CN216750016U

CN216750016U - Battery with a battery cell

Info

Publication number: CN216750016U
Application number: CN202220136822.2U
Authority: CN
Inventors: 魏文飞; 郭富荣; 张文轩; 吴莉平; 谭忠; 宋江涛
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-06-14
Anticipated expiration: 2032-01-18

Abstract

The embodiment of the application belongs to the technical field of batteries, and particularly relates to a battery, which aims to solve the technical problem that the thickness of the battery is large due to the fact that a first battery cell and a second battery cell which are stacked are connected in series. The battery provided by the embodiment of the application comprises a first battery cell, a second battery cell, a shell with a cavity and an isolation layer; the first cavity and the second cavity that independent are cut apart into with the cavity in the casing to the isolation layer, and first electric core is located first cavity, and the second electric core is located the second cavity, first electric core with the second electric core is and sets up side by side to through electric connector on the isolation layer connection first output and second output, first electric core and second electric core set up side by side in the coplanar, the thickness of battery only is the thickness of an electric core, piles up the setting with first electric core and second electric core among the correlation technique and compare, has reduced the thickness of battery.

Description

Battery with a battery cell

Technical Field

The embodiment of the application belongs to the technical field of batteries, and particularly relates to a battery.

Background

The battery takes a carbon material as a negative electrode, takes a lithium-containing compound as a positive electrode, and lithium ions are inserted and extracted between the positive electrode and the negative electrode in a reciprocating manner under the action of an electrolyte so as to realize the charging and discharging of the battery. The battery has the advantages of environmental protection, long service life and the like, so the battery is widely applied to various industries such as computers, electric vehicles and the like.

In the related art, in order to improve the output voltage of the battery, the battery includes a first battery cell, an isolation layer and a second battery cell are sequentially stacked on the first battery cell, and then the first battery cell and the second battery cell are connected in series to improve the output voltage of the battery.

However, in the battery in the related art, the first cell and the second cell, which are arranged in a stacked manner, result in a large thickness of the battery.

SUMMERY OF THE UTILITY MODEL

The main purpose of the embodiment of the present application is to provide a battery, and aims to solve the technical problem that the thickness of the battery is large due to the fact that a first battery cell and a second battery cell are stacked.

To achieve the above object, an embodiment of the present application provides a battery, including: the battery comprises a first battery cell, a second battery cell, a shell with a cavity and an isolation layer;

the isolating layer is arranged in the shell and divides a cavity in the shell into a first cavity and a second cavity which are independent, the first battery cell is positioned in the first cavity, the second battery cell is positioned in the second cavity, and the first battery cell and the second battery cell are arranged side by side;

the first cell includes a first output;

the second cell includes a second output having a different polarity than the first output;

the isolation layer includes an electrical connector through which the first output portion and the second output portion are connected.

On the basis of the technical scheme, the embodiment of the application can be further improved as follows:

in some embodiments, which may include the above embodiments, the isolation layer includes a first groove and a second groove, the first cell is disposed in the first groove, and the second cell is disposed in the second groove.

In some embodiments, which may include the above embodiments, the groove bottom of the first groove is located on a first side of the isolation layer, the groove bottom of the second groove is located on a second side of the isolation layer, and the first side and the second side are oppositely disposed.

In some embodiments, which may include the above embodiments, the isolation layer includes an insulating layer, the electrical connector is received within the insulating layer;

the insulating layer forms the first groove and the second groove;

the electric connector comprises a first connecting part exposed in the first groove, a second connecting part exposed in the second groove and a main body part connecting the first connecting part and the second connecting part;

the first output part of the first battery cell is electrically connected with the first connecting part;

the second output portion of the second battery cell is electrically connected to the second connection portion.

In some embodiments, which may include the above embodiments, the insulating layer includes a first insulating layer and a second insulating layer;

the first insulating layer comprises a first base part and a first extending part extending from the first base part;

the second insulating layer comprises a second base part and a second extending part extending from the second base part;

the electric connector comprises a conductive layer, and the first extension part, the conductive layer and the second extension part are arranged in a stacking mode to jointly form a first groove and a second groove;

the projection of the end part of the conducting layer close to the first local part in the thickness direction of the isolation layer is positioned outside the projection of the end part of the second insulation layer in the thickness direction of the isolation layer;

the projection of the end part of the conductive layer close to the second base part in the thickness direction of the isolation layer is positioned outside the projection of the end part of the first insulation layer in the thickness direction of the isolation layer.

In some embodiments, which may include the above-mentioned embodiments, a projection of the first extension in the thickness direction of the isolation layer, corresponding to a groove wall of the first groove close to the second groove, at least partially overlaps a projection of the second extension in the thickness direction of the isolation layer, corresponding to a groove wall of the second groove close to the first groove.

In some embodiments, which may include the above embodiments, a projection of the first connection portion on the groove bottom of the first groove covers a portion of the groove bottom of the first groove; and/or the projection of the second connecting part on the groove bottom of the second groove covers part of the groove bottom of the second groove.

