CN218334226U

CN218334226U - Single battery and battery pack

Info

Publication number: CN218334226U
Application number: CN202222549399.1U
Authority: CN
Inventors: 邓芳泽; 李一乐; 刘超; 袁长福; 宁大雕; 李进
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-01-17
Anticipated expiration: 2032-09-22

Abstract

The application provides a single battery and a battery pack, wherein the single battery comprises a shell and a pole piece; the pole piece is arranged in the shell and is surrounded by the shell; the length of the pole piece is adapted to the length of the shell; the shell comprises a first surface and a second surface which are oppositely arranged; the first surface is provided with a concave part; a pole column is arranged on the second surface opposite to the position of the sunken part of the first surface; wherein, the depressed part is configured to accommodate the pole of the adjacent unit cell when a plurality of unit cells are stacked. Through setting up single cell's utmost point post on single cell's second face to correspond at first face and set up the depressed part, first face and second face are the contact surface when a plurality of single cell pile up, and wherein the depressed part is used for holding utmost point post, and when a plurality of single cell pile up and form the battery package, outstanding utmost point post can not occupy battery package length, width and direction of height's space, thereby has improved the space utilization who puts in order the package.

Description

Single battery and battery pack

Technical Field

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

Background

In order to improve the space utilization rate of the battery pack, the current power batteries are developed towards the direction of lengthening the battery cell, for example, the blade battery and the short-blade battery, and one of the reasons is that the long-cell battery can play a role in enhancing the structural strength of the battery pack when being placed in the battery pack, so that the use of reinforcing ribs inside the battery pack is reduced.

When electric core is long, in order to improve the inside space utilization of electric core, current power battery chooses to do the terminal at the both ends of electric core left and right sides usually, and this kind of mode can improve the space utilization of battery to a certain extent, but the terminal still has occupied the width direction's of whole package space utilization not high.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a battery cell and a battery pack, so that the problem that in the prior art, terminals are arranged at two ends of the left side surface and the right side surface of an electric core, the terminals occupy the space of the whole pack in the width direction, and the space utilization rate of the whole pack is not high is solved.

According to the single battery provided by the embodiment of the application, the single battery comprises a shell and a pole piece; the single battery comprises a length direction and a thickness direction which extend along the horizontal direction, and a width direction which extends along the vertical direction; the length L of the single battery in the length direction, the width H in the width direction and the thickness D in the thickness direction satisfy L > H > D;

the pole piece is arranged in the shell and is surrounded by the shell; the length of the pole piece is adapted to the length of the shell;

the shell comprises a first surface and a second surface which are oppositely arranged;

the first surface is provided with a concave part;

a pole column is arranged on the second surface opposite to the position of the sunken part of the first surface;

wherein, the depressed part is configured to accommodate the utmost point post of adjacent battery cell when a plurality of battery cells stack.

Among the above-mentioned technical scheme, through setting up single cell's utmost point post on single cell's second face to correspond at first face and set up the depressed part, first face and second face are the contact surface when a plurality of single cell pile up, and wherein the depressed part is used for holding utmost point post, and when a plurality of single cell pile up and form the battery package, outstanding utmost point post can not occupy the space that battery package length, width and direction of height, thereby has improved the space utilization who puts the package.

In some optional embodiments, the recess depth of the recess is greater than the height of the post, and the bottom area of the recess is greater than the top area of the post.

Among the above-mentioned technical scheme, the sunken degree of depth of depressed part is greater than the height of utmost point post, and the bottom area of depressed part is greater than the top area of utmost point post, and the depressed part can hold outstanding utmost point post completely promptly for arbitrary two adjacent battery cells can laminate completely when a plurality of battery packages pile up, thereby have improved the space utilization of whole package.

In some alternative embodiments, the length and width of the first and second faces are L and H, respectively.

