WO2024045738A1

WO2024045738A1 - Battery and battery manufacturing method

Info

Publication number: WO2024045738A1
Application number: PCT/CN2023/098250
Authority: WO
Inventors: 盛东辉; 彭宁
Original assignee: 珠海冠宇电池股份有限公司
Priority date: 2022-09-01
Filing date: 2023-06-05
Publication date: 2024-03-07
Also published as: CN115332611A

Abstract

The present application provides a battery and a battery manufacturing method. The battery comprises: a battery cell group, the battery cell group comprising a first battery cell, a second battery cell, a first adapter piece, and a second adapter piece, wherein the first battery cell comprises a first battery cell body, a first soft tab, and a second soft tab, the second battery cell comprises a second battery cell body, a third soft tab, and a fourth soft tab, the second battery cell body and the first battery cell body are stacked, the first adapter piece is conductively connected to the first soft tab and the third soft tab, and the second adapter piece is conductively connected to the second soft tab and the fourth soft tab; a first main tab, a first end of the first main tab being conductively connected to the first adapter piece; a second main tab, a first end of the second main tab being conductively connected to the second adapter piece; and an aluminum plastic film, the aluminum plastic film being used for sealing the battery cell group, and a second end of the first main tab and a second end of the second main tab extending out of the aluminum plastic film. The present application solves the problem that the capacity of a battery is limited because it is difficult to directly weld and fix multiple layers of soft tabs.

Description

Batteries and methods of preparing batteries

Technical field

The present application relates to the technical field of lithium-ion batteries, and in particular to a battery and a method for preparing the battery.

Background of the invention

With the continuous development of power batteries, people have put forward higher requirements for the capacity, volume energy density and welding process of power batteries. In order to increase the capacity of a power battery, multiple cells are usually stacked on top of each other, and their soft tabs are welded and fixed, and then lead out of the battery through the main tabs.

The soft tabs of the battery core have a certain thickness. Due to the limitations of the welding process, the maximum thickness of the soft tabs that can be directly welded and fixed is limited. When multiple cells are stacked for core-joining processing, the multi-layer soft tabs are difficult to be directly welded and fixed, resulting in limited capacity of the battery, which in turn results in poor endurance of the power battery.

Contents of the invention

Embodiments of the present application provide a battery and a battery preparation method to solve the problem of limited battery capacity due to the difficulty in directly welding and fixing multi-layer soft tabs.

The embodiment of the present application provides a battery, including:

Battery core group, the battery core group includes a first battery core, a second battery core, a first adapter piece and a second adapter piece, the first battery core includes a first battery core body, a first soft tab and a second soft pole tab; the second battery core includes a second battery core body, a third soft pole tab, and a fourth soft pole tab, and the second battery core body is stacked with the first battery core body; The first adapter piece is conductively connected to the first soft pole tab and the third soft pole tab; the second adapter piece is electrically conductive to the second soft pole tab and the fourth soft pole tab. connect;

A first main tab, the first end of the first main tab is conductively connected to the first adapter piece;

a second main pole, the first end of the second main pole is conductively connected to the second adapter piece;

Aluminum-plastic film, the aluminum-plastic film is used to seal the battery core group, and the second end of the first main tab and the second end of the second main tab extend outside the aluminum-plastic film.

Optionally, the first end and the second end of the first main tab are arranged at an included angle, and the first end and the second end of the second main tab are arranged at an included angle.

Optionally, the first adapter piece includes a first side and a second side arranged oppositely, and the first side of the first adapter piece is arranged toward the first cell body and the second cell body. , and is conductively connected to the first soft tab and the third soft tab, and the second side of the first adapter piece is conductively connected to the first main tab;

The second adapter piece includes a first side and a second side arranged oppositely, and a third side of the second adapter piece One side is disposed toward the first battery core body and the second battery core body and is conductively connected to the second soft pole tab and the fourth soft pole tab. The second side of the second adapter piece is connected to the second soft pole tab. The second main tab is conductively connected.

Optionally, the first adapter piece is arranged in close contact with the first soft pole tab and the third soft pole tab, and the second adapter piece is arranged with the second soft pole tab and the third soft pole tab. Four soft tab fit settings.

Optionally, the first soft pole tab and the second soft pole tab are arranged to fit the first battery core body, and the third soft pole tab and the fourth soft pole tab fit to the first battery core body. Two battery core body settings.

Optionally, the first adapter piece includes a first connection area and a second connection area arranged at intervals, the first connection area is used for conductive connection with the first soft tab, and the second connection area For conductive connection with the third soft tab;

The second adapter piece includes a third connection area and a fourth connection area arranged at intervals, the third connection area is used for conductive connection with the second soft tab, and the fourth connection area is used with the The fourth soft tab is electrically connected.

Optionally, a first through hole is provided between the first connection area and the second connection area; a second through hole is provided between the third connection area and the fourth connection area.

Optionally, the first main tab includes a first metal sheet and a first insulating glue, and the first metal sheet is pasted with the first insulating glue; the second main tab includes a second metal sheet. and a second insulating glue, the second insulating glue is attached to the second metal sheet.

Optionally, the battery core group further includes a first sticker and a second sticker. The first sticker is affixed to the side of the first adapter sheet away from the first battery core body. The second sticker It is attached to the side of the second adapter piece away from the first cell body.

Optionally, the first adapter piece is welded and fixed to the first soft tab and the third soft tab and formed with a first soldering area, and the second adapter piece is connected to the second The soft tab and the fourth soft tab are welded and fixed, and a second soldering area is formed.