In some embodiments, which may include the above-described embodiments, the first cell includes a first pole piece and a second pole piece, the first pole piece includes a first current collector and a third output disposed on the first current collector, the third output includes a portion that extends outside the casing;

the second battery cell comprises a third pole piece and a fourth pole piece, the third pole piece comprises a third current collector and a fourth output part arranged on the third current collector, and the fourth output part comprises a part extending out of the shell.

In some embodiments, which may include the above embodiments, the second pole piece includes a second current collector, the second current collector includes a first tail portion located at the winding tail end of the first cell, and the first tail portion is the first output portion, and/or

The fourth pole piece includes the fourth mass flow body, the fourth mass flow body is including being located the second afterbody of the rolling tail end of second electricity core, the second afterbody is the second output.

In some embodiments, which may include the above embodiments, the first and second pole pieces are sequentially wound one on top of the other;

the second pole piece comprises a plurality of first pole lugs arranged along the length direction of the second pole piece, the first pole lugs are overlapped and aligned, and the first pole lugs are the first output parts;

and/or

The third pole piece and the fourth pole piece are sequentially overlapped and wound;

the third pole piece comprises a plurality of second pole lugs arranged along the length direction of the third pole piece, the second pole lugs are overlapped and aligned, and the second pole lugs are the second output part.

The battery provided by the embodiment of the application comprises a first battery cell, a second battery cell, a shell with a cavity and an isolation layer; the first cavity and the second cavity that independent are cut apart into with the cavity in the casing to the isolation layer, and first electric core is located first cavity, and the second electric core is located the second cavity, first electric core with the second electric core is and sets up side by side to through electric connector on the isolation layer connection first output and second output, first electric core and second electric core set up side by side in the coplanar, the thickness of battery only is the thickness of an electric core, piles up the setting with first electric core and second electric core among the correlation technique and compare, has reduced the thickness of battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is an exploded view of a battery provided in an embodiment of the present application;

fig. 2 is a cross-sectional view of a battery provided in an embodiment of the present application;

fig. 3 is a top view of a battery provided in an embodiment of the present application;

fig. 4 is a schematic structural view of a separator layer of a battery provided in an embodiment of the present application;

fig. 5 is a cross-sectional view of a separator layer of a battery provided by an example of the present application;

fig. 6 is a side cross-sectional view of a separator layer of a battery provided in an example of the present application in an unfolded state;

fig. 7a is a first schematic diagram illustrating a position of a first connection portion in a battery according to an embodiment of the present disclosure;

fig. 7b is a second schematic diagram illustrating a position of a first connection portion in a battery according to an embodiment of the present disclosure;

fig. 7c is a third schematic diagram illustrating a position of a first connection portion in a battery according to an embodiment of the present disclosure;

fig. 8a is a first schematic structural diagram of a first positive plate and a first negative plate that constitute a first battery cell in a battery provided in an embodiment of the present application;

fig. 8b is a first schematic structural diagram of a first battery cell in a battery provided in an embodiment of the present application;

fig. 9a is a second schematic structural diagram of a first positive plate and a first negative plate that constitute a first battery cell in a battery according to an embodiment of the present application;

fig. 9b is a schematic structural diagram of a first battery cell in the battery provided in the embodiment of the present application;

fig. 10a is a third schematic structural diagram of a first positive plate and a first negative plate that constitute a first battery cell in a battery provided in an embodiment of the present application;

fig. 10b is a schematic structural diagram of a first battery cell in the battery provided in the embodiment of the present application;

fig. 11a is a first schematic structural diagram of a second positive plate and a second negative plate constituting a second cell in a battery provided in an embodiment of the present application;

fig. 11b is a first schematic structural diagram of a second cell in the battery provided in the embodiment of the present application;

fig. 12a is a second schematic structural diagram of a second positive plate and a second negative plate that constitute a second cell in the battery provided in the embodiment of the present application;

fig. 12b is a structural schematic diagram of a second battery cell in the battery provided in the embodiment of the present application;

fig. 13a is a third schematic structural diagram of a second positive plate and a second negative plate that constitute a second cell in the battery provided in the embodiment of the present application;

fig. 13b is a third schematic structural diagram of a second battery cell in the battery provided in the embodiment of the present application.

Description of reference numerals:

10-a first cell; 110-a first positive plate;

111-a first positive tab; 120-a first negative plate;

121-first negative tab; 130-a first tail;

140-positive electrode material; 150-negative electrode material;

20-a second cell; 210-a second positive plate;

211-a second tab; 220-a second negative plate;

221-a second negative tab; 230-a second tail;

30-an isolation layer; 310-a first insulating layer;

311-a first base; 312 — a first extension;

320-a second insulating layer; 321-a second base;

322-a second extension; 330-a conductive layer;

331-a first connection; 332-a second connection;

333-first welding point; 334-second welding points;

340-a first groove; 350-a second groove;

40-a first housing;

50-the second housing.

Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

For improving the output voltage of the battery, the battery cells of the battery can be connected in series, however, the battery after being packaged by a single battery cell is connected in series, and the battery after being connected in series is too large in size due to the fact that the battery comprises a plurality of shells, so that in the related art, the adopted battery comprises a first battery cell, a second battery cell and an isolation layer, the isolation layer and the second battery cell are sequentially stacked on the first battery cell, and then the first battery cell and the second battery cell are connected in series to improve the output voltage of the battery.

However, in the battery in the related art, the first battery cell and the second battery cell that are stacked are connected in series, and the thickness of the battery is the sum of the thicknesses of the two battery cells, which results in a larger thickness of the battery, in some application scenarios, for example, in the application of a notebook computer, the notebook computer generally adopts an ultra-thin design as a technical bright point, and the battery in the stack series connection cannot meet the scenario, so it is important to reduce the thickness of the battery in the first battery cell and the second battery cell in series connection.

In view of this, the battery provided in the embodiment of the application includes a first battery cell, a second battery cell, a casing having a cavity, and an isolation layer, where the isolation layer divides the casing into a first cavity and a second cavity, the first cavity and the second cavity are arranged side by side, the first battery cell is located in the first cavity, the second battery cell is located in the second cavity, and the first battery cell and the second battery cell are arranged side by side, so that the thickness of the battery is only the thickness of one battery cell, and thus the thickness of the battery is reduced.

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the protection scope of the present application.

As shown in fig. 1, a battery provided in the embodiment of the present application includes a first battery cell 10, a second battery cell 20, a casing having a cavity, and an isolation layer;

as shown in fig. 1, the battery provided in the embodiment of the present application includes a first battery cell 10, a second battery cell 20, and a casing and an isolation layer 30 having a cavity;

as shown in fig. 9a-9b, where the first battery cell 10 includes a first pole piece and a second pole piece, for example, the first pole piece is a first positive pole piece 110, the second pole piece is a first positive pole piece 110, and of course, the first pole piece may also be a first negative pole piece 120, and the second pole piece is a first positive pole piece 110, as long as it is ensured that the polarities of the first pole piece and the second pole piece are different. For convenience of describing the embodiments of the present application, the following description will be made by taking the first electrode sheet as the first positive electrode sheet 110 and the second electrode sheet as the second positive electrode sheet 210 as an example.

The first positive plate 110 comprises a positive current collector, a positive material 140 is coated on the positive current collector, a first positive tab 111 is further arranged on the positive current collector, and the first positive tab 111 is a positive interface connected with an external circuit; the first negative plate 120 includes a negative current collector, the negative current collector is coated with a negative material 150, the negative current collector is further provided with a first negative tab 121, and the first negative tab 121 is a negative electrode interface connected with an external circuit.

The positive electrode current collector is used for bearing the active positive electrode material 140, the negative electrode current collector is used for bearing the active negative electrode material 150, and meanwhile, the positive electrode current collector and the negative electrode current collector can collect electrons generated by electrochemical reaction and conduct the electrons to an external circuit; the positive current collector may be made of aluminum foil, and the negative current collector may be made of copper foil.

The positive electrode material 140 provides a lithium ion source for the battery, the positive electrode material 140 is a lithium ion compound, and the positive electrode material 140 may be, for example, lithium cobaltate, a ternary material, or lithium iron phosphate; the negative electrode material 150 is a main material constituting a negative electrode reaction, and the negative electrode material 150 may be graphite, mesocarbon microbeads, a silicon-based material, or the like.

As shown in fig. 9a and 9b, a separator layer is disposed between the first positive electrode sheet 110 and the first negative electrode sheet 120, and the first positive electrode sheet 110, the first negative electrode sheet 120, and the separator layer are simultaneously wound to form the first battery cell 10.

When the lithium ion battery works, electrolyte is filled between the first positive plate 110 and the first negative plate 120, when the battery is charged, namely the battery is connected with an external power supply through the first positive tab 111 and the first negative tab 121, the positive material 140 on the first positive plate 110 is ionized into lithium ions and electrons in the electrolyte, the potential of the positive electrode is high, the electrons flow from the positive current collector to the negative current collector through an external circuit, the lithium ions are dissociated in the electrolyte and enter the negative electrode through the diaphragm layer, the lithium ions can be embedded into the porous negative material 150, and the higher the embedded lithium ions are, the higher the charging capacity is; when the battery discharges, the potential of the negative electrode is high, lithium ions embedded in the negative electrode material 150 are extracted from the negative electrode material 150 and return to the positive electrode through the diaphragm layer, meanwhile, electrons also return to the positive electrode through an external circuit, and the directional movement of the electrons forms current to supply power for the external circuit.

In this embodiment, as shown in fig. 11a to 13b, the second electrical core 20 includes a third pole piece and a fourth pole piece, the polarity of the third pole piece is opposite to that of the fourth pole piece, and for convenience of describing the embodiments in the present application, the following description will all use the third pole piece as the second positive pole piece 210 and the fourth pole piece as the second negative pole piece 220 as an example.

The second positive tab 211 is disposed on the second positive tab 210, the second negative tab 220 is disposed on the second negative tab 221, and the structure and the operation principle of the second battery cell 20 are the same as those of the first battery cell 10, which is not described herein again.