In some optional embodiments, both sides of the first surface in the length direction are respectively provided with a recessed part in the width direction, and two recessed parts on the second surface opposite to the first surface are both provided with a pole;

the two recessed portions are configured to accommodate two poles of an adjacent one of the unit cells when the plurality of unit cells are stacked.

Among the above-mentioned technical scheme, the battery cell just, the negative pole post all sets up on the second face, sets up the depressed part respectively for just, the position of negative pole post on first face, and when a plurality of battery cells piled up, two depressed parts of a battery cell's first face can hold just, the negative pole post on another battery cell's the second face, and a plurality of battery cells's range is compacter to improve the space utilization of whole package.

In some optional embodiments, the first surface is provided with a recess along the width direction along a first side of the length direction, and the first surface is provided with a pole along a second side of the length direction;

the positions of the recessed part and the pole column on the second surface, which are opposite to the first surface, are respectively provided with a pole column and a recessed part;

the two recessed parts are configured to accommodate the poles of two adjacent single batteries respectively when the plurality of single batteries are stacked;

the two poles are configured to be respectively surrounded by the recessed portions of two adjacent unit cells when the plurality of unit cells are stacked.

Among the above-mentioned technical scheme, the positive and negative pole post of battery cell all sets up respectively on first face one side and second face one side, sets up the depressed part at first face opposite side, sets up the depressed part at second face opposite side, when a plurality of battery cells pile up, the depressed part that two faces of a battery cell just, negative pole post can be surrounded by two adjacent battery cells in front and back respectively, a plurality of battery cell's range is compacter to improve the space utilization who wraps entirely.

In some alternative embodiments, the housing includes a side housing surrounding the lengthwise side of the pole piece, and two end portions respectively provided at both lengthwise ends of the housing; the end part comprises a concave part and a pole;

the side shell is provided with two opening parts at two ends of the shell respectively;

the two end portions cover the two opening portions, respectively.

Among the above-mentioned technical scheme, the side casing can be that aluminum plate of certain thickness is buckled, is tailor-welded and forms, forms two openings about, and arbitrary face does not have the flange on this side casing, can not occupy the battery package more spaces in the arbitrary direction. The two ends may be formed as a single plate by stamping to form a cavity for receiving the tabs of the ends of the pole pieces. In this embodiment, the four welding seams at the connection of the side shell and the end part are in the same plane, so that the side shell and the end part are easier to weld and connect.

In some alternative embodiments, the recessed portion and the pole are arranged on one side close to the end portion, and the other side of the end portion is provided with an explosion-proof valve and/or a liquid injection hole.

Among the above-mentioned technical scheme, tip one side is used for setting up depressed part and utmost point post to still hold the utmost point ear of pole piece in this side inside, the tip opposite side sets up explosion-proof valve and/or annotates the liquid hole, and is rationally distributed, make full use of the space of tip.

In some alternative embodiments, the end portion comprises a top cover and a profile having a cavity and a recess, the top cover and the profile being connected to form a cavity for receiving the end portion of the pole piece.

Among the above-mentioned technical scheme, the tip is formed by top cap and the welding of profile shapes, and the top cap is sheet structure, makes things convenient for top cap both sides and the casing edge of battery cell to weld.

In some alternative embodiments, the profile is produced by stamping a sheet material having a thickness of 0.5mm to 2.5mm.

In some optional embodiments, the post comprises a post bottom and a post communication portion; the end part also comprises a sealing ring, second plastic, first plastic and a conducting block; the sealing ring is sleeved on the pole communicating part;

one end of the pole post communicating part is connected with the bottom of the pole post, and the other end of the pole post communicating part sequentially penetrates through the second plastic, the top cover and the first plastic and then is connected to the conducting block; the bottom of the pole is connected with the pole ear of the pole piece.

Among the above-mentioned technical scheme, first plastic, second plastic and sealing washer play sealed and insulating effect to, first plastic still plays the spacing effect in the antipole post bottom, and the second plastic still plays the spacing effect to the piece that switches on.