Optionally, the battery core set further includes a first sticker and a second sticker. The first sticker is affixed to the side of the first adapter sheet away from the first battery core body and covers the first sticker. In the soldering area, the second sticker is attached to the side of the second adapter sheet away from the first cell body and covers the second soldering area.

Optionally, the first battery core includes a plurality of first sub-battery cores, and each first sub-battery core among the plurality of first sub-battery cores includes a first sub-battery core body, a first sub-soft pole ears and second sub-soft tabs, a plurality of first sub-cell bodies are stacked to form the first battery body, and the first sub-soft tabs of a plurality of first sub-cells are stacked and welded Forming the first soft tab, a plurality of second sub-soft tabs of the first sub-cells are stacked and welded to form the second soft tab;

The second battery core includes a plurality of second sub-battery cores, and each second sub-battery core in the plurality of second sub-battery cores includes a second sub-battery core body, a third sub-soft tab and a fourth A plurality of second sub-battery core bodies are stacked to form the second battery core body, and a plurality of third sub-soft tabs of the second sub-battery core are stacked and welded to form the third sub-soft tab. Three soft pole tabs, a plurality of fourth sub-soft tabs of the first sub-cell are arranged in a stack and The fourth soft tab is formed by welding.

In the embodiment of the present application, aluminum-plastic film is used in the battery pack. Since the thickness of the aluminum-plastic film is small, it can effectively reduce the thickness of the battery, thereby increasing the volumetric energy density of the battery. At the same time, the aluminum-plastic film is light in weight. , which can further improve the energy density of the battery. The battery core group includes a first battery core, a second battery core, a first adapter piece and a second adapter piece. Through the arrangement of the first main tab and the second main tab, the first battery core and the second battery core The soft tabs are welded to the main tabs through corresponding connecting pieces without direct welding. The soft tabs of multiple battery cells that require core-joining processing can be core-joined by welding to the main tabs separately, which provides more possibilities for increasing the capacity of the battery core, thereby improving the endurance of the power battery.

Brief description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting any creative effort.

Figure 1 is one of the structural schematic diagrams of a battery pack provided by an embodiment of the present application.

Figure 2 is the second structural schematic diagram of the battery pack provided by the embodiment of the present application.

Figure 3 is a schematic structural diagram of the first main tab provided by an embodiment of the present application.

FIG. 4 is one of the structural schematic diagrams of the first adapter plate provided by the embodiment of the present application.

FIG. 5 is the second structural schematic diagram of the first adapter plate provided by the embodiment of the present application.

Figure 6 is the third structural schematic diagram of the battery pack provided by the embodiment of the present application.

FIG. 7 is one of the structural schematic diagrams of the first battery cell provided by the embodiment of the present application.

Figure 8a is the second structural schematic diagram of the first battery cell provided by the embodiment of the present application.

Figure 8b is a side view of the first battery cell provided in Figure 8a.

Figure 9 is a schematic flow chart of a battery preparation method provided by an embodiment of the present application.

Figure 10 is a schematic diagram of the pre-soldering operation of the adapter piece.

Figure 11 is a schematic diagram of the core closing operation.

Figure 12 is a schematic diagram of the battery pack packaging operation.

How to implement this application

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

Unless otherwise defined, the technical terms or scientific terms used in this application shall be those in the field to which this application belongs. The usual meaning as understood by a person with average skill in the field. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Up", "down", "left", "right", etc. are only used to express relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly.

As shown in Figures 1 to 12, embodiments of the present application provide a battery, including:

Battery core group, the battery core group includes a first battery core 101, a second battery core 102, a first adapter sheet 103 and a second adapter sheet 104; the first battery core 101 includes a first battery core body 1011 , first soft pole tab 1012 and second soft pole tab 1013; the second battery core 102 includes a second battery core body 1021, a third soft pole tab 1022 and a fourth soft pole tab 1023. The second battery core The body 1021 is stacked with the first cell body 1011; the first adapter piece 103 is conductively connected to the first soft tab 1012 and the third soft tab 1022; the second adapter piece 104 is electrically connected to the second soft pole tab 1013 and the fourth soft pole tab 1023;

The first main tab 20, the first end of the first main tab 20 is conductively connected to the first adapter piece 103;

second main tab 30, the first end of the second main tab 30 is conductively connected to the second adapter piece 104;

Aluminum plastic film 40, the aluminum plastic film 40 is used to seal the battery core group, the second end of the first main tab 20 and the second end of the second main tab 30 extend from the aluminum Plastic film 40 outside.

Please refer to Figure 1. For the convenience of understanding, in subsequent embodiments, the length direction of the battery can be understood as the direction shown by the x-axis in the three-dimensional coordinate system as shown in Figure 1, and the width direction of the battery can be understood as the direction shown in Figure 1. represents the direction shown by the y-axis in the three-dimensional coordinate system. The height direction of the battery can be understood as the direction shown by the z-axis in the three-dimensional coordinate system as shown in Figure 1. The height direction, length direction and width direction of the first cell body 1011 and the second cell body 1021 are the same as the height direction, length direction and width direction of the battery.

It should be noted that the structures of the first battery core 101 and the second battery core 102 are not limited here. The structures of the first battery core 101 and the second battery core 102 may be the same or different. For example, in some embodiments, the first battery cell 101 and/or the second battery core 102 are laminated battery cells. In other embodiments, the first battery core 101 and/or the second battery core 102 are wound battery cores.

For convenience of description, in the following embodiments, both the first battery core 101 and the second battery core 102 are wound battery cores.

In some embodiments, the first separator, the first positive electrode sheet and the first negative electrode sheet are rolled to form the first cell body 1011, the first soft tab 1012 can be welded and fixed with the first positive electrode sheet, and the second soft tab 1013 It can be welded and fixed with the first negative electrode piece.