As shown in fig. 1 and fig. 2, in the embodiment of the present application, the first battery cell 10 and the second battery cell 20 may be battery cells having the same structure and size; of course, in other embodiments, the first battery cell 10 and the second battery cell 20 may also be battery cells with different shapes and sizes, which are not limited in the embodiment of the present application.

In this embodiment, as shown in fig. 1 to fig. 3, the casing is configured to encapsulate the first battery cell 10 and the second battery cell 20, so as to implement assembly and protection of the first battery cell 10 and the second battery cell 20, where the casing may be an aluminum-plastic film, and exemplarily, the casing may include a PP layer, and an aluminum layer and a nylon layer that are sequentially disposed on the PP layer.

As shown in fig. 2, an isolation layer 30 is disposed in the casing, the isolation layer 30 divides the casing into two independent first cavities and two independent second cavities, the first battery cell 10 is disposed in the first cavity, and the second battery cell 20 is disposed in the second cavity, wherein the first cavity and the second cavity are sealed to prevent the electrolyte in the first cavity or the second cavity from leaking.

The material of the isolation layer 30 includes an insulating material, and the material of the isolation layer 30 is, for example, polyethylene terephthalate or polyurethane, but may be other polyester-based organic materials.

In some embodiments, the thickness of the isolation layer 30 may be 30 μm to 400 μm, and exemplary thicknesses are 30 μm, 100 μm, and 400 μm, but in order to further reduce the thickness of the battery, the thickness of the isolation layer 30 may also be 30 μm to 80 μm, and exemplary thicknesses are 30 μm, 50 μm, and 80 μm.

In this embodiment, as shown in fig. 1 and fig. 2, the first cavity and the second cavity are arranged side by side, that is, the first battery cell 10 and the second battery cell 20 are arranged side by side, which means that the first winding core and the second winding core are tiled in one layer, rather than stacked one on top of the other.

The first cell 10 includes a first output; the second battery cell 20 includes a second output portion with a polarity different from that of the first output portion, for example, the first output portion may be a first negative tab 121, the second output portion may be a second positive tab 211, and of course, the first output portion and the second output portion may also be other manners capable of outputting current, for example, the first output portion and the second output portion may be a positive current collector or a negative current collector, which is not limited in this embodiment.

As shown in fig. 2, the isolation layer 30 further includes an electrical connector, and the first output and the second output are connected by the electrical connector to realize the series connection of the first battery cell 10 and the second battery cell 20.

During installation, the first battery cell 10 is disposed in the first cavity, the second battery cell 20 is disposed in the second cavity, the first battery cell 10 and the second battery cell 20 are disposed side by side, and the first output portion of the first battery cell 10 is connected to the second output portion of the second battery cell 20 through an electrical connector.

The battery provided by the embodiment of the application, including first electric core 10, second electric core 20, casing and isolation layer 30 that have the cavity, isolation layer 30 is cut apart into independent first cavity and second cavity with the cavity in the casing, first electric core 10 is located first cavity, second electric core 20 is located the second cavity, first electric core 10 and second electric core 20 are and set up side by side, and connect first output and second output through the electric connector on the isolation layer 30, first electric core 10 and second electric core 20 set up side by side in the coplanar, the thickness of battery is only the thickness of a battery core, pile up the setting with first electric core 10 and second electric core 20 among the correlation technique and compare, the thickness of battery has been reduced.

As shown in fig. 1, 2, and 4, in some embodiments, the separation layer 30 includes a first groove 340 and a second groove, the first cell 10 is disposed in the first groove 340, the second cell 20 is disposed in the second groove, the first groove 340 enables the first cell 10 to be stably installed in the first cavity, and the second groove enables the second cell 20 to be stably installed in the second cavity.

As shown in fig. 2 and fig. 3, the depth direction of the first groove 340 and the depth direction of the second groove are perpendicular to the isolation layer 30, that is, the first groove 340 and the second groove are arranged side by side, so as to cooperate with the side by side arrangement of the first battery cell 10 and the second battery cell 20, and further reduce the thickness of the battery.

In some embodiments, the isolation layer 30 includes a first side and a second side opposite to each other, and the groove bottom of the first groove 340 and the groove bottom of the second groove 350 may be located on the first side at the same time, or located on the second side at the same time, that is, the notch of the first groove 340 and the notch of the second groove 350 are arranged in the same direction.

In other embodiments, as shown in fig. 1, 2, and 4, the groove bottom of the first groove 340 is located on the first side of the isolation layer 30, the groove bottom of the second groove 350 is located on the second side of the isolation layer 30, and the first side and the second side are opposite, that is, as shown in fig. 2, in the embodiment, the notch of the first groove 340 and the notch of the second groove 350 are opposite, and the connection between the first groove 340 and the second groove 350 only needs one layer of isolation layer 30. In the embodiment that the notches of the first groove 340 and the second groove 350 are arranged in the same direction, the joint of the first groove 340 and the second groove 350 needs to bend the isolation layer 30 by 180 degrees, that is, the common groove wall of the first groove 340 and the second groove 350 is composed of two layers of isolation layers 30, so that in the embodiment, the forming mode of the first groove 340 and the second groove 350 is simpler, and the common groove wall is composed of one layer of isolation layer 30, the distance of the battery along the tiling direction can be reduced, and the volume of the battery is further reduced.