The battery pack provided by the embodiment comprises at least one battery pack, wherein the battery pack comprises a plurality of single batteries which are overlapped with each other and are placed as any one of the above single batteries, and any two adjacent single batteries in the battery pack meet the following requirements: the first surface of one single battery is attached to the second surface of the other single battery.

Among the above-mentioned technical scheme, because battery cell's utmost point post sets up on battery cell's second face to correspond at first face and set up the depressed part, first face and second face are the contact surface when a plurality of battery cell pile up, and wherein the depressed part is used for holding utmost point post, consequently, when a plurality of battery cell pile up and form the battery package, outstanding utmost point post can not occupy the space of battery package length, width and direction of height, thereby has improved the space utilization who wraps entirely.

In some alternative embodiments, the method comprises: the length direction of the single batteries is parallel to the width direction of the battery pack.

Among the above-mentioned technical scheme, battery pack width direction is arranged along battery pack width direction to battery cell's length direction, and a plurality of battery cells form the group battery along battery pack length direction, are one deck group battery along battery pack direction of height in the battery pack, consequently, each battery cell homoenergetic enough plays the effect of strengthening battery pack width direction structural strength. At this time, the width of the battery pack is fixed, and the width of the battery pack is about a multiple of the length L of the single battery, but the length of the battery pack can be flexibly set, and the length of the battery pack is determined by the number of the single batteries in the battery pack and the thickness of each single battery.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a single battery provided in an embodiment of the present application;

fig. 2 is a split structure diagram of a single battery provided in an embodiment of the present application;

FIG. 3 is a schematic view of an end provided by an embodiment of the present application;

fig. 4 is a schematic structural diagram of a top cover provided in an embodiment of the present application;

fig. 5 is a flowchart illustrating steps of a method for manufacturing a single battery according to an embodiment of the present disclosure;

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

An icon: 1-cell, 11-housing, 111-side housing, 2-pole piece, 21-tab, 3-pole, 4-recess, 5-second face, 6-explosion-proof valve, 7-end, 71-top cover, 72-profile, 73-pole bottom, 74-first plastic, 75-second plastic, 76-conducting block, 77-sealing ring, 79-pole communication, 8-stringer, 9-first face.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a single battery 1 provided in an embodiment of the present application, where the single battery 1 includes a casing 11 and a pole piece 2; the unit battery 1 includes a length direction and a thickness direction extending in a horizontal direction, and a width direction extending in a vertical direction; the length L in the longitudinal direction, the width H in the width direction, and the thickness D in the thickness direction of the unit battery 1 satisfy L > H > D. Wherein the pole piece 2 (shown in fig. 2) is disposed in the housing 11 and surrounded by the housing 11; the length of the pole piece 2 is adapted to the length of the shell 11; the shell 11 comprises a first surface 9 and a second surface 5 which are oppositely arranged; the first surface 9 is provided with a recess 4; the second surface 5 is provided with a pole 3 at a position opposite to the recessed part 4 of the first surface 9; wherein the recessed portion 4 is configured to receive the terminal post 3 of an adjacent unit cell 1 when a plurality of unit cells 1 are stacked.

In the embodiment of the application, set up on the second face 5 of single cell 1 through utmost point post 3 with single cell 1 to correspond at first face 9 and set up depressed part 4, first face 9 and second face 5 are the contact surface when a plurality of single cell 1 pile up, wherein depressed part 4 is used for holding utmost point post 3, when a plurality of single cell 1 pile up and form the battery package, outstanding utmost point post 3 can not occupy the space of battery package length, width and direction of height, thereby has improved the space utilization who puts in order the package.

In some alternative embodiments, the recessed depth of the recessed portion 4 is greater than the height of the protrusion of the pole post 3, and the bottom area of the recessed portion 4 is greater than the top area of the pole post 3. In the embodiment of the application, the sunken degree of depth of depressed part 4 is greater than utmost point post 3's height, and the bottom area of depressed part 4 is greater than utmost point post 3's top area, and the depressed part 4 can hold outstanding utmost point post 3 completely promptly for arbitrary two adjacent battery cells 1 can laminate completely when a plurality of battery packages pile up, thereby has improved the space utilization of whole package.