It should be understood that this application does not specifically limit the connection method between the first soft pole tab and the first positive electrode piece and the connection method between the second soft pole tab and the first negative electrode piece. For example, in other embodiments, the first separator , the first positive electrode sheet and the first negative electrode sheet are wound to form the first battery core 101, in which part of the first positive electrode sheet is cut to form first soft pole tabs 1012, and part of the first negative electrode sheet is cut to form second soft pole tabs 1013. , the remaining part can be understood as the first battery cell body 1011. That is to say, the first soft pole tab can be integrally formed with the first positive electrode sheet, and the second soft pole tab can be integrally formed with the first negative electrode sheet.

As shown in Figures 1 and 2, during specific implementation, the rolled at least one layer of first positive electrode sheets can be cut to form soft tabs extending along the height direction of the first cell body 1011. Therefore, the first soft tab The tab 1012 may be a single-layer soft tab or formed by welding multiple layers of soft tabs. In the same way, at least one layer of the rolled first negative electrode sheet can be cut and extended to extend the soft tab, so the second soft tab 1013 can be a single-layer soft tab or formed by welding of multiple layers of soft tabs.

In some embodiments, the second separator, the second positive electrode sheet and the second negative electrode sheet are rolled to form the second cell body 1021, the third soft tab 1022 can be welded and fixed with the second positive electrode sheet, and the fourth soft tab 1023 It can be welded and fixed with the second negative electrode piece.

It should be understood that this application does not specifically limit the connection method between the third soft pole tab and the second positive electrode piece and the connection method between the fourth soft pole tab and the second negative electrode piece. For example, in other embodiments, the second separator , the second positive electrode sheet and the second negative electrode sheet are wound to form the second battery core 102, in which part of the second positive electrode sheet is cut to form third soft pole tabs 1022, and part of the second negative electrode sheet is cut to form fourth soft pole tabs 1023. , the remaining part can be understood as the second battery cell body 1021. That is to say, the third soft pole tab can be integrally formed with the second positive electrode sheet, and the fourth soft pole tab can be integrally formed with the second negative electrode sheet.

In specific implementation, the rolled at least one layer of second positive electrode sheet can be cut and formed into soft tabs extending along the height direction of the second cell body 1021. Therefore, the third soft tab 1022 can be a single-layer soft tab. The lugs may be formed by welding multiple layers of soft lugs. In the same way, the rolled at least one layer of second negative electrode sheet can be cut and extended to extend the soft tab. Therefore, the fourth soft tab 1023 can be a single-layer soft tab or formed by welding of multiple layers of soft tabs.

As shown in FIGS. 1 and 2 , the stacked arrangement of the second cell body 1021 and the first cell body 1011 can be understood as the stacked arrangement of the second cell body 1021 and the first cell body 1011 along the width direction, so that the second cell body 1021 and the first cell body 1011 are stacked in the width direction. One soft pole tab 1012 and the third soft pole tab 1022 are arranged correspondingly along the width direction, and the second soft pole tab 1013 and the fourth soft pole tab 1023 are arranged correspondingly along the width direction.

The specific manner in which the first adapter piece 103 is conductively connected to the first soft tab 1012 and the third soft tab 1022 is not limited here. In specific implementation, the first adapter piece 103 and the first soft tab 1012 and the third soft tab 1022 are conductively welded. The specific manner in which the second adapter piece 104 is conductively connected to the second soft pole tab 1013 and the fourth soft pole tab 1023 is not limited here. During specific implementation, the second adapter piece 104 and the second soft pole tab 1013 and the fourth soft tab 1023 are conductive welding.

The second end of the first main pole tab 20 and the second end of the second main pole tab 30 extend outside the aluminum plastic film 40. The second end of the first main pole tab 20 and the second end of the second main pole tab 30 It can be used as an exposed part and be conductively connected to other components when the battery is actually used. Therefore, after the battery pack is packaged, the portions of the first main tab and the second main tab located outside the aluminum-plastic film 40 can also be understood as the tabs of the battery.

It should be understood that the thickness range of the aluminum-plastic film 40 is not limited here. For example, in some embodiments, the thickness of the aluminum plastic film 40 ranges from 153 μm to 300 μm.

In the embodiment of the present application, the aluminum-plastic film 40 is used in the battery pack. Since the thickness of the aluminum-plastic film 40 is small, it can effectively reduce the thickness of the battery, thereby increasing the volumetric energy density of the battery; at the same time, because the aluminum-plastic film 40 The lighter weight further increases the energy density of the battery. The battery core group includes a first battery core 101, a second battery core 102, a first adapter piece 103 and a second adapter piece 104. Through the arrangement of the first main tab 20 and the second main tab 30, the first battery The soft tabs of the core 101 and the second battery core 102 are welded to the main tabs through corresponding connecting pieces without direct welding. The soft tabs of multiple battery cells that need to be core-joined can be core-joined by welding to the main tabs separately, which provides more possibilities for increasing the capacity of the battery core, which in turn can improve the endurance of the power battery.

It should be understood that in some embodiments, the structure of the first adapter piece 103 is the same as the structure of the second adapter piece 104, and the structure of the first main tab 20 is the same as the structure of the second main tab 30. By The above settings reduce the difficulty of battery processing and improve the versatility of the adapter piece and main tab.

Optionally, please refer to FIG. 3 . In some embodiments, the first end and the second end of the first main tab 20 are arranged at an angle, and the first end and the second end of the second main tab 30 are arranged at an angle. The two ends are set at an angle.