In some embodiments, as shown in fig. 2, the groove depth of the first groove 340 is greater than or equal to half of the thickness of the first battery cell 10, and the groove depth of the second groove 350 is greater than or equal to half of the depth of the second battery cell 20, so that a phenomenon that wrinkles are generated around the first groove 340 and the second groove 350 due to the thinner thickness of the isolation layer 30 when the first battery cell 10 is placed in the first groove 340 and the second battery cell 20 is placed in the second groove 350 is avoided.

It should be noted that the first groove 340 and the second groove 350 may be formed by stamping, specifically, the first groove 340 is formed on the first side of the isolation layer 30 by stamping using a first stamping die, and the second groove 350 is formed on the second side of the isolation layer 30 by stamping using a second stamping die; of course, other modes such as molding can also be adopted, and the embodiment of the application is not limited.

In some embodiments, the isolation layer 30 includes an insulating layer with the electrical connector received therein; the insulating layer forms a first groove 340 and a second groove; the electric connector comprises a first connecting part 331 exposed in the first groove 340, a second connecting part 332 exposed in the second groove, and a main body part connecting the first connecting part 331 and the second connecting part 332; the first output portion of the first cell 10 is electrically connected to the first connection portion 331; in this embodiment, the second output portion of the second battery cell 20 is electrically connected to the second connection portion 332, and only the exposed first connection portion 331 is connected to the first battery cell 10, and the second connection portion 332 is connected to the second battery cell 20, that is, the first battery cell 10 is connected to the second battery cell 20 in series, and the insulating layer isolates the electrical connection member from the outside, thereby avoiding the possibility that the portions other than the first connection portion 331 and the second connection portion 332 contact the first battery cell 10 and the second battery cell 20, further improving the safety of the battery, and simultaneously saving the installation space of the electrical connection member, and further reducing the volume of the battery.

In some embodiments, as shown in fig. 5 and 6, the insulating layer includes a first insulating layer 310 and a second insulating layer 320.

In some embodiments, the thicknesses of the first insulating layer 310 and the second insulating layer 320 may be the same or different, and the first insulating layer 310 is 10 μm to 100 μm, and the second insulating layer 320 is 10 μm to 100 μm, for example, the thickness of the first insulating layer 310 may be 10 μm, 50 μm, and 100 μm, and the thickness of the second insulating layer 320 may be 10 μm, 80 μm, and 100 μm.

The thicknesses of the first insulating layer 310 and the second insulating layer 320 may also be 20 μm to 50 μm, and for example, the thicknesses of the first insulating layer 310 may be 20 μm, 30 μm, and 50 μm, and the thicknesses of the second insulating layer 320 may be 20 μm, 30 μm, and 50 μm, so that the insulating effects of the first insulating layer 310 and the second insulating layer 320 may be effectively ensured, and the thickness of the battery may be further reduced.

As shown in fig. 2 and 5, the first insulating layer 310 includes a first base 321, a first base 311, and a first extending portion 312 extending from the first base 311 of the first base 321; the second insulating layer 320 includes a second base 321 and a second extension 322 extending from the second base 321.

With continued reference to fig. 2 and 5, the electrical connector includes a conductive layer 330, and the first extension 312, the conductive layer 330, and the second extension 322 are stacked to form a first groove 340 and a second groove together, and the first groove 340 and the second groove share a sidewall formed by the first extension 312, the conductive layer 330, and the second extension 322.

The conductive layer 330 can realize electrical connection between the first battery cell 10 and the second battery cell 20, and the conductive layer 330 may be nickel or titanium, but may also be other metals.

The thickness of the conductive layer 330 is 10 μm to 200 μm, and illustratively, the thickness of the conductive layer 330 may be 10 μm, 150 μm, 200 μm; to further reduce the thickness of the battery, the thickness of the conductive layer 330 may be 10 μm to 100 μm, and exemplarily, the thickness may be 10 μm, 20 μm, 100 μm.

It should be noted that the length of the conductive layer 330 needs to be ensured to be electrically connected to the first battery cell 10 and the second battery cell 20 at the same time, in some embodiments, the length of the conductive layer 330 is 3mm to 60mm, and exemplarily, the length is 3mm, 30mm, or 60 mm; in order to further reduce the consumption of material, the length of the conductive layer 330 may also be 6mm to 20mm, and exemplarily, the length may be 6mm, 10mm, or 20 mm.

The projection of the end of the conductive layer 330 close to the first base 321 and the first base 311 in the thickness direction of the isolation layer 30 is located outside the projection of the end of the second insulation layer 320 in the thickness direction of the isolation layer 30, that is, in the first groove 340, the conductive layer 330 is partially exposed outside the second insulation layer 320, and the exposed part is the first connection portion 331.