The length and the width of the first surface 9 and the second surface 5 of the embodiment of the present application are L and H, respectively, that is, the first surface 9 and the second surface 5 are two surfaces with the largest area of the single battery 1. It should be clear that in some alternative embodiments, the first face 9 and the second face 5 may also be two other opposite faces, for example: the first face 9 and the second face 5 may be left and right side faces of the unit battery 1 as shown in fig. 1, and when a plurality of unit batteries 1 are stacked, the left side face of the unit battery 1 is fitted with the right side face of the adjacent unit battery 1; alternatively, the first and second faces 9 and 5 may be upper and lower bottom faces of the unit cell 1 as shown in fig. 1, and when a plurality of unit cells 1 are stacked, the upper top face of the unit cell 1 is attached to the lower bottom face of the adjacent unit cell 1. The following embodiments of the present application will be described taking the first surface 9 and the second surface 5 as two surfaces of the single cell 1 having the largest area as an example.

In some alternative embodiments, as shown in fig. 1, both sides of the first surface 9 in the length direction are respectively provided with a recess 4 in the width direction, and both recesses 4 of the second surface 5 opposite to the first surface 9 are provided with the pole 3; the two recessed portions 4 are configured to accommodate the two terminal posts 3 of an adjacent one of the unit batteries 1 when the plurality of unit batteries 1 are stacked.

In the embodiment of the present application, the positive and negative poles of the single battery 1 are all disposed on the second surface 5, the positions corresponding to the positive and negative poles on the first surface 9 are respectively provided with the concave portions 4, when the single batteries 1 are stacked, the two concave portions 4 of the first surface 9 of one single battery 1 can accommodate the positive and negative poles on the second surface 5 of the other single battery 1, the arrangement of the single batteries 1 is more compact, and therefore the space utilization rate of the whole pack is improved.

In some alternative embodiments, one concave portion 4 and one pole 3 are arranged on the first surface 9, that is, the first surface 9 is provided with the concave portion 4 along the width direction along a first side of the length direction, and the first surface 9 is provided with the pole 3 along a second side of the length direction; oppositely, the second surface 5 is also provided with a concave part 4 and a pole 3, the concave part 4 on the second surface 5 and the pole 3 on the first surface 9 are oppositely arranged, and the pole 3 on the second surface 5 and the concave part 4 on the first surface 9 are oppositely arranged. The two recessed portions 4 of the unit batteries 1 are configured to accommodate the poles 3 of two adjacent unit batteries 1, respectively, when a plurality of unit batteries 1 are stacked; the two terminals 3 of the unit cell 1 are arranged so as to be surrounded by the recessed portions 4 of the adjacent two unit cells 1, respectively, when a plurality of unit cells 1 are stacked.

In the embodiment of the application, the positive pole and the negative pole of the single battery 1 are respectively arranged on one side of a first surface 9 and one side of a second surface 5, the other side of the first surface 9 is provided with the concave part 4, the other side of the second surface is provided with the concave part 4, when a plurality of single batteries 1 are stacked, the positive pole and the negative pole of two surfaces of one single battery 1 can be respectively surrounded by the concave parts 4 of two adjacent single batteries 1 in the front and the back, the arrangement of the single batteries 1 is more compact, and therefore the space utilization rate of the whole package is improved.

Referring to fig. 2, fig. 2 is a split structure diagram of a single battery 1 provided in the embodiment of the present application. The shell 11 comprises a side shell 111 surrounding the side edge of the pole piece 2 along the length direction, and two end parts 7 respectively arranged at two ends of the shell 11 along the length direction; the end part 7 comprises a concave part 4 and a pole 3; the side case 111 has two openings formed at both ends of the case 11; the two end portions 7 cover the two openings, respectively.