It should be understood that the first end and the second end of the first main tab 20 are arranged at an included angle, and the size of the angle between the first end and the second end of the first main tab 20 is not specified here. limited. For example, in some embodiments, the first end and the second end of the first main tab 20 are arranged vertically. In other embodiments, the angle between the first end and the second end of the first main tab 20 ranges from 85° to 95°.

It should be understood that the first end and the second end of the second main tab 30 are arranged at an included angle, and the size of the angle between the first end and the second end of the second main tab 30 is not specified here. limited. For example, in some embodiments, the first end and the second end of the second main tab 30 are arranged vertically. In other embodiments, the angle between the first end and the second end of the second main tab 30 ranges from 85° to 95°.

In the embodiment of the present application, the first end and the second end of the first main tab 20 are arranged at an included angle, and the first end and the second end of the second main tab 30 are arranged at an included angle. Through the above arrangement, the processing difficulty of the main tab is reduced. The L-shaped arrangement of the main tab can simplify the welding process, improve the welding reliability, and at the same time reduce the difficulty of welding the main tab and the adapter piece.

Optionally, in some embodiments, the first adapter piece 103 includes a first side and a second side arranged oppositely, and the first side of the first adapter piece 103 faces the first battery core. The main body 1011 and the second battery core body 1021 are disposed and electrically connected to the first soft tab 1012 and the third soft tab 1022. The second side of the first adapter piece 103 is connected to the first The main pole lug 20 is conductively connected;

The second adapter piece 104 includes a first side and a second side arranged oppositely, and the first side of the second adapter piece 104 is disposed toward the first cell body 1011 and the second cell body 1021 , and is conductively connected to the second soft tab 1013 and the fourth soft tab 1023 , and the second side of the second adapter piece 104 is conductively connected to the second main tab 30 .

Please refer to Figure 1. As shown in Figure 1, the first adapter piece 103 and the second adapter piece 104 each include a first side and a second side arranged oppositely, wherein the first adapter piece 103 and the second adapter piece 103 The first side of the connecting piece 104 is the side facing the first cell body 1011 and the second cell body 1021 .

The first side of the first adapter piece 103 is conductively connected to the first soft tab 1012 and the third soft tab 1022. The two side surfaces are conductively connected to the first main tab 20, so that the first soft tab 1012 and the third soft tab 1022 are located between the first adapter piece 103 and the first battery body 1011 and the second battery body 1021. between.

The first side of the second adapter piece 104 is electrically connected to the second soft tab 1013 and the fourth soft tab 1023, and the second side is electrically connected to the second main tab 30. In this way, the second soft tab 1013 and the fourth soft tab 1023 are electrically connected. The four soft pole tabs 1023 are located between the second adapter piece 104 and the first and second battery cell bodies 1011 and 1021 .

In this embodiment of the present application, the adapter piece includes a first side and a second side arranged oppositely, and the first side of the adapter piece is disposed toward the first battery cell body 1011 and the second battery cell body 1021 . Through the above arrangement, placing the soft pole tabs between the adapter piece and the first battery cell body 1011 and the second battery cell body 1021 can play a certain protective role for the soft pole tabs and extend the service life of the battery cells.

Optionally, in some embodiments, the first adapter piece 103 is arranged closely with the first soft pole tab 1012 and the third soft pole tab 1022, and the second adapter piece 104 is arranged with the first soft pole tab 1012 and the third soft pole tab 1022. The second soft pole tab 1013 and the fourth soft pole tab 1023 are arranged in close contact with each other.

It should be understood that the first adapter piece 103 and the first soft tab 1012 and the third soft tab 1022 can be bonded together by welding, hot pressing or bonding. This application describes the specific manner of bonding arrangement. No limitation is made here. In specific implementation, in order to reduce the difficulty of welding, the vertical projections of the first soft tab 1012 and the third soft tab 1022 on the first connecting piece do not overlap.

It should be understood that the second adapter piece 104 and the second soft tab 1013 and the fourth soft tab 1023 can be bonded together by welding, hot pressing or gluing, etc. The specific method of bonding arrangement is discussed in this application. No limitation is made here. In specific implementation, in order to reduce the difficulty of welding, the vertical projections of the second soft pole tab 1013 and the fourth soft pole tab 1023 on the second adapter piece 104 do not overlap.

In the embodiment of the present application, the first adapter piece 103 is arranged in close contact with the first soft pole tab 1012 and the third soft pole tab 1022. Through the above arrangement, the first adapter piece 103 and the first soft pole tab 1012 can be added. and the connection area of the third soft pole tab 1022, thereby improving the connection stability between the first soft pole tab 1012 and the first soft pole tab 1012 and the third soft pole tab 1022. The second adapter piece 104 is arranged in close contact with the second soft pole tab 1013 and the fourth soft pole tab 1023 . Through the above arrangement, the connection area between the second adapter piece 104 and the second soft pole tab 1013 and the fourth soft pole tab 1023 can be increased, thereby increasing the connection area between the second adapter piece 104 and the second soft pole tab 1013 and the fourth soft pole. Ear 1023 connection stability.

Optionally, in some embodiments, the first soft pole tab 1012 and the second soft pole tab 1013 are arranged close to the first battery core body 1011, and the third soft pole tab 1022 and the The fourth soft pole tab 1023 is arranged in close contact with the second battery core body 1021 .

