beneficial for improving electrochemical corrosion. Optionally, the second structural member 122 is made of an insulating material, such as plastic. Optionally, the outer surface of the second structural member 122 is made of an insulating material.

In some scenarios, as shown in fig. 4, 5, and 8 to 10, the second structural member 122 includes a fourth portion 122a and a fifth portion 122b, and along the first direction x, the fourth portion 122a is disposed between the sealing portion joint 12f of the adjacent second cell 112 and the sealing portion joint 12f of the third cell 113, and the fifth portion 122b is disposed between the first sealing portion 12c of the adjacent second cell 112 and the first sealing portion 12c of the third cell 113. Alternatively, the fourth portion 122a and the fifth portion 122b may be plate-shaped insulating structures, respectively, which facilitate the second structure 122 to enter between the second cell 112 and the third cell 113 in the scenario of assembling the first wall 31 with the side wall.

In an embodiment, the orthographic projection of the sealing portion joint 12f is at least partially located in the orthographic projection of the fourth portion 122a, which is beneficial for the fourth portion 122a to separate the sealing portion joint 12f of the adjacent second cell 112 from the sealing portion joint 12f of the third cell 113, so that the separation effect is improved, and the electrochemical corrosion is improved.

In the third direction z, the length of the fourth portion 122a between the seal connections 12f is H21, the length of the fifth portion 122b between the first seals 12c is H22, and H21 < H22. In a scenario in which the first wall 31 is assembled with the side wall along the third direction z, the fifth portion 122b first extends between the first sealing portions 12c of the adjacent second cell 112 and the third cell 113, so as to achieve a preliminary positioning, thereby facilitating the fourth portion 122a to enter between the sealing portion junction 12f of the adjacent second cell 112 and the sealing portion junction 12f of the third cell 113.

Referring to fig. 8, 9 and 10, in an embodiment, the second structural member 122 further includes a sixth portion 122c, and the sixth portion 122c is disposed between the fourth portion 122a and the fifth portion 122 b. The sixth portion 122c is provided with an inclined surface 122d on a side facing the battery cell 11, and the inclined surface 122d forms an acute angle with the second direction y. In the scenario where the first wall 31 is assembled with the side wall along the third direction z, the inclined surface 122d is beneficial to guide the fourth portion 122a into between the seal connection 12f of the adjacent second cell 112 and the seal connection 12f of the third cell 113.

In one embodiment, the first structural member 121 and the second structural member 122 are substantially identical.

Referring to fig. 1 to 10, the first wall 31 may include a plurality of side plates 311, and the side plates 311 form an accommodating space, for example, four side plates 311 are connected end to form an accommodating space. The first structural member 121 and the second structural member 122 are disposed in the receiving space. The two first portions 121a of the first structural member 121 are respectively connected to the two side plates 311 disposed oppositely in the second direction y, which is beneficial for isolating the third sealing parts 12e of the adjacent first cell 111 and the second cell 112. The two fourth portions 122a of the second structural member 122 are respectively connected to the two side plates 311 disposed oppositely along the second direction y, which is beneficial to isolating the sealing portion connection 12f of the adjacent second battery cell 112 from the sealing portion connection 12f of the third battery cell 113.

In the first wall 31, the first structural member 121, the second structural member 122 and other parts of the first wall 31 may be integrally formed insulating plates, for example, by a low pressure injection molding process. Along the first direction x, the first structural member 121 and the second structural member 122 are sequentially arranged at intervals, a through hole 124 is formed between the adjacent first structural member 121 and the second structural member 122, and the tab 13 of the battery cell 11 passes through the through hole 124 and extends out of the casing 30. The through-holes 124 may facilitate rapid heat dissipation from the cells 11.

Referring to fig. 8, 9, 10 and 11, the first structural member 121 and the second structural member 122 may be provided with a plurality of protrusions 123, a side of the protrusion 123 facing the sealing portion 12b includes an inclined surface 123a, and an included angle α between the inclined surface 123a and the third direction z is an acute angle along the third direction z. In one embodiment, the protrusion 123 is disposed on the second portion 121, and the length of the protrusion 123 along the third direction z does not exceed the length H2 of the portion of the second portion 121b disposed between the first sealing portions 12c, so as to guide the tab 13 during the assembly process and facilitate the tab 13 to pass through the through hole 124.

It is understood that in other embodiments, one of the first structural member 121 and the second structural member 122 may be provided with the protrusion 123, and the other may not be provided with the protrusion 123.

Alternatively, the thickness of any one of the first structural member 121 and the second structural member 122 may decrease along the third direction z, for example, the thickness of the second portion 121b of the first structural member 121 decreases, and the thickness of the fifth portion 122b of the second structural member 122 decreases.

Second embodiment

For structural elements with the same name, the embodiments of the present application are identified by the same reference numerals. On the basis of the description of the preceding embodiments, but mainly different therefrom: referring to fig. 12 to 14, the first structure 121 is disposed on the first sidewall 331 and the second sidewall 332, and the first sidewall 331 and the second sidewall 332 are disposed opposite to each other along the second direction y. The first structural member 121 is disposed between the third sealing parts 12e of the adjacent first cell 111 and the third sealing parts 12e of the second cell 112 in the first direction x. Alternatively, the first structure member 121, the first sidewall 331 and the second sidewall 332 are integrally formed by an injection molding process.

The first structural member 121 may include an insulating plate and extend between the third sealing part 12e of the adjacent first cell 111 and the third sealing part 12e of the second cell 112 in the second direction y.

Optionally, the width of the first structural member 121 is gradually reduced along the third direction z, so as to facilitate guiding the first structural member 121 between the third sealing portions 12e of the adjacent first cell 111 and second cell 112.