In this application embodiment, side casing 111 can be that the aluminum plate of certain thickness is buckled, is tailor-welded and forms, forms two openings about forming to, arbitrary face does not have the flange on this side casing 111, can not occupy the battery package more spaces in the arbitrary direction. The two ends 7 may be formed as a single plate by stamping to form a cavity for receiving the tabs 21 of the ends 7 of the pole piece 2. In this embodiment, four welding seams are formed at the joint of the side casing 111 and the end portion 7 in the same plane, so that it is easier to weld the side casing 111 and the end portion 7 together.

Referring to fig. 3, fig. 3 is a schematic view of an end portion 7 according to an embodiment of the present application, wherein the recessed portion 4 and one side of the pole 3 close to the end portion 7 are provided, and the other side of the end portion 7 is provided with an explosion-proof valve 6 and/or a liquid injection hole. In the embodiment of the application, one side of the end part 7 is used for arranging the concave part 4 and the pole 3, the pole lug 21 of the pole piece 2 is also accommodated in the side, and the other side of the end part 7 is provided with the explosion-proof valve 6 and/or the liquid injection hole. Referring to fig. 3, the explosion-proof valve 6 is disposed on the left side of the end portion 7, the recessed portion 4 is disposed near the right side of the end portion 7, in this embodiment, the explosion-proof valve 6 and the recessed portion 4 are located on the same plane, in other embodiments, the liquid injection hole is disposed on the left side of the end portion 7, the liquid injection hole and the recessed portion 4 are located on the same plane, the explosion-proof valve 6 or the liquid injection hole is located on the left side of the end portion 7, and the explosion-proof valve 6 or the liquid injection hole is located on the upper surface of the end portion 7. Therefore, in the embodiments of the present application, the explosion-proof valve 6 and the injection liquid are disposed on the left side of the end portion 7, the recessed portion 4 and the pole 3 are disposed on the right side of the end portion 7, the layout is reasonable, and the space of the end portion 7 is fully utilized.

In some alternative embodiments, the end portion 7 comprises a top cover 71 and a profile 72, the profile 72 has a cavity and a recess 4, and the top cover 71 and the profile 72 are connected to form a cavity for receiving the end portion 7 of the pole piece 2. In the embodiment of the present application, the end portion 7 is formed by welding the top cover 71 and the special-shaped member 72, and the top cover 71 is a sheet structure, so that two sides of the top cover 71 can be conveniently welded to the edge of the housing 11 of the single battery 1.

In some alternative embodiments, the profile 72 is made by stamping a sheet of material having a thickness of 0.5mm to 2.5mm.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a top cover 71 according to an embodiment of the present disclosure.

In some alternative embodiments, the pole 3 comprises a pole bottom 73 and a pole communication portion 79; the end part 7 further comprises a sealing ring 77, a second plastic 75, a first plastic 74 and a conducting block 76; the seal ring 77 is fitted over the post communicating portion 79;

one end of the pole post communicating part 79 is connected with the pole post bottom 73, and the other end of the pole post communicating part 79 sequentially penetrates through the second plastic 75, the top cover 71 and the first plastic 74 and then is connected to the conducting block 76; the pole bottom 73 is connected to the tab 21 of the pole piece 2.

In this embodiment, the first plastic 74, the second plastic 75 and the sealing ring 77 have sealing and insulating effects, the first plastic 74 further has a function of limiting the bottom 73 of the electrode column, and the second plastic 75 further has a function of limiting the conducting block 76. The post communicating portion 79 is riveted to the conduction block 76, and the recessed portion 4 is configured to accommodate the conduction block 76 in this embodiment. Referring to fig. 5, fig. 5 is a flowchart illustrating steps of a method for manufacturing the single battery 1 according to an embodiment of the present disclosure, which specifically includes:

step 100, enabling an electrode core assembly consisting of the pole piece 2 and the pole lugs 21 to penetrate into the side shell 111 from an opening part of the side shell 111;

step 200, respectively welding the two top covers 71 to two ends of the side shell 111 along the length direction;

step 300, welding the tab 21 of the electrode core assembly with the electrode post 3 on the top cover 71;

and 400, welding and firmly sealing the places where the profiled part 72, the top cover 71 and the side shell 111 are contacted with each other in pairs respectively.