In some embodiments, the first soft pole tab 1012 and the second soft pole tab 1013 are arranged in close contact with the first battery cell body 1011, and the first soft pole tab 1012 is arranged in close contact with the first adapter piece 103, and the second soft pole tab 1012 is arranged in close contact with the first adapter piece 103. The tab 1013 is arranged in close contact with the second adapter piece 104 . In the same way, the third soft pole tab 1022 and the fourth soft pole tab 1023 are arranged in close contact with the second battery core body 1021, and the third soft pole tab 1022 is arranged in close contact with the first adapter piece 103. The fourth soft pole tab 1023 It is arranged closely with the second adapter piece 104 .

In order to facilitate understanding, the following will take the battery shown in Figure 2 as an example to illustrate the structure of the battery. As shown in Figures 2 and 7, the first soft tab 1012 is formed by welding multiple layers of soft tabs. It can be considered that the first soft tab 1012 includes an integrally formed first fitting part and a first welding part, where , the first bonding part is bonded to the first battery core body 1011, and the first welding part is bonded and connected to the first adapter piece 103 through the first bonding part and the first battery core body 1011.

The second soft tab 1013 is formed by welding multiple layers of soft tabs. It can be considered that the second soft tab 1013 includes an integrally formed second bonding part and a second welding part, where the second bonding part and the first welding part The battery core body 1011 is arranged in a bonded manner. The second welding portion is bonded and connected to the second adapter piece 104 and then is bonded and connected to the first battery core body 1011 through the second bonding portion.

The third soft tab 1022 is formed by welding multiple layers of soft tabs. It can be considered that the third soft tab 1022 includes an integrally formed third fitting part and a third welding part, where the third fitting part and the second The battery core body 1021 is attached and arranged. The third welding part is attached to the first adapter piece 103 and then connected to the second battery core body 1021 through the third attachment part.

The fourth soft tab 1023 is formed by welding multiple layers of soft tabs. It can be considered that the fourth soft tab 1023 includes an integrally formed fourth bonding part and a fourth welding part, where the fourth bonding part and the second The battery core body 1021 is arranged in a bonded manner. The fourth welding part is bonded and connected to the second adapter piece 104 and then is bonded and connected to the second battery core body 1021 through the fourth bonding part.

In the embodiment of the present application, the first soft pole tab 1012 and the second soft pole tab 1013 are arranged to fit the first battery core body 1011, and the third soft pole tab 1022 and the fourth soft pole tab 1023 fit to the second battery core body. 1021 settings. Through the above arrangement, the height of the battery can be reduced and the space utilization of the battery in the height direction can be improved.

Optionally, in some embodiments, the first adapter piece 103 includes a first connection area 1031 and a second connection area 1032 arranged at intervals, and the first connection area 1031 is used to connect with the first soft pole. The ear 1012 is conductively connected, and the second connection area 1032 is used for conductive connection with the third soft pole ear 1022;

The second adapter piece 104 includes a third connection area and a fourth connection area arranged at intervals. The third connection area is used for conductive connection with the second soft tab 1013, and the fourth connection area is used for conductive connection with the second soft tab 1013. It is conductively connected to the fourth soft tab 1023 .

See Figure 4. Taking the first adapter sheet 103 as an example, the first adapter sheet 103 includes a first connection area 1031 and a second connection area 1032, where the first connection area 1031 and the second connection area 1032 are spaced apart. For convenience of description, the portion used to connect the first connection area 1031 and the second connection area 1032 may also be called a spacer area 1033.

In some embodiments, the first connection area 1031, the spacing area 1033 and the second connection area 1032 are integrally formed. In other embodiments, the first connection area 1031, the spacer area 1033 and the second connection area 1032 are connected in sequence. For the structure of the second adapter plate 104, reference can be made to the description of the first adapter plate 103. In order to avoid repetition, it will not be described again here.

Through the above arrangement, the first soft pole tab 1012 and the third soft pole tab 1022 do not overlap, and the second soft pole tab 1013 and the fourth soft pole tab 1023 do not overlap, thereby reducing the difficulty of welding.

Optionally, in some embodiments, there is a gap between the first connection area 1031 and the second connection area 1032 A first through hole 1034; a second through hole is provided between the third connection area and the fourth connection area.

It should be understood that the number and shape of the first through holes 1034 and the second through holes are not limited here. Illustratively, taking the first through holes 1034 as an example, see FIG. 5 , in some embodiments, the number of the first through holes 1034 is multiple, the shape is circular, and the multiple first through holes 1034 are arranged at intervals. In other embodiments, the first through hole 1034 may be a single rectangular through hole. In other embodiments, the first through hole 1034 is at least one irregular through hole.

In the embodiment of the present application, a first through hole 1034 is provided between the first connection area 1031 and the second connection area 1032; a second through hole is provided between the third connection area and the fourth connection area. Through the arrangement of the first through hole 1034 and the second through hole, the weight of the first adapter piece 103 and the second adapter piece is reduced, thereby reducing the weight of the battery.

Optionally, in some embodiments, please refer to Figures 2 and 3. The first main tab 20 includes a first metal sheet 201 and a first insulating glue 202. The first metal sheet 201 is attached with The first insulating glue 202; the second main tab 30 includes a second metal piece 301 and a second insulating glue 302, and the second insulating glue 302 is attached to the second metal piece 301.

Specifically, the first insulating glue 202 includes a first part and a second part. The first part is attached to the first side of the first metal sheet 201 , and the length of the first part along the first direction is greater than the length of the first metal sheet 201 along the first direction. The length of the second part is attached to the second side of the first metal sheet 201, and the length of the second part along the first direction is greater than the length of the first metal sheet 201 along the first direction, and the first direction is the first battery core. The length direction of the body 1011.

Referring to Figures 2 and 3, the first part and the second part are arranged oppositely, wherein the part of the first part located outside the first side is bonded to the part of the second part located outside the second side, thereby improving the connection between the first insulating glue 202 and The connection stability of the first metal piece 201.