In the present embodiment, the length of the first structural member 121 extending into the third sealing portion 12e between the adjacent first cell 111 and second cell 112 along the third direction z is H1. The height H1 of the first structural member 121 can still satisfy: h1 is more than or equal to 5% H0.

As shown in fig. 12 to 14, the plurality of battery cells 11 are arranged in a row in the casing 30, and the plurality of battery cells 11 include a plurality of groups, each of which includes a first battery cell 111 and a second battery cell 112. The second structural member 122 may be a side plate of the housing 30, which is disposed between two adjacent groups.

The present application further provides an electric device, which includes a load and the battery pack 1 of any of the above embodiments, wherein the battery pack 1 supplies power to the load.

The electric device may be implemented in various specific forms, for example, in a practical application scenario, the electric device includes but is not limited to: the system comprises a standby power supply, an unmanned aerial vehicle, a single wheel, an electric vehicle with two or more wheels, a motorcycle, a bicycle, a lighting device, a toy, an electric tool, an industrial and commercial energy storage system or a household energy storage system and the like.

Since the electric device has the battery pack 1 of any of the foregoing embodiments, the electric device can produce the advantageous effects of the battery pack 1 of the corresponding embodiment.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structural changes made by using the contents of the specification and the drawings are included in the scope of the present application.

Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element, and that elements, features, or elements having the same designation in different embodiments may or may not have the same meaning as that of the other elements, and that the particular meaning will be determined by its interpretation in the particular embodiment or by its context in further embodiments.

In addition, in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present application.

Although the terms "first, second, third, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Claims

1. A battery pack, comprising a plurality of cells stacked along a first direction, the cells comprising an electrode assembly, a cell case, and a battery connected to the electrode assembly and drawn out from the cell case A tab, the cell housing includes an accommodating portion for accommodating the electrode assembly and a sealing portion extending outward from the periphery of the accommodating portion, the sealing portion comprising a first sealing portion, a second sealing portion and a third sealing portion part, the tabs extend out of the battery case from the first sealing part; Extending from the second sealing part and connecting the first sealing part and the second sealing part, the second direction is perpendicular to the first direction,

It is characterized in that the plurality of cells include adjacent first cells and second cells, the tabs of the first and second cells are arranged on the same side of the battery pack, and the first cell and the second cell have tabs on the same side of the battery pack. The third sealing part of the battery cell is arranged towards the third sealing part of the second battery core, and the third sealing part of the second battery core is arranged towards the third sealing part of the first battery core;

The battery pack further includes a first structural member, the first structural member includes an insulating material, and along the first direction, the first structural member is provided on the third sealing portion of the first cell and the between the third sealing portion of the second cell.

2 . The battery pack according to claim 1 , wherein the battery pack further comprises a casing for accommodating the plurality of cells, the casing comprising a first wall, a second wall and a plurality of side walls. 3 . , the first wall and the second wall are oppositely arranged along a third direction, the third direction is perpendicular to the first direction, and the second direction is perpendicular to the plane where the first direction and the third direction are located , the first structural member is arranged on the first wall, and the first structural member extends along the second direction to the third sealing portion of the first cell and the third sealing portion of the second cell between.

3 . The battery pack according to claim 2 , wherein the first structural member comprises a first part and a second part, and along the first direction, the first part is provided on the side of the first cell. 4 . Between the third sealing part and the third sealing part of the second cell, the second part is provided between the first sealing part of the first cell and the first sealing part of the second cell.

4 . The battery pack of claim 3 , wherein, along the first direction, the orthographic projection of the third sealing portion is at least partially located within the orthographic projection of the first portion. 5 .

5 . The battery pack according to claim 3 , wherein, along the third direction, the length of the part of the first part disposed between the third sealing parts is H1 , and the second part disposed in the third The length of the part between a sealing part is H2, and H1<H2.

6 . The battery pack according to claim 5 , wherein, along the third direction, the length of the third sealing portion is H0 , and H1 ≥ 5%*H0 .

7 . The battery pack according to claim 5 , wherein the first structural member further comprises a third part, the third part connects the first part and the second part, and the third part faces the One side of the battery cell is provided with an inclined surface, and an acute angle is formed between the inclined surface and the second direction.

8 . The battery pack according to claim 3 , wherein the first wall comprises a plurality of side plates forming a receiving space, the first structural member is arranged in the receiving space, and the first part is connected to the receiving space. 9 . the side panel connection.

9. The battery pack according to any one of claims 2 to 8, wherein the plurality of cells further comprises a third cell disposed adjacent to the second cell, the third cell The third sealing part of the core is arranged away from the third sealing part of the second battery core;

The battery pack further includes a second structural member disposed on the first wall, and along the first direction, the second structural member is disposed at the connection between the sealing portion of the second cell and the third cell Between the connection points of the sealing parts, the connection point of the sealing part is the connection point of the first sealing part and the third sealing part.

10 . The battery pack according to claim 1 , wherein the battery pack further comprises a housing for accommodating the plurality of cells, the housing comprising a first side wall and a The second side wall, the first structural member is provided on at least one of the first side wall and the second side wall.

11 . The battery pack according to claim 9 , wherein a through hole is provided between the adjacent first structural members and the second structural member, and the tab passes through the through hole and extends to outside the first wall.

12 . The battery pack according to claim 9 , wherein the first structural member and the second structural member each comprise a convex portion, the convex portion comprises an inclined surface, and the inclined surface is related to the third direction. 13 . The included angle between them is an acute angle.

13. An electrical device, comprising a load and the battery pack according to any one of claims 1 to 12, wherein the battery pack supplies power to the load.