The battery pack provided by the embodiment comprises at least one battery pack, wherein the battery pack comprises a plurality of single batteries 1 which are overlapped with each other, and any two adjacent single batteries 1 in the battery pack meet the following requirements: the first surface 9 of one cell 1 is attached to the second surface 5 of another cell 1.

In the embodiment of the application, because utmost point post 3 of single cell 1 sets up on single cell 1's second face 5 to correspond at first face 9 and set up depressed part 4, first face 9 and second face 5 are the contact surface when a plurality of single cell 1 pile up, wherein depressed part 4 is used for holding utmost point post 3, consequently, when a plurality of single cell 1 pile up and form the battery package, outstanding utmost point post 3 can not occupy the space of battery package length, width and direction of height, thereby has improved the space utilization who wraps entirely.

In some optional embodiments, please refer to fig. 6, and fig. 6 is a schematic structural diagram of a battery pack provided in an embodiment of the present application, in which a length direction of a single battery 1 in the battery pack is parallel to a width direction (H1 direction in the drawing) of the battery pack. In the embodiment of the application, the length direction of battery cell 1 arranges along battery package width direction, and a plurality of battery cells 1 form the group battery along battery package length direction, is the one deck group battery along battery package direction of height in the battery package, consequently, each battery cell 1 homoenergetic enough plays the effect of strengthening battery package width direction structural strength. At this time, the width of the battery pack is fixed, and the width of the battery pack is about a multiple of the length L of the single battery 1, but the length of the battery pack can be flexibly set, and the length of the battery pack is determined by the number of the single batteries 1 in the battery pack and the thickness of each single battery 1.

The battery pack of the present embodiment further has a longitudinal beam 8; the battery pack is arranged on each of two sides of the longitudinal beam 8, and the longitudinal beam 8 is parallel to the two edge beams. It should be clear that the longitudinal beam 8 can also be a plurality of longitudinal beams 8, the longitudinal beam 8 plays a role in reinforcing the structural strength of the battery pack in the length direction, and the strength of the battery pack in the length direction and the strength of the battery pack in the width direction are both ensured because the single battery 1 plays a role in reinforcing the structural strength of the battery pack in the width direction.

In some optional embodiments, the longitudinal beams 8 may not be provided in the battery pack while the length direction of the single batteries 1 in the battery pack is parallel to the width direction of the battery pack, and at this time, the battery pack has only one battery pack because the longitudinal beams 8 are not provided in the battery pack, that is, one battery pack is formed by all the single batteries 1 in the battery pack, and the space utilization rate of the battery pack is higher at this time.

In some optional embodiments, the single batteries 1 in the battery pack may also be arranged according to the following rules: the length direction of the single batteries 1 is arranged along the length direction of the battery pack (as shown in the L1 direction of FIG. 6), a plurality of single batteries 1 form a battery pack along the width direction of the battery pack, and a layer of battery pack is arranged in the battery pack along the height direction of the battery pack.

In the embodiment of the present application, the arrangement of the single batteries 1 in the battery pack is as follows: the length direction of battery cell 1 arranges along battery package length direction, and a plurality of battery cell 1 form the group battery along battery package width direction, and it is the one deck group battery to follow battery package direction of height in the battery package, and battery cell 1 can play the effect of strengthening battery package length direction structural strength to because battery cell 1 has played the effect of strengthening battery package length direction structural strength, battery package length direction and width direction's intensity has all obtained the assurance. When the arrangement mode of the embodiment is adopted, the length of the battery pack is relatively fixed, and the length of the battery pack is about a multiple of the length of the single batteries 1, however, the width of the battery pack can be flexibly set, and the width of the battery pack is determined by the number of the single batteries 1 in the battery pack and the thickness among the single batteries 1.