Specifically, the second insulating glue 302 includes a third part and a fourth part. The third part is attached to the first side of the second metal sheet 301 , and the length of the third part along the first direction is longer than that of the second metal sheet 301 . The length in the first direction; the fourth part is attached to the second side of the second metal sheet 301, and the length of the fourth part along the first direction is greater than the length of the second metal sheet 301 along the first direction. Referring to FIG. 2 , the length direction of the first battery cell body 1011 can also be understood as the width direction of the first metal sheet 201 and the second metal sheet 301 .

Please refer to Figure 2 and Figure 3. The third part and the fourth part are arranged oppositely, wherein the part of the third part located outside the first side is bonded with the part of the fourth part located outside the second side, thereby improving the efficiency of the second insulating glue. The connection stability between 302 and the second metal piece 301.

During the process of packaging the battery pack, the aluminum-plastic film 40 is welded to the first insulating glue 202 and the second insulating glue 302, which can reduce the direct contact between the aluminum-plastic film 40 and the first main tab 20 and the second main tab 30. The probability that contact will cause a short circuit in the battery.

Optionally, as shown in FIG. 12 , in some embodiments, the battery core group further includes a first sticker 50 and a second sticker 60 , and the first sticker 50 is attached to the first adapter sheet 103 Far away from the first battery cell body 1011 The second sticker 60 is attached to the side of the second adapter piece 104 away from the first battery cell body 1011 .

It should be understood that during specific implementation, the side of the first adapter sheet 103 away from the first cell body 1011 can be understood as the side where the first adapter sheet 103 comes into contact with the aluminum-plastic film 40 during the cell packaging process. side. The side of the second adapter piece 104 away from the first cell body 1011 can be understood as the side where the second adapter piece 104 comes into contact with the aluminum-plastic film 40 during the cell packaging process.

In the embodiment of the present application, the battery core also includes a first sticker 50 and a second sticker 60. The first sticker 50 is affixed on the side of the first adapter piece 103 away from the first battery core body 1011. The second sticker 60 is affixed on On the side of the second adapter piece 104 away from the first cell body 1011 . Through the above arrangement, there is no direct contact between the aluminum-plastic film 40 and the first adapter piece 103 and the second adapter piece 104 , further reducing the probability of damage to the aluminum-plastic film 40 and improving the safety of the battery.

Optionally, in some embodiments, the first adapter piece 103 is welded and fixed to the first soft tab 1012 and the third soft tab 1022 and is formed with a first soldering area. The two adapter pieces 104 are welded and fixed to the second soft pole tab 1013 and the fourth soft pole tab 1023 and form a second soldering area.

The battery pack also includes a first sticker 50 and a second sticker 60. The first sticker 50 is affixed to the side of the first adapter piece 103 away from the first battery body 1011 and covers the first sticker. A soldering area, the second sticker 60 is attached to the side of the second adapter sheet 104 away from the first cell body 1011 and covers the second soldering area.

In the embodiment of the present application, through the arrangement of the first sticker and the second sticker, the probability of direct contact between the aluminum plastic film 40 and the first soldering area and the second soldering area is reduced during the process of packaging the battery core. , reducing the probability that burrs on the first soldering area and the second soldering area penetrate the aluminum-plastic film 40 .

Optionally, in some embodiments, please refer to Figure 6, the first battery core 101 includes a plurality of first sub-cells 1014, and the first sub-cells 1014 include a first sub-cell body, a first Sub-soft pole tabs and second sub-soft pole tabs, a plurality of first sub-battery core bodies are stacked to form the first battery core body 1011, and a plurality of first sub-soft poles of the first sub-battery cores 1014 The lugs are stacked and welded to form the first soft tabs 1012 , and the second soft tabs of a plurality of first sub-cells 1014 are stacked and welded to form the second soft tabs 1013 .

The second battery core 102 includes a plurality of second sub-battery cores 1024. The second sub-battery core 1024 includes a second sub-battery core body, a third sub-soft pole tab, and a fourth sub-soft pole tab. The second sub-battery core body is stacked to form the second battery core body 1021, and the third soft tabs of the plurality of second sub-battery cores 1024 are stacked and welded to form the third soft tab 1022, The fourth soft tabs of a plurality of first sub-cells 1014 are stacked and welded to form the fourth soft tabs 1023 .

See Figure 6, Figure 8a and Figure 8b. It should be noted that the number of first sub-cells 1014 and the number of second sub-cells 1024 may be the same or different. The number of layers or thickness of the soft tabs of each first sub-cell 1014 is not limited here, and the number of layers or thickness of the soft tabs of each second sub-cell 1024 is not limited here. In specific implementation, due to limitations of the welding process, the thickness of the soft tab that can be directly fixed by welding is limited.

As shown in Figure 9, the embodiment of the present application also provides a method for preparing a battery, which specifically includes the following steps:

Step 901: Prepare a first battery core and a second battery core. The first battery core includes a first battery core body, a first soft pole tab, and a second soft pole tab. The second battery core includes a second battery core. The main body, the third soft pole and the fourth soft pole.

It should be understood that the specific manner of preparing the first battery core and the second battery core is not limited here. Since the first battery core and the second battery core may be laminated battery cores or wound battery cores, the specific steps for preparing the first battery core and the second battery core depend on the different structures of the first battery core and the second battery core. The methods may also be different. For details, please refer to the description in related technologies, and will not be described in detail here.

Exemplarily, the first battery core is a wound battery core, which is formed by rolling a separator, a positive electrode sheet, and a negative electrode sheet. Multiple layers of first soft pole tabs and second soft poles extend from the edges of the positive electrode sheet and the negative electrode sheet. Ear. For preparation of the second battery cell, please refer to the first battery cell.