The projection of the end of the conductive layer 330 close to the second base 321 in the thickness direction of the isolation layer 30 is located outside the projection of the end of the first insulation layer 310 in the thickness direction of the isolation layer 30, that is, in the second groove, the conductive layer 330 is partially exposed outside the first insulation layer 310, and the exposed portion is the second connection portion 332.

In this embodiment, the conductive layer 330 is disposed between the first insulating layer 310 and the second insulating layer 320, and forms a first groove 340 and a second groove together with the first extending portion 312 and the second extending portion 322, in the first groove 340, a part of the conductive layer 330 is exposed on the second insulating layer 320, in the second groove, a part of the conductive layer 330 is exposed outside the first insulating layer 310, and is connected to the first electrical core 10 only through the exposed first connecting portion 331, and the second connecting portion 332 is connected to the second electrical core 20, so that the first electrical core 10 and the second electrical core 20 can be connected in series;

the first insulating layer 310 and the second insulating layer 320 isolate the conductive layer 330 from the outside, thereby avoiding the possibility that the parts except the first connecting part 331 and the second connecting part 332 contact the first battery cell 10 and the second battery cell 20, further improving the safety of the battery, and the conductive layer 330 is of a laminated structure, thereby saving the installation space of the electric connector and further reducing the volume of the battery.

In some embodiments, a projection of the first extension 312, corresponding to a groove wall of the first groove 340 close to the second groove, in the thickness direction of the isolation layer 30 is at least partially overlapped with a projection of the second extension 322, corresponding to a groove wall of the second groove close to the first groove 340, in the thickness direction of the isolation layer 30, so that the first groove 340 and the second groove share one side wall, the processing difficulty of the first groove 340 and the second groove is reduced, and meanwhile, the length of the battery is further reduced.

In some embodiments, as shown in fig. 7 a-7 c, the projection of the first connection 331 on the bottom of the first recess 340 covers a portion of the bottom of the first recess 340; the projection of the second connecting portion 332 on the bottom of the second groove 350 covers a part of the bottom of the second groove 350, and the above arrangement improves the effectiveness of the insulating layer in isolating the first battery cell 10 from the second battery cell 20, and further avoids the misconnection between the conductive layer 330 and the first battery cell 10 and the second battery cell 20; at the same time, the amount of material used for the conductive layer 330 is also reduced.

It should be noted that, as shown in fig. 7a to 7c, the width of the first connection portion 331 may be the same as or different from that of the conductive layer 330; similarly, the width of the second connection portion 332 may be the same as or different from the width of the conductive layer 330.

In some embodiments, with continued reference to fig. 7a to 7c, the widths of the first connection portion 331 and the second connection portion 332 are 3mm to 15mm, and exemplarily 3mm, 10mm, and 15mm, although for convenience of electrical connection between the first cell 10 and the first connection portion 331, the second cell 20 and the second connection portion 332, the widths of the first connection portion 331 and the second connection portion 332 may also be 5mm to 8mm, and exemplarily 5mm, 6mm, and 8 mm.

It should be noted that, with continued reference to fig. 7a to fig. 7c, a direction in which the isolation layer 30 extends along the tiling direction of the first cell 10 and the second cell 20 is a length direction, a direction in which the isolation layer 30 extends perpendicular to the tiling direction of the first cell 10 and the second cell 20 is a width direction, and the width direction of the isolation layer 30 is also the width direction of the first insulation layer 310 and the second insulation layer 320.

As shown in fig. 7a, the first connection portion 331 may be located at the center of the first insulating layer 310 in the width direction; as shown in fig. 7b, the first connection portion 331 may be located at an upper end portion of the first insulating layer 310 in the width direction; as shown in fig. 7c, the first connection portion 331 may also be located at a lower end portion of the first insulating layer 310 in the width direction; the second connection portion 332 may be located at the center of the second insulating layer 320 in the width direction, and the second connection portion 332 may also be located at the upper end portion or the lower end portion of the second insulating layer 320 in the width direction.

In some embodiments, with continued reference to fig. 2 and 5, the first connection portion 331 is flush with the bottom of the first groove 340, and the second connection portion 332 is flush with the bottom of the second groove 350, so that the bottoms of the first groove 340 and the second groove 350 are flat, and the parallelism of the surface of the first electrical core 10 with respect to the surface of the second electrical core 20 is further improved, so as to facilitate subsequent packaging, and further reduce the thickness of the isolation layer 30.

In some embodiments, as shown in fig. 8a-10b, the first cell 10 includes a first pole piece and a second pole piece, the first pole piece includes a first current collector and a third output disposed on the first current collector, the third output includes a portion that extends outside the housing; still taking the first electrode tab as the first positive electrode tab 110 and the second electrode tab as the first negative electrode tab 120 as an example, the first current collector is a first positive current collector, the third output portion may be a first positive electrode tab 111, and the first positive electrode tab 111 is used for connecting to an external circuit.