In some alternative embodiments, the length direction of the single batteries 1 is arranged along the length direction of the battery pack, and the battery pack is internally provided with a beam along the width direction of the battery pack, and two sides of the beam are respectively provided with one battery pack.

It should be clear that the crossbeam here can be many crossbeams, and the crossbeam plays the effect of strengthening battery package width direction structural strength to because battery cell 1 has played the effect of strengthening battery package length direction structural strength, battery package length direction and width direction's intensity has all obtained the assurance.

In some optional embodiments, while the length direction of the single batteries 1 is arranged along the length direction of the battery pack, the battery pack does not have a cross beam, and at this time, the battery pack has only one battery pack due to no cross beam inside, that is, all the single batteries 1 in the battery pack form one battery pack, and at this time, the space utilization rate of the battery pack is higher.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The single battery is characterized by comprising a shell and a pole piece; the single battery comprises a length direction and a thickness direction which extend along the horizontal direction, and a width direction which extends along the vertical direction; a length L of the unit cell in the longitudinal direction, a width H in the width direction, and a thickness D in the thickness direction satisfy L > H > D,

the first surface is provided with a concave part;

wherein the recessed portion is configured to accommodate a pole of an adjacent unit cell when a plurality of the unit cells are stacked.

2. The battery cell of claim 1, wherein the recessed portion has a recessed depth greater than a height of the terminal post, and a bottom area greater than a top area of the terminal post.

3. The cell of claim 1, wherein the first and second faces have lengths and widths L and H, respectively.

4. The single battery according to claim 3, wherein the first surface is provided with recesses in the width direction on both sides in the length direction, and the second surface is provided with a terminal on both recesses opposite to the first surface;

5. The single battery according to claim 3, wherein a first side of the first surface in the length direction is provided with a recess in the width direction, and a second side of the first surface in the length direction is provided with a pole;

the second surface is provided with a pole column and a recessed part respectively corresponding to the recessed part and the pole column of the first surface;

the two sunken parts are configured to accommodate the pole posts of two adjacent single batteries respectively when the single batteries are stacked;

the two electrode posts are configured to be respectively surrounded by the concave parts of two adjacent single batteries when the single batteries are stacked.

6. The battery cell according to claim 4, wherein the case includes a side case that surrounds the lengthwise sides of the pole piece, and two end portions that are provided at both lengthwise ends of the case, respectively; the end part comprises the concave part and a pole;

the two end portions cover the two opening portions, respectively.

7. The single battery according to claim 6, wherein the recessed portion and the terminal post are provided on one side close to the end portion, and an explosion-proof valve and/or a liquid injection hole are/is provided on the other side of the end portion.

8. The cell defined in claim 6, wherein the end portion comprises a top cover and a profile having a cavity and a recess, the top cover and the profile being joined to form the cavity for receiving the end portion of the pole piece.

9. The cell of claim 8, wherein the profile is prepared by stamping a sheet material having a thickness of 0.5mm to 2.5mm.

10. The cell of claim 8, wherein the post comprises a post bottom and a post communication portion; the end part also comprises a sealing ring, a second plastic, a first plastic and a conducting block; the sealing ring is sleeved on the pole communicating part;

one end of the pole post communicating part is connected with the bottom of the pole post, and the other end of the pole post communicating part sequentially penetrates through the second plastic, the top cover and the first plastic and then is connected to the conducting block; the bottom of the pole is connected with the pole lug of the pole piece.

11. A battery pack, comprising at least one battery pack, wherein the battery pack comprises a plurality of single batteries according to any one of claims 1 to 10, which are arranged on top of each other, and any two adjacent single batteries in the battery pack satisfy the following conditions: the first surface of one single battery is attached to the second surface of the other single battery.