Step 902: Weld the first soft pole tab and the third soft pole tab to the first adapter piece respectively, and weld the second soft pole tab and the fourth soft pole tab to the second adapter piece respectively. Tab welding.

Optionally, please refer to Figure 10. In some embodiments, before step 902, the above method further includes:

Place the first battery core and the second battery core on the platform, so that the first side of the first battery core body is in contact with the platform, and the first side of the second battery core body is in contact with the platform. fit;

Press the first soft pole tab and the second soft pole tab close to the first side of the first cell body, and press the third soft pole tab and the fourth soft pole tab close to the first side of the battery core body. The first side of the second battery cell body;

The first adapter piece is placed on the platform and corresponds to the first soft pole tab and the third soft pole tab, and the second adapter piece is placed on the platform and corresponds to the second soft pole tab. The soft pole corresponds to the fourth soft pole.

In some embodiments, placing the first soft tab close to the first side of the first cell body can pre-weld together multiple layers of soft tabs through ultrasonic waves. Corresponding pre-soldering operations may be performed on the second soft pole tab, the third soft pole tab and the fourth soft pole tab.

Exemplarily, the first soft tab is placed close to the first side of the first cell body and placed in the first connection area of the first adapter piece, and the second soft tab is pressed close to the first cell body. The first side of the core body is placed on the third connection area of the second adapter piece. Press the third soft pole tab close to the first side of the second battery cell body and place it in the second connection area of the first adapter piece, press the fourth soft pole tab close to the second battery cell body the first side and placed on the fourth connection area of the second adapter piece.

The first soft pole tab and the third soft pole tab are opposite and spaced apart, and the second soft pole tab and the fourth soft pole tab are opposite and spaced apart.

Step 903: Fold the first battery core body to be stacked with the second battery core body to obtain a battery core group.

Optionally, please refer to Figure 11. In some embodiments, the above step 903 includes:

Fold the first battery core body so that the second side of the first battery core body is in contact with the second battery core body. The second side of the core body is arranged in close contact with each other to obtain a battery core set.

Through the above-mentioned folding, the first soft pole tab, the second soft pole tab, the third soft pole tab and the fourth soft pole tab are closely attached to the heads of the first cell body and the second cell body, and are located on the first The height space of the battery can be effectively reduced between the battery cell body, the second battery body and the first adapter piece and the second adapter piece.

Step 904: Weld the first adapter piece to the first end of the first main tab, and weld the second adapter piece to the first end of the second main tab.

It should be noted that the first main pole tab and the second main pole tab are prepared in advance, and the preparation process can be referred to the description in the related art, which is not limited here. The main tab includes a metal sheet and tab glue. Through the above arrangement, on the one hand, the reliability of tab welding can be improved, and on the other hand, the tab glue can be used to encapsulate the battery pack and the aluminum-plastic film.

Step 905: Use an aluminum-plastic film to encapsulate the battery core group so that the second end of the first main tab extends outside the aluminum-plastic film, and the second end of the second main tab extends outside the aluminum-plastic film. outside the aluminum plastic film.

The battery in the above embodiment can be prepared by the method as shown in Figure 9.

To facilitate understanding, a specific embodiment will be used as an example to illustrate the battery preparation process provided by the embodiments of the present application. See Figure 1-Figure 12. In this embodiment, the number of the first battery core 101 is one, and the number of the second battery core 102 is also one. First, the first battery core 101 and the second battery core 102 need to be prepared respectively. In specific implementation, the preparation process of the first battery core 101 and the second battery core 102 is the same. The following description will take the first battery cell 101 as an example.

Step 1: Battery core preparation. The separator, positive electrode sheet and negative electrode sheet are rolled to form a battery core. The edges of the wound positive electrode sheet and negative electrode sheet respectively extend with multiple layers of soft pole tabs. The multi-layer soft pole tabs are parallel to the length direction of the battery core body, and Extends outside the cell body. In some embodiments, as shown in Figures 8a and 8b, the separator, positive electrode sheet and negative electrode sheet can also be stacked to form a battery core. In this embodiment, a battery core formed by winding will be taken as an example for description.

Step 2: Pre-solder the multi-layer soft tabs as shown in Figure 7. Specifically, the multi-layer soft tabs of the positive electrode are pressed to one side and are closely connected together, and welded together by ultrasonic waves to form the first soft tab 1012. The multi-layer soft tabs of the negative electrode are pressed to one side and are closely connected to each other. Welded together to form the second soft tab 1013.

Step 3: Weld the adapter piece as shown in Figure 10. Specifically, the first battery core 101 and the second battery core 102 that have been pre-welded with multi-layer soft tabs are placed as shown in Figure 10, and the first soft tab 1012 and the third soft tab are 1022 is welded to the first adapter piece 103, and the second soft tab 1013 and the fourth soft tab 1023 are welded to the second adapter piece 104 to achieve thick battery core production. In a specific embodiment, the first adapter piece 103 and the second adapter piece 104 can be integrally connected with the positive and negative electrodes insulated from each other, or they can be separate. This example takes separate bodies as an example.

Step 4: Perform core joining process as shown in Figure 11. Specifically, the first battery core 101 and the second battery core 102 that have completed the adapter sheet welding are turned over and joined together as shown in Figure 11, so that the first battery core body 1011 and the second battery core body 1021 Cascading settings. Perform the core-joining process as shown in Figure 11 Finally, the soft tabs are bent and placed closely between the adapter piece and the battery core body, which can effectively reduce the height space of the battery core.