As shown in fig. 11a-13b, the second cell 20 includes a third pole piece and a fourth pole piece, the fourth pole piece includes a fourth current collector and a fourth output portion disposed on the fourth current collector, and the fourth output portion includes a portion extending outside the casing; taking the third electrode tab as the second positive electrode tab 210 and the fourth electrode tab as the second negative electrode tab 220 as an example, the fourth current collector is a second negative current collector, the fourth output portion may be a second negative electrode tab 221, and the second negative electrode tab 221 is used for connecting to an external circuit.

As shown in fig. 3, in the present embodiment, the first positive tab 111 and the second negative tab 221 extend out of the casing, so as to facilitate connection with an external circuit.

In some embodiments, as shown in fig. 8a and 8b, the second electrode plate includes a second current collector, the second current collector includes a first tail portion 130 located at the winding tail end of the first electrical core 10, the first tail portion 130 is a first output portion, where the first tail portion 130 is an end portion of the current collector that is not coated with the positive electrode material 140 or the negative electrode material 150, that is, the first tail portion 130 may be a bare current collector, such as an aluminum foil or a copper foil, and this arrangement may save an installation space of the electrode tab, thereby reducing a volume of the battery.

As shown in fig. 11a and 11b, the third electrode includes a third current collector, the third current collector includes a second tail portion 230 located at the winding tail end of the second battery cell 20, the second tail portion 230 is the second output portion, where the second tail portion 230 is an end portion of the current collector that is not coated with the positive electrode material 140 or the negative electrode material 150, that is, the second tail portion 230 may be a bare current collector, for example, may be an aluminum foil or a copper foil, and this arrangement may save an installation space of the tab, and further reduce the volume of the battery.

In this embodiment, the first output portion of the first battery cell 10 may be a first tail portion 130, and the second output portion of the second battery cell 20 may be a second tail portion 230; of course, the first output portion of the first battery cell 10 may be the first tail portion 130 or the second output portion of the second battery cell 20 may be the second tail portion 230.

As shown in fig. 8a, when the second pole piece including the first tail portion 130 is the first negative pole piece 120, the other pole piece of the first electrical core 10 is the first positive pole piece 110, the length of the first negative pole piece 120 is longer than that of the first positive pole piece 110, and the extended part is an exposed copper foil, so that, as shown in fig. 8b, when the first positive pole piece 110 and the first negative pole piece 120 are wound, the copper foil extended from the negative pole piece is finally used as a winding tail end, that is, the first tail portion 130, and at this time, the first tail portion 130 is a negative pole.

As shown in fig. 11a, when the third pole piece including the second tail portion 230 is the second positive pole piece 210, the other pole piece of the second battery cell 20 is the second negative pole piece 220, the length of the second positive pole piece 210 is longer than that of the second negative pole piece 220, and the extended portion is a bare aluminum foil, so that, as shown in fig. 8b, when the second positive pole piece 210210 and the second negative pole piece 220 are wound, the aluminum foil extended from the positive pole piece is finally used as a winding tail end, that is, the second tail portion 230 is a positive pole.

In this embodiment, the first battery cell 10 is disposed in the first groove 340, the first tail portion 130 of the first battery cell 10 is electrically connected to the first connecting portion 331 of the conductive layer 330, and/or the second battery cell 20 is disposed in the second groove, and the second tail portion 230 of the second battery cell 20 is electrically connected to the second output portion, so as to implement the series connection of the first winding core and the second winding core.

As shown in fig. 3, the first tail portion 130 and the first connection portion 331 can be electrically connected by welding, that is, a plurality of first welding points 333 are disposed between the first connection portion 331 and the first tail portion 130 to realize reliable connection between the first tail portion 130 and the first connection portion 331; similarly, a plurality of second welding points 334 are disposed between the second connecting portion 332 and the second tail portion 230 to achieve a reliable connection between the second tail portion 230 and the second connecting portion 332.

In other embodiments, as shown in fig. 9a and 9b, the first pole piece and the second pole piece are sequentially wound in an overlapping manner; the second pole piece includes a plurality of first utmost point ears that set up along the length direction of second pole piece, and a plurality of first utmost point ears superpose and align, and a plurality of first utmost point ears are first output, and in this embodiment, through the multiple spot connection between first electric core 10 and the electric connector, the reliability of connecting has been strengthened, and simultaneously, a plurality of first utmost point ears set up can dispersed current, and a plurality of first utmost point ears are in parallel state for the total resistance of a plurality of first utmost point ears diminishes, and then has reduced the heat that produces on first electric core 10.

As shown in fig. 12a and 12b, the third pole piece (the second positive pole piece 210) and the fourth pole piece (the second negative pole piece 220) are sequentially wound in an overlapping manner; the third pole piece (the second positive pole piece 210) comprises a plurality of second pole lugs (second positive pole lugs 211) arranged along the length direction of the third pole piece, the second pole lugs (the second positive pole lugs 211) are overlapped and aligned, and the second pole lugs are the second output part, in the embodiment, the second battery cell 20 is connected with the electric connecting piece through multiple points, the connection reliability is enhanced, meanwhile, the second pole lugs can disperse current, and the second pole lugs are in a parallel state, so that the total resistance of the second pole lugs is reduced, and heat generated on the second battery cell 20 is further reduced.

In this embodiment, the second pole piece may be provided with a plurality of tabs, and the third pole piece may be provided with a plurality of second tabs, or the second pole piece may be provided with a plurality of tabs or the third pole piece may be provided with a plurality of second tabs.

In this embodiment, as shown in fig. 3, the first battery cell 10 is disposed in the first groove 340, the second winding core is disposed in the second groove, the plurality of first tabs are connected together and then connected to the first connecting portion 331, and/or the plurality of second tabs are connected together and then connected to the second connecting portion 332, so as to implement series connection of the first winding core and the second winding core.

Similarly, as shown in fig. 10a, a plurality of first positive electrode tabs 111 may be disposed at intervals on one side of the first positive electrode sheet 110, and finally, the first battery cell 10 is rolled, as shown in fig. 10 b; as shown in fig. 13a, a plurality of second negative electrode tabs 221 may be disposed at intervals on one side of second negative electrode sheet 220, and finally, a rolled second battery cell 20 is shown in fig. 13 b.

In other embodiments, the first output is a plurality or one of the first tabs and the second output is the second tail 230, or the first output is the first tail 130 and the second output is a plurality or one of the tabs.

In some embodiments, as shown in fig. 2, the casing includes a first casing 40 and a second casing 50, a first accommodating groove is formed in one side of the first casing 40, the first battery cell 10 and the second battery cell 20 are both accommodated in the first accommodating groove, and the second casing 50 covers the first casing 40 and closes the first accommodating groove.

In other embodiments, as shown in fig. 2, the casing includes a first casing 40 and a second casing 50, a first receiving groove is disposed on one side of the first casing 40, a second receiving groove is disposed on one side of the second casing 50, the second casing 50 covers the first casing 40, and the first receiving groove and the second receiving groove are enclosed to form receiving grooves for receiving the first battery cell 10 and the second battery cell, so as to facilitate packaging of the first battery cell 10 or the second battery cell 20 with a relatively large thickness (e.g., greater than 6 mm).

Of course, in the embodiment of the present application, the number of battery cells of the battery is not limited to two, and the battery may further include a third battery cell, a fourth battery cell, a fifth battery cell, and the like, where a setting position and a connection relationship between two adjacent battery cells are the same as those of the first battery cell 10 and the second battery cell 20 in the above implementation, and details are not repeated here.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A battery, comprising: the battery comprises a first battery cell, a second battery cell, a shell with a cavity and an isolation layer;

the first cell comprises a first output;

2. The battery of claim 1, wherein the isolation layer comprises a first recess and a second recess, the first cell disposed within the first recess, and the second cell disposed within the second recess.

3. The battery of claim 2, wherein the groove bottom of the first groove is located on a first side of the separator layer and the groove bottom of the second groove is located on a second side of the separator layer, the first side and the second side being oppositely disposed.

4. The battery according to claim 2,

the isolation layer comprises an insulation layer, and the electric connector is accommodated in the insulation layer;

the insulating layer forms the first groove and the second groove;

5. The battery according to claim 4,

the insulating layer comprises a first insulating layer and a second insulating layer;

the electric connector comprises a conductive layer, and the first extension part, the conductive layer and the second extension part are arranged in a stacked mode to form a first groove and a second groove together;

the projection of the end part of the conducting layer close to the first base part in the thickness direction of the isolation layer is positioned outside the projection of the end part of the second insulating layer in the thickness direction of the isolation layer;

6. The battery according to claim 5,

the projection of the first extending part corresponding to the groove wall of the first groove close to the second groove in the thickness direction of the isolation layer is at least partially overlapped with the projection of the second extending part corresponding to the groove wall of the second groove close to the first groove in the thickness direction of the isolation layer.

7. The battery of claim 6, wherein a projection of the first connection portion on the floor of the first recess covers a portion of the floor of the first recess;

and/or the presence of a gas in the atmosphere,

the projection of the second connecting part on the groove bottom of the second groove covers part of the groove bottom of the second groove.

8. The battery according to claim 1,

the first battery cell comprises a first pole piece and a second pole piece, the first pole piece comprises a first current collector and a third output part arranged on the first current collector, and the third output part comprises a part extending out of the shell;

the second battery cell comprises a third pole piece and a fourth pole piece, the fourth pole piece comprises a fourth current collector and a fourth output part arranged on the fourth current collector, and the fourth output part comprises a part extending out of the shell.

9. The battery according to claim 8,

the second pole piece comprises a second current collector, the second current collector comprises a first tail part positioned at the rolling tail end of the first battery cell, the first tail part is the first output part,

and/or

The third electrode comprises a third current collector, the third current collector comprises a second tail part located at the rolling tail end of the second battery core, and the second tail part is the second output part.

10. The battery according to claim 8,

the first pole piece and the second pole piece are sequentially overlapped and wound;

and/or