Step 5: Preparation of main tab. Specifically, the pre-prepared main tab is welded together with the corresponding adapter piece after the above-mentioned core-joining process to obtain the battery core structure as shown in Figure 2. The second ends of the first main tab and the second main tab 30 form the positive tab and the negative tab of the battery.

Step 6: Apply glue and encapsulate. Specifically, the first sticker 50 and the second sticker 60 are pasted on the battery core structure as shown in FIG. 2 to obtain the battery core group structure as shown in FIG. 12 . The protective tape at least covers the area where welding is performed during the preparation of the main tab to prevent the welding marks from being exposed. The battery core prepared above is packaged with an aluminum plastic film 40 as shown in Figure 12, thereby obtaining a battery. Among them, the thickness of the aluminum plastic film 40 used ranges from 153 μm to 300 μm.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, and all of them should be covered. within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A battery, characterized in that it includes:

Battery core group, the battery core group includes a first battery core, a second battery core, a first adapter piece and a second adapter piece, the first battery core includes a first battery core body, a first soft tab and a second soft pole tab; the second battery core includes a second battery core body, a third soft pole tab, and a fourth soft pole tab, and the second battery core body is stacked with the first battery core body; The first adapter piece is conductively connected to the first soft pole tab and the third soft pole tab; the second adapter piece is electrically conductive to the second soft pole tab and the fourth soft pole tab. connect;

A first main tab, the first end of the first main tab is conductively connected to the first adapter piece;

a second main tab, the first end of the second main tab is conductively connected to the second adapter piece;

Aluminum-plastic film, the aluminum-plastic film is used to seal the battery core group, and the second end of the first main tab and the second end of the second main tab extend outside the aluminum-plastic film.
The battery according to claim 1, wherein the first end and the second end of the first main tab are arranged at an angle, and the first end and the second end of the second main tab are arranged at an angle. corner settings.
The battery according to claim 1 or 2, wherein the first adapter piece includes a first side and a second side arranged oppositely, and the first side of the first adapter piece faces the third side. A battery core body and the second battery core body are arranged and conductively connected to the first soft pole tab and the third soft pole tab. The second side of the first adapter piece is connected to the first Main pole lug conductive connection;

The second adapter piece includes a first side and a second side arranged oppositely, the first side of the second adapter piece is arranged toward the first battery core body and the second battery core body, and It is conductively connected to the second soft pole tab and the fourth soft pole tab, and the second side of the second adapter piece is conductively connected to the second main pole tab.
The battery according to any one of claims 1 to 3, characterized in that the first adapter piece is arranged in close contact with the first soft tab and the third soft tab, and the second The adapter piece is arranged in close contact with the second soft pole tab and the fourth soft pole tab.
The battery according to claim 4, wherein the first soft pole tab and the second soft pole tab are arranged close to the first battery core body, and the third soft pole tab and the third soft pole tab are Four soft pole tabs are arranged to fit the second battery core body.
The battery according to any one of claims 1 to 5, characterized in that the first adapter piece includes a first connection area and a second connection area arranged at intervals, and the first connection area is used to connect with the The first soft pole The ear is conductively connected, and the second connection area is used for conductive connection with the third soft pole ear;

The second adapter piece includes a third connection area and a fourth connection area arranged at intervals, the third connection area is used for conductive connection with the second soft tab, and the fourth connection area is used with the The fourth soft pole ear is conductively connected.
The battery according to claim 6, wherein a first through hole is provided between the first connection area and the second connection area; and a first through hole is provided between the third connection area and the fourth connection area. Second through hole.
The battery according to any one of claims 1 to 7, wherein the first main tab includes a first metal sheet and a first insulating glue, and the first metal sheet is pasted with the first Insulating glue; the second main tab includes a second metal piece and a second insulating glue, and the second insulating glue is attached to the second metal piece.
The battery according to any one of claims 1 to 8, characterized in that the battery pack further includes a first sticker and a second sticker, and the first sticker is affixed away from the first adapter piece. On the side of the first battery core body, the second sticker is attached to the side of the second adapter piece away from the first battery core body.
The battery according to any one of claims 1 to 8, characterized in that the first adapter piece is welded and fixed to the first soft tab and the third soft tab and is formed with a first weld. The second transfer piece is welded and fixed to the second soft tab and the fourth soft tab to form a second welding area.
The battery according to claim 10, wherein the battery cell group further includes a first sticker and a second sticker, and the first sticker is affixed on the first adapter piece away from the first battery cell. The second sticker is attached to the side of the second adapter sheet away from the first cell body and covers the second soldering area.
The battery according to any one of claims 1 to 11, wherein the first cell includes a plurality of first sub-cells, and each first sub-cell in the plurality of first sub-cells The battery core includes a first sub-battery core body, a first sub-soft pole tab and a second sub-soft tab. A plurality of the first sub-battery core bodies are stacked to form the first battery core body. A plurality of the first sub-battery core bodies are stacked. The first sub-soft tabs of a sub-cell are stacked and welded to form the first soft tab, and the second sub-soft tabs of a plurality of first sub-cells are stacked and welded to form the second soft tab. extremely ear;

The second battery core includes a plurality of second sub-battery cores, and each second sub-battery core in the plurality of second sub-battery cores includes a second sub-battery core body, a third sub-soft tab and a fourth A plurality of second sub-battery core bodies are stacked to form the second battery core body, and a plurality of third sub-soft tabs of the second sub-battery core are stacked and welded to form the third sub-soft tab. Three soft pole tabs, a plurality of fourth sub-soft tabs of the first sub-cell are arranged in a stack and The fourth soft tab is formed by